KR100502845B1 - Method for making of key pad and key pad made the same - Google Patents

Abstract

The present invention relates to a keypad manufacturing method and a keypad manufactured through the manufacturing method. Among them, the keypad manufacturing method includes a sheet preparation step of preparing a printing sheet having a predetermined printing pattern formed on one surface; A mold preparation step of preparing a predetermined injection mold corresponding to the printing pattern; An adhesive forming step of forming an adhesive on the other surface of the printing sheet; A sheet disposing step of disposing a surface on which the adhesive is formed at a corresponding position of the injection mold; An injection molding step of inserting a predetermined injection material into the injection mold so that the injection material and the printing sheet are integrally injected into the injection mold; It includes a finishing process of cutting and processing to a predetermined size by cooling after injection.

As a result, while overcoming the disadvantages of defects, a relatively large amount of production can be drawn with only a small amount of time and effort, thereby reducing the unit cost of the product and improving the value as a product.

Description

Keypad manufacturing method and keypad manufactured by the manufacturing method {METHOD FOR MAKING OF KEY PAD AND KEY PAD MADE THE SAME}

The present invention relates to a keypad manufacturing method and a keypad manufactured through the manufacturing method, and more particularly, to overcome the disadvantages of defects, but can lead to a relatively large amount of production with only a small amount of time and effort to reduce the unit cost of the product The value as a product relates to a keypad manufacturing method and a keypad manufactured through the manufacturing method which can be improved rather.

In general, when looking at electronic products or portable wireless terminals (including PCS phones and PDAs), a keypad is provided as a means for transmitting a predetermined input signal.

Existing keypads are usually produced by photographing at a time and printing a number plate or a letter on the corresponding keypad. The keypad 101a shown in FIG. 1A is printed on a general film to take a shot using a predetermined forming mold, and the keypad 101b shown in FIG. 1B is manufactured by printing a number plate or a letter board by color. .

Among them, in order to manufacture the conventional keypad 101b shown in FIG. 1B, first, the plastic material is put into a separate mold to make an intermediate injection molding of a desired size and shape.

The numbers or letters are then printed on the back side of the intermediate stage so that the numbers or letters appear three-dimensional when viewed from the front. In printing, a separate printing jig in which numbers or letters (hereinafter, referred to as "print patterns") are formed is used.

However, when the keypad is manufactured in this manner, the printing position of the printing jig for the intermediate injection molding must be adjusted one by one, and then a printing pattern must be formed on the intermediate injection molding using the printing jig. Therefore, not only it takes a lot of manufacturing time to manufacture the keypad, but also shows a disadvantage in that the productivity is lowered and the manufacturing cost increases.

In addition, in the case of the keypad 101a as shown in FIG. 1A, after forming the back screen on a transparent film and forming the raw material, the product has a disadvantage of a design without a sense of luxury and depth, and the keypad 101b as shown in FIG. 1B. In the case of expressing a sense of depth a little, but it causes problems such as productivity and defects by using a separate jig for each color.

It is an object of the present invention to provide a keypad manufacturing method and a method for manufacturing a keypad which can lead to a relatively large amount of production with only a small amount of time and effort while overcoming the disadvantages of defects, thereby reducing the unit cost of the product and improving the value as a product. It is to provide a keypad manufactured through.

Another object of the present invention can be applied to both relatively large or small varieties, keypads are manufactured through the manufacturing method and the manufacturing method so that it is possible to prevent discoloration and discoloration even if used for a long time to improve the value as a product To provide a keypad.

The object is the sheet preparation step of preparing a printing sheet having a predetermined printing pattern formed on one surface; A mold preparation step of preparing a predetermined injection mold corresponding to the printing pattern; An adhesive forming step of forming an adhesive on the other surface of the printing sheet; A sheet disposing step of disposing a surface on which the adhesive is formed at a corresponding position of the injection mold; An injection molding step of inserting a predetermined injection material into the injection mold such that the injection material and the printing sheet are integrally injected into the injection mold; It is achieved by a keypad manufacturing method, including a finishing step of cutting and processing to a predetermined size by cooling after injection.

Here, the adhesive forming step may be performed integrally in the sheet preparation step or separately after the sheet preparation step.

The printing pattern is formed on the rear surface of the printing sheet, and the adhesive is formed on the front surface of the printing sheet.

The sheet preparation step, the fabric preparation step of preparing a transparent adhesive printing fabric; A printing step of printing a plurality of the printing patterns on the prepared adhesive printing fabric; And a unit area cutting step of cutting the adhesive printing fabric into a predetermined unit area.

The injection material may be a transparent or translucent material as any one of plastic, rubber, and metal including any one of ABS, acrylic, and PC.

On the other hand, the object, the fabric preparation step of preparing a transparent adhesive printing fabric; A forming part forming step of partially bending the prepared adhesive printing fabric to form a forming part; A material filling step of filling a material of the transparent plastic with the forming part; It is also achieved by a keypad manufacturing method, characterized in that it comprises a printing step of directly printing the printing pattern on the back of the adhesive printing fabric and the transparent material.

Here, after the material filling step, it may further include an insert printing sheet arrangement step of further placing any one of an additional printing sheet or a print transfer film on the back of the adhesive printing material and the transparent material.

On the other hand, the said object is also achieved by the keypad manufactured by the manufacturing method of any one of Claims 1-5.

The above object is also achieved by a keypad manufactured by the manufacturing method of any one of claims 6 and 7.

Hereinafter, with reference to the accompanying drawings will be described in detail for each embodiment of the present invention.

First embodiment

2 is a diagram of a keypad 1 as an example that may be employed in a portable wireless terminal that is actively used in the near field. Referring to this figure, the keypad 1 is provided with numerals, letters, and figures (collectively referred to as a print pattern P) for forming a plurality of input buttons. Such a keypad 1 is described in the following method. Is prepared by.

3 is a flowchart illustrating a method of manufacturing the keypad of FIG. 2, and FIGS. 4A to 4D are schematic diagrams corresponding to FIG. 3, respectively.

Referring to these drawings, the keypad manufacturing method according to the present invention corresponds to a sheet preparation step S11 for preparing a printing sheet 10 having a predetermined printing pattern P formed on one surface thereof, and a printing pattern P. FIG. The mold preparation step (S12) for preparing a predetermined injection mold 20, the adhesive forming step of forming the adhesive 12 on the other surface of the printing sheet 10, and the surface on which the adhesive 12 is formed injection mold ( The sheet disposition step (S13) disposed at the corresponding position of 20) and the predetermined injection material 14 is introduced into the injection mold 20, and the injection material 14 and the printing sheet 10 in the injection mold 20. The injection molding step (S14) to be integrally injected, and the finishing processing step (S15) for cutting and processing to a predetermined size by cooling after injection.

The printing pattern P is formed on the rear surface of the printing sheet 10, and the adhesive 12 is formed on the front surface of the printing sheet 10. At this time, if the printing sheet 10 itself is in the form of a sticker, the adhesive is applied to one surface thereof, may be excluded from the adhesive coating step in the process. In this case, when the printing sheet 10 is prepared, merely removing the cover of one side may provide the same effect as the coating effect of the adhesive 12, which may exist between steps S11b and S11d in FIG. 3.

However, if the printing sheet 10 is not in the form of a sticker, the adhesive 12 should be applied to the printing sheet 10 after the sheet preparation step S11. At this time, the printing pattern P is formed on the rear surface of the printing sheet 10 and the adhesive 12 is formed on the front surface of the printing sheet 10 (see enlarged portion of FIG. 4B).

The injection material 14 may be a transparent or translucent material made of any one of plastic, rubber, and metal including any one of ABS, acrylic, and PC. This injection material 14 is filled in the injection mold 20 and solidified before injection.

Then, the keypad manufacturing method will be described in detail with reference to FIGS. 4A to 4C including FIG. 3.

First, the printing sheet 10 is prepared (S11). At this time, as shown in Fig. 4A, a large adhesive printing material 8 serving as a material of the printing sheet 10 is prepared (S11a). Then, the printing pattern P is printed on the back surface of the adhesive printing fabric 8 (S11b). In printing, ordinary screen printing may be used, but offset printing or the like may be applied for mass production.

The adhesive 12 is applied to the entire surface of the printing sheet 10 (S11c). The adhesive 12 may be employed as a so-called hot-melt system. As described above, if the printing sheet 10 itself is applied as an adhesive on one surface thereof in the form of a sticker, except for the step of applying the adhesive. You may have to. In this case, when the printing sheet 10 is prepared, the same effect as that of the application of the adhesive 12 may be provided by only removing the cover of one surface. If not, the adhesive 12 is applied to the entire surface of the printing sheet 10 to prepare.

Next, after printing so that a plurality of printing patterns P are formed on the adhesive printing fabric 8, the adhesive printing fabric 8 is cut into a predetermined unit area to fit the size of the injection mold 20 (S11d). . The state in which the adhesive printing fabric 8 is cut into a predetermined unit area (dashed line in FIG. 4A) is referred to as a pre-injection printing sheet 10.

3 and 4a, when the preparation of the printing sheet 10 is completed, as shown in FIG. 4b, an injection mold 20 is prepared separately from the printing sheet 10 (S12). The injection mold 20 is a means for insert injection molding the printing sheet 10 and the injection material 14 integrally, and the injection mold 20 has an uneven surface corresponding to the printing pattern P of the printing sheet 10. 20a) should be formed.

When the preparation of the printing sheet 10 and the injection mold 20 is completed, as shown in FIG. 4B, the printing sheet 10 is placed into the injection mold 20. The printing sheet 10 has a surface on which the adhesive 12 is formed to face the uneven surface 20a of the injection mold 20. Then, the injection mold 20 is disposed above the printing sheet 10 (S13).

Then, the injection material 14 is injected into the injection mold 20 so that the injection material 14 and the printing sheet 10 are integrally injected in the injection mold 20 (S14). This is called insert injection. When insert injection starts in the injection mold 20, the material melts and is filled with the uneven surface 20a formed in the injection mold 20, and the adhesive 12 formed on the front surface of the printing sheet 10 is also rusted. It is integrated with the injection material.

When the insert injection is completed, after the printing sheet 10 solidifies the integrated material, it is taken out from the injection mold 20 and cut and processed to the smallest unit size that can be actually used (S15), as shown in FIG. 4C. Complete the keypad 1 (see FIG. 2).

When the keypad 1 is completed as shown in FIG. 4C, when the keypad 1 is viewed from the front of the keypad because the printing pattern P is formed on the rear surface of the printing sheet 10 instead of being located at the front of the keypad, a three-dimensional effect is observed. Including a depth effect can be produced.

As described above, when the keypad 1 is manufactured by the above method, a relatively large amount of production can be derived with only a little time and effort compared to the prior art, and thus the unit price is reduced compared to the conventional keypad 1b. The value as a benefit has the advantage.

In addition, it can be applied to both relatively large and small varieties, and even after prolonged use, discoloration and discoloration can be prevented, thereby improving the value as a product.

Second embodiment

5A is a view showing a second embodiment of the present invention. Referring to this figure, the keypad 1a may be manufactured as follows.

Referring to the foregoing technique, first, the general transparent film or the adhesive printing fabric 8 is prepared, and then the adhesive printing fabric 8 is partially bent to form the forming portion 8a.

In addition, the forming unit 8a is filled with a separate transparent material 9. Transparent material 9 is employed as a transparent plastic containing ABS, PC, acrylic and the like. Then, the above-described printing pattern P can be directly printed on the back of the adhesive printing material 8 and the transparent material 9.

If the keypad is manufactured by the method of the second embodiment, since the printing patterns of numbers or letters are located on the back of the forming unit 8a, when the keypad is viewed from the front, the design can be differentiated with a deeper effect. It has an effect.

Third embodiment

Figure 5b is a view showing a third embodiment of the present invention, after further bonding the separate print transfer film 15 to the back of the adhesive printing material 8 and the transparent material (9), the print pattern (P) Transferring to obtain the same effect as in the second embodiment.

If the keypads 1a and 1b are manufactured in the same manner as in the second and third embodiments, the beauty of the appearance becomes much more beautiful because the depth of the printing pattern P looks relatively deep. Therefore, the value as a product can be increased. As a result, when manufactured in the same manner as in Figures 5a and 5b, as well as productivity, there is an effect that can further give a sense of depth to the product.

Although the present invention has been described in detail with reference to the drawings, the present invention is not limited thereto.

In addition to the above-described embodiment, the print pattern may have various forms such as a picture, an image, a pattern, a logo, etc., apart from an advertisement such as a manufacturer's name.

As described above, according to the present invention, it is possible to derive a relatively large amount of production with only a small amount of time and effort while overcoming the disadvantages of defects, thereby reducing the unit cost of the product and improving the value as a product.

In addition, it can be applied to both relatively large and small varieties, there is an effect to improve the value as a product is prevented from discoloration and discoloration even after long-term use.

When the manufacturing method of FIGS. 5A and 5B is applied to the keypad, not only the design effect with a sense of depth, but also the productivity, as well as the limitations of existing keypads such as design expression can be overcome.

Figures 1a and 1b is a view showing a keypad manufactured by a conventional manufacturing method, respectively,

2 is a view of a keypad manufactured through the keypad manufacturing method according to the present invention;

3 is a flow chart for a method of manufacturing the keypad of FIG.

4A to 4C are schematic configuration diagrams corresponding to FIG. 3, respectively;

5a and 5b are views showing another embodiment of the present invention, respectively,

* Explanation of symbols for the main parts of the drawings

 1: Keypad 8: Adhesive Printing Fabric

10: printing sheet before injection 12: adhesive

14: injection molding 20: injection mold

Claims (9)

A sheet preparation step of preparing a printing sheet having a predetermined printing pattern formed on one surface thereof; A mold preparation step of preparing a predetermined injection mold corresponding to the printing pattern; An adhesive forming step of forming an adhesive on the other surface of the printing sheet; A sheet disposing step of disposing a surface on which the adhesive is formed at a corresponding position of the injection mold; An injection molding step of inserting a predetermined injection material into the injection mold so that the injection material and the printing sheet are integrally injected into the injection mold; A keypad manufacturing method comprising a finishing process of cutting and processing to a predetermined size by cooling after injection. The method of claim 1, The adhesive forming step is performed integrally in the sheet preparation step or after the sheet preparation step, characterized in that the keypad manufacturing method. The method of claim 1, The printing pattern is formed on the back of the printing sheet, the adhesive is characterized in that formed on the front of the printing sheet, the keypad manufacturing method. The method of claim 1, The sheet preparation step, Fabric preparation step of preparing a transparent adhesive printing fabric; A printing step of printing a plurality of the printing patterns on the prepared adhesive printing fabric; And a unit area cutting step of cutting the adhesive printing fabric into a predetermined unit area. The method of claim 1, The injection material is a keypad, any one of a plastic, rubber, metal including any one of ABS, acrylic and PC, characterized in that the transparent or translucent material, keypad manufacturing method. Fabric preparation step of preparing a transparent adhesive printing fabric; A forming part forming step of partially bending the prepared adhesive printing fabric to form a forming part; A material filling step of filling a material of the transparent plastic with the forming part; And a printing step of directly printing the print pattern on the back of the adhesive printing fabric and the transparent material. The method of claim 6, After the material filling step, further comprising the step of inserting the insert printing sheet to further arrange any one of an additional printing sheet or a printing transfer film on the back of the adhesive printing material and the transparent material, keypad manufacturing method. The keypad manufactured by the manufacturing method of any one of Claims 1-5. A keypad manufactured by the manufacturing method of claim 6.