JP2013110056A - Press type switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press type switch capable of reducing abnormal sound generated when a movable contact member is elastically recovered.SOLUTION: A press type switch 1 comprises: a stationary contact 3 arranged at a bottom in a case 2; a movable contact member 5 having plural elastic support pieces 21, 22 supporting the movable contact 4 in an arrangement that it can approach to and can be separated from the stationary contact 3; and an operation member 6 arranged on the movable contact 4. Each of the elastic support pieces 21, 22 is elastically deformed in connection with a pushing operation of the operation member 6, so that the movable contact 4 comes into contact with the stationary contact 3. Each of the elastic support pieces 21, 22 is formed into a shape that spring constants are different from each other.

Description

  The present invention relates to a push-type switch used for a vehicle operation system panel, various electronic devices, and the like.

  Conventionally, this type of push-type switch includes a fixed contact disposed at the inner bottom of a synthetic resin case, a movable contact member having a movable contact disposed so as to be able to contact and separate from the fixed contact, and the movable contact facing downward. An operating member such as a key stem to be moved, and the movable contact member comes into contact with the fixed contact by elastically deforming the movable contact member in conjunction with the pushing operation of the operating member, and in conjunction with the release of the pressing force acting on the operating member. There is a known structure in which the movable contact member is elastically restored to move the movable contact away from the fixed contact (see, for example, Patent Document 1).

  As shown in FIG. 6, the movable contact member 100 is formed in a symmetrical shape with respect to the center line CL by punching and bending a metal plate having elasticity and conductivity. A pair of elastic support pieces 102 and 102 formed in parallel from the inner edge of the outer ring portion 101 and a movable contact 103 supported by both elastic support pieces 102 and 102 are integrally provided, and both elastic support pieces 102 and 102 are provided. By elastically deforming, the movable contact 103 moves so as to be able to contact and separate from the fixed contact.

JP 2007-323967 A

  However, in the conventional technology as described above, when the pressing force acting on the movable contact member is released and the movable contact member returns elastically, the return operation involves vibration.

  On the other hand, how to listen to the sound varies greatly depending on the frequency component of the transmission source, and generally has good sensitivity in the frequency range of 2 kHz to 5 kHz. Therefore, when the movable contact member elastically recovers, When a frequency component included in a specific frequency, that is, in a range of 2 kHz to 5 kHz, protrudes, the vibration sound may be easily heard by the human ear even if the sound pressure level is low, and the vibration sound may be recognized as an abnormal sound. was there.

  In addition, when such a push switch is mounted on a printed circuit board, and the printed circuit board is mounted on an electronic device or the like, the vibration sound resonates with the natural frequency at the mounting portion of the printed circuit board or electronic device. As a result, the operation sound may be impaired.

  Therefore, in view of such a conventional problem, the present invention has been made for the purpose of providing a push-type switch that can reduce noise generated when the movable contact member is elastically restored.

  The feature of the invention described in claim 1 for solving the conventional problems as described above and achieving an intended purpose is that a fixed contact disposed at the bottom of the case and an arrangement capable of contacting and separating from the fixed contact A movable contact member having a plurality of elastic support pieces for supporting the movable contact, and an operation member disposed on the movable contact, and each elastic support piece is elastically deformed in conjunction with a pushing operation of the operation member. Thus, in the push-type switch in which the movable contact comes into contact with the fixed contact, the elastic support pieces are formed in shapes having different spring constants.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the movable contact member includes an annular outer ring portion held in the case, and each elastic support piece includes the outer ring. A rising piece formed in a parallel arrangement with the proximal end supported on the inner edge of the portion, and a connecting piece connecting the movable contact and the rising piece arranged between the rising pieces It is in.

  According to a third aspect of the present invention, in addition to the structure of the second aspect, the length of each rising piece and / or connecting piece is different for each elastic support piece.

  A feature of the invention described in claim 4 is that, in addition to the configuration of claim 2 or 3, the width of each rising piece and / or connecting piece is different for each elastic support piece.

  As described above, the push switch according to the present invention has a fixed contact disposed at the bottom of the case, and a movable contact member having a plurality of elastic support pieces that support the movable contact in an arrangement that can be moved toward and away from the fixed contact. And an operation member disposed on the movable contact, and the movable contact member is brought into contact with the fixed contact by elastically deforming the movable contact member in conjunction with a pushing operation of the operation member. In the push-type switch, each elastic support piece is formed in a shape having different spring constants, so that the vibration of the movable contact member when returning elastically becomes complex, and a frequency component with high audible sensitivity protrudes. In addition, the vibration can be attenuated efficiently, and abnormal noise when operating the switch can be suppressed.

  In the present invention, the movable contact member includes an annular outer ring portion held in the case, and the elastic support pieces are parallel to each other with a base end side supported by an inner edge of the outer ring portion. By providing the rising piece formed in the arrangement, and the connecting piece for connecting the movable contact and the rising piece arranged between the rising pieces, even a small one can be elastically deformed The stroke of the part can be suitably secured, thereby making it possible to cope with a long life.

  Furthermore, in the present invention, the length of each rising piece and / or connecting piece is different for each elastic support piece, or the width of each rising piece and / or connecting piece is different for each elastic support piece. Thus, each elastic support piece can be suitably formed into a shape having a different spring constant.

It is a longitudinal section showing an example of a press type switch concerning the present invention. It is an AA line sectional view same as the above. It is an exploded perspective view same as the above. It is a top view which shows the terminal for center stationary contacts and the terminal for outer stationary contacts in FIG. (A) is a top view which shows an example of the movable contact member in FIG. 1, (b) is the same front view. It is a top view which shows an example of the conventional movable contact member used for a press-type switch.

  Next, an embodiment of the push switch according to the present invention will be described based on the embodiment shown in FIGS. In the figure, reference numeral 1 denotes a push switch.

  The push-type switch 1 moves the movable contact 4 downward, with a fixed contact 3 disposed on the inner bottom portion of the case 2, a movable contact member 5 having a movable contact 4 disposed so as to be able to contact with and separate from the fixed contact 3. An operation member 6 such as a key stem and an elastic body 7 such as a rubber for urging the operation member 6 in the push-up direction are provided. As shown in FIG. 3, the movable contact member 5, the elastic body 7 and the operation member 6 is incorporated, and the movable contact member 5 is elastically deformed in conjunction with the pushing operation of the operation member 6, whereby the movable contact 4 comes into contact with the fixed contact 3 to turn on the switch, and the pressing force acting on the operation member 6 Accordingly, the movable contact member 5 is elastically restored, and the movable contact 4 is separated from the fixed contact 3 to turn off the switch.

  The case 2 is formed in a hollow box shape having an insulating resin material and an upper surface portion opened, and a circular concave hole-shaped member housing portion 8 into which the movable contact member 5 is inserted is formed in the inner bottom portion.

  Further, in this case 2, the center fixed contact terminal 10 and the outer fixed contact terminal 11 are integrally incorporated in the bottom portion by insert molding in the arrangement shown in FIG. The fixed contact 3 formed integrally with the contact terminal 10 is exposed, and the connection portions 15a to 15d of the outer fixed contact terminal 11 are exposed outside the fixed contact 3 of the member housing portion 8 in the horizontal direction. Yes.

  The center fixed contact terminal 10 is formed with a conductive metal material, a disk-shaped fixed contact portion 12 having a convex fixed contact 3 formed at the center, and a connection terminal portion 13 exposed on the bottom surface of the case 2. The embedded contact portion 14 for connecting the fixed contact portion 12 and the connection terminal portion 13 is integrally provided.

  On the other hand, the outer fixed contact terminal 11 is formed with a conductive metal material, and when integrated with the case 2, a plurality of contact portions 15a to 15d disposed on the outer peripheral side in the horizontal direction of the fixed contact 3, The connecting portions 16 and 17 that connect the contact portions are integrally provided with a connection terminal portion 19 exposed on the bottom surface of the case 2 that is connected to the outer edge of the connecting portion 17 via a bent portion 18.

  Further, the movable contact member 5 is inserted into the member accommodating portion 8 and connected to the outer fixed contact terminal 11, and the movable contact 4 is arranged so as to be able to contact and separate from the fixed contact 3.

  The movable contact member 5 is formed by punching a metal plate having elasticity and conductivity into a shape shown in FIG. 5A and bending it as shown in FIG. 5B. The ring portion 20, a pair of elastic support pieces 21 and 22 supported in parallel with the outer ring portion 20, and the movable contact 4 supported by both elastic support pieces 21 and 22 are integrally provided. In addition, what consists of materials which have elasticity, such as a Corson type | system | group phosphor bronze, phosphor bronze, titanium copper, can be used for the above-mentioned metallic plate material.

  The outer ring portion 20 is formed in an annular shape, and is accommodated in the member accommodating portion 8 so that the bottom surface is in contact with the contact portions 15 a to 15 d exposed at the inner bottom surface of the member accommodating portion 8.

  Each elastic support piece 21, 22 is formed in a shape having a different spring constant, and the rising pieces 23, 24 formed in parallel with each other by supporting the proximal end on the inner edge of the outer ring portion 20, and both rising pieces The movable contact 4 is arranged between the raised pieces 23 and 24, and the connecting pieces 25 and 26 are connected to the raised pieces 23 and 24. The raised pieces 23 and 24 and the movable contact 4 are connected to the raised pieces 23 and 24 via the connected pieces 25 and 26, respectively. Are arranged in a switchback shape.

  Each rising piece 23, 24 is formed in an arc shape in plan view, and has a shape in which the distal end side is raised obliquely upward with the folds 23b, 24b of the base end portions 23a, 24a as the base axis. The rising pieces 23 and 24 are formed in shapes having different radii of curvature, widths of the base end portions 23a and 24a, circumferential lengths, and the like. Specifically, the rising piece 23 has a smaller radius of curvature, a wider base end portion 23a, and a shorter circumferential length than the rising piece 24.

  The connecting pieces 25, 26 are formed in a shape turned back from the distal end side to the proximal end side of the elastic support pieces 21, 22. It is formed in a shape that rises from the side and rises obliquely upward from the pieces 23 and 24. Each connecting piece 25, 26 is formed in a shape with different lengths and radii of the edge portions 25b, 26b. Specifically, the connecting piece 25 is shorter than the connecting piece 26 and has a larger radius of the edge portion 25b.

  The movable contact 4 is formed in a shape in which semi-discs having different radii are integrated, and is raised obliquely upward from the rising pieces 23 and 24, and is spaced apart from the outer ring portion 20 by a certain distance. The arrangement is inclined diagonally downward.

  Thus, the movable contact member 5 has an asymmetric shape with respect to the center line CL, and is formed such that the spring constant of one elastic support piece 21 is higher than that of the other elastic support piece 22. A higher natural frequency can be obtained as compared with a shape in which the shape on the 24th side is arranged symmetrically with respect to the center line CL (see the conventional example shown in FIG. 6).

  The operation member 6 is formed in a hollow box shape having a flat top plate portion 30 and a peripheral wall portion 31 having a shape raised downward from the periphery of the top plate portion 30 and having an open lower surface side. A cylindrical pressing portion 32 that protrudes downward is formed on the bottom surface side, and the pressing portion 32 is always in contact with the upper surface portion of the elastic body 7.

  Further, the operation member 6 includes a guide portion 33 having a shape protruding downward at the four corners of the peripheral wall portion 31 and a retaining claw 34 disposed at positions facing each other of the peripheral wall portion 31, and the guide portion 33 is provided as a case. 2 is moved up and down while being guided by the inner surface, and at a predetermined push-up position, a retaining claw 34 is locked to the upper edge of the groove 35 formed on the inner surface of the case 2 to prevent it from coming off.

  The elastic body 7 is formed of a rubber material having elasticity and insulation, and has a cylindrical head 40 and a thin tapered cylindrical skirt 41 that expands downward from the lower edge of the head 40. , And the lower end of the skirt portion 41 is inserted into the member accommodating portion 8, and a reaction force is applied to the inner bottom portion of the case 2 via the outer ring portion 20 of the movable contact member 5 to bias the operation member 6 upward. It is supposed to be.

  In the elastic body 7, the head 40 is pushed downward by pressing the operating member 6 downward, the skirt 41 is elastically deformed in conjunction with it, and the skirt 41 is inverted when pushed down to a predetermined position. Click feeling can be obtained.

  Further, the depressed head 40 comes into contact with the movable contact 4 to depress the movable contact 4 and pushes it down to a predetermined position, whereby the movable contact 4 and the fixed contact 3 come into contact with each other, and the switch is turned on.

  On the other hand, when the pressing force acting on the operation member 6 is released, the skirt portion 41 is elastically restored and returns to its original shape, is detached from the movable contact member 5, and the operation member 6 is pushed upward by the elastic force. Thus, the operation member 6 is returned to the original position.

  When the pressing switch 1 configured as described above depresses the operating member 6 against the elastic force of the elastic body 7, the head 40 of the elastic body 7 pressed by the operating member 6 contacts the movable contact 4. Then, the movable contact 4 is pressed downward, whereby the movable contact 4 comes into contact with the fixed contact 3 disposed on the inner bottom portion of the case 2 and the switch is turned on.

  On the other hand, when the pressing force acting on the operation member 6 is released, the elastic body 7 is elastically restored, and accordingly the operation member 6 is pushed back to the original position and the head 40 is detached from the movable contact member 5 (movable contact 4).

  Then, the movable contact member 5 which has become free after the head 40 is detached is elastically restored to its original shape while vibrating, whereby the movable contact 4 is detached from the fixed contact 3 and the switch is turned off.

  The vibration of the movable contact member 5 at the time of elastic return takes different vibration behaviors because the elastic support pieces 21 and 22 are formed in shapes having different spring constants. Since 22 are connected via the movable contact 4, they interfere with the vibration behavior of the other elastic support pieces, and the movable contact member 5 as a whole exhibits a vibration behavior in combination.

  Therefore, the vibration of the movable contact member 5 is suppressed from projecting a specific frequency component having high audibility and is converged with a high attenuation rate, so that the generation of abnormal noise can be suppressed.

  In addition, the shape of the movable contact member is not limited to the shape described in the above-described embodiment, and includes a plurality of elastic support pieces that support the movable contact, and each elastic support piece is formed in a shape having a different spring constant. If it is.

DESCRIPTION OF SYMBOLS 1 Push type switch 2 Case 3 Fixed contact 4 Movable contact 5 Movable contact member 6 Operation member 7 Elastic body 8 Member accommodating part 10 Central fixed contact terminal 11 Outer fixed contact terminal 12 Fixed contact part 13 Connection terminal part 14 Embedded part 15 Contact portions 16 and 17 Connection portion 18 Bending portion 19 Connection terminal portion 20 Outer ring portions 21 and 22 Elastic support pieces 23 and 24 Lifting pieces 25 and 26 Connection pieces 30 Top plate portion 31 Peripheral wall portion 32 Press portion 33 Guide portion 34 Claw 35 Groove 40 Head 41 Skirt

Claims (4)

A fixed contact disposed at the bottom of the case, a movable contact member having a plurality of elastic support pieces for supporting the movable contact in an arrangement detachable from the fixed contact, and an operation member disposed on the movable contact. A pressing switch in which the movable contact comes into contact with the fixed contact by elastically deforming each elastic support piece in conjunction with the pushing operation of the operation member;
Each of the elastic support pieces is formed in a shape having a different spring constant, and is a press switch.   The movable contact member includes an annular outer ring portion held in the case, and the elastic support pieces are raised in parallel with each other with the proximal end supported by the inner edge of the outer ring portion. The press-type switch according to claim 1, further comprising a piece and a connecting piece for connecting the movable contact disposed between the rising pieces and the rising pieces.   The push-type switch according to claim 2, wherein the length of each rising piece and / or connecting piece is different for each elastic support piece.   The press switch according to claim 2 or 3, wherein a width of each rising piece and / or connecting piece is different for each elastic support piece.

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