Circuit board, image sensor, and manufacturing method for image sensor

Abstract

This circuit board comprises: a power source input connector (121) that has a first input pin into which a power source voltage is input; a power source output connector (122) that has a first output pin which outputs the power source voltage to a latter-stage circuit board; a switch (124) that forms a short-circuit or disconnects between the first input pin and the first output pin; and a power source IC (123) that generates a first voltage from the power source voltage supplied to the first input pin. The power source output connector (122) further has a second output pin that is connected to a control terminal of the switch (124), and a fourth output pin that outputs the first voltage, and when a power source input connector (121) of the latter-stage circuit board is connected, the first voltage is supplied to the control terminal for the switch via the second output pin and the fourth output pin being short-circuited within the latter-stage circuit board, thereby short-circuiting the switch (124).

Description

Circuit board, image sensor, and method of manufacturing the image sensor

[0001] The present disclosure relates to a circuit board, an image sensor, and a method for manufacturing an image sensor.

[0002] In image sensors that read images using sensor ICs (Integrated Circuits) arranged in the longitudinal direction, as the sensor units become longer and faster, the signal processing units include a large number of signal processing ICs such as FPGAs (Field Programmable Gate Arrays) and AFEs (Analog Front Ends).Since the number of signal processing ICs that can be mounted on a single circuit board is limited, they are mounted on multiple circuit boards (see, for example, Patent Document 1).

[0003] The image reading device described in Patent Document 1 is a linear image sensor in which multiple sensor chip groups, each with sensor chips aligned in the main scanning direction, are arranged parallel to each other at different positions in the sub-scanning direction, and includes a power supply control unit that supplies power to each sensor chip group and a circuit board including a signal processing IC. It is explained that the power supply control unit can reduce power consumption by switching the power supply according to the operating mode selected by the main body control unit.

[0004] JP 2011-254356 A

[0005] Power is supplied from outside the image sensor to the multiple circuit boards on which the sensor chips or signal processing ICs are mounted, for example, via a power supply connector provided on the cover. In this case, in order to connect the power supply connector provided on the cover to each of the circuit boards mounted on the frame with a cable, it is necessary to route a large number of cables through the narrow space inside the housing of the image sensor, which creates the problem of complicated cable connection work.

[0006] The present disclosure has been made in consideration of the above-described circumstances, and aims to provide a circuit board, an image sensor, and a method for manufacturing an image sensor that can reduce the number of cables for supplying power from an external source and simplify the connection work.

[0007] To achieve the above object, the circuit board of the present disclosure includes a power input connector having a first input pin to which a power supply voltage is input, a power output connector having a first output pin that outputs the power supply voltage to a subsequent circuit board, a switch that short-circuits or disconnects the first input pin and the first output pin, and a power supply IC that generates a first voltage different from the power supply voltage supplied to the first input pin from the power supply voltage supplied to the first input pin. The power output connector further has a second output pin connected to a control terminal of the switch and a fourth output pin that outputs the first voltage. When the power input connector of the subsequent circuit board is connected to the power output connector, the second output pin and the fourth output pin are short-circuited within the subsequent circuit board, thereby supplying the first voltage to the control terminal of the switch and shorting the switch.

[0008] According to the present disclosure, when a downstream circuit board is connected, the switch is short-circuited and power supply voltage is supplied to the downstream circuit board, thereby reducing the number of cables supplying power from outside and simplifying the connection work.

[0009] 1 is a cross-sectional view showing wiring between substrates of an image sensor according to an embodiment of the present disclosure; 2 is a top view showing connections between circuit boards for image processing of the image sensor; 3 is a diagram showing an example of a circuit configuration of a power supply circuit; 4 is a diagram showing connections between adjacent circuit boards; 5 is a flowchart showing a manufacturing method of an image sensor;

[0010] An image sensor 1 according to an embodiment of the present disclosure will be described below with reference to the drawings. The image sensor 1 is a line sensor in which sensor ICs are arranged in a linear fashion, such as a contact image sensor (CIS) in which the sensor ICs, a light source, and a lens array are integrated.

[0011] 1 is a cross-sectional view illustrating inter-substrate wiring of an image sensor 1 according to the present embodiment. The longitudinal direction of the image sensor 1 is the X-axis direction, the lateral direction is the Y-axis direction, and the height direction perpendicular to the longitudinal and lateral directions is the Z-axis direction. The longitudinal and lateral directions of the image sensor 1 according to the present embodiment correspond to the main scanning direction and sub-scanning direction of the image sensor 1, respectively.

[0012] 1, the image sensor 1 includes a frame 70 that holds optical components and signal processing boards 10, 21 to 23, and a cover 80 that covers the entire frame 70. Fixed to the cover 80 are, for example, a power supply connector 51 that supplies power to each board in the image sensor 1, a cooling fan 53, a board 40 that generates and outputs an image signal of a predetermined standard, and a board 41 that performs overall control of the image sensor 1. The frame 70 and the cover 80 are made of, for example, aluminum.

[0013] The boards 21 and 22 fixed to the frame 70 are boards having an A / D (Analog to Digital) conversion circuit that converts analog signals output by the sensor IC into digital signals. One or more boards 21 and one or more boards 22 are arranged in the main scanning direction. The boards 21 and 22 have different lengths in the main scanning direction, and the number of boards 21 and boards 22 is selected depending on the overall length of the image sensor 1 in the main scanning direction.

[0014] Boards 10a to 10d (hereinafter, sometimes collectively referred to as boards 10) are fixed to each of boards 21 and 22 via spacers 11. Boards 10a to 10d are circuit boards that apply necessary image processing to the digital signals output by boards 21 and 22, and boards 10a to 10d are synchronized with each other and input and output control signals.

[0015] The number of substrates 10 is arbitrary, but should be at least two, depending on the number of pixels in the main scanning direction required for the image sensor 1. Figure 1 shows a case where there are two substrates 21, two substrates 22, and four substrates 10, substrates 10a to 10d.

[0016] The frame 70 of the image sensor 1 may further include a light source for irradiating light onto the object to be read and a substrate 23 for controlling the light source. The light source is, for example, an LED (Light Emitting Diode).

[0017] The board 40 fixed to the cover 80 is connected to the boards 10a to 10d by wiring, and converts the image signals processed by the boards 10a to 10d into a signal of a predetermined standard and outputs the signal to the outside. The standard of the signal output to the outside is arbitrary, and examples thereof include CameraLink (registered trademark), CoaXPress (registered trademark), GigE Vision (registered trademark), and USB3Vision (registered trademark).

[0018] Furthermore, the board 41 fixed to the cover 80 is a board having a microcomputer that centrally manages the entire image sensor 1, and is connected to the boards 10 and 40 by wiring, and transmits and receives control signals to and from the boards 10 and 40. In the following description, the boards 10 and 23 on the frame 70 side may be collectively referred to as the circuit board, and the boards 40 and 41 on the cover 80 side may be collectively referred to as the control board.

[0019] The operation of the image sensor 1 is as follows. First, the sensor IC receives light emitted from a light source that is transmitted through or reflected from an object to be read, and outputs an analog signal. The A / D conversion circuits on the boards 21 and 22 convert the analog signal input from the sensor IC into a digital signal. The converted digital signal undergoes signal processing, including rearrangement of image data, on the boards 10a to 10d, and is transmitted to the board 40 via wiring. The board 40 converts the received image signal into a predetermined standard and outputs it to the outside.

[0020] Furthermore, the board 40 receives a control signal input from the outside and outputs it to the microcomputer on the board 41. Based on the received control signal, the microcomputer on the board 41 transmits a control signal to the boards 10a to 10d through wiring, thereby controlling the boards 10a to 10d.

[0021] In order to realize such operation of each board of the image sensor 1, a power supply voltage is supplied from the outside and is supplied to each board via a power supply connector 51 and cables 15 to 17. For example, as shown in FIG. 1, a power supply voltage V between +10 V and 30 V is supplied from the outside to the power supply connector 51. １ is input to the first circuit board, board 10b (first circuit board), via cable 15, is input to the second circuit board, board 10a (second circuit board), via cable 16, and is further input to the third circuit board, board 23 for light source control, via cable 16. In addition, the first voltage V ２ is supplied to the board 41, which is the control board on the cover 80 side, via the cable 17, and the first voltage V ２ is supplied to the board 40, which is the control board on the cover 80 side, via a cable 17.

[0022] 1, a power supply voltage V of +10 V or more but less than 30 V is supplied to a power supply connector 51 from the outside. １ is input to the first circuit board, board 10c (first circuit board), via cable 15, is input to the second circuit board, board 10d (second circuit board), via cable 16, and is further input to the third circuit board, board 23 for light source control, via cable 16. In addition, the first voltage V ２ is supplied to a board 40, which is a control board on the cover side, via a cable 17.

[0023] 1, a cable 15 supplies a power supply voltage V from an externally connected power supply connector 51 to a circuit board 10 on the frame 70 side. １ The cable 16 is a first cable that supplies the power supply voltage V １ The cable 17 supplies the first voltage V from the board 10 on the frame 70 side to the boards 40 and 41, which are control boards on the cover 80 side. ２ This is the third cable that supplies

[0024] FIG. 2 is a top view schematically illustrating an example of the power supply to the image processing boards 10a-10d and the light source control board 23, and the circuits related to image processing. In FIG. 2, the boards 10a-10d have the same circuits, but components that are not mounted are indicated by dashed lines. As illustrated in FIG. 2, the board 10 is equipped with components related to image processing, including a main clock 101, a buffer 102 that conditions the source clock signal output from the main clock 101, a connector 103 for transmitting and receiving signals between the boards, a buffer 104 that conditions signals input from a previous board, a buffer 105 that conditions signals to be sent to a subsequent board, and a signal processing IC. The signal processing IC is, for example, an FPGA 106.

[0025] Each board 10 further includes a power supply circuit 120. The power supply circuit 120 receives a power supply voltage V of +10 V or more and less than +30 V from the outside of the board 10. １ and a power supply voltage V １ a power supply output connector 122 that outputs a power supply voltage V; a switch 124 that can short-circuit and cut-off the power supply input connector 121 and the power supply output connector 122; １ a first voltage V that is equal to or greater than +3 V and less than +7 V ２ and a power supply IC 123 for converting the

[0026] 3 is a diagram showing an example of the circuit configuration of the power supply circuit 120. The power input connector 121 has at least four connection pins. As shown in FIG. 3, the first input pin of the power input connector 121 receives a power supply voltage V １ is input from the power supply connector 51 provided on the cover 80 via a cable 15, or from the board 10, which is the circuit board at the previous stage, via a cable 16. １ In the example of FIG. 3, a power supply voltage V of 24 V is input. １ is input to the first input pin.

[0027] The second and fourth input pins of the power input connector 121 are short-circuited as shown in Fig. 3. That is, the power supply circuit 120 includes a short circuit that shorts the second and fourth input pins. The third input pin of the power input connector 121 is connected to the power supply voltage V １ 3, the first to fourth input pins correspond to numbers 1 to 4 of the power input connector 121 in order, but the arrangement order of the first to fourth input pins is arbitrary.

[0028] The power output connector 122 has at least four connection pins. The first output pin of the power output connector 122 outputs a power supply voltage V １ and connects the power supply voltage V to the subsequent circuit board 10 or 23 via the cable 16. １ In the example of FIG. 3, a power supply voltage V １ is output from the first output pin. The third output pin of the power output connector 122 is connected to the ground within the circuit board. Note that in Figure 3, numbers 1 to 4 on the power output connector 122 correspond in order to the first to fourth output pins, but the arrangement order of the first to fourth output pins is arbitrary. However, the arrangement order of the first to fourth input pins of the power input connector 121 and the first to fourth output pins of the power output connector 122 are the same.

[0029] The power supply IC 123 receives a power supply voltage V between +10V and +30V. １ a first voltage V that is equal to or greater than +3 V and less than +7 V ２ The first voltage V generated by the power supply IC 123 is an arbitrary component that converts the first voltage V into a voltage V, and includes, for example, a DC / DC converter. ２ is used in the circuit board and is output from the fourth output pin of the power supply output connector 122 via a resistor 125. Furthermore, the first voltage V ２ is supplied from the first voltage output connector 128 to the boards 40 and 41 on the cover 80 side via the cable 17.

[0030] The switch 124 is any switch, such as a FET (Field Effect Transistor), that has the function of short-circuiting and disconnecting the first input pin of the power input connector 121 and the first output pin of the power output connector 122. The FET gate terminal, which is the control terminal of the switch 124, is connected to the second output pin of the power output connector 122 via a resistor 126. The second output pin of the power output connector 122 is connected to ground via a resistor 127. The switch 124 applies a first voltage V ２ is applied, and is disconnected when the control terminal is at ground level.

[0031] 4 is a diagram showing a state in which boards 10a and 10b, which are circuit boards including the power supply circuit 120 shown in FIG. 3, are connected to each other by a cable 16. The power input connector 121 of the first board 10b (first circuit board) is connected to an external power supply connector 51 via a cable 15, and a power supply voltage V １ (+24V) is supplied to the power supply, and the ground voltage is supplied to the third input pin. １ is used for signal processing within the circuit board and is also input to the power supply IC 123 and the switch 124.

[0032] The power supply IC 123 supplies a power supply voltage V １ to the first voltage V ２ (+5V) to generate the first voltage V ２ is used for control, processing, etc. within the circuit board, and is supplied from the first voltage output connector 128 to the boards 40 and 41, which are control boards, via the cable 17. In addition, the first voltage V ２ is outputted to the subsequent circuit board from the fourth output pin of the power output connector 122 via a resistor 125.

[0033] The power output connector 122 of the first board 10b (first circuit board) and the power input connector 121 of the second board 10a (second circuit board) are connected to each other via a cable 16. Since the second input pin and the fourth input pin of the power input connector 121 are short-circuited within the board 10a, when the boards 10b and 10a are connected via the cable 16, the fourth output pin and the second output pin of the power output connector 122 of the board 10b are short-circuited, and the first voltage V ２ is entered.

[0034] The first voltage V input to the fourth output pin ２ is input to the control terminal of the switch 124 via the second output pin, the switch 124 is short-circuited, and the power supply voltage V is output from the first output pin of the power supply output connector 122 on the board 10b. １ is output and input to the second board 10a. Similarly, when a circuit board is connected to the subsequent stage on the board 10a, the power supply voltage V １ will be output.

[0035] On the other hand, when the subsequent circuit board is not connected to the power output connector 122 of the circuit board, the second output pin of the power output connector 122 is at the ground voltage, the switch 124 is turned off, and the power supply voltage V １ output will stop.

[0036] In this way, by providing the power supply circuit 120 shown in FIGS. 3 and 4 on the circuit board 10, the power supply voltage V supplied from the power supply connector 51 of the cover 80 as shown in FIG. １ is supplied to the first board 10b via a cable 15, and is then supplied to the second board 10a and the light source control board 23 via a cable 16. As shown in FIG. 2, the power supply voltage V １ is supplied to the first board 10c via cable 15, and is then sequentially supplied to the second board 10d and the light source control board 23 via cable 16. The last stage light source control board 23 may include a power supply circuit 120, or may include only a power input connector 121.

[0037] A method for manufacturing the image sensor 1 configured as above will be described with reference to the flowchart of FIG.

[0038] First, a circuit board is fixed to the frame 70 to which the sensor IC shown in Fig. 1 is fixed (step S101, board fixing step). Specifically, boards 21 and 22 having A / D conversion circuits are fixed to the frame 70 along the arrangement direction of the sensor IC, i.e., the main scanning direction, and boards 10a to 10d, which are circuit boards, are fixed to each of the boards 21 and 22 via spacers 11. At this time, the boards 10a to 10d are connected to each other by cables 110 that transmit and receive signals for image processing and synchronization. Then, board 23 is fixed to the frame 70.

[0039] Thereafter, the circuit boards 10a to 10d and the board 23 are connected to each other by cables 16 (step S102, inter-circuit board connecting step). Specifically, in the example of Figures 1 and 2, the power output connector 122 of the board 10b is connected to the power input connector 121 of the board 10a, the power output connector 122 of the board 10a is connected to the power input connector 121 of the board 23, the power output connector 122 of the board 10c is connected to the power input connector 121 of the board 10d, and the power output connector 122 of the board 10d is connected to the power input connector 121 of the board 23 by cables 16, respectively.

[0040] Next, the boards 40 and 41, which are the control boards on the cover side, are connected to the board 10 by a cable 17. Furthermore, the power supply connector 51 is connected to the first circuit boards 10b and 10c by a cable 15 (step S103, power supply connector connecting step). Thereafter, the cover 80 is fixed to the frame 70 (step S104), and the process is completed.

[0041] In this way, the circuit boards on the frame 70 side are connected in series using short power supply cables 16, and then connected to the power supply connector 51 on the cover 80. Therefore, compared to connecting cables from the power supply connector 51 on the cover 80 to each of the circuit boards on the frame 70 side, the number of cables routed from the power supply connector 51 can be reduced, and the number of pins on the power supply connector 51 can also be reduced.

[0042] Furthermore, when connecting cables from the power supply connector 51 to each circuit board on the frame 70 side, it is necessary to route and connect a large number of cables in the narrow space inside the housing of the image sensor 1, which makes the work complicated and costly, and also increases the amount of work, which makes it more likely to lead to errors. In contrast, with the circuit board according to this embodiment, adjacent circuit boards are connected by short cables 16, which simplifies the work of connecting cables for power supply when assembling the image sensor 1. Furthermore, when a subsequent circuit board is not connected, the switch 124 is turned off and the power supply voltage V is output from the power output connector 122. １ Since the signal is not output, the possibility of the image sensor 1 failing can be reduced.

[0043] As described above, the image sensor 1 according to this embodiment includes a power supply circuit 120 on each of the circuit boards including the board 10 that processes the image signal acquired from the sensor IC and the board 23 for controlling the LEDs. １ a power supply input connector 121 having a first input pin to which a power supply voltage V １ a power supply output connector 122 having a first output pin for outputting a power supply voltage V; a switch 124 for short-circuiting and disconnecting the first input pin and the first output pin; １ From the first voltage V ２ The power output connector 122 includes a second output pin connected to the control terminal of the switch 124 and a power supply IC 123 that generates a first voltage V ２When the power output connector 122 is connected to the power input connector 121 of the subsequent circuit board, the second output pin and the fourth output pin are short-circuited in the subsequent circuit board, and a first voltage V is applied to the control terminal of the switch 124. ２ is supplied to the circuit board at the subsequent stage, shorting the switch 124, and the power supply voltage V １ This will reduce the number of cables that need to be routed from the power supply connector, making it possible to simplify installation work.

[0044] The hardware configuration and flowcharts shown in the above embodiment are merely examples and can be modified and adapted as desired. For example, in the above embodiment, power is supplied from the power supply connector 51 provided on the cover 80 to the two boards 10b and 10c on the frame 70 side, power is sequentially supplied from board 10b to boards 10a and 23 connected in series, and power is supplied from board 10c to boards 10d and 23 connected in series. However, the number of circuit boards connected to the power supply connector 51 and the number of circuit boards connected in series can be arbitrary. Figures 6 and 7 show modified examples in which the circuit boards are connected in a different manner from the above embodiment. Figures 6 and 7 are top views showing the connection of the circuit boards in an image sensor 1 according to the modified example.

[0045] In the image sensor shown in FIG. 6, the power supply voltage V is supplied to the power supply connector 51 provided on the cover 80. １ is input to the first circuit board, board 10a, via cable 15, and is transmitted from board 10a to the second circuit board, board 10b, the third circuit board, board 10c, and the fourth circuit board, board 10d, via cable 16. １ In this way, the number of circuit boards connected in series by the cable 16 is arbitrary, for example, four or eight. In this case, the first voltage V generated on at least one of the circuit boards 10a to 10d is ２ may be supplied to the boards 40 and 41 on the cover 80 side by the cable 17 .

[0046] In the case of the connection shown in FIG. 7, the power supply voltage V １ are input to the first circuit board 10a and the third circuit board 10c via cables 15. The power supply voltage V １ Similarly, the power supply voltage V is input from the board 10d to the subsequent circuit boards 10e to 10h via the cable 16. １ In this way, the number of power supply connectors 51 provided on the cover 80 and the power supply voltage V １ The number of circuit boards to which the first voltage V is supplied and the number of circuit boards connected in series by the cable 16 are arbitrary. In this case, the first voltage V generated on at least one of the circuit boards 10a to 10h is ２ may be supplied to the boards 40 and 41 on the cover 80 side by the cable 17 .

[0047] Various aspects of the present disclosure are summarized below as appendices.

[0048] (Supplementary Note 1) A circuit board comprising: a power input connector having a first input pin to which a power supply voltage is input; a power output connector having a first output pin that outputs the power supply voltage to a subsequent circuit board; a switch that can short-circuit and disconnect the first input pin and the first output pin; and a power supply IC that generates a first voltage different from the power supply voltage supplied to the first input pin from the power supply voltage supplied to the first input pin, wherein the power output connector further has a second output pin connected to a control terminal of the switch and a fourth output pin that outputs the first voltage, and when the power input connector of the subsequent circuit board is connected to the power output connector, the second output pin and the fourth output pin are short-circuited within the subsequent circuit board, thereby supplying the first voltage to the control terminal of the switch and shorting the switch.

[0049] (Supplementary Note 2) A circuit board comprising: a power input connector having a first input pin to which a power supply voltage is input; a power output connector having first, second, and fourth output pins; a switch capable of short-circuiting and disconnecting the first input pin and the first output pin; and a power supply IC that generates a first voltage from the power supply voltage supplied to the first input pin, wherein the second output pin is connected to a control terminal of the switch; and the fourth output pin outputs the first voltage, and when the second output pin and the fourth output pin are short-circuited, the first voltage is supplied to the control terminal of the switch, thereby short-circuiting the switch.

[0050] (Supplementary Note 3) The circuit board according to Supplementary Note 1 or Supplementary Note 2, wherein the power input connector further has a second input pin and a fourth input pin, and further comprises a short circuit that shorts the second input pin and the fourth input pin.

[0051] (Supplementary Note 4) The circuit board described in any one of Supplementary Note 1 to Supplementary Note 3, wherein the power supply input connector further has a third input pin to which a ground voltage of the power supply is supplied, and the power supply output connector further has a third output pin to which the same ground voltage as that of the third input pin is output.

[0052] (Supplementary Note 5) An image sensor comprising: the circuit board according to any one of Supplementary Notes 1 to 4, wherein the image sensor comprises: two or more circuit boards including a first circuit board and a second circuit board; a first cable that supplies the power supply voltage to the power supply input connector of the first circuit board; and a second cable that connects the power supply output connector of the first circuit board and the power supply input connector of the second circuit board.

[0053] (Supplementary Note 6) The image sensor according to Supplementary Note 5, further comprising: a frame on which two or more of the circuit boards are mounted; and a cover provided with a power supply connector to which the power supply voltage is supplied from the outside, wherein the power input connector of the first circuit board and the power supply connector are connected by the first cable.

[0054] (Supplementary Note 7) The image sensor according to Supplementary Note 5 or Supplementary Note 6, further comprising: one or more control boards that control the circuit boards; and a third cable that connects at least one of the circuit boards to the control boards and supplies the first voltage to the control boards.

[0055] (Supplementary Note 8) A method for manufacturing an image sensor including two or more circuit boards according to any one of Supplementary Note 1 to Supplementary Note 4, comprising: a board fixing step of fixing the two or more circuit boards to a frame to which sensor ICs are fixed along an arrangement direction of the sensor ICs; a circuit board connecting step of connecting the two or more circuit boards with a second cable; and a power supply connector connecting step of connecting a power supply connector provided on a cover and the power input connector of a first circuit board with a first cable.

[0056] The present disclosure allows various embodiments and modifications without departing from the broad spirit and scope of the present disclosure. Furthermore, the above-described embodiments are intended to explain the present disclosure and do not limit the scope of the present disclosure. That is, the scope of the present disclosure is defined by the claims, not the embodiments. Various modifications made within the scope of the claims and the meaning of equivalent disclosures are considered to be within the scope of the present disclosure.

[0057] This application is based on Japanese Patent Application No. 2024-91168, filed on June 5, 2024. The entire specification, claims, and drawings of Japanese Patent Application No. 2024-91168 are incorporated herein by reference.

[0058] 1 Image sensor, 10, 10a to 10h, 21, 22, 23, 40, 41 Board, 11 Spacer, 15, 16, 17 Cable, 51 Power supply connector, 53 FAN, 70 Frame, 80 Cover, 101 Main clock, 102, 104, 105 Buffer, 103 Connector, 106 FPGA, 110 Cable, 120 Power supply circuit, 121 Power input connector, 122 Power output connector, 123 Power supply IC, 124 Switch, 125, 126, 127 Resistor, 128 First voltage output connector.

Claims

1. A circuit board comprising: a power input connector having a first input pin to which a power supply voltage is input; a power output connector having a first output pin that outputs the power supply voltage to a subsequent circuit board; a switch that can short-circuit and disconnect the first input pin and the first output pin; and a power supply IC that generates a first voltage different from the power supply voltage supplied to the first input pin from the power supply voltage supplied to the first input pin, wherein the power output connector further has a second output pin connected to a control terminal of the switch and a fourth output pin that outputs the first voltage, and when the power input connector of the subsequent circuit board is connected to the power output connector, the second output pin and the fourth output pin are short-circuited within the subsequent circuit board, thereby supplying the first voltage to the control terminal of the switch and shorting the switch.

2. A circuit board comprising: a power input connector having a first input pin to which a power supply voltage is input; a power output connector having first, second, and fourth output pins; a switch capable of short-circuiting and disconnecting the first input pin and the first output pin; and a power supply IC that generates a first voltage from the power supply voltage supplied to the first input pin, wherein the second output pin is connected to a control terminal of the switch; and the fourth output pin outputs the first voltage, and when the second output pin and the fourth output pin are short-circuited, the first voltage is supplied to the control terminal of the switch, thereby shorting the switch.

3. The circuit board according to claim 1 or 2, wherein the power input connector further has a second input pin and a fourth input pin, and further comprises a short circuit that shorts the second input pin and the fourth input pin.

4. The circuit board according to any one of claims 1 to 3, wherein the power supply input connector further has a third input pin to which the ground voltage of the power supply is supplied, and the power supply output connector further has a third output pin from which the same ground voltage as that of the third input pin is output.

5. An image sensor comprising: a circuit board according to any one of claims 1 to 4, comprising two or more circuit boards including a first circuit board and a second circuit board; a first cable that supplies the power supply voltage to the power supply input connector of the first circuit board; and a second cable that connects the power supply output connector of the first circuit board and the power supply input connector of the second circuit board.

6. The image sensor according to claim 5, further comprising: a frame on which two or more of the circuit boards are mounted; and a cover provided with a power supply connector to which the power supply voltage is supplied from the outside, wherein the power input connector of the first circuit board and the power supply connector are connected by the first cable.

7. The image sensor according to claim 5 or claim 6, further comprising: one or more control boards that control the circuit boards; and a third cable that connects at least one of the circuit boards to the control boards and supplies the first voltage to the control boards.

8. A method for manufacturing an image sensor comprising two or more circuit boards according to any one of claims 1 to 4, comprising: a board fixing step of fixing two or more of the circuit boards to a frame to which a sensor IC is fixed, along the arrangement direction of the sensor IC; a circuit board connecting step of connecting the two or more circuit boards with a second cable; and a power supply connector connecting step of connecting a power supply connector provided on a cover to the power input connector of a first circuit board with a first cable.

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