JP2012199209A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a configuration in which a static electricity charged in a user is avoided from being discharged to a component mounted on a circuit board through a rotary operation member, without causing degradation in detection precision of an operation state of the rotary operation member, with reduction in cost and size of an electronic apparatus being promoted.SOLUTION: The electronic apparatus includes: an electrode member 30 which is coaxially fixed to the rear surface side of a rotary operation member that is supported by the apparatus body for rotary operation, with a plurality of protruding part 32 which protrude radially provided in circumferential direction; a circuit board 40, being arranged to face the electrode member 30 in non-contact manner in axial direction, in which a plurality of detecting electrode 42 positioned to correspond to the protruding part 32 are provided in the rotational direction of the rotary operation member at constant intervals, and a reference electrode 44 is provided in circumferential direction on the inner peripheral side of the detecting electrode 42; and detecting means 45 which detects change in electrostatic capacitance that occurs between the protruding part 32 and the detecting electrode 42 when the rotary operation member is rotated. A cut 34 through which a part of the reference electrode 44 is exposed is formed at the electrode member 30 and an edge of the cut part 34 is arranged close to the reference electrode 44.

Description

  The present invention relates to an electronic apparatus such as a digital camera provided with a rotation operation member.

  In an electronic device such as a digital camera, a reference electrode is provided on a rotation operation member, and a plurality of detection electrodes are arranged at substantially equal intervals along the rotation direction of the rotation operation member on a circuit board provided on the back side of the rotation operation member. There is something arranged.

  The operation state of the rotation operation member is detected based on the change in the capacitance of the detection electrode according to the rotation operation of the rotation operation member.

  However, in such an electronic device, when operating the rotation operation member, static electricity charged by the user is discharged to the component mounted on the circuit board through the rotation operation member, which adversely affects the mounted component.

  Therefore, the signal detection pattern and the electrostatic discharge pattern are provided on the circuit board, and the operation state of the rotation operation member is detected by sliding the slider provided with each electrode pattern on the rotation operation member. A technique for discharging static electricity to the outside of a circuit board has been proposed (Patent Document 1).

  In addition, by disposing a resin sheet subjected to antistatic processing between the operation member and the circuit board, it is possible to prevent static electricity charged by the user from being discharged through the operation member to the mounted components on the circuit board. A technique has been proposed (Patent Document 2).

JP 2010-161019 A JP 2001-43764 A

  However, in Patent Document 1, since the wear of each electrode pattern and the slider progresses over time due to the sliding of each electrode pattern, the detection accuracy of the operation state of the rotary operation member is lowered. There is a risk.

  Moreover, in the said patent document 2, since the resin sheet which gave the antistatic process is required, the number of parts increases and becomes a cause which prevents the cost reduction and size reduction of an apparatus.

  Therefore, the present invention reduces the cost and size of the electronic device without reducing the detection accuracy of the operation state of the rotation operation member, and the static electricity charged to the user passes through the rotation operation member and the circuit board. It aims at providing the mechanism which avoids being discharged by mounting components.

  In order to achieve the above object, an electronic device according to the present invention is fixed on the back side of the rotation operation member coaxially with the rotation operation member. The electrode member provided with a plurality of convex portions projecting in the radial direction in a circumferential direction and the electrode member is arranged to face the electrode member in a non-contact manner in the axial direction, and the number of the convex portions at positions corresponding to the convex portions. A circuit board in which a larger number of detection electrodes are provided at a plurality of locations along the rotation direction of the rotation operation member, and a reference electrode is provided along the circumferential direction on the outer peripheral side or inner peripheral side of the detection electrode; A capacitance detecting means for detecting a change in capacitance generated between the convex portion of the electrode member and the detection electrode of the circuit board when the rotation operation member is rotated; A notch in which a part of the reference electrode is exposed The formed on the electrode member, characterized in that the edge of the notch is arranged in proximity to the reference electrode.

  The electronic device of the present invention includes a rotation operation member that is supported by the device main body so as to be capable of rotation operation, and a convex portion that is fixed coaxially with the rotation operation member on the back side of the rotation operation member and protrudes in the radial direction. An electrode member provided at a plurality of locations in the direction is opposed to the electrode member in a non-contact manner in the axial direction, and a number of detection electrodes larger than the number of the convex portions are rotated at positions corresponding to the convex portions. A circuit board provided with a plurality of locations along the rotation direction of the operation member, and a reference electrode provided along the circumferential direction on the outer peripheral side or inner peripheral side of the detection electrode, and when the rotation operation member is rotated And a capacitance detecting means for detecting a change in capacitance generated between the convex portion of the electrode member and the detection electrode of the circuit board, wherein a part of the reference electrode is electrically conductive. Providing a conductive member to the electrode member. Sexual member, characterized in that it has arranged close compared to the reference electrode.

  According to the present invention, the static electricity charged to the user passes through the rotary operation member while reducing the cost and size of the electronic device without degrading the detection accuracy of the operation state of the rotary operation member. It is possible to avoid the discharge to the mounted component.

It is sectional drawing of the attachment part of the operation unit containing the rotation operation dial in the digital camera which is an example of embodiment of the electronic device of this invention. It is a disassembled perspective view of the operation unit shown in FIG. It is the figure which looked at the circuit board from the side which opposes a dial electrode plate to an axial direction. It is the figure which looked at the dial electrode plate from the axial direction. It is a figure for demonstrating the positional relationship of a circuit board and a dial electrode plate.

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

  FIG. 1 is a cross-sectional view of a mounting portion of an operation unit including a rotary operation dial in a digital camera which is an example of an embodiment of an electronic apparatus of the present invention, and FIG. 2 is an exploded perspective view of the operation unit shown in FIG.

  As shown in FIGS. 1 and 2, a rotation operation dial 20 is supported on the dial base 24 held by the camera body 1 so that the rotation operation can be performed. The dial base 24 and the rotary operation dial 20 are formed of an insulating material. The camera body 1 and the dial base 24 are sealed with a sealing material 21. Here, the camera body 1 corresponds to an example of a device body of the present invention.

  Concave and convex portions are formed in the inner peripheral portion of the dial base 24 along the circumferential direction. A ball 27 is fitted into the concave portion of the concave and convex portion, and the ball 27 is pressed against the dial base 24 by a coil spring 26 disposed between the ball 27 and the rotary operation dial 20. Thereby, a click feeling is given when the rotary operation dial 20 is rotated.

  A dial electrode plate 30 formed of a conductive material such as a metal plate is fixed to the rotary operation dial 20 substantially coaxially with the rotation operation dial 20 by a screw or the like, and the dial electrode plate 30 is rotated. It can be rotated integrally with the operation dial 20. Here, the rotation operation dial 20 corresponds to an example of a rotation operation member of the present invention, and the dial electrode plate 30 corresponds to an example of an electrode member of the present invention.

  A push button 10 is supported at the center of the rotary operation dial 20 so as to be capable of being pressed, and the press button 10 and the rotary operation dial 20 are partitioned by a dial cover 22 formed of an insulating material. .

  A button boot 11 and a button boot base 12 are provided between the shaft portion of the push button 10 and the rotation operation dial 20. The button boot base 12 is fixed to the rotation operation dial 20 via a double-sided tape 13 or the like. Has been.

  A button stopper 14 is fixed to the tip of the shaft portion of the push button 10 with a screw or the like. By this fixing, the button boot 11 is elastically deformed, and the gap between the pressing button 10 and the rotary operation dial 20 is closed and sealed.

  When the push button 10 is pressed, the side wall of the elastically deformable button switch rubber 16 formed of an insulating material is elastically deformed, and the conductor 16a provided in the center is formed on the flexible printed circuit board 46. Touch the switch pattern. Thereby, it is possible to detect a pressing operation of the pressing button 10.

  The flexible printed wiring board 46 is fixed to a board receiving plate 36, and the board receiving plate 36 is fixed to the dial base 24 with screws or the like.

  A dial pin 18 is fixed to the substrate receiving plate 36 by caulking or the like. The dial pin 18 is inserted into a notch (not shown) formed in the button stopper 14 via the button switch rubber 16. Thereby, it is possible to prevent the push button 10 from rotating when the rotary operation dial 20 is rotated.

  The dial spacer 28 is set to have a thickness such that the dial ring 29 is compressed by a predetermined amount. By disposing the dial ring 29 between the rotary operation dial 20, the dial base 24, and the dial electrode plate 30, the gap between the rotary operation dial 20 and the dial electrode plate 30 is closed and sealed.

  Further, the circuit board 40 is fixed to the camera body 1 in a state of facing the dial electrode plate 30 in a non-contact manner in the axial direction. On the circuit board 40, a detection electrode 42 (see FIG. 3) for detecting the operation state of the rotary operation dial 20 and a reference electrode 44 serving as a reference potential are formed.

  Next, the circuit board 40 and the dial electrode plate 30 will be described with reference to FIGS.

  3 is a diagram of the circuit board 40 viewed from the side facing the dial electrode plate 30 in the axial direction, FIG. 4 is a diagram of the dial electrode plate 30 viewed from the axial direction, and FIG. 5 is a diagram of the circuit board 40 and the dial electrode plate 30. It is a figure for demonstrating these positional relationships.

  As shown in FIG. 3, a hole 41 that is substantially concentric with the rotation shaft of the rotary operation dial 20 is formed at the center of the circuit board 40.

  Around the hole 41, a plurality of detection electrodes 42 are provided at substantially equal intervals along the rotation direction of the rotary operation dial 20, and a ground is set as a reference potential on the inner peripheral side of the detection electrode 42. A reference electrode 44 is provided along the entire circumference.

  In addition, a capacitance detection IC 45 is mounted on the circuit board 40, and the capacitance detection IC 45 is electrically connected to the plurality of detection electrodes 42 via a wiring pattern.

  On the other hand, as shown in FIG. 4, the dial electrode plate 30 is provided with a plurality of convex portions 32 projecting radially outward at substantially equal intervals in the circumferential direction. The convex portion 32 has a shape corresponding to the detection electrode 42 of the circuit board 40 and is opposed to the detection electrode 42 in a non-contact manner in the axial direction.

  The number of detection electrodes 42 is larger than the number of convex portions 32. In the present embodiment, the number of detection electrodes 42 is 20, and the number of convex portions 32 is five.

  Further, in the outer peripheral portion of the dial electrode plate 30, a notch 34 that is notched in a concave shape toward the radially inner side is formed between the convex portions 32 adjacent to each other in the circumferential direction. As shown in FIG. 5, a part of the reference electrode 44 is exposed in the notch 34, whereby the edge of the notch 34 is disposed close to the reference electrode 44.

  Among the plurality of detection electrodes 42 arranged on the circuit board 40, the detection electrode 42 facing the convex portion 32 of the dial electrode plate 30 has a capacitance compared to the detection electrode 42 not facing the convex portion 32. It has come to change greatly.

  When the rotary operation dial 20 is rotated, the capacitance generated between the convex portion 32 of the dial electrode plate 30 and the detection electrode 42 of the circuit board 40 changes. Then, by detecting the change amount by the capacitance detection IC 45, the operation state (rotation angle) of the rotation operation dial 20 can be detected.

  By the way, when the rotary operation dial 20 is rotated, if static electricity charged by the user is discharged to the rotary operation dial 20, the static electricity tends to flow through the sharp edge of the member or the gap of the conductive member. There is.

  Here, in this embodiment, as described above, the edge of the notch 34 formed in the dial electrode plate 30 is disposed close to the reference electrode 44 serving as the ground. Accordingly, the static electricity discharged from the user to the rotary operation dial 20 passes through the dial electrode plate 30 and then flows from the edge of the notch 34 to the reference electrode 44 and is grounded.

  In the present embodiment, solder is applied to a part of the reference electrode 44, and the tip of the solder portion is disposed closer to the dial electrode plate 30 than the reference electrode 44. Accordingly, the static electricity discharged from the user to the rotary operation dial 20 passes through the dial electrode plate 30 and then flows from the solder portion to the reference electrode 44 through the gap between the dial electrode plate 30 and the solder portion, and is grounded.

  As described above, in this embodiment, since the detection electrode 42 and the convex portion 32 of the dial electrode plate 30 are not in contact with each other, the wear of the detection electrode 42 and the convex portion 32 progresses over time. In addition, it is possible to avoid a decrease in the detection accuracy of the operation state of the rotary operation dial 20.

  Further, in this embodiment, since it is not necessary to dispose a resin sheet subjected to antistatic processing between the circuit board 40 and the dial electrode plate 30, the number of parts does not increase and the cost of the digital camera is reduced. And miniaturization can be achieved.

  Further, in the present embodiment, static electricity discharged from the user to the rotary operation dial 20 passes through the dial electrode plate 30 and then flows from the edge of the notch 34 or the solder portion applied to the reference electrode 44 to the reference electrode 44. Grounded. Thereby, it is possible to avoid the static electricity charged by the user from being discharged from the leading edge of the convex portion 32 of the dial electrode plate 30 to the mounted component of the circuit board 40 through the rotary operation dial 20 and the dial electrode plate 30. .

  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.

  For example, in the above-described embodiment, the case where the reference electrode 44 is arranged on the inner peripheral side of the detection electrode 42 is exemplified, but the present invention can also be applied to the case where the reference electrode 44 is arranged on the outer peripheral side of the detection electrode 42.

  In the above embodiment, the case where the solder is applied to a part of the reference electrode 44 is exemplified. However, a conductive member such as a metal plate is attached to a part of the reference electrode 44 using a conductive adhesive or the like. It doesn't matter.

DESCRIPTION OF SYMBOLS 1 Camera body 10 Press button 20 Rotation operation dial 30 Dial electrode plate 32 Convex part 34 Notch part 40 Circuit board 42 Detection electrode 44 Reference electrode 45 Capacitance detection IC

Claims (4)

A rotation operation member supported so as to be able to rotate with respect to the device body;
An electrode member fixed on the back side of the rotational operation member coaxially with the rotational operation member, and provided with a plurality of convex portions projecting in the radial direction in the circumferential direction;
A plurality of detection electrodes, which are arranged in a non-contact manner in the axial direction with respect to the electrode member and have a larger number of detection electrodes than the number of the protrusions, are provided at positions corresponding to the protrusions along the rotation direction of the rotation operation member. And a circuit board in which a reference electrode is provided along the circumferential direction on the outer peripheral side or inner peripheral side of the detection electrode;
And a capacitance detecting means for detecting a change in capacitance generated between the convex portion of the electrode member and the detection electrode of the circuit board when the rotation operation member is rotated. ,
An electronic apparatus comprising: a notch portion in which a part of the reference electrode is exposed is formed in the electrode member; and an edge of the notch portion is disposed close to the reference electrode. A rotation operation member supported by the device main body so that the rotation operation is possible;
An electrode member fixed on the back side of the rotational operation member coaxially with the rotational operation member, and provided with a plurality of convex portions projecting in the radial direction in the circumferential direction;
A plurality of detection electrodes, which are arranged in a non-contact manner in the axial direction with respect to the electrode member and have a larger number of detection electrodes than the number of the protrusions, are provided at positions corresponding to the protrusions along the rotation direction of the rotation operation member. And a circuit board in which a reference electrode is provided along the circumferential direction on the outer peripheral side or inner peripheral side of the detection electrode;
And a capacitance detecting means for detecting a change in capacitance generated between the convex portion of the electrode member and the detection electrode of the circuit board when the rotation operation member is rotated. ,
An electronic apparatus, wherein a conductive member is provided on a part of the reference electrode, and the conductive member is disposed closer to the electrode member than the reference electrode.   The electronic device according to claim 2, wherein the conductive member is solder applied to the reference electrode.   4. The reference electrode according to claim 1, wherein the reference electrode is provided on an inner peripheral side of the detection electrode, and the convex portion is provided to project radially outward from an outer peripheral portion of the electrode member. An electronic device according to any one of the above.

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