JP2931546B2 - Push-on switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-on switch.

[0002]

2. Description of the Related Art Recently, with the miniaturization of electronic products, small and thin push-on switches that can be directly assembled on a substrate without special cases have been used. In these switches, a tact metal plate having a center contact and an end contact formed on an insulating substrate and having a dish-shaped portion capable of reversing operation, which is curved so as to protrude in a direction away from the substrate, is formed by dishing. It is arranged on the substrate so that a part of the peripheral portion of the portion comes into contact with an end contact provided on the substrate.
In order to hold the tact metal plate at a predetermined position on the substrate, an insulating cover member is fixed to the substrate so as to cover the tact metal plate. In this switch, when the tact metal plate is pressed from the outside of the insulating cover member, the substantially central portion of the tact metal plate comes into contact with the center contact, and the center contact and the end contact are brought into a conductive state. A well-known example of this type of switch is disclosed in Japanese Utility Model Laid-Open Publication No. 1-100333. However, in this switch, although the insulating cover member is fixed to the substrate, the tact metal plate is held at a predetermined position by a structure that merely covers the tact metal plate, so that the tact metal plate moves. Therefore, there is a problem that the switch operation becomes uncertain.

Accordingly, a technique has been proposed in which a tact metal plate and an insulating cover member are joined via an adhesive.

[0004]

However, when the tact metal plate and the insulating cover member are joined via an adhesive, the tact metal is placed on the overcoat formed on the jumper wire connected to the center contact. When the click feeling is increased by increasing the distance between the center contact and the tact metal plate by contacting a part of the peripheral portion of the plate, the reversal operation of the tact metal plate increases, and the tact metal The adhesive provided between the plate and the insulating cover member becomes difficult to exhibit the bonding function (that is, easily peels off), causing a problem that the tact metal plate easily moves.

An object of the present invention is to provide a push-on switch which is to prevent movement of the tact metal plate allow reliably switch operation.

Another object of the present invention is to provide a push-on type switch capable of causing the insulating cover member to follow the deformation of the tact metal plate when the insulating cover member and the tact metal plate are joined with an adhesive. It is in.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to an insulating substrate having a center contact, an end contact, and a jumper wire extending from the center contact, and an overhang made of an insulating material formed on the jumper wire. A reversing operation in which a coat and a part of a peripheral portion are arranged on a substrate so as to abut against an end coat and an overcoat formed on a jumper line, and are curved so as to protrude in a direction away from the substrate. tact metal plate having a dish possible, comprising an insulating cover member fixed to the substrate tact metal plate so as to cover the tact metal plate to retain in position on the insulating substrate, insulation When a dish-shaped portion of the tact metal plate is pressed from the outside of the cover member, a substantially central portion of the dish-shaped portion is brought into contact with the center contact, and the center contact and the end contact are connected to each other. And In the present invention, in order to solve the above problems,
Place the insulating cover member on the top of the tact metal plate
The entire surface is joined, and the insulating cover member is further
Is also bonded via an adhesive. At least that caused to follow the deformation of the deformable insulating cover member tact metal plate at a portion corresponding to the tact metal plate of the insulating cover member 2
The book slits are formed so as to be arranged at predetermined intervals .

[0008] The tact metal plate may be composed only of a dish-shaped portion, or may have a flange portion outside the dish-shaped portion.

[0009] As in the present invention, at least two pickpocket to deformation of the tact metal plate that is follow the deformation of the insulation cover member
When the slots are formed at predetermined intervals,
The part of the insulating cover member sandwiched between the
Will be higher. Therefore, the tact metal plate and the insulating cover member are joined via an adhesive, and a part of the periphery of the tact metal plate is brought into contact with the overcoat formed on the jumper wire to increase the click feeling. Even if
An insulating cover member can be reliably follow the tact metal plate, it is possible to reliably perform a switch operation. In addition, the insulating cover member and the tact metal plate are
Flux and dust from the slits
No dust or the like enters.

[0010] In the present invention, you fully joining the upper surface of the tact metal plate via an adhesive to the insulation cover member
Therefore , even when the tact metal plate is greatly deformed, the tact metal plate can be reliably held at a predetermined position. The Runode be bonded via the adhesive against the insulating substrate an insulating cover member, not only the mounting is facilitated to the insulating substrate of the insulating cover member, thereby also moving the prevention of the insulating cover member.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1A is a schematic side view when the push-on switch of one embodiment of the present invention is used in a portable stereo volume control circuit, and FIG. 1B is a schematic rear view thereof. . The FIG. 2 (A) Ri A-A line sectional view der of FIG. 1 (B), FIG. 2 (B) sectional view along line B-B der shown in FIG. 1 (B)
You . FIG. 3 is a plan view of a single switch shown using imaginary lines to explain the structure of the switch. In these figures, reference numeral 1 denotes a circuit board having an insulating property. Note that a flexible substrate having flexibility may be used. A predetermined circuit pattern is formed on the substrate 1 using a conductive paint such as copper foil, silver paint, or carbon. Although a circuit pattern is not shown in FIGS. 1A and 1B, as shown in FIGS. 2 and 3, the circuit pattern includes a contact pattern of a switch.
2 and 3, reference numeral 2 denotes a center contact, reference numeral 3 denotes an end contact, and reference numerals 4a and 4b denote jumper wires. An overcoat 5 is formed on the jumper wire 4b connected to the center contact 2 using an appropriate insulating material such as epoxy resin. In this embodiment, the thickness of the overcoat 5 is set to 5
The thickness is about 0 μm, which is about five times the average overcoat thickness (about 10 μm) used in a known switch. When a part of a tact metal plate, which will be described later, is placed on the thick overcoat 5, the click feeling increases. In FIG. 2 and FIG. 3, each part is somewhat exaggerated for easy understanding.

Reference numeral 6 denotes a tact metal plate formed of only a reversible dish-shaped portion curved so as to protrude in a direction away from the substrate 1. The tact metal plate 6 is placed on the substrate 1 such that a part of the peripheral edge 6 a is always in contact with the end contact 3. Reference numeral 7 denotes an insulating cover member having insulating properties and flexibility.
It can be formed using a sheet or the like. In this embodiment, a flat polyester sheet cut according to the circuit pattern formed on the substrate 1 is used as the insulating cover member 7. In order to facilitate positioning during assembly, it is preferable to use a transparent or translucent insulating cover member 7. In the present embodiment, two slits 8, 8 are formed in a portion corresponding to the tact metal plate 6 of the insulating cover member 7 so as to be arranged at a predetermined interval, and both ends of the slit 8 are tact. The metal plate 6 extends to a position beyond the peripheral edge 6a. 2 and 3, the gap width of the slits 8 is exaggerated, but these slits 8 are formed by cutting the insulating cover member 7 with a cutting tool. It is.

An adhesive 9 is applied to the back surface of the insulating cover member 7, and the insulating cover member 7 and the tact metal plate 6 are joined to each other via the adhesive 9. The pressure-sensitive adhesive 9 may be any as long as it can adhere to the deformation of the insulating cover member 7 and the tact metal plate 6 to a certain extent without being cured and having tackiness and holding power. In this embodiment, FS is used as the adhesive 9.
An acrylic pressure-sensitive adhesive sold by K Corporation under the trade name of PL SIN was used. This pressure-sensitive adhesive is excellent in transparency, and re-joins to the joined object when a predetermined pressing force is applied again even after peeling.

The two slits 8, 8 are provided in the tact metal plate 6
The deformation of the insulating cover member 7 follows the deformation of the insulating cover member 7, and is provided as a deformation promoting groove for holding the tact metal plate at a predetermined position. The portion 7a of the insulating cover member 7 sandwiched between the two slits 8, 8 has a structure in which both ends are fixed to the substrate 1 with an adhesive 9, and has a high degree of freedom in deformation. Therefore, when the tact metal plate 6 is pressed and deformed, when the adhesive force or the holding force of the adhesive 9 is not so large, or when the holding force of the adhesive 9 is reduced due to aging, the outside of the slit 8 is formed. Even if the joint between the portion 7b of the insulating cover member 7 and the tact metal plate 6 may come off, the connection between the portion 7a and the tact metal plate 6 hardly comes off. In particular, as in the present embodiment, when the both ends of the slit 8 are sufficiently extended to positions beyond the peripheral edge 6a of the tact metal plate 6, the deformation of the portion 7a is facilitated. In addition, the air in the space formed between the tact metal plate 6 and the substrate 1 can be evacuated to the outside through a part of the slit 8, and air can be satisfactorily evacuated.

The number, position and shape of the slits 8 are not limited to those in the above embodiment, and three or more slits may be formed as necessary. The distance between the slits 8 can be arbitrarily changed as long as the deformation of the corresponding portion 7a of the insulating cover member 7 can follow the deformation of the tact metal plate 6.

In FIGS. 1A and 1B, reference numeral 10 denotes a push-on switch having the structure of the above embodiment, and 11
Denotes a variable resistor, and 12 denotes an electronic component such as a transistor. Steps for assembling the circuit device of FIG. 1 will be described.

First, a circuit board 1 having a predetermined contact pattern on the back surface is manufactured. At least two concave portions or holes 1a for positioning are formed on the circuit board. The necessary overcoat 5 is also formed on the substrate 1 in advance.
Then, the substrate 1 is placed on a jig (not shown) having two positioning projections with the variable resistor 11 facing downward while inserting the holes 1a of the substrate 1 into the projections. Next, a tact metal plate 6 is attached to a portion of the insulating cover member 7 where the slit 8 is formed on the back surface of which the adhesive 9 is applied. Then, the surface of the insulating cover member 7 coated with the adhesive 9 is
On the back of The insulating cover member 7 includes the substrate 1
Positioning hole or concave portion 7 provided corresponding to hole 1a of
When the insulating cover member 7 is lowered toward the substrate 1 by fitting the concave portion 7c to the projection of the jig, the tact metal plate 6 is positioned on a predetermined contact pattern of the substrate 1. Can be. After placing the insulating cover member 7 on the substrate 1, a predetermined pressure is applied between the two to apply the insulating cover member 7
Is bonded to the substrate 1, and the substrate 1 is separated from the jig to complete the assembly .

FIG . 4 shows an embodiment in which the present invention is applied to a switch having a tact metal plate with a flange.
In FIG. 4 , 15 is an overcoat, 16 is a tact metal plate with a flange, and 28 is a slit. When the tact metal plate 16 with a flange portion is used as in this embodiment,
The positioning of the tact metal plate is facilitated. However, in this embodiment, notches 16C are formed on the outer peripheral edge of the flange portion 16B so as to correspond to the slits 28, so that air can be easily removed. Window portion 1 straddling the portion 16B
6D ... are formed. The notch 16C and the window 16D make air bleeding smoother. In the present embodiment, the slits 28, 28 are bent outward (broad-angle V-shape) so as to face the center. Thereby, the area of the portion 7a of the insulating cover member 7 sandwiched between the two slits 28, 28 is increased. Further, in this embodiment, the overcoat 15 is
2 and 3, the thickness is about five times the normal thickness, similarly to the embodiment of FIGS. With this configuration, a relatively large click feeling can be obtained by using a tact metal plate with a flange portion that tends to have a small click feeling compared to a tact metal plate having only a dish-shaped portion.

FIG. 5 shows another embodiment in which the present invention is applied to a switch having a tact metal plate with a flange. In the present embodiment, the slits 38 forming the deformation promoting grooves are formed radially. In addition, corresponding to these slits 38, windows 16D.
Is formed. When one end of each of the radially formed slits 38 is extended to a position beyond the outer peripheral edge of the tact metal plate 16, the window 16 is formed in the tact metal plate 16.
D need not be formed.

When practicing the present invention, the slits 8, 2
In the case where neither the holes 8 and 38 nor the through holes 19 are provided, the substrate 1
The air may be vented by providing a through hole for venting air, or by providing a hole or notch for venting the insulating cover member 7.

If the insulating cover member and the tact metal plate are joined with an adhesive, the insulating cover member can be deformed by following the tact metal plate. However, if the switch operation is frequently performed over a long period of time, the adhesiveness and adhesiveness of the adhesive may decrease, and a situation may occur in which the insulating cover member cannot be deformed by following the tact metal plate. is expected. Therefore, as in the present embodiment, at least two slits are formed in a portion corresponding to the tact metal plate of the insulating cover member so as to be arranged at a predetermined interval, and both ends of the slit are formed on the peripheral edge of the tact metal plate. When extended to a position beyond the portion, the portion of the insulating cover member located between the two slits is in a state where both ends are fixed. As compared with the case where the entire periphery is fixed without forming the slit, the degree of freedom of the portion where both ends are fixed between the slits is higher. Therefore, even if and frequently switch operation for a long time is performed, as possible out possible to reliably follow a part of the insulating cover member in the deformation of the tact metal plate.
In addition, the slit also functions to release air, so that the operability of the switch is improved. In particular, when a slit is formed, air can be smoothly vented through the slit.

Further, according to this embodiment, by providing at least one deformation promoting groove on the outer surface of the insulating cover member, the insulating cover member can follow the tact metal plate.

Further, according to this embodiment, by providing a deformation promoting groove including a slit in the insulating cover member, even when a switch operation is frequently performed for a long period of time, a part of the insulating cover member can be tact metal plate. The tact metal plate can be held in a predetermined position by reliably following the deformation of the tact metal plate.

[0025]

According to the present invention, at least two that caused to follow the deformation of the insulation cover member in the deformation of the tact metal plate of the scan
Since the lits are formed so as to be arranged at a predetermined interval,
The part of the insulating cover member sandwiched by the slits
The degree of freedom increases. Therefore, the tact metal plate and the insulating cover member are joined via an adhesive, and a part of the periphery of the tact metal plate is brought into contact with the overcoat formed on the jumper wire to increase the click feeling. even if you, the insulating cover member can be reliably follow the tact metal plate, it is possible to reliably perform a switch operation. Also, the insulating cover member and the tact metal plate are
So that flux and flux
No dust or the like enters.

[Brief description of the drawings]

FIG. 1A is a side view of a circuit device provided with a push-on switch according to one embodiment of the present invention, and FIG.
It is a rear view of the apparatus of FIG.

FIG. 2A is a sectional view taken along line AA of FIG. 1B;
FIG. 2B is a sectional view taken along line BB of FIG.

FIG. 3 is a perspective view for explaining a configuration of a push-on switch according to one embodiment of the present invention.

FIG. 4 is a perspective view of the present invention including a tact metal plate with a flange portion.
Perspective for explaining the embodiment when applied to a switch
FIG.

FIG. 5 is a perspective view showing a tact metal plate with a flange according to the present invention;
Perspective for explaining the embodiment when applied to a switch
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board 2 Center contact 3 End contact 5,15 Overcoat 6,16 Tact metal plate 6a Peripheral edge of tact metal plate 7 Insulating cover member 8,28,38 Slit 9 Adhesive 10 Push-on switch 18 Groove 19 Through hole

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-2-126524 (JP, A) JP-A-1-100333 (JP, U) JP-A-1-119131 (JP, U) JP-A 55- 180228 (JP, U) Actually open 57-145232 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01H 13/00-13/76 H01H 11/00

Claims (1)

(57) [Claims] An insulating substrate on which a center contact, an end contact, and a jumper wire extending from the center contact are formed; an overcoat made of an insulating material formed on the jumper wire; A part is disposed on the substrate so as to abut on the end contact and the overcoat formed on the jumper line, and is capable of performing a reversing operation curved so as to protrude in a direction away from the substrate. A tact metal plate having a dish-shaped portion, and an insulating cover member fixed to the substrate so as to cover the tact metal plate so as to hold the tact metal plate at a predetermined position on the insulating substrate , push-on previous SL and the end contact through the center and the central portion contact and said central portion contacts abuts the outer wherein the dish is pressed from the dish-shaped portion of the insulation cover member is conductive Sui In Ji, the insulating cover member is the tact metal plate via an adhesive
And the insulating cover member is also bonded to the insulating substrate.
Are bonded through Chakuzai, wherein the said portion corresponding to the tact metal plate of the insulating cover member, at least two slits that to follow the deformation of the insulating cover member on deformation of the tact metal plate of a predetermined Between
A push-on switch characterized by being formed so as to be spaced apart .