JP2008140844A - Printed-wiring board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a printed-wiring board capable of selecting different functions without increasing the number of parts and without the setting works of a switch or the like. <P>SOLUTION: The printed-wiring board has a fixing section to a box body and a circuit function selecting section fitted to the fixing section. The fixing section is partitioned by a region mechanically brought into contact with a fixing member, and an electrical connection state between the circuit function selecting section and the box body is specified by the fixing member. The fixing section has a configuration selecting a specified circuit function from a plurality of circuit functions of the printed-wiring board in response to the electrical connection state. Accordingly, when the printed-wiring board is fixed to the box body by the fixing member, a resistance value (the electrical connection state) between the pattern of a conductor for the circuit function selecting section and the box body is defined by the conductivity or insulating property of the fixing member because the circuit function selecting section is brought into contact mechanically with the fixing member, and the printed-wiring board can select the specified circuit function from the plurality of circuit functions of the printed-wiring board. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a printed wiring board of an electric / electronic device capable of realizing different specifications by using a common printed wiring board.

Even if the electrical / electronic device (which may be indicated as “electronic device” in this specification) is the same type of electronic device, for example, to meet the diversification of customer needs or the destination Different specifications (different functions) are required in order to correspond to different power supply voltages for each (export destination) (for example, electronic devices that have the same external appearance and other specifications with different power supply voltages for different destinations). However, if different printed circuit boards are manufactured by designing different circuits for each specification, the cost of the electronic device cannot be reduced, and the design period cannot be shortened. Therefore, a specific circuit function is selected by setting a switch provided on the printed wiring board, or a connector for setting the circuit function is mounted on the printed wiring board, and the connection relationship of the connector connection pins corresponding to different circuit functions is defined. In addition, by selecting the connection relationship of the connector connection pins and selecting specific circuit functions, a printed wiring board that can selectively realize different circuit functions is designed to reduce costs and design The period is shortened. When such a printed wiring board is incorporated into an electronic device, a switch for selecting a circuit function is set according to a procedure instructed in advance by an operator, a connector for selecting a circuit function is connected, or a printed wiring board is connected to the printed wiring board. A plurality of terminals (terminal group) are provided, and the terminals are selectively short-circuited (for example, Patent Document 1), and assembled as electronic devices having different specifications.
JP 2001-286168 A

  However, mounting a switch, connector, or group of terminals for selecting circuit functions on a printed wiring board increases the number of parts of the printed wiring board, obstructing the downsizing of the printed wiring board and the electronic equipment. In addition, the material cost increases and the working time for setting switches, connectors, shorting between terminals and the like increases, and the cost reduction of the electronic device is hindered. Therefore, the present invention provides a printed wiring board that can selectively realize different circuit functions without increasing the number of parts of the printed wiring board and without requiring a switch setting operation and the like, and can reduce the design cost. The task is to do.

  In order to solve the above problems, a printed wiring board according to the present invention is a printed wiring board fixed to a casing of an electronic device, and a fixing portion for fixing the printed wiring board to the casing by a fixing member; The fixing unit has a circuit function selection unit, the fixing unit is defined by an area that mechanically contacts the fixing member, and an electrical connection state between the circuit function selection unit and the housing is defined by the fixing member, Corresponding to the electrical connection state, a specific circuit function is selected from a plurality of circuit functions of the printed wiring board.

  Here, in the case where the printed wiring board is screwed to the housing, the fixing portion has a screw hole for screwing and a circuit function selecting portion, and the circuit function selecting portion is the front surface or the back surface of the printed wiring board. If the printed wiring board is fixed to the housing with the fixing member using a screw having a shape that fits the screw hole of the fixing portion as the fixing member Then, the conductor pattern of the circuit function selection unit is in mechanical contact with the fixing member. If the fixing members are all conductors (for example, metal male screws, female screw seats, spacers, etc.), the conductor pattern of the circuit function selection unit is electrically connected to the housing, and the fixing members are insulators. In the case of (for example, a plastic male screw), the conductor pattern of the circuit function selection unit is electrically insulated from the housing. That is, since the resistance value (electrical connection state) between the conductor pattern of the circuit function selection unit and the housing is defined by the difference in the fixing member, the printed wiring board is based on the difference in the electrical connection state. A specific circuit function can be selected from a plurality of circuit functions of the printed wiring board (claims 1 and 3).

  A printed wiring board according to claim 2 is a printed wiring board fixed to a housing of an electronic device, and is provided with a fixing portion for fixing the printed wiring board to the housing with a fixing member, and the fixing portion. Having a circuit function selection unit, the fixed unit is defined by a region that is in mechanical contact with the fixing member, the circuit function selection unit includes a plurality of electrodes, and an electrical connection state between the plurality of electrodes is defined by the fixing member; Corresponding to the electrical connection state, a specific circuit function is selected from a plurality of circuit functions of the printed wiring board.

  Here, in the case where the printed wiring board is screwed to the housing, the fixing portion has a screw hole for screwing and a circuit function selecting portion, and the circuit function selecting portion is the front surface or the back surface of the printed wiring board. If the printed wiring board is fixed to the housing with a fixing member using a screw that fits into the screw hole of the fixing portion as a fixing member, the conductor pattern of the circuit function selection portion is It will be in mechanical contact with the fixed member. Here, if all the fixing members are conductors, the plurality of electrodes of the circuit function selection unit are electrically connected to each other and are also electrically connected to the housing. If all the fixing members are insulators, The plurality of electrodes of the selection unit are electrically insulated from each other and from the housing. In addition, if the fixing member has only the spacer as a conductor and the male screw and the female screw as an insulator, the plurality of electrodes of the circuit function selection unit are electrically connected by the spacer. That is, since the resistance value (electrical connection state) between the plurality of electrodes of the circuit function selection unit and between the electrode and the housing is defined by the difference in the fixing member, the printed wiring board has more circuit functions. A specific circuit function can be selected from (Claims 2 and 3).

  As described above, the printed wiring board according to the present invention is a fixing member for fixing the printed wiring board to the housing without using parts such as a switch (without increasing the number of parts of the printed wiring board). Depending on the selection (selection of conductor or insulator), a specific circuit function can be selected from many circuit functions. Thus, the printed wiring board according to the present invention can achieve the effects of downsizing the printed wiring board, reducing the material cost, and shortening the manufacturing work time, while reducing the design cost and the design period of the printed wiring board.

  Hereinafter, a printed wiring board according to the present invention will be described with reference to the drawings.

  An embodiment of a printed wiring board according to the present invention will be described with reference to FIGS. In the printed wiring board 10 having a rectangular shape, the screw portion 31a of the male screw 31 is inserted into the screw hole 11 formed in the vicinity of the four corners of the printed wiring board 10 from the surface 10a side of the printed wiring board 10. Further, FIG. 1 is a perspective view showing a schematic configuration of one corner of the printed wiring board 10, and the male screw 31 is attached to the housing 20 by fastening the male screw 31 to the female screw seat 32 of the housing 20. . At the time of this attachment, a spacer (washer) 33 is positioned between the head 31b of the male screw 31 and the printed wiring board 10 (in FIG. 1, the fixing member 30 includes the male screw 31, the female screw seat 32, and the spacer. 33). The housing 20 may be a structure for housing and fixing the printed wiring board 10 in an electronic device or a part thereof. For example, an outer housing of the electronic device, a columnar member or a plate-like member constituting the outer housing. Further, it may be a ground plate (ground plane) or a heat radiating plate attached to the outer casing or the like.

  The fixing portion 12 is defined by a region where the spacer 33 is in mechanical contact with the surface 10a of the printed wiring board 10. The outline of the fixing portion 12 is indicated by a broken line circle 33a in FIG. The outline of the region where the spacer 33 is in mechanical contact with the surface 10a of the printed wiring board 10). In the fixing part 12, the conductor patterns 13 a and 13 b having a shape obtained by dividing the circular ring into approximately two equal parts are positioned outside the screw hole 11 formed in the central part of the fixing part 12 to constitute the circuit function selection part 13. is doing. Therefore, when the printed wiring board 10 is fixed to the housing 20 using the fixing member 30, the conductor patterns 13 a and 13 b are in mechanical contact with the spacer 33. Here, the conductor patterns 13a and 13b are connected to, for example, input terminals of a logic circuit (not shown) via the wiring patterns 14a and 14b, respectively. The conductor patterns 13a and 13b may be positioned inside and outside the broken-line circle 33a shown in FIG. 2A (the circuit function selection unit 13 at least in the region inside the broken-line circle 33a and the conductor patterns 13a and 13b. 13b).

  Therefore, when the printed wiring board 10 is fixed to the housing 20 using the fixing member 30 in which the male screw 31, the female screw seat 32, and the spacer 33 are all formed of a conductor, the conductor patterns 13a and 13b are electrically connected to each other. And is electrically connected to the housing 20 (ground potential) (FIG. 2B). Further, when the printed wiring board 10 is fixed to the housing 20 by using the fixing member 30 having the conductor spacer 33 and the external male screw 31, the conductor patterns 13 a and 13 b are electrically connected to each other. However, it is electrically insulated from the housing 20 (FIG. 2C). Of course, when the spacer 33 is an insulator, the conductor patterns 13a and 13b are electrically insulated from each other and from the housing 20 as well.

  Thus, according to the configuration of the fixing member 30, the printed wiring board 10 has an electrical connection state between the conductor patterns 13 a and 13 b (circuit function selection unit 13) and the housing 20, and the conductor patterns 13 a and 13 b (a plurality of electrodes). ) Is defined. Accordingly, if the conductor patterns 13a and 13b are connected to the logic circuit or the like (not shown) constituting the lookup table via the wiring patterns 14a and 14b, the printed wiring board 10 is connected to the conductor patterns 13a and 13b. A specific circuit function can be selected from a plurality of circuit functions in accordance with the electrical connection state between the circuit board 20 and the housing 20, and the circuit operation (function / specification, etc.) of the electronic device mounting the printed wiring board 10 can be set. Here, when all of the fixing portions 12 near the four corners of the printed wiring board 10 have the circuit function selection portions 13, the four fixing members 30 for fixing the four fixing portions 12 are respectively conductors or insulators. By selecting, it is possible to determine the electrical connection state related to the circuit function selection unit 13, and therefore it is possible to select a specific circuit function from more circuit functions.

FIG. 3 is a view showing a modification of the electrodes constituting the circuit function selection unit 13. In FIG. 3A, the conductor patterns 13c, 13d, 13e, and 13f (a plurality of electrodes) obtained by dividing the ring into approximately four equal parts are positioned outside the screw holes 11 to constitute the circuit function selection unit 13. Yes. Thus, in the printed wiring board 10, the circuit function can be selected more flexibly by increasing the number of electrodes of the circuit function selection unit 13 (the number of circuit functions selected can be increased). In FIG. 3B, concentric annular conductor patterns 13 g and 13 h (a plurality of electrodes) are positioned outside the screw hole 11 to constitute the circuit function selection unit 13. For example, if the printed wiring board 10 is a multilayer printed wiring board, the concentric inner conductor pattern 13g is connected to a logic circuit (not shown) via a wiring pattern inside the printed wiring board. Of course, the circuit function selection unit 13 may be configured by one ring-shaped electrode, and in this case, the circuit function selection is performed depending on whether or not the circuit function selection unit 13 is electrically connected to the housing 20. Done.
(Modification)
Next, based on FIG.4 and FIG.5, the modification (printed wiring board 10 ') of the printed wiring board 10 is demonstrated. In addition, the same code | symbol is attached | subjected to the component which has the function similar to the printed wiring board 10, and the description is abbreviate | omitted. As shown in FIG. 4A, the printed wiring board 10 ′ having a rectangular shape has the fixing portions 12a and 12b in the corner vicinity region 15a, the fixing portions 12c and 12d in the corner vicinity region 15b, and the corner vicinity region 15c. The fixing portion 12e is provided, and the fixing portion 12f is provided in the corner vicinity region 15d. Here, the fixing portions 12a to 12d are respectively provided with conductor patterns 13a and 13b constituting the circuit function selecting portion 13 (FIG. 5 is a perspective view of the corner vicinity region 15a). The circuit function selection unit 13 is not provided in 12f.

  In such a printed wiring board 10 ′, when the corner vicinity regions 15a, 15b, 15c and 15d are each fixed by one fixing member 30, the fixing portions 12e and 12f are necessarily fixed, and any of the fixing portions 12a and 12b is fixed. On the other hand, either one of the fixing portions 12c and 12d is fixed. Therefore, there are four ways of fixing as shown in FIG. 4B (in FIG. 4B, a circle indicates a fixing portion fixed by the fixing member 30). Therefore, for example, there are four ways of electrical connection between the fixing portions 12a to 12d and the housing 20 when all the components are fixed by the fixing member 30 formed of a conductor. Further, among the fixing portions 12a to 12d, there are four ways of fixing the three fixing portions with the fixing member 30 by combining three of the four fixing portions. Further, since all of the fixing portions 12a to 12d can be fixed, the printed wiring board 10 'can select a specific circuit function from among more circuit functions. Moreover, since these screwing methods can be visually discriminated, there is an advantage that it is easy to find an erroneous setting (an error in the screwing method) (for example, the circuit function selection state is automatically identified and inspected by image processing). Easy to do).

Further, by defining the electrical connection between the conductor patterns 13a and 13b of the circuit function selection unit 13 included in the fixing units 12a to 12d, when selecting the circuit function in the printed wiring board 10 ′, the fixing member 30 is used. The male screw 31, the female screw seat 32, and the spacer 33 may be used, and the male screw 31 may be an insulator and the spacer 33 may be a conductor.
The selection of the circuit function in the present invention is not limited to the setting of the power supply voltage specification in the same model of electronic equipment or the selection of the specification according to the customer's needs. A specific circuit is selected from a plurality of circuit functions of the printed wiring board. Includes everything that selects a function. For example, any circuit function selection in a printed wiring board is included in the case where a specific circuit operation is selected in a test for adjustment or maintenance in an electronic device manufacturing process.

  The present invention is not limited to the above embodiments, and can be appropriately modified and implemented without departing from the spirit of the present invention. For example, the circuit function selection unit is provided not on the front surface of the printed wiring board but on the back surface, and the circuit function selection unit is in mechanical contact with the female screw seat or a spacer positioned between the female screw seat and the printed wiring board back surface. You may do it. In this case, the fixing portion is a portion defined by a region where the back surface of the printed wiring board is in mechanical contact with the female screw seat or the spacer, and the female screw seat and the spacer are connected to the circuit function selection unit and the housing. And the electrical connection state between the plurality of electrodes of the circuit function selection unit. The fixing member is not limited to the fixing member by screwing as long as the printed wiring board is fixed to the casing (for example, the fixing is performed by pressing the printed wiring board against the casing with a spring). Etc.)

It is a perspective view which shows schematic structure of the corner of the printed wiring board concerning this invention. FIG. 2A is a plan view illustrating a schematic configuration in the vicinity of a fixed portion included in the printed wiring board illustrated in FIG. 1, and a diagram illustrating electrical connection between a plurality of electrodes included in a circuit function selection unit and a housing (b) ) (C). It is a figure which shows the modification of the electrode shape which a circuit function selection part has. It is a top view which shows the fixing | fixed part provided in each corner in the modification of the printed wiring board concerning this invention, (a), It is a combination figure of the method of fixing which fixes each corner with one fixing member (b). . It is a perspective view which shows schematic structure of the corner in the modification of the printed wiring board concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10 'Printed wiring board 10a The surface of a printed wiring board 11 Screw hole 12 Fixed part 13 Circuit function selection part 13a, 13b Conductor pattern (electrode)
20 Housing 30 Fixing member 31 Male screw 32 Female screw seat 33 Spacer

Claims (3)

A printed wiring board fixed to a housing of an electronic device,
A fixing portion for fixing the printed wiring board to the housing by a fixing member;
A circuit function selection unit provided in the fixed unit;
The fixing portion is defined by a region that is in mechanical contact with the fixing member;
An electrical connection state between the circuit function selection unit and the housing is defined by the fixing member,
A printed circuit board, wherein a specific circuit function is selected from a plurality of circuit functions of the printed circuit board corresponding to the electrical connection state. A printed wiring board fixed to a housing of an electronic device,
A fixing portion for fixing the printed wiring board to the housing by a fixing member;
A circuit function selection unit provided in the fixed unit;
The fixing portion is defined by a region that is in mechanical contact with the fixing member;
The circuit function selection unit includes a plurality of electrodes,
An electrical connection state between the plurality of electrodes is defined by the fixing member,
A printed circuit board, wherein a specific circuit function is selected from a plurality of circuit functions of the printed circuit board corresponding to the electrical connection state.   The said fixing part has a circuit function selection part provided with a screw hole for screwing the printed wiring board and a conductor pattern provided on the front surface or the back surface of the printed wiring board. The printed wiring board according to any one of 1 and 2.

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