Push mechanism of push switch and push switch

Abstract

Provided are a push mechanism of a push switch that achieves both good tactile feel and thinness, and a push switch. The push mechanism of the push switch includes: an operating member that can be pushed; and a leaf spring member that has a dome portion that is raised in a dome shape and an opening portion provided at the center of the dome portion, and the operating member generates a tactile feel through the reversal of the dome portion caused by being pushed by the operating member; the operating member includes a first pushing portion and a second pushing portion, the first pushing portion passes through the opening portion to push a movable contact member against a fixed contact member, and the second pushing portion pushes the dome portion.

Description

Technical Field

[0001] The invention relates to a pushing mechanism of a push switch and the push switch. Background Art

[0002] In the past, there was a key switch device having the following parts: a switch panel having an opening in the center; a key top arranged above the switch panel; a pair of link members provided between the key top and the switch panel, supporting the key top so that it can be raised and lowered while maintaining the key top in a horizontal position; a diaphragm arranged below the switch panel, opening or closing contacts of a circuit by the lifting and lowering movement of the key top; and a rubber dome arranged between the diaphragm and the key top, acting in a manner to close the contacts as the key top moves downward (for example, refer to Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-060601 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] However, the conventional key switch device has a problem that it is difficult to reduce the thickness of the key switch device because the rubber dome is relatively thick. Although the rubber dome provides a good tactile feeling when operating the key top, it is not easy to reduce the thickness of the key switch device.

[0008] Therefore, an object of the present invention is to provide a push mechanism of a push switch and a push switch that achieve both good tactile feel and thinness.

[0009] Means for solving technical problems

[0010] The pushing mechanism of the push switch of the embodiment of the present invention includes: an operating member capable of performing a pushing operation; and a leaf spring member having a dome portion raised in a dome shape and an opening portion provided at the central part of the dome portion, wherein the operating member generates a tactile sensation through the reversal action of the dome portion caused by being pushed by the operating member; the operating member includes a first pushing portion and a second pushing portion, the first pushing portion passes through the opening portion to push the movable contact member against the fixed contact member, and the second pushing portion pushes the dome portion.

[0011] Effects of the Invention

[0012] A push switch push mechanism and a push switch that achieve both good tactile feel and thinness can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a plan view showing the pressing mechanism of the push switch according to the first embodiment.

[0014] Figure 2 It is a side view showing the pressing mechanism of the push switch according to the first embodiment.

[0015] Figure 3 It is a bottom view showing the pressing mechanism of the push switch according to the first embodiment.

[0016] Figure 4 This is an exploded view of the push mechanism of the push switch.

[0017] Figure 5 Yes means Figure 1 A diagram of the cross section viewed in the direction of A-A.

[0018] Figure 6 It is a figure which shows the cross section of a membrane switch.

[0019] Figure 7 This is a diagram showing the bottom side of a stem.

[0020] Figure 8 It is a diagram showing the FS characteristics of the push mechanism of the push switch.

[0021] Fig. 9 It is a perspective view showing a pressing mechanism of a push switch according to a modified example of the first embodiment.

[0022] Fig.10 It is a diagram showing a push switch according to the second embodiment.

[0023] Fig.11 This is an exploded view of the push switch.

[0024] Fig.12 It is a diagram showing a pressing mechanism of a push switch according to a third embodiment.

[0025] Fig.13 This is an exploded view of the push mechanism of the push switch. DETAILED DESCRIPTION

[0026] Hereinafter, embodiments of a push switch and a push switch to which the present invention is applied will be described.

[0027] <Implementation Method 1>

[0028] Figure 1 This is a plan view showing the pressing mechanism 100 of the push switch according to the first embodiment. Figure 2 1 is a side view showing the pressing mechanism 100 of the push switch according to the first embodiment. Figure 3 It is a bottom view showing the pressing mechanism 100 of the push switch according to the first embodiment. Figure 4It is an exploded view of the push mechanism 100 of the push switch. Figure 5 Yes means Figure 1 A diagram of the cross section viewed in the direction of A-A. Figure 6 It is a diagram showing a cross section of the membrane switch 10 .

[0029] exist Figure 5 In the figure, the top of the key 20 of the keyboard is shown as an example above the push mechanism 100 of the push switch. The push mechanism 100 of the push switch can be used as a push mechanism of each key top 20 of the keyboard as an example. A pantograph type guide member may be provided between the push mechanism 100 of the push switch and the key top 20. However, the use of the push mechanism 100 of the push switch is not limited to the push mechanism of the key top 20, and any push switch that can be operated by pushing may be used.

[0030] The following description uses the XYZ coordinate system. In addition, for the convenience of explanation, the -Z direction side is called the lower side or lower, and the +Z direction side is called the upper side or upper, but this does not mean a universal upper and lower relationship. In addition, plane observation refers to XY plane observation.

[0031] like Figure 1 and Figure 2 As shown, the push mechanism 100 of the push switch includes a housing 110, a leaf spring 120, a thermal compression plate 125 and a base 130. The push mechanism 100 of the push switch is arranged on the membrane switch 10 (refer to Figure 4 ) above. The push mechanism 100 of the push switch and the membrane switch 10 constitute the push switch.

[0032] like Figure 4 and Figure 6 As shown, the membrane switch 10 comprises a lower sheet 11, a fixed contact 11A, an upper sheet 12, a movable contact 12A and a support portion 13. The lower sheet 11, the upper sheet 12 and the support portion 13 are insulators, and the fixed contact 11A and the movable contact 12A are conductors. Wiring 11A1 and 12A1 are connected to the fixed contact 11A and the movable contact 12A, respectively.

[0033] The lower side piece 11 and the upper side piece 12 are bonded with the support portion 13 sandwiched therebetween. The support portion 13 has a through hole 13A which is circular in plan view at the center portion, and the fixed contact 11A provided on the upper surface of the lower side piece 11 and the movable contact 12A provided on the lower surface of the upper side piece 12 are arranged opposite to each other inside the through hole 13A.

[0034] When upper side piece 12 is not pressed from above, fixed contact 11A and movable contact 12B are not electrically connected. However, if movable contact 10B is pressed from above, fixed contact 10A and movable contact 10B are electrically connected.

[0035] When the pressing mechanism 100 of the push switch is pressed in the −Z direction relative to the base 130 , the movable contact 12A of the membrane switch 10 is pressed in the −Z direction relative to the fixed contact 11A. As a result, the membrane switch 10 is turned on.

[0036] The housing 110 is made of resin, and is a plate-shaped member (casing) having equal lengths in the X-axis direction and the Y-axis direction and having a thickness in the Z-axis direction.

[0037] The housing 110 has a housing portion 111 penetrating in the thickness direction. The lower surface of the housing 110 is attached to a portion of the upper sheet 12 of the membrane switch 10 that is supported by the support portion 13 in a plan view, via an adhesive sheet or the like.

[0038] The leaf spring 120 is stored in the storage portion 111. The storage portion 111 is located in the center of the housing 110 when viewed from above. Figure 4 As shown, there is a leg storage portion 111A and a supporting portion 111B. The leg storage portion 111A extends from the inner circumference of the storage portion 111 toward the four corners of the housing 110, and is a portion that extends the storage portion 111. The leg storage portion 111A does not penetrate the lower surface of the housing 110, and has a shape that is recessed from the upper surface side. In other words, the leg storage portion 111A has a bottom (a structure with a bottom). A supporting portion 111B is provided at the bottom of the leg storage portion 111A. The supporting portion 111B is the bottomed portion of the leg storage portion 111A. The leg storage portion 111A stores the leg 123 of the leaf spring 120, and the front end of the leg 123 is supported by the supporting portion 111B.

[0039] The leaf spring 120 is an example of a leaf spring member made of a metal leaf spring having elasticity and conductivity. The leaf spring 120 is arranged in the storage portion 111 .

[0040] Leaf spring 120 Figure 4 As shown, the dome portion 121 has a raised shape, an opening 122 provided near the top of the dome portion 121 , and a leg portion 123 for supporting the dome portion 121 .

[0041] The dome portion 121 has a dome-shaped Figure 4 The dome portion 121 has a shape that is raised in the +Z direction and is circular when viewed in the XY plane. The dome portion 121 has a shape that can reverse the direction of the raised portion by a push operation from the raised direction (+Z direction). In addition, it has elasticity that returns to the original raised direction if the push is released.

[0042] The leg portions 123 are formed to extend outward from the outer peripheral end of the dome portion 121. The leg portions 123 extend outward and in the -Z direction from the outer peripheral end of the dome portion 121, and are bent at the bent portion 123A so as to extend outward and in the +Z direction. Therefore, the bent portion 123A protrudes in the pressing direction (-Z direction) of the leaf spring 120 more than the dome portion 121.

[0043] The bent portion 123A is not housed inside the leg housing portion 111A. Instead, a portion of the leg 123 that is located forward of the bent portion 123A is housed inside the leg housing portion 111A, and the front end of the leg 123 is supported by the support portion 111B.

[0044] In this way, since the front end of the leg portion 123 is supported by the support portion 111B, the leaf spring 120 is stably held inside the storage portion 111 .

[0045] The leg portion 123 supports the outer peripheral end of the dome portion 121 when the dome portion 121 is reversed by the pushing operation, and has elastic force to bend after the reverse movement of the dome portion 121. In addition, the leaf spring 120 as described above can be formed by punching a metal plate using a die, or by a combination of punching and bending.

[0046] The leaf spring 120 is disposed in the housing portion 111 of the housing 110 , and is disposed so that the base 130 is in contact with the top side of the dome portion 121 .

[0047] Thermal compression sheet 125 (refer to Figure 4 ) is provided for joining the leaf spring 120 and the base 130. The heat-compression bonding sheet 125 is a sheet-like component that melts when heated and hardens when cooled to join the leaf spring 120 and the base 130. The heat-compression bonding sheet 125 has a circular opening 125A when viewed from a plane. The opening size of the opening 125A is larger than the dome portion 121 of the leaf spring 120. This is to prevent the dome portion 121 from being hindered from reversing.

[0048] Next, the base 130 will be described. Figure 7 Provide explanation. Figure 7 It is a diagram showing the bottom surface side of the base 130 .

[0049] Base 130 such as Figure 4 , Figure 5 and Figure 7 As shown, the base 130 has a base 131, a flange 132, a protrusion 133, and a convex portion 134. The base 130 is made of resin as an example, and is an example of an operating member. The user can directly touch the base 130 with his hand or the like to operate it, or it can be operated via a member provided on the base 130.

[0050] When the base 130 is pressed in the Z direction, a pressing force acts downward from the upper surface of the base 131. The base 130 has a structure as described below so that when the leaf spring 120 is reversed due to being pressed downward from the upper surface of the base 131, the base 130 is further crushed and deformed in the Z direction so that the upper surface of the base 130 is further displaced downward. Thus, the displacement of the upper surface of the base 130 in the Z direction from the reverse movement of the leaf spring 120 to the further downward displacement of the upper surface of the base 130 is called overtravel.

[0051] The base 131 is a portion located at the center of the base 130 and has a disk shape. The base 131 has a concave portion 131A on the upper surface and a protrusion 133 and a convex portion 134 on the lower surface.

[0052] The recessed portion 131A is a portion that is recessed downward from the upper surface of the base 131. The recessed portion 131A is circular when viewed from a plane. The recessed portion 131A is provided because, by reducing the area of ​​the upper surface of the base 131, when a pressing force acts downward from the upper surface of the base 131, the load per unit area acting on the upper surface of the base 131 becomes larger. This is because, if so, the base 131 is easily crushed in the Z direction, and a larger overstroke can be obtained.

[0053] Furthermore, the recess 131A is provided in the central portion of the upper surface of the base 131 for the following reason. In order for the key top 20 to stably press the base 131, the area where the lower surface of the key top 20 contacts the upper surface of the base 131 is preferably as wide as possible. The term "as wide as possible" means that the dimensions of the area where the lower surface of the key top 20 contacts the upper surface of the base 131 are larger in the X and Y directions. This is because when the key top 20 contacts the base 131 in an area where the dimensions in the X and Y directions are larger, the key top 20 is more stable with respect to the base 131. This is because, when the recess 131A is provided in the central portion of the upper surface of the base 131, it is sufficient not to reduce the dimensions of the area where the lower surface of the key top 20 contacts the upper surface of the base 131 in the X and Y directions, and the key top 20 can stably press the upper surface of the base 131 around the recess 131A. In this way, by providing the recessed portion 131A in the central portion of the upper surface of the base 131 , the upper portion of the base 131 (the portion surrounding the recessed portion 131A) forms a ridge portion having an annular shape in plan view.

[0054] The flange 132 is a disc-shaped protrusion that protrudes radially outward from the lower side of the side surface of the base 131. The outer shape of the flange 132 is rectangular (square) when viewed in a plan view, and is located around the base 131 that is circular when viewed in a plan view. The annular portion 132A (see FIG. 1 ) at the center of the flange 132 is Figure 4) is an annular portion connected to the periphery of the base 131 and is a portion that is easily displaced in the Z direction.

[0055] The diameter of the flange 132 matches the inner diameter of the storage section 111. That is, the shape and size of the base 130 when viewed from the plane are roughly equal to the shape and size of the portion after the leg storage section 111A is removed from the storage section 111. This is to suppress the swing of the base 130 accompanying the up and down movement. In addition, Figure 5 This is a cross section not including the leg storage portion 111A.

[0056] The protrusion 133 is an example of the first pressing portion, and is a disc-shaped portion protruding downward from the lower surface of the base 131. The protrusion 133 is provided to push the center of the upper sheet 12 of the membrane switch 10 downward through the opening 122 of the leaf spring 120 when the upper surface of the base 131 is pressed downward and the leaf spring 120 reverses. Therefore, the protrusion 133 is provided at the center of the base 131 when viewed from the lower surface side, and has a disc-shaped shape having a smaller diameter than the opening 122.

[0057] The diameter of the protrusion 133 is set to be smaller than the diameter of the base 131. That is, the area of ​​the protrusion 133 observed from the lower surface side is smaller than the area of ​​the cross section of the surface parallel to the XY plane of the portion of the base 131 below the recess 131A. In other words, the protrusion 133 is smaller than the base 131 when viewed from a plane. This is because, when the base 130 is pushed from above, the weight per unit area acting on the protrusion 133 is made larger than the load per unit area acting on the base 131, so that the protrusion 133 is easily deformed and crushed in the Z direction. At this time, the base 131 is also crushed in the Z direction, but by making the protrusion 133 easier to crush in the Z direction than the base 131, a larger overstroke can be obtained.

[0058] In addition, the lower end of the protrusion 133 is located closer to the -Z direction than the convex portion 134 when the base 130 is not pressed in the -Z direction. This is because the protrusion 133 passes through the opening 122 of the leaf spring 120 to push the center of the upper sheet 12 of the membrane switch 10 downward, so it is easy to push the membrane switch 10 by protruding further in the -Z direction than the convex portion 134 that pushes the dome portion 121 around the opening 122.

[0059] The convex portion 134 is an example of a second pressing portion, and protrudes downward from the lower surface of the base portion 131, and is formed in an annular shape on the outside of the protrusion portion 133 so as to surround the periphery of the protrusion portion 133. That is, the protrusion portion 133 is provided inside the convex portion 134 which is annular in plan view. The convex portion 134 avoids the opening portion 122 in the center portion of the dome portion 121, and is provided at a position abutting against the dome portion 121 around the opening portion 122.

[0060] The convex portion 134 is provided to push the dome portion 121 of the leaf spring 120 downward and reverse the dome portion 121. By providing such a convex portion 134, it is easy to push the dome portion 121 downward, and a structure that can more reliably perform the reverse action can be realized. In addition, since the protrusion 133 is provided inside the convex portion 134, which is annular in shape when viewed from a plane, it is possible to make a configuration in which the protrusion 133 can easily pass through the opening 122 of the leaf spring 120, and it is possible to make a structure in which stress is easily applied to the protrusion 133 when the base 130 is pushed downward. In addition, the convex portion 134 only needs to be able to push the dome portion 121 of the leaf spring 120 evenly in the downward direction, so it is not limited to a structure formed in a circular ring in a manner that surrounds the protrusion 133, and it can be a ring such as a rectangular ring.

[0061] The annular convex portion 134 and the circular opening portion 122 have similar shapes. Having similar shapes means that the convex portion 134 and the opening portion 122 are both circular. In addition, the shapes are not limited to circular, and may be elliptical or polygonal with three or more sides.

[0062] In the initial state where the base 130 is not pressed, the convex portion 134 is separated from the dome portion 121, and the protrusion 133 is located above the opening 122 of the leaf spring 120 (see Figure 5 ), the membrane switch 10 is not pushed. Therefore, the membrane switch 10 is in a non-conducting state.

[0063] When the base 131 of the base 130 is pushed, the convex portion 134 pushes the dome portion 121 to a certain extent, and the dome portion 121 is reversed, and the protrusion 133 passes through the opening 122 of the leaf spring 120, and pushes downward the portion where the movable contact 12A is located in the upper side sheet 12 of the membrane switch 10. As a result, the membrane switch 10 is turned on.

[0064] In this state, the inverted dome portion 121 presses the surrounding portion where the support portion 13 of the membrane switch 10 is located, so the dome portion 121 is not displaced further downward.

[0065] If the base 131 of the base 130 is further pressed, the base 130 is crushed in the Z direction, whereby the upper surface of the base 131 is displaced downward, and an overstroke is obtained at this time.

[0066] If the pressing operation of the base 130 is released, the base 130 returns to the initial state due to the elastic force of the leaf spring 120 .

[0067] Figure 8 This is a graph showing the FS (Force-Stroke) characteristics of the push switch push mechanism 100. The horizontal axis is the stroke (S) for pushing the base 130 downward, and the vertical axis is the force (F) required to push the base 130 downward. The force (F) is the operating load of the base 130.

[0068] The stroke in the initial state is from 0 mm to 0.2 mm, which is a range in which the convex portion 134 of the base 130 does not contact the dome portion 121 of the leaf spring 120. Such a range is called a free stroke. The operating load in the free stroke range is a load required to displace the base 131 of the base 130 downward relative to the flange 132. In the free stroke range, the base 131 is displaced downward relative to the flange 132 by the deformation of the annular portion 132A on the central side of the flange 132.

[0069] Furthermore, if the convex portion 134 of the base 130 is in contact with the dome portion 121 of the leaf spring 120 in the initial state, there is no free stroke interval, and the FS characteristic starts at a stroke of 0.2 mm. In this way, a structure without a free stroke interval is also possible.

[0070] When the stroke reaches 0.2 mm, the convex portion 134 of the base 130 contacts the dome portion 121 of the leaf spring 120. When the stroke further increases, the convex portion 134 pushes the dome portion 121 downward, and the operating load reaches a maximum value of about 0.7 N at a stroke of about 0.36 mm.

[0071] If the stroke exceeds about 0.36 mm, the dome portion 121 reverses, and at a stroke of about 0.7 mm, the operating load becomes a minimum value of about 0.35 N. When the dome portion 121 is reversed, the protrusion 133 of the base 130 passes through the opening 122 of the leaf spring 120 and presses the membrane switch 10, so that the membrane switch 10 becomes conductive (open).

[0072] If the stroke exceeds about 0.7 mm, the dome portion 121 is held in an inverted state, and the base 130 is crushed in the Z direction, which is an over-stroke interval. The over-stroke interval is the interval between 0.7 mm and 0.8 mm. When the stroke is 0.8 mm, the operating load reaches 1 N.

[0073] As described above, by using a leaf spring 120 having an opening 122 in the center portion of the dome portion 121, and a base 130 having a protrusion 133 that passes through the opening 122 to push the membrane switch 10, and a convex portion 134 that pushes the dome portion 121, a tactile sensation caused by the reversal action of the leaf spring 120 can be generated on the base 130, and a larger overtravel after the reversal action of the leaf spring 120 is completed can be achieved.

[0074] Therefore, it is possible to provide a push switch push mechanism 100 that achieves both good tactile sensation and thinness. The good tactile sensation is an effect obtained by the overtravel of the base 130. In addition, the thinness is an effect obtained by the protrusion 133 of the base 130 passing through the opening 122 of the leaf spring 120 and pushing the membrane switch 10.

[0075] In addition, although the embodiment using the adhesive sheet 150 has been described above, the same is true when using an adhesive, a sticky agent, or an adhesive sheet.

[0076] Furthermore, in the above description, the leaf spring 120 has four legs 123 , but the number of the legs 123 of the leaf spring 120 is not limited to four as long as the leaf spring 120 can be supported relative to the housing 110 .

[0077] In addition, the push mechanism 100 of the push switch can also be Fig. 9 Deformed as shown. Fig. 9 1 is a perspective view showing a push switch pressing mechanism 100M according to a modified example of the first embodiment. The push switch pressing mechanism 100M is different from the first embodiment in that it includes a base 130M instead of the base 130. Figures 1 to 4 The push switch shown has a different push mechanism 100 .

[0078] The base 130M has a base portion 131M and a flange portion 132. Fig. 9 Although not shown, the base 130M has a protrusion 133 and a convex portion 134 (see Figure 5 and Figure 7 ). The base 130 is made of resin, for example, and is an example of an operating member. The base 130M has a structure in which the base 131 of the base 130 is replaced with a base 131M.

[0079] The base 131M is located at the center of the base 130M and has a disk-like shape. The base 131M has a recess 131MA and a groove 131MB formed on the upper surface. The recess 131MA and the recess 131A (see Figure 1 and Figure 4) is the same and is provided in the central part of the upper surface of the base 131M. The groove 131MB is formed in the upper part of the base 131M (the part surrounding the recess 131MA) in a manner recessed from the upper surface to the bottom. Such a groove 131MB is provided to make it easy for the upper part of the base 131M to be crushed when pushed from above. As an example, four grooves 131MB are provided at equal intervals in the circumferential direction of the upper part of the base 131M. Even if such a groove 131MB is formed, the upper part of the base 131M is also annular when viewed from a plane.

[0080] In this way, by providing the recess 131MA in the central portion of the upper surface of the base 131M and providing four grooves 131MB in the annular portion of the upper portion of the base 131M, the area of ​​the upper surface of the base 131M can be made smaller. Thus, when a pushing force acts downward from the upper surface of the base 131M, the load per unit area acting on the upper surface of the base 131M becomes larger, and the base 131M is easily crushed in the Z direction, and a larger overtravel can be obtained. Therefore, it is possible to provide a push switch push mechanism 100M that achieves both good tactile feel and thinness.

[0081] In addition, the number of grooves 131MB is not limited to 4, for example, it can also be 3, 8, 16, etc. The number of grooves 131MB is preferably multiple (more than two). This is because, by having multiple grooves, when a pushing force is applied downward from the upper surface of the base 131M, it is easy to equalize the load per unit area acting on the upper surface of the base 131M, which can provide a better sense of touch. In addition, the multiple grooves 131MB are preferably arranged at equal intervals in the circumferential direction of the upper part of the base 131M when viewed in a plane. This is because, by arranging the multiple grooves 131MB at equal intervals in the circumferential direction, when a pushing force is applied downward from the upper surface of the base 131M, it is possible to equalize the load per unit area acting on the upper surface of the base 131M, which can provide a better sense of touch.

[0082] <Implementation Method 2>

[0083] Fig.10 This is a diagram showing a push switch 200 according to a second embodiment. Fig.11 It is an exploded view of the push switch 200. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0084] The push switch 200 includes a housing 210, a leaf spring 250, a leaf spring 220, a thermal compression sheet 125, and a base 130. Figure 5 In addition, the push switch 200 may also include a Fig. 9 Base 130M is shown.

[0085] The housing 210 is made of resin and is a plate-shaped member (housing) having equal lengths in the X-axis direction and the Y-axis direction and having thickness in the Z-axis direction. The housing 210 is different from the housing 110 of the first embodiment in that the housing portion 211 has a bottom. A central contact 212A and a side contact 212B are provided inside the housing portion 211. The central contact 212A is an example of a first fixed contact member, and the side contact 212B is an example of a second fixed contact member.

[0086] Center contact 212A is disposed at the center of the bottom of housing 211 and connected to terminal 213A protruding from housing 210. Side contact 212B is disposed at the side of the bottom of housing 211 and connected to terminal 213B protruding from housing 210.

[0087] The leaf spring 250 and the leaf spring 220 are stacked and stored in the storage portion 211. The leaf spring 220 is stacked on the leaf spring 250. The storage portion 211 is located in the center of the housing 210 in a planar view.

[0088] The leaf spring 250 is an example of a movable contact member. The leaf spring 250 is bent so that the central portion 251 bulges upward relative to the four corners 252, and the curved side 253 extending in the Y direction on the ±X direction side contacts the side contact 212B. If the central portion 251 is pressed downward from the upper side, the leaf spring 250 reverses and the central portion 251 contacts the central contact 212A. As a result, the central contact 212A and the side contact 212B are connected by the leaf spring 250.

[0089] The storage section 211 includes a leg storage section 211A and a support section 211B. The leg storage section 211A and the support section 211B are the same as the leg storage section 111A and the support section 111B of the housing 110 in the first embodiment, respectively.

[0090] The leaf spring 220 is an example of a leaf spring member, and is a leaf spring having elasticity and conductivity. The leaf spring 220 may not have conductivity, and may be made of metal or resin, etc. The leaf spring 220 is arranged on the leaf spring 250 in the storage portion 211 .

[0091] The leaf spring 220 has the same shape and function as the leaf spring 120 of the first embodiment, and includes a dome portion 221 having a raised shape, an opening 222 provided near the top of the dome portion 221 , and a leg portion 223 for supporting the dome portion 221 .

[0092] The leaf spring 220 has four legs 223, and each leg 223 has a bent portion 223A. The legs 223 and the bent portion 223A are the same as the legs 123 and the bent portion 123A of the leaf spring 120 in Embodiment 1. The front ends of the legs 223 are supported by the support portion 211B, so that the leaf spring 220 is stably held inside the storage portion 211.

[0093] In the push switch 200 of the second embodiment, in the initial state where the base 130 is not pushed, the protrusion 134 (see Figure 5 ) and the dome portion 221 are separated, and the protrusion 133 (refer to Figure 5 ) is located above opening 222 of leaf spring 220 and does not press central portion 251 of leaf spring 250. Therefore, central contact 212A and side contact 212B are in a non-conductive state.

[0094] When the base 131 of the base 130 is pushed, the convex portion 134 pushes the dome portion 221 to a certain extent, and the dome portion 221 is reversed, and the protrusion 133 passes through the opening 222 of the leaf spring 220, and pushes the central portion 251 of the leaf spring 250 downward. As a result, the leaf spring 250 conducts the central contact 212A and the side contact 212B, and the push switch 200 is turned on.

[0095] In this state, dome portion 221 does not further move downward because inverted dome portion 221 pushes center contact 212A via center portion 251 of inverted leaf spring 250. Center portion 251 of leaf spring 250 abuts against center contact 212A, and protrusion 133 passes through opening 222 and pushes center portion 251 of leaf spring 250.

[0096] If the base 131 of the base 130 is further pressed, the base 130 is crushed in the Z direction, so that the upper surface of the base 131 is displaced downward, and an overstroke is obtained at this time.

[0097] If the pressing operation of the base 130 is released, the base 130 returns to the initial state due to the elastic force of the leaf spring 220 .

[0098] As described above, by using a leaf spring 220 having an opening 222 at the center portion of the dome portion 221, and a base 130 having a protrusion 133 that passes through the opening 222 and pushes the central portion 251 of the leaf spring 250, and a convex portion 134 that pushes the dome portion 221, a tactile sensation caused by the reversing action of the leaf spring 220 can be generated in the base 130, and a larger overtravel after the reversing action of the leaf spring 220 is completed can be achieved.

[0099] Therefore, it is possible to provide a push switch 200 that achieves both good tactile sensation and thinness. The good tactile sensation is an effect obtained by the overtravel of the base 130. In addition, the thinness is an effect obtained by the protrusion 133 of the base 130 passing through the opening 222 of the leaf spring 220 and pressing the central portion 251 of the leaf spring 250.

[0100] In addition, although the embodiment using the adhesive sheet 150 has been described above, the same is true when using an adhesive, a sticky agent, or an adhesive sheet.

[0101] Furthermore, in the above description, the leaf spring 220 has four legs 223 , but the number of the legs 223 of the leaf spring 220 is not limited to four as long as the leaf spring 220 can be supported relative to the housing 210 .

[0102] Furthermore, when the leaf spring 220 is made of metal, the push switch 200 may not include the leaf spring 250. In this case, the number of the side contacts 212B is set to four and they are located below the bent portions 223A of the four legs 223 of the leaf spring 220, so that the four side contacts 212B are in contact with the bent portions 223A of the four legs 223 of the leaf spring 220. Furthermore, when the dome portion 221 of the metal leaf spring 220 is pushed by the convex portion 134 of the base 130 and reverses, the dome portion 221 may abut against the center contact 212A, so that the center contact 212A and the side contacts 212B are connected through the leaf spring 220. In this case, the protrusion 133 of the base 130 passes through the opening 222 of the leaf spring 220 and pushes the center of the center contact 212A.

[0103] <Implementation Method 3>

[0104] Fig.12 This is a diagram showing a pressing mechanism 300 of a push switch according to a third embodiment. Fig.13 It is an exploded view of the push switch pressing mechanism 300. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0105] The push mechanism 300 of the push switch includes a housing 110, a leaf spring 120, a thermal compression plate 125, and a base 130. Figure 5 In addition, the push mechanism 300 of the push switch may also include a Fig. 9 Base 130M is shown.

[0106] The pressing mechanism 300 of the push switch is mounted on the substrate 50. The pressing mechanism 300 of the push switch and the substrate 50 constitute the push switch.

[0107] The substrate 50 is a wiring substrate, and a center contact 51A and a side contact 51B are provided on the upper surface. The center contact 51A and the side contact 51B are connected to terminals (not shown) via wiring or the like provided inside or on the lower surface of the substrate 50 .

[0108] The housing 110 is made of resin, is a plate-shaped member (casing) having equal lengths in the X-axis direction and the Y-axis direction and having a thickness in the Z-axis direction. The plate spring 120 is accommodated in the accommodation portion 111 .

[0109] The leaf spring 120 is an example of a leaf spring-shaped movable contact member, and is a leaf spring having elasticity and conductivity. The leaf spring 120 is made of metal and has conductivity. The lower surfaces of the bent portions 123A of the four legs 123 of the leaf spring 120 are in contact with the side contacts 51B.

[0110] In the push switch pressing mechanism 300 of the third embodiment, in the initial state where the base 130 is not pressed, the protrusion 134 (see Figure 5 ) and the dome portion 121 are separated, and the protrusion 133 (refer to Figure 5 ) is located above the opening 122 of the leaf spring 120. Figure 5 ) does not push the dome portion 121 downward, and the leaf spring 120 does not reverse, so the central contact 51A and the dome portion 121 are not in contact, and the central contact 51A and the side contact 51B are in a non-conductive state.

[0111] When base 131 of base 130 is pushed, convex portion 134 pushes dome portion 121 to a certain extent, dome portion 121 is inverted, and protrusion 133 passes through opening 122 of leaf spring 120, pushing center contact 51A downward. When inverted dome portion 121 contacts center contact 51A, leaf spring 120 conducts center contact 51A and side contact 51B.

[0112] In this state, since inverted dome portion 121 presses the outer periphery of inverted center contact 51A, dome portion 121 does not move further downward. Also, protrusion 133 passes through opening 122 and presses the center of center contact 51A.

[0113] If the base 131 of the base 130 is further pressed, the base 130 is crushed in the Z direction, whereby the upper surface of the base 131 is displaced downward, and an overstroke is obtained at this time.

[0114] If the pressing operation of the base 130 is released, the base 130 returns to the initial state due to the elastic force of the leaf spring 120 .

[0115] As described above, by using the leaf spring 120 having the opening 122 at the center portion of the dome portion 121, and the base 130 having the protrusion 133 that passes through the opening 122 to push the center portion of the central contact 51A, and the convex portion 134 that pushes the dome portion 121, a tactile sensation caused by the reversing action of the leaf spring 120 can be generated in the base 130, and a larger overtravel after the reversing action of the leaf spring 120 is completed can be achieved.

[0116] Therefore, it is possible to provide a push switch push mechanism 300 that achieves both good tactile sensation and thinness. The good tactile sensation is an effect obtained by the overtravel of the base 130. In addition, the thinness is an effect obtained by the protrusion 133 of the base 130 passing through the opening 122 of the leaf spring 120 and pushing the center contact 51A.

[0117] In addition, although the embodiment using the adhesive sheet 150 has been described above, the same is true when using an adhesive, a sticky agent, or an adhesive sheet.

[0118] Furthermore, in the above description, the leaf spring 120 has four legs 123 , but the number of the legs 123 of the leaf spring 120 is not limited to four as long as the legs 123 of the leaf spring 120 can support the leaf spring 120 relative to the housing 110 .

[0119] Furthermore, when the leaf spring 120 is made of an insulator such as resin, the leaf spring 250 of the second embodiment may be provided between the leaf spring 120 and the substrate 50, and the leaf spring 250 pushed by the leaf spring 120 may be configured to conduct the center contact 51A and the side contact 51B. In this case, the convex portion 134 reverses the leaf spring 120 and the dome portion 121 pushes the leaf spring 250 downward to reverse the leaf spring 120, thereby conducting the center contact 51A and the side contact 51B through the leaf spring 250. Furthermore, the protrusion 133 passes through the opening 122 to push the leaf spring 250, and the leaf spring 250 is pushed against the center contact 51A. The protrusion 133 is crushed in the Z direction while abutting against the center contact 51A via the leaf spring 250, thereby obtaining an overtravel.

[0120] As mentioned above, the pressing mechanism of the push switch and the push switch according to the exemplary embodiments of the present invention have been described, but the present invention is not limited to the specifically disclosed embodiments, and various modifications and changes can be made without departing from the scope of the claims.

[0121] In addition, the present international application claims priority based on Japanese Patent Application No. 2019-222452 filed on December 9, 2019, the entire contents of which are incorporated herein by reference.

[0122] Description of symbols

[0123] 100, 300 Push switch push mechanism

[0124] 120 Leaf Spring

[0125] 121 Dome

[0126] 122 Opening

[0127] 130 Base

[0128] 131 base

[0129] 131A concave part

[0130] 132 Flange

[0131] 133 protrusion

[0132] 134 convex part

[0133] 200 Push switch

[0134] 210 Housing

[0135] 220 Leaf Spring

[0136] 221 Dome

[0137] 222 Opening

[0138] 250 Leaf Spring

Claims

1. A push mechanism for a push switch, comprising: An operating component capable of performing a pushing operation; as well as The leaf spring member has a dome portion protruding in a dome shape and an opening portion provided at the center of the dome portion, and the operating member generates a tactile sensation through the reverse movement of the dome portion caused by being pushed by the operating member. The operating member comprises a first pushing portion, a second pushing portion and a recessed portion, wherein the first pushing portion passes through the opening portion to push the movable contact member against the fixed contact member, the second pushing portion pushes the dome portion, and the recessed portion is provided on a pushing surface on which a pushing force brought about by a pushing operation acts, and is recessed from the pushing surface in a pushing direction. The recessed portion is provided at a central portion of the pressing surface.

2. The push switch push mechanism according to claim 1, The movable contact member and the fixed contact member are formed of diaphragms.

3. The push switch push mechanism according to claim 1 or 2, The second pressing portion is annular in plan view, and the first pressing portion is located inside the annular second pressing portion in plan view.

4. The push switch push mechanism according to claim 1 or 2, The second pressing portion and the opening have similar shapes when viewed in plan.

5. The push switch push mechanism according to claim 1 or 2, The operating member includes a base portion, and the first pressing portion and the second pressing portion are provided on a surface of the base portion opposite to the pressing surface, wherein the first pressing portion is smaller than the base portion in plan view.

6. The push switch push mechanism according to claim 1 or 2, The first pressing portion protrudes toward the movable contact member more than the second pressing portion.

7. The push switch push mechanism according to claim 1 or 2, The second pressing portion is located outside the first pressing portion in plan view.

8. A push mechanism for a push switch, comprising: An operating component capable of performing a pushing operation; as well as The leaf spring-shaped movable contact part has a dome-shaped raised dome portion and an opening portion provided at the central portion of the dome portion. The dome portion is reversed by being pushed by the operating part, so that the operating part generates a tactile sensation. The push mechanism of the push switch is mounted on a substrate having a first fixed contact member and a second fixed contact member, and when the movable contact member is not pushed by the operating member, the movable contact member contacts the second fixed contact member. The operating member includes a first pressing portion and a second pressing portion, the first pressing portion passes through the opening to press the first fixed contact member or the substrate, and the second pressing portion presses the dome portion against the first fixed contact member.

9. The push switch push mechanism according to claim 8, The second pressing portion is annular in plan view, and the first pressing portion is located inside the annular second pressing portion in plan view.

10. The push switch push mechanism according to claim 8, The second pressing portion and the opening have similar shapes when viewed in plan.

11. The push switch push mechanism according to claim 8, The operating member has a base having the first pressing portion and the second pressing portion provided on a surface opposite to a pressing surface on which a pressing force due to a pressing operation acts, wherein the first pressing portion is smaller than the base in a plan view.

12. The push switch push mechanism according to claim 8, The first pressing portion protrudes toward the movable contact member more than the second pressing portion.

13. The push switch push mechanism according to claim 8, The second pressing portion is located outside the first pressing portion in plan view.

14. A push mechanism for a push switch, comprising: An operating component capable of performing a pushing operation; a leaf spring member having a dome portion protruding in a dome shape and an opening portion provided at a central portion of the dome portion, wherein the dome portion is reversed by being pushed by the operating member to provide a tactile sensation to the operating member; and The leaf spring-shaped movable contact member performs a reverse motion when pushed by the leaf spring member. The push mechanism of the push switch is mounted on a substrate having a first fixed contact member and a second fixed contact member, and when the movable contact member is not pushed by the leaf spring member, the movable contact member contacts the second fixed contact member. The operating member includes a first pushing portion and a second pushing portion, wherein the first pushing portion passes through the opening to push the movable contact member or the substrate, and the second pushing portion pushes the movable contact member against the first fixed contact member by pushing the dome portion against the movable contact member.

15. The push switch push mechanism according to claim 14, The second pressing portion is annular in plan view, and the first pressing portion is located inside the annular second pressing portion in plan view.

16. The push switch push mechanism according to claim 14, The second pressing portion and the opening have similar shapes when viewed in plan.

17. The push switch push mechanism according to claim 14, The operating member has a base having the first pressing portion and the second pressing portion provided on a surface opposite to a pressing surface on which a pressing force due to a pressing operation acts, wherein the first pressing portion is smaller than the base in a plan view.

18. The push switch push mechanism according to claim 14, The first pressing portion protrudes toward the movable contact member more than the second pressing portion.

19. The push switch push mechanism according to claim 14, The second pressing portion is located outside the first pressing portion in plan view.

20. A push switch, comprising: An operating component capable of performing a pushing operation; A leaf spring-shaped movable contact member having a dome-shaped raised dome portion and an opening portion provided at a central portion of the dome portion, wherein the dome portion is reversed by being pushed by the operating member to provide a tactile sensation to the operating member; and The housing has a housing portion for housing the movable contact member and a first fixed contact member and a second fixed contact member provided inside the housing portion. The movable contact member contacts the second fixed contact member. The operating member includes a first pressing portion and a second pressing portion, the first pressing portion passes through the opening to press the first fixed contact member, and the second pressing portion presses the dome portion against the first fixed contact member.

21. The push switch according to claim 20, The operating member has a recessed portion provided at a location where a pressing force acts, and the pressing force is generated by the pressing operation.

22. The push switch according to claim 20, The second pressing portion is annular in plan view, and the first pressing portion is located inside the annular second pressing portion in plan view.

23. The push switch according to claim 20, The second pressing portion and the opening have similar shapes when viewed in plan.

24. The push switch according to claim 20, The operating member has a base having the first pressing portion and the second pressing portion provided on a surface opposite to a pressing surface on which a pressing force due to a pressing operation acts, wherein the first pressing portion is smaller than the base in a plan view.

25. The push switch according to claim 20, The first pressing portion protrudes toward the movable contact member more than the second pressing portion.

26. The push switch according to claim 20, The second pressing portion is located outside the first pressing portion in plan view.

27. A push switch, comprising: An operating component capable of performing a pushing operation; The leaf spring member has a dome portion protruding in a dome shape and an opening portion provided at a central portion of the dome portion, and the operating member generates a tactile sensation through a reverse movement of the dome portion caused by being pushed by the operating member; A leaf spring-shaped movable contact member that performs a reverse motion when pushed by the leaf spring member; and The housing has a housing portion for housing the leaf spring member and the movable contact member, and a first fixed contact member and a second fixed contact member provided inside the housing portion. The movable contact member contacts the second fixed contact member. The operating member includes a first pushing portion and a second pushing portion, the first pushing portion passes through the opening to push the movable contact member, and the second pushing portion pushes the movable contact member against the first fixed contact member by pressing the dome portion against the movable contact member.

28. The push switch according to claim 27, The operating member has a recessed portion provided at a location where a pressing force acts, and the pressing force is generated by the pressing operation.

29. The push switch according to claim 27, The second pressing portion is annular in plan view, and the first pressing portion is located inside the annular second pressing portion in plan view.

30. The push switch according to claim 27, The second pressing portion and the opening have similar shapes when viewed in plan.

31. The push switch according to claim 27, The operating member has a base having the first pressing portion and the second pressing portion provided on a surface opposite to a pressing surface on which a pressing force due to a pressing operation acts, wherein the first pressing portion is smaller than the base in a plan view.

32. The push switch according to claim 27, The first pressing portion protrudes toward the movable contact member more than the second pressing portion.

33. The push switch according to claim 27, The second pressing portion is located outside the first pressing portion in plan view.

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