TWI484515B - Push button switch - Google Patents

Description

Push button switch

The present invention relates to a push button switch that can be used as a switch for operating various small electronic machines.

As an example of the conventional push button switch, the push switch disclosed in the following Patent Document 1 is well known. The switch is configured to have: a fixed contact fixed to the substrate; a movable contact disposed on the fixed contact; a conical elastic body placed on the movable contact; and an operating body fixed to the elastic body. Further, the movable contact is formed by a thin metal plate, and a tongue portion is provided at the center of the circular annular outer peripheral portion, and has a shape in which the tongue portion is cut upward. Further, when the operation body is pressed, the conical portion of the elastic body is elastically deformed, and the lower portion of the elastic body presses the tongue portion of the movable contact downward, so that the tongue portion comes into contact with the fixed contact, and the switch is switched.

Since the unit price of such a push switch is inexpensive, it is an important issue to reduce the manufacturing cost. Therefore, it is extremely important to reduce the number of parts or to improve work efficiency, but it is also necessary to ensure the stability of the switching operation, maintain or improve the quality.

[Patent Document 1] Japanese Patent No. 3890789

The present invention has been developed in order to solve the above problems, and an object of the invention is to provide a push button switch that can reduce the number of components and can improve work efficiency and ensure the stability of switching operation, compared with the conventional push switch. .

In order to achieve the above object, a push button switch according to the present invention includes: a housing having a housing portion; and a fixed contact portion that is inserted and fixed in such a manner that the fixed contact portion is exposed at the bottom of the housing. a contact piece; a movable contact piece that is separated from the fixed contact piece and inserted and fixed to the bottom of the housing; a dome-shaped skirt having a bendable extension; and a convex portion disposed at an inner center of the skirt, and is disposed on a rubber spring that fixes the contact piece and the movable contact piece and is housed in the accommodating portion; and is disposed above the rubber spring, and is provided with a button portion that can freely move up and down the housing, and the movable contact piece is provided with elasticity as a tongue piece a tongue piece which is formed to be bent upward and has an elastic force, and is provided at one end side thereof with a movable contact portion which is disposed apart from the fixed contact portion in a normal state and which is in contact with the fixed contact portion during a switching operation When the button portion is pressed to perform the switching operation, the rubber spring seat is deformed, and the convex portion is lowered to press the movable contact portion, so that the movable contact portion is in contact with the fixed contact portion, and on the one hand, When the push button portion, and the elastic tongues spring-elastic restoring rubber, restored to the normal state.

A support wall for supporting the rubber spring from the outer side is provided at the bottom of the casing, and the movement of the rubber spring in the radial direction is restricted by the support wall. When the push of the button portion is performed, the rubber spring is vertically bent upward, and the buckling portion is received. The gap portion on the inner side of the button portion is preferred.

The push button switch of the present invention is configured such that a movable contact piece and a fixed contact piece are inserted and fixed to the bottom of the casing, and in the movable contact piece, there is an elastic tongue as a tongue which is folded upward. The bending is formed and has an elastic force, and a movable contact portion that is disposed apart from the fixed contact portion in a normal state and that is in contact with the fixed contact portion during the switching operation is provided on one end side thereof. Therefore, it is possible to achieve a stable switching operation by inserting and fixing the movable contact piece to the bottom of the casing. Further, since the elastic tongue is formed in a movable contact piece by bending, the assembly process can be reduced, and the number of parts can be reduced, and the manufacturing cost can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the overall configuration of a push button switch of the present invention, wherein (a) is a top view of the same switch, (b) is a front view of the same switch, (c) is an inner view of the same switch, and (d) is a same switch; The side view, (e) is a cross-sectional view taken along line AA of the same figure (a), and (f) is a cross-sectional view taken along line BB of the same figure (a). 2 is a view showing a contact sheet substrate, wherein (a) is a plan view, (b) is a partial enlarged view of (a), (c) is a cross-sectional view taken along line A-A, and (d) is a cross-sectional view taken along line B-B. Fig. 3 is a top view for explaining a state in which a contact piece is insert-molded and fixed to a casing. Figure 4 is a view showing a housing in which a contact piece is inserted and formed, (a) is a top view, (b) is a front view, and (c) is (a) The cross-sectional view of the A-A line, (d) is a side view, (e) is a cross-sectional view taken along line B-B of (a), and (f) is an inner view. Fig. 5 is a view showing a bottom cover, wherein (a) is a top view, (b) is a front view, and (c) is a side view. Fig. 6 is a view showing a rubber spring, wherein (a) is a top view, (b) is a side view, (c) is a rear view, and (d) is a cross-sectional view taken along line A-A of (a). Fig. 7 is a view showing a button portion, wherein (a) is a top view, (b) is a front view, (c) is a cross-sectional view taken along line AA of (a), (d) is an inner view, and (e) is a side view; . Fig. 8 is a view for explaining an assembly process of the push button switch. Fig. 9 is a cross-sectional view for explaining an operation state of the push button switch, wherein (a) is a normal state and (b) is a switch operating state.

As shown in FIG. 1, the push button switch 1 is ideally used as a switch for operating various electronic devices, mainly by a contact piece 2 formed by a fixed contact piece 2A and a movable contact piece 2B. The casing 3, the bottom cover 4, the rubber spring 5, and the button portion 6 are configured as switches according to the following aspects.

In other words, the push button switch 1 is configured to include a housing 3 having a housing portion 31, a fixed contact portion 21A, and a fixed contact that is inserted and fixed so that the fixed contact portion 21A is exposed to the bottom portion 32 of the housing 3. a dot piece 2A; separated from the fixed contact piece 2A, and inserted into a movable contact piece 2B formed to be fixed to the bottom portion 32 of the casing 3; a dome-shaped skirt portion 51 having a bendable extension, and an inner side of the skirt portion 51 a central convex portion 52, and a rubber spring 5 disposed on the fixed contact piece 2A and the movable contact piece 2B and housed in the housing portion 31; and disposed above the rubber spring 5, the pair of housings 3 are freely disposed The button portion 6 for lifting and lowering.

Further, in the movable contact piece 2B, the elastic tongue piece 20B as a tongue piece is formed to be bent upward and has an elastic force, and is provided on the one end side thereof in a normal state, and is separated from the fixed contact portion 21A. When the movable contact portion 21B that is in contact with the fixed contact portion 21A during the switching operation is operated, when the button portion 6 is pressed to perform the switching operation, the rubber spring 5 is deformed and the convex portion 52 is lowered to move the movable contact portion 21B. When the pressing force is pressed, the movable contact portion 21B is brought into contact with the fixed contact portion 21A. On the other hand, when the pressing of the button portion 6 is released, the elastic tongue piece 20B and the rubber spring 5 are elastically restored to return to the normal state.

Normally, as shown in Fig. 9(a), the button portion 6 protrudes from the casing 3, and the pair of fixed terminals 20 and 20 are not electrically connected, and the push button switch 1 is turned OFF. Further, as shown in FIG. 9(b), when the button portion 6 is pushed in, the pair of fixed terminals 20, 20 are turned on, and the push button switch 1 is switched ON, and when the force is released, the button portion 6 is turned back. At the original position, the fixed terminals 20, 20 are cut off, and the push button switch 1 is switched OFF. Further, since the push button switch 1 uses the rubber spring 5 composed of rubber, the operation stroke is long compared to the switch having the metal deformation member, and when the operation is performed, the elasticity of the rubber can be obtained. Feedback feelings. Hereinafter, the structure of each member will be described in detail.

2 is a contact sheet substrate 200 in a state in which a sheet metal plate made of a conductive material such as copper or the like is subjected to press working, and the contact sheet substrate 200 contains a pre-cut separation. Contact patch 2 of the state. That is, as shown in Fig. 2(a), the contact piece substrate 200 is composed of two parallel line portions 201, 201, a plurality of contact pieces 2, 2, ‧ ‧ and a contact piece 2 and a line The connecting portions 202 and 203 are connected to the respective portions 201, and as will be described later, after the inserting and molding of the casing 3, the connecting portions 202, 202, 203, and 203 are cut and fixed to the bottom portion 32 of the casing 3.

As shown in FIG. 2(b), the contact piece 2 is composed of a fixed contact piece 2A and a movable contact piece 2B, and the fixed contact piece 2A is connected to the line by the connecting portions 202 and 202 positioned at the left and right sides thereof. Similarly, the movable contact piece 2B is also connected to the line portions 201 and 201 by the connection portions 203 and 203. However, the fixed contact piece 2A and the movable contact piece 2B are separated from each other and are not connected. .

The fixed contact piece 2A is a contact terminal 20 which is connected to a circuit pattern of an electric device and which is formed by bending, and a contact portion which is a movable contact portion 21B with the movable contact piece 2B, that is, The circular holes 22 and 22 for positioning are formed by the fixed contact portions 21A and 21A which are embossed into hemispherical shapes. The movable contact piece 2B is the same as the above-described fixed terminal 20 and the circular holes 22 and 22 for positioning, and is provided with a 180-degree bent and the movable contact portion 21B on the one end side thereof is located at the fixed contact portion. The upper portion of 21A, 21A tilts up the elastic tongue 20B formed obliquely upward.

The contact piece 2 composed of the fixed contact piece 2A and the movable contact piece 2B thus formed is insert-molded and fixed to the bottom portion 32 of the casing 3 by insert molding. . The connection portions 202, 202, 203, and 203 are cut from this state, and the cut portion is bent as the fixed terminal 20 in a state in which the contact piece 2 is inserted and fixed to the bottom portion 32 as shown in FIG. Housing 3.

The casing 3 is formed by injection molding a synthetic resin such as polyimide, and is formed into a box shape surrounded by the outer wall portion 34, and a pair of cards are provided on the inner wall surface of the outer wall portion 34. The claws 33, 33 are for preventing the button portion 6 from coming off. A housing portion 31 for accommodating the rubber spring 5 is provided inside the outer wall portion 34. In the accommodating portion 31, the support walls 35 having the circular arc faces 35A toward the center of the bottom portion 32 are arranged four on the four sides and are erected on the bottom portion 32, and the recessed portions 36 are formed by the four support walls 35, 35, 35, 35. . Further, a pair of locking claws 33, 33 are protruded from the outer wall surface of the outer wall portion 34 to prevent the bottom cover 4 from coming off.

The bottom cover 4 is formed by injection molding a synthetic resin such as polyimide or the like, and as shown in FIG. 5, the bottom plate 41 and the card which are erected on both ends of the bottom plate 41 are provided. The stoppers 42 and 42 are formed to cover the member for fixing the contact piece 2A and the movable contact piece 2B at the bottom portion 32 of the casing 3 to prevent the member from being exposed. The bottom cover 4 is attached to the casing 3 by the locking portions 42 and 42 being locked to the locking claws 33 and 33 of the casing 3.

As shown in Fig. 6, the rubber spring 5 is made of an elastic material such as ruthenium rubber or the like, and is formed into a cylindrical pressing portion 50, and a skirt portion 51 formed into a dome shape and connected to the lower portion and having a cavity therein. And a convex portion 52 provided below the pressing portion 50 in the inside of the skirt portion 51. The rubber spring 5 is configured such that when the top surface of the pressing portion 50 is pressed, the skirt portion 51 is deformed to form a switch ON state, and when the pressing is released, the elastic force of the rubber is restored to the original dome shape to form a switch OFF. status. In the ON state of the switch, the convex portion 52 presses the elastic tongue 20B from above.

The button portion 6 is formed in a box shape, and is formed by injection molding a synthetic resin such as polyamide or the like, and has a top plate portion 60 that is pressed from the outside and a top plate portion that is erected on the top plate portion. In the four vertical wall portions 61 of the 60, a pair of locking claws 62, 62 are protruded from the outer wall surface of the vertical wall portion 61 to prevent detachment from the casing 3. Further, as shown in Fig. 7(c), an annular crown portion 63 is formed at the center of the inner surface of the top plate portion 60, and the pressing portion 50 of the rubber spring 5 is fitted into the crown portion 63 as shown in Fig. 1(e). As shown, the rubber spring 5 is fixed to the center of the inside of the button portion 6. Further, a space portion 64 for receiving the bent portion of the rubber spring 5 is formed outside the crown portion 63.

Next, the assembly process of the components thus constructed will be described with reference to FIG.

As shown in FIG. 4, the case 3 in which the fixed contact piece 2A and the movable contact piece 2B are inserted and fixed to the bottom portion 32 is locked by the locking claws 33 and 33 and the locking portions 42 and 42. Install the bottom cover 4 below. Next, the rubber spring 5 is housed in the housing portion 31 of the casing 3. At this time, the lower end portion of the skirt portion 51 of the rubber spring 5 is placed on the bottom portion 32 of the casing 3 so as to be housed in the recess portion 36 surrounded by the four support walls 35, 35, 35, 35. From this state, the button portion 6 is covered from above the rubber spring 5. At this time, the pressing portion 50 of the rubber spring 5 is fitted into the crown portion 63 of the button portion 6, and the locking portions 62, 62 of the button portion 6 are locked with the locking claws 33, 33 of the housing 3, and the button portion 6 is opposed to the case. The body 3 can be installed freely up and down.

The push button switch 1 of the present invention is configured as described above, and the operation thereof will be described below. Fig. 9(a) shows a state in which no load is applied to the push button switch 1 without an external force. When there is no load, the rubber spring 5 extends the skirt portion 51 and stands on the bottom portion 32, and the top plate portion 60 of the button portion 6 protrudes from the casing 3 by the elastic force of the rubber spring 5. At this time, since the movable contact portion 21B of the elastic tongue 20B is separated from the fixed contact portions 21A and 21A of the fixed contact piece 2A, the left and right fixed terminals 20 and 20 are not electrically connected to each other, and the switch is in an OFF state.

On the other hand, FIG. 9(b) shows a state in which an external force is applied to the push button switch 1 and pressed. As described above, when the top plate portion 60 of the button portion 6 is pressed, a vertical downward force is applied to the rubber spring 5 fixed to the inner surface of the top plate portion 60, and the skirt portion 51 of the rubber spring 5 is deformed. At this time, since the skirt portion 51 of the rubber spring 5 is restricted in the radial direction by the support walls 35, 35, 35, 35 in the casing 3, only the inclined portion of the skirt portion 51 is flexed to expand vertically upward, and the buckling is performed. The portion is just received in the gap portion 64 inside the button portion 6. Further, when the skirt portion 51 of the rubber spring 5 is deformed, the pressing portion 50 sinks downward, so that the movable contact portion 21B of the elastic tongue 20B comes into contact with the fixed contact portions 21A, 21A of the fixed contact piece 2A. Thereby, the elastic tongue 20B is turned on between the fixed terminals 20 and 20, and the switch is switched to the ON state.

When the external force is released, the rubber spring 5 returns to the original dome shape by its own elastic force, and the elastic tongue 20B returns to the original state, and the button portion 6 rises, and returns to the position shown in Fig. 9(a). The original location shown. Thereby, the movable contact portion 21B of the elastic tongue piece 20B is separated from the fixed contact portions 21A and 21A of the fixed contact piece 2A, and the conduction between the left and right fixed terminals 20 and 20 is cut off, and the switch is switched to the OFF state.

Thus, according to the push button switch 1 of the present invention, the movable contact piece 2B and the fixed contact piece 2A are both inserted and fixed to the bottom portion 31 of the casing 3, and the movable contact piece 2B has the elastic tongue as the tongue. 20B, which is formed by bending upward and having an elastic force, is provided at one end side thereof in a normal state, and is disposed apart from the fixed contact portions 21A, 21A, and at the time of switching operation and the fixed contact portions 21A, 21A The movable contact portion 21B that is in contact. in this way, By inserting and fixing the movable contact piece 2B to the bottom portion 31 of the casing 3, a stable switching operation can be performed. Further, by bending and forming the elastic tongue piece 20B and providing it in the movable contact piece 2B, the assembly process can be reduced, and the number of parts can be reduced, and the manufacturing cost can be reduced.

1. . . Push button switch

200. . . Contact sheet substrate

201. . . Line department

2. . . Contact piece

2A. . . Fixed contact piece

20A. . . Fixed terminal

21A. . . Fixed contact

2B. . . Movable contact piece

20B. . . Elastic tongue

21B. . . Movable contact

3. . . case

31. . . Storage department

32. . . bottom

4. . . Bottom cover

5. . . Rubber spring

51. . . Skirt

52. . . Convex

6. . . Button section

61. . . Vertical wall

62. . . Claw claw

63. . . Crown

64. . . Void

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the overall configuration of a push button switch of the present invention, wherein (a) is a top view of the same switch, (b) is a front view of the same switch, (c) is an inner view of the same switch, and (d) is a same switch; The side view, (e) is a cross-sectional view taken along line AA of the same figure (a), and (f) is a cross-sectional view taken along line BB of the same figure (a).

2 is a view showing a contact sheet substrate, wherein (a) is a plan view, (b) is a partial enlarged view of (a), (c) is a cross-sectional view taken along line A-A, and (d) is a cross-sectional view taken along line B-B.

Fig. 3 is a top view for explaining a state in which a contact piece is insert-molded and fixed to a casing.

Fig. 4 is a view showing a housing in which a contact piece is inserted and formed, (a) is a top view, (b) is a front view, (c) is a cross-sectional view taken along line AA of (a), and (d) is a side view; Fig., (e) is a cross-sectional view taken along line BB of (a), and (f) is an inner view.

Fig. 5 is a view showing a bottom cover, wherein (a) is a top view, (b) is a front view, and (c) is a side view.

Fig. 6 is a view showing a rubber spring, wherein (a) is a top view, (b) is a side view, (c) is a rear view, and (d) is a cross-sectional view taken along line A-A of (a).

Fig. 7 is a view showing a button portion, wherein (a) is a top view, (b) is a front view, (c) is a cross-sectional view taken along line AA of (a), (d) is an inner view, and (e) is a side view; .

Fig. 8 is a view for explaining an assembly process of the push button switch.

Fig. 9 is a cross-sectional view for explaining an operation state of the push button switch, wherein (a) is a normal state and (b) is a switch operating state.

1. . . Push button switch

2. . . Contact piece

2A. . . Fixed contact piece

2B. . . Movable contact piece

3. . . case

4. . . Bottom cover

5. . . Rubber spring

6. . . Button section

20. . . Fixed terminal

Claims (2)

A push button switch comprising: a housing having a receiving portion; and a fixed contact portion, wherein the fixed contact portion is exposed to the bottom of the housing to be inserted into the fixed fixed contact piece; and fixed The contact piece is separated and inserted into a movable contact piece formed and fixed at the bottom of the casing; a dome-shaped skirt having a bendable extension and a convex portion disposed at the inner center of the skirt, and disposed on the fixed contact piece and movable a rubber spring that is placed on the contact piece and housed in the accommodating portion; and a button portion that is disposed above the rubber spring and that is freely movable up and down with respect to the housing, and the fixed contact piece and the movable contact piece before the insertion and fixation are attached The connection portion existing on the left and right sides is connected to the two parallel wire portions, and is formed in a state of being pressed from a thin metal plate. After the insert molding is performed toward the bottom of the casing, the connection portion is cut. And fixed to the bottom of the housing, the movable contact piece has a resilient tongue as a tongue, the elastic tongue is formed by bending upward and has an elastic force, and is disposed on the one end side thereof in a normal state. a movable contact portion that is disposed apart from the fixed contact portion and that is in contact with the fixed contact portion during the switching operation, when the button portion is pressed to perform a switching operation, the rubber spring seat is deformed, and the convex portion is lowered to move the movable contact portion Pressure, making the movable contact part and solid When the contact of the contact portion is made, on the one hand, when the pressing of the button portion is released, the elastic tongue and the rubber spring are elastically restored to return to the normal state. The push button switch of claim 1, wherein a support wall for supporting the rubber spring from the outer side is provided at a bottom portion of the casing, and is configured to restrict movement of the rubber spring in a radial direction by the support wall when the button is pressed When the portion is pressed, the rubber spring is bent upward vertically, and the bent portion is housed in the gap portion inside the button portion.