JP2009176774A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus in which the number of components for electrically connecting a ground region of a circuit board to a casing is reduced, workability is improved and a configuration is simplified. <P>SOLUTION: A DVD player 1 as the electronic apparatus is provided with a circuit board 6 having an electronic component mounted thereon, a metallic casing 2 for housing the circuit board 6, and a ground connection member 8 having conductivity for electrically connecting a ground region 62 of the circuit board 6 to the casing 2. The ground connection member 8 has a substrate bonding portion 81 bonded by solder to the ground region 62 of the circuit board 6, and a casing abutting portion 82 abutting on a rear panel 24 of the casing 2. When the circuit board 6 bonded with the ground connection member 8 is housed in the casing 2, the rear panel 24 of the casing 2 is brought into a state of pressing the casing abutting portion 82 of the ground connection member 8, and the casing abutting portion 82 of the ground connection member 8 is pressed by the rear panel 24 and brought into a state of abutting on the rear panel 24. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic device that houses a circuit board in a housing.

  Conventionally, for example, an electronic device such as a DVD player or a projector stores a circuit board on which an electronic component is mounted in a housing. In addition, in such an electronic device, there is a type in which the casing is made of metal and the ground region of the circuit board and the casing are electrically connected. As such an electronic apparatus, one having the configuration shown in FIG. 6 is known.

  The electronic device 90 shown in FIG. 6 has a circuit board 92 housed in a metal casing 91, and a ground connection member 93 electrically connects the ground region 94 of the circuit board 92 and the casing 91. Yes. The casing 91 includes a splittable top panel 95, under panel 96, rear panel 97, and front panel (not shown). The circuit board 92 is held by a board holder 98 fixed to the under panel 96, and is fixed to the under panel 96 via the board holder 98.

  The ground connection member 93 is formed by bending a sheet metal. The ground connection member 93 is screwed to the ground region 94 of the circuit board 92 by screws 99a, and is screwed to the rear panel 97 (the casing 91) by screws 99b. Has been. The ground connection member 93 is screwed to the ground region 94 and the rear panel 97 of the circuit board 92 with screws 99a and 99b, so that the ground connection member 93 is in contact with the ground region 94 and the rear panel 97 of the circuit board 92. The ground region 94 of the circuit board 92 and the rear panel 97 are electrically connected by the ground connection member 93.

On the other hand, the metal member provided with the elastic conductor is screwed to the metal cover with a screw to bring the elastic conductor provided on the metal cover into contact with the ground region of the circuit board. There is known an electronic device in which a ground region and a metal cover are electrically connected (see, for example, Patent Document 1). In addition, an electronic device is known in which a grounding plate is developed to ensure a solder amount and a circuit board and a metal chassis are joined by solder (for example, see Patent Document 2). In addition, a folded piece and a convex portion are formed on the panel fixing sheet metal that supports the liquid crystal panel, and solder marks are formed on the front and back surfaces of the circuit board. 2. Description of the Related Art An electronic device is known in which a circuit board is fixed to a panel fixing sheet metal by being inserted into a gap formed by a convex portion, and the circuit board and the panel fixing sheet metal are electrically connected (for example, see Patent Document 3). ). There is also known an electronic apparatus in which a circuit board and a conductive panel are fastened together with an insulating case with screws to electrically connect the circuit board and the conductive panel (see, for example, Patent Document 4). .
JP 2005-215185 A JP 2001-60886 A JP 2007-116556 A JP 2007-59070 A

  However, in the above-described conventional electronic device 90, the ground connection member 93 is screwed with screws 99a and 99b to electrically connect the ground region 94 of the circuit board 92 and the casing 91 (rear panel 97). It is like that. For this reason, the number of parts for electrically connecting the ground region 94 of the circuit board 92 and the housing 91 is large, and the cost increases. In addition, since the screwing operation is complicated, the workability for electrically connecting the ground region 94 of the circuit board 92 and the housing 91 is low, and the cost is high.

  Therefore, it is conceivable to reduce the number of parts by electrically connecting the ground region 94 of the circuit board 92 and the housing 91 without using screws. In this case, in order to reduce the cost, it is necessary to easily connect the ground region 94 of the circuit board 92 and the casing 91 to improve workability and to make the configuration complicated. In addition, it is necessary to realize a simple configuration without changing the conventional configuration as much as possible. Even if the contents disclosed in Patent Document 1 to Patent Document 4 described above are applied, the above problem cannot be solved.

  The present invention has been made to solve the above-described problem, and reduces the number of parts for electrically connecting the ground region of the circuit board and the housing, and the ground region and the housing of the circuit board. An electronic device capable of improving the workability for electrical connection and realizing a configuration for electrically connecting the ground region of the circuit board and the housing with a simple configuration, thereby reducing costs. The purpose is to provide.

  In order to achieve the above object, an invention according to claim 1 is an electronic device including a circuit board on which an electronic component is mounted and a metal housing for housing the circuit board. A ground connection member having electrical conductivity for electrical connection is provided. The ground connection member includes a board joint portion that is soldered and joined to the ground region of the circuit board, and a housing contact that contacts the housing. And a contact portion.

  According to a second aspect of the present invention, in the electronic device according to the first aspect, the housing is in a state where the housing contact portion of the ground connection member is pressed when the circuit board is housed, and the housing of the ground connection member. The body contact portion is pressed by the housing and is in contact with the housing.

  According to a third aspect of the present invention, in the electronic device according to the second aspect, the housing contact portion of the ground connection member can be independently deformed and can be independently contacted with the housing. It has a connector.

  According to the first aspect of the present invention, the board connecting portion of the ground connecting member is soldered and joined to the ground region of the circuit board, and the housing contact portion of the ground connecting member is brought into contact with the housing. The ground region of the circuit board and the housing are electrically connected. Therefore, the number of components for electrically connecting the ground region of the circuit board and the housing can be reduced as compared with the conventional configuration in which the ground connection member is screwed. In addition, the ground region of the circuit board and the housing can be easily electrically connected, and the workability for electrically connecting the ground region of the circuit board and the housing can be improved. In addition to the ground connection member, there is no need to change the conventional configuration without complicating the configuration, and the configuration for electrically connecting the ground region of the circuit board and the housing is simple. Can be realized. Thereby, cost reduction can be aimed at.

  According to the second aspect of the present invention, since the casing contact portion of the ground connection member is pressed by the casing and is in contact with the housing, the ground connection member and the casing are more reliably brought into contact with each other. Thus, the ground region of the circuit board and the housing can be more reliably electrically connected. Moreover, when the circuit board to which the ground connection member is joined by soldering is stored in the housing, the housing contact portion of the ground connection member is pressed against the housing and comes into contact with the housing. The workability for electrically connecting the ground region of the circuit board and the housing can be further improved.

  According to the invention of claim 3, when the housing contact portion of the ground connection member is pressed by the housing, each partial contact of the housing contact portion is independently pressed and deformed by the housing, Each partial contact of the housing contact portion is in a state of being in contact with the housing independently. Therefore, the contact area between the housing contact portion and the housing of the ground connection member can be increased, and the ground region of the circuit board and the housing can be more reliably electrically connected. In addition, before assembling the electronic device, some object (an assembly worker's hand or another assembly member) unexpectedly contacts the housing contact portion of the ground connection member, and the housing contact portion is deformed. Even then, among the plurality of partial abutments of the housing abutment portion, only the partial abutment with which the object has contacted will be independently deformed, and other partial abutments with which the object has not contacted will be Does not deform. The non-deformed partial abutment normally functions so as to be pressed against the housing and contact the housing when the electronic apparatus is assembled. Therefore, even if an object suddenly comes into contact with the housing contact portion of the ground connection member during the assembly work of the electronic device and a part of the partial contact element is deformed, the assembly of the electronic device is not caused. The possibility that the work can be continued is high, and the workability for assembling the electronic device can be improved.

  Hereinafter, an electronic device according to an embodiment of the present invention will be described with reference to the drawings. 1, 2A, and 2B show the configuration of a DVD player that is an electronic apparatus according to the present embodiment. The DVD player 1 is an electronic device that reproduces information from a DVD.

  As shown in FIG. 1, the DVD player 1 includes a housing 2, a DVD insertion slot 3, an operation switch 4, a liquid crystal display unit 5, and the like. The housing 2 is made of metal, and includes a front panel 21, a top panel 22, an under panel 23, and a rear panel 24 that can be divided. The DVD insertion slot 3, the operation switch 4, and the liquid crystal display unit 5 are provided on the front panel 21.

  As shown in FIGS. 2A and 2B, the DVD player 1 includes a circuit board 6, a board holder 7, a ground connection member 8, and the like in the housing 2. That is, the housing 2 accommodates the circuit board 6, the board holder 7, the ground connection member 8, and the like.

  The circuit board 6 is a so-called PCB board, and has a structure in which circuit wiring (not shown) and a ground region 62 are formed on a rigid insulating board 61. Various electronic components (not shown) are mounted on the circuit board 6. The board holder 7 is fixed to the under panel 23 of the housing 2 and holds the circuit board 6 in a posture parallel to the inner surface of the upper wall portion 24a of the rear panel 24. That is, the circuit board 6 is fixed to the under panel 23 through the board holder 7 so as to be parallel to the inner surface of the upper wall portion 24a of the rear panel 24.

  The ground connection member 8 is for electrically connecting the ground region 62 of the circuit board 6 and the housing 2. The ground connection member 8 has conductivity, and is soldered and joined to the ground region 62 of the circuit board 6 with solder 89 and pressed against the inner surface of the upper wall portion 24a of the rear panel 24 of the housing 2. And contacted (see FIG. 2B). That is, in the DVD player 1, the ground region 62 of the circuit board 6 and the rear panel 24 of the housing 2 are electrically connected by the ground connection member 8.

  FIG. 3 shows the configuration of the ground connection member 8. The ground connection member 8 is integrally formed of a conductive material such as stainless steel, and includes a substrate bonding portion 81, a housing contact portion 82, and an intermediate connecting portion 83. The substrate bonding portion 81 is a portion that is soldered and bonded to the ground region 62 of the circuit board 6. The housing abutting portion 82 is a portion that abuts on the inner surface of the upper wall portion 24 of the rear panel 24. The intermediate connecting portion 83 is a portion in the middle between the substrate bonding portion 81 and the housing contact portion 82.

  The casing contact portion 82 and the intermediate connecting portion 83 are formed thin. The casing contact portion 82 and the intermediate connecting portion 83 are formed thin, so that deformation (elastic deformation and plastic deformation) is possible. The intermediate joint portion 83 is bent halfway.

  The housing contact portion 82 includes a plurality of partial contact members 82a. The plurality of partial abutments 82 a are formed by providing a plurality of cuts 82 b in the housing abutment portion 82. Each partial abutment 82a can be independently deformed by having a notch 82b between adjacent partial abutments 82a. Therefore, each partial contact 82a deforms independently when pressed against the inner surface of the upper wall portion 24a of the rear panel 24, and independently contacts the inner surface of the upper wall portion 24 of the rear panel 24. To be able to be.

  FIG. 4 shows a configuration when the ground connection member 8 is bonded to the circuit board 6. Before assembling the DVD player 1 (before housing the circuit board 6 in the housing 2), the ground connection member 8 is joined to the ground region 62 of the circuit board 6 by soldering with the solder 89. The

  At this time, the ground connection member 8 is joined to the ground region 62 of the circuit board 6 in such a posture that the arrangement direction of the plurality of partial contactors 82 a is substantially parallel to the circuit board 6. The ground connection member 8 is configured such that the housing contact portion 82 is inclined with respect to the circuit board 6, and the front end side of the housing contact portion 82 is the highest (away from the circuit board 6). The ground region 62 is joined. Further, the ground connection member 8 has a housing abutting portion 82 from the rear edge 6a of the circuit board 6 (an edge opposite to the side wall 24b of the rear panel 24 when the DVD player 1 is assembled) to the center side. It is joined to the ground region 62 of the circuit board 6 in such a posture as to become higher (away from the circuit board 6) as it goes.

  The ground connecting member 8 has a height T1 from the circuit board 6 when joined to the circuit board 6 to the front end side of the housing abutting portion 82. The height T1 from the circuit board 6 when the DVD player 1 is assembled to the rear panel. The dimension is designed so that it may become higher than the height T2 to the inner surface of 24 upper wall part 24a.

  5A, 5B, and 5C show a method for assembling the DVD player 1. FIG. The DVD player 1 is assembled as follows.

  First, the board joint portion 81 of the ground connection member 8 is soldered and joined to the ground region 62 of the circuit board 6, and the circuit board 6 to which the ground connection member 8 is joined is attached to the board holder 7 (that is, the under panel). After that, the front panel 21 and the top panel 22 are joined to the under panel 23 (see FIG. 5A).

  In this state, the rear panel 24 is not coupled to the top panel 22 and the under panel 23, and the ground connection member 8 is exposed from the housing 2. The housing contact portion 82 of the ground connection member 8 is inclined so as to approach the upper wall portion 24a of the rear panel 24 as it moves away from the side wall portion 24b of the rear panel 24 to be coupled. The side is positioned higher than the inner surface of the upper wall portion 24a of the rear panel 24 when the rear panel 24 is joined.

  Subsequently, the inner surface of the upper wall portion 24a of the rear panel 24 is brought into contact with the distal end side of the housing contact portion 82 of the ground connection member 8 (see FIG. 5B). At this time, the housing contact portion 82 of the ground connection member 8 is inclined so as to approach the upper wall portion 24a of the rear panel 24 as the distance from the side wall portion 24b of the rear panel 24 increases. The front end side of the contact portion 82 is not caught by the edge 24 c of the upper wall portion 24 a of the rear panel 24. Therefore, the inner surface of the upper wall portion 24a of the rear panel 24 can be easily brought into contact with the distal end side of the housing contact portion 82 of the ground connection member 8.

  Then, the rear panel 24 is coupled to the top panel 22 and the under panel 23 while pressing the front end side of the housing contact portion 82 of the ground connection member 8 with the inner surface of the upper wall portion 24a of the rear panel 24 (FIG. 5C). reference). As a result, the circuit board 6 to which the ground connection member 8 is bonded is housed in the housing 2 and the DVD player 1 is assembled. In this state, the inner surface of the upper wall portion 24a of the rear panel 24 is in a state of pressing the distal end side of each partial contact 82a of the housing contact portion 82 of the ground connection member 8, and the ground connection member 8 Each partial contact 82a is pressed against the inner surface of the upper wall portion 24a of the rear panel 24 and is in contact with the inner surface of the upper wall portion 24a of the rear panel 24, respectively. The DVD player 1 is assembled in this way.

  In the DVD player 1 assembled in this way, the board connection portion 81 of the ground connection member 8 is soldered and joined to the ground region 62 of the circuit board 6 by the solder 89, and the ground connection member 8 Each partial contact piece 82a is pressed against and contacted with the inner surface of the upper wall portion 24a of the rear panel 24 of the housing 2, and the ground region 62 and the rear panel 24 of the circuit board 6 are connected by the ground connecting member 8. It is in an electrically connected state.

  As described above, according to the DVD player 1 configured as described above, the board joint 81 of the ground connection member 8 is soldered and joined to the ground region 62 of the circuit board 6, and the housing of the ground connection member 8 is in contact with the housing. When the part 82 is brought into contact with the rear panel 24, the ground region 62 of the circuit board 6 and the rear panel 24 are electrically connected.

  Therefore, the number of parts for electrically connecting the ground region 62 of the circuit board 6 and the rear panel 24 can be reduced as compared with the conventional screw-fixed configuration. In addition, the ground region 62 of the circuit board 6 and the rear panel 24 can be easily electrically connected, and the workability for electrically connecting the ground region 62 of the circuit board 6 and the rear panel 24 is improved. Can do. In addition, a configuration for electrically connecting the ground region 62 of the circuit board 6 and the rear panel 24 can be realized by a simple configuration.

  Moreover, since the housing contact portion 82 of the ground connection member 8 is pressed against the rear panel 24 and is in contact with the rear panel 24, the ground connection member 8 and the rear panel 24 are more reliably brought into contact with each other. Thus, the ground region 62 of the circuit board 6 and the rear panel 24 can be electrically connected more reliably.

  Moreover, the housing of the ground connection member 8 can be obtained simply by performing the operation of connecting the rear panel 24 to the top panel 22 and the under panel 23 (operation of housing the circuit board 6 to which the ground connection member 8 is bonded in the housing 2). Since the contact portion 82 is pressed against the rear panel 24 by the rear panel 24, the workability for electrically connecting the ground region 62 of the circuit board 6 and the rear panel 24 can be further improved. it can.

  Further, since the housing contact portion 82 of the ground connection member 8 has a plurality of partial contact members 82 a, when the housing contact portion 8 of the ground connection member 8 is pressed against the rear panel 24, the housing contact portion 8. Each of the partial contactors 82a is independently pressed by the rear panel 24 and deformed, and each partial contactor 82a is in contact with the rear panel 24 independently. Therefore, the contact area between the housing contact portion 82 of the ground connection member 8 and the rear panel 24 can be increased, and the ground region 62 of the circuit board 6 and the rear panel 24 are more reliably electrically connected. can do.

  Further, since the housing abutting portion 82 of the ground connection member 8 has a plurality of partial abutting members 82a, an object (an assembly worker's hand or another assembling member) is unexpectedly moved before the DVD player 1 is assembled. Even if the housing contact portion 82 comes into contact with the housing contact portion 82 of the ground connection member 8 and the housing contact portion 82 is deformed, the object contacts the plurality of partial contact members 82a of the housing contact portion 82. Only the partial contactor 82a thus deformed is deformed independently, and the other partial contactors 82a that are not in contact with the object are not deformed. The partial abutment 82a that has not been deformed normally functions so as to be pressed against the rear panel 24 and brought into contact with the rear panel 24 when the DVD player 1 is assembled. Therefore, even if an object unexpectedly contacts the housing contact portion 82 of the ground connection member 8 during the assembly work of the DVD player, there is a high possibility that the assembly work of the DVD player 1 can be continued without causing any trouble. The workability for assembling the DVD player 1 can be improved.

  In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible. For example, the ground connection member is not limited to the inner surface of the upper wall portion of the rear panel, and may be configured to contact the inner surface of the side wall portion of the rear panel, or contact the inner surface of the top panel or the under panel. You may come to be. In addition, the functional unit for realizing a predetermined function (for example, to reinforce the housing, to partition a space in the housing, to hold a member such as an electronic component in the housing, etc.) is integrally formed. When it has, the member for ground connection may contact | abut to those function parts (namely, a part of housing | casing).

  Further, the shape of the ground connection member is not limited to the shape of the above embodiment, and at least a part of the ground connection member is joined to the ground region of the circuit board by soldering, and the ground connection When the circuit board to which the working member is bonded is housed in the housing, the remaining part of the ground connection member may be brought into contact with the housing. In addition, the ground connection member may be elastically deformable or plastically deformed as a whole, or a part of the housing contact portion or the intermediate connecting portion may be elastically deformable or plastically deformable. In addition, the ground connection member is not limited to the configuration in which the tip of the housing contact portion (each partial contact) contacts the housing, and the housing contact portion (each partial contact) is bent or curved in the middle. The bent portion or the curved portion may be brought into contact with the housing. The present invention is not limited to a DVD player, and can be applied to any electronic device as long as it is an electronic device that houses a circuit board in a housing, such as a projector or a printer.

1 is a perspective view showing an overall configuration of a DVD player according to an embodiment of the present invention. (A) is the fractured perspective view which expands and shows the principal part structure of the DVD player, (b) is the sectional view. The perspective view of the member for ground connection of the DVD player. The side view when the member for ground connection of the DVD player is joined to a circuit board. (A) (b) (c) is sectional drawing which shows the assembly method of the DVD player. The fractured perspective view which shows the structure of the conventional electronic device.

1 DVD player (electronic equipment)
DESCRIPTION OF SYMBOLS 2 Housing | casing 3 DVD insertion slot 4 Operation switch 5 Liquid crystal display part 6 Circuit board 6a Edge of the rear side of a circuit board 7 Board holder 8 Ground connection member 21 Front panel 22 Top panel 23 Under panel 24 Rear panel 24a Upper wall part of rear panel 24b Rear panel side wall 24c Edge of upper panel of rear panel 61 Insulating substrate 62 Ground region 81 Substrate joint 82 Housing contact portion 82a Partial contact 82b Notch 83 Intermediate joint 89 Solder

Claims (3)

In an electronic apparatus comprising a circuit board on which electronic components are mounted, and a metal housing that houses the circuit board,
A ground connection member having conductivity for electrically connecting the ground region of the circuit board and the housing;
The ground connection member includes a board joint portion that is soldered and joined to a ground region of the circuit board, and a housing contact portion that contacts the housing.
An electronic device characterized by that. The housing is in a state of pressing the housing contact portion of the ground connection member when the circuit board is stored,
The housing contact portion of the ground connection member is pressed by the housing and is in contact with the housing.
The electronic device according to claim 1. The housing contact portion of the ground connection member has a plurality of partial contact members that can be independently deformed and can be contacted independently with the housing,
The electronic device according to claim 2.

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