JP5696423B2 - Push switch, mounting board, and push switch mounting method - Google Patents

Description

  The present invention relates to a push switch, a mounting board, and a push switch mounting method used for various electronic devices.

  A push switch used in various small electronic devices such as a mobile phone is known as Patent Document 1 and the like. With the recent miniaturization of devices, such push switches are also required to be miniaturized.

  FIG. 8 is an exploded perspective view of the push-on switch (push switch) described in Patent Document 1. This push switch 100 has a box-shaped switch case 111 made of an insulating resin with an open top surface, a central fixed electrode 112 fixed at the center of the inner bottom surface of the opening, and two opposing parts centered on the central fixed electrode 112. A pair of outer fixed electrodes 113 fixed at the positions and a central portion accommodated in the switch case 111 so that the lower surface of the central apex portion 114A faces the central fixed electrode 112 with a predetermined distance upward. A dome-shaped movable electrode 114 that swells, and a substantially square cover sheet 115 made of an insulating film that has flexibility and covers the opening of the switch case 111 are provided.

  When the push switch 100 is pressed from above the cover sheet 115, the dome-shaped portion of the lower movable electrode 114 is pressed via the cover sheet 115, and when the predetermined pressing force is exceeded, the dome-shaped portion feels moderate. At the same time, the lower surface of the central apex 114A comes into contact with the central fixed electrode 112, and the outer fixed electrode 113 and the central fixed electrode 112 are electrically connected to each other via the movable electrode 114. On the other hand, when the operating force is removed, the dome-shaped portion is restored to the original state before pressing with a sense of moderation by the self-restoring force of the movable electrode 114, and at the same time, the non-conductive switch-off state is set.

Japanese Patent No. 4457918

  By the way, with recent downsizing of electronic devices, opportunities to carry these electronic devices are increasing, and waterproof performance is required for electronic devices. However, for example, in the conventional push switch 100 described in Patent Document 1, the waterproof performance of the switch alone is low, and it is necessary to have a waterproof structure on the housing side of the electronic device.

  That is, in the conventional push switch 100, the extended portions from the center fixed electrode 112 and the outer fixed electrode 113 serve as external connection terminals (external terminals) 112A and 113A, and the outer surfaces 111A and 111B facing the switch case 111. Each is derived from the lower end. The terminals 112A and 113A are bent upward from the root portion of the lead-out portion to have a J bent (substantially J-bend) shape. Therefore, the tips of the terminals 112A and 113A are formed so as to protrude outside the side surface of the switch case 111, and there is a problem that water can easily enter from the lead-out portions of the terminals 112A and 113A.

  Accordingly, the object of the present invention is to provide a push switch, a mounting board, and a push switch mounting method having high waterproof performance in order to solve the above-mentioned problems.

The above object of the present invention is to provide an insulating housing provided with a housing recess on the upper surface and a bottom surface attached to the mounting substrate;
A pair of fixed electrodes provided apart from each other in the receiving recess;
A dome-shaped elastic conductive member provided in the housing recess so as to face the fixed electrode;
A cover sheet closely attached to the upper surface of the insulating housing so as to cover the opening of the housing recess,
When the elastic conductive member is elastically deformed, the pair of fixed electrodes are electrically connected via the elastic conductive member,
The external terminal of the fixed electrode that is electrically connected to an external circuit is exposed only on the bottom surface of the insulating housing,
The push switch is characterized in that the outer surface of the push switch is covered with a sealing agent and sealed in a watertight manner.

  In the push switch having the above-described configuration, it is desirable that the sealant form a fillet on an outer peripheral portion of the push switch.

Another object of the present invention is to provide an insulating housing having a housing recess on the upper surface and a bottom surface attached to the mounting substrate, a pair of fixed electrodes provided apart from each other in the housing recess, and facing the fixed electrode. A dome-shaped elastic conductive member provided in the housing recess, and a cover sheet in close contact with the upper surface of the insulating housing so as to cover the opening of the housing recess, the elastic conductive member A push switch for conducting the pair of fixed electrodes through the elastic conductive member by elastic deformation;
A mounting board having a mounting surface to which the push switch is mounted;
An external terminal of the fixed electrode that is electrically connected to an external circuit provided on the mounting surface is exposed only on a bottom surface of the insulating housing;
This is achieved by a mounting substrate in which the outer surface of the push switch is covered with a sealant and is watertightly sealed.

Further, the above object of the present invention is to provide an insulating housing provided with a housing recess on the top surface and attached to the mounting substrate on the bottom surface,
A pair of fixed electrodes provided apart from each other in the receiving recess;
A dome-shaped elastic conductive member provided in the housing recess so as to face the fixed electrode;
A cover sheet closely attached to the insulating housing so as to cover the opening of the housing recess,
When the elastic conductive member is elastically deformed, the pair of fixed electrodes are electrically connected via the elastic conductive member,
The external terminal of the fixed electrode that is electrically connected to an external circuit is exposed only on the bottom surface of the insulating housing,
This is achieved by a push switch characterized in that the cover sheet covers the upper surface and the outer surface of the insulating housing and is watertightly sealed.

Another object of the present invention is to provide an insulating housing having a housing recess on the upper surface and a bottom surface attached to the mounting substrate, a pair of fixed electrodes provided apart from each other in the housing recess, and facing the fixed electrode. A dome-shaped elastic conductive member provided in the housing recess, and a cover sheet in close contact with the insulating housing so as to cover the opening of the housing recess, and the elastic conductive member is elastically deformed. A push switch in which the pair of fixed electrodes are conducted through the elastic conductive member,
A mounting board having a mounting surface to which the push switch is mounted;
An external terminal of the fixed electrode that is electrically connected to an external circuit provided on the mounting surface is exposed only on a bottom surface of the insulating housing;
The cover sheet covers the upper surface and the outer surface of the insulating housing attached to the attachment surface.

Another object of the present invention is to provide an insulating housing having a housing recess on the upper surface and a bottom surface attached to the mounting substrate, a pair of fixed electrodes provided apart from each other in the housing recess, and facing the fixed electrode. A dome-shaped elastic conductive member provided in the housing recess, and a cover sheet in close contact with the upper surface of the insulating housing so as to cover the opening of the housing recess, the elastic conductive member A push switch mounting method for mounting on a mounting surface of a mounting board a push switch in which the pair of fixed electrodes are conducted through the elastic conductive member by elastic deformation,
A mounting step of mounting the push switch on the mounting surface, wherein the external terminal of the fixed electrode that is electrically connected to an external circuit provided on the mounting surface is exposed only on the bottom surface of the insulating housing;
A sealing step of applying a sealant to the outer peripheral portion of the push switch, and sealing the space between the outer peripheral portion of the push switch and the mounting surface;
It is achieved by a push switch mounting method characterized by comprising:

According to the push switch of the present invention, the external terminal of the fixed electrode is exposed only on the bottom surface of the insulating housing. That is, an external terminal formed in a complicated shape such as a J bent shape or a gull wing shape unlike a conventional push switch does not protrude from the outer surface of the insulating housing.
Therefore, when the outer surface of the push switch is covered with the sealing agent, it is not necessary to apply the sealing agent to the entire external terminals that greatly protrude from the outer surface of the insulating housing, and the application workability does not deteriorate. Further, since the outer surface of the insulating housing has a simple outer shape, it is easy to ensure the adhesiveness of the sealing agent.
Therefore, the push switch according to the present invention can have high waterproof performance.

It is a fragmentary perspective view of the mounting substrate in which the push switch concerning one embodiment of the present invention was mounted. FIG. 2 is a cross-sectional view taken along the line II-II of the push switch illustrated in FIG. 1. It is a disassembled perspective view of the push switch shown in FIG. It is a figure which shows the push switch shown in FIG. 1, (a) is a top view, (b) is a bottom view, (c) is a side view. It is an expanded sectional view of the A section in the push switch shown in FIG. It is a bottom view of the push switch shown in FIG. It is a fragmentary perspective view of the mounting substrate in which the push switch concerning other embodiments of the present invention was mounted. It is a disassembled perspective view of the push switch which concerns on a prior art.

Hereinafter, a push switch, a mounting board, and a push switch mounting method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the mounting board 10 according to the present embodiment includes a push switch 1 according to the present embodiment, which will be described later, and a mounting board (for example, a printed wiring board) including a mounting surface 9a to which the push switch 1 is mounted. 9. In addition, on the attachment surface 9a of the attachment substrate 9, lead-out wiring (not shown) constituting an external circuit is formed.

  As shown in FIGS. 1 to 4, the push switch 1 of the present embodiment includes a housing recess 2 a on the upper surface 2 b, and the bottom surface 2 c is separated from the housing recess 2 a and the insulating housing 2 attached to the mounting substrate 9. The first fixed electrode 3 and the second fixed electrode 4 (a pair of fixed electrodes) provided in the housing recess 2a so as to face the first fixed electrode 3 and the second fixed electrode 4, and the opening The dome-shaped click spring (elastic conductive member) 6 disposed so as to be convex toward the surface side, and the upper surface 2b of the insulating housing 2 and the upper surface of the click spring 6 are protected by covering the opening of the housing recess 2a. The cover sheet 7 is in close contact with the upper surface 2 b of the insulating housing 2. Further, the outer peripheral portion (outer surface) 1a of the push switch 1 is covered with a sealing agent 5 such as an epoxy resin and is watertightly sealed.

  The insulating housing 2 is a thin box-shaped insulating resin member, and an accommodation recess 2a is formed on the upper surface 2b thereof. The accommodating recess 2a is formed in a substantially oval shape in plan view that is substantially the same as the outer shape of the click spring 6 so as to restrict the movement of the click spring 6 accommodated therein.

  As shown in FIGS. 2 and 3, the click spring 6 is a conductive metal member having a convex dome shape at the top and capable of elastic deformation. Further, both end portions of the click spring 6 are disposed in the housing recess 2a in a state of being in contact with the pair of contact terminals 4a of the second fixed electrode 4 exposed in the housing recess 2a.

In a normal state where no external load is applied to the click spring 6, the top of the click spring 6 is separated from the contact terminal 3 a of the first fixed electrode 3, and the first fixed electrode 3 and the second fixed electrode 4. And the push switch 1 is in an OFF state.
On the other hand, in a pressed state in which the top portion of the click spring 6 is pressed downward, the click spring 6 is elastically deformed so that the top portion of the click spring 6 contacts the contact terminal 3 a of the first fixed electrode 3, and the click spring 6 is interposed. Thus, the first fixed electrode 3 and the second fixed electrode 4 are brought into conduction, and the push switch 1 is turned on.

  The cover sheet 7 is a flexible insulating film provided on the click spring 6. When the top of the click spring 6 is pressed, the cover sheet 7 is also elastically deformed according to the deformation of the click spring 6. Further, the cover sheet 7 covers the opening of the housing recess 2a of the insulating housing 2, thereby preventing dust, moisture, etc. from entering the housing recess 2a of the insulating housing 2 from the outside, and the click spring 6 or the first fixing. Corrosion of the electrode 3 and the second fixed electrode 4 is prevented. The cover sheet 7 can be formed from a resin such as polyimide. The back surface of the cover sheet 7 is bonded to the upper surface 2b of the insulating housing 2 through an adhesive layer.

  Further, an operation projection 8 is formed at a position substantially corresponding to the contact terminal 3 a of the first fixed electrode 3 on the substantially central portion of the surface of the cover sheet 7. The operation protrusion 8 is provided so as to protrude from the surface of the cover sheet 7 to the side opposite to the click spring 6.

When the push switch 1 is turned on by pressing the top of the click spring 6, the top of the click spring 6 is passed through the tip of the operation protrusion 8 having a small area by using a pressing member having a large pressing area such as a button. By pressing, the pressing force by the pressing member can be concentrated and a large stress can be applied to the top of the click spring 6.
Therefore, even if the pressing member is lightly pressed, the stress is concentrated by the operation projection 8, so that the click spring 6 can be reliably elastically deformed. Further, even if the relative position between the pressing member and the push switch 1 is slightly shifted, the pressing operation can be surely realized.

  As shown in FIGS. 2 to 6, the first fixed electrode 3 and the second fixed electrode 4 are respectively exposed to the receiving recess 2 a and contact terminals 3 a and 4 a that can contact the click spring 6, and the bottom surface 2 c of the insulating housing 2. And external terminals 3b and 4b connected to the lead wiring provided on the mounting substrate 9 so as to be exposed to the mounting substrate 9 only.

  The first fixed electrode 3 is a substantially T-shaped metal member in a top view. The first fixed electrode 3 is provided at a contact terminal 3 a provided so as to be exposed at the center of the bottom surface of the housing recess 2 a, and at an extended portion extending from the contact terminal 3 a and entering the insulating housing 2. A pair of external terminals 3b exposed to 2c, and is insert-molded in the insulating housing 2.

The contact terminal 3a is formed in a convex shape on the upper surface side of the insulating housing 2, and is configured such that when the click spring 6 is pressed, the top of the click spring 6 reliably contacts the contact terminal 3a. .
The external terminal 3b is formed in a convex shape on the bottom surface side of the insulating housing 2, and when the push switch 1 is mounted on the mounting substrate 9, the external terminal 3b is close to the lead wiring provided on the mounting surface 9a. Is configured to do. That is, the protruding height of the external terminal 3 b is set so that the tip does not protrude from the bottom surface 2 c of the insulating housing 2.

  The second fixed electrode 4 is a substantially U-shaped metal member in a top view. The second fixed electrode 4 is provided at a pair of contact terminals 4 a provided so as to be exposed in a peripheral region on the bottom surface of the housing recess 2 a and a continuous portion extending from each contact terminal 4 a and entering the insulating housing 2. A pair of external terminals 4 b exposed on the bottom surface 2 c of the insulating housing 2 are inserted and molded into the insulating housing 2.

The contact terminal 4a is formed in a convex shape on the upper surface side of the insulating housing 2, and is configured so that the end portion of the click spring 6 is surely in contact with the contact terminal 4a.
The external terminal 4b is formed in a convex shape on the bottom surface side of the insulating housing 2, and when the push switch 1 is mounted on the mounting substrate 9, the external terminal 4b is close to the lead-out wiring provided on the mounting surface 9a. Is configured to do. That is, the protruding height of the external terminal 4 b is set so that the tip does not protrude from the bottom surface 2 c of the insulating housing 2.

The external terminal 3b and the external terminal 4b of the present embodiment are formed by simply forming a predetermined portion of the first fixed electrode 3 and the second fixed electrode 4 made of a flat plate-shaped conductive member having a predetermined outer shape into a convex shape. Is done. Therefore, the terminal shapes of the first fixed electrode 3 and the second fixed electrode 4 have a simple structure, and it is not necessary to use a complicated molding die, so that the manufacturing cost of the first fixed electrode 3 and the second fixed electrode 4 can be reduced. Can be lowered.
Since the first fixed electrode 3 and the second fixed electrode 4 are integrally formed with the insulating housing 2 by insert molding, even if the push switch 1 is heated during soldering, the first fixed electrode 3 is formed. There is little possibility that the second fixed electrode 4 is deformed.

  Further, the external terminal 3b and the external terminal 4b are formed in a spherical shape convex on the bottom surface side, and a space having an inclined surface (concave surface) having an acute angle with the mounting surface 9a of the mounting substrate 9 is provided. Form. When the push switch 1 is attached to the attachment substrate 9, as shown in FIG. 5, a solder fillet P having a large solder adhesion area may be formed in a space having an inclined surface having an acute angle. As a result, the soldering strength is improved. Even if a force in the lateral direction (direction parallel to the bottom surface 2c of the insulating housing 2) acts on the insulating housing 2, the annular solder fillet P having a concave surface formed around the external terminals 3b and 4b is Since the force is supported, there is little possibility that the insulating housing 2 falls off the mounting substrate 9.

  Therefore, the mounting substrate 10 including the push switch 1 according to the present embodiment includes a lead-out wiring provided on the mounting surface 9a of the mounting substrate 9, and external terminals 3b and 4b exposed only on the bottom surface 2c of the insulating housing 2. Are soldered and electrically connected to each other to mount the push switch 1 on the mounting surface 9a, and the outer peripheral portion 1a of the push switch 1 is coated with the sealant 5 on the outer peripheral portion 1a of the push switch 1. And a sealing step for watertight sealing between the mounting surface 9a and the mounting surface 9a.

As shown in FIGS. 3, 4 and 6, the external terminal 3 b and the space defined between the external terminal 4 b and the mounting surface 9 a of the mounting substrate 9 are formed on the bottom surface 2 c of the insulating housing 2 in the push switch 1. Is provided with a recess 2 e for communicating with the outer surface 2 d of the insulating housing 2.
Therefore, when soldering in the mounting process, it is possible to observe whether or not the solder fillet P is well formed in the space from the side of the insulating housing 2. Therefore, since the quality of soldering can be easily confirmed from the side of the insulating housing 2, the efficiency of non-defective product inspection can be improved. Of course, the shape of the recess 2e may be any shape as long as the space communicates with the outside of the side of the housing 1.

Further, according to the push switch 1 according to the present embodiment, the external terminals 3 b and 4 b of the first fixed electrode 3 and the second fixed electrode 4 are exposed only on the bottom surface 2 c of the insulating housing 2. Further, on the outer surface 2d of the insulating housing 2, the first fixed electrode 3 and the second fixed electrode 4 which are insert products are insert-molded in the insulating housing 2, and are used for supplying a hoop into the mold. The cut part 4d of the trace which cut | disconnected the part only protrudes slightly.
That is, unlike the conventional push switch 100 shown in FIG. 8, the terminals 112 </ b> A and 113 </ b> A formed in a complicated J bent shape do not protrude from the outer surface 2 d of the insulating housing 2.

Therefore, when the outer peripheral portion 1a of the push switch 1 is covered with the sealing agent 5 in the sealing process, it is not necessary to apply the sealing agent 5 to the entire external terminal that protrudes greatly from the outer surface of the insulating housing, and the application workability does not deteriorate. . Further, since the outer surface 1a of the insulating housing 2 has a simple outer shape, the applied sealant 5 can easily form a fillet on the outer peripheral portion of the push switch 1 as shown in FIG. It is easy to ensure the adhesion of the sealant 5.
Therefore, the push switch 1 and the mounting substrate 10 according to the present invention can have high waterproof performance by covering the outer peripheral portion 1 a of the push switch 1 with the sealant 5.

In the above embodiment, the push switch 1 is mounted on the mounting surface 9a of the mounting substrate 9 in the mounting process, and then the outer peripheral portion 1a of the push switch 1 is covered with the sealant 5 in the sealing process. The present invention is not limited to this.
For example, the waterproof performance of the push switch 1 itself can be enhanced by covering the outer peripheral portion 1a of the push switch 1 before being mounted on the mounting substrate 9 with the sealing agent 5 and watertight sealing. In this case, a sealant 5 is used in advance by using a soft sealant or by applying the sealant 5 to the outer peripheral portion 1a of the push switch 1 placed on the carrier tape to form a fillet. The waterproofness of the gap with the mounting surface 9a when the push switch 1 provided with is mounted on the mounting substrate 9 can also be secured.

FIG. 7 is a partial perspective view of the mounting board 20 on which the push switch 21 according to another embodiment of the present invention is mounted.
The mounting board 20 includes a push switch 21 and a mounting board 9 having a mounting surface 9a to which the push switch 21 is mounted. The push switch 21 according to the present embodiment has the same configuration except that the cover sheet 27 is used instead of the cover sheet 7 in the push switch 1 according to the above-described embodiment. Detailed description will be omitted.

The cover sheet 27 according to the push switch 21 of the present embodiment is bonded to the upper surface 2b and the outer surface 2d of the insulating housing 2 via an adhesive layer on the back surface, so that the upper surface 2b and the outer surface 2d of the insulating housing 2 are bonded to each other. It is covered with watertight seal.
That is, the external terminals 3b and 4b of the first fixed electrode 3 and the second fixed electrode 4 are exposed only on the bottom surface 2c of the insulating housing 2, and are complicated as in the conventional push switch 100 shown in FIG. The terminals 112 </ b> A and 113 </ b> A formed in the J bent shape do not protrude from the outer surface 2 d of the insulating housing 2.

  Therefore, when the cover sheet 27 is bonded to the upper surface 2b and the outer surface 2d of the insulating housing 2, the external terminals that protrude greatly from the outer surface of the insulating housing do not hinder the bonding workability. In addition, since the outer surface 2d of the insulating housing 2 has a simple outer shape, the cover sheet 27 can be easily bonded to the outer surface 2d, so that the adhesiveness of the cover sheet 27 can be easily ensured.

Further, the cover sheet 27 may be bonded in advance to the insulating housing 2 before being mounted on the mounting board 9 to improve the waterproof performance of the push switch 100 itself. The waterproof performance of the mounting substrate 20 may be improved by bonding to the surface 9a.
Therefore, the push switch 21 and the mounting substrate 20 according to the present invention can have high waterproof performance by covering the outer peripheral portion of the insulating housing 2 with the cover sheet 27.

The constituent members such as the insulating housing, the fixed electrode, the elastic conductive member, the cover sheet, the sealant, and the mounting substrate according to the push switch of the present invention are not limited to the configuration of each of the above embodiments. It goes without saying that various forms can be adopted based on the purpose.
For example, in the above-described embodiment, the first fixed electrode 3 having a substantially T shape and the second fixed electrode 4 having a substantially U shape in top view are used, but the external terminal is exposed only on the bottom surface of the insulating housing. If it exists, the shape of the fixed electrode is not limited to this, and can be various shapes.
Moreover, as a sealing agent, various sealing materials can be used irrespective of a soft sealing material and a hard sealing material, if it has heat resistance and can be apply | coated.

DESCRIPTION OF SYMBOLS 1 Push switch, 2 insulation housing, 2a accommodation recessed part, 2b upper surface, 2c bottom face, 2d outer surface, 2e recessed part, 3rd 1st fixed electrode (fixed electrode), 4th 2nd fixed electrode (fixed electrode), 3a, 4a Contact terminal 3b, 4b External terminal, 5 Sealant, 6 Click spring (elastic conductive member), 7 Cover sheet, 9 Mounting board, 9a Mounting surface, P Solder fillet

Claims (6)

An insulating housing having a housing recess, a bottom surface attached to the mounting substrate, and an outer surface intersecting the bottom surface;
A first contact terminal disposed in the receiving recess;
A second contact terminal disposed in the receiving recess;
An elastic conductive member disposed in the housing recess and elastically deformed by being pressed to conduct the first contact terminal and the second contact terminal;
An insulating cover arranged to cover the receiving recess;
A first external terminal electrically connected to the first contact terminal;
A second external terminal electrically connected to the second contact terminal;
A seal part for watertight sealing by covering the outer surface;
With
A first recess and a second recess are formed on the bottom surface;
The first external terminal is disposed at a position facing the cover in a direction orthogonal to the bottom surface without protruding from the bottom surface in the first recess , and is inclined at an acute angle with respect to the bottom surface. It has a solder receiving surface,
The second external terminal is disposed in a position facing the cover in a direction orthogonal to the bottom surface without protruding from the bottom surface in the second recess , and is inclined at an acute angle with respect to the bottom surface. Having a solder receiving surface,
Push switch. The first recess and the second recess communicate with the outer surface, respectively.
The push switch according to claim 1. The seal portion is a part of a cover sheet that covers the housing recess so as to face the elastic conductive member.
The push switch according to claim 1 or 2. A push switch according to any one of claims 1 to 3,
A mounting substrate having a mounting surface;
With
The bottom surface of the push switch is attached to the mounting surface;
Mounting board. The seal portion is bonded to the mounting surface.
The mounting substrate according to claim 4. An insulating housing having an accommodating recess, a bottom surface, and a side surface intersecting the bottom surface;
A first contact terminal disposed in the receiving recess;
A second contact terminal disposed in the receiving recess;
An elastic conductive member disposed in the housing recess and elastically deformed by being pressed to conduct the first contact terminal and the second contact terminal;
An insulating cover arranged to cover the receiving recess;
A first external terminal electrically connected to the first contact terminal;
A second external terminal electrically connected to the second contact terminal;
With
A first recess and a second recess are formed on the bottom surface;
The first external terminal is disposed at a position facing the cover in a direction orthogonal to the bottom surface without protruding from the bottom surface in the first recess , and is inclined at an acute angle with respect to the bottom surface. It has a solder receiving surface,
The second external terminal is disposed in a position facing the cover in a direction orthogonal to the bottom surface without protruding from the bottom surface in the second recess , and is inclined at an acute angle with respect to the bottom surface. Having a solder receiving surface,
Preparing a push switch;
Preparing a mounting substrate having a mounting surface;
Attaching the bottom surface of the push switch to the attachment surface of the attachment substrate;
Providing a sealing portion so as to watertightly seal the outer surface of the push switch;
With
How to implement a push switch.

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