U.S. patent application number 10/545684 was filed with the patent office on 2006-06-22 for forward view apparatus for motor vehicles.
Invention is credited to Craig Hart MacDougall.
Application Number | 20060132940 10/545684 |
Document ID | / |
Family ID | 32872313 |
Filed Date | 2006-06-22 |
United States Patent
Application |
20060132940 |
Kind Code |
A1 |
MacDougall; Craig Hart |
June 22, 2006 |
Forward view apparatus for motor vehicles
Abstract
Forward view apparatus (10) for a motor vehicle, to enable the
driver of the vehicle to view an image of objects which are located
forward of the apparatus (10), includes a housing (12) in which a
rear view mirror (14) is located. A two-mirror arrangement (20, 24)
within the housing (12) provides an image of objects forward of the
assembly (10) in a viewing portal (16). The first mirror (20) is
planar and adjustable. A second mirror (24) is fixed and has a
curved reflecting surface. The reflecting surface of the fixed
mirror (24) is aspheric, spherical, substantially spherical,
parabolic or quasi-parabolic. A window (26) is provided on the
forward side of the housing (12), to enable light to pass to the
two-mirror arrangement (20, 24). A shutter means to limit light
reaching the apparatus (10) and means for removing water and other
material from the window (26) are also disclosed.
Inventors: |
MacDougall; Craig Hart;
(Moorabbin, Victoria, AU) |
Correspondence
Address: |
RICHARD M. GOLDBERG
25 EAST SALEM STREET
SUITE 419
HACKENSACK
NJ
07601
US
|
Family ID: |
32872313 |
Appl. No.: |
10/545684 |
Filed: |
February 12, 2004 |
PCT Filed: |
February 12, 2004 |
PCT NO: |
PCT/AU04/00155 |
371 Date: |
August 15, 2005 |
Current U.S.
Class: |
359/843 |
Current CPC
Class: |
B60R 1/10 20130101 |
Class at
Publication: |
359/843 |
International
Class: |
G02B 5/08 20060101
G02B005/08; G02B 7/18 20060101 G02B007/18 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 13, 2003 |
AU |
2003900638 |
Jul 4, 2003 |
AU |
2003903410 |
Dec 5, 2003 |
AU |
2003906716 |
Claims
1. Forward view apparatus for a motor vehicle, which apparatus
provides an image from a location forward of the apparatus, said
image being able to be viewed by a driver of said vehicle, said
apparatus comprising a two-mirror arrangement, and one of the
mirrors of said two-mirror arrangement has a curved surface.
2. Forward view apparatus according to claim 1, wherein said one of
the mirrors has a convex surface.
3. Forward view apparatus according to claim 1, wherein said one of
the mirrors has an aspheric surface.
4. Forward view apparatus according to claim 1, wherein the other
of the mirrors of said two-mirror arrangement has a substantially
planar surface.
5. Forward view apparatus according to claim 1, further comprising
a window and a viewing portal, and wherein light from a location
forward of the assembly passes through the window and is reflected
by said two-mirror arrangement through the viewing portal to eyes
of the driver of the vehicle, and said viewing portal is located on
an inboard side of said apparatus.
6. Forward view apparatus according to claim 5, wherein said
viewing portal is adapted to be viewed through a structure of said
vehicle, rather through a window of said vehicle.
7. Forward view apparatus according to claim 6, wherein an inboard
one of said mirrors is located within the structure of said
vehicle.
8. Forward view apparatus according to claim 7, wherein said
structure is one of a mounting plate and body portion between a
window a main portion of a door of said vehicle.
9. Forward view apparatus according to claim 8, wherein said portal
provides communication between an interior of said vehicle and an
interior of said apparatus, such that ambient temperature of the
interior of said vehicle influences temperature of the interior of
said apparatus.
10. Forward view apparatus according to claim 1, further comprising
a shutter adapted to move between a closed position and an open
position, such that in said closed position light is prevented from
reaching said apparatus, and in said open position light is able to
reach said apparatus.
11. Forward view apparatus according to claim 10, wherein movement
of said shutter is a sliding movement.
12. (canceled)
13. Forward view apparatus for a motor vehicle, which apparatus
provides an image from a location forward of the apparatus, said
image being able to be viewed by a driver of said vehicle, said
apparatus comprising a video camera and associated screen
arrangement.
14. Forward view apparatus according to claim 10, wherein said
shutter is actuated by a motor controlled from within a passenger
compartment of the vehicle.
15. Forward view apparatus according to claim 5, further comprising
an arrangement to produce, when said vehicle is in forward motion,
an air flow across said window for removal of water and other
material and the prevention of adhering of water and other material
to said window.
16. Forward view apparatus according to claim 15, wherein said
arrangement includes a construction to produce two intersecting air
flows.
17. Forward view apparatus according to claim 16, wherein said
construction employs a venturi effect in the production of an air
flow.
18. Forward view apparatus according to claim 15, wherein said
arrangement includes a first channel for directing air across said
window.
19. Forward view apparatus according to claim 18, wherein said
arrangement also includes a second channel utilising the venturi
effect to induce air to flow from an outer surface of said window,
such that the air flow produced by said first channel is
enhanced.
20. Forward view apparatus according to claim 19, wherein said
second channel is located generally on an outer side of said
apparatus, and air flow created by forward movement of said vehicle
is generally tangential to said second channel.
21. Forward view apparatus according to claim 15, further
comprising an additional cleaning arrangement to clean at least one
of: said window and at least one reflector.
22. Forward view apparatus according to claim 21, wherein said
additional cleaning arrangement includes at least one of: a wiper
of the type used as a windscreen wiper, and a device to apply a
fluid to the outer surface of said window.
23. Forward view apparatus according to claim 1, wherein at least
part of a foremost vehicle in front of a vehicle directly in front
of said vehicle on which said apparatus is located, includes at
least one of a stop light and a turn indicator.
24. Forward view apparatus according to claim 1, wherein a first
said mirror of said apparatus, which is adapted to receive light
from a foremost vehicle in front of a vehicle directly in front of
said vehicle on which said apparatus is located, and to direct said
light onto a second said mirror of said apparatus, is at an angle
of approximately 125.degree. to a plane which is approximately
90.degree. to a line from said second mirror to eyes of said
driver, and said second mirror is at an angle of approximately
40.degree. to said plane.
25. Forward view apparatus according to claim 24, wherein each of
said first mirror and said second mirror has a quadrilateral
shape.
26. Forward view apparatus according to claim 25, wherein said
quadrilateral shape is a quadrilateral with no one side being the
same length as any other side.
Description
[0001] This invention relates to forward viewing apparatus, and in
particular relates to forward-viewing apparatus for use on vehicles
such as motor vehicles.
[0002] It is said that a driver of a motor vehicle should, when
driving in a stream of traffic, always drive two or three cars
ahead. That expression means that a driver should look ahead to a
vehicle two or three vehicles in front of his or her own, so that
the driver may react to any change of direction, or more
importantly speed, of that vehicle, rather than wait for such a
change in the vehicle immediately in front of his or her own.
[0003] However, in the traffic mix these days in, for example,
Australian cities, it is becoming more and more difficult to drive
two or three vehicles ahead, because drivers often cannot see past
the vehicle immediately in front of his or her vehicle. Many
vehicles now have heavily tinted windows, which makes it difficult
or impossible to see through a car or station wagon to vehicles in
front of it. Furthermore, there are many more trucks, vans, and in
particular four wheel drive "recreational vehicles", which either
do not have any windows, or have heavily tinted windows, or simply
ride too high for a driver to see past them.
[0004] There have been some attempts to provide mechanisms for
forward-view mirrors, to enable a driver to see around such a
vehicle which is immediately in front of the driver's vehicle. U.S.
Pat. No. 4,685,779, apart from providing in the "Background of the
Invention" section of the specification a brief description of the
problem, and a useful summary of pre-1986 prior art, discloses a
complicated combined forward and rearward viewing mirror assembly,
having three mirrors in two body members, one of which members is
attached to the door of the vehicle, and the other one of the
members is coupled to the first body member by means of a
linkage.
[0005] U.S. Pat. No. 4,268,120 describes a forward-view mirror
arrangement adapted to be located on the opposite side of a vehicle
to the driver of that vehicle, such that "dead angles" may be
eliminated. FIG. 3 of U.S. Pat. No. 4,268,120 shows a two-mirror
arrangement for directing light entering a housing through a
transparent cover to the driver of the vehicle.
[0006] Despite the existence of conceptual forward-view mirrors, as
exemplified by U.S. Pat. No. 685,779 and U.S. Pat. No. 4,268,120,
current motor vehicles do not feature forward-view mirrors.
[0007] NMRA Insurance, an Australian insurance company, released,
on 31 Oct. 2002, a "World First Reversing Visibility Index", which
resulted from measurements of the visibility from the driver's seat
of a vehicle "out the back of a car". Many vehicles tested had
large blind spots behind the vehicle. In media coverage of the
Index, it was suggested that one way of overcoming a blind spot
problem was to install a video camera at the rear of a vehicle,
pointing rearwards, the camera being linked to a small LCD screen
located in the internal rear view mirror. However, the cost of such
an arrangement was suggested to be in the order of $1,500. Such a
figure would be in general applicable to a forward-view
arrangement, except that ideally two cameras, one on each side of
the vehicle, and two screens, would be required. That would double
the cost, making it prohibitive for most persons.
[0008] It is an object of this invention to provide an effective,
relatively simple, arrangement for providing forward viewing in a
motor vehicle.
[0009] The invention provides forward view apparatus for a motor
vehicle, which apparatus provides an image from a location forward
of the assembly, said image being able to be viewed by the driver
of said vehicle, characterised in that said apparatus includes a
two-mirror arrangement, and in that one of the mirrors of said
two-mirror arrangement has a curved surface.
[0010] The invention also provides forward view apparatus for a
motor vehicle, which apparatus provides an image from a location
forward of the assembly, said image being able to be viewed by the
driver of said vehicle, characterised in that light from a location
forward of the assembly passes through a window and is reflected by
said two-mirror arrangement through a viewing portal to the eyes of
the driver of the vehicle, and in that said viewing portal is
located on the inboard side of said arrangement.
[0011] The invention further provides forward view apparatus for a
motor vehicle, which apparatus provides an image from a location
forward of the assembly, said image being able to be viewed by the
driver of said vehicle, characterised in that there are shutter
means adapted to move between a closed position and an open
position, in that in said closed position light is prevented from
reaching said apparatus, and in that in said open position light is
able to reach said apparatus.
[0012] The invention also provides forward view apparatus for a
motor vehicle, which apparatus provides an image from a location
forward of the assembly, said image being able to be viewed by the
driver of said vehicle, characterised by an arrangement to produce,
when said vehicle is in forward motion, an air flow across said
window for removal of water and/or other material and/or the
prevention of the adhering of water and/or other material to said
window.
[0013] Embodiments of the invention, which may be preferred, will
be described in detail hereinafter with reference to the
accompanying drawings, in which:
[0014] FIG. 1 is a section through a first embodiment of a
forward-view assembly according to the present invention;
[0015] FIG. 2 is an end elevation of the assembly of FIG. 1;
[0016] FIG. 3 is a front elevation of the assembly of FIG. 1;
[0017] FIG. 4 is a rear elevation of the assembly of FIG. 1;
[0018] FIG. 5 is a section through a second embodiment of a
forward-view assembly according to the present invention;
[0019] FIG. 6 is a front elevation of the embodiment of FIG. 5;
[0020] FIG. 7 is a rear elevation of the assembly of FIG. 5;
[0021] FIG. 8 is a sectional view of a third embodiment of the
invention according to the present invention;
[0022] FIG. 9 is a front elevation of the arrangement of FIG.
8;
[0023] FIG. 10 is a rear elevation of the arrangement of FIG.
8;
[0024] FIG. 11 is an elevation of one exemplary window in
accordance with the present invention.
[0025] FIG. 12 is a rear elevation of a first embodiment of a
forward-view assembly according to the present invention;
[0026] FIG. 13 is a front elevation of the assembly of FIG. 12;
[0027] FIG. 14 is a section along the lines 14-14 of FIG. 1;
[0028] FIG. 15 is a rear elevation of a second embodiment of a
forward-view assembly according to the present invention;
[0029] FIG. 16 is a front elevation of the assembly of FIG. 15;
[0030] FIG. 17 is a section along the lines 17-17 of FIG. 16;
[0031] FIG. 18 is a rear elevation of a forward view assembly in
accordance with another embodiment of the present invention;
[0032] FIG. 19 is a section along the lines A-A of FIG. 18;
[0033] FIG. 20 is a side elevation of the assembly of FIG. 18;
[0034] FIG. 21 is a diagrammatic view, showing the angles between
two mirrors in the assembly of FIG. 18;
[0035] FIG. 22 is a plan view of one of the mirrors in the assembly
of FIG. 18;
[0036] FIG. 23 is a plan view of the other one of the mirrors of
FIG. 18; and
[0037] FIG. 24 is a front elevation of a further embodiment of a
rear view mirror assembly in accordance with the present
invention;
[0038] FIG. 25 is a side elevation of the assembly of FIG. 24;
and
[0039] FIG. 26 is a rear elevation of the assembly of FIGS. 24 and
25.
[0040] The drawings show a right hand side forward-view apparatus
10 according to the present invention adapted to be located on a
motor vehicle (not shown) in the position in which a conventional
rear-view mirror is located, although it must be understood that
the same assembly or a mirror-image (about a line from the front to
the rear of a vehicle) assembly may be provided in the left hand
position. It is also to be understood that the mirror assembly is
suitable for left hand drive vehicles as well as right hand drive
vehicles.
[0041] In the drawings, the right hand forward view apparatus 10
includes a housing 12 which may be generally similar to prior art
housings for rear view wing mirrors, such housings for rear view
mirror arrangements being normally formed from plastics material
and having a cup shape in which a rear view mirror 14 is
located.
[0042] Throughout this specification, it is to be understood that
the term "front" has the same meaning as the front of the vehicle
to which an assembly of the invention may be attached, and the term
"rear" has the same meaning as the rear of such a vehicle.
[0043] Preferably, the housing 12 is adapted to be attached to the
body of a right hand drive vehicle (not shown) just forward of the
driver's door, but may be located in any suitable position. The
housing 12 contains at its rear a first mirror or the like 14,
which is preferably a conventional rear-view mirror adapted to be
used by the driver of the vehicle to look towards the rear of the
vehicle. Of course, the image in that mirror is reversed.
[0044] Referring now specifically to FIGS. 1 to 4, it should be
noted that the section of FIG. 1 is along the lines A-A of FIG. 4.
In this embodiment, the mirror arrangement 10 is preferably mounted
on a pivoting breakaway point. The arrangement 10 is a separate,
self-contained unit which is spaced form the vehicle, allowing the
airflow created by the motion of the vehicle to pass between the
car and the arrangement.
[0045] In the first embodiment of the present invention, there is a
forward viewing area 16 in which the driver may see a forward-view
image when he or she is desirous of looking forward, past a vehicle
immediately in front of the vehicle he or she is driving, to a
vehicle forward of that vehicle immediately in front of the
driver's vehicle. Preferably, the portal 16 is an opening, through
which the driver may see light which has passed from the front of
the vehicle through the assembly 10.
[0046] In this embodiment, the forward viewing portal 16 is located
at the side of the housing 12 of the arrangement 10, with the
viewing line passing behind the rear view mirror 14 and in front of
the pivotal mounting point (not shown) for the arrangement 10.
[0047] In FIG. 1, rear view mirror 14 is adjusted by means of a
motor 18, in a conventional manner. The forward view mirror
arrangement of the embodiment of FIGS. 1 to 4 includes a first
mirror 20. The first mirror 20 is preferably planar, and is also
preferably adjustable, manually or by use of a motor 22, which may
be in an offset position. A second mirror 24 is located within
housing 12. Second mirror 24 is preferably fixed, that is,
non-adjustable, and is also preferably curved. More preferably, the
mirror 24 is aspheric, spherical, substantially spherical,
parabolic or quasi-parabolic. However, the curvature of mirror 24
could take any form. For example, the mirror 24 may have a convex
lower portion, and a substantially planar upper portion, or such an
arrangement could be a side-to-side arrangement.
[0048] A window 26 is provided on housing 12, for light to reach
the forward view mirror arrangement. The window 26 is clear, is
preferably a sealed clear window, and is preferably formed from
glass or acrylic material. The shape of the window 26 preferably
follows the curvature of the front of housing 12, but to maximise
the forward view and to assist in the repelling of water from the
surface of the window, the window 26 is preferably outwardly curved
or convex, and is also preferably located towards the outer
perimeter of the housing 12. A venturi and vortex arrangement 28,
as described in related applications, may also be included to aid
in keeping the window 26 clear of water and debris.
[0049] Light from the front of the vehicle to which the arrangement
10 is attached initially strikes fixed mirror 24, is reflected to
adjustable mirror 20 and is again reflected through forward viewing
portal 16 to the eye of the driver of the vehicle. In the
embodiment of FIGS. 1 to 4, the arrangement 10 is preferably only
be used for viewing through the driver's window, or the passenger's
window for the opposite side of the vehicle to that of the
driver.
[0050] In FIGS. 5 to 7, a second embodiment of the invention is
shown. The section of FIG. 5 is along the lines A-A of FIG. 6. In
this embodiment, a forward view assembly 110 has a housing (similar
generally to housing 12 of FIGS. 1 to 4) is preferably integrated
with the body (the triangular door/window mounting plate of which
is shown at 130) of a vehicle to which the arrangement is attached.
Thus, air cannot pass between the arrangement 110 and the vehicle,
unlike the situation described in relation to FIGS. 1 to 4.
[0051] Arrangement 110 has a conventional rear view mirror 114,
adjustable in a conventional manner by a motor 118. A forward view
portal 116 is located in the side of the housing 112. A first,
inboard, mirror 120 is located in housing 112, but preferably
extends beyond the housing as shown in FIG. 5. The first mirror 120
is preferably planar, and is also preferably adjustable, manually,
or by use of a motor 122.
[0052] A second mirror 124 is located within housing 112. Second
mirror 124 is preferably fixed, that is, non-adjustable, and is
also preferably curved. More preferably, the mirror 124 is
aspheric, spherical or substantially spherical, parabolic or
quasi-parabolic. However, the curvature of mirror 124 could take
any form. For example, the mirror 124 may have a convex lower
portion, and a substantially planar upper portion, or such an
arrangement could be a side-to-side arrangement.
[0053] A window 126 is provided on housing 112, for light to reach
the forward view mirror arrangement. The window 126 is clear, is
preferably a sealed clear window, and is preferably formed from
glass or acrylic material. The window 126, in this embodiment, is
more centrally located on housing 112, as shown in FIG. 6. This
allows for peripheral indicators (not shown) to be accommodated on
the housing 112, and for more centralised mounting of the motor
122.
[0054] The shape of the window 126 preferably follows the curvature
of the front of housing 112, but to maximise the forward view and
to assist in the repelling of water from the surface of the window,
the window 126 is preferably outwardly curved or convex, and is
also preferably located towards the outer perimeter of the housing
112. A venturi and vortex arrangement 128, as described in relation
to FIGS. 1 to 4, may also be included to aid in keeping the window
126 clear of water and debris.
[0055] Light from the front of the vehicle to which the arrangement
110 is attached initially strikes fixed mirror 124, is reflected to
adjustable mirror 120 and is again reflected through forward
viewing portal or area 116 to the eye of the driver of the vehicle.
In the embodiment of FIGS. 5 to 7, the arrangement 110 is
preferably only be used for viewing through the driver's window, or
the passenger's window for the opposite side of the vehicle to that
of the driver.
[0056] The third embodiment of the present invention is shown in
FIGS. 8 to 10. The section of FIG. 8 is along the lines A-A of FIG.
9. In this embodiment, a forward view assembly 210 has a housing
(similar generally to housing 12 of FIGS. 1 to 4) is preferably
integrated with the body (the triangular door/window mounting plate
of which is shown at 230) of a vehicle to which the arrangement is
attached, in a similar manner to the embodiment of FIGS. 5 to 7.
Thus, again, air cannot pass between the arrangement 210 and the
vehicle, unlike the situation described in relation to FIGS. 1 to
4.
[0057] Arrangement 210 has a conventional rear view mirror 214,
preferably adjustable in a conventional manner by a motor 218. A
forward view portal 216 is located in the housing 212 on the
inboard side of mirror 214. A first, inboard, mirror 220 is located
in dor/window mounting plate or bracket 230 (FIG. 8). The first
mirror 220 is preferably planar, and is also preferably adjustable,
manually, or by use of a motor 222. A pivot point 232 aft of the
mirror 220 and motor 222 allows the arrangement 210 to fall back
against the body of the vehicle, rearwards of the mounting plate
230, if it is hit, or for parking. The housing 212 of the
arrangement 210 separates from the mounting plate 230 along a
breakaway line 234 outboard of the mirror 220. The extended flange
on the window is adapted to engage with an imbedded O ring (not
shown) for sealing when the housing 212 returns to its operational
position. Movement of the housing 212 about pivot point 232 may be
effected manually or by using a motor or the like (not shown).
[0058] The viewing portal, in the embodiment of FIGS. 8 to 10,
facilitates viewing through the mounting plate 230, that is,
through the door rather than through the vehicle window as in the
other embodiments.
[0059] A second mirror 224 is located within housing 212. Second
mirror 224 is preferably fixed, that is, non-adjustable, and is
also preferably curved. More preferably, the mirror 224 is
aspheric, spherical, substantially spherical, parabolic or
quasi-parabolic. However, the curvature of mirror 224 could take
any form. For example, the mirror 224 may have a convex lower
portion, and a substantially planar upper portion, or such an
arrangement could be a side-to-side arrangement.
[0060] A window 226 is provided on housing 212, for light to reach
the forward view mirror arrangement. The window 226 is clear, is
preferably a sealed clear window, and is preferably formed from
glass or acrylic material. The shape of the window 226 preferably
follows the curvature of the front of housing 212, but to maximise
the forward view and to assist in the repelling of water from the
surface of the window, the window 226 is preferably outwardly
curved or convex, and is also preferably located towards the inner
perimeter of the housing 212. A venturi and vortex arrangement, as
described in related applications, may also be included to aid in
keeping the window 226 clear of water and debris.
[0061] Light from the front of the vehicle to which the arrangement
210 is attached initially strikes fixed mirror 224, is reflected to
adjustable mirror 220 and is again reflected through forward
viewing portal 216 to the eye of the driver of the vehicle.
[0062] As described hereinbefore, the viewing portal 226 is
preferably located within mounting plate 230. Such an arrangement
facilitates a method of viewing the forward view mirror arrangement
210 from within the vehicle. The benefits of this feature are
twofold. Firstly, a delineated boundary is created between the rear
view mirror 214 and the forward view mirror 220, when the driver
looks into the arrangement 210. Secondly, because the portal 216 is
in communication both with the interior of the arrangement 210 and
that of the vehicle, the mirrors 220 and 224 are less likely to fog
up, as the interior of the arrangement is kept at or near the
ambient temperature of the interior of the vehicle, thus cleaning
or demisting the mirrors.
[0063] Mounting of the rear view mirror motor 218 may be central in
the arrangement 210, or may be as it is in conventional rear view
mirrors. The adjustable mirror 220 and associated motor 222, being
located within mounting plate 230, in the door of the vehicle, and
being located somewhat further forward, may facilitate improved
viewing, particularly on the driver's side. It is believed that the
actual size of the wing mirrors (housings 212 of arrangement 210)
would be in general no larger than existing wing mirrors. The
peripheral indicators, mentioned hereinbefore, may be accommodated
within housing 212 with minimal modification. The mirror 224 may be
moved outboard from the position shown in FIG. 8, if no indicator
is required, which would facilitate a slightly improved view. Both
driver's side and passenger side portals (216 and not shown) are
readily visible without the need to look through the side
windows.
[0064] As far as the configuration of the mirrors 20, 120, 220, 24,
124 and 224 is concerned, the major problem involved visibility
through the left and right viewing portals 16, 116, 216. By moving
the mirror 20/120/220 and the associated motor 24/214/224 forward
(which is more readily achieved when those components are built
into the door, as in arrangement 210) the angle of the mirror
20/120/220 may be set at approximately right angles to the vehicle.
Preferably, the mirror 20/120/220 is tilted back approximately
5.degree., and mirror 24/124/224 is set at an angle of
approximately 50.degree. to approximately 60.degree. to the
vehicle. Where mirror 24/124/224 is aspheric, a greatly enhanced
view of the front wheel of the vehicle, along the side of the
bonnet of the vehicle, and approximately 200 metres ahead may be
achieved on the passenger side. On the driver's side, by rotating
mirror 20/120/220 approximately 10.degree., and by tilting mirror
20/120/220 back approximately 5.degree., a similar result is
achieved.
[0065] It has been found that a parabolic mirror, used as a mirror
24/124/224, was not very satisfactory, as it was felt that its
curvature was too great, providing as a result too much of a
peripheral view to the left and the right. It is felt that an
aspheric mirror, flatter in profile that a parabolic mirror,
addressing both distance and the positioning of the front wheel of
the vehicle, would be more desirable.
[0066] Turning now to the windows 26, 126, 226, FIG. 11 shows a
preferred shape for such a window. The window 26 illustrated is
exemplary of a window for a driver's side arrangement 10 for a
right hand drive vehicle, and a mirror-image may be used for the
passenger side of such a vehicle. Although the window is shown as
226, it could be a window 26 or 126. In all three embodiments, the
window 26/126/226 is preferably curved or convex to follow the
normal shape of a wing mirror arrangement, in an endeavour to
minimise water retention. The viewing glass or acrylic window
26/126/226 is preferably sealed and airtight, that is, as far as
allowing water, debris and so on into the interior of arrangement
10/110/210. The position and angle of the arrangement 10/110/210
means that water and road grime will be deflected off the
windscreen of the vehicle and across the front surface of the
viewing window 26/126/226. To counteract this and to facilitate
clean viewing through the window 26/126/226, a concave surface
portion 34 (FIG. 1) inboard of the window 26, is provided. Surface
portion 34, together with a protrusion or wing 36, located between
the window 26 and the surface area 34, comprises a system which
gathers and disperses water, debris and so on. Any water, road
grime and the like which does land on the surface of window 26 is
moved sideways and across the window 26 by the venturi vortex 28
described in earlier associated applications. Although the features
34 and 36 have been described in relation to the embodiment of
FIGS. 1 to 4, it is to be understood that they are equally
applicable to the embodiments of FIGS. 5 to 7 and 8 to 10.
[0067] As has been stated, a similar unit may (in the case of a
right hand drive vehicle) be located on the left hand side of the
vehicle, to look forward along the left side of the vehicle.
Preferably, both assemblies 10, 110, 210, would have mirror
adjustments by electric motors, operable from a position
conveniently close to the driver. Alternatively, adjustments may be
made manually. Such an alternative is particularly suited to
arrangement 220, where a manual adjusting means could be located
within reach of the driver/passenger.
[0068] Features described in relation to one of the three
aforementioned described embodiments of the present invention
should be taken to relate to the other two embodiments.
[0069] With regard to FIG. 3, by increasing the internal mirror
size by approximately 20 mm horizontally, no motor is needed to
adjust the adjustable mirror for the different sizes of drivers.
Theis means that the mirror may be fixed in one position. The only
movement necessary could be achieved manually when changing from
right to left hand drive vehicles, and that could be set in the
factory.
[0070] Viewing the forward view assembly from inside a vehicle and
not through the driver's side window creates far greater
differentiation and greater user friendliness. It also means that
the inboard and outboard mirrors may be heated form within the
vehicle. This negates the need for designated heating within the
assembly housing.
[0071] FIGS. 12 to 17 show another embodiment of forward view
apparatus according to the present invention. The apparatus 310 is
of the type denoted in earlier drawings figures by reference
numerals 10, 110 and 210. The apparatus 310 has a housing 312 which
may be adapted to be attached to the body of a right hand drive
vehicle (not shown) just forward of the driver's door, but may be
located in any suitable position. In FIGS. 12 to 14, the housing
312 includes a binnacle 316 which in use may be located along the
line of the bodywork of the vehicle, to provide a forward view
viewing portal 318 inside the passenger compartment of the vehicle.
Of course, the viewing portal may be located anywhere which may be
conveniently viewed by the driver of the vehicle.
[0072] Referring now specifically to FIGS. 12 to 14, it should be
noted that the section of FIG. 14 is along the lines 14-14 of FIG.
13. In this embodiment, the mirror arrangement 10 is preferably
mounted on a pivoting breakaway point 320 (FIG. 14). The broken
line in FIG. 14 is the "break-away" line where the outer portion of
housing 312 breaks away from the remainder as it pivots around
point 320.
[0073] In the embodiment of FIGS. 12 to 14, the forward viewing
portal 318 allows the driver to see a forward-view image when he or
she is desirous of looking forward, past a vehicle immediately in
front of the vehicle he or she is driving, to a vehicle forward of
that vehicle immediately in front of the driver's vehicle.
Preferably, the portal 318 is an opening, through which the driver
may see light which has passed from the front of the vehicle
through the assembly 310.
[0074] In this embodiment, the forward viewing portal 318 is
located at the side of the housing 312 of the arrangement 310, with
the viewing line passing to one side of the rear view mirror 314
and in front of the pivotal mounting point 320 for the arrangement
310.
[0075] In FIG. 12, rear view mirror 314 is adjusted by means of a
motor 322, in a conventional manner. The forward view mirror
arrangement 310 of the embodiment of FIGS. 12 to 14 includes a
first mirror 324. The first mirror 324 is preferably planar, and is
also preferably adjustable, manually or by use of a motor 326,
which may or may not be in an offset position. A second mirror 328
is located within housing 312. Second mirror 328 is preferably
fixed, that is, non-adjustable, and is also preferably curved. More
preferably, the mirror 328 is aspheric, spherical, substantially
spherical, parabolic or quasi-parabolic. However, the curvature of
mirror 328 could take any form. For example, the mirror 328 may
have a convex lower portion, and a substantially planar upper
portion, or such an arrangement could be a side-to-side
arrangement.
[0076] A window 330 is provided on housing 312, for light to reach
the forward view mirror arrangement. The window 330 is clear, is
preferably a sealed clear window, and is preferably formed from
glass or acrylic material. The shape of the window 30 preferably
follows the curvature of the front of housing 312, but to maximise
the forward view and to assist in the repelling of water from the
surface of the window, the window 330 is preferably outwardly
curved or convex, and is also preferably located towards the outer
perimeter of the housing 312.
[0077] Light from the front of the vehicle to which the arrangement
310 is attached initially strikes fixed mirror 328, is reflected to
adjustable mirror 324 and is again reflected through forward
viewing portal 318 to the eye of the driver of the vehicle. In the
embodiment of FIGS. 12 to 14, the arrangement 310 is preferably
only used for viewing through the driver's window, or the
passenger's window for the opposite side of the vehicle to that of
the driver.
[0078] Although previously proposed forward view arrangements
generally along the lines of the embodiment of FIGS. 12 to 14 have
been seen to have been an aid to enhance driver visibility, some
concerns have arisen. These concerns involve such aspects as user
friendliness, driver individuality, mistrust, problems with keeping
the assembly clean, and problems associated with glare from and
damage to the assembly. For example, it is possible that confusion
may occur when a driver looks into the mirror assembly, as to which
mirror, the rear view mirror or the forward view mirror, the driver
is looking at. In addition, to have a forward-view image constantly
visible through portal 318 may be distracting to a driver. It is
also possible that a driver may be dazzled by the lights of an
oncoming vehicle being reflected into his or her eyes through the
forward view apparatus. Finally, the front (exterior surface) of
window 30 may become opaque through a build-up of road dirt or the
like, lessening the quality of the forward view image, or even
rendering the apparatus useless if the build-up is allowed to
continue. Keeping the window 330 clean without wind deflectors,
vortex channels, small windscreen wipers or water jets has been an
ongoing difficulty.
[0079] In order to address these matters, the embodiment of FIGS.
12 to 14 includes a shutter 332 which is preferably adapted to
slide across window 330 to block light entering the window 330. A
motor 334 is adapted to actuate shutter 332, to move it between an
open and a closed position. The motor 334 may be generally similar
to motors 322 and 326.
[0080] The shutter 332 may slide on tracks (not shown), or may be
pivoted, depending on the mirror housing 312 profile. Movement
across the window 330 may be achieved through use of the electric
motor 334, which would engage gears (not shown) preferably moulded
into the shutter 332. Alternatively, a geared motor could operate
scissors (not shown) which could extend and retreat as the polarity
is reversed.
[0081] The shutter 332 may be fabricated from plastics material, or
of any other suitable lightweight material, and when in the closed
position would seal the window 332 against dirt, dust, rain and the
like. On opening and closing the shutter 332, a felt or rubber
wiper (not shown) which may be attached to the leading edge, would
move across the window removing any grime, rainwater and the
like.
[0082] The shutter 332 would be housed inboard, that is, the
shutter would move across the window 330 to reside in the vehicle's
door cavity or the mounting binnacle 316 of the housing 312. This
would accommodate the asymmetric profile of the mirror assembly
310.
[0083] In normal driving conditions, the shutters 332 of both left
and right assemblies 310 would be kept closed, avoiding the
aforementioned confusion, distraction or dazzling. In addition,
road dirt, stones, rain and the like are all deflected by the
shutters 332. The driver has a choice, dictated by road conditions,
driver preferences and the like, as to when he or she engages the
forward view mirror feature.
[0084] For a right-hand drive vehicle, to activate the shutter 332
of the left or right assembly 310, a switching mechanism (not
shown) is triggered by moving, for example, an indicator stalk,
similar to those used for turn indicators. This could be
pre-emptive to activating the indicator to signal a turn, and could
work in the same format as used in existing indicators, that is,
lifting the stalk up would open the shutter 332 of the left
assembly 310, and moving the stalk down would activate the shutter
332 in the right-hand assembly 310.
[0085] An over-ride button (not shown) on the stalk, dashboard or
elsewhere could keep one or both of the shutters 332 open,
permanently if desired, or a time delay facility such as a relay
switch may be provided to close the shutters 332 after a
predetermined period of time, for example one minute.
[0086] FIGS. 15 to 17 describe a further embodiment of the present
invention, with the forward view mirror assembly being designated
410. All reference numerals used in FIGS. 12 to 14, and also used
in FIGS. 15 to 17, show the same features. Features 324, 326 and
328 do not appear in FIGS. 15 to 17, and the section of FIG. 17 is
along the lines 17-17 of FIG. 16.
[0087] In this further embodiment, the mirror arrangement of FIGS.
12 to 14 is replaced by a video camera 336, and a screen 338 for
showing the image generated by the camera 336. The camera 336 is
situated to point forwards, and the circuitry or the like (not
shown) to connect it to the screen 338 (not shown) is conventional.
Screen 338 may preferably be an LCD screen, and although being
shown as visible through portal 18, it could be located across
portal 318. The camera/screen arrangement 336/338 could be
monochrome or black and white.
[0088] In every other aspect, the shutter 332 operates as described
in relation to FIGS. 12 to 14. In FIGS. 18 to 26, further
embodiments of the present invention are shown. A rear view
assembly 510 has a housing 512. A window 518 is located in the
front face of housing 512. Window 518, which may be generally
similar to transparent panel 8 of U.S. Pat. No. 4,268,120, permits
light from the front of the vehicle, to which the assembly 510 may
be attached, to pass through to the interior of the assembly 510.
The window 518 may be proud of, flush with or recessed in the front
surface of housing 512. It may be preferred for the window 518 to
be recessed, to co-operate with the air flow producing means to be
described later in this specification. The window may be formed
from glass, plastics material, or any suitable material which is
transparent or substantially transparent.
[0089] On the front and on the outer (in use) side of the housing
512 there are located means for directing air across the front of
window 518. This air flow will be described in greater detail
hereinafter in relation to FIG. 18, but the means includes channels
520 on the inner (in use) side of the rear of the housing 512.
These channels are of increasing depth, as the result of ribs 522
and 538 increasing in height, towards the outer side of the housing
512. In FIGS. 18 and 19 it can be seen that the channels 520 end at
a bulkhead 524, and that apertures 526 in that bulkhead 524 allow
communication between the channels 520 and the window 518.
[0090] FIGS. 18 and 19 show that the outer side of housing 512 is
provided with channels 528, which are generally similar to channels
520, being defined by ribs 530 and ending at a bulkhead 532,
through which apertures 534 allow communication between channels
528 and window 518.
[0091] In FIG. 18 there is also shown a further channel 536,
located at the base of the front side of housing 512. Channel 536
is defined by ribs 538, and directs air (as will be described
hereinafter) into window 540. Smaller, angled channels 542, 544,
546 direct air through apertures 548, 550, 552 (FIGS. 18 and
19).
[0092] Turning now to FIG. 19, there is a first forward-view mirror
554 located within housing 512. Mirror 554 is preferably fixed
within housing 512, but it is to be understood that it could be
movable, by manual means, by an electric motor or by any other
means. Second forward-view mirror 556 is also located within
housing 512. Mirror 556 is preferably adapted to be movable for
adjustment by an electric motor located in housing 512 behind
mirror 556 at 558, but such a motor and its associated cabling and
switching is not shown. If such a motor was used it may be
substantially similar to those conventional arrangements used to
adjust rear-view mirrors. Of course, any other form of
adjustability may be used.
[0093] FIG. 21 shows a preferred angular arrangement for the mirror
assembly of FIG. 19. 560 is the side of a right hand drive vehicle,
and 562 is the line of the rear of a mirror assembly 510. It can be
seen that the angle between mirror 556 and line 562 is 400, and
that between mirror 554 and line 562 is 55.degree.. Of course,
those angles are exemplary only, and even if the mirror 556 used
the angle 40.degree., that angle would be likely in use to have to
be adjusted to at least a small degree. There is an exemplary
distance of 50 mm between mirrors 554 and 556.
[0094] FIGS. 22 and 23 show respectively plan views of mirrors 554
and 556, with preferred shapes. Mirror 556 is shown with sides C
and D, which are also shown in FIG. 21. Those sides are preferably
50 mm and 67 mm long respectively, and the top and bottom are
preferably 90 mm and 95 mm long respectively. Mirror 554 is shown
with sides E and F, which are also shown in FIG. 21. Those sides
are preferably 50 mm and 70 mm long respectively, and the top and
bottom are preferably 80 mm and 87 mm long respectively. Of course,
all of the angles and dimensions are exemplary only, and may be
changed.
[0095] In use, a driver will look into the aperture 516 (FIG. 19)
in the direction of the arrow in FIGS. 19 and 21, if the driver
wishes to see ahead of the vehicle immediately in front of his or
her vehicle. It will be seen from FIG. 19 in particular that mirror
556, the "image capturing" mirror, is located well outboard of the
side of the vehicle, and is thus able to receive images from such a
vehicle two vehicles in front. The light from that vehicle two
vehicles in front passes through window 518, is reflected from
mirror 556 to mirror 554, and then reflected from mirror 554
through aperture 514 to the eyes of the driver.
[0096] As has been stated, a similar unit may (in the case of a
right hand drive vehicle) be located on the left hand side of the
vehicle, to look forward along the left side of the vehicle.
Preferably, both assemblies 510 would have mirror 556 adjustments
by electric motors, operable from a position conveniently close to
the driver.
[0097] The window 518 may become dirty, making any image seen by
the driver to be extremely unclear. The present invention seeks to
provide an improved arrangement to overcome such difficulties.
Returning now to FIGS. 18 and 20, in particular FIG. 18, one is
able to see the apertures 564 located at the base of window 518 in
the front of housing 512, which apertures communicate with channels
536, 542, 544 and 546.
[0098] The small arrows in FIG. 18, running right to left and
upwards, indicate the direction of air flow when the vehicle (not
shown) is moving forwards. The consequent movement of the assembly
510 forwards through the air creates those air flows. Air striking
channels 520/ribs 522 will be directed by channels 520 through
apertures 526 and across window 518, right to left, as shown in
FIG. 18. Air striking channels 538, 542, 544 and 546 is directed by
those channels through apertures 564 across the outer surface of
window 518, from the base towards the top, as shown in FIG. 18.
[0099] In particular, the flow of air along channels 528, a flow
which may be regarded as tangential or generally tangential, which
induces a venturi effect. In that effect, a pressure differential
in a fluid such as air is caused by a flow of that fluid past an
area or location, reducing the pressure at that area or location.
In turn, fluid at a higher pressure will be induced to flow through
that area or location.
[0100] In the embodiment of FIGS. 18 and 20, the fluid is of course
air, and apertures 534 are venturis, with the lower pressure
drawing in air from right to left in FIG. 18. At least some of the
air drawn in through venturis 534 may be the air which is directed
across the outer face of window 518. The streams of air exiting
apertures 526 and heading in the direction of apertures 534,
whether being at least partially induced or not, may create a
curtain of air, flowing right to left in FIG. 18, which acts to
remove water deposited by of rain, fog, sleet, snow and the like,
and airborne and/or water-borne contaminants, such as dirt and mud,
from adhering to window 518 and at least partially obscuring the
forward view seen by the driver of the vehicle. That arrangement
may be augmented by the flow of air upwards through apertures 564,
or those air streams may create another curtain of air moving
upwards across the face of window 518.
[0101] Of course, either of the arrangements of channels and
apertures (520/526 and 538/542/544/546/564) may be omitted.
Additional cleaning means may be used. At least one small wiper may
be used to clean the window 518, and/or a window-washing
arrangement using water or another fluid sprayed or otherwise
applied to window 518 may be employed.
[0102] In addition, the window 518 may be fitted with demister
elements of the electrically-powered type used in motor vehicle
rear windows, or in any other form where heat is applied to the
window to vaporise or defrost water on the surface(s) of the window
18, whether in the form of liquid water, ice or a slurry such as
sleet.
[0103] Alternatively, hot or warm air or any other fluid may be
piped to the body 512 of the assembly 510 from the vehicle's
demister, to vaporise water from, or defrost, elements of the
assembly 510, including window 518.
[0104] The embodiment of FIGS. 24 to 26 inclusive includes a number
of additional, optional, features. Features designated with the
same reference numerals as those used in relation to FIGS. 18 to
23, designate the same features in FIGS. 24 to 26. Venturi drain
564 is generally similar to that shown in FIG. 20, and may be
constituted by the same features. Optionally, on the end of body
512 where venturi drain 564 is located, a turn/hazard indicator
light or the like may be mounted. More preferably, the indicator
may be housed in the ribs 530 (FIG. 18) and/or on the floor of the
body 512 between mirrors 554 and 556. This may be used as an added
reflecting device, to direct the indicator light forwards and
backwards.
[0105] Turning now to FIG. 24, a venturi slot and wing 566 is
located on the front face of body 512, in much the same way as
shown in FIGS. 18 and 19. Four additional venturi apertures or
vents 568 allow air to flow across the inside of window 518 to
minimise fogging on the window, and to remove water deposition or
condensation on the inner surface.
[0106] The short arrows in FIG. 24 show the flow of air entering at
the base of window 518, and flowing across the interior of the
window 518, and exiting through venturi drain 564, or through the
top of window 518 as shown.
[0107] Area 574 in FIG. 24 is a "catchment area" adapted to receive
water such as rainwater and the channel it, as represented by the
long arrows in FIG. 24, across the face of window 518, to keep
window 518 clean. A top venturi slot and wing 570 is provided above
window 518 for the extraction of water flowing from catchment 574.
It should be noted that this cleaning mechanism, and all of the
cleaning arrangements disclosed in this application, could be used
with video camera based forward viewing arrangements, either with
the simple location of such a camera located behind a window such
as window 518, or by applying one or more such arrangements to a
lens of the camera.
[0108] Optionally, one or both of mirrors 554, 556 may be tilted at
an angle to a vertical plane. Such a degree of tilt may be between
5.degree. and 10.degree.. Preferably, mirror 554 may be tilted such
that its top is tilted back compared to its base. Preferably,
mirror 556 may be tilted such that its top is tilted away from the
vehicle on which the assembly 510, in which the mirror 556 is
located, is mounted. Of course, the tilt of each of the mirrors
554, 556 may be reversed, or both mirrors 554, 556 may have the
same tilt.
[0109] It can be seen that this invention provides an improved
forward viewing apparatus for motor vehicles.
[0110] The entire contents of the specifications (including
drawings) of Australian provisional patent applications nos.
2003900638, filed 13 Feb. 2003, 2003903410, filed 4 Jul. 2003, and
2003906716, filed 5 Dec. 2003, are hereby incorporated into the
present specification. The claims of this application form part of
the disclosure of this specification.
* * * * *