JP3046781B2 - Push-on switch - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-on switch. 2. Description of the Related Art Conventionally, as shown in FIG. 4, fixed contacts 2 and 2 are formed on a substrate 1 and a movable contact 3 is held on the substrate 1 at a predetermined interval above the fixed contacts 2. There has been proposed a push-on switch in which a cover member 4 having a dome portion 4a made of a material having elasticity is fixed. In this switch, when a pressing force is applied from above the dome portion 4a, the dome portion 4a is deformed, and the movable contact 3 comes into contact with the fixed contacts 2 and 2, and electrical conduction between the fixed contacts is performed. When the pressing force applied to the dome portion 4a is released, the dome portion 4a returns to its original state by its own elastic force, and the electrical conduction between the fixed contacts 2 is interrupted. In the conventional push-on type switch, there is a problem that there is almost no click feeling because the movable contact 3 and the fixed contacts 2 and 2 are merely in surface contact. Therefore, the conventional switch has a problem that the operator repeatedly performs the switch operation because there is no click feeling. Therefore, in a board provided with a push-on switch disclosed in Japanese Utility Model Application Laid-Open No. 58-150230, a center contact and an end contact are formed on an insulating board, and the contact points away from the insulating board. Adopts a switch structure in which a tact metal plate having a dish-shaped portion that can be inverted and curved so as to protrude is placed on an insulating substrate so that a part of its outer peripheral edge abuts the corresponding end contact. To get a click feeling. And in this conventional board,
An insulating cover member covering the surface of the tact metal plate is fixed to the insulating substrate by a fitting structure. In addition, for the purpose of positioning each tact metal plate and the purpose of preventing the tact metal plate from moving, a through hole is formed in the substrate, and a protrusion provided on the insulating cover member is fitted into the through hole, and the tact time is reduced. The metal plate is positioned and the tact metal plate is prevented from moving.
However, the insulation cover member is fixed to the board with a fitting structure.
Then, to prevent the tact metal plate from positioning and moving,
Form a through hole in the substrate and form a protrusion on the insulating cover member.
Need to be implemented. Accordingly, Japanese Utility Model Publication No. Sho 60-26422 discloses
Tact metal plate like push-on switch
Fix the insulating cover member covering the surface of the board with the adhesive
The structure was proposed. [0006] However, the conventional program
It is said that the click feeling is small with the switch on type
There was a problem. An object of the present invention is to provide a substrate having a push-on switch that can solve the above-mentioned problems. [0008] The push-on type of the present invention
The switch has a central contact and an end contact formed on an insulating substrate , a jumper wire is connected to the central contact, and the switch is capable of inverting operation and protrudes away from the insulating substrate. tact metal plate having is disposed on the insulating substrate so as to be in contact with the end contacts, the insulating cover member covering the surface of the tact metal plate that is <br/> adhesively secured to the insulating substrate. When the insulation cover member to affix <br/> an adhesive to the substrate, yet positions the tact metal plate can you to block its movement. Therefore, it is not necessary to form a hole in the substrate for positioning and preventing movement of the tact metal plate. In addition, since it is not necessary to use an expensive insulating cover member having a projection for positioning and preventing movement of the tact metal plate, the cost can be reduced. In the present invention
Is insulated above the jumper wire located below the tact metal plate
An overcoat made of a material is formed. And Obako
The thickness of the plate is determined so that the tact metal plate is inclined. This
The center contact and the end contact during non-operation.
There can not only prevent a short-circuit electrically via a tact metal plate, until Runode can tilt the tact metal plate by the thickness of the overcoat, dish This inclination is in contact with the central portion contact Increases, the amount of deformation of the dish-shaped portion increases, and the click feeling is improved. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of an embodiment in which the present invention is applied to a membrane switch. In FIG. 1, reference numeral 10 denotes a substrate having an insulating property, and a flexible substrate having flexibility may be used depending on the application. Substrate 10
As shown in FIG. 2, a central contact 20a, an end contact 20b, a jumper wire 20c, and the like are formed using a conductive paint such as copper foil, silver paint, or carbon. As the conductive paint, it is preferable to use an epoxy resin-based, phenolic resin-based, melamine resin-based, or polyimide resin-based paint containing a conductive powder such as silver or carbon. The central contact 20a is
Through-hole conductor 20e provided through substrate 10
The electrode 20f is formed at the other end of the through-hole conductor 20e. Jumper wire 2
An overcoat 20d is formed on 0c using an appropriate material such as an epoxy resin. Due to the presence of the overcoat 20d, the flange portion 3 of the tact metal plate 30
In the state where 0b rides, the tact metal plate 30 is inclined by the thickness of the overcoat. Due to this inclination, the distance until the dish-shaped portion comes into contact with the center contact increases. In the drawings, the thickness of the contacts 20a and 20b is exaggerated for easy understanding. In FIG. 1 and FIG. 3, reference numeral 30 denotes a dish-shaped portion 30a which is curved so as to protrude in a direction away from the substrate 10 and which can be inverted, and is formed continuously with the outer peripheral edge of the dish-shaped portion 30a. It is a tact metal plate comprising a flange 30b. The tact metal plate 30 is placed on the substrate 10 such that the outer peripheral edge of the dish-shaped portion 30a and the flange portion 30b always contact the end contact 20b. The end of the flange portion 30b can be soldered to the end contact 20b to facilitate positioning, but in this case, the soldering is performed to such an extent that the deformation of the dish portion 30a is not hindered. The outer peripheral edge of the dish 30a, that is, the flange 30
b and the connecting portion between the dish portion 30a have a curved surface or roundness 3
0e is formed. Further, a through hole 30c is formed in the center of the dish-shaped portion 30a, and a curved surface or roundness 30d is also provided on the inner peripheral portion of the through hole 30c. The roundness 30d of the inner peripheral portion of the through hole 30c is obtained by, for example, fixing the tact metal plate 30 having the through hole formed therein to a jig, inserting a punch having a sharp end into the through hole, pushing up, and performing drawing. It is formed. Furthermore, the dish-shaped portion 30a
At the position near the flange portion 30b, elongated through holes 30f and 30g extending in the circumferential direction are formed. When forming these through-holes 30f and 30g, before forming the dish-shaped portion 30a, the through-holes 30f and 30g are previously placed at predetermined positions on the flat metal plate which is the material of the tact metal plate.
0 g is formed by punching. The through-holes 30c, 30f and 30g are formed by
When it is deformed by the pressing force in the direction toward zero, it has a function of releasing air in a space formed between the dish-shaped portion 30a and the substrate 10 from the space. Reference numeral 40 denotes an insulating cover member made of, for example, rubber, polyester, polyethylene terephthalate, or the like, having insulating properties, flexibility, and elasticity. At least it is fixed to the substrate 10 using an adhesive so as to cover the surface. The flange portion 30b and the dish-shaped portion 30a are not adhered to the insulating cover member 40, and in this embodiment, between the insulating cover member 40 and the dish-shaped portion 30a in a state where the dish-shaped portion 30a is not deformed. A small gap or space g is partially formed. Although only one switch is shown in FIG. 1, a plurality of switches having the structure shown in FIG. 1 are provided on the substrate 10 at predetermined intervals. When the insulating cover member is fixed to the substrate 10 with an adhesive, there is no need to provide holes or the like for positioning or preventing movement of the substrate 10 as in the related art. Can be raised. In the present embodiment, the finger can be pressed directly from above the insulating cover member 40, but if necessary, the insulating cover member 4 can be pressed.
A flat pressing member 50 having flexibility as shown by a dashed line can be provided on the zero. When the switch operation is performed, the dish-shaped portion 30
The center part of a is pressed with a finger from above the insulating cover member 40. At the stage of applying the pressing force, the plate-shaped portion 30a and the substrate 1
Since the air in the space formed between 0 and 0 mainly passes through the through holes 30f and 30g into the gap g, the dish-shaped portion 30a is easily deformed. When the dish 30a is deformed, a clear click feeling is transmitted to the fingertip of the operator. When the operator releases his / her finger, the dish-shaped portion 30a performs a reversing operation and returns to the state shown in FIG. At this time, the air in the gap g passes through the through holes 30c, 30f and 30g and returns to the space formed between the dish 30a and the substrate 10, so that the dish 30a is quickly returned to its original state. Return to. In the above embodiment, the dish-shaped portion 30a
The rounded portions 30d and 30e are formed between the outer peripheral edge of the dish-shaped portion 30a even when the pressing operation is performed and the tact metal plate 30 is deformed. In addition, it is possible to prevent the end contact 20b and the center contact 20a from being scraped by the peripheral portion of the through hole 30c, thereby preventing the occurrence of poor conductivity. In this embodiment, the dish-shaped part of the tact metal plate is
When the pressing force is applied to deform the dish, the air in the space formed between the dish and the substrate is moved into the space formed between the dish and the insulating cover member. A through hole or cutout is formed so that the air in the space formed between the dish and the board does not hinder the dish, and the dish-shaped part of the tact metal plate is smoothly applied without applying a large pressing force. Can be transformed into In the above embodiment, the tact metal plate 30
Is used having a flange portion 30b as
A tact metal plate having only the dish portion 30a may be used. In this case, a notch of an appropriate shape may be formed on the outer peripheral edge of the dish-shaped portion, and air may be vented from the space formed between the dish-shaped portion and the substrate. Further, the position of the through hole or the notch for venting air may be anywhere as long as it does not hinder the deformation operation of the tact metal plate, and is not limited to the above embodiment. According to the present invention, the thickness of the overcoat
Only the tact metal plate can be tilted, so this tilt
The distance between the dish and the center contact
This increases the amount of deformation of the dish and increases the
The feeling of the lock becomes good.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing one embodiment of the present invention. FIG. 2 is a partial perspective view showing one embodiment of a substrate used in the embodiment of FIG. FIG. 3 is a plan view of a tact metal plate used in the embodiment of FIG. FIG. 4 is a cross-sectional view showing a configuration of a conventional switch. [Description of Signs] 10 Insulating substrate 20a Central contact 20b End contact 30 Tact metal plate 30a Dish 30b Flange 30c, 30f, 30g Through hole 40 Insulating cover member

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yozo Ohara 3158 Shimookubo, Osawanomachi, Kamishinkawa-gun, Toyama Prefecture Inside Hokuriku Electric Industry Co., Ltd. 58-150230 (JP, U) JP-A 61-100845 (JP, U) JP-B Hei 1-28446 (JP, B2) JP-B 60-24422 (JP, Y2) JP-B 62-17944 (JP, U.S.A.) Y2) (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 13/52 H01H 13/48

Claims (1)

(57) [Claims] A jumper wire having a center contact and an end contact formed on an insulating substrate and connected to the center contact on the insulating substrate
Formed on the insulating substrate so that a tact metal plate having a dish-shaped portion capable of reversing operation that is curved so as to protrude in a direction away from the insulating substrate is in contact with the end contact. A push-on switch in which an insulating cover member covering the surface of the tact metal plate is fixed to the insulative substrate with an adhesive, wherein the jumper wire is located below the tact metal plate.
An overcoat made of an insulating material is formed, and the thickness of the overcoat is such that the tact metal plate is inclined.
A push-on switch characterized by the following .