KR20020023020A - Key pad assembly for portable radiotelephone - Google Patents

Abstract

PURPOSE: A keypad assembly for a portable wireless terminal is provided to previously prevent an interlocking operation of an adjacent other key button and prevent an error operation of a device by separately attaching key buttons on a supper side of a film sheet. CONSTITUTION: A plurality of contact point asperities(12) presses a plurality of metal domes(16) composed on a PCB(15). A button portion is formed on an upper portion of each contact asperity(12) by one body in a keypad lever(11). A thin film sheet(13) are attached on an upper side of the keypad lever(11). Key buttons(14) are separately attached on an upper side of each button portion of the thin film sheet(13).

Description

Keypad assembly for portable wireless terminal {KEY PAD ASSEMBLY FOR PORTABLE RADIOTELEPHONE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keypad assembly for a portable wireless terminal, and more particularly to a keypad assembly for a portable wireless terminal configured to include each individual key button so that the operation of the key button does not affect other adjacent key buttons.

Typically, a portable wireless terminal uses a keypad assembly or a touch screen as a key input means for inputting a number of the other party. In particular, the keypad assembly is a signal formed by grounding the carbon contact portion on the printed circuit board by pressing the metal dome mounted on the printed circuit board of the main body projections formed on the lower side of the keypad rubber formed with a plurality of key button unit, respectively We are using a way to apply.

At this time, since the keypad rubber of the keypad assembly is formed of a silicon material, a hard film sheet harder than the rubber is attached to the upper surface of the keypad rubber. At this time, the film sheet, like the keypad rubber, a plurality of button portion is formed integrally. Therefore, the keypad assembly including the keypad rubber and the film sheet is installed on the metal dome installed on the printed circuit board of the main body.

However, when the keypad assembly in which a plurality of button portions are integrally formed on the keypad rubber and the film sheet is applied as described above, when the pressing operation is performed on one key button, another adjacent key button is pressed, thereby causing malfunction of the device. The problem arises.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a keypad assembly of a portable wireless terminal configured to accurately operate only one key button during a pressing operation.

Another object of the present invention is to provide a keypad assembly of a portable wireless terminal having a separate key button, each of which is individually installed, so that the individual operations of the key button can be performed smoothly.

In order to achieve the above object, the present invention provides a keypad assembly of a portable wireless terminal,

A plurality of contact protrusions for pressing each of a plurality of metal domes provided on the printed circuit board of the main body, and a keypad rubber integrally formed on the upper portion of each of the contact protrusions;

A film sheet of thin film attached on the upper surface of the keypad rubber;

Characterized in that it consists of a hard key button respectively attached to the upper side of each button portion of the film sheet.

1 is a plan view of a portable wireless terminal to which the keypad assembly according to an embodiment of the present invention is applied.

2 is a partial cross-sectional view of FIG. 1 in accordance with a preferred embodiment of the present invention.

Figure 3 is a perspective view showing the adhesive surface of the key button according to an embodiment of the present invention.

<Description of Major Symbols in Drawing>

10: keypad assembly 11: keypad rubber

13: film sheet 14: key button

16: metal dome

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the case where it is determined that the gist of the present invention may be unnecessarily obscured, detailed description thereof will be omitted.

The keypad assembly according to the embodiment of the present invention is configured to prevent deformation after injection because it is not necessary to form a plurality of button holes when the main body frame is ejected.

1 is a plan view of a portable wireless terminal to which a keypad assembly according to an exemplary embodiment of the present invention is applied, the main body 110 consisting of an upper casing frame 111 and a lower casing frame (not shown), and the main It consists of a sub-body (not shown) installed to be opened and closed according to the user's selection on the body 110 and a hinge arm 160 for opening and closing the sub-body on the main body (110). Although not shown, the sub-body may be a flip cover or a folder that protects the keypad assembly and opens at a predetermined call angle.

An antenna device 130 is installed at one side of the top end of the main body 110. In addition, an ear piece portion 140 is positioned below the antenna device of the main body, and an LCD module 150 that is a display device is located below the ear piece portion 140. Is installed. The keypad assembly 10 and the microphone device 170 are sequentially located on the main body 110.

In this case, since the keypad assembly 10 is integrally formed, the edge portion of the keypad assembly 10 may be formed at the edge of the frame 111 without the need for forming holes for protruding a plurality of key buttons on the frame 111. It is good to adhere or fix on the inner surface.

FIG. 2 is a partial cross-sectional view of FIG. 1 according to a preferred embodiment of the present invention, in which a keypad rubber 11 made of silicon is installed on the upper casing frame 111. The keypad rubber 11 is integrally formed with a plurality of button portions having a predetermined interval and a contact protrusion 12 extending downward. The contact protrusion 12 is formed on a skirt portion formed to have a predetermined elasticity on the lower side of the button portion. In addition, a thin film sheet 13 is formed on the upper surface of the keypad rubber 11 so as to have the same shape as the upper surface of the keypad rubber 11 to prevent damage to the keypad rubber 11. do

Thereafter, hard key buttons 14 are attached to the upper side of each button portion of the film sheet 13, respectively. The key button 14 is formed of a plastic material, it is attached so that the interval between each key button 14 is in close contact with each other. At this time, each of the key button 14 may be adhered to the upper surface of the film sheet 13 by a predetermined bonding means.

In addition, each key button 14 is formed in a step shape having a first inclined surface and a second inclined surface formed in a direction opposite to the first inclined surface and at least wider than the first inclined surface, respectively. Pressing of the button is configured to perform smoothly.

In addition, a printed circuit board 15 having a predetermined pattern is mounted on the main body. As the metal dome 16 is attached to a position corresponding to the contact protrusion 12 of the keypad rubber 11, the printed circuit board ( It serves to ground the carbon contact of phase 15).

3 is a perspective view illustrating an adhesive surface of a key button according to an exemplary embodiment of the present invention, wherein the adhesive tape 17 is attached to the lower side of the key button 14, that is, the surface contacting the film sheet 13. And a double bonding structure for bonding the adhesive 18. As shown in FIG. 3, a double-sided adhesive tape 17 is adhered along an edge on the lower side of the key button 14. The center of the double-sided adhesive tape 17 is formed as an opening, the adhesive 18 is applied. Therefore, since the double-sided adhesive tape 17 and the adhesive 18 are simultaneously processed on the surface of the film sheet 13, more firm adhesion with the key button 14 can be performed. In addition, any one of the double-sided adhesive tape 17 and the adhesive 18 may be used as the said bonding means.

As described above, in the keypad assembly of the portable wireless terminal according to the embodiment of the present invention, since the key buttons are attached to the upper side of the film sheet, respectively, when the pressing operation is performed, the interlocking operation of other adjacent key buttons is prevented in advance. There is an effect that can prevent the operation of the malfunction.

Claims (5)

In the keypad assembly of a portable wireless terminal, A plurality of contact protrusions for pressing each of a plurality of metal domes provided on the printed circuit board of the main body, and a keypad rubber integrally formed on the upper portion of each of the contact protrusions; A film sheet of thin film attached on the upper surface of the keypad rubber; Keypad assembly of a portable wireless terminal, characterized in that consisting of a hard key button respectively attached to the upper side of each button portion of the film sheet. The method of claim 1, The key button is a keypad assembly of a portable wireless terminal, characterized in that the adhesive on the film sheet by a predetermined bonding means. The method of claim 1, The adhesive means includes a double-sided adhesive tape which is taped along an edge on the lower side of the key button and has an opening in the center thereof; Keypad assembly of a portable wireless terminal, characterized in that using the adhesive applied to the opening of the adhesive tape. The method of claim 1, Each key button is a keypad assembly of a portable wireless terminal, characterized in that formed of a plastic material. The method of claim 1, Each key button is a keypad assembly of a portable wireless terminal, characterized in that having a first inclined surface and a second inclined surface formed in a direction opposite to the first inclined surface and at least wider than the first inclined surface. .