Printed circuit board

Abstract

When mounting an electrode-equipped button battery and a socket for the button battery exclusively on a printed circuit board, it is not possible to avoid overlapping the mounting pattern of one component with the pattern restriction area of ​​the other, and to reduce the area required for mounting. [Solution] When mounting an electrode-equipped button battery and a socket for the button battery exclusively on a printed circuit board, the mounting pattern of the other does not overlap with the pattern restriction area of ​​one, and at least a portion of the outer shape areas of the two overlap on the printed circuit board.

Description

Technical Field

[0001] The present invention relates to a printed circuit board.

Background Art

[0002] Conventionally, there has been proposed a technique related to a component mounting land on a printed circuit board that allows electronic components with different arrangements of component mounting lands for mounting electronic components on the printed circuit board that serve as solder connection parts to be mounted exclusively at the same location, although they are electrically compatible.

[0003] That technique arranges a component mounting land for an electronic component with a small inter-terminal width inside the component mounting land for an electronic component with a large inter-terminal width, and minimizes the area occupied by the electronic components to be mounted exclusively on the substrate (Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The controller unit mounted on the image forming apparatus has a clock unit. And in order to correctly indicate the time even when the power of the image forming apparatus is off, the clock unit is powered by a button battery. Power supply by the button battery is performed by mounting a button battery with an electrode on the printed circuit board, or by mounting a button battery socket on the printed circuit board and mounting the button battery in the button battery socket.

[0006] By the way, in order to switch between the case of mounting a button battery with an electrode on the same printed circuit board to supply power to the clock unit and the case of mounting the button battery in the button battery socket to supply power to the clock unit, it is necessary to devise the arrangement of the component mounting radon.

[0007] When providing mounting pads for electrode-equipped button batteries and button battery sockets on a printed circuit board, it is necessary to provide a pattern-restricted area on the underside of these components. The pattern-restricted area is a restricted area where the placement of component mounting pads, signal wiring patterns, signal wiring pattern vias, power supply patterns, GND patterns, and vias is prohibited.

[0008] When mounting a button battery with electrodes and a socket for the button battery exclusively on a printed circuit board, it is desirable to arrange the mounting pads for these components so that the area occupied by each component on the printed circuit board is as small as possible, and so that they are outside the pattern-restricted area.

[0009] Therefore, the present invention aims to provide a component mounting land arrangement that can save space by arranging two types of components, an electrode-equipped button battery and a socket for the button battery, which are mounted exclusively together. [Means for solving the problem]

[0010] In a printed circuit board capable of mounting a socket for a first button battery or a second button battery, The first button battery has a first electrode, a first pattern-prohibited area, and a first outer shape area. The socket has a second electrode, a second pattern prohibition area, and a second outer shape area. The printed circuit board has a first mounting land for mounting the first electrode and a second mounting land for mounting the second electrode. The first mounting land is located in a region of the printed circuit board that is different from the second pattern prohibition area, and the second mounting land is located in a region of the printed circuit board that is different from the first pattern prohibition area. The first mounting land and the second mounting land are arranged on the printed circuit board such that at least a portion of the first outer region and the second outer region overlap on the printed circuit board. It is characterized by the following: [Effects of the Invention]

[0011] According to the present invention, when an electrode-equipped button battery and a socket for the button battery are mounted exclusively on a printed circuit board, the mounting pattern of the other does not overlap with the pattern restriction area of ​​the other, and the area required for mounting can be reduced. [Brief explanation of the drawing]

[0012] [Figure 1] This is a block diagram showing the configuration of the image forming apparatus 100. [Figure 2] (A) A top view of a surface-mount type button battery with electrodes. (B) A side view of a surface-mount type button battery with electrodes. (C) A top view of a socket for a surface-mount type button battery. (D) A side view of a socket for a surface-mount type button battery. [Figure 3] This diagram shows the arrangement of the component mounting pads for a surface-mount type button battery with electrodes and a button battery socket. [Figure 4] This diagram shows the arrangement of the component mounting pads for a surface-mount type button battery with electrodes and a button battery socket. [Figure 5] This diagram shows the arrangement of the openings for a DIP-type button battery with electrodes and the component mounting pads for a surface-mount type button battery socket. [Figure 6] This diagram shows the arrangement of component mounting pads for surface-mount type button batteries with electrodes and the component mounting openings for DIP type button battery sockets. [Figure 7](A) It is a diagram showing the arrangement of component mounting lands when a surface-mounted button battery with electrodes is arranged on the back surface of a printed circuit board. (B) It is a diagram showing the arrangement of component mounting lands when a socket for a surface-mounted button battery is arranged on the surface of a printed circuit board. [Figure 8] (A) It is a diagram showing the arrangement of lands for a button battery with electrodes and lands for a connector on the printed circuit board of the controller unit 110. (B) It is a diagram showing the arrangement of component mounting lands for a socket for a button battery and a connector on a sub-board on which the socket for a button battery is mounted.

Embodiments for Carrying Out the Invention

[0013] Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. Note that the present invention will be described by taking as an example the printed circuit board constituting the controller unit 110 of the image forming apparatus 100, but it is not limited to the printed circuit board constituting the controller unit 110.

[0014] FIG. 1 is a block diagram showing the configuration of an image forming apparatus 100 to which the printed circuit board of the present invention is applied and on which the controller unit 110 is mounted.

[0015] The image forming apparatus 100 includes a controller unit 110, an HDD 123, an operation unit 120, a scanner unit 121, and a print unit 122. The controller unit 110 includes a control unit 111, a RAM 112, a ROM 113, an image processing unit 116, an HDD IF control unit 114, a network IF unit 115, a battery 160, and a clock unit 165, and controls overall control of the image forming apparatus 100.

[0016] The control unit 111 controls the image forming apparatus 100 according to a program stored in the ROM 112. Further, the control unit 111 controls the clock unit 165. The network IF unit 115 is an interface for connecting the image forming apparatus 100 to a LAN. The network IF unit 115 is connected to the control unit 111 via a bus 118.

[0017] The RAM 113 is a work memory when the control unit 111 performs processing according to the ROM 112. The image processing unit 116 performs image processing on the image data captured from the scanner unit 121.

[0018] The HDD IF control unit 114 is a bridge circuit for converting the bus 118 to the bus 117. The RAM 113, ROM 112, image processing unit 116, and HDD IF control unit 114 are connected to the control unit 111 via the bus 118. The HDD 123 is a non-volatile storage device for storing data.

[0019] Note that as the storage device, a storage device other than the HDD (for example, SSD, etc.) may be used. The scanner unit 121 reads a document and inputs image data. The print unit 122 prints the image data processed by the image processing unit 116 of the controller unit 110 on the image data input from the scanner unit 121.

[0020] The operation unit 120 provides various information to the user via the display, and inputs various instructions from the user to the image forming apparatus 100 via buttons or the like. The operation unit 120, scanner unit 121, and print unit 122 are connected to the controller unit 110 via the bus 118. The HDD 123 is connected to the controller unit 110 via the bus 117.

[0021] The clock unit 165 has a clock function for managing the date and time. The clock unit 165 is connected to the control unit 111 via the bus 166. The battery 160 supplies power to the clock unit 165 so that the clock unit 165 can perform an operation of correctly marking the date and time even when the image forming apparatus 100 is not supplied with power.

[0022] The battery 160 is an electrode-attached button battery or a button battery attached to a button battery socket. The clock unit 165 provides a clock value for attaching a time stamp to a file stored in the HDD 123 of the image forming apparatus 100.

[0023] Furthermore, one example of an application specific to the image forming apparatus 100 is a control switching application that switches the initial control of the print unit 122 when the main power switch (not shown) of the next image forming apparatus 100 is turned on, based on the off-time interval of the image forming apparatus 100.

[0024] Figure 2(A) is a top view of the battery 160 in the present invention when it is a surface-mount type button cell with electrodes. Figure 2(B) is a side view of the surface-mount type button cell with electrodes.

[0025] The button battery section 200 (first button battery) is the battery body of the button battery with electrodes. Electrode 210 is the positive electrode attached to the button battery section 200. Electrode 220 is the negative electrode attached to the button battery section 200. The pattern restriction area (320) of the button battery with electrodes is the lower surface area of ​​the button battery section 200.

[0026] The pattern prohibition area (320) is the first pattern prohibition area. The electrode on the underside of the button battery section 200 is the positive electrode and there is no insulating material. The wiring pattern on the printed circuit board is covered with resist, but there is a possibility that the resist may be peeled off when the button battery with electrodes is placed on the printed circuit board.

[0027] In addition, there are cases where the vias are not covered with resist. In this case, if there are wiring patterns or vias on the underside of the button battery section 200, there is a risk of short-circuiting (contact) between the underside electrodes of the button battery section 200 and the wiring patterns or vias. For this reason, the pattern prohibition area (dotted circle 320) of the electrode-equipped button battery prohibits the provision of signal wiring patterns, vias of signal wiring patterns, GND patterns, and vias of GND patterns (restriction).

[0028] The external area of ​​the button battery with electrodes (first external area) is the area occupied by the button battery section 200, electrodes 210 and 220. This external area is necessary when mounting the button battery with electrodes onto a printed circuit board.

[0029] Figure 2(C) is a top view of the battery 160 when it is in a surface-mount type button battery socket. Figure 2(D) is a side view of the surface-mount type button battery socket.

[0030] Mold 230 is the part where a button battery (second button battery), not shown, is installed. Mold 231 is a mold that secures the electrodes 250 of the button battery socket. Mold 232 is a mold that secures the electrodes 240 of the button battery socket.

[0031] Electrode 240 is an electrode in the button battery socket. When a button battery (not shown) is installed in the button battery socket, electrode 240 becomes the positive terminal. Electrode 250 is an electrode in the button battery socket.

[0032] When a button battery (not shown) is installed in the button battery socket, electrode 250 becomes the negative terminal. The pattern prohibition areas of the button battery socket are the part of mold 231 where electrode 250 is absent, the part of mold 232 where electrode 240 is absent, and the bottom surface of mold 230. The pattern prohibition area (dashed line 350) is a second pattern prohibition area.

[0033] The pattern restriction area for button battery sockets is the area where it is prohibited to create component mounting pads that extend to the bottom surface of the button battery socket (socket constraint).

[0034] Furthermore, the pattern restriction area of ​​the button battery socket is an area where the placement of signal wiring patterns (pattern vias) and GND patterns (pattern vias) is prohibited (socket constraint). The pattern restriction area of ​​the button battery socket is an area where the placement of signal wiring patterns and GND patterns is not prohibited (socket constraint).

[0035] The external area of ​​the button battery socket (second external area) is the area occupied by molds 230, 231, 232, electrode 240, and electrode 250. This external area is necessary when mounting the button battery socket on the printed circuit board.

[0036] Furthermore, if the copper foil is exposed only on the back side of the socket placement surface for the button battery, it is not prohibited to place the through-holes of a lead component (not shown) that is mounted simultaneously with the electrode-equipped button battery in the pattern-restricted area of ​​the button battery socket.

[0037] Furthermore, if the copper foil is exposed only on the back side of the surface where the button battery socket is located, it is not prohibited to place through-holes for attaching spacers (not shown) that secure the circuit board in the pattern-restricted area of ​​the button battery socket.

[0038] In addition, if the copper foil is exposed only on the back side of the electrode-equipped button battery placement surface, it is not prohibited to place the through-holes of an unillustrated lead component, which is mounted simultaneously when mounting the button battery socket, in the pattern-restricted area of ​​the electrode-equipped button battery.

[0039] Furthermore, if the copper foil is exposed only on the back side of the surface where the electrode-equipped button battery is placed, it is not prohibited to place through-holes for attaching spacers (not shown) that secure the substrate in the pattern-restricted area of ​​the electrode-equipped button battery.

[0040] Figure 3 shows the arrangement of the component mounting pads for a surface-mount type button battery with electrodes and a socket for the button battery.

[0041] Figure 3 shows an example in which an electrode-equipped button battery and a button battery socket are arranged orthogonally so that their outer regions overlap (at least partially overlap). The shaded area 300 is the component mounting land (first mounting land) on the positive terminal side of the surface-mount type electrode-equipped button battery. The shaded area 310 is the component mounting land (first mounting land) on the negative terminal side of the surface-mount type electrode-equipped button battery.

[0042] The dotted circle 320 indicates the pattern prohibition area for a surface-mount type button battery with electrodes. The dotted circle 320 is also the outer shape area of ​​the surface-mount type button battery with electrodes. The shaded area 330 is the component mounting land (second mounting land) on the positive electrode side of the socket for the surface-mount type button battery.

[0043] The shaded area 340 is the negative terminal component mounting land (second mounting land) of the surface-mount type button battery socket. The dashed area 350 shows the outer shape of the button battery socket.

[0044] In Figure 3, the component mounting lands for the surface-mount type button battery with electrodes (shaded areas 300 and 310) and the component mounting lands for the button battery socket (shaded areas 330 and 340) are arranged perpendicularly to each other. The component mounting lands for the button battery with electrodes are larger than the dimensions of electrodes 240 and 250, as well as molds 231 and 232 of the button battery socket.

[0045] Therefore, if the component mounting land for the electrode-equipped button battery and the component mounting land for the button battery socket are shared by a single land, the shared land will occupy at least up to the bottom of the molds 231 and 232 of the button battery socket.

[0046] If the button battery socket is soldered in that state, the solder will flow through the common land to the land end on the mold 230 side. When the solder flows through the common land to the land end on the mold 230 side, the solder will cause molds 231 and 232 to lift, which may result in improper mounting of electrodes 240 and 250.

[0047] Therefore, in this embodiment, the arrangement is as shown in Figure 3. However, considering the mounting, it is not necessary to position the component mounting lands of the button battery with electrodes (shaded areas 300 and 310) and the component mounting lands of the button battery socket (shaded areas 330 and 340) perpendicular to each other. In addition, if the button battery socket is smaller than the outer dimensions of the button battery with electrodes, the center positions of the button battery with electrodes and the center positions of the button battery socket may be offset.

[0048] In that case, the component mounting lands (shaded areas 330, 340) of the button battery socket are positioned so that the component mounting lands (shaded areas 300, 310) of the button battery with electrodes do not enter the outer area (dashed area 350) of the button battery socket.

[0049] As shown in Figure 3, when providing component mounting pads for both the electrode-equipped button battery and the button battery socket on a printed circuit board, the area occupied by both components on the printed circuit board can be reduced.

[0050] Figure 4 shows the arrangement of the component mounting pads for a surface-mount type button battery with electrodes and a button battery socket.

[0051] Figure 4 shows an example of arranging a button battery with electrodes and a button battery socket side by side so that their external areas overlap (at least partially overlap).

[0052] The shaded area 400 is the component mounting land on the positive terminal side of the surface-mount type button battery with electrodes. The shaded area 410 is the component mounting land on the negative terminal side of the surface-mount type button battery with electrodes. The dotted circle 420 indicates the pattern prohibition area of ​​the surface-mount type button battery with electrodes. The dotted circle 420 is also the outer shape area of ​​the surface-mount type button battery with electrodes.

[0053] The shaded area 430 is the component mounting pad on the positive terminal side of the surface-mount type button battery socket. The shaded area 440 is the component mounting pad on the negative terminal side of the surface-mount type button battery socket.

[0054] The dashed line 450 indicates the outer area of ​​the button battery socket. As shown in Figure 4, when the component mounting lands for the electrode-equipped button battery and the component mounting lands for the button battery socket are provided on the printed circuit board, the area occupied by both components on the printed circuit board can be reduced.

[0055] Button batteries with electrodes and button battery sockets are also available as DIP type components. Below, we will explain examples of component mounting pad arrangements for button batteries with electrodes and button battery sockets when using both DIP and surface mount types.

[0056] Figure 5 shows the arrangement of the openings for a DIP-type button battery with electrodes and the component mounting pads for a surface-mount type button battery socket.

[0057] The shaded circle 500 is an opening for mounting components on the positive terminal side of a DIP-type button battery with electrodes.

[0058] The shaded circle 510 is an opening for component mounting on the negative terminal side of a DIP-type button battery with electrodes. The shaded circle 500 and the shaded circle 510 are formed as through-holes that penetrate both the front and back sides of the printed circuit board, and the component mounting lands are formed on the side opposite to the component placement side.

[0059] The dotted rectangle 520 represents the outer shape area of ​​a DIP-type button battery with electrodes. The shaded area 530 represents the component mounting land on the positive terminal side of a surface-mount type button battery socket.

[0060] The shaded area 540 is the component mounting pad on the negative terminal side of a surface-mount type button battery socket.

[0061] The dashed line 550 indicates the outer area of ​​the button battery socket. The arrangement described in Figure 5 (with at least some overlap) allows for space savings when providing component mounting lands for both the button battery with electrodes and the button battery socket on a printed circuit board.

[0062] Figure 6 shows the arrangement of component mounting pads for a surface-mount type button battery with electrodes and the component mounting openings for a DIP type button battery socket. The shaded area 600 is the component mounting pad on the positive electrode side of the surface-mount type button battery with electrodes.

[0063] The shaded area 610 is the component mounting land on the negative terminal side of a surface-mount type button battery with electrodes. The dotted circle 620 indicates the pattern prohibition area of ​​the surface-mount type button battery with electrodes. The dotted circle 620 is also the outer shape area of ​​the surface-mount type button battery with electrodes.

[0064] The shaded circles 630 and 635 are openings for mounting components on the positive terminal side of the DIP type button battery socket. The shaded circle 640 is an opening for mounting components on the negative terminal side of the DIP type button battery socket.

[0065] The shaded circles 630, 635, and 640 are formed by through-holes that penetrate both the front and back surfaces of the printed circuit board, and the component mounting lands are formed on the surface opposite to the component placement surface. The dashed rectangle 650 indicates the outer shape area of ​​the button battery socket.

[0066] As shown in Figure 6 (with at least some overlap), when providing component mounting pads for both the button battery with electrodes and the button battery socket on a printed circuit board, the area occupied by both components on the printed circuit board can be reduced.

[0067] It is also conceivable that surface-mount type button batteries with electrodes, as well as sockets for button batteries, may be placed on both the front and back of the printed circuit board. An example of such a placement is described below.

[0068] Figures 7(A) and 7(B) show a case where a surface-mount type button battery with electrodes is placed on the back of a printed circuit board, and a surface-mount type button battery socket is placed on the front of the printed circuit board, with the outer dimensions of each component visible through each surface.

[0069] Figures 7(A) and 7(B) show examples where a button battery with electrodes and a socket for the button battery are placed on the front and back of a printed circuit board.

[0070] As shown in Figure 7(A), the pattern restriction area 720, which has the same shape as the outer area of ​​a surface-mount type button battery with electrodes, overlaps (at least partially overlaps) with the shape 755 which is the projection of the dashed line area 750, which is the outer area of ​​the button battery socket located on the back side.

[0071] As shown in Figure 7(B), the dashed line portion 750, which is the outer shape of the button battery socket, overlaps (or at least partially overlaps) with the shape 725, which is the projection of the pattern restriction area 720 of the electrode-equipped button battery placed on the surface.

[0072] The shaded area 700 is the component mounting land on the positive terminal side of the surface-mount type button battery with electrodes. The shaded area 710 is the component mounting land on the negative terminal side of the surface-mount type button battery with electrodes.

[0073] The dotted circle 720 indicates the pattern prohibition area for a surface-mount type button battery with electrodes. The dotted circle 720 is also the outer shape area of ​​the surface-mount type button battery with electrodes. The hatched area 730 is the component mounting land on the positive electrode side of the socket for the surface-mount type button battery.

[0074] The shaded area 740 is the component mounting land on the negative terminal side of the surface-mount type button battery socket. The dashed area 750 shows the outer shape of the button battery socket.

[0075] It is also conceivable that the button battery with electrodes and the socket for the button battery may be mounted on separate printed circuit boards. An example of this case is explained below.

[0076] Figures 8(A) and 8(B) show the case where an electrode-equipped button battery and a socket for the button battery are mounted on separate printed circuit boards. Figure 8(A) shows the arrangement of component mounting pads and connectors for the electrode-equipped button battery on the printed circuit board of the controller unit 110.

[0077] Figure 8(B) shows the arrangement of component mounting pads and connectors for the button battery socket on the sub-board on which the button battery socket is mounted.

[0078] The shaded area 800 is the component mounting land on the positive terminal side of the surface-mount type button battery with electrodes. The shaded area 810 is the component mounting land on the negative terminal side of the surface-mount type button battery with electrodes.

[0079] The dotted circle 820 indicates the pattern prohibition area for surface-mount type button batteries with electrodes.

[0080] The dotted circle 820 also represents the outer dimensions of a surface-mount type button battery with electrodes.

[0081] The dotted square 860 is a connector. Circles 861 and 862 are through-holes through which the terminals of the connector (dotted square 860) pass. Circle 861 connects to the shaded area 800, which is the component mounting land on the positive terminal side of the button battery with electrodes. Circle 862 connects to the ground plane, which is at the same potential as the shaded area 810, which is the component mounting land on the negative terminal side of the button battery with electrodes.

[0082] The button battery socket mounting board 880 is a sub-board for providing the battery 160 of the image forming apparatus 100 via a button battery socket board. The shaded area 830 is the component mounting land on the positive terminal side of the surface-mount type button battery socket.

[0083] The shaded area 840 is the component mounting land on the negative terminal side of the surface-mount type button battery socket. The dashed area 850 shows the outer shape of the button battery socket. The dotted rectangle 870 is the connector.

[0084] Circles 871 and 872 are through-holes through which the terminals of the connector (dotted square area 870) pass. Circle 871 connects to the shaded area 830, which is the component mounting land on the positive side of the button battery socket. Circle 872 connects to the ground plane, which is at the same potential as the shaded area 840, which is the component mounting land on the negative side of the button battery socket.

[0085] When mounting a button battery with electrodes on the printed circuit board of the controller unit 110, the connector (dotted square area 860) is not mounted on the printed circuit board of the controller unit 110.

[0086] When mounting the connector (dotted square area 860) on the printed circuit board of the controller unit 110, the button battery with electrodes is not mounted on the printed circuit board of the controller unit 110.

[0087] In this case, by attaching the button battery socket mounting board 880 to the controller unit 110, the clock unit 165 is powered by a button battery attached to the button battery socket via a connector (dotted square area 860 and dotted square area 870).

[0088] Note that the first and second button batteries can be either identical or non-identical in specifications.

[0089] In short, the first button battery just needs to be able to be inserted into the socket and for the electrodes of the socket and the electrodes of the first button battery to make contact. Also, the second button battery just needs to be able to be mounted on the printed circuit board in the same way as the first button battery, and for the electrodes, pattern restriction area and outline area of ​​the second button battery to be equivalent to the electrodes, pattern restriction area and outline area of ​​the first button battery.

[0090] Furthermore, as long as the printed circuit board can accommodate it, it is not a problem even if the electrical specifications, such as the voltage of the first button battery and the second button battery, are different.

[0091] Preferred embodiments of the present invention have been described above. However, the present invention is not limited to the embodiments described above. That is, the present invention includes embodiments that have been modified in accordance with the spirit of the present invention, and these embodiments are not excluded from the scope of the present invention. [Explanation of Symbols]

[0092] 200, 210, 220 First Outer Region 230, 231, 232, 240, 250 Second outer region 300, 310 First Implementation Land 320 First pattern prohibition area 330, 340 Second Implementation Land 350 Second pattern prohibition area

Claims

1. In a printed circuit board capable of mounting a socket for a first button battery or a second button battery, The first button battery has a first electrode, a first pattern exclusion area, and a first outer shape area. The socket has a second electrode, a second pattern prohibition area, and a second outer shape area. The printed circuit board has a first mounting land for mounting the first electrode and a second mounting land for mounting the second electrode. The first mounting land is located in a region of the printed circuit board that is different from the second pattern prohibition area, and the second mounting land is located in a region of the printed circuit board that is different from the first pattern prohibition area. The first mounting land and the second mounting land are arranged on the printed circuit board such that at least a portion of the first outer region and the second outer region overlap on the printed circuit board. A printed circuit board characterized by the following features.

2. The first button battery is connected to the electrodes of the first button battery via a member for connecting the pattern on the printed circuit board. A printed circuit board according to claim 1, characterized in that...

3. The first external region is the region of the printed circuit board necessary for mounting the first button battery, and the second external region is the region of the printed circuit board necessary for mounting the socket. A printed circuit board according to claim 1, characterized in that...

4. The second button battery can be inserted into the socket. A printed circuit board according to claim 1, characterized in that...

5. The first pattern prohibition area is an area on the printed circuit board on which the first button battery is mounted that prohibits the placement of patterns, based on constraints related to the component mounting of the first button battery. A printed circuit board according to claim 1, characterized in that...

6. The constraints relating to the component mounting of the first button battery are to prevent the electrodes of the first button battery from coming into contact with a pattern on the printed circuit board that is different from the mounting land of the first button battery. The printed circuit board according to claim 5, characterized in that it is a printed circuit board.

7. The printed circuit board pattern that is different from the mounting land for the first button battery is the wiring pattern of the printed circuit board or the VIA of the wiring pattern. A printed circuit board according to claim 6, characterized in that it is a printed circuit board.

8. The second pattern prohibition area is an area on the printed circuit board on which the socket is mounted that prohibits the placement of patterns, based on constraints related to the component mounting of the socket. A printed circuit board according to claim 1, characterized in that...

9. The constraints relating to component mounting on the socket are to prevent the mounting lands of the socket from being positioned in a way that encroaches on the lower surface of the socket. The printed circuit board according to claim 8, characterized in that...

10. The constraint relating to component mounting on the aforementioned socket is a constraint to avoid placing the pattern VIA of the printed circuit board on the lower surface of the socket. The printed circuit board according to claim 8, characterized in that...

11. The pattern VIA of the printed circuit board is the VIA of the wiring pattern and GND pattern of the printed circuit board. A printed circuit board according to claim 10, characterized in that...

12. The first button battery can be inserted into the socket. A printed circuit board according to claim 1, characterized in that...

13. The electrodes of the second button cell, the second pattern prohibition area, and the second outer shape area are identical to the first electrodes, the first pattern prohibition area, and the first outer shape area. A printed circuit board according to claim 1, characterized in that...

14. The first button battery and the second button battery are identical in specifications. A printed circuit board according to claim 1, characterized in that...

15. The electrode of the first button battery and the first button battery connected via the member are mounted, The printed circuit board according to claim 2.

16. The second button battery is installed in the socket, The printed circuit board according to claim 1.

17. A printed circuit board characterized by having the printed circuit board described in claim 15, Image forming apparatus.

18. A printed circuit board characterized by having the printed circuit board described in claim 16, Image forming apparatus.

Images