JPH0143927B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light source device for an endoscope used when inspecting the inside of a body cavity with an endoscope.

When inspecting the inside of a body cavity using an endoscope, the endoscope is connected to a light source device, and illumination light from this light source device is introduced into the body cavity. Therefore, if the collimation lamp built into the light source device breaks during the examination, it could cause serious safety problems such as damaging the body cavity wall when removing the insertion section of the endoscope inserted into the body cavity. A problem arises.

Therefore, in the past, a heat sink holding a spare lamp with the same output as the collation lamp was prepared, and when the collation lamp broke, the heat sink holding the collation lamp was manually transferred to the heat sink holding the spare lamp. Alternatively, you can install a spare lamp in the light source device, and when the collation lamp breaks, you can operate the mirror to change the optical path so that the illumination light from the spare lamp is introduced into the endoscope. Something was being done.

However, according to such conventional technology,
Since it is necessary to manually guide the illumination light from the spare lamp to the endoscope, it is not only difficult to perform the switching operation quickly, but also makes it difficult for the endoscope operator to interrupt operation of the endoscope and do it himself. There was also the inconvenience of having to rely on an assistant to perform the switching operation since it was not possible to switch the switch.

Additionally, in the past, in order to be able to continue endoscopy when the collimation lamp broke, the collimation lamp was replaced with a spare lamp of the same output. A spare lamp with the same output generates a large amount of heat, so it must be held in a heat sink to cool it, just like the collation lamp. Therefore, there is also a drawback that the entire light source device becomes large in size.

This invention was made with the focus on the ability to safely interrupt endoscopy when the collimation lamp is broken; An object of the present invention is to provide a light source device for an endoscope, which allows an emergency light having a smaller output than the collimation lamp to be automatically positioned on the optical path of the collation lamp.

The first embodiment of this invention will be described below with reference to FIGS. 1 to 6.
This will be explained with reference to the figures. 1 in FIG. 1 is a lamp house built into the light source device. Inside this lamp house 1, a pair of heat sinks 3 and 4 each having a large number of heat dissipating fins 2 formed on one side are provided with heat dissipating fins 2.
The heat sinks 3,
4 holds a collation lamp 5 as will be described later. The collimation lamp 5 is designed as shown in FIGS. 2 to 4. That is, the lamp body 6 is formed into a cylindrical shape having an exit window 7 on one end surface. A first cap 8 is attached to the other end of the lamp body 6. This first cap 8 has a two-stage structure consisting of a small diameter part 9 located on the outer end side and a large diameter part 10 continuous to the inside thereof, and the end surface of the small diameter part 9 has a plurality of screws. Holes 11... are formed. Further, an annular second cap 1 having approximately the same diameter as the large diameter portion 10 is provided at the intermediate circumferential portion of the lamp body 6.
2 is installed. In other words, the second base 12
is located between the injection window 7 and the first base 8. The collation lamp 5 configured in this manner has a first base 8 and a second cap installed in the mounting holes 13, 13 (only one is shown) that are drilled through the heat sinks 3, 4 in the thickness direction. The first base 8 is fixed to one of the heat sinks 3 by screws (not shown) through screw holes 11 formed in the end face thereof. Further, the emission window 7 of the collation lamp 5 faces the mounting hole 13 of the other heat sink 4, and illumination light is emitted from this mounting hole 13. On the optical path of this illumination light, there is a first condenser lens 1 as shown in FIG.
4 is arranged, and this first condenser lens 14
The illumination light focused on is incident on a light guide 15 of an endoscope that is detachably connected to a light source device.

In addition, the collation lamp 5 and the first condensing lens 1
4, a turret 16 is rotatably provided. This turret 16 includes a plurality of filters 17 each having different characteristics, such as a heat ray absorption filter and a neutral density filter, which control the characteristics of the illumination light incident on the light guide 15, and a second condenser lens 18. Retained. Further, an emergency light 19 having a smaller output than the collation lamp 5 is provided between the collation lamp 5 and the turret 16 so as to be movable forward and backward. In other words, emergency light 1
A socket 20 for holding the rotary solenoid 9 is provided on a mounting plate 23 fixed to a rotating part 22 of a rotary solenoid 21. Therefore, by operating the rotary solenoid 21 and rotating the mounting plate 23 in the direction of the arrow, the emergency light 19 is positioned on the optical path of the collation lamp 5 between the collation lamp 5 and the turret 16. I'm starting to do that.

The above turret 16 and rotary solenoid 21
is driven and controlled based on the control circuit shown in FIG. That is, when the collation lamp 5 whose lighting is controlled by the first lighting circuit 24 is disconnected and goes out, the disconnection detection circuit 25 detects this fact. Then, a signal from the disconnection detection circuit 25 causes the first drive circuit 26 to control the rotary solenoid 21, the second lighting circuit 27 to control the lighting of the emergency lights 19, and the control circuit 28 to control the rotation angle of the turret 16. Enter. Disconnection detection circuit 2
5, the first drive circuit 26 operates the rotary solenoid 21 to turn on the emergency light 19.
is positioned on the optical path of the collation lamp 5, and the second lighting circuit 27 turns on the emergency light 19. Further, the control circuit 28 sends a signal to a second drive circuit 29, and the second drive circuit 29, which receives this signal, operates the motor 30 that rotationally drives the turret 16. A setting circuit 31 and a position detection circuit 32 are connected to the control circuit 28, and the turret 16 is controlled based on the setting value set in the setting circuit 31.
As the rotation angle is rotated, the position detection circuit 32 detects whether or not the rotation angle at this time is appropriate, and this detection signal is fed back to the control circuit 28. That is, when the collation lamp 5 is outputting illumination light, the turret 1 is arranged so that one of the plurality of filters 17 is located on this optical path.
The rotation angle of the turret 1 is controlled so that when the collation lamp 5 is broken, the second condensing lens 18 is located on the optical path of the collation lamp 5.
6 is rotationally controlled. Therefore, at this time, the illumination light from the emergency light 19 is directed to the second condensing lens 18.
The light is focused by the first condensing lens 14 and enters the light guide 15. That is, the illumination light emitting position is different between the collation lamp 5 and the emergency lamp 19, and this difference is reflected in the second condensing lens 1.
8, the illumination light from the emergency light 19 is focused on the end face of the light guide 15.

In addition, the heat sink 3 of the lamp house 1,
A fan case 33 is provided on one side surface facing the end surface side of the heat sinks 3 and 4 so as to cover the entire side surface. A cooling fan 34 that generates flowing cooling air is housed.

According to the light source device configured in this manner, when the collation lamp 5 is disconnected, the signal from the disconnection detection circuit 25 is transmitted to the first drive circuit 26 and the second drive circuit 26 as described above.
The emergency light 19 is input to the lighting circuit 27 and the control circuit 28, and the rotary solenoid 21 is driven to turn on the emergency light 19, which enters between the collation lamp 5 and the turret 16 and is located on the optical path of the collation lamp 5. The rotation of the turret 16 is controlled so that the second condensing lens 18 provided on the turret 16 is connected to the collation lamp 5.
located on the optical path. Therefore, the illumination light from the emergency light 19 is focused by the second condensing lens 18 and the first condensing lens 14, enters the light guide 15, and is introduced into the body cavity through the insertion section of the endoscope. be done. Although the light intensity of the emergency light 19 is smaller than that of the collimation lamp 5, it is sufficient to know the condition inside the body cavity, so the insertion part of the endoscope can be inserted from inside the body cavity without damaging the body cavity wall. It can be removed and the endoscopy can be stopped.

That is, according to the above configuration, when the collation lamp 5 is disconnected, the emergency light 19 and the turret 16 are turned off.
The second condensing lens 18 provided in the
The endoscopy can be safely interrupted by reliably introducing the illumination light from the light guide 15 into the light guide 15. In addition, since the emergency light 19 has a smaller output than the collation lamp 5, it is not necessary to cool it by holding it in the heat sinks 3 and 4 like the collation lamp 5, so the installation space for the emergency light 19 is reduced. Only a small amount is required.

FIG. 7 shows a second embodiment of the present invention, which is different from the first embodiment in that the structure of the collation lamp 5 and the mechanism for driving the emergency light 19 onto the optical path of the collation lamp 5 are different from those of the first embodiment. are different. That is, a general xenon lamp 36 covered with an ellipsoidal mirror 35 was used as a collation lamp. Therefore, since the illumination light from the xenon lamp 36 is focused by the ellipsoidal mirror 35 and enters the light guide 15, it is not necessary to arrange the first condensing lens 14 between the turret 16 and the light guide 15. good.

Further, the emergency light 19 is attached to a socket 20 provided at the tip of a rack 36, and a pinion 38 fitted to a rotating shaft 37a of a motor 37 is meshed with the rack 36. And motor 3
7 is controlled by a first drive circuit 26 instead of the rotary solenoid 21 shown in the first embodiment, so that the emergency light 19 is moved forward and backward into the optical path of the collation lamp 5.

Note that this invention is not limited to the above embodiments,
For example, only the emergency light drive mechanism shown in the second embodiment may be applied to the first embodiment, or conversely, the emergency light drive mechanism shown in the first embodiment may be applied to the second embodiment. It may be applied to the embodiments. Furthermore, the emergency light may be equipped with a reflector so that the illumination light from the emergency light is efficiently incident on the light guide.

As described above, the present invention detects a break in the collation lamp by a detection circuit, and uses a signal from the detection circuit to turn on the emergency light and move it onto the optical path of the collation lamp, and also controls the rotation of the turret. Since the lens that focuses the illumination light from the emergency light attached to this turret is positioned on the optical path of the collation lamp, it is no longer necessary to manually adjust the illumination light when the collation lamp breaks. Since the replacement work can be performed automatically, this replacement work can be performed quickly and without relying on an assistant. Further, in the present invention, an emergency light with a smaller output than the collimation lamp is used from the viewpoint that it is sufficient to be able to safely interrupt the endoscopy when the collation lamp breaks. Therefore, there is no need to cool the emergency light by holding it in a heat sink like a collation lamp, so the installation space for the emergency light is small, and the light source device can be made more compact. Furthermore, the illumination light from the emergency lights is focused by the lens attached to the turret as the rotation of the turret is controlled.
The light can be made to enter the light guide of the endoscope reliably and efficiently.

[Brief explanation of drawings]

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a perspective view of the lamp house, FIG. 2 is a front view of the collimation lamp, FIG. 3 is a side view, and FIG.
The figures are also rear views, Figure 5 is a perspective view of the main parts, and Figure 6 is a perspective view of the main parts.
The figure is a control circuit diagram, and FIG. 7 is a perspective view of essential parts showing another embodiment of the invention. 5... Reference lamp, 16... Turret, 17... Filter, 18... Second condensing lens, 19... Emergency light, 25... Disconnection detection circuit, 26... First drive circuit (first control means), 27 ...Second lighting circuit (first
control means), 28... control circuit (second control means), 29... second drive circuit (second control means),
30...Motor (second control means), 31...Setting circuit (second control means), 32...Position detection circuit (second control means).

Claims (1)

[Claims] 1. A light source device for an endoscope that has a turret equipped with a filter that changes the characteristics of the illumination light from the collimation lamp and that enters the illumination light into the end face of the light guide of the endoscope. A collation lamp, a low-emission emergency light that does not require a cooling mechanism, a detection circuit that detects a break in the collation lamp, and a signal from this detection circuit to turn on the emergency light and perform the collation. A first control means for moving the lamp onto the optical path, and a lens attached to the turret and condensing the illumination light from the emergency light onto the end face of the light guide in response to a signal from the detection circuit. a second control means for rotationally controlling the turret so that the turret is positioned on the optical path of the endoscope.