KR20090041922A - Manufacturing method of cellular phone keypad of concave mirror - Google Patents

Abstract

A method of manufacturing a concave mirror type keypad for a mobile phone is provided to form a character or a number on a button of metal material, thereby improving an image of the keypad. A concave surface is formed on one surface of each flat sheet of transparent plastic material(S100). An uninterruptible material layer is formed in a rear surface of the flat sheet(S200). A print layer printing a character or a number is formed on the rear surface of each uninterruptible material layer(S300). An opaque film is formed on a rear surface of the print layer so that the front of the flat sheet functions as a mirror due to the uninterruptible material layer. Adhesive is coated(S400). A silicon layer is formed(S500). The coated flat sheet is settled in a combining groove of each lower jig. An urethane film in which a silicon layer is formed is adhered closely to an upper jig. When the upper jig is compressed to the lower jig, each flat sheet is fused on the urethane film(S600).

Description

Manufacturing method of cellular phone keypad of concave mirror

The present invention relates to a method for manufacturing a concave mirror type keypad for a mobile phone, which is mounted on a mobile communication terminal (mobile phone) or a wired / wireless terminal to increase the appearance of the keypad for a mobile phone used as an input signal transmission means.

More specifically, letters or numbers can be formed on the buttons (keys) of the metal metal materials (referring to electrostatic materials such as Ni and Cr) to enhance the image of the keypads, thereby enhancing the appearance of the keypads. The present invention relates to a concave mirror keypad manufacturing method.

In general, a keypad is mounted on an information communication device such as a mobile phone, a personal digital assistant (PDA), a telephone, or an electronic device such as a remote controller or a keyboard and used to have a switching function for signal generation.

The keypad is manufactured by printing or spraying color ink on the upper surface of the silicon pad, and then imprinting letters using a laser and coating ultraviolet (UV) ink on the surface thereof.

Molded using a silicone pad or thermoplastic polyurethane (TPU) film, the upper surface of the keypad is plastic-injected, sprayed with color ink on its surface, then stamped with a laser and coated with ultraviolet (UV) ink on it. How you do it,

The use of metallic metal plates to enhance the image of the keypad,

Various methods of mounting a light emitting diode (LED) on a printed circuit board or stacking an electroluminescent (EL) sheet to use as a backlight light source of a keypad have been developed.

As shown in FIG. 1, a keypad for a mobile phone according to the related art includes a metal plate 2 forming a key input unit 6 by forming letters, numbers, or dividing lines into etching holes 1,

Urethane pad (3) is formed protruding letters, numbers or partition lines corresponding to the etching hole (1),

An electroluminescent sheet (4) which is responsible for the backlight function of the keypad,

And a dome switch sheet 5 which generates a switching signal through the PCB side contact according to the key input of the metal plate 2.

The key input unit 6 is formed by forming an engraved pattern such as a number, a letter, or a picture by stamping the metal plate member itself of the metal plate 2 by using etching (etching) or laser and marking engraving methods. Will be provided.

In the keypad manufacturing method of the prior art, since a pattern is formed by stamping on a metal plate, a silicon pad, or a urethane film, a troublesome and troublesome work process occurs, and the size of the key input side pattern is formed so small that the eyesight is improved. Bad users have the problem of being uncomfortable.

In addition, when the backlight light source is applied, the visibility of the backlight is poor.

In addition, since the metal metal plate is generally used such that nickel, chromium, and the like are disposed on the uppermost layer of the keypad, the metal material (Ni, etc.) comes into direct contact with the skin of the mobile phone user, thereby causing the human body such as a metal allergic reaction. There is a problem that can cause various harmful skin diseases.

Embodiment of the present invention, by forming a letter or number on the button (key) of the metal metal material (Ni, Cr) to enhance the image of the keypad, the metal metal inherent feeling and reflection mirror effect that doubles the luxury The present invention relates to a method of manufacturing a concave mirror type keypad for a mobile phone, so that the appearance beauty of the keypad can be increased.

Embodiment of the present invention relates to a method of manufacturing a concave mirror type keypad for a mobile phone to minimize the harm to the user's health by increasing the appearance of the keypad while reducing the amount of metal metal material mounted on the keypad.

The method for manufacturing a concave mirror keypad for a mobile phone according to an embodiment of the present invention includes a processing step of forming a concave surface on each surface of a flat sheet of transparent synthetic resin material;

A deposition process of forming an uninterruptible material layer on the back surface of each flat sheet;

A printing process of forming a printing layer for printing letters or numbers on the back surface of each of the uninterruptible material layers;

An application process of forming an opaque film on the back surface of the printing layer by a printing process so that the entire surface of the flat sheet sheet has a mirror function due to the uninterruptible material layer, and then applying an adhesive treatment;

A silicon adhesion process of forming a silicon layer after printing the silicone rubber to a fabric of the urethane film having a printing pattern corresponding to the shape of the flat sheet, respectively;

The flat sheet sheet coated by the coating process is seated in each of the coupling grooves of the lower jig, and the urethane film having the silicon layer formed is closely attached to the upper jig to fusion-fix each flat sheet to the urethane film when pressing the upper jig and the lower jig. Bonding process.

According to a preferred embodiment, any one of chromium, nickel, tin, aluminum, and indium is used as the non-interruptible material deposited on the back surface of the flat sheet.

As the above-described flat sheet, any one of ABS resin, acrylic resin, PC resin, PA resin, UV curing resin, PET, and tempered glass-based material is used.

As described above, the method of manufacturing a concave mirror type keypad for a mobile phone according to an embodiment of the present invention has the following advantages.

By forming letters or numbers on the buttons (keys) of metal metal materials (Ni, Cr, etc.) to enhance the image of the keypad, the metal metal's unique feeling and reflection mirror effect is doubled, thereby providing various layers of consumers. These needs can be met to improve the competitiveness of the product.

While minimizing the amount of metal used in the keypad, the appearance of the keypad can be increased to prevent harm to the user's health.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to describe in detail enough to enable those skilled in the art to easily practice the invention, and therefore It does not mean that the technical spirit and scope of the present invention is limited.

2 to 5, the method of manufacturing a concave mirror type keypad for a mobile phone according to an embodiment of the present invention, the concave surface 11 on one surface of each of the flat sheet of transparent synthetic resin material 10 that can transmit light ) Forming process (see S100),

A deposition process of forming an uninterruptible material layer 12 on each back surface of the flat sheet 10 (see S200),

A printing process (see S300) for forming a printing layer 13 for printing letters or numbers on the back surface of each of the uninterruptible material layers 12;

Due to the uninterruptible material layer 12, the printed layer by the printing process (see S300) to increase the appearance of the keypad due to the inherent feeling of metal, and the front surface of the flat sheet sheet 10 to perform a mirror function (see S300). 13) After the opaque film 14 is formed on the back surface, the coating layer 20 for applying an adhesive such as a primer (a mixture of known octane and acetone as a predetermined ratio and used as a surface modifier for an instant adhesive) is applied. Forming process (see S400) and

A silicon adhesion process (see S500) for forming a silicon layer 16 after printing the silicon rubber 16 on the fabric of the urethane film 15 on which the printing pattern is formed corresponding to the shape of the flat sheet 10, respectively;

The flat sheet sheet 10 coated by the coating process (see S400) is seated in each of the coupling grooves 19 of each of the lower jigs 17, and the urethane film 15 having the silicon layer 16 is formed thereon. 18) to bond the upper jig 18 and the lower jig 17 to the urethane film 15 by pressing and fixing each of the flat sheet sheets 10 to the urethane film 15 when the upper jig 18 and the lower jig 17 are pressed at a predetermined temperature (120 to 160 ° C.). S600).

At this time, the above-mentioned uninterruptible material (material which does not conduct current) deposited on the back surface of the flat sheet 10 is selected from among chromium (Cr), nickel (Ni), tin (Sn), aluminum (Al), and indium (In). Either can be used.

The above-described flat sheet 10 may be any one of ABS resin (acrylonitrile butadiene styrene), acrylic resin, PC resin (polycarbonate), PA resin, UV curing resin, PET, tempered glass-based material.

The urethane film 15 may be a polyurethane material having high elasticity, wear resistance, low temperature resistance, bending fatigue resistance, weather resistance, ozone resistance, aging resistance, and excellent flexibility.

Hereinafter, an example of the use of a method for manufacturing a concave mirror type keypad for a mobile phone according to an embodiment of the present invention will be described with reference to FIG. 2.

As described in S100, the concave surface 11 is formed on one surface of each of the flat sheet sheet 10 of transparent synthetic resin material through which light can pass. At this time, the concave surface 11 is formed of an acrylic resin material of a thin plate (for example, has a thickness of 0.4 mm), and is formed as a spherical or parabolic surface, so that precise cutting processing is required. It is preferred to be processed by.

That is, the first process of processing the depth into two stages of roughing (processing 0.15mm of 0.19mm depth) and finishing work (0.04mm depth) so that the concave surface 11 has a predetermined radius R17. It can work by secondary cutting which processes cutting (mirror surface processing) and the edge surface of the concave surface 11 which has predetermined radius R17 and depth (0.19mm).

As the flat sheet 10 described above, any one of ABS resin, acrylic resin, PC resin, PA resin, UV curing resin, PET, and tempered glass-based material may be used.

As described in S200, the uninterruptible material layer 12 is formed on the rear surface of each flat sheet 10 (referring to the bottom surface of the flat sheet 10) to a predetermined thickness (for example, 0.01 mm to 0.15 mm). To be deposited).

In this case, any one of chromium (Cr), nickel (Ni), tin (Sn), aluminum (Al), and indium (In) may be used as an uninterruptible material. Different colors (colors) can be varied depending on the material deposited on the flat sheet 10.

The edge of the flat sheet sheet 10 on which the uninterruptible material layer 12 is deposited is cut to fit the size of a keypad mounted on a mobile phone by using an end mill mounted on a machine such as a numerical control lathe (CNC). .

As described in S300, in order to display a control button (key) for controlling the operation of the terminal on the back surface of each of the uninterruptible material layer 12, a print layer which prints letters, numbers, and colors by a silk screen printing method ( 13).

At this time, the upper surface of the transparent flat sheet 10 can feel the luxurious appearance unique to the metallic, and at the same time can exhibit a reflection mirror effect.

As described in S400, the printing process (S300) to increase the appearance of the keypad due to the intrinsic feel of the metal due to the uninterruptible material layer 12, and the front surface of the flat sheet sheet 10 can exhibit a mirror function (S300). After forming the opaque film 14 on the back surface of the printing layer 13 by an adhesive), an adhesive such as a primer having excellent adhesion (a mixture of known octane and acetone in a predetermined ratio, and used as a surface modifier for an instant adhesive) Is applied to the back surface of the opaque film 14.

As described in S500, the silicon layer 16 is formed after the printing process for the adhesion of silicone rubber to the fabric of the urethane film 15 in which the printing pattern of letters or numbers is formed to correspond to the shape of the flat sheet 10, respectively. .

At this time, the silicone rubber is vulcanized for 10-30 minutes at 35-45 ℃.

The urethane film 15, which has completed the vulcanization treatment process of silicone rubber, is cut by pressing or the like to fit the size of the keypad mounted on the mobile phone.

As described in S600, the urethane film in which the flat sheet 10 coated by the coating process (see S400) is seated in each of the coupling grooves 19 of each of the lower jigs 17, and the silicon layer 16 is formed ( 15) is brought into close contact with the upper jig 18, and when the upper jig 18 and the lower jig 17 are pressed under a predetermined temperature (range of 120 to 160 ° C), each of the flat sheet sheets 10 is urged to the urethane film 15. Fix fusion.

That is, as the air is sucked from the lower jig 17 connected to the vacuum pump (not shown), the urethane film 15 in close contact with the surface of the upper jig 18 is adsorbed toward the lower jig 17. The flat sheet 10 can be adhesively fixed to the urethane film 15 by the vacuum atmosphere and the high heat formed in the lower jig.

As described above, in the case of manufacturing a concave mirror type keypad for a mobile phone according to an embodiment of the present invention, various buttons (keys) for controlling the operation of the terminal by using a flat sheet material of an uninterruptible material from a metal metal material It can feel the luxury and at the same time reflecting mirror effect, it can meet the needs of consumers of various classes can enhance the competitiveness of the product.

1 is an exploded perspective view of a keypad for a mobile phone according to the prior art,

Figure 2 is a block diagram showing a method for manufacturing a concave mirror type keypad for a mobile phone according to an embodiment of the present invention.

3 is a schematic view of the upper and lower jig used in the method for manufacturing a concave mirror-type keypad for a mobile phone according to an embodiment of the present invention;

Figure 4 is a schematic diagram of a keypad manufactured by the method for manufacturing a concave mirror type keypad for a mobile phone according to an embodiment of the present invention,

5 is a schematic cross-sectional view of a keypad manufactured by the method for manufacturing a concave mirror-type keypad for a mobile phone according to an embodiment of the present invention.

* Explanation of symbols used in the main part of the drawing

10; Flat sheet

11; Concave

12; Uninterruptible Material Layer

13; Printed layer

14; Opaque membrane

15; Urethane film

16; Silicon layer

17; Lower jig

18; Upper jig

19; Combined groove

20; Coating layer

Claims (3)

Forming a concave surface on one surface of each of the flat sheet of transparent synthetic resin material; A deposition process of forming an uninterruptible material layer on each back surface of the flat sheet; A printing step of forming a printing layer on the back surface of each of the uninterruptible material layers for printing a letter or a number; A coating step of forming an opaque film on the back surface of the printing layer by the printing process so that the entire surface of the flat sheet has a mirror function due to the uninterruptible material layer, and then applying an adhesive; And A silicon adhesion process of forming a silicon layer after printing the silicon rubber to a fabric of the urethane film having a printing pattern corresponding to the shape of the flat sheet; And The flat sheet coated by the coating process is seated in each of the coupling grooves of the lower jig, and the urethane film having the silicon layer formed is closely attached to the upper jig. Method of manufacturing a concave mirror type keypad for a mobile phone, characterized in that it comprises a bonding process for fusion fixing. The method for manufacturing a concave mirror keypad for a mobile phone according to claim 1, wherein any one of chromium, nickel, tin, aluminum, and indium is used as the uninterruptible material deposited on the back surface of the flat sheet. The concave mirror keypad for a mobile phone according to claim 1 or 2, wherein the flat sheet is made of any one of ABS resin, acrylic resin, PC resin, PA resin, UV curing resin, PET, and tempered glass-based material. Manufacturing method.

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