JPH0927239A - Switch structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent malfunctioning of a switch even if a dial button is depressed at its edge by placing a surrounding buckling part which consists of two elastic bodies on a printed circuit board located around a support buckling part, and pointing the bottom of the button toward the support buckling part. SOLUTION: When a depressing force P is applied to the right end of a dial button 2, the side face of the button 2 comes into contact with a main-body upper cover 1 at a point C. When the depressing force P is removed, a frictional force works at the point C because of the elastic forces of a support buckling part 3 and a surrounding bucking part 9. In this case the elastic force of the buckling part 3 consists mainly of upward components. The elastic force of the buckling part 9 generates a couple according to the distance between the buckling part 3 and the surrounding support part 4 and tends to rotate the button 2 about the buckling part 3. Therefore the button 2 is rotated in the direction shown by the arrow X, and is restored to its initial state from a fitting hole 1a in the main body upper cover 1 as it resists the frictional force at the point C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch structure for a remote control of a communication terminal device, a television or the like or a button portion of a telephone.

[0002]

2. Description of the Related Art A conventional switch structure will be described below with reference to the drawings. In the following description, a switch structure used in a telephone will be described as an example, but since other switches such as a remote controller have substantially the same structure, the description thereof will be omitted. 6 is an external view of the telephone, FIG.
FIG. 8 is a cross-sectional view for explaining the switch structure of the dial button, FIG. 8 is a cross-sectional view for explaining the pressing of the dial button, and FIG. 9 is a cross-sectional view for explaining a failure of the dial button.

As shown in FIG. 6, this telephone has a structure in which a dial button 2 is arranged on an upper cover 1 of a main body of a housing. As shown in FIG. 7, the dial button 2 has a certain clearance so that the head of the dial button 2 is protruded from the fitting hole 1a of the upper cover 1 of the main body, and the dial button 2 is dialed with a bottom portion larger than the fitting hole 1a. The button 2 is structured so as not to come off from the upper cover 1 of the main body.

A skirt-shaped support buckling portion 3 is formed on a contact rubber, which is an elastic body, so as to push up the bottom portion of the dial button 2, and is mounted on the printed circuit board 4.
The support buckling portion 3 is, as shown in FIG.
Are crushed when they are pressed by the force P, and the conductive contacts 5 attached to the inner wall thereof come into contact with the wiring 6 and the wiring 7 on the printed circuit board 4, so that the wiring 6 and the wiring 7 are separated from each other. By electrically connecting via the conductive contact 5, the switch is turned on. Then, when the force P is removed, the dial button 2 is pushed up by the elastic force of the supporting buckling portion 3 to separate the conductive contact 5 from the wiring 6 and the wiring 7, and the switch is turned off. The conductive contact 4 is made of a material such as carbon.

[0005]

However, in the above-mentioned conventional one, when the end of the dial button 2 is depressed,
As shown in FIG. 9, the side surface of the dial button 2 and the side surface of the hole provided in the main body upper cover 1 come into contact with each other at points A and B, and a frictional force is generated at the contact points A and B. When the frictional force is larger than the elastic force Q of the support buckling portion 3, even if the pushing force P is removed, the dial button 2 does not return to the original state shown in FIG. There is a problem that the button 2 remains stuck. Therefore, depending on such a state, there is a problem that the switch malfunctions, such as when the conductive contact 5 does not contact the wiring 6 and the wiring 7 or remains in contact with the wiring 6 and the wiring 7.

[0006]

Therefore, according to the present invention, a bottom portion of a button having a diameter larger than that of a hole formed in a casing is put inside the casing, and a head portion of the button is fitted into the hole, and the bottom portion is A supporting buckling portion formed of an elastic body is arranged on the printed circuit board at a position facing the conductive buckling portion formed on the inner wall of the supporting buckling portion when the supporting buckling portion is bent by pressing the button. In a switch structure in which a switch is turned on by a wiring formed on the printed circuit board, a peripheral buckling portion formed of at least two elastic bodies is arranged on the printed circuit board around the supporting buckling portion, and The bottom of the button was opposed to the support buckling portion.

[0007]

With this structure, even when the frictional force generated when the button comes into contact with the housing when the end of the button is pressed is larger than the elastic force of the supporting buckling portion, when the pressing force is removed, By the couple force generated by the elastic force of the surrounding buckling portion, the original state can be restored.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A switch structure according to an embodiment of the present invention will be described below with reference to the drawings. In the following description, the switch structure used in the telephone will be described as an example.
Other switches such as a remote controller also have substantially the same structure, and thus the description thereof will be omitted. Further, the external appearance of the telephone is the same as that of the conventional case described with reference to FIG.

FIG. 1 is a sectional view for explaining the switch structure of the dial button, and FIG. 2 is a sectional view for explaining the pressing of the dial button. As shown in FIG. 1, the dial button 2 has a fixed clearance so that the head portion of the dial button 2 is protruded from the fitting hole 1a of the upper cover 1 of the main body, and the dial button 2 is dialed with a bottom portion larger than the fitting hole 1a. The button 2 is structured so as not to come off from the upper cover 1 of the main body.

A skirt-shaped support buckling portion 3 is formed on a contact rubber which is an elastic body so as to push up the bottom portion of the dial button 2 and is mounted on the printed circuit board 4.
As shown in FIG. 2, the support buckling portion 3 has a dial button 2
Are crushed when they are pressed by the force P, and the conductive contacts 5 attached to the inner wall thereof come into contact with the wiring 6 and the wiring 7 on the printed circuit board 4, so that the wiring 6 and the wiring 7 are separated from each other. By electrically connecting via the conductive contact 5, the switch is turned on. Then, when the force P is removed, the dial button 2 is pushed up by the elastic force of the supporting buckling portion 3 to separate the conductive contact 5 from the wiring 6 and the wiring 7, and the switch is turned off. The conductive contact 4 is made of a material such as carbon.

Reference numerals 8 and 9 denote peripheral buckling portions, which differ from the above-mentioned conventional example in that the peripheral buckling portions 8 and 9 are provided. The peripheral buckling portions 8 and 9 are formed integrally with the supporting buckling portion 3 by contact rubber so as to be symmetrical with respect to the supporting buckling portion 3. Further, as shown in the figure, the peripheral buckling portions 8 and 9 have a skirt shape, and in order to prevent the original switching operation of the dial button 2 from being suppressed, The height of the top surface is also low. In addition, such a top surface is shown in FIG.
Then, although it has a planar shape, the shape is not limited to this. Examples of other shapes will be described later.

On the other hand, the bottom portion of the dial button 2 is arranged so as to face the surrounding buckling portions 8 and 9, and when the dial button 2 is pressed down, the bottom surface of the surrounding buckling portions 8 and 9 is formed. It is possible to contact. The surrounding buckling portions 8 and 9 may be arranged around the supporting buckling portion 3 in any manner, and the number of the surrounding buckling portions 8 and 9 may be at least two. For example, at least one pair of peripheral buckling portions may be arranged symmetrically with respect to the supporting buckling portion 3, or a plurality of peripheral buckling portions may be appropriately arranged on the circumference around the supporting buckling portion. Alternatively, the inclination in the arranged direction may be absorbed. Specifically, when the two peripheral buckling portions are arranged symmetrically with respect to the support buckling portion, or when the three peripheral buckling portions are arranged on the circumference around the support buckling portion. Or when four peripheral buckling portions are arranged in a cross shape on the circumference around the supporting buckling portion.

Further, the support buckling portion and the peripheral buckling portion are not limited to the skirt shape and may have other shapes. here,
Although the case where the support buckling portion and the peripheral buckling portion are integrally formed by the contact rubber has been described, the support buckling portion and the peripheral buckling portion may be separately formed instead of being integrally formed. Next, the operation of the switch structure having the above-mentioned structure when a failure is prevented will be described. FIG. 3 is a cross-sectional view for explaining the operation of the dial button when blocking an obstacle.

When a pressing force P is applied to the right end in the figure, the side surface of the dial button 2 and the main body upper cover 1 come into contact with each other at a point C.
When the pressing force P is removed, a frictional force acts on the point C by the elastic force of the support buckling portion 3 and the peripheral buckling portion 9. At this time, the elastic force of the support buckling portion 3 is mainly an upward force. Further, the elastic force of the peripheral buckling portion 9 generates a couple with the distance between the supporting buckling portion 3 and the peripheral supporting portion 4, so that the dial button 2 is rotated with the supporting buckling portion 3 as a fulcrum. To do. Therefore, as shown in the drawing, the dial button 2 rotates in the direction of the arrow X, resisting the frictional force at the point C, and the main body upper cover 1
The dial button 2 is restored to the original state from the fitting hole 1a. In the figure, when a pressing force is applied to the left end of the dial button 2, the surrounding buckling portion 8 acts in the same manner as the surrounding buckling portion 9 to restore the original state, and therefore the description thereof is omitted. To do.

Finally, another shape of the top surface of the peripheral buckling portion will be described. 4 and 5 are exemplary views of the peripheral buckling portion. For example, as shown in FIG. 4, the top surface is provided with a slope, and the high slope portion is arranged so as to be on the outer peripheral surface side of the bottom of the button so that a couple is generated at the apex of the slope. The peripheral buckling portion 10 may be provided on the printed circuit board 4. Further, as shown in FIG. 5, a peripheral buckling portion 11 having a spherical top surface is provided on the printed circuit board 4, and a fitting portion 2a for fitting the spherical top surface is provided on the bottom of the dial button 2. You may make it formed in. By doing so, it becomes possible to set the recovery direction of the dial button 2 to a fixed direction. The fitting portion 2a may have a concave shape, a hole shape, or any shape as long as the top surface can be fitted.

According to the above embodiment, when the end of the dial button 2 is pushed down, even if the frictional force generated by the dial button 2 coming into contact with the upper cover 1 of the main body is larger than the elastic force of the supporting buckling portion, the pushing force is increased. When is removed, it becomes possible to restore the original state by the couple force generated by the elastic force of the surrounding buckling portion.

[0017]

As described above, according to the switch structure of the present invention, even if the frictional force generated by the contact of the button with the housing when the end of the button is pushed is larger than the elastic force of the supporting buckling portion. When the pressing force is removed, it is expected that the couple can be restored to the original state by the couple force generated by the elastic force of the surrounding buckling portion. Therefore, the effect of preventing the malfunction of the switch can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a switch structure according to an embodiment.

FIG. 2 is a sectional view of the embodiment when pressed down.

FIG. 3 is a sectional view of the embodiment when a failure is blocked.

FIG. 4 is an exemplary view of a surrounding buckling portion.

FIG. 5 is an exemplary view of a surrounding buckling portion.

[Figure 6] External view of the telephone

FIG. 7 is a cross-sectional view illustrating a switch structure of a conventional dial button.

FIG. 8 is a cross-sectional view illustrating when a dial button of a conventional example is pressed.

FIG. 9 is a cross-sectional view for explaining a conventional dial button failure.

[Explanation of symbols]

 1 Main body cover 1a hole 2 Dial button 3 Support buckling part 4 Printed circuit board 5 Conductive contact 6 Wiring 7 Wiring 8, 9, 10, 11 Surrounding buckling part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Umemura 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (8)

[Claims] 1. A bottom portion of a button having a diameter larger than a hole formed in a housing is put inside the housing, and a head portion of the button is fitted into the hole,
A support buckling portion formed of an elastic body is arranged on the printed circuit board at a position facing the bottom portion, and when the support buckling portion is bent by pressing the button, the conductivity provided on the inner wall of the support buckling portion. In a switch structure in which a switch is turned on by a sex contact and a wiring formed on a printed circuit board, a peripheral buckling portion formed by at least two elastic bodies is arranged on the printed circuit board around a supporting buckling portion. At the same time, the switch structure is characterized in that the bottom part of the button faces the support buckling part. 2. The switch structure according to claim 1, wherein the support buckling portion and the peripheral buckling portion have a skirt shape. 3. The switch structure according to claim 1, wherein at least one pair of peripheral buckling portions are arranged symmetrically with respect to the support buckling portion. 4. The switch structure according to claim 1, wherein the plurality of peripheral buckling portions are arranged on a circumference centered on the support buckling portion. 5. The switch structure according to claim 1, wherein the support buckling portion and the peripheral buckling portion are integrally formed. 6. The method according to claim 1, wherein the top surface of the peripheral buckling portion is formed in a spherical shape, and the fitting portion of the spherical top surface is formed in the bottom portion of the button. Characteristic switch structure. 7. The method according to any one of claims 1 to 5, wherein a slope is formed on the top surface of the peripheral buckling portion, and the high slope portion is arranged on the outer peripheral surface side of the bottom portion of the button. Switch structure characterized by. 8. The switch according to claim 1, wherein the support buckling portion is formed so that the top surface height of the buckling portion is higher than the top surface height of the surrounding buckling portion. Construction.