JP6192348B2 - Push switch - Google Patents

Description

  The present invention relates to a push switch.

  Push switches are known as button switches used for mobile communication devices such as mobile phones, portable and vehicle-mounted audio devices, digital camera VTRs, and the like.

  FIG. 1A shows a cross-sectional view of a push switch described in Patent Document 1. FIG.

  The push switch 100 includes a substrate 101, a movable member 102, a first pressing member 103, a second pressing member 104, a housing 105, a first fixed contact 106, and a second fixed contact 107.

  A concave portion is formed on the surface of the substrate 101, a first fixed contact 106 is arranged at the center of the concave portion, and a second fixed contact 107 is arranged around the concave portion. The movable member 102 is a flexible conductive member having a dome-like shape, and is arranged so that an end thereof is in contact with the second fixed contact 107. The first pressing member 103 is a resin sheet material having a shape obtained by joining two disks having different diameters. The second pressing member 104 is a member having a hemispherical shape and is made of synthetic resin. The bottom surface of the second pressing member 104 is adhered to the back surface of the first pressing member 103, and the vertex of the spherical surface of the second pressing member 104 is in contact with the vertex of the movable member 102. The housing 105 is bonded to the upper portion of the substrate 101, and forms a space for accommodating the movable member 102, the lower portion of the first pressing member 103, and the second pressing member 104 together with the concave portion of the substrate 101.

  When the surface of the first pressing member 103 is pressed, the curve of the movable member 102 is reversed, and the central portion including the apex of the movable member 102 contacts the first fixed contact 106. When the vertex of the movable member 102 contacts the first fixed contact 106, the first fixed contact 106 and the second fixed contact 107 are electrically connected via the movable member 102.

  When the surface of the first pressing member 103 is pressed, the movable member 102 functions as a spring that generates a spring load that acts in a direction opposite to the force pressing the surface of the first pressing member 103. When the surface of the first pressing member 103 is pressed, the spring load of the movable member 102 acting in the direction opposite to the pressing direction causes a click feeling.

  As devices equipped with push switches become smaller, push switches are becoming smaller. As the push switch is downsized, the push switch is not pressed directly, but is pressed through a pressing member also called a pusher. In the structure in which the push switch is pressed through the pusher, there is a possibility that a deviation may occur between the pusher assembly position and the push switch pressing member assembly position. If a deviation occurs between the pusher assembly position and the push switch push-in member assembly position, a sufficient click feeling may not be obtained. Japanese Patent Application Laid-Open Publication No. 2004-228561 describes a push switch that can obtain a sufficient click feeling even when a shift occurs between the pusher assembly position and the push switch assembly position.

  FIG. 1B is a cross-sectional view of the push switch described in Patent Document 2.

  The push switch 110 includes a substrate 111, a movable member 112, a first pressing member 113, a second pressing member 114, a fixed sheet 115, a first fixed contact 116, a second fixed contact 117, and a holding sheet 118. And have.

  The fixed sheet 115 is a sheet material in which a void having a square cross section when viewed from above is formed, and is formed of a synthetic resin. A first fixed contact 116 is disposed at the center of the recess formed by the gap portion of the fixed sheet 115, and a second fixed contact 117 is disposed around the recess. The movable member 112 is a flexible conductive member having a dome-like shape, and is arranged so that an end thereof is in contact with the second fixed contact 117. The first pressing member 113 is a resin sheet material having a disk shape. The second pressing member 114 is a member having a disk shape whose diameter is smaller than that of the first pressing member 113, and is formed of a synthetic resin having higher hardness than the first pressing member 113. The holding sheet 118 is formed of an insulating resin film.

  The fixed sheet 115 is bonded to the surface of the substrate 111 to form a space for accommodating the movable member 112 and the second pressing member 114 together with the concave portion of the substrate 101. The back surface of the first pressing member 113 is bonded to the center of the front surface of the holding sheet 118 with an adhesive 119. The surface of the second pressing member 114 is bonded to the center of the back surface of the holding sheet 118 with an adhesive 119. The back surface of the second pressing member 114 is in contact with the apex of the movable member 102. The outer edge of the holding sheet 118 is bonded to the surface of the fixed sheet 115. The holding sheet 118 functions as a waterproof sheet material that seals the space for housing the movable member 112 and the second pressing member 114 and waterproofs the space by bonding the outer edge to the upper surface of the fixed sheet 115.

  When the surface of the first pressing member 113 is pressed through a pusher (not shown), the curvature of the movable member 112 is reversed, and the central portion including the apex of the movable member 112 contacts the first fixed contact 116. When the vertex of the movable member 112 contacts the first fixed contact 116, the first fixed contact 116 and the second fixed contact 117 are electrically connected via the movable member 112.

  The push switch 110 includes a first pressing member 113 disposed on the surface of the holding sheet 118 and immediately above the vertex of the movable member 112, and a second pressing member formed on the back surface of the holding sheet 118 and immediately above the vertex of the movable member 112. 114. When the first pusher member 113 is pushed by the pusher, the second pusher member 114 always pushes the apex of the movable member 112, that is, the central portion, and elastically reverses it. For this reason, in the push switch 110, even when a shift occurs between the pusher mounting position and the push switch 110 mounting position, a sufficient click feeling can be obtained and the operating life can be improved. .

JP 2004-79220 A JP 2011-100549 A JP 2010-257600 A JP 2012-234630 A

  However, in the push switch 110, since the first pressing member 113 and the second pressing member 114 are bonded to the holding sheet material 118 by the adhesive 119, the holding sheet material 118 is subjected to an external impact and repeated pressing operations. There is a risk of peeling.

  In the push switch described in Patent Document 3, the protrusion 10 is disposed between the surface of the sheet member 7 and the light guide material 9. The sheet member 7 of Patent Document 3 corresponds to the holding sheet material 118 of FIG. 1B, and the protrusion 10 of Patent Document 3 corresponds to the first pressing member 113 of FIG. 1B.

  A groove 14 a is formed in the wall portion of the recess of the sheet member 7 for disposing the protrusion 10. On the other hand, a flange 14b is formed on the edge of the protrusion 10. In the push switch described in Patent Document 3, by engaging the groove 14 a formed in the sheet member 7 and the hook-shaped portion 14 b formed in the protruding portion 10, the sheet member 7 and the protruding portion 10 are engaged with each other. The bonding strength between them is improved.

  In the push switch described in Patent Document 3, a groove 14 a is formed in the recess of the sheet member 7 so as to engage the single protrusion 10. On the other hand, since the push switch 110 shown in FIG. 1B has two pressing members, the first pressing member 113 and the second pressing member 114, the same structure as the push switch described in Patent Document 3 is adopted. It is not easy. Even when the same structure as the push switch described in Patent Document 3 is adopted, the holding sheet material 118 is formed with two grooves for engaging the first pressing member 113 and the second pressing member 114. This may increase the manufacturing cost.

  In the push switch described in Patent Document 4, the projection 113 is disposed between the surface of the holding sheet 112 and the light guide sheet 114. The holding sheet 112 of Patent Document 4 corresponds to the holding sheet material 118 of FIG. 1B, and the projection 113 of Patent Document 4 corresponds to the first pressing member 113 of FIG.

  On the surface of the holding sheet 112, a first recess 112d having a first pitch and a second recess 112e having a second pitch different from the first pitch are formed. The projection 113 is filled and cured on the surface of the holding sheet 112 where the first recess 112d and the second recess 112e are formed. Next, the light guide sheet 114 is bonded onto the surface of the holding sheet 112 with an adhesive. In the push switch described in Patent Document 4, the projection 113 is disposed between the holding sheet 112 and the light guide sheet 114 that are bonded to each other. Since the first recess 112d and the second recess 112e are formed on the surface of the holding sheet 112, the adhesive strength with the light guide sheet 114 is improved. In the push switch described in Patent Document 4, the bonding strength of the projection 113 is improved by disposing the projection 113 between the holding sheet 112 and the light guide sheet 114 that are firmly bonded.

  In the push switch described in Patent Document 4, a first recess 112 d and a second recess 112 e are formed on the surface of the holding sheet 112. The push switch 110 illustrated in FIG. 1B includes a second pressing member 114 disposed on the back surface of the holding sheet material 118 in addition to the first pressing member 113 disposed on the front surface of the holding sheet material 118. In the push switch 110 shown in FIG. 1B, in order to adopt the same structure as the push switch described in Patent Document 4, a similar recess is formed on the back surface of the holding sheet material 118. Further, a sheet material for adhering the second pressing member 114 to the back surface of the holding sheet material 118 is disposed. If such a configuration is adopted, a sheet material for forming recesses on the front surface and the back surface of the holding sheet material 118 and further adhering to the back surface of the holding sheet material 118 may be added, which may increase the manufacturing cost. There is.

  In view of the above, an object of the present invention is to provide a push switch that has a low possibility that a pressing member is peeled off by an external impact and repeated pressing operations.

  In order to achieve the above object, a push switch according to the present invention includes a substrate, a fixed sheet for forming a recess in the surface of the substrate, a first fixed contact disposed in the recess in the surface of the substrate, and the surface of the substrate. The second fixed contact disposed around the first fixed contact and the convex dome shape are housed in the recess on the surface of the substrate so that the end is in contact with the second fixed contact. A movable member, a protective sheet covering the concave portion from above the movable member, a first pressing member disposed on the back surface of the protective sheet, and a second pressing member disposed between the movable member and the first pressing member An adhesive layer that embeds the first pressing member and the second pressing member and adheres to the protective sheet, and is movable by the second pressing member when the first pressing member is pressed from above the protective sheet. The central part of the member is in contact with the first fixed contact.

  Furthermore, it is preferable that the push switch according to the present invention further includes a holding sheet that is bonded to the back surface of the protective sheet and holds the first pressing member, the second pressing member, and the adhesive layer together with the protective sheet.

  Since the push switch further includes a holding sheet, the first pressing member and the second pressing member are less likely to be separated from the protective sheet.

  Furthermore, in the push switch according to the present invention, it is preferable that the end portion of the holding sheet is fixed on the fixed sheet.

  In the push switch, even when the second pressing member is crushed, the possibility that the crushed pieces of the second pressing member are scattered in the space for housing the movable member is reduced.

  Furthermore, in the push switch according to the present invention, it is preferable that the surface of the second pressing member facing the surface of the movable member is a spherical surface.

  In the push switch, since the surface of the second pressing member facing the surface of the movable member is a spherical surface, the second pressing member can press the movable member at the apex of the spherical surface.

  According to the push switch according to the present invention, the first pressing member and the second pressing member are adhered to the back surface of the protective sheet by the adhesive layer that embeds the first pressing member and the second pressing member. The possibility of the pressing member peeling off due to the impact from and the repeated pressing operation became low.

(A) shows sectional drawing of an example of the conventional push switch, (b) shows sectional drawing of the other example of the conventional push switch. It is a perspective view of an example of a push switch. (A) is a top view of the push switch shown in FIG. 2, (b) is a bottom view of the push switch shown in FIG. It is sectional drawing which follows the AA 'line of the push switch shown in FIG. FIG. 3 is an exploded perspective view of the push switch shown in FIG. 2. FIG. 3 is a partially exploded perspective view of the push switch shown in FIG. 2. It is sectional drawing of the other example of a push switch.

  Hereinafter, a push switch according to the present invention will be described with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to these embodiments, and extends to equivalents to the invention described in the claims.

  FIG. 2 is a perspective view of an example of a push switch. 3A is a plan view of the push switch shown in FIG. 2, and FIG. 3B is a bottom view of the push switch shown in FIG. 4 is a cross-sectional view of the push switch shown in FIG. 2 along the line AA ′. FIG. 5 is an exploded perspective view of the push switch shown in FIG. FIG. 5 is an exploded perspective view of the push switch shown in FIG.

  The push switch 1 includes a substrate 10, a fixed sheet 16, a movable member 20, a protective sheet 30, a holding sheet 32, a first pressing member 40, and a second pressing member 42.

  A first fixed contact 12 and a second fixed contact 14 are formed on the surface of the substrate 10. In addition, a fixing sheet 16 on which a hollow portion having a square cross section is formed is bonded to the surface of the substrate 10. The first fixed contact 12 is a conductor having a square plane, and is disposed at the center of the surface of the substrate 10. The second fixed contact 14 is a conductor having a frame-like plane, and is disposed on the surface of the substrate 10 along the inner peripheral wall of the fixed sheet 16 so as to surround the first fixed contact 12.

  A pair of first electrodes 13 a and 13 b and a pair of second electrodes 15 a and 15 b are formed on the back surface of the substrate 10. Further, an insulating sheet material 18 made of an insulating synthetic resin is disposed on the back surface of the substrate 10. The pair of first electrodes 13a and 13b are electrically connected to the first fixed contact 12 via a through electrode and a back surface wiring (not shown), respectively. The pair of second electrodes 15a and 15b are electrically connected to the second fixed contact 14 via a through electrode and a back surface wiring (not shown), respectively.

  The fixed sheet 16 is bonded to the surface of the substrate 10, and forms a space for accommodating the movable member 20, the first pressing member 40, and the second pressing member 42 together with the substrate 10.

  The movable member 20 is a flexible conductive member having a dome shape, and is arranged so that the end portion is in contact with the second fixed contact 14. In one example, the movable member 20 is formed of stainless steel.

  The protective sheet 30 is a flexible insulating resin sheet, and the end of the back surface is bonded to the upper surface of the fixed sheet 16. When the end portion of the protective sheet 30 is bonded to the upper surface of the fixed sheet 16, the protective sheet 30 houses the movable member 20, the first pressing member 40, and the second pressing member 42 together with the substrate 10 and the fixed sheet 16. Seal the space.

  The holding sheet 32 is a sheet material formed of the same material as the protective sheet 30. The end of the front surface of the holding sheet 32 is bonded to the back surface of the protective sheet 30.

  The first pressing member 40 is a resin sheet material having a disk shape. For example, the material of the first pressing member 40 is a polyimide resin. The first pressing member 40 functions to transmit the pressed force to the second pressing member 42 when a pusher (not shown) is pressed.

  The second pressing member 42 is a synthetic resin member having a partial spherical shape. The area of the bottom surface of the second pressing member 42 is smaller than the area of the plane of the first pressing member 40. The second pressing member 42 is arranged so that the vicinity of the apex of the partial spherical shape is in contact with the movable member 20. Since the vicinity of the apex of the partial spherical shape of the second pressing member 42 is arranged so as to contact the movable member 20, the partial spherical shape of the second pressing member 42 is pressed when the second pressing member 42 presses the movable member 20. The force can be concentrated on the apex, and the movable member 20 can be pushed down.

  The material of the second pressing member 42 is, for example, an epoxy resin, but a material having a higher hardness than the material of the first pressing member 40 is selected. As a material of the second pressing member 42, a synthetic resin having a hardness of 80 to 90 is selected when measured by a durometer hardness meter type D (JIS K 6253). When a synthetic resin having a hardness of less than 80 is used as the material of the second pressing member 42, when the second pressing member 42 presses the movable member 20, the vertex of the second pressing member 42 bends and presses the movable member 20. There is a risk that the power to do. When a synthetic resin having a hardness higher than 90 is employed as the material of the second pressing member 42, the manufacturing cost may increase.

  The first pressing member 40 and the second pressing member 42 are each embedded in the adhesive layer 60. The adhesive forming the adhesive layer 60 is a synthetic resin adhesive, but the adhesive forming the adhesive layer 60 is any one of the protective sheet 30, the holding sheet 32, the first pressing member 40, and the second pressing member 42. An adhesive that can satisfactorily adhere to these members is selected. Compared to the case where the first pressing member 40 and the second pressing member 42 are embedded in the adhesive layer 60, the back surface of the first pressing member 40 and the surface of the second pressing member 42 are bonded with an adhesive. And more firmly joined. When the back surface of the first pressing member 40 and the front surface of the second pressing member 42 are bonded, if the pressing operation is repeated, the stress generated on the bonding surface due to the difference in hardness between the first pressing member 40 and the second pressing member 42 The first pressing member 40 and the second pressing member 42 may be peeled off.

  By embedding the first pressing member 40 and the second pressing member 42 in the adhesive layer 60, the stress caused by the difference between the hardness of the first pressing member 40 and the hardness of the second pressing member 42 is applied to the adhesive layer 60. Absorbed. Since the stress caused by the difference between the hardness of the first pressing member 40 and the hardness of the second pressing member 42 is absorbed by the adhesive layer 60, the first pressing member and the second pressing member 42 are separated even if the pressing operation is repeated. The possibility of doing is low.

  When the portion of the protective sheet 30 that contacts the surface of the first pressing member 40 is pressed through a pusher (not shown), the apex of the partial sphere of the second pressing member 42 presses the movable member 20, and the movable member 20. And the center portion including the apex of the movable member 20 contacts the first fixed contact 12. When the apex of the movable member 20 contacts the first fixed contact 12, the first fixed contact 12 and the second fixed contact 14 are electrically connected via the movable member 20.

  FIG. 6 is a partially exploded perspective view of the push switch.

  The adhesive layer 60 that embeds the first pressing member 40 and the second pressing member 42 is wrapped by the protective sheet 30 and the holding sheet 32 having the front end bonded to the back surface of the protective sheet 30.

  Since the second pressing member 42 is a member that transmits the force generated when pressed to the movable member 20, the force generated when pressed is applied each time it is pressed. For this reason, when the pressing operation is repeated, the second pressing member 42 may be crushed by the force generated when the pressing operation is performed. When the second pressing member 42 is not held by the protective sheet 30 and the holding sheet 32, the crushed pieces of the second pressing member 42 may be scattered in the space that houses the movable member 20.

  On the other hand, when the second pressing member 42 is held by the protective sheet 30 and the holding sheet 32, the possibility that the second pressing member 42 is scattered in the space in which the movable member 20 is stored is low.

  FIG. 7 is a cross-sectional view of another example of the push switch.

  The push switch 2 is different from the push switch 1 in that the end of the holding sheet 34 is fixed on the upper surface of the fixed sheet 16.

  In the push switch 2, the end of the holding sheet 34 is fixed on the fixed sheet 16, and the space above which the movable member 20, the first pressing member 40 and the second pressing member 42 are accommodated is covered with the holding sheet 34. It has been broken. Further, in the push switch 2, an adhesive layer 60 is formed between the back surface of the protective sheet 30 and the front surface of the holding sheet 34, so that there is a gap between the protective sheet 30 and the holding sheet 34 compared to the push switch 1. There is little risk of peeling. In the push switch 2, even when the second pressing member 42 is crushed, as long as the holding sheet 34 is not damaged, the possibility that the crushed pieces of the second pressing member 42 are scattered in the space for storing the movable member 20 is further reduced. Become.

  In the push switches 1 and 2, the first pressing member 40 and the second pressing member 42 are embedded in the adhesive layer 60 and bonded to the back surface of the protective sheet 30. Therefore, in the push switches 1 and 2, it is unlikely that the first pressing member 40 and the second pressing member 42 are peeled off from the protective sheet 30 due to external impacts and repeated pressing operations.

  Further, the push switch 1 includes a holding sheet 32 that holds the first pressing member 40 and the second pressing member 42 together with the protective sheet 30. Therefore, even when the second pressing member 42 is crushed, there is a low possibility that the crushed pieces of the second pressing member 42 are scattered in the space that houses the movable member 20.

  Further, in the push switch 2, the upper portion of the space that houses the movable member 20, the first pressing member 40, and the second pressing member 42 is covered with the holding sheet 34. Therefore, even when the second pressing member 42 is crushed, the possibility that the crushed pieces of the second pressing member 42 are scattered in the space in which the movable member 20 is accommodated is further reduced.

  In the push switches 1 and 2, the first pressing member 40 is a resin sheet material having a disk shape formed of polyimide resin. However, the first pressing member 40 is a member that functions to transmit the pressed force to the second pressing member 42 when a pusher (not shown) is pressed, and a member that directly presses the movable member 20. is not. Therefore, the first pressing member 40 only needs to have a shape having a surface larger than the surface of the second pressing member 42 so as to transmit the pressing force to the second pressing member 42. The material characteristics such as the shape of the member 40 and the hardness of the material are appropriately determined.

  In the push switches 1 and 2, the second pressing member 42 has a partial spherical shape. However, the second pressing member 42 may have another shape that can concentrate the apex force such as a triangular prism, a quadrangular prism, or a shape obtained by cutting out a part of an ellipsoid. In addition, when a sufficient load is applied to the movable member 20 to bend the movable member 20, the second pressing member 42 may have a shape that presses the movable member 20 in a disk shape or the like. However, it is not preferable that the second pressing member 42 bend excessively when the movable member 20 is pressed, and the second pressing member 42 is formed of a material having a hardness of 0.8 to 0.9.

  The holding sheet may be a sheet material having the same shape as the protective sheet. When the holding sheet is a sheet material having the same shape as the protective sheet, the protective sheet and the holding sheet can be formed using the same frame material. Further, when the holding sheet and the protective sheet are made of the same sheet material, the protective sheet 30 and the holding sheet are bonded so that the end portions thereof coincide with each other, and the protective sheet 30 and the holding sheet are bonded in the manufacturing process. Positioning becomes easy.

  In the push switches 1 and 2, the movable member 20 is formed of a single member, but the movable member 20 may be formed by overlapping a plurality of members having the same shape. When the movable member 20 is formed by overlapping a plurality of members, the plurality of members may be joined to each other or may not be joined to each other. When the movable member 20 is formed by overlapping a plurality of members, the loads of the plurality of members may be the same or the loads may be different from each other. By forming the movable member 20 by overlapping a plurality of members, it is possible to increase the load of the movable member 20.

DESCRIPTION OF SYMBOLS 1, 2 Push switch 10 Board | substrate 12 1st fixed contact 14 2nd fixed contact 16 Fixed sheet 20 Movable member 30 Protection sheet 32, 34 Holding sheet 40 1st pressing member 42 2nd pressing member

Claims (5)

A substrate,
A fixing sheet that forms a recess in the surface of the substrate;
A first fixed contact disposed in the recess of the surface of the substrate;
A second fixed contact disposed around the first fixed contact in the recess of the surface of the substrate;
A movable member that has a convex dome shape and is housed in the concave portion of the surface of the substrate such that an end thereof is in contact with the second fixed contact;
A protective sheet covering the recess from above the movable member;
A first pressing member disposed on the back surface of the protective sheet;
A second pressing member disposed between the movable member and the first pressing member and formed of a material different from a material forming the first pressing member;
An adhesive layer that embeds the first pressing member and the second pressing member and adheres to the protective sheet;
When the first pressing member is pressed from above the protective sheet, the second pressing member causes the central portion of the movable member to contact the first fixed contact.
Push switch characterized by that. The push switch according to claim 1, wherein the second pressing member has a hardness higher than that of the first pressing member. 3. The push switch according to claim 1, further comprising a holding sheet that is bonded to a back surface of the protective sheet and that holds the first pressing member, the second pressing member, and the adhesive layer together with the protective sheet. The push switch according to claim 3 , wherein an end of the holding sheet is fixed on the fixed sheet. The push switch according to any one of claims 1 to 4 , wherein a surface of the second pressing member facing the surface of the movable member is a spherical surface.

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