JP2008311101A - Key switch structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a key switch structure which is easy to assemble and in which a switch can be operated certainly while a click feeling without variations can be obtained. <P>SOLUTION: In the key switch structure, a substrate 3 on which a membrane switch 4 is formed and an elastic operating plate 9 having a spherical plate-like pressing member 9a with a projection on a concave face connected through a hinge on a plate-like base are positioned by an identical positioning part formed on a chassis 1 and are overlapped on the chassis 1 surface. The projection 9b of the spherical plate-like pushing member 9a is brought into contact with a membrane dome 3a of the membrane switch 4 and, furthermore, a keytop 5 for pressing the spherical plate-like pushing member 9a is arranged on the spherical plate-like pushing member 9a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic device, and more particularly to a switch structure thereof.

  An example of a conventional PTT (push to talk) switch structure of a radio device will be described with reference to FIGS. FIG. 6 is an exploded perspective view showing an example of a PTT switch structure of a conventional wireless device, and FIG. 7 is a cross-sectional view showing cross sections AA and BB in FIG.

  The chassis 1 shown in FIGS. 6 and 7 is provided with a rectangular recess 1a, and a membrane switch 4 is fitted into the rectangular recess 1a. The membrane switch 4 is formed by attaching a resin plate having a membrane dome 3a formed on a small substrate 3. By pressing the membrane dome 3a, the conductor pattern formed on the small substrate 3 is conducted by the conductor film provided on the back surface of the membrane dome 3a.

  After the membrane switch 4 is fitted into the rectangular recess 1a of the chassis 1, a waterproof sheet 8 is attached to the chassis 1 so as to close the rectangular recess 1a. Further, the key top 5 is disposed on the waterproof sheet 8. The key top 5 is integrally formed by fitting the convex portion 6 a of the resin knob 6 into the concave portion 7 a of the rubber knob 7. The key top 5 is arranged so that the central axes of the convex spherical surface 7b and the membrane dome 3a coincide.

  That is, the flange 6b of the resin knob 6 is locked to the peripheral edge of the hole 2a of the front case 2 assembled to the chassis 1, and the movement of the resin knob 6 in the direction away from the membrane switch 4 is restricted, and the membrane dome 3a The flange 6b of the resin knob 6 is in pressure contact with the peripheral edge of the hole 2a of the front case 2 by elasticity.

  In the above configuration, when the resin knob 6 protruding from the hole 2a of the front case 2 is pressed with a finger, the resin knob 6 moves toward the inside of the front case 2 and presses the rubber knob 7 and the waterproof sheet 8, and the membrane switch 4 becomes conductive. When the finger is released from the resin knob 6, the resin knob 6 is pushed back by the elasticity of the membrane dome 3a, and the membrane switch 4 becomes non-conductive.

  In the conventional PTT switch structure described above, between the front case 2 and the resin knob 6, between the resin knob 6 and the rubber knob 7, between the chassis 1 and the membrane dome 3a, and between the chassis 1 and the front case 2. When the center axis of the rubber knob 7 and the center axis of the membrane dome 3a are deviated due to variations in parts dimensions and assembly, or when the key top 5 is tilted by biasing the resin knob 6 and pressing it, the membrane dome 3a Since there is a case where the key is pressed, the feeling of pressing the key, that is, the feeling of clicking varies, which is an obstacle to the reliable operation of the switch.

  In the switch mounting structure proposed in Japanese Utility Model Laid-Open No. 4-101324, the key top 2 is guided by the panel 1 and the printed circuit board 5, and the spring 8 is interposed between the key top 2 and the printed circuit board 5. .

In this switch mounting structure, the key top 2 is unlikely to fall down and the variation in the force of pressing the key top 2 is reduced, but the spring 8 is compressed and incorporated between the key top 2 and the printed circuit board 5. Therefore, there is a problem that the assembly is troublesome and the number of assembling steps increases.
Japanese Utility Model Publication No. 4-101324, abstract, FIG.

  The present invention has been made in view of the above points, and the object of the present invention is a key switch structure that is easy to assemble, has a consistent click feeling, and can operate the switch reliably. Is to provide.

  The key switch structure according to the present invention has the same positioning in which a substrate on which a membrane switch is formed and an elastic operation plate in which a spherical plate-like pusher having a protrusion on a concave surface is connected to a plate-like base via a hinge are formed on a chassis. The spherical plate-like pusher projection is brought into contact with the membrane dome of the membrane switch, and the key top for pushing the spherical plate-like pusher is placed on the spherical plate-like pusher. It is arranged in.

  In the key switch structure, the spherical plate-like pusher is connected to the plate-like base via two hinges facing each other on both sides.

  Further, in each of the key switch structures, the key top is formed by fitting a resin knob and a rubber knob, and the resin knob is surrounded by the flange with its flange locked at the hole periphery of the front case. The pressed portion is exposed from the hole, and the rubber knob is urged toward the outside of the front case by the membrane dome.

  In each of the key switch structures, a waterproof sheet is interposed between the rubber knob and the membrane dome.

  In each of the key switch structures, the surface of the rubber knob on the membrane dome side has a convex spherical shape.

  Each key switch structure is applied to a PTT used for a radio.

  According to the key switch structure of the present invention, assembly is simple, a click feeling without variation is obtained, and the switch can be operated reliably.

  FIG. 1 is an exploded perspective view showing a PTT switch structure of a radio according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing cross sections AA and BB in FIG. In this example, in the switch structure of the conventional radio PTT described with reference to FIGS. 6 and 7, an elastic operation plate 9 also shown in detail in FIG. 3 is interposed between the membrane dome 3 a and the waterproof sheet 8. Other configurations are the same as those of the conventional one described with reference to FIGS. 6 and 7, and detailed description thereof is omitted.

  As shown in detail in FIG. 3, the elastic operation plate 9 used in the embodiment has a shape in which a spherical plate-like pusher 9a is connected via two hinges 9c and 9d facing the plate-like base 9f, and can be elastically deformed. Made of a good resin. The concave surface of the spherical plate-shaped pusher 9a is disposed on the membrane switch 4 side, and a projection 9b is formed. The edge 9e of the plate-like base 9f is bent in an L shape toward the membrane switch 4, and is positioned by the rectangular recess 1a of the chassis 1 that positions the small substrate 3.

  The protrusion 9b of the spherical plate-like pusher 9a contacts the top of the membrane switch 4. 4 and 5 show the operating state of the switch structure of the embodiment. In these operating states, the projection of the spherical plate-like pusher 9a pushes the membrane dome 3a of the membrane switch 4 in a state where the resin knob 6 is tilted by pushing the resin knob 6 biased.

  In these states, the membrane dome 3a and the projection 9b of the spherical plate-like pusher 9a are pressed against each other with the waterproof sheet 8 interposed therebetween. However, since the spherical plate-like pusher 9a has a spherical shape, as indicated by an arrow. The center portion of the membrane dome 3a is pushed in the vertical direction, and the click feeling does not vary.

  Further, since the spherical plate-like pusher 9a is supported by the plate-like base 9f via the two hinges 9c and 9d facing each other, the inclination of the hinge is canceled and the spherical plate-like pusher 9a is not tilted. The variation in feeling is further reduced. Even when the center axis of the rubber knob 7 and the center axis of the membrane dome 3a are deviated due to variations in dimensions and assembly between parts, the variation in the click feeling is similarly suppressed, and the switch can be operated reliably.

  By appropriately setting the width and length of the two hinges 9c and 9d and the elastic modulus of the elastic operating plate 9, the load of the key can be optimized.

  The embodiment is configured as described above, but the invention is not limited to this. For example, the invention can be applied to a switch other than the PTT. Even if the elastic operation plate 9 is a single hinge, the effect of the present invention can be obtained.

It is a disassembled perspective view which shows the switch structure of PTT of the radio | wireless machine which is an Example of this invention. It is sectional drawing which shows the switch structure. It is a perspective view which shows the member of the switch structure. It is sectional drawing which shows the operating state of the switch structure. It is sectional drawing which shows the other state of the switch structure. It is a disassembled perspective view which shows the example of the switch structure of PTT of the conventional radio | wireless machine. It is sectional drawing which shows the switch structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chassis, 1a Rectangular recessed part 2 Front case, 2a hole 3 Small board | substrate, 3a membrane dome 4 Membrane switch 5 Key top 6 Resin knob, 6a Convex part, 6b Flange 7 Rubber knob, 7a Concave part, 7b Convex spherical surface 8 Waterproof sheet 9 Elastic actuation plate, 9a Spherical plate-shaped pusher, 9b Protrusion, 9c, 9d Hinge 9e Edge, 9f Plate-shaped base

Claims (6)

A substrate on which a membrane switch is formed and an elastic operating plate in which a spherical plate-like pusher having a projection on a concave surface via a hinge on a plate-like base are positioned by the same positioning portion formed on the chassis and placed on the chassis surface. In addition to overlapping, the protrusion of the spherical plate-like pusher is brought into contact with the membrane dome of the membrane switch, and a key top for pushing the spherical plate-like pusher is arranged on the spherical plate-like pusher. Key switch structure. 2. The key switch structure according to claim 1, wherein the spherical plate-like pusher is connected to the plate-like base via two hinges facing each other on both sides thereof. The key top is formed by fitting a resin knob and a rubber knob. The flange of the resin knob is locked at the hole periphery of the front case, and the pressed portion surrounded by the flange is exposed from the hole. 3. The key switch structure according to claim 1, wherein the rubber knob is urged toward the outside of the front case by the membrane dome. 4. The key switch structure according to claim 1, wherein a waterproof sheet is interposed between the rubber knob and the membrane dome. The key switch structure according to any one of claims 1 to 4, wherein a surface of the rubber knob on the membrane dome side has a convex spherical shape. 6. The key switch structure according to claim 1, wherein the key switch structure is a PTT used in a radio device.

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