JP2010192279A - Sheet with movable contact - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet with a movable contact, with superb click feeling maintained and endowed with both dustproof and drip-proof properties. <P>SOLUTION: The sheet with the movable contact is to be structured of a base sheet 21 having a contact-housing hole 22 of a shape with four directions enlarged of round parts for regulating positions of a contour of the round movable contact 5 and an adhesive layer 23 on a whole underside, a movable contact 5 housed inside the contact-housing hole 22 formed in a dome shape swollen in protrusion upward, and a rectangular small-piece sheet 6 adhered on a top face of the base sheet 21 in a way blocking a whole part of the contact-housing hole 22 with an underside adhesive layer 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sheet with a movable contact constituting a panel switch used in an operation unit of various electronic devices.

  In recent years, various electronic devices have become smaller and thinner, and panel switches used in the operation units of these electronic devices have a movable contact formed of a conductive metal and formed in a dome shape on the lower surface of a sheet member made of an insulating film. A sheet having a movable contact attached to a wiring board provided with a fixed contact is often used because of its thin thickness and good operational feel.

  Such a conventional sheet with a movable contact will be described with reference to FIGS.

  5 is an exploded perspective view of a conventional sheet with a movable contact, FIG. 6 is a cross-sectional view taken along the line S-S in FIG. 5, in which 1 is a base sheet made of an insulating film having an adhesive layer 3 on the lower surface. Thus, a circular contact accommodating hole 2 is provided.

  Reference numeral 5 denotes a movable contact made of an elastic metal thin plate having a circular dome shape bulging upward, and is accommodated in the contact accommodating hole 2 of the base sheet 1.

  Reference numeral 6 denotes a rectangular small sheet made of an insulating film adhered to the upper surface of the base sheet 1 so as to close the contact receiving hole 2 with the adhesive layer 7 on the lower surface. A thin strip-shaped intermediate sheet 8 is sandwiched between and adhered to each other. Here, since the intermediate sheet 8 does not include an adhesive layer, the lower surface of the intermediate sheet 8 and the base sheet 1 are not adhered.

  As described above, the conventional sheet 10 with the movable contact is configured. Although not shown in the figure, the sheet 10 with the movable contact is provided with a protective sheet on the bottom surface of the base sheet 1 in order to prevent foreign matters such as dust from adhering to the adhesive layer 3 and the movable contact 5 on the bottom surface of the base sheet 1. Affixed to the entire surface for storage and transportation.

  Next, a panel switch configured using the sheet with movable contact 10 will be described with reference to a cross-sectional view of the state where the conventional sheet with movable contact is mounted in FIG.

  In FIG. 7, reference numeral 11 denotes a wiring board in which a fixed contact having a central contact 12 and an outer contact 13 as a set is provided on a top surface thereof at a predetermined plurality of locations, and the outer periphery of the movable contact 5 on the wiring board 11. With the lower end placed on the outer contact 13, the movable contact-attached sheet 10 is attached to the wiring substrate 11 with the adhesive layer 3 on the lower surface of the base sheet 1. In this state, the central contact 12 faces the lower surface of the central portion of the movable contact 5 with a space therebetween, and the one set of the central contact 12, the outer contact 13 and the movable contact 5 constitute one switch.

  In the panel switch configured as described above, when a position corresponding to the central portion of the movable contact 5 is pressed from above the small sheet 6, a pressing force is applied to the movable contact 5 via the small sheet 6 and the intermediate sheet 8, and predetermined When the pressing force of is exceeded, the movable contact 5 together with the small piece sheet 6 and the intermediate sheet 8 is elastically reversed with a click feeling, and the lower surface of the central portion comes into contact with the lower central contact 12. That is, the central contact 12 and the outer contact 13 are electrically connected via the movable contact 5.

  Thereafter, when the pressing force applied to the small piece sheet 6 is released, the movable contact 5 elastically returns to the original upward convex shape with a click feeling by the elastic return force of the movable contact 5 itself, and the central contact 12 and the outer contact 13 is electrically insulated.

  Here, in the conventional product, at the time of the pressing operation, the air is moved inside and outside the contact receiving hole 2 in accordance with the compression and expansion of the air located below the dome shape of the movable contact 5 by the elastic reversal of the movable contact 5 and the elastic return operation. Since the intermediate sheet 8 is interposed on the lower surface of the small piece sheet 6 so that the contact receiving hole 2 of the base sheet 1 is not sealed, the operation of the movable contact 5 is suppressed. A panel switch having a good click feeling was obtained.

As prior art document information related to the invention of this application, for example, Patent Document 1 and Patent Document 2 are known.
JP 2003-151393 A JP-A-8-298045

  However, since the conventional sheet with movable contact 10 has a configuration in which the intermediate sheet 8 is interposed below the small piece sheet 6 and adhered to the base sheet 1, the air in the contact receiving holes 2 of the base sheet 1 becomes the intermediate sheet. 8 It was possible to flow in and out through the lower surface portion, and a good click feeling was obtained. However, there is a possibility that outside dust may flow into the contact hole 2 along with the flow of air. There was also a demand for improvement in drip-proofness.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a sheet with a movable contact that maintains a good click feeling and has dust resistance and drip resistance.

  In order to achieve the above object, the present invention has the following configuration.

  According to a first aspect of the present invention, there is provided a base sheet made of a resin film having a contact accommodating hole and having an adhesive layer on the lower surface, and a dome-shaped movable contact made of a conductive metal and swelled upward. A sheet with a movable contact provided with a small piece sheet adhered to the upper surface of the base sheet in a state of being accommodated in the accommodation hole, wherein the small piece sheet is adhered with the upper surface of the contact accommodation hole sealed, and the contact accommodation hole Is a sheet with a movable contact characterized in that the position of the movable contact is regulated at a part of its inner periphery, and the remaining part is formed larger than the movable contact. While the position is restricted, the volume of the contact hole is enlarged within the range covered by the small sheet, so that the compression and expansion of the air below the dome shape of the movable contact due to the pressing operation is alleviated and a good clip is achieved. Can to what can feel it has the effect of the upper surface of the contact housing hole because it is sealed with a piece sheet, it is possible to provide a movable contact attached sheet with dust resistance and drip-proofness.

  According to a second aspect of the present invention, in the first aspect of the invention, the small piece sheet is rectangular, the movable contact is a circular dome shape, and the contact receiving hole has a large inner peripheral portion in the corner direction of the small piece sheet. In the case of using a circular movable contact and a rectangular small piece sheet, the contact receiving hole can be efficiently provided large and a good click feeling can be obtained. It has the action.

  The invention according to claim 3 is the invention according to claim 1, characterized in that the small piece sheet is made of polypropylene resin or polyurethane resin, and has good flexibility and inversion and return operation of the movable contact. Since the influence of the bending of the small piece sheet on the sheet is suppressed, it has an effect that a better click feeling can be obtained.

  As described above, according to the present invention, it is possible to obtain an advantageous effect that it is possible to provide a sheet with a movable contact that maintains a good click feeling and has dust resistance and drip resistance.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of the prior art, and detailed description is simplified.

(Embodiment)
1 is a plan view of a sheet with a movable contact according to an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a cross-sectional view taken along line RR in FIG. A base sheet made of a polyethylene terephthalate resin (PET resin) film provided with an adhesive layer 23 on the entire surface, is provided with contact receiving holes 22 formed in a shape in which four directions in a circular shape in a top view are enlarged at predetermined positions.

  Reference numeral 5 denotes a circular movable contact formed in a dome shape bulging upward using a copper alloy plate such as phosphor bronze or an elastic metal thin plate such as a stainless steel plate, and is accommodated in the contact accommodating hole 22 of the base sheet 21. ing.

  Reference numeral 6 denotes a rectangular small piece sheet made of a PET resin film having an adhesive layer 7 on the lower surface. The adhesive layer 7 on the lower surface closes the entire contact receiving hole 22 and adheres to the upper surface of the base sheet 21. Thus, the central portion of the upper surface of the movable contact 5 is also adhered and held to position the movable contact 5.

  The contact receiving hole 22 is formed in a hole shape in which the upper portion is closed in a sealed state by the small piece sheet 6 and the portions corresponding to the four corners of the rectangular shape of the small piece sheet 6 are greatly expanded. The remaining arc portion restricts the position of the outer periphery of the movable contact 5.

  As described above, the sheet 30 with the movable contact is configured. Although not shown, in order to prevent dust from adhering to the adhesive layer 23 on the lower surface of the base sheet 21 and the movable contact 5, cover the entire lower surface with the adhesive layer 23 of the base sheet 21 with a protective sheet made of a PET resin film or the like. It is the same as in the past that it is adhered and stored, transported, and the like.

  The sheet 30 with a movable contact configured as described above is used by being mounted on a wiring board of an electronic device, as shown in the sectional view of the mounted state in FIG.

  In FIG. 4, 11 is a wiring board having a fixed contact on the upper surface, and the fixed contact is a set of a central contact 12 and an outer contact 13 provided at a predetermined distance from the central contact 12. A plurality of sets are provided at predetermined locations.

  On this wiring board 11, the sheet 30 with the movable contact is attached by being adhesively fixed with the adhesive layer 23 on the lower surface of the base sheet 21, and in this state, each movable contact 5 is placed on the outer contact 13 at the outer peripheral lower end. The center contact 12 faces the lower surface of the central portion of the movable contact 5 with a space therebetween, and one set of fixed contact and one movable contact 5 constitute one switch, and a panel switch is constituted as a whole. .

  In the panel switch configured as described above, when a position corresponding to the center portion of the movable contact 5 is pressed from above the small piece sheet 6, a pressing force is applied to the movable contact 5 via the small piece sheet 6 and a predetermined force is applied. When it exceeds, the dome-shaped central portion of the movable contact 5 together with the small piece sheet 6 is elastically inverted to a downward convex shape with a click feeling, and comes into contact with the lower central contact 12 facing the lower surface of the central portion.

  As a result, the central contact 12 and the outer contact 13 are electrically connected via the movable contact 5, that is, the switch is turned on.

  When the movable contact 5 is pressed and elastically reversed, the air below the dome shape of the movable contact 5 is compressed, but the contact receiving hole 22 is expanded to the outside of the circular shape of the movable contact 5. Since it is provided in a shape having a protruding portion and the volume of the contact receiving hole 22 is increased as a whole, the effect on the click feeling of the movable contact 5 due to this compression is suppressed, and a good click feeling can be obtained. Become.

  Thereafter, when the pressing force is released, the elastic contact force of the movable contact 5 itself causes the dome-shaped central portion to elastically return to the original upward convex shape with a click feeling, whereby the central contact 12 and the outer contact 13 Are electrically insulated, that is, switch off.

  At the time of elastic return of the movable contact 5, negative pressure is generated because air flows downward in the dome shape. However, since the volume in the contact receiving hole 22 is increased even in this elastic return operation, negative pressure is generated. The influence of the pressure on the click feeling can be suppressed and a good click feeling can be obtained.

  Thus, according to the present embodiment, the movable contact 5 undergoes elastic reversal and elastic return operation during the switch-on / off operation, and is sandwiched between the dome-shaped portion below the movable contact 5 and the upper surface of the wiring board 11. Even if the compressed air is compressed and expanded, the contact receiving hole 22 is provided larger than the outer shape of the movable contact 5, so that the air in the dome-shaped portion below the movable contact 5 freely moves in the contact receiving hole 22. To reduce the click feeling.

  Moreover, since the small piece sheet 6 covers the upper part of the contact accommodating hole 22 in a sealed state, there is no gap between the small piece sheet 6 and the base sheet 21, and the sheet 30 with a movable contact that is dustproof and dripproof. It can be.

  In addition, if the small piece sheet | seat 6 is made into a rectangle, it is easy to provide the enlarged part of the contact accommodating hole 22 in the corner | angular direction, and it is preferable. In other words, the circular movable contact 5 has a predetermined area on the corner direction side, so that the enlarged area of the contact receiving hole 22 can be efficiently and effectively disposed using the area. it can. In other words, an enlarged portion of the contact receiving hole may be formed in the shape of a small sheet that can secure such a region. Moreover, although the thing of the contact accommodation hole 22 which provided the four enlarged parts was demonstrated as a structural example using the rectangular small piece sheet 6 above, the number of arrangement | positioning of an enlarged part is not restricted to four.

  Further, the shape of the movable contact 5 is not limited to a circle, and may be a shape according to the application such as a strip shape or a polygonal shape in which both ends of the circle are opposed, and according to the shape of the movable contact 5 to be used. The contact receiving hole of the base sheet may be provided large within an allowable range of the size of the small sheet.

  Further, if the small piece sheet made of the above-described PET resin film is made of a polypropylene resin film or a polyurethane resin film, the flexibility of the small piece sheet is improved. The influence of the bending of the sheet can be suppressed, and a better click feeling can be obtained.

  The sheet with a movable contact according to the present invention has an advantageous effect that it can provide a dust-proof and drip-proof material while maintaining a good click feeling, and can be used for operation parts of various electronic devices. Useful.

The top view of the sheet | seat with a movable contact by one embodiment of this invention Exploded perspective view RR line sectional view in FIG. Sectional view of the same implementation state Disassembled perspective view of a conventional sheet with movable contacts SS sectional view in FIG. Cross-sectional view of the same mounting state

DESCRIPTION OF SYMBOLS 5 Movable contact 6 Small piece sheet | seat 7,23 Adhesive layer 11 Wiring board 12 Central contact 13 Outer contact 21 Base sheet 22 Contact accommodation hole 30 Sheet | seat with movable contact

Claims (3)

A base sheet made of a resin film having a contact accommodating hole and having an adhesive layer on the lower surface, and a dome-shaped movable contact made of conductive metal and swelled upward are accommodated in the contact accommodating hole, and the upper surface of the base sheet A sheet with a movable contact that is adhered to the upper surface of the contact receiving hole, and the contact receiving hole positions the movable contact at a part of the inner periphery of the contact receiving hole. A sheet with a movable contact, characterized in that the remaining portion is formed larger than the movable contact. 2. A movable contact according to claim 1, wherein the small sheet is rectangular, the movable contact is a circular dome shape, and the contact receiving hole is widened in an inner peripheral portion toward the corner of the small sheet. Sheet. The sheet with a movable contact according to claim 1, wherein the small piece sheet is made of polypropylene resin or polyurethane resin.

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