JP2011100678A - Push-button switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent unwanted vibration noises from occurring due to the vibration of a tongue piece part during a period of pressing operation. <P>SOLUTION: In a push-button switch 1 comprising a stem 5 that receives the pressing operation, a rubber spring 4 driven in accordance with the pressing operation to the stem 5, a movable contact plate 3 driven by the drive of the rubber spring 4, and a case 2 including an accommodation part 21 capable of accommodating the stem 5, the rubber spring 4, and the movable contact plate 3 and a fixed contact 22 in conduction with the movable contact plate 3, the movable contact plate 3 has a tongue piece part 32 that forms a contact part with the fixed contact 22 and at the tongue piece part 32, a plurality of projecting parts 34 that project to the side in opposition to the fixed contact 22 are formed and meanwhile, a projecting part 35 that projects to the side in opposition to the rubber spring 4 is formed and notched parts 36a, 36b to prevent sticking to the rubber spring 4 are provided in a region excluding the projecting part 34 and the projecting part 35. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pushbutton switch, and in particular, switching is performed by bringing a tongue piece portion of a movable contact body, which is mounted on various electronic devices and whose base portion is always in contact with a peripheral fixed contact, to a central fixed contact by pressing an elastic body. The present invention relates to a push button switch.

  Conventionally, in a pushbutton switch that is mounted on various electronic devices and performs switching by bringing a tongue portion of a movable contact body whose base portion is always in contact with a peripheral fixed contact into contact with the central fixed contact by pressing an elastic body, the central fixed contact portion In order to improve the contact stability with respect to the tongue, a plurality of protrusions are provided on the tongue piece, and all or a part of these protrusions can be point-contacted with the central fixed contact (for example, patent document) 1).

Japanese Patent Laid-Open No. 2004-103375, FIG.

  However, in the conventional push button switch as described above, the lower surface of the elastic body and the upper surface of the tongue piece may be in close contact during a pressing operation, and the tongue piece may stick to the elastic body. Then, when the elastic body returns to the initial position in response to the release of the pressing operation, the tongue piece portion vibrates by being released after being lifted up along with the movement of the elastic body, thereby causing unwanted vibrations. There is a problem that sound can be generated.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a pushbutton switch that can prevent the generation of undesired vibration noise associated with the vibration of the tongue piece during a pressing operation. .

  The pushbutton switch of the present invention includes an operation member that receives a pressing operation, an elastic body that is driven in response to a pressing operation on the operation member, a movable contact body that is driven by driving the elastic body, the operation member, And a case having a fixed contact that is electrically connected to the movable contact body, and the movable contact body forms a contact portion with the fixed contact. The tongue piece has a plurality of protrusions protruding to the side facing the fixed contact, and a protrusion protruding to the side facing the elastic body. The sticking prevention part which prevents sticking with the said elastic body is provided in the area | region except a part and a protrusion part, It is characterized by the above-mentioned.

  According to the above pushbutton switch, the sticking prevention portion can prevent the tongue piece from sticking to the elastic body, so that the pressing operation on the operation member is released and the tongue piece is lifted along with the return operation of the elastic body. Since the phenomenon can be prevented, a situation in which the tongue piece vibrates can be prevented, and undesired vibration noise can be prevented from being generated.

  For example, in the pushbutton switch, the sticking prevention portion is formed by a cutout portion formed by cutting out the plurality of protrusions. In this case, since the notch portion is formed in the tongue piece portion, the contact area of the tongue piece portion with the elastic body can be reduced, thereby effectively preventing the tongue piece portion from sticking to the elastic body. It becomes possible to do. Further, the sticking prevention part may be formed of a recess formed between the plurality of protrusions, or may be formed by an uneven shape on the surface. Also in this case, as in the case of forming the notch, the contact area of the tongue piece with the elastic body can be reduced, so that the tongue piece can be effectively prevented from sticking to the elastic body. Is possible.

  Further, in the pushbutton switch, the movable contact body includes the tongue piece portion, the annular portion, and a connection portion that connects the tongue piece portion and the annular portion, and the plurality of protrusions are equally spaced. It is preferable that two tongues are provided on the side of the tongue piece that is closer to the connection part, and one is provided on the side of the tongue piece that is far from the connection part. When the tongue piece has a flat plate shape, a situation may occur in which the fixed contact cannot be stably contacted depending on the processing state of the tongue piece. By providing a plurality of protrusions on the tongue piece as in the present invention, it is possible to contact the fixed contact at the top of the protrusion without being influenced by the processing state of the tongue piece. It becomes possible to improve the contact stability of the part. Furthermore, by arranging the three protrusions, a plurality of contact portions with respect to the fixed contact can be secured, so that it is possible to further improve the contact stability of the tongue piece with respect to the fixed contact.

  In particular, in the pushbutton switch, it is preferable that the protrusion is disposed at the center of the three protrusions, and the diameter of the protrusions is larger than the diameter of the plurality of protrusions. In this case, the protrusion and the plurality of protrusions are designed with the same diameter, and the positional relationship between these center points is more than that of the tongue piece having the same positional relationship as the present invention. Since the distance between the protrusions can be reduced, the flat surface between them can be reduced, and the contact area with the elastic body can be reduced.

  Further, in the pushbutton switch, it is preferable that the push button switch is disposed at the center of the three protrusions, and the protrusion amount of the protrusions is larger than the protrusion amounts of the plurality of protrusions. In this case, the amount of protrusion of the protrusion and the plurality of protrusions are designed to be the same, and the positional relationship of these center points is compared with the tongue piece having the same positional relationship as the present invention. Since the distance to be separated by the top of the protruding portion can be increased, a non-contact portion with the elastic body can be formed in the vicinity of the peripheral portion of the protruding portion, and the contact area with the elastic body can be reduced.

  Furthermore, in the above pushbutton switch, it is preferable that the notch is formed so as to enter the inner peripheral side of a virtual circle connecting the apexes of the three protrusions. By forming the notch in this manner, the contact area of the tongue piece with the elastic body can be reliably reduced, and the tongue piece can be more effectively prevented from sticking to the elastic body. It becomes.

  The pushbutton switch of the present invention includes an operation member that receives a pressing operation, a movable contact body that is driven in response to a pressing operation on the operation member, a storage unit that can store the operation member and the movable contact body, and the movable member A pushbutton switch that includes a case with a fixed contact that is electrically connected to the contact body, and that allows the operation member to slide along the side wall surface of the case in response to a pressing operation. The distance on the lower end side with respect to the side wall surface in the sliding contact portion of the operation member that is in sliding contact is shorter than the distance on the upper end side.

  According to the above pushbutton switch, the distance on the lower end side with respect to the side wall surface of the case at the sliding contact portion of the operation member is made shorter than the distance on the upper end side. When operated, the lower end portion of the operation member having the largest movement amount can be brought into contact with the side wall surface of the case before the upper end portion, so that the inclination of the operation member accompanying the pressing operation can be reduced, and the operation member It becomes possible to prevent rattling in the case.

  In the push button switch, an inclined surface inclined inward from the upper end portion to the lower end portion of the operation member is provided in the sliding contact portion, and the lower end portion of the sliding contact portion is along the inclination angle of the inclined surface. It is preferable to provide an inclined surface along the inclination of the inclined surface of the sliding contact portion on the side wall surface of the case while being arranged at a position outside the imaginary line. Thus, while providing the inclined surface along the inclination of the inclined surface of the sliding contact portion on the side wall surface of the case, the lower end portion of the sliding contact portion is outside the virtual line along the inclination angle of the inclined surface of the sliding contact portion. By disposing in the position, the distance on the lower end side can be made shorter than the distance on the upper end side of the operation member with respect to the side wall surface of the case without increasing the outer dimension of the operation member.

  In particular, in the pushbutton switch, the sliding contact portion is provided with a leg portion extending below the inclined surface of the sliding contact portion, and the inclined surface of the sliding contact portion is made to be more than the base portion of the leg portion. It is preferable to extend to the lower side. In this case, the leg portion can be easily bent with the end portion of the inclined surface as a fulcrum, so that the force applied to the leg portion with the contact with the side wall surface of the case is appropriately released while the operation member It is possible to reduce the inclination.

  In the pushbutton switch, it is preferable that the lower side portion of the inclined surface of the sliding contact portion in the leg portion of the sliding contact portion is linear. In this case, since the lower side portion of the inclined surface in the leg portion is formed in a linear shape, the mold structure is compared with the case where an inclined surface inclined to the side wall surface side of the case is formed in the portion. Since the operation member can be manufactured without making it complicated, the cost required for the mold manufacturing can be reduced.

  In the pushbutton switch, the lower end side of the sliding contact portion may be arranged at a position outside the upper end side. In this case, without requiring strict processing accuracy compared to the case where the lower end portion of the sliding contact portion is arranged inside the upper end portion, the distance on the lower end portion side with respect to the side wall surface of the case in the sliding contact portion, Since it can be reliably shortened from the distance on the upper end side, when a force to tilt the operating member is applied in accordance with the pressing operation, the lower end side of the operating member is surely placed on the case side before the upper end side. It can be brought into contact with the wall surface.

  According to the present invention, it is possible to prevent the tongue piece portion from sticking to the elastic body by the sticking prevention portion, so that the pressing operation on the operation member is released and the tongue piece portion is lifted along with the return operation of the elastic body. Therefore, a situation in which the tongue piece vibrates can be prevented, and unwanted vibration noise can be prevented from being generated.

It is a disassembled perspective view of the pushbutton switch which concerns on one embodiment of this invention. It is a perspective view which shows the external appearance of the pushbutton switch which concerns on the said embodiment. It is a top view which shows the external appearance of the pushbutton switch which concerns on the said embodiment. It is a sectional side view of the pushbutton switch in the continuous line AA shown in FIG. It is a sectional side view of the pushbutton switch in the continuous line BB shown in FIG. It is a schematic diagram of the vicinity of the sliding contact part of the stem which the pushbutton switch which concerns on the said embodiment has. It is the top view (a) and side view (b) of the movable contact plate which the pushbutton switch which concerns on the said embodiment has. It is a top view of the movable contact plate which concerns on the reference example of the said embodiment. It is a figure for demonstrating the contact area with respect to the rubber spring of the tongue piece part of the movable contact plate which the pushbutton switch which concerns on the said embodiment has. FIG. 10 is a side sectional view taken along a solid line EE shown in FIG. 9. It is a figure for demonstrating the contact area with respect to the rubber spring of the tongue piece part of the movable contact plate which concerns on the reference example of the said embodiment. It is a sectional side view in the continuous line FF shown in FIG. It is a schematic diagram of the vicinity of the sliding contact part of the stem which the pushbutton switch which concerns on the modification of the said embodiment has.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a pushbutton switch 1 according to an embodiment of the present invention. 2 and 3 are a perspective view and a top view showing an external appearance of the pushbutton switch 1 according to the present embodiment. FIG. 4 is a side sectional view of the pushbutton switch 1 along the solid line AA shown in FIG. FIG. 5 is a sectional side view of the pushbutton switch 1 along the solid line BB shown in FIG. 2 to 5 show an initial state in which the pushbutton switch 1 is not subjected to a pressing operation.

  As shown in FIG. 1, the pushbutton switch 1 according to the present embodiment includes a case 2 having a storage portion 21 for storing the components of the switch, and a movable contact plate as a movable contact body accommodated in the case 2. 3. A rubber spring 4 as an elastic body and a stem 5 as an operation member are included. The pushbutton switch 1 according to the present embodiment is mounted on, for example, a part of a handle for an automobile, and is preferably used for channel operation or volume adjustment of an audio device.

  The case 2 is formed, for example, by molding an insulating resin material, and generally has a box shape opened upward. The case 2 has a bottom surface portion 22 constituting the bottom surface of the pushbutton switch 1 and a side surface portion 23 as a side wall surface standing from a side edge portion of the bottom surface portion 22, and a storage portion 21 is provided therein. ing. A fixed contact 24 including a peripheral fixed contact 24a and a center fixed contact 24b is insert-molded on the bottom surface portion 22 (see FIG. 4). The peripheral fixed contact 24 a and the central fixed contact 24 b are embedded so that a part thereof is exposed from the bottom surface portion 22. The central fixed contact 24b is disposed at the center of the bottom surface portion 22, and the peripheral fixed contact 24a is disposed outside the central fixed contact 24b to constitute a common fixed contact. A part of the peripheral fixed contact 24a is led out from the vicinity of the lower end of the side wall surface 23 and is configured to be solderable to the surface of a printed circuit board (not shown).

  In addition, an engagement piece 25 provided so as to be engageable with a protruding piece 54 of a stem 5 described later is provided at a central portion in the vicinity of the upper end portion of the pair of side surface portions 23 facing each other. The engagement piece 25 restricts the movement of the stem 5 that is biased upward by the rubber spring 4 beyond a certain position. Furthermore, an inclined surface 26 that is slightly inclined inward from the upper end portion of the side surface portion 23 toward the lower end portion is provided on the inner wall of each side surface portion 23 near the corner portion of the case 2. The inclined surface 26 functions as a tapered surface for ensuring workability when the stem 5 is stored in the storage portion 21.

  The movable contact plate 3 is formed of a metal material having spring properties such as stainless steel or phosphor bronze. The movable contact plate 3 includes an annular portion 31 having an annular shape, a tongue piece portion 32 extending inward from an inner edge portion of the annular portion 31, and a connection for connecting the annular portion 31 and the tongue piece portion 32. It consists of the part 33. The annular portion 31 is provided with a diameter corresponding to the peripheral fixed contact 24 a embedded in the case 2, and a positioning piece 31 a for positioning in relation to the inner wall surface of the case 2 is provided on the outer edge portion thereof. ing. The tongue piece portion 32 is provided at a position corresponding to the center position of the annular portion 31, and generally has a circular shape in which a part thereof is cut out in a substantially fan shape.

  The rubber spring 4 is made of, for example, an insulating elastic material. The rubber spring 4 includes a pressed portion 41 that receives pressure via the stem 5, a leg portion 42 that extends from the pressed portion 41, and a pressing portion 43 that is provided on the back side of the pressed portion 41. It has (refer FIG. 4 about the press part 43). The pressed portion 41 has a generally disk shape, and has a flat surface portion 41a in surface contact with a pressing portion 53 of the stem 5 described later on the upper surface thereof. The leg portion 42 has a shape that extends downward from the peripheral edge of the pressed portion 53 slightly toward the outside. The pressing portion 43 is provided so as to protrude downward from the back surface of the pressed portion 41 and is disposed to face the tongue piece portion 32 of the movable contact plate 3 disposed on the bottom surface portion 22 of the case 2.

  The stem 5 is formed by molding an insulating resin material, for example, and has a box shape that is generally open to the lower side. The stem 5 has an upper surface portion 51 that receives a pressing operation by an operator, and a side surface portion 52 that hangs down from a side edge portion of the upper surface portion 51. A pressing portion 53 that presses the flat portion 41 of the rubber spring 4 is provided on the back surface side of the upper surface portion 51 (see FIG. 4 for the pressing portion 53). The pair of opposing side surface portions 52 is provided with a protruding piece 54 that protrudes outward at the center portion of the lower end portion thereof. These protruding pieces 54 are arranged at positions where they engage with the engaging pieces 25 provided on the side surface portion 23 of the case 2. Further, in the vicinity of the corner portion of the stem 5 in each side surface portion 52, a slidable contact portion 55 that protrudes slightly outward from the central portion of the side surface portion 52 is provided. The sliding contact portion 55 has an inclined surface 55a that is slightly inclined inward from the upper side toward the lower side, and a leg portion 55b that is formed on the lower side of the inclined surface 55a. The configuration of the sliding contact portion 55 will be described later.

  When the pushbutton switch 1 having these components is assembled, as shown in FIG. 2, the movable contact plate 3 and the rubber spring 4 are accommodated in the accommodating portion 21, and the stem 5 is exposed with a portion thereof being exposed. 21. In the push button switch 1 assembled in this way, a pressing operation can be received by a part of the stem 5 exposed from the case 2, and the stem 5 slides along the side surface portion 23 of the case 2 in accordance with the pressing operation. The rubber spring 4 is driven.

  As shown in FIG. 4, the movable contact plate 3 has the annular portion 31 placed on the peripheral fixed contact 24 a and the leg portion 42 of the rubber spring 4 placed thereon. The tongue piece portion 32 is disposed so as to be opposed to the central fixed contact 24b at a position slightly above the center fixed contact 24b. The pressing portion 43 of the rubber spring 4 is disposed at a position facing the tongue piece portion 32 with a certain distance. The stem 5 is in a state in which the pressing portion 53 is placed on the flat portion 41 a of the pressed portion 41 of the rubber spring 4 and is urged upward by the urging force.

  As shown in FIG. 3, the stem 5 is stored in the storage portion 21 in a state where the sliding contact portions 55 are arranged to face the inclined surface 26 of the side surface portion 23 of the case 2 at two locations near the corner portions. Has been. In the sliding contact portion 55, as shown in FIG. 5, the inclined surface 55a and the side surface of the leg portion 55b are arranged to face the inclined surface 26 of the case 2 with a slight gap therebetween. As shown in FIG. 5, the leg portion 55b is provided to extend downward in the lower portion of the sliding contact portion 55, and is thinner than the portion where the inclined surface 55a is formed. ing.

  Here, the configuration of the sliding contact portion 55 of the stem 5 will be described. FIG. 6 is a schematic view of the vicinity of the sliding contact portion 55 of the stem 5 included in the pushbutton switch 1 according to the present embodiment. 6 shows a cross section at the same position as FIG. 5 (that is, a solid line BB shown in FIG. 3). Further, in FIG. 6, the fixed contact 24 embedded in the case 2, the movable contact plate 3 and the rubber spring 4 are omitted.

  As shown in FIG. 6, the inclined surface 26 provided on the side surface portion 23 of the case 2 is slightly inclined inward from the upper portion toward the lower end portion. On the other hand, the inclined surface 55a of the sliding contact portion 55 is slightly inclined inward from the upper end portion of the stem 5 to an intermediate portion (more specifically, a portion below the center portion). The inclined surface 55 a of the sliding contact portion 55 is disposed to face the inclined surface 26 of the case 2, and has substantially the same inclination angle as that of the inclined surface 26. The leg portion 55 b is provided on the lower side portion of the sliding contact portion 55. The inclined surface 55a extends to a location C positioned below the base portion of the leg portion 55b. And the side surface of the leg part 55b located in the downward side of the inclined surface 55a is comprised by the surface perpendicular | vertical to the bottom face part 22 of case 2. As shown in FIG. With this configuration, the sliding contact portion 55 is configured such that the distance (L2) on the lower end side is shorter than the distance (L1) on the upper end side with respect to the inclined surface 26 of the case 2. Moreover, the outer side part of the lower end part of the leg part 55b is arrange | positioned in the position outside the virtual line D formed along the inclination angle of the inclined surface 55a. The reason why the inclined surface 26 and the sliding contact portion 55 are provided is to reduce the inclination of the stem 5 due to the pressing operation and prevent the rattling. A configuration for preventing such a shakiness of the stem 5 will be described later.

  In the pushbutton switch 1 having such a configuration, when the operator receives a pressing operation on the stem 5, the stem 5 is pushed down against the urging force of the rubber spring 4. When the pressing portion 43 of the rubber spring 4 reaches the tongue piece portion 32 of the movable contact plate 3 and the stem 5 is further pushed down, the lower surface of the tongue piece portion 32 comes into contact with the central fixed contact 22b. Thus, the peripheral fixed contact 22a and the central fixed contact 22b are brought into conduction via the tongue piece 32, and a switch-on signal is externally output from a part of the fixed contact 22 led out from the case 2.

  On the other hand, when the pressing operation on the stem 5 is released, the stem 5 is pushed up according to the urging force of the rubber spring 4 and returns to the initial position (position shown in FIG. 3). In this case, the tongue piece portion 32 of the movable contact plate 3 is released from the pressing force of the pressing portion 43 of the rubber spring 4 and returns to the initial position (position shown in FIG. 3). Thereby, the conduction state between the peripheral fixed contact 22a and the central fixed contact 22b via the tongue piece portion 32 is released, and the output of the switch-on signal is stopped.

  Here, the configuration of the movable contact plate 3 included in the pushbutton switch 1 according to the present embodiment will be described. FIGS. 7A and 7B are a plan view and a side view, respectively, of the movable contact plate 3 included in the pushbutton switch 1 according to the present embodiment. 7A and 7B show the movable contact plate 3 in an initial state where the pushbutton switch 1 is not subjected to a pressing operation.

  As shown in FIG. 7B, the tongue piece portion 32 and the connection portion 33 of the movable contact plate 3 are provided so as to extend slightly upward from the annular portion 31 arranged horizontally. And the tongue piece part 32 is comprised by the center fixed contact 24b so that contact / separation is possible by the contact / separation of the press part 43 accompanying the drive of the rubber spring 4. FIG. Plural (three in the present embodiment) protrusions projecting toward the fixed contact 24 embedded in the bottom surface of the case 2 (that is, the lower side shown in FIG. 7B) are formed on the lower surface of the tongue piece 32. The part 34 (34a-34c) is provided. On the other hand, a protrusion 35 is provided on the upper surface of the tongue piece 32 so as to protrude toward the rubber spring 4 (that is, the upper side shown in FIG. 7B). The plurality of protrusions 34 are provided to improve the contact stability of the tongue piece 32 of the movable contact plate 3 with respect to the central fixed contact 24b. On the other hand, the protruding portion 35 is provided to prevent the tongue piece portion 32 from sticking to the pressing portion 42 of the rubber spring 4 in accordance with the pressing operation.

  These protrusions 34 and protrusions 35 are formed by, for example, pressing the movable contact plate 3 and are provided in a shape that constitutes a part of a sphere. As shown in FIG. 7A, the protruding portion 35 is provided at the center portion of the tongue piece portion 32. On the other hand, the three projecting portions 34 a to 34 c are arranged at equal intervals on the lower surface of the tongue piece portion 32. Of these three protrusions 34 a to 34 c, two protrusions 34 a and 34 b are provided at positions close to the connection portion 33. The remaining protrusion 34c is provided at a position far from the connection portion 33, and is provided at a position opposite to the connection portion 33 with the protruding portion 35 interposed therebetween in plan view. By arranging the three protrusions 34a to 34c in this way, a plurality of contact portions with respect to the central fixed contact 24b can be secured, and therefore the contact stability of the tongue piece 32 with respect to the central fixed contact 24b is further improved. Is possible.

  As shown in FIG. 7A, the tongue piece portion 32 has a generally circular shape, and a pair of cutout portions 36a and 36b as sticking prevention portions are formed in a part thereof. The notches 36 a and 36 b have a substantially fan shape and are formed in a region excluding the three protrusions 34 a to 34 c and the protrusion 35 in the tongue piece 32. Specifically, the notch 36a is formed between the protrusion 34a and the protrusion 34c, and the notch 36b is formed between the protrusion 34b and the protrusion 34c. Part of these notches 36a and 36b is formed so as to enter inside a virtual circle (see the dotted line shown in FIG. 7A) connecting the apexes of the three protrusions 34a to 34c. Yes.

  These notches 36a and 36b reduce the surface area of the tongue piece 32 itself. By forming the notches 36 a and 36 b in the tongue piece portion 32 in this way, the contact area of the tongue piece portion 32 with respect to the pressing portion 43 of the rubber spring 4 can be reduced, and the tongue piece portion 32 becomes the pressing portion 43. It can prevent sticking to. As a result, when the pressing operation on the stem 5 is released and the rubber spring 4 returns to the initial position, the phenomenon that the tongue piece portion 32 is lifted along with the movement of the rubber spring 4 can be prevented. It is possible to prevent the occurrence of undesired vibration noise.

  In particular, in the tongue piece portion 32 according to the present embodiment, the cutout portions 36a and 36b are formed so that a part thereof enters the inside of an imaginary circle connecting the vertex portions of the three projection portions 34a to 34c. . By forming the notches 36 a and 36 b in this way, the contact area of the rubber spring 4 with the pressing portion 43 can be greatly reduced, and the tongue piece 32 sticks to the pressing portion 43 of the rubber spring 4. Can be effectively prevented.

  In this case, the diameter of the protrusion 35 is designed to be larger than the diameter of the protrusions 34a to 34c. As a result, the protrusion 35 and the protrusions 34a to 34c are designed with the same diameter, and the positional relationship between these center points is compared to the tongue piece 32 'having the same positional relationship as the present embodiment. Since the distance between the protrusion part 35 and the projection parts 34a-34c can be shortened, the flat surface between these can be reduced and the contact area with respect to the press part 43 of the rubber spring 4 can be reduced.

  Moreover, the protrusion amount in the protrusion part 35 is designed larger than the protrusion amount in protrusion part 34a-34c. As a result, the protrusions 35 and the protrusions 34a to 34c are designed to have the same protrusion amount, and the positional relationship between these center points is compared to the tongue piece 32 'having the same positional relationship as in the present embodiment. Since the distance by which the pressing portion 43 of the rubber spring 4 is separated from the top of the protruding portion 35 can be increased, a non-contact portion with the pressing portion 43 can be formed in the vicinity of the peripheral portion of the protruding portion 35, and the rubber spring 4. It becomes possible to reduce the contact area with respect to the pressing part 43.

  Here, the movable contact plate 3 according to the present embodiment is obtained with reference to the movable contact plate 3 ′ having a tongue piece portion 32 ′ similar to the tongue piece portion 32 of the movable contact plate 3 according to the present embodiment. The above effect will be described. FIG. 8 is a plan view of the movable contact plate 3 ′ according to the reference example of the present embodiment. In the movable contact plate 3 ′ shown in FIG. 8, the diameters of the protrusions 34a ′ to 34c ′ are designed to be the same as the diameters of the protrusions 34a to 34c of the tongue piece 32 according to the present embodiment. . Further, in the movable contact plate 3 ′ shown in FIG. 8, for the convenience of explanation, the configuration common to the movable contact plate 3 according to the present embodiment is identified by adding “′” at the end.

  In the tongue piece portion 32 'of the movable contact plate 3' shown in FIG. 8, the projections 34a 'to 34c' and the projection 35 'are designed with the same diameter and the same projection amount, and The positional relationship between these center points is the same as that of the tongue piece portion 32 according to the present embodiment. In the tongue piece portion 32 ′ shown in FIG. 8, unlike the tongue piece portion 32 according to the present embodiment, the notches 36a and 36b are not formed.

  FIG. 9 is a diagram for explaining a contact area of the tongue piece portion 32 of the movable contact plate 3 of the push button switch 1 according to the present embodiment with respect to the rubber spring 4. 10 is a side sectional view taken along the solid line EE shown in FIG. FIG. 11 is a diagram for explaining a contact area of the tongue piece portion 32 ′ of the movable contact plate 3 ′ with respect to the rubber spring 4 according to the reference example of the present embodiment. 12 is a side sectional view taken along the solid line FF shown in FIG. In addition, in FIGS. 9-12, it has shown about the movable contact plates 3 and 3 'of the state pressed by the rubber spring 4. FIG. In FIGS. 9 and 11, the contact area with the rubber spring 4 is indicated by hatching.

  In the tongue piece portion 32 of the movable contact plate 3 according to the present embodiment, as shown in FIG. 9, a partial region at the top of the protruding portion 35 and a partial region on the connecting portion 33 side in the tongue piece portion 32. The pressing springs 43 of the rubber spring 4 are in contact with the partial areas outside the protrusions 34a to 34c. On the other hand, in the tongue piece portion 32 ′ of the movable contact plate 3 ′ according to the reference example, as shown in FIG. 11, the tongue piece portion 32 ′ is abbreviated except for a partial region of the peripheral portion of the protruding portion 35 ′. The entire region is in contact with the pressing portion 43 of the rubber spring 4. Thus, in the tongue piece portion 32 of the movable contact plate 3 according to the present embodiment, the contact area of the rubber spring 4 with respect to the pressing portion 43 is smaller than that of the tongue piece portion 32 ′ of the movable contact plate 3 ′ according to the reference example. It can be greatly reduced, and it becomes possible to prevent the phenomenon that the tongue piece portion 32 is lifted with the returning operation of the rubber spring 4.

  The contact area of the tongue piece 32 with the pressing portion 43 of the rubber spring 4 is reduced by forming the pair of notches 36a and 36b in the tongue piece 32 and changing the diameter of the protrusion 35 to the protrusion. This is realized by designing it to be larger than the diameters of 34a to 34c and designing the projection amount of the projection 35 to be larger than the projection amounts of the projections 34a to 34c.

  That is, as shown in FIG. 10, when the diameter of the protrusion 35 is designed to be larger than the protrusions 34a to 34c, the clearance C1 between the protrusion 35 and the protrusion 34 can be reduced. Further, when the protruding amount of the protruding portion 35 is designed to be larger than the protruding amounts of the protruding portions 34 a to 34 c, the gap G <b> 1 between the flat portion of the tongue piece portion 32 and the top portion of the protruding portion 35 can be made large. Thereby, since the amount by which the pressing portion 43 of the rubber spring 4 is lifted by the top of the protruding portion 35 is large, a non-contact portion NC1 with the pressing portion 43 can be formed in the vicinity of the peripheral portion of the protruding portion 35. Further, since the protrusions 34a to 34c are arranged at positions close to the peripheral edge of the protrusion 35, it is possible to prevent a part of the pressing portion 43 from entering the upper surfaces (concave surfaces) of the protrusions 34a to 34c. it can. As a result, the contact area of the tongue piece portion 32 with the pressing portion 43 of the rubber spring 4 can be reduced.

For example, in the tongue piece portion 32 according to the present embodiment, in order to reduce the contact area of the rubber spring 4 with respect to the pressing portion 43, it is desirable to satisfy the following conditions. Here, for convenience of explanation, the diameter of the protrusion 35 is referred to as “D1”, and the diameter of the protrusion 34 is referred to as “D2”.
i) Diameter D1 / clearance C1 = 0.33 or more of the protrusion 35
iia) The diameter D1 of the protrusion 35 / the diameter D2 of the protrusion 34 is 1.1 or more.
iib) The diameter D1 / clearance C1 of the projecting portion 35 is equal to or greater than 1.5. When this condition is satisfied, the contact area of the rubber spring 4 with the pressing portion 43 can be reduced, and the rubber spring 4 can be restored. It is possible to effectively prevent a phenomenon in which the tongue piece portion 32 is lifted with the operation.

  On the other hand, as shown in FIG. 12, when the diameter of the protrusions 34a ′ to 34c ′ is designed to be the same as the diameter of the protrusion 35 ′, the clearance C2 between the protrusion 35 ′ and the protrusion 34 ′. Is larger than the clearance C1. Further, when the protruding amount of the protruding portion 35 ′ is designed to be the same as the protruding amount of the protruding portions 34a ′ to 34c ′, the gap G2 between the flat portion of the tongue piece portion 32 ′ and the top portion of the protruding portion 35 ′ is set. , Smaller than the gap G1. In this case, since the amount by which the pressing portion 43 of the rubber spring 4 is lifted by the top of the protruding portion 35 'is small, a small non-contact portion NC2 is formed in the vicinity of the peripheral portion of the protruding portion 35', but is shown in FIG. A non-contact portion as large as the non-contact portion NC1 is not formed. Further, since the protrusions 34a ′ to 34c ′ are arranged at positions far from the peripheral edge of the protrusion 35 ′, a part of the pressing part 43 enters the upper surface (concave surface) of the protrusions 34a ′ to 34c ′. Has not been able to prevent. As a result, the pressing portion 43 of the rubber spring 4 comes into contact with substantially the entire region of the tongue piece portion 32 ′, and the contact area with the pressing portion 43 cannot be reduced.

  As described above, in the pushbutton switch 1 according to the present embodiment, the tongue piece portion 32 is formed on the tongue piece portion 32 of the movable contact plate 3 by, for example, the sticking prevention portion including the notches 36a and 36b. Can be prevented from sticking to the pressing portion 43 of the rubber spring 4. As a result, the pressing operation on the stem 5 is released, and the phenomenon that the tongue piece portion 32 is lifted along with the returning operation of the rubber spring 4 can be prevented. It is possible to prevent the generation of sound.

  In the pushbutton switch 1 according to this embodiment, as described above, the side surface 23 of the case 2 is provided with the inclined surface 26, while the side surface 52 of the stem 5 is provided with the inclined surface 55 a and the leg portion 55 b. Providing the contact portion 55 prevents the stem 5 from rattling due to the pressing operation. For example, a push button switch that extends a leg portion provided at the lower end portion of the stem and inserts it into a recess portion provided in the case has been proposed as a means for preventing the rattling of the stem accompanying such a pressing operation. (Japanese Patent Laid-Open No. 2007-323967). However, in the conventional pushbutton switch having such a configuration, when the stem is arranged at the initial position, a portion where the stem and the wall surface of the recess overlap in the moving direction of the stem is required, and the movement amount of the stem is limited. Will be.

  In the pushbutton switch 1 according to the present embodiment, the inclined surface 26 is provided on the side surface portion 23 of the case 2, while the sliding contact portion 55 having the inclined surface 55 a and the leg portions 55 b is provided on the side surface portion 52 of the stem 5. The distance from the inner wall surface of the side surface portion 23 of the case 2 is made different between the upper end portion side and the lower end portion side of the sliding contact portion 55 of the stem 5, and more than the distance on the upper end side (“L1” shown in FIG. 6). The distance on the lower end side (“L2” shown in FIG. 6) is shortened. Thereby, when the force which inclines the stem 5 with a press operation acts, the lower end part of the stem 5 with the largest moving amount contacts the inner wall surface of the side part 23 of the case 2 before the upper end part. Therefore, the inclination of the stem 5 accompanying the pressing operation can be reduced, and rattling in the stem 5 can be prevented.

  In particular, an inclined surface 55a that is slightly inwardly inclined from the upper side to the lower side is provided in the upper portion of the sliding contact portion 55, and the side surface of the lower portion of the sliding contact portion 55 is the bottom surface portion 22 of the case 2. And a leg 55b that constitutes a vertical plane, and the lower end of the leg 55b is disposed outside the imaginary line D (see FIG. 6), while the inclined surface 55a of the slidable contact 55 on the side surface 23 of the case 2 is provided. An inclined surface 26 is provided. Thereby, it becomes possible to make the distance on the lower end side shorter than the distance on the upper end side of the stem 5 between the inner wall surface of the side surface part 23 of the case 2 without increasing the outer dimension of the stem 5. ing.

  Moreover, in the sliding contact part 55, since the inclined surface 55a is extended to the location C located below the base portion of the leg portion 55b, the leg portion 55b is easily bent with the location C as a fulcrum. Therefore, it is possible to reduce the inclination of the stem 5 while appropriately releasing the force acting on the leg portion 55b in contact with the inner wall surface of the side surface portion 23 of the case 2.

  Further, in the slidable contact portion 55, a portion disposed on the lower side of the inclined surface 55a, that is, a part of the side surface portion of the leg portion 55b has a linear shape. Since the stem 5 can be manufactured without complicating the structure of the mold as compared with the case where an inclined surface or the like that is inclined is formed, it is possible to reduce the cost required for manufacturing the mold. .

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the above embodiment, the case where the pair of cutout portions 36a and 36b are formed as the sticking prevention portion on the tongue piece portion 32 of the movable contact plate 3 has been described. Is not limited to this, and can be changed as appropriate. For example, the sticking prevention portion may be configured by a concave portion disposed below the flat portion of the tongue piece portion 32 at a position corresponding to the notches 36a and 36b. Further, the sticking prevention portion can be configured by the uneven shape formed on the surface of the tongue piece portion 32. In any case where the sticking prevention portion is configured as described above, the contact area between the tongue piece portion 32 and the pressing portion 43 of the rubber spring 4 can be reduced, and the piece portion 32 sticks to the pressing portion 43. It is possible to prevent this.

  Moreover, in the said embodiment, although the upper end part side is demonstrated on the assumption that the sliding contact part 55 of the stem 5 is arrange | positioned outside the lower end part side, about the structure of the sliding contact part 55, However, the present invention is not limited to this, and a configuration may be adopted in which the lower end side is disposed outside the upper end side. For example, such a configuration of the slidable contact portion 55 is such that the side surface that forms the vertical surface of the leg portion 55b with the bottom surface portion 22 is changed to an inclined surface that is inclined toward the side surface portion 23 side of the case 2 toward the lower side. This is realized.

  FIG. 13 is a schematic view of the vicinity of the sliding contact portion 55 of the stem 5 included in the pushbutton switch 1 according to a modification of the present embodiment. FIG. 13 shows a cross section at the same position as FIG. 6, and the fixed contact 24 embedded in the case 2, the movable contact plate 3 and the rubber spring 4 are omitted.

  In the sliding contact portion 55 shown in FIG. 13, the side surface on the lower side of the inclined surface 55 a in the leg portion 55 b has the inclined surface 55 c inclined toward the side surface portion 23 side of the case 2 toward the lower side. It differs from the sliding contact part 55 which concerns on a form. In this case, the outer portion of the lower end portion of the leg portion 55b having the inclined surface 55c is disposed outside the upper end portion of the sliding contact portion 55 (inclined surface 55a).

  In the sliding contact portion 55 shown in FIG. 13, the inclined surface 26 is provided on the side surface portion 23 of the case 2, while the sliding contact portion 55 having the inclined surface 55 a and the inclined surface 55 c is provided on the side surface portion 52 of the stem 5. The distance on the lower end side (L2 ′ shown in FIG. 13) is shorter than the distance on the upper end side (L1 shown in FIG. 13) in the sliding contact portion 55 of the stem 5. In this case, as in the above-described embodiment, the slidable contact portion 55 does not require strict processing accuracy compared to the case where the lower end portion side of the slidable contact portion 55 is disposed on the inner side of the upper end portion side. Since the distance on the lower end side with respect to the inner wall surface of the side surface portion 23 of the case 2 can be surely shortened compared to the distance on the upper end side, the stem is surely secured when a force for inclining the stem 5 is applied in accordance with the pressing operation. 5 can be brought into contact with the inner wall surface of the side surface portion 23 of the case 2 before the upper end portion side, and the inclination of the stem 5 accompanying the pressing operation can be reduced.

DESCRIPTION OF SYMBOLS 1 Pushbutton switch 2 Case 21 Storage part 22 Bottom part 23 Side part 24 Fixed contact 24a Peripheral fixed contact 24b Center fixed contact 25 Engagement piece 26 Inclined surface 3 Movable contact plate 31 Annular part 32 Tongue piece part 33 Connection part 34, 34a- 34c Projection part 35 Projection part 36a, 36b Notch part 4 Rubber spring 41 Pressed part 41a Plane part 42 Leg part 43 Press part 5 Stem 51 Upper surface part 52 Side part 53 Press part 54 Projection piece 55 Sliding part 55a Inclined surface 55b Leg 55c Inclined surface

Claims (13)

An operation member that receives a pressing operation, an elastic body that is driven in response to a pressing operation on the operation member, a movable contact body that is driven by driving the elastic body, and the operation member, the elastic body, and the movable contact body are stored. A possible storage part, and a case with a fixed contact that is electrically connected to the movable contact body,
The movable contact body has a tongue piece portion that forms a contact portion with the fixed contact, and the tongue piece portion is formed with a plurality of protrusions protruding to the side facing the fixed contact, A protruding portion that protrudes to the side facing the elastic body is formed, and a sticking prevention portion that prevents sticking to the elastic body is provided in a region excluding the protruding portion and the protruding portion. Push button switch.   The pushbutton switch according to claim 1, wherein the sticking prevention portion includes a cutout portion formed by cutting out the plurality of protrusions.   2. The pushbutton switch according to claim 1, wherein the sticking prevention part is formed of a recess formed between the plurality of protrusions.   2. The pushbutton switch according to claim 1, wherein the sticking prevention portion is formed by a concavo-convex shape on a surface.   The movable contact body includes the tongue piece portion, the annular portion, and a connection portion that connects the tongue piece portion and the annular portion, and the plurality of protrusions are provided at regular intervals. It consists of two protrusions, and two are provided on the side close to the connection part in the tongue piece part, while one is provided on the side of the tongue piece part far from the connection part. 5. The pushbutton switch according to any one of 4.   6. The push button switch according to claim 5, wherein the push button switch is arranged at the center of the three protrusions, and the diameter of the protrusions is larger than the diameter of the plurality of protrusions.   The push button switch according to claim 5 or 6, wherein the push button switch is arranged at a center of the three protrusions, and a protrusion amount of the protrusions is larger than a protrusion amount of the plurality of protrusions.   The pushbutton switch according to any one of claims 5 to 7, wherein the notch is formed so as to enter an inner peripheral side of a virtual circle connecting the apexes of the three protrusions. An operation member that receives a pressing operation, a movable contact body that is driven in response to a pressing operation on the operation member, a storage that can store the operation member and the movable contact body, and a fixed contact that is electrically connected to the movable contact body A pushbutton switch that allows the operation member to slide along the side wall surface of the case in response to a pressing operation,
A pushbutton switch characterized in that a distance on a lower end side with respect to the side wall surface in a sliding contact portion of the operation member that is in sliding contact with a side wall surface of the case is shorter than a distance on an upper end side.   An inclined surface inclined inward from the upper end portion to the lower end portion of the operation member is provided in the sliding contact portion, and the lower end portion of the sliding contact portion is outside the virtual line along the inclination angle of the inclined surface. The push button switch according to claim 9, wherein an inclined surface is provided on the side wall surface of the case along the inclination of the inclined surface of the sliding contact portion.   The sliding contact portion is provided with a leg portion extending downward from the inclined surface of the sliding contact portion, and the inclined surface of the sliding contact portion is extended to a lower side than the base portion of the leg portion. The push button switch according to claim 10.   12. The pushbutton switch according to claim 11, wherein a lower side portion of the inclined surface of the sliding contact portion in the leg portion of the sliding contact portion has a linear shape.   The pushbutton switch according to any one of claims 9 to 12, wherein a lower end portion of the sliding contact portion is arranged at a position outside the upper end portion.

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