U.S. patent application number 09/793762 was filed with the patent office on 2001-08-30 for hermetic enclosure having air pressure adjustable function.
Invention is credited to Hirano, Katsuya.
Application Number | 20010017212 09/793762 |
Document ID | / |
Family ID | 18578644 |
Filed Date | 2001-08-30 |
United States Patent
Application |
20010017212 |
Kind Code |
A1 |
Hirano, Katsuya |
August 30, 2001 |
Hermetic enclosure having air pressure adjustable function
Abstract
A hermetic enclosure having an air pressure adjustable function,
which can adjust inside air pressure of the hermetic enclosure, is
provided. In order to prevent devices in the hermetic enclosure
from corroding, the hermetic enclosure having an air pressure
adjustable function provides a main body having a clearance part
and a packing fixing groove, a door, and packing that is fixed to
the packing fixing groove of the main body. And the door is jointed
with the main body by placing the packing between the door and the
main body in a state that the door is able to slide on the packing.
And when inside and outside air pressure of the hermetic enclosure
becomes different, the door moves on the packing and the clearance
part of the main body is changed, and the inside and outside air
pressure is adjusted to be almost equal.
Inventors: |
Hirano, Katsuya; (Tokyo,
JP) |
Correspondence
Address: |
SUGHRUE, MION, ZINN, MACPEAK & SEAS
2100 Pennsylvania Avenue, N.W.
Washington
DC
20037
US
|
Family ID: |
18578644 |
Appl. No.: |
09/793762 |
Filed: |
February 27, 2001 |
Current U.S.
Class: |
174/17GF |
Current CPC
Class: |
H05K 5/068 20130101 |
Class at
Publication: |
174/17.0GF |
International
Class: |
H05K 005/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 29, 2000 |
JP |
057981/2000 |
Claims
What is claimed is:
1. A hermetic enclosure having an air pressure adjustable function,
which changes the volume of a hermetic enclosure so that inside air
pressure of said hermetic enclosure is made to be almost equal to
outside air pressure when said inside air pressure of said hermetic
enclosure is different from said outside air pressure.
2. A hermetic enclosure having an air pressure adjustable function,
in which a main body of said hermetic enclosure or a door of said
hermetic enclosure is movable, and which moves said main body or
said door of said hermetic enclosure so that the volume of said
hermetic enclosure is changed.
3. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 2, wherein: said volume of said hermetic
enclosure is changed by making said main body or said door of said
hermetic enclosure move so that inside air pressure of said
hermetic enclosure is made to be almost equal to outside air
pressure.
4. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 2, wherein: said main body and said door
of said hermetic enclosure are jointed with a sliding means.
5. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 3, wherein: said main body and said door
of said hermetic enclosure are jointed with a sliding means.
6. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 2, wherein: said hermetic enclosure
changes said volume of said hermetic enclosure by making a
clearance between said main body and said door of said hermetic
enclosure increase or decrease in one axis direction or the
circumference direction.
7. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 3, wherein: said hermetic enclosure
changes said volume of said hermetic enclosure by making a
clearance between said main body and said door of said hermetic
enclosure increase or decrease in one axis direction or the
circumference direction.
8. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 2, comprising: a separation preventing
means that prevents said main body and said door of said hermetic
enclosure from separating.
9. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 3, comprising: a separation preventing
means that prevents said main body and said door of said hermetic
enclosure from separating.
10. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 1, comprising: an air pressure detecting
means for detecting said inside and outside air pressure of said
hermetic enclosure or an air pressure difference between said
inside and outside of said hermetic enclosure.
11. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 3, further comprising: an air pressure
detecting means for detecting said inside and outside air pressure
of said hermetic enclosure or an air pressure difference between
said inside and outside of said hermetic enclosure.
12. A hermetic enclosure having an air pressure adjustable
function, comprising: a main body having a clearance part and a
packing fixing groove; a door; and packing that is fixed to said
packing fixing groove of said main body; wherein: said door is
jointed with said main body by placing said packing between said
door and said main body in a state that said door is able to slide
on said packing, and when inside and outside air pressure of said
hermetic enclosure becomes different, said door moves on said
packing and said clearance part of said main body is changed, and
said inside and outside air pressure is adjusted to be almost
equal.
13. A hermetic enclosure having an air pressure adjustable
function, comprising: a main body having a clearance part; a door
having a packing fixing groove; and packing that is fixed to said
packing fixing groove of said door; wherein: said door is jointed
with said main body by placing said packing between said door and
said main body in a state that said door is able to slide on the
surface of said main body, and when inside and outside air pressure
of said hermetic enclosure becomes different, said door having said
packing moves on the surface of said main body and said clearance
part of said main body is changed, and said inside and outside air
pressure is adjusted to be almost equal.
14. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 12, further comprising: a door separation
preventing means for preventing said door from separating from said
main body.
15. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 13, further comprising: a door separation
preventing means for preventing said door from separating from said
main body.
16. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 12, wherein: said packing fixing groove is
added to said main body by one or more and the same added number of
said packing is added and fixed to said added packing fixing
grooves.
17. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 13, wherein: said packing fixing groove is
added to said door by one or more and the same added number of said
packing is added and fixed to said added packing fixing
grooves.
18. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 12, wherein: said door is added by one or
more and said added door is jointed with said main body in which
the same added number of said packing fixing groove is added and
the same added number of said packing is fixed to said added
packing fixing groove.
19. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 13, wherein: said door is added by one or
more and said added door is jointed with said main body in a state
that the same added number of said packing fixing groove is added
to said added door and the same added number of said packing is
fixed to said added packing fixing groove.
20. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 12, further comprising: a air pressure
detecting means for detecting said inside and outside air pressure
of said hermetic enclosure; a door moving distance deciding means
for deciding a door moving distance and direction based on the
detected result at said air pressure detecting means; and a door
moving means for moving said door based on the decided result at
said door moving distance deciding means.
21. A hermetic enclosure having an air pressure adjustable function
in accordance with claim 13, further comprising: a air pressure
detecting means for detecting said inside and outside air pressure
of said hermetic enclosure; a door moving distance deciding means
for deciding a door moving distance and direction based on the
detected result at said air pressure detecting means; and a door
moving means for moving said door based on the decided result at
said door moving distance deciding means.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a hermetic enclosure having
an air pressure adjustable function using for such as communication
equipment.
[0002] Description of the Related Art
[0003] At a conventional enclosure, in order to adjust its air
pressure, an air pressure adjusting hole is provided. Consequently,
it is actually impossible to keep its hermetic state at the
conventional enclosure. And there is a following problem at the
conventional enclosure.
[0004] At the conventional enclosure such as for communication
equipment, the outside air flows into the enclosure and the inside
air flows out from the enclosure caused by the air pressure
difference between the inside and outside of the enclosure. And the
outside air contains much corrosive gas such as vapor and oxygen,
consequently there is a problem that the corrosion speed of devices
in the enclosure is made to be fast.
SUMMARY OF THE INVENTION
[0005] It is therefore an object of the present invention to
provide a hermetic enclosure having an air pressure adjustable
function that can adjust inside air pressure of the hermetic
enclosure in a state that its hermetic state of the hermetic
enclosure is kept, when inside and outside air pressure of the
hermetic enclosure becomes different.
[0006] According to a first aspect of the present invention, there
is provided a hermetic enclosure having an air pressure adjustable
function, which changes the volume of a hermetic enclosure so that
inside air pressure of the hermetic enclosure is made to be almost
equal to outside air pressure when the inside air pressure of the
hermetic enclosure is different from the outside air pressure.
[0007] According to a second aspect of the present invention, there
is provided a hermetic enclosure having an air pressure adjustable
function, in which a main body of the hermetic enclosure or a door
of the hermetic enclosure is movable, and which moves the main body
or the door of the hermetic enclosure so that the volume of the
hermetic enclosure is changed.
[0008] According to a third aspect of the present invention, in the
second aspect, the volume of the hermetic enclosure is changed by
making the main body or the door of the hermetic enclosure move so
that inside air pressure of the hermetic enclosure is made to be
almost equal to outside air pressure.
[0009] According to a fourth aspect of the present invention, in
the second and the third aspects, the main body and the door of the
hermetic enclosure are jointed with a sliding means.
[0010] According to a fifth aspect of the present invention, in the
second and the third aspect, the hermetic enclosure changes the
volume of the hermetic enclosure by making a clearance between the
main body and the door of the hermetic enclosure increase or
decrease in one axis direction or the circumference direction.
[0011] According to a sixth aspect of the present invention, in the
second and third aspect, the hermetic enclosure having an air
pressure adjustable function provides a separation preventing means
that prevents the main body and the door of the hermetic enclosure
from separating.
[0012] According to a seventh aspect of the present invention, in
the first and the third aspect, the hermetic enclosure having an
air pressure adjustable function provides an air pressure detecting
means for detecting the inside and outside air pressure of the
hermetic enclosure or an air pressure difference between the inside
and outside of the hermetic enclosure.
[0013] According to an eighth aspect of the present invention,
there is provided a hermetic enclosure having an air pressure
adjustable function. The hermetic enclosure having the air pressure
adjustable function provides a main body having a clearance part
and a packing fixing groove, door, and packing that is fixed to the
packing fixing groove of the main body. And the door is jointed
with the main body by placing the packing between the door and the
main body in a state that the door is able to slide on the packing.
And when inside and outside air pressure of the hermetic enclosure
becomes different, the door moves on the packing and the clearance
part of the main body is changed, and the inside and outside air
pressure is adjusted to be almost equal.
[0014] According to the present invention, when the inside and
outside air pressure of the hermetic enclosure becomes different,
the door of the hermetic enclosure moves and the volume of the
hermetic enclosure is changed in a state that the hermetic state of
the hermetic enclosure is kept. That is, in a state that the
outside air does not enter into the hermetic enclosure, the air
pressure difference between the inside and outside of the hermetic
enclosure is made to be almost equal. Consequently, the inside of
the hermetic enclosure keeps its water proof and rust preventive
functions, and applying an unnecessary stress to the hermetic
enclosure can be avoided.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The objects and features of the present invention will
become more apparent from the consideration of the following
detailed description taken in conjunction with the accompanying
drawings in which:
[0016] FIG. 1 is a sectional view showing a structure of a first
embodiment of a hermetic enclosure having an air pressure
adjustable function of the present invention;
[0017] FIG. 2A is a sectional view showing a state that the volume
of the hermetic enclosure of the present invention is a minimum
value;
[0018] FIG. 2B is a sectional view showing a state that the air
pressure inside and outside the hermetic enclosure of the present
invention is balanced at a normal state;
[0019] FIG. 2C is a sectional view showing a state that the volume
of the hermetic enclosure of the present invention is a maximum
value;
[0020] FIG. 3A is a perspective view showing a structure of a
packing fixing groove formed in all the inside surfaces of the
folded part of a door at the first embodiment of the present
invention;
[0021] FIG. 3B is a perspective view showing a structure of the
packing fixing groove formed in three inside surfaces of the folded
part of a door at the first embodiment of the present
invention;
[0022] FIG. 4 is a perspective view showing a structure of a
separation preventing means used a punch type lock at the first
embodiment of the present invention;
[0023] FIGS. 5A and 5B are perspective views showing a structure of
a separation preventing means used a stopper at the first
embodiment of the present invention;
[0024] FIGS. 6A and 6B are sectional views showing other structures
of the first embodiment of the hermetic enclosure having the air
pressure adjustable function of the present invention;
[0025] FIG. 7 is a sectional view showing a structure of a second
embodiment of the hermetic enclosure having the air pressure
adjustable function of the present invention;
[0026] FIGS. 8A and 8B are sectional views showing structures of a
sliding part having plural packing of the second embodiment of the
hermetic enclosure having the air pressure adjustable function of
the present invention;
[0027] FIGS. 9A and 9B are perspective views showing structures of
a third embodiment of the hermetic enclosure having the air
pressure adjustable function of the present invention;
[0028] FIGS. 10A and 10B are sectional views showing structures of
the third embodiment of the hermetic enclosure having the air
pressure adjustable function of the present invention; and
[0029] FIG. 11 is a sectional view showing a structure of a fourth
embodiment of the hermetic enclosure having the air pressure
adjustable function of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0030] Referring now to the drawings, embodiments of the present
invention are explained in detail. FIG. 1 is a sectional view
showing a structure of a first embodiment of a hermetic enclosure
having an air pressure adjustable function of the present
invention. As shown in FIG. 1, a hermetic enclosure 1 having an air
pressure adjustable function at the first embodiment of the present
invention consists of a main body 2, a door 3, packing 4, a packing
fixing groove 5 formed in the main body 2, and a clearance 6 formed
at a part of the main body 2. The packing 4 is mounted in the
packing fixing groove 5 of the main body 2, and the door 3 slides
on the packing 4. The main body 2 provides a clearance forming part
21, and a bottom part 22. The main body 2 joints with the door 3 by
placing the packing 4 between them. Consequently, the inside of the
hermetic enclosure 1 is shielded from the outside air and the
hermetic state of the hermetic enclosure 1 is kept, and this
hermetic state can be kept for a long period of time.
[0031] When the air pressure inside the hermetic enclosure 1 is
defined as Pi, the air pressure outside the hermetic enclosure 1 is
defined as Po, and the air pressure difference between them is
defined as .DELTA.P, .DELTA.P=Po-Pi. At the present invention, when
the air pressure difference .DELTA.P is a negative value, the
volume of the hermetic enclosure 1 is increased, and when the
.DELTA.P is a positive value, the volume of the hermetic enclosure
1 is decreased. That is, the volume of the hermetic enclosure 1 is
changed freely by moving the door 3 so that the .DELTA.P actually
becomes 0.
[0032] Next, the movement of the hermetic enclosure 1 having the
air pressure adjustable function of the present invention is
explained. FIG. 2A is a sectional view showing a state that the
volume of the hermetic enclosure 1 of the present invention is a
minimum value. FIG. 2B is a sectional view showing a state that the
air pressure inside and outside the hermetic enclosure 1 of the
present invention is balanced at a normal state. FIG. 2C is a
sectional view showing a state that the volume of the hermetic
enclosure 1 of the present invention is a maximum value. At the
present invention, the hermetic enclosure 1 is set in the normal
state shown in FIG. 2B at the beginning so that the clearance 6 is
positioned at the standard position at the time when the air
pressure difference .DELTA.P=0 Pa (pascal), at that the air
pressure is a normal value.
[0033] And as shown in FIG. 2A, when the inside air pressure Pi of
the hermetic enclosure 1 becomes lower than the outside air
pressure Po, the door 3 is moved toward the main body 2. That is,
the air pressure difference .DELTA.P becomes a positive value, and
the clearance 6 is decreased and the volume of the hermetic
enclosure 1 is decreased. Consequently, the air pressure difference
.DELTA.P becomes 0, and it is avoided that an unnecessary stress is
applied to the hermetic enclosure 1.
[0034] And as shown in FIG. 2C, when the inside air pressure Pi
becomes higher than the outside air pressure Po, that is, the air
difference .DELTA.P becomes a negative value, and the clearance 6
is increased and the volume of the hermetic enclosure 1 is
increased. Consequently, the air pressure difference .DELTA.P
becomes 0, and it is avoided that an unnecessary stress is applied
to the hermetic enclosure 1.
[0035] During these movements, the door 3 slides on the packing 4,
therefore the hermetic state of the hermetic enclosure 1 is kept,
and even when the change of the air pressure inside and outside the
hermetic enclosure 1 occurs, the balance of the air pressure inside
and outside the hermetic enclosure 1 can be kept.
[0036] At the first embodiment of the present invention, as shown
in FIGS. 1 and 2, the sectional shape of the packing 4 provided in
the sliding mechanism is round or elliptic. This sliding mechanism
consists of the door 3 and the packing 4, and the packing 4 is
mounted in the packing fixing groove 5. At the first embodiment,
the packing 4 is mounted in the packing fixing groove 5 in the main
body 2. However, the packing fixing groove 5 can be formed in the
door 5 instead of in the main body 2, and the packing 4 can be
mounted in the packing fixing groove 5 in the door 3. In this case,
the sliding surface is positioned on the surface of the main body
2, facing the door 3 provided the packing fixing groove 5. At the
first embodiment, the sliding surface is positioned on the surface
of the door 3, facing the main body 2 provided the packing fixing
groove 5.
[0037] As shown in FIG. 1, the door 3 provides a side wall part 11
and a folded part 12 formed in the parallel direction to the side
wall part 11. Therefore, at the case that the packing fixing groove
5 is provided in the door 3, the packing fixing groove 5 is formed
at the folded part 12.
[0038] As mentioned above, the packing fixing groove 5 is formed
either in the main body 2 or the door 3.
[0039] FIG. 3A is a perspective view showing a structure of the
packing fixing groove 5 formed in all the inside surfaces of the
folded part of the door 3 at the first embodiment of the present
invention. FIG. 3B is a perspective view showing a structure of the
packing fixing groove 5 formed in three inside surfaces of the
folded part of the door 3 at the first embodiment of the present
invention. And in FIGS. 3A and 3B, the packing fixing groove 5 is
shown as =line. As shown in FIGS. 3A and 3B, the packing fixing
groove 5 can be formed in various structures depending on the
shapes of the main body 2 and the door 3. As mentioned above, at
the first embodiment of the present invention, when the outside air
pressure changed, in order to relax the stress applying to the
hermetic enclosure 1, caused by the air pressure difference between
the inside and outside the hermetic enclosure 1, the volume of the
hermetic enclosure 1 is made to change by moving the door 3.
[0040] The size of the changing volume of the hermetic enclosure 1
is decided by the size of the clearance 6. The size of the
clearance 6 can be set arbitrarily, therefore the present invention
can be applied to any hermetic enclosure having various sizes.
[0041] The minimum volume of the hermetic enclosure 1 is shown at
that the clearance 6 is at the position shown in FIG. 2A, and the
maximum volume of the hermetic enclosure 1 is shown at that the
clearance 6 is at the position shown in FIG. 2C. In FIG. 2A, at the
case that the hermetic enclosure 1 is at the minimum volume, the
tip of the door 3 may touch the main body 2. In this case, at least
either the touching part of the main body 2 or that of the door 3
can be formed by an elastic material such as rubber and a spring.
By using this material, the hermetic enclosure 1 can be prevented
from deforming when the door 3 moved suddenly. At the case that the
rubber is used as the elastic material, the touching part can be
formed by a material covered with the rubber.
[0042] When the air pressure difference .DELTA.P becomes a negative
value, that is, the hermetic enclosure 1 becomes the maximum volume
as shown in FIG. 2C. In order to prevent that the door 3 is
separated from the main body 2, it is desirable to provide a
separation preventing means. FIG. 4 is a perspective view showing a
structure of a separation preventing means used a punch type lock
at the first embodiment of the present invention. FIGS. 5A and 5B
are perspective views showing a structure of a separation
preventing means used a stopper at the first embodiment of the
present invention. As shown in FIG. 4, when the door 3 is moved to
the limit position, the punch type lock works and the door does not
move any farther. And as shown in FIGS. 5A and 5B, a supporting
component 42 is fixed to the main body 2, a supporting component 43
is fixed to the door 3, and a three fold chain 45 using such as a
wristwatch band is jointed with these supporting components 42 and
43. One or more this separation preventing means can be used at the
embodiment of the present invention.
[0043] FIGS. 6A and 6B are sectional views showing other structures
of the first embodiment of the hermetic enclosure 1 having the air
pressure adjustable function of the present invention. As shown in
FIG. 6A, at this embodiment, a part of the main body 2 is covered
with the door 3, in this case, a stopper 32 is provided at the main
body 2. And at the case shown in FIG. 6B, a part of the main body 2
is covered with the door 3, but the stopper 32 is not provided.
[0044] Next, a second embodiment of the present invention is
explained. FIG. 7 is a sectional view showing a structure of the
second embodiment of the hermetic enclosure 1 having the air
pressure adjustable function of the present invention. As shown in
FIG. 7, at the second embodiment, plural packing 4 are provided. In
FIG. 7, the number of the packing 4 is two, however the number of
the packing 4 is not limited to two, and two or more packing 4 can
be used. In this case, the number of packing fixing grooves 5 is
equal to the number of the packing 4. And the other functions are
the same that the first embodiment has. That is, the packing fixing
grooves 5 can be formed on the main body 2 or the door 3, and the
sliding surfaces are the opposite side of the surface in which the
packing fixing grooves 5 are formed.
[0045] FIGS. 8A and 8B are sectional views showing structures of
the sliding part having the plural packing 4 of the second
embodiment of the hermetic enclosure 1 having the air pressure
adjustable function of the present invention. As shown in FIG. 8A,
a stopper 15 is provided at the end of the sliding part, and as
shown in FIG. 8B, a stopper 25 is provided at the other end of the
sliding part. These stoppers 15 and 25 can be used as the
separation preventing means mentioned at the first embodiment.
Instead of using the stoppers 15 and 25, one of the plural packing
4 can be used as a stopper by fixing one of the plural packing 4 at
the opposite surface of the packing fixing groove 5. At the second
embodiment, the other functions are the same that the first
embodiment has. For example, the sectional shape of the packing 4
is the same that the first embodiment has.
[0046] Next, a third embodiment of the present invention is
explained. FIGS. 9A and 9B are perspective views showing structures
of the third embodiment of the hermetic enclosure having the air
pressure adjustable function of the present invention. As shown in
FIGS. 9A and 9B, plural doors 3 are provided at the third
embodiment. In FIG. 9A, the packing fixing groove 5 is provided at
all the inside surfaces of the folded part of each of the doors 3,
and in FIG. 9B, the packing fixing groove 5 is provided at three
inside surfaces of the folded part of each of the doors 3. In this,
the packing fixing grooves 5 are shown as the =line. However, the
packing fixing grooves 5 can be formed at both sides of the main
body 2, where the doors 3 are jointed with, instead of at the doors
3. And at the third embodiment, the number of the packing fixing
grooves 5 is not limited to one, and one or more packing fixing
grooves 5 can be formed, together with the number of the packing
4.
[0047] FIGS. 10A and 10B are sectional views showing structures of
the third embodiment of the hermetic enclosure having the air
pressure adjustable function of the present invention. In FIG. 10B,
a supporting component is added at the center of the main body 2.
As shown in FIGS. 10A and 10B, the plural doors 3 are jointed with
the main body 2, placing the packing 4 between each of the doors 3
and the both sides of the main body 2. The movement of each of the
doors 3 is equivalent to the first embodiment. The other functions
are the same that the first embodiment has. For example, the number
of the packing fixing grooves 5 can be one or more, together with
the number of the packing 4.
[0048] Next, a fourth embodiment of the present invention is
explained. FIG. 11 is a sectional view showing a structure of the
fourth embodiment of the hermetic enclosure having the air pressure
adjustable function of the present invention. As shown in FIG. 11,
at the fourth embodiment, an air pressure detecting means 51, such
as an air pressure sensor, is provided at the main body 2 and/or
the door 3. And further, at the fourth embodiment, a door moving
means 53, which moves the door 3 so that the air pressure
difference .DELTA.P becomes 0 at the time when the .DELTA.P is not
0, by considering the friction factors .mu. between the packing 4
and the sliding part of the main body 2 or the door 3.
[0049] That is, as shown in FIG. 11, at the fourth embodiment of
the present invention, by using a value (air pressure or air
pressure difference) detected at the air pressure detecting means
51, the door 3 is moved and the air pressure difference .DELTA.P is
made to be 0. With this, the stress applying to the hermetic
enclosure 1 is decreased, and the hermetic enclosure 1 can be
prevented from deforming or damaging of metal fatigue.
[0050] Actually, at the fourth embodiment of the present invention,
an air pressure detecting and door moving means is provided. This
air pressure detecting and door moving means provides the air
pressure detecting means 51, which can detect the air pressure or
the air pressure difference .DELTA.P between the outside and inside
air pressure of the hermetic enclosure 1, a moving distance
deciding means 52, and the door moving means 53. The moving
distance deciding means 52 judges whether the air pressure
difference .DELTA.P is a positive value or a negative value by
using the .DELTA.P detected directly, or by calculating the
.DELTA.P based on the air pressure detected at the air pressure
detecting means 51, and informs the door moving means 53 of the
moving distance. And the door moving means 53 makes the clearance 6
increase or decrease based on the moving distance information from
the moving distance deciding means 52, and the volume of the
hermetic enclosure 1 is increased or decreased. Further, a feedback
means can be newly provided, and by detecting the change of the
volume of the hermetic enclosure 1, the feedback means executes the
feedback of the detected change and changes the volume of the
hermetic enclosure 1 more suitable. That is, the air pressure
detecting means 51 detects the change of the air pressure
difference caused by that the volume of the hermetic enclosure 1
was increased or decreased by the door moving means 53, and informs
the feedback means of the detected result.
[0051] At the fourth embodiment, the maximum volume Vmax of the
hermetic enclosure 1 can be set. And at the case that the hermetic
enclosure 1 became the maximum volume Vmax, and the outside air
pressure was still low, this Vmax can be used. In this case, the
stoppers mentioned above can be omitted. Further, one or more the
air pressure detecting means 51 and the door moving means 53 can be
provided.
[0052] At the fourth embodiment, it is possible to set that the
door 3 is moved only at the case that the air pressure difference
.DELTA.P exceeded a threshold value Pth, by releasing the stopper
of the door 3. With this, the door 3 is not moved until the air
pressure difference .DELTA.P reaches the threshold value Pth,
therefore electric power for moving the door 3 can be saved. And
the threshold value Pth is set to be in a range that the hermetic
enclosure 1 is not deformed, therefore deforming the hermetic
enclosure 1 can be prevented.
[0053] At the embodiments of the present invention, the packing 4
is not limited to special packing, and as the packing, existing
packing can be used. Further, packing contained a synthetic resin
material having elasticity, or packing used a soft metal such as
copper, aluminum, lead, and other metal, or packing combined with
an elastic material and the soft metal can be used. And at the
sliding part, in addition to the packing 4, skids can be used, or
instead of the packing material, the skids can be used as the
packing 4. As these skids, a liquid type or a solid type can be
used, but as the packing 4, the solid type is used. This material
using at the sliding part keeps the hermetic state of the hermetic
enclosure 1, by that the air pressure difference .DELTA.P between
the outside and inside the hermetic enclosure 1 is made to 0 by
making the part of the hermetic enclosure 1 move.
[0054] At the present invention, as mentioned above, when the air
pressure difference .DELTA.P occurs between the inside and outside
of the hermetic enclosure 1, the volume of the hermetic enclosure 1
is changed and the air pressure difference .DELTA.P is decreased.
With this, the stress applying to the hermetic enclosure 1 is
decreased, and this prevents the hermetic enclosure 1 from
deforming and damaging. Further, when a vapor absorbing material or
an oxygen absorbing material is additionally put into the hermetic
enclosure 1, even if the hermetic state of the hermetic enclosure 1
is decreased, or outside air enters into the hermetic enclosure 1,
the deterioration of devices inside the hermetic enclosure 1 can be
prevented actually, and the hermetic state of the hermetic
enclosure 1 can be kept actually. As the vapor absorbing material
or the oxygen absorbing material, an existing material can be
used.
[0055] And at the present invention, within the range of the
strength of the material forming the hermetic enclosure 1, the
inside air pressure of the hermetic enclosure 1 can be adjusted to
air pressure being different from the outside air pressure. For
example, by that the inside air pressure of the hermetic enclosure
1 is set to be a little higher than the outside air pressure, and
even when the hermetic state of the hermetic enclosure 1 decreases,
the outside air is prevented from entering into the hermetic
enclosure 1. In this case, a gas storing means is provided, and an
inert gas is stored in this gas storing means, and further an air
pressure adjusting means is provided so that the inside air
pressure of the hermetic enclosure 1 is kept to be higher than the
outside air pressure. This can be executed by using the means
mentioned at the fourth embodiment of the present invention.
[0056] As mentioned above, at the present invention, when outside
air pressure increases, inside air pressure of an hermetic
enclosure can be increased, with keeping the hermetic state of the
hermetic enclosure, that is, the air pressure difference .DELTA.P
between the inside and outside of the hermetic enclosure can be
kept to be 0. And when the outside air pressure decreases, the
inside air pressure of the hermetic enclosure can be decreased,
with keeping the hermetic state of the hermetic enclosure, that is,
the air pressure difference .DELTA.P between the inside and outside
of the hermetic enclosure can be kept to be 0.
[0057] A hermetic enclosure of the present invention provides a
main body, a movable door, and packing. And the application of the
present invention is not limited to a special hermetic enclosure,
and the present invention can be applied to electronic instruments
such as a cellular phone, radio equipment, a display for a personal
computer, and electronic equipment. Further, the size of the
hermetic enclosure of the present invention is not limited to a
special size, and the present invention can be also used for a
relatively large size hermetic enclosure.
[0058] While the present invention has been described with
reference to the particular illustrative embodiments, it is not to
be restricted by those embodiments but only by the appended claims.
It is to be appreciated that those skilled in the art can change or
modify the embodiments without departing from the scope and spirit
of the present invention.
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