JP3196375B2 - Push 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 switch used for various electronic devices.

2. Description of the Related Art A conventional switch of this kind is disclosed in
18 to FIG. 18 by the switch described in JP-A-85830.
This will be described with reference to FIG. Reference numeral 31 denotes a case in which a fixed terminal A32 and a fixed terminal B33 are implanted in a planar shape on the inner bottom surface and a coil portion 34e of a contact piece 34 described later on the bottom surface.
Has a U-shaped recess 31a for supporting the same.

Reference numeral 34 denotes a conductive member having a spring property.
A movable end 34b having a contact portion 34c bent further in a substantially semicircular shape, and a fixed end 34a provided with a contact portion 34d which is substantially linear and has a tip contacting the fixed contact A32. A contact piece of a torsion coil spring having
35 is a substantially rod-shaped groove formed of a molded member, and has a U-shaped groove 35 at one end.
a of the movable end 34 of the contact piece 34
This is an operating body that slides in the longitudinal direction across the contact point b and moves the contact portion 34c and the fixed contact B33 apart. A projection 36b has a hole 36a for slidably holding the operating body 35, and is coupled to the case 31 to hold the coil portion 34e of the contact piece 34 together with the U-shaped recess 31a of the case 31. It is a cover having.

Next, the operation of the above conventional switch will be described. FIG. 20 shows a normal state, in which the operating body 3
When you start 5 of depressing operation, the movable end 34b is the rotation to the contact portion 34c and the fixed terminal B33 abuts turned on in FIG. 21. Further depressing the contact portion 34c and the fixed terminal B33 is slid in the X direction while abutting, 2
2 is completed. When the pressing force of the operating body 35 is removed, the contact piece 34 returns to the normal state in FIG. 20 due to the returning force, and a series of operations is completed.

[0005]

However, in the above-mentioned conventional construction, since the contact piece 34 is a coil spring, entanglement is apt to occur and automatic supply is difficult.
It has the disadvantage that the shape of the contact piece is complicated and the machining cost is high, and in addition, the accuracy of the ON position of the switch is reduced by the U
The on-stroke was unstable because it depended on the bending angle of the character. At the time of assembly, the movable end 3 of the contact piece 34
4b is nearly upright with respect to the bottom surface of the operation body, so that the contact piece 34 is easily deformed during assembly. Furthermore, since the contact portion 34c of the movable end 34b of the contact piece 34 and the fixed terminal B33 abut during the operation, the operating force during operation is greatly changed, and a sense of being caught easily occurs, and the contact pressure at the time of the abutment is low. However, there is a disadvantage that the contact during the on-stroke becomes unstable.

Further, since the U-shaped recess 31a for receiving the coil portion 34e of the contact piece 34 and the fixed terminals A32 and B33 are arranged in parallel on the bottom surface of the case 31, the width of the switch is limited to a certain extent. When the switch is used for surface mounting in a state where the switch is turned down, the width of the switch becomes the mounting height, and there is a limit to the reduction in thickness.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a push switch which is thin and excellent in operation feeling and on-stroke accuracy.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a fulcrum is formed at at least one end, and the other end is formed on the bottom surface inside the case as the bent portion is pushed down. A contact piece made of a plate-like conductive member having a substantially U-shape or a V-shape in which the vicinity of a bent portion becomes a point of force so as to slide is used.

[0009]

Therefore, according to the present invention, with the above configuration, the contact piece performs a rotating operation about the fulcrum.
In this case, the imaginary turning radius of the movable contact portion is half the turning radius of the bent portion.
Since it is small relative to the diameter, a large operation stroke can be secured despite the relatively small change in deflection of the contact piece.
By forming the contact piece with a plate-shaped conductive member, it can be an inexpensive contact piece that can be easily processed, and can be supplied in a hoop shape at the time of assembly, which facilitates automation of assembly.
Ri, for further contact portion of the contact piece and the case (action point and the movable contact portion) is always slides casing portion bottom Menjo, be made stable operating force during operation good feeling obtained Further, since the on-stroke accuracy does not depend on the processing accuracy of the bending angle of the contact piece, high accuracy can be ensured.

[0010]

FIG. 1 shows an embodiment of a push switch according to the present invention.
This will be described with reference to FIG.

First, a first embodiment will be described with reference to FIGS. Reference numeral 1 denotes a substantially square shape, and a fixed contact A
The case 4 in which the fixed terminal A2 having the fixed contact 2a and the fixed terminal B3 having the fixed contact B3a are planted in a plane ,
Housed, also substantially U-shaped made conductive member having elasticity
Is a tongue piece 4 having a movable portion 4f bent in a substantially V shape , a fulcrum portion 4a having one side bent outward and a movable contact A4b and a movable contact B4c at the other end, respectively.
The contact piece 5 formed with d and 4e is formed of a molded member and is substantially rod-shaped, and has a groove 5a at one end which presses the movable portion 4f of the contact piece 4.
Is an operating body that slides in the longitudinal direction to move the movable contact A4b, the movable contact B4c, and the fixed terminal A2, the fixed terminal B3 apart. Reference numeral 6 denotes a cover coupled to the case 1, which holds the operation body 5 so as to be slidable, and an upper part of the operation body 5.
And a fulcrum 4 of the contact piece 4
a is rotatably engaged to hold the contact piece 4 in a slightly bent state with the inner bottom surface of the case 1. ing.

Next, the operation of the above embodiment will be described with reference to FIGS. FIG. 4 shows a normal state, in which the movable contact A4b is always in contact with the fixed contact A2a. Next, when the operation of pressing down the operation body 5 is started, the movable section 4 is moved.
f is rotated around the fulcrum portion 4a, the movable contact A4b always fixed contact A2a and elastic contact while the upper fixed contact A2a
The sliding movable contact B4c slides a predetermined distance and the fixed contact B
3a and comes into the ON state in FIG. When further depressed, the movable contact A4b, the fixed contact A2a, and the movable contact B
4c and the fixed contact B3a are slid in the horizontal direction while being in elastic contact with each other, and the state shown in FIG. 6 is obtained. Here, a repulsive force F corresponding to the deflection A of the contact piece 4 is generated between the fulcrum 4a and the movable contacts 4b and 4c, and when a distance E> 0 between the two (see the fulcrum in FIG. 6). A rotational moment of E × F is generated in the clockwise direction (the left side is positive with respect to the portion 4a).
Therefore, when the pressing force of the operating body 5 is removed, the contact piece 4 returns to the normal state in FIG. 4 due to the returning force, and a series of operations is completed.

As described above, according to the above embodiment, the contact piece
4 is movable when rotating around the fulcrum 4a.
The virtual turning radius of the contact point is
Since the contact piece 4 is small, a large operation stroke can be secured even though the deflection of the contact piece 4 is relatively small, and the contact piece 4 can be formed of a thin metal plate without plastic deformation. Therefore, the inexpensive contact piece 4 can be easily processed, and since it can be supplied in a hoop shape at the time of assembling, there is an effect that automatic assembling can be performed quickly and easily. In addition, since the movable contacts 4b and 4c always slide on the inner bottom surface of the case 1, a stable operation force can be obtained during the operation process and a good feeling can be obtained. Since the bending angle does not depend on the processing accuracy, high accuracy can be ensured.

Next, a push switch according to a second embodiment which is another embodiment of the push switch according to the present invention will be described with reference to FIG. FIG. 7 shows the inner bottom surface of a case , which is a main part, and the other parts are the same as those in the embodiment of FIG. 1. Therefore, description thereof will be omitted. If described, 1a is a case and 7 has a fixed contact A7a. fixed terminal a, 8 is fixed terminal B having a normally closed contact 8a, 9 is fixed terminal C having a normally open contact 9a, movable in the normal state
The contact A4b is a fixed contact A7a, and the movable contact B4c is a no contact.
Mar closed and respectively bullets against the contact 8a, the movable contact A4b slides on the fixed contacts 7a in accordance with the depressing operation operation body 5, the movable contact B4c the node on Mar Close
After sliding on the contact 8a, after the predetermined distance
To the normally open contact 9a away from the close contact 8a.
Push switch of one-circuit two contact by contact is possible. This normally closed contact has the advantage that when the switch is left in the normal state for a long time, corrosion of the contact due to gas in the environment can be prevented and high contact reliability can be obtained.

FIG. 8 shows a third embodiment of the push switch according to the present invention, and a contact piece as a main part will be described with reference to FIG. The other configuration is the same as that of the embodiment of FIG. 1 and the description is omitted. The contact piece 20 is a flat plate, and a fulcrum 20a bent upward is provided at the end of the outer frame. Movable part 20g provided on the other end side
The tongue pieces 20d and 20e having the movable contacts 20b and 20c are bent and raised to the opposite side to the end of the fulcrum 20a with the vicinity as a root. By using the contact piece 20 having this structure, the height of the switch using the contact piece 4 in the embodiment of FIG. 1 can be reduced, and the processing of the contact piece 20 becomes easy.

FIG. 9 shows a fourth embodiment of the push switch according to the present invention, and a contact piece as a main part will be described with reference to FIG. Since the other configuration is the same as that of the embodiment of FIG.
Similar to the embodiment of FIG. 1, a metal sheet having elasticity is substantially U-shaped.
Alternatively, it is bent into a substantially V shape, and a fulcrum 21a is provided at one end.
And the opposite side via the movable portion 21f which is an intermediate bent portion
Tongue 21 having a movable contact 21b, and 21c to the end portion in the
d, 21e, and the tongue pieces 21d, 2
Tongue piece 21k shorter than 1e makes elastic contact with the inner bottom surface of the case
It is provided as follows. Due to the reaction force of the tongue piece 21k, a sufficient return force can be obtained even if the distance E shown in FIG. 6 is extremely small or becomes negative.

FIG. 10 shows a fifth embodiment of the present invention. Referring to FIG. 10, the contact piece 4 and the cover 6 which are main parts will be described. The other configuration is the same as that of the embodiment of FIG. 1 and will not be described again. The fulcrum 4g of the contact piece 4 has an arc shape and the protrusion 6 at the tip of the support 6b of the cover 6.
A hole (not shown) into which d is inserted is provided.

With the above structure, when the contact piece 4 rotates about the fulcrum 4g as the operating body 5 is pressed down, the fulcrum 4
Since g is an arc, the contact portion between the fulcrum portion 4 g and the support portion 6 b interlocks with the rotation angle of the contact piece 4 so that the movable contact 4 b slides on the inner bottom surface of the case 1. Since the distance E shown in FIG. 6 can be increased by moving to a position away from the vehicle, there is an effect that a sufficient restoring force can be obtained despite a large stroke.

Referring to FIGS. 11 and 12, other embodiments having the effect of obtaining a sufficient restoring force as described above will be described as sixth and seventh embodiments. The description of the same parts as those of the fifth embodiment will be omitted. According to FIG. 11, the fulcrum 4h of the contact piece 4 is flat and provided with a hole (not shown) into which the projection 6d of the cover 6 is inserted, and a large arc-shaped portion is formed on the lower surface of the support 6b of the cover 6. 6e is provided.

Further, in the seventh embodiment shown in FIG. 12, a convex portion 6f is provided on the lower surface of the support portion 6b of the cover 6.

Note that, instead of the convex portion 6f, a convex portion may be provided at a portion corresponding to the convex portion 6f of the fulcrum 4h of the contact piece 4.

[0022] That is, FIG. 10 to FIG. 12 fulcrum 4 g in the embodiment of, a gap ahead direction of the contact portion of the supporting portion 6b of the 4h and the cover 6, with the sliding of the movable contact 4b fulcrum
By moving the contact portion between the portions 4g and 4h and the support portion 6b forward, a sufficient restoring force can be obtained even with a large stroke.

Next, a surface mount type push switch according to an eighth embodiment of the present invention will be described with reference to FIGS.

[0024] According to the figure, the fixed contact 51a to the inside bottom surface substantially squares shape 41, 52a the insert molding, on this surface
Another fixed contact 50a is insert-molded on the bottom surface of the concave portion 41a of the support portion 41b protruding from the inner side wall so as to face each other, and a window 41c is formed on the opposing surface of the fixed contacts 51a and 52a. a case provided, 44 is a contact piece made of sheet metal, each fulcrum portion 44a and the movable contact 44b to an end portion of the movable portion 44f and the sides are formed by a substantially U-shaped, the upper case 45 When projecting into the window 41c of 41
An operation body 46 whose lower end abuts on the movable portion 44f of the contact piece 44 is a cover that covers these from the side and is coupled to the case 41. The contact piece 44 is sandwiched between the fixed contact 50a and the fixed contacts 51a and 52a, and the fulcrum 44a
And the fixed contact 50a are incorporated in the case 41 so as to be always in contact therewith.

[0025] Next will be described by FIG. 14, the operation, rotates about the contact piece 44 with the depression operation operation body 4 5 fulcrum portion 44a, the fixed contact 50a and the fixed contact 51a, the switching between 52a Is what you do.

As described above, the fulcrum portion 44a is fixed to the fixed contact 5
0a, the movable contact 44b is fixed contact 5
1a and 52a only need to be brought into sliding contact with each other.
Can be constituted by one movable contact 44b, and the switch can be made thinner.

FIGS. 15 to 17 show a ninth embodiment of the push switch according to the present invention. The same parts as those of the eighth embodiment in FIG. Then, the terminals 53 and 54 are terminals molded by insert molding on a surface parallel to the sliding direction of the operating body 45 of the case 41.
44r and 44s are movable contacts provided on tongue pieces 44n and 44p, respectively, which are bent and raised vertically from both sides of the contact piece 44.
Since s is in sliding contact on the terminal 54 and the contact portion is provided on the side surface side, it is possible to further reduce the thickness, and the terminals 53 and 54 are insert-molded on the side surface of the case 41. The structure of the molding die is simple, and the terminals 53,
This also makes it easy to assemble 54.

[0028]

According to the present invention, as is apparent from the above embodiment, when the contact piece rotates around the fulcrum ,
The imaginary turning radius of the movable contact portion corresponds to the turning radius of the bent portion.
Since then smaller, the deflection change of the contact piece can be relatively small even though ensuring a large operating stroke, since further to one end slides always casing bottom Menjo contact piece,
A stable operation force without a feeling of being caught during operation can be obtained.

In addition, since the on-stroke accuracy of the operation unit does not depend on the bending accuracy of the contact piece, it is possible to provide a push switch having excellent on-stroke accuracy.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a push switch according to a first embodiment of the present invention.

FIG. 2 is a plan view of a bottom surface of the case, which is a main part of the same.

FIG. 3 is an overall perspective view of a contact piece which is the main part.

FIG. 4 is a side sectional view of the push switch in a normal state.

FIG. 5 is a side cross-sectional view of the operating body during pressing.

FIG. 6 is a side sectional view showing a full stroke state of the operating body.

FIG. 7 is a plan view of a case which is a main part of the second embodiment.

FIG. 8 is a perspective view of a contact piece which is a main part of the third embodiment.

FIG. 9 is a perspective view of a contact piece which is a main part of the fourth embodiment.

FIG. 10 is a side sectional view of the fifth embodiment.

FIG. 11 is a side sectional view of the sixth embodiment.

FIG. 12 is a side sectional view of the seventh embodiment.

FIG. 13 is an exploded perspective view of the eighth embodiment.

FIG. 14 is a sectional side view of the same.

FIG. 15 is a side sectional view of the ninth embodiment;

FIG. 16 is a side sectional view of the operating body pressed state.

FIG. 17 is a perspective view of a contact piece which is the main part.

FIG. 18 is an exploded perspective view of a conventional push switch.

FIG. 19 is a sectional side view of the same.

FIG. 20 is a side sectional view of the normal state.

FIG. 21 is a side sectional view in the middle of pressing the operating body.

FIG. Side cut when the operating body is pressed (full stroke)
Front view

[Explanation of symbols]

 Reference Signs List 1 case 2 fixed terminal A 3 fixed terminal B 4 contact piece 4a fulcrum 4b movable contact A 4c movable contact B 4d tongue piece 4e tongue piece 4f movable part 5 operating body 6 cover 6b support part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 64-23822 (JP, U) Japanese Utility Model Showa 64-23823 (JP, U) Japanese Utility Model Showa 62-86034 (JP, U) Japanese Utility Model Showa 61- 100837 (JP, U) JP-A-61-100836 (JP, U) JP 4-41538 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 13/52 H01H 1 / 60 H01H 3/12

Claims (5)

(57) [Claims] 1. A terminal having a fixed contact on an inner bottom surface.
A case and a substantially U having a bent portion directed substantially upward in the case.
A contact piece made of a V-shaped or substantially V-shaped plate-shaped conductive member,
An operating body that presses the vicinity of the bent portion of the contact piece from above,
The operation body is inserted to regulate the movement of the contact piece by elastic force.
The contact piece has an end at one end.
Having a movable contact portion that contacts the inner bottom surface of the case,
At the other end, a fulcrum that elastically contacts the support provided on the cover
When the operation body presses the vicinity of the bent portion,
When the movable contact portion of the contact piece approaches the fulcrum portion of the contact piece
Slide the inner bottom surface of the case in the direction
When released, the contact piece moves due to the elastic force of the contact piece
The contact part slides in the opposite direction and the fixed contact on the inner bottom
A push switch that opens and closes points electrically . 2. A terminal having a fixed contact on an inner wall.
A case and a substantially U having a bent portion directed substantially upward in the case.
A contact piece made of a V-shaped or substantially V-shaped plate-shaped conductive member,
An operating tool that presses the vicinity of the bent portion of the contact piece from above
The contact piece may be in contact with the inner wall of the case.
A moving contact portion, and one end of which has an inner bottom surface of the case.
It has a sliding part that contacts the fixed contact and
A fulcrum part which makes elastic contact with the inner wall of the case and makes electrical contact
When the operation body presses the vicinity of the bent portion,
The movable contact portion of the contact piece approaches the fulcrum of the contact piece
Slide the inner bottom surface of the case in the direction
Is released, the elasticity of the contact piece causes the contact piece to
The moving contact slides in the opposite direction to fix the inner bottom surface of the case
A push switch that opens and closes contacts electrically . 3. The contact piece has a movable part at one end and a movable part at the other end.
Consists of multiple tongues, the tips of which are in opposite directions
It has at least a movable contact and a fulcrum
The push switch according to claim 1, wherein 4. The contact piece has a plurality of tongues having movable contact portions.
With one piece, at least one of the tongue pieces
2. The push switch according to claim 1, wherein the push switch is short . 5. A fulcrum portion of a contact piece and a support portion inside a case.
Contact between gap provided at other party positions, together with the movement of the movable contact
Move the contact position between the fulcrum and the support
The push switch according to claim 1 .