KR200275959Y1 - Structure of metal dome switch - Google Patents

Abstract

The present invention relates to a structure of a metal dome switch (METAL DOME SWITCH) that is used as a key switch for a mobile phone terminal, and more specifically, a heat resistance of a certain thickness coated with an adhesive on the upper and lower surfaces between the substrate and the metal dome fixing film. The insulating member is provided with a predetermined space between the lower end of the upper surface of the metal dome and the film for fixing the metal dome by the member after thermocompression bonding and thermal bonding, so that the clickability of the metal dome in the assembled state of the metal dome switch It is, of course, to provide a methyl dome switch that prevents the use of an insulating coating agent in the assembly of the metal dome switch, as well as preventing the reduction.

In order to achieve the above object, the present invention, in a general metal dome switch coated with an insulating coating, removes an insulating coating agent (not shown), and the metal dome 101 is disposed on the metal dome terminal pattern 106 of the substrate 102. (104, 104 ') is applied on the upper and lower surfaces between the metal dome fixing film 103 and the substrate 102 to protect and fix the metal dome 101 and then to the metal dome 101. And a solid member 105 having a constant thickness.

Description

Structure of Metal Dome Switch {STRUCTURE OF METAL DOME SWITCH}

The present invention relates to a structure of a key switch (KEY SWITCH) used in a mobile phone terminal, and more particularly, to a structure of a metal dome switch (METAL DOME SWITCH) generally used as a key switch for a mobile phone terminal. .

In general, the metal dome position is a frame including a switch terminal pattern, a metal dome disposed on the terminal pattern, a PET sheet covered on the metal dome, a metal dome and a Piti sheet are loaded and then fixed. The methyl dome switch manufactured as described above was assembled under the key of each key pad of the mobile phone terminal and functions as a key switch.

In the conventional metal dome switch structure, the terminal pattern is first manufactured, and the switch frame including the terminal pattern is individually molded into an insert mold, and then the metal dome and the PET sheet are formed on the terminal pattern of the frame. Is obtained by bending a metal cover on the switch frame and press-molding it separately, opening the metal dome part, and having a blade for bending the frame.

This conventional metal dome switch structure, first, when producing a metal dome position in the conventional metal dome switch structure has a problem that the productivity is significantly reduced.

Second, the metal dome switch produced by the conventional structure does not have a waterproof function, if the mobile phone terminal is flooded, it is directly connected to the failure of the terminal. Therefore, there is a need for a metal dome switch structure having a waterproof function.

Third, the metal dome position produced by the conventional structure is not dustproof.

Fourth, the metal dome switch produced by the conventional structure has a limit in reducing the thickness, there is a problem that difficult to obtain a shape suitable for automation when assembling the keypad.

In view of the above-described improvement of the conventional metal dome switch structure, I have filed an application for "Utility Registration No. 2001-0259931 (the structure of a metal dome switch)", and the metal dome of the "Utility Registration No. 2001-0259931". The structure of the switch " refers to an insulating coating agent coated on the substrate 1 after arranging a known metal dome 6 in a metal dome loading terminal pattern (not shown) of the substrate 1 as shown in FIG. 2) Applying the adhesive (3) on the top, and the metal dome fixing film (7) by covering the metal dome fixing film (7) in order to protect and fix the metal dome (6), the metal dome fixing film (7) As a result, the metal dome 6 was not moved forward, backward, left and right on the metal dome loading terminal pattern (not shown).

However, due to the thermocompression bonding, the metal dome fixing film 7 is pressed onto the upper surface of the metal dome 6 so that the CLICK property of the metal dome 6 fixed at the assembly position of the substrate 1 is increased. The pressing force of the fixing film 7 was significantly reduced than the clickability in the free state before assembly.

Therefore, such clickability reduction of the metal dome 6 is a problem that the switch operation function of the metal dome switch is reduced as a result.

Therefore, the present invention has been devised in view of such a problem, and has a predetermined thickness breakdown and an insulating member coated with an adhesive on the upper and lower surfaces between the substrate and the film for fixing the metal dome, and is formed by the member after thermal compression and thermal bonding. Since a certain space is formed between the lower end of the upper surface of the methyl dome and the film for fixing the metal dome, the metal dome can be prevented from being reduced in the assembled state of the metal dome switch. It is an object to provide a methyl dome switch that eliminates the use of an insulating coating agent in the assembly of the dome switch.

In order to achieve the above object, the present invention provides a structure of a general metal dome switch coated with an insulating coating agent (not shown).

After removing the insulation coating agent and placing the metal dome on the metal dome terminal pattern of the substrate, an electrodeposition agent is applied on the upper and lower surfaces between the covered metal dome fixing film and the substrate to protect and fix the metal dome. It is provided with a solid member of constant thickness which combines insulation.

1 is a front sectional view showing the structure of a typical metal dome switch.

2 is a perspective view of a metal dome switch according to the present invention.

3 is a cross-sectional view taken along line AA ′ of FIG. 2;

***** Detailed description of symbols for important parts of the drawings *****

101: metal dome 102: substrate

103: film for fixing the metal dome 104, 104 ': adhesive

105: solid member

Configurations and embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view of a metal dome switch according to the present invention, and FIG. 3 is a cross-sectional view taken along line AA ′ of FIG. 2.

The construction of the present invention is a general metal dome switch coated with an insulating coating agent (not shown),

Covering the metal dome fixing to protect and fix the metal dome 101 after disposing an insulating coating agent (not shown) and placing the metal dome 101 on the metal dome loading terminal pattern 106 of the substrate 102. Adhesives 104 and 104 'are applied between upper and lower surfaces of the film 103 and the substrate 102, and a solid member 105 having a constant thickness having both heat insulation and insulation properties is provided.

The present invention configured as described above, when the metal dome high performance film 103 is attached to the substrate 102 by thermocompression bonding and thermal bonding, adhesives 104 and 104 'applied to the upper and lower surfaces of the solid member 105 therebetween. Is warmed and softened, but the solid member 105 is not warmed or compressed.

Therefore, the space between the metal dome 101 and the metal dome fixing film 10, 1 by the thickness of the compressed adhesive (104, 104 ') and the solid member 105, in particular the thickness of the solid member 105 "B" is formed.

The spaced area “B” formed as described above minimizes the contact area of the metal dome fixing film 103 and at the same time minimizes the restraining force of the metal dome 101.

That is, the pressing force of the metal dome fixing film 103 acting downward from the upper surface of the metal dome 101 is minimized.

In addition, the solid member 101 may replace the role of an insulating coating agent coated on a conventional metal dome switch as an insulating member.

As described above, the present invention is provided with a solid member having a predetermined thickness with adhesive and coated on the upper and lower surfaces between the film for fixing the thermal dome and the metal dome and the substrate, and having insulation and heat resistance. Metal dome switch manufacturing process and product by eliminating the coating of insulation coating on the printed circuit board by improving the switch operation function of the metal dome switch by improving the cremeability of the metal dome compared to the desired "metal dome switch structure". There is an effect that the unit cost is reduced.

Claims (2)

In the structure of a general metal dome switch coated with an insulating coating agent, Without insulation coating (not shown), The metal dome fixing film 103 and the substrate 102 are disposed to protect and fix the metal dome 101 after the metal dome 101 is disposed on the metal dome stacking terminal pattern 106 of the substrate 102. The structure of the metal dome switch, characterized in that the adhesive member 104, 104 'is applied between the upper and lower surfaces, and the solid member 105 has a constant thickness that combines heat insulation and insulation. The method of claim 1, When the metal dome fixing film 103 is thermally compressed and adhered to the substrate 102, a predetermined space “B” is formed between the upper surface of the metal dome 101 and the metal dome fixing film 103. The metal dome switch structure characterized by the above.