KR100406937B1 - Tact switch form pcb printed circuit board - Google Patents

Abstract

The present invention relates to a PCB-type tact switch configured to reduce the size and shape of the light weight, and to prevent foreign substances and moisture from entering the interior, so that the present invention can be used in various applications such as advanced electronic devices and miniaturized devices.

According to a feature of the present invention, a terminal having a pair of a center contact portion and a variable contact portion is formed on the upper surface of the substrate, and the terminal is electrically connected to the center contact portion and the variable contact portion of the connection terminal on the bottom of the substrate, respectively. A metal contact for electrically connecting the center contact part and the variable contact part is seated on an additionally formed PCB, and an airtight cover made of an elastic rubber material having a push dome covering the metal contact is pressed at high temperature and high pressure on the upper surface of the PCB. There is provided a PCB type tact switch, which is configured to be integrally coupled.

Description

PCT Type Tact Switch {TACT SWITCH FORM PCB PRINTED CIRCUIT BOARD}

The present invention relates to a PCB-type tact switch, and more particularly, to reduce the size and shape of the light weight and to prevent foreign substances and moisture from entering into the interior to be applied to various electronic products, such as advanced and miniaturized It relates to a configured PC-type tact switch.

In general, the tact switch is a typical switch that is used for various electronic products, such as to perform the opening and closing operation of the circuit by light contact, the opening and closing operation of the circuit is accurate and easy, and the structure is simple, and in recent years, It is a trend that is increasingly used for electronic communication devices such as cellular communication such as cellular phones, various miniature notebooks, portable cassettes, etc., and according to the trend, the tact switch is also small in weight but small in size It is becoming.

In the conventional configuration of such a tact switch, as illustrated in FIGS. 1 and 2, an accommodating part 11a is formed inside the housing 11, and a center conductive plate ( 12 and the variable conductive plate 13 are formed, and the terminal 14 connected to the central conductive plate 12 and the variable conductive plate 13 is formed outside the housing 11. The dome-shaped metal contact 15 is inserted into the accommodating portion 11a of the 11, and the metal contact 15 is elastically inserted into the accommodating portion 11a of the housing 11 located above the metal contact 15. The stem 16 is pressed into the housing, and the upper surface of the housing 11 includes a metal plate 15 inserted into the housing 11a and a cover plate 17 for fixing the stem 16 to the housing. When the stem 16 is pressed and coupled to seal 11a, the metal contact 15 is elastically stretched, and the central conductive plate 12 and FIG side in contact with the top plate 13 is configured to be powered by being passed through between the terminal (14).

However, such a conventional tact switch 10 is configured to support the housing 11, the metal contact 15, the stem 16, and the stem, and at the same time seal the receiving portion 11a of the housing 11. It is composed of a cover plate (17), etc. There is a large number of parts and assembly process, the assembly work is not only troublesome, but also consists of a variety of parts to develop a tact switch 10 that becomes lighter and thinner as the size can no longer be reduced There was a problem that could not keep up with the trend.

The present invention has been proposed in view of the above problems, and provides a PCB-type tact switch configured to improve the reliability of the product by reducing the size and shape of the light weight and preventing foreign substances and moisture from entering into the inside. I would like to.

According to a feature of the present invention for achieving the above object, a connection terminal forming a pair of the center contact portion and the variable contact portion is formed on the upper surface of the substrate, and the center contact portion and the variable contact portion of the connection terminal on the bottom of the substrate A metal contact for electrically connecting the center contact portion and the variable contact portion is seated on a PCB having a terminal portion electrically connected to each other, and an airtight cover made of an elastic rubber material having a push dome covering the metal contact on an upper surface of the PCB. Provided is a PCB-type tact switch, which is configured to be integrally coupled with the PCB while pressing at a high temperature and high pressure.

1 is an exploded perspective view showing a conventional tact switch.

2 is a cross-sectional view showing a state in which a conventional tact switch is assembled;

Figure 3 is an exploded perspective view showing a PC-type tact switch according to an embodiment of the present invention.

Figure 4 is an exploded perspective view showing the PC-type tact switch of the present invention from another angle.

Figure 5 is a cross-sectional view showing an assembled state of the present inventors PCB-type tact switch.

Figures 6a and 6b is a perspective view and a cross-sectional view showing the step of manufacturing the PC-type tact switch of the present invention.

7A and 7B are exploded perspective and cross-sectional views showing a PCB-type tact switch according to another embodiment of the present invention.

8A and 8B are exploded perspective views illustrating a PCB-type tact switch according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: PC type tact switch

110: PC 111: substrate

111a: through hole 112: connection terminal

112a: center contact 112b: variable contact

112c: conductor 113: terminal portion

114: solid mask 115: support plate

115a: insertion hole 116: double-sided adhesive film

120: metal contact 130: airtight cover

131: push dome 132: stem

133: pressure projection

Hereinafter, the present invention will be described in detail with reference to the accompanying PC-type tact switch.

3 and 4 are exploded perspective views showing the PC-type tact switch according to an embodiment of the present invention, Figure 5 is a cross-sectional view showing the assembled state of the PC-type tact switch of the present invention, Figure 6 is a PC-type tact switch of the present invention Is a perspective view and a cross-sectional view showing the step of manufacturing.

As shown, in the PC-type tact switch 100 according to the embodiment of the present invention, a connection terminal 112 in which a center contact portion 112a and a variable contact portion 112b are formed on the upper surface of the substrate 111 is formed. In addition, the bottom of the substrate 111, the terminal portion 113 is electrically connected to the central contact portion 112a and the variable contact portion 112b of the connection terminal 112 is formed of the The dome-shaped metal contact 120 contacting and electrically connecting the central contact portion 112a and the variable contact portion 112b while being elastically curved at an upper side thereof is seated, and the metal is disposed on an upper surface of the PC 110. The sealing cover 130 made of an elastic rubber material having a pressing dome 131 covering the contact 120 is integrally coupled with the PC 110 while being pressed at a high temperature and high pressure.

The PCB 110 has a plate shape, and a through hole 111a is formed in each of a central portion and a peripheral portion of a rectangular substrate 111 that is non-conductive, and a center portion and a peripheral portion of the upper surface of the substrate 111 on which the through hole 111a is formed. The central contact portion 112a and the variable contact portion 112b, which are conductors, are partitioned and formed by forming concentric circles, respectively, and on both sides of the bottom surface of the substrate 111, the terminal portions 113 are formed with irregularities, respectively. The printed circuit board is formed on the substrate 111, and the center contact portion 112a, the one side terminal portion 113, the variable contact portion 112b and the other terminal portion 113 formed on the top and bottom surfaces of the substrate 111 are respectively formed on the substrate 111. In the process of printing the central contact portion 112a, the variable contact portion 112b, and the terminal portion 113 on the upper and lower surfaces of the conductors 112c, which are filled in the through-holes 111a, The non-conductive portion is formed at the portion except the bottom edge of the substrate 111. The solid mask 114 is formed to form the terminal portion 113 partially exposed.

As shown in FIGS. 7A and 7B, the rigid support plate 115 is inserted and coupled integrally between the PC 110 and the sealing cover 130, which are integrally coupled to the high temperature, and are integrally coupled. While controlling the thickness of the tact switch 100 and at the same time may be configured to prevent the PC-type tact switch 100 is bent or deformed, the metal contact 120 is inserted into the central portion of the support plate 115 Insertion hole 115a is formed through.

When the support plate 115 is inserted between the PC 110 and the airtight cover 130 to be integrally coupled, the airtight cover 130 and the support plate 115 are primarily operated at a high temperature and high pressure for efficiency of work. Compression is integrally coupled and then the support plate 115 and the PC 110 is preferably bonded by bonding the double-sided adhesive film 116 and integrally.

8A is an exploded perspective view illustrating a PCB-type tact switch 100 according to another embodiment of the present invention.

As shown, the PCB-type tact switch 100 according to another embodiment of the present invention has a connection terminal 112 in which a center contact portion 112a and a variable contact portion 112b are paired on an upper surface of the substrate 111. A plurality of PCs 110 formed on the bottom surface of the substrate 111 and having terminal portions 113 electrically connected to the central contact portion 112a and the variable contact portion 112b of the connection terminal 112, A plurality of metal contacts 120 electrically connected / blocked by elastic contact with the central contact portion 112a and the variable contact portion 112b of the connection terminal 112 formed on the upper surface of the PC 110; Covering the metal contact 120 is compressed to a high temperature and high pressure on the upper surface of the PC 110 110 is integrally coupled and consists of a closed cover 130 formed with a pressing dome 131 on a portion corresponding to the metal contact.

The central contact portion 112a and the variable contact portion 112b of the connection terminal 112 formed on the upper surface of the substrate 111 of the PC 110 are partitioned to form concentric circles, and the terminal portion 113 is connected to the connection portion 112. It is formed to correspond to the center contact portion 112a and the variable contact portion 112b of the terminal 112.

In addition, in some cases, the variable contact points of the connection terminals 112 formed on the upper surface of the PC 110 may be integrally formed and electrically connected as shown in FIG. 8B.

The substrate 111 and the sealing cover 130 are pressed at high pressure and high pressure by a mold, and the sealing cover 130 may be formed of a material such as synthetic resin, urethane, etc., which has desorption, in some cases.

In addition, the pressing dome 131 central portion of the sealing cover 130 is formed by the user's hand pressing the stem 132 is formed, the pressing portion 131 of the sealing cover 130 the inner surface of the central portion At least one pressing protrusion 133 for pressing the metal contact 120 is formed to effectively press the metal contact 120.

The action of the PC-type tact switch 100 of the present invention configured as described above is as follows.

Initially, the PCB-type tact switch 100 is in contact with only the variable contact portion 112b of the connection terminal 112 by the elastic force of the metal contact 120, so that the center contact portion 112a and the variable contact portion ( 112b) is not connected and is electrically 'off'.

Then, when the user presses the stem 132 protruding on the outer surface of the airtight cover 130, the pressure dome 131 of the airtight cover 130 is deformed deflectively and the inner surface of the pressure dome 131 of the airtight cover 130. The pressing protrusion 133 formed at the bottom is pressed down to press the center portion of the metal contact 120, and the metal contact 120 has the center portion unfolded downward by pressing the pressing protrusion 133, and the upper surface of the substrate 111. The PCB-type tact switch 100 is electrically 'on' by being connected while causing surface contact between the central contact portion 112a and the variable contact portion 112b of the connection terminal 112.

Thereafter, when the user releases the pressing force of pressing the pressing dome 131 of the airtight cover 130, the pressing dome 131 of the airtight cover 130 is restored by desorption and at the same time the central contact portion of the connection terminal 112 ( The metal contact 120, which has been in surface contact with the contact point 112a and the variable contact point 112b, is restored by the elastic force, so that the center portion of the metal contact 120 is separated from the center contact point 112a and falls off. ) Is electrically 'off'.

In this case, the substrate 111 and the airtight cover 130 are tightly coupled by high temperature and high pressure to be integrally coupled to the substrate 111 and the airtight cover 130 on which the metal contact 120 and the connection terminal 112 are formed. Since there is no fear that foreign matter or moisture may flow in between, it is possible to prevent the occurrence and failure of an electric signal due to the inflow of foreign matters, as well as to obtain a more reliable dustproof waterproof PC 100 type tact switch.

In addition, the present invention, the PCB type tact switch 100 is formed by printing molding the central contact portion 112a, the variable contact portion 112b and the terminal portion 113 of the conductor connection terminal 112 to a relatively thin substrate 111. It is possible to reduce the cost and price of the product by being able to manufacture a plurality of PC-type tact switch 100 at the same time in a single process, as well as lightweight and compact.

As described above, the PB-type tact switch of the present invention, because the PB and the press cover are pressed together at a high temperature, are integrally coupled to each other, so that foreign substances or moisture flow into the central contact and the variable contact that are electrically connected / blocked by the metal contact. There is no fear that the occurrence and failure of the electrical signal due to foreign matter and moisture can be prevented, it is possible to obtain a more reliable dustproof waterproof tact switch.

In addition, the PB-type tact switch of the present invention can be manufactured in a lightweight and compact type by using a PCB in which a central conductor, a variable conductor, and a terminal are printed and molded on a board, and simultaneously process a plurality of PB-type tact switches in a single process. Since mass production is possible, it is possible to reduce the cost of the product and provide a low-cost tact switch.

Although the embodiments of the present invention have been described so far, the present invention is not limited thereto, and various embodiments which can be modified and changed within the true spirit and scope of the principles described and claimed are included in the protection scope of the present invention. will be.

Claims (7)

A connection terminal 112 is formed on the upper surface of the substrate 111 to form a pair of the center contact portion 112a and the variable contact portion 112b, and a center contact point of the connection terminal 112 is formed on the bottom surface of the substrate 111. A metal contact for electrically connecting the central contact portion 112a and the variable contact portion 112b to the PC 110 having a terminal portion 113 electrically connected to the portion 112a and the variable contact portion 112b, respectively. 120 is seated on the upper surface of the PC 110, an elastic rubber sealing cover 130 having a pressing dome 131 covering the metal contact 120 is pressed at a high temperature and high pressure while the PC 110 and the In the PCB-type tact switch formed integrally coupled, the PCB 110 is a plate-like through-hole 111a is formed in the central portion and the peripheral portion of the non-conductive substrate 111, the through-hole 111a is formed The central contact portion 112a, which is a conductor, on the central portion and the peripheral portion of the upper surface of the substrate 111 The variable contact portion 112b is formed to form a concentric circle, and the terminal terminal 113 is formed on both sides of the bottom surface of the substrate 111 to form a concave-convex shape, and a center contact formed on the substrate 111 is formed. The portion 112a, the one side terminal portion 113, the variable contact portion 112b and the other terminal portion 113 form the center contact portion 112a, the variable contact portion 112b, and the terminal portion 113, respectively. In the process, the conductor 112c is electrically connected to the through hole 111a, and the non-conductive solid mask 114 is formed on the bottom surface of the substrate 111 so that the terminal portion 113 is partially exposed. PC type tact switch characterized in that the configuration. delete delete [2] The PCB-type tact switch according to claim 1, wherein the stem 132 protrudes from an outer surface of the push dome 131 of the airtight cover 130. [2] The PCB-type tact switch according to claim 1, wherein at least one pressing protrusion (133) pressing the metal contact (120) is formed on an inner surface of the pressing dome (131) of the sealing cover (130). The support plate 115 having an insertion hole 115a into which the metal contact 120 is inserted is integrally coupled between the PC 110 and the sealing cover 130, which are integrally coupled to each other. PC type tact switch characterized by the above-mentioned. delete