JP2000149715A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch having a structure that allows direct and easy assemble into a board and can easily deal with the board to which the switch is assembled even if the board is a flexible type. SOLUTION: This switch is provided with a contact spring 70 wherein a contact part 75 is formed protrusively from a coil spring part 71, a flexible board 50 electrically connected by abutting one end surface 77 of the coil spring part 71 on it, a contact member 40 installed at a predetermined distance from the contact part 75 of the contact spring 70, and a pressing member 30 to abut the contact part 75 on the contact member 40 by pressurizing the coil spring part 71 in a manner to twist it in a winding direction. The contact member 40 is formed of a plate material. The pressurizing member 30 is rotatably mounted centering a fulcrum. A pressurizing part 35 to pressurize an arm part 79 of the contact spring 70 is formed in the pressurizing member 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized switch having a structure using a coil spring which is used as a switch for detecting various kinds of electric equipment.

[0002]

2. Description of the Related Art Conventionally, a small switch using a coil spring as a contact spring has been used as a switch for detection attached to each part of various electric devices, for example, a switch for detecting insertion of a cassette tape, a compact disk, various cards, or the like. Switches are being used.

[0003] This type of switch, for example, has two switches in a case.
One contact plate is housed, one winding end portion of the contact spring is connected to one contact plate, and the other winding end portion of the contact spring is arranged on the other contact plate at a predetermined distance from the other contact plate. By pressing the other end of the winding with a push rod, the end of the winding is bent against the elastic force of the contact spring and abuts on the other contact plate to turn on both contact plates. I have.

[0004]

However, any conventional switch using a coil spring is independently formed as a single unit. To mount this switch on a substrate, a contact plate protruding from the case must be replaced with a substrate. It had to be fixed with solder or the like. This not only complicates the mounting work on the board, but also increases the thickness of the entire switch including the board, which hinders miniaturization.

When a flexible substrate is used as a substrate, it is sometimes impossible to solder a contact plate to a conductive pattern printed on the flexible substrate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to enable a switch to be directly and easily mounted on a substrate, and to easily cope with the problem even if the substrate to be mounted is a flexible substrate. An object of the present invention is to provide a simple switch having a structure that can be performed.

[0007]

In order to solve the above-mentioned problems, a switch according to the present invention is configured such that an electric contact is provided by contacting a contact spring having a contact portion protruding from a coil spring portion and one end surface of the coil spring portion. The substrate to be electrically connected, the contact member installed at a predetermined distance from the contact portion of the contact spring, and the coil spring portion is pressed to be twisted in the winding direction, so that the contact portion is attached to the contact member. And a pressing member to be brought into contact therewith. Further, the contact member is made of a plate material attached to the substrate. Further, the pressing member is rotatably mounted around a fulcrum, and is provided with a pressing portion for pressing the contact portion of the contact spring so as to contact the contact member.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are views showing a switch 1 according to an embodiment of the present invention. FIG. 1A is a front view of the switch 1 with a flexible substrate 50 and a holding plate 60 removed, and FIG. ) Is switch 1 FIG.
FIG. 2A is a cross-sectional view taken along line AA shown in FIG.

As shown in both figures, the switch 1 is
0, the contact spring 70, the pressing member 30, and the contact member 40 are housed, and the flexible substrate 50 and the pressing plate 60 are mounted thereon. Hereinafter, each component will be described.

The case 10 is formed by integrally molding a molding resin into a substantially rectangular shape.
Side walls 11 and 13 are provided on both sides of the spring receiving surface 15, a circular spring receiving surface 15 is provided inside the side wall 13, a supporting projection 17 and a small projection 17 a at the tip thereof are provided at the center of the spring receiving surface 15, A guide wall 19 that protrudes in an arc shape is provided below, a guide protrusion 21 is provided to protrude inside the side wall 11, and a contact member mounting surface 23 is provided below the bottom surface 20. , Two fixing projections 25,
25 are provided. Further, a support hole 27 penetrating above the spring receiving surface 15 of the bottom surface 20 is provided, and a top surface of the side wall 13 is a stopper surface 29. A rectangular through hole 28 is provided in a portion of the bottom surface 20 between the guide wall 19 and the contact member mounting surface 23.

Next, the contact spring 70 includes a coil spring 71,
It comprises a locking portion 73 provided at one end and a contact portion 75 provided at the other end.

Here, the coil spring portion 71 is formed by winding a wire in a cylindrical spiral shape. However, a slight gap is provided between the wires constituting the spiral, and the properties of the compression coil spring and the characteristics of the torsion coil spring are provided. It is configured to have properties.

The locking portion 73 is formed by once pulling out one winding end portion of the coil spring portion 71 outward in the radial direction and then bending it toward the other winding end portion. Note that the end surface of the coil spring portion 71 on the side where the locking portion 73 is provided is a contact surface 77 that contacts the contact pattern 57 described below. Further, the contact portion 75 is a coil spring 7
An arm portion 79 formed by pulling out the other winding end portion of the first portion substantially outward in the radial direction as it is and bending it into a substantially U-shape.
Is formed by bending the front end downward in a semicircular arc.

Next, the pressing member 30 is an integrally molded product of a molding resin, and the supporting protrusions 33, 3 are formed from both side surfaces of the main body 31.
3 is provided so as to protrude, a pressing portion 35 is provided at one end thereof, and a stopper portion 37 is provided below the other end. A guide small protrusion 39 is provided at the lower part of one side surface of the pressing portion 35.

Next, the contact member 40 is a tongue-shaped contact portion contact portion 4 which is bent at right angles to the upper side of a conductive metal plate.
1 and two locking holes 43, 43 are provided in the lower portion.

The supporting hole 27 and the small projection 17a of the case 10 of the flexible substrate 50 and the two fixing projections 2
The through holes 51, 5
3, 55, 55 are provided, a U-shaped contact pattern 57 is provided around the through holes 51, 53, and a contact pattern 59 is provided around the through holes 55, 55, respectively.

Each of the contact patterns 57 and 59 is led out to another portion (not shown) of the flexible substrate 50 by a circuit pattern (not shown).

The holding plate 60 is made of a metal plate and has through holes 61, 63, 65, 65 at positions facing the through holes 51, 53, 55, 55 of the flexible substrate 50, respectively.
Is provided. The holding plate 60 is for holding the flexible substrate 50, and may be made of another member such as a synthetic resin as long as it is not a metal plate but is hard.

Next, in order to assemble the switch 1, first, as shown in FIG.
The contact members 40 are brought into contact with the contact member mounting surface 23 by inserting the contact members 5, 25 into the locking holes 43, 43 of the contact member 40.
At this time, the tip side of the contact portion contact portion 41 is inserted into the through hole 28 (see FIG. 1B).

Next, the support projection 17 of the case 10 is inserted into the coil spring 71 of the contact spring 70 so that the coil spring 71
Of the contact spring 70 is brought into contact with the inner surface of the side wall 13.

Next, one support projection 33 of the pressing member 30 is inserted into the supporting hole 27 of the case 10, and at this time, the arm portion 79 is slightly pressed down by the pressing portion 35 of the pressing member 30 as shown in FIG. In this state, the stopper 37 is placed on the stopper surface 29. As a result, the pressing portion 35 does not rattle due to the repulsive force of the coil spring portion 71 and the case 10
Attached to. At this time, a part of the arm portion 79 is located on the inner side surface of the guide projection 21 as shown in FIG.

Then, the flexible substrate 50 is
At this time, the other supporting projection 33 of the pressing member 30, the small projection 17 a of the case 10, and the fixing projection 25 are fixed to the through holes 51, 53, 55, 55 of the flexible substrate 50. And each through hole 6 of the holding plate 60
The small projections 17a and the tips of the fixing projections 25, 25 are inserted into the small projections 1, 63, 65, 65, and crushed by heat caulking. Thus, the switch 1 is completed.

The switch 1 configured as described above
Is that the contact surface 77 of the contact spring 70 is
The contact portion 75 is located at a predetermined distance from the contact portion abutment portion 41 of the contact member 40. Further, the contact member 40 is a contact pattern 5 of the flexible substrate 50.
9 abuts.

Since a part of the arm portion 79 is inside the guide protrusion 21 as described above, and the arm portion 79 is in contact with a portion on the near side of the small protrusion 39 of the pressing portion 35,
The position of the arm portion 79 is determined in the thickness direction of the case 10 (FIG. 1).
(A).
Is located at a substantially central position in the thickness direction.

Then, the pressing portion 35 of the pressing member 30 is moved by an arrow B
When pressed from the direction, the support portion 33 rotates about the support protrusions 33, 33, the pressing portion 35 presses the arm portion 79, winds the coil spring portion 71 and lowers while twisting in the direction, and the contact portion 75 contacts the contact portion 75. By contacting the contact portion 41 of the member 40, both contact patterns 57, 5 of the flexible substrate 50 are formed.
Nine turns on. When the pressing on the pressing portion 35 is released, the arm portion 79 automatically returns to the original position by the elastic return force of the coil spring portion 71, and the space between the two contact patterns 57 and 59 is turned off.

The pressing portion 35 can be operated even when pressed in the direction of arrow C. In the present embodiment, since the pressing member 30 is rotatably mounted around the fulcrum, the switch can be turned on and off not only from above (in the direction of arrow C) but also from the side (in the direction of arrow B). Has become.

In the above embodiment, the flexible substrate 50 is used as the substrate. However, the holding plate 60 may be omitted by using a rigid substrate instead.

[0028]

As described in detail above, the present invention has the following excellent effects. The switch can be directly and easily assembled to the substrate. Therefore, not only does the work of attaching the assembled switch to the substrate again become unnecessary, but also the thickness of the entire switch attached to the substrate can be reduced, and the size can be reduced.

Even if the substrate to be assembled is a flexible substrate, it can easily cope with this. Further, since soldering is not required, there is no heat treatment, and the degree of freedom of the material of the substrate to be mounted is increased.

[Brief description of the drawings]

FIG. 1 is a view showing a switch 1 according to an embodiment of the present invention, and FIG. 1 (a) is a front view when a flexible substrate 50 and a holding plate 60 are removed from the switch 1, FIG.
FIG. 2B is a cross-sectional view of the switch 1 taken along line AA shown in FIG.

FIG. 2 is an exploded perspective view of the switch 1. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switch 10 Case 30 Pressing member 35 Pressing part 40 Contact member 50 Flexible board (substrate) 60 Pressing plate 70 Contact spring 71 Coil spring part 73 Locking part 75 Contact part

Claims (3)

[Claims] A contact spring formed by projecting a contact portion from a coil spring portion; a substrate electrically connected by contacting one end surface of the coil spring portion; and a predetermined distance from a contact portion of the contact spring. A switch member comprising: a contact member that is installed in a vertical direction; and a pressing member that presses the coil spring portion so that the coil spring portion is twisted in a winding direction to bring the contact portion into contact with the contact member. 2. The switch according to claim 1, wherein said contact member is made of a plate material attached to said substrate. 3. The pressing member is rotatably mounted around a fulcrum, and is provided with a pressing portion for pressing a contact portion of the contact spring so as to contact the contact member. The switch according to claim 1 or 2, wherein