JP2008146920A - Ground connection structure and electronic equipment equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground connection structure capable of suppressing an effect on the wiring pattern of a printed wiring board and the mounting position of an electronic equipment. <P>SOLUTION: An AV device 1 has the ground connection structure 21 equipped with a printed wiring board 23 and a spring 24. A grounding pattern 28 in contact with the plating layer 17 of a decorated member 15 is formed on one surface 25a of the printed wiring board 23, and a second grounding pattern 29 connected with the grounding pattern 28 is formed on another surface 25b of the printed board. The spring 24 is fitted to a chassis 14 in its one end, and is brought into an elastic contact with the second ground pattern 29 in its another end. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides, for example, an earth connection structure for connecting an exterior part having at least an outer surface made of metal to which operation buttons of various electronic devices such as AV equipment are attached and a chassis of the electronic device, and the earth connection structure. The present invention relates to an electronic device including

  For example, various AV devices have been conventionally used as electronic devices that read and reproduce information recorded on an optical disc such as a CD (Compact Disk). Conventional AV devices include a device main body, a playback unit that is housed in the device main body and clamps an optical disk such as a CD to read information from the optical disk, and is provided on the surface of the device main body and performs various operations. And an operation unit used for performing the operation.

  The operation unit described above includes an exterior component attached to an apparatus body whose metal is plated on the outer surface, an operation button provided on the exterior component, and the like. The above-described exterior component imparts a high-class feeling to the AV equipment by plating metal on the outer surface.

  In order to release the static electricity charged in the above-described exterior component to the outside, the conventional AV equipment includes the ground connection structure 100 shown in FIG. The ground connection structure 100 shown in FIG. 1 electrically connects an exterior component 102 attached to an outer case 101 made of a synthetic resin for AV equipment and a conductive chassis 103 housed in the outer case 101. And the above-described static electricity is guided to a vehicle body such as an automobile through the chassis 103.

  The ground connection structure 100 includes a hole 105 provided in a printed wiring board 104 disposed between the exterior component 102 and the chassis 103, and a leaf spring 106 as an elastic connection component attached to the chassis 103. Yes. Of course, the hole 105 penetrates the printed wiring board 104. The leaf spring 106 is made of a conductive metal, has one end fixed to the chassis 103 and the other end passing through the hole 105 and contacting the exterior component 102. The leaf spring 106 is elastically deformed and generates an elastic restoring force whose other end presses the exterior component 102, and is always electrically connected to the exterior component 102.

  In the ground connection structure 100 described above, the leaf spring 106 always electrically connects the exterior component 102 and the chassis 103, and guides static electricity charged in the exterior component 102 to the vehicle body of the automobile via the chassis 103.

  In the conventional ground connection structure 100 described above, the hole 105 provided in the printed wiring board 104 needs to be formed large in order to allow the leaf spring 106 to pass therethrough. For this reason, it is necessary to form the mounting position of the electronic component mounted on the printed wiring board 104 and the wiring pattern of the printed wiring board 104 so as to avoid the hole 105. For this reason, the conventional ground connection structure 100 has a great influence on the wiring pattern of the printed wiring board 104 and the mounting position of the electronic component.

  Accordingly, an object of the present invention is to provide a ground connection structure capable of suppressing an influence on a wiring pattern of a printed wiring board and a mounting position of an electronic component, for example.

  In order to solve the above-described problems and achieve the object, the ground connection structure of the present invention according to claim 1 is an exterior component that is exposed to the outside of an electronic device and has at least an outer surface made of metal, and the electronic device. In a ground connection structure for connecting a conductive chassis housed in a device, a ground pattern provided between the exterior component and the chassis and electrically connected to the exterior component is relative to the exterior component. A printed wiring board provided on one surface and electrically connected to the ground pattern and a second ground pattern provided on the other surface, and attached to one of the printed wiring board and the chassis. And an elastic connection part that elastically contacts the other and electrically connects the second ground pattern and the chassis.

  Hereinafter, an embodiment of the present invention will be described. The ground connection structure according to one embodiment of the present invention is configured such that an exterior component and a ground pattern on one surface of a printed wiring board are brought into contact with each other, and a second ground pattern provided on the other surface connected to the ground pattern is provided. One of the chassis is provided with an elastic connecting part that contacts the other. By doing so, there is no need to form holes in the printed wiring board through which the elastic connecting parts are passed, and therefore there is no influence on the printed wiring board except that a ground pattern is provided on the printed wiring board. Therefore, the influence on the wiring pattern of a printed wiring board and the mounting position of an electronic component can be suppressed.

  An elastic connection component may be attached to the chassis and in elastic contact with the second ground pattern. In this case, since it is sufficient to provide the second ground pattern only at the place where the elastic connection component contacts, the influence on the printed wiring board can be surely suppressed, and the influence on the wiring pattern of the printed wiring board and the mounting position of the electronic component. Can be reliably suppressed.

  You may provide the protrusion rib which protruded from at least one among exterior components and one surface. In this case, since the contact area between the exterior component and the printed wiring board can be suppressed, the area of the ground pattern can be suppressed as well as the influence on the wiring pattern of the printed wiring board and the mounting position of the electronic component more reliably. Can do.

  An electronic device having the above-described ground connection structure may be used. In this case, the influence on the wiring pattern of a printed wiring board and the mounting position of an electronic component can be suppressed.

  An embodiment of the present invention will be described with reference to FIGS. An AV (Audio-Visual) device 1 as an electronic device according to an embodiment of the present invention is mounted on an instrument panel (hereinafter referred to as an instrument panel) of a car as a moving body. Hereinafter, an arrow Y that is parallel to the surface of a CD or MD, which will be described later, and parallel to the direction in which the CD or MD is inserted or removed is referred to as a depth direction, and is parallel to the surface of the CD or MD and perpendicular to the depth direction Y The arrow X is called the width direction, and the arrow Z orthogonal to both the depth direction Y and the width direction X is called the thickness direction.

  As shown in FIG. 2, the AV device 1 includes a device main body 2, a CD (Compact Disk) player 3 as a playback device, an MD (Mini disc) player 4 as a playback device, and an AM / An FM tuner 5, a display unit 6, an operation unit 7, and a ground connection structure 21 (shown in FIG. 3 and hereinafter simply referred to as a connection structure) are provided.

  The device body 2 is formed in a box shape and attached to the instrument panel described above. The device body 2 includes an outer case 13 that forms an outer shell and is made of an insulating synthetic resin, and a chassis 14 that is housed in the outer case 13 and is made of a conductive sheet metal (shown in FIG. 3). ). When the chassis 14 is attached to the instrument panel, it is electrically connected to the body of the automobile. The chassis 14 is subjected to a well-known chromate treatment, and a rust preventive film is formed on the outer surface.

  A CD insertion slot 8 and an MD insertion slot 9 are opened on one surface 13a (hereinafter referred to as the front surface) of the outer case 13 of the device body 2 located on the front side in FIG. The front surface 13a is a surface that is exposed to the outside and faces an occupant (also referred to as a user) when the device main body 2 is attached to the instrument panel. The CD insertion slot 8 passes the CD inside, and inserts and removes the CD into and from the apparatus main body 2, that is, the CD player 3. The MD insertion port 9 passes the MD inwardly, and inserts and removes the MD into and from the apparatus main body 2, that is, the MD player 4.

  The CD player 3 reads information on the CD inserted into the device main body 2 and outputs it as sound. The MD player 4 reads the information on the MD inserted into the device body 2 and outputs it as sound. The AM / FM tuner 5 receives a radio broadcast and outputs it as sound. The players 3 and 4 and the tuner 5 operate when a user presses a push button 11 or the like, which will be described later, provided on the operation unit 7.

  The display unit 6 includes a display panel 10 that displays information including a fluorescent display tube attached to the front surface 13a. The display unit 6 displays on the display panel 10 information such as the CD or MD program being played and the name of the broadcasting station being received by the tuner 5.

  The operation unit 7 includes one composite switch 12 and a plurality of push buttons 11. The composite switch 12 is attached to a decorative part 15 (shown in FIG. 3) as an exterior part attached to the front surface 13a. As shown in FIG. 4, the decorative part 15 has a plating layer 17 made of a conductive metal on the outer surface of a base material 16 made of an insulating synthetic resin. For this reason, at least the outer surface of the decorative part 15 is made of metal.

  The decorative part 15 includes a disc-shaped bottom plate portion 18 and a cylindrical tube portion 19 standing from the outer edge of the bottom plate portion 18 and is formed in a bottomed cylindrical shape. The decorative part 15 is attached to the device main body 2 so that the bottom plate portion 18 is parallel to the front surface 13a and the edge of the tube portion 19 away from the bottom plate portion 18 is connected to the front surface 13a, and is exposed to the outside of the AV device 1. ing.

  The composite switch 12 includes an operation knob 20 that is provided so as to be movable along a direction orthogonal to the front surface 13a and is rotatably supported around an axis that is orthogonal to the front surface 13a. The operation knob 20 is urged in a direction protruding from the front surface 13a, and is restricted from falling off the front surface 13a by being locked to the front surface 13a.

  The composite switch 12 turns on / off the power supply of the entire AV device 1 when the operation knob 20 is pressed, and rotates the operation knob 20 around the axis so that the volume of the program being played or received is Used to adjust.

  The push button 11 is provided so as to protrude and retract from the front surface 13a and is urged in a direction protruding from the front surface 13a. When the push button 11 is pressed, the push button 11 is used to change the program being played back or received, and the various players 3 and 4 and the tuner 5 housed in the device main body 2 are operated.

  As shown in FIG. 3, the connection structure 21 includes a protruding rib 22, a printed wiring board 23, and a leaf spring 24 as an elastic connection component.

  As shown in FIG. 4, the protruding rib 22 is formed integrally with the decorative part 15, and of course, a plating layer 17 is applied to the outer surface together with the decorative part 15. The protruding rib 22 is formed in a columnar shape, and is erected from the bottom plate portion 18 of the decorative part 15 toward the back of the device body 2, that is, toward the printed wiring board 23. In the illustrated example, the protruding rib 22 is erected from the edge of the bottom plate portion 18.

  The printed wiring board 23 is accommodated in the device main body 2. The printed wiring board 23 is disposed near the front surface 13 a and between the decorative component 15 and the chassis 14. The printed wiring board 23 includes an insulating substrate 25, a wiring pattern (not shown) formed on the surface of the substrate 25, and a ground connection portion 26. Both surfaces of the substrate 25 are arranged in parallel with the front surface 13a. Various electronic components 27 and the like are mounted on the substrate 25. The wiring pattern is made of a conductive metal such as copper. The wiring pattern is formed in a foil shape and attached to the surface of the substrate. The wiring pattern electrically connects the above-described electronic components 27 according to a predetermined pattern.

  As shown in FIG. 4, the ground connection portion 26 includes a ground pattern 28, a second ground pattern 29, and a through hole portion 30. The ground pattern 28 and the second ground pattern 29 are made of a conductive metal such as copper and are formed in a foil shape, and are attached to the surfaces 25a and 25b of the substrate 25 in the same manner as the wiring pattern described above. Yes.

  The ground pattern 28 is provided on one surface 25 a of the substrate 25, that is, the printed wiring board 23, facing the decorative component 15 and the protruding rib 22 standing from the decorative component 15. The ground pattern 28 is arranged on the outer surface of the protruding rib 22, that is, the decorative component 15, so as to overlap with the protruding rib 22 along the direction orthogonal to the one surface 25 a of the substrate 25, that is, the printed wiring board 23. The plated layer 17 is electrically connected. In the illustrated example, the distance between the ground pattern 28 and the plating layer 17 on the protruding rib 22 is about 0.1 mm.

  The second ground pattern 29 is provided on the other surface 25 b on the back side of the one surface 25 a of the substrate 25, that is, the printed wiring board 23. The second ground pattern 29 is disposed at a position overlapping the ground pattern 28 along the direction orthogonal to the substrate 25, that is, the surfaces 25 a and 25 b of the printed wiring board 23. Electrically connected.

  The through hole portion 30 includes a plurality of through holes 31 provided at positions overlapping with the protruding ribs 22 of the substrate 25, that is, the printed wiring board 23, and a plating layer 32 provided on the inner surface of the through hole 31. The plating layer 32 has one end electrically connected to the ground pattern 28 and the other end electrically connected to the second ground pattern 29 to electrically connect the ground patterns 28 and 29 to each other. That is, the through-hole portion 30 electrically connects the ground patterns 28 and 29 to each other.

  The leaf spring 24 is made of a sheet metal having elasticity and conductivity and is formed in a strip shape. One end of the leaf spring 24 is fixed to the chassis 14 with a screw 33 or the like, and the other end overlaps with the second earth pattern 29 provided on the printed wiring board 23 to come into contact with the second earth pattern 29. Yes. The leaf spring 24 is elastically deformed so that the other end portion generates an elastic restoring force that presses the second ground pattern 29. Thus, in this invention, it is called elastic contact that it is elastically deforming and contacting in the state which produced the elastic restoring force. Thus, the leaf spring 24 is in elastic contact with the second ground pattern 29 on the printed wiring board 23 to electrically connect the second ground pattern 29 and the chassis 14.

  In the connection structure 21 described above, the ground connection portion 26 electrically connects the second ground pattern 29 and the decorative part 15, and the leaf spring 24 electrically connects the second ground pattern 29 and the chassis 14, Static electricity or the like charged on the decorative part 15 is guided to the body or the like via the chassis 14.

  According to the present embodiment, the AV device 1 is provided on the other surface 25 b connected to the ground pattern 28 by bringing the decorative part 15 into contact with the ground pattern 28 on the one surface 25 a of the printed wiring board 23. A leaf spring 24 that contacts one of the second ground pattern 29 and the chassis 14 is provided. For this reason, since it is not necessary to form a hole through which the leaf spring 24 is passed in the printed wiring board 23, there is no influence on the printed wiring board 23 except that the printed wiring board 23 is provided with the ground patterns 28 and 29. Therefore, the influence on the wiring pattern of the printed wiring board 23 and the mounting position of the electronic component 27 can be suppressed.

  A leaf spring 24 is attached to the chassis 14 and is in elastic contact with the second ground pattern 29. For this reason, since it is sufficient to provide the second ground pattern 29 only at the place where the leaf spring 24 contacts, the influence on the printed wiring board 23 can be reliably suppressed, and the wiring pattern of the printed wiring board 23 and the mounting of the electronic component 27 can be suppressed. The influence on the position can be reliably suppressed.

  In the embodiment described above, the protruding rib 22 protruding from the decorative part 15 is provided. As described above, in the present invention, it is desirable to provide the rib 22 protruding from the decorative part 15. In this case, since the contact area between the decorative component 15 and the printed wiring board 23 can be suppressed, the area of the ground pattern 28 can be suppressed as well as the influence on the wiring pattern of the printed wiring board 23 and the mounting position of the electronic component 27. It can be surely suppressed. In the present invention, the protruding rib 22 may not be provided.

  In the embodiment described above, the leaf spring 24 is attached to the chassis 14. However, in the present invention, as shown in FIG. 5, the screw 33 penetrating the printed wiring board 23 is screwed into the protruding rib 22, and the leaf spring 24 is attached to the printed wiring board 23 to be brought into elastic contact with the chassis 14. good. In FIG. 5, the same parts as those in the above-described embodiment are denoted by the same reference numerals and the description thereof is omitted. Furthermore, in this invention, you may remove the rust preventive film of the location which contacts the leaf | plate spring 24 of the chassis 14. FIG. 5, the leaf spring 24 is fixed by the screw 33. However, the present invention is not limited to this, and the leaf spring 24 may be fixed to the second ground pattern 29 of the printed wiring board 23 by soldering.

  In the embodiment described above, the decorative part 15 is shown as the exterior part. In the present invention, the present invention may be applied not only to the decorative parts but also to parts exposed to the outside of various AV devices 1. In the above-described embodiment, the decorative component 15 has the plating layer 17 formed on the outer surface. However, in the present invention, the exterior component may be a solid material made of metal.

  In the above-described embodiment, the leaf spring 24 is used as the elastic connection part. However, in the present invention, not only the leaf spring 24 but also various articles (such as a spring) may be used as long as they are in elastic contact.

  Further, in the above-described embodiment, the AV device 1 attached to a car as an electronic device is shown. However, the present invention is not limited to the AV device 1 and may be applied to various electronic devices.

  According to the embodiment described above, the following ground connection structure 21 is obtained.

(Supplementary Note) In the ground connection structure 21 that connects the decorative part 15 exposed to the outside of the AV device 1 and having at least an outer surface made of metal, and the conductive chassis 14 accommodated in the AV device 1,
A ground pattern 28 provided between the decorative component 15 and the chassis 14 and electrically connected to the decorative component 15 is provided on one surface 25a facing the decorative component 15 and the ground pattern 28 A printed wiring board 23 electrically connected to the second ground pattern 29 provided on the other surface 25b;
A leaf spring 24 attached to one of the printed wiring board 23 and the chassis 14 and elastically contacting the other to electrically connect the second ground pattern 29 and the chassis 14; The earth connection structure 21 characterized by this.

  According to the remark, the second ground pattern 29 provided on the other surface 25b connected to the ground pattern 28 and the chassis are brought into contact with the decorative part 15 and the ground pattern 28 on the one surface 25a of the printed wiring board 23. 14 is provided with a leaf spring 24 in contact with the other. For this reason, since it is not necessary to form a hole through which the leaf spring 24 is passed in the printed wiring board 23, there is no influence on the printed wiring board 23 except that the printed wiring board 23 is provided with the ground patterns 28 and 29. Therefore, the influence on the wiring pattern of the printed wiring board 23 and the mounting position of the electronic component 27 can be suppressed.

  In addition, the Example mentioned above only showed the typical form of this invention, and this invention is not limited to an Example. That is, various modifications can be made without departing from the scope of the present invention.

It is sectional drawing which shows the conventional earth connection structure. It is a perspective view which shows AV equipment provided with the earth connection structure concerning one Example of this invention. It is sectional drawing which shows the earth connection structure of the AV apparatus shown by FIG. It is sectional drawing which expands and shows the principal part in FIG. It is sectional drawing which shows the modification of the earth connection structure shown by FIG.

Explanation of symbols

1 AV equipment 14 Chassis 15 Cosmetic parts (exterior parts)
21 Ground connection structure 22 Protruding rib 23 Printed wiring board 24 Leaf spring (elastic connection component)
25a One surface 25b The other surface 28 Ground pattern 29 Second ground pattern

Claims (4)

In an earth connection structure that connects an exterior part that is exposed to the outside of an electronic device and at least an outer surface is made of metal, and a conductive chassis housed in the electronic device,
An earth pattern provided between the exterior component and the chassis and electrically connected to the exterior component is provided on one surface facing the exterior component and provided on the other surface of the ground pattern. A printed wiring board electrically connected to the second ground pattern;
An elastic connection part attached to one of the printed wiring board and the chassis and elastically contacting the other to electrically connect the second ground pattern and the chassis. Ground connection structure.   The ground connection structure according to claim 1, wherein the elastic connection component is attached to the chassis and is in elastic contact with the second ground pattern.   The ground connection structure according to claim 2, wherein a projecting rib projecting from the exterior part is provided.   An electronic apparatus comprising the ground connection structure according to any one of claims 1 to 3.

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