JPH0366643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light source device for an endoscope, which is used, for example, to send illumination light to an endoscope.

For example, when observing the inside of a body cavity using an endoscope, the universal cord provided on the operation section of the endoscope is connected to a light source device, and the illumination light output from this light source device is transmitted to the insertion section of the endoscope. It is designed to emit light into the body cavity from the tip of the body. As shown in Utility Model Application No. 53-20656, the above light source device has a pair of heat sinks attached to a base made of an insulating material in parallel and facing each other, and a lamp is inserted into the mounting hole drilled in these heat sinks. The two ends of the two ends are fitted together.

Incidentally, the development of the above-mentioned lamps has progressed in recent years, and it has become possible to significantly increase the amount of light output from the lamps. When the light intensity of the lamp increases, infrared rays (heat rays) are emitted from the lamp.
also increases. Therefore, when sending illumination light to an endoscope, unless the heat rays are removed, problems such as heat loss will occur at the input end of the universal cord where the illumination light enters.

Conventionally, in order to remove the heat rays generated from the lamp, a filter for removing the heat rays has been provided on a heat sink separate from the heat sink holding the lamp. Therefore, it is necessary to incorporate two sets of heat sinks into the light source device, resulting in problems such as a complicated configuration, an increase in the size of the light source device, and an increase in the number of parts, resulting in increased costs. Moreover, if the filter is simply held on a heat sink, the filter will be heated to a high temperature and will break due to thermal expansion and thermal distortion, so the heat sink that holds the filter must be cooled, and a dedicated cooling fan is required to do so. It also has the disadvantage that it requires

This invention was made based on the above-mentioned circumstances, and its purpose is to attach a filter to a heat sink holding a lamp so as to be located on the optical path of the lamp, thereby making it possible to hold and cool the filter. It is an object of the present invention to provide a light source device in which the above filter can be provided without requiring a dedicated heat sink or cooling fan.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. Reference numeral 1 in FIG. 1 denotes a lamp house provided in the main body (not shown) of the light source device. A xenon lamp 3 is held within the lamp house 1 by a holding mechanism 2, which will be described later. This xenon lamp 3 is constructed as shown in FIGS. 2 to 4. That is, the lamp body 4 is formed into a cylindrical shape having an exit window 5 on one end surface. A first base 6 is attached to the other end of the lamp body 4.
is installed. This first cap 6 has a two-stage structure consisting of a small diameter part 7 located on the outer end side and a large diameter part 8 continuous to the inside thereof, and the end surface of the small diameter part 7 has a plurality of screws. Holes 9... are formed. Further, an annular second cap 10 having approximately the same diameter as the large diameter portion 8 is attached to the intermediate peripheral portion of the lamp body 4 . In other words, the second base 10 is connected to the exit window 5.
and the first base 6.

On the other hand, the holding mechanism 2 is constructed as shown in FIG. That is, numeral 11 in the figure is a base made of an electrically insulating material. On the bottom surface of this base 11, there are many heat radiation fins 12 on one side...
A pair of heat sinks 13 and 14 formed with heat sinks 13 and 14 are arranged in parallel in a spaced-apart manner facing each other with the surfaces on which the radiation fins 12 are provided facing outward. One of the heat sinks 13 has the first one of the xenon lamps 3.
A mounting hole 15 into which the small diameter portion 7 of the cap 6 is inserted is provided, and a stopper portion 16 that abuts against the rear end surface of the small diameter portion 7 is formed at the back of this mounting hole 15. In other words, the small diameter portion 7 of the first cap 6 is connected to the mounting hole 1.
5 and press the rear end surface of the small diameter portion 7 against the stopper portion 16 to position the first cap 6. Further, the stopper portion 16 has a hole 1 through which a set screw 17 passes.
8 is provided, and the first cap 6 is fixed to the mounting hole 15 by screwing a set screw 17 from this hole 18 into a screw hole 9 formed in the end surface of the first cap 6. It's becoming like that.

Further, a mounting hole 20 for inserting and holding the second cap 10 of the xenon lamp 3 is also formed in the other heat sink 14 so as to penetrate through the heat sink 14 in the thickness direction. An electrically conductive cap contact member 21 made of an annular elastic material is attached to the inner peripheral portion on the side opposite to the fins 12 . The second cap 10 is elastically supported by the cap contact member 21. The second cap 10 is held in the mounting hole 20 so as to be movable within a certain range in the optical axis direction. Furthermore, a first heat absorption filter 2 is provided on the side of the heat dissipation fin 12 of the mounting hole 20 on the optical path of the xenon lamp 3, spaced apart and facing the exit window 5 of the xenon lamp 3.
2 and the second heat ray absorption filter 23 are the spacer 2
These filters 22,
23 is held by a retaining ring 25 screwed onto the open end of the mounting hole 20. That is, the filters 22 and 23 are directly attached to the heat sink 14.

Further, each of the heat sinks 13 and 14 is attached to the base 11 as follows. That is, the heat sinks 13 and 14 are provided with through holes 26 that penetrate in the vertical direction, and these through holes 26...
Mounting screws 27... are inserted through the holes. Attachment holes 28 are formed in portions of the base 11 corresponding to the through holes 26, into which terminal members 29 having flanges 29a are fitted. The mounting screws 27 are screwed into screw holes 30 formed in the terminal members 29. Therefore,
The heat sinks 13, 14 and the base 11 are connected to each other such that the base 11 is held between the upper surfaces of the heat sinks 13, 14 and the flanges 29a of the terminal members 29. Moreover, the screw hole 3 of the terminal member 29...
0 are screwed with screws 32 for fixing crimp terminals 31. Note that the lower surface of the base 11 and the upper surface of the heat sinks 13 and 14 are provided with guide pins and guide holes (not shown) that fit into each other and position them.

Furthermore, the heat sink 1 of the lamp house 1
A fan case 33 is provided on one side surface facing the end surfaces of 3 and 14 so as to cover the entire side surface, and a heat sink 1 is disposed inside this fan case 33.
A cooling fan 34 that generates cooling air that flows parallel to the heat dissipation fins 12 formed at 3 and 14 is housed. Further, a universal cord of an endoscope (also not shown) is detachably connected to the main body of the light source device (not shown). A light guide is inserted through this universal cord, and the illumination light that has passed through the filters 22 and 23 is incident on the end face of this universal cord.

According to the light source device having the above configuration, the heat sink 1 for holding the xenon lamp 3 is
Since the first and second heat absorption filters 22 and 23 are installed in one of the mounting holes 15 and 20 formed in the holes 3 and 14, a dedicated heat sink is required to incorporate these filters 22 and 23 into the light source device. do not need. Further, the first and second heat absorption filters 22 and 23 held in the mounting hole 20 are connected to a cooling fan 3 that cools the heat sinks 13 and 14.
4, the filters 22, 2
There is no need for a dedicated cooling fan for cooling the heat sink 1, and the filters 22 and 23 are
4, these filters can be cooled efficiently and well.

6 and 7 show another embodiment of the present invention, in which a heat ray reflective filter 35 is installed as a filter in the mounting hole 20 of the heat sink 14.
The xenon lamp 3 is installed at an angle of inclination of about 45 degrees with respect to the optical path of the xenon lamp 3. The heat radiation fins 12 in the direction in which the heat rays are reflected by the heat ray reflection filter 35 have notches 36 through which the heat rays pass.
has been established.

According to this configuration, the light from the xenon lamp 3 is divided into visible light that passes through the heat ray reflection filter 35 and heat rays that are reflected by the filter 35, so the visible light is used as illumination light and the heat rays are It can be used as a heat source light. Also,
By making the capacity of the cooling fan 34 variable,
It is also possible to control the energy of the heat source light.

Note that this invention is not limited to the above embodiments,
Any filter may be used as long as it reduces the heat rays of the illumination light incident on the light guide, such as a heat ray transmission filter, a darkening filter, or a color temperature conversion filter.

As described above, in the present invention, since the filter is directly attached to the heat sink holding the lamp so as to be located on the optical path of the lamp, there is no need to use a dedicated heat sink to incorporate the filter. Therefore, the entire device can be downsized, the configuration can be simplified, and the number of parts can be reduced. Furthermore, by cooling the lamp, the filter built into the heat sink that holds the lamp is also cooled, eliminating the need for a dedicated cooling fan to cool the filter, which also simplifies the configuration. and a reduction in the number of parts. Moreover, since the filter is attached directly to the heat sink, heat conduction from the filter to the heat sink is improved, and the filter can be cooled efficiently.

[Brief explanation of drawings]

Figures 1 to 5 show one embodiment of the present invention, with Figure 1 being a schematic diagram of the overall configuration, Figure 2 being a front view of the lamp, Figure 3 being a side view, and Figure 4 being the same. 5 is a sectional view of the main parts, FIG. 6 is a schematic configuration diagram showing another embodiment of the present invention, and FIG. 7 is an explanatory diagram of the main parts. 3...Xenon lamp, 13, 14... Heat sink, 20... Mounting hole, 22, 23, 35...
filter.

Claims (1)

[Claims] 1. In an endoscope light source device in which a heat sink holds a lamp that injects illumination light into the end face of a light guide that is detachable from the device body, the heat sink has a mounting hole that passes through the optical path of the lamp, and this mounting A light source device for an endoscope, characterized in that a heat ray reduction filter is attached to the hole.