KR20030067509A - Contact plate and switch device using the same - Google Patents

Abstract

An object of the present invention is to provide a contact plate capable of facilitating the formation of protrusions on the contact plate and having a good operating peeling during press operation even when there is a relative positional deviation from the key top, and a switch device using the same.

In order to solve the above problems, an elastic thin plate (1h: thin plate having elasticity) having a reversible expansion protrusion 1c, a hole 1d penetrating the vertex of the expansion protrusion in the reverse direction, and a through hole 1d And a protruding member (2a) having one end protruding in the expansion protruding direction of the expansion protruding portion, the press portion (2a) transmitting a pressing force from the outside at one end of the protruding member (2). It was.

Description

CONTACT PLATE AND SWITCH DEVICE USING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact plate and a switch device using the same, and relates to a structure of a contact plate suitable for a pushbutton switch of a small electronic device such as a mobile phone and a switch structure using the same.

As a structure of a conventional contact plate and a switch using the same, a contact plate having a base die with a fixed contact formed thereon and a dome-shaped inversion portion disposed opposite the fixed contact on the base die is constituted.

The said contact plate is supposed that the key top part of this upper surface side press action is arrange | positioned, and is used, The upper surface of a contact plate is pressurized by pressing this key top part from the cosmetic panel side of an electronic device, and it is integral with a lower surface. The contact plate is formed by inverting and contacting the fixed contact to switch the contact.

In addition, a projection for pressing the apex of the dome-shaped contact plate is integrally formed on the lower surface of the key top of the pressurizing action. When the key top is pressed, the pressing force is transmitted to the apex of the contact plate through the protrusion. The contact plate inverts the feeling of click and contacts the fixed contact.

In this case, if there is a deviation in the relative position between the projection of the key top surface and the dome vertex portion of the contact plate, it will affect the operation peeling. Therefore, in order to solve this problem, in the conventional configuration, instead of the projection of the key top surface, The structure which transmits the pressing force of a key top to the dome top part of a contact plate is proposed by forming a processus | protrusion with resin on the upper surface of a contact plate.

However, in the structure of the conventional contact plate and the switch device using the same, the thickness of the projections is difficult and precisely formed in order to form the projections by stacking resins by printing or the like on the dome apex of the contact plates. There was no problem.

Accordingly, an object of the present invention is to provide a contact plate and a switch device using the same, which can solve the above-mentioned problems, facilitate the formation of protrusions on the contact plate, and have good operation peeling during the press operation.

1 is a cross-sectional view of a contact plate according to an embodiment of the present invention.

2 is a sectional view of a contact plate according to a modification of the embodiment of the present invention.

3 is a cross-sectional view of a contact plate according to another embodiment of the present invention.

4 is a plan view of a switch apparatus provided with a contact plate according to an embodiment of the present invention.

5 is a cross-sectional view of a switch device provided with a contact plate according to an embodiment of the present invention.

6 is an operation explanatory diagram of a switch device provided with a contact plate according to an embodiment of the present invention.

7 is a facility name diagram of another switch device provided with a contact plate according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

1 Contact plate 1d through hole

1c Expansion protrusion 2 Protruding member

2a Pressing part 2b Contact part

16a Central fixed contact 16b Peripheral fixed contact

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, in this invention, as a 1st means, it is an elastic thin plate (thin plate with elasticity) which has a reversible expansion protrusion part, the hole which penetrates the vertex part of the said expansion projection part in a reverse direction, and falls in the through hole. It is characterized in that it has a protruding member which is kept to be prevented and has one end protruding in the expansion protruding direction of the expansion protruding portion, and a pressurizing portion which transmits a pressing force from the outside at one end of the protruding member.

In addition, as the second means, the protruding member is formed as a conductive member, and the contact portion is formed on the back side of the expansion protrusion at the other end of the pressing portion by passing through the through hole.

Further, as a third means, an uneven portion is formed on the other end surface of the conductive member.

Further, as a fourth means, the periphery of the through hole is protruded in the expansion projection direction of the expansion projection, so that the projection-shaped member is kept in the projection from being prevented from falling out.

Further, as a fifth means, the protruding member is deformed so as to sandwich the expansion protrusion in the plate thickness direction, thereby keeping the protrusion from being prevented.

Further, as a sixth means, the contact plate is integrally attached to the adhesive layer of the pressure sensitive adhesive sheet so that the pasting part can be formed.

In addition, as the seventh means, an opening of a larger diameter than the pressing portion and a diameter smaller than the outer shape of the contact plate is formed in the adhesive sheet, and the pressing portion is exposed to expose the pressing portion from the opening, and the contact plate is attached to the adhesive layer. It is characterized by.

The eighth means is characterized in that the contact plate and the pressure sensitive adhesive sheet are integrally peeled off on the release sheet by the pressure sensitive adhesive layer of the pressure sensitive adhesive sheet.

In addition, as a ninth means, there is provided a contact plate made of any one of the first to the seventh, and a base die on which a fixed contact point and an external connection terminal conducting thereto are arranged, and the contact portion of the contact plate is provided at the fixed contact point. It is characterized in that the pressing portion is disposed on the base die so as to be opposed to and operateable from the outside.

Embodiment of the invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is shown to FIG. 1 is a sectional view of a contact plate according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a contact plate according to a modification thereof, and FIG. 3 is a sectional view of a contact plate according to another embodiment of the present invention. 4 is a plan view of a switch device provided with a contact plate according to an embodiment of the present invention, FIG. 5 is a sectional view of the switch device shown in FIG. 4, and FIG. 6 is a switch device provided with a contact plate according to an embodiment of the present invention. 7 is an explanatory view of a facility of another switch device provided with a contact plate according to an embodiment of the present invention.

In Fig. 1, the contact plate 1 is formed by blanking a conductive metal thin plate 1h made of phosphor bronze or the like on which one surface has been subjected to surface treatment, such as silver, in a substantially disk shape, and the side on which the surface treatment has been performed. As the lower surface, the skirt portion 1b standing up from the outer circumferential edge portion 1a toward the center portion at a predetermined angle and the vertex portion 1c inflated and protruding in a dome shape continuously from the skirt portion 1b are formed by a press mold. It is formed integrally with high precision.

In the center of the apex 1c, a through hole 1d penetrating in the plate thickness direction is formed, and the protruding member 2 in which the conductive material is formed in a columnar shape in the through hole 1d. The pressing portion 2a and the contact portion 2b are integrally formed so as to penetrate in the vertical direction to prevent the falling out.

When sticking the protruding member 2 to the metal thin plate by caulking, it can be performed by the following step.

(1) An electroconductive metal column such as brass, which has been surface-treated with silver plating on one surface in advance, is formed to be slightly smaller in diameter than the diameter of the through hole 1d. In the through-hole 1d of the drilled metal sheet, the plating surfaces of each other are arranged in the same direction,

(2) Next, the conductive metal pillar is deformed by a caulking punch to prevent the metal sheet from falling out in the sheet thickness direction so as to cover the periphery of the through hole 1d from above and below. At this time, the shape of the press part 2a and the contact part 2b is also formed.

(3) In this way, the thin metal plate in which the protruding member 2 is integrated is drawn by the press mold in which the dome-shaped forming portion and the protruding portion of the protruding member 2 are formed, so that the above-described skirt portion 1b and the vertex portion ( A dome shape having 1c) is formed in the metal thin plate to form the contact plate 1.

In this way, by integrating the protruding member 2 into the metal thin plate in advance, and then press-molding the metal thin plate to form a dome shape, it is possible to precisely form the reversible expansion projection and the pressing portion.

In addition, by forming the protruding member 2 from a conductive material, the contact portion can be formed with high accuracy with respect to the inverted expansion projection portion and the pressing portion.

The contact plate 1 formed as described above is disposed on the peripheral fixed contact point, which will be described later, using the lower surface of the outer peripheral edge portion 1a as a sebum surface, and the apex portion is pressed by the outside of the pressing portion 2a. (1c) is reversed to allow contact of the contact portion 2b to the center fixed contact. In addition, since the contact plate 1 is integrated so that the metal thin plate and the conductive member are aligned so that the side on which the surface treatment is applied to each other becomes the lower surface side, the lower surface and the contact portion (1) of the outer peripheral portion 1a in contact with the fixed contact point. Since 2b) becomes a surface treatment surface, such as silver plating, conduction between contacts can be ensured.

In the case where the protruding member 2 is made of a conductive material and adhered to the metal thin plate, projections and grooves or the like may be formed in the contact portion 2b. Multi-contact and line contact can be made, and contact reliability can be further improved.

Further, the inverted spring having the apex may be formed by press molding so as to expand and protrude in a dome shape from the substantially circular outer peripheral edge portion 1a toward the center without forming the skirt portion 1b.

Such a contact plate 1 may carry and store an individual contact plate 1 alone, but the adhesive sheet 3 is attached to the adhesive sheet 3 as in the modified example shown in FIG. 2 from the release sheet 4. ) And the contact plate 1 may be integrally separated. In the contact plate according to the modification, since the contact portion of the contact plate 1 and the adhesive layer are sealed by the release sheet 4, it is possible to prevent ingress of gas or dust from the outside during storage and transportation. Can be handled easily.

The adhesive sheet 3 of FIG. 2 drills the insulating flexible sheet with the adhesive layer which is not shown in the lower surface to a predetermined external shape so that it may become larger diameter than the outer peripheral edge part 1a of the contact plate 1. Formed.

And the upper surface of the skirt part 1b and the vertex part 1c of the contact plate 1 is stuck to the adhesion layer of this adhesive sheet 3, leaving the sticking part 3a on the outer peripheral side. In addition, the whole lower surface is covered with the peeling sheet 4, and it is dust-proof, and the peeling part 3a of the sticking part 3a is peeled and hold | maintained so that peeling with respect to the peeling sheet 4 is carried out.

Moreover, although the said press part 2a may be stuck and maintained by the adhesive sheet 3, the through-hole 3b which can insert the electroconductive part 2 in the adhesive sheet 3 is formed, and the adhesive sheet 3 is carried out. The pressurizing portion 2a may be projected on the upper surface of the upper surface of the upper surface. In this case, the pressurizing portion 2a can be directly pressurized from the outside without passing through the adhesive sheet 3, thereby improving the operation peeling, and at the same time, the peripheral edges of the adhesive sheet 3 and the pressing portion 2a. Since no to-be-adhered part arises between and, the contact plate 1 can be reliably maintained even in long term use.

Next, a contact plate according to another embodiment of the present invention will be described. The same parts as in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted.

In Fig. 3, the contact plate 1 has a periphery of the through hole 1d protruding even higher toward the dome-shaped expansion projection direction, so that the protrusion 1e is formed.

Then, the through hole 1d is made to pass through the protruding member 2 made of an insulating material, and is fixed to prevent the falling out within the height of the protruding portion 1e.

And in the contact plate 1 formed in this way, the apex part 1c is reversed by the pressurization from the exterior of the press part 2a, and the periphery edge part 1f of the protrusion part 1e is the contact part 2b. In contact with the center fixed contact, conduction between the contacts is performed.

Therefore, the lower end of the protruding member 2 fixed to the through hole 1d by caulking or the like can secure a large contact step with the fixed contact without protruding to the lower surface side of the dome-shaped expansion protrusion. It is possible to improve the design freedom in operating peeling setting such as setting of the operation stroke.

Next, the switch apparatus provided with the contact plate which concerns on embodiment of this invention is demonstrated. 4 and 5 show a switch configuration in the case where the above-described contact plate 1 is constituted by a single key switch.

The housing 12 as the base die of the pushbutton switch 10 is made of an insulating material such as synthetic resin, and has a box open at the top by a side wall 11b which stands around the outer circumference of the rectangular bottom plate portion 11a in a circular shape. The shape accommodating part 13 is formed.

In the bottom plate portion 11a of the housing 12, a pair of terminal members made of a conductive metal material is insert molded, one end of which is bent in the bottom plate portion 11a, and the housing portion is inserted. It protrudes in 13, and the center fixed contact 16a is formed.

In addition, one end of the other terminal member branches into two branches in the bottom plate portion 11a, and protrudes through the center fixed contact 16a in the storage portion 13, respectively, so that a pair of peripheral fixed contacts ( 16b) is formed.

The central fixed contact 16a is located in the substantially center of the accommodating part 13 of the housing 12, and the amount of protrusion from the bottom plate part 11a to the accommodating part 13 is peripheral with respect to the central fixed contact 16a. The fixed contact 16b is formed so that it may become slightly high.

And the other end part of the terminal material connected to the center fixed contact 16a is led out of the housing 12, bent along the said side wall 11b, and the external connection terminal 15a which has the solder part for surface mounting is formed. Similarly, at the other end of the terminal member connected to the peripheral fixed contact 16b, an external connection terminal 15b having a soldering portion for surface mounting is formed.

And the said contact plate 1 is accommodated in the recessed accommodating part 13 of the housing 12, the outer peripheral part 1a is mounted on the peripheral fixed contact 16b, and is always in contact, The portion 2d is disposed on the center stationary contact 16a so as to be contact-separated so as to form a movable contact.

And the upper surface of the contact plate 1 accommodated in the housing 12 is covered with the insulating adhesive sheet 3, and the sticking part 3a of the adhesive sheet 3 is the upper surface of the housing 12. It adheres by an adhesive layer to prevent the invasion of dust from the outside.

Next, the switch switching operation of the push button switch configured as described above will be described with reference to FIGS. 5 and 6.

At the time of non-pressurization (initial state shown in FIG. 5) of the operation part 2a of the pushbutton switch 10, the contact of the center stationary contact 16a and the contact plate 1 by the spring force of the contact plate 1 It is separated from the part 2b, and is electrically non-conductive between the peripheral fixed contact 16b, and the switch is kept in the OFF state.

Then, the pressure-sensitive adhesive sheet 3 is bent when the operation part 2a of the contact plate 1 is pressed against the spring force by the key top 20 disposed on a cosmetic panel or the like of the electronic device. The contact plate 1 buckles and inverts while creating a click feeling, while the central fixed contact 16a and the contact portion 2b of the contact plate 1 come into contact with each other (Fig. 6), and the peripheral fixed contact 16b The state of electrical conduction is switched between. That is, the switch is turned on, and a signal is sent to the electronic device through the external connection terminals 15a and 15b.

Thereafter, when the pressing force is released to the operating portion 2a of the contact plate 1, the contact plate 1 self-returns to the state before the inversion by the accumulated spring force, whereby the position of the apex portion of the contact plate 1 Is raised to return to the initial state.

As described above, since the pressing portion 2a is formed in the apex portion 1c of the contact plate 1, the contact plate 1 may be deteriorated due to a mounting error of the key top 20, an inclination when the key top 20 is pressed, or the like. Even if a relative positional deviation from the apex occurs, the pressing force from the key top 20 can be reliably applied to the contact plate 1, and a good operation peeling can be obtained to ensure the switching operation of the switch. Can be.

Therefore, the contact plate of the narrow diameter of the pressable vertex part 1c with a narrow diameter can be used as a movable contact, and the occupation area of the width direction of the housing 12 can be made small, and the external size of a pushbutton switch is downsized. It is possible to reduce the installation area of the electronic device to the substrate.

Next, another switch device provided with the contact plate according to the embodiment of the present invention will be described. FIG. 7 shows a sheet-shaped switch device in which a plurality of the above contact plates 1 are provided on a contact substrate on which fixed contacts are formed.

The contact substrate 30 as the base die in the sheet-shaped switch device is formed of a laminated board such as an insulating resin, and the fixed contact point 31 of the plurality of tanks is formed on the surface by copper foil, carbon, or the like. It is. The fixed contact point 31 is arranged so that the center fixed contact point 31a is arranged inside the peripheral fixed contact point 31b formed in a circular shape, and is connected to an external terminal by a connection pattern, respectively. The outer peripheral edge portion 1a of the contact plate 1 is always mounted on the peripheral fixed contact point 31b, and the contact portion 2d of the contact plate 1 is the central fixed contact point 31a. They are arranged to face each other in contact with each other so as to form movable contacts.

Moreover, the contact plate 1 is covered with the insulating flexible adhesive sheet 35 in which the side in which the press part 2a was formed was formed the adhesion layer in the lower surface. Then, the adhesive layer formed on the bonding portion 35a of the pressure sensitive adhesive sheet 35 is fixed to the upper surface of the contact substrate 30 to form the sheet-shaped switch device 40, and the dust from the outside into the contact portion. It prevents intrusion.

The sheet-shaped switch device 40 configured as described above is assembled to an electronic device by arranging a key top on the upper surface of the flexible adhesive sheet 35, but at the time of assembling, the sheet-shaped switch device 40 is disposed at a relative position between the key top and the contact plate 1. Even if a deviation has occurred, the pressing force from the key top can be reliably applied to the contact plate 1 through the pressing portion 2a, and a good operation peeling can be obtained, and the switching operation of the switch can be reliably performed. .

Therefore, it is possible to use a small diameter contact plate with a narrow range of pressurizable apex portions 1c as a movable contact, and the occupied area in the width direction can be made small, thereby miniaturizing the switch device.

Incidentally, in the description of the above embodiment, the protrusion member 2 is formed of a metal material and coked with the contact plate to be integrated. However, the present invention is not limited to the above, and, for example, the protrusion member 2 It is also possible to integrally mold the deformable protrusions by using conductive rubber or conductive resin, and insert the protrusions into the through-hole 1d of the contact plate to integrate them.

In the description of the above embodiment, the contact plate 1 was previously attached to the pressure-sensitive adhesive sheet to be integrated and then fixed on the base die having the fixed contact, but the present invention is not limited thereto. Alternatively, the contact plate disposed on the base die may be prevented from falling out by a frame or the like. Moreover, it is also possible to comprise so that lifting / lowering can hold | maintain the key top which presses the press part 2a to the base die side which arrange | positioned the contact plate 1.

As described above, the push button switch of the present invention, the elastic thin plate having a reversible expansion projections, a hole penetrating the vertex of the expansion projections in the reverse direction, and maintained so as to prevent falling into the through hole, one end is expanded Since it has a protruding member that protrudes in the protruding direction, and has formed a pressing portion for transmitting the pressing force from the outside at one end of the protruding member, the pressing portion can be easily formed on the expansion protrusion of the contact plate, and the relative position with the key top. Even if there is a deviation, the pressing force can be reliably transmitted to the apex part of the expansion protrusion of the contact plate, and good operation peeling can be obtained.

In addition, since the protruding member is formed of a conductive member and the through-hole is penetrated to form a contact portion on the other side of the expansion projection at the other end of the pressing portion, the pressing portion and the contact portion can be easily formed with high accuracy.

In addition, since the uneven portion is formed on the other end surface of the protruding member formed of the conductive member, the contact point of the contact portion can be made into multiple points, and it becomes possible to reliably conduct with the fixed contact even if foreign matter such as dust enters.

In addition, since the periphery of the through-hole is protruded in the expansion projection direction of the expansion projection, the projection-shaped member is kept to be prevented from falling out in the projection, so that the contact step to the fixed contact can be largely secured, and the design freedom of the contact plate is also achieved. Can improve.

In addition, since the protruding member is deformed so as to be prevented from slipping out so as to sandwich the inflating protrusion in the plate thickness direction, the protruding member can be reliably held with respect to the inflating protrusion, and the amount of protrusion of the pressing portion can be formed with high precision. have.

In addition, since the contact plate is integrally attached to the adhesive layer of the pressure sensitive adhesive sheet so that the pasting part can be formed, the assembly of the contact plate to the switch device can be simplified.

In addition, since the pressure-sensitive adhesive sheet has a larger diameter than the pressing portion and an opening smaller than the outer shape of the contact plate, and exposes the pressing portion from the opening, the contact plate is attached to the adhesive layer. Since it can pressurize directly from outside without passing through, and an operation peeling can be improved and the to-be-adhered part with an adhesive sheet does not arise also around the press part of a contact plate, a contact plate can be hold | maintained reliably.

In addition, since the contact plate and the pressure sensitive adhesive sheet were integrally peeled off on the release sheet by the pressure sensitive adhesive layer of the pressure sensitive adhesive sheet, the contact part and the pressure sensitive adhesive layer can be stored and transported in a protected state, and the handling is easy. I can do it.

Further, there is provided a contact die of any of the first to seventh, and a base die provided with a fixed contact and an external connection terminal conducting thereto, so as to oppose the contact portion of the contact plate to the fixed contact and to operate the pressurization portion from the outside. Since it is disposed on the base die, even when a relative position deviation occurs between the key top and the contact plate, the pressing force of the key top can be reliably transmitted to the apex of the expansion projection of the contact plate, so that good operation peeling can be obtained. have.

Claims (9)

An elastic thin plate having a reversible expansion protrusion (a thin plate having elasticity), a hole that penetrates the vertex of the expansion protrusion in the reverse direction, and is prevented from falling into the through hole so that one end thereof is in the expansion protrusion direction of the expansion protrusion; A contact plate having a protruding protruding member, and a pressing portion for transmitting a pressing force from the outside at one end of the protruding member. 2. The contact plate according to claim 1, wherein the protruding member is formed of a conductive member, and a contact portion is formed on the back side of the expansion protrusion at the other end of the pressing portion through the through hole. The contact plate according to claim 2, wherein an uneven portion is formed on the other end surface of the conductive member. The contact plate according to claim 1, wherein the periphery of the through hole is protruded in the expansion projection direction of the expansion projection so as to keep the projection-shaped member from being prevented from falling out in the projection. The contact plate according to any one of claims 1 to 4, wherein the protruding member is deformed so as to sandwich the expansion protrusion in the plate thickness direction so as to be prevented from coming off. The contact plate according to claim 1, wherein the contact plate is integrally attached to the adhesive layer of the pressure sensitive adhesive sheet so that a pasting portion can be formed on the outer peripheral portion thereof. The adhesive sheet according to claim 6, wherein an opening having a larger diameter than the pressing portion and a diameter smaller than the outer shape of the contact plate is formed in the adhesive sheet, and the pressing portion is exposed by exposing the pressing portion from the opening. A contact plate characterized in that. 8. The contact plate according to claim 6 or 7, wherein the contact plate and the pressure sensitive adhesive sheet are integrally peeled off on the release sheet by the pressure sensitive adhesive layer of the pressure sensitive adhesive sheet. And a base die on which the contact plate as set forth in claim 1 and a fixed contact point and an external connection terminal connected thereto are disposed, the contact part of the contact plate is opposed to the fixed contact point and the pressurization part is operated from the outside. And a switch device arranged on said base die.