JPH0587777U - 2-stage action seesaw switch - Google Patents

Abstract

(57) [Summary] [Purpose] A two-stage action seesaw switch that reduces the size of the switch and improves contact. [Structure] Holding portions 7a, 7 having movable contacts 12a, 12b12c facing the three fixed contacts 4a, 4b, 4c.
b, 7c are provided on which the comb-shaped portions 14 are formed, respectively.
a pair of actuators 13a, 13 having a, 14b
b, the outer ends of the actuators 13a and 13b are fixed to the holding portions 7a and 7c, and the comb-shaped portions 14a and 14b are provided.
b is brought into contact with the holding portion 7b, and the jetty walls 21a and 21b of the push button 20 rotatably supported by the shaft 19 are attached to the actuator 1
It was touched by 3a and 13b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a two-stage action seesaw switch suitable for being applied to the operation of a power window of a car or a video camera.

[0002]

[Prior Art]

 As this type of switch, a switch as shown in FIG. 7A has been proposed. That is, the printed circuit board 32 is arranged on the mounting substrate 31, and four fixed contacts (hereinafter simply referred to as fixed contacts) 33a to 33d, which make up each pair, are provided substantially linearly on the printed circuit board 32. A flexible plate, for example, a rubber rubber 34 is provided so as to cover the movable contact (for example, conductive rubber) 35a to 35d corresponding to each fixed contact 33a to 33d. The fixed contacts 33a to 33d actually make a pair in the direction along the paper surface.

A push button 36 is arranged on the printed circuit board 32, and a substantially central portion in the longitudinal direction thereof is mounted by a shaft 37 so as to rotate like a seesaw with respect to the mounting substrate 31, and a shaft 38 a, Pressing plates 39a and 39b are attached so as to be rotatable about 38b, respectively, and the lower surfaces of both ends thereof are in contact with the upper surface of the flexible plate 34. In this case, the distances Ld and Le from the shaft 38a to the movable contacts 35a and 35b with respect to the pressing plate 39a are made different, for example, Ld <Le. The same applies to the pressing plate 39b.

In this configuration, when the left side of the push button 36 in the figure is pushed, it tilts in the counterclockwise direction, and the movable contact 35a comes into contact with the fixed contact 33a due to the relationship of Ld <Le to turn it on. However, the movable contact 35b does not contact the fixed contact 33b and remains off. This state is shown in FIG. 7B. Further, when the push button 36 is strongly pressed, the movable contact 35b comes into contact with the fixed contact 33b to turn it on. In this way, two-step switch operation is performed for one pressing force of the push button 36.

[0005]

[Problems to be solved by the device]

 In the case of such a configuration, since the pressing plate 39a is inclined in the state shown in FIG. 7B, the lower surface of the movable contact 35a does not come into contact with the entire upper surface of the fixed contact 33a, and a so-called one-side contact state occurs, resulting in poor contact. However, there are problems such as contact instability, deterioration of click feeling and abnormal noise. To avoid this, the distances Ld and Le may be set large, but this configuration has a problem that the entire switch becomes large. The present invention provides a two-stage seesaw switch that solves the above-mentioned problems.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, a printed circuit board in which three pairs of fixed contacts are formed in a substantially straight line and a fixed contact are provided corresponding to each fixed contact, and movable contacts are respectively provided. A flexible plate having three holding parts held therein, a pair of actuators having comb-shaped parts formed on edges facing each other and arranged so that they are always bite into each other, and three flexible plates. It consists of a push button that can be rotated like a seesaw around the fixed contact located in the center of the fixed contacts, and the lower surface of the outer part of each of the pair of actuators has three flexible plates. Each of the holding parts is brought into contact with or fixed to the outer holding part, the lower face of the comb-shaped part of the actuator is brought into contact with the upper face of the central holding part, and the lower face of the push button is provided with a pair of actuators. The upper surface of the motor in which the jetty contact pair is formed.

[0007]

【Example】

 An example of a two-step action seesaw switch according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, a plurality of claw pieces 2 are erected on the upper surface of a mounting board 1, and a printed circuit board 3 is engaged and fixed to the upper surface of the mounting board 1. A pair of fixed contacts (hereinafter, simply referred to as fixed contacts) 4a, 4b, 4c are printed. The printed circuit board 3 is covered with a flexible plate 5 made of rubber rubber, which includes a plate-shaped portion 6, movable contact holding portions 7a, 7b and 7c, and a plurality of protruding portions on the lower surface of the plate-shaped portion 6. The protrusions 8 are press-fitted and fixed in through holes 9 provided in the printed circuit board 3 (and also in the mounting substrate 1 if necessary).

The holding portions 7a, 7b, 7c of the flexible plate 5 are each composed of a conical portion 10 and a cylindrical portion 11 continuous with the conical portion 10 at positions corresponding to the fixed contacts 4a, 4b, 4c. Movable contacts, such as conductive rubbers 12a, 12b, and 12c, are fixed to the bottom surface of the cylindrical portion 11. In the normal state, the movable contacts 12a, 12b, 12c do not contact the fixed contacts 4a, 4b, 4c.

On the flexible plate 5, a pair of actuators 13a and 13b are arranged on substantially the same plane. These are formed with comb-shaped portions 14a and 14b at their opposite edges, and they are in a state of biting into each other, but in this state, a sufficient gap is provided so as not to touch the mating comb-shaped portion on the other side. , Or even if they are in contact with each other, their movements in the vertical direction (in the figure) are independent of each other. In the state where the pair of actuators 13a and 13b are arranged on the flexible plate 5, the holding portion 7a of the flexible plate 5 is in contact with the actuator 13a and the holding portion 7c is in contact with the actuator 13b. The upper surface of the portion 7b is in contact with the lower surfaces of the comb-shaped portions 14a and 14b of the actuators 13a and 13b, respectively.

In practice, as shown in FIG. 3, the fitting holes 15a and 15b are formed in the lower surfaces of the actuators 13a and 13b, and the cylindrical portions 11 of the holding portions 7a and 7c are press-fitted therein. In this case, as shown in the figure, when a plurality of protruding claws 16 are formed and placed in the fitting holes 15a and 15b, this press-fitted state can be more reliably maintained. Further, convex portions 17 are formed on the side surfaces of the actuators 13a and 13b, respectively, and the convex portions 17 are respectively guided to the front and rear side surfaces of the pair of walls 18 projecting on the mounting base plate 1, so that the actuators 13a and 13b are protected. It is configured to be positioned.

A push button 20 formed in a rectangular shape is provided so as to cover above the printed circuit board 3 described above, and a central portion in the longitudinal direction (near the central fixed contact 4 b) is formed on a pair of walls 18 of the mounting substrate 1. It is attached to the formed shaft 19 so as to rotate like a seesaw. On the lower surface of the push button 20, jetty walls 21a, 21b are integrally formed at positions equidistant from each other around the shaft 19, and in the steady state, the jetty walls 21a, 21b are in contact with the upper surfaces of the actuators 13a, 13b excluding the comb-shaped portions 14a, 14b. There is.

With respect to the left side of the shaft 19, when the distances from the shaft 19 to the movable contact 12a and the jetty 21a are La and Lb, and the distance from the movable contact 12a to the jetty 21a is Lc, La> Lb, Lb> Lc To be selected. The right side from axis 19 is similarly selected. The mounting substrate 1, the actuators 13a and 13b push buttons 20 are made of an insulating material such as ABS resin, and the printed circuit board 3 is made of paper phenol.

The switch having this configuration is normally in the state shown in FIG. 4A, and in this case, neither fixed contact is turned on. When the left side of the push button 20 is pushed as shown in FIG. 4B, the jetty 21a pushes the upper surface of the left actuator 13a. From the relationship of Lb> Lc, the actuator 13a is rotated counterclockwise around the holding portion 7b of the flexible plate 5 as a fulcrum, the holding portion 7a is pushed down, and the movable contact 12a comes into contact with the fixed contact 4a. Turn on.

When the push button 20 is further strongly pressed, as shown in FIG. 4C, the actuator 13a is rotated clockwise with the upper surface of the holding portion 7a as a fulcrum, and the holding portion 7b is also pushed down by the comb-shaped portion 14a of the actuator 13a. Then, the movable contact 12b comes into contact with the fixed contact 4b, which is also turned on. That is, two-step switch operation is performed by simply pressing the left side of the push button 20. The other actuator 13b does not operate at the time of each operation described above. When the right side of the push button 20 is pressed, the actuator 13b operates in the same manner as described above, and the actuator 13a does not operate at all.

When the actuator 13a is pressed (pressed down), the pressure is temporarily increased before the movable contact 12a comes into contact with the fixed contact 4a and before the movable contact 12b comes into contact with the fixed contact 4b. It is slightly lowered, and click action is obtained. This is the same when depressurizing the actuator 13a. This clicking action is due to the action of the conical portion 10 of the flexible plate 5. FIG. 4D shows this state with the pressure (P) plotted on the vertical axis and the stroke (S) plotted on the horizontal axis, where a is a curve during pressurization and b is a curve during depressurization.

According to this configuration, when the distance La shown in FIG. 1 is made equal to Lf shown in FIG. 7A, when the state shown in FIG. 4B is compared with the state shown in FIG. 7B, the fixed contact of the movable contact 12a is fixed. The contact state with 4a can be improved as compared with the conventional one. The reason is that the structure according to the present invention is equivalent to the fixed contact 33b and 33c of the conventional structure shown in FIG. 7A being integrated, and the length of the actuator 13a according to the present invention can be increased by that much. This is because the inclination of the actuator 13a in 4B can be made smaller than the inclination of the pressing plate 39a in FIG. 7B. In other words, the switch according to this invention can be made smaller than the conventional one.

In the example shown in FIGS. 1 and 3, the holding portions 7a and 7c of the flexible plate 5 are configured to be fixed in the fitting holes 15a and 15b of the actuators 13a and 13b, respectively. 5A and 5B, a convex bank 22 is formed on the upper surface of the cylindrical portion 11 of the holding portion 7a of the flexible plate 5 so that the cylindrical portion 11 has sufficient flexibility, and the lower surface of the actuator 13a. When the actuator is configured to simply contact the upper surface of the holding portion, the columnar portion 11 and the movable contact 12a are shown in FIG. 5B (the fixed contact 4a is omitted in this figure) as the actuator 13a is pushed down. As shown in FIG. 5C, the movable contact 12a first comes into contact with the upper surface of the printed circuit board 3 (actually, the upper surface of the fixed contact 4a) as shown in FIG. 5C. By further depressing the push button 20, the contact area of the movable contact 12a with the printed circuit board surface increases. The same applies to the holding portions 7b and 7c.

By adopting such a contact structure, the contact of the movable contact 12a with the printed circuit board 3 can be dispersed in time series as P1 → P2 → P3. FIG. 5F shows this state, in which the vertical axis indicates the pressure P applied to the push button 20, and the horizontal axis indicates the stroke S. In the figure, c is the conventional impact load curve, and d is the impact load curve of this example. As is clear from this, by adopting the above-mentioned configuration, it is possible to suppress the generation of impact sound.

Further, as shown in FIG. 6, by making the strokes Ra and Rb of the movable contacts 12a and 12b different (Ra ≠ Rb), or by making the load characteristics of the holding portions 7a and 7b different, You can change the operation feeling for 20. In the above description, the holding portions 7a, 7b, 7c are formed on one flexible plate 5, but the flexible plate 5 may be divided.

[0020]

[Effect of the device]

 According to the two-step action seesaw switch of the present invention, the distance between the fixed contacts adjacent to each other can be made longer than that of the conventional switch of this type, and accordingly, the inclination of the actuator at the time of pressing the first step is increased. It is possible to make it small, and it is possible to improve the contact of the movable contact with the fixed contact. Even if the adjacent fixed contacts are made equal to the conventional one, the distance between the fixed contacts 33b and 33c shown in FIG. 7A is 0 in the switch of the present invention. It has the effect of miniaturization.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a two-stage seesaw switch according to the present invention.

FIG. 2 is an exploded perspective view of a state where the push button of FIG. 1 is removed.

FIG. 3 is a perspective view showing an actuator which can be applied to the present invention by turning it over.

FIG. 4 is a schematic side view showing a fixed state of a two-stage seesaw switch according to the present invention, and B is a schematic side view showing a first stage operation state by a pressing operation; C is the second stage, and D is a curve diagram showing the relationship between pressure and stroke. ..

5A is a sectional view showing a part of a flexible plate and a movable contact applicable to the present invention, FIG. 5B is a sectional view showing a pressed state thereof, and C is a contact of the movable contact with a printed circuit board. It is an enlarged cross-sectional view showing a starting state, D is an enlarged cross-sectional view showing a further pressed state, C is an enlarged cross-sectional view showing a finally pressed state, and F is an operation according to this configuration. FIG. 6 is a waveform diagram illustrating FIG.

FIG. 6 is a cross-sectional view showing a positional relationship of movable terminals attached to a flexible plate with respect to a printed circuit board.

FIG. 7 is a sectional view showing a conventional two-stage seesaw switch, and B is a sectional view showing a part thereof in an operating state.

Claims (1)

[Scope of utility model registration request] 1. A printed circuit board in which three fixed contacts forming a pair are formed in a substantially straight line, and three holding members which are provided corresponding to the fixed contacts and respectively hold movable contacts. A flexible plate having a portion, a pair of actuators in which comb-shaped portions are formed on the edges facing each other so that they are always biting into each other, and the center of the three fixed contacts And a push button provided so as to be able to rotate like a seesaw around a fixed contact located at a position below the lower surface of the outer portion of each of the pair of actuators. Of the actuators, the lower surface of the comb-shaped portion of the actuator is brought into contact with the upper surface of the central holding portion, and the lower surface of the push button is provided with the pair of actuators. Characterized by the formation of a jetty facing each other on the upper surface of the
Dan action seesaw switch.