KR20170079569A - Tact Switch on the Board - Google Patents

Tact Switch on the Board Download PDF

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Publication number
KR20170079569A
KR20170079569A KR1020150190289A KR20150190289A KR20170079569A KR 20170079569 A KR20170079569 A KR 20170079569A KR 1020150190289 A KR1020150190289 A KR 1020150190289A KR 20150190289 A KR20150190289 A KR 20150190289A KR 20170079569 A KR20170079569 A KR 20170079569A
Authority
KR
South Korea
Prior art keywords
housing
terminal
metal dome
exposed
insertion groove
Prior art date
Application number
KR1020150190289A
Other languages
Korean (ko)
Inventor
임종인
박윤규
박진우
홍승교
Original Assignee
협진커넥터(주)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 협진커넥터(주) filed Critical 협진커넥터(주)
Priority to KR1020150190289A priority Critical patent/KR20170079569A/en
Publication of KR20170079569A publication Critical patent/KR20170079569A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/04—Cases; Covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button

Abstract

The present invention relates to a surface mounting type tact switch, and more particularly, to a surface mount tact switch including a housing having an insertion groove formed at an upper portion thereof and an insertion groove formed at a lower depth of the insertion groove; A first terminal provided in the housing and having one end exposed to the outside of the housing and soldered to the surface of the substrate; A second terminal provided on the housing so as to be spaced apart from the first terminal and having one end exposed to the outside of the housing and soldered to the surface of the substrate; A metal dome provided in the insertion groove of the housing and connecting the first terminal and the second terminal when pressed; A stem installed on the metal dome and pressing the metal dome; And a cover film which is coupled to the upper surface of the housing and seals the insertion groove. The metal dome has a longer moving distance to improve the click feel.

Description

[0001] The present invention relates to a surface mount tact switch,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a surface mounting type tact switch, and more particularly, to a surface mounting type tact switch used in an electronic device such as a mobile communication terminal, an MP3 player, and a PDA.

The tact switch is installed on the board with a conductive metal dome having elasticity and is used to input electrical signals or open / close the electric power between the terminals connected by the metal dome by pressing and releasing the metal dome.

Such a tact switch is provided on a keypad substrate or a printed circuit board such as an MP3 player, a mobile communication terminal, a PDA, or the like, for communication and information processing electronic devices or the like, and repeats the electric signal or electric power between terminals repeatedly once or repeatedly when the user presses it .

The tact switch as described above is becoming more and more widespread. However, the tact switch thus far presented is not sufficiently bad when the metal dome is pressed, and the contact failure due to the soldering flux is often generated. Often occurs.

Korean Patent Publication No. 10-2010-0057745 (Application No.: 10-2008-0116538, entitled: Soldering flux free tact switch)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a surface mount type tact switch which is not only good in click feeling when pressed but also has improved bonding force with respect to a substrate.

According to an aspect of the present invention, there is provided a surface mount tact switch including: a housing having an insertion groove formed in an upper portion thereof and a recessed groove formed in a lower portion of the insertion groove; A first terminal provided in the housing and having one end exposed to the outside of the housing and soldered to the surface of the substrate; A second terminal provided on the housing so as to be spaced apart from the first terminal and having one end exposed to the outside of the housing and soldered to the surface of the substrate; A metal dome provided in the insertion groove of the housing and connecting the first terminal and the second terminal when pressed; A stem installed on the metal dome and pressing the metal dome; And a cover film coupled to an upper surface of the housing to seal the insertion groove.

Here, the housing has an inclined surface formed by chamfering the insertion groove inlet portion.

The first terminal is exposed to the outside of the housing and has a first exposed portion formed with a first solder inflow groove; A first connection part extending from the first exposed part to the inside of the housing and having a first leadfire delay groove; And a first contact portion extending from an end of the first connection portion and contacting the center of the bottom of the metal dome and having a flat portion contacting the metal dome.

Here, the first terminal may include a first lead inflow hole at a connection portion between the first exposed portion and the first connection portion.

The second terminal is exposed to the outside of the housing and has a second solder inflow groove formed therein; A second connection portion extending from the second exposed portion to the inside of the housing and having a second leadfire delay groove; And a second contact portion extending from an end of the second connection portion to be in contact with an end portion of the metal dome and having a flat portion contacting the metal dome.

Here, the second terminal is formed with a second lead inflow hole at a connection portion between the second exposed portion and the second connection portion.

The cover film is formed to have a width smaller than the width of the housing, and upper surfaces of both side ends of the housing are recessed downwardly so that the height of both side ends is lower than the other portions.

The surface mounted tact switch of the present invention configured as described above has an advantage that a click feeling can be improved by forming an additional groove below the insertion groove of the housing into which the metal dome is inserted to further increase the moving distance of the metal dome .

In addition, by forming the inclined surface by chamfering the entrance portion of the insertion groove of the housing, the metal dome can be easily inserted into the insertion groove, and the life of the cover film frequently touching the inclined surface can be extended.

In addition, since the first solder inflow groove and the second solder inflow groove are formed in the first exposed portion of the first terminal and the second exposed portion of the second terminal, the bonding force of the tact switch on the substrate can be improved .

In addition, since the width of the cover film is smaller than the width of the housing, edge portions of the cover film are positioned inside the housing without being exposed to the outside of the housing, thereby minimizing deformation of the cover film due to heat at the time of SMT.

The first and second leadframe delay grooves and the second leadframe delay groove are formed in the first connection portion of the first terminal and the second connection portion of the second terminal to delay the time for the flux to reach the first contact portion and the second contact portion, The problem of contact failure can be solved.

1 is a perspective view of a surface mounting type tact switch according to the present invention;
2 is an exploded perspective view of a surface mounting type tact switch according to the present invention;
3 and 4 are sectional views of a surface mount type tact switch according to the present invention.
5 is a view showing a first terminal and a second terminal of a surface mount type tact switch according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of surface mount tact switches according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a surface mounting type tact switch according to the present invention, and FIG. 2 is an exploded perspective view of a surface mounting type tact switch according to the present invention.

FIGS. 3 and 4 are sectional views of the surface mounting type tact switch according to the present invention, and FIG. 5 is a view showing the first terminal and the second terminal of the surface mounting type tact switch according to the present invention.

The surface mounted tact switch according to the present invention is mounted on a device such as a keypad substrate or a PCB substrate and includes a housing 100 and a first terminal 200 and a second terminal 300 provided in the housing 100, A metal dome 400 installed inside the housing 100, a stem 500 mounted on the metal dome 400, and a cover film 600 coupled to the upper surface of the housing 100 .

The housing 100 has a flat rectangular block shape made of a synthetic resin material such as polyamide. The housing 100 has an insertion groove 110 and a concave groove 120.

The insertion groove 110 is formed on the upper portion of the housing 100, and the metal dome 400 is installed in the insertion groove 110.

Meanwhile, the housing 100 has an inclined surface 111 formed by chamfering the entrance portion of the insertion groove 110.

When the inclined surface 111 is formed on the upper side of the insertion groove 110 in this way, the operation of inserting the metal dome 400 into the insertion groove 110 when assembling the tact switch is facilitated and the life of the cover film 600 is extended can do.

That is, when the entrance portion of the insertion groove 110 is formed by a chamfer to form a sharp perpendicular angle without forming the inclined surface 111, when the metal dome 400 is inserted into the insertion groove 110, The metal dome 400 is not easily inserted into the insertion groove 110 and the cover film 600 is continuously frictioned with the sharp entrance portion of the insertion groove 110 by the repeated pressing force. If you do, it will be easily damaged. In order to solve such a problem, according to the present invention, the inclined surface 111 is formed at the entrance of the insertion groove 110.

The concave groove 120 is formed at a predetermined depth below the insertion groove 110 to communicate with the insertion groove 110. Accordingly, when the user presses the metal dome 400 and the metal dome 400 is pushed downward, the central portion of the metal dome 400 is lowered to the concave groove 120 through the insertion groove 110, The feeling of going down further improves the sense of click.

Most of the first terminal 200 is inserted into the housing 100, and only one end of the first terminal 200 is exposed to the outside of the housing 100, and the exposed portion is soldered to the surface of the substrate 100.

The housing 100 according to the present invention is connected to the first terminal 200 and the second terminal 300 by an insert injection method. That is, the first terminal 200 and the second terminal 300, which are made of metal, are appropriately placed in the metal mold, and synthetic resin such as polyamide is injected into the metal mold to connect the first terminal 200 and the second terminal 300 Thereby making the combined housing 100. One end of the first terminal 200 and the second terminal 300 may be exposed to the outside of the housing 100 when the housing 100 is manufactured in this manner.

The first terminal 200 provided in the housing 100 may include a first exposed portion 210, a first connection portion 220 formed integrally with the first exposed portion 210, And a first contact portion 230 formed integrally with the connection portion 220.

The first exposed portion 210 is exposed to the outside of the housing 100 and the first exposed portion 210 is soldered to the surface of the substrate so that the tact switch of the present invention is firmly attached to the substrate. A first solder inflow groove 211 is formed in the first exposed portion 210.

The first solder inflow groove 211 is recessed inward from the outer periphery of the first exposed portion 210. When the first solder inflow groove 211 is filled with lead at the time of soldering, Thereby improving the bonding force.

The first connection part 220 extends from the first exposed part 210 to the inside of the housing 100. The first connection portion 220 has a first lead fake delay groove 221 formed therein.

The first lead yoke delay groove 221 is formed to delay the rise of the lead on the upper surface of the first terminal 200 during soldering. In the present invention, in order to solve such a problem, the first connection part 220 is formed with a 'U' shape inwardly recessed in the first connection part 220. In this case, 1 lead time delay groove 221 is formed to delay the time when the flux rides on the first terminal 200 and reaches the first contact portion 230.

The first terminal 200 has a first lead inlet hole 200a at a connection portion between the first exposed portion 210 and the first connection portion 220. [ As described above, the housing 100 is connected to the first terminal 200 and the second terminal 300 by an insert injection method. When the synthetic resin is injected into the mold, the synthetic resin is injected into the first lead inlet hole 200a So that the coupling force between the housing 100 and the first terminal 200 is strengthened.

The first contact portion 230 extends from an end of the first connection portion 220 and contacts the center of the bottom surface of the metal dome 400. The metal dome 400 is spaced apart from the center of the bottom of the metal dome 400 by a predetermined distance and is in contact with the bottom surface of the metal dome 400 when the metal dome 400 is moved downward.

The first contact portion 230 is formed so that the portion contacting the metal dome 400 is flat. Since the metal dome 400 continuously and repeatedly contacts the first contact portion 230, if the first contact portion 230 contacting the metal dome 400 is formed flat, the durability of the metal dome 400 is improved It is effective.

Like the first terminal 200, the second terminal 300 is inserted into the housing 100, and only one end of the second terminal 300 is exposed to the outside of the housing 100, Is soldered to the substrate. The second terminal 300 is spaced apart from the first terminal 200.

The second terminal 300 may include a second exposed portion 310, a second connection portion 320 formed integrally with the second exposed portion 310, and a second connection portion 320 formed integrally with the second connection portion 320. [ 2 contact portion 330 as shown in FIG.

The second exposed portion 310 is exposed to the outside of the housing 100 and the second exposed portion 310 is soldered to the surface of the substrate so that the tact switch of the present invention is firmly attached to the substrate. A second solder inflow groove 311 is formed in the second exposed portion 310.

The second solder inflow groove 311 is recessed inward from the outer periphery of the second exposed portion 310 and is filled with lead in the second solder inflow groove 311 during soldering, Thereby improving the bonding force.

The second connection part 320 extends from the second exposed part 310 to the inside of the housing 100. A second lead yoke delay groove 321 is formed in the second connection portion 320.

The second lead yoke delay groove 321 is formed in order to delay the rise of the lead on the upper surface of the second terminal 300 during soldering. In the present invention, in order to solve such a problem, the second connection part 320 is formed with a recessed " C " -shaped shape in the inside of the second connection part 320, 2 lead seam delay groove 321 is formed to delay the time for the flux to ride on the second terminal 300 and reach the second contact portion 330.

The second terminal 300 has a second lead inlet hole 300a formed at a connection portion between the second exposed portion 310 and the second connection portion 320. When the synthetic resin is injected into the mold by the insert injection method, the synthetic resin flows into the second lead inflow hole 300a and hardens, so that the coupling force between the housing 100 and the second terminal 300 becomes strong.

The second contact portion 330 extends from an end of the second connection portion 320 and contacts the end portion of the metal dome 400. The second contact portion 330 is always in contact with the bottom surface of the end portion of the metal dome 400.

The second contact portion 330 is formed so that the portion contacting the metal dome 400 is flat. Since the metal dome 400 always contacts the second contact portion 330, if the portion of the second contact portion 330 which is in contact with the metal dome 400 is formed flat, the durability of the metal dome 400 is improved have.

The metal dome 400 is manufactured in the form of a leaf spring having an elastic force and is installed inside the insertion groove 110 of the housing 100. When the metal dome 400 is pressed by an external force, the convex center portion of the metal dome 400 is lowered down to be in contact with the first terminal 200. Accordingly, the metal dome 400 functions to electrically connect the first terminal 200 and the second terminal 300.

The stem 500 is a kind of knob switch which is provided at the center of the metal dome 400 and presses the metal dome 400 when the stem 500 is pushed to lower the central portion of the metal dome 400 downward Goes.

The cover film 600 is joined to the upper surface of the housing 100 as a thin film. The cover film 600 seals the upper surface of the housing 100 opened by the insertion groove 110 while the metal dome 400 and the stem 500 are positioned below the cover film 600. therefore,

The width L1 of the cover film 600 is smaller than the width L2 of the housing 100. When the width of the cover film 600 is smaller, the end of the cover film 600 is not exposed to the outside of the housing 100 but is positioned inside the upper surface of the housing 100, so that the cover film 600 is deformed by heat generated during SMT Can be minimized.

100: housing 110: insertion groove
111: slope 120: concave groove
200: first terminal 200a: first lead inflow hole
210: first exposed portion 211: first solder inflow groove
220: first connection part 221: first lead firing delay groove
230: first contact portion 300: second terminal
300a: second lead inflow hole 310: second exposed portion
311: second solder inflow groove 320: second connection portion
321: second lead yoke delay groove 330: second contact portion
400: Metal Dome 500: Stem
600: Cover film

Claims (11)

A housing (100) having an insertion groove (110) formed in an upper portion thereof;
A first terminal 200 provided in the housing 100 and having one end exposed to the outside of the housing 100 and soldered to the surface of the substrate;
A second terminal 300 spaced apart from the first terminal 200 in the housing 100 and having one end exposed to the outside of the housing 100 and soldered to the surface of the substrate;
A metal dome 400 connecting the first terminal 200 and the second terminal 300 to the insertion groove 110 of the housing 100 when the first and second terminals 200 and 300 are pressed;
A stem 500 installed on the metal dome 400 to press the metal dome 400;
And a cover film 600 coupled to an upper surface of the housing 100 to seal the insertion groove 110,
Wherein the housing (100) is formed with a recessed groove (120) at a predetermined depth below the insertion groove (110).
The method according to claim 1,
Wherein the housing (100) has an inclined surface (111) formed by chamfering an inlet portion of the insertion groove (110).
The method according to claim 1,
The first terminal 200 includes a first exposed portion 210 exposed to the outside of the housing 100 and having a first solder inflow groove 211 formed therein;
A first connection part 220 extending from the first exposed part 210 to the inside of the housing 100;
And a first contact portion (230) extending from an end of the first connection portion (220) and contacting the center of the bottom surface of the metal dome (400).
The method of claim 3,
Wherein the first contact portion (230) is formed such that a portion contacting the metal dome (400) is flat.
The method of claim 3,
Wherein the first connection part (220) is formed with a first leadframe delay groove (221).
The method of claim 3,
Wherein the first terminal (200) is formed with a first lead inflow hole (200a) at a connection portion between the first exposed portion (210) and the first connection portion (220).
The method according to claim 1,
The second terminal 300 is exposed to the outside of the housing 100 and includes a second exposed portion 310 having a second solder inflow groove 311 formed therein;
A second connection part 320 extending from the second exposed part 310 to the inside of the housing 100;
And a second contact portion (330) extending from an end of the second connection portion (320) and contacting an end portion of the metal dome (400).
The method of claim 7,
Wherein the second contact portion (330) is formed such that a portion contacting the metal dome (400) is flat.
The method of claim 7,
And a second lead yoke delay groove (321) is formed in the second connection portion (320).
The method of claim 7,
Wherein the second terminal (300) is formed with a second lead inflow hole (300a) at a connection portion between the second exposed portion (310) and the second connection portion (320).
The method according to claim 1,
Wherein the cover film (600) has a width (L1) smaller than a width (L2) of the housing (100).
KR1020150190289A 2015-12-30 2015-12-30 Tact Switch on the Board KR20170079569A (en)

Priority Applications (1)

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KR1020150190289A KR20170079569A (en) 2015-12-30 2015-12-30 Tact Switch on the Board

Applications Claiming Priority (1)

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KR1020150190289A KR20170079569A (en) 2015-12-30 2015-12-30 Tact Switch on the Board

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KR20170079569A true KR20170079569A (en) 2017-07-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200051292A (en) * 2018-11-05 2020-05-13 주식회사 스위치코리아 Tactile switch and manufacturing method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200051292A (en) * 2018-11-05 2020-05-13 주식회사 스위치코리아 Tactile switch and manufacturing method thereof

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