JP6847687B2 - Push switch and its manufacturing method - Google Patents

Description

The present invention relates to a push switch and a method for manufacturing the same.

Push switches are known as switches mounted on devices such as mobile phones, portable stereos, video cameras, digital cameras, and in-vehicle audio systems.

Patent Document 1 describes a case provided with a switch contact portion composed of a central contact, an outer contact, and a movable contact, and a push switch having a pressing body and a protective sheet. The movable contact is an elastic thin plate made of metal formed in an upward convex dome shape. The lower end of the outer circumference of the movable contact is placed on the outer contact, and the lower surface of the central portion of the movable contact faces the central contact at a distance. The pressing body is placed on the upper surface of the central portion of the movable contact. The peripheral edge of the protective sheet is welded and fixed to the wall of the case by laser irradiation. The central portion of the protective sheet is welded and fixed to the upper surface of the pressing body by laser irradiation.

FIG. 10 is a graph showing the relationship between the stroke (deformation amount) S of the pressing portion of the push switch and the operating load F of the push switch. The horizontal axis of the graph shows the stroke S, and the vertical axis shows the operating load F. When the stroke S increases by pressing the pressing portion of the push switch, the operating load F increases. Eventually, when the stroke S reaches a predetermined value Sp, the operating load F takes a maximum value (peak load Fp), and the movable contact of the push switch begins to reverse. After that, when the stroke S further increases, the movable contact continues to reverse while the operating load F decreases. When the stroke S eventually reaches a predetermined value Sb, the operating load F takes a minimum value (bottom load Fb), and the movable contacts finish reversing. After the movable contacts have been reversed, the operating load F rapidly increases as the stroke S increases.

Generally, as an index showing the characteristics of the push switch, a peak load indicating the hardness of the pressing operation of the push switch and a click rate indicating the feeling of pressing the push switch are used. The peak load is expressed as an operating load Fp when the movable contact starts to reverse. The click rate is the ratio of the reduction amount (Fp-Fb) of the operating load F from the start of the movable contact to the end of the reversal to the operating load (Fp) when the movable contact starts to reverse ((Fp-Fb)). / Fp).

Japanese Unexamined Patent Publication No. 2013-58380

The peak load and click rate of the push switch can be adjusted by changing the design of the movable contacts. However, since changing the design of the movable contact often involves an increase in manufacturing cost and technical difficulty, there is a request to adjust the peak load and click rate of the push switch without changing the design of the movable contact. ..

Therefore, an object of the present invention is to provide a push switch capable of solving the above-mentioned problems.

Another object of the present invention is to provide a method for manufacturing a push switch whose peak load and click rate can be adjusted without changing the design of movable contacts.

The method for manufacturing a push switch according to the present invention includes a step of arranging a plurality of fixed contacts and movable contacts for conducting the plurality of fixed contacts with each other on the bottom surface of a recess formed in the case, and a first protective sheet. Is sandwiched between the first protective sheet and the pressing member for pressing the movable contact, and the step of fixing the first protective sheet to the upper surface of the side wall of the case so as to cover the plurality of fixed contacts and the movable contact. Press the bonding area with the second protective sheet for the purpose from the first position on the side wall and the first position on the first protective sheet so that the index indicating the characteristics of the push switch becomes a desired value. A step of setting between the second position on the member side and a step of adhering the second protective sheet to the first protective sheet in the bonding region so as to sandwich the pressing member between the first protective sheet and the first protective sheet. It is characterized by having.

The method for manufacturing a push switch according to the present invention preferably further includes a step of adhering the lower surface of the pressing member and the upper surface of the first protective sheet with an adhesive member that covers only a part of the lower surface of the pressing member.

In the method for manufacturing a push switch according to the present invention, the index indicating the characteristics of the push switch is preferably a peak load or a click rate.

The push switch according to the present invention has a case in which a recess is formed, a plurality of fixed contacts arranged on the bottom surface of the recess, and a convex shape, which is deformed by being pressed and a plurality of fixed contacts. A movable contact for conducting each other, a first protective sheet fixed to the upper surface of the side wall of the case so as to cover a plurality of fixed contacts and the movable contact, and a movable contact arranged on the first protective sheet. It has a pressing member for pressing and a second protective sheet that is adhered to the first protective sheet in a predetermined adhesive region and sandwiches the pressing member between the first protective sheet, and the predetermined adhesive region has a predetermined adhesive region. It is characterized in that it is set between the first position on the side wall and the second position on the pressing member side from the first position so that the index indicating the characteristics of the push switch becomes a desired value. And.

In the push switch according to the present invention, the second position is preferably the first position side with respect to the inner wall surface of the side wall.

In the push switch according to the present invention, the second position is preferably closer to the pressing member than the inner wall surface of the side wall.

In the push switch according to the present invention, the index indicating the characteristics of the push switch is preferably a peak load or a click rate.

According to the present invention, it has become possible to provide a push switch in which the peak load and the click rate can be adjusted without changing the design of the movable contact.

It is a perspective view of the push switch 1. It is an exploded perspective view of the push switch 1. It is a top view of the push switch 1. It is a bottom view of the push switch 1. It is sectional drawing along the VV'line shown in FIG. 1 of the push switch 1. (A) to (e) are diagrams for explaining the manufacturing method of the push switch 1. (A) is a cross-sectional view similar to that of FIG. 5 of the other push switch 2, and (b) is a cross-sectional view similar to that of FIG. 5 of the other push switch 3. (A) is a graph showing the relationship between the width d of the adhesive region of the first protective sheet and the second protective sheet of the push switch and the peak load P, and (b) is the first protective sheet and the push switch of the push switch. It is a graph which showed the relationship between the width d of the adhesive area of the 2nd protective sheet, and the click rate C. Further, it is a cross-sectional view similar to FIG. 5 of another push switch 4. It is a graph which showed the relationship between the stroke of a push switch and the operating load.

Hereinafter, the push switch and its manufacturing method will be described in detail with reference to the attached drawings. However, it should be noted that the technical scope of the present invention is not limited to those embodiments, but extends to the inventions described in the claims and their equivalents.

FIG. 1 is a perspective view of the push switch 1. FIG. 2 is an exploded perspective view of the push switch 1. FIG. 3 is a top view of the push switch 1. FIG. 4 is a bottom view of the push switch 1. FIG. 5 is a cross-sectional view of the push switch 1 along the VV'line shown in FIG. In the following, the direction along the VV'line shown in FIG. 1 is defined as the lateral direction of the push switch 1, and the direction perpendicular to the VV'line shown in FIG. 1 is defined as the longitudinal direction of the push switch 1. ..

The push switch 1 has a case 10, a fixed contact 20, a movable contact 30, a first protective sheet 40, an actuator 50, and a second protective sheet 60.

The case 10 is composed of a substrate 11 and a frame body 12. The back surface of the frame body 12 is adhered to the front surface of the substrate 11 by the adhesive 70A. A recess 13 surrounded by the frame body 12 is formed on the surface of the substrate 11.

The frame body 12 is an example of the side wall of the case 10. Reference numeral 12a refers to the inner wall surface of the frame body 12 facing the recess 13, and reference numeral 12b refers to the outer wall surface of the frame body 12 on the opposite side of the inner wall surface 12a. The width of the frame body 12 along the VV'line shown in FIG. 1, that is, the distance between the inner wall surface 12a and the outer wall surface 12b is, for example, 0.5 mm.

The fixed contact 20 is composed of a central fixed contact 21 and a peripheral fixed contact 22. The central fixed contact 21 is a disk-shaped conductor, and is fixed to the surface of the substrate 11 in the recess 13. The peripheral fixed contact 22 is an annular conductor, and is fixed to the surface of the substrate 11 which is the bottom surface of the recess 13 so as to surround the central fixed contact 21.

A pair of first electrodes 23A and 23B and a pair of second electrodes 24A and 24B are formed on the back surface of the substrate 11. The first electrodes 23A and 23B are electrically connected to the central fixed contact 21 via a through electrode (not shown) and a back surface wiring, respectively. The second electrodes 24A and 24B are electrically connected to the peripheral fixed contacts 22 via through electrodes and back surface wiring (not shown, respectively).

The movable contact 30 is a flexible conductive member having a convex shape, and is arranged on the substrate 11 so that its end is in contact with the peripheral fixed contact 22. When the movable contact 30 is pressed, the convex shape is inverted, the central fixed contact 21 and the peripheral fixed contact 22 are electrically connected, and the switch is turned on. The movable contact 30 is made of, for example, stainless steel.

The first protective sheet 40 is, for example, a flexible insulating resin sheet having a thickness of about 0.05 mm. The first protective sheet 40 has a central fixed contact 21, a peripheral fixed contact 22, and a movable contact 30 together with the substrate 11 and the frame 12 because the end portion of the back surface is adhered to the upper surface of the frame body 12 by the adhesive 70B. Is sealed in the recess 13. The upper surface of the central portion of the first protective sheet 40 is adhered to the actuator 50 by the adhesive 70E. The first protective sheet 40 sandwiches the actuator 50 together with the second protective sheet 60.

The actuator 50 is a resin member for pressing the movable contact 30 via the first protective sheet 40. The actuator 50 has, for example, a cylindrical shape having an upper surface and a lower surface having a diameter of about 0.5 mm and a height of about 0.2 mm. The upper surface of the actuator 50 is adhered to the lower surface of the second protective sheet 60 by the adhesive 70D, and the lower surface of the actuator 50 is adhered to the upper surface of the first protective sheet 40 by the adhesive 70E. The actuator 50 is sandwiched between the first protective sheet 40 and the second protective sheet 60. The actuator 50 is an example of a pressing member.

The second protective sheet 60 is, for example, a flexible insulating resin sheet having a thickness of about 0.05 mm. The lower surface of the central portion of the second protective sheet 60 is adhered to the upper surface of the actuator 50 by the adhesive 70D. The second protective sheet 60 sandwiches the actuator 50 together with the first protective sheet 40.

As shown in FIGS. 3 and 5, in the adhesive region T1, the upper surface of the first protective sheet 40 is adhered to the lower surface of the second protective sheet 60 by the adhesive 70C. The adhesive region T1 is an region extending in the width direction of the frame body 12 between the outer wall surface 12b of the frame body 12 and a predetermined position M1 on the inner wall surface 12a side of the frame body 12 with respect to the outer wall surface 12b of the frame body 12. Is. The position M1 corresponds to the inner end of the adhesive region T1, and is set so that the peak load P1 of the push switch 1 is about 1.5 N and the click rate C1 of the push switch 1 is about 0.6. The width d1 of the adhesive region T1 (distance between the outer wall surface 12b of the frame body 12 and the position M1) is about 0.36 mm, which is substantially constant along the circumferential direction of the frame body 12.

6 (a) to 6 (e) are diagrams for explaining a method of manufacturing the push switch 1.

First, as shown in FIG. 6A, the upper surface of the end portion of the substrate 11 to which the first electrodes 23A and 23B, the second electrodes 24A and 24B, and the through electrodes and the back surface wiring (not shown) are provided in advance, and the frame body 12 By adhering the lower surface of the case 10 with the adhesive 70A, a case 10 having a recess 13 can be obtained.

Next, as shown in FIG. 6B, the central fixed contact 21, the peripheral fixed contact 22, and the movable contact 30 are fixed on the bottom surface of the recess 13 of the case 10. The central fixed contact 21 is fixed so as to be conductive with the first electrodes 23A and 23B. The peripheral fixed contact 22 is fixed so as to be conductive with the second electrodes 24A and 24B. The end of the movable contact 30 is fixed on the peripheral fixed contact 22.

Next, as shown in FIG. 6C, by adhering the lower surface of the end portion of the first protective sheet 40 to the upper surface of the frame body 12 with the adhesive 70B, the central fixed contact 21, the peripheral fixed contact 22, and the movable The contact 30 is sealed in the recess 13.

Next, as shown in FIG. 6D, the frame body 12 is located between the outer wall surface 12b of the frame body 12 and the predetermined position M1 on the inner wall surface 12a side of the frame body 12 with respect to the outer wall surface 12b of the frame body 12. The adhesive 70C is applied to the upper surface of the first protective sheet 40 in the adhesive region T1 extending in the width direction of the first protective sheet 40. The predetermined position M1 is set so that the peak load P1 and the click rate C1 of the push switch 1 become desired values.

Next, as shown in FIG. 6E, the lower surface of the end portion of the second protective sheet 60 is pressed by the adhesive 70C so that the actuator 50 is arranged between the first protective sheet 40 and the second protective sheet 60. The push switch 1 is obtained by adhering to the upper surface of the end portion of the first protective sheet 40.

FIG. 7A is a cross-sectional view similar to that of FIG. 5 of the other push switch 2, and FIG. 7B is a cross-sectional view of the other push switch 3 similar to that of FIG.

The push switches 2 and 3 have the same configuration as the push switch 1 except for the adhesive region of the first protective sheet 40 and the second protective sheet 60. The description of the configurations of the push switches 2 and 3 other than the adhesive region of the first protective sheet 40 and the second protective sheet 60 will be omitted. The push switches 2 and 3 can be manufactured by the same manufacturing method as the push switch 1.

As shown in FIG. 7A, in the push switch 2, the upper surface of the first protective sheet 40 is adhered to the lower surface of the second protective sheet 60 by the adhesive 70C in the adhesive region T2. The adhesive region T2 is an region extending in the width direction of the frame body 12 between the outer wall surface 12b of the frame body 12 and a predetermined position M2 on the inner wall surface 12a side of the frame body 12 with respect to the outer wall surface 12b of the frame body 12. Is. The position M2 corresponds to the inner end of the adhesive region T2, and is set so that the peak load P2 of the push switch 2 is about 1.83N and the click rate C2 of the push switch 2 is about 0.5. The position M2 coincides with the inner wall surface 12a of the frame body 12 in the lateral direction of the push switch 2. The width d2 of the adhesive region T2 (distance between the outer wall surface 12b of the frame body 12 and the position M2) is approximately 0.5 mm, which is substantially constant along the circumferential direction of the frame body 12.

As shown in FIG. 7B, in the push switch 3, the upper surface of the first protective sheet 40 of the push switch 3 is adhered to the lower surface of the second protective sheet 60 by the adhesive 70C in the adhesive region T3. The adhesive region T3 is an region extending in the width direction of the frame body 12 between the outer wall surface 12b of the frame body 12 and a predetermined position M3 on the inner wall surface 12a side of the frame body 12 with respect to the outer wall surface 12b of the frame body 12. Is. The position M3 corresponds to the inner end of the adhesive region T3, and is set so that the peak load P3 of the push switch 3 is about 2.38 N and the click rate C3 of the push switch 3 is about 0.41. The position M3 is located closer to the actuator 50 than the inner wall surface 12a of the frame body 12 in the lateral direction of the push switch 3. The width d3 of the adhesive region T3 (distance between the outer wall surface 12b of the frame body 12 and the position M3) is approximately 0.63 mm, which is substantially constant along the circumferential direction of the frame body 12.

FIG. 8A shows an adhesive region between the first protective sheet and the second protective sheet of the push switch (a region extending in the width direction of the frame body 12 between the outer wall surface 12b of the frame body 12 and a predetermined position). It is a graph which showed the relationship between the width d and the peak load P.

The horizontal axis in FIG. 8A indicates the width d of the adhesive region. The vertical axis in FIG. 8A shows the relative peak load magnitude P (%) with the peak load P2 of the push switch 2 as 100%.

As shown in FIG. 8A, the peak load P1 of the push switch 1 is about 82%, and the peak load P3 of the push switch 3 is about 130%. Therefore, shortening the width of the adhesive region of the first protective sheet 40 and the second protective sheet 60 reduces the peak load, and increasing the width of the adhesive region of the first protective sheet 40 and the second protective sheet 60 increases the peak load. To do.

FIG. 8B is a graph showing the relationship between the width d of the adhesive region of the first protective sheet and the second protective sheet of the push switch and the click rate C.

The horizontal axis in FIG. 8B indicates the width d of the adhesive region. The vertical axis in FIG. 8B shows the relative magnitude C (%) of the click rate, where the click rate C2 of the push switch 2 is 100%.

As shown in FIG. 8B, the click rate C1 of the push switch 1 is about 120%, and the click rate C3 of the push switch 3 is about 82%. Therefore, if the width of the adhesive area of the first protective sheet 40 and the second protective sheet 60 is shortened, the click rate C increases, and if the width of the adhesive area of the first protective sheet 40 and the second protective sheet 60 is increased, the click rate C increases. Decreases.

From the above, in the push switch, the peak load and the click rate of the push switch can be adjusted by adjusting the width of the adhesive region of the first protective sheet 40 and the second protective sheet 60.

FIG. 9 is a cross-sectional view similar to that of FIG. 5 of the other push switch 4.

Since the push switch 4 has the same configuration as the push switch 1 except for the adhesive for adhering the first protective sheet 40 and the second protective sheet 60, the description of the configuration other than the adhesive will be omitted. The push switch 4 can be manufactured by the same manufacturing method as the push switch 1.

In the push switch 4, the lower surface of the actuator 50 and the upper surface of the first protective sheet 40 are adhered to each other by an adhesive 70E'. The adhesive 70E'has a circular shape concentric with the upper and lower surfaces of the actuator 50 having a diameter of about 0.27 mm. In the push switch 4, the diameter of the adhesive 70E'is shorter than the diameter of the upper surface and the lower surface (about 0.5 mm) of the actuator 50, and the adhesive 70E'covers only a part of the lower surface of the actuator 50. In the push switch 4, since the adhesive 70E'covers only a part of the lower surface of the actuator 50, the peak load when the push switch 4 is pressed at a position deviated from the central portion C of the push switch 4 shown in FIG. And the variation of the click rate is reduced.

In the above example, the push switch 1 has an adhesive 70D for adhering the upper surface of the actuator 50 to the lower surface of the second protective sheet 60, and an adhesive for adhering the lower surface of the actuator 50 to the upper surface of the first protective sheet 40. It has agent 70E. However, not limited to this, the push switch may not have either the adhesive 70D or the adhesive 70E.

In order to sufficiently secure the adhesive strength of the first protective sheet 40 and the second protective sheet 60, the width d of the adhesive region of the first protective sheet 40 and the second protective sheet 60 is the outer wall surface 12b of the frame body 12 and the frame. It is preferably longer than two-thirds of the distance from the inner wall surface 12a of the body 12.

In order to sufficiently suppress variations in the peak load and click rate of the push switch, the width d of the adhesive region of the first protective sheet 40 and the second protective sheet 60 faces the one outer wall surface 12b of the frame body 12. It is preferably shorter than one-third of the distance from the outer wall surface 12b.

In the push switch 1 described above, the substrate 11 and the frame 12 constituting the case 10 are separated. However, the present invention is not limited to this, and the substrate 11 and the frame body 12 may be integrally configured.

In the push switch 1 described above, the width d1 of the adhesive region T1 is assumed to be about 0.36 mm, which is substantially constant along the circumferential direction of the frame body 12. However, not limited to this, the width of the adhesive region T1 may have different values in the lateral direction and the longitudinal direction of the push switch 1, or may change along the circumferential direction of the frame body 12. ..

In the push switch 1 described above, one end of the adhesive region T1 is assumed to be the outer wall surface 12b of the frame body 12. However, not limited to this, one end of the adhesive region T1 does not necessarily have to coincide with the outer wall surface 12b of the frame body 12.

1, 2, 3, 4 Push switch 10 Case 11 Board 12 Frame 13 Recess 20 Fixed contact 21 Central fixed contact 22 Peripheral fixed contact 23A, 23B 1st electrode 24A, 24B 2nd electrode 30 Movable contact 40 1st protective sheet 50 Actuator 60 2nd protective sheet 70A, 70B, 70C, 70D, 70E, 70E'Adhesive

Claims (5)

A step of arranging a plurality of fixed contacts and movable contacts for conducting the plurality of fixed contacts with each other on the bottom surface of the recess formed in the case.
A step of fixing the first protective sheet to the upper surface of the side wall of the case so as to cover the plurality of fixed contacts and the movable contacts.
An index indicating the characteristics of the push switch is desired for the adhesion region between the first protective sheet and the second protective sheet for sandwiching the pressing member for pressing the movable contact between the first protective sheet. A step of setting between the first position on the side wall and the second position on the first protective sheet on the pressing member side from the first position so as to obtain the value of.
The second protective sheet, the pressing member so as to sandwich between the first protective sheet, have a, a step of bonding the first protective sheet in the bonding region,
The index indicating the characteristics of the push switch is a peak load or a click rate.
A method of manufacturing a push switch, which is characterized in that. The method for manufacturing a push switch according to claim 1, further comprising a step of adhering the lower surface of the pressing member and the upper surface of the first protective sheet with an adhesive member that covers only a part of the lower surface of the pressing member. A case with a recess and
A plurality of fixed contacts arranged on the bottom surface of the recess,
A movable contact that has a convex shape and is deformed by being pressed to conduct the plurality of fixed contacts with each other.
A first protective sheet fixed to the upper surface of the side wall of the case so as to cover the plurality of fixed contacts and the movable contacts.
A pressing member arranged on the first protective sheet for pressing the movable contact,
It has a second protective sheet that is adhered to the first protective sheet in a predetermined adhesive region and sandwiches the pressing member between the first protective sheet and the first protective sheet.
The predetermined adhesive region has a first position on the side wall and a second position on the pressing member side from the first position so that an index indicating the characteristics of the push switch becomes a desired value. It is set between,
The index indicating the characteristics of the push switch is a peak load or a click rate.
A push switch that features that. The push switch according to claim 3 , wherein the second position is closer to the first position side than the inner wall surface of the side wall. The push switch according to claim 3 , wherein the second position is closer to the pressing member than the inner wall surface of the side wall.

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