JP2010158415A - Light source apparatus for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source apparatus for an endoscope for adjusting light emitting quantity considering the fluctuation of the light emitting quantity of light emitting member themselves in an endoscope system using light emitted from the plurality of light emitting members with different colors as a light source. <P>SOLUTION: The endoscope system has the light source part 22 having the plurality of light emitting members (first to third LEDs 22a to 22c) emitting lights with different colors and in which the lights emitted from the plurality of light emitting members are used as illumination lights for obtaining endoscope images. The endoscope system has a light receiving part 26 for receiving the lights emitted from the plurality of light emitting members and not used as the illumination lights. The endoscope system has a drive part 21 for controlling the driving quantity of the plurality of light emitting members on the basis of the information relating to the light emitting quantity of the plurality of light emitting members from the right receiving part 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an endoscope light source device, and more particularly to a light source device that adjusts the amount of emitted light.

  An endoscope system has been proposed in which a first LED that emits red light, a second LED that emits green light, and a third LED that emits blue light are used as light sources that emit white light.

  Patent Document 1 discloses an endoscope system that adjusts the amount of light emitted from first to third LEDs based on a color signal obtained by imaging a white object with an imaging device.

JP 2002-122794 A

  However, since the driving amount determined at the time of adjustment using a white object is fixedly used in the apparatus of Patent Document 1, the variation in the amount of emitted light of the first to third LEDs itself generated after adjustment such as temperature change is taken into consideration. Not. In order to take account of such fluctuations, it is necessary to make such adjustments on a regular basis, but during that time normal observation is not possible.

  Therefore, an object of the present invention is to provide an apparatus that adjusts the amount of emitted light in consideration of fluctuations in the amount of emitted light of the light emitting member itself in an endoscope system that uses light emitted from a plurality of light emitting members of different colors as a light source. Is to provide.

  The endoscope light source device according to the present invention includes a plurality of light emitting members that emit light of different colors, and light emitted from the plurality of light emitting members is used as illumination light for obtaining an endoscopic image. A plurality of light sources based on information on a light source unit, a light receiving unit that receives light emitted from a plurality of light emitting members and is not used as illumination light, and information on the amount of light emitted from the plurality of light emitting members from the light receiving unit And a drive unit that adjusts the drive amount of the member.

  Based on the light from the light emitting member received by the light receiving unit, information on the amount of light emitted from the light emitting member is obtained. Since the variation factors of the emitted light amount are limited to those caused by the light emitting member itself, such as a temperature change, the driving amount of each light emitting member can be accurately adjusted in consideration of the variation of the emitted light amount of the light emitting member itself. It becomes possible to adjust the amount of emitted light. Even if the light emitted from the light emitting member is not in a stable state, such as immediately after the power is turned on, the emitted light quantity can be adjusted by receiving the emitted light quantity in this state by the light receiving unit. Therefore, the adjustment of the quantity of emitted light can be completed quickly. Further, since a light receiving unit different from the image sensor used for obtaining an endoscopic image is used, normal endoscopic observation can be performed in parallel with the drive amount adjustment.

  Preferably, the driving unit adjusts the driving amounts of the plurality of light emitting members so that the color temperature of light emitted from the light source unit as illumination light is constant.

  By adjusting the amount of light emitted from each light emitting member, it is possible to maintain the output of each emission color constant and to maintain the color temperature of light emitted from the light source unit constant.

  Preferably, the light source unit includes first to third light emitting members as a plurality of light emitting members, the light receiving unit receives light emitted from the first to third light emitting members, and the drive unit includes: The driving amount of the first light emitting member is adjusted based on the information on the amount of light emitted from the first light emitting member from the light receiving unit, and the second light emitting member is adjusted based on the information on the amount of light emitted from the second light emitting member from the light receiving unit. The drive amount is adjusted, and the drive amount of the third light emitting member is adjusted based on information related to the amount of light emitted from the light emitting unit from the light receiving unit.

  More preferably, the first light emitting member is turned on while the first light emitting member is turned on and the second and third light emitting members are turned off during the first readout period of the imaging device used to obtain the endoscopic image. The driving amount of the second light emitting member is adjusted in a state where the second light emitting member is turned on and the first and third light emitting members are turned off during the second reading period different from the first reading period. The third light emitting member is turned on during the third reading period different from the first and second reading periods, and the driving amount of the third light emitting member is turned off while the first and second light emitting members are turned off. The light receiving unit receives the light emitted from the first light emitting member, receives the light emitted from the second light emitting member, and emits the light from the third light emitting member using a common light receiving element. Receive light.

  At the time of adjusting the emitted light amount of the first to third light emitting members, since the light emitting members other than the light emitting member to be adjusted are turned off, the emitted light amount of the light emitting member to be adjusted can be accurately measured. In addition, since such measurement is performed during the readout period of the image sensor, the endoscope image is not affected. In addition, since the emitted light amount of the first to third light emitting members can be adjusted using a common light receiving element, accurate adjustment is possible without being affected by individual differences of the light receiving elements.

  As described above, according to the present invention, in an endoscope system using light emitted from a plurality of light emitting members of different colors as a light source, the emitted light amount is adjusted in consideration of fluctuations in the emitted light amount of the light emitting member itself. An apparatus can be provided.

It is a lineblock diagram of an endoscope system in this embodiment. It is a block diagram of the LED driver in this embodiment. It is a timing chart of emitted light quantity adjustment.

  Hereinafter, the configuration of the endoscope system according to the present embodiment will be described with reference to the drawings. The endoscope system 1 according to the present embodiment includes a scope 10, an image processor 20, and a monitor 40 (see FIG. 1).

  The scope 10 has an imaging unit 11 in an insertion portion which is a flexible tube inserted into a patient's body, and is connected to an image processing processor (image processing device) 20 by performing various operations while the operator holds it by hand. And a light guide 12 that carries light from the image processor 20 from the connecting portion to the distal end of the insertion portion. The imaging unit 11 includes an imaging element and a circuit that controls the imaging element.

  The image processing processor 20 includes an LED driver 21, a light source unit 22, an insulation circuit 23, a first image processing unit 24, a light receiving unit 26, a second image processing unit 27, a control unit 28, and an operation unit 29. In the image processor 20, predetermined image processing for generating an image that can be displayed on the monitor 40 is performed on the image signal acquired by the scope 10.

  A monitor 40 is connected to the image processor 20. The monitor 40 is a display unit that displays an image that has been subjected to image processing by the image processor 20 and conforms to a predetermined video signal standard. In addition to the monitor 40, the image processor 20 may be connected to an external storage device that records image data processed by the image processor 20, a printer that outputs (prints out) an image, and the like.

  Next, the detail of each part is demonstrated. The light guide 12 inserted through the scope 10 and made up of a large number of optical fibers for guiding illumination light is irradiated with light from the light source unit 22 in the image processor 20 as illumination light. The light source unit 22 includes a first LED 22a for red light emission, a second LED 22b for green light emission, and a third LED 22c for blue light emission. When the first to third LEDs 22a to 22c emit light, the light source unit 22 White light is emitted toward the guide 12 and the light receiving unit 26.

  In order to adjust the amount of light emitted from the light source unit 22, the light from the light source unit 22 is irradiated toward the light guide 12 and also toward the light receiving unit 26 provided in the vicinity of the light source unit 22. . Details of the adjustment of the amount of light emitted from the light source unit 22 will be described later together with the details of the LED driver 21.

  Reflected light from the object to be observed is incident on the image sensor of the imaging unit 11 via an objective optical system (not shown), and the optical image of the object to be observed is photoelectrically converted by the image sensor and based on the optical image. An image signal is output. The image signal output from the imaging unit 11 is amplified and then sent to the first image processing unit 24 of the image processor via the insulation circuit 23, and the image signal processing of the previous stage such as white balance adjustment and YC separation is performed. Is done. The insulation circuit 23 is a circuit for protecting the patient from an electric shock or the like.

  In the second image processing unit 27, subsequent image signal processing such as amplification processing, gamma correction, and contour enhancement is performed and stored as image data in an image memory (not shown) provided in the second image processing unit 27. . The image data in the image memory provided in the second image processing unit 27 is read out in a timely manner, subjected to video signal processing conforming to a predetermined video signal specification, and output to the monitor 40. As a result, the observed object image is displayed on the monitor 40.

  The control unit 28 is a microprocessor or the like that controls each unit of the scope 10 and the image processor 20. The operation unit 29 is an operation key for setting usage conditions of each unit. By operating the operation unit 29, the amount of light emitted from the light source unit 22 is also adjusted.

  Next, the details of the adjustment of the emitted light amount of the light source unit 22, that is, the details of the adjustment of the emitted light amount of the first to third LEDs 22 a to 22 c will be described together with the details of the LED driver 21. The first to third LEDs 22 a to 22 c are driven by the LED driver 21 controlled by the control unit 28. The adjustment of the driving amount of the first to third LEDs 22a to 22c (for example, the current value in the case of current driving, the duty ratio in the case of pulse driving) adjusts the light receiving unit 26 that measures the amount of light emitted from the first to third LEDs 22a to 22c, And the LED driver 21.

  The LED driver 21 includes a reference voltage variable unit 21a, a comparator 21b, first to third sample and hold circuits 21c1 to 21c3, first to third LED drive circuits 21d1 to 21d3, and an I / V conversion unit 21e (FIG. 2). reference).

  The reference voltage variable unit 21a compares any one of the first to third reference voltage values V1 to V3 calculated corresponding to the emission light amount setting value of the light source unit 22 set by the operation unit 29 by the user. Output to the positive terminal. The first to third reference voltage values V1 to V3 are calculated from the relationship between the output light amount setting value of the light source unit 22, the output current value of the light receiving unit 26, and the output voltage value of the I / V conversion unit 21e. An instruction signal corresponding to the light emission amount setting value of the light source unit 22 set by the user through the operation unit 29 is output from the control unit 28 to the reference voltage variable unit 21a. In response to the instruction signal, the reference voltage varying unit 21a includes first to third so that the ratio of the intensity of red emitted from the first LED 22a, green emitted from the second LED 22b, and blue emitted from the third LED 22c is constant. Reference voltage values V1 to V3 are calculated.

  The first reference voltage value V1 is used when adjusting the emitted light amount of the first LED 22a emitting red, and the second reference voltage value V2 is used when adjusting the emitted light amount of the second LED 22b emitting green. The reference voltage value V3 is used when adjusting the amount of light emitted from the third LED 22c that emits blue light. The adjustment of the emitted light amount of the first to third LEDs 22a to 22c is performed by adjusting the emitted light amount corresponding to the emitted light amount setting value set by the user for the white light emitted from the light source unit 22, and the color temperature of the white light is constant. The first to third LEDs 22a to 22c are caused to emit light. In other words, the first to third LEDs 22a to 22c are caused to emit light so that the ratio of the intensity of red emitted from the first LED 22a, green emitted from the second LED 22b, and blue emitted from the third LED 22c is constant.

The adjustment of the emitted light amount of the first to third LEDs 22a to 22c is performed by switching every reading period of the image sensor. Specifically, the readout duration imaging device (first readout period R1, the reference time point _t 11 _{~t 18} in FIG. 3), the first reference voltage value V1 from the reference voltage varying unit 21a has a positive comparator 21b The amount of light emitted from the first LED 22a is adjusted by being output to the terminal. During this time, the control unit 28 controls the first sample hold circuit 21c1 and the first LED drive circuit 21d1 to turn on the first LED 22a, but turns off the second and third LEDs 22b and 22c. Next reading period from the reference voltage varying unit 21a second reference voltage value V2 (V2 <V1) is the positive terminal of the comparator 21b (second reading period R2, the reference time point _t 21 _{~t 28} in FIG. 3) The output light amount of the second LED 22b is adjusted. During this time, the control unit 28 controls the second sample and hold circuit 21c2 and the second LED drive circuit 21d2 to turn on the second LED 22b, but turns off the first and third LEDs 22a and 22c. Next readout period, the reference voltage varying unit 21a from the third reference voltage value V3 (V3> V1) is the positive terminal of the comparator 21b (third reading period R3, refer to the time point _t 31 _{~t 38} in FIG. 3) The output light amount of the third LED 22c is adjusted. During this time, the control unit 28 controls the third sample and hold circuit 21c3 and the third LED drive circuit 21d3 to turn on the third LED 22c, but turns off the first and second LEDs 22a and 22b. Similarly, the emission light amount adjustment of the first LED 22a, the emission light amount adjustment of the second LED 22b, and the third LED 22c are performed for each readout period.

  At the time of adjusting the emitted light amount of the first to third LEDs 22a to 22c, only the LED to be adjusted is turned on, the other two LEDs are turned off, and light of a color different from the white light is emitted from the light source unit 22. The adjustment is performed during the readout period of the image sensor, and the charge accumulated in the image sensor during the readout period is discharged by the electronic shutter before the start of the next exposure period. ) Is not affected.

  The light receiving unit 26 has one light receiving element, and the light receiving element receives light from the first to third LEDs 22 a to 22 c that is not used as illumination light toward the light guide 12. The light receiving unit 26 outputs a current proportional to the amount of light received by the light receiving element to the I / V conversion unit 21e. The I / V conversion unit 21e converts the current (light reception current value) output from the light receiving unit 26 into a voltage (light reception voltage value) and applies it to the negative terminal of the comparator 21b (inputs the light reception voltage value). .

  In the case of pulse driving, the first to third LED driving circuits 21d1 to 21d3 have the predetermined duty ratio based on the output voltages of the first to third sample hold circuits 21c1 to 21c3, and the first to third LEDs 22a to 22c. And the I / V conversion unit 21e integrates the pulse signal output from the light receiving unit 26 and converts it to a light reception voltage value.

  The comparator 21b compares any one of the first to third reference voltage values V1 to V3 input to the plus terminal with the received light voltage value input to the minus terminal, and converts the binarized signal to the first to third samples. It outputs to the hold circuits 21c1 to 21c3. The comparator 21b outputs a Low signal when the received light voltage value is lower than any of the first to third reference voltage values V1 to V3, and outputs a High signal when it is higher.

First sample-and-hold circuit 21c1 is between time _t 14 _{~t 15} in the first readout period R1 for performing emission light quantity adjustment of the 1LED22a, is in the sample mode, the other is in the hold mode. During the sample mode, the High signal or Low signal output from the comparator 21b is output to the first LED drive circuit 21d1 via the first sample hold circuit 21c1.

  The first LED drive circuit 21d1 drives the first LED 22a to emit light based on a control signal from the control unit 28. While the first sample hold circuit 21c1 is in the sample mode, the first LED drive circuit 21d1 adjusts the drive amount supplied to the first LED 22a based on the High signal or Low signal output from the comparator 21b. In this state, the first LED 22a is driven. Specifically, when the output from the comparator 21b is a high signal, the first LED drive circuit 21d1 decreases the drive amount supplied to the first LED 22a to reduce the amount of light emitted from the first LED 22a, and when the output is a low signal, the first LED 22a. The amount of light emitted from the first LED 22a is increased by increasing the drive amount supplied to the first LED 22a.

The second sample-and-hold circuit 21c2 is between time _t 24 _{~t 25} in the second readout period R2 of performing light emission amount adjustment of the 2LED22b, is in the sample mode, the other is in the hold mode. During the sample mode, the High signal or Low signal output from the comparator 21b is output to the second LED drive circuit 21d2 via the second sample hold circuit 21c2.

  The second LED drive circuit 21d2 drives the second LED 22b to emit light based on a control signal from the control unit 28. While the second sample hold circuit 21c2 is in the sample mode, the second LED drive circuit 21d2 adjusts the drive amount supplied to the second LED 22b based on the High signal or Low signal output from the comparator 21b. In this state, the second LED 22b is driven. Specifically, when the output from the comparator 21b is a high signal, the second LED drive circuit 21d2 reduces the drive amount supplied to the second LED 22b to reduce the amount of light emitted from the second LED 22b, and when the output is a low signal, the second LED 22b. The amount of light emitted from the second LED 22b is increased by increasing the drive amount supplied to the second LED 22b.

The third sample and hold circuit 21c3 is between time _t 34 _{~t 35} in the third reading period R3 of performing light emission amount adjustment of the 3LED22c, is in the sample mode, the other is in the hold mode. During the sample mode, the High signal or Low signal output from the comparator 21b is output to the third LED drive circuit 21d3 via the third sample hold circuit 21c3.

  The third LED drive circuit 21d3 drives the third LED 22c to emit light based on a control signal from the control unit 28. While the third sample hold circuit 21c3 is in the sample mode, the third LED drive circuit 21d3 adjusts the drive amount supplied to the third LED 22c based on the High signal or Low signal output from the comparator 21b. In this state, the third LED 22c is driven. Specifically, when the output from the comparator 21b is a high signal, the third LED drive circuit 21d3 decreases the drive amount supplied to the third LED 22c to reduce the amount of light emitted from the third LED 22c, and when the output is a low signal, the third LED 22c. The amount of light emitted from the third LED 22c is increased by increasing the drive amount supplied to the LED.

The procedure for adjusting the amount of light emitted from the light source unit 22 will be described with reference to the timing chart of FIG. From the output time of the readout pulse of the image sensor (time _{t 11),} the first readout period R1 is started, until after completion discharged charges by the electronic shutter of the exposure period immediately preceding (time _{t 18),} the emission light intensity of the 1LED22a Adjustments are made.

At _{t 12,} the 2LED22b, the first 3LED22c off, only the 1LED22a is in the lighting state. That is, the 2LED22b, between time _{t 16} to the 3LED22c is made to light up again, the light source unit 22 emits the red light. Further, the reference current voltage value output from the reference voltage variable unit 21a to the comparator 21b is changed from the third reference current voltage value V3 to the first reference voltage value V1. After the reference voltage varying unit 21a at the time _{t 13} to the first reference voltage value V1 is to be outputted at the time _{t 14,} the first sample-and-hold circuit 21c1 is from the hold mode to the sample mode, until the time _{t 15} During a certain period of time, red light emission by the first LED 22a, light reception by the light receiving unit 26, comparison with the first reference voltage value V1 by the comparator 21b, and the drive amount based on the High signal or Low signal in the first LED drive circuit 21d1 The adjustment is repeated. Thereby, the state in which the first LED 22a emits red light with a constant amount of emitted light corresponding to the first reference voltage value V1 is maintained.

Once _{t 15,} the first sample-and-hold circuit 21c1 is from the sample mode to the hold mode. Once _{t 16,} the 2LED22b, the 3LED22c is made to light up, the light source unit 22 emits white light. The electronic shutter of the imaging device at time t _17, the charges accumulated up to this point are discharged. Exposure period from the time point t ₁₈ after the completion discharging the charge is started.

At the time when the next readout pulse is output (time point t ₂₁ ), the exposure period ends, the second readout period R 2 starts, and after the completion of charge discharge by the electronic shutter immediately before the next exposure period (time point t ₂₈ ). In addition, the amount of light emitted from the second LED 22b is adjusted.

Once _{t 22,} the 1LED22a, the first 3LED22c off, only the 2LED22b is in the lighting state. That is, the 1LED22a, between time _{t 26} to the 3LED22c is made to light up again, the light source unit 22 emits a green light. Further, the reference current voltage value output from the reference voltage variable unit 21a to the comparator 21b is changed from the first reference current voltage value V1 to the second reference voltage value V2. After the reference voltage varying unit 21a at the time _{t 23} to the second reference voltage value V2 is to be outputted at the time _{t 24,} the second sample-and-hold circuit 21c2 is from the hold mode to the sample mode, until the time _{t 25} During a certain period of time, green light emission by the second LED 22b, light reception by the light receiving unit 26, comparison with the second reference voltage value V2 by the comparator 21b, and the drive amount based on the High signal or Low signal in the second LED drive circuit 21d2 The adjustment is repeated. Thereby, the state in which the second LED 22b emits green light with a constant amount of emitted light corresponding to the second reference voltage value V2 is maintained.

Once _{t 25,} the second sample-and-hold circuit 21c2 is from the sample mode to the hold mode. Once _{t 26,} the 1LED22a, the 3LED22c is made to light up, the light source unit 22 emits white light. The electronic shutter of the imaging device at time t _27, the charges accumulated up to this point are discharged. Exposure period is started from the discharging completion time t ₂₈ the charge.

At the time when the next readout pulse is output (time point t ₃₁ ), the exposure period ends, the third readout period R 3 starts, and until the end of charge discharge by the electronic shutter immediately before the next exposure period (time point t ₃₈ ). In addition, the amount of light emitted from the third LED 22c is adjusted.

Once _{t 32,} the 1LED22a, the first 2LED22b off, only the 3LED22c is in the lighting state. That is, the 1LED22a, between time _{t 36} to the 2LED22b is made to light up again, the light source unit 22 emits blue light. Further, the reference current voltage value output from the reference voltage variable unit 21a to the comparator 21b is changed from the second reference current voltage value V2 to the third reference voltage value V3. After the reference voltage varying unit 21a at the time _{t 33} to the third reference voltage value V3 is to be outputted at the time _{t 34,} the third sample and hold circuit 21c3 is from the hold mode to the sample mode, until the time _{t 35} During a certain period of time, the emission of blue light by the third LED 22c, the reception of light by the light receiving unit 26, the comparison with the third reference voltage value V3 by the comparator 21b, and the drive amount based on the High signal or Low signal in the third LED drive circuit 21d3 The adjustment is repeated. Thereby, the state in which the third LED 22c emits blue light with a constant amount of emitted light corresponding to the third reference voltage value V3 is maintained.

Once _{t 35,} the third sample and hold circuit 21c3 is from the sample mode to the hold mode, at time _{t 36,} the 1LED22a, the 2LED22b is made to light up, the light source unit 22 emits white light. The electronic shutter of the imaging device at time t _37, the charges accumulated up to this point are discharged. Exposure period from the time point t ₃₈ after the completion discharging the charge is started.

At the time when the next readout pulse is output (time point t ₄₁ ), the exposure period ends, the first readout period R1 starts again, and after the discharge of electric charges by the electronic shutter immediately before the next exposure period is completed (not shown). In addition, the amount of light emitted from the first LED 22a is adjusted.

  Based on the light from the first to third LEDs 22a to 22c received by the light receiving unit 26, information on the amount of light emitted from the first to third LEDs 22a to 22c is obtained. Since the variation factors of the emitted light amount are limited to those caused by the first to third LEDs 22a to 22c themselves such as aging and temperature change, the variation of the emitted light amount of the first to third LEDs 22a to 22c itself is taken into account accurately. The driving amount of each of the first to third LEDs 22a to 22c can be adjusted, and the emitted light amount of the first to third LEDs 22a to 22c can be adjusted. Moreover, even when the light emitted from the first to third LEDs 22a to 22c is not in a stable state, such as immediately after the power is turned on, by receiving the emitted light amount in such a state by the light receiving unit, Since the amount of emitted light can be adjusted, the adjustment of the amount of emitted light can be completed quickly. Further, since a light receiving element different from the imaging element used for obtaining an endoscopic image is used, normal endoscopic observation can be performed in parallel with the drive amount adjustment.

  In particular, the LED driver 21, the light receiving unit 26, and the control unit 28 allow the first LED 22a to emit light corresponding to the first reference voltage value V1, the second LED 22b to emit light corresponding to the second reference voltage value V2, and the third LED 22c to be third. The amount of emitted light corresponding to the reference voltage value V3 can be maintained. Since the first to third reference voltage values V1 to V3 are set so that the white light emitted from the light source unit 22 has a constant color temperature, the emitted light amount control of the first to third LEDs 22a to 22c is performed. The white light emitted from the light source unit 22 is kept at a constant color temperature.

  The drive amount supplied from the first LED drive circuit 21d1 to the first LED 22a, the drive amount supplied from the second LED drive circuit 21d2 to the second LED 22b, and the drive amount supplied from the third LED drive circuit 21d3 to the third LED 22c are as follows: 26, the white light emitted from the light source unit 22 can be maintained at a constant color temperature even when there is a change in the amount of light corresponding to the aging of the first to third LEDs 22a to 22c. It becomes possible.

  Further, when adjusting the amount of emitted light of the first to third LEDs 22a to 22c, the LEDs other than the LED to be adjusted are turned off, so that the amount of emitted light of the LED to be adjusted can be accurately measured. In addition, since such measurement is performed during the readout period of the image sensor, the endoscope image is not affected. In addition, since the amount of light emitted from the first to third LEDs 22a to 22c can be adjusted using a common light receiving element, accurate adjustment is possible without being affected by individual differences in the light receiving elements.

  Note that the timing of adjusting the amount of emitted light is not limited to the readout period. For example, if a color filter corresponding to the emission color of the first to third LEDs 22a to 22c can be switched between the light receiving element and the first to third LEDs 22a to 22c, the LEDs other than the target LED are turned off. Therefore, the amount of emitted light can be adjusted even during the exposure period. The light receiving unit 26 includes first to third light receiving elements, a color filter corresponding to the light emission color of the first LED 22a is provided between the first light receiving element and the first LED 22a, and between the second light receiving element and the second LED 22b. If a color filter corresponding to the emission color of the second LED 22b is provided, and a color filter corresponding to the emission color of the third LED 22c is provided between the third light receiving element and the third LED 22c, it is necessary to sequentially switch the color filters. Absent.

  In the present embodiment, the form in which the image processing processor 20 includes the light source device such as the LED driver 21 and the light source unit 22 has been described. However, the image processing processor 20 may have a separate structure. In addition, what is used as the light emitting member in the light source device is not limited to the LED as long as the amount of emitted light can be adjusted by the driving amount.

DESCRIPTION OF SYMBOLS 1 Endoscope system 10 Scope 11 Image pick-up part 12 Light guide 20 Image processor 21 LED driver 21a Reference voltage variable part 21b Comparator 21c1-21c3 1st-3rd sample hold circuit 21d1-21d3 1st-3rd LED drive circuit 21e I / V conversion part 22 Light source part 22a-22c 1st-3rd LED
23 Insulating Circuit 24 First Image Processing Unit 27 Second Image Processing Unit 28 Control Unit 29 Operation Unit 40 Monitor

Claims (4)

A plurality of light emitting members that emit light of different colors, and the light emitted from the plurality of light emitting members is used as illumination light for obtaining an endoscopic image;
The light receiving unit that receives light emitted from the plurality of light emitting members and is not used as the illumination light; and
An endoscope light source device, comprising: a drive unit that adjusts a drive amount of the plurality of light emitting members based on information on the amount of light emitted from the plurality of light emitting members from the light receiving unit.   2. The internal view according to claim 1, wherein the driving unit adjusts driving amounts of the plurality of light emitting members so that a color temperature of light emitted from the light source unit as the illumination light is constant. Mirror light source device. The light source unit includes first to third light emitting members as the plurality of light emitting members,
The light receiving unit receives light emitted from the first to third light emitting members,
The driving unit adjusts a driving amount of the first light emitting member based on information on the amount of light emitted from the first light emitting member from the light receiving unit, and relates to an amount of light emitted from the second light emitting member from the light receiving unit. The drive amount of the second light emitting member is adjusted based on the information, and the drive amount of the third light emitting member is adjusted based on the information related to the amount of light emitted from the light receiving portion of the third light emitting member. The endoscope light source device according to claim 1. During the first readout period of the imaging device used to obtain the endoscopic image, the first light emitting member is turned on while the first light emitting member is turned on and the second and third light emitting members are turned off. The drive amount is adjusted,
During the second readout period different from the first readout period, the drive amount of the second light emitting member is adjusted in a state where the second light emitting member is turned on and the first and third light emitting members are turned off. ,
Adjustment of the driving amount of the third light emitting member in a state where the third light emitting member is turned on and the first and second light emitting members are turned off during a third reading period different from the first and second reading periods. Is done
The light receiving unit receives light emitted from the first light emitting member, receives light emitted from the second light emitting member, and light emitted from the third light emitting member using a common light receiving element. The endoscope light source device according to claim 3, wherein the endoscope light source device receives light.

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