KR100676665B1 - Sheet having a movable contact attached and push button switch using the same - Google Patents

Abstract

(Problem) Provided is a seat with a movable contact with a good operating feeling and a push button switch using the same, while ensuring a desired operation stroke.

(Measures) The movable contact 3 which has a dome-shaped expansion protrusion 3c, and formed in the shape of an elongate shape in which both side surface parts of the lower edge part 3a of the expansion protrusion 3c opposing was cut out, and the movable contact ( 3) It has the 1st sheet 1 which has the accommodating hole 1a which can accommodate 3, and has the adhesion part 4a in the back surface, and maintains a part of movable contact 3 in this adhesion part 4a, It is provided with the 2nd sheet 4 which covers the upper surface of the accommodating hole 1a of the sheet 1, The accommodating hole 1a of the 1st sheet 1 is formed in the elongate shape which consists of a wide part and a narrow part, The movable contact 3 was accommodated in the accommodating hole 1a corresponding to the narrow width part of the accommodating hole 1a with the both side surface part formed in narrow width of the movable contact 3.

Movable Contact, Push Button Switch

Description

SHEET HAVING A MOVABLE CONTACT ATTACHED AND PUSH BUTTON SWITCH USING THE SAME}

1 is a plan view showing a sheet with a movable contact that is an embodiment of the present invention,

2 is an explanatory view of principal parts showing a receiving hole portion of a sheet with a movable contact according to the present invention;

3 is a plan view showing a movable contact of the present invention,

4 is a sectional view showing the main parts of a sheet with a movable contact according to the present invention;

Fig. 5 is a longitudinal sectional view of the main portion showing the push button switch using the sheet with movable contact according to the present invention;

Fig. 6 is a sectional view of the principal part of a short direction showing a push button switch using a sheet with a movable contact according to the present invention;

7 is an exploded perspective view showing a conventional seat with a movable contact, and

Fig. 8 is a sectional view showing the main parts of a pushbutton switch using a conventional movable contact-attached sheet.

* Explanation of symbols for main parts of drawings *

1: 1st sheet 1a: accommodating hole

1b: connecting groove 2: adhesive

3: movable contact 3a: lower edge

3b: skirt portion 3c: expansion projection portion

3d: opening 3e: abutment

3f: contact portion 4: second sheet

4a: adhesion part 5: release sheet

5a: hole for guide pin 6: insulation board

7: stationary contact 7a: center stationary contact

7b: peripheral fixed contact

The present invention relates to a structure of a push button switch used as a switch for operation of various electronic devices, and in particular, a structure of a movable contact attached sheet and a push button switch in which a dome-shaped expansion protrusion is inverted to perform contact between the contacts. It is about.

As a structure of the conventional movable contact sheet and a push button switch, the structure of the sheet type push button switch which arrange | positioned the movable contact sheet which adhere | attached the several movable contact of a circular dome shape on the adhesive sheet on a board | substrate is known. (For example, refer patent document 1).

7 and 8 show the structures of the conventional movable contact seat and push button switch. Fig. 7 is an exploded perspective view of a conventional seat with a movable contact, and Fig. 8 is a sectional view of the main part of a push button switch using the seat with a conventional movable contact.

In the figure, the plurality of movable contacts 51 are made of a thin metal of a circular dome shape having a spring property such as stainless material or phosphorus bronze and are displaceable with respect to the pressing force from the top. And the movable contact 51 does not have a hole penetrating in a dome shape, but has the contact part 51a which protruded in a dome shape in the center part.

The pressure sensitive adhesive sheet 52 is made of a film material such as a polyester resin, has a plastic sheet-like sheet part 53, a plurality of holes 52a formed in the sheet part 53, and the hole 52a. It consists of the adhesive agent 54 formed in the part except the airway part 55 which consists of a non adhesion part formed in the lower surface of the sheet | seat part 53 excepting ().

The airway portion 55 is formed by screen printing the adhesive 54 on the lower surface of the sheet portion 53, and at least one end thereof is an outer circumferential end of the hole 52a of the adhesive sheet 52 or the adhesive sheet 52. It is connected to an airway port 56 located at the edge 52b. The upper surface of the movable contact 51 is adhered to the pressure-sensitive adhesive 54 of the pressure sensitive adhesive sheet 52, and at least a part of the upper surface of the movable contact 51 and the end portion 51b of the movable contact 51 is an airway part 55. It is adhere | attached in the state mounted on).

The separator 57 consists of a polyester film of substantially the same shape as the adhesive sheet 52, and has the some hole 57a which penetrated through the upper and lower surfaces. In addition, the separator 57 is formed by the pressure-sensitive adhesive 54 of the pressure-sensitive adhesive sheet 52 such that the holes 52a and the hole 57a of the pressure-sensitive adhesive sheet 52 face each other and face each other. Adheres to And this separator 57 comprises the sheet | seat 58 with a movable contact by clamping the movable contact 51 with the adhesive sheet 52, and protecting the lower surface of the movable contact 51. As shown in FIG.

The holes 52a of the pressure sensitive adhesive sheet 52 are holes for exposing light emitting elements such as light emitting diodes (LEDs) not shown, and the sheet unit (not shown) is provided with an operating body (not shown) for pressing and operating the movable contact 51. 53), the light can be efficiently reflected and dimmed.

8 shows a push button switch, and the insulating substrate 59 is made of a flexible substrate such as a polyimide film, and has a circular first fixed contact 59a formed of copper foil on the surface thereof, and the first fixed contact. The substantially C-shaped second fixed contact 59b surrounding the 59a is formed by etching.

Then, by removing the separator 57 adhered to the lower surface of the adhesive sheet 52 of the movable contact sheet 58, the adhesive 54 of the adhesive sheet 52 is exposed to expose the end portion of the movable contact 51. The adhesive sheet 52 is adhered to the upper surface of the insulating substrate 59 by opposing 51b) to the second fixed contact 59b. At this time, the movable contact 51 is in a state where it is mounted on the surface of the insulating substrate 59 in a state where the edge of the end portion 51b is in constant contact with the second fixed contact 59b.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2001-160334

However, in the structure of the conventional seat with a movable contact and push button switch described above, the smaller diameter size for the miniaturization of the movable contact or the narrowing of the pitch at the time of arranging the movable contact for the miniaturization of the entire seat type push button switch. When the movable dome of the circular dome shape is used, the height of the expansion protrusion is lowered by that amount, so that the amount of movement until the expansion protrusion is reversed is small, and there is a problem that a desired feeling of operation cannot be obtained.

Accordingly, an object of the present invention is to provide a movable contact-attached sheet and a push button switch using the same, which can be miniaturized while securing a desired operation stroke and having a good feeling of operation.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, in this invention, as a 1st solution means, the movable contact which has a dome-shaped expansion protrusion part, the both side surface parts which oppose the lower edge part of this expansion protrusion part, was formed in elongate shape, and this movable contact point. A first sheet having an accommodating hole therein and a second sheet having an adhesive portion on a back surface thereof to hold a part of the movable contact at the adhesive portion and to cover an upper surface of the accommodating hole of the first sheet. The accommodating hole of one sheet is formed in the elongate shape which consists of a wide part and a narrow part, and the movable contact is made to the said accommodating hole by making both side surface parts formed with the narrow width of the said movable contact correspond to the narrow part of the said accommodating hole. It was set as the structure accommodated.

Moreover, as a 2nd solution means, a predetermined gap is formed between the inner wall of the said accommodation hole and the outer periphery of the said movable contact, and this clearance gap with respect to the gap with the outer periphery of the said movable contact which opposes the inner wall of the wide part of the said accommodation hole, The clearance gap with the outer periphery of the said movable contact which opposes the inner wall of the narrow part of the said accommodation hole was formed large.

Further, as a third solution means, a plurality of the accommodating holes are formed in the first sheet, the plurality of the movable contacts are accommodated in these accommodating holes, and the narrow portions of the adjacent accommodating holes are adjacent to each other and the adjacent movable contacts are arranged. Width parts were mutually opposed and it was set as the structure which arranged in multiple sets.

Moreover, as a 4th solution means, the adhesive part was formed in the back surface of the said 1st sheet, and it was set as the structure which coat | covered the peeling sheet so that this adhesive part was peelable.

Further, as a fifth solution, the first sheet is provided with a connecting groove for an air flow path between inner walls of the adjacent receiving holes, and covers the receiving hole and the upper surface side of the connecting groove with the second sheet. And a protective sheet covering the receiving hole and the lower surface side of the connecting groove on the lower surface side.

Moreover, as a 6th solution means, the connection direction of the said connection groove was formed along the longitudinal direction of the said movable contact accommodated in the said accommodation hole.

Further, as a seventh solution means, the movable contact includes a skirt portion formed at a predetermined angle from a lower edge portion, and an inverted dome-shaped expansion protrusion continuous to the skirt portion, wherein the skirt edge portion has a lower edge portion. A circular arc larger than a circular arc formed by the center of the dome-shaped expansion protrusion continuous to the upper side was formed, and both ends of the circular arc of the lower edge portion were mounted on the fixed contact of the insulating substrate. Further, as an eighth solution means, the seat with a movable contact according to any one of the first to seventh solutions, a peripheral fixed contact on which the lower edge portion of the movable contact accommodated in the movable contact seat is mounted, and the peripheral fixation. A center fixed contact disposed adjacent to the contact, the lower surface of the top of the dome-shaped expansion protrusion of the movable contact disposed to face each other, and an insulating substrate on which the peripheral fixed contact and the central fixed contact are disposed; One configuration was made.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the movable contact seat and pushbutton switch of this invention are shown in FIGS. 1 is a plan view of a seat with a movable contact of the present invention, FIG. 2 is an explanatory view of essential parts of a receiving hole portion of a seat with a movable contact, FIG. 3 is a plan view of a movable contact, FIG. Fig. 6 is a sectional view of the main part of the push button switch in the long direction using the sheet with movable contact, and Fig. 6 is a sectional view of the main part of the push button switch in the short direction using the sheet with movable contact.

1-4, the 1st sheet 1 is formed in substantially rectangular shape by film materials, such as polyester resin, and the receiving hole 1a which penetrates up and down in the long direction and the short direction is vertically and horizontally. It is arranged in plurality. Moreover, this accommodating hole 1a is formed in the elongate ellipse which consists of a wide part (shown by L1 in FIG. 2), and a narrow part (shown by L2 in FIG. 2), and this long direction and the direction orthogonal to this The wide part and the narrow part of the accommodating hole 1a adjacent to each other are arrange | positioned longitudinally and horizontally in the state which mutually opposed.

Moreover, the said 1st sheet 1 is formed with the connection groove | channel 1b for air flow paths between the inner walls of the said accommodating holes 1a. This connecting groove 1b penetrates up and down similarly to the said accommodating hole 1a, and is formed between the wide part of the accommodating hole 1a adjacent to a longitudinal direction opposing. In addition, when the movable contact 3 mentioned later is accommodated in the said accommodating hole 1a, it is formed along the longitudinal direction of this movable contact 3. Moreover, the adhesive part 2 in which the adhesive agent was apply | coated is formed in the back surface of the said 1st sheet 1. As shown in FIG.

The movable contact 3 is accommodated in the accommodation hole 1a of the said 1st sheet 1. As shown in FIG. The movable contact 3 is made of a conductive thin metal plate, and is formed in a dome shape having an expanded projection that is inverted at the center. That is, the movable contact 3 has the lower edge part 3a mounted on the peripheral fixed contact 7b of the fixed contact point 7 mentioned later, and the skirt part 3b formed in the predetermined angle from this lower edge part 3a. ) And an invertible dome-shaped expansion projection 3c continuous to the skirt portion 3b.

Moreover, the said skirt part 3b is formed in the elongate shape which has opening part 3d in the both side surface part by cutting in parallel in opposing both side surface parts of the movable contact 3, The said lower edge part 3a is A pair is formed in the position which opposes the said expansion projection part 3c in between, respectively. Further, the circular center constituting the outer circumference of the lower edge 3a and the top of the dome-shaped expansion projection 3c continuous to the skirt 3b are formed differently from each other, and the lower edge 3a The size of the outer circumferential circle is formed to be a large arc compared to the size of the outer circumferential circle formed by the center of the dome-shaped expansion projection 3c continuous to the skirt portion 3b.

In addition, both ends of the arc of the lower edge part 3a of the skirt part 3b are formed so that the skirt part 3b becomes a large arc with respect to the trajectory of the arc centered on the top part of the dome-shaped expansion protrusion part 3c. Since both ends are formed to expand outward, these ends are made into the contact part 3e mounted and connected on the peripheral fixed contact 7b of the fixed contact 7 mentioned later.

Moreover, on the back surface of the dome-shaped expansion protrusion 3c, a plurality of protrusions are formed independently on the virtual annular line, avoiding the center of the dome, and forming the contact portion 3f. By pressurizing from the outside so that the dome top part enclosed by these contact parts 3f is bent, the other contact part can come into contact with the central fixed contact 7a even if foreign matter gets stuck in any one contact part.

When the movable contact 3 of the above configuration is mounted on the fixed contact 7, the contact portion 3e abuts on the peripheral fixed contact 7b, and the dome-shaped expansion is continuous to the skirt portion 3b. The protrusions 3c are arranged to face each other in a state spaced apart from the central fixed contact 7a. At this time, the movable contact 3 is formed in a long shape with both side portions of the skirt portion 3b cut in parallel, but the skirt portion 3b and the dome-shaped expansion protrusion portion 3c continuous to the skirt portion 3b are formed in a long direction. It is formed in the size of the outer circumference based on the length. Further, abutting portions 3e expanded outward are formed at both ends of the arc of the lower edge portion 3a of the skirt portion 3b.

Thus, since the movable contact 3 was formed in the elongate shape which formed the opening part 3d in the both side surface parts, the skirt part 3b and the dome-shaped expansion protrusion part 3c which contact | connect can be formed with a large diameter. Therefore, it is possible to provide the movable contact 3 which can be miniaturized while securing a desired stroke. Moreover, while forming the contact part 3f which consists of several protrusion part, a desired stroke can also be ensured and a movable contact with high contact reliability can be provided. Moreover, since the accommodating hole 1a of the said 1st sheet 1 which accommodates the movable contact 3 can be formed in elongate oval shape according to the external shape of the movable contact 3, the accommodating hole 1a is narrowed. Since the arrangement pitch arrange | positioned in the width part direction can be formed small, the miniaturization of the sheet | seat with a movable contact is attained.

Further, in the above embodiment, the opening 3d of the movable contact 3 has been described as being cut out in parallel, but instead, the opening 3d may be cut into an arc shape, and in this case, the opening 3d is narrow in width. It can be formed in a long shape.

Further, a predetermined gap is held between the inner wall of the housing hole 1a and the outer circumference of the movable contact 3. This gap is compared with the inner wall of the narrow part of the accommodating hole 1a as compared with the gap between the inner wall of the wide part of the accommodating hole 1a and the outer periphery of the wide part of the movable contact 3 (indicated by S1 in FIG. 2). The gap with the outer periphery of the narrow part of the movable contact 3 (shown as S2 in Fig. 2) is formed so as to be large (S1 < S2).

Further, the lower edge portion 3a of the skirt portion 3b is formed of an arc larger than an arc formed by the center of the dome-shaped expansion projection portion 3c continuous to the skirt portion 3b, and the lower edge portion ( Since the abutting portion 3e formed at both ends of the circular arc of 3a) is mounted on the peripheral fixed contact point 7b, the bottom edge of the skirt portion 3b is provided by the abutting portion 3e of both ends of the circular arc. Since the part 3a can be made to float from the upper surface of the peripheral fixed contact surface 7b, and the stroke can be enlarged by this much, the installation of the movable contact 3 can be performed stably.

Similarly, the 2nd sheet 4 is formed in film shape, such as polyester resin, in the substantially rectangular shape like the said 1st sheet 1. The second sheet 4 is provided with a pressure-sensitive adhesive portion 4a coated with an adhesive on the back surface, and holds the upper surface of the dome-shaped expansion protrusion 3c of the movable contact 3 in this pressure-sensitive adhesive portion 4a. At the same time, it adheres to the upper surface side of the said 1st sheet 1 in the state which covered the upper surface of the accommodating hole 1a of the said 1st sheet 1. As shown in FIG.

Moreover, the peeling sheet 5 formed from film materials, such as a polyester resin, is affixed on the adhesive part 2 side (lower surface side) to which the adhesive agent of the said 1st sheet 1 was apply | coated. This peeling sheet 5 protects the said movable contact 3 between conveyance and assembly until the said movable contact 3 is mounted on the fixed contact 7 of the insulated substrate 6 mentioned later. . As mentioned above, the sheet | seat with a movable contact is comprised.

In this way, the movable contact 3 is formed into a horizontally long shape with the adjacent openings 3d facing each other, and the plurality of the movable contacts 3 are accommodated in the accommodation holes 1a of the first sheet 1 so that the pitch of the seat with movable contacts is increased. It is possible to narrow down. Moreover, since the lower surface side of the 1st sheet 1 is covered with the said protective peeling sheet 5, handling and assembly can be simplified at the time of conveyance or preparation, and workability improves.

In the present Example, the said peeling sheet 5 is used as a carrier tape at the time of conveyance and assembly of the sheet | seat with a movable contact, and the guide pin hole 5a of an automatic machine is provided in the opposing both sides of the peeling sheet 5 in the longitudinal direction. ) Is formed.

In addition, when forming the accommodation hole 1a which consists of through-holes, and the connection groove 1b in the said 1st sheet 1 for the convenience of an assembly process, the 1st sheet 1 is attached to the said peeling sheet 5. After sticking, it is also possible to punch-in the accommodating hole 1a and the connection groove 1b at the same time. In this case, through-holes are also formed in this release sheet 5, in which case the accommodating hole 1a is formed. ), The protective contact (not shown) which covers these through holes may be formed in the lower surface side of the peeling sheet 5, after accommodating the said movable contact 3 in ().

By forming this protective sheet, it is possible to cover the upper and lower parts of the through hole made of the accommodation hole 1a or the connection groove 1b with the sheet, thereby preventing the ingress of dust from the outside. This protective sheet is to be peeled from the first sheet 1 at the time of assembling the sheet with movable contact to the insulating substrate 6 as in the peeling sheet 5.

In addition, the second sheet 4 is formed as one sheet having a substantially rectangular shape in the same manner as the first sheet 1, but instead is formed as an individual sheet (not shown) composed of a plurality of small pieces. The upper surface of the movable contact 3 accommodated in the receiving hole 1a of the first sheet 1 is individually held by the individual sheet, and the upper surface of the receiving hole 1a is covered separately. You may make it stick to the upper surface side of the 1st sheet | seat 1.

The seat with a movable contact of the above-mentioned structure forms the accommodating hole 1a of the said 1st sheet 1 into the elongate shape which consists of a wide part and a narrow part, and accommodates the both side surface parts in which the width | variety of the said movable contact 3 was narrowed. Corresponding to the narrow portion of the hole 1a, the movable contact 3 is accommodated in the accommodating hole 1a, and the movable contact 3 formed in an elongated shape having a dome-shaped expansion protrusion 3c, Since it accommodated corresponding to the narrow part of the accommodating hole 1a of the said 1st sheet | seat 1, the operation stroke at the time of inversion of the dome-shaped expansion protrusion part 3c can be set large, and miniaturization is possible, and favorable Filling can be obtained. That is, compared with the movable contact 3 having a dome-shaped movable contact having the same diameter as the gap between the two side portions formed with a narrow width, the height of the expansion protrusion can be increased, and the operation stroke can be secured accordingly.

5 and 6 show the configuration of the push button switch using the sheet with movable contact, and the insulating substrate 6 serving as the base is formed of a laminated plate such as a phenol resin, and the insulating substrate 6 The fixed contact 7 printed with the conductive material, such as carbon or silver foil, is formed in the upper surface. This fixed contact 7 is comprised from the center fixed contact 7a formed in the center, and the peripheral fixed contact 7b arrange | positioned opposingly on both sides through this center fixed contact 7a.

In addition, the peripheral fixed contact 7b may oppose a pair, and may connect and arrange in a comb-tooth shape or ring shape. In addition, the peripheral fixed contact 7b may be arrange | positioned only in one place without opposing a pair.

When the above-mentioned movable contact sheet is mounted on the insulating substrate 6, the release sheet 5 is peeled off from the adhesive part 2 side (lower surface side) of the first sheet 1, and the first sheet is peeled off. The adhesive sheet 2 of the sheet 1 causes the first sheet 1 to adhere to the insulating substrate 6. At this time, the contact portion 3e of the movable contact 3 abuts the peripheral fixed contact 7b, and at the same time, the contact portion 3f composed of a plurality of projections on the back surface of the dome-shaped expansion protrusion 3c is provided. In the state spaced apart from the central fixed contact (7a) is arranged to face.

Referring to the operation of the push button switch having the above configuration, in the initial state shown in Figs. 5 and 6, between the two fixed contacts 7a and 7b are not conducted, the switch is in the off state. Here, when the upper surface side of the second sheet 4 is pressed by an operation unit such as an electronic device (not shown), the dome-shaped expansion protrusion 3c of the movable contact 3 is pushed downward and reversed. As a result, the lower surface side contact portion 3f of the expansion projection portion 3c comes into contact with the central fixed contact 7a which is disposed to face each other, and the central fixed contact 7a and the peripheral fixed contact 7b with the movable contact 3 interposed therebetween. This electrically conducting state is turned on so that a signal is output.

Moreover, the operation part of the said electronic device forms the pressurization part which can pressurize, bending the dome part enclosed by the contact part 3f. It is preferable that an operation part provided the pressurization processus | protrusion in the rubber seat, and in this case, even if there is a slight deviation, it can bend the said dome part by deforming the pressurization process of the rubber seat | sheet. Thereby, the contact portion 3f can be surely brought into contact with the center fixed contact 7a.

At this time, the air staying in the accommodating hole 1a flows out into the other accommodating hole 1a adjacent to the connection via the said connection groove 1b with the inversion of the movable contact 3. For this reason, there is no possibility that the operation | movement at the time of inversion of the movable contact 3 may be impaired, and favorable inversion operation is obtained.

In this case, since the air moving by the inversion only flows into the adjacent accommodating hole 1a, it is possible to prevent intrusion of foreign matter into the contact from outside the first and second sheets 1 and 4. In addition, as a means for obtaining a good inversion operation, it is also possible to form an air hole communicating with the accommodation hole 1a in the second sheet 4 or the insulating substrate 6 instead of the connecting groove 1b.

In this case, a predetermined gap is formed between the inner wall of the accommodating hole 1a and the outer periphery of the movable contact 3, which is a gap between the inner wall of the wide part of the accommodating hole 1a and the movable contact 3. The gap S1 between the inner wall of the narrow portion of the accommodating hole 1a and the outer periphery of the movable contact 3 is formed with respect to the gap S1 of the outer periphery of the housing hole 1a. Thus, the adhesion part with the 1st sheet 1 of the said 2nd sheet 4 is enlarged by enlarging the space S2 between the inner wall of the narrow part of the said accommodation hole 1a, and the outer periphery of the movable contact 3. Since 4a) can be moved away from the outer periphery of the narrow direction of the movable contact 3, the restraint of the movable contact 3 by adhesion of the 2nd sheet 4 is eased, and a more reliable inversion operation is possible. It is supposed to be done.

Next, when the pressurization of the second sheet 4 is released in the above state, the movable contact 3 is inverted upward by its own elastic force, and by this inversion, the contact portion on the lower surface side of the expansion protrusion 3c is inverted. The center fixed contact 7a and the peripheral fixed contact 7b are electrically disconnected from the center fixed contact 7a to be turned off.

At this time, since the connection direction of the connection groove 1b which connects between the said accommodation holes 1a is formed along the long direction of the movable contact 3 accommodated in the accommodation hole 1a, the movable contact 3 ), The adhesive portion 4a of the second sheet 4 in the vicinity of the narrow portion of the movable contact 3 can be reliably returned without being attached to the insulating substrate 6, and at the same time, the adhesive portion 4a ) Can be prevented from entering inside the contact.

Thus, the peripheral fixed contact 7b which contacts the contact | attachment part 3e of the lower edge part 3a of the movable contact 3, and the movable contact 3 which contact the sheet | seat with a movable contact which the said movable contact 3 was accommodated in By mounting on the insulated substrate 6 on which the center fixed contact 7a facing the lower surface side of the dome-shaped expansion protrusion part 3c is disposed, the configuration of the sheet-type push button switch can be simply obtained. As a result, it is possible to provide a push button switch which can be miniaturized while increasing reliability and securing a desired stroke.

As described above, the seat with a movable contact of the present invention has a dome-shaped expansion protrusion, a movable contact formed in an elongated shape by cutting both opposite side portions of the lower edge of the expansion protrusion, and a receiving hole capable of accommodating the movable contact. And a second sheet having a pressure-sensitive adhesive portion on the back surface and holding a part of the movable contact at the pressure-sensitive adhesive portion and covering a top surface of the accommodation hole of the first sheet, wherein the accommodation hole of the first sheet is a wide portion. And a movable member formed in an elongated shape having a dome-shaped expansion protrusion because the movable contact is accommodated in the accommodating hole corresponding to the narrow part of the accommodating hole by forming the elongated shape consisting of a narrow and narrow part and having a narrow width of the movable contact. Since the contacts were accommodated corresponding to the narrow portions of the accommodating holes of the first sheet, the operation stroke when the dome-shaped expansion protrusion was reversed was greatly increased. In addition to being able to set, miniaturization is possible and good peeling can be obtained.

In addition, a predetermined gap is formed between the inner wall of the accommodation hole and the outer circumference of the movable contact, and the gap is movable against the inner wall of the narrow portion of the accommodation hole with respect to the gap between the inner wall of the wide contact portion and the outer circumference of the movable contact. Since the gap with the outer circumference of the contact was formed large, the inner wall of the narrow portion of the receiving hole and the movable contact had a large gap with the outer circumference, so that the adhesive part with the first sheet of the second sheet was narrow in the width direction of the movable contact. Since it is possible to move away from, the restraint of the movable contact caused by the adhesion of the second sheet is alleviated, and a more reliable reverse operation is possible.

Further, a plurality of the accommodation holes were formed in the first sheet, the plurality of movable contacts were accommodated in these accommodation holes, and the narrow width portions of the adjacent accommodation holes and the narrow width portions of the adjacent movable contacts were opposed to each other and arranged in a plurality of sets. In addition, it is possible to integrally hold a large number of movable contacts in the first sheet and to narrow the key pitch of the arrangement.

Moreover, since the adhesive part was formed in the back surface of the 1st sheet | seat, and the peeling sheet was coat | covered so that peeling sheet was peeled off, this assembly becomes easy to assemble and handle the sheet | seat with a movable contact to the insulating board, and prevents adhesion of dust to an adhesive part. can do.

Further, the first sheet is provided with a connecting groove for air flow path between inner walls of adjacent receiving holes, and covers the upper surface side of the receiving hole and the connecting groove with the second sheet, while the lower surface side has the lower surface side of the receiving hole and the connecting groove. Since the protective sheet is formed to cover the air, the air remaining in the dome-shaped expansion protrusion moves to the adjacent receiving hole through the connecting groove when the movable contact is inverted, so that the upper and lower sides of the receiving hole or the connecting groove can be blocked by the sheet. Uh, it is possible to prevent the intrusion of dust from the outside.

In addition, since the connecting direction of the connecting groove is formed along the long direction of the movable contact accommodated in the accommodation hole, the adhesive portion of the second sheet near the narrow portion of the movable contact is not attached to the insulating substrate at the time of inversion of the movable contact. At the same time, the pressure-sensitive adhesive can be prevented from entering into the contact.

Further, the movable contact includes a skirt formed at a predetermined angle from the lower edge portion, and a reversible dome-shaped expansion protrusion continuous to the skirt portion, and the center of the dome-shaped expansion protrusion which extends the lower edge portion of the skirt portion to the skirt portion. Since both ends of the arc of the lower edge portion are mounted on the fixed contact point of the insulating substrate, the lower edge portion of the skirt portion can be lifted from the fixed contact surface by both ends of the arc. The stroke can be made larger. Moreover, installation of a movable contact can be performed stably.

Further, the movable contact-attached sheet according to any one of the first to seventh solving means, the peripheral fixed contact on which the lower edge portion of the movable contact housed in the movable contact-attached sheet is mounted, and are disposed adjacent to the peripheral fixed contact, The center fixed contact with the bottom surface of the dome-shaped expansion protrusion of the dome-shaped expansion projection provided with a contact therebetween and an insulating substrate with the peripheral fixed contact point and the center fixed contact point are provided, thereby increasing the reliability and securing the desired stroke. Possible push button switches can be provided.

Claims (8)

A first sheet having a dome-shaped inflation protrusion and having a movable contact formed in an elongated shape in which both side surface portions of the lower edge of the inflation protrusion are opposed to each other, a receiving hole capable of accommodating the movable contact, and an adhesive part on the back surface And a second sheet covering a top surface of the accommodating hole of the first sheet while maintaining a part of the movable contact in the adhesive portion, wherein the accommodating hole of the first sheet has an elongated shape consisting of a wide portion and a narrow portion. And the movable contact is accommodated in the accommodating hole corresponding to the narrow width portion of the accommodating hole, the both side portions having a narrow width of the movable contact formed therein. 2. The accommodation according to claim 1, wherein a predetermined gap is formed between an inner wall of the accommodation hole and an outer circumference of the movable contact, and the gap is provided with respect to a gap with the outer circumference of the movable contact that faces the inner wall of the wide portion of the accommodation hole. A sheet with a movable contact, characterized in that a large gap between the inner wall of the narrow portion of the hole and the outer circumference of the movable contact is formed. The said 1st sheet | seat is provided with the said accommodating hole in multiple numbers, and accommodates the said movable contact in these accommodating holes, and the narrow part of the adjacent said accommodating hole is adjacent, A sheet with a movable contact, characterized in that a plurality of sets are arranged with the narrow width portions of the movable contact facing each other. 4. The sheet with movable contact according to claim 3, wherein an adhesive part is formed on the back surface of the first sheet, and a peeling sheet is coated so as to be peelable. The said 1st sheet | seat is formed in the said 1st sheet | seat, the connection groove | channel for air flow paths between the inner walls of the said accommodating holes, and covers the upper surface side of the said accommodation hole and the said connection groove | channel with the said 2nd sheet | seat, and is accommodated And a protective sheet covering the receiving hole and the lower surface side of the connection groove on a lower surface side of the release sheet having a hole and a connection groove formed thereon. The movable contact attaching sheet according to claim 5, wherein the connecting direction of the connecting groove is formed along the longitudinal direction of the movable contact accommodated in the accommodation hole. 2. The movable contact according to claim 1, wherein the movable contact includes a skirt portion formed at a predetermined angle from a lower edge portion, and an inverted dome-shaped expansion protrusion successive to the skirt portion, and the lower edge portion of the skirt portion. A sheet with a movable contact, characterized in that it is formed of an arc larger than an arc formed by the center of a continuous dome-shaped expansion protrusion, and both ends of the arc of the lower edge portion are mounted on a fixed contact of an insulating substrate. The movable contact-attached sheet according to any one of claims 1, 2, and 7, a peripheral fixed contact on which a lower edge portion of the movable contact accommodated in the movable contact attached sheet is mounted, and the peripheral fixed contact. And a central fixed contact disposed adjacent to each other, the lower surface of the top of the dome-shaped expansion protrusion of the movable contact so as to be opposed to each other, and an insulating substrate on which the peripheral fixed contact and the central fixed contact are disposed. Push button switch.

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