JP2019034074A - Endoscope and processor - Google Patents

Abstract

To provide an endoscope that can deal with an overcurrent at an early stage even when an overcurrent is generated in inspecting a subject, and to provide a processor.SOLUTION: An endoscope 2 includes a first power source control part 583 for stopping a first drive voltage (a) supplied by a first power source voltage generating part 55 to an imaging part 20 when a first determination part 581 determines that a current value that is detected by a detector 57 is abnormal after a second power source voltage generating part 56 starts supplying a second electrical power.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an endoscope and a processor that are inserted into a subject to generate in-vivo image data.

  Conventionally, each of the imaging element such as a CMOS (Complementary Metal Oxide Semiconductor) image sensor, peripheral circuit, and IC provided at the distal end of the insertion portion of the endoscope is regulated in the power activation sequence, and is activated according to the regulation. Need to do. For this reason, in a recent endoscope, when an endoscope is connected to a processor, an overcurrent flows to the image pickup device by waiting for power supply to the image pickup device until a predetermined time elapses after the connection. A technique for preventing this is known (see Patent Document 1).

Japanese Patent No. 4475778

  However, Patent Document 1 described above merely prevents an overcurrent from flowing into the imaging element when the endoscope and the processor are connected. For this reason, in the above-mentioned Patent Document 1, no consideration is given to handling when an overcurrent occurs during the examination of the subject, and if an overcurrent occurs during the examination of the subject, the overcurrent flows into the image sensor. Therefore, there is a risk that the image sensor will break down.

  The present invention has been made in view of the above, and provides an endoscope and a processor capable of responding to overcurrent at an early stage even when overcurrent occurs during examination of a subject. The purpose is to do.

  In order to solve the above-described problems and achieve the object, an endoscope according to the present invention includes an imaging unit that receives light and performs photoelectric conversion to generate an imaging signal, and a first input from the outside. A first power supply voltage generator that generates at least a first drive voltage for driving the imaging unit based on a power supply voltage and supplies the first drive voltage to the imaging unit, and the first power supply voltage generated by the first power supply voltage generator A transmission path for transmitting a drive voltage to the imaging section, a detection section for detecting a current value on the transmission path for transmitting the first drive voltage generated by the first power supply voltage generation section, and a detection section detected by the detection section A determination unit that determines whether or not the current value is abnormal, a first power supply control unit that controls the first drive voltage supplied by the first power supply voltage generation unit, and the first input from the outside Based on the second power supply voltage that is different from the power supply voltage A second power supply voltage generation unit that generates and supplies at least a second drive voltage different in voltage from the first drive voltage to the first power supply control unit, wherein the first power supply control unit includes the first power supply control unit, When the current value is determined to be abnormal by the determination unit while the second power supply voltage generation unit supplies the second drive voltage, the first power supply voltage generation unit supplies the imaging unit. The first drive voltage is stopped.

  In the endoscope according to the present invention, in the above invention, the first power supply controller generates the first power supply voltage after causing the second power supply voltage generator to start supplying the second drive voltage. The supply of the first drive voltage to the unit is started.

  In the endoscope according to the present invention, in the above invention, when the current value is determined to be abnormal by the determination unit, the first drive voltage supplied by the first power supply voltage generation unit is abnormal. It further includes an output unit that outputs information indicating that it exists to the outside.

  The endoscope according to the present invention further includes an imaging signal processing unit that performs signal processing on the imaging signal and outputs the imaging signal to the outside in the above-described invention, and the first power supply voltage generation unit includes the imaging signal. The first drive voltage is further supplied to a processing unit, and the first power supply control unit is configured to transfer the first power supply voltage generation unit to the imaging unit when the determination unit determines that the current value is abnormal. The supply of the first drive voltage is stopped.

  The endoscope according to the present invention further includes a distal end portion that can be inserted into a subject and a connector portion that is detachable from a processor that performs image processing on the imaging signal. Each of the first power supply voltage generation unit, the detection unit, the determination unit, the first power supply control unit, and the second power supply voltage generation unit is provided in the connector unit. It is characterized by.

  The processor according to the present invention includes a power supply unit that supplies a first power supply voltage and a second power supply voltage that are different from each other to an endoscope connected from the outside, and the second power supply voltage to the power supply unit. And a second power supply control unit for starting the supply of the first power supply voltage after the supply of the first power supply is started.

  According to the present invention, even when an overcurrent occurs during examination of a subject, there is an effect that it is possible to quickly cope with the overcurrent.

FIG. 1 is a schematic view schematically showing an overall configuration of an endoscope system according to an embodiment of the present invention. FIG. 2 is a block diagram showing a functional configuration of a main part of the endoscope system according to the embodiment of the present invention. FIG. 3 is a flowchart showing an outline of processing executed by the endoscope system according to the embodiment of the present invention. FIG. 4 is a diagram schematically showing a timing chart of a normal shutdown sequence executed by the endoscope system according to the embodiment of the present invention. FIG. 5 is a flowchart showing an overview of the overcurrent detection process of FIG. FIG. 6 is a diagram schematically showing a timing chart in the sequence of overcurrent detection processing executed by the endoscope system according to the embodiment of the present invention.

  Hereinafter, an endoscope system including an imaging device will be described as a mode for carrying out the present invention (hereinafter referred to as “embodiment”). Further, the present invention is not limited by this embodiment. Further, in the description of the drawings, the same portions will be described with the same reference numerals. Furthermore, the drawings are schematic, and it should be noted that the relationship between the thickness and width of each member, the ratio of each member, and the like are different from the actual ones. Moreover, the part from which a mutual dimension and ratio differ also in between drawings.

[Configuration of endoscope system]
FIG. 1 is a schematic view schematically showing an overall configuration of an endoscope system according to an embodiment of the present invention. An endoscope system 1 shown in FIG. 1 includes an endoscope 2, a transmission cable 3, a connector unit 5, a processor 6 (control device), a display device 7, and a light source device 8.

  The endoscope 2 outputs an imaging signal (image data) generated by imaging the inside of the subject by inserting the insertion portion 100 which is a part of the transmission cable 3 into the body cavity of the subject to the processor 6. . In addition, the endoscope 2 is provided at one end side of the transmission cable 3 and an imaging unit 20 (imaging device) that performs imaging on the distal end 101 side of the insertion unit 100 inserted into the body cavity of the subject. An operation unit 4 that accepts various operations on the endoscope 2 is connected to the proximal end 102 side of the insertion unit 100. An imaging signal of an image captured by the imaging unit 20 is output to the connector unit 5 via the transmission cable 3 having a length of several meters, for example.

  The connector unit 5 is detachably connected to the processor 6 and the light source device 8, and performs predetermined signal processing on the imaging signal (image data) output from the imaging unit 20, and digitally converts the imaging signal (image data) from an analog signal. The signal is converted (A / D conversion) and output to the processor 6.

  The processor 6 performs predetermined image processing on the imaging signal input from the connector unit 5 and comprehensively controls the entire endoscope system 1. In the first embodiment, the processor 6 functions as a control device.

  The display device 7 displays an image corresponding to the image signal subjected to image processing by the processor 6. The display device 7 displays various information related to the endoscope system 1.

  The light source device 8 is configured using, for example, a halogen lamp, a white LED (Light Emitting Diode), or the like, and the subject is viewed from the distal end 101 side of the insertion unit 100 of the endoscope 2 via the connector unit 5 and the transmission cable 3. Irradiate with illumination light.

[Functional configuration of main part of endoscope system]
Next, the functional configuration of the main part of the endoscope system 1 described above will be described. FIG. 2 is a block diagram illustrating a functional configuration of a main part of the endoscope system 1.

[Configuration of endoscope]
First, the endoscope 2 will be described.
As shown in FIG. 2, the endoscope 2 includes an imaging unit 20, a transmission cable 3, and a connector unit 5.

  As shown in FIG. 2, the imaging unit 20 includes a first chip 21 (imaging element) and a second chip 22. The imaging unit 20 is supplied with a first drive voltage a (for example, in the case of a CMOS imager) that is generated by a first power supply voltage generation unit 55 of a connector unit 5 described later via a transmission cable 3 that functions as a transmission path. 3.3V) is received together with the ground GND. Further, the imaging unit 20 receives a reference clock signal and a drive signal generated by a drive signal generation unit 54 of the connector unit 5 described later via the transmission cable 3. A power supply stabilizing capacitor C1 is provided between the first drive voltage a supplied to the imaging unit 20 and the ground GND.

  The first chip 21 is arranged in a two-dimensional matrix in the matrix direction, receives light from outside, generates an imaging signal corresponding to the amount of received light, and outputs a light receiving unit 23 (pixel unit) ), A readout unit 24 that reads out the imaging signal photoelectrically converted by the light receiving unit 23, and a timing generation unit that generates a timing signal based on the reference clock signal and the drive signal input from the connector unit 5 and outputs the timing signal to the readout unit 24 25.

  The second chip 22 includes a buffer 27 that functions as a transmission unit that transmits the imaging signal output from the first chip 21 to the processor 6 via the transmission cable 3 and the connector unit 5. The combination of the circuits mounted on the first chip 21 and the second chip 22 can be changed as appropriate according to the convenience of setting.

  The connector unit 5 includes a reception unit 51, an A / D conversion unit 52, an imaging signal processing unit 53, a drive signal generation unit 54, a second power supply voltage generation unit 56, a first power supply voltage generation unit 55, A detection unit 57 and a scope control unit 58 are provided.

  The receiving unit 51 receives the imaging signal transmitted from the imaging unit 20 under the control of the scope control unit 58, performs impedance matching with a passive element such as a resistor, extracts an AC component with a capacitor, and performs voltage division. The operating point is determined by resistance. Thereafter, the reception unit 51 outputs an analog imaging signal to the A / D conversion unit 52. The receiving unit 51 is configured using an analog front end circuit.

  Under the control of the scope control unit 58, the A / D conversion unit 52 converts the analog imaging signal input from the reception unit 51 into a digital imaging signal and outputs the digital imaging signal to the imaging signal processing unit 53. An A / D conversion circuit is used.

  The imaging signal processing unit 53 performs format conversion processing, gain adjustment processing, and the like on the digital imaging signal input from the A / D conversion unit 52 under the control of the scope control unit 58 and outputs the result to the processor 6. To do. The imaging signal processing unit 53 is configured using, for example, an FPGA (Field Programmable Gate Array).

  The drive signal generation unit 54 is supplied from a clock generation unit 63 of the processor 6 to be described later, and based on a reference clock signal (for example, a 27 MHz clock signal) serving as a reference for the operation of each component of the endoscope 2. A drive signal representing the start position of the frame is generated and output to the timing generation unit 25 of the imaging unit 20 via the transmission cable 3 together with the reference clock signal. Here, the drive signal generated by the drive signal generation unit 54 includes a horizontal synchronization signal and a vertical synchronization signal.

  The first power supply voltage generation unit 55 determines the connector unit 5 based on the first power supply voltage A (for example, about 5 V in the case of a CMOS imager) input from a power supply unit 61 of the processor 6 to be described later and the ground GND. A first drive voltage a for driving each component and the imaging unit 20 is generated and output to each component and the imaging unit 20 constituting the connector unit 5. The first power supply voltage generation unit 55 is configured using a regulator.

  The second power supply voltage generation unit 56 is a second drive for driving the scope control unit 58 based on the second power supply voltage B (for example, 4V) input from the power supply unit 61 of the processor 6 to be described later and the ground GND. A voltage b (for example, a plurality of types of power supplies, more specifically 1V, 1.8V, 3.3V, etc.) is generated and supplied to the scope control unit 58. The second power supply voltage generation unit 56 is configured using a regulator.

  The detection unit 57 detects the current value on the transmission cable 3 that transmits the first drive voltage a generated by the first power supply voltage generation unit 55, and outputs the detection result to the scope control unit 58. The detection unit 57 is configured using an A / D conversion circuit or the like, and performs an A / D conversion process on the current value on the transmission cable 3 that transmits the first drive voltage a generated by the first power supply voltage generation unit 55. The digital value is output to the scope control unit 58.

  The scope control unit 58 comprehensively controls each unit constituting the connector unit 5. The scope control unit 58 is configured using an FPGA. The scope control unit 58 includes a first determination unit 581, an output unit 582, and a first power supply control unit 583.

  The first determination unit 581 determines whether or not the current value detected by the detection unit 57 is abnormal. Specifically, the first determination unit 581 determines whether or not the current value detected by the detection unit 57 is less than the first threshold value. Further, the first determination unit 581 determines whether or not the current value detected by the detection unit 57 is less than the second threshold value when the current value is not less than the first threshold value. The first threshold value is smaller than the second threshold value. The first threshold is a value indicating that an overcurrent has occurred. Furthermore, the second threshold value is a value that is expected to increase in temperature when an overcurrent flows through the imaging unit 20.

  The output unit 582 outputs information indicating that an overcurrent is generated on the transmission cable 3 that transmits the first drive voltage a generated by the first power supply voltage generation unit 55 to the processor 6. Specifically, the output unit 582 outputs an error signal including an error flag indicating that an overcurrent has occurred to the processor 6.

  The first power supply control unit 583 controls the first power supply voltage generation unit 55 and the second power supply voltage generation unit 56. Specifically, the first power supply control unit 583 is a current value detected by the detection unit 57 in the state where the second power supply voltage generation unit 56 supplies the second drive voltage b. Is determined to be abnormal, the first drive voltage a supplied to the imaging unit 20 by the first power supply voltage generation unit 55 is stopped.

[Processor configuration]
Next, the configuration of the processor 6 will be described.
The processor 6 is a control device that comprehensively controls the entire endoscope system 1. The processor 6 includes a power supply unit 61, an image signal processing unit 62, a clock generation unit 63, a recording unit 64, an input unit 65, and a processor control unit 66.

  The power supply unit 61 generates the first power supply voltage A under the control of the processor control unit 66, and supplies the generated first power supply voltage A together with the ground GND to the first power supply voltage generation unit 55 of the connector unit 5. To do. Further, the power supply unit 61 generates a second power supply voltage B under the control of the processor control unit 66, and the generated second power supply voltage B together with the ground GND together with the second power supply voltage generation unit 56 of the connector unit 5. To supply. Specifically, the power supply unit 61 supplies the second power supply voltage B to the second power supply voltage generation unit 56 under the control of the processor control unit 66, and then supplies the first power supply voltage A to the first power supply voltage generation unit. 55 is supplied.

  The image signal processing unit 62 performs synchronization processing, white balance (WB) adjustment processing, gain, and the like on the digital imaging signal subjected to signal processing by the imaging signal processing unit 53 under the control of the processor control unit 66. Image processing such as adjustment processing, γ correction processing, digital analog (D / A) conversion processing, format conversion processing, and the like is performed to convert it into an image signal, and this image signal is output to the display device 7.

  The clock generation unit 63 generates a reference clock signal that serves as a reference for the operation of each component of the endoscope system 1, and outputs this reference clock signal to the drive signal generation unit 54.

  The recording unit 64 records various programs executed by the endoscope system 1, data being processed, image data, and the like. The recording unit 64 is configured using a volatile memory or a nonvolatile memory.

  The input unit 65 receives input of various operations related to the endoscope system 1. For example, the input unit 65 receives an input of an instruction signal for switching the type of illumination light emitted from the light source device 8 and an instruction signal for instructing termination. The input unit 65 is configured using, for example, a cross switch, a push button, a touch panel, and the like.

  The processor control unit 66 comprehensively controls each unit constituting the endoscope system 1. The processor control unit 66 is configured using a CPU (Central Processing Unit) or the like. The processor control unit 66 switches the illumination light emitted from the light source device 8 in accordance with the instruction signal input from the input unit 65. The processor control unit 66 includes a second power supply control unit 661.

  The second power supply control unit 661 controls driving of the power supply unit 61. Specifically, the second power supply control unit 661 starts the supply of the first power supply voltage A after the power supply unit 61 starts the supply of the second power supply voltage B. In addition, when the second power supply control unit 661 receives a signal including an error flag from the endoscope 2, the second power supply voltage B and the first power supply that the power supply unit 61 supplies to the endoscope 2 after a predetermined time has elapsed. The supply of voltage A is stopped.

[Configuration of display device]
The display device 7 displays the image captured by the imaging unit 20 based on the image signal input from the image signal processing unit 62. The display device 7 is configured using a display panel such as liquid crystal or organic EL (Electro Luminescence).

[Endoscope system processing]
Next, processing executed by the endoscope system 1 will be described. FIG. 3 is a flowchart showing an outline of processing executed by the endoscope system 1.

  As shown in FIG. 3, first, when the power supply of the processor 6 is activated via the input unit 65, the second power supply control unit 661 sends the second power supply voltage generation unit 56 of the connector unit 5 to the second power supply voltage generation unit 56 of the connector unit 5. Two power supply voltages B are supplied (step S101).

  Subsequently, the processor control unit 66 starts communication with the scope control unit 58 (step S102). When communication with the scope control unit 58 is established (step S103: Yes), the endoscope system 1 performs steps described later. The process proceeds to S104. On the other hand, the processor control unit 66 starts communication with the scope control unit 58 (step S102). When communication with the scope control unit 58 is not established (step S103: No), the processor control unit 66 This determination is continued until communication with the scope control unit 58 is established.

  In step S <b> 104, the second power supply control unit 661 causes the power supply unit 61 to supply the first power supply voltage A to the first power supply voltage generation unit 55 of the connector unit 5. As a result, the first power supply voltage generation unit 55 generates the first drive voltage a and starts supplying the first drive voltage a.

  Subsequently, the detection unit 57 detects the current value of the first drive voltage a supplied by the first power supply voltage generation unit 55 (step S105). In this case, the detection unit 57 outputs the detection result to the scope control unit 58.

  Thereafter, the first determination unit 581 determines whether or not the current value detected by the detection unit 57 is less than the first threshold value (step S106). When it is determined by the first determination unit 581 that the current value detected by the detection unit 57 is less than the first threshold (step S106: Yes), the endoscope system 1 proceeds to step S107 described later. On the other hand, when the first determination unit 581 determines that the current value detected by the detection unit 57 is not less than the first threshold (step S106: No), the endoscope system 1 proceeds to step S111 described later. Transition.

  In step S107, when an instruction signal for instructing termination is input from the input unit 65 (step S107: Yes), the endoscope system 1 proceeds to step S108 described later. On the other hand, when the instruction | indication signal which instruct | indicates completion is not input from the input part 65 (step S107: No), the endoscope system 1 transfers to step S105 mentioned above.

  In step S <b> 108, the processor control unit 66 outputs a notice flag indicating that the first power supply voltage A and the second power supply voltage B supplied from the power supply unit 61 to the endoscope 2 are stopped to the scope control unit 58.

  Subsequently, the first power supply control unit 583 stops the first drive voltage a supplied from the first power supply voltage generation unit 55 to the drive signal generation unit 54, so that the drive signal generation unit 54 supplies the first chip 21. The driving signal to be stopped is stopped (step S109).

  Thereafter, the second power supply control unit 661 stops the first power supply voltage A and the second power supply voltage B that the power supply unit 61 supplies to the endoscope 2 (step S110). After step S110, the endoscope system 1 ends this process.

  FIG. 4 is a diagram schematically illustrating a timing chart of a normal shutdown sequence executed by the endoscope system 1. Specifically, FIG. 4 corresponds to the above-described steps S108 to S110. 4, (a) shows the state of the processor 6, (b) shows the timing of the power supply stop signal, and (c) shows the stop timing of the first power supply voltage A supplied by the power supply unit 61. (D) shows the stop timing of the second power supply voltage B supplied by the power supply unit 61, (e) shows the drive timing of the first chip 21, and (f) is outputted from the first chip 21. (G) shows the stop timing of the first drive voltage a.

As shown in FIG. 4, when the processor control unit 66 outputs a power supply stop signal including a notice flag indicating that the first power supply voltage A and the second power supply voltage B are stopped to the scope control unit 58 (time t ₁ ). The first power supply control unit 583 stops the first drive voltage a supplied from the first power supply voltage generation unit 55 to the drive signal generation unit 54, thereby driving the drive signal generation unit 54 to supply to the first chip 21. Stop the signal. As a result, the driving of the first chip 21 is stopped (time t ₂ ).

Subsequently, the second power supply control unit 661 stops the first power supply voltage A and the second power supply voltage B that the power supply unit 61 supplies to the endoscope 2 (time t ₃ ). Thereby, the endoscope 2 stops when the power supply voltage supplied from the processor 6 stops (time t ₄ ). In this case, the processor 6 is completely turned off after the state becomes the pre-off state.

Returning to FIG. 3, the description from step S111 is continued.
In step S111, the first determination unit 581 determines whether or not the current value detected by the detection unit 57 is less than the second threshold value. When the first determination unit 581 determines that the current value detected by the detection unit 57 is less than the second threshold value (step S111: Yes), the endoscope system 1 proceeds to step S112 described later. On the other hand, when the first determination unit 581 determines that the current value detected by the detection unit 57 is not less than the second threshold value (step S111: No), the endoscope system 1 proceeds to step S114 described later. Transition.

  In step S <b> 112, the output unit 582 outputs an error signal including an error flag indicating that an overcurrent has occurred in the first drive voltage a supplied from the first power supply voltage generation unit 55 to the processor 6.

  Subsequently, the processor control unit 66 displays a warning indicating that an overcurrent has occurred in the first drive voltage a supplied from the first power supply voltage generation unit 55 on the display device 7 via the image signal processing unit 62. (Step S113). Accordingly, the user can intuitively grasp that an overcurrent is generated in the endoscope 2, so that the endoscope 2 can be quickly moved from the subject while viewing the image displayed on the display device 7. Can be removed. After step S113, the endoscope system 1 proceeds to step S107.

  In step S <b> 114, the output unit 582 outputs an error signal including an error flag indicating that an overcurrent has occurred in the first drive voltage a supplied from the first power supply voltage generation unit 55 to the processor 6.

  Subsequently, the endoscope system 1 executes an overcurrent detection process for the overcurrent generated in the first drive voltage a supplied from the first power supply voltage generation unit 55 (step S115). After step S115, the endoscope system 1 ends this process.

  FIG. 5 is a flowchart showing an overview of the overcurrent detection process in step S115 of FIG. FIG. 6 is a diagram schematically illustrating a timing chart in the sequence of the overcurrent detection process executed by the endoscope system 1. 6, (a) shows the state of the endoscope 2 from the upper stage, (b) shows the occurrence timing of the overcurrent detected by the detection unit 57, and (c) shows the drive timing of the imaging unit 20. , (D) shows the timing of the imaging signal output from the first chip 21, (e) shows the stop timing of the first drive voltage a to the first chip 21, and (f) shows the timing to the receiving unit 51. The stop timing of the first drive voltage a is shown, (g) shows the timing of the error signal including the error flag output by the output unit 582, and (h) shows the first drive voltage to the peripheral circuit in the connector unit 5. (i) shows the timing of the power supply stop signal, (j) shows the stop timing of the first power supply voltage A supplied by the power supply unit 61, and (k) is supplied by the power supply unit 61. First Indicating the stop timing of the power supply voltage B.

As shown in FIG. 5, the first power supply control unit 583 stops the first drive voltage a supplied from the first power supply voltage generation unit 55 to the drive signal generation unit 54, so that the drive signal generation unit 54 performs the first operation. The drive signal supplied to the chip 21 is stopped (step S201). Specifically, as illustrated in FIG. 6, when the detection unit 57 detects an overcurrent that is equal to or greater than the second threshold (time t ₁₁ ), the first power supply control unit 583 includes the first power supply voltage generation unit 55. by stopping the first drive voltage a supply to the drive signal generator 54, the drive signal generating unit 54 stops the drive signal supplied to the first chip 21 (time t _12).

Subsequently, the output unit 582 outputs an error signal including an error flag indicating that an overcurrent has occurred in the first drive voltage a supplied from the first power supply voltage generation unit 55 to the processor 6 (step S202). Specifically, as illustrated in FIG. 6, the output unit 582 outputs an error signal including an error flag indicating that an overcurrent has occurred in the first drive voltage a supplied from the first power supply voltage generation unit 55. 6 (time t ₁₃ ).

Thereafter, the first power supply control unit 583 stops the supply of the first drive voltage a that the first power supply voltage generation unit 55 supplies to the drive signal generation unit 54, the reception unit 51, and the first chip 21 (step S203). ). Specifically, as illustrated in FIG. 6, the first power supply control unit 583 includes a first drive that the first power supply voltage generation unit 55 supplies to each of the drive signal generation unit 54, the reception unit 51, and the first chip 21. The supply of the voltage a is stopped (time t ₁₃ ).

  Subsequently, the processor control unit 66 displays a warning indicating that an overcurrent has occurred in the first drive voltage a supplied from the first power supply voltage generation unit 55 on the display device 7 via the image signal processing unit 62. (Step S204).

Thereafter, the processor control unit 66 outputs a notice flag indicating that the first power supply voltage A and the second power supply voltage B are stopped to the scope control unit 58 (step S205). Specifically, as shown in FIG. 6, the processor control unit 66 outputs a power supply stop signal which is a notice flag indicating that the first power supply voltage A and the second power supply voltage B are stopped to the scope control unit 58 ( Time t ₁₄ ).

Subsequently, the second power supply control unit 661 stops the first power supply voltage A and the second power supply voltage B supplied from the power supply unit 61 to the endoscope 2 (step S206). Specifically, as shown in FIG. 6, the first power supply voltage A and the second power supply voltage B supplied from the power supply unit 61 to the endoscope 2 are stopped (time t ₁₅ ). As a result, the first power supply voltage generation unit 55 stops the first drive voltage a supplied to the peripheral circuit (time t ₁₆ ). As a result, the endoscope 2 changes from the pre-off state to the complete off state when the power supply voltage supplied from the processor 6 stops. After step S206, the endoscope system 1 returns to the main routine of FIG.

  According to the embodiment of the present invention described above, the current value detected by the detection unit 57 by the first determination unit 581 after the supply of the second power from the second power supply voltage generation unit 56 is started is abnormal. When it is determined that there is an overcurrent, the first power supply control unit 583 stops the first drive voltage a supplied to the imaging unit 20 by the first power supply voltage generation unit 55, so that an overcurrent occurs during examination of the subject. Even so, an overcurrent can be dealt with early.

  In addition, according to the embodiment of the present invention, after the first power supply controller 583 causes the second power supply voltage generator 56 to start supplying the second drive voltage b, the first power supply voltage generator 55 Since the supply of the one drive voltage a is started, it is possible to prevent an overcurrent that may occur immediately after the endoscope system 1 is started from flowing into the imaging unit 20.

  In addition, according to the embodiment of the present invention, when the first determination unit 581 determines that the current value is abnormal, the output unit 582 supplies the first drive voltage supplied by the first power supply voltage generation unit 55. Information indicating that a is abnormal is output to the processor 6, and the second power supply control unit 661 stops the first power supply voltage A and the second power supply voltage B supplied by the power supply unit 61. It is possible to reliably prevent the imaging unit 20 from being damaged by flowing into the unit 20.

  In addition, according to the embodiment of the present invention, when the first determination unit 581 determines that the current value is abnormal, the first drive voltage a that the first power supply voltage generation unit 55 supplies to the imaging unit 20. Therefore, it is possible to prevent an overcurrent from flowing into the imaging unit 20.

  Further, according to the embodiment of the present invention, the connector unit 5 includes the first power supply voltage generation unit 55, the detection unit 57, the first determination unit 581, the first power supply control unit 583, and the second power supply voltage generation unit 55. Since each is provided, the diameter of the insertion portion 100 can be reduced.

  In addition, according to the embodiment of the present invention, the second power supply control unit 661 starts the supply of the first power supply voltage A after the power supply unit 61 starts the supply of the second power supply voltage B. The activation time of the endoscope system 1 can be shortened, and the operability can be improved.

  In the embodiment of the present invention, each of the first power supply voltage generation unit 55, the detection unit 57, the first determination unit 581, the first power supply control unit 583, and the second power supply voltage generation unit 55 is connected to the connector unit 5. However, the present invention is not limited to this. For example, the operation unit 4 includes a first power supply voltage generation unit 55, a detection unit 57, a first determination unit 581, a first power supply control unit 583, and a second power supply voltage generation unit 55. Each of these may be provided.

(Other embodiments)
In the present embodiment, the endoscope system includes an endoscope that is inserted into a subject. However, for example, an endoscope system that includes a rigid endoscope, a sinus endoscope, and an electric Even an endoscope system such as a scalpel or an inspection probe can be applied.

  Further, the present invention is not limited to the above-described embodiment as it is, and in the implementation stage, the constituent elements can be modified and embodied without departing from the gist of the invention. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, some components may be deleted from all the components described in the above-described embodiment. Furthermore, you may combine suitably the component demonstrated by each embodiment and the modification.

  In addition, a term described together with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term anywhere in the specification or the drawings. Thus, various modifications and applications are possible without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Endoscope system 2 Endoscope 3 Transmission cable 4 Operation part 5 Connector part 6 Processor 7 Display apparatus 8 Light source device 20 Imaging part 21 1st chip 22 2nd chip 23 Light-receiving part 24 Reading part 25 Timing generation part 27 Buffer 51 Reception unit 52 A / D conversion unit 53 Imaging signal processing unit 54 Drive signal generation unit 55 First power supply voltage generation unit 56 Second power supply voltage generation unit 57 Detection unit 58 Scope control unit 61 Power supply unit 62 Image signal processing unit 63 Clock generation Unit 64 recording unit 65 input unit 66 processor control unit 100 insertion unit 101 distal end unit 102 base end 581 first determination unit 582 output unit 583 first power supply control unit 661 second power supply control unit

Claims (6)

An imaging unit that generates an imaging signal by receiving light and performing photoelectric conversion;
A first power supply voltage generation unit that generates at least a first drive voltage for driving the imaging unit based on a first power supply voltage input from the outside and supplies the first driving voltage to the imaging unit;
A transmission path for transmitting the first drive voltage generated by the first power supply voltage generation unit to the imaging unit;
A detection unit for detecting a current value on a transmission path for transmitting the first drive voltage generated by the first power supply voltage generation unit;
A determination unit that determines whether or not the current value detected by the detection unit is abnormal;
A first power supply controller that controls the first drive voltage supplied by the first power supply voltage generator;
Based on a second power supply voltage having a voltage different from the first power supply voltage input from the outside, a second drive voltage having a voltage different from the first drive voltage is generated and supplied to at least the first power supply controller. Two power supply voltage generators;
With
When the current value is determined to be abnormal by the determination unit in a state where the second power supply voltage generation unit supplies the second drive voltage, the first power supply control unit An endoscope, wherein a power supply voltage generation unit stops the first drive voltage supplied to the imaging unit.   The first power supply control unit causes the first power supply voltage generation unit to start supplying the first drive voltage after causing the second power supply voltage generation unit to start supplying the second drive voltage. The endoscope according to claim 1.   When the determination unit determines that the current value is abnormal, the output unit further outputs information indicating that the first drive voltage supplied from the first power supply voltage generation unit is abnormal. The endoscope according to claim 1 or 2, wherein the endoscope is configured as described above. Further comprising an imaging signal processing unit that performs signal processing on the imaging signal and outputs the signal to the outside,
The first power supply voltage generation unit further supplies the first drive voltage to the imaging signal processing unit,
The first power supply control unit stops the first drive voltage supplied from the first power supply voltage generation unit to the imaging unit when the determination unit determines that the current value is abnormal. The endoscope according to any one of claims 1 to 3. A tip that can be inserted into the subject;
A connector part detachably attachable to a processor that performs image processing on the imaging signal;
Further comprising
The imaging unit is provided at the tip,
The first power supply voltage generation unit, the detection unit, the determination unit, the first power supply control unit, and the second power supply voltage generation unit are provided in the connector unit, respectively. The endoscope according to any one of -4. A power supply unit that supplies a first power supply voltage and a second power supply voltage that are different from each other to an endoscope connected from outside,
A second power supply control unit for starting the supply of the first power supply voltage after starting the supply of the second power supply voltage to the power supply unit;
A processor comprising:

Images