Contact image sensor and method for manufacturing a contact image sensor

Abstract

The circuit board includes a power input connector (121) having a first input pin to which a power supply voltage is input, a power output connector (122) having a first output pin to which a power supply voltage is output to a subsequent circuit board, a switch (124) for short-circuiting or disconnecting the first input pin and the first output pin, and a power supply IC (123) for generating a first voltage from the power supply voltage supplied to the first input pin. The power output connector (122) further has a second output pin connected to the control terminal of the switch (124) and a fourth output pin that outputs a first voltage. When the power input connector (121) of the subsequent circuit board is connected, the second output pin and the fourth output pin are short-circuited in the subsequent circuit board, thereby supplying a first voltage to the control terminal of the switch and short-circuiting the switch (124).

Description

Technical Field

[0001] The present disclosure relates to Close contact an image sensor and Close contact a method for manufacturing an image sensor.

Background Art

[0002] In an image sensor that reads an image using sensor ICs (Integrated Circuits) arranged in the longitudinal direction, as the sensor part becomes longer and faster, the signal processing part includes a number of signal processing ICs such as FPGA (Field Programmable Gate Array) and AFE (Analog Front End). Since the number of signal processing ICs that can be mounted on one circuit board is limited, they are mounted separately on a plurality of circuit boards (for example, Patent Document 1).

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

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Multiple circuit boards on which sensor chips or signal processing ICs are mounted receive power supplied from outside the image sensor, for example, via a power supply connector located on the cover. However, in order to connect the power supply connector on the cover to each circuit board mounted on the frame, it is necessary to route numerous cables within the limited space inside the image sensor housing, which presents the challenge of making the cable connection process complicated.

[0006] This disclosure is made in view of the circumstances described above, and is a method that can reduce the number of cables supplied with power from an external source and simplify connection work. Close contact Image sensor and Close contact The objective is to provide a method for manufacturing an image sensor. [Means for solving the problem]

[0007] To achieve the above objectives, this disclosure Contact image sensor teeth, The device comprises two or more circuit boards, including a first circuit board and a second circuit board; a frame on which the two or more circuit boards are mounted; and a cover provided with a power supply connector that receives power voltage from an external source. The first circuit board and the second circuit board are each, A power input connector having a first input pin to which the power supply voltage is input, a power output connector having a first output pin to which the power supply voltage is output, and a short circuit or disconnection between the first input pin and the first output pin. Shiuru The device comprises a switch and a power supply IC that generates a first voltage different from the power supply voltage supplied to the first input pin. The power input connector and power supply connector of the first circuit board are connected by the first cable. The power output connector further includes a second output pin connected to the switch's control terminal and a fourth output pin that outputs a first voltage. First circuit board The power output connector, 2nd When the power input connector on the circuit board is connected, First circuit board The second output pin and the fourth output pin are Within the second circuit board When short-circuited, the first voltage is supplied to the control terminal of the switch, causing the switch to short-circuit. [Effects of the Invention]

[0008] According to this disclosure, when a subsequent circuit board is connected, the switch is short-circuited and power voltage is supplied to the subsequent circuit board, thus reducing the number of external power supply cables and simplifying the connection process. [Brief explanation of the drawing]

[0009] [Figure 1] Cross-sectional view showing the inter-substrate wiring of an image sensor according to an embodiment of the present disclosure. [Figure 2] Top view showing the connection of the circuit board for image processing of the image sensor. [Figure 3] This diagram shows an example of a power supply circuit configuration. [Figure 4] Diagram showing the connection between adjacent circuit boards. [Figure 5] Flowchart showing the manufacturing method of an image sensor [Figure 6] Top view showing the connections of the modified circuit board. [Figure 7] Top view showing the connections of the modified circuit board. [Modes for carrying out the invention]

[0010] (Embodiment) The image sensor 1 according to the embodiment of this disclosure will be described below with reference to the drawings. The image sensor 1 is an arbitrary line sensor in which sensor ICs are arranged in a straight line, and is, for example, a contact image sensor (CIS) in which the sensor ICs, light source and lens array are integrated.

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

[0012] As illustrated in FIG. 1, the image sensor 1 includes a frame 70 that holds optical components and substrates 10, 21 to 23 for signal processing, and a cover 80 that covers the entire frame 70. The cover 80 is fixed with, for example, a power supply connector 51 that supplies power to each substrate in the image sensor 1, a FAN 53 for air cooling, a substrate 40 that generates and outputs an image signal of a predetermined standard, and a substrate 41 that performs overall control of the image sensor 1. The frame 70 and the cover 80 are formed of, for example, aluminum.

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

[0014] Substrates 10a to 10d (hereinafter sometimes collectively referred to as substrate 10) are fixed to each of the substrates 21 and 22 via spacers 11. The substrates 10a to 10d are circuit boards that perform image processing required for the digital signals output from the substrates 21 and 22. The substrates 10a to 10d are synchronized with each other and perform input / output of control signals.

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

[0016] The frame 70 of the image sensor 1 may further include a light source that irradiates light to 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 circuit board 40, fixed to the cover 80, is connected to circuit boards 10a to 10d by wiring, and converts the image signals processed by circuit boards 10a to 10d into a predetermined standard and outputs them externally. The standard of the signal output externally is arbitrary and can be, for example, CameraLink®, CoaXPress®, GigEVision®, or USB3Vision®.

[0018] Furthermore, the circuit board 41 fixed to the cover 80 is a circuit board containing a microcontroller that centrally manages the entire image sensor 1, and is connected to the circuit boards 10 and 40 by wiring, and transmits and receives control signals with the circuit boards 10 and 40. In the following description, the circuit boards 10 and 23 on the frame 70 side may be collectively referred to as the circuit board, and the circuit 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 the transmitted or reflected light from the light source at the object to be read and outputs an analog signal. The A / D conversion circuits on 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 boards 10a to 10d and is transmitted to board 40 through wiring. Board 40 converts the received image signal to a predetermined standard and outputs it externally.

[0020] Furthermore, board 40 receives control signals input from an external source and outputs them to the microcontroller on board 41. Based on the received control signals, the microcontroller on board 41 transmits control signals to boards 10a to 10d via wiring, thereby controlling boards 10a to 10d.

[0021] To enable the operation of each board in the image sensor 1, a power supply voltage is supplied from an external source and delivered to each board via a power supply connector 51 and cables 15-17. For example, as shown in Figure 1, a power supply voltage V1 of +10V to less than 30V supplied from an external source to the power supply connector 51 is input to the first circuit board, board 10b (first circuit board), via cable 15, to the second circuit board, board 10a (second circuit board), via cable 16, and further input to the third circuit board, board 23 for light source control, via cable 16. In addition, a first voltage V2 of +3V to less than +7V generated on the first board 10b is supplied to the control board 41 on the cover 80 side via cable 17, and a first voltage V2 generated on the second board 10a is supplied to the control board 40 on the cover 80 side via cable 17.

[0022] In Figure 1, the power supply voltage V1, which is between +10V and less than 30V supplied to the power supply connector 51 from an external source, is input to the first circuit board, board 10c (first circuit board), via cable 15, to the second circuit board, board 10d (second circuit board), via cable 16, and further input to the third circuit board, board 23 for light source control, via cable 16. In addition, the first voltage V2, which is between +3V and less than +7V, generated on the first board 10c, is supplied to the control board 40 on the cover side via cable 17.

[0023] In other words, in Figure 1, cable 15 is a first cable that supplies a power voltage V1 from an externally connected power supply connector 51 to board 10, which is a circuit board on the frame 70 side; cable 16 is a second cable that supplies a power voltage V1 to boards 10 and 23, which are downstream circuit boards on the frame 70 side; and cable 17 is a third cable that supplies a first voltage V2 from board 10 on the frame 70 side to boards 40 and 41, which are control boards on the cover 80 side.

[0024] Figure 2 is a schematic top view illustrating an example of the power supply to the image processing boards 10a to 10d and the light source control board 23, as well as the circuitry related to image processing. In Figure 2, boards 10a to 10d have the same circuitry, but components that are not mounted are shown with dashed lines. As illustrated in Figure 2, board 10 is equipped with the following components related to image processing: a main clock 101, a buffer 102 for adjusting the source-to-signal clock signals output from the main clock 101, a connector 103 for transmitting and receiving signals between boards, a buffer 104 for adjusting signals input from the preceding board, a buffer 105 for adjusting signals to be transmitted to the subsequent board, and a signal processing IC. The signal processing IC is, for example, an FPGA 106.

[0025] Each circuit board 10 is further equipped with a power supply circuit 120. The power supply circuit 120 includes a power input connector 121 to which a power supply voltage V1 of +10V or more and less than +30V is input from outside the circuit board 10, a power output connector 122 to which the power supply voltage V1 is output to a subsequent circuit board, either the circuit board 10 or the light source control circuit board 23, a switch 124 that can short-circuit and disconnect the power input connector 121 and the power output connector 122, and a power supply IC 123 that converts the power supply voltage V1 into a first voltage V2 of +3V or more and less than +7V.

[0026] Figure 3 shows 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 Figure 3, the first input pin of the power input connector 121 is a connection pin to which the power supply voltage V1 is input from outside the board. The power supply voltage V1 is input from the power supply connector 51 provided on the cover 80 via cable 15, or from the board 10, which is the preceding circuit board, via cable 16. In the example in Figure 3, a power supply voltage V1 of 24V is input to the first input pin.

[0027] As shown in Figure 3, the second and fourth input pins of the power input connector 121 are short-circuited. That is, the power supply circuit 120 includes a short-circuit circuit that short-circuits the second and fourth input pins. The third input pin of the power input connector 121 is supplied with the ground voltage of the power supply voltage V1 and is connected to the ground in the circuit board. In Figure 3, the numbers 1 to 4 of the power input connector 121 correspond sequentially to the first to fourth input pins, 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. As shown in Figure 3, the first output pin of the power output connector 122 is a connection pin that outputs a power supply voltage V1 to the outside of the board, and the power supply voltage V1 is output to the subsequent circuit board, board 10 or board 23, via cable 16. In the example in Figure 3, a power supply voltage V1 of 24V is output from the first output pin. The third output pin of the power output connector 122 is connected to the ground inside the circuit board. In Figure 3, the numbers 1 to 4 of the power output connector 122 correspond sequentially to the first to fourth output pins, but the arrangement order of the first to fourth output pins is arbitrary. However, 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 have the same arrangement order.

[0029] The power supply IC 123 is an optional component that converts a power supply voltage V1 between +10V and +30V to a first voltage V2 between +3V and +7V, including, for example, a DC / DC converter. The first voltage V2 generated by the power supply IC 123 is used within the circuit board and is also output from the fourth output pin of the power supply output connector 122 via resistor 125. Furthermore, the first voltage V2 is supplied from the first voltage output connector 128 to the circuit boards 40 and 41 on the cover 80 side via cable 17.

[0030] Switch 124 is an arbitrary switch capable 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, and is, for example, a FET (Field Effect Transistor). The FET gate terminal, which is the control terminal of switch 124, is connected to the second output pin of the power output connector 122 via resistor 126. The second output pin of the power output connector 122 is connected to ground via resistor 127. Switch 124 is short-circuited when a first voltage V2 is applied to the control terminal and disconnected when the control terminal is at ground level.

[0031] Figure 4 shows a state in which circuit boards 10a and 10b, which are circuit boards equipped with the power supply circuit 120 shown in Figure 3, are connected to each other by a cable 16. The power input connector 121 of the first circuit board 10b (first circuit board) is connected to an external power supply connector 51 via a cable 15, supplying a power supply voltage V1 (+24V) to the first input pin and a ground voltage to the third input pin. The power supply voltage V1 is used for signal processing within the circuit board and is also input to the power supply IC 123 and switch 124.

[0032] The power supply IC 123 generates a first voltage V2 (+5V) from the power supply voltage V1. The first voltage V2 is used for control and processing within the circuit board and is also supplied to control boards 40 and 41 via cable 17 from the first voltage output connector 128. The first voltage V2 is also output to the subsequent circuit boards via resistor 125 from the fourth output pin of the power supply output connector 122.

[0033] The power output connector 122 of the first circuit board 10b and the power input connector 121 of the second circuit board 10a are connected to each other via cable 16. Since the second input pin and the fourth input pin of the power input connector 121 are short-circuited within board 10a, when boards 10b and 10a are connected via cable 16, the fourth output pin and the second output pin of the power output connector 122 of board 10b are short-circuited, and the first voltage V2 is input to the fourth output pin.

[0034] The first voltage V2 input to the fourth output pin is input to the control terminal of switch 124 via the second output pin, so switch 124 is short-circuited, and the power supply voltage V1 is output from the first output pin of the power output connector 122 of board 10b and input to the second board 10a. Similarly, on board 10a, when a circuit board is connected to the next stage, the power supply voltage V1 will be output to the next stage circuit board.

[0035] On the other hand, when no subsequent circuit board is connected to the power output connector 122 of the circuit board, the second output pin of the power output connector 122 becomes ground voltage, the switch 124 is disconnected, and the output of the power supply voltage V1 stops.

[0036] As shown in Figures 3 and 4, by providing the power supply circuit 120 on the circuit board 10, the power supply voltage V1 supplied from the power supply connector 51 of the cover 80 is supplied to the first board 10b via cable 15, and then sequentially supplied to the second board 10a and the light source control board 23 via cable 16, as shown in Figure 2. Also, as shown in Figure 2, the power supply voltage V1 supplied from the power supply connector 51 of the cover 80 is supplied to the first board 10c via cable 15, and 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 be equipped with the power supply circuit 120, or it may be equipped only with the power input connector 121.

[0037] The manufacturing method of the image sensor 1 configured as described above will be explained using the flowchart in Figure 5.

[0038] First, the circuit board is fixed to the frame 70 on which the sensor IC shown in Figure 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, that is, the main scanning direction, and circuit boards 10a to 10d are fixed to each of boards 21 and 22 via spacers 11. At this time, boards 10a to 10d are connected by cables 110 that transmit and receive signals for image processing and synchronization. Furthermore, board 23 is fixed to the frame 70.

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

[0040] Next, the control boards on the cover side, boards 40 and 41, are connected to board 10 with cable 17. Furthermore, the power supply connector 51 is connected to the first circuit boards (the first circuit boards), boards 10b and 10c, with cable 15 (step S103, power supply connector connection step). After that, 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 are connected in series using a short power supply cable 16, and then connected to the power supply connector 51 on the cover 80. Therefore, compared to the case where cables are connected from the power supply connector 51 on the cover 80 to each individual circuit board on the frame 70, the number of cables to be 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 individual circuit board on the frame 70 side, it is necessary to route and connect numerous cables in the narrow space inside the housing of the image sensor 1, which makes the work complex and costly, and also increases the amount of work involved, making it prone to errors. In contrast, with the circuit board according to this embodiment, adjacent circuit boards are connected with short cables 16, which simplifies the work of connecting power supply cables when assembling the image sensor 1. In addition, when no subsequent circuit boards are connected, the switch 124 is turned off and no power supply voltage V1 is output from the power output connector 122, thus reducing the possibility of failure of the image sensor 1.

[0043] As described above, the image sensor 1 according to this embodiment is equipped with a power supply circuit 120 on each circuit board, including a board 10 for processing image signals acquired from the sensor IC or a board 23 for LED control. The power supply circuit 120 includes a power input connector 121 having a first input pin to which a power supply voltage V1 is input, a power output connector 122 having a first output pin to output the power supply voltage V1 to a subsequent circuit board, a switch 124 that can short-circuit and disconnect the first input pin and the first output pin, and a power supply IC 123 that generates a first voltage V2 from the power supply voltage V1 supplied to the first input pin. The power output connector 122 further includes a second output pin connected to the control terminal of the switch 124 and a fourth output pin that outputs a first voltage V2. When the power output connector 122 and the power input connector 121 of the subsequent circuit board are connected, the second output pin and the fourth output pin are short-circuited within the subsequent circuit board, supplying the first voltage V2 to the control terminal of the switch 124, short-circuiting the switch 124, and supplying the power supply voltage V1 to the subsequent circuit board. This reduces the number of cables that need to be routed from the power supply connector, simplifying the work.

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

[0045] In the image sensor shown in Figure 6, the power supply voltage V1 supplied to the power supply connector 51 provided on the cover 80 is input to the first circuit board, board 10a, via cable 15. From board 10a, the power supply voltage V1 is sequentially input to the second circuit board, board 10b, the third circuit board, board 10c, and the fourth circuit board, board 10d, via cable 16. The number of circuit boards connected in series via cable 16 is arbitrary, for example, four or eight. In this case, the first voltage V2 generated on at least one of the circuit boards 10a to 10d may be supplied to the boards 40 and 41 on the cover 80 side via cable 17.

[0046] Furthermore, in the connection configuration shown in Figure 7, the power supply voltage V1 supplied to the two power supply connectors 51 provided on the cover 80 is input to the first circuit boards, boards 10a and 10d, via cables 15. From board 10a, the power supply voltage V1 is sequentially input to the second circuit board, board 10b, and the third circuit board, board 10c, via cables 16. Similarly, from board 10d, the power supply voltage V1 is sequentially input to the subsequent circuit boards, boards 10e to 10h, via cables 16. Thus, the number of power supply connectors 51 provided on the cover 80, the number of circuit boards to which the power supply voltage V1 is supplied from the power supply connectors 51, and the number of circuit boards connected in series by cables 16 are arbitrary. In this case, the first voltage V2 generated on at least one of the circuit boards 10a to 10h may be supplied to the boards 40 and 41 on the cover 80 side via cables 17.

[0047] The various aspects of this disclosure are summarized below as an appendix.

[0048] (Note 1) A power input connector having a first input pin to which the power supply voltage is input, A power output connector having a first output pin that outputs the power supply voltage is provided on the subsequent circuit board. A switch capable of short-circuiting and disconnecting the first input pin and the first output pin, The system includes a power supply IC that generates a first voltage different from the power supply voltage supplied to the first input pin, The power output connector further includes a second output pin connected to the control terminal of the switch, and a fourth output pin that outputs the first voltage. When the power input connector of the downstream circuit board is connected to the power output connector, the second output pin and the fourth output pin are short-circuited within the downstream circuit board, thereby supplying the first voltage to the control terminal of the switch and short-circuiting the switch. Circuit board.

[0049] (Note 2) A power input connector having a first input pin to which the power supply voltage is input, A power output connector having a first output pin, a second output pin, and a fourth output pin, A switch capable of short-circuiting and disconnecting the first input pin and the first output pin, The system comprises a power supply IC that generates a first voltage from the power supply voltage supplied to the first input pin, The second output pin is connected to the control terminal of the switch. The fourth output pin outputs the first voltage, 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, causing the switch to be short-circuited. Circuit board.

[0050] (Note 3) The aforementioned power input connector further has a second input pin and a fourth input pin. The device further includes a short-circuit circuit that short-circuits the second input pin and the fourth input pin. The circuit board described in Appendix 1 or Appendix 2.

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

[0052] (Note 5) A circuit board described in any one of the appendices 1 to 4, comprising two or more circuit boards including a first circuit board and a second circuit board, A first cable for supplying the power supply voltage to the power input connector of the first circuit board, A second cable connecting the power output connector of the first circuit board and the power input connector of the second circuit board is provided, Image sensor.

[0053] (Note 6) A frame on which two or more of the aforementioned circuit boards are mounted, The device further comprises a cover on which a power supply connector is provided, from which the power supply voltage is supplied from an external source, The power input connector and the power supply connector of the first circuit board are connected by the first cable. The image sensor described in Appendix 5.

[0054] (Note 7) One or more control boards for controlling the circuit board, The device further comprises a third cable that connects at least one of the circuit boards and the control board and supplies the first voltage to the control board. The image sensor described in Appendix 5 or Appendix 6.

[0055] (Note 8) A method for manufacturing an image sensor comprising two or more circuit boards described in any one of Appendix 1 to Appendix 4, A board fixing step involves fixing two or more circuit boards to a frame on which a sensor IC is fixed, along the arrangement direction of the sensor IC. A circuit board connection step of connecting two or more circuit boards with a second cable, A power supply connector connection step involves connecting a power supply connector provided on the cover and the power input connector on the first circuit board with a first cable, A method for manufacturing an image sensor having [the specified characteristic].

[0056] This disclosure allows for various embodiments and modifications without departing from the broad spirit and scope of this disclosure. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of this disclosure. In other words, the scope of this disclosure is indicated by the claims, not by the embodiments. Various modifications made within the scope of the claims and the equivalent significance of the disclosure are considered to be within the scope of this disclosure.

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

[0058] 1 Image sensor, 10, 10a~10h, 21, 22, 23, 40, 41 circuit 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 IC, 124 switch, 125, 126, 127 resistor, 128 first voltage output connector.

Claims

1. A contact image sensor comprising two or more circuit boards, including a first circuit board and a second circuit board; a frame on which the two or more circuit boards are mounted; and a cover provided with a power supply connector for which a power supply voltage is supplied from the outside, The first circuit board and the second circuit board are, A power input connector having a first input pin to which the power supply voltage is input, A power output connector having a first output pin that outputs the aforementioned power supply voltage, A switch capable of short-circuiting and disconnecting the first input pin and the first output pin, The system includes a power supply IC that generates a first voltage different from the power supply voltage supplied to the first input pin, The power input connector and the power supply connector of the first circuit board are connected by a first cable. The power output connector further includes a second output pin connected to the control terminal of the switch, and a fourth output pin that outputs the first voltage. When the power input connector of the second circuit board is connected to the power output connector of the first circuit board, the second output pin and the fourth output pin of the first circuit board are short-circuited within the second circuit board, thereby supplying the first voltage to the control terminal of the switch and short-circuiting the switch. Contact image sensor.

2. A contact image sensor comprising two or more circuit boards, including a first circuit board and a second circuit board; a frame on which the two or more circuit boards are mounted; and a cover provided with a power supply connector for which a power supply voltage is supplied from the outside, The first circuit board and the second circuit board are, A power input connector having a first input pin to which the power supply voltage is input, A power output connector having a first output pin, a second output pin, and a fourth output pin, A switch capable of short-circuiting and disconnecting the first input pin and the first output pin, The system comprises a power supply IC that generates a first voltage from the power supply voltage supplied to the first input pin, The second output pin is connected to the control terminal of the switch. The fourth output pin outputs the first voltage, The power input connector and the power supply connector of the first circuit board are connected by a first cable. When the power input connector of the second circuit board is connected to the power output connector of the first circuit board, the second output pin and the fourth output pin of the first circuit board are short-circuited within the second circuit board, thereby supplying the first voltage to the control terminal of the switch and short-circuiting the switch. Contact image sensor.

3. The aforementioned power input connector further has a second input pin and a fourth input pin. The second circuit board further includes a short-circuit circuit that short-circuits the second input pin and the fourth input pin. A contact image sensor according to claim 1 or claim 2.

4. The power input connector further has a third input pin to which the ground voltage of the power supply is supplied, The power output connector further has a third output pin to which the same ground voltage as the third input pin is output. A contact image sensor according to claim 1 or claim 2.

5. The present invention further comprises a second cable connecting the power output connector of the first circuit board and the power input connector of the second circuit board. A contact image sensor according to claim 1 or claim 2.

6. One or more control boards for controlling the circuit board, The device further comprises a third cable that connects at least one of the circuit boards and the control board and supplies the first voltage to the control board. A contact image sensor according to claim 1 or claim 2.

7. A method for manufacturing a contact image sensor according to claim 1 or claim 2, A board fixing step involves fixing two or more circuit boards to the frame on which the sensor IC is fixed, along the arrangement direction of the sensor IC. A circuit board connection step of connecting two or more circuit boards with a second cable, A power supply connector connection step involves connecting the power supply connector provided on the cover with the power input connector on the first circuit board using the first cable. A method for manufacturing a contact image sensor having

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