JP2000207984A - Switching structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switching structure that can reduce the number of components reduce assembly manhours to reduce cost and reduce the height of a switch body to facilitate its miniaturization. SOLUTION: A crimp part 12 is thermally crimped and prostrated inside with the back surface of a flat part 32 abutted on the end surface part of a circumferential wall part 10 of a base 1, by inserting and engaging an engaging part 34 of a lid body 3 with an engaging slot part 11 of the base 1. A crimp jointing part 33 is nipped between the crimp part 12 and the end surface part of the circumferential wall part 10 of the base 1, while abutting the crimp part on the crimp jointing part 33 of the lid body 3 so that the lid body 3 is mounted on the base 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch structure such as a tactile switch used for an input operation unit of an electronic device.

[0002]

2. Description of the Related Art As a conventional tactile switch, there is a technique disclosed in Japanese Utility Model Laid-Open Publication No. 3-8827. According to the disclosed technique, as shown in FIG. 6, a base 42 in which movable spring members 41 </ b> A, 41 </ b> B and the like that conduct electrical connection between one fixed contact and the other fixed contact (both not shown) are stored in an inner bottom portion 40. A dustproof sheet 43 made of rubber is placed on the upper opening of the device, and is further pressed down from above by a metal cover 44.

[0003]

However, in the above-described conventional tactile switch, a rubber dust-proof sheet 43 is placed on the upper opening of the base 42 and pressed down from above by a metal cover 44. Due to the structure, the number of parts is increased, the number of assembly steps is increased, and the cost is increased. In addition, the height dimension H of the switch body of the tactile switch is increased, There was a problem that miniaturization was difficult.

[0004] Further, the dust-proof sheet 43 is attached to the metal cover 4.
4, the dustproof structure is difficult to be obtained, and the movable spring member 41A is pressed by pushing the dustproof sheet 43 from the hole 44A provided at the center of the cover 44.
When the switch is operated by pressing the switch 41B, there is a problem that the center of the movable spring members 41A and 41B cannot be pressed if the pressing position is shifted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the number of parts, reduce the number of assembly steps, and reduce the cost. It is another object of the present invention to provide a switch structure capable of reducing the height of the switch body and making it easy to reduce the size.

[0006]

According to a first aspect of the present invention, there is provided a switch structure for connecting and disconnecting one fixed contact to another fixed contact by inverting and returning a movable spring member. A base that houses the switch part to be
In a switch structure having a lid covering the opening of the base, the lid is formed of a single elastic body, and the lid is fixed to a peripheral portion of the opening of the base.

With this configuration, the number of parts can be reduced because the lid is made of a single elastic body instead of the conventional lid made of a rubber dust-proof sheet and a metal cover. In addition, the number of assembling steps can be reduced and the cost can be reduced, and the height of the switch body can be reduced, so that the size can be easily reduced.

In order to achieve the above object, a switch structure according to a second aspect of the present invention, in the switch structure according to the first aspect, presses the lid against the movable spring member of the switch portion. And a fixed portion connected to a peripheral edge of the movable portion via a constricted portion and fixed to a peripheral edge of the opening of the base.

With this configuration, not only can the same operation and effect as those of the first aspect of the present invention be achieved, but also by pressing the movable portion in the lid made of a single elastic body. The movable portion can be moved at the constricted portion with respect to the fixed portion to operate the movable spring member of the switch portion.

In order to achieve the above object, a switch structure according to a third aspect of the present invention is the switch structure according to the second aspect, wherein the fixed portion of the lid is provided on the outer periphery of the movable portion. A caulking fastening portion is formed on the outer peripheral portion of the flat portion located at a position, and an engaging portion is formed on the outer peripheral portion of the flat portion so as to protrude to the opposite side to the caulking fastening portion, and the base is formed. An engaging groove portion and a caulking portion located outside the engaging groove portion are formed outside the peripheral wall portion surrounding the inner bottom portion, and the engaging portion of the lid is inserted into the engaging groove portion. Then, in a state where the back surface of the flat portion is in contact with the end surface portion of the peripheral wall portion, the caulking portion is caulked and brought into contact with the caulking fastening portion, and the caulking fastening portion is connected to the caulking portion and the peripheral wall portion. And the lid is fixed to the base.

According to this configuration, not only the same operation and effect as the above-mentioned operation and effect of the first aspect of the invention can be obtained, but also the engaging portion of the lid is inserted into and engaged with the engaging groove so that the rear surface of the flat portion is covered with the peripheral wall. In the state where it is in contact with the end face of the part, the swaged part is swaged and the swaged part is brought into contact with the fastening part, and the swaged part is sandwiched between the swaged part and the end face part of the peripheral wall part, and the lid is used as a base. By fixing, a reliable dustproof structure can be implemented.

According to a fourth aspect of the present invention, there is provided a switch structure according to the second or third aspect of the present invention, wherein the lid is provided at a center of a back surface of the movable portion of the lid. And a projection for operating the movable spring member of the switch section.

With this configuration, not only can the same operation and effect as those of the first aspect of the invention be achieved, but also by providing a projection at the center of the rear surface of the movable portion of the lid, Even when pressed, a force is always applied to the projection, and the movable spring member of the switch can be operated.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a switch structure according to the present invention in an exploded state, FIG. 2 is a perspective view of the switch structure in a partially sectioned exploded state, and FIG. FIG. 3 (2) is a partially cross-sectional perspective view of the same switch structure after the cover is swaged, FIG. 4 is a perspective view of the cover in the switch structure, and FIG. 5 (1). Is a configuration explanatory view of the switch circuit, (2) of FIG.
(3) is an explanatory diagram of the operation of the switch circuit.

A switch body A of a tactile switch having a switch structure according to the present invention includes a base 1 in which a central fixed contact 16 and first and second fixed contacts 17 and 18 are insert-molded, a movable spring member 2, The switch unit is constituted by the central fixed contact 16, the first and second fixed contacts 17 and 18, and the movable spring member 2.

The base 1 is made of an insulating synthetic resin (PBT).
And a square shape in plan view.
have. The peripheral wall 10 surrounding the inner bottom 9 has a circular shape. Outside the peripheral wall 10, an engaging groove 11 concentric with the peripheral wall 10 is provided.
And a caulking portion 12 formed concentrically with the peripheral wall portion 10 and located outside the engaging groove portion 11. A fulcrum seat 13 is formed at the front and rear of the inner bottom 9, and a notch 14 is formed at the front and rear of the peripheral wall 10. 11 is connected to the fulcrum seat 13.

A contact portion 15 is provided on the left and right portions of the inner bottom portion 9.
Is formed on the inner bottom portion 9, and a central fixed contact 16 is located at the center of the inner bottom portion 9, and the first and second fixed contacts 17 are located before and after the central fixed contact 16. 1
8 are provided. Then, the first fixed contact 17
Is connected to the first terminal 19 for external lead-out and the second fixed contact 1
Reference numeral 8 denotes a second fixed terminal 1 connected to the second terminal 20 for external lead-out.
Reference numeral 6 is connected to third and fourth terminal portions 21 and 22 for external derivation, respectively.

The movable spring member 2 uses a material having high elasticity such as phosphor bronze or SUS as a base material, and has a surface made of Ag.
Processing has been applied. The movable spring member 2 has an annular peripheral portion 23 and a dome portion 25 connected to the left and right of the peripheral portion 23 via a connecting portion 24. A fulcrum portion 27 having a bent portion 26 is formed, and flat portions 28 are formed at left and right portions of the peripheral portion 23, respectively.

As shown in FIGS. 2 and 4, the lid 3 is integrally formed of a single elastic body, for example, a rubber sheet. The lid 3 has a disk-shaped lid main body 3A. The lid main body 3A is connected to a circular movable portion 29 and a fixed portion connected to a peripheral side of the movable portion 29 via a constricted portion 30. 3
The movable portion 29 is thicker than the constricted portion 30, and a projection 35 is provided at the center of the rear surface of the movable portion 29. Further, the fixed part 31 is
Has a flat portion 32 located on the outer periphery of the flat portion 32, and a caulking fastening portion 33 which is one step lower than the flat portion 32 is formed on the outer circumference of the flat portion 32. An engaging portion 34 that is perpendicular to the flat portion 32 is
The caulking portion 33 is formed so as to protrude to the opposite side.

The movable spring member 2 is disposed on the inner bottom 9 of the base 1 such that the fulcrum 27 of the peripheral portion 23 is in contact with the fulcrum seat 13 in front of and behind the inner bottom 9. In this case, the dome portion 25 of the movable spring member 2 is in a state of protruding upward.

The upper opening 1A of the base 1 is
Covered by That is, as shown in (1) of FIG. 3, the lid body 3
1 and the back surface 32a of the flat portion 32 is brought into contact with the end surface portion 10a of the peripheral wall portion 10 of the base 1, and the caulking portion 12 is heat caulked as shown in FIG. (Ultrasonic caulking) and fall down to make contact with the caulking fastening portion 33 of the lid 3, and the caulking fastening portion 33 is caulked to the caulking portion 1.
The cover 3 is attached to the base 1 so as to be sandwiched between the base 2 and the end face 10 a of the peripheral wall 10 of the base 1.

A projection 35 provided at the center of the back surface of the movable portion 29 of the lid 3 is in contact with the center of the dome 25 of the movable spring member 2.

Next, the operation of the tactile switch configured as described above will be described.

When the movable portion 29 of the lid 3 is pressed to dent the movable portion 29 and the central portion of the dome portion 25 of the movable spring member 2 is pressed by the projection 35, the pressing force is applied. The dome portion 25 sinks, and the dome portion 25
Before and after, the first and second fixed contacts 17 and 18 are in contact with the first and second fixed contacts 17 and 18 to close between the first and second fixed contacts 17 and 18 as shown in FIG.

Next, when the dome portion 25 is turned over and a click feeling is generated, the dome portion 25 comes into contact with the central fixed contact 16 so that the central fixed contact 16 and the first
The second fixed contacts 17 and 18 conduct, and the switch-on state is obtained as shown in FIG.

When the pressing force applied to the movable portion 29 of the lid 3 is removed, the movable spring member 2 returns to the original position by the self-returning force of the inverted dome portion 25, as shown in FIG. Return to switch off state.

In the embodiment of the invention described above, since the lid 3 is integrally formed of a single elastic body, for example, a rubber sheet, the number of parts can be reduced, and the number of assembly steps can be reduced. The cost can be reduced, and the height H of the switch body is reduced, so that the size of the switch is easily reduced.

Further, the engaging portion 34 of the cover 3 is
In a state where the back surface 32a of the flat portion 32 is in contact with the end surface portion 10a of the peripheral wall portion 10, the caulking portion 12 is heated and caulked to abut on the caulking fastening portion 33, and the caulking fastening portion 33 33 is fixed between the caulking portion 12 and the end surface portion 10a of the peripheral wall portion 10 and the lid 3 is fixed to the base 1,
A reliable dustproof structure can be implemented.

Also, by providing a projection 35 at the center of the back surface of the movable portion 29 of the lid 3, no matter where the movable portion 29 is pressed, a force is always applied to the projection 35, and the movable spring member 2 of the switch portion is pressed. Can be activated.

[0031]

As described above, according to the switch structure of the first aspect of the present invention, the cover is made of an elastic material instead of the conventional cover made of a rubber dust-proof sheet and a metal cover. Because it is composed of a single piece, the number of parts can be reduced, the number of assembly steps can be reduced, the cost can be reduced, and the height of the switch body can be reduced,
It is easy to reduce the size.

According to the switch structure of the second aspect of the present invention, not only the same effects as those of the first aspect of the present invention can be obtained, but also the lid body made of a single elastic body. By pressing the movable portion, the movable portion can be moved at the constricted portion with respect to the fixed portion to operate the movable spring member of the switch portion.

According to the switch structure of the third aspect of the present invention, not only the same effects as those of the first aspect of the present invention can be obtained, but also the engagement portion of the lid is formed in the engagement groove portion. In a state where the back surface of the flat portion is in contact with the end surface portion of the peripheral wall portion by insertion engagement, the caulking portion is caulked and brought into contact with the caulking fastening portion, and the caulking fastening portion is caulked and the end surface portion of the peripheral wall portion And the lid is fixed to the base, whereby a reliable dustproof structure can be implemented.

According to the switch structure of the fourth aspect of the present invention, not only the same effects as those of the first aspect of the present invention can be obtained, but also a projection at the center of the rear surface of the movable portion of the lid. Is provided, a force is always applied to the protrusions, regardless of where the movable portion is pressed, and the movable spring member of the switch portion can be operated.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of the switch structure in an exploded state with a partial cross section.

FIG. 3A is a partially sectional perspective view of the switch structure before the lid is swaged. (2) is the perspective view which carried out the partial cross section after caulking a lid in the switch structure.

FIG. 4 is a perspective view of a lid in the switch structure.

FIG. 5A is an explanatory diagram of a configuration of a switch circuit.
(2) and (3) are explanatory diagrams of the operation of the switch circuit.

FIG. 6 is a partially broken perspective view of a conventional switch structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Movable spring member 3 Lid 9 Inner bottom part 10 Peripheral wall part 10a End face part 11 Engaging groove part 12 Caulking part 29 Movable part 30 Constriction part 31 Fixed part 32 Flat part 32a Back surface 33 Caulking fastening part 34 Engaging part 35 Projection

Continued on the front page (72) Inventor Nobuhiro Tabe 10-Family Todocho Hanazono-ku, Kyoto-shi, Kyoto F-term (reference) in Omron Corporation 5G006 AA02 AB25 CB05 CD06 LB01 5G023 CA12 CA50

Claims (4)

[Claims] 1. A switch structure having a base housing a switch unit for separating one fixed contact from the other fixed contact by reversing and returning operations of a movable spring member, and a lid covering an opening of the base. A switch structure, wherein the lid is formed of a single elastic body, and the lid is fixed to a periphery of the opening of the base. 2. The lid is connected to a movable part of the switch part which presses the movable spring member through a constricted part on a peripheral side of the movable part, and is fixed to a peripheral part of the opening of the base. The switch structure according to claim 1, wherein the switch structure comprises: 3. A caulking fastening portion is formed on an outer peripheral portion of a flat portion located on the outer periphery of the movable portion, and the fixing portion of the lid body is formed with a caulking fastening portion on an outer peripheral portion of the flat portion. Is formed so as to protrude to the opposite side to form an engaging portion, outside the peripheral wall portion surrounding the inner bottom portion of the base, an engaging groove portion, and a caulking portion located outside the engaging groove portion. The caulking portion is caulked by crimping the caulking portion in a state where the engaging portion of the lid is inserted into and engaged with the engaging groove portion so that the back surface of the flat portion abuts on the end surface portion of the peripheral wall portion. 3. The fixing device according to claim 2, wherein the cover is fixed to the base by being brought into contact with a fastening portion, the fastening portion being clamped between the caulking portion and the peripheral wall portion.
2. The switch structure according to 1. 4. The switch structure according to claim 2, wherein a projection for operating the movable spring member of the switch is provided at a center of a back surface of the movable part of the lid.