JPH0573825U - Leaf switch - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a leaf switch having a good space factor, by which the conduction failure due to adhesion of dust can be surely avoided by devising the contact part and eliminating the need for a cover member. [Structure] On a base 8 made of an insulating material, an elastic operating piece 9 that is elastically deformed by being driven by an operating member, and the elastic operating piece 9
A pair of leaf springs 10 and 11 of good conductivity, which extend at a predetermined interval in a plane substantially parallel to
The pressing operation type chip-type switch module 14 electrically and mechanically connects the leaf springs 10 and 11 together,
The operation portion 14a of the switch module 14 is made to face the elastic operation piece 9.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a leaf switch that is switched by electrically connecting or disconnecting a pair of leaf springs erected on a base.

[0002]

[Prior Art]

 As shown in FIG. 2, a conventional leaf switch includes a base 1 made of synthetic resin, a pair of leaf springs 2 and 3 of good conductivity which are provided upright on the base 1 and face each other, and each leaf spring. It is provided with a pair of terminals 4 and 5 which are electrically connected to the springs 2 and 3 and project below the base 1, which are integrated by insert molding. In the case of this conventional example, the driving body 6 is fixed to the free end of one leaf spring 2 and the convex contact 3a is provided at the free end of the other leaf spring 3, so that it is not shown. When the operating member pushes the driving body 6 toward the convex contact point 3a, when the leaf spring 2 bends and comes into contact with the convex contact point 3a, a switch-on state is established in which the terminals 4 and 5 are electrically connected, The bending of the leaf spring 3 pushed through the leaf spring 2 ensures good operability during overstroke and stability of conduction. Further, when the pushing operation force of the operating member with respect to the driving body 6 is removed, the bent leaf springs 2 and 3 return to their original upright shapes by their elasticity, so that the leaf spring 2 has a convex shape. The contact 3a is separated from the contact 3a, so that the connection between the terminals 4 and 5 is released and the switch returns to the off state.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional leaf switch, since the contact portion (the convex contact 3a, etc.) for contacting and separating the leaf springs 2 and 3 is exposed to the outside, it is easy to cause a conduction failure due to adhesion of dust or the like. , High reliability was difficult to obtain.

Therefore, conventionally, as shown by a chain line in FIG. 2, a leaf switch in which the periphery of the leaf springs 2 and 3 is surrounded by a cover member 7 made of synthetic resin or the like has been widely adopted. Since the outer shape becomes large due to the addition of No. 7, there is a problem that the space factor deteriorates. Further, since the cover member 7 needs an opening 7a for inserting and removing the operation member, the opening 7a is used. There was a risk that dust would enter.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a leaf switch which is capable of reliably avoiding conduction failure due to adhesion of dust and the like and has a good space factor. is there.

[0006]

[Means for Solving the Problems]

 The above-described object of the present invention is to provide an elastic actuating piece that is elastically deformed by an operating member on a base made of an insulating material and a predetermined interval in a plane substantially parallel to the elastic actuating piece. A pair of leaf springs of good conductivity that extend are erected, and the pair of leaf springs are electrically and mechanically connected to each other by a push-operation type chip-type switch module. This is achieved by making the operating portion face the elastic operating piece.

[0007]

[Action]

 According to the above means, the pair of leaf springs are electrically connected by pushing the operating portion of the switch module which is made into a chip by bending the elastic actuating piece, and when the overstroke occurs, both leaf springs are connected via the switch module. Since it can be flexed, the operating characteristics required for the leaf switch can be ensured while allowing the switch module to function as a contact portion. Moreover, since the inside of the switch module is almost sealed, dust adhesion, etc. Therefore, there is no possibility of causing a conduction failure due to, and thus it is not necessary to additionally attach a cover member.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIG.

The leaf switch shown in FIG. 1 has an elastic operating piece 9 made of a metal plate or the like, which is elastically deformed by an operating member (not shown), on a base 8 made of synthetic resin, and the elastic operating piece 9 On the other hand, a pair of good conductive plate springs 10 and 11 extending in a plane substantially parallel to each other with a predetermined gap G are provided upright and electrically connected to the leaf springs 10 and 11. Terminals 12 and 13 are provided below the base 8 and are integrated by insert molding. The free ends of the pair of leaf springs 10 and 11 are electrically and mechanically connected by a pressing operation type chip-type switch module 14, and the operating section 14a of the switch module 14 is elastically actuated. It is facing the piece 9. A drive body 15 directly driven by the operating member is fixed to the free end of the elastic operation piece 9. In addition, the switch module 14 used here is substantially sealed inside by a casing 14b and a vertically movable operation section 14a, and it is known that the contact section can be switched from OFF to ON by pushing in the operation section 14a. Although it is a structure, it is extremely small with an external dimension of about 2 mm x 2 mm.

In the leaf switch having the above structure, when the operating member (not shown) pushes the driver 15 to bend the elastic operating piece 9 toward the microminiature switch module 14 side, the operating portion 14 a of the switch module 14 is pushed. Is pushed into the elastic actuating piece 9 to switch the contact from OFF to ON, so that it is switched to a switch-ON state in which the terminals 12 and 13 are electrically connected via the leaf springs 10 and 11, and further, the switch module. Due to the bending of the leaf springs 10 and 11 pushed into the elastic actuating piece 9 via 14, the good operability during the overstroke and the stability of conduction are secured. Further, when the pushing operation force of the operating member with respect to the driving body 15 is removed, the elastic actuating piece 9 and the leaf springs 10 and 11 that have been bent return to their original upright shape by their elasticity, so that the elastic actuating operation is performed. The piece 9 is separated from the operation portion 14a of the microminiature switch module 14 and the switch module 14 automatically returns from on to off, whereby the conduction between the terminals 12 and 13 is released and the switch 9 returns to the switch off state. In other words, this leaf switch makes the microminiature switch module 14 function as a contact point, unlike the conventional product in which leaf springs are brought into contact with and separated from each other to perform switching. However, the leaf switch has no operating characteristics. It is intact and can be used in the same way as conventional products.

Further, in this leaf switch, since the inside of the ultra-small switch module 14 which is the contact portion thereof is almost sealed, there is no fear of causing conduction failure due to adhesion of dust, etc. Unlike the product, it is not necessary to attach a cover member separately, and it is possible to avoid upsizing, and the space factor is good. Moreover, in the case of the cover member, dust may enter through the opening for inserting and removing the operating member, but in the case of the switch module 14, there is no such concern, so reliability is further enhanced. There is.

Since the elastic operating piece 9 is for pressing and driving the operating portion 14a of the switch module 14, it may be formed of an elastic material other than a metal plate.

[0013]

[Effect of the device]

 As described above, according to the present invention in which the pair of leaf springs are electrically and mechanically connected by the push-operation type chip-type switch module, the switch module is made to function as a contact portion. Since it is possible to secure the operating characteristics required for the leaf switch, it is possible to reliably avoid the conduction failure due to the adhesion of dust, which was a concern in the past, at the contact part, and it is not necessary to attach a cover member separately. It has an excellent effect that the space factor is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a leaf switch according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a conventional example.

[Explanation of symbols]

 8 base 9 elastic actuating piece 10, 11 leaf spring 12, 13 terminal 14 switch module 14a operation part

Claims (1)

[Scope of utility model registration request] 1. An elastic operating piece which is elastically deformed by being driven by an operating member, and a good conductive material which extends at a predetermined interval in a plane substantially parallel to the elastic operating piece on a base made of an insulating material. A pair of flexible leaf springs are erected, and the pair of leaf springs are electrically and mechanically connected by a push-operation type chip-type switch module, and the operating portion of the switch module is elastically coupled. A leaf switch characterized by facing the operating piece.