KR20120041065A - Tact switch for electronic component - Google Patents

Abstract

The present invention relates to a tact switch for an electronic component, comprising: a pattern assembly in which an upper pattern and a lower pattern are electrically connected up and down with an insulating layer having a constant thickness therebetween to form a circuit pattern; And a metal dome mounted on the surface of the upper pattern to elastically bend and electrically connect when the electronic component button is clicked, wherein the center portion of the surface of the upper pattern is present between the empty space inside the metal dome and the upper pattern. By forming a collecting groove to collect dust or foreign matters that may occur during the click of an electronic part or by clicking a button of an electronic part, it is possible to prevent contact defects or shorts caused by foreign matters. By forming a protruding boss on the top of the assembly, that is, the top of the upper cover film covering the metal dome, when the button key of the electronic component is pressed, the contact with the metal dome is improved, so that the click rate and the click feeling can be improved.

Description

Tact Switch for Electronic Component {TACT SWITCH FOR ELECTRONIC COMPONENT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tact switch for electronic components capable of surface mounting on a circuit board, and more particularly, to a tact switch for electronic components having a structure for improving a button connection ratio of electronic components.

As is well known, the tact switch for electronic parts is a typical switch used in various electronic products for modernization because it performs the opening and closing operation of the circuit by light contact, and the opening and closing operation of the circuit is accurate, easy, and simple in structure. .

Recently, it is mainly used in portable communication devices such as cellular phones and miniaturized notebooks, portable cassettes, MP3s, etc., which are becoming more advanced and miniaturized. Tact switches are also small in weight, size and thickness. ), A tact switch is being developed.

An example of a conventionally developed tact switch is shown in detail in FIG. 1.

1 to 3 show a conventional tact switch, FIG. 1 is an exploded perspective view showing a configuration of a tact switch, FIG. 2 is a sectional view of a combination of a tact switch, and FIG. 3 is a combination showing a modified example of a tact switch. It is a cross section.

The conventional tact switch shown in FIGS. 1 to 3 is formed of an insulator which is not electrically conductive in a thin plate shape, and has an insulating member 100 having a through hole 110 formed in a central portion of the body, and an electrically conductive member. An upper pattern 200 formed on the upper surface of the insulating member 100, a lower pattern 300 attached to a lower surface of the insulating member 100 by a conductor capable of conducting electricity in a plate shape, and the lower pattern It is attached to the lower portion of the 300 is composed of an insulating layer 400 to prevent the short of the upper pattern 200 and the lower pattern 300 during soldering.

In addition, the body portion of the upper pattern 200 is integrally formed with an elastic contact portion 210 which is electrically connected and separated while contacting with the contact portion 310 of the lower pattern 300 while elastically bending when clicked, The elastic contact portion 210 is formed in a convex shape with a central convex, and the metal dome 500a, which is a dome-shaped elastic member 500, is positioned on the upper surface of the elastic contact portion 210 of the upper pattern 200 and the insulation film ( 600) is a fixed installation, through which it is possible to secure the expansion of the appearance and stable clickability and durability.

However, in the conventional tact switch, between the elastic contact portion 210 and the contact portion 310 of the lower pattern 300 which protrude convexly to the center of the body of the upper pattern 200, and the metal dome 500a and the upper portion. Since there is an empty space between the patterns 200, when the tact switch is clicked, the metal dome 500a presses the elastic contact portion 210 to be in contact with the contact portion 310 of the lower pattern 300 to be electrically connected and disconnected. There is a problem that a poor contact occurs or a short occurs due to the accumulation of foreign matter present or generated between the empty space inside the metal dome 500a and the lower pattern 300.

In addition, the above-described conventional tact switch has a convex elastic contact portion and a metal dome formed on the upper surface of the elastic contact portion, and when the electronic component button is pressed, the electronic component button connection rate is increased, and the click rate or click according to the tact switch is increased. There is a need for structural modifications that can improve the sense.

In addition, the structure of the above-described conventional switch products can shorten the life of the switch when the metal dome is pressed due to the step between the upper pattern and the lower pattern to shorten the switch life, thereby causing contact failure There was a problem.

The present invention has been created to solve the above-mentioned conventional problems, foreign matters by allowing foreign substances to be present or generated between the empty space inside the metal dome and the pattern assembly in the process of clicking an electronic component button. It is an object of the present invention to provide a tact switch for an electronic component that can prevent contact failure or short due to accumulation of chips.

In addition, an object of the present invention is to provide a tact switch for an electronic component, the operation of pressing the metal dome when the button key of the electronic component is pressed, the electronic component button connection rate is high, and the click rate or the click feeling according to the tact switch is further improved. The purpose is.

The present invention to achieve the above object,

A pattern assembly in which an upper pattern and a lower pattern are electrically connected up and down with an insulating layer having a constant thickness therebetween to form a circuit pattern; And a metal dome mounted on the surface of the upper pattern to elastically bend and electrically connect when the electronic component button is clicked.

The upper pattern has an insulating portion having a predetermined radius surrounding the central portion, and a first electrode portion and a second electrode portion having different polarities are formed inside and outside the insulating portion, and the lower pattern has an insulating portion formed across the lower pattern. First and second electrode parts are formed above and below the insulating part,

Through holes are drilled in the first and second electrode parts, respectively, and upper and lower patterns are electrically connected to the first and second electrode parts through the through holes, respectively.

The convex upper part of the metal dome covers the central portion of the surface of the upper pattern, and the circumferential end thereof is seated on the second electrode part positioned outside the insulator part. The present invention provides a tact switch for an electronic component, wherein the first electrode portion is in contact with the first electrode portion and is electrically connected to the first electrode portion.

In addition, according to the present invention, a collecting groove is formed in the center of the surface of the upper pattern so as to collect dust or foreign substances that existed between the empty space inside the metal dome and the upper pattern or may be generated during the button click process of the electronic component. ,

On the surface of the upper pattern, a dome guide having an insertion hole of a predetermined diameter perforated to accommodate the metal dome may be attached to the surface of the upper pattern to guide the installation of the metal dome and to prevent it from being detached or press-pressed to the center of the surface of the upper pattern. To form a groove shape to accommodate the metal dome,

The dome guide has one or more vent holes formed concave outwardly along the leading end of the insertion hole for smooth operation of the metal dome,

The upper pattern includes one or more vent holes that are concave outwardly along the circumferential end of the second electrode part for smooth operation of the metal dome.

The lower cover film is attached to the lower pattern surface, and the upper cover film is attached to the surface of the upper pattern on which the metal dome is mounted. Optionally, the top of the pattern assembly, that is, the upper part of the upper cover film covering the metal dome, has an electronic component button. A tact switch for an electronic component is provided which can form a protruding boss for a smooth pressing operation of the metal dome and an increase in a click rate or a click feeling when clicked.

The present invention having the basic configuration as described above can prevent contact failures or shorts caused by foreign matters, thereby increasing the electronic component button connection rate, and improving contact with the metal dome when the button key of the electronic component is pressed, thereby improving the click rate. And click feeling can be better.

In addition, the present invention is because the electrode is formed on the upper pattern and the surface of the metal dome and the upper pattern to maintain the correct flatness, it is possible to form a contact with an appropriate moving distance when pressing the metal dome, according to the switch life is a conventional problem Shortening and the resulting contact failure can be prevented.

1 is an exploded perspective view showing the configuration of a conventional tact switch for an electronic component;
FIG. 2 is a cross-sectional view illustrating a tact switch for an electronic component of FIG. 1; FIG.
3 is a cross-sectional view illustrating a modification of the tact switch for an electronic component of FIG. 1;
4 is an exploded perspective view of a tact switch for an electronic component according to the present invention;
5 is a plan view illustrating an upper pattern provided in the pattern assembly of FIG. 4;
6 is a bottom view illustrating a lower pattern provided in the pattern assembly of FIG. 4;
FIG. 7 is a bottom perspective view illustrating a coupling form of the pattern assembly and the lower insulating film of FIG. 4;
8 is an assembled cross-sectional view of a tact switch for an electronic component according to FIG. 4;
9 is an exploded perspective view showing another example of a tact switch for an electronic component of the present invention;
10 is an assembled cross-sectional view of a tact switch for an electronic component according to FIG. 9.

Hereinafter, a structure and a method of improving a click switch click rate improvement for an electronic component according to the present invention will be described with reference to the accompanying drawings.

4 is an exploded perspective view of a tact switch for an electronic component according to the present invention, FIG. 5 is a plan view showing an upper pattern provided in the pattern assembly of FIG. 4, and FIG. 6 shows a lower pattern provided in the pattern assembly of FIG. 4. FIG. 7 is a bottom perspective view illustrating a coupling form of the pattern assembly and lower insulating film of FIG. 4, and FIG. 8 is an assembled cross-sectional view of the tact switch for an electronic component according to FIG. 4.

As shown in FIGS. 4 to 8, the tact switch for an electronic component of the present invention includes a pattern assembly in which an upper pattern 10a and a lower pattern 10b are integrally formed with an insulating layer 10c of a constant thickness interposed therebetween ( 10). The upper pattern 10a has an insulating portion 11 having a predetermined radius surrounding the center portion, and the first electrode portion 12 and the second electrode portion 13 having different polarities in and out of the insulating portion 11. ) Is formed.

As shown in FIG. 6, the lower pattern 10b has an insulating portion 17 formed across the lower pattern 10b, and the first electrode portion 18 is disposed above and below the insulating portion 17. The second electrode portion 19 is formed.

4 to 6, through holes 15 and 16 are drilled in the first electrode portions 12 and 18 and the second electrode portions 13 and 19, respectively. The upper pattern 10a and the lower pattern 10b are electrically connected to the first electrode portions 12 and 18 and the second electrode portions 13 and 19, respectively, to form circuit patterns.

A collecting groove 14 may be formed at the center of the surface of the upper pattern 10a to collect the foreign matter that may be generated during the repeated click of the electronic component button. In particular, the collecting groove 14 is accumulated between the empty space inside the metal dome 40 and the upper pattern 10a to collect dust or foreign substances in the button click process of the electronic component. Prevents contact failure or short circuit caused by

According to FIG. 4, the metal dome 40 is mounted on the surface of the upper pattern 10a. The metal dome 40 is preferably designed such that its convex portion 41 covers the central portion of the surface of the upper pattern 10a and its circumferential end is seated on the second electrode portion 13 located outside the insulating portion 11. . As a result, when the electronic component button is clicked, the convex portion 41 elastically bends and contacts the first electrode portion 12 positioned inside the insulating portion 11, thereby causing the first electrode portion 12 and the second electrode portion to be contacted. (13) can be electrically connected.

In addition, a dome guide 30 is attached to a surface of the upper pattern 10a to guide the mounting of the metal dome 40 and prevent separation thereof. In FIG. 4, the dome guide 30 has an insertion hole 31 having a predetermined diameter perforated to accommodate the metal dome 40, and the dome guide 30 may be formed of a metal plate or film paper having a predetermined thickness. .

In addition, the dome guide 30 may include one or more vent holes 32 that are concave outwardly along the distal end of the insertion hole 31 for smooth operation of the metal dome 40. The vent hole 32 may temporarily receive air from the inside of the metal dome 40 when the metal dome 40 is pressed while the metal dome 40 is mounted on the upper pattern 10a. It enables a smooth pressing operation of the metal dome 40.

According to FIG. 4, the lower cover film 20 is attached to the lower pattern 10b positioned below the pattern assembly 10. In addition, the upper cover film 50 is attached to the upper pattern 10a positioned above the pattern assembly 10.

When the dome guide 30 including the lower cover film 20 and the upper cover film 50 is also made of a film material, it is preferable that these films are made of an electrically insulating material, such as a conventional PI film or PET film. Material can be used. In addition, in the case of the lower cover film 20 can be implemented through printing in place of course.

Meanwhile, in the lower pattern 10b to which the lower cover film 20 is attached, moisture or moisture penetrated by the through holes 15 and 16 is blocked to generate a waterproof effect, and the upper cover film 50 is attached to the lower pattern 10b. In the upper pattern 10a, a dustproof effect is generated in which foreign substances such as dust are blocked.

In addition, according to FIGS. 4 and 7, the lower cover film 20 has a shape in which four corners are cut out, and each of the lower cover films 20 is bonded to the surface of the lower pattern 10b as shown in FIG. 7. The first terminal portion 18e and the second terminal portion 19e to which the soldering lead is to be joined to the first electrode portion 18 and the second electrode portion 19 of the lower pattern 10b by the cutout portion 21 of FIG. Is formed.

As another example, at each corner of the surface of the lower pattern 10b, a film may be used to form solder terminals such as the first terminal portion 18e and the second terminal portion 19e, or a pattern may be formed by a printing method. Of course.

In the present invention, it is preferable that the upper pattern 10a and the lower pattern 10b use a plate member made of a metal or a nonmetal as a conductor.

Next, another embodiment of a tact switch for an electronic component according to the present invention will be described with reference to the drawings.

9 is an exploded perspective view showing another example of a tact switch for an electronic component of the present invention, and FIG. 10 is an assembled sectional view of the tact switch for an electronic component according to FIG. 9.

In the present embodiment, instead of removing the dome guide 30 attached to the surface of the upper pattern 10a as shown in FIG. 4, the pattern assembly 10 'is pressed by pressing the center portion of the surface of the upper pattern 10a'. The same effect as combining the upper pattern 10a and the dome guide 30 of FIG. 4 by constituting the same shape as the insertion hole 31 of the dome guide 30 and guiding the mounting of the metal dome 40 through it. It was configured to provide.

Also, in the present embodiment, the metal dome 40 has a second electrode portion 13 whose convex portion 41 covers the central portion of the surface of the upper pattern 10a 'and its circumferential end is located outside the insulating portion 11. It is installed so as to be seated on, the convex portion 41 is elastically bent when the electronic component button is clicked through the contact with the first electrode portion 12 located inside the insulating portion 11, the first electrode portion ( 12 and the second electrode 13 may be electrically connected to each other.

The upper pattern 10a ′ may include one or more vent holes 13a that are concave outwards along the circumferential end of the second electrode part 13 for smooth operation of the metal dome 40. have. The vent hole 13a may temporarily receive air from the inside of the metal dome 40 when the metal dome 40 is pressed while the metal dome 40 is mounted on the surface of the upper pattern 10a '. Can be made to enable a smooth pressing operation of the metal dome (40).

Of course, a collecting groove 14 for collecting dust or foreign matter may be formed in the central portion of the surface of the upper pattern 10a 'as shown in FIGS. 4 and 8.

After the metal dome 40 is mounted on the pattern assembly 10 ', the lower cover film 20 is attached to the surface of the lower pattern 10b, and the upper cover film 50 is attached to the surface of the upper pattern 10a'. Attached.

The lower cover film 20 has a shape in which four corners have cutouts 21 as shown in FIG. 4, and when the lower cover film 20 is bonded to the surface of the lower pattern 10b, each of the lower cover films 20 is as shown in FIG. 7. The cutouts 21 form first and second terminal portions 18e and 19e for soldering leads to the first and second electrode portions 18 and 19 of the lower pattern 10b, respectively. do.

In the present embodiment, the upper part of the metal dome 40, that is, the uppermost part of the pattern assembly 10 'on which the metal dome 40 is mounted, preferably the upper part of the upper pattern 10a' on which the metal dome 40 is mounted. Protruding boss 60 may be formed on the upper portion of the upper cover film 50 to cover.

The installation of the protruding boss 60 improves the contact between the metal dome and the 40 when the button key of the electronic component is pressed, thereby increasing the electronic component button connection rate and improving the click rate and the feeling of click.

Although not shown in the drawing, in the embodiment of FIG. 4, the protruding boss 60 is attached to the upper part of the upper cover film 50 covering the upper part of the metal dome 40, that is, the upper part of the upper pattern 10 a ′. Of course it can provide.

The tact switch for an electronic component of the present invention having the configuration as described above can prevent contact defects or short circuits caused by foreign matters, thereby increasing the electronic component button connection ratio, and when pressing a button key of the electronic component, Improves contactability and improves clickthrough rate and click feeling.

10,10 ': pattern assembly 10a, 10a': upper pattern
10b: lower pattern 10c: insulating layer
11,17 insulation part 12,18 first electrode part
13, 19: 2nd electrode part 13a, 32: vent hole
14: collecting groove 15,16: through hole
18e, 19e: terminal portion 20: lower cover film
21: incision 30: dome guide
31: insertion hole 40: metal dome
41: elastic portion 50: upper cover film
60: extrude boss

Claims (8)

As a tact switch for an electronic component,
A pattern assembly in which an upper pattern and a lower pattern are electrically connected up and down with an insulating layer having a constant thickness therebetween to form a circuit pattern; And
A tact switch for an electronic component, including a metal dome mounted on a surface of an upper pattern to elastically bend and electrically connect when an electronic component button is clicked. The method of claim 1,
The upper pattern has an insulating portion having a predetermined radius surrounding the center portion, and the first electrode portion and the second electrode portion having different polarities are formed inside and outside the insulating portion,
The lower pattern has an insulation portion formed across the lower pattern, and the first electrode portion and the second electrode portion are formed above and below the insulation portion.
Through holes are drilled in the first electrode portion and the second electrode portion, respectively, and upper and lower patterns are electrically connected to the first electrode portion and the second electrode portion, respectively, through the through holes. switch. The method of claim 2,
The metal dome has its convex upper part covering the center of the surface of the upper pattern, and its circumferential end is seated on the second electrode part located outside the insulating part. The tact switch for an electronic component, wherein the first electrode portion is in contact with the first electrode portion and is electrically connected to the first electrode portion. 4. The method according to any one of claims 1 to 3,
The tact for electronic parts is formed at the center of the upper surface of the upper pattern to collect dust or foreign substances that existed between the empty space inside the metal dome and the upper pattern or that may be generated during the button click process. switch. 4. The method according to claim 2 or 3,
On the surface of the upper pattern, a dome guide having an insertion hole of a predetermined diameter perforated to accommodate the metal dome may be attached to the surface of the upper pattern to guide the mounting of the metal dome and prevent detachment or press-press the center of the surface of the upper pattern. Tact switch for an electronic component, characterized in that to form a groove-shaped portion to accommodate the metal dome. 6. The method of claim 5,
The dome guide is a tact switch for an electronic component, characterized in that it comprises at least one vent hole concave outwardly along the leading end of the insertion hole for smooth operation of the metal dome. 6. The method of claim 5,
The upper pattern is a tact switch for an electronic component, characterized in that it comprises at least one vent hole concave outward along the peripheral end of the second electrode portion for smooth operation of the metal dome. 6. The method of claim 5,
The lower cover film is attached to the lower pattern surface, and the upper cover film is attached to the surface of the upper pattern on which the metal dome is mounted. Optionally, the top of the pattern assembly, that is, the upper part of the upper cover film covering the metal dome, has an electronic component button. Tact switch for electronic parts, which can form a protruding boss for smooth pressing operation of the metal dome and an increase in click rate or click feeling when clicked.

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