JP2006073268A - Switch mechanism of electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch of an electronic apparatus capable of preventing static from striking a switching member from the outside even if a material of an exterior part is nonconductive. <P>SOLUTION: A dial type switch mechanism of a digital camera is provided with: a shaft hole part 9 formed in an exterior part 2 of a digital camera body; an operation member 1 having a shaft journaled to the shaft hole part 9 of the exterior part 2; and a metallic brush 5 screwed to a tip of the operation member 1 in the inside of the exterior part 2. The exterior part 2 is provided with an annular groove part 10 coaxially with the shaft hole part 9 on its outside surface; and the operation member 1 is provided with an annular rib 7 fitted to the annular groove part 10 on its back surface. The exterior part 2 is provided with six small holes 11 in the bottom part of the groove part 10. In a corresponding part of the small holes 11, an earth plate 3 is disposed between the exterior part 2 and the brush 5; and an insulating member 4 is disposed between the earth plate 3 and the brush 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a switch mechanism of an electronic device.

  A switch of an electronic device such as a digital camera includes an operation member attached to an exterior portion and a metal switching member interlocked with the operation member. In this case, static electricity may fall on the circuit board and the metal switching member of the operation member from the gap between the exterior portion and the operation member, causing malfunction and damage to the circuit board.

When the exterior part is made of a metal or a conductive member, static electricity flows to the exterior part, so it may be configured to connect the exterior part to GND. However, in recent years, the degree of freedom in design, designability, and cost If a non-conductive plastic member that is used extensively on the surface is used for the exterior part, static electricity does not flow to the exterior part. We take measures against static electricity such as sticking metal plates inside and connecting them to GND, providing sufficient creepage distance for non-conductive parts, and installing electrical products such as fuses on the circuit board to prevent damage. (For example, refer to Patent Document 1).
JP 2002-19639 A

  However, painting conductive materials and disposing electrical parts such as fuses are disadvantageous in terms of cost, and the method of sticking a metal plate inside the vicinity of the opening of the exterior part is metal switching linked to the back of the operating member and the operating part. In the case of a device configured to switch a member directly in contact with a circuit board pattern, there is a problem that a metal plate for countermeasures against static electricity contacts the metal switching member and short-circuits.

  In addition, the method of taking a sufficient creepage distance is not suitable for a small electronic device, and when the electronic device is small, as described below, it is not possible to reliably prevent static electricity from falling on the metal switching member. Absent.

  FIG. 6 is a longitudinal sectional view of a switch mechanism of a conventional electronic device.

  In FIG. 6, a shaft hole portion 9 provided in the exterior portion 2 of the digital camera body, an operation member 1 whose shaft is rotatably fitted in the shaft hole portion 9 of the exterior portion 2, and the exterior portion 2 And a metal brush 5 screwed to the shaft of the operation member 1 on the inner side. The exterior portion 2 that pivotally supports the shaft of the operation member 1 through the shaft hole portion 9 is provided with an annular groove portion 10 coaxially with the shaft hole portion 2 on the outer surface thereof, and the operation portion 1 has a back surface on the back surface thereof. An annular rib 7 that fits into the annular groove 10 is provided on the back surface of the operation member 1. Thereby, while suppressing the backlash with respect to the exterior part 2 of the operation member 1, a creepage distance is earned. However, when the radius d and the axial length of the operation member 1 are reduced by downsizing the device, the creepage distance is insufficient even if the device has a groove or a rib, and static electricity is brushed from the gap between the operation member 1 and the exterior portion 2. 5 (path aa).

  An object of the present invention is to provide a switch for an electronic device that can prevent static electricity from falling on a switching member from the outside even if the material of the exterior portion is non-conductive.

  In order to achieve the above object, the switch mechanism according to claim 1 is provided with a shaft hole provided in an exterior part, an operation member fitted in the shaft hole part, and the operation member inside the exterior part. In a switching mechanism of an electronic device comprising a fixed switching member, at least one small hole provided in the exterior part in the vicinity of the shaft hole part, and inside the exterior part at a position opposed to the small hole and the switching member A conductive member disposed on the outer side of the first conductive member; and an insulating member disposed between the conductive member and the switching member.

  The switch mechanism according to a second aspect is the switch mechanism according to the first aspect, wherein the conductive member is rotatably fitted in the shaft hole portion, and the small hole is disposed at a position facing the operation member. It is characterized by.

  The switch mechanism according to a third aspect is the switch mechanism according to the second aspect, wherein the conductive member protrudes toward the operation member in the small hole.

  The switch mechanism according to claim 4 is the switch mechanism according to any one of claims 1 to 3, wherein the exterior portion has an annular groove portion coaxial with the shaft hole portion, and the small hole includes the It is characterized by opening at the bottom of the annular groove.

  According to the switch mechanism of claim 1, the conductive member is disposed inside the exterior portion and outside the switching member at a position facing at least one small hole provided in the exterior portion in the vicinity of the shaft hole portion, and In addition, since the insulating member is disposed between the conductive member and the switching member, even if the material of the exterior part is non-conductive, static electricity can be applied to the switching member from the gap between the exterior part and the operation member. Can be prevented.

  According to the switch mechanism of the second aspect, the operation member is rotatably fitted in the shaft hole portion, and the small hole is arranged at a position facing the operation member. By dropping the static electricity on the conductive member, it is possible to reliably prevent the static electricity from falling on the switching member.

  According to the switch mechanism of the third aspect, since the conductive member protrudes toward the operation member in the small hole, the static electricity from the gap between the exterior portion and the operation member is reliably dropped on the conductive member. It is possible to more reliably prevent static electricity from falling on the switching member from the gap between the exterior portion and the operation member.

  According to the switch mechanism of the fourth aspect, the exterior portion has the annular groove portion coaxial with the shaft hole portion, and the hole opens on the bottom surface of the annular groove portion, so that the small hole can be easily arranged. it can.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a partial cross-sectional view of a switch mechanism of an electronic device according to an embodiment of the present invention, and FIG. 2 is a partially exploded perspective view of the switch mechanism of the electronic device of FIG.

  In FIG. 1, the dial switch mechanism of the digital camera includes a shaft hole portion 9 provided in the exterior portion 2 of the digital camera body, and a shaft that is pivotally supported (rotatably fitted into the shaft hole portion 9 of the exterior portion 2. And an operation member 1 for operating a dial switch by a user, and a metal brush 5 (switching member) screwed to the operation member 1 inside the exterior portion 2. The brush 5 rotates in conjunction with the operation member 1. The brush 5 is in contact with the circuit board 6 on which the circuit pattern is formed in a form of charging with a spring property, and performs switching of the digital camera body. Moreover, the brush 5 has a slit and provides a click feeling in cooperation with the ball 8 when the operation member 1 is rotated (FIG. 2). And as a countermeasure against static electricity, a ground plate 3 is attached between the brush 5 and the exterior part 2. Further, by providing an insulating member 4 between the ground plate 3 and the brush 5, interference between the ground plate 3 and the brush 5 is prevented, and malfunction or damage of the substrate 6 due to a short circuit is prevented.

  3 is an enlarged view of the switch mechanism of the electronic device of FIG. 1, and FIG. 4 is a longitudinal sectional view of the switch mechanism of the electronic device of FIG.

  3 and 4, the exterior portion 2 that pivotally supports the shaft of the operation member 1 via the shaft hole portion 9 is provided with an annular groove portion 10 coaxially with the shaft hole portion 9 on the outer surface thereof. 1 is provided with an annular rib 7 that fits into the annular groove 10 on the back surface thereof. Thereby, while suppressing the backlash with respect to the exterior part 2 of the operation member 1, a creepage distance is earned. Moreover, six small holes 11 are provided in the exterior part 2 at the bottom of the groove part 10 for countermeasures against static electricity.

  In FIG. 4, the operating member 1 has a brush 5 at the tip of its shaft. In the corresponding portion of the small hole 11, the ground plate 3 is disposed between the exterior portion 2 and the brush 5, and the insulating member 4 is disposed between the ground plate 3 and the brush 5.

  In this case, since the small hole 11 is opened in the exterior portion 2, the path through the external small hole 11 of static electricity is aa, and the path (cc) when the small hole is not opened (FIG. 6) When route aa <route c-c, external static electricity falls to ground plate 3 whose creepage distance is closer than brush 5 (aa), and route aa> route c-c. In this case, as shown in FIG. 5, by extending the ground plate 3 into the small hole 11 and raising the antenna, the creepage distance can be shortened as in the path bb, and static electricity falls on the brush 5. Can be prevented.

  With the above configuration, even if a non-conductive material such as a plastic other than metal is used for the exterior portion 2 and a conductive switch is disposed inside the electronic device body, static electricity falls on the ground plate 3 and the substrate In addition, even when a conductive member such as a metal is used for the switching member, the switching member, the substrate, and the like can be arranged without short-circuiting. The use of plastic or the like for the exterior portion 2 increases the degree of freedom of design and the degree of freedom of design, which is advantageous in terms of cost. In addition, since a static electricity does not fall directly on the substrate by using a ground plate, it is possible to reduce the cost without adding an electronic component such as a fuse.

It is a fragmentary sectional view of the switch mechanism of the electronic device which concerns on embodiment of this invention. FIG. 2 is a partially exploded perspective view of a switch mechanism of the electronic device in FIG. 1. It is an enlarged view of the switch mechanism of the electronic device of FIG. It is a longitudinal cross-sectional view of the switch mechanism of the electronic device of FIG. It is a longitudinal cross-sectional view of the modification of the switch mechanism of the electronic device of FIG. It is a longitudinal cross-sectional view of the switch mechanism of the conventional electronic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Operation member 2 Exterior part 3 Ground plate 4 Insulating member 5 Brush 7 Groove part 9 Shaft hole part 10 Rib 11 Small hole

Claims (4)

In a switch mechanism of an electronic device comprising a shaft hole provided in an exterior part, an operation member fitted into the shaft hole part, and a switching member fixed to the operation member inside the exterior part,
At least one small hole provided in the exterior portion in the vicinity of the shaft hole portion; a conductive member disposed inside the exterior portion and outside the switching member at a position opposed to the small hole; and the conductive member And an insulating member disposed between the switching members.   2. The switch mechanism for an electronic device according to claim 1, wherein the operation member is rotatably fitted in the shaft hole portion, and the small hole is disposed at a position facing the conductive member.   The switch mechanism for an electronic device according to claim 2, wherein the conductive member protrudes toward the operation member in the small hole.   The said exterior part has an annular groove part coaxial with the said axial hole part, and the said small hole is opened in the bottom part of the said annular groove part, The Claim 1 characterized by the above-mentioned. Electronic device switch mechanism.

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