KR100885045B1 - Improved tact switch - Google Patents

Abstract

A tact switch is provided to improve reliability of a product and click feeling of a switch by minimizing moving distance of a dome switch in elastic deformation. A through-hole is formed at a center part of a first electrode plate(110). A dome switch(120) is formed at the through-hole of the first electrode plate. A portion of the dome switch is protruded into the through-hole of the first electrode plate. The remaining portion of the dome switch is electrically contacted with an inner circumference of the through-hole. A plurality of protrusions(111) are formed at an inner circumference of the through-hole in the first electrode plate. The dome switch is electrically connected with the first electrode plate through a plurality of protrusions. An insulating part(130) is installed at lower parts of the first electrode plate and the dome switch. The insulating part insulates a bottom surface of the first electrode plate and a portion of a bottom surface of the dome switch. A second electrode plate(140) is formed at a lower part of the insulating part. The second electrode plate is contacted with a central part of the dome switch which is transformed by press. Therefore, the second electrode plate is electrified with the first electrode plate.

Description

IMPROVED TACT SWITCH

The present invention relates to a tact switch, and more particularly, to an improved tact switch that is easy to manufacture and that can be surface mounted on a circuit board of an electronic product.

In general, the tact switch is used as a switch for manipulating the function of an electronic product. The tact switch may be manufactured as a single component separate from the circuit board of the electronic product and installed on a circuit board. There is a form directly installed on the circuit board of the product.

The former form is mainly used when the size of the electronic product is large and there is room for installation. The latter form is mainly used when the size of the electronic product is small and thin and there is no space in the installation space.

The tact switch, which is directly installed on a circuit board of an electronic product, typically has a dome switch in the shape of a thin circular plate made of a conductive metal material having a self-elasticity in the convex shape of the center, a sheet of paper installed around the dome switch, and the dome. It consists of a switch and a film sheet installed on the top of the sheet sheet.

1, when a tact switch is used as a keypad switch of an electronic product, for example, a mobile communication terminal, a plurality of dome switches corresponding to the positions of the tact switches printed on the surface of the circuit board 20 ( 10 is disposed, and the sheet paper 30 is attached between each dome switch 10, and a protective film is laminated on the dome switch 10 and the sheet paper 30.

Accordingly, when the center portion of the dome switch 10 is pressed, the center portion is deformed by pressing the center portion, and when the pressing force is removed, the center portion is returned to its original position by its elasticity to perform the switching operation.

However, such a conventional tact switch is produced by arranging the dome switch 10 in accordance with a circuit designed on the circuit board 20 in the manufacturing process, and stacking the sheet paper 30 and the film paper 31 on the arranged dome switch 10. The process is very demanding and complicated.

In addition, the conventional tact switch includes a production process by manual operation, and there is a problem in that a defect occurrence rate is increased along with a problem that production time is increased.

In addition, in the conventional tact switch, each mold is required to produce a dome switch, sheet paper, film paper, and the like, and the development cost increases, and when the pattern of the circuit board is changed, there is a problem that a new mold with the changed pattern must be manufactured. have.

On the other hand, Korean Patent Application Publication No. 202008-18449 has an insulating member formed with a through hole to the center of the body, an upper pattern formed on the upper surface of the insulating member formed of a conductive material capable of conducting electricity, and a lower surface of the insulating member. It consists of a lower pattern attached to a plate-like conductive material and an insulating layer attached to the lower part of the lower pattern to prevent shorting of the upper pattern and the lower pattern during soldering. A PC bit tact switch has been proposed in which an elastic contact portion electrically connected and disconnected while being sexually bent and in contact with a contact portion of a lower pattern is integrally formed.

However, the conventional PCT tact switch is composed of a unitary body with an elastic contact portion protruding from the upper surface of the upper pattern, or the elastic contact portion is formed on the upper surface of the upper pattern so that the overall thickness of the PCT tact switch is the height of the elastic contact portion, the thickness of the upper pattern, The thickness of the insulating member and the thickness of the lower pattern are added, and as a result, there is a problem in that it is impossible to provide an ultra-thin PC bit tact switch.

In addition, in the conventional PCT tact switch, since the elastic contact portion is formed on the upper surface of the upper pattern, the elastic contact portion elastically bends when clicked so that the elastic contact portion protrudes from the upper surface of the upper pattern so as to contact the contact portion of the lower pattern. There is a problem to move by the height, the thickness of the upper pattern and the thickness of the insulating member.

In addition, in order for the elastic contact portion to further move by the thickness of the upper pattern and the thickness of the insulating member, the user must apply an excessive force to the elastic contact portion, which shortens the life of the elastic contact portion.

In order to solve the above problems, an object of the present invention is to provide an improved tact switch which is easy to manufacture, can be surface mounted on a circuit board of an electronic product, and the thickness of the switch can be reduced.

In order to achieve the above object, an improved tact switch according to the present invention includes a first electrode plate having a through hole formed at a central portion thereof; A dome switch installed in the through hole of the first electrode plate and having a portion protruding from the through hole of the first electrode plate, and having a central portion convex so that the remaining portion is in electrical contact with the inner circumference of the through hole; The dome switch is installed on the inner circumference of the through hole of the first electrode plate to support the dome switch not to be out of the through hole of the first electrode plate. The dome switch is in close contact with the upper surface of the central portion of the dome switch. A plurality of protrusions to be electrically connected; It is installed under the first electrode plate and the dome switch to insulate the bottom surface of the first electrode plate and a portion of the bottom surface of the dome switch, when the dome switch is deformed by pressing a through hole through the central portion of the dome switch Formed insulation; And a second electrode plate provided below the insulating portion and in contact with the center portion of the dome switch that is deformed and energized with the first electrode plate.

In addition, the protrusion may be installed by forming an inclination in the upward direction of the first electrode plate to be in close contact with the upper surface of the central portion of the dome switch.

In addition, the dome switch is characterized in that the contact protrusion further formed on the bottom of the central portion.

In addition, the upper portion of the first electrode plate is characterized in that the film portion is further provided to cover and protect the upper surface of the first electrode plate and a portion of the upper surface of the dome switch.

As described above, the improved tact switch according to the present invention has an advantage that the size of the switch can be reduced in size and thickness by installing the dome switch in the through hole of the first electrode plate.

In addition, the improved tact switch according to the present invention has the advantage of improving the reliability of the product and the click feeling of the switch by minimizing the moving distance during elastic deformation of the dome switch.

In addition, the improved tact switch according to the present invention can be produced using the SMT has the advantage that the production time and cost can be significantly reduced.

In addition, the improved tact switch according to the present invention has an advantage that can be used regardless of the pattern change of the electronic circuit.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

(First embodiment)

Figure 2 is an exploded perspective view showing a first embodiment of the improved tact switch according to the present invention, Figure 3 is a cross-sectional view showing the assembly of the improved tact switch of FIG.

2 and 3, the improved tact switch 100 according to the present invention includes a first electrode plate 110 in which a pair of electrodes 112 are formed, and a first electrode plate 142 in which a pair of electrodes 142 are formed. A dome switch 120 installed between the second electrode plate 140 and the first and second electrode plates 110 and 140 to electrically connect or disconnect the first and second electrode plates 110 and 140. And an insulating part 130 that insulates the first and second electrode plates 110 and 140 from each other.

The first electrode plate 110 is a plate-shaped member, the through-hole is formed in the center portion, a plurality of protrusions 111 extending a predetermined length to the inside of the through-hole is formed, the electrode is symmetrical with each other around the through-hole 112 is formed.

In addition, the first electrode plate 110 is made of any one of a conductive metal material stainless steel or copper (copper), preferably made of a copper material and additionally plated coating using tin on the outer surface.

In addition, the protrusion 111 of the first electrode plate 110 may have a central portion of the dome switch 120 installed in the through hole of the first electrode plate 110 so as not to deviate from the center of the through hole of the first electrode plate 110. The position of the dome switch 120 is fixed, and the first electrode plate 110 and the dome switch 120 are in close contact with each other so that the contact surface in electrical contact can be further increased.

In addition, the protrusion 111 preferably has a predetermined inclination such that the first electrode plate 110 and the dome switch 120 may be in electrical contact with the outer surface of the protruding center portion of the dome switch 120.

The electrode 112 is formed to extend a predetermined length in the radial direction of the first electrode plate 110.

The dome switch 120 is a dome-shaped hemispherical member and is formed to protrude convexly in the upper portion thereof and is disposed in the through hole of the first electrode plate 110.

That is, since the dome switch 120 is disposed in the through hole of the first electrode plate 110 as a separate member from the first electrode plate 110, the thickness “T of the first electrode plate 110 indicated by a dotted line“ T ”is shown. By doing so, the position of the dome switch 120 is lowered, thereby reducing the thickness of the overall tact switch 100.

In addition, the dome switch 120 has a portion of the upper surface is installed in close contact with the protrusion 111 of the first electrode plate 110, and has a self-elasticity so that the pressing protrusion of the central protrusion is caused by the external pressing force Deformation occurs, and when the external pressing force is removed, the original dome shape is restored by the elastic force.

In addition, the dome switch 120 is made of stainless steel (SUS), which is a conductive metal material.

In addition, when the dome switch 120 forms at least one contact protrusion 121 on the bottom of the center part and the deformation of the dome switch 120 occurs, the center part of the dome switch 120 and the second electrode plate 140 are formed. This makes contacting easier.

That is, by minimizing the deformation of the dome switch 120, it is possible to improve the reliability of the dome switch 120 due to the deformation.

In addition, the thickness of the contact protrusion 121 is formed to be at least the same or thicker than the thickness of the insulation 130 so that the deformation of the dome switch 120 is minimized.

The insulating unit 130 is a rectangular insulating member and is installed under the dome switch 120 to insulate between the first electrode plate 110 and the second electrode plate 140.

In addition, the insulating part 130 is formed to have the same size as the first electrode plate 110, and a bottom surface of the first electrode plate 110 and a portion of the bottom surface of the dome switch 120 are formed with the second electrode plate 140. Prevents electrical conduction.

In addition, the insulating part 130 forms a through hole 131 through which the contact protrusion 121 formed at the center of the dome switch 120 and the bottom of the center part is pressed when the pressing force is generated by the dome switch 120. do.

In addition, the insulating part 130 forms the cutouts 132 at two corners of the four corners having a square shape facing each other, whereby the electrode of the first electrode plate 110 positioned on the top surface of the cutout 132 ( 112) is exposed as the contact terminal.

The second electrode plate 140 is a circular or square plate member, made of stainless steel or copper (copper), which is a conductive metal material, preferably made of copper, and in this embodiment, tin is applied to the outer surface of the copper. It is made of coated coating.

In addition, the second electrode plate 140 is installed under the insulating portion 130, and preferably has a smaller size than the insulating portion 130.

In addition, the center portion of the second electrode plate 140 is in contact with the center portion or the contact protrusion 121 of the press-deformed dome switch 120 is energized with the first electrode plate 110.

In addition, the second electrode plate 140 is symmetrical with respect to the center of the second electrode plate 140, and extends a predetermined length in the outward direction of the second electrode plate 140 to form the electrode 142.

In addition, the second electrode plate 140 is symmetrical with each other about the center of the second electrode plate 140, and a pair of cutouts 141 are formed to be orthogonal to the electrode 142.

The cutout 141 prevents the electrode 112 formed on the first electrode plate 110 from contacting the second electrode plate 140.

(Second embodiment)

Figure 4 is an exploded perspective view showing a second embodiment of the improved tact switch according to the present invention, Figure 5 is a cross-sectional view showing the assembly of the improved tact switch of FIG.

4 and 5, the improved tact switch 100 ′ according to the present invention includes a first electrode plate 110 ′ having a pair of electrodes 112 ′, and a pair of electrodes 142 ′. Is installed between the second electrode plate 140 'and the first and second electrode plates 110' and 140 'which are formed to electrically connect the first and second electrode plates 110' and 140 '. And an insulator 130 'to insulate between the dome switch 120' and the first and second electrode plates 110 'and 140'.

The first electrode plate 110 ′ is a plate member having a circular shape, and has a through hole formed at a central portion thereof, and a plurality of protrusions 111 ′ extending to a predetermined length inside the through hole are formed. The electrodes 112 'are formed symmetrically with each other.

In addition, the first electrode plate 110 ′ is made of one of stainless steel or copper (copper), which is a conductive metal, and is preferably made of copper and additionally has a plating coating using tin on an outer surface thereof.

In addition, the protrusion 111 ′ of the first electrode plate 110 ′ has a central portion of the dome switch 120 ′ installed in the through hole of the first electrode plate 110 ′ through the first electrode plate 110 ′. The position of the dome switch 120 'is fixed so as not to deviate from the center of the ball, and the first electrode plate 110' and the dome switch 120 'are brought into close contact with each other to further increase the contact surface.

In addition, the protrusion 111 ′ is preferably in close contact with the outer surface of the protruding center portion of the dome switch 120 ′ so that the first electrode plate 110 ′ and the dome switch 120 ′ may be electrically contacted. Have a slope.

The electrode 112 'is formed to extend a predetermined length in the radial direction of the first electrode plate 110'.

The dome switch 120 ′ is a dome-shaped hemispherical member and is formed to protrude convexly in the center portion thereof and is disposed in the through hole of the first electrode plate 110 ′.

In addition, the dome switch 120 'is a part of the upper surface is installed in close contact with the bottom surface of the first electrode plate 110', and has a self-elasticity so that the pressing protrusion of the central protrusion is caused by the external pressing force Deformation occurs, and when the external pressing force is removed, the original dome shape is restored by the elastic force.

In addition, the dome switch 120 'is made of stainless steel (SUS) which is a conductive metal material.

In addition, the dome switch 120 ′ forms a contact protrusion 121 ′ at the bottom of the center portion, and when the deformation occurs, the center portion of the dome switch 120 ′ and the second electrode plate 140 ′ may be more easily contacted. To help.

That is, by minimizing the deformation of the dome switch 120 ', it is possible to improve the reliability of the dome switch 120' due to the deformation.

In addition, the thickness of the contact protrusion 121 'is at least equal to or greater than the thickness of the insulation 130 so that deformation of the dome switch 120' is minimized.

On the other hand, in the present embodiment, the dome switch 120 'is configured to have a circular plate member to have a hemispherical shape, but as shown in Figs. It is also possible.

 The insulating part 130 ′ is a rectangular insulating member and is installed under the dome switch 120 ′ to insulate the first electrode plate 110 ′ from the second electrode plate 140 ′.

In addition, the insulating part 130 ′ is formed to have the same size as the first electrode plate 110 ′, and a bottom surface of the first electrode plate 110 ′ and a portion of the bottom surface of the dome switch 120 ′ are formed on the second electrode plate. Electrical conduction with 140 '.

In addition, the insulating part 130 ′ is a through hole through which the contact protrusion 121 ′ formed at the center of the dome switch 120 ′ and the bottom of the center part penetrates when the pressing force is generated by the dome switch 120 ′. 131 ').

In addition, the insulating part 130 ′ forms a cutout 132 ′ at two corners of the four corners of the quadrangular shape facing each other, such that the first electrode plate 110 ′ is positioned on the top surface of the cutout 132 ′. Electrode 112 'is exposed as a contact terminal.

The second electrode plate 140 ′ is a plate member having a circular or square shape, which is made of stainless steel or copper (copper), which is a conductive metal, and preferably made of copper. It is configured by plating coating using.

In addition, the second electrode plate 140 ′ is provided below the insulating portion 130 ′, and preferably has a smaller size than the insulating portion 130 ′.

In addition, the center portion of the second electrode plate 140 'is in contact with the center portion or the contact protrusion 121' of the press-deformed dome switch 120 'and is energized with the first electrode plate 110'.

In addition, the second electrode plate 140 'is symmetrical with each other about the center of the second electrode plate 140', and extends a predetermined length in the outward direction of the second electrode plate 140 'to extend the electrode 142'. Is formed.

In addition, the second electrode plate 140 'is symmetrical with each other about the center of the second electrode plate 140', and a pair of cutouts 141 'are formed to be orthogonal to the electrode 142'.

The cutout 141 prevents the electrode 112 'formed on the first electrode plate 110' from contacting the second electrode plate 140 '.

In addition, the present invention, when the tact switch 100 'is installed on the upper surface of the circuit board (not shown) is provided with an insulating portion 150' to allow the tact switch 100 'electrically insulated from the circuit board Is installed.

The insulator 150 'is configured to be insulated between the tact switch 100' and the substrate in a configuration processed by a rectangular insulating film or an insulation print.

In addition, the insulating portion 150 ′ is formed by cutting four corners by a predetermined length, so that the electrode 112 ′ of the first electrode plate 110 ′ and the electrode 142 ′ of the second electrode plate 140 ′ are formed. Allow exposure.

In addition, in the present invention, the protective film portion 160 ′ is installed on the upper portion of the first electrode plate 110 ′ so that impurities may be introduced to prevent malfunction and malfunction of the tact switch 100 ′.

The film portion 160 ′ is a rectangular film and covers the upper surface of the first electrode plate 110 ′ and a portion of the upper surface of the dome switch 120 ′ partially protruded through the through hole of the first electrode plate 110 ′. This prevents the inflow of impurities into the tact switch 100 'and protects the insulation function to be improved.

(Third embodiment)

8 is an exploded perspective view showing a third embodiment of the improved tact switch according to the present invention.

Referring to FIG. 8, the improved tact switch 100 ″ according to the present invention includes a first electrode plate 110 ″ and a second electrode plate 140 ″, and first and second electrode plates 110 ″ and 140 ″. ) And a dome switch 120 "to allow the first and second electrode plates 110" and 140 "to be electrically connected or disconnected, and the first and second electrode plates 110" and 140 ". And an insulator 130 " to insulate the gap therebetween.

The first electrode plate 110 ″ is a plate member having a rectangular shape, and a through hole is formed in a central portion thereof, and a plurality of protrusions 111 ″ extending a predetermined length into the inside of the through hole are formed.

In addition, the first electrode plate 110 ″ is made of a copper (copper) material, which is a conductive metal material, and preferably, a plating coating using tin is further formed on an outer surface.

In addition, the protrusion 111 "of the first electrode plate 110" has a central portion of the dome switch 120 "provided in the through hole of the first electrode plate 110" passing through the first electrode plate 110 ". The position of the dome switch 120 "is fixed so as not to deviate from the center of the ball, and the first electrode plate 110" and the dome switch 120 "are brought into close contact with each other to further increase the contact surface.

In addition, the protrusion 111 ″ is preferably in close contact with the outer surface of the protruding center portion of the dome switch 120 ″ so that the first electrode plate 110 ″ and the dome switch 120 ″ may be electrically contacted. Have a slope.

The dome switch 120 ″ is a dome-shaped hemispherical member, and the center portion is formed to protrude convexly upward, and is disposed in the through hole of the first electrode plate 110 ″.

In addition, the dome switch 120 "has a part of the upper surface in close contact with the bottom surface of the first electrode plate 110", and has a self-elasticity, so that the deformation of the dome switch 120 when the central protrusion is caused by pressing force caused by external force is deformed. This occurs, and when the external pressing force is removed, the original dome shape is restored by the elastic force.

The dome switch 120 " is made of stainless steel (SUS), which is a conductive metal material.

In addition, when the dome switch 120 "forms a contact protrusion 121 '(refer to FIG. 5) at the bottom of the center part and a pressing deformation occurs, the center part of the dome switch 120" and the second electrode plate 140 "are further formed. Make it easy to contact.

This configuration is such that the dome switch 120 ″ is installed at a position parallel to the first electrode plate 110 ″, so that the height of the protruding center portion of the dome switch 120 ″ when the dome switch 120 ″ presses and deforms due to pressure is applied. If only the distance of the thickness of the insulating portion 130 ″ is moved, the second electrode plate 140 ″ may be contacted, thereby reducing the distance that the dome switch 120 ″ moves.

On the other hand, in the present embodiment, the dome switch 120 ″ is configured to have a circular plate member to have a hemispherical shape. It is also possible.

 The insulator 130 ″ is a rectangular insulating member, and is installed under the dome switch 120 ″ to insulate the first electrode plate 110 ″ from the second electrode plate 140 ″.

In addition, the insulating portion 130 ″ is formed to have the same size as the first electrode plate 110 ″, and a bottom surface of the first electrode plate 110 ″ and a portion of the bottom surface of the dome switch 120 ″ are formed on the second electrode plate. Electrical conduction with 140 ".

In addition, the insulator 130 ″ penetrates the center portion of the dome switch 120 ″ and the contact protrusion 121 ′ (see FIG. 5) formed on the bottom surface of the center portion when the pressing force is generated by pressing the dome switch 120 ″. The through hole 131 "is formed.

In addition, the insulating portion 130 ″ forms the cutout 132 ″ at two corners of the four corners having a square shape facing each other, whereby the first electrode plate 110 ″ disposed on the upper surface of the cutout 132 ″. The edge of the) should be exposed as the contact terminal.

The second electrode plate 140 ″ is a rectangular plate member, which is made of stainless steel or copper (copper), which is a conductive metal material, preferably made of copper, and is plated using tin on the outer surface of the copper in this embodiment. It is constructed by coating.

In addition, the second electrode plate 140 ″ is provided below the insulation portion 130 ″, and preferably has a smaller size than the insulation portion 130 ″.

In addition, the center portion of the second electrode plate 140 ″ is in contact with the center portion or the contact protrusion 121 ′ (see FIG. 5) of the press-deformed dome switch 120 ″ and is energized with the first electrode plate 110 ″.

In addition, the second electrode plate 140 ″ forms cutouts 141 ″ at two corners of the four corners having a square shape facing each other, thereby remaining two uncut portions of the second electrode plate 140 ″. The edge of the to serve as a contact terminal of the second electrode plate 140 ".

In addition, in the present invention, when the tact switch 100 ″ is installed on an upper surface of a circuit board (not shown), an insulator 150 ′ is installed to allow the tact switch 100 ″ to be electrically insulated from the circuit board. do.

The insulator 150 ″ may be insulated from the tact switch 100 ″ and the substrate in a configuration processed by a rectangular insulating film or an insulation print.

In addition, the insulating part 150 ″ is formed by cutting four corners by a predetermined length so that the contact terminal of the first electrode plate 110 ″ and the contact terminal of the second electrode plate 140 ″ may be exposed.

In addition, the present invention installs a protective film portion 160 ″ on the upper portion of the first electrode plate 110 ″ to prevent impurities from flowing in and preventing malfunction and malfunction of the tact switch 100 ″.

The film portion 160 ″ is a rectangular film and covers a portion of the upper surface of the first electrode plate 110 ″ and a portion of the upper surface of the dome switch 120 ″ partially protruding through the through hole of the first electrode plate 110 ″. This prevents the inflow of impurities into the tact switch 100 "and protects the insulation function to be improved.

In addition, the film portion 160 ″ forms a pressing portion 161 so that the central portion may flow in a predetermined portion, thereby securing fluidity of the film portion 160 ″ according to the pressing deformation of the dome switch 120. 160 ") to prevent tearing.

Therefore, the improved tact switch 100 ″ according to the present invention does not require a separate printing operation or process for forming an electrode on a circuit board, but simply between the first and second electrode plates 110 ″ and 140 ″. By stacking sequentially so that the dome switch 120 "and the insulator 130" are installed, manufacturing becomes easy.

In addition, in the improved tact switch 100 ″ according to the present invention, the contact terminals of the first electrode plate 110 ″ and the contact terminals of the second electrode plate 140 ″ are disposed to face each other, so that the electrodes can be easily distinguished. Contact terminals are formed on the bottoms of the first and second electrode plates 110 ″ and 140 ″ to facilitate the surface mount technology (SMT) operation.

In the above, the present invention has been illustrated and described with respect to certain preferred embodiments. However, the present invention is not limited only to the above-described embodiments, and those skilled in the art to which the present invention pertains can vary as many without departing from the spirit of the technical idea of the present invention described in the claims below. Changes may be made.

1 is a perspective view showing a tact switch according to the prior art.

Figure 2 is an exploded perspective view showing a first embodiment of the improved tact switch according to the present invention.

3 is a cross-sectional view illustrating the improved tact switch of FIG.

Figure 4 is an exploded perspective view showing a second embodiment of the improved tact switch according to the present invention.

FIG. 5 is a cross-sectional view illustrating the improved tact switch of FIG. 4 assembled; FIG.

6 is a perspective view showing another embodiment of the dome switch shape.

7 is a perspective view showing another embodiment of the dome switch shape.

8 is an exploded perspective view showing a third embodiment of the improved tact switch according to the present invention;

(Symbols for the main parts of the drawing)

100, 100 ', 100 ": tact switch 110, 110', 110": first electrode plate

111, 111 ', 111 ": protrusions 112, 112', 142, 142 ': electrodes

120, 120 ', 120 ", 120a, 120b: dome switch

130, 130 ', 130 ": insulation 131, 131', 131": through hole

132, 132 ', 132 ": cutout 140, 140', 140": 2nd electrode plate

141, 141 ', 141 ": Incision 150', 150": Insulation

160 ', 160 ": film portion 161: pressing portion

Claims (4)

delete A first electrode plate having a through hole formed in a central portion thereof; A dome switch installed in the through hole of the first electrode plate and having a portion protruding from the through hole of the first electrode plate, and having a central portion convex so that the remaining portion is in electrical contact with the inner circumference of the through hole; The dome switch is installed on the inner circumference of the through hole of the first electrode plate to support the dome switch not to be out of the through hole of the first electrode plate. The dome switch is in close contact with the upper surface of the central portion of the dome switch. A plurality of protrusions to be electrically connected; It is installed under the first electrode plate and the dome switch to insulate the bottom surface of the first electrode plate and a portion of the bottom surface of the dome switch, when the dome switch is deformed by pressing a through hole through the central portion of the dome switch Formed insulation; And A second electrode plate provided below the insulator and in contact with the center portion of the dome switch that is deformed and energized with the first electrode plate; The protruding portion is an improved tact switch, characterized in that the inclined upward direction of the first electrode plate is installed in close contact with the upper surface of the central portion of the dome switch. The method of claim 2, The dome switch is an improved tact switch, characterized in that further forming a contact projection on the bottom of the central portion. The method of claim 2, The upper part of the first electrode plate is an improved tact switch, characterized in that the film portion is further provided to cover and protect the upper surface of the first electrode plate and a portion of the upper surface of the dome switch.

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