JP2014220039A - Push switch - Google Patents

Abstract

Provided is a push switch in which a movable member is not damaged. A push switch includes a substrate, a fixed sheet that forms a recess on the surface of the substrate, a first fixed contact disposed in the recess on the surface of the substrate, and a recess on the surface of the substrate. The second fixed contact 14 arranged around the first fixed contact and the convex dome shape, and the end is accommodated in the recess on the surface of the substrate so as to be in contact with the second fixed contact and pressed. The first movable member 201 whose central portion is in contact with the first fixed contact, the second movable member 202 having a convex dome shape and disposed on the upper portion of the first movable member, and the convex A third movable member 203 having a dome shape and disposed between the first and second movable members, and a protective sheet 30 covering the recess from above the first, second and third movable members. The spring load of the third movable member is smaller than the spring load of the first and second movable members. Characterized in that it is Ku set. [Selection] Figure 4

Description

  The present invention relates to a push switch.

  Push switches are known as button switches used for mobile communication devices such as mobile phones, portable and vehicle-mounted audio devices, digital camera VTRs, and the like.

  FIG. 1A shows a cross-sectional view of a push switch described in Patent Document 1. FIG.

  The push switch 100 includes a substrate 101, a movable member 102, a first pressing member 103, a second pressing member 104, a housing 105, a first fixed contact 106, and a second fixed contact 107.

  A concave portion is formed on the surface of the substrate 101, a first fixed contact 106 is arranged at the center of the concave portion, and a second fixed contact 107 is arranged around the concave portion. The movable member 102 is a flexible conductive member having a dome-like shape, and is arranged so that an end thereof is in contact with the second fixed contact 107. The first pressing member 103 is a resin sheet material having a shape obtained by joining two disks having different diameters. The second pressing member 104 is a member having a hemispherical shape and is made of synthetic resin. The bottom surface of the second pressing member 104 is adhered to the back surface of the first pressing member 103, and the vertex of the spherical surface of the second pressing member 104 is in contact with the vertex of the movable member 102. The housing 105 is bonded to the upper portion of the substrate 101, and forms a space for accommodating the movable member 102, the lower portion of the first pressing member 103, and the second pressing member 104 together with the concave portion of the substrate 101.

  When the surface of the first pressing member 103 is pressed, the curve of the movable member 102 is reversed, and the central portion including the apex of the movable member 102 contacts the first fixed contact 106. When the vertex of the movable member 102 contacts the first fixed contact 106, the first fixed contact 106 and the second fixed contact 107 are electrically connected via the movable member 102.

  When the surface of the first pressing member 103 is pressed, the movable member 102 functions as a spring that generates a spring load that acts in a direction opposite to the force pressing the surface of the first pressing member 103. When the surface of the first pressing member 103 is pressed, the spring load of the movable member 102 acting in the direction opposite to the pressing direction causes a click feeling.

  As devices equipped with push switches become smaller, push switches are becoming smaller. As the push switch is downsized, the push switch is not pressed directly, but is pressed through a pressing member also called a pusher. In the structure in which the push switch is pressed through the pusher, there is a possibility that a deviation may occur between the pusher assembly position and the push switch pressing member assembly position. If a deviation occurs between the pusher assembly position and the push switch push-in member assembly position, a sufficient click feeling may not be obtained. Japanese Patent Application Laid-Open Publication No. 2004-228561 describes a push switch that can obtain a sufficient click feeling even when a shift occurs between the pusher assembly position and the push switch assembly position.

  FIG. 1B is a cross-sectional view of the push switch described in Patent Document 2.

  The push switch 110 includes a substrate 111, a movable member 112, a first pressing member 113, a second pressing member 114, a fixed sheet 115, a first fixed contact 116, a second fixed contact 117, and a holding sheet 118. And have.

  The fixed sheet 115 is a sheet material in which a void having a square cross section when viewed from above is formed, and is formed of a synthetic resin. A first fixed contact 116 is disposed at the center of the recess formed by the gap portion of the fixed sheet 115, and a second fixed contact 117 is disposed around the recess. The movable member 112 is a flexible conductive member having a dome-like shape, and is arranged so that an end thereof is in contact with the second fixed contact 117. The first pressing member 113 is a resin sheet material having a disk shape. The second pressing member 114 is a member having a disk shape whose diameter is smaller than that of the first pressing member 113, and is formed of a synthetic resin having higher hardness than the first pressing member 113. The holding sheet 118 is formed of an insulating resin film.

  The fixed sheet 115 is bonded to the surface of the substrate 111 to form a space for accommodating the movable member 112 and the second pressing member 114 together with the concave portion of the substrate 101. The back surface of the first pressing member 113 is bonded to the center of the front surface of the holding sheet 118 with an adhesive 119. The surface of the second pressing member 114 is bonded to the center of the back surface of the holding sheet 118 with an adhesive 119. The back surface of the second pressing member 114 is in contact with the apex of the movable member 102. The outer edge of the holding sheet 118 is bonded to the surface of the fixed sheet 115. The holding sheet 118 functions as a waterproof sheet material that seals the space for housing the movable member 112 and the second pressing member 114 and waterproofs the space by bonding the outer edge to the upper surface of the fixed sheet 115.

  When the surface of the first pressing member 113 is pressed through a pusher (not shown), the curvature of the movable member 112 is reversed, and the central portion including the apex of the movable member 112 contacts the first fixed contact 116. When the vertex of the movable member 112 contacts the first fixed contact 116, the first fixed contact 116 and the second fixed contact 117 are electrically connected via the movable member 112.

  The push switch 110 includes a first pressing member 113 disposed on the surface of the holding sheet 118 and immediately above the vertex of the movable member 112, and a second pressing member formed on the back surface of the holding sheet 118 and immediately above the vertex of the movable member 112. 114. When the first pusher member 113 is pushed by the pusher, the second pusher member 114 always pushes the apex of the movable member 112, that is, the central portion, and elastically reverses it. For this reason, in the push switch 110, even when a shift occurs between the pusher mounting position and the push switch 110 mounting position, a sufficient click feeling can be obtained and the operating life can be improved. .

  Since the size of the push switch 110 is smaller than that of the push switch 100, the size of the movable member 112 is also reduced. Since the size of the movable member 112 is becoming smaller, the spring load that can be realized by the size of the movable member 112 is also becoming smaller, and the spring load that can provide a sufficient click feeling is obtained from a single movable member. Realizing at 112 is not easy.

  Patent Document 3 describes a push switch in which two movable members having the same shape are arranged in an overlapping manner. In the push switch described in Patent Literature 3, two movable members having the same shape are arranged so as to overlap each other, so that a spring load during operation can be increased and a sufficient click feeling can be obtained.

JP 2004-79220 A JP 2011-100549 A JP 2011-258379 A

  As push switches are further reduced in size, the number of movable members that are arranged in an overlapping manner has become three or more in order to realize a spring load for the push switch to obtain a sufficient click feeling. .

  When the number of movable members arranged in an overlapping manner is three or more, there is a problem that the movable member arranged in the middle is damaged. Specifically, when the number of movable members arranged in a superimposed manner is three, before reaching the desired number of endurances, the movable member arranged between the upper and lower movable members is reached. The movable member arrange | positioned in this occurred. If the movable member is damaged, the spring load of the push switch is reduced, and the damaged movable member may be scattered in the space for storing the movable member.

  The present invention aims to solve this problem.

  Specifically, the present invention provides a push switch having three or more movable members arranged in an overlapping manner so that the movable member is not damaged until a desired number of durability times is reached. With the goal.

  In order to achieve the above object, a push switch according to the present invention includes a substrate, a fixed sheet for forming a recess in the surface of the substrate, a first fixed contact disposed in the recess in the surface of the substrate, and the surface of the substrate. The second fixed contact disposed around the first fixed contact and the convex dome shape are housed in the recess on the surface of the substrate so that the end is in contact with the second fixed contact. A first movable member whose central portion contacts the first fixed contact when depressed, a second movable member having a convex dome shape and disposed on an upper portion of the first movable member, and a convex shape A dome shape, a third movable member disposed between the first and second movable members, and a protective sheet covering the recess from above the first, second and third movable members, The spring load of the third movable member is set smaller than the spring load of the first and second movable members. And wherein the Rukoto.

  Furthermore, in the push switch according to the present invention, the difference between the spring load of the first movable member and the spring load of the third movable member, and the difference between the spring load of the second movable member and the spring load of the third movable member are , Preferably greater than 0.05N.

  Furthermore, in the push switch according to the present invention, the difference between the spring load of the first movable member and the spring load of the third movable member, and the difference between the spring load of the second movable member and the spring load of the third movable member are , Greater than 0.07N.

  Furthermore, it is preferable that the push switch according to the present invention further includes a pressing member that presses the surface of the second movable member on the second movable member side of the protective sheet.

  Furthermore, it is preferable that the push switch according to the present invention further includes another pressing member for pressing the pressing member on the surface of the protective sheet.

  According to the push switch according to the present invention, the spring load of the third movable member disposed in the middle is set smaller than the spring loads of the first and second movable members disposed above and below, It has become possible to provide a push switch in which the movable member is not damaged until the desired number of durability times is reached.

(A) shows sectional drawing of an example of the conventional push switch, (b) shows sectional drawing of the other example of the conventional push switch. It is a perspective view of an example of a push switch. (A) is a top view of the push switch shown in FIG. 2, (b) is a bottom view of the push switch shown in FIG. It is sectional drawing which follows the AA 'line of the push switch shown in FIG. FIG. 3 is an exploded perspective view of the push switch shown in FIG. 2. It is a figure which shows the relationship between the difference of a spring load, and a lifetime. It is sectional drawing of the other example of a push switch. It is sectional drawing of the further another example of a push switch.

  Hereinafter, a push switch according to the present invention will be described with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to these embodiments, and extends to equivalents to the invention described in the claims.

  FIG. 2 is a perspective view of an example of a push switch. 3A is a plan view of the push switch shown in FIG. 2, and FIG. 3B is a bottom view of the push switch shown in FIG. 4 is a cross-sectional view of the push switch shown in FIG. 2 along the line AA ′. FIG. 5 is an exploded perspective view of the push switch shown in FIG. FIG. 5 is an exploded perspective view of the push switch shown in FIG.

  The push switch 1 includes a substrate 10, a fixed sheet 16, a movable member 20, a protective sheet 30, a first pressing member 40, and a second pressing member 42.

  A first fixed contact 12 and a second fixed contact 14 are formed on the surface of the substrate 10. In addition, a fixing sheet 16 on which a hollow portion having a square cross section is formed is bonded to the surface of the substrate 10. The first fixed contact 12 is a conductor having a square plane, and is disposed at the center of the surface of the substrate 10. The second fixed contact 14 is a conductor having a frame-like plane, and is disposed on the surface of the substrate 10 along the inner peripheral wall of the fixed sheet 16 so as to surround the first fixed contact 12.

  A pair of first electrodes 13 a and 13 b and a pair of second electrodes 15 a and 15 b are formed on the back surface of the substrate 10. In addition, an insulating sheet 18 formed of an insulating synthetic resin is disposed on the back surface of the substrate 10. The pair of first electrodes 13a and 13b are electrically connected to the first fixed contact 12 via a through electrode and a back surface wiring (not shown), respectively. The pair of second electrodes 15a and 15b are electrically connected to the second fixed contact 14 via a through electrode and a back surface wiring (not shown), respectively.

  The fixed sheet 16 is bonded to the surface of the substrate 10, and forms a space for accommodating the movable member 20, the first pressing member 40, and the second pressing member 42 together with the substrate 10.

  The movable member 20 is a flexible conductive member having a dome shape, and is arranged so that the end portion is in contact with the second fixed contact 14.

  The protective sheet 30 is a flexible insulating resin sheet, and the end of the back surface is bonded to the upper surface of the fixed sheet 16. When the end portion of the protective sheet 30 is bonded to the upper surface of the fixed sheet 16, the protective sheet 30 houses the movable member 20, the first pressing member 40, and the second pressing member 42 together with the substrate 10 and the fixed sheet 16. Seal the space.

  The first pressing member 40 is a resin sheet material having a disk shape. For example, the material of the first pressing member 40 is a polyimide resin. The first pressing member 40 functions to transmit the pressed force to the second pressing member 42 when a pusher (not shown) is pressed.

  The second pressing member 42 is a synthetic resin member having a disk shape. The material of the second pressing member 42 is, for example, an epoxy resin, but a material having a higher hardness than the material of the first pressing member 40 is selected. The area of the surface of the second pressing member 42 is smaller than the area of the plane of the first pressing member 40. The second pressing member 42 is disposed such that the back surface of the second pressing member 42 is in contact with the apex of the movable member 20. Since the rear surface of the second pressing member 42 is disposed so as to contact the apex of the movable member 20, when the second pressing member 42 presses the movable member 20, the force is concentrated on the apex of the movable member 20 to move the movable member 20. 20 can be pressed.

  The first pressing member 40 is bonded to the center of the surface of the protective sheet 30 with the adhesive 60, and the second pressing member 42 is bonded to the center of the surface of the protective sheet 30 with the adhesive 62.

  When the surface of the first pressing member 40 is pressed through a pusher (not shown), the apex of the partial sphere of the second pressing member 42 presses the movable member 20, and the curvature of the movable member 20 is reversed to move. A central portion including the apex of the member 20 contacts the first fixed contact 12. When the apex of the movable member 20 contacts the first fixed contact 12, the first fixed contact 12 and the second fixed contact 14 are electrically connected via the movable member 20.

  The movable member 20 includes a first movable member 201, a second movable member 202 positioned above the first movable member 201, and a third movable member disposed between the first movable member 201 and the second movable member 202. 203. The end of the first movable member 201 is in contact with the second fixed contact 14. Further, the first movable member 201 comes into contact with the first fixed contact 12 at the center when the movable member 20 is pressed by the second pressing member 42. The first movable member 201, the second movable member 202, and the third movable member 203 are not joined to each other and are individually disposed in a space formed by the substrate 10 and the fixed sheet 16.

  The first movable member 201, the second movable member 202, and the third movable member 203 have substantially the same shape and are formed of the same material. Further, the spring load of the first movable member 201 and the spring load of the second movable member 202 are equal. However, the spring load of the third movable member 203 is set smaller than the spring loads of the first movable member 201 and the second movable member 202. By setting the spring load of the third movable member 203 to be smaller than the spring loads of the first movable member 201 and the second movable member 202, the third movable member 203 may be damaged before reaching the desired number of durability times. Becomes smaller.

  When the surface of the first pressing member 40 is pressed and the push switch is pressed, the second pressing member 42 is applied with a force in the vertical direction from the dome-shaped apex of the second movable member 202, whereby the second movable member 202. Press. The second movable member 202 pressed by the second pressing member 42 presses the third movable member 203 by applying a force in various directions from the surface in contact with the third movable member 203. At this time, the force for pressing the third movable member 203 also acts on the second movable member 202. The third movable member 203 pressed by the second movable member 202 presses the first movable member 201 by applying a force in various directions from the surface in contact with the first movable member 201. At this time, the force for pressing the first movable member 201 also acts on the third movable member 203.

  The third movable member 203 is applied with force from various directions through the surfaces that are in contact with each other from the first movable member 201 and the second movable member 202 that are positioned up and down for each pressing operation. Since the third movable member 203 receives forces from various directions from both the first movable member 201 and the second movable member 202, a stress is generated in various directions from the front surface and the back surface at every pressing operation. On the other hand, the second pressing member 42 that presses the second movable member 202 is pressed at the apex of the partial sphere, and the first movable member 201 has no further pressing member. Since the first movable member 201 and the second movable member 202 are only subjected to a force from the third movable member 203 for each pressing operation, the direction of the generated stress is less than that of the third movable member 203. Since the third movable member 203 receives stress from various directions as compared with the first movable member 201 and the second movable member 202 every time the pressing operation is performed, the third movable member 203 is more easily damaged than the first movable member 201 and the second movable member 202.

  Further, the first movable member 201, the second movable member 202, and the third movable member 203 are not joined to each other and are individually disposed in a space formed by the substrate 10 and the fixed sheet 16. Since the 1st movable member 201, the 2nd movable member 202, and the 3rd movable member 203 are each arrange | positioned separately, there exists a possibility that a mutual positional relationship may shift | deviate. When the positional relationship between the first movable member 201, the second movable member 202, and the third movable member 203 deviates, the third movable member 203 applies stress from various directions from the first movable member 201 and the second movable member 202. The chance of receiving is high.

  By setting the spring load of the third movable member 203 to be smaller than the spring loads of the first movable member 201 and the second movable member 202, the magnitude of the stress generated in the third movable member 203 for each pressing operation is reduced. Can do. By making the magnitude of the stress generated in the third movable member 203 for each pressing operation smaller than the magnitude of the stress generated in the first movable member 201 and the second movable member 202, the third movable is arranged at a position where it is easily damaged. The life of the member 203 is extended.

  FIG. 6 is a diagram showing the relationship between the difference between the spring load of the first movable member 201 and the second movable member 202 and the spring load of the third movable member 203 and the life of the push switch 1. In FIG. 6, the spring loads of the first movable member 201 and the second movable member 202 are equal, and when the horizontal axis is a positive value, the spring loads of the third movable member 203 are the first movable member 201 and the second movable member 202. It is set smaller than the spring load. The spring loads of the first movable member 201 and the second movable member 202 are kept constant at 0.6 N as measured by a pressing load of 5 N and a pressing speed of 13.5 mm / min. The horizontal axis in FIG. 6 indicates the difference between the spring load of the first movable member 201 and the second movable member 202 and the spring load of the third movable member 203. The vertical axis in FIG. 6 indicates the number of times the push switch 1 is pressed until it is damaged as the life of the push switch 1.

  The spring load of the third movable member 203 is set to be 0.10 N larger than the spring load of the first movable member 201 and the spring load of the third movable member 203 is set to be 0.10 N larger than the spring load of the second movable member 202. The lifespan when it is done is approximately 250,000 times. The life when the spring load of the third movable member 203 is set equal to the spring load of the first movable member 201 and the spring load of the third movable member 203 is set equal to the spring load of the second movable member 202 is approximately 300,000 times.

  The spring load of the third movable member 203 is set 0.05 N smaller than the spring load of the first movable member 201 and the spring load of the third movable member 203 is set 0.05 N smaller than the spring load of the second movable member 202. The lifespan when it is done is approximately 500,000 times. Further, the spring load of the third movable member 203 is set to be 0.07N smaller than the spring load of the first movable member 201, and the spring load of the third movable member 203 is 0.07N smaller than the spring load of the second movable member 202. The service life when set to a small value is approximately 1 million times. Further, the spring load of the third movable member 203 is set to be 0.10 N smaller than the spring load of the first movable member 201, and the spring load of the third movable member 203 is 0.10 N than the spring load of the second movable member 202. The service life when set to a small value is approximately 2 million times.

  When the difference between the spring load of the first movable member 201 and the spring load of the third movable member 203 and the difference between the spring load of the second movable member 202 and the spring load of the third movable member 203 are less than 0.05N, The life of the push switch 1 has hardly changed. However, the difference between the spring load of the first movable member 201 and the spring load of the third movable member 203 and the difference between the spring load of the second movable member 202 and the spring load of the third movable member 203 are more than 0.05N. If it becomes larger, the life of the push switch 1 becomes longer. When the difference between the spring load of the first movable member 201 and the spring load of the third movable member 203 and the difference between the spring load of the second movable member 202 and the spring load of the third movable member 203 are 0.07N. The service life is doubled when the spring load difference is 0.05N. Further, the difference between the spring load of the first movable member 201 and the spring load of the third movable member 203 and the difference between the spring load of the second movable member 202 and the spring load of the third movable member 203 are 0.10 N. The service life is four times that when the spring load difference is 0.05N. Accordingly, the difference between the spring load of the first movable member 201 and the spring load of the third movable member 203 and the difference between the spring load of the second movable member 202 and the spring load of the third movable member 203 are from 0.05N. Is preferably larger and smaller than 0.10N. Further, the difference between the spring load of the first movable member 201 and the spring load of the third movable member 203 and the difference between the spring load of the second movable member 202 and the spring load of the third movable member 203 are from 0.07N. More preferably, it is larger and smaller than 0.10N.

  FIG. 7 is a cross-sectional view of another example of the push switch.

  The push switch 2 is different from the push switch 1 in that a movable member 21 is disposed instead of the movable member 20.

  The movable member 21 includes a first movable member 211, a second movable member 212 positioned above the first movable member 211, and a third movable member disposed between the first movable member 211 and the second movable member 212. 213. The movable member 21 further includes a fourth movable member 214 disposed between the second movable member 212 and the third movable member 213. The end of the first movable member 211 is in contact with the second fixed contact 14. Further, when the movable member 21 is pressed by the second pressing member 42, the center portion of the first movable member 211 contacts the first fixed contact 12. The first movable member 211, the second movable member 212, the third movable member 213, and the fourth movable member 214 are not joined to each other and are individually disposed in a space formed by the substrate 10 and the fixed sheet 16.

  The first movable member 211, the second movable member 212, the third movable member 213, and the fourth movable member 214 have substantially the same shape and are formed of the same material. Further, the spring load of the first movable member 211 and the spring load of the second movable member 212 are equal. Further, the spring load of the third movable member 213 and the spring load of the fourth movable member 214 are equal and set to be smaller than the spring loads of the first movable member 211 and the second movable member 212. The spring loads of the third movable member 213 and the fourth movable member 214 arranged in the middle are set to be smaller than the spring loads of the first movable member 211 and the second movable member 212 arranged at the upper end and the lower end. The movable member to be arranged is prevented from being damaged.

  FIG. 8 is a cross-sectional view of still another example of the push switch.

  The push switch 3 is different from the push switch 1 in that a movable member 22 is disposed instead of the movable member 20.

  The movable member 22 includes a first movable member 221, a second movable member 222 positioned above the first movable member 221, and a third movable member disposed between the first movable member 221 and the second movable member 222. 223. The movable member 22 further includes a fourth movable member 224 that is disposed between the first movable member 221 and the third movable member 223. The movable member 22 further includes a fifth movable member 225 disposed between the second movable member 222 and the third movable member 223. The end of the first movable member 221 is in contact with the second fixed contact 14. The first movable member 221 comes into contact with the first fixed contact 12 at the center when the movable member 22 is pressed by the second pressing member 42. The first movable member 221, the second movable member 222, the third movable member 223, the fourth movable member 224, and the fifth movable member 225 are not joined to each other, but individually in the space formed by the substrate 10 and the fixed sheet 16. Be placed.

  The first movable member 221, the second movable member 222, the third movable member 223, the fourth movable member 224, and the fifth movable member 225 have substantially the same shape and are formed of the same material. Further, the spring load of the first movable member 221 and the spring load of the second movable member 222 are equal. Further, the spring load of the third movable member 223, the spring load of the fourth movable member 224, and the spring load of the fifth movable member 225 are equal and smaller than the spring loads of the first movable member 221 and the second movable member 222. The spring loads of the third movable member 223, the fourth movable member 224, and the fifth movable member 225 disposed in the middle are made smaller than the spring loads of the first movable member 221 and the second movable member 222, and are disposed in the middle. To prevent the movable member from being damaged.

  In the push switches 1 to 3, the spring load of the movable member arranged in the middle is made smaller than the spring load of the movable member arranged in the upper end and the lower end, thereby preventing damage to the movable member arranged in the middle. Increase life.

  In the push switches 1 to 3, the first pressing member 40 is a resin sheet material having a disk shape formed of polyimide resin. However, the first pressing member 40 is a member that functions to transmit the pressed force to the second pressing member 42 when a pusher (not shown) is pressed, and a member that directly presses the movable member 20. is not. Therefore, the first pressing member 40 only needs to have a shape having a surface larger than the surface of the second pressing member 42 so as to transmit the pressing force to the second pressing member 42. The material characteristics such as the shape of the member 40 and the hardness of the material are appropriately determined.

  Further, in the push switches 1 to 3, the second pressing member 42 has a disk shape. However, the second pressing member cuts out a partial sphere, a hemisphere, a triangular prism, a quadrangular prism, or a part of an ellipsoid. You may make it the shape which can concentrate the force of vertices, such as another shape. By making the second pressing member into a shape that can concentrate the force at the apex, the second pressing member can press the movable member 20 while concentrating the force at the apex. It is not preferable that the second pressing member 42 bend excessively when the movable member 20 is pressed. The second pressing member 42 is 80 to 90 when measured with a durometer hardness meter type D (JIS K 6253). It is formed of a material having hardness.

  In the push switches 1 to 3, the spring loads of the movable members arranged at the upper end and the lower end are equal, but the spring loads of the movable members arranged at the upper end and the lower end may be different. However, even when the spring loads of the movable members arranged at the upper end and the lower end are different, the spring loads of the movable members arranged at the upper end and the lower end are set larger than the spring loads of the movable member arranged in the middle. .

  In the push switch 3, the spring loads of the third movable member 223, the fourth movable member 224, and the fifth movable member 225 disposed in the middle are all greater than the spring loads of the first movable member 221 and the second movable member 222. It is set small. However, only the third movable member 223 may be set so that the spring load is smaller than that of the first movable member 221, the second movable member 222, the fourth movable member 224, and the fifth movable member 225. Alternatively, the fourth movable member 224 and the fifth movable member 225 may be set so that the spring load is smaller than that of the first movable member 221, the second movable member 222, and the third movable member 223.

1, 2, 3 Push switch 10 Substrate 12 First fixed contact 14 Second fixed contact 16 Fixed sheet 20, 21, 22 Movable member 201, 211, 221 First movable member 202, 212, 222 Second movable member 203, 213 223 Third movable member 214, 224 Fourth movable member 225 Fifth movable member 30 Protective sheet 40 First pressing member (other pressing member)
42 Second pressing member (pressing member)

Claims (5)

A substrate,
A fixing sheet that forms a recess in the surface of the substrate;
A first fixed contact disposed in the recess of the surface of the substrate;
A second fixed contact disposed around the first fixed contact in the recess of the surface of the substrate;
It has a convex dome shape, and is housed in the concave portion of the surface of the substrate so that the end portion is in contact with the second fixed contact, and when pressed, the central portion comes into contact with the first fixed contact. A first movable member;
A second movable member having a convex dome shape and disposed on top of the first movable member;
A third movable member having a convex dome shape and disposed between the first and second movable members;
A protective sheet covering the recess from above the first, second and third movable members,
The spring load of the third movable member is set smaller than the spring load of the first and second movable members.
Push switch characterized by that.   The difference between the spring load of the first movable member and the spring load of the third movable member, and the difference between the spring load of the second movable member and the spring load of the third movable member are more than 0.05N. The push switch of claim 1, wherein the push switch is large.   The difference between the spring load of the first movable member and the spring load of the third movable member, and the difference between the spring load of the second movable member and the spring load of the third movable member are more than 0.07N. The push switch of claim 1, wherein the push switch is large.   The push switch according to any one of claims 1 to 3, further comprising a pressing member that presses a surface of the second movable member on the second movable member side of the protective sheet.   The push switch according to claim 4, further comprising another pressing member that presses the pressing member on a surface of the protective sheet.

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