JP2010257600A - Sheet with movable contact, and push switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet with a movable contact in which a resin mass forming a protrusion is made hard to detach from a sheet member, and a push switch using it. <P>SOLUTION: The sheet member 7 covers a dome-like movable contact 5. The movable contact 5 is stuck to the sheet member 7. The protrusion 10 is provided at a portion of the sheet member 7 positioned so as to lie on top of the movable contact 5. The protrusion 10 protruding in the direction opposite to the direction of the movable contact 5 has a recessed filling part 11 formed in the sheet member 7 so that its bottom part 11b is positioned on the movable contact 5 side, the resin mass 12 filled in the filling part 11 and cured, and an engagement means 14 to engage the resin mass 12 with the filling part 11. The engagement means 14 is composed of a groove 14a formed on a cylindrical side 11b of the filling part 11 and a collar-like portion 14b forming a part of the resin mass 12 cured in the groove 14a, and prevents the resin mass 12 from getting out of the filling part 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is a push switch mounted on an electronic device such as a mobile phone, and a push switch that contacts a fixed contact by pressing a movable contact covered with a sheet member over the sheet member and elastically deforming the movable contact, and The present invention relates to a sheet with a movable contact that is a part of the push switch.

  In this type of push switch, the fixed contact is provided on the substrate. The movable contact is a dome-shaped member having elasticity, and is positioned on the substrate so as to cover the fixed contact. The movable contact is surrounded by a sheet-like spacer member, and the spacer member is fixed to the substrate. The sheet member is positioned over the movable contact and the spacer member. The top of the movable contact and the spacer member are affixed to the sheet member.

  When the movable contact is elastically deformed when coming into contact with the fixed contact, the operator is given a click feeling. The click feeling is given to the operator as a sharp and appropriate feel when the top of the movable contact is pressed, but is given to the operator as a dull inappropriate feel when the movable contact is pressed off the top. Or a feel that is not recognized as a click feeling. Therefore, a protrusion projecting in a direction opposite to the direction of the movable contact is provided on the portion of the sheet member positioned overlapping the top of the movable contact, and the pressing operation force transmitted from the key to the movable contact is applied to the top of the movable contact. There is something that I tried to focus on.

  The protrusion is made of a resin lump. This resin lump is obtained by placing a molten resin such as an ultraviolet curable resin in a bowl-shaped recess formed in the sheet member and curing it.

  For this type of push switch, see, for example, Patent Document 1.

  When manufacturing this type of push switch, it has a sheet member provided with an adhesive layer on one surface and a movable contact affixed to the sheet member by the adhesive layer, and has a fixed contact and a substrate. A sheet with no movable contact is treated as one part. By sticking the sheet with the movable contact to the substrate provided with the fixed contact, the movable contact and the spacer member can be easily provided on the substrate.

Tomi No.30211191

  When pushing and moving the movable contact through the sheet member is repeated, the adhesive force between the sheet member and the resin lump is weakened, and the resin lump is peeled off.

  The present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide a sheet with a movable contact and a push switch that can make it difficult to remove a resin lump constituting a protrusion from a sheet member. It is in.

  In order to achieve the above object, the present invention is configured as follows.

[1] A sheet with a movable contact according to the present invention includes a dome-shaped movable contact and a sheet member that covers and is adhered to the movable contact, and overlaps the top of the movable contact. A sheet with a movable contact provided on a portion of the sheet member to be projected in a direction opposite to the direction of the movable contact, wherein the projection is formed on the sheet member and the direction of the movable contact An indented filling portion, a resin mass filled and cured in the filling portion, and an engagement for engaging the inner surface of the filling portion and the resin mass to prevent the resin mass from coming out of the filling portion. And means.

  According to the present invention described in “[1]”, the resin lump is prevented from coming out of the filling portion by the engaging means, so that it is difficult to remove the resin lump from the sheet member.

[2] The sheet with a movable contact according to the present invention is the sheet with a movable contact according to “[1]”, wherein the engagement means is formed on an inner surface of the filling portion and intersects with a dent direction of the filling portion. It consists of the groove | channel recessed in the direction to make and a part of resin lump hardened | cured in this groove | channel.

  The sheet with a movable contact described in “[2]” has a groove on the inner surface of the filling portion and a part of the resin lump located in the groove when a force in the direction of coming out of the filling portion is applied to the resin lump. Is trapped, thereby preventing the resin mass from coming out of the filling portion.

[3] A sheet with a movable contact according to the present invention is the sheet with a movable contact according to “[1]”, wherein a gap is formed between the portion of the sheet member positioned around the filling portion and the portion of the movable contact. Is formed.

  In the seat with the movable contact described in “[3]”, when the movable contact is restored to the dome shape from the recessed state in the direction of the fixed contact, the sheet member is stretched to prevent the smooth restoration of the movable contact. Can be prevented.

[4] A push switch according to the present invention includes a sheet with a movable contact according to any one of “[1]” to “[3]”, a substrate, and a fixed contact provided on one surface of the substrate. The movable contact sheet is attached to the substrate with the movable contact and the fixed contact facing each other.

  According to the push switch described in “[4]”, since the sheet with the movable contact described in any one of “[1]” to “[3]” is included, it is difficult to remove the resin lump from the sheet member. can do.

  According to the present invention, as described above, it is possible to make it difficult to remove the resin mass constituting the protrusion from the sheet member. Therefore, it is possible to contribute to extending the life of the push switch and improving the reliability.

It is sectional drawing of the push switch which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view in which a key is omitted from the push switch shown in FIG. 1. FIG. 3 is a top view showing a plurality of push switches in the state shown in FIG. 2 integrated in a planar shape. It is sectional drawing which shows a state when the sheet | seat with a movable contact which concerns on one Embodiment of this invention is stored.

  A push switch and a sheet with a movable contact according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the push switch 1 has a substrate 2. On one surface of the substrate 2, a central fixed contact 3 and an annular fixed contact 4 positioned so as to surround the central fixed contact 3 are provided.

  The central fixed contact 3 is covered with a movable contact 5. The movable contact 5 is formed by plating a metal member formed in a dome shape with a highly conductive material, and has a dish-like portion 5a that swells away from the center fixed contact 3, and an edge of the dish-like portion 5a. And an annular portion 5b formed in the whole portion and having a divergent shape in the direction of the annular fixed contact 4. The annular portion 5 b is located in contact with the annular fixed contact 4. The movable contact 5 comes into contact with the central fixed contact 3 by elastic deformation with a concave top portion, that is, when the dish-shaped portion 5a is inverted in a state of swelling in the direction of the central fixed contact 3, and as a result, the movable contact 5 is annular with the central fixed contact 3 The fixed contact 4 is electrically connected through the movable contact 5.

  The movable contact 5 and the annular fixed contact 4 are surrounded by a sheet-like spacer member 6. The spacer member 6 is formed from, for example, PET (polyethylene terephthalate) which is an insulating material. The spacer member 6 is provided with an adhesive layer 6a formed by applying an adhesive, and the spacer member 6 is attached to the substrate 2 by the adhesive layer 6a. The movable contact 5 and the spacer member 6 are covered with a sheet member 7 on the surface opposite to the substrate 2, that is, the upper surface in FIG. The sheet member 7 is formed of, for example, PET (polyethylene terephthalate) which is an insulating material and has elasticity. An adhesive layer 7 a formed by applying an adhesive is provided on the entire surface of the sheet member 7 on the movable contact 5 and spacer member 6 side. The top of the movable contact 5 is attached to the sheet member 7 by the adhesive layer 7a. The spacer member 6 is also attached to the sheet member 7 by the adhesive layer 7a. The movable contact 5 is affixed to the sheet member 7 and the spacer member 6 is affixed to the substrate 2 in a state of being affixed to the sheet member 7, so that the movable contact 5 covers the central fixed contact 4 and the annular fixed contact. 4 is positioned in contact with 4.

  The sheet member 7 is covered with a sheet-like light guide member 9 on the surface opposite to the movable contact 5 and the spacer member 6 side. The sheet member 7 and the light guide member 9 are also attached with an adhesive.

  A protruding portion 10 that protrudes in a direction opposite to the direction of the movable contact 5 is provided on the portion of the sheet member 7 that is positioned so as to overlap the top of the movable contact 5. The protrusion 10 includes a filling portion 11 formed on the sheet member 7 and recessed in the direction of the movable contact 5, and a resin lump 12 filled and cured in the filling portion 11.

  The inner surface of the filling portion 11 is composed of an inner side surface 11a that extends substantially parallel to the dent direction of the filling portion 11 and a bottom portion 11b that is formed to spread flat in a direction substantially perpendicular to the dent direction, as a whole. It has a bottomed cylindrical shape.

  The resin block 12 is obtained by curing, for example, an ultraviolet curable resin. As a procedure for molding the resin mass 12, first, the filling portion 11 is filled with an ultraviolet curable resin (molten resin), and then the ultraviolet curable resin filled in the filling portion 11 is irradiated with ultraviolet rays to be cured. The procedure is taken.

  The protrusion 10 is provided with engagement means 14 for engaging the inner surface of the filling portion 11 with the resin mass 12. The engaging means 14 is a groove 14 a formed on the inner surface 11 a of the filling portion 11 and recessed in a direction intersecting the recessed direction of the filling portion 11, and a part of the resin mass 12 cured in the groove 14 a. It consists of a bowl-shaped part 14b. The groove 14a is formed at a position between the edge 11d of the opening 11c and the bottom 11b. As a forming procedure of the filling portion 11 having the groove 14a, first, the groove 14a was formed on the sheet member 7 by embossing, and then the inner surface 11a and the bottom 11b were formed by embossing. .

  The movable contact 5 is affixed to the sheet member 7 by an adhesive layer 7a at a top portion facing the bottom portion 11b of the filling portion 11 and a portion located on the outer peripheral side of the bottom portion 11b of the filling portion 11. As a result, an inclined portion 8 inclined from the edge 11 d of the filling portion 11 toward the substrate 2 is formed on the sheet member 7 between the portions where the movable contact 5 is attached. That is, the gap 13 is formed between the portion of the sheet member 7 located around the filling portion 11 and the movable contact 5.

  A key 16 (push button) is located opposite to the surface of the light guide member 9 located on the side opposite to the substrate 2 side. The key 16 and the protruding portion 10 are positioned to face each other with the light guide member 9 interposed therebetween. The key 16 has a pusher 16 a that protrudes in the direction of the protrusion 10. When the key 16 is pressed in the direction of the arrow P, the pusher 16a presses the movable contact 5 over the light guide member 9 and the protruding portion 10 while elastically deforming the light guide member 9 and the sheet member 7, thereby The movable contact 5 is reversed and contacts the central fixed contact 3. When the pressing operation force with respect to the key 16 is removed, the light guide member 9 and the sheet member 7 are restored, and the movable contact 5 is also restored from the inverted state and separated from the center fixed contact 3.

  When a plurality of push switches 1 are provided to be arranged in a plane on an electronic device such as a mobile phone, the plurality of push switches 1 are generally provided in the electronic device in a state of being integrated in a plane. is there. In the integration, a plurality of sets including the movable contact 5, the center fixed contact 3, and the annular fixed contact 4 share the substrate 2, the sheet member 7, and the light guide member 9 (FIG. 3). reference). The light guide member 9 guides light received from the end face therein, and emits light from a circular light emitting region 15 including the movable contact 5 in a top view. FIG. 2 is an enlarged view of the cross section of FIG. 3A-A.

  Further, the movable contact 5, the spacer member 6, and the light guide member 9 are attached to the sheet member 7, and the spacer member 6 is provided with the adhesive layer 6 a, that is, from the push switch 1 to the substrate 2 and the center fixed contact 3. Except for the annular fixed contact 4 and the key 16, a sheet 20 with a movable contact is formed. This sheet 20 with a movable contact is handled as one component when the push switch 1 is manufactured. By attaching the sheet 20 with the movable contact to the substrate 2 provided with the central fixed contact 3 and the annular fixed contact 4, the spacer member 6, the light guide member 9 and the movable contact 5 can be easily provided on the substrate 2. .

  As shown in FIG. 4, the sheet 20 with the movable contact is stored in a state where the entire surface opposite to the light guide member 9 is covered with the protective sheet member 21 before being attached to the substrate 2. The protective sheet member 21 is attached to the spacer member 6 by the adhesive layer 6a. The surface of the protective sheet member 21 on the side of the spacer member 6 is processed so that it can be peeled off while the adhesive layer 6 a remains on the spacer member 6 when the push switch 1 is manufactured.

  According to the push switch 1 and the sheet 20 with the movable contact according to the present embodiment, the following effects can be obtained.

  The movable contact-attached sheet 20 and the push switch 1 prevent the resin lump 12 from coming out of the filling portion 11 by the engaging means 14, making it difficult to remove the resin lump 12 from the sheet member. Thereby, it can contribute to the lifetime improvement and reliability improvement of the push switch 1. FIG.

  In the movable contact-attached sheet 20 and the push switch 1, the engaging means 14 includes a groove 14 a formed on the inner surface of the filling portion 11 and recessed in a direction intersecting the depression direction of the filling portion 11, and a bowl-shaped portion of the resin lump 12. 14b. That is, when a force in the direction of pulling out from the filling portion 11 is applied to the resin mass 12, the groove 14a on the inner surface of the filling portion 11 and the hook-like portion 14b located in the groove 14a are hooked, and thereby the filling portion It is possible to prevent the resin lump 12 from coming out of 11.

  In the sheet 20 with the movable contact and the push switch 1, the position of the groove 14a is set to a position between the edge 11d of the opening 11c and the bottom 11b. That is, the engaging means 14 can be provided without increasing the contact area of the protrusion 10 with respect to the movable contact 5, and the click feeling can be prevented from becoming dull with the provision of the engaging means 14.

  In the movable contact-attached sheet 20 and the push switch 1, a gap 13 is formed between the portion of the sheet member 7 positioned around the filling portion 11 and the portion of the movable contact 5 positioned around the top. . Accordingly, when the movable contact 5 is restored to the dome shape from the inverted state in which the movable contact 5 is recessed in the direction of the central fixed contact 3, it is possible to prevent the sheet member 7 from being stretched and hindering the smooth restoration of the movable contact 5.

DESCRIPTION OF SYMBOLS 1 Push switch 2 Board | substrate 3 Center fixed contact 4 Annular fixed contact 5 Movable contact 5a Dish part 5b Annular part 6 Spacer member 6a Adhesive layer 7 Sheet member 7a Adhesive layer 8 Inclined part 9 Light guide member 10 Projection part 11 Filling part 11a In Side surface 11b Bottom portion 11c Opening portion 11d Edge 12 Resin lump 13 Cavity 14 Engaging means 14a Groove 14b Gutter-shaped portion 15 Light emitting region 16 Key 16a Pusher 20 Sheet with movable contact 21 Protective sheet member

Claims (4)

A dome-shaped movable contact; and a sheet member that covers and is adhered to the movable contact, and the portion of the sheet member that is positioned to overlap the top of the movable contact A sheet with a movable contact provided with a protruding portion protruding in a direction opposite to the direction,
The protrusion is formed by engaging a filling portion formed on the sheet member and recessed in the direction of the movable contact, a resin lump filled and cured in the filling portion, and an inner surface of the filling portion and the resin lump. And an engaging means for preventing the resin mass from slipping out of the filling portion. In the sheet | seat with a movable contact of Claim 1,
The engaging means includes a groove formed on an inner surface of the filling portion and recessed in a direction intersecting with a recessed direction of the filling portion, and a part of a resin mass cured in the groove. A sheet with a movable contact. In the sheet | seat with a movable contact of Claim 1,
The sheet | seat with a movable contact characterized by the space | gap being formed between the part of the said sheet member located in the circumference | surroundings of the said filling part, and the part of the said movable contact. A sheet with a movable contact according to any one of claims 1 to 3, a substrate, and a fixed contact provided on one surface of the substrate,
The push switch according to claim 1, wherein the sheet with the movable contact is attached to the substrate with the movable contact and the fixed contact facing each other.

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