Circuit board and image reader

Abstract

To provide a circuit board which can easily discriminate a type of a mounted connector.SOLUTION: A circuit board (1) according to an embodiment of the present invention is the circuit board (1) in which one of a wide connector and a narrow connector is selectively mounted, and includes a wiring pattern (5) which connects an integrated circuit mounting part (2) to a narrow connector mounting part (4) via a wide connector mounting part (3). The wide connector mounting part (3) is arranged at a position closer to the integrated circuit mounting part (2) with respect to the narrow connector mounting part (4).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a circuit board and an image reading device on which a wide connector and a narrow connector can be selectively mounted. [Background technology]

[0002] Conventionally, there is known a circuit board that can selectively mount one of two types of connectors, a wide connector or a narrow connector, on one connector mounting portion. Regarding this type of circuit board, Patent Document 1 discloses a circuit board with connector fixing pads that can be used for both the wide connector and the narrow connector. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-041141 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional circuit boards described above, the wide connector and the narrow connector share a single connector mounting portion, meaning that the wide connector and the narrow connector are mounted in almost the same position, making it difficult to tell at a glance which connector is mounted on the circuit board.

[0005] An object of one aspect of the present invention is to provide a circuit board and an image reading device that make it easy to determine the type of connector mounted thereon. [Means for solving the problem]

[0006] (1) In order to solve the above-mentioned problems, the circuit board according to aspect 1 of the present invention is a circuit board on which one of a first connector and a second connector having fewer terminals than the first connector is selectively mounted, and is provided with an integrated circuit mounting portion capable of mounting an integrated circuit, a first connector mounting portion capable of mounting the first connector, a second connector mounting portion capable of mounting the second connector, and a wiring pattern that connects the integrated circuit mounting portion and the second connector mounting portion via the first connector mounting portion, and the first connector mounting portion is positioned closer to the integrated circuit mounting portion than the second connector mounting portion.

[0007] In the above configuration, the first connector mounting portion is positioned closer to the integrated circuit mounting portion than the second connector mounting portion, and the integrated circuit mounting portion is electrically connected to the first connector mounting portion and the second connector mounting portion by a wiring pattern that passes through the first connector mounting portion. Therefore, the first connector and the second connector can be mounted in different positions while sharing the same wiring pattern. Therefore, the above configuration makes it possible to realize a circuit board in which the type of connector mounted thereon can be easily identified.

[0008] (2) In a circuit board according to a second aspect of the present invention, in the first aspect, one of the first connector mounting portion and the second connector mounting portion may be an insertion mounting type, and the other may be a surface mounting type.

[0009] In the above configuration, the connector mounting methods are different between the first connector mounting portion and the second connector mounting portion. This physically prevents, for example, the second connector from being mistakenly mounted in the first connector mounting portion. Therefore, with this configuration, connector mounting errors can be reduced.

[0010] (3) In a circuit board according to a third aspect of the present invention, in the first or second aspect, the first connector mounting portion may be disposed between the integrated circuit mounting portion and the second connector mounting portion.

[0011] This configuration allows the integrated circuit mounting portion, the first connector mounting portion, and the second connector mounting portion to be arranged adjacent to each other in this order, thereby shortening the wiring pattern connecting these mounting portions and reducing noise generated by the wiring pattern.

[0012] (4) In a circuit board according to a fourth aspect of the present invention, in any one of the first to third aspects, at least one of the first connector and the second connector may be connectable to a flexible flat cable. According to the above configuration, it is possible to reduce the dimensions of the circuit board and the device on which the circuit board is mounted.

[0013] (5) In a circuit board according to aspect 5 of the present invention, in aspect 4, the first connector may be capable of connecting to a flexible flat cable having 16 conductors, and the second connector may be capable of connecting to a flexible flat cable having 14 conductors.

[0014] According to the above configuration, it is possible to easily determine which connector is mounted on the circuit board, the first connector that can be connected to a flexible flat cable having 16 conductors, or the second connector that can be connected to a flexible flat cable having 14 conductors, based on the mounting position.

[0015] (6) An image reading device according to aspect 6 of the present invention comprises a circuit board according to any one of aspects 1 to 5, an integrated circuit mounted on the integrated circuit mounting portion, and an image reading portion connected to the circuit board via a first connector mounted on the first connector mounting portion or a second connector mounted on the second connector mounting portion, and outputting a signal corresponding to the image of the read document to the circuit board.

[0016] In this configuration, one of the first connector and the second connector is mounted at a different mounting position on the circuit board depending on the specifications of the image reading unit installed in the image reading device. Therefore, this configuration makes it possible to share the circuit board between image reading units with different specifications, and to realize an image reading device in which the type of the mounted connector is easy to identify. [Effects of the Invention]

[0017] According to one aspect of the present invention, it is possible to provide a circuit board and an image reading device that make it easy to determine the type of connector mounted thereon. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a plan view schematically showing a circuit board according to a first embodiment of the present invention. [Figure 2] FIG. 4 is a plan view schematically showing a state in which a wide connector is mounted on the circuit board. [Figure 3] FIG. 4 is a plan view schematically showing a state in which a narrow connector is mounted on the circuit board. [Figure 4] FIG. 10 is a perspective view showing a multifunction peripheral including an image reading device according to a second embodiment of the present invention. [Figure 5] 1 is a block diagram showing the configuration of a control system of the image reading device, illustrating an example of a configuration in which a high-speed CIS is connected to a control board via a wide connector. [Figure 6] 1 is a block diagram showing the configuration of a control system of the image reading device, illustrating an example of a configuration in which a low-speed CIS is connected to a control board via a narrow connector. DETAILED DESCRIPTION OF THE INVENTION

[0019] [Embodiment 1] An embodiment of the present invention will now be described with reference to Figures 1 to 3. However, the following description is an example of a circuit board according to the present invention, and the technical scope of the present invention is not limited to the illustrated example.

[0020] [Circuit board configuration] Fig. 1 is a plan view schematically showing a circuit board 1 according to this embodiment. Fig. 2 is a plan view schematically showing a state in which a wide connector 7 is mounted on the circuit board 1, and Fig. 3 is a plan view schematically showing a state in which a narrow connector 8 is mounted on the circuit board 1.

[0021] 1 to 3, the circuit board 1 according to this embodiment is selectively mounted with either a wide connector 7 as a first connector or a narrow connector 8 as a second connector having fewer terminals than the wide connector 7. This allows the circuit board 1 to be used for both the wide connector 7 and the narrow connector 8.

[0022] The circuit board 1 is, for example, a multilayer printed circuit board. In this embodiment, the circuit board 1 has a rectangular shape in a plan view. In the following description, the longitudinal direction of the circuit board 1 is defined as the X-axis direction, and the lateral direction of the circuit board 1 that is perpendicular to the X-axis direction is defined as the Y-axis direction. However, the shape and dimensions of the circuit board 1 are not limited to the illustrated example, and can be changed as appropriate depending on the application of the circuit board 1, etc.

[0023] The circuit board 1 has, on its mounting surface, an integrated circuit mounting section 2 on which an integrated circuit (IC) can be mounted, a wide connector mounting section 3 on which a wide connector 7 can be mounted, and a narrow connector mounting section 4 on which a narrow connector 8 can be mounted. In addition, the circuit board 1 has a plurality of wiring patterns 5 formed thereon that electrically connect the integrated circuit mounting section 2 with the wide connector mounting section 3 and the narrow connector mounting section 4.

[0024] (Integrated Circuit Mounting Section) The integrated circuit mounting section 2 is an area where various integrated circuits 6 can be mounted. In the illustrated example, three integrated circuits 6, a first integrated circuit 61, a second integrated circuit 62, and a third integrated circuit 63, are mounted on the integrated circuit mounting section 2, lined up in the Y-axis direction. Note that the type and number of integrated circuits 6 mounted on the integrated circuit mounting section 2 are not particularly limited and can be selected appropriately depending on the application of the circuit board 1, etc.

[0025] For example, when the circuit board 1 is applied to a control board of an image reading device equipped with a CIS (Contact Image Sensor), the first integrated circuit 61 may be an LED driver, the second integrated circuit 62 may be an ASIC (Application-Specific Integrated Circuit), and the third integrated circuit 63 may be an AFE (Analog Front End), etc. The integrated circuit 6 is surface-mounted on the integrated circuit mounting section 2 by, for example, soldering the terminals 60 to the wiring pattern 5, etc.

[0026] (Wide connector mounting area) The wide connector mounting portion 3, which serves as a first connector mounting portion, is an area in which the wide connector 7 can be mounted. As shown in FIG. 2, the wide connector mounting portion 3 is an insertion-mount type mounting portion into which the wide connector 7 is inserted and is provided with lands 31 as connection electrodes corresponding to the number of terminals (not shown) of the insertion-mount type wide connector 7. The lands 31 are arranged on the back surface of the circuit board 1, opposite the mounting surface, via through holes 32 formed in the thickness direction of the circuit board 1. The wide connector 7 is mounted on the wide connector mounting portion 3 by inserting the terminals of the wide connector 7 into these through holes 32 and soldering them.

[0027] In this embodiment, a wide connector 7 having, for example, 16 terminals can be mounted on the wide connector mounting portion 3. Therefore, in the wide connector mounting portion 3, 16 lands 31 corresponding to the number of terminals of the wide connector 7 are arranged in two rows in a staggered pattern along the Y-axis direction.

[0028] The wide connector mounting portion 3 is disposed between the integrated circuit mounting portion 2 and the narrow connector mounting portion 4. This allows the integrated circuit mounting portion 2, the wide connector mounting portion 3, and the narrow connector mounting portion 4 to be disposed adjacent to one another in the X-axis direction in this order. This reduces the overall length of the wiring pattern 5 connecting these mounting portions. Therefore, when a wide connector 7 is mounted on the wide connector mounting portion 3 as shown in FIG. 2, noise such as signal waveform distortion caused by reflected waves from the end side of the wiring pattern 5, i.e., the pad 41 side, can be reduced. However, the positions of the integrated circuit mounting portion 2, the wide connector mounting portion 3, and the narrow connector mounting portion 4 are not limited to the illustrated example and can be changed as appropriate depending on the application of the circuit board 1, etc.

[0029] (Narrow connector mounting area) The narrow connector mounting portion 4 serving as the second connector mounting portion is an area where the narrow connector 8 can be mounted. As shown in Fig. 3, the narrow connector mounting portion 4 is a surface-mount type mounting portion on which the narrow connector 8 is surface-mounted, and is provided with pads 41 as connection electrodes corresponding to the number of terminals 80 of the surface-mount type narrow connector 8. The terminals 80 of the narrow connector 8 are soldered to the pads 41, whereby the narrow connector 8 is mounted on the narrow connector mounting portion 4.

[0030] In this embodiment, the narrow connector mounting portion 4 is capable of mounting a narrow connector 8 having, for example, 14 terminals 80. Therefore, the narrow connector mounting portion 4 has 14 pads 41 corresponding to the number of terminals 80, which are arranged in two staggered rows along the Y-axis direction.

[0031] In circuit board 1, wide connector mounting portion 3 is an insertion mounting type, while narrow connector mounting portion 4 is a surface mounting type, and the connector mounting methods are different between wide connector mounting portion 3 and narrow connector mounting portion 4. This physically prevents, for example, mistakenly mounting narrow connector 8 on wide connector mounting portion 3, thereby reducing connector mounting errors. Note that in order to reduce connector mounting errors, it is sufficient that the connector mounting methods are different between wide connector mounting portion 3 and narrow connector mounting portion 4. Therefore, wide connector mounting portion 3 may be a surface mounting type, and narrow connector mounting portion 4 may be an insertion mounting type.

[0032] (wiring pattern) The wiring pattern 5 is, for example, a copper foil pattern formed on the circuit board 1. The circuit board 1 is formed with linear wiring patterns 5 that extend linearly in one direction (the X-axis direction) and non-linear wiring patterns 5 that are partially bent or curved. These wiring patterns 5 electrically connect the integrated circuit mounting portion 2 to the wide connector mounting portion 3 and the narrow connector mounting portion 4. On the circuit board 1, the wiring pattern 5 connects the integrated circuit mounting portion 2 to the narrow connector mounting portion 4 via the wide connector mounting portion 3. In other words, the wiring pattern 5 extends from the integrated circuit mounting portion 2 and is connected to the pads 41 of the narrow connector mounting portion 4 via the through holes 32 connected to the lands 31 of the wide connector mounting portion 3.

[0033] In the illustrated example, ten wiring patterns 5 are formed on the circuit board 1. Each of the wiring patterns 5 extends from the integrated circuit mounting portion 2 and is connected to one of the pads 41 of the narrow connector mounting portion 4 via one of the through holes 32 connected to the land 31 of the wide connector mounting portion 3.

[0034] For example, when the circuit board 1 is used as a control board for an image reading device equipped with a CIS, the wiring pattern 5 transmits a clock signal, a start signal, an LED control signal for controlling an LED in the CIS, LED drive power, an image signal output from the CIS, and the like. In the figure, the lands 31 and pads 41 to which the wiring pattern 5 is not connected are, for example, lands 31 and pads 41 for power supply or ground. The wiring pattern 5 indicated by dashed lines indicates a pattern formed inside the multilayer circuit board 1, i.e., passing between layers. By forming a portion of the wiring pattern 5 inside the multilayer circuit board 1 in this way, short-circuiting between the wiring patterns 5 can be prevented.

[0035] 2 and 3, in the circuit board 1 having the above-described configuration, a flexible flat cable (FFC) 9, for example, is connected to the wide connector 7 or narrow connector 8 selectively mounted on the circuit board 1 as a harness that connects a device such as a CIS to the circuit board 1. By using the flexible flat cable 9 as the harness, the dimensions of the circuit board 1 and the device on which the circuit board 1 is mounted can be reduced.

[0036] Specifically, as shown in Fig. 2, the wide connector 7 can be connected to a wide flexible flat cable 91 having 16 conductors for high-speed signal transmission, and as shown in Fig. 3, the narrow connector 8 can be connected to a narrow flexible flat cable 92 having 14 conductors for low-speed signal transmission.

[0037] As described above, the wide connector 7, which can be connected to the wide flexible flat cable 91 having 16 conductors, and the narrow connector 8, which can be connected to the narrow flexible flat cable 92 having 14 conductors, are mounted in different positions on the circuit board 1. Therefore, as shown in Figures 2 and 3, it can be easily determined whether the wide connector 7 or the narrow connector 8 is mounted on the circuit board 1 based on the mounting positions of the connectors.

[0038] Additionally, on the circuit board 1, the wide connector mounting portion 3 is positioned closer to the integrated circuit mounting portion 2 than the narrow connector mounting portion 4. Positioning the wide connector mounting portion 3 closer to the integrated circuit mounting portion 2 in this manner can reduce degradation in signal quality between the integrated circuit 6, such as an AFE, mounted on the integrated circuit mounting portion 2 and the wide connector 7 mounted on the wide connector mounting portion 3. That is, as described above, a wide flexible flat cable 91 or the like for high-speed signal transmission capable of transmitting high-frequency signals can be connected to the wide connector 7 mountable on the wide connector mounting portion 3. High-frequency signals are more susceptible to signal reflection than low-frequency signals, so the signal quality is more likely to degrade as the length of the wiring pattern 5 through which they are transmitted increases. Therefore, by positioning the wide connector mounting portion 3 closer to the integrated circuit mounting portion 2 and minimizing the length of the wiring pattern 5 connecting these mounting portions, the effect of signal reflection between the integrated circuit 6 and the wide connector 7 can be reduced, thereby reducing degradation in signal quality.

[0039] [Circuit board effect] In this way, the circuit board 1 according to this embodiment is selectively mounted with either a wide connector 7 or a narrow connector 8 having fewer terminals than the wide connector 7. The circuit board 1 includes an integrated circuit mounting section 2 capable of mounting an integrated circuit 6, a wide connector mounting section 3 capable of mounting the wide connector 7, a narrow connector mounting section 4 capable of mounting the narrow connector 8, and a wiring pattern 5 that connects the integrated circuit mounting section 2 and the narrow connector mounting section 4 via the wide connector mounting section 3, and the wide connector mounting section 3 is positioned closer to the integrated circuit mounting section 2 than the narrow connector mounting section 4.

[0040] In the circuit board 1 according to this embodiment, the wide connector mounting portion 3 is positioned closer to the integrated circuit mounting portion 2 than the narrow connector mounting portion 4, and the integrated circuit mounting portion 2 is electrically connected to the wide connector mounting portion 3 and the narrow connector mounting portion 4 by a wiring pattern 5 that passes through the wide connector mounting portion 3. As a result, the wide connector 7 and the narrow connector 8 can be mounted in different positions while sharing the wiring pattern 5. Therefore, according to this embodiment, it is possible to realize a circuit board 1 in which it is easier to identify the type of connector mounted thereon, compared to a conventional configuration in which the connector mounting portion is shared.

[0041] Furthermore, since the mounting positions of the wide connector 7 and the narrow connector 8 are different on the circuit board 1, the arrangement positions of the lands 31 in the wide connector mounting portion 3 and the arrangement positions of the pads 41 in the narrow connector mounting portion 4 can be set individually. Therefore, for example, by bending or curving the wiring pattern 5 between the lands 31 and the pads 41, it becomes easy to design the arrangement positions of the lands 31 and the pads 41 to be different according to the terminal positions of the wide connector 7 and the narrow connector 8 to be used.

[0042] There is no particular limitation on the number of lands 31 arranged on the wide connector mounting portion 3 and the number of pads 41 arranged on the narrow connector mounting portion 4. The number of these connection electrodes can be changed as appropriate depending on the number of terminals of the wide connector 7 and the narrow connector 8, i.e., the number of conductors of the wide flexible flat cable 91 and the narrow flexible flat cable 92.

[0043] Furthermore, there are no particular limitations on the type of harness connected to the wide connector 7 and the narrow connector. A cable other than the flexible flat cable 9 may be used as the harness. However, from the viewpoint of miniaturizing the dimensions of the circuit board 1 and the device on which the circuit board 1 is mounted, it is preferable to use the flexible flat cable 9.

[0044] [Embodiment 2] Another embodiment of the present invention will be described below with reference to FIGS. 4 to 6. In this embodiment, a configuration example in which a circuit board according to the present invention is applied to a control board of an image reading device will be described. However, the following description is one example of an image reading device according to the present invention, and the technical scope of the present invention is not limited to the illustrated example. For convenience of explanation, components having the same functions as those described in the above embodiment will be denoted by the same reference numerals, and their description will not be repeated.

[0045] [Multifunction device configuration] Fig. 4 is a perspective view showing a multifunction peripheral 100 equipped with an image reading device 110 according to this embodiment. As shown in Fig. 4, the multifunction peripheral 100 has an openable and closable document cover 130 on the top surface of a base 120. A glass document table 121 on which a document (not shown) is placed is provided on the top end surface of the base 120. The document cover 130 is attached to an edge on one side of the top end surface of the base 120 via a hinge 123 so as to be openable and closable, so as to cover the document placed on the document table 121 by closing it on the surface of the document table 121.

[0046] Moreover, this document cover 130 is configured as a document cover equipped with an ADF (Auto Document Feeder), and has the function of transporting documents placed on a paper feed tray 131 to a paper discharge tray 132 along a transport path.

[0047] The multifunction device 100 is also equipped with an image reading device 110 that includes a CIS 230 that can read images of documents transported along a transport path. The CIS 230 is provided on a document table 121 that corresponds to a reading position on the transport path, and is movable below the document table 121 in the sub-scanning direction (left and right direction in the drawing).

[0048] The CIS 230 is connected to a control board 450 provided inside the base 120 via a flexible flat cable 9. The flexible flat cable 9 has a length that allows the CIS 230 to move below the platen 121 over the entire range in the sub-scanning direction.

[0049] Furthermore, inside the base 120, an image forming section 800 is provided that forms an image on a sheet of paper as an example of a recording medium by electrophotography.

[0050] (Configuration of the control system of the image reading device) 5 and 6 are block diagrams showing the configuration of the control system of the image reading device 110. Fig. 5 shows an example of a configuration in which a high-speed CIS 231 is connected to a control board 450 as the CIS 230, and Fig. 6 shows an example of a configuration in which a low-speed CIS 232 is connected to the control board 450 as the CIS 230.

[0051] 5, the high-speed CIS 231 is composed of a high-speed image reading unit 233 capable of reading images at high speed and high resolution, an LED 234 that irradiates the document with light, and a wide connector 235 to which a wide flexible flat cable 91 can be connected. The high-speed image reading unit 233 is equipped with a lens that guides light reflected from the document to a line sensor, and a line sensor in which light-receiving elements are arranged in the main scanning direction and that photoelectrically converts the light reflected from the document to generate an analog signal AO corresponding to one line of an image in the main scanning direction (front-to-back direction). In the document reading operation of the high-speed CIS 231, the LED 234 irradiates light onto the document, and the high-speed image reading unit 233 photoelectrically converts the light reflected from the document surface using the line sensor, and outputs the analog signal AO as an image signal.

[0052] The control board 450 is configured by mounting various electronic components on a circuit board 11. Specifically, an LED driver 64 that controls the on / off of the LED 234, an AFE 65 that converts an analog signal AO into a digital signal, and an ASIC 66 that performs various processes are mounted on the integrated circuit mounting section 2. A wide connector 7 that inputs and outputs various signals to and from the high-speed CIS 231 via a wide flexible flat cable 91 is mounted on the wide connector mounting section 3. On the circuit board 11, the wide connector mounting section 3 and the narrow connector mounting section 4 are arranged along the Y-axis direction.

[0053] The AFE 65 includes a sample-and-hold circuit (S / H) 621 that samples an analog signal AO in accordance with a sample-and-hold signal SH, and an A / D conversion circuit 622 that converts the analog signal AO sampled by the sample-and-hold circuit (S / H) 621 into a digital signal.

[0054] The ASIC 66 includes a timing generation circuit 661 that outputs a sample and hold signal SH to the sample and hold circuit 651, and also outputs a clock signal CLK, a start signal SP, and a timing signal for generating an LED control signal that operates the LED driver 64. In addition to the timing generation circuit 661, the ASIC 66 also includes a CPU 662, a ROM 663, a RAM 664, an NVRAM 665, and an image processing unit 666.

[0055] When connecting the high-speed CIS 231 to the control board 450, for example, a wide flexible flat cable 91 for high-speed signal transmission having 16 conductors is used. For this reason, as described above, in the control board 450, the wide connector 7 is selectively mounted on the wide connector mounting portion 3 of the circuit board 11. By attaching the wide flexible flat cable 91 to this wide connector 7 and connecting the control board 450 and the high-speed CIS 231, signal transmission between the high-speed CIS 231 and the control board 450 becomes possible.

[0056] 6, the low-speed CIS 232 has a configuration having a lens array and a line sensor similar to those of the high-speed image reading unit 233, and is composed of a low-speed image reading unit 236 that reads images at a relatively slower speed and lower resolution than the high-speed image reading unit 233, an LED 234 that irradiates the document with light, and a narrow connector 237 to which the narrow flexible flat cable 92 can be connected. Like the high-speed image reading unit 233, the low-speed image reading unit 236 includes a line sensor, a lens that forms an optical path, etc.

[0057] When connecting the low-speed CIS 232 to the control board 450, a narrow flexible flat cable 92 for low-speed signal transmission, having, for example, 14 conductors, is used. For this reason, in the control board 450, a narrow connector 8 is selectively mounted on the narrow connector mounting portion 4 of the circuit board 11. By attaching the narrow flexible flat cable 92 to this narrow connector 8 and connecting the control board 450 and the low-speed CIS 232, signal transmission between the low-speed CIS 232 and the control board 450 becomes possible.

[0058] In this way, in the image reading device 110, either the wide connector 7 or the narrow connector 8 is selectively mounted on the circuit board 11 depending on the specifications of the CIS 230. This allows the circuit board 11 to be shared between the high-speed CIS 231 and the low-speed CIS 232, which have different specifications.

[0059] [Image reader control] Next, a description will be given of the control of the image reading device 110. Note that the control in the configuration shown in Fig. 5 in which the high-speed CIS 231 is connected to the control board 450 and the control in the configuration shown in Fig. 6 in which the low-speed CIS 232 is connected to the control board 450 are basically the same. Therefore, hereinafter, a control example of the image reading device 110 will be described based on Fig. 5.

[0060] When a start signal SP is input from the control board 450, the high-speed image reading unit 233 of the high-speed CIS 231 outputs an analog signal AO corresponding to one line of an image in the main scanning direction (front-back direction) one pixel at a time in synchronization with the clock signal CLK. At this time, the LED 234 is controlled to be turned on and off by an LED control signal input from the control board 450.

[0061] The start signal SP and the clock signal CLK are transmitted from the timing generation circuit 631 of the control board 450 via the wide flexible flat cable 91 and input to the high-speed image reading unit 233 via the wide connector 235 provided on the outer circumferential surface of the high-speed CIS 231. In addition, the LED control signal is transmitted from the LED driver 64 of the control board 450 via the wide flexible flat cable 91 and input to the LED 234 via the wide connector 235.

[0062] Next, the analog signal AO output from the high-speed CIS 231 is input to the AFE 65 via the wide flexible flat cable 91 and converted into a digital signal in the A / D conversion circuit 652. The digital signal output from the A / D conversion circuit 652 is transmitted to a bus line 667 which connects the timing generation circuit 661, CPU 662, ROM 663, RAM 664, NVRAM 665, and image processing unit 666. Therefore, the ASIC 66 can execute processes such as expanding the image read via the high-speed CIS 231 into a line buffer set inside the RAM 664 and outputting a drive signal to the image forming unit 800 via the image processing unit 666.

[0063] [Effects of image reading devices] As described above, the image reading device 110 according to this embodiment includes a circuit board 11, an LED driver 64, an AFE 65, and an ASIC 66 mounted on the integrated circuit mounting section 2, and a high-speed image reading section 233 or a low-speed image reading section 236 that is connected to the circuit board 11 via a wide connector 7 mounted on the wide connector mounting section 3 or a narrow connector 8 mounted on the narrow connector mounting section 4, and outputs an analog signal AO corresponding to the image of the read document.

[0064] In the image reading device 110, either the wide connector 7 or the narrow connector 8 is mounted at a different mounting position on the circuit board 11 depending on the specifications of the high-speed image reading unit 233 or the low-speed image reading unit 236 mounted in the image reading device 110.

[0065] Therefore, according to this embodiment, the circuit board 11 can be shared between image reading units with different specifications, and an image reading device 110 can be realized in which the type of the mounted connector can be easily identified.

[0066] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0067] 1,11 Circuit board 2 Integrated circuit assembly section 3 Wide connector mounting area (first connector mounting area) 4 Narrow connector mounting area (second connector mounting area) 5 Wiring pattern 6. Integrated Circuits 7 Wide connector (first connector) 8 Narrow Connector (Second Connector) 9 Flexible Flat Cable 61 First Integrated Circuit (Integrated Circuit) 62 Second Integrated Circuit (Integrated Circuit) 63 Third Integrated Circuit (Integrated Circuit) 64 LED Driver (Integrated Circuit) 65 AFE (Integrated Circuit) 66 ASIC (Integrated Circuit) 80 terminals 91 Wide flexible flat cable (flexible flat cable) 92 Narrow flexible flat cable (flexible flat cable) 110 Image reader 233 High-speed image reading unit (image reading unit) 236 Low-speed image reading unit (image reading unit) AO Analog signal (signal) CLK Clock signal (signal) SP Start signal (signal) SH Sample and hold (signal)

Claims

1. A circuit board on which one of a first connector and a second connector having fewer terminals than the first connector is selectively mounted, an integrated circuit mounting section capable of mounting an integrated circuit; a first connector mounting portion capable of mounting the first connector; a second connector mounting portion to which the second connector can be mounted; a wiring pattern that connects the integrated circuit mounting portion and the second connector mounting portion via the first connector mounting portion, the first connector mounting portion is disposed closer to the integrated circuit mounting portion than the second connector mounting portion, One of the first connector mounting portion and the second connector mounting portion is an insertion mounting type, and the other is a surface mounting type.

2. The circuit board according to claim 1 , wherein the first connector mounting portion is disposed between the integrated circuit mounting portion and the second connector mounting portion.

3. 3. The circuit board according to claim 1, wherein at least one of the first connector and the second connector is connectable to a flexible flat cable.

4. the first connector is connectable to the flexible flat cable having 16 conductors; 4. The circuit board according to claim 3, wherein the second connector is connectable to the flexible flat cable having 14 conductors.

5. The circuit board according to any one of claims 1 to 4; an integrated circuit mounted on the integrated circuit mounting section; an image reading unit connected to the circuit board via a first connector mounted on the first connector mounting portion or a second connector mounted on the second connector mounting portion, and configured to output a signal corresponding to an image of a read document to the circuit board; An image reading device comprising:

Images