JP2002368436A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device of preventing an electronic circuit from being charged to protect the circuit, by externally discharging a static electricity charged at a sheathing case mounted on a front surface of an electronic device body out of the device in the device such as a car audio system or the like. SOLUTION: The electronic device comprises a ground 50 on a printed board 100 (circuit board) of a panel 1 having a decorative part 30. A support 14 of the front surface panel 20 and a control button 10 (control section) of the panel 1 is clamped by using a screw 40 (conductive member). In this case, a head of the screw 40 is contacted with the ground 50, and a base end of the screw 40 is clamped to contact with the decorative part 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device.

[0002]

2. Description of the Related Art Generally, the structure of electronic equipment such as audio equipment is such that a printed circuit board having various electronic components such as IC sockets and capacitors mounted on the surface of the board is fixed in the electronic equipment, and a display unit or the like is mounted on the surface. A panel on which operation buttons are arranged is mounted.

As shown in FIG. 5, there is a case where a decorative panel 30a plated with a decoration is provided on the surface of the panel 20a, and its end is fixed to the panel 20a by welding. I have. The surface of the operation button 10a may be similarly plated. When the decorative panel 30a and the operation button 10a are plated, static electricity is easily charged, and when the space of the panel 1 is narrow, the static electricity is fixed to one end of the operation button 10a by connecting a screw on a rear surface of the panel 20a. Conduction through the terminal 40a may adversely affect various electronic components on the printed circuit board 100a.

Therefore, as a method of preventing static electricity from being charged, a method of grounding a chassis by a pattern circuit on a printed circuit board of a car stereo main body connected to each connection terminal of a panel has conventionally been adopted.

[0005]

However, recently, portability has been pursued in terms of weight reduction and cost of electronic devices, and at the same time, the structure has been reduced in size, and a sufficient insulation distance between the panel portion and the printed circuit board has been required. In some cases, it is not possible to secure the number of parts, and in such a case, the number of parts must be omitted altogether, and the method of grounding with a complicated configuration as described above has become impossible.

An object of the present invention is to rationally ground static electricity charged on a decorative panel in an electronic device.

[0007]

According to a first aspect of the present invention, there is provided an electronic device having a plated body on a device body including a circuit board on which electronic components are mounted. Wherein the circuit board is provided with a ground portion connected to ground, the panel is provided with a plated operation portion, and the panel and the operation portion are connected to the ground portion, and the operation is performed. The part is fixed to the panel by a conductive member.

According to a second aspect of the present invention, in the electronic apparatus according to the first aspect, one end of the conductive member is in contact with the panel, and the other end of the conductive member is the ground. Contacting the part.

The invention described in claim 3 is the first or second invention.
3. The electronic device according to claim 1, wherein the conductive member is a screw.

According to a fourth aspect of the present invention, in the electronic device according to the first aspect, a recess surrounding the head of the screw is formed in the operation unit, and a peripheral end surface of the recess is applied to the circuit board. It is characterized by contact.

According to a fifth aspect of the present invention, there is provided the electronic device according to any one of the first to fourth aspects, wherein a hole is provided on the circuit board so as to penetrate the screw, and is opposite to a panel on the circuit board. A metal plate is provided on the side surface, and the head of the screw is connected to the metal plate.

[0012]

FIG. 1 shows a car audio as an example of an electronic apparatus A. The electronic device A includes a device main body 2 and a panel 1 attached to the front of the device main body 2. The panel 1 has an insertion slot 3 for inserting a cassette or the like, an operation button 10 for adjusting and changing a sound and a channel, and A display unit 4 and the like for displaying a volume and a channel number are provided and mounted on a panel frame 5 of the device main body 2. In this example, a description will be given mainly of a panel 1 attached to the front surface of a device main body 2 of the electronic device A, and the description will be made separately for the first embodiment and the second embodiment.

[First Embodiment] FIG. 2 is a sectional view showing one side of a panel 1 mounted on the front of an electronic device A. The panel 1 includes a printed board 100 (circuit board) provided on the back of the panel 1 and a printed board 10
The tact switch 150 is provided as an example of a switch arranged on the “0”, and the operation button 10 (operation unit) for operating the tact switch 150 from outside is provided. In addition, an IC (not shown)
Electrical components such as sockets and capacitors are mounted.
Here, the electronic device A includes, for example, any electronic device A in which electronic components are incorporated, such as audio, video, television, facsimile, computer, and peripheral devices.
Is included.

The panel 1 includes a resin front panel 20 provided to cover the front side of the printed circuit board 100;
The decorative portion 30 attached to the surface of the front panel 20
And a plug 2 for attaching the panel 1 to the device body 2
5 is provided. Further, the front panel 20 is provided with a plurality of openings 15 for attaching the operation buttons 10.

A ground 50 is provided on the printed circuit board 100. In this embodiment, a thin conductive film is formed on the printed circuit board 100. The printed circuit board 1
The material of the conductive film formed by printing on the surface may be a conductive material. For example, when a conductive film is formed by carbon, inexpensive and high-quality material is continuously produced by a screen printing method or the like. Needless to say, the method of forming the conductive metal thin film layer is not limited to the printing method, and the conductive metal thin film layer may be provided by a vapor deposition method or the like as needed. Further, instead of the conductive film, a material constituted by a projecting piece or the like may be used.

The operation button 10 includes a pressing portion 12 that can be pressed from the outside, a hinge portion 12 that supports the operation button 10 in a resilient state, a tact boss 13 that presses a tact switch 150, and one end of the operation button 10. Panel 1
And a support portion 14 for fixing the front portion 20 to the front panel 20. The operation button 10 is a synthetic resin part obtained by integrally molding the above-mentioned parts, and the surface thereof is plated so that the parts are electrically connected to each other. In this embodiment, the support portion 14 of one operation button 10 is fixed to the front panel 20 with a screw 40 (conductive member) described later. And a method of fixing one end of the connecting member with a screw 40 described later.

FIG. 3 is an enlarged view of the vicinity of the end of the panel 1. The decorative portion 30 attached to the surface of the front panel 20 of the panel 1 and the support portion 14 of the operation button 10 are connected to the front panel via screws 40. FIG.

The makeup section 30 includes a front panel 20 of the panel 1.
Attached to. The decorative portion 30 is provided along the longitudinal direction of the front panel 20 and has a flat surface. As shown in FIG. 3, the decorative portion 30 includes a first thin portion 30 a along the inclined portion on the end side of the front panel 20, and a second thin portion 30 b provided by bending the first thin portion 30 a. A hook-shaped downward (toward the printed circuit board) engaging projection 30c is provided from the second thin portion 30b. The makeup section 30 has a first thin portion 30a on the back surface.
, A second thin portion 30b, and a substantially trapezoidal groove 31 surrounded by three sides of the engaging projection 30c. The groove 31 engages with the convex portion 22 of the front panel 20 to form the decorative portion 30. Is attached to the front panel 20.

The front panel 20 provided with the decorative section 30 includes:
The support portion 14 of the operation button 10 is fixed, and the operation button 1
Boss 16 on the printed circuit board 100 side
(Recess).

A recess 17 is formed in the boss 16, and a screw hole 19 through which a screw 40 is inserted is formed in the bottom 18 of the recess 17. The boss 16 is attached in a state where the peripheral end surface of the boss 16 is in contact with the printed circuit board 100. Thus, the head 40 of the screw 40
a is hidden in the recess 17 of the boss 16, the static electricity generated in the makeup section 30 and the operation button 10 is
The zero head 40a is reliably discharged to the ground 50, and the discharge of static electricity to the mounting portion of the printed circuit board 100 other than the ground 50 can be prevented.

The front panel 20 has a screw hole 1 in the support portion 14.
A screw hole 21 is formed at a position corresponding to 9. A screw groove is formed in the screw hole 21, and the position of the screw hole 21 of the front panel 20 and the screw hole 19 of the support portion 14 are formed.
And screw 40 to printed board 1 of boss 16
By screwing the screw 40 from the 00 side, the operation button 10
Are fixed to the front panel 20. In this case, the head 40a of the screw 40 contacts the ground 50, and the base end 40b of the screw 40 contacts the engaging projection 30c of the decorative portion 30.

In this embodiment, the head 40a of the screw 40 has been described as being grounded to the ground 50. However, if the static electricity flowing into the head 40a of the screw 40 can be discharged to the ground 50, the ground 50 and the screw 40 Head 40a need not be grounded and may have a slight gap.

Further, a screw hole (not shown) may be provided in the decorative portion 30, and the decorative portion 30 may be fixed by the screw 40. In this case, as described above, the screw 40 is inserted through the screw holes 19 and 21 of the front panel 20 and the operation button 10, and the base end portion 40 b of the screw 40 is formed on the decorative portion 30. By being screwed into the hole, static electricity generated in the decorative portion 30 can be reliably conducted to the screw 40. In this case, since the decorative portion 30 is fixed to the front panel 20 with the screws 40, by loosening the screws 40,
The makeup section 30 can be easily removed from the panel 1.

As described above, by using the screw 40, there is no need to install a complicated ground, and the panel 1
It is possible to reduce the ratio of the space occupied inside the device. Further, by integrally fixing the makeup unit 30 and the operation button 10 with the screw 40, the internal configuration of the panel 1 can be simplified, and a design advantageous in terms of cost and the like can be performed. .

Next, the flow of static electricity when the operation button 10 is operated will be described. Usually, as shown in FIG.
The pressing portion 11 of the operation button 10 and the tact switch 150 on the printed circuit board 100 are separated from each other.
When the pressing portion 11 of the operation button 10 is pressed from this state, the hinge portion 20 is elastically deformed. Then, due to the elastic deformation of the hinge portion 20, the pressing portion 11 and the tact boss 13 rotate integrally about the support portion 14 of the operation button 10, and the tact boss 13 presses the tact switch 150 with this rotation. As a result, the conduction state and the non-conduction state of the tact switch 150 are switched.

At this time, the tact boss 13 and the tact switch 150 come into contact with each other.
In the conventional operation button 10, there is a possibility that static electricity may be discharged from the tact boss 13 to the tact switch 150. However, in the case of the operation button 10, as described above, the operation button 10 itself is connected to the ground on the printed circuit board 100. Since it is in a conductive state with 50, tact boss 1
There is no fear that static electricity is discharged from the third to the tact switch 150.

That is, in the electronic device A of this embodiment, the conductive makeup section 30 and the operation button 10 are
By attaching the decorative portion 30 and the operation button 10 to the ground 50 by integrally attaching with the screw 40, the printed circuit board 100 and the decorative portion 30 are positively discharged.
Alternatively, static electricity is prevented from being conducted between the operation button 10. For this reason, for example, the makeup unit 3
0, even when any one of the operation buttons 10 is charged with static electricity, the static electricity flows to the ground 50 on the printed circuit board 100 via the screw 40, so that No static electricity is conducted.

By adopting such a configuration for preventing the electrification of static electricity, current can be prevented from conducting to the printed circuit board 100 provided behind the front panel 20. It is possible to prevent the malfunction of the control device or the like of the electronic device A due to the static electricity charged on the operation button 10.

In the first embodiment, the operation button 10 is made of a resin component whose surface is plated. However, if the operation button 10 can be electrically conductive, for example, it is formed of metal or an electrically conductive material. It may be formed of a resin having properties.

Further, in this embodiment, the case where the decorative portion 30 is provided near the end of the front panel 20 has been described. A ground is provided on a portion of the substrate 100 located on the back surface of the decorative portion 30, and the support portion 14 of the operation button 10 is provided on the back surface of the decorative portion 30 and fixed using screws 40 in the manner described above.

[Second Embodiment] An electronic device A according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, a metal panel 200 (metal plate) is provided behind the printed circuit board 100, and a hole 70 is provided on the printed circuit board 100. It discharges static electricity charged on the button 10. Note that, except for the parts specific to the second embodiment, the configuration is the same as that of the first embodiment. In the second embodiment, the first
The same reference numerals are given to the same portions as those of the embodiment, and the description thereof will be omitted.

The electronic device A of the second embodiment has a flat metal panel 200 on the back of a printed circuit board 100. The metal panel 200 is disposed on the printed circuit board 100, and is further fixed to a side surface of the electronic device A body with screws. This metal panel 200
Is only required to have electrical conductivity, and may be, for example, a conductive plastic plate. Further, the printed circuit board 100 is provided with a hole 70 through which a ground wire 60 to be described later is inserted from the support portion 14 of the operation button 10. This hole 70 is formed to be larger than the cutting radius of the ground wire 60.

The ground wire 60 is inserted through the hole 70 from the tip of the support portion 14 of the operation button 10, and
0 is projected to the metal panel 50. The ground wire 60 is made of, for example, a copper wire or an enamel wire, and portions other than both ends of the ground wire 60 are covered with an insulator (not shown). Thereby, the ground wire 60
Thus, static electricity can be prevented from being discharged to the mounting portion on the printed circuit board 100.

One end of the ground wire 60 is connected to the metal panel 200 behind the printed circuit board 100. As a connection method, for example, the end of the ground wire 60 is fixed to the metal panel 200 by soldering. . As another method, a screw (not shown) is fixed on the metal panel 200,
By winding the end of the ground wire 60 around the screw, the ground wire 60 and the metal panel 200 are made conductive. In this case, the contact state between the tip of the ground wire 60 and the metal panel 200 can be further ensured. Further, the bonding strength between the ground wire 60 and the metal panel 200 can be increased.

On the other hand, the other end of the ground wire 60 is wound around a screw 40 attached to the boss 16 of the operation button 10. The connection method between the end of the ground wire 60 and the screw 40 may be other than the above method, and may be attached by, for example, soldering.

In the above-described first embodiment, the screw 40 for fixing the operation button 10 is in contact with the ground 50 on the printed circuit board 100, whereas in the second embodiment, the screw 40 is 40 penetrates the hole 70 of the printed circuit board 100 and comes into contact with a metal panel 200 provided on the back surface of the printed circuit board 100. For this reason, the decorative portion 30 and the operation buttons 10 can be brought into conduction with the metal panel 200 without passing through the printed circuit board 100, whereby the conduction state between the panel 1 on the printed circuit board 100 and the metal panel 200 can be established. Reliability can be further improved. Accordingly, it is possible to reliably prevent the makeup section 30 and the operation button 10 from being charged with static electricity.

In the present embodiment, the printed circuit board 1 is used as an alternative to the ground 50 of the first embodiment.
Although the metal panel 200 arranged on the back surface of the 00 is illustrated, the configuration may be arranged at other positions.
For example, the ground wire 60 may be connected to a chassis (not shown) of the electronic device A.

The means for attaching the operation button 10 to the electronic device A is also optional.
Needless to say, the details of the specific mounting structure 0 can be appropriately changed.

In each of the above embodiments,
Although the car audio is described as an example of the electronic device A including the printed circuit board 100, the present invention is not limited to this, and may be an electronic device such as a mobile phone.

[0040]

According to the present invention, since the panel is in contact with the ground portion of the circuit board, static electricity charged on the plated panel can be reasonably grounded.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an electronic device of the present invention.

FIG. 2 is a vertical sectional view showing the first embodiment of the panel of the electronic apparatus of the present invention.

FIG. 3 is a vertical sectional view showing a connection portion between an operation button on a panel of the electronic device of the present invention and a front panel.

FIG. 4 is a vertical sectional view showing a second embodiment of the panel of the electronic apparatus of the present invention.

FIG. 5 is a vertical sectional view of a panel of an electronic device according to a conventional example.

[Explanation of symbols]

Reference Signs List A electronic device 1 panel 10 operation button (operation unit) 11 pressing unit 12 hinge unit 13 tact boss 14 support unit 15 opening 20 front panel 30 decorative unit 40 screw (conductive member) 50 ground 60 ground wire 70 hole 100 printed circuit board 150 Tact switch 200 metal plate (metal plate)

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 4E353 AA02 BB03 CC02 CC12 CC13 CC32 DD01 DD14 DR08 DR13 DR49 DR57 EE13 GG02 4E360 AB04 EA03 EA13 ED02 ED03 EE12 GA32 GB11 GB26 GC02 5G019 CP14 LL02 LL10 LL14 G01A45 DA05

Claims (5)

[Claims] 1. An electronic device comprising: a device body containing a circuit board on which electronic components are mounted; and a plated panel, wherein the circuit board is provided with a ground portion connected to ground. An electronic device characterized in that a plated operation part is assembled to the panel, the panel and the operation part are connected to the ground part, and the operation part is fixed to the panel with a conductive member. machine. 2. The electronic device according to claim 1, wherein one end of the conductive member is in contact with the panel, and the other end of the conductive member is in contact with the ground. Electronic equipment characterized by the above. 3. The electronic device according to claim 1, wherein said conductive member is a screw. 4. The electronic device according to claim 1, wherein a recess surrounding the head of the screw is formed in the operation portion, and a peripheral end surface of the recess is in contact with the circuit board. Electronic equipment. 5. The electronic device according to claim 1, wherein a hole through which the screw is provided is provided on the circuit board, and a metal plate is provided on a surface of the circuit board opposite to the panel. An electronic device, wherein a head of the screw is connected to a metal plate.