JPH0451388Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention allows the key top to move smoothly without tilting no matter which part of the key top is pressed, and the fixed contact and the movable contact can come into contact and separate for on/off operation. Regarding the push button switch.

[Prior Art] As shown in FIG. 6, a conventional push button switch has a housing 23 in which a stem 21 is fixed perpendicularly to the center of the back surface of a key top 20 made of a hard resin material, and the stem 21 is mounted on a printed circuit board 22. The lower end of the stem 21 was supported by a rubber switch 25 on an inverted bowl. A pushbutton switch like this is called Keytop 2.
When 0 is pressed with a finger, the stem 21 is guided to the stem insertion hole 24 and lowered, and the rubber switch 25 is compressed and contracts, and the contacts of the rubber switch 25 come into contact with the contacts on the printed circuit board, turning it on. . When the finger is removed from the key top 20, the elastic force of the rubber switch 25 pushes the stem 21 and the key top 20 back to their original positions, causing the contacts to separate and turn off.

[Problem to be solved by the invention] In the conventional push-button switch described above, when the center of the key top 20 is pressed, force acts on the center of the stem 21, so there is no problem, but when the end of the key top 20 is pressed with a finger. In this case, the key top 20 will descend in an inclined state, and the greater the distance between the stem 21 and the stem insertion hole 24, the greater the rotational moment will act on the stem 21 and the stem insertion hole 2.
The problem was that the frictional resistance with the part corresponding to 4 increased, making the on/off operation of the push button slow.

This idea was made in view of the above circumstances.
The purpose is to provide a push button switch in which the key top descends in parallel and moves lightly no matter which part of the key top is pressed.

[Means for Solving the Problems] The push button switch according to the present invention forms an X-frame body formed by intersecting two rectangular frames in an X-shape and rotatably pivoting at an intermediate portion thereof. , the X frame body is installed on a printed circuit board so that one leg can slide on the board, and an elastic return member having a movable contact that can be moved toward and away from a position above a fixed contact on the printed circuit board is provided. The key top is supported by the elastic return member and the upper part of the X-frame body.

[Effect]

When you press any part of the key top with your finger, one of the upper parts of the rectangular frame slides on the back of the key top, using the X-shaped intersection of the X frame as a pivot point, and the legs of the rectangular frame move. One of the parts slides on the printed circuit board. At the same time as this rectangular frame deforms while sliding, the elastic return member having a movable contact is also compressed by the key top and the movable contact comes into contact with a fixed contact on the board, turning the switch on. During this time, if you press any part of the key top, it will descend while maintaining a parallel position and move lightly to turn on the switch.

On the other hand, when the finger is released from the key top, the X frame and the key top return to their original positions due to the elastic force of the elastic return member, and the movable contact separates from the fixed contact, turning the switch off.

[Example] An example of the present invention will be specifically described below based on the drawings.

Reference numeral 1 denotes a rectangular key top made of hard resin with a flat upper surface, and a protrusion 1a that hangs downward is formed at the center of the back surface of the key top. Reference numeral 2 denotes a plate-shaped upper holder made of hard resin, which is housed in contact with the back side of the key top 1, and has a protrusion through hole 2a bored in its center. Furthermore, a groove 2b into which the upper part of one of the X frame bodies 3 (to be described later) is fitted is formed at one upper end of the upper holder 2, and a stepped part is formed at the other upper end so that the other upper part of the X frame 3 can slide. A flat portion 2c is formed. The X frame body 3 has a pivoting protrusion 3d formed inside the middle of both ends 3c of the outer rectangular frame body 3a.
The inner rectangular frame 3b, which has a hole 3e in which d is rotatably fitted, is formed in the middle of both side parts 3f, and is assembled in an X-shape. Inner rectangular frame 3
The upper part of b is cut off to make it easier to insert the pivoting protrusion 3d into the hole 3e. The upper part of the outer rectangular frame 3a is fixedly attached to the groove 2b of the upper holder 2 without sliding, and the upper part of the inner rectangular frame 3b has a stepped flat part 2.
It is slidably supported by c. Further, the projection 1a of the key top 1 is passed through the projection through hole 2a of the upper holder 2, and the lower end of the projection 1a is attached to the hole 4a of the rubber switch 4, which will be described later. On the other hand, the legs 3g of the rectangular frame 3b inside the X frame 3
is rotatably fixed on the printed circuit board 5 by a first lower holder 6 having a downward U-shaped cross section. Also, the legs 3 of the rectangular frame 3a outside the X frame 3
h is held on the printed circuit board 5 in a slidable manner by a second lower holder 7 having a downward U-shaped cross section. Fixed contacts 8 formed on the printed circuit board 5
The rubber switch 4 is mounted on the printed circuit board 5 so that the movable contact 9 is located above the position corresponding to the position shown in FIG. The rubber switch 4 is shaped like an inverted bowl and made of rubber elastic material, and is designed to provide a click feeling.A movable contact 9 made of conductive rubber is formed on the inside of the rubber switch 4, and a protrusion of the key top 1 is formed on the top of the outside. A cylindrical portion 4b having a hole portion 4a for holding 1a is formed. In this example, the rubber switch 4 is used as the elastic return member 10, but the present invention is not limited to this, and a spring (not shown) or a leaf spring (not shown) may be used. It can be something.

Next, the operating state of the above configuration will be explained.

When you press any part of the key top 1 with your finger, the hole 3e on both sides 3f, which is the intersection of the X-shape of the X frame 3, is pressed.
The portion into which the pivoting protrusion 3d is pushed serves as a rotation fulcrum, and the upper part of the outer rectangular frame 3a is fixedly held in one place while rotating in the groove 2b of the upper holder 2. The upper part of the inner rectangular frame 3b slides on the stepped flat part 2c and moves in the direction of the arrow pointing in the lateral direction as shown in FIG. As the upper part of the inner rectangular frame 3b moves while sliding on the flat part 2c having a stepped part, the leg part 3g of the inner rectangular frame 3b moves to the first
While being held fixedly in one place while being rotated by the holder 6, the legs 3h of the outer rectangular frame 3a slide on the printed circuit board 5 in the direction shown by the arrow in FIG. It is held in a holder 7 (see Figures 3a, b and 4a, b). In this way, the upper part of the inner rectangular frame 3b of this X frame 3 and the leg 3h of the outer rectangular frame 3a move while sliding, respectively. The switch 4 is also pressed by the key top 1, and the protrusion 1a of the key top 1 presses the top of the rubber switch 4, causing the key top 1 to retract, and the movable contact 9 connects to the fixed contact 8 on the board 5.
to turn on the switch. While pressing the key top 1 with a finger, the key top 1 descends while always maintaining a parallel state and moves lightly to turn on the switch and gives a click feeling to the finger.

On the other hand, when you release your finger from the key top 1, the X frame 3 and the key top 1 return to their previous positions due to the elastic force of the rubber switch 4, and the movable contact 9 separates from the fixed contact 8, turning the switch off. .

[Effects of the invention] As can be seen from the above description, the present invention forms an X-shaped frame formed by intersecting two rectangular frames in an X-shape and rotatably pivoting at the intermediate part thereof. The X-frame body is installed on a printed circuit board so that one leg can slide on the board, and an elastic return member having a movable contact that can be moved toward and away from the fixed contact on the printed circuit board is attached above the position corresponding to the fixed contact on the printed circuit board. , the elastic return member and X
Since the key top is supported by the upper part of the frame, the key top descends in parallel no matter which part of the key top is pressed, and the key top can be moved easily, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an embodiment of the present invention, Fig. 2 is an exploded perspective view thereof, Figs. 3 a and b are side views showing the relationship before and after pressing the key top, and Figs. 4 a and 4 are 5 is a sectional view showing the relationship before and after pressing the key top, FIG. 5 is a perspective view showing the force acting on the X frame and the sliding direction, and FIG. 6 is a sectional view showing a conventional example. 1... Key top, 3... X frame, 3a... Outer rectangular frame, 3b... Inner rectangular frame, 3
g, 3h...leg, 4...rubber switch, 5...
...Printed circuit board, 8... Fixed contact, 9... Movable contact, 10... Elastic return member.

Claims (1)

[Scope of utility model registration request] An X frame is formed by intersecting two rectangular frames in an X shape and rotatably pivoting at the intermediate part thereof,
The X-frame body is installed on a printed circuit board so that one leg can slide on the board, and an elastic return member having a movable contact that can be moved toward and away from the fixed contact on the printed circuit board is attached above the position corresponding to the fixed contact on the printed circuit board. A push button switch characterized in that a key top is supported by the elastic return member and the upper part of the X frame.