JP3401184B2 - Light source device - Google Patents

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 supplying illumination light to a light guide such as an endoscope.

[0002]

2. Description of the Related Art In recent years, endoscopes have been widely used in medical fields and industrial fields. This endoscope is provided with a light guide for transmitting illumination light. The light guide is connected to the endoscope light source device, and the light emitted from the lamp in the endoscope light source device is transmitted by the light guide. Then
It illuminates the affected area by emitting from the end face of the endoscope on the tip side,
The affected area and the like illuminated by an observation optical system or the like attached to the observation window can be observed.

When a high-intensity lamp such as a xenon lamp is used as a lamp in a light source device for an endoscope, an endoscope using a light guide that is weak against heat must be used unless the light amount of the high-intensity lamp is limited or dimmed. In some cases, the light guide may be deteriorated by heat or burned out.

Therefore, in a conventional endoscope light source device, for example, as in Japanese Patent Publication No. 5-10649, frosted glass or mesh that reduces the amount of light incident on the light guide due to heat problems at the end surface of the light guide or the like. Dimming was done with filters.

[0005]

However, since the light-reducing means such as the mesh filter and the diaphragm blade for light adjustment are inserted in the optical path from the lamp to the light guide, the optical path length becomes long. Was there. Therefore, it has been difficult to reduce the size and cost of the light source device.

(Object of the Invention) The present invention has been made in view of the above-mentioned points, and according to the resistance of the connected light guide without providing a light-reducing mesh filter, frosted glass or the like in the optical path. An object of the present invention is to provide a light source device capable of dimming, downsizing, and cost reduction.

[0007]

A first light source according to the present invention
The device consists of a lamp that produces the light used for the illumination light,
A light guide that receives and transmits the light from the lamp,
A light guide that determines the type of light guide to be installed
Injecting light into the light guide from the discrimination means and the lamp
Light amount adjusting means for adjusting the amount of light to be emitted, and the light amount adjusting means
Drive means for outputting a drive signal for driving
A dimming control that outputs a dimming signal that serves as a reference for driving the driving means.
Control means and the maximum allowable light amount of the light guide is not exceeded
To limit the amount of light that enters the light guide
Light amount limiting means for outputting a limiting signal, and the dimming control means
And the light control output from the light amount limiting means, respectively.
Signal, the light quantity limiting signal, and the light guide determination means
Based on the discrimination result output from
Select the dimming signal or the light amount limiting signal for
And a signal switching means for dynamically switching.
And In addition, the second light source device according to the present invention is an illumination light source.
A lamp for generating light used for
A light guide that receives and transmits light and a liner
Light guide discriminating means for discriminating the type of guide
Adjust the amount of light entering the light guide from the lamp
Light amount adjusting means for driving the light amount adjusting means
Driving means for outputting the driving signal of
Control means for outputting a light control signal, and the light guide
Based on the discrimination result by the discriminating means,
The amount of light incident on the window is less than the maximum allowable light amount of the light guide.
A light quantity control for outputting the following light quantity limiting signal to the drive means
And a limiting means.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 and 2 relate to a first embodiment of the present invention, and FIG. 1 shows an endoscope apparatus equipped with a light source device for an endoscope of the first embodiment. FIG. 2 shows the overall configuration, and FIG. 2 shows how the amount of passing light is adjusted by the rotation of the diaphragm blades.

As shown in FIG. 1, an endoscope apparatus 1 includes an endoscope light source apparatus 2 for supplying illumination light to a television camera-equipped endoscope 2 and a light guide 12 of the television camera-equipped endoscope 2 (hereinafter referred to as a light source apparatus). , Abbreviated as a light source device) 3A, and an image pickup element 7 built in the television camera 2B of the television camera mounted endoscope 2.
A camera control unit (abbreviated as CCU) 5 for performing signal processing for the above and a monitor 6 for displaying a corresponding endoscopic image by inputting a video signal output from the CCU 5.

The television camera mounted endoscope 2 comprises an optical endoscope 2A and a television camera 2B mounted on the optical endoscope 2A and having an image pickup element 7 built therein. Optical endoscope 2
A has an elongated insertion portion 8, a grip portion 9 provided at the rear end side and gripped by an operator, and an eyepiece portion 11 provided at the rear end of the grip portion 9. A television camera 2B is detachably attached to the camera 11.

The light guide 12 inserted through the insertion portion 8
Is further inserted through the light guide cable 13 connected near the grip portion, and the incident side end portion thereof is detachably connected to the light source device 3.

A lamp 15 that emits light used as illumination light is provided in the light source device 3A of the first embodiment.
Power supply circuit 16 as driving means for causing the lamp 15 to emit light
Light is emitted by a lighting current (also referred to as a drive signal because the lamp 15 is driven to emit light) and emits white light.

The lamp 15 is, for example, a xenon lamp, emits light with high brightness, and aperture blades 17 are arranged on the optical path of the emitted light. Light passing through the aperture blades 17 is emitted to the light source device 3A. It is supplied as illumination light to the incident side end of the light guide 12 at the position on the optical path (when connected).

This illuminating light is transmitted by the light guide 12, is emitted to the subject 18 side from the illumination window at the tip of the insertion portion 8 whose tip is fixed, and illuminates the subject 18. The illuminated subject 18 is imaged by an objective lens (not shown) attached to the observation window adjacent to the illumination window, and the image is transmitted to the eyepiece 11 side by a relay optical system or the like and imaged on the image sensor 7. .

The signal photoelectrically converted by the image pickup device 7 is C
It is input to the CU 5, converted into a standard video signal, and the subject image in the body cavity is displayed as an endoscopic image on the display surface of the monitor 6. Further, the CCU 5 generates a dimming signal corresponding to the brightness of the captured image by integrating the luminance signal for one frame period, and outputs the dimming signal to the light source device 3A.

The light source device 3A automatically controls (automatically adjusts) the amount of illumination light supplied from the light source device 3A to the light guide 12 using this dimming signal to observe the endoscopic image displayed on the monitor 6. Maintain suitable brightness. In this case, the maximum light amount of the illumination light amount supplied to the light guide that is actually connected to the light source device 3A (the light guide 12 of the television camera mounted endoscope 2 or the like) is supplied to the light guide according to the type of the light guide. The guide is set within the tolerance range.

More specifically, in the present embodiment, when two types of light guides, a high-luminance mode compatible light guide and a normal mode compatible light guide, are connected to the light source device 3A, the light guide type detection means 28 causes The type of the connected light guide is identified, and the amount of light incident on or supplied to the light guide in accordance with the identified light guide is set within the tolerance range of the light guide.

Next, the light source device 3A having such a function
The specific configuration of will be described. The dimming signal is used as the light source device 3
A reference voltage set by a reference current flowing through the resistance value set by the variable resistor R1 is applied to one input terminal A of the divider 21 in A and the other input terminal B. The divider 21 performs A / B division, and the output signal is applied to the contact a of the first switch 22 and one input end of the first comparator 23.

The common contact of the first switch 22 is connected to the input end of the diaphragm driver 24.
The diaphragm blade 17 (drive motor of the diaphragm blade) connected to the output end of the diaphragm blade is rotated to block the light flux on the optical path at the light shielding portion of the diaphragm blade 17 so that the passing light amount can be variably adjusted. In this case, when the contact a is ON, the diaphragm blade 17 is rotationally driven so that the dimming signal matches the reference voltage based on the reference current determined by the variable resistor R1.

FIG. 2 shows the diaphragm blade 17 and the range of motion in which it rotates. As shown in FIG. 2, the aperture blade 17 has its base end rotated by a motor (not shown), and the aperture blade main body portion at the end via an arm extending from the base end has a disc-shaped light-shielding portion with a wedge-shaped notch. The wedge-shaped cutout portion is provided so that the amount of light passing therethrough can be varied.

By rotating the base end of the diaphragm blade 17, it is possible to move in an operating range from a rotation angle position (also simply referred to as position) A to position B so as to traverse the optical path in an arc shape. I have to.

In this case, the luminous flux from the lamp 15 is at the position shown by the dotted line, for example, so that when the diaphragm blade 17 is set at the position C near the center of the operating range of FIG. Only the amount of light is the diaphragm blade 17
The illumination light amount is supplied to the light guide 12 after passing through the notch.

At this position C, the light quantity is suitable for the light guide compatible with the normal mode, and is within the light quantity range which is allowable for the durability of the light guide compatible with the normal mode. Specifically, as will be described later, the amount of light is about 1/2 when the diaphragm blade 17 is set to the position B and the amount of light supplied to the light guide 12 is maximum.

When the position B is set lower than the position C in FIG. 2, the light beam from the lamp 15 is not blocked by the diaphragm blade 17 and is supplied to the light guide 12 in the fully open position.

Further, in the state where the position A is set above the position C in FIG.
Then, the light guide 12 is completely blocked, and the light guide 12 is in the fully closed position where the illumination light is not supplied.

In the present embodiment, when the light guide compatible with the high-brightness mode is connected, the dimming is performed while the diaphragm blade 17 is rotatable from the fully closed position to the fully open position, and the light guide compatible with the normal mode is provided. Is connected, the dimming is performed with the diaphragm blade 17 being rotatable from the fully closed position to a predetermined position. The high-brightness mode compatible light guide has resistance to the maximum light amount when the diaphragm blade 17 is incident at the fully open position. An angular position detection sensor such as an encoder is attached to the motor that rotates the diaphragm blade 17, and this sensor outputs a diaphragm position signal S whose level changes according to the angular position. Then, as described later, when the light is adjusted by the light guide compatible with the normal mode, the diaphragm blade 17 is moved to the position C using the diaphragm position signal S.
A means for detecting that the position has been reached and fixing it at this position C is formed.

As shown in FIG. 1, the first switch 22 is
A voltage of a reference level obtained by dividing the voltage V by the resistors R2 and R3 is applied to the other contact b. This reference level is a value that is set at the position C in FIG. 2 when the diaphragm blades 17 are driven by this voltage through the diaphragm driver 24. This position C is the position where the maximum amount of light is allowed to be incident (or supplied) in the normal mode compatible light guide.

A voltage of a reference level obtained by dividing the voltage V by the resistors R4 and R5 is applied to the other input terminal of the first comparator 23, and the reference level detects the value of 1 when the output of the divider 21 is 1. Is set to the level for the first
The comparator 23 applies a signal output when the output of the divider 21 becomes greater than 1 to the latch circuit 25, and the latch circuit 25 updates the latch output which is input from its input end and latched and output. .

The output signal of the second comparator 26 is input to the input terminal of the latch circuit 25. The voltage V is applied to resistors R6 and R7 at one input terminal of the second comparator 26.
The reference level voltage divided by is applied. This reference level is also a level corresponding to the position C in FIG. Further, the diaphragm blade 1 is provided at the other input end of the second comparator 26.
The diaphragm position signal S provided at 7 is applied.

The output signal of the latch circuit 25 controls ON / OFF of the first switch 22 via the second switch 27. In addition, ON / O of this second switch 27
The FF is controlled by the output signal of the light guide type detecting means 28 which detects the type of the light guide 12.

The light guide type detecting means 28 has a structure such that when a high brightness mode compatible light guide is connected to the light source device 3A, a light shielding plate provided in the light guide connecting portion of the light source device 3A moves. This plate detects the light by blocking the light from the photo interrupter. When a normal mode compatible light guide other than the high brightness mode compatible light guide is connected to the light source device 3A, the light of the photo interrupter is not blocked.

The light guide type detecting means 28 turns off the second switch 27 when the light guide corresponding to the high brightness mode is connected. In this case, the output level of the second switch 27 is pulled up to "H" by the resistor R, for example, and the contact a of the first switch 22 is turned on.

Further, the light guide type detecting means 28 is the second when the light guide corresponding to the normal mode is connected.
The switch 27 is turned on, and in this case, the contact a or the contact b of the first switch 22 is turned on according to the output of the latch circuit 25.

Next, the operation of this embodiment will be described.

When the light guide corresponding to the high brightness mode is connected, the light guide type detecting means 28 detects the connection of the light guide corresponding to the high brightness mode, and the second switch 27 is turned off.

At this time, the contact a side of the first switch 22 is always selected, and the dimming signal passed through the divider 21 drives the diaphragm blade 17 via the diaphragm driver 24. This allows
Since the diaphragm blade 17 operates so that the magnitude of the dimming signal becomes equal to the reference current determined by the resistor R1,
Automatic light control will be performed.

At this time, since the limiting operation is not added to the drive signal of the diaphragm blade 17, the diaphragm blade 17 is fully closed (see FIG. 2).
From the position A) to the fully open position (position B in FIG. 2), automatic light control is performed.

With the above operation, when the light guide compatible with the high brightness mode is connected, the diaphragm blade 17 operates between fully closed and fully opened, so that automatic light control is performed using the entire range of the emitted light amount from the minimum to the maximum. Will be seen.

Next, when the normal mode compatible light guide is connected, the connection of the normal mode compatible light guide is detected by the light guide type detection means 28, and the second switch 27 is turned on.

At this time, the first switch 22 is operated by the latch circuit 2
With the output of 5, the contact a or b is selected. A range (AC in FIG. 2) in which the diaphragm position signal S does not exceed the reference voltage (position C in FIG. 2) determined by the resistors R6 and R7.
When the automatic light control is performed during (between), the operation is the same as when the light guide corresponding to the high brightness mode is connected.

However, when the aperture position signal S exceeds the reference voltage determined by the resistors R6 and R7 due to the object 18 moving away (that is, the aperture blade 17 is placed between BC in FIG. 2).
Is input), the comparator 26 latches the latch circuit 2
The signal output to 5 changes (specifically, it is inverted from “H” to “L”), and the output of the latch circuit 25 is a signal to turn on the contact b of the first switch 22 via the second switch 27. Keep issuing.

This state is maintained until the release signal is input from the first comparator 23 to the latch circuit 25. When the first switch 22 is connected to the contact b, the diaphragm blade 17 is forcibly fixed to the diaphragm position (position C in FIG. 2) determined by the resistors R2 and R3. The position C in FIG. 2 is set to be the maximum light amount position of the light guide corresponding to the normal mode.

Next, when the distance to the subject 18 approaches while the aperture blade 17 is forcibly fixed, the dimming signal becomes larger than the reference current determined by the resistor R1, so that the output of the divider 21 becomes It becomes larger than "1".

The first comparator 23 detects that the output of the divider 21 becomes larger than "1" and inputs it to the latch circuit 25, so that the latch circuit 25 contacts the switch 22 via the second switch 27. A signal is continuously output so that a turns on. As a result, the operation again starts to perform automatic light control between the ACs in FIG. The above operation is repeated as long as the light guide compatible with the normal mode is connected.

With the above operation, when the light guide compatible with the normal mode is connected, automatic light control is performed within the applicable light amount of the light guide compatible with the normal mode (between ACs in FIG. 2), and the ground glass for darkening and the mesh filter are used. Since the light guide function is provided without using, the light guide compatible with the normal mode can be used without causing burnout or the like. In this case, it can be realized by an electronic circuit that can be realized at low cost and small size, and the cost and the size can be reduced.

Therefore, this embodiment has the following effects. When the light guide corresponding to the high brightness mode is connected, the second switch 27 is turned off and the diaphragm blade 17 is always driven by the output of the divider 21. Therefore, the operation of the diaphragm blade 17 is not limited, and the minimum to maximum light amount is used. Dimming is performed.

When the light guide corresponding to the normal mode is connected, the second switch 27 is turned on, and when the position of the diaphragm blade 17 exceeds the position determined by the resistors R6 and R7, the diaphragm blade 17 is restricted from opening further. When the dimming signal becomes brighter than the target brightness determined by the resistor R1, the restriction on the diaphragm blade 17 is released.

Therefore, the aperture blades 17 can be prevented from being opened beyond the position determined by the resistors R6 and R7, so that the same function as that of the conventional frosted frosted glass or the mesh filter is electrically realized. Therefore, the size and cost can be reduced.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The light source device 3B of the second embodiment constituting the endoscope device 1 shown in FIG. 3 is provided with a dimming circuit 31 in the light source device 3A of FIG. 1, and this dimming circuit 31 has a dimming signal and a voltage. A reference current in which V is limited by the resistor R8 is input.

The output signal of the dimming circuit 31 is input to the adder 32, and the other input terminal of the adder 32 is connected to a common contact of a changeover switch 33 as an offset changing means. A reference voltage obtained by dividing the voltage V by the resistors R9 and R10 is applied to the contact a of the changeover switch 33, and the other contact b is connected to the ground.

Further, the contact for turning on the changeover switch 33 is selected by the light guide type detecting means 28, and when it is detected that the light guide corresponding to the high brightness mode is connected, the contact b is turned on and corresponds to the normal mode. When it is detected that the light guide is connected, the contact a is turned on. Other configurations are the same as those described with reference to FIG. 1, and the same components are designated by the same reference numerals and the description thereof will be omitted.

Next, the operation of this embodiment will be described. When the high-brightness mode compatible light guide is connected, the light guide type detection means 28 detects the connection of the high-brightness mode compatible light guide, and selects the contact b of the changeover switch 33 to be turned on.

As a result, in the adder 32, nothing is added to the drive signal generated based on the reference current of the resistor R8 and the dimming signal from the CCU 5, and the drive signal directly drives the diaphragm blade 17. Become. As a result, the resistance R
Since the diaphragm blade 17 operates so that the reference current determined by 8 and the magnitude of the dimming signal become equal, automatic dimming is performed.

With the above operation, when the light guide compatible with the high-brightness mode is connected, the diaphragm blades 17 operate between fully open and fully closed, so that the automatic light control is performed using the entire range of the emitted light amount from the minimum to the maximum. Will be performed.

Next, when the normal mode compatible light guide is connected, the connection of the normal mode compatible light guide is detected by the light guide type detection means 28, and the contact a of the changeover switch 33 is selected.

As a result, the resistors R9 and R are applied to the drive signal.
Since the offset for the voltage determined by 10 is always added, the diaphragm blade 17 operates at a voltage higher than the voltage determined by R9 and R10.

Since the voltage determined by R9 and R10 is set to the position C in FIG. 2, the operating range of the diaphragm blade 17 is between AC in FIG.

With the above operation, when the light guide corresponding to the normal mode is connected, the automatic light control is performed within the applied light amount of the light guide corresponding to the normal mode (between AC in FIG. 2). Also in this embodiment, when the light guide compatible with the normal mode is connected, automatic light control is performed within the amount of light applied to the light guide compatible with the normal mode, so that the dimming function is realized without using the frosted frosted glass or mesh filter. Therefore, cost reduction and size reduction can be achieved.

Therefore, the present embodiment has the following effects. When the light guide corresponding to the high brightness mode is connected, the changeover switch 33 as the offset changeover means selects the contact b, so that nothing is added to the drive signal for light control, and the aperture blade 17 is driven by the drive signal as it is.
Accordingly, the operation of the diaphragm blade 17 is not limited, and the dimming using the minimum to maximum light amount is performed.

When the light guide compatible with the normal mode is connected,
The changeover switch 33 selects the contact a side, and the resistors R9 and R1 are selected.
The voltage component determined by 0 is added to the drive signal. The voltage determined by the resistors R9 and R10 is set so as to maximize the emission in the normal mode. Therefore, since the diaphragm blades 17 are not opened to the drive signal more than the maximum emitted light amount in the normal mode, it is possible to realize a function similar to that of using the conventional dimming frosted glass or the mesh filter.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. The light source device 3C of the third embodiment constituting the endoscope device 1 shown in FIG. 4 is the same as the light source device 3B of FIG. 3 except that the diaphragm blade 17 is not provided and the output of the adder 32 is applied to the power supply circuit 16. Then, the drive power (drive signal) or the lamp lighting current that determines the amount of light emitted from the power supply circuit 16 to the lamp 15 is controlled to adjust the amount of light supplied to the light guide 12.

In this case, from the adder 32 to the power supply circuit 1
When the level applied to 6 increases, the driving power supplied from the power supply circuit to the lamp 15 decreases and the amount of light emission decreases. The other configurations are the same as those in the second embodiment.

Next, the operation of this embodiment will be described. When the light guide corresponding to the high brightness mode is connected, the light guide type detecting means 28 detects the connection of the light guide corresponding to the high brightness mode, and selects the contact b of the changeover switch 33 as the offset changing means to be turned on. To be done.

As a result, in the adder 32, nothing is added to the drive current generated based on the reference current of the resistor R8 and the dimming signal from the CCU 5, and the drive signal directly controls the lamp drive power. Become. As a result, the drive current of the lamp 15 is adjusted so that the reference current determined by the resistor R8 becomes equal to the magnitude of the dimming signal, so that automatic dimming is performed.

With the above operation, when the light guide compatible with the high-brightness mode is connected, the lamp 15 operates between the maximum power and the minimum power of the lamp 15. Therefore, automatic light control is performed using the entire range of the emitted light amount from the minimum to the maximum. Will be performed.

Next, when the normal mode compatible light guide is connected, the connection of the normal mode compatible light guide is detected by the light guide type detecting means 28, and the contact a of the changeover switch 28 is selected.

As a result, the resistors R9 and R are applied to the drive signal.
Since the offset for the voltage determined by 10 is always added, the driving power of the lamp 15 is the resistance R9, R
It operates at a power less than that determined by 10.

For example, when the power determined by R9 and R10 is set to 50% of the maximum power, the drive power of the lamp 15 is automatically dimmed within the range of 50% or less of the maximum drive power. . With the above operation, when the light guide compatible with the normal mode is connected, the automatic light control is performed within the applied light amount of the light guide compatible with the normal mode.

This embodiment has the following effects. When the light guide corresponding to the high brightness mode is connected, the changeover switch 33 as the offset changeover means selects the contact b, so that nothing is added to the drive signal for dimming and the lamp drive power is directly controlled by the drive signal. As a result, the lamp driving power is not limited, and the dimming using the minimum to maximum light amount is performed.

When the light guide compatible with the normal mode is connected,
Select the contact a of the changeover switch 33 to select the resistors R9 and R10.
Is added to the drive signal. The voltage determined by the resistors R9 and R10 is set to be the maximum amount of emitted light in the normal mode.
Therefore, the driving power of the lamp 15 is limited so as not to exceed the maximum emitted light amount in the normal mode, and thus it is possible to realize a function similar to that of using the conventional dimming frosted glass or the mesh filter. The lamp of the present invention can be applied to a xenon lamp, a short arc lamp such as a metal halide, a halogen lamp, or the like.

[Additional Notes] 1. A lamp that emits light used for illumination light; a light amount adjustment means that adjusts the amount of light that is generated from the lamp and is supplied to the light guide; a light guide determination means that determines the type of the connected light guide; Based on the drive circuit for driving the light quantity adjusting means based on the dimming signal for illuminating and the output of the light guide discriminating means, the light quantity supplied to the connected light guide is limited to the allowable light quantity range. And a control circuit for controlling the drive circuit as described above. 2. When the connected light guide is a normal mode compatible light guide, the light amount adjusting means determines that the connected light guide is a high brightness mode compatible light guide as a result of the determination by the light guide determining means. The light source device according to appendix 1, wherein the amount of light supplied to the end surface of the light guide is adjusted within an allowable light amount range.

3. The light source device according to appendix 1, wherein the control circuit controls the drive circuit so as to limit the maximum amount of light supplied to the connected light guide according to the resistance of the connected light guide. . 4. The control circuit has a switching circuit for switching between a case where a maximum light amount supplied to the light guide is limited and a case where it is not based on the determination result of the light guide determination means. Light source device.

5. The control circuit includes a first comparator that compares a signal value based on a dimming signal with a preset first reference value, and an output value of the light amount adjusting means and a preset second reference value. Appendix 1 characterized in that it has a latch circuit for outputting a control signal for controlling the drive circuit according to an output of a second comparator for comparing The light source device according to any one of claims 1 to 4. 6. The light source according to appendix 5, wherein the first comparator compares an output of a divider that calculates an output level of a dimming signal with respect to a predetermined reference current with the first reference value. apparatus.

7. 5. The light source device according to any one of appendices 1 to 4, wherein the control circuit has an offset circuit that applies a limiting operation to a drive signal of the light amount adjusting means based on a reference value preset by a connected light guide. . 8. 7. The light source device according to appendices 1 to 6, wherein the light amount adjusting means is a diaphragm mechanism interposed in an optical path from the lamp to a connected light guide. 9. 8. The light source device according to appendix 7, wherein the light amount adjusting means controls the driving power supplied to the lamp and determines the light emission amount of the lamp. 10. 8. The light source device according to appendix 7, wherein the drive circuit is an adder that adds the output signal of the offset circuit to a dimming signal and outputs the added signal to the dimming control means.

11. A lamp for generating light used for illumination light, a light guide for injecting and transmitting light from the lamp, a discriminating means for discriminating the type of the mounted light guide, and an amount of light incident on the light guide. Light amount adjusting means for adjusting the light amount, driving means for outputting a driving signal for driving the light amount adjusting means, dimming control means for outputting a dimming signal serving as a reference for driving the driving means, and the light guide Light quantity limiting means for outputting a light quantity limiting signal for limiting the quantity of light incident on the light guide so as not to exceed the maximum allowable light quantity, and the dimming control means and the light quantity limiting signal from the light quantity controlling means And a switching means for selectively switching the dimming signal or the light quantity limiting signal to the light quantity adjusting means based on the input from the discriminating means. Light source device according to. 12. A lamp that generates light used for illumination light, a light guide that receives and transmits the light from the lamp, a light amount adjustment unit that adjusts the amount of light that is incident on the light guide from the lamp, and the light amount adjustment Drive means for outputting a drive signal for driving the means, dimming control means for outputting a dimming signal to the drive means, discriminating means for discriminating the type of the light guide to be mounted, and the discriminating means. Based on the determination result by, the light amount limiting means for outputting to the drive means a light amount limiting signal for making the maximum light amount incident on the light guide equal to or less than the allowable maximum light amount of the light guide,
A light source device comprising:

13. The driving means outputs a drive signal for driving the light quantity adjusting means based on the dimming control signal from the dimming control means, and a light quantity limiting signal for the drive signal. 13. The light source device according to appendix 12, further comprising: an addition unit capable of inputting a drive signal obtained by adding the light amount adjustment unit to the light amount adjustment unit. 14. 14. The light source device according to appendix 13, wherein the light amount adjusting unit is a power control unit that controls drive power of the lamp.

[0077] According to the present invention described above, even when the light guide is connected to the actual different, without providing a ground glass or the like for dimming in the optical path, the light guide of resistance to be connected The light can be adjusted accordingly, which enables downsizing and cost reduction.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an endoscope device including a light source device for an endoscope according to a first embodiment of the present invention.

FIG. 2 is a diagram showing how the amount of light passing through is adjusted by rotating a diaphragm blade.

FIG. 3 is an overall configuration diagram of an endoscope device including a second embodiment of the present invention.

FIG. 4 is an overall configuration diagram of an endoscope device including a third embodiment of the present invention.

[Explanation of symbols]

1 ... Endoscopic device 2 ... Endoscope with TV camera 3A ... Light source device 5 ... CCU 6 ... Monitor 7 ... Image sensor 8 ... insertion part 12 ... Light guide 15 ... Lamp 16 ... Power supply circuit 17 ... Aperture blade 18 ... Subject 21 ... Divider 22 ... First switch 23 ... Comparator 24 ... Aperture driver 25 ... Latch circuit 26 ... Comparator 28 ... Light guide type detecting means

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02B 23/26 A61B 1/06 G02B 23/24 A61B 1/04 A61B 1/04 370

Claims (2)

(57) [Claims] 1. A lamp for generating light used as illumination light, and a light guide for injecting and transmitting the light from the lamp.
And a light guide that determines the type of light guide to be installed
The amount of light that enters the light guide from the lamp and the determination means is adjusted.
And a drive signal for driving the light amount adjusting means for adjusting the light amount adjusting means.
Driving means and a dimming signal for outputting a dimming signal serving as a reference for driving the driving means.
The light control means and the light guide so as not to exceed the maximum allowable light amount of the light guide.
A light amount limiting signal that limits the amount of light entering the light guide
The light amount limiting means for outputting, the dimming control means and the light amount limiting means respectively output.
The dimming signal and the light amount limiting signal which are applied to the light.
Based on the determination result output from the guide determination means,
The dimming signal or the light for the light quantity adjusting means.
A light source device , comprising: a signal switching unit that selectively switches the amount limiting signal . 2. A lamp for generating light used for illumination light, and a light guide for injecting and transmitting the light from the lamp.
And a light guide that determines the type of light guide to be installed
The amount of light that enters the light guide from the lamp and the determination means is adjusted.
And a drive signal for driving the light amount adjusting means for adjusting the light amount adjusting means.
Driving means and dimming control means for outputting a dimming signal to the driving means
And based on the discrimination result by the light guide discriminating means,
The amount of light incident on the light guide
A light quantity limiting signal that is less than or equal to the maximum allowable light quantity
A light source device comprising: a light amount limiting unit for outputting .