JP2000102503A - Light source device for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device for an endoscope in which heat generation of the power switch by the light source lamp can be effectively prevented even if the device is miniaturized. SOLUTION: A light source lamp 3 attached to a lamp holder 15 is set in a lamp house 16 near the center of the box-type main body 4 of this light source device. Illuminating light is provided to a light guide connector 12 detachably connected to a light guide connector connecting part 12 which is attached opposite to the front plate 4a of the light source lamp 3. A power switch 13 is attached to the front plate 4a adjacent to the light guide connector connecting part 12. The power switch 13 is covered by a switch cover 31 so that the power switch 13 will not be heated higher than an allowable temperature by the radiant heat of the light source lamp 3, and in addition, a switch shielding part 32 is formed by extending a shielding plate 10 between the light source lamp 3 and the front plate 4a to shield the power switch 13 from the radiant heat of the light source lamp 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope light source device for supplying illumination light to a light guide of an endoscope.

[0002]

2. Description of the Related Art In recent years, endoscopes have been widely used in the medical and industrial fields. When inspecting an internal inspection site such as a living body with the endoscope, an endoscope light source that supplies illumination light to a light guide as illumination light transmission means of the endoscope in order to illuminate the inspection site. The device is adopted.

Generally, in an endoscope light source device, for example, illumination light from a light source lamp (illumination lamp) housed in the housing is connected to a light guide connection portion provided on the front surface of the housing. A power supply switch is provided on the front of the housing so that the power can be supplied to the connector and the power switch can be easily turned on and off.

[0004]

The conventional light source device for an endoscope is large in size, requires a large space, requires much time to move from place to place, and can easily perform an endoscope inspection. Things are in demand. For this reason, when the endoscope light source device is miniaturized so as to take up a small space, the distance between the light source lamp and the power switch becomes short, and it is necessary to take measures so as not to exceed the heat resistant temperature of the power switch. For this reason, when the size is reduced, there is a problem that the temperature of the power switch rises due to radiant heat of the light source lamp or the like and deteriorates.

The present invention has been made in view of the above points, and provides a light source device for an endoscope which can effectively prevent a power switch from being heated by a light source lamp even when the power switch is downsized. It is intended to be.

[0006]

A light source lamp is housed inside a housing, and illumination light from the light source lamp is supplied to a light guide of an endoscope connected to a light guide connecting portion provided on the front of the housing. In a light source device for an endoscope, a heating switch for preventing the power switch from being heated by the light source lamp is provided for a power switch provided around the light guide connecting portion in front of the housing. Accordingly, even when the power switch must be provided near the light guide connection portion due to miniaturization, the power switch is prevented from being heated to an allowable temperature or higher.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 4 relate to a first embodiment of the present invention, FIG. 1 shows an external view of an endoscope light source device of the first embodiment, and FIG. FIG. 3 is an exploded view of the endoscope light source device of FIG. 1, FIG. 3 is a plan view of the endoscope light source device with the ceiling plate and the lamp house cover plate removed in FIG. 1, and FIG. 2 shows the back side of the power switch.

As shown in FIG. 1, a light source device 1 for an endoscope according to a first embodiment of the present invention has a height 2 and a small size in the left-right direction. As shown, the light source lamp 3 and the like are housed.

This housing 2 has a housing body 4 having a bottom plate portion, a front plate portion 4a formed by bending both ends of the bottom plate portion and a back plate portion, and covers the upper surface and both side surfaces of the housing body 4. An opening 7 for lamp replacement is formed in a side plate 6 on the left side of the ceiling plate 5, for example, and the opening 7 is fixed with screws. Lamp replacement door 8 is closed. These are formed of a metal plate member, for example, and have good heat resistance and light shielding properties.

As shown in FIGS. 1 and 2, a light guide connector connecting portion 12 to which a light guide connector 11 of an endoscope (not shown) is detachably connected is provided near the center of a front plate portion 4a of the housing 2. Further, a power switch 13 and an aperture adjusting knob 14 are provided at left and right positions of the light guide connector connecting portion 12 on the front plate portion 4a.

A substantially U-shaped lamp house 16 to which a lamp holder 15 to which the light source lamp 3 is attached is slidably mounted to the left in the vicinity of the center in the front-rear direction inside the housing is provided on the bottom plate portion. Installed. An opening is provided near the center of the front surface of the lamp house 16, and when the lamp holder 15 is set at a predetermined mounting position as shown in FIG. The lamp 3 is exposed.

An upper surface of the opening of the lamp house 16 is attached with a cover plate 18 with screws, so that the lamp house 1 can be opened.
6 is closed. This cover plate 18 is used for the lamp house 16.
An opening 19 extending from the front surface of the lamp house 16 to the front side is formed, and the lighting of the light source lamp 3 heats the ceiling plate portion 5 by radiant heat or the like. It has the function of a shielding plate to shield it from getting lost. The lamp house 16, the lamp holder 15, and the cover plate 18 are, for example, metal plates, and have good heat resistance and light shielding properties.
Also, the heat transfer characteristics are good.

A driving power converted to a predetermined voltage is supplied to the light source lamp 3 via a transformer 21 disposed at the rear of the lamp house 16, and the illuminating light of the light source lamp 3 which is turned on is reflected and condensed by the reflecting mirror 17. The illumination light can be supplied to the end face of the light guide connector 11 mounted on the light guide connector connection portion 12 disposed on the illumination light path in front of the light source lamp 3.

As shown in FIG. 3, a stop 9 is arranged in the illumination optical path, and by turning a stop adjusting knob 14, the arm of the stop 9 is turned and the end of the light guide connector 11 is rotated. The supplied illumination light can be adjusted.

A first heat-dissipating fan for blowing air to cool the heat generated by the light source lamp 3 opposite one opening (opening on the right side) opened on both sides of the lamp house 16. 23 is fixed to the bottom plate,
Further, a second fan 24 is mounted substantially adjacent to the first fan 23.

The first fan 23 blows air from one side opening of the lamp house 16 to the other side opening side, that is, as shown by an arrow a, and generates heat from the light source lamp 3. The back surface of the reflecting mirror 17 is cooled. The side plate 15a of the lamp holder 15 faces the other opening side,
The blown air passes through a ventilation hole (venting hole) 25 (see FIG. 2) formed in the side plate portion 15a, and further passes through a ventilation hole 26 provided in the lamp replacement door 8 facing the outside thereof. Is discharged. As shown in FIG.
5 and 26 are formed by slit-shaped openings extending in the horizontal direction.

The first fan 2 in the housing body 4
The second fan 24 disposed on the front side of the lamp housing 3 moves the space between the front surface of the lamp house 16 and the inner surface of the front plate portion 4a by an arrow b.
As shown by, the front concave portion and the front plate portion 4a of the reflecting mirror 17 which are blown from one side to the other side and heated by the radiant heat of the light source lamp 3 are heated by the radiant heat of the light source lamp 3. The shielding plate (heat shielding plate) 10 to be prevented is cooled. The shielding plate 10 includes a front surface of the lamp house 16 and a front plate portion 4a.
To prevent the front plate portion 4 a from being heated by the radiant heat of the light source lamp 3. The shielding plate 10 is, for example, a metal plate and has good heat resistance and heat conductivity.

As shown in FIG. 2, a side plate portion 27 formed on the extension portion 19 of the cover plate 18 is opposed to the other side portion facing the second fan 24, and the blown air is supplied to the side plate portion. 27
Then, the air is discharged to the outside of the housing 2 through a ventilation hole 29 provided in the side plate portion 6 facing the outside through the ventilation hole 28 formed in the housing 2.

As shown in FIG. 2, a ventilation port 30 is also provided on one of the side plates 6 facing the outside of the first and second fans 23 and 24, and the air flows through the ventilation port 30. Air is used for cooling.

As described above, in the present embodiment, vents 26 and 29 for discharging air used for cooling are provided on the outer surface of the housing 2, and the side plate portions 15a and
27 is also used as a shielding plate for shielding the light of the light source lamp 3 from leaking out of the housing 2.

In this embodiment, since the power switch 13 for turning on the power of the apparatus 1 is arranged near the light guide connector connecting portion 12 because of the miniaturization, the power switch 13 is a light source. A heating prevention means is provided for preventing the lamp 3 from being heated to a temperature higher than its allowable temperature by radiant heat or the like.

More specifically, as shown in FIGS. 3 and 4, the power switch 13 is covered with a switch cover 31 to shield radiant heat from the light source lamp 3 from directly shining on the power switch 13. And front panel 4
a switch shield part 32 that extends to the back side of the switch cover 31 and shields the radiant heat of the light source lamp 3 from passing through the switch cover 31 and transmitting to the power switch 13. Is provided. The switch shield 32 extends the end of the shield plate 10 on the side of the power switch 13 and bends at an angle smaller than a right angle near the back surface of the switch cover 31 to shield the radiant heat of the light source lamp 3.

As can be seen from FIG. 3, the air blown from the second fan 24 hits the bent and extended switch shield 32 obliquely, and a gap on the end side of the switch shield 32 is formed. A cooling means for preventing the temperature rise (heating) of the switch shield 32 itself is formed by using a structure in which the cooling air can be discharged from the side air port through the cooling air.

That is, in the prior art, the power switch is provided at a corner in the front where the radiant heat from the light source lamp does not reach, or the power switch is allowed even when the radiant heat is applied because the distance from the light source lamp is large. Although the temperature hardly rises above the temperature, the light source device 1 of the small-sized housing 2 as in this embodiment has the power switch 13.
Is provided on the front surface of the housing 2, the influence of the radiant heat from the light source lamp 3 increases.

Further, in this embodiment, as shown in FIG.
A shield plate 33 is provided below the opening where the
Is applied to the bottom of the housing body 4 to prevent the bottom side of the housing body 4 from being heated.

According to the present embodiment configured as described above, even if the power switch 13 is provided at a position adjacent to the light guide connector connecting portion 12 provided near the center of the front of the light source device 1 and the power source is reduced in size, Light source lamp 3 on switch 13
Of the light source lamp 3 can be prevented by the switch cover 31 and the switch shield 32, and the switch shield 32 is air-cooled by the air blown by the second fan 24. It can be prevented from being heated to a temperature higher than an allowable temperature by radiant heat or the like.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 and FIG. 6 show the peripheral portion of the power switch according to the second embodiment. In the present embodiment, for example, a temperature fuse 34 having a disconnection performance at an operating temperature of 98 ± 2 ° C. is attached to the switch shield 32, for example. The thermal fuse 34 is a fuse having a characteristic that it is disconnected by heat of a predetermined temperature lower than the allowable temperature of the electric components such as the power switch 13 constituting the light source device 1. ) Of the transformer 21 connected in series.
It is connected to the next winding.

Therefore, when the temperature fuse 34 reaches a predetermined temperature or higher during use in which the light source lamp 3 is turned on, power is not supplied to the light source lamp 3 and the light source lamp 3 is turned off. Further, a wind direction plate 35 is provided to extend from the cover plate 18 so that air blown from the second fan 24 passes through the lamp house 16 and passes through the front plate portion 4a side as shown in FIG. In FIG. 6, the position where the wind direction plate 35 is arranged is indicated by a two-dot chain line).

In the present embodiment, the thermal fuse 34 is provided at a position to which the radiant heat of the light source lamp 3 is applied and at a position where the air is reliably cooled in a normal state by, for example, the second fan 24 as the air cooling means. , Suppose the second fan 2
In the case where the cooling function is stopped due to a failure or the like or the function becomes insufficient, the radiant heat of the light source lamp 3 irradiates the heat so that the temperature rises due to the radiant heat before other parts. As a result, it is possible to prevent the thermal fuse 34 from breaking and other electrical components or the like from breaking down.

Further, the shield plate 33,
The shielding plate 10, the switch shielding part 32, and the light guide connector 11 can be effectively cooled. Other configurations are the same as those of the first embodiment.

According to the present embodiment, the second fan 24
In the case where the temperature inside the housing rises due to a failure or the like, it is possible to prevent the temperature from further rising due to the disconnection of the thermal fuse 34, and to prevent the other electric parts and the like from being thermally destroyed. It can be reliably prevented. The other effects are the same as those of the first embodiment.

In the above-described embodiment, the switch plate 32 is formed by extending the shield plate 10, but a shield plate or the like is attached to the shield plate 10 with screws or the like, and the switch cover 31 or The rear side of the power switch 13 where the switch cover 31 is not provided may be protected from radiant heat from the light source lamp 3 or the like.

A back cover of the power switch 13 is covered with a switch cover formed of an aluminum plate or the like, and the switch cover is exposed to cooling air from the second fan 24 to provide a means for preventing heating of the power switch 13. It may be formed. Further, the temperature fuse 34 may be attached to the shield plate 10 without extending the shield plate 10, so that the adverse effect due to the temperature rise may be more reliably prevented.

When the power switch 13 is covered with the switch cover 31 and is further shielded by the switch shield 32, the switch shield is not limited to a metal member such as aluminum having good heat dissipation, but may be a black resin. The power switch 13 may be covered with a tube or the like. The light source lamp 3 is a halogen lamp, a xenon lamp,
The present invention is effective when the apparatus is downsized by using a discharge tube such as a metal halide lamp.

[Supplementary Notes] A light source lamp for housing the light source lamp inside the housing, and a light guide for an endoscope connected to a light guide connecting portion provided on the front of the housing, for an endoscope light source device for supplying illumination light by the light source lamp, For a power switch provided around the light guide connecting portion on the front of the housing, a heating prevention means for preventing the power switch from being heated by the light source lamp is provided. Light source device.

2. In Supplementary Note 1, the heating prevention means is disposed between the light source lamp and the power switch,
It is a shielding plate for shielding radiant heat of the light source lamp. 3. In Supplementary Note 1, the heating prevention means is a switch cover that covers a portion of the power switch on the light source lamp side. 4. In Supplementary Note 2, the heating prevention means has an air cooling means for further air cooling the shielding plate.

5. In Supplementary Note 3, the heating prevention means has an air cooling means for further air cooling the switch cover. 6. In Supplementary Note 4, the air cooling means includes a fan that blows air onto the shielding plate to perform air cooling. 7. In Supplementary Note 5, the air cooling means includes a fan that blows air onto the switch cover to perform air cooling.

8. In Supplementary Note 2, the shielding plate shields the front of the housing from being heated by the light source lamp. 9. In Supplementary Note 6, the shielding plate is provided with blocking means for turning off the power supplied to the light source lamp at an allowable predetermined temperature. 10. In Supplementary Note 9, the shutoff means is a thermal fuse that breaks at a predetermined temperature. 11. An endoscope light source device for supplying illumination light to an endoscope by a light source lamp, wherein a heat shielding means is provided between the light source lamp and a power switch.

[0039]

As described above, according to the present invention, the light source lamp is housed inside the housing, and the light guide of the endoscope connected to the light guide connecting portion provided on the front of the housing is different from the light guide described above. In a light source device for an endoscope that supplies illumination light from a light source lamp, a power switch provided around the light guide connection portion on the front of the housing prevents the power switch from being heated by the light source lamp. Because the heating prevention means is provided, even when the power switch must be provided near the light guide connection part due to miniaturization, it is possible to prevent the power switch from being heated to an allowable temperature or more. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of an endoscope light source device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the endoscope light source device of FIG. 1;

FIG. 3 is a plan view showing the light source device for an endoscope by removing a ceiling plate and a lamp house cover plate in FIG. 1;

FIG. 4 is an exemplary perspective view showing the configuration of the rear surface side of the power switch in FIG. 2;

FIG. 5 is a perspective view showing a structure around a power switch according to a second embodiment of the present invention.

FIG. 6 is a plan view showing a structure around a power switch according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light source device for endoscopes 2 ... Case 3 ... Light source lamp 4 ... Case main body 4a ... Front plate part 5 ... Ceiling plate part 6 ... Side plate part 7 ... Opening part 8 ... Lamp exchange door 9 ... Aperture 10 ... Shielding plate 11 Light guide connector 12 Light guide connector connection 13 Power switch 14 Aperture adjustment knob 15 Lamp holder 16 Lamp house 17 Reflecting mirror 18 Cover plate 19 Extension part 21 Transformer 23 1 fan 24 ... second fan 25,26,28,29 ... vent (vent hole) 27 ... side plate 31 ... spare lamp 32 ... switch shield

Claims (1)

[Claims] 1. An endoscope which accommodates a light source lamp inside a housing and supplies illumination light from the light source lamp to a light guide of the endoscope connected to a light guide connecting portion provided on the front of the housing. In the light source device, for a power switch provided around the light guide connection portion on the front of the housing, heating prevention means for preventing the power switch from being heated by the light source lamp is provided. Endoscope light source device.