JP2011164117A - Electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital camera in which a button potential can be reduced to a ground potential without impairing the operation feeling of a release button and considering reduction in the strength of a button support part. <P>SOLUTION: The digital camera includes: the release button 102 which is supported to be movable in an axial direction and rotatable by a cover 101; a compression spring 103 which biases the button 102 in a direction opposite to a depressing direction; an FPC 104 on which a switch operated by depressing the button 102 is mounted; and a fixing plate 105 which fixes the FPC 104 to the cover 101. The button 102 includes an engagement part 102C engaged with the cover 101 when the button 102 is rotated, to regulate the movement of the button 102 in the direction opposite to the depressing direction of the button 102, and the fixing plate 105 includes an abutting part 105E abutting on the button 102, when the FPC 104 is fixed to the cover 101, to regulate the rotation of the button 102 and an abutting part 105F coming in electrical contact with the compression spring 103. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electronic device such as a digital camera.

  As a conventional digital camera, a button made of resin with metal plating etc. is brought into electrical contact with the ground pattern of the rear cover, the front cover and the substrate through the button support part and the arm part, so that the potential of the button is grounded. Has been proposed (Patent Document 1). In this proposal, the button is cantilevered by a button support part arranged along the outer periphery of the button, and the button support part is formed of an elastic plate so that the button returns to its original position when the button is pressed. I try to get power.

JP 2004-87220 A

  However, in Patent Document 1, since the button support portion is arranged along the outer peripheral portion of the button to support the button in a cantilevered manner, the strength of the button support portion is likely to decrease due to repeated pressing of the button. The operation feeling when the button is pressed in the axial direction is also poor.

  Therefore, the present invention can reduce the potential of the button member to the ground potential without considering the decrease in strength of the button support portion and without impairing the operational feeling when the button member is pressed in the axial direction. The purpose is to provide a mechanism that can do this.

  In order to achieve the above object, an electronic device according to the present invention includes a cover, a conductive button member that is axially movable and rotatably supported by the cover, and the button member and the cover. A spring member disposed between and for biasing the button member in a direction opposite to the pressing direction of the button member, and a switch operated by pressing the button member are mounted and electrically connected to the ground. And a fixing plate that is electrically connected to the substrate and that fixes the substrate to the cover. The button member engages with the cover when rotated, and the button member An engaging portion that restricts movement in a direction opposite to the pressing direction of the is provided, and the fixing plate has the engaging portion engaged with the cover when the substrate is fixed to the cover. Abut against the button member A first contact portion for regulating a rotation of the tongue member, and a second contact portion for electrical contact with said spring member, characterized in that is provided.

  According to the present invention, the potential of the button member can be lowered to the ground potential without considering the decrease in the strength of the button support portion and without impairing the operational feeling when the button member is pressed in the axial direction. it can.

It is a disassembled perspective view of the principal part of the digital camera which is an example of embodiment of the electronic device of this invention. It is the disassembled perspective view which looked at FIG. 1 from the downward direction. It is an external appearance perspective view of a release button. (A) is the figure which looked at the upper surface part of the front cover from the exterior side, (b) is the figure which looked at the upper surface part of the front cover from the inside side. It is a perspective view of the fixing board for fixing a flexible printed circuit board to a front cover. It is sectional drawing for demonstrating the assembly example of the release button to the recessed part provided in the upper surface part of the front cover. It is sectional drawing for demonstrating the assembly example of the release button to the recessed part provided in the upper surface part of the front cover. It is sectional drawing for demonstrating the assembly example of the release button to the recessed part provided in the upper surface part of the front cover.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of essential parts of a digital camera which is an example of an embodiment of an electronic apparatus according to the present invention, and FIG. 2 is an exploded perspective view of FIG. 1 viewed from below.

  In the digital camera of this embodiment, as shown in FIGS. 1 and 2, a recess 101 </ b> A in which the release button 102 is accommodated via a compression spring 103 is formed on the upper surface portion of the front cover 101.

  The release button 102 has a conductive property such as metal plating applied to the entire resin member, and has a conductivity. The release switch 104A mounted on a flexible printed circuit board (hereinafter referred to as “FPC”) 104 has two stages. In other words, a shooting preparation operation such as a photometry operation or a focus adjustment operation is started by half-pressing the release button 102, and a shooting operation such as exposure to an image sensor such as a CCD by a full-press operation. Here, the release button 102 corresponds to an example of a button member of the present invention.

  The compression spring 103 is disposed between the front cover 101 and the release button 102, and is always in contact with the front cover 101 and the release button 102. Energize in the direction to return to the position. Here, the compression spring 103 corresponds to an example of the spring member of the present invention.

  FIG. 3 is an external perspective view of the release button 102. As shown in FIG. 3, a shaft portion 102 </ b> A for pressing the release switch 104 </ b> A mounted on the FPC 104 is provided at the center of the back surface of the release button 102.

  Around the shaft portion 102A on the back surface of the release button 102, there is a column portion 102E having an arcuate cross section extending along the shaft portion 102A and an engagement portion 102C extending radially outward from the tip end portion of the column portion 102E. A letter-shaped engagement arm 102B is provided.

  The engaging arms 102B are provided at a plurality of locations (two locations in the figure) spaced from each other by approximately 180 ° in the circumferential direction around the shaft portion 102A. Further, an R-shaped chamfered portion 102D is formed on a side portion of the engagement arm 102B facing the clockwise direction when viewed from the front surface side (external side) of the release button 102.

  4A is a view of the upper surface portion of the front cover 101 as viewed from the outside, and FIG. 4B is a view of the upper surface portion of the front cover 101 as viewed from the inside.

  As shown in FIG. 4, a support hole 101 </ b> D that supports the shaft portion 102 </ b> A of the release button 102 so as to be movable in the axial direction and rotatably is provided at the center of the recess 101 </ b> A provided on the upper surface portion of the front cover 101. Is formed.

  An annular groove 101B into which the end of the compression spring 103 is fitted is provided around the support hole 101D of the recess 101A, and an opening for exposing a part of the end of the compression spring 103 is provided in the groove 101B. Part 101C is formed.

  In addition, two through holes 101E for engagement are formed around the groove portion 101B of the recess 101A so as to be approximately 180 ° apart from each other in the circumferential direction corresponding to the engagement arm 102B of the release button 102. The through hole 101E is formed in an arc shape, and has a size that allows the engagement portion 102C disposed at the tip of the engagement arm 102B of the release button 102 to be inserted.

  Further, an engagement hole 101F extending in the counterclockwise direction is formed in communication with the through hole 101E on the side (left side) facing the counterclockwise direction in FIG. 4A close to the inner peripheral side of the through hole 101E. ing. The engagement hole 101F is formed in an arc shape that is narrower than the through hole 101E, and has a size that allows the column portion 102E of the engagement arm 102B to be inserted.

  FIG. 5 is a perspective view of a fixing plate 105 for fixing the FPC 104 to the front cover 101.

  As shown in FIG. 5, a caulking portion 105 </ b> C projects from the fixing plate 105, and the caulking portion 105 </ b> C is inserted into a positioning hole 104 </ b> B (see FIG. 1) formed in the FPC 104 and caulked. Thus, the fixing plate 105 is positioned with respect to the FPC 104.

  The FPC 104 and the fixing plate 105 are fixed in a positioned state via a double-sided tape (not shown) or the like. In such a fixed state, the positions of the screw insertion holes 105A and positioning holes 105B formed in the fixing plate 105 and the screw insertion holes 104C and positioning holes 104D (see FIG. 1) formed in the FPC 104 substantially coincide with each other. ing.

  In addition, an arm portion 105D that protrudes toward the upper surface portion of the front cover 101 via a cutout portion 104E (see FIG. 1) formed in the FPC 104 is provided on one side in the width direction of the fixed plate 105 by cutting and raising. It has been.

  The arm portion 105D includes a contact portion 105E extending in the plate thickness direction of the fixed plate 105 and a contact portion 105F extending inward in the width direction of the fixed plate 105 from the extending end of the contact portion 105E. Here, the contact portion 105E corresponds to an example of the first contact portion of the present invention, and the contact portion 105F corresponds to an example of the second contact portion of the present invention.

  Then, the fixing plate 105 and the FPC 104 are positioned with respect to the front cover 101 by fitting the positioning hole 105B of the fixing plate 105 and the positioning hole 104D of the FPC 104 into the positioning protrusion 101I (see FIG. 2) of the front cover 101.

  In this state, the screw 106 inserted into the screw insertion hole 105A of the fixing plate 105 and the screw insertion hole 104C of the FPC 104 is fastened to the screw hole 101H (see FIG. 2) of the front cover 101, so that the fixing plate 105 together with the FPC 104 is front cover. 101.

  Next, an example of assembling the release button 102 into the recess 101A provided on the upper surface portion of the front cover 101 will be described with reference to FIGS. The release button 102 is assembled to the recess 101A before the fixing plate 105 and the FPC 104 are assembled to the front cover 101 described above. 6 to 8 are cross-sectional views of a portion obtained by cutting the upper surface portion of the front cover 101 along the radial direction of the recess 101A as viewed from the outside. 6 and 7, the illustration of the compression spring 103 is omitted for convenience.

  First, as shown in FIG. 6, the engaging portion 102 </ b> C of the engaging arm 102 </ b> B provided on the release button 102 is inserted into the through hole 101 </ b> E formed in the recess 101 </ b> A of the front cover 101. At this time, the end of the compression spring 103 is fitted into the annular groove 101B formed in the recess 101A, and the shaft 102A of the release button 102 is inserted into the support hole 101D.

  When the release button 102 is rotated counterclockwise in the figure in this state, as shown in FIG. 7, the column portion 102E of the engagement arm 102B is inserted into the engagement hole 101F narrower than the through hole 101E. The engaging portion 102C engages with the back surface of the outer peripheral wall portion of the engaging hole 101F.

  As a result, the movement of the release button 102 in the direction opposite to the pressing direction is restricted to prevent the release button 102 from coming off. At this time, the engaging portion 102 </ b> C is engaged with the back surface of the wall portion on the outer peripheral side of the engagement hole 101 </ b> F while being pressed by the urging force of the compression spring 103, and in this state, the release button 102 is engaged with the compression spring 103. The pressing operation can be performed against the urging force.

  Next, as described above, the fixing plate 105 is assembled to the front cover 101 together with the FPC 104. In the assembled state, as shown in FIG. 8, the contact portion 105E of the arm portion 105D protruding from the fixing plate 105 contacts the chamfered portion 102D of the locking arm 102B, and the contact portion of the arm portion 105D. 105F contacts the end of the compression spring 103 exposed from the opening 101C of the groove 101B.

  As described above, the contact portion 105E of the arm portion 105D contacts the chamfered portion 102D of the locking arm 102B, thereby restricting the rotation of the release button 102. Further, since the chamfered portion 102D has an R shape, the contact with the contact portion 105E becomes a line contact, the sliding resistance is reduced, and the resistance when the release button 102 is pressed can be reduced. .

  Further, the release button 102 is electrically connected to the fixed plate 105 through the compression spring 103 by the contact portion 105F of the arm portion 105D contacting the end portion of the compression spring 103. Here, the fixing plate 105 is electrically connected to the FPC 104C through the screw 106 and the screw insertion hole 104C of the FPC 104, and the FPC 104 is electrically connected to a main wiring board (not shown) on which a ground pattern is wired. .

  As described above, in the present embodiment, the shaft portion 102A of the release button 102 is moved in the axial direction by the support hole 101D formed in the recess 101A in a state in which the release button 102 is prevented from coming off and restricted in rotation. Supported as possible. Further, the compression spring 103 disposed on the outer peripheral side of the shaft portion 102A of the release button 102 is configured to obtain a return force to the original position when the release button 102 is pressed. As a result, the release button 102 can be pressed in the axial direction without considering the conventional strength reduction of the button support portion and without impairing the operational feeling.

  In the present embodiment, the release button 102 is electrically connected to a main wiring board (not shown) in which a ground pattern is wired via the fixing plate 105, the screw 106, the screw insertion hole 104C of the FPC 104, and the FPC 104C via the compression spring 103. Connected. Thereby, the potential of the release button 102 can be lowered to the ground potential, and the influence of static electricity or the like can be avoided.

  The configuration of the present invention is not limited to that exemplified in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, and the like can be changed as appropriate without departing from the scope of the present invention. It is.

101 Front cover 102 Release button 102C Engagement part 103 Compression spring 104 FPC
105 fixed plate 105E contact part 105F contact part

Claims (3)

A cover, an electrically conductive button member that is axially movable and rotatably supported by the cover, and is disposed between the button member and the cover, and the button member is pressed in the direction of the button member A spring member that is biased in the opposite direction, a switch that is operated by pressing the button member, and a board that is electrically connected to the ground, and that is electrically connected to the board, A fixing plate for fixing the substrate to the cover,
The button member is provided with an engaging portion that engages with the cover when rotating and restricts movement in a direction opposite to the pressing direction of the button member.
The fixing plate contacts the button member in a state where the engaging portion is engaged with the cover when the substrate is fixed to the cover, and a first contact that restricts the rotation of the button member. And a second contact portion that is in electrical contact with the spring member.   2. The electronic device according to claim 1, wherein the first contact portion is in line contact with the button member in an axial direction of the button member.   The electronic device according to claim 1, wherein the button member is subjected to a conductive treatment on a surface of a resin member.

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