JPH06313851A - Light source device for endoscope - Google Patents

Abstract

PURPOSE:To provide a light source device for an endoscope capable of adjusting the intensity of illuminating light entering a light transmission means so as to supply the internal sight mirror with the illuminating light of optimum intensity distribution. CONSTITUTION:A light source device for an internal sight mirror is formed being provided with a light source lamp 2 having a radiating means 1; a normal diaphragm means 3 for increasing/decreasing the whole light quantity from the light source lamp 2; a filter 4 with concentric different transmittance parts independently of the diaphragm means 3; a driving means 5 for moving the filter 4 longitudinally on an optical path; a peripheral light quantity detecting means 8 for outputting a signal on the level corresponding to the brightness of the output peripheral image part of an image pickup element 7 for focusing a photographed body image from an endoscope 6; and a comparing means 9 for comparing the output of the peripheral light quantity detecting means 8 with a reference signal so as to output according to the difference. The output of the comparing means 9 is inputted into the driving circuit 5, and the filter 4 is moved longitudinally on the optical path so that the output of the comparing means 9 becomes zero.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device for an endoscope, and more particularly to a light source device for an endoscope capable of adjusting illumination light incident from a light source to an incident end portion of a light guide.

[0002]

2. Description of the Related Art Generally, a light source device for an endoscope focuses illumination light generated from a light source lamp onto an incident end portion of a light guide which is an illumination light transmitting means by using an optical system. Then, on the illumination light path from the light source lamp toward the incident end of the light guide, a light shield plate for partially blocking the illumination light is freely installed and removed, and the amount of illumination light is adjusted by controlling the position of the light shield plate. Was there.

Conventionally, as such a light quantity adjusting means,
For example, as disclosed in Japanese Laid-Open Patent Publication No. 54-65049, a light beam is asymmetrically blocked from one side to control the amount of emitted light, and disclosed in Japanese Utility Model Laid-Open No. 54-22418. As disclosed in Japanese Patent Laid-Open No. 1-172811, the above-mentioned Japanese Patent Laid-Open No. 1772811 discloses a method for controlling the amount of emitted light by varying the transmittance of the opto-ceramics on the optical path. 54-65049
There is a combination of a light extinguishing means and a light-shielding plate like No. All of these are for increasing or decreasing the total amount of emitted light, and for preventing deterioration of the light distribution and for preventing deterioration of the color temperature.

[0004]

However, in the prior art as described above, in the case of a tube-shaped object in the field of endoscopes, particularly a blood vessel having a small inner diameter, when the object is seen brightly, the wall surface of the peripheral portion is increased. Causes halation. Further, when observing the wall surface, the amount of emitted light must be narrowed down, and as a result, the image in the central portion becomes extremely dark.

Therefore, as described above, in the conventional technique,
In the case of a tube-shaped subject such as a blood vessel, it was impossible to observe the entire image at a suitable brightness at a time.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a light source device for an endoscope capable of adjusting the illumination light supplied to the endoscope to an optimum intensity distribution. There is.

[0007]

A light source device for an endoscope according to the present invention comprises a light source lamp for supplying illumination light and an optical transmission means for transmitting the illumination light through the endoscope. Mounting means for mounting an incident part for allowing illumination light to enter, optical means for converging the illumination light on an incident end face of the light transmitting means mounted on the mounting means, and incidence of the optical means and the light transmitting means. One or more disc-shaped filters, which are provided on the optical path of the end face and are movable along the optical path, and which have concentrically arranged regions having a plurality of different transmission characteristics sequentially in the radial direction, and the disc-shaped filter. And a driving means for moving the optical filter forward and backward along the optical path, and by moving the disk filter forward and backward along the optical path by the driving means, the intensity of the illumination light incident on the optical transmission means is increased. Adjust and optimize strength It can be supplied to the endoscope illumination light.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 8 relate to a first embodiment of the present invention. FIG. 1 is a block diagram showing a conceptual configuration of a light source device for an endoscope, and FIG. 2 is a schematic diagram of the light source device for an endoscope in FIG. 3 is a configuration diagram showing the detailed configuration of the light source device for the endoscope of FIG. 1, FIG. 4 is a configuration diagram showing the configuration of the heat sink of FIG. 3, and FIG. Configuration diagram showing the configuration of the optical circuit,
6 is a configuration diagram showing the configuration of the panel substrate of FIG. 3, FIG. 7 is an explanatory diagram illustrating the operation of the dimming circuit of FIG. 5 in the automatic dimming mode, and FIG. 8 is a diagram of FIG. 5 in the manual dimming mode. It is explanatory drawing explaining the effect | action of a light control circuit.

The light source device of the endoscope of the first embodiment is shown in FIG.
As shown in (a), the light source lamp 2 having the heat dissipation means 1
A normal diaphragm means 3 for increasing or decreasing the total amount of light from the light source lamp 2, and a filter 4 having concentrically different portions having different transmittances independently of the diaphragm means 3 (FIG. 1 (b)).
And a driving means 5 capable of moving the filter 4 back and forth on the optical path.
And a peripheral light amount detecting means 8 for outputting a signal of a level corresponding to the brightness of the peripheral image portion of the output of the image sensor 7 for forming a subject image from the endoscope 6, and the peripheral light amount detecting means 8
And the reference signal, and outputs according to the difference, the driving circuit 5 inputs the output of the comparing means 9 and moves the filter 4 back and forth on the optical path to perform the comparison. It operates so that the output of the means becomes zero.

With such a structure, the filter 4 is arranged on the optical path so that the brightness of the peripheral portion coincides with the reference signal, even if it is attempted to look bright as a whole when observing a tube-like object such as a blood vessel. Since the image on the monitor as shown in FIG. 2A is viewed on the X-Y line, the image on the monitor as shown in FIG. As can be seen, the wall surface of the peripheral part can be observed without causing halation.

A specific description will be given of the light source device having the conceptual configuration as described above.

As shown in FIG. 3, the light source device 10 includes the light source lamp 2 for generating illumination light, a heat sink 1a as the heat radiating means 1 having a plurality of fins also serving as electrodes of the light source lamp 2, and the heat sink 1a. A radiator holder 11 connected to the heat sink 1a for holding the heat sink 1a and transmitting electric power to the light source lamp 2, a fan 12 for applying cooling air to the light source lamp 2 and the heat sink 1a, the radiator holder 11 and A lighting circuit 13 for supplying electric power to the light source lamp 2 via a heat sink 1a, a lens 14 for condensing light emitted from the light source lamp 2, and the lens 14
A connector 15 to which a light guide of the endoscope 6 that guides the illumination light condensed by the lens to the subject is connected; a diaphragm 16 installed between the lens 14 and the connector 15 for controlling the amount of illumination light; A peripheral light amount controller 17 that is installed between the diaphragm 16 and the lens 14 and that controls the light amount of the ambient light of the illumination light and that changes the transmittance on a concentric circle, and for driving the diaphragm that changes the position of the diaphragm 16 to change the transmittance. The motor 18, an aperture position detection means 19 for detecting the position of the aperture 16 connected by a gear (not shown) so that the drive shaft and the rotation shaft of the aperture drive motor 18 are interlocked, and the peripheral light amount controller 17 are turned on. A drive motor 20 that moves back and forth in the axial direction, and the drive motor 2
To the peripheral light amount controller position detecting means 21 for detecting the position of the peripheral light amount controller 17, which is connected by a gear (not shown) so that the drive shaft of 0 and the rotary shaft are interlocked, to the aperture driving motor 18 and the drive motor 20. A dimming circuit 22 that outputs a drive signal, a panel substrate 23 on which a mode display for the user, a mode switching switch, and the like are mounted, and the dimming circuit 22 according to the mode switching output signal of the panel substrate 23. A CPU 24 that outputs an instruction to switch the operation of the panel substrate and controls the display of the panel substrate 23;
2, a panel substrate 23, and a power supply circuit 25 that supplies power to the CPU 24.

The heat sink 1a is rounded when cooled as shown in FIG. 4 (a), and heats each fin of a plurality of fins 31 made of a shape memory alloy which extends when heated as shown in FIG. 4 (b). It is composed of a base portion 32 that conducts. In the case of an ordinary heat sink, if the number of fins is increased in order to improve the heat dissipation effect, the thickness of the fins becomes thin and the thermal conductivity to the tips of the fins decreases, so that the heat dissipation effect of the entire heat sink does not improve.

Therefore, in the present embodiment, the fins 3 made of a shape memory alloy that are rounded in a spiral shape during cooling and extend when heated.
In the first state, since the fin 31 is rounded, it is equivalent to the fact that the thickness is increased, and the heat is transmitted to the entire fin 31 and the fin 31 extends. Fin 3
When 1 is extended, the surface area of the fin 31 is increased and the heat dissipation effect is enhanced, and the heat of the fin 31 is quickly dissipated into the air.
As a result, the temperature of the fins 31 decreases, and the fins 31 have a spiral shape, and the heat of the base portion 32 is conducted to the entire fins 31. By repeating this operation, the heat of the base portion 32 is efficiently radiated even if the number of the fins 31 is increased.

The dimming circuit 22, as shown in FIG.
An amplifier circuit 41 for inputting and amplifying an output signal of a television camera device 40 having the image pickup device 7 for converting an object image from an endoscope into an electric signal, and two inputs 1 for respectively inputting outputs of the amplifier circuit 41. Output switch circuits SW1, SW2
And an area designating circuit 43a for inputting the output of the switch circuit 42a and extracting the area other than the peripheral portion, and an area designating for inputting the output of the switch circuit 42b and extracting a section outside the area extracted by the area designating circuit 43a. Circuit 43
b, an integrating circuit 44a that integrates the output of the area designating circuit 43a, an integrating circuit 44b that integrates the output of the area designating circuit 43b, and an output of the integrating circuit 44a and a reference signal V1 via a switch SW3. Then, the comparison circuit 45a for outputting the difference to the diaphragm driving motor 18 and the output of the integrating circuit 43b and the reference signal V2 are switched by the switch SW.
4 and a comparison circuit 25b for outputting the difference to the drive motor 20.

The switch SW3 inputs the reference signal V1 and a position signal indicating the position of the diaphragm 16 output from the diaphragm position detecting means 19, selects one of them according to an input signal to the control terminal, and outputs it to the comparison circuit 45a. The switch SW4 outputs the reference signal V2 and the position signal indicating the position of the peripheral light amount controller 17 output from the peripheral light amount controller position detecting means 21, and selects one of them according to the input signal to the control terminal. Then, the data is output to the comparison circuit 45b.

As shown in FIG. 6, the panel substrate 23 is a panel sheet 51 attached to the surface of the light source device 10.
And a mode changeover switch 52 for switching between an automatic light control mode in which the video signal level output from the external TV camera 40 is kept constant and a manual light control mode in which the light amount is adjusted to a level set by the user, and the mode changeover. A display device 5 that performs automatic and manual switching sequentially according to the pressing of the switch 52 and performs automatic and manual display according to each
3, a light amount up switch 54a and a light amount down switch 54b for setting an increase / decrease in the total light amount during manual light control, the light amount up switch 54a and the light amount down switch 5
4b, a light quantity display 55 for indicating the light quantity level set by 4b, a peripheral light quantity up switch 56a and a peripheral light quantity down switch 56b for setting an increase or decrease of the peripheral light quantity during manual dimming, the peripheral light quantity up switch 56a and the peripheral light quantity down switch. The peripheral light amount display 57 indicates the peripheral light amount level set in 56b.

Returning to FIG. 5, a mode switching signal output in response to the pressing of the mode switching switch 52,
Light amount up switch 54a, light amount down switch 5
4b from the panel board 23 to the CPU 24, and a total light amount instruction signal output in response to the pressing of 4b and a peripheral light amount instruction signal output in response to the pressing of the peripheral light amount up switch 56a and the peripheral light amount down switch 56b. Is entered.

Further, the mode changeover switch 252
A display device drive signal for sequentially switching the display of the display device 53 from automatic to manual by counting the mode switching signals output by pressing, and the light amount up switch 54.
a, a light amount indicator drive signal for switching the lighting position of the light amount indicator 5 by counting the total light amount instruction signal output by pressing the light amount down switch 54b, the peripheral light amount up switch 56a, and the peripheral light amount down switch 56.
A peripheral light amount indicator drive signal for counting the peripheral light amount instruction signal output by pressing b and switching the lighting position of the peripheral light amount indicator 57 is output from the CPU 24 and input to the panel substrate 23.

The CPU 24 counts the mode switching signal output by pressing the mode switching switch 52, and the CPU 24 outputs a switching signal for performing automatic manual switching in accordance with the display of the display device 53 to output the switch SW1. , SW2, SW3, SW4
Input to the switching control terminal of.

The CPU 24 counts the light amount instruction signal output by pressing the light amount up switch 54a and the light amount down switch 54b, and the light amount display 55.
A signal having a level corresponding to the lighting position of, and a total light amount level signal are output to the input terminal at the other end of the switch SW1. Further, the CPU 24 uses the peripheral light amount up switch 5
6a, the peripheral light amount instruction signal output by pressing the peripheral light amount down switch 56b is counted, and a signal having a level corresponding to the lighting position of the peripheral light amount indicator 35 and a peripheral light amount level signal are output to the other end of the switch SW2. Output to the human power terminal.

The operation of the light source device of this embodiment having the above structure will be described.

When the user presses the mode switching switch 52 of the panel sheet 51 to switch from the manual dimming mode to the automatic dimming mode, the panel substrate 23 outputs a mode switching signal to the CPU 24 for one pulse.

The CPU 24 changes the display device drive signal to the panel substrate 23 from L to H, and switches the display of the display device 53 from manual to automatic. Further, the CPU 24 changes the switching signal from L to H, and switches SW1 and SW
20, the switch SW3 and the switch SW4 output to the control terminals, the switch circuit SW1 and the switch circuit SW2 select the output of the amplifier circuit 41, and the switch circuit SW3 and the switch circuit SW4 select the reference signals Vl and V2, respectively.

The image signal on the XY line of the image on the monitor as shown in FIG.
It becomes like (b). Then, as for the output signal of the television camera device 40 as shown in FIG. 7A amplified by the radiation increasing circuit 41, only the signal around the central portion of the screen on the television monitor is shown in FIG. 7D by the area designating circuit 43a. And is output to the integration circuit 44a.

Further, as for the output of the amplifier circuit 41, only the signal in the peripheral portion of the screen which is not extracted by the area designating circuit 43a is extracted by the area designating circuit 43b as shown in FIG. 7B and is output to the integrating circuit 44b.

As shown in FIG. 7C, the integrating circuit 44a
The output signal of the area designating circuit 43a, which has been integrated by, is compared with the reference signal V1 by the comparing circuit 45a.

In the comparison circuit 45a, when the difference is positive, that is, when the output signal of the integration circuit 44a is larger than the reference signal V1, the output of the comparison circuit 45a becomes a positive voltage, and the difference is negative, that is, the output signal of the integration circuit 44a is the reference. Signal V1
If it is smaller, the output of the comparison circuit 45a becomes a negative voltage.

When the output of the comparison circuit 45a is positive, the drive motor 18 operates the diaphragm 16 in the direction of decreasing the transmittance. If the output of the comparison circuit 45a is negative, the diaphragm driving motor 18 operates to increase the transmittance of the diaphragm 16. Therefore, the aperture 16 is controlled so that the output of the comparison circuit 45 becomes zero, and the television camera device 4
Observed at 0, the brightness near the center of the endoscopic screen is controlled to be constant.

The area designating circuit 42b extracts only the signals of the peripheral portion other than the area extracted by the area designating circuit 43a on the endoscope screen output from the amplifying circuit 41, and the integrating circuit 44b.
Output to b. The peripheral image signal is supplied to the integrating circuit 44b as shown in FIG.
As shown in (e), the integrated signal is input to the comparison circuit 45b, compared with the reference signal V2, and a signal corresponding to the difference is output to the drive motor 20.

When the output of the comparison circuit 45b is positive, the drive motor 20 moves the peripheral light amount controller 17 to the lamp side to increase the ratio of the peripheral light amount controller 17 to the luminous flux so that the peripheral portion of the endoscope screen is closed. Decrease brightness. When the output of the comparison circuit 45b is negative, the drive motor 20 moves the peripheral light amount controller 17 to the connector 15 side to reduce the ratio of the peripheral light amount controller 17 to the light flux to reduce the brightness of the peripheral portion of the endoscope screen. increase. In this way, the comparison circuit 45b
The peripheral light amount controller 17 is controlled so that the value becomes zero, and the brightness of the peripheral portion of the endoscope screen observed by the television camera device 40 is controlled to be constant.

Next, when the user presses the mode switch 52 of the panel sheet 51 to switch from the automatic light control mode to the manual light control mode, a mode switch signal is output from the panel board 23 to the 1-pulse CPU 244.

The CPU 24 changes the display device drive signal to the panel substrate 23 from H to L and switches the display of the display device 53 from automatic to manual. Further, the CPU 24 changes the switching signal from H to L and switches SW1, SW2,
Output to the control terminals of the switch circuits SW3 and SW4, and the switch circuits SW1 and SW2 are the CPU
The total light amount level signal and the peripheral light amount level signal output from 24 are selected respectively, and the switches SW3 and SW4 select the outputs of the aperture position detecting means 19 and the peripheral light amount controller position detecting means 21, respectively.

The user presses the light amount up switch 54a and the light amount down switch 54b in order to set the brightness of the central portion of the endoscope screen to the desired brightness. Light intensity up switch 54
a, the CPU 24 counts the total light amount instruction signal output according to the number of times the light amount down switch 54b is pressed, and a display device drive signal for turning on the light amount display 55 at the position corresponding to the desired light amount is transmitted from the CPU 24 to the panel board 23. To the switch SW1. The total light intensity level signal of the DC signal inversely proportional to the desired light intensity is output to the switch SW1. That is, when the user pushes the light amount up switch 54a to increase the brightness, the total light amount level signal decreases.

Since the total light amount level signal input to the area designating circuit 43a through the switch circuit SW1 is a DC signal as shown in FIG. 8A, the area designating circuit 43a is
Output signal is as shown in FIG. 8B, and the integration circuit 44a
The result is integrated by the equation, and the result is as shown in FIG. Integrating circuit 44a
Position detection means 19 via the output of the switch and the switch SW3
Is output by the comparison circuit 45a and is output according to the difference. When the output of the comparison circuit 45a is positive, that is, the user presses the light amount down switch 54b to decrease the brightness, the total light amount level signal increases, and the output of the diaphragm position detection means 19 exceeds the output of the integration circuit 44a. At this time, the aperture driving motor 18 operates in the direction of closing the aperture 16. Aperture 16
When the shutter is operated in the direction of narrowing, the output of the diaphragm position detection means 19 operates so as to rise.

As a result, the output level of the aperture position detecting means 19 approaches the output level of the integrating circuit 45a and works so that the difference becomes zero.

When the user pushes the light amount up switch 54a to increase the brightness, the total light amount level signal is lowered and the output level of the integrating circuit 44a is lowered.
The output level of 5a also decreases. The diaphragm driving motor 18 starts to operate the diaphragm 16 in the opening direction, and the diaphragm position detecting means 19
Output level will decrease. As a result, the diaphragm position detecting means 19
The output level of 1 approaches the output level of the integrating circuit 44a and operates so that the difference becomes zero.

Further, in order to make the brightness of the peripheral portion of the endoscope screen desired brightness, the peripheral light amount up switch 56 is used.
a, Press the peripheral light amount down switch 56b. A peripheral light amount instruction signal output according to the number of times the peripheral light amount up switch 56a and the peripheral light amount down switch 56b are pressed is output to the CPU.
24 counts and CPs the display device drive signal for turning on the peripheral light amount display 57 at a position corresponding to the desired peripheral light amount.
U24 outputs a peripheral light amount level signal of a DC signal inversely proportional to the desired peripheral light amount to the switch SW2. That is, when the user pushes the peripheral light amount up switch 56a to increase the peripheral brightness, the peripheral light amount level signal decreases.

Area designating circuit 4 via switch SW2
Since the peripheral light level signal input to 3b is a DC signal,
The output signal of the area designating circuit 43b is as shown in FIG. 8 (d) and is integrated by the integrating circuit 44b as shown in FIG. 8 (e). The output of the integrating circuit 44b and the output of the peripheral light amount controller position detecting means 21 via the switch SW4 are compared with each other by a comparing circuit 45b.
Compares and outputs according to the difference. When the output of the comparison circuit 45b is positive, that is, the user presses the peripheral light amount down switch 56b to reduce the brightness of the peripheral portion, the peripheral light amount level signal increases, and the output of the peripheral light amount controller position detection means 21 is integrated. When the output of the circuit 45b rises, the drive motor 20
Moves the peripheral light amount controller 17 in the lamp 2 direction. When the peripheral light amount controller 17 moves in the lamp 2 direction, the output of the peripheral light amount controller position detecting means 21 operates so as to rise.

As a result, the peripheral light amount controller position detecting means 2
The output level of 1 works so as to approach the output level of the integrating circuit 44b and the difference becomes zero.

When the user pushes the peripheral light amount up switch 56a to increase the brightness of the surroundings, the peripheral light amount level signal decreases and the output level of the integrating circuit 41 decreases, so that the output level of the comparing circuit 45b also decreases. . Drive motor 20
Starts moving the peripheral light amount controller 17 toward the connector 15, and the output level of the peripheral light amount controller position detecting means 21 decreases. As a result, the output level of the peripheral light amount controller position detecting means 21 approaches the output level of the integrating circuit 44b and operates so that the difference becomes zero.

As described above, according to the light source device for an endoscope of the present embodiment, one disk-shaped filter 4 which sequentially configures filters having different transmittances on the concentric circle is arranged in the emission path of the light source lamp 2. By moving the optical axis back and forth on the optical axis, the wall image of the peripheral area of the image can be seen even when the central part of the image is observed brightly when observing an endoscopic image, especially a tube-shaped object with a small inner diameter such as a blood vessel. A good image can be obtained without causing halation.

In the above embodiment, the area designating circuit 4
3A and the area designating circuit 43b may be replaced with a sample hold circuit instead of the extracting circuit acting as shown in FIGS.

Further, in the above-mentioned embodiment, the light control circuit was described as a light control circuit which controls the light based on the signal from the image pickup device of the television camera device, but the present invention is not limited to this, and the light control circuit is inserted like an electronic endoscope. It is possible to perform light control based on a signal from an image sensor provided at the tip of the unit.

Next, the second embodiment will be described. 9 to 13 relate to the second embodiment, FIG. 9 is a configuration diagram showing a configuration of an endoscope light beam device, and FIG. 10 is a configuration diagram showing a detailed configuration of the endoscope light beam device of FIG. 11 is an explanatory view for explaining the operation of the light control circuit of FIG. 10 in the automatic light control mode, FIG.
2 is an explanatory diagram for explaining the operation of the dimming circuit of FIG. 10 in the manual dimming mode, and FIG. 13 is an explanatory diagram for explaining changes in the intensity distribution of the illumination light in the manual dimming mode of FIG. .

The structure of the light source device of this embodiment is shown in FIG.
As shown in Fig. 9, a first peripheral light amount controller 17a (Fig. 9 (b)), which is installed between the diaphragm 16 and the lens 14 and whose transmittance changes on a concentric circle that controls the amount of ambient light of the illumination light,
The first drive motor 20 that moves the first peripheral light amount controller 17a back and forth in the optical axis direction, and the first drive motor 20 that is connected by a gear so that the drive shaft and the rotation shaft of the first drive motor 20 are interlocked with each other.
First peripheral light amount controller position detecting means 21 for detecting the position of the peripheral light amount controller 17a, and the first peripheral light amount controller position detecting means 21 as shown in FIG.
The outer and inner diameters are smaller than those of the peripheral light amount controller 17a, and the first peripheral light amount controller 1 for illumination light is installed closer to the light source lamp 2 than the position where the first peripheral light amount controller 17a is installed.
A second peripheral light amount controller 6 whose transmittance changes on a concentric circle that controls the light amount of the peripheral light inside the area where the light amount is controlled by 7a.
3 (FIG. 9C), a second drive motor 64 for moving the second peripheral light amount controller 63 back and forth in the optical axis direction, and the second
The drive motor 64 includes a second peripheral light amount controller position detecting means 65 for detecting the position of the second peripheral light amount controller 63 which is connected by a gear (not shown) so that the drive shaft and the rotary shaft of the drive motor 64 are interlocked.

As shown in FIG. 10, the dimming circuit of the second embodiment has the same circuit configuration as that for driving the diaphragm 16, so the other construction will be described.

An area designating circuit 71 for inputting the output of the switch SW2 and extracting an arbitrary area outside the extraction area of the area designating circuit 43a, and the area designating circuit 7.
Integrating circuit 72 for integrating the output of 1 and the integrating circuit 72
Of the reference signal V3 and the reference signal V3 and outputs the difference to the first drive motor 20, and the first peripheral light amount control output by the reference signal V3 and the first peripheral light amount controller position detection means 21. The switch SW5 for inputting a position signal indicating the position of the container 17a, selecting one of them according to the input signal to the control terminal and outputting it to the comparison circuit 73, and the output of the switch SW2 are input to the area designating circuit 71 for extraction. An area designating circuit 74 for extracting an area outside the area, an integrating circuit 75 for integrating the output of the area designating circuit 74, an output of the integrating circuit 75 and a reference signal V4 are input and compared, and the difference is the second drive. The comparison circuit 76 for outputting to the motor 64, the reference signal V4, and the position of the second peripheral light amount controller 63 output by the second peripheral light amount controller position detecting means 65 are compared. A switch SW6 outputs to enter the to the position signal to select either the input signal to the control terminal the comparator circuit 76, the mode selector switch 5
The mode switching signal output by pressing 2 is the C
A switching signal that the PU 24 counts and performs automatic / manual switching according to the display of the display device 53 is the CPU.
24 is output from the switch SW1, SW2, SW
5, input to the switch control terminal of SW6.

The CPU 24 counts the light amount instruction signal output by pressing the light amount up switch 54a and the light amount down switch 54b, and outputs the signal of the level corresponding to the lighting position of the light amount display 55 and the total light amount level signal. It outputs to the input terminal of the other end of the switch circuit SW1. The CPU 24 uses the peripheral light amount up switch 5
6a, a peripheral light amount instruction signal output by pressing the peripheral light amount down switch 56b is counted, and a signal of a level corresponding to the lighting position of the peripheral light amount indicator 57 and a peripheral light amount level signal are input terminals at the other end of the switch SW5. Output to.

The other structure is the same as that of the first embodiment.

The second embodiment constructed in this manner is shown in FIG.
0 and FIG. 11, when the user presses the mode selection switch 52 of the panel sheet 51 to switch from the manual dimming mode to the automatic dimming mode, the panel substrate 23
Outputs a mode switching signal to the CPU 24 for one pulse.

The CPU 24 changes the display device drive signal to the panel substrate 23 from L to H and switches the display of the display device 53 from manual to automatic. Further, the CPU 24 changes the switching signal from L to H and switches SW1, SW2, SW3,
Output to the control terminals of SW5 and SW6, and switch SW1,
SW2 selects the output of the amplifier circuit 41, and the switch SW
3, SW5 and SW6 are reference signals Vl, V3 and V, respectively.
Select 4.

Then, the output signal of the television camera device 40 amplified by the amplifier circuit 41 is extracted by the area designating circuit 43a only the signal around the central portion of the screen on the television monitor (not shown) and output to the integrating circuit 44a.

Further, the output of the amplifier circuit 41 is extracted by the area designating circuit 71 only the signal in the peripheral portion of the screen which is not extracted by the area designating circuit 43a and is output to the integrating circuit 72. The output signal of the area designating circuit 43a integrated by the integrating circuit 44a is compared with the reference signal Vl by the comparing circuit 45a. When the difference is positive, that is, when the output signal of the integrating circuit 44a is larger than the reference signal V1, the output of the comparison circuit 45a becomes a positive voltage, and when the difference is negative, that is, when the output signal of the integrating circuit 44a is smaller than the reference signal V1, the comparison circuit 45a outputs. The output is a negative voltage. When the output of the comparison circuit 45a is positive, the diaphragm driving motor 18 operates the diaphragm 16 in the direction in which the transmittance decreases (see FIGS. 11B and 11C). If the output of the comparison circuit 44a is negative, the diaphragm driving motor 18 operates to increase the transmittance of the diaphragm 16. Therefore, the aperture 16 is controlled so that the output of the comparison circuit 44a becomes zero, and the brightness near the central portion of the endoscope screen observed by the television camera device 40 is controlled to be constant.

The area designating circuit 71 extracts only the signal of an arbitrary area in the peripheral portion other than the area extracted by the area designating circuit 43a on the endoscope screen output from the amplifier circuit 41 as shown in FIG. 11A. And outputs it to the integration circuit 72.

The peripheral image signal is integrated by the integration circuit 72, input to the comparison circuit 73, compared with the reference signal V3, and the signal corresponding to the difference is output to the first drive motor 18. When the output of the comparison circuit 73 is positive, the first drive motor 18 receives the first
The peripheral light amount controller 17a is moved to the light source lamp 2 side to increase the ratio of the first peripheral light amount controller 17a to the light flux to reduce the brightness of the peripheral portion of the endoscope screen (FIG. 11).
(See (c) and (d)).

When the output of the comparison circuit 73 is negative, the first drive motor 18 moves the first peripheral light amount controller 17a to the connector 15 side to move the first peripheral light amount controller 17a for the luminous flux.
It reduces the ratio of the exposure and increases the brightness of the peripheral area of the endoscope screen.

As described above, the comparison circuit 73 is controlled to be zero, and the brightness of the peripheral portion of the endoscope screen observed by the television camera device 40 is controlled to be constant.

As shown in FIG. 11A, the area designating circuit 74 is located outside the arbitrary area of the peripheral portion extracted by the area designating circuit 71 on the endoscopic screen of the output of the amplifying circuit 41. Only the signal is extracted and output to the integrating circuit 75. The peripheral image signal is integrated by the integrating circuit 75, input to the comparing circuit 76, compared with the reference signal V4, and the signal corresponding to the difference is output to the second drive motor 64. When the output of the comparison circuit 76 is positive, the second drive motor 64 moves the second peripheral light amount controller 63 to the light source lamp 2 side to increase the ratio of the second peripheral light amount controller 63 to the light flux to make the endoscope. The brightness of the outermost peripheral portion of the screen is reduced (FIG. 11 (d) to (e)).

When the output of the comparison circuit 76 is negative, the second drive motor 64 connects the second peripheral light amount controller 63 to the connector 1
The ratio of the second peripheral light amount controller 63 to the light flux is reduced and the brightness of the outermost peripheral portion of the endoscope screen is increased.

In this way, the comparison circuit 76 is controlled to be zero, and the brightness of the outermost peripheral portion of the endoscope screen observed by the television camera device 40 is controlled to be constant.

Next, when the user presses the mode switching switch 52 of the panel sheet 51 to switch from the automatic dimming mode to the manual dimming mode, the panel substrate 23 outputs a mode switching signal to the CPU 24 for one pulse. C
The PU 24 changes the display device drive signal to the panel substrate 23 from H to L and switches the display of the display device 53 from automatic to manual.

Further, the CPU 24 changes the switching signal from H to L.
Switch SW1, SW2, SW3, SW5, S
Output to the control terminal of W6, switch SW1, switch S
W2 is a total light amount level signal output from the CPU 24,
Select the ambient light level signal and switch SW
3, switch SW5, and switch SW6 are aperture position detecting means 19 and first peripheral light amount controller position detecting means 2, respectively.
First, the output of the second peripheral light amount controller position detecting means 65 is selected. When the user presses the light amount up switch 54a and the light amount down switch 54b in order to set the brightness of the central portion of the endoscope screen to the desired brightness, the same operation as that of the first embodiment is performed, and the description thereof is omitted.

In order for the user to set the brightness of the peripheral portion of the endoscope screen to the desired brightness, the peripheral light amount up switch 55a,
Press the peripheral light amount down switch 55b. The CPU 24 outputs the peripheral light amount instruction signal output according to the number of times the peripheral light amount up switch 55a and the peripheral light amount down switch 55b are pressed.
CPU2 outputs a display device drive signal that counts and turns on the peripheral light amount display 57 at a position corresponding to the desired peripheral light amount.
4 to the panel substrate 23, and outputs the peripheral light amount level signal shown in FIG. 12 which is inversely proportional to the desired peripheral light amount to the switch SW2. That is, when the user presses the peripheral light amount down switch 55b to reduce the brightness of the surroundings, the peripheral light amount level signal is changed from the signal shown in FIG.
As shown in (b), the signal level of only the part corresponding to the area extracted by the area determining circuit 74 increases. The peripheral light amount level signal is a signal having a synchronizing signal like the video signal so that the area designating circuit 74 can accurately extract the signal.

When the user presses the peripheral light amount down switch 55b to reduce the brightness of the surrounding area, the peripheral light amount level signal is an area extracted by the area designating circuit 74 as shown in FIGS. 12 (a) to 12 (b). , The output level of the integration circuit 75 increases, and the output level of the comparison circuit 76 also increases.

The second drive motor 64 starts moving the second peripheral light amount controller 63 in the direction of the light source lamp 2, and the ratio of the second peripheral light amount controller 63 to the luminous flux increases, and the outermost peripheral light amount begins to decrease. Second peripheral light amount controller position detecting means 65
Output level increases. As a result, the output level of the second peripheral light amount controller position detecting means 65 approaches the output level of the integrating circuit 75 and operates so that the difference becomes zero.

Next, when the user pushes the peripheral light amount down switch 55b to further reduce the peripheral brightness by one level, the peripheral light amount level signal is changed to the area designating circuit as shown in FIGS. 12 (b) to 12 (c). The signal level of the area extracted by 71 increases. The output level of the result integration circuit 72 increases, and the output level of the comparison circuit 73 also increases. The 1st drive motor 20 starts moving the first peripheral light amount controller 17a in the direction of the light source lamp 2, and the first peripheral light amount controller 1 for the light flux.
The ratio of 7a increases, the peripheral light amount decreases, and the output level of the first peripheral light amount controller position detecting means 21 also decreases.

Result First peripheral light amount controller position detecting means 21
The output level of 1 approaches the output level of the integrating circuit 72 and operates so that the difference becomes zero.

FIG. 13 shows the transition of image brightness (brightness level when the monitor screen is cut along a horizontal line).
As shown in FIG. 13, first, when the light amount is lowered by one step, the brightness of the outermost peripheral portion is lowered as shown in FIGS. b) to Figure 1
As shown in 3 (c), the brightness of the entire peripheral part decreases. This operation is repeated to reduce the amount of peripheral light (FIG. 13 (d),
(E)). On the contrary, when the peripheral light amount is increased, the operation reverse to the above is performed.

As described above, according to the second embodiment, two disk-shaped filters, which are concentrically arranged in order of filters having different transmittances, are arranged in the light source lamp emission path so that they can be moved back and forth on the optical axis. Therefore, when observing an endoscopic image, especially a tube-shaped object with a small inner diameter such as a blood vessel, when the central part of the image is brightly observed, the wall image of the peripheral part of the image does not cause halation, and the brightness of the peripheral part of the image is also high. You can fine-tune.

In the above embodiment, the area designating circuit 4
Even if the 3a, the area defining circuit 71, and the area designating circuit 74 are replaced by the sample and hold circuits instead of the extracting circuits that operate as shown in FIGS. 7, 8, and 11, the same effect can be obtained.

By the way, since the light guide (hereinafter, LG) which receives the illumination light has a problem that it is heated to a high temperature by the illumination light to cause LG burn and the user is burned when the LG is removed, these are prevented. In order to do so, the LG cooling device as shown below can be provided in the above embodiment.

As shown in FIG. 14, such an LG cooling device is composed of a heat sink 101 made of an aluminum material or the like provided on the outer periphery of the LG 100 of the mounted endoscope. Radiating fins 102 for improving the heat radiation effect are provided.

Inside the heat sink 101, a plurality of pole blocks 103 made of a magnetic material are provided as shown in the figure. FIG. 14 shows a state in which the LG 100 is inserted into the output connector 15 of the light source device 10. In this case, the permanent magnet 99 forms a magnetic path as shown by a broken line in the figure. Since the magnetic fluid 104 has a property of being strongly attracted to a stronger magnetic field, at the same time as being attracted to the tip of the pole block 103, the magnetic fluid 104 also comes into close contact with the LG 100.

Here, the magnetic fluid 104 is obtained by uniformly dissolving ultrafine particles of a magnetic material in the sea surface active material, and has good thermal conductivity.

Illumination light from the light source lamp 2 of the light source device 10 is incident on the incident end face of the LG 100 via the optical system 12. The incident light is extremely intense, and the outer peripheral portion of the LG 100 becomes extremely hot.

The heat generated on the outer peripheral portion of the LG 100 is conducted to the heat sink 101 via the magnetic fluid 104.
The light source device 10 has a built-in cooling fan 105,
The heat sink 101 is forcibly cooled.
Note that, in FIG. 14, the ratio of the portion A is shown small in the figure, but by increasing the ratio of the portion A, heat conduction to the heat sink 101 can be improved.

The state when the LG100 is removed is shown in FIG.
Shown in. Since the magnetic fluid 104 is attracted to the tip of the pole block 103 as described above, the magnetic fluid 104
Stays in the groove of the pole block 103. LG
When the 100 is removed, the magnetic fluid 104 becomes LG100.
It does not occur that the toner adheres to and comes out of the light source device 10 together with the LG 100.

Incidentally, in such an LG cooling device,
Although the heat radiation fins 102 are provided on the heat sink 101 to forcibly cool them by the cooling fan 105, naturally it is also possible to adopt natural air cooling and no cooling fan.

A first modification of the LG cooling device is shown in FIG.
As shown in FIG. 6, the heat pipe 110 is connected to the heat sink 101 described in FIG. Heat pipe 110
The other end is fixedly coupled to a second heat sink 111 provided outside the box body of the light source device 10 by a fixture 112.

The heat generated in LG 100 is the magnetic fluid 104.
The heat conducted to the heat sink 101 via the heat pipe 101 is efficiently transmitted to the second heat sink 111 via the heat pipe 110. The heat generated inside the box of the light source device 10 is applied to the heat pipe 11
When 0, the temperature rises inside the light source device 10, and the second heat sink 111 provided outside the box body is cooled by the outside air.

In order to prevent the heat of the heat pipe 110 and the second heat sink 111 from being conducted to the box body and raising the temperature of the box body itself, the fixing tool 112 should be made of resin having low heat conduction. Is desirable.

A second modification of the LG cooling device is shown in FIG.
As shown in FIG. 7, the connector 15 is the LG100 of the endoscope.
The tip portion has a shape that can be inserted, and the LG 100 tip portion projects from the connector 15 toward the lens 14. The sensor support member 120 is provided on the end surface of the connector 15 on the lens 14 side.
Is provided, and a temperature sensor 121 for measuring the temperature of the LG 100 tip portion is provided therein. The temperature sensor 121 is connected to the measuring circuit 122. On the other hand, the judging circuit 123 has a function of judging whether or not the temperature measured by the measuring circuit 122 is equal to or higher than a preset temperature.
The compressor 124 follows the instruction of the determination circuit 123,
It has a function of blowing compressed air to the tip of LG100.

When the tip of the LG100 is inserted into the connector 15 and the light source lamp 2 is turned on, the lens 14 collects the light of the light source lamp 2 and makes it enter the fiber fiber (not shown) at the tip of the LG100. At this time, not all the light is incident and transmitted effectively, so that the temperature of the tip portion of the LG 100 rises. Temperature sensor 121 and measurement circuit 122
Measures this temperature. Then, the compressor 124 is operated only when the judgment circuit 123 judges that the temperature is higher than a certain temperature. Since the compressor 124 applies compressed air to the tip of the LG 100, the temperature drops. If the temperature sensor 121 detects a temperature below a certain temperature, the compressor 124 stops its operation.

As a third modification of the LG cooling device, FIG.
As shown in FIG. 8, a cylindrical heat sink 130 is provided instead of the sensor support member 120 in the second modification. An embedded temperature sensor 131 is provided at the contact portion between the heat sink 130 and the tip of the LG 100. Other configurations are the same as those of the second modification.

Therefore, the compressed air of the compressor 124 cools the heat sink 130, so that the tip of the LG 100 is cooled uniformly.

As a fourth modification of the LG cooling device, as shown in FIG. 19, the LG of the second modification is used.
An LG 140 with a temperature sensor is provided instead of the tip of 100. A signal from the sensor 141 of the LG 140 with a temperature sensor is considered to be transmitted to the connector 15 side through the contact pin 142. Contact pin 1 on connector 15
A contact spring 143 is provided at a position corresponding to 42 and is connected to the measurement circuit 122. Other configurations are the same as those of the second modification.

The LG with temperature sensor 140 senses the temperature rise by itself, and the information is input to the measuring circuit 122 through the contact pin 142 and the contact spring 143.
140 is cooled with compressed air only when needed.

On the other hand, as shown in FIG. 20, the light source lamp 2
Has an anode side electrode 2a and a cathode side electrode 2b. Each electrode is fixed to the heat sink 150. The heat sink 150 has a role of supplying electricity to each electrode and a role of radiating heat from the light source lamp 2. Generally, the anode side electrode 2a is strongly contacted with the heat sink 150 by a screw, but the cathode side electrode 2b has a substantially cylindrical outer shape and the heat sink 150 having substantially the same shape from the outside.
It is only sandwiched between. This cylindrical shape is generally somewhat distorted.

Therefore, in each of the above-described embodiments, as shown in FIG. 21, the flanged adapter 151 having an inner diameter substantially the same as the outer shape of the cathode side electrode 2b is tapered in its outer shape. The corresponding tightening ring 153 is also taper threaded. FIG. 22
As shown in FIG. 1, one or more notches 155 are provided on the cylindrical surface of the flanged adapter 151. Further, the flange portion is provided with a surface capable of making strong contact with the heat sink 150 and a screw hole 157 for fixing. Returning to FIG. 21, the flanged adapter 151 and the tightening ring 1
The elastic member 1 having good thermal conductivity is provided between the taper screws 53.
59 is provided. The flanged adapter 151 and the heat sink 150 are screwed through the screw holes 157.
It is strong and has a good thermal conductivity.

The flanged adapter 151 is attached to the elastic member 1
When tightened with the tightening ring 153 via 59, the elastic member 159 is worn out, but since the taper screw is cut off, the inner surface of the cylinder of the flanged adapter 151 is strongly contacted with the outer shape of the cathode side electrode 2b. Even if the outer shape of the cathode side electrode 2b is slightly distorted, the inner surface of the flanged adapter 151 is in full contact due to the action of the elastic member 159.
Therefore, the heat generated at the cathode side electrode 2b is easily transferred to the flanged adapter 151. After that, heat is efficiently transmitted to the heat sink 150 through the flange portion.

A modified example of the flanged adapter 151 will be described. 23 and 24 show the shape of each component, and FIG. 25 shows the shape when combined.

As a modification, the flanged adapter 151 in FIG. 22 is replaced with a flange 170 having a similar notch 155, and the tightening ring 153 is replaced with a tightening band 171 having a variable inner diameter.

By strongly tightening the tightening band 171, the inner surface of the flange 170 and the outer shape of the cathode side electrode 2b can be brought into close contact with each other.

[0096]

As described above, according to the light source device for an endoscope of the present invention, since the disc-shaped filter is moved back and forth along the optical path by the driving means, the illumination light incident on the optical transmission means is There is an effect that the intensity can be adjusted and the illumination light having the optimum intensity distribution can be supplied to the endoscope.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a conceptual configuration of a light source device for an endoscope according to a first embodiment.

FIG. 2 is an explanatory diagram illustrating a schematic operation of a light source device of the endoscope of FIG.

3 is a configuration diagram showing a detailed configuration of a light source device of the endoscope of FIG.

4 is a configuration diagram showing a configuration of the heat sink of FIG.

5 is a configuration diagram showing a configuration of the light control circuit of FIG.

6 is a configuration diagram showing a configuration of the panel substrate of FIG.

FIG. 7 is an explanatory diagram illustrating the operation of the light control circuit of FIG. 5 in the automatic light control mode.

FIG. 8 is an explanatory diagram illustrating the operation of the dimming circuit of FIG. 5 in the manual dimming mode.

FIG. 9 is a configuration diagram showing a configuration of a light beam device for an endoscope according to a second embodiment.

FIG. 10 is a configuration diagram showing a detailed configuration of a light beam device of the endoscope of FIG.

FIG. 11 is an explanatory diagram illustrating the operation of the light control circuit of FIG. 10 in the automatic light control mode.

FIG. 12 is an explanatory diagram illustrating the operation of the light control circuit of FIG. 10 in the manual light control mode.

FIG. 13 is an explanatory diagram illustrating changes in the intensity distribution of illumination light in the manual light control mode of FIG.

FIG. 14 is a configuration diagram showing a configuration of an LG cooling device provided in a light source device of an endoscope.

15 is an explanatory diagram illustrating a state in which a light guide is removed from the LG cooling device of FIG.

FIG. 16 is a configuration diagram showing a configuration of a first modified example of the LG cooling device.

FIG. 17 is a configuration diagram showing a configuration of a second modified example of the LG cooling device.

FIG. 18 is a configuration diagram showing a configuration of a third modified example of the LG cooling device.

FIG. 19 is a configuration diagram showing a configuration of a fourth modified example of the LG cooling device.

FIG. 20 is an explanatory diagram illustrating a connection state between a light source lamp and a heat sink.

FIG. 21 is an explanatory view for explaining the connection between the cathode side electrode of the light source lamp and the heat sink.

FIG. 22 is an external view illustrating the shape of the flanged adapter of FIG. 21.

FIG. 23 is a configuration diagram showing a configuration of a heat sink used in a modification of the connecting means for connecting the cathode side electrode of the light source lamp and the heat sink.

FIG. 24 is a configuration diagram showing a configuration of a tightening band and a flange used in a modified example of the connecting means between the cathode side electrode of the light source lamp and the heat sink.

FIG. 25 is an explanatory diagram for explaining an assembled state of the heat sink of FIG. 23, the tightening band and the flange of FIG.

[Explanation of symbols]

 2 ... Light source lamp 3 ... Aperture means 4 ... Filter 5 ... Driving means 8 ... Peripheral light amount detecting means 9 ... Comparison means 16 ... Aperture 17 ... Peripheral light amount controller 19 ... Aperture position detecting means 21 ... Peripheral light amount controller position detecting means 22 ... dimming circuit 23 ... panel substrate 24 ... CPU

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[Procedure amendment]

[Submission date] June 7, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

The dimming circuit 22, as shown in FIG.
An amplifier circuit 41 for inputting and amplifying an output signal of a television camera device 40 having the image pickup device 7 for converting an object image from an endoscope into an electric signal, and two inputs 1 for respectively inputting outputs of the amplifier circuit 41. Output switches SW1 and SW2,
An area designating circuit 43a for inputting the output of the switch SW1 and extracting the area other than the peripheral portion; and an area designating circuit 43b for receiving the output of the switch SW2 and extracting a section outside the area extracted by the area designating circuit 43a. An integrating circuit 44a for integrating the output of the area designating circuit 43a
An integrating circuit 44b for integrating the output of the area designating circuit 43b, an output of the integrating circuit 44a and a reference signal V1.
Are compared via the switch SW3 and the difference is output to the aperture drive motor 18, and the output of the integration circuit 43b and the reference signal V2 are compared via the switch SW4 and the difference is output to the drive motor 20. Comparing circuit 2
5b and.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

As shown in FIG. 6, the panel substrate 23 is a panel sheet 51 attached to the surface of the light source device 10.
And a mode changeover switch 52 for switching between an automatic light control mode in which the video signal level output from the external TV camera 40 is kept constant and a manual light control mode in which the light amount is adjusted to a level set by the user, and the mode changeover. A display device 5 that performs automatic and manual switching sequentially according to the pressing of the switch 52 and performs automatic and manual display according to each
3, a light amount up switch 54a and a light amount down switch 54b for setting an increase / decrease in the total light amount during manual light control, the light amount up switch 54a and the light amount down switch 5
A light quantity indicator 55 for indicating the amount of light level set in 4b, a peripheral light amount up switch 56a and a peripheral light amount down switch 56b for setting the increase or decrease in the peripheral light amount during manual dimming, the peripheral light amount up switch 56a and the peripheral light amount Downs
A peripheral light amount display 57 indicating the peripheral light amount level set by the switch 56b .

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

The CPU 24 changes the display device drive signal to the panel substrate 23 from L to H, and switches the display of the display device 53 from manual to automatic. Further, the CPU 24 changes the switching signal from L to H, and switches SW1 and SW
2 , and outputs to the control terminals of the switch SW3 and the switch SW4, the switches SW1 and SW2 select the output of the amplifier circuit 41, and the switches SW3 and SW4 select the reference signals Vl and V2, respectively.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

The area designating circuit 43b extracts only the signals of the peripheral portion other than the area extracted by the area designating circuit 43a on the endoscope screen output from the amplifying circuit 41, and the integrating circuit 44.
Output to b. The peripheral image signal is supplied to the integrating circuit 44b as shown in FIG.
As shown in (e), the integrated signal is input to the comparison circuit 45b, compared with the reference signal V2, and a signal corresponding to the difference is output to the drive motor 20.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction content]

The CPU 24 changes the display device drive signal to the panel substrate 23 from H to L and switches the display of the display device 53 from automatic to manual. Further, the CPU 24 changes the switching signal from H to L and switches SW1, SW2,
Output to the control terminals of the switches SW3 and SW4,
The switches SW1 and SW2 select the total light amount level signal and the peripheral light amount level signal output from the CPU 24, respectively, and the switches SW3 and SW4 select the outputs of the aperture position detecting means 19 and the peripheral light amount controller position detecting means 21, respectively. To do.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

Area designating circuit 4 via switch SW1
Since the total light amount level signal input to 3a is a DC signal as shown in FIG. 8A, the output signal of the area designating circuit 43a becomes as shown in FIG. 8B, integrated by the integrating circuit 44a, and It becomes like 8 (c). The comparison circuit 45a compares the output of the integration circuit 44a with the output of the aperture position detection means 19 via the switch SW3, and outputs the comparison result according to the difference. When the output of the comparison circuit 45a is positive, that is, the user presses the light amount down switch 54b to decrease the brightness, the total light amount level signal increases, and the output of the diaphragm position detection means 19 exceeds the output of the integration circuit 44a. At this time, the aperture driving motor 18 operates in the direction of closing the aperture 16. When the diaphragm 16 operates in the direction of narrowing, the output of the diaphragm position detection means 19 operates so as to rise.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction content]

The CPU 24 counts the light amount instruction signal output by pressing the light amount up switch 54a and the light amount down switch 54b, and outputs the signal of the level corresponding to the lighting position of the light amount display 55 and the total light amount level signal. Output to the input terminal at the other end of the switch SW1 .
The CPU 24 uses the peripheral light amount up switch 56.
a, a peripheral light amount instruction signal output by pressing the peripheral light amount down switch 56b is counted, and a signal of a level corresponding to the lighting position of the peripheral light amount indicator 57 and a peripheral light amount level signal are input terminals at the other end of the switch SW5. Output to.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0065

[Correction method] Change

[Correction content]

In order for the user to set the brightness of the peripheral portion of the endoscope screen to the desired brightness, the peripheral light amount up switch 56a,
Press the peripheral light amount down switch 56b . Increased peripheral light intensity
The CPU 24 outputs the peripheral light amount instruction signal output according to the number of times the switch 56a and the peripheral light amount down switch 56b are pressed.
CPU2 outputs a display device drive signal that counts and turns on the peripheral light amount display 57 at a position corresponding to the desired peripheral light amount.
4 to the panel substrate 23, and outputs the peripheral light amount level signal shown in FIG. 12 which is inversely proportional to the desired peripheral light amount to the switch SW2. That is, when the user presses the peripheral light amount down switch 55b to reduce the brightness of the surroundings, the peripheral light amount level signal is changed from the signal shown in FIG.
As shown in (b), the signal level of only the part corresponding to the area extracted by the area determining circuit 74 increases. The peripheral light amount level signal is a signal having a synchronizing signal like the video signal so that the area designating circuit 74 can accurately extract the signal.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0066

[Correction method] Change

[Correction content]

When the user presses the peripheral light amount down switch 55b to reduce the brightness of the surroundings, the peripheral light amount level signal is extracted by the area designating circuit 74 as shown in FIGS. 12 (a) to 12 (b). Since the signal level of the area increases, the output level of the integration circuit 75 also increases and the output level of the comparison circuit 76 also increases.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0068

[Correction method] Change

[Correction content]

Next, when the user pushes the peripheral light amount down switch 55b to lower the peripheral brightness by another level, the peripheral light amount level signal is set to the area designation as shown in FIGS. 12 (b) to 12 (c). The signal level of the area extracted by the circuit 71 increases. The output level of the result integration circuit 72 increases, and the output level of the comparison circuit 73 also increases. The 1st drive motor 20 starts moving the first peripheral light amount controller 17a in the direction of the light source lamp 2, and the first peripheral light amount controller 1 for the light flux.
The ratio of 7a increases, the peripheral light amount decreases, and the output level of the first peripheral light amount controller position detecting means 21 also decreases.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0077

[Correction method] Change

[Correction content]

The illumination light from the light source lamp 2 of the light source device 10 is incident on the incident end face of the LG 100 via the optical system 14 . The incident light is extremely intense, and the outer peripheral portion of the LG 100 becomes extremely hot.

[Procedure Amendment 12]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

[Procedure Amendment 13]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 14

[Correction method] Change

[Correction content]

FIG. 14

Claims (1)

[Claims] 1. A light source lamp for supplying illuminating light, a mounting means for mounting the incident part of the light transmitting means for transmitting the illuminating light which is inserted through an endoscope, and the mounting means. Optical means for condensing the illumination light on the incident end surface of the light transmitting means mounted on the optical means, provided on the optical paths of the incident end surfaces of the optical means and the optical transmitting means, and movable along the optical path, One or more disc-shaped filters in which a plurality of concentric regions having different transmission characteristics are sequentially formed in the radial direction, and a drive unit for moving the disc-shaped filters back and forth along the optical path. A light source device for an endoscope.