JP2009213742A - Light source unit for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent illumination light with an excessive quantity of light from being incident on an endoscope without requiring help from an inspection staff. <P>SOLUTION: A light source unit 14 is provided with a quantity of light adjusting mechanism 43 for adjusting the quantity of light of the illumination light emitted from a light source 42. A light source control information table 46 keeping light source control information for prescribing limit values of the quantity of light of the illumination light related to machine types of electronic endoscopes 10 is stored in a RAM 41 of the light source unit 14. A CPU 40 reads out scope identifying information 28 for identifying the machine type of an electronic endoscope 10 from a ROM 26 provided on each of the electronic endoscopes 10. The light source control information corresponding to the electronic endoscope 10 connected is acquired in reference to the light source control information table 46 from the scope identifying information 28 read out. The CPU 40 controls the quantity of the light adjusting mechanism 43 from the light source control information to adjust the quantity of light of the light source 42 so as to bring it below the given limit value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an endoscope light source device including a light source that supplies illumination light to an endoscope that is detachably connected.

  An endoscope system includes an endoscope (scope) that images a body cavity, a processor device that performs image processing on image data output from the endoscope and outputs the processed image data to a display device, and illumination light that illuminates the inside of the body cavity And a light source device that emits light. The endoscope has a ride guide made of an optical fiber having flexibility at an insertion portion to be inserted into a body cavity. The light guide guides the illumination light emitted from the light source device to an illumination window formed at the tip of the insertion portion. Thereby, the endoscope can perform imaging while illuminating the inside of the body cavity.

When illuminating the inside of a body cavity with illumination light, if the amount of illumination light is constant, the image may fly white or be crushed in black depending on the location within the body cavity and the distance to the subject. In order to prevent this, a diaphragm mechanism is provided in the light source device, and the amount of illumination light is adjusted based on the output signal of the image sensor (see, for example, Patent Document 1). In this way, by adjusting the amount of illumination light, it is possible to obtain an endoscopic image with an appropriate exposure according to the part in the body cavity and the distance to the subject.
JP-A-5-72487

  The limit value of the amount of illumination light incident on the endoscope is determined in advance for each endoscope model depending on the number of light guides and the diameter of the insertion portion. However, Patent Document 1 describes that the amount of illumination light is adjusted so as to achieve an appropriate exposure, but no consideration is given to the limit value of the amount of light. For this reason, when the distance to the subject is far and it is very dark, there is a concern that an excessive amount of illumination light exceeding the limit value may enter the endoscope. If an excessive amount of illumination light is incident on the endoscope, the distal end of the insertion section will generate heat, and blood adhering to the observation window will harden, making observation difficult, or imaging provided at the distal end of the insertion section. There arises a problem that the element breaks down.

  As one solution to the above problem, it is conceivable that inspection staff such as doctors, technicians, and nurses manually adjust the amount of illumination light so that it is below the limit value. However, the limit value of the illumination light differs depending on the endoscope model as described above. Therefore, when adjusting the light amount manually, the limit value of the endoscope to be used must be checked one by one, which is necessary for the inspection staff. It becomes very annoying. Furthermore, when adjusting the amount of light manually, it is conceivable that a human error may occur, so that it is not possible to reliably prevent the incidence of excessive illumination light.

  The present invention has been made in view of the above problems, and it is an object of the present invention to reliably prevent an excessive amount of illumination light from entering an endoscope without bothering the inspection staff. To do.

  In order to achieve the above object, an endoscope light source device of the present invention includes a light source that supplies illumination light to an endoscope that is detachably connected, and a light amount adjusting unit that adjusts the amount of the illumination light. And a control means for controlling the light quantity adjusting means so as to be equal to or less than the limit value based on light source control information that defines a limit value of the light quantity of the illumination light determined for each model of the endoscope. It is characterized by that.

  The endoscope has identification information storage means for storing identification information for identifying the endoscope model, and the control means includes the endoscope model and the light source control information. It is preferable to obtain the light source control information corresponding to the connected endoscope model by referring to the associated table data based on the identification information read from the identification information storage unit. .

  In addition, the endoscope has a light source control information storage unit that stores the light source control information, and the control unit reads out from the light source control information storage unit, so that a model of the connected endoscope is obtained. The corresponding light source control information may be acquired.

  Further, the light source control information is a control value for controlling the light amount adjusting means so that the light amount of the illumination light becomes the limit value, and the control as the integrated value of the lighting time of the light source becomes longer. A time measuring means for measuring the lighting time, and a lighting time storage means for storing an integrated value of the lighting time measured by the time measuring means, wherein the control means It is preferable to control the light amount adjusting means based on the integrated value and the light source control information stored in the time storage means.

  The light amount adjusting means includes a diaphragm plate in which a diaphragm opening is formed, a light shielding member that moves between a closed position that closes the diaphragm opening and an open position that exposes the diaphragm opening, and the light shielding member is closed. An urging member for urging the position; and a motor for moving the light shielding member to the open position against the urging member, and the light source control information is used for PWM control of the motor. It is a duty ratio, and the control means controls the torque of the motor by inputting a drive pulse signal of the duty ratio to the motor and changes the exposed area of the aperture opening to become the limit value or less. It is preferable to perform the control.

  In the present invention, based on the light source control information that defines the limit value of the amount of illumination light determined for each endoscope model, because the light amount of the illumination light is adjusted to be below the limit value, It is possible to reliably prevent an excessive amount of illumination light from entering the endoscope. Further, if the light source control information is acquired by the control means, the inspection staff is not bothered.

  FIG. 1 is a block diagram schematically showing the configuration of the endoscope system 2. The endoscope system 2 supplies an electronic endoscope 10 that images a patient's body cavity, a processor device 12 that generates an endoscope image, and illumination light for illuminating the body cavity to the electronic endoscope 10. And a monitor 16 for displaying an endoscopic image. The electronic endoscope 10 is detachably connected to the processor device 12 and the light source device 14 through a connector.

  The electronic endoscope 10 is formed in a thin tubular shape and has an insertion portion 20 that is inserted into a body cavity of a patient. An observation window 21 for capturing image light from the observation target and an illumination window 22 for irradiating illumination light supplied from the light source device 14 are provided at the distal end of the insertion unit 20. The electronic endoscope 10 is provided with a CCD 24, a light guide 25, and a ROM (identification information storage means) 26.

  The CCD 24 is disposed so as to face the observation window 21 at the distal end portion of the insertion portion 20 and captures image light incident through the observation window 21. The light guide 25 is made of an optical fiber having flexibility, and guides the illumination light supplied from the light source device 14 to the illumination window 22. The ROM 26 stores scope identification information 28 for identifying the model of the electronic endoscope 10. The scope identification information 28 may be any information as long as it can identify the model of the electronic endoscope 10 such as the product name or model number of the electronic endoscope 10.

  The processor device 12 includes a CPU 30, a RAM 31, a timing generator (hereinafter referred to as TG) 32, a CCD driver 33, a correlated double sampling / programmable gain amplifier (hereinafter referred to as CDS / PGA) 34, an A / D converter ( (Hereinafter referred to as A / D) 35, an image processing unit 36, a display control unit 37, and an automatic light control circuit 38 are provided. The RAM 31 stores various programs for controlling the processor device 12. The CPU 30 controls each unit of the processor device 12 by reading each program from the RAM 31 and sequentially processing the program.

  The TG 32 inputs a timing signal (clock pulse) to the CCD driver 33 under the control of the CPU 30. The CCD driver 33 inputs a drive signal to the CCD 24 based on the input timing signal, and controls the readout timing of the accumulated charge of the CCD 24, the shutter speed of the electronic shutter of the CCD 24, and the like.

  The CDS / PGA 34 performs noise removal and amplification on the imaging signal output from the CCD 24 based on the control of the CCD driver 33 and outputs it to the A / D 35. The A / D 35 converts the analog imaging signal output from the CDS / PGA 34 into digital image data and outputs the digital image data to the image processing unit 36. The image processing unit 36 performs various types of image processing on the image data digitized by the A / D 35 and outputs the image data after the image processing to the display control unit 37. The display control unit 37 converts the image data output from the image processing unit 36 into a video signal (component signal, composite signal, etc.) corresponding to the format of the monitor 16, and outputs the video signal to the monitor 16. Thereby, an endoscopic image obtained by photographing the inside of the body cavity of the patient is displayed on the monitor 16.

  Image data output from the A / D 35 is input to the automatic light control circuit 38 together with the image processing unit 36. The automatic light control circuit 38 calculates a photometric value representing the luminance of the subject image based on the integrated value of the luminance signal of the input image data, and outputs the calculation result to the light source device 14.

  The CPU 30 is connected to the ROM 26 through a universal cord provided in the connector or the electronic endoscope 10. For example, the CPU 30 accesses the ROM 26 in response to an instruction to start inspection, and reads the scope identification information 28 from the ROM 26. When the CPU 30 reads the scope identification information 28 from the ROM 26, the CPU 30 outputs the scope identification information 28 to the light source device 14.

  The light source device 14 includes a CPU 40 that comprehensively controls each unit of the light source device 14, a RAM 41 that stores various programs for controlling the light source device 14, a light source 42 that emits illumination light, and the amount of illumination light. A light amount adjusting mechanism (light amount adjusting means) 43 for adjusting and an iris driver (control means) 44 for controlling light amount adjustment by the light amount adjusting mechanism 43 are provided.

  As shown in FIG. 2, the light amount adjusting mechanism 43 includes a diaphragm plate 50, a shutter (light shielding member) 51, a coil spring (biasing member) 52, and a motor 53. The diaphragm plate 50 is provided with a diaphragm opening 50a formed in a substantially circular shape. The diaphragm plate 50 is arranged so that the central axis of the light source 42 and the central axis of the diaphragm opening 50a coincide. The shutter 51 is provided with a shaft portion 51a formed in a round bar shape. The shutter 51 is rotatably supported in the light source device 14 via the shaft portion 51a.

  The coil spring 52 has one end connected to the shutter 51 and the other end connected to a support member fixed to the housing of the light source device 14 and biases the shutter 51 in a direction to pull the shutter 51 toward the support member. The shutter 51 urged by the coil spring 52 abuts against a protrusion 50b provided on the diaphragm plate 50, and is held at a closed position that closes the diaphragm opening 50a as shown in FIG.

  The motor 53 is connected to the iris driver 44. The motor 53 rotationally drives the rotating shaft in accordance with the drive pulse signal input from the iris driver 44, and transmits the driving force to the shaft portion 51a via a gear or the like. As a result, the shutter 51 rotates clockwise around the shaft portion 51a against the bias of the coil spring 52, and the aperture opening 50a is exposed as shown in FIGS. 2 (b) and 2 (c). The

  The light amount adjusting mechanism 43 is configured such that when a driving pulse signal with a duty ratio of 100% is input, the coil spring 52 moves so that the shutter 51 moves to an open position where the entire aperture opening 50a is exposed (see FIG. 2C). And the torque of the motor 53 are determined. That is, the light amount adjusting mechanism 43 moves the shutter 51 between the closed position and the open position in accordance with the duty ratio of the drive pulse signal, and changes the exposed area of the aperture opening 50a, thereby illuminating the light source 42. Adjust the amount of light. The iris driver 44 controls the light amount adjustment of the illumination light by the light amount adjustment mechanism 43 by inputting drive pulse signals with different duty ratios to the motor 53 based on the control signal from the CPU 40.

  The RAM 41 stores a light source control information table (table data) 46. The limit value of the amount of illumination light incident on the electronic endoscope 10 differs for each model of the electronic endoscope 10 depending on the number of light guides 25 and the diameter of the insertion portion 20. The light source control information table 46 shows the correspondence between the model of the electronic endoscope 10 and the limit value of the amount of illumination light, and as shown in FIG. 3, the model of the electronic endoscope 10 and the illumination light. The maximum duty ratio of the motor 53 (corresponding to the control value described in claims) is recorded in association with the light source control information that defines the limit value of the light quantity.

  The CPU 40 is connected to the CPU 30 of the processor device 12 and the automatic light control circuit 38. The CPU 40 receives the scope identification information 28 read from the ROM 26 from the CPU 30 and receives the calculated photometric value from the automatic light control circuit 38. When receiving the scope identification information 28, the CPU 40 refers to the light source control information table 46 based on the scope identification information 28 and corresponds to the model of the electronic endoscope 10 connected to the processor device 12 and the light source device 14. Get the maximum duty ratio.

  When the CPU 40 acquires the maximum duty ratio corresponding to the model of the electronic endoscope 10, it transmits a control signal including information on the maximum duty ratio and the photometric value to the iris driver 44. Based on the received control signal, the iris driver 44 determines a duty ratio in which the amount of illumination light is appropriately exposed within a range equal to or less than the maximum duty ratio, and outputs a drive pulse signal with the duty ratio to the motor 53.

  For example, when the model of the connected electronic endoscope 10 is “endoscope 1” shown in the first row of the light source control information table 46, the iris driver 44 is in the Hi state for 40% of one cycle. A drive pulse signal with a duty ratio of 40% (see FIG. 4A) is maximized, and a drive pulse signal with a duty ratio of 40% or less is output to the motor 53 based on the photometric value included in the control signal.

  If the connected electronic endoscope 10 is “endoscope 2” shown in the second line of the light source control information table 46, the iris driver 44 is in the Hi state for 70% of one cycle. A drive pulse signal with a duty ratio of 70% (see FIG. 4B) is maximized, and a drive pulse signal with a duty ratio of 70% or less is output to the motor 53 based on the photometric value included in the control signal. As described above, by inputting a drive pulse signal having a duty ratio corresponding to the model of the electronic endoscope 10 and the photometric value to the motor 53 and adjusting the amount of illumination light, appropriate exposure can be obtained and excessively large. It is possible to reliably prevent a large amount of illumination light from entering the electronic endoscope 10.

  Next, the operation of the endoscope system 2 configured as described above will be described with reference to the flowchart shown in FIG. When the inspection is performed by the endoscope system 2, first, the clean electronic endoscope 10 that has been cleaned and disinfected is connected to the processor device 12 and the light source device 14. Thereafter, an examination start button provided in the processor device 12 is pressed to start an endoscopic examination.

  When the CPU 30 of the processor device 12 is instructed to start the inspection, the CPU 30 starts control of the TG 32 and causes the CCD driver 33 to output a drive signal for the CCD 24. The CCD 24 images the image light incident through the observation window 21 based on the input drive signal, and outputs the image signal to the CDS / PGA 34. The output imaging signal is output to the monitor 16 through noise removal and amplification by the CDS / PGA 34, A / D conversion by the A / D 35, image processing by the image processing unit 36, and conversion to a video signal by the display control unit 37. Entered. Thereby, an endoscopic image is displayed on the monitor 16.

  The image data output from the A / D 35 is input to the image processing unit 36 and also input to the automatic light control circuit 38. The automatic light control circuit 38 calculates a photometric value based on the input image data, and sends the calculated photometric value to the CPU 40 of the light source device 14.

  When instructed to start the examination, the CPU 30 displays an endoscopic image, accesses the ROM 26, and reads the scope identification information 28 from the ROM 26. When the CPU 30 reads the scope identification information 28, the CPU 30 sends the scope identification information 28 and an instruction to start lighting the light source 42 to the CPU 40 of the light source device 14.

  When the CPU 40 of the light source device 14 receives the scope identification information 28 and the lighting start instruction of the light source 42 from the CPU 30 of the processor device 12, the CPU 40 first refers to the light source control information table 46 based on the scope identification information 28, and 12 and the maximum duty ratio corresponding to the model of the electronic endoscope 10 connected to the light source device 14 is acquired. When acquiring the maximum duty ratio, the CPU 40 turns on the light source 42 and transmits a control signal to the iris driver 44. The iris driver 44 outputs to the motor 53 a drive pulse signal having a duty ratio corresponding to the acquired maximum duty ratio and photometric value based on the control signal.

  Thereby, the light quantity of illumination light is adjusted to an appropriate exposure value. In addition, since the duty ratio is adjusted to a predetermined maximum duty ratio or less for each model of the electronic endoscope 10, it is possible to reliably prevent an excessive amount of illumination light from entering the electronic endoscope 10. can do. Furthermore, since the CPU 40 automatically acquires the maximum duty ratio corresponding to the model of the electronic endoscope 10 based on the scope identification information 28 and the light source control information table 46, it does not bother the inspection staff. .

  In the above embodiment, the scope identification information 28 is read from the ROM 26 provided in the electronic endoscope 10, and the maximum duty ratio is acquired by referring to the light source control information table 46 based on the scope identification information 28. However, the method for obtaining the maximum duty ratio is not limited to this. For example, as in the endoscope system 60 shown in FIG. 6, duty ratio information (light source control information) 65 indicating the maximum duty ratio corresponding to the model of the electronic endoscope 61 is stored in a ROM (light source control information storage means) 64. The maximum duty ratio corresponding to the model of the electronic endoscope 60 may be acquired by storing and reading the duty ratio information 65 from the ROM 64. With this configuration, it is not necessary to store the light source control information table 46 in the RAM 66 of the light source device 62.

  In the above embodiments, the maximum duty ratio of the drive pulse signal input to the motor 53 is shown as the light source control information that defines the limit value of the amount of illumination light. However, the present invention is not limited to this. The voltage value or current value of the DC power source applied to the light source may be used as light source control information, and the light amount of the illumination light may be adjusted by controlling the voltage or current of the light source 42. Furthermore, the light amount of the limit value itself may be used as the light amount control information, and may be adjusted to the limit value or less by referring to a table in which the light amount and the duty ratio are associated with each other.

  In the general electronic endoscope 10, it is only necessary to transmit illumination light, and therefore only an optical connector is used for connection to the light source device 14. Therefore, there is no function for transmitting and receiving electrical signals between the conventional electronic endoscope 10 and the light source device 14. 1 and 6, the CPU 30 of the processor device 12 reads the scope identification information 28 and the duty ratio information 62 from the ROM 26 and sends them to the CPU 40 of the light source device 14. In this way, it is not necessary to modify the connector between the electronic endoscope 10 and the light source device 14.

  However, without being limited thereto, for example, a connector for transmitting and receiving an electrical signal between the electronic endoscope 10 and the light source device 14 may be separately provided, and illumination light transmission and electrical signal transmission and reception may be performed. By using a connector that can be used, the CPU 76 of the light source device 72 may directly read the scope identification information 75 and the like from the ROM 74 as in the endoscope system 70 shown in FIG.

  It is known that the amount of light from the light source 42 decreases due to deterioration over time. However, in each of the above embodiments, the amount of illumination light is adjusted so as to be equal to or less than a certain maximum duty ratio determined for each model of the electronic endoscope 10. For this reason, if the light source 42 deteriorates with time, even if a drive pulse signal having the maximum duty ratio is input to the motor 53, the amount of illumination light becomes darker than the limit value. In order to prevent this, an endoscope system 80 shown in FIG. 8 may be configured.

  The light source device 82 of the endoscope system 80 has a counter (time measuring means) 85 for measuring the lighting time of the light source 42 in the CPU 84. The RAM (lighting time storage means) 86 of the light source device 82 stores light source lighting time integration information 87 indicating the integrated value of the lighting time counted by the counter 85, and a light source control information table 88. The CPU 84 first reads the light source lighting time integration information 87 from the RAM 86 when turning on the light source 42. Then, the CPU 84 inputs the read light source lighting time integration information 87 to the counter 85. After the light source lighting time integration information 87 is input to the counter 85, the CPU 84 turns on the light source 42 and starts time measurement by the counter 85. At this time, the counter 85 measures time so as to be added to the lighting time up to the present time indicated by the light source lighting time integration information 87.

  When the CPU 84 turns off the light source 42 in response to an inspection end instruction or the like, the CPU 84 stops timing by the counter 85 and stores the timing result in the RAM 86 as new light source lighting time integration information 87. In this way, by reading the light source lighting time integration information 87, measuring the time, and storing the new light source lighting time integration information 87, an integrated value of the lighting time of the light source 42 can be obtained.

  In the light source control information table 88 of the present embodiment, as shown in FIG. 9, the maximum duty ratio of the motor 53 is divided for each lighting time of the light source 42 and is associated with the model of the electronic endoscope 81. Each maximum duty ratio becomes higher as the lighting time of the light source 42 becomes longer in order to correct a decrease in light amount due to deterioration of the light source 42 over time.

  When the CPU 84 receives the scope identification information 28 and the lighting start instruction of the light source 42 from the CPU 30 of the processor device 83, the CPU 84 reads the light source lighting time integration information 87 from the RAM 86. When the CPU 84 reads the light source lighting time integration information 87, the CPU 84 refers to the light source control information table 88 based on the light source lighting time integration information 87 and the scope identification information 28, and the model of the connected electronic endoscope 81, and The maximum duty ratio corresponding to the integrated value of the lighting time of the light source 42 is acquired. For example, when the model of the electronic endoscope 10 is “endoscope 1” and the integrated value of the lighting time is “55 hours”, the CPU 84 acquires “41%” as the corresponding maximum duty ratio.

  When acquiring the maximum duty ratio, the CPU 84 turns on the light source 42 and starts the time measurement by the counter 85 as described above. Then, a control signal is transmitted to the iris driver 44 to cause the motor 53 to output a drive pulse signal having a duty ratio corresponding to the acquired maximum duty ratio and photometric value. Further, the CPU 84 refers to the light source control information table 88 based on the time measurement result of the counter 85 and the scope identification information 28 and periodically updates the maximum duty ratio.

  As described above, in this embodiment, the counter 85 and the light source lighting time integration information 87 are provided, and the maximum duty ratio is increased as the integrated value of the lighting time of the light source 42 becomes longer. Even when this occurs, the amount of illumination light can be appropriately adjusted to the limit value.

  In each of the above embodiments, the ROM 26 is shown as the identification information storage unit and the light source control information storage unit. However, the storage unit is not limited to this, and the scope identification information 28 and the duty ratio such as an RFID tag are used. Any information can be used as long as the information 62 can be stored. In each of the above embodiments, the CCD 24 is shown as an image sensor. However, the image sensor is not limited to this and may be, for example, a CMOS image sensor.

  In each of the above embodiments, the electronic endoscope 10 is shown as an endoscope. However, the endoscope is not limited to this, and may be, for example, an ultrasonic endoscope. In each of the above embodiments, a medical endoscope having a patient as a subject is shown. However, the endoscope is not limited thereto, and may be an industrial one having a pipe or the like as a subject. Further, in each of the above-described embodiments, the example in which the present invention is applied to the light source device 14 separated from the processor device 12 has been described. However, the present invention is not limited thereto, and for example, a light source integrated processor device. You may apply to.

It is a block diagram which shows the structure of an endoscope system roughly. It is explanatory drawing which shows the structure of a light quantity adjustment mechanism roughly. It is explanatory drawing which shows an example of a light quantity control information table. It is explanatory drawing which shows an example of a drive pulse signal. It is a flowchart which shows roughly the test | inspection procedure of an endoscope system. It is a block diagram which shows the example which memorize | stored light source control information in ROM of the endoscope. It is a block diagram which shows the example from which CPU of a light source device reads identification information. It is a block diagram which shows the example which changes a duty ratio according to the lighting time of a light source. It is explanatory drawing which shows an example of the light quantity control information table in the case of changing a duty ratio according to the lighting time of a light source.

Explanation of symbols

2 Endoscope System 10 Electronic Endoscope 12 Processor Unit 14 Light Source Unit 26 ROM (Identification Information Storage Unit)
28 Scope Identification Information 41 RAM
42 Light source 43 Light quantity adjustment mechanism (light quantity adjustment means)
44 Iris driver (control means)
46 Light source control information table (table data)
50 Aperture plate 50a Aperture aperture 51 Shutter (light-shielding member)
52 Coil spring (biasing member)
53 Motor 64 ROM (light source control information storage means)
65 Duty ratio information (light source control information)
85 counter (time measuring means)
86 RAM (lighting time storage means)
87 Light source lighting time integration information

Claims (5)

In an endoscope light source device including a light source that supplies illumination light to an endoscope that is detachably connected,
A light amount adjusting means for adjusting a light amount of the illumination light;
Control means for controlling the light quantity adjusting means so as to be equal to or less than the limit value based on light source control information that defines a limit value of the light quantity of the illumination light determined for each type of endoscope. An endoscope light source device characterized by the above. The endoscope has identification information storage means for storing identification information for identifying the type of the endoscope,
The control means is connected by referring to the table data in which the endoscope model and the light source control information are associated with each other based on the identification information read from the identification information storage means. 2. The endoscope light source device according to claim 1, wherein the light source control information corresponding to an endoscope model is acquired. The endoscope has light source control information storage means for storing the light source control information,
The light source for an endoscope according to claim 1, wherein the control means acquires the light source control information corresponding to a model of the connected endoscope by reading from the light source control information storage means. apparatus. The light source control information is a control value for controlling the light amount adjusting means so that the light amount of the illumination light becomes the limit value, and the control value becomes larger as the integrated value of the lighting time of the light source becomes longer. Configured to be high,
A timing means for timing the lighting time; and a lighting time storage means for storing an integrated value of the lighting time measured by the timing means;
The said control means controls the said light quantity adjustment means based on the said integrated value memorize | stored in the said lighting time memory | storage means and the said light source control information, The any one of Claim 1 to 3 characterized by the above-mentioned. The endoscope light source device described. The light amount adjusting means includes: a diaphragm plate having a diaphragm opening; a light shielding member that moves between a closed position that closes the diaphragm opening and an open position that exposes the diaphragm opening; and the light shielding member at the closed position. An urging member for urging, and a motor for moving the light shielding member to the open position against the urging member;
The light source control information is a duty ratio for PWM control of the motor,
The control means controls the torque of the motor by inputting a drive pulse signal having the duty ratio to the motor, and performs control so as to be less than the limit value by changing the exposed area of the aperture opening. The endoscope light source device according to claim 1, wherein the light source device is an endoscope.

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