JP2019185864A - Push switch - Google Patents

Abstract

To provide a push switch that is easily manufactured and has excellent quietness.SOLUTION: A push switch includes: a base plate (10); a first fixing contact point (11) disposed on the base plate (10); second fixing contact points (12, 22, and 32) disposed on the base plate (10) and around the first fixing contact point (11); flat-plate-shaped first moveable springs (13, 33, and 33') which are electrically connected to the second fixing contact points (12, 22, and 32) and do not perform inversion action when being brought into contact with the first fixing contact point (11); a second movable spring (14) which is disposed above the first movable springs (13, 33, and 33") and has a doom portion (141) capable of performing inversion action; a pressing portion (15) for pressing the doom portion (141); and a protection sheet (17) which protects the first and second fixing contact portions from the upper side of the pressing portion (15). After the pressing portion (15) is pushed down and the doom portion (141) is inverted, the first movable springs (13, 33, and 33') are pushed down, thereby bringing the first movable springs (13, 33, and 33") into contact with the first fixing contact portion (10).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a push switch.

  Push switches are known as button switches used for mobile communication devices such as smartphones, portable and vehicle-mounted audio devices, digital camera VTRs, and the like. Conventionally, it has often been notified to the operator of a device that a setting has been changed by pressing a push switch by a click sound when the button is pressed or a feeling of clicking on a finger to be operated. Patent Document 1 discloses a push switch using a convex movable member in order to make a load characteristic that gives a click feeling of the push switch uniform.

  However, the click sound generated by the push switch may cause discomfort to third parties other than the operator of the device. Further, it is preferable to notify the operator that the function has been changed via a push switch by an electronic sound or vibration of an actuator. Therefore, it is required to suppress the click sound generated when the push switch is pressed. Patent Document 2 discloses a first metal member having a convex curved shape that is inverted when pressed, a second metal member having a convex curved shape, and first and second metal members. A push switch excellent in quietness having a buffer member disposed therebetween is disclosed. However, the push switch disclosed in Patent Document 2 is not easy to manufacture because the first and second metal members and the buffer member need to be aligned.

Japanese Patent Laid-Open No. 2006-081915 Japanese Unexamined Patent Publication No. 2017-079133

  An object of the present invention is to provide a push switch that is easy to manufacture and excellent in quietness.

  A push switch according to the present invention includes a substrate, a first fixed contact disposed on the substrate, a second fixed contact disposed on the substrate and around the first fixed contact, and a second fixed contact. A flat plate-shaped first movable spring that is electrically connected and does not perform a reversing operation when contacting the first fixed contact, and a first dome portion that is disposed above the first movable spring and that can be reversed. 2 It has a movable spring, a pressing part for pressing the dome part, and a protective sheet for protecting the first and second fixed contacts from above the pressing part, and the dome part is inverted when the pressing part is pressed down. Later, when the first movable spring is pressed, the first movable spring comes into contact with the first fixed contact.

  The second fixed contact is formed with a pair of recesses facing each other via the first fixed contact, one end of the first movable spring is housed in one of the pair of recesses, and the other end of the first movable spring is a pair of recesses It is preferable that the other is stored.

  It is preferable to further have a drop-off prevention sheet disposed between the first movable spring and the second movable spring.

  The first movable spring includes a flat plate portion that contacts the first fixed contact, a first contact portion that is provided at one end of the flat plate portion and contacts the second fixed contact, and a second contact that is provided at the other end of the flat plate portion. It is preferable to have the 2nd contact part which contacts a fixed contact.

  The push switch of the present invention is easy to manufacture and can suppress the generation of sound accompanying operation.

It is a figure explaining the outline | summary of the example of a structure of a push switch, (a) is a disassembled perspective view of a push switch, (b) is sectional drawing in the AA 'line shown to (a). It is a figure which shows operation | movement of a push switch, (a) shows a 1st operation state, (b) shows a 2nd operation state, (c) shows a 3rd operation state. It is a figure which shows the example of the relationship between the moving distance of a 2nd movable spring, and the repulsive force with respect to pressing force. It is a figure which shows an example of the manufacturing method of a push switch, (a) shows a 1st process, (b) shows a 2nd process, (c) shows a 3rd process, (d) shows a 4th process. (E) shows the fifth step. It is a disassembled perspective view of a push switch. It is sectional drawing in the AA 'line of FIG. It is a figure which shows the example of a push switch, (a) is a side view of an example of the 1st movable spring used for a push switch, (b) is sectional drawing of a push switch, (c) is a push switch. It is a side view of the other example of the 1st movable spring to be used. It is a figure which shows the modification of the shape and arrangement | positioning of a board | substrate, a 1st fixed contact, and a 2nd fixed contact, (a) is a figure which shows a 1st modification, (b) is a figure which shows a 2nd modification. (C) is a diagram showing a third modification. It is sectional drawing of the push switch for showing the modification of a 2nd movable spring, (a) shows 1st Embodiment, (b) shows a 1st modification, (c) shows a 2nd modification. . It is a figure which shows the example of the relationship between the moving distance of a 2nd movable spring, and the repulsive force with respect to pressing force, (a) shows 1st Embodiment, (b) shows a 1st modification, (c) is A 2nd modification is shown.

  Hereinafter, a push switch according to one aspect of the present disclosure will be described with reference to the drawings. However, it should be noted that the technical scope of the present disclosure is not limited to the embodiments, and extends to the invention described in the claims and equivalents thereof. In the following description and drawings, components having the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

(Outline of the configuration of the push switch in the first embodiment)
FIG. 1 is a diagram illustrating an outline of a configuration of a push switch according to the first embodiment. FIG. 1A is an exploded perspective view of the push switch. FIG.1 (b) is sectional drawing in the AA 'line shown to Fig.1 (a).

  The push switch 1 includes a substrate 10, a first fixed contact 11, a second fixed contact 12, a first movable spring 13, a second movable spring 14, a pressing portion 15, a housing member 16, and a protective sheet 17.

  The substrate 10 is a member on a flat plate formed of, for example, an insulating resin material, and has a rectangular surface. A first fixed contact 11 is disposed on the substrate 10. The first fixed contact 11 is, for example, a cylindrical conductor having a contact surface 111 that comes into contact with the first movable spring 13, and is arranged at the center of the upper surface of the substrate 10. A second fixed contact 12 is disposed around the first fixed contact. The second fixed contact 12 is a rectangular frame-shaped conductor having an arrangement surface 121 on which the first movable spring 13 is arranged. The first and second fixed contacts are formed of a conductive member such as a conductive plastic and are disposed on the surface of the substrate 10. The first fixed contact 11 and the second fixed contact 12 may be formed by etching a metal foil.

  The height of the placement surface 121 where the first movable spring 13 is disposed in the second fixed contact 12 from the substrate 10 is the height of the contact surface 111 in contact with the first movable spring 13 in the first fixed contact 11 from the substrate 10. Higher than that.

  By forming the second fixed contact 12 so as to surround the first fixed contact 11, the contact area between the substrate 10 and the second fixed contact 12 can be increased. When the push switch 1 is pressed, a horizontal force is applied to the second fixed contact 12 by the sinking or restoring operation of the first movable spring 13. By increasing the contact area, it is possible to prevent the second fixed contact 12 from peeling from the substrate 10.

  A first electrode (not shown) connected to the first fixed contact 11 and a second electrode (not shown) connected to the second fixed contact are formed on the back surface of the substrate 10. The push switch 1 is connected to an external device through a first electrode and a second electrode (not shown).

  The first movable spring 13 is a flat spring that does not perform a reversal operation, is bridged above the first fixed contact 11, and contacts the first fixed contact 11. The first movable spring 13 is arranged on the arrangement surface 121 of the second fixed contact 12 and is electrically connected to the second fixed contact 12. The first movable spring 13 is constituted by a conductive spring member such as stainless steel. Since the height of the arrangement surface 121 of the second fixed contact 12 from the substrate is higher than the height of the contact surface 111 of the first fixed contact 11 from the substrate, when the push switch 1 is not pressed, the first The movable spring 13 does not contact the first fixed contact 11. Therefore, when the push switch 1 is not depressed, the first fixed contact 11 and the second fixed contact 12 are not conducted.

  When the push switch 1 is pressed, the first movable spring 13 is pushed down in the direction of the substrate 10 and contacts the first fixed contact 11 before performing the reversing operation.

  Further, a second movable spring 14 having a dome portion 141 at the center is disposed above the first movable spring 13. The second movable spring 14 is a member having elasticity that can be bent in response to pressing by the operator, and is made of, for example, stainless steel. Further, the second movable spring 14 may be a spring made of a conductive resin material. The center of the second movable spring 14 is disposed so as to be located immediately above the first fixed contact 11. When the pressing portion 171 located immediately above the second movable spring 14 is pressed by the operator, the second movable spring 14 generates a drag force against the pressing and the dome portion 141 is reversed. The inverted dome portion 141 pushes down the first movable spring 13, thereby pushing down the first movable spring 13 in the direction of the first fixed contact 11. When the pressed first movable spring 13 and the first fixed contact 11 come into contact with each other, the first fixed contact 11 and the second fixed contact 12 are electrically connected via the first movable spring 13. The second movable spring 14 is composed of a single leaf spring having a dome portion 141.

  The pressing portion 15 is formed of a resin material and is disposed on the second movable spring 14. The pressing portion 15 increases the height of the protective sheet 17 from the substrate 10 and improves the operability of the push switch 1 pressing operation. The pressing portion 15 has a cylindrical shape, and a lower bottom surface swells in the direction of the substrate 10.

  The accommodating member 16 forms an accommodating portion for accommodating the first fixed contact 11, the second fixed contact 12, the first movable spring 13, and the second movable spring 14, and is disposed on the substrate 10. The accommodating member 16 is a rectangular frame-shaped member made of a resin material in accordance with the size of the substrate 10, and is adhered to the upper surface of the substrate 10 through an adhesive and an adhesive sheet adhesive member. The housing member 16 may be integrally formed with the substrate 10, for example, may be integrally formed with the substrate 10 by an insert mold.

  The protective sheet 17 is attached on the pressing portion 15. The protective sheet 17 is formed of, for example, a polyimide sheet. The protective sheet 17 has a pressing part 171 higher than the height of the housing member 16 pushed up by the pressing part 15 and a peripheral part 172 surrounding the pressing part 171. The peripheral portion 172 is attached to the upper surface of the housing member 16 with, for example, an adhesive. The affixing may be thermocompression bonding.

  FIG. 2 is a diagram illustrating the operation of the push switch 1. 2A shows the first operation state, FIG. 2B shows the second operation state after the first operation state, and FIG. 2C shows the third operation state after the second operation state. Indicates.

  First, in the first operation state, when a pressing force F is applied in the direction of the substrate 10 from the pressing unit 171 in response to the operator pressing the pressing unit 171, the second movable spring 14 moves toward the substrate. A repulsive force f1 corresponding to the displacement, that is, the moving distance of the second movable spring 14 is generated. As the moving distance of the second movable spring 14 increases, the repulsive force f1 increases. Further, when the moving distance of the second movable spring 14 increases, the dome portion starts to reverse in the direction of the substrate 10 and the repulsive force f1 starts to decrease. This is a so-called inversion operation. When the first movable spring 13 is not provided, the second movable spring 14 rapidly decreases the repulsive force f1 as the moving distance of the second movable spring 14 increases, collides with the first fixed contact 11, and collides. A so-called click sound is produced. This is because the kinetic energy of the second movable spring toward the first fixed contact 11 increases as the repulsive force f1 decreases.

  Next, in the second operation state, the inverted dome portion 141 contacts the first movable spring 13. The repulsive force f1 continues to decrease. When the second movable spring 14 comes into contact with the first movable spring 13 and is pushed down toward the substrate 10, the first movable spring 13 generates a repulsive force f2.

  Next, in the third operation state, the first movable spring 13 is pushed down by the pressing force F and contacts the first fixed contact 11. The first movable spring 13 generates a repulsive force f2 with respect to the pressing force F corresponding to the moving distance of the first movable spring 13. That is, the repulsive force with respect to the pressing force F is a force obtained by combining the repulsive force f1 of the second movable spring 14 and the repulsive force f2 of the first movable spring 13. Due to the combination of the two repulsive forces, the decrease in the repulsive force f1 of the second movable spring 14 becomes gradual, and the impact sound caused by the contact of the first movable spring 13 with the first fixed contact is the case where the first movable spring 13 is not present. Smaller than the impact sound. This is because the kinetic energy of the second movable spring toward the first fixed contact 11 is reduced.

  FIG. 3 is a diagram illustrating an example of the relationship between the moving distance (mm) of the second movable spring 14 and the repulsive forces f1 (N) and f2 (N) with respect to the pressing force F when the push switch 1 is pressed. is there.

  The repulsive force f1 of the second movable spring 14 when the first movable spring 13 is not interposed is indicated by a broken line. When the pressing portion 171 is pressed, the second movable spring 14 moves in the direction of the substrate 10. Corresponding to the moving distance of the second movable spring 14, the repulsive force f1 increases and draws a convex curve. When the repulsive force f1 reaches the maximum value M, the dome portion 141 starts to reverse and the repulsive force f1 starts to decrease. When the first movable spring 13 is not provided, the second movable spring 14 rapidly reduces the repulsive force f1 by the reversing operation, and the second movable spring 14 is fixed to the first fixed position, for example, at a point PA, while the repelling force f1 is decreasing. When it collides with the contact 11, a so-called click sound is generated. This is because the kinetic energy of the second movable spring toward the first fixed contact 11 is large.

  Further, when the dome portion 141 is fully reversed, the repulsive force f1 has a minimum point m1 that turns from decreasing to increasing. For example, when the second movable spring 14 collides with the first fixed contact 11 at the point PB after starting to increase, the collision sound is reduced. This is because the kinetic energy of the second movable spring toward the first fixed contact 11 is reduced. However, the moving distance increases. That is, the amount of pressing becomes large.

  On the other hand, the repulsive force when the first movable spring 13 is interposed between the first fixed contact 11 and the second movable spring 14 is shown by a solid line. The repulsive force is a combination of the repulsive force f1 of the second movable spring 14 and the repulsive force f2 of the first movable spring 13. When the second movable spring 14 contacts the first movable spring 13, the first movable spring 13 moves in the direction of the substrate 10. The repulsive force f2 of the first movable spring 13 gradually increases according to the displacement of the first movable spring 13, that is, the moving distance.

  By the combination of the repulsive force f1 of the second movable spring 14 that decreases by the reversal operation and the repulsive force f2 of the first movable spring 13 that increases, the repulsive force has a minimum point m2 that turns from decreasing to increasing. When the first movable spring 13 and the first fixed contact come into contact with each other at the point PA, for example, at the point PA, after the minimum point m2 is passed, the collision is weakened and the collision sound is reduced. This is because the kinetic energy of the first and second movable springs toward the first fixed contact 11 is small. In addition, the amount of movement of the second movable spring can be reduced.

  FIG. 4 is a diagram illustrating an example of a manufacturing method of the push switch 1. 4A shows the first step, FIG. 4B shows the second step after the first step, FIG. 4C shows the third step after the second step, and FIG. (D) shows the 4th process following the 3rd process, and Drawing 4 (e) shows the 5th process following the 4th process.

  First, in the first step, the first fixed contact 11 is formed at the center of the surface of the substrate 10, and the second fixed contact 12 is formed surrounding the first fixed contact 11. The first fixed contact 11 and the second fixed contact 12 are formed of a conductive member such as conductive plastic, for example, and are disposed on the surface of the substrate 10.

  Next, in the second step, the housing member 16 is disposed on the surface of the substrate 10 so as to surround the first fixed contact 11 and the second fixed contact 12. The housing member 16 is bonded to the upper surface of the substrate 10 via an adhesive or an adhesive sheet (not shown).

  Next, in the third step, both ends of the first movable spring 13 in the longitudinal direction are arranged so as to contact the second fixed contact 12. Since the horizontal length of the first movable spring 13 is slightly shorter than the inner length of the rectangular frame of the housing member 16, the operator or the manufacturing apparatus places the first movable spring 13 on the second fixed contact 12. The alignment at the time becomes easy.

  Next, in the fourth step, the second movable spring 14 is disposed on the first movable spring 13. Since the horizontal length of the curved second movable spring 14 is slightly shorter than the horizontal length of the first movable spring 13, the operator or the manufacturing apparatus places the second movable spring 14 on the first movable spring 13. The alignment of the center at the time of arrangement becomes easy.

  Next, in the fifth step, the pressing portion 15 and the protective sheet 17 are disposed on the second movable spring 14. The pressing portion 15 is placed on the second movable spring 14 and the pressing portion 15 is fixed by the protective sheet 17. The peripheral portion of the protective sheet 17 is formed on the upper surface of the housing member 16 with, for example, an adhesive or an adhesive sheet. Affixed to the housing member 16.

  Since the operator or the manufacturing apparatus can easily align the first movable spring 13 and the second movable spring 14, the push switch 1 can be easily manufactured.

(Outline of configuration of push switch in the second embodiment)
In the push switch 1 of the first embodiment, the first movable spring 13 is disposed on the second fixed contact 12. The push switch 2 according to the second embodiment includes a first movable spring 13 and a first movable spring 13 disposed on the second fixed contact by providing a recess in the second fixed contact and storing both ends of the first movable spring in the recess. Make sure that there is no deviation between the two fixed contacts.

  FIG. 5 is an exploded perspective view of the push switch 2 of the second embodiment.

  The push switch 2 is different from the push switch 1 in that the second fixed contact 22 and the first housing member 261 and the second housing member 262 are provided instead of the second fixed contact 12 and the housing member 16. The push switch 2 is further different from the push switch 1 in that the push switch 2 includes a drop prevention sheet 28.

  The second fixed contact 22 is formed with a first recess 222 and a second recess 223 that are a pair of recesses lower than the surface 221 of the second fixed contact that faces the first fixed contact 11. Different from the fixed contact 12. The first recess 222 has a bottom surface on which one end in the longitudinal direction of the first movable spring 13 is disposed, and the second recess 223 has a bottom surface on which the other end in the longitudinal direction of the first movable spring 13 is disposed. The height of the bottom surfaces of the first recess 222 and the second recess 223 from the surface of the substrate 10 is higher than the height of the first fixed contact 11 from the surface of the substrate 10. Since both ends of the first movable spring 13 are accommodated in the first recess 222 and the second recess 223 whose bottom surface height is higher than the height of the first fixed contact 11 from the surface of the substrate 10, the push switch 2 is depressed. In a state where the first movable spring 13 and the first fixed contact 11 are not in contact with each other.

  Since both ends of the first movable spring 13 are housed in the first recess 222 and the second recess 223, respectively, the first movable spring 13 can be prevented from being displaced from the second fixed contact 22.

  A first housing member 261 is disposed on the surface of the substrate 10 so as to surround the first fixed contact 11 and the second fixed contact 22. The height of the first housing member 261 from the surface of the substrate 10 is the same as the height of the second fixed contact 22 from the surface of the substrate 10. The housing member that houses the first fixed contact 11, the second fixed contact 22, the first movable spring 13, and the second movable spring 14 is disposed above the first housing member 261 and the first housing member 261. 2 containing member 262 and arranged on substrate 10.

  The fall prevention sheet 28 is disposed on the first housing member 261. The drop-off prevention sheet 28 prevents the first movable spring 13 from dropping from the second fixed contact 22. The drop-off prevention sheet 28 has, for example, four openings, 281, 282, 283, and 284 so that the second fixed contact 22 and the second movable spring 14 come into contact with each other and are electrically connected. Further, the drop-off prevention sheet 28 may have an opening 285 at the center. This is because when the push switch 2 is pressed and the first movable spring 13 and the second movable spring 14 come into contact with each other, the fall prevention sheet 28 is prevented from being sandwiched and the fall prevention sheet 28 is prevented from being deformed or damaged. The fall prevention sheet 28 is a resin sheet, for example, a polyimide sheet. The drop-off prevention sheet 28 is attached to the first housing member 261 with an adhesive, for example. You may adhere | attach by an adhesive double-sided tape.

  The second housing member 262 is disposed on the drop-off prevention sheet 28 so as to overlap the first housing member 261. The fall prevention sheet 28 is fixed by being sandwiched between the first housing member 261 and the second housing member 262.

  6 is a cross-sectional view taken along the line AA ′ of the exploded perspective view of FIG.

  Both ends of the first movable spring 13 are housed in the first recess 222 and the second recess 223 of the second fixed contact 22, respectively. By aligning both ends of the first movable spring 13 in the first concave portion 222 and the second concave portion 223, the first movable spring 13 and the second fixed contact 22 are aligned when the push switch 2 is manufactured. It becomes easy. Further, both ends of the first movable spring 13 are housed in the first recess 222 and the second recess 223, respectively, so that when the push switch 2 is pressed, the first movable spring 13 is moved to a predetermined position of the second fixed contact 22. It is possible to prevent deviation from the position.

  Further, a drop prevention sheet 28 is provided on the first movable spring 13. The fall prevention sheet 28 is sandwiched and fixed between the first housing member 261 and the second housing member 262. When the first movable spring 13 is lowered in the direction of the substrate 10 by the pressing of the second movable spring 14, the first movable spring 13 is moved from the first concave portion 222 and the second concave portion 223 of the second fixed contact 22. Prevent floating. Therefore, the drop-off prevention sheet 28 can prevent the first movable spring 13 from being displaced from a predetermined position.

  In the manufacturing method of the push switch 2, before the step in which the second movable spring 14 is disposed on the first movable spring 13, the fall prevention sheet 28 is placed between the first housing member 261 and the second housing member 262. It differs from the push switch 1 in that there is a sandwiching process.

(Outline of the configuration of the push switch in the third embodiment)
In the first and second embodiments, the height of the second fixed contact 12 from the substrate 10 is higher than the height of the first fixed contact 11 from the substrate 10. This is because the first fixed contact 11 and the second fixed contact 12 do not conduct when the push switch is not pressed. In the push switch 3 of the third embodiment, the height of the second fixed contact 12 from the substrate 10 is the same as the height of the first fixed contact 11 from the substrate 10 or the height of the first fixed contact 11 from the substrate 10. Even if it is lower than this, the first fixed contact 11 and the second fixed contact 12 do not conduct.

  The push switch 3 according to the third embodiment is different from the push switch 1 according to the first embodiment in that the second fixed contact 32 and the first movable spring 33 are provided instead of the second fixed contact 12 and the first movable spring 13. . The second fixed contact 32 is different from the second fixed contact 12 in that the height from the substrate 10 may not be higher than the height from the substrate 10 of the first fixed contact 11.

  FIG. 7A is a side view of the first movable spring 33 which is an example of the first movable spring used for the push switch 3. FIG. 7B is a cross-sectional view of the push switch 3. FIG. 7C is a side view of a first movable spring 33 ′, which is another example of the first movable spring used for the push switch 3.

  The first movable spring 33 includes a flat plate portion 331, a first contact portion 332, and a second contact portion 333. The first movable spring 33 is formed by bending both ends of a flat spring member such as stainless steel at a right angle by bending. The first contact portion 332 and the second contact portion 333 extend in a direction orthogonal to the extending direction of the flat plate portion 331 from a pair of opposite sides of the flat plate portion 331. The first contact portion 332 and the second contact portion 333 are extended from a pair of opposing sides of the flat plate portion 331 in a direction orthogonal to the extending direction of the flat plate portion 331, thereby moving the movable spring portion 331 and the substrate. The separation distance between the two can be increased.

  The first contact portion 332 and the second contact portion 333 are placed on the second fixed contact 32 and come into contact with the second fixed contact 32. Since the flat plate portion 331 is higher than the height of the first fixed contact 11 by the height of the first contact portion 332 and the second contact portion 333, the first movable spring when the push switch 3 is not depressed. 33 is arranged so as not to contact the first fixed contact 11.

  A first movable spring 33 ′, which is another example of the first movable spring, includes a flat plate portion 331 ′, a first contact portion 332 ′, and a second contact portion 333 ′. The first movable spring 33 ′ is formed by bending both ends of a flat spring member such as stainless steel by 180 ° by bending. Each of the first contact portion 332 ′ and the second contact portion 333 ′ is a flat plate that extends parallel to the extending direction of the flat plate portion 331 ′. The flat plate portion 331 ′ is higher than the height of the first fixed contact 11 by the thickness of the first contact portion 332 ′ and the second contact portion 333 ′. Therefore, when the push switch 3 is not pressed, The 1 movable spring 33 does not contact the first fixed contact 11.

  In the push switch 3 according to the third embodiment, the height of the second fixed contact 32 from the substrate 10 can be the same as the height of the first fixed contact 11 from the substrate 10. The forming process for forming the fixed contact 11 and the second fixed contact 32 is facilitated.

(Variation of substrate, first and second fixed contacts)
FIG. 8 is a diagram illustrating an example of the shape and arrangement of the substrate 10, the first fixed contact 11, and the second fixed contact 12. FIG. 8A shows an example of arrangement on a rectangular substrate. FIG. 8B shows an example of arrangement on a horizontally long rectangular substrate. FIG.8 (c) shows the example of arrangement | positioning in a disk shaped 1st fixed contact.

  FIG. 8A shows an example of the shape and arrangement of the push switch substrate 10, the first fixed contact 11, and the second fixed contact 12 shown in FIG. 1. The substrate 10 has a rectangular shape. A cylindrical first fixed contact 11 is arranged at the center of the substrate 10. A rectangular frame-shaped second fixed contact 12 is disposed so as to surround the first fixed contact 11. In this example, the first fixed contact 11 is disposed at the center of the substrate 10. However, for example, when an electronic component such as an LED light is disposed on the substrate 10, the first fixed contact 11 is disposed at the center of the substrate 10. Not necessary.

  In FIG. 8B, the substrate 10 ′ has a horizontally long rectangular shape. The first fixed contact 11 'has a rectangular shape. The second fixed contact 12 ′ has a rectangular shape, and two second fixed contacts 12 ′ are arranged across the first fixed contact 11 ′. This example can make the shape of the push switch elongated, and is suitable for a push switch for power supply arranged on the side surface of a thin smartphone.

  In FIG. 8C, the substrate 10 ″ has a rectangular shape. The first fixed contact 11 '' has a disk shape. The second fixed contact 12 ″ has a ring shape surrounding the first fixed contact 11 ″. This example is suitable for a round push switch.

(Modification of second movable spring)
FIG. 9 is a cross-sectional view of the push switch 1 for illustrating a modification of the second movable spring 14. FIG. 9A shows an example of the second movable spring 14 made of a leaf spring having one dome portion. FIG. 9B shows an example of a second movable spring 14 ′ in which curved leaf springs 142 and 143 having two dome portions are overlapped. FIG. 9C shows an example of the second movable spring 14 ″ in which the leaf springs 142, 143, and 144 having three dome portions are overlapped.

  By changing the number of leaf springs of the second movable spring 14, it is possible to adjust the push switch pressing distance and the click feeling. A plurality of leaf springs having different spring characteristics may be combined.

  FIG. 10 is a diagram illustrating an example of the relationship between the moving distance (mm) of the second movable spring 14 and the repulsive force (N) with respect to the pressing force F when the push switch 1 is pressed. FIG. 10A shows a case where the second movable spring is constituted by one leaf spring, and FIG. 10B shows a case where the second movable spring is constituted by two leaf springs. ) Is a case where the second movable spring is constituted by three leaf springs.

  A broken line indicates a repulsive force when the first movable spring 13 is not interposed between the first fixed contact 11 and the second movable spring 14. A solid line indicates a repulsive force when the first movable spring 13 is interposed between the first fixed contact 11 and the second movable spring 14. Even if the number of leaf springs constituting the second movable spring is changed to one, two, and three, the repulsive force f1 of the second movable spring 14 that decreases and the repulsive force f2 of the first movable spring 13 that increases By synthesis, the repulsive force has a local minimum that goes from decreasing to increasing. In any case, since the first movable spring 13 and the first fixed contact are in contact with each other in a state where the repulsive force passes the minimum point and the repulsive force increases, the collision is weakened and the collision sound is reduced.

  It should be understood by those skilled in the art that various changes, substitutions, and modifications can be made thereto without departing from the spirit and scope of the present invention.

1-3 Push switch 10 Substrate 11 First fixed contact 12, 22, 32 Second fixed contact 13, 33 First movable spring 14 Second movable spring 15 Pressing portion 16 Storage member 17 Protection sheet 261 First storage member 262 Second Housing member 28 Fall-off prevention sheet

Claims (4)

A substrate,
A first fixed contact disposed on the substrate;
A second fixed contact disposed on the substrate and around the first fixed contact;
A flat plate-shaped first movable spring that is electrically connected to the second fixed contact and does not perform a reversal operation when contacting the first fixed contact;
A second movable spring disposed above the first movable spring and having a dome portion capable of reversing operation;
A pressing portion for pressing the dome portion;
A protective sheet for protecting the first and second fixed contacts from above the pressing portion,
The first movable spring comes into contact with the first fixed contact when the first movable spring is depressed after the pressing portion is depressed and the dome portion is inverted.
Push switch characterized by that. The second fixed contact is formed with a pair of recesses facing each other through the first fixed contact,
One end of the first movable spring is stored in one of the pair of recesses, and the other end of the first movable spring is stored in the other of the pair of recesses,
The push switch according to claim 1. A drop-off prevention sheet disposed between the first movable spring and the second movable spring;
The push switch according to claim 1 or 2. The first movable spring is
A flat plate portion in contact with the first fixed contact;
A first contact portion provided at one end of the flat plate portion and in contact with the second fixed contact;
A second contact portion provided at the other end of the flat plate portion and in contact with the second fixed contact;
Having
The push switch according to claim 1.

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