U.S. patent number 3,681,592 [Application Number 04/841,465] was granted by the patent office on 1972-08-01 for luminous energizer for fiber-optical cables.
This patent grant is currently assigned to Firma Ernie & Co.. Invention is credited to Max Hugelshofer.
United States Patent |
3,681,592 |
Hugelshofer |
August 1, 1972 |
LUMINOUS ENERGIZER FOR FIBER-OPTICAL CABLES
Abstract
A luminous energizer for a plurality of fiber-optical cables
comprises an aluminum heat-sink block formed with external cooling
fins and a chamber closely receiving a halogen lamp. A plurality of
passages in the block are aligned transversely of the lamp filament
and lie in a common plane therewith. Each passage is provided with
a light-conducting rod in heat-transferring relation with the
block. An end of a fiber-optical cable can be plugged into the end
of each passage to receive light from the rod. Polarizing or color
filters may be interposed between the end of the cable and the rod
or otherwise built into the block.
Inventors: |
Hugelshofer; Max (Dietlikon,
CH) |
Assignee: |
Firma Ernie & Co.
(Stationsstrasse, Bruttisellen, CH)
|
Family
ID: |
25284951 |
Appl.
No.: |
04/841,465 |
Filed: |
July 14, 1969 |
Current U.S.
Class: |
362/580; 362/552;
362/581 |
Current CPC
Class: |
G02B
6/4298 (20130101); G02B 6/0006 (20130101) |
Current International
Class: |
F21V
8/00 (20060101); G02B 6/04 (20060101); G02B
6/42 (20060101); F21v 029/00 (); G02b 005/16 () |
Field of
Search: |
;240/1EL,47 ;350/96 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Queisser; Richard C.
Assistant Examiner: Snee, III; C. E.
Claims
1. An apparatus for transmitting light, comprising, in
combination:
a massive solid heat-conductive aluminum block provided with a
chamber generally centrally in said block and substantially
surrounded by portions of substantially a major fraction of the
thickness of the block;
cooling fins formed on the exterior of said block for dissipation
of heat to the surrounding atmosphere;
a high-intensity halogen lamp received in said chamber and having
its envelope closely surrounded by the material of said block, the
wall of said chamber is formed with a light-reflecting coating;
a metallic grid in said chamber between said envelope and said
wall;
a plurality of generally radially outwardly extending bores formed
in said block and opening into said chamber, said lamp being
provided with an elongated filament, said one of said bores
extending transversely to said filament, said bores including two
bores on each side of a plane through said body parallel to said
filament, the bores on each side of said plane including acute
angles with one another;
respective solid light-conducting rods received in said bores and
hugged by the material of said body for heat transmission thereto,
said rods having inner ends closely juxtaposed with the envelope of
said lamp;
a flexible fiber-optical light conductor connected to said body at
one of said bores and juxtaposed with the opposite end of one of
said rods, said rods having a greater cross sectional area than
that of the fibers of said conductor;
an electrical transformer mounted on said block and connected with
said lamp for electrically energizing same; and
a light filter between said one of said rods and said conductor.
Description
1. Field of the Invention:
The present invention relates to an apparatus for optically
energizing a light-conducting cable or rod.
2. Background of the Invention:
Light-conducting cables consisting of a bundle of flexible
light-conducting fibers that transmit light from one end to the
other with very little loss. Because of this property they are
often used by doctors and dentists to illuminate body cavities and
by persons doing fine mechanical work since the light which can be
generated by the so-called "transmitting" end of the cable is
virtually heatless and much greater than the amount of light an
equivalent, conventional light source could produce. Furthermore,
light carried by such cables is useful for any of a multitude of
sophisticated electronic devices, for example, by those measuring
minute movements. Many other uses are also known, e.g. in the
computer industry.
The customary apparatus used to optically energize such a
light-conducting cable utilizes a high-power and, therefore,
high-wattage hot lamp of the type used in movie and slide
projectors. This lamp must, in conventional systems, be cooled by
some sort of ventilator and its light is often focused by a lens
system. Furthermore, only a rather limited number of cables, four
at the most, can be so illuminated and energized.
OBJECTS OF THE INVENTION
It is, therefore, the general object of the present invention to
provide an improved apparatus for luminously energizing a
light-conducting cable or rod.
A more specific object is to provide such an apparatus which
overcomes the above-mentioned disadvantages of excessive size,
complexity, heating, and cost.
SUMMARY OF THE INVENTION
The above objects are attained, in accordance with a principal
feature of the present invention, by an apparatus having a
heat-conducting rectangular parallelopipedal block which is formed
with a substantially central chamber along a vertical axis adapted
to receive a geometrically similar light-generating lamp, and with
a plurality of passages communicating with this chamber and aligned
with the lamp. Each passage is provided with a light-conducting
body that fits closely therein so that it will dissipate as much of
the heat that it absorbs from the lamp as possible.
According to further features of the present invention, the block,
which acts as a heat sink for the lamp, is formed of aluminum with
cooling fins, and simultaneously serves as the mount for a
transformer connected to the lamp to supply it with electric
current. The lamp is an incandescent halogen-type (e.g. iodine or
xenon) lamp with an elongated filament. For best results it has
been found that the passages should be oriented transversely to
this filament, and should all lie in substantially the same plane
as the filament.
DESCRIPTION OF THE DRAWING
The above and other objects, features, and advantages will become
more readily apparent from the following description, reference
being made to the accompanying drawing, in which:
FIG. 1 is a horizontal section through an apparatus according to
the present invention (along line I--I of FIG.2);
FIG. 2 is a section taken along lines II--II of FIG. 1,
respectively; and
FIG. 3 is a section corresponding to line III--III of FIG. 1,
illustrates a modification.
SPECIFIC DESCRIPTION
As shown in FIGS. 1-3, the apparatus comprises an aluminum block 1
formed with a plurality of cooling fins 2 and an upright central
bore 3 forming a chamber closely fitting a halogen lamp 4. This
lamp 4 is mounted in a socket 5 connected to a power supply
described below.
Extending radially outwardly from this central bore 3 in a common
plane are four passages 7 in line with the lamp 4 and communicating
with the chamber 3. Each passage 7 has a mouth 8 adapted to receive
the plug-in end 10 of a fiber-optical cable 11 protected by a
sheath 12. In addition, a light-conducting glass rod 9 is tightly
fitted and cemented in each passage 7.
In order to allow limited relative expansion and contraction
between the block 1 and the lamp 4, a flexible grid or screen cap
18 of metal can be slipped over the bulb 4 to allow maximum heat
transfer between this bulb 4 and the block 1 while allowing
virtually all of the light to pass.
The inside of the chamber 3 and, if desired, of the passages 7 is
provided with a reflecting mirror coating to ensure maximum light
transfer.
Thus, light generated by the bulb 4 passes through the rod 7 and,
if desired, through a filter 19 before entering the exposed ends of
the fibers forming the cable 11. Heat generated by this bulb 4 is
absorbed by the aluminum block 1 and dissipated by the fins 2. Heat
picked up by the rods 9 is largely dissipated into the walls of the
passages 7 so that the heat-sensitive cables 11, whose fibers are
independently of smaller cross-section than that of the respective
rod, are effectively protected.
As best seen in FIG. 2, the block 1 is formed below the bulb 4 with
a recess or compartment 13 covered by plate 14. This recess 13
allows replacement of the bulb 4 and can even serve to store spare
bulbs 4' . A second, larger recess or compartment 15 is provided
with a cover 17 and houses a transformer 16 which is connected to
the normal A.C. source to supply the correct voltage to the small
halogen lamp 4 through a flexible cable 6 leading to the removable
lamp socket 5.
The lamp 4 has a helically coiled filament 4' which is slightly
elongated. To absorb the greatest possible amount of light, the
passages 7 are directed toward the broad side of this filament,
thus, the passages 7 lie transversely to and in substantially the
same plane as the filament 4' , forming an acute angle to each side
thereof.
Four separate cables 11 can be plugged into the illustrated
embodiment. These cables 11, however, can simply be branches of a
common, larger cable if greater light intensity is desired. In
addition, fuses and a potentiometer can be employed in conjunction
with the transformer 16 to vary the light intensity, or a variable
transformer can be used.
As can also be seen from the drawing, especially FIGS. 2 and 3, the
aluminum block 1, finned on four sides surrounding the lamp, is a
rectangular parallelopiped and is solid except for the chamber and
downwardly open compartments 13 and 15. The cover 14 of the former
is press-fitted into place whereas the cover 17 is held in place by
bolts 17a which pass through spacer sleeves 17b and also fix the
transformer 16 in the compartment 15. The compartment 13 is axially
aligned with the chamber 3, the walls of which hug the glass
envelope of the lamp and conform generally to the configuration
thereof or are separated therefrom by the thickness of the metal
grid. The common plane of the passages 7 is horizontal and each of
these passages, which may also accommodate diverse optical
components such as the polarizing or color filter 19, is trained at
the filament of the lamp at the same angle. The fibers of the cable
are seen at 10a in FIG. 3. In FIG. 2, there is illustrated the line
cord 20 which serves to connect the apparatus to an electrical
outlet. This line cord is in series with a safety fuse 21, an
on-off switch 22 and a rheostat 23 or other voltage control for
adjusting the intensity of the lamp. Through the fuse, switch and
rheostat, the step-down transformer 16 is electrically energized to
operate the low-voltage lamp.
* * * * *