KR20080018074A - Apparatus for forming keypad of mobile phone, and method of manufacturing the keypad using the same - Google Patents

Abstract

An apparatus for forming a keypad of a mobile phone and a method for manufacturing the keypad using the same are provided to reduce maintenance cost and to remove inefficiency of a roller type cast by replacing a stamper from a stamper installation roller. An apparatus for forming a keypad of a mobile phone includes a roller. A stamper(130) having a forming pattern to form an object is installed on the circumference of the roller. The formed object is a curable resin with fine protrusions by the forming pattern by being coated on an optical film. The forming pattern forms fine protrusion by contacting with the curable resin.

Description

Keypad Forming Apparatus for Mobile Terminal and Method for Manufacturing Keypad Using the Same {APPARATUS FOR FORMING KEYPAD OF MOBILE PHONE, AND METHOD OF MANUFACTURING THE KEYPAD USING THE SAME}

1 is a reference diagram for explaining a keypad for a mobile terminal according to the prior art.

Figure 2 is a perspective view showing a first embodiment of a keypad forming apparatus for a portable terminal according to the present invention.

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

Figure 4 is a reference diagram showing the separation of the stamper and the ultraviolet curable resin according to the first embodiment of the present invention.

5 is an exploded perspective view for explaining the configuration of the keypad forming apparatus according to the first embodiment of the present invention.

6 to 10 are reference views for explaining a series of methods for mounting a stamper according to a first embodiment of the present invention to a stamper mounting roller.

11 and 12 are reference views for explaining the deformation of the coupling member according to the first embodiment of the present invention.

13 is a flowchart of a keypad manufacturing method according to the first embodiment of the present invention.

14 is a flowchart for explaining a method for providing a stamper according to the first embodiment of the present invention.

15 is a schematic configuration diagram illustrating a keypad manufacturing method according to a first embodiment of the present invention.

16 is a schematic configuration diagram illustrating a method for manufacturing both sides of a keypad according to a first embodiment of the present invention.

17 is an exploded perspective view showing a modification of the keypad forming apparatus according to the first embodiment of the present invention.

18 is a perspective view showing a second embodiment of a keypad forming apparatus for a portable terminal according to the present invention;

19 is a cross-sectional view taken along line II ′ of FIG. 18;

20 is a reference view showing the separation of the forming roller and the ultraviolet curable resin according to the second embodiment of the present invention.

21 is a flowchart of a keypad manufacturing method according to a second embodiment of the present invention;

22 is a schematic diagram illustrating a keypad manufacturing method according to a second embodiment of the present invention.

Figure 23 is a schematic configuration diagram for explaining a method for manufacturing both sides of the keypad according to the second embodiment of the present invention.

24 is a perspective view showing a third embodiment of a keypad forming apparatus for a mobile terminal according to the present invention;

25 is an exploded perspective view for explaining the configuration of a keypad forming apparatus according to a third embodiment of the present invention;

Figure 26 is an exploded perspective view showing a modification of the keypad forming apparatus according to a third embodiment of the present invention.

27 is an exploded perspective view showing a fourth embodiment of a keypad forming apparatus for a mobile terminal according to the present invention;

Figure 28 is a side view showing a coupling form of the keypad forming apparatus according to the fourth embodiment of the present invention.

* Description of the symbols for the main parts of the drawings

100: stamper mounting roller mold 110: stamper mounting roller

110A: First roller 110B: Second roller

113A, 113B: restraint groove 120: coupling member

123: connecting portion 125A: restraining protrusion

130: stamper 140: coupling ring

412: narrow bone 413: wide bone

420: fitting member 421: narrow part

425: wide area

The present invention relates to a keypad forming apparatus and a keypad manufacturing method used in a portable terminal, and in particular, the maintenance of the maintenance cost is low while increasing the product yield per unit time by the roller-type mold which can be separated and replaced by a stamper A keypad forming apparatus and a keypad using the same, which can produce various keypads having different kinds of fine protrusions by simply replacing the stamper, and can form desired fine protrusions on both sides of the keypad in one process without complicated additional process. It relates to a manufacturing method.

Recently, the mobile terminal has provided the user with text information, image information, and games beyond the step of delivering only simple voice information due to the development of the technology. Accordingly, the portable terminal is an input means for transmitting an input signal to the embedded printed circuit board. The importance of keypad is also increasing day by day.

The keypad of the portable terminal is traditionally electrically connected to a substrate installed inside the portable terminal by making a plurality of key tops on which letters or figures are printed and a base supporting the lower portion while connecting them to each other.

However, in recent years, as the trend of ultra-slim slimming of the portable terminal is prominent, the front panel of the key top, the base, and the main body of the portable terminal 10 is manufactured as a keypad 11 of a structure integrated in one thin plate shape. So briefly look at the manufacturing method of the keypad according to the prior art as follows.

First of all, there was a method of manufacturing a keypad by injecting PMMA (poly methyl methacrylate) or PC (Polycarbonate), but the production method by injection molding has extremely low yield per unit time, and due to the characteristics of injection molding, There was a difficulty in forming a keypad having finely protruded letters or fine protrusions.

On the other hand, in the case of manufacturing a keypad using a stainless steel material, a method of manufacturing a desired shape using a pressurized press is used, but this has the advantage that the output per unit time is relatively high, while the price of the stainless steel material is expensive It is difficult to form and precise machining, and according to the shape of the keypad requires a large number of molds have the disadvantage that the production cost increases.

On the other hand, in the case of the keypad manufacturing method using ultraviolet curing, most of the fine projection directly on the plate-shaped die, or after mounting a stamper, a photocurable resin is applied thereon and the substrate film on the upper surface roller A press-type mold was produced, which was produced by ultraviolet curing while pressing. However, such a manufacturing method also has a low yield per unit time, it is difficult to mold the microstructure to a certain thickness, and may cause damage to the mold itself due to excessive load during pressing. In addition, the defect rate of the produced product was difficult and precise processing was difficult, due to the problem of the stamper UV curable resin flowed to the mold and the surroundings, it was necessary to remove the separate cured resin layer. Moreover, the production of other types of keypads had to be costly due to the fact that the mold itself had to be replaced.

Accordingly, the present invention has been proposed to solve the above conventional problems, and an object of the present invention is to provide a keypad-type keypad forming apparatus and a keypad manufacturing method using the same simply replace the stamper. .

It is also an object of the present invention to provide a keypad forming apparatus capable of reducing a defective rate of a product and forming precise fine protrusions, and a keypad manufacturing method having a double-sided structure using the same.

In addition, another object of the present invention is to provide a keypad forming apparatus for a mobile terminal and a keypad manufacturing method using the same, which can mold desired individual fine projections on both sides of the keypad in one process without complicated additional processes.

It is another object of the present invention to provide a separate core to which a stamper is coupled, and to provide a roller-type keypad forming apparatus which can simply mount and replace the core to a cylindrical roller to lower the defect rate and increase productivity in manufacturing a keypad. have.

In order to achieve the above object, the keypad forming apparatus for a mobile terminal according to the technical idea of the present invention is provided in a configuration including a roller mounted on an outer circumferential surface of a stamper having a molding pattern for molding a molded object.

In the present invention, the molded object is a curable resin that is applied to the optical film and the surface of the optical film to form fine projections by the molding pattern, and the keypad is obtained as a result. The molding pattern is formed in the width of the upper and lower light in the case of the embossed portion so as to facilitate separation from the curable resin after contact with the curable resin to form a fine projection, and the intaglio portion is formed in the width of the upper light lower narrow.

The above-mentioned stamper mounting roller is composed of a first roller and a second roller divided in the axial direction, and the first roller and the second roller are hinged to one end portion contacting the outer circumferential surface of the cut surface. It can be opened and retracted around a given axis.

In addition, the first roller and the second roller is further provided with a coupling member for engaging the other end portion opposite to the one side end of the hinge coupled in the retracted state, the outer peripheral surface of the other end portion of the first roller and the second roller Is formed in the form of a flat surface along the axial direction, and the coupling member has an outer portion having an outer surface that forms a curved surface with the same curvature together with the remaining outer peripheral surfaces of the first roller and the second roller while covering the flat surface. .

In addition, the first roller and the second roller has a concave groove recessed in the cutting surface thereof is formed along the axial direction, and the coupling member is fitted corresponding to the constrained groove to constrain the first roller and the second roller in a coupled state. And a connecting portion connecting the outer side and the restraining protrusion.

In the present invention, the coupling member is further provided with an annular coupling ring for pressing the outer wrap of the coupling member, the first roller and the second roller in a state in which the first roller and the second roller are coupled.

In the present invention, the stamper wraps around the first roller and the second roller, and both ends thereof are fixed to the other end portion opposite to the hinged one end portion of the first roller and the second roller. One end is fixed to the flat surface of the first roller and the other end is fixed to the flat surface of the second roller.

According to the present invention, the above-mentioned stamper mounting roller has a fitting bone formed along the axial direction by being recessed from the outer circumferential surface, and further includes a fitting member fitted to the fitting bone, wherein the stamper has an outer circumferential surface of the stamper mounting roller. While wrapping the both ends are bent inwardly is sandwiched between the fitting bone and the fitting member is fixed.

In the present invention, the stamper is provided with a plurality of molding patterns so that a plurality of results can be simultaneously formed from the shaped object in one rotation of the stamper mounting roller.

The present invention for achieving the above object is a method for manufacturing a keypad for a mobile terminal, comprising the steps of mounting a stamper formed with a molding pattern for forming a fine protrusion in close contact with the outer peripheral surface of the roller; Loading and transporting an optical film on the stamper mounting roller; Forming a fine protrusion by the molding pattern by applying an ultraviolet curable resin to the optical film; It provides a keypad manufacturing method comprising the step of curing the applied ultraviolet curable resin by irradiating ultraviolet light.

The present invention includes the steps of preparing a separate additional stamper mounting roller having a molding pattern different from the molding pattern of the stamper mounting roller; UV curable resin is applied to one side of the optical film and cured, and then the optical film is loaded and transferred to the additional stamper mounting roller; Applying an ultraviolet curable resin to the other side of the optical film; Curing the applied ultraviolet curable resin by irradiating ultraviolet rays to the other side of the optical film, characterized in that for molding both sides of the optical film.

Forming a molding pattern in the stamper mounting roller, the step of forming a sacrificial film by applying a material to be removed in the exposure to the roller outer peripheral surface in a flat state before the forming pattern is formed; Forming a photoresist layer by applying a first photosensitive agent and a second photosensitive agent, which are heterogeneous photoresists, which are developed by different developers on the sacrificial film formed on the outer circumferential surface; Placing a mask film on the photoresist layer and exposing the mask film to form a preliminary pattern for a molding pattern on the photoresist layer; Forming a metal layer on the photoresist layer on which the preliminary pattern is formed; Forming a body layer on the metal layer; And separating the body layer.

In the forming of the preliminary pattern, a prism shape, a retroreflective shape, a polygonal shape pattern, or the like may be formed by selectively using vertical exposure and oblique exposure.

In the present invention, the body layer is formed by electroplating using the metal layer as a seed layer, and a plurality of molding patterns are formed on the body layer so as to mold a plurality of keypads at one time.

The present invention further includes a step of forming a plurality of molding patterns on the stamper, and cutting the molded optical film with individual keypads.

In the present invention, the stamper mounting roller is bisected along the axial direction and one end portion of the cutting surface is hinged and consists of a first roller and a second roller that can be mutually opened and retracted, and the stamper is the stamper mounting roller. Mounting on the first roller and the second roller in a state in which both ends are fixed to the other end of the other end of the hinged opposite side of the first roller and the second roller, respectively, and then the first roller and the first roller It is achieved by gathering two rollers and then combining them so that they do not spread.

The optical film is made of polycarbonate (PC) or polyethylene terephthalate (PET), and the ultraviolet curable resin applied to the optical film is pressurized to fill the cavity of the optical film, and the ultraviolet curable resin has a microstructure. It is characterized in that it is a crosslinkable oligomeric resin containing hard and soft segments having a surface. In the present invention, the oligomer resin is preferably in the range of 1000 to 5000cps viscosity.

According to the present invention, the reflective layer is formed by vacuum deposition or sputtering on one side of the optical film in order to increase the reflectance by the fine protrusions and to impart various optical effects.

The present invention for achieving the above object, the core insertion groove is formed in the outer peripheral surface of the cylindrical roller formed; A stamper coupling core inserted into and seated in the core insertion recess; The present invention provides a keypad forming apparatus for a mobile terminal including a stamper which has a molding pattern for molding a molded object and is in close contact with the outer surface of the stamper coupling core.

In the present invention, the stamper coupling core is formed with the same curvature as the outer circumferential surface of the cylindrical roller, and has a flat square inner surface opposite to the outer surface, and is in contact with the inner surface perpendicularly. It has a circumferential surface connected to the side.

The cylindrical roller has a plurality of core insertion recesses, and the stamper is joined by welding to an outer surface of the stamper coupling core.

The present invention for achieving the above object, the core insertion groove is recessed in the outer peripheral surface and formed in a plurality of cylindrical rollers; It is inserted into the core insertion groove and seated, and a molding pattern for forming a molded object is formed on the outer surface, the outer surface is formed with the same curvature as the outer circumferential surface of the cylindrical roller, the inner of the flat square on the opposite side of the outer surface A core having a side surface, the core having a circumferential surface connected to the outer surface while being in direct contact with the inner surface; It provides a keypad forming apparatus for a portable terminal comprising a.

Provides a keypad forming apparatus for a mobile terminal further comprises an annular coupling ring for wrapping and pressing the cylindrical roller and the outer surface of the core inserted into the core insertion groove.

The present invention is characterized in that it is provided with a catch preventing groove formed deeper deeper in the corner of the core insertion groove so that the edge of the stamper coupling core is inserted into the core insertion groove.

Formation of the molding pattern in the present invention comprises the steps of: forming a sacrificial film by applying a material removed in exposure to the molding pattern formation surface in a flat state before the molding pattern is formed; Forming a photoresist layer by applying a first photosensitive agent and a second photosensitive agent, which are heterogeneous photoresists that are developed by different developer solutions, to the sacrificial film formed on the molding pattern forming surface; Placing a mask film on the photoresist layer and exposing the mask film to form a preliminary pattern for a molding pattern on the photoresist layer; Forming a metal layer on the photoresist layer on which the preliminary pattern is formed; Forming a body layer on the metal layer; It is made through the step of separating the body layer.

The keypad forming apparatus for a mobile terminal according to the technical idea of the present invention is provided in a configuration including a roller mounted on an outer circumferential surface of a stamper having a molding pattern for molding a molded object, and the stamper surrounds the outer circumferential surface of the roller. It is provided in close contact with it.

Hereinafter, exemplary embodiments of the present invention as described above will be described in detail with reference to the accompanying drawings.

Example 1

Figure 2 of the accompanying drawings is a perspective view of the keypad forming apparatus according to the present invention, Figure 3 is a sectional view taken along line II 'of Figure 2, Figure 4 shows a separation of the stamper and the UV-curable resin according to the invention 5 is an exploded perspective view for explaining the configuration of a keypad forming apparatus according to the present invention. However, in the accompanying drawings, the components of the stamper, such as the rotation axis of the mounting roller 110 is omitted.

As shown, the keypad forming apparatus according to the present invention has a stamper mounting roller mold 100 consisting of a stamper mounting roller 110 and a stamper (130, stamper) as a technical main part. Schematic configuration of the present invention looked at the center has a form in which the thin stamper 130 is mounted in close contact with the outer peripheral surfaces (111C, 111D) of the cylindrical stamper mounting roller 110, the cylindrical stamper mounting roller 110 consists of the first roller (110A) and the second roller (110B) divided in order to facilitate the mounting of the stamper (130) to enable the opening and closing. The configuration of the stamper mounting roller 110 and the stamper 130 in more detail as follows.

The stamper mounting roller 110 has a generally cylindrical shape, as described above, the first roller 110A and the second roller 110B bisected along the axial direction, and a coupling member 120 stably coupling them. It is made, including. The stamper mounting roller 110 is divided in the axial direction as if the cutting blade while moving along the axial direction to the blade standing up to match the diameter of the stamper mounting roller 110 in the form It means that the stamper mounting roller 110 is divided.

The first roller 110A and the second roller 110B of the stamper mounting roller 110 each have a form of a semi-circular column that becomes cylindrical when contacted with each other. The first roller 110A and the second roller 110B each have inner cutting surfaces 111A and 111B facing each other and outer peripheral surfaces 111C and 111D formed as curved surfaces, and the cutting surfaces 111A and 111B. ) And one of two boundary portions where the outer circumferential surfaces 111C and 111D meet each other are formed as flat flat surfaces 111E and 111F for coupling with the coupling member 120. The first roller 110A and the second roller 110B have a hinge coupling shaft 113 hinged between one end portions of the cutting surfaces 111A and 111B in contact with each other. As the first roller 110A and the second roller 110B rotate about the hinge coupling shaft 113, the first roller 110A and the second roller 110B may be widened or pinched between the other end portions opposite to each other. When the first roller 110A and the second roller 110B are opened about the hinge coupling shaft 113, the other end portion positioned on the opposite side of the hinge coupling shaft 1113 is as if the buds are wide open. The biggest thing happens. On the other hand, when the first roller 110A and the second roller 110B are retracted about the hinge coupling shaft 113, the other end portions are collected as if the buds were retracted. Then, the cylindrical shape is restored as a whole in a state where contact is made between the cutting surfaces 111A and 111B of the first roller 110A and the second roller 110B. Here, the hinge coupling shaft 113 of the first roller (110A) and the second roller (110B) is located inwardly from the outer peripheral surface (111C, 111D) of the roller (110A, 110B), for this purpose The interference preventing grooves 111G recessed in the outer circumferential surfaces 111C and 111D of the first roller 110A and the second roller 110B are formed long along the axial direction, and the hinge coupling shaft 113 is installed therein.

The first roller 110A and the second roller 110B have constrained grooves 113A and 113B recessed in a rectangular shape on the outer circumferential surfaces 111C and 111D along the axial direction. As a result, when the first and second rollers 110A and 110B are collected and coupled together, the constraining protrusion 125A of the coupling member 120 is simultaneously fitted into the constraining grooves 113A and 113B. The roller 110A and the second roller 110B are restrained from being opened in a coupled state. In addition, when the constraining protrusion 125A of the coupling member 120 is fitted into the constraining grooves 113A and 113B, the remaining part of the coupling member 120 is more stably supported without shaking, and thus, the first roller 110A. And the second roller 110B are good to maintain the combined state.

The coupling member 120 serves to couple the divided first roller 110A and the second roller 110B, and for this purpose, the outer portion 121, the connecting portion 123, and the restraining portion 125 are provided. It is made in one piece. The outer side 121 of the coupling member 120 fills and covers the flat surfaces 111E and 111F of the first roller 110A and the second roller 110B and covers the first roller 110A and the second roller ( It is coupled to 110B at the same time serves to bind the first roller (110A) and the second roller (110B). The outer side portion 121 of the coupling member 120 fills a portion where the flat surfaces 111E and 111F of the first roller 110A and the second roller 110B are formed, and the outer surface thereof is the first roller 110A. ) And the remaining outer circumferential surfaces 111C and 111D of the second roller 110B.

On the other hand, the restraining portion 125 of the coupling member 120 is formed in a rectangular shape fitted in correspondence with the restraint grooves 113A and 113B formed in the first roller 110A and the second roller 110B. The connection part 123 connects the outer part 121 and the restraining part 125. The restraining unit 125 of the coupling member 120 serves to restrain the first roller 110A and the second roller 110B in a combined state. That is, when the restraint portion 125 of the coupling member 120 is fitted into the restraint grooves 113A and 113B of the first roller 110A and the second roller 110B, the first roller 110A and the first roller 110A and 113B are fitted. It is possible to suppress the tendency for the two rollers 110B to open about the hinge coupling shaft 113. Therefore, the combined state of the first roller 110A and the second roller 110B by the coupling member 120 is more stably maintained. The coupling member 120 may be modified in various forms in the present invention, in which case the first roller and the second roller are also partially modified according to the deformation of the deformed coupling member 120. This will be described later through modified embodiments.

The stamper 130 is installed in close contact with the outer circumferential surfaces 111C and 111D of the stamper mounting roller 110 to form a keypad from the optical film by the pressure applied by the stamper mounting roller 110. . To this end, the stamper 130 has a molding surface 133 having a molding pattern 131 of embossed and intaglios 131A and 131B to be molded by molding an embossed or engraved boundary line, figure, etc. of the keypad. It is provided. The molding pattern 131 corresponds to one keypad, and a plurality of such molding patterns 131 are provided on the molding surface 133 of the stamper 130. As a result, the stamper-mounting roller 110 can mold a plurality of keypads each time one rotation is made. For example, as shown in the figure, four molding patterns 131 are formed in one stamper 130 in two rows and two columns, and four keypad portions may be simultaneously formed each time the stamper mounting roller 110 rotates. It can be.

As shown in FIG. 3, the molding pattern 131 formed on the stamper 130 is formed in a narrow width toward upper and lower light, that is, toward the upper side and wider toward the lower side in the case of the relief 131A. On the other hand, in the case of the intaglio 131B, the upper and lower narrowings, that is, the upper width is formed in a wider width and the lower side is formed in a narrower width. However, the upper side and the lower side here made the outer direction upward and the inner direction downward with respect to the stamper long roller 110. As such, when the molding pattern 131 of the stamper 130 is formed in an inclined shape according to the relief 13A and the relief 131B portions, as shown in FIG. 4, an ultraviolet curable resin coated on the optical film F may be referred to. After contacting with (P) to form fine protrusions, they are easily separated from the ultraviolet curable resin (P). Therefore, it becomes possible to form finer fine protrusions with higher precision.

As such, the present invention has a roller-type mold structure capable of producing a keypad at a very high speed, and is provided with a molding pattern 131 without forming the molding pattern 131 on the stamper mounting roller 110 itself. The unique configuration of mounting the thin stamper 130 on the stamper mounting roller 110 makes it possible to completely solve the problems of the roller-type mold structure.

That is, the difficult work of forming the molding pattern 131 on the stamper mounting roller 110 itself is no longer necessary. In addition, it is possible to limit the parts that are inevitably damaged due to continuous operation to the replaceable stamper 130, thereby preventing the inefficiency in the operation of replacing the entire mold (of course, because it is a roller-type mold When the contact and separation of the stamper 130 and the optical film mounted on the stamper mounting roller 110 can significantly reduce each other damage or impact).

Hereinafter, a method of mounting the stamper 130 will be described with reference to FIGS. 6 to 10.

6 to 10 is a reference diagram for explaining a series of methods for mounting the stamper according to the invention to the stamper mounting roller.

In order to mount the stamper 130 to the stamper mounting roller 110, as shown in FIG. 6, the first roller 110A and the second roller 110B are rotated about the hinge coupling shaft 113 and opened. Release. Thereafter, the stamper 130 is bent to surround the outer side of the first roller 110A and the second roller 110B, and both ends 135A and 135B of the first roller 110A and the first roller 110A. It is fixed to the flat flat surfaces 111E and 111F of the second roller 110B. At this time, since the first roller (110A) and the second roller (110B) is in the open state centered on the hinge coupling shaft 113, the curvature between the outer peripheral surface is reduced and the width of the stamper (130) that surrounds the outer margin Is loose. Therefore, it is easy to fix both ends 135A and 135B of the stamper 130 to the flat surfaces 111E and 111F.

Thereafter, both ends 135A and 135B of the stamper 130 are fixed to the flat surfaces 111E and 111F of the first roller 110A and the second roller 110B, respectively. 110A) and the second roller (110B) is rotated about the hinge coupling shaft 113 and retracted. Then, as shown in FIG. 7, the stamper 130 is brought into tight contact with the outer circumferential surfaces 111C and 111D of the first roller 110A and the second roller 110B. Thereafter, both ends 135A and 135B of the stamper 130 are fixed by fastening means such as rivets 135C or bolts.

Thereafter, as shown in FIG. 8, the other end portion that is opposite to the hinge coupling shaft 113 of the first roller 110A and the second roller 110B is coupled using the coupling member 120. To this end, while the coupling member 120 is moved in the axial direction of the stamper mounting roller 110, the constraining groove 125A is formed in the first roller 110A and the second roller 110B. And insert it into 113B). In this way, when the restraining protrusion 125A of the coupling member 120 is fully inserted into and inserted into the restraint grooves 113A and 113B of the first roller 110A and the second roller 110B, the first roller 110A and the first roller 110A and the first roller 110A and 113B are inserted. The two rollers 110B can be pinched to maintain the combined state.

Then, as shown in Figure 9 using the fastening bolt (120C) the outer portion 121 of the coupling member 120, both ends (135A, 135B) of the stamper 130, the first roller 110A and the second roller Tighten between the flat surfaces 111E and 111F of 110B. As a result, the stamper 130 may be more stably coupled to the stamper mounting roller 110. However, the fastening by the fastening bolt (120C) is an option for achieving a more stable coupling between the first roller (110A) and the second roller (110B), the coupling member 120, the stamper (130). This is because the coupling between them is already a level that can be maintained by the coupling member (120).

Therefore, the fastening bolt 120C or the fastening hole of the fastening bolt 120C formed in the coupling member 120 may be selectively provided.

In addition, in addition to the coupling member 120, an annular coupling ring 140 may be further provided to hold the first roller 110A and the second roller 110B in a more stable and coupled state. The annular coupling ring 140 has the coupling member 120, the first roller 110A and the second roller 110B in a state in which the first roller 110A and the second roller 110B are closed and coupled. It is fitted in the state wrapped around the outside of the box. The coupling ring 140 is suitable as long as it is a synthetic resin-based material having a stretchable elastic force such as rubber, and even if the material is not stretchable, only the inner diameter is correct. In addition, the coupling ring 140 is inserted into the coupling ring 140 to the outside by slightly reducing the size of the outer diameter consisting of the coupling member 120, the first roller (110A) and the second roller (110B). It is desirable not to protrude.

When the coupling ring 140, which can be additionally provided, is made up as described above, the stamper 130 is completely attached to the stamper mounting roller 110 as shown in FIG. In addition, the state can be stably maintained even during the operation of forming the keypad for a long time.

As such, the present invention can be mounted in a state in which the stamper 130 is completely in contact with the outer circumferential surface of the stamper mounting roller 110 by the stamper mounting roller 110 having a divided structure, and also facilitates replacement. Can be.

11 and 12 are reference diagrams for explaining the deformation of the coupling member according to the present invention.

As shown, the coupling members 120 ′, 120 ″ according to the present invention may not include the restricting portion 125 and the connecting portion 123 as before the deformation. In the case of FIG. 11, the constraining portion 125 of the coupling member 120 ′ before deformation is not provided, and in the case of FIG. 12, the constraining portion 125 and the connection portion 123 of the coupling member 120 ″ before deformation. This is the case without. As such, even when the coupling member such as the rivet or the bolt is not used, the first roller 110A and the second roller 110B are collected and retracted even when the coupling member 125 and the connection part 123 are not provided. There is no difficulty in combining.

Subsequently, a keypad manufacturing method of the present invention will be described with reference to FIGS. 13 to 15. 13 is a flowchart illustrating a keypad manufacturing method according to the present invention, FIG. 14 is a flowchart illustrating a method of providing a stamper according to the present invention, and FIG. 15 illustrates a keypad manufacturing method according to the present invention. It is a schematic block diagram.

First, as shown in Figure 13, the keypad manufacturing method of the present invention is a stamper mounting roller preparation step (S10), stamper preparation step (S20), stamper mounting step (S30), optical film loading step (S40) , UV curable resin coating step (S50), UV curable resin curing step (S60), optical film cutting step (S70) and the reflective layer forming step (S80) is configured.

In the stamper-mounted roller preparation step (S10), as described above, one end portion of the cutting surfaces 111A and 111B, which are bisected and contacted with each other in the axial direction, are hinged to each other so that the first roller 110A can be opened and retracted. ) And a stamper mounting roller (110) consisting of a second roller (110B).

In the stamper preparation step (S20), a stamper 130 having a molding pattern 131 is prepared, and a series of methods for manufacturing the stamper 130 are shown in FIG. ), Photosensitive layer forming step (S32), preliminary pattern forming step (S33), metal layer forming step (S34), body layer forming step (S35), and body layer separation step (S36).

In the sacrificial film forming step (S31), a sacrificial film is formed on the substrate using a material that can be removed by exposure.

In the photosensitive agent layer forming step (S32), a first photosensitive agent and a second photosensitive agent, which are heterogeneous photosensitive agents developed by different developer solutions, are formed on the sacrificial film formed on the substrate to form a photosensitive agent layer. To this end, the first photosensitive agent is applied to a predetermined thickness and cured, and then the second photosensitive agent is applied onto the cured first photosensitive agent and then cured in the same process.

In the preliminary pattern forming step (S33), after placing the mask film on the photoresist layer, an exposure process is performed by adjusting the angle so that light such as ultraviolet rays or excimer lasers is irradiated with a predetermined inclination angle. For example, vertical exposure and oblique exposure may be selectively performed to easily implement a pattern such as a prism shape, a retroreflective shape, a polygonal shape, a finely protruded letter, and a taper angle of the letter.

Such an exposure process may be performed several times while changing the irradiation angle of light as needed. As a result, a preliminary pattern is formed so that the molding pattern 131 for molding the keypad on the photosensitive agent layer can be molded on the optical film.

In the metal layer forming step (S34), a metal layer is formed along the preliminary pattern formed on the photosensitive layer.

In the body layer forming step (S35), a metal body layer to be used as the molding surface 133 for forming the keypad is formed. To this end, the metal layer is used as a seed layer to plate the metal by electroplating. For reference, the electroplating method is one of deposition methods for depositing metal ions by depositing metal ions by applying a voltage to an electrode consisting of a cathode and an anode, and electrically connecting a metal target to be plated to the anode and a product to be plated to the cathode. It is a method of finally forming a metal layer of the desired thickness through the process of dissolving in the positive electrode and depositing metal ions in the negative electrode by the.

In the body layer separation step (S36), when the first and second photoresists present on the substrate are developed with different developer, the photoresist layer is removed to separate the substrate and the body layer. This results in a body layer having a molding pattern 131 to be used as the stamper 130 of the molding apparatus. This completes the stamper preparation step (S20).

Subsequently, in the stamper mounting step S30, as described above, the first roller 110A and the second roller 110B are rotated about the hinge coupling shaft 113 to open the stamper 130. ) Both ends 135A and 135B of the first roller 110A and the second roller 110B, respectively, to the other end portions of the flat surfaces 111E and 111F of the second roller 110B, and then the first roller 110A. And second rollers 110B are gathered and then combined by the coupling member 120 so as not to be opened.

In the optical film loading step (S40), the optical film (F0, see Fig. 15) is transported to the stamper mounting roller 110 is mounted with a stamper 130 having a molding pattern (131) do. For this purpose, referring to FIG. 15, the optical film F0 is formed in the auxiliary rollers 201 and 202 and the feed rollers 203 and 204 which are paired to face the stamper mounting roller 110 and the stamper mounting roller 110 before molding. By conveying.

As the optical film F0 loaded in the optical film loading step S40, a film made of a polycarbonate (PC) material is used. PC film is economical, optically transparent, and excellent in tensile strength, making it suitable for use in keypads. In addition, even when the thickness is 0.1 to 2 [mm], there is an advantage that it has sufficient strength and flexibility to move the oligomer composition layer, which is an ultraviolet curable resin formed on the entire surface of the hard stamper 130. In addition, polyethylene terephthalate (PET) having properties similar to PC films may also be used as the material of the optical film F0. Other materials that can be used as optical films include celluloseacetate, polyurethane, polyester, polyvinyl chloride, celluloseacetate propionayte, and polyether sulfone polyester sulfon), PMMA (poly methylmethacrylate), thin glass, thin metal and paper.

In the UV curable resin coating step (S50), by applying an ultraviolet curable resin to the optical film (F0) to form a fine projection by the molding pattern 131. To this end, the ultraviolet curable resin (P) is evenly added to the surface of the stamper (130). In order to evenly add the ultraviolet curable resin (P) to the surface of the stamper 130, it should be able to properly adjust the flow rate and the hydraulic pressure to which the ultraviolet curable resin is injected. The UV curable resin P injected into the surface of the stamper 130 is loaded and applied to one surface of the optical film F0 contacting the stamper 130. At this time, the UV curable resin (P) applied to the surface of the optical film (F0) is the auxiliary film in which the optical film (F0) is paired with the stamper mounting roller 110 and the stamper mounting roller (110). It is preferable to pressurize when passing between 201, and the pressurization at this time is for the ultraviolet curable resin P to be smoothly filled in a cavity existing in the optical film F0. At this time, the said ultraviolet curable resin (P) is suitable as long as it is a crosslinkable oligomer composition containing hard and soft segment which has the surface of a microstructure. The oligomer composition should be in the range of 1000 to 5000 cps viscosity, more preferably in the range of 2000 to 3000 cps viscosity in order to improve the filling ability for fine cavities. If the viscosity exceeds the 1000 to 5000cps viscosity range bubbles are trapped to increase the defect rate of the product and the flowability is poor to completely fill the cavity. On the other hand, if it falls short of the appropriate range, since the total equivalent weight (weight per reactive functional group) of the oligomer resin is too low, there is a high possibility that a problem occurs in obtaining a desired shape due to severe shrinkage during ultraviolet curing.

In the ultraviolet curable resin curing step (S60), the ultraviolet curable resin (P) applied to the surface of the optical film (F0) is irradiated with ultraviolet rays with an ultraviolet lamp 301 to cure the ultraviolet curable resin (P). As a result, the fine protrusions formed on the ultraviolet curable resin P applied to the surface of the optical film F0 in the previous step S50 are in a state capable of stably maintaining the shape thereof. Here, the micro-projections may include all of the micro-projections such as letters and symbols together with prismatic shapes, retroreflective shapes, polygonal shapes, etc., which can generate various optical effects.

In the optical film cutting step (S70), the optical film (F1) molded by a plurality of molding patterns are cut into individual pieces.

In the reflective layer forming step (S80), to form a reflective layer on one side of the cut optical film (F1) in order to increase the reflectance by the fine projection formed on the surface of the cut optical film and to give various optical effects. In this process, a fluorescent material or raw material is applied to part or all of the surface of the optical film F1 by a method such as physical vapor deposition (PVD) or sputtering.

Before such a process, the cut optical film F1 may be cut into a desired shape to form a separator groove, and if necessary, a material layer may be inserted to fill the remaining part except for some of the separator grooves.

As described above, the present invention can produce a large amount of keypad at a faster speed while precisely forming a desired fine protrusion while rotating the stamper mounting roller 110.

The keypad thus produced is subjected to post-processing and commercialized in the form of a keypad assembly. For reference, the keypad assembly is manufactured through the keypad manufacturing method of the present invention, a rubber having a plurality of keys (buttons) and a contact point with a circuit board by a dome switch while having a predetermined elasticity and restoring force. It is made of a combination of the dome switch sheet of the material, and may further include a decorative separator coupled to the dome switch sheet to protrude to the outside through the separation groove formed between the keys of the keypad.

On the other hand, the present invention can be cured by applying an ultraviolet curable resin (P) on both sides of the optical film (F0) through a simple additional configuration. The configuration change for this can be easily seen by comparing FIG. 15 with FIG. 16. That is, referring to FIG. 16, in which the UV curable resin P is applied to both surfaces of the optical film F0, the stamper mounting roller 110 and the UV lamp 301 are respectively installed in two places. You can see that. In addition, by changing the contact surface of the optical film (F0) is loaded on the two stamper mounting rollers 110 to be different from each other, UV curable resins sequentially on both the rear surface (130B) and the front surface (130A) of the optical film (F0) P) was applied to allow curing. In the double-sided molding structure of the optical film F0, the background fine protrusions 131C such as a prism shape and a retroreflective shape, which can generate various two-optical effects through reflection of light on the entire back surface 130B of the optical film F0, are formed. ), And the partial region fine protrusions 131A, such as letters or patterns, may be formed on the front surface 130A. Thereafter, when the reflective material, fluorescent material, or various colors of paint are coated on the entire surface or part of the back surface 130B of the formed optical film F2 as in the above-described reflective layer forming step S80, the background fine protrusion 131B The effect of) can be prominently displayed on the front of the keypad.

With such a simple configuration change, the UV curable resin is coated on both surfaces in one process without a separate process, thereby obtaining an optical film F2 having fine protrusions.

17 is an exploded perspective view for explaining a molding apparatus of the present invention according to a modified embodiment.

As shown, the molding apparatus of the present invention according to the modified embodiment has a configuration in which the stamper mounting roller is not divided as compared with before the deformation. The modified configuration will be described below.

The stamper mounting roller 410 is provided with a cylindrical body that is not divided.

And the outer peripheral surface of the concave shape fitting bones (412,413) is formed long along the axial direction. The fitting bones 412 and 413 are divided into two parts, a narrow bone 412 formed in a shallow area and a wide bone 413 formed in a deep area extending from the narrow bone 412, and the narrow bone 412. The wider bone 413 is formed wider than it is.

In addition, the fitting member 420 corresponding to the coupling member 120 before deformation is provided. The fitting member 420 has a bar-shaped body formed along the axial direction of the stamper mounting roller 410 to be fitted in the axial direction corresponding to the fitting bones 412 and 413. The fitting member 420 has a narrow quadrangular section 421 of a narrow rectangular cross section corresponding to the narrow bone 412 of the fitting bones 412 and 413, and a wide square corresponding to the wide bone 413 of the fitting bones 412 and 413. It consists of a wide-area part 425 of a cross section. The wide area portion 425 has fitting protrusions 425A on both sides and is fitted in close contact with the wide bone valleys 413 of the fitting bones 412 and 413.

On the other hand, the stamper 430 is wrapped around the outer circumferential surface of the stamper mounting roller 430, both ends 435 are bent inward to narrow the narrow bone 412 and the fitting member 420 of the fitting bone (412,413) It is configured to be fitted between the narrow portion 421 of the).

The molding apparatus having a deformed configuration as described above has an advantage of having a simple configuration as compared with before deformation.

Example 2

18 is a perspective view showing a second embodiment of a keypad forming apparatus for a portable terminal according to the present invention, FIG. 19 is a sectional view taken along line II ′ of FIG. 18, and FIG. 20 is a second embodiment of the present invention. It is a reference diagram showing the separation of the forming roller and the ultraviolet curable resin according to the example.

As shown, the molding apparatus for manufacturing a keypad according to the present invention is to break away the mold structure of the flat plate type so far, and to form a molding roller 100 having a roller type mold structure that has not been tried so far for the keypad manufacturing of the mobile terminal. present.

In the configuration of the present invention, the molding pattern 131 is formed on the outer circumferential surface of the molding roller 100 which is generally cylindrical. The molding pattern 131 is formed of embossed and intaglios 131A and 131B so as to mold and shape a boundary line, a figure, and the like which are embossed or engraved on the keypad. The molding pattern 131 corresponds to one keypad, and a plurality of such molding patterns 131 are provided on an outer circumferential surface of the molding roller 100 serving as a molding surface. As a result, a plurality of keypads can be molded each time the forming roller 100 rotates once. For example, as shown in the drawing, if a total of four molding patterns 131 are formed in two rows and two columns on the outer circumferential surface of the forming roller 100, four keypad portions can be simultaneously formed each time the forming roller 100 is rotated one by one. will be.

As shown in FIG. 19, the forming pattern 131 formed on the outer circumferential surface of the forming roller 100 may be formed in a narrow width toward upper and lower beams, that is, toward the upper side and wider toward the lower side, as shown in FIG. 19. On the other hand, in the case of the intaglio 131B, the upper and lower narrowings, that is, the upper width is formed in a wider width and the lower side is formed in a narrower width. However, the upper side and the lower side here made the radial outer side direction upper side and the inner side lower side with respect to the shaping | molding roller 100. As such, when the molding pattern 131 is formed in an inclined form according to the relief 13A and the relief 131B portions, as shown in FIG. 20, the molding pattern 131 contacts the ultraviolet curable resin P coated on the optical film F. After forming the fine projections are easily separated from the ultraviolet curable resin (P). Therefore, it becomes possible to form more precise fine protrusions.

As such, the present invention has a roller-type mold structure capable of producing a keypad at a very high speed, and has a mold structure of a conventional flat plate type by forming a molding pattern 131 on the forming roller 100 itself. It can completely solve the problem.

That is, the present invention completely solves the problem that the impact and the load are transmitted to the apparatus and the molded object (the optical film F) by the method of repeating contact with the surface facing each other like the conventional flat mold structure. It can be solved. In addition, damage and impact between each other when contacting and separating the molded object (optical film (F)) can be significantly reduced.

As a result, when producing a keypad for a mobile terminal using a conventional flat type mold, a defect rate of 50% can be reduced to an extremely small level.

Subsequently, a keypad manufacturing method of the present invention will be described with reference to FIGS. 21 to 23.

21 is a flowchart illustrating a keypad manufacturing method according to a second embodiment of the present invention, and FIG. 22 is a schematic diagram illustrating a keypad manufacturing method according to a second embodiment of the present invention. 23 is a schematic diagram illustrating a method for manufacturing both sides of the keypad according to the second embodiment of the present invention.

First, as shown in Figure 21, the keypad manufacturing method of the present invention is a molding roller preparation step (S10), optical film loading step (S20), UV curing resin coating step (S30), UV curing resin curing step (S40) It is configured to include an optical film cutting step (S50) and a reflective layer forming step (S60).

In the forming roller preparation step (S10), a cylindrical core for a forming roller is already made of a durable material such as stainless steel, and a forming pattern 131 is formed on the outer circumferential surface of the core. The forming pattern 131 is formed by the following series of processes.

That is, it comprises a sacrificial film forming step, a photoresist layer forming step, a preliminary pattern forming step, a metal layer forming step, a body layer forming step, a body layer separation step.

In the sacrificial film forming step, a sacrificial film is formed on the outer circumferential surface of the core (the forming roller before the forming pattern is formed) using a material that can be removed by exposure.

In the photoresist layer forming step, a photoresist layer is formed by applying a first photoresist and a second photoresist, which are heterogeneous photoresists, which are developed by different developers on the sacrificial film formed on the outer circumferential surface of the core. To this end, the first photosensitive agent is applied to a predetermined thickness and cured, and then the second photosensitive agent is applied onto the cured first photosensitive agent and then cured in the same process.

In the preliminary pattern forming step, the mask film is positioned on the photoresist layer, and an exposure process is performed by adjusting the angle so that light such as ultraviolet rays or excimer lasers is irradiated with a predetermined inclination angle. For example, vertical exposure and oblique exposure may be selectively performed to easily implement a pattern such as a prism shape, a retroreflective shape, a polygonal shape, a finely protruded letter, and a taper angle of the letter. Such an exposure process may be performed several times while changing the irradiation angle of light as needed. Thus, a preliminary pattern is formed so that the molding pattern 131 for molding the keypad on the photosensitive agent layer can be molded on the optical film.

In the metal layer forming step, a metal layer is formed along a preliminary pattern formed on the photosensitive layer.

In the body layer forming step, a metal body layer to be used as a molding surface for molding the keypad is formed. To this end, the metal layer is used as a seed layer to plate the metal by electroplating. For reference, the electroplating method is one of deposition methods for depositing metal ions by depositing metal ions by applying a voltage to an electrode consisting of a cathode and an anode, and electrically connecting a metal target to be plated to the anode and a product to be plated to the cathode. It is a method of finally forming a metal layer of the desired thickness through the process of dissolving in the positive electrode and depositing metal ions in the negative electrode by the.

In the body layer separation step, when the first photosensitive agent and the second photosensitive agent on the outer peripheral surface of the core are developed with different developer, the photosensitive agent layer is removed to separate the outer peripheral surface and the body layer of the core. As a result, a body layer having a molding pattern 131 of the molding roller 100 is obtained. This completes the forming roller preparation step. Here, it is a matter of course that a simple method of processing such as cutting directly on the outer circumferential surface of the forming roller 100 may be performed without the above steps for forming the forming pattern 131. However, it is preferable to go through these steps for a more precise molding pattern 131.

In the optical film loading step (S20), the optical film (F0, see Fig. 22) to the molding roller 100 having a molding pattern 131 is characterized in that the transport. For this purpose, referring to FIG. 22, the optical film F0 before the molding is transferred by the auxiliary rollers 201 and 202 and the feed rollers 203 and 204 which are paired to face each forming roller 100.

As the optical film F0 loaded in the optical film loading step S20, a film made of a polycarbonate (PC) material is used. PC film is economical, optically transparent, and excellent in tensile strength, making it suitable for use in keypads. In addition, even when the thickness is 0.1 to 2 [mm], there is an advantage that it has sufficient strength and flexibility to move the oligomer composition layer, which is an ultraviolet curable resin formed on the entire surface of the hard stamper 130. In addition, as the material of the optical film (F0), PET (polyethylene terephthalate) having properties similar to the PC film may also be used. Other materials that can be used as optical films include cellulose acetate, polyurethane, polyester, polyvinylchloride, cellulose acetate propionayte, and polyether sulfone (polyester sulfon), poly methyl methacrylate (PMMA), thin glass, thin metal and paper.

In the ultraviolet curable resin coating step (S30), by applying an ultraviolet curable resin to the optical film (F0) to form a fine projection by the molding pattern 131. To this end, the ultraviolet curable resin (P) is evenly injected into the outer circumferential surface of the forming roller (100). In order to evenly add the ultraviolet curable resin (P) to the surface of the molding roller 100, the flow rate and the hydraulic pressure into which the ultraviolet curable resin is injected should be properly adjusted. The UV curable resin P injected into the surface of the forming roller 100 is loaded and applied to one surface of the optical film F0 contacting the forming roller 100. At this time, the ultraviolet curable resin (P) applied to the surface of the optical film (F0) of the auxiliary roller 201 is a pair of the optical film (F0) is formed to face the forming roller 100 and the forming roller (100). It is preferable to be pressurized when passing through, and the pressurization at this time is for the ultraviolet curable resin P to be smoothly filled in a cavity existing in the optical film F0. At this time, the said ultraviolet curable resin (P) is suitable as long as it is a crosslinkable oligomer composition containing hard and soft segment which has the surface of a microstructure. The oligomer composition should be in the range of 1000 to 5000 cps viscosity, more preferably in the range of 2000 to 3000 cps viscosity in order to improve the filling ability for fine cavities. If the viscosity exceeds the 1000 to 5000cps viscosity range bubbles are trapped to increase the defect rate of the product and the flowability is poor to completely fill the cavity. On the other hand, if it falls short of the appropriate range, the total equivalent weight of the oligomer resin (weight per reactive reactive container) is too low, causing severe shrinkage as UV curing proceeds, resulting in a problem of obtaining a desired shape.

In the ultraviolet curable resin curing step (S40), the ultraviolet curable resin (P) applied to the surface of the optical film (F0) is irradiated with ultraviolet rays with an ultraviolet lamp 301 to cure the ultraviolet curable resin (P). As a result, the fine protrusions formed on the ultraviolet curable resin P applied to the surface of the optical film F0 in the previous step S30 are in a state capable of stably maintaining the shape thereof. Here, the micro-projections may include all of the micro-projections such as letters and symbols together with prismatic shapes, retroreflective shapes, polygonal shapes, etc., which may create various optical effects.

In the optical film cutting step (S50), the optical film (F1) molded by a plurality of molding patterns are cut into individual pieces.

In the reflective layer forming step (S60), to form a reflective layer on one side of the cut optical film (F1) in order to increase the reflectance by the fine projection formed on the surface of the cut optical film and to give various optical effects. This process deposits a desired material, such as a fluorescent material, on a part or all of the surface of the optical film F1 by a method such as physical vapor deposition (PVD) or sputtering.

Before such a process, the cut optical film F1 may be cut into a desired shape to form a separator groove, and if necessary, a material layer may be inserted to fill the remaining part except for some of the separator grooves.

As described above, the present invention can produce a large amount of the keypad at a higher speed while precisely forming the desired fine protrusion while rotating the forming roller 100. The keypad thus produced is subjected to post-processing and commercialized in the form of a keypad assembly. For reference, the keypad assembly is manufactured through the keypad manufacturing method of the present invention, a rubber having a plurality of keys (buttons) and a contact point with a circuit board by a dome switch while having a predetermined elasticity and restoring force. It is made of a combination of the dome switch sheet of the material, and may further include a decorative separator coupled to the dome switch sheet to protrude to the outside through the separation groove formed between the keys of the keypad.

On the other hand, the present invention can be cured by applying an ultraviolet curable resin (P) on both sides of the optical film (F0) through a simple additional configuration. The configuration change for this can be easily seen by comparing FIG. 22 and FIG. That is, referring to Figure 23 of the content of curing by applying the ultraviolet curable resin (P) on both sides of the optical film (F0), unlike the Figure 22, the molding roller 100 and the ultraviolet lamp 301 is installed in two places respectively Can be. Then, the UV curable resin (P) is sequentially applied to both the rear surface 130B and the front surface 130A of the optical film F0 by different contact surfaces of the optical film F0 loaded and contacted on the two forming rollers 100. Was applied to allow curing. In the double-sided molding structure of the optical film F0, the background fine protrusion 131C such as a prism shape and a retroreflective shape that can generate various optical effects through reflection of light on the entire back surface 130B of the optical film F0. And a partial region fine protrusion 131A such as a character or a pattern may be formed on the front surface 130A. Thereafter, when the reflecting material, the fluorescent material, or the paint of various colors is coated on the entire surface or part of the rear surface 130B of the molded optical film F2 as in the above-described reflective layer forming step S80, the background micro-projections ( The effect of 131B) can be prominently displayed on the front of the keypad.

With such a simple configuration change, the UV curable resin is coated on both surfaces in one process without a separate process, thereby obtaining an optical film F2 having fine protrusions.

Example 3

24 is a perspective view showing a third embodiment of a keypad forming apparatus for a mobile terminal according to the present invention, and FIG. 25 is an exploded perspective view for explaining the configuration of the keypad forming apparatus according to the third embodiment of the present invention. . However, in the accompanying drawings, the components of the rollers are omitted.

As shown, the keypad forming apparatus 10 according to the present invention has a stamper coupling core 200 that can be easily mounted and replaced in the core insertion groove 110 formed by being recessed in the outer peripheral surface of the cylindrical roller 100 The technical mold and the roller mold including the cylindrical roller 100, the stamper coupling core 200 and the stamper 300, and additionally the stamper coupling core 200 to the cylindrical roller 100 It characterized in that it further comprises an annular coupling ring 400 that can be fixed).

According to the schematic configuration of the present invention with a focus on this, the cylindrical roller 100 has an insertion groove 110 formed to be recessed on an outer circumferential surface thereof, and the stamper 300 is coupled to the core insertion groove 110. The stamper coupling core 200 is inserted and seated.

In addition, the cylindrical roller 100 and the annular coupling ring 400 for wrapping and pressing the outer surface of the stamper coupling core 200 in order to fix the seated coupling core 200 of the cylindrical Both ends of the roller 100 are fitted.

The configuration of the cylindrical roller 100 and the stamper coupling core 200, the stamper 300 and the annular coupling ring 400 will be described in more detail with reference to the stamper coupling core 200, which is a technical main part. Same as

The stamper coupling core 200 is formed with the same curvature as the outer circumferential surface of the cylindrical roller 100, the outer surface is provided with a flat rectangular inner surface on the opposite side of the outer surface and perpendicular to the inner surface While consisting of a peripheral surface connected to the outer surface.

In addition, the stamper coupling core 200 is formed in such a size that it fits tightly without gaps in the core insertion recess 110.

As a result, the stamper coupling core 200 can form the molded object without shaking while rotating by the rotation of the cylindrical roller 100, and as a result of shaking due to impact when working with a conventional flat stamper. The defective rate which occurs can be greatly reduced.

The stamper 300 having a molding pattern is closely coupled to an outer surface of the stamper coupling core 200.

A coupling method of the stamper 300 and the stamper coupling core 200 is as follows.

First, the stamper coupling core 200 is fixed using a jig. The stamper coupling core 200 has a rectangular flat bottom surface and a circumferential surface that is in contact with the vertical surface thereof, so that the stamper coupling core 200 is much easier to fix than a cylindrical roller.

This determines the position where the stamper 300 is coupled to the stamper coupling core 200 fixed to the jig.

Then, the stamper 300 having a flat shape is pressed against the outer surface of the stamper coupling core 200 and slowly pressed to have a curved surface with the same curvature as the outer surface of the stamper coupling core 200.

Then, while maintaining this state, the edge portion of the stamper 300 is welded to engage with the stamper coupling core 200.

As such, the coupling process may be easily performed by directly coupling the stamper 300 to the stamper coupling core 200.

In addition, a plurality of workers may be mounted to the cylindrical roller 100 by welding the stamper 300 to the plurality of the stamper coupling core 200 at the same time.

The stamper 300 is tightly coupled along the outer surface of the stamper mounting core 200 to form a keypad from the optical film by the pressure applied by the cylindrical roller 100.

To this end, the stamper 300 has a molding surface having an embossed and engraved molding pattern so as to be molded by molding a boundary line, a figure, or the like formed into an embossed or intaglio of the keypad.

The molding pattern corresponds to one keypad, and a plurality of such molding patterns are provided on the molding surface of the stamper 300.

The method of forming the molding pattern as described above includes a sacrificial film forming step, a photoresist layer forming step, a preliminary pattern forming step, a metal layer forming step, a body layer forming step, and a body layer separating step.

In the sacrificial film forming step, a sacrificial film is formed on the molding pattern forming surface using a material that can be removed by exposure.

In the photoresist layer forming step, a photoresist layer is formed by applying a first photoresist and a second photoresist, which are heterogeneous photoresists, which are developed by different developers on the sacrificial film formed on the molding pattern formation surface. To this end, the first photosensitive agent is applied to a predetermined thickness and cured, and then the second photosensitive agent is applied onto the cured first photosensitive agent and then cured in the same process.

In the preliminary pattern forming step, the mask film is positioned on the photoresist layer, and an exposure process is performed by adjusting the angle so that light such as ultraviolet rays or excimer lasers is irradiated with a predetermined inclination angle. For example, vertical exposure and oblique exposure may be selectively performed to easily implement a pattern such as a prism shape, a retroreflective shape, a polygonal shape, a finely protruded letter, and a taper angle of the letter. Such an exposure process may be performed several times while changing the irradiation angle of light as needed. As a result, a preliminary pattern is formed so that the molding pattern for molding the keypad on the photosensitive agent layer can be molded on the optical film.

In the metal layer forming step, a metal layer is formed along a preliminary pattern formed on the photosensitive layer.

In the body layer forming step, a metal body layer to be used as a molding surface for molding the keypad is formed. To this end, the metal layer is used as a seed layer to plate the metal by electroplating. For reference, the electroplating method is one of deposition methods for depositing metal ions by depositing metal ions by applying a voltage to an electrode consisting of a cathode and an anode, and electrically connecting a metal target to be plated to the anode and a product to be plated to the cathode. It is a method of finally forming a metal layer of the desired thickness through the process of dissolving in the positive electrode and depositing metal ions in the negative electrode by the.

In the body layer separation step, when the first photosensitive agent and the second photosensitive agent existing on the substrate are developed with different developing solutions, the photosensitive agent layer is removed to separate the substrate and the body layer. This results in a body layer having a molding pattern to be used as the stamper 300 of the molding apparatus.

The stamper 300 in the present invention is provided with two molding patterns along the axial direction of the cylindrical roller 100.

The cylindrical roller 100 on which the stamper coupling core 200 is mounted has a cylindrical shape as a whole, and a plurality of the core insertion grooves 110 are formed by being recessed in the outer circumferential surface as described above. The core insertion recess 110 has a flat bottom surface having a quadrilateral shape, and an insertion surface of the stamper coupling core 200 having a front and rear, left and right circumferential surfaces of the front and rear surfaces perpendicular to the flat bottom surface is inserted. It is formed to be seated.

However, since the corner portion of the core insertion groove 110 may be caught by the edge portion of the core insertion groove 110 when the edge of the stamper coupling core 200 is inserted, the core insertion groove to avoid this It is preferable to include the locking groove 120 of the shape of the deeper portion of the corner of the 110 deeper.

The cylindrical roller 100 is preferably provided with four core insertion grooves 110 at regular intervals along the outer circumferential surface.

As such, when the stamper coupling core 200 in which the stamper 300 having four identical shape patterns is coupled to the four core insertion recesses 110 provided in the cylindrical roller 100 is mounted, Cylindrical roller 100 is a cylindrical having a smooth outer peripheral surface as a whole.

As such, one cylindrical roller 100 on which the stamper coupling core 200 is mounted may form eight identical keypads every one revolution.

Alternatively, various types of keypads may be molded by attaching stampers 300 having different molding patterns to the stamper coupling core 200 according to an arbitrary purpose of the user.

Since the stamper coupling core 200 and the stamper 300 are most preferably coupled by welding at present, the stamper coupling core 200 and the stamper 300 should be made of a weldable material. .

At the same time, the stamper 300 must be made of a material that is also durable because it must form a keypad by continuously pressing the optical film.

Therefore, the stamper coupling core 200 and the stamper 300 is preferably made of stainless steel.

In contrast, the cylindrical roller 100 is provided with the core insertion recess 110 so that the stamper coupling core 200 and the stamper 300 joined by welding as described above are the core insertion recess. It is fixed to the fitting 110 or by the ring coupling ring 400 of the annular so as not to be greatly dependent on the material.

Therefore, the metal material series to the plastic material series can be freely selected or carried out, or the inside is made of a metal material and the outer shape of the plastic material or synthetic resin material wrapped around the outside freely to manufacture the cylindrical roller 100 Can be used.

In the present invention, the cylindrical roller 100 is preferably made of light aluminum that is resistant to corrosion.

In addition, a pair of annular coupling rings 400 may be further provided to maintain the stamper coupling core 200 inserted into the cylindrical roller 100 in a more stable state.

The annular coupling ring 400 has an outer side of the cylindrical roller 100 and the stamper coupling core 200 in a state where the stamper coupling core 200 is inserted into the cylindrical roller 100. It is inserted in the state wrapped around the pressure.

The annular coupling ring 400 is a size capable of wrapping and pressing a portion of the end of the stamper coupling core 200 is inserted into the cylindrical roller 100 at the end of the cylindrical roller 100 seated Is formed.

The annular coupling ring 400 is suitable as long as it is a synthetic resin-based material having a stretchable elastic force, such as rubber, and even if it is not stretchable, the inner diameter of the cylindrical roller 100 can be wrapped and pressed. It is OK to have a dimension.

In addition, the portion of the annular coupling ring 400 is fitted to the cylindrical roller 100 and the stamper coupling core 200 by slightly reducing the size of the outer diameter so that the annular coupling ring 400 to the outside You can also prevent it from protruding.

However, even when the annular coupling ring 400 is exposed, the auxiliary rollers, which are paired to face the cylindrical roller 100, are arranged between the annular coupling rings 400 fitted to both ends of the cylindrical roller. Since it is engaged with the (100) does not interfere with the operation.

As such, when the annular coupling ring 400 is fitted, the cylindrical roller 100 and the stamper coupling core 200 are completely attached to each other as shown in FIG. 25.

In addition, the state can be stably maintained even during the operation of forming the keypad for a long time.

As such, the present invention can be mounted in a state in which the stamper coupling core 200 having a separate structure is completely in contact with the cylindrical roller 100 through the annular coupling ring 400, and also easy to replace It can be done.

Next, a modification of the keypad forming apparatus according to the present invention will be described.

26 is an exploded perspective view showing a modification of the keypad forming apparatus according to the third embodiment of the present invention.

As shown, the modification of the present invention comprises a cylindrical roller formed by inserting the core insertion recess into the outer circumferential surface and a core having a molding pattern formed to mold the object to be inserted and seated in the core insertion recess.

In the modification configured as described above, the core 500 includes a core 500 having a molding pattern in which a molding pattern for molding a molded object is directly molded on the outer surface of the core, as compared with the third embodiment. The unique technical idea of being mounted on the roller 100 is not changed. Therefore, a portion overlapping with the above-described third embodiment will be omitted.

A molding protrusion for forming a molded object is directly formed on an outer surface of the core 500 inserted and seated in the core insertion recess 110 formed on the outer circumferential surface of the cylindrical roller 100.

Therefore, by forming a molding pattern directly on the outer surface of the core 500 as described above, the process of welding to couple the stamper 130 to the outer surface of the core 500 can be omitted.

As such, the present invention has a roller-type mold structure capable of producing a keypad at a very high speed, and has a molding pattern without forming a molding pattern on the roller itself or directly coupling the stamper to the cylindrical roller. By coupling the stamper 300 to the stamper coupling core 200 and then mounting the cylindrical roller to the cylindrical roller, the keypad may be further supplemented with the advantages of the conventional mold structure of the roller type. have.

In addition, it is easy to replace the stamper coupling core 200 which is inevitably damaged due to continuous operation.

Example 4

27 is an exploded perspective view showing a fourth embodiment of a keypad forming apparatus for a mobile terminal according to the present invention, and FIG. 28 is a side view showing a coupling form of the keypad forming apparatus according to the fourth embodiment of the present invention.

The keypad forming apparatus 30 for a portable terminal of the present invention as shown in the drawing has a structure in which a stamper 700 having a molding pattern 710 for forming a molded object is formed on the outer circumferential surface of the cylindrical roller 600. Have The stamper 700 is preferably composed of one sheet, which may be provided to surround the outer circumferential surface of the roller 600 and adhere closely to the surface thereof. Reference numeral '610' in the drawings is 'roller shaft'.

According to the fourth embodiment of the present invention having the above-described configuration, the keypad forming apparatus for a portable terminal becomes simpler in construction and convenient to manufacture.

The preferred embodiment of the present invention has been described above. The present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, according to the keypad forming apparatus for a portable terminal according to the present invention and a method for manufacturing the same, a product type per unit time can be dramatically increased by a roller type mold structure.

In addition, the present invention can minimize the defective rate of the product to be manufactured can improve the product productivity.

In addition, the present invention can eliminate the inefficiency of the roller-type mold by the unique configuration that can replace the stamper from the stamper mounting roller and reduce the maintenance cost.

In addition, the present invention can easily produce various kinds of keypads having other types of fine protrusions by simply replacing the stamper.

In addition, the present invention can easily perform the mounting and replacement of the stamper by the divided structure of the stamper mounting roller.

In addition, the present invention can easily adjust the light intensity of the ultraviolet lamp and the concentration of the ultraviolet curable resin, etc., thereby enabling to precisely implement the fine projection of the keypad.

In addition, the present invention can easily change the characteristic value of the ultraviolet curable resin, thereby producing a keypad with the desired physical properties.

In addition, the present invention may be formed to be inclined so that the molding pattern of the stamper can be easily separated after forming the fine protrusions on the ultraviolet curable resin can form a more precise fine protrusions.

In addition, the present invention can be produced on a PC or PET film, it is advantageous to produce a keypad having excellent crosslinkability.

In addition, the present invention can be formed by dividing both sides of the keypad in one process with an additional simple configuration without the need to add a complicated configuration of the bead.

When the keypad is manufactured using the keypad forming apparatus for a portable terminal according to the present invention, it is easy to install and replace the stamper on the roller by the core combined with the stamper while maintaining the existing advantages of the roller type mold structure. Can be.

In addition, the present invention can replace only the partially damaged stamper coupling core from the cylindrical roller can reduce the maintenance cost.

In addition, the present invention can be carried out by freely selecting the manufacturing material of the cylindrical roller without coupling the stamper directly to the cylindrical roller.

Claims (34)

A keypad forming apparatus for a portable terminal, comprising a roller mounted on an outer circumferential surface of a stamper having a molding pattern for molding a workpiece. The method of claim 1, The molded object is a curable resin coated on the surface of the optical film and the optical film to form fine projections by the molding pattern, and as a result, a keypad forming apparatus for a mobile terminal. The method of claim 2, The molding pattern is formed in the width of the upper and lower light in the case of the embossed portion to facilitate separation from the curable resin after contact with the curable resin to form a fine projection, in the case of the intaglio portion is formed in the width of the upper light lower narrow Keypad molding apparatus for mobile terminal. The method of claim 1, The stamper mounting roller, the keypad forming apparatus for a mobile terminal, characterized in that consisting of the first roller and the second roller divided in the axial direction. The method of claim 4, wherein The first roller and the second roller is a keypad forming apparatus for a portable terminal, characterized in that the one end portion of the cutting surface in contact with the outer peripheral surface is hinged to each other, can be opened and contracted around the hinged axis. The method of claim 4, wherein The first roller and the second roller is a keypad forming apparatus for a mobile terminal, characterized in that further comprising a coupling member for engaging the other end portion opposite to the one side end of the hinge coupled in the retracted state. The method of claim 6, The outer circumferential surface of the other end portion of the first roller and the second roller is formed in the form of a flat surface along the axial direction, and the coupling member is the same as the remaining outer circumferential surfaces of the first roller and the second roller while covering the flat surface. A keypad forming apparatus for a mobile terminal, comprising: an outer portion having an outer surface that forms a curved surface with curvature. The method of claim 7, wherein The first roller and the second roller are formed in the axial direction constrained grooves are formed in the cutting surface along the axial direction, the coupling member is fitted corresponding to the restraint groove to restrain the first roller and the second roller in the coupled state Keypad forming apparatus for a mobile terminal, characterized in that it comprises a restraining projection and the connecting portion for connecting the outer portion and the restraining projection. The method of claim 6, The mobile terminal further comprises an annular coupling ring for wrapping and pressing the outer side of the coupling member, the first roller and the second roller in a state in which the coupling member is coupled to the first roller and the second roller. Keypad molding device for use. The method according to any one of claims 5 to 9, The stamper wraps around the first roller and the second roller, and both ends thereof are fixed to the other end portion opposite to the hinged one end portion of the first roller and the second roller, and one end of the stamper. Is fixed to the flat surface of the first roller and the other end is fixed to the flat surface of the second roller keypad molding apparatus, characterized in that. The method of claim 1, The stamper mounting roller has a fitting bone formed along the axial direction by being recessed from an outer circumferential surface, and further includes a fitting member fitted to the fitting bone, and the stamper surrounds the outer circumferential surface of the stamper mounting roller at both ends thereof. Keypad molding apparatus for a mobile terminal, which is bent inwardly and is inserted and fixed between the fitting bone and the fitting member. The method according to any one of claims 1 to 9 and 11, The stamper is a keypad forming apparatus for a mobile terminal, characterized in that it comprises a plurality of molding patterns so that at the time of one rotation of the stamper mounting roller to form a plurality of products at the same time. As a method of manufacturing a keypad for a mobile terminal, Mounting a stamper on which a molding pattern for forming a fine protrusion is formed to be in close contact with an outer circumferential surface of the roller; Loading and transporting an optical film on the stamper mounting roller; Forming a fine protrusion by the molding pattern by applying an ultraviolet curable resin to the optical film; The method of manufacturing a keypad for a mobile terminal, comprising the step of curing the applied ultraviolet curable resin by irradiating ultraviolet rays. The method of claim 13, Preparing a separate additional stamper mounting roller having a molding pattern different from that of the stamper mounting roller; UV curable resin is applied to one side of the optical film and cured, and then the optical film is loaded and transferred to the additional stamper mounting roller; Applying an ultraviolet curable resin to the other side of the optical film; The method for manufacturing a keypad for a mobile terminal, characterized in that for molding the both sides of the optical film further comprising the step of curing the ultraviolet curable resin applied to the other side of the optical film by applying ultraviolet light. The method of claim 13 or 14, wherein the forming of the molding pattern in the stamper mounting roller, Forming a sacrificial film by applying a material to be removed in exposure to a roller outer peripheral surface in a boring state before the forming pattern is formed; Forming a photoresist layer by applying a first photosensitive agent and a second photosensitive agent, which are heterogeneous photoresists, which are developed by different developers on the sacrificial film formed on the outer circumferential surface; Placing a mask film on the photoresist layer and exposing the mask film to form a preliminary pattern for a molding pattern on the photoresist layer; Forming a metal layer on the photoresist layer on which the preliminary pattern is formed; Forming a body layer on the metal layer; Method for manufacturing a keypad for a mobile terminal, characterized in that comprising the step of separating the body layer. The method of claim 15, The forming of the preliminary pattern may include forming a prism shape, a retroreflective shape, a polygonal shape, and the like by using vertical exposure and oblique exposure selectively. The method of claim 15, The body layer is a keypad manufacturing method for a mobile terminal, characterized in that formed by electroplating using the metal layer as a seed layer. The method of claim 15, The body layer keypad manufacturing method, characterized in that a plurality of molding patterns are formed to form a plurality of keypads at a time. The method according to claim 13 or 14, The stamper is formed with a plurality of molding patterns, And cutting the molded optical film by cutting the individual optical keypads. The method according to claim 13 or 14, The stamper mounting roller is bisected along the axial direction and one end portion of the cutting surface is hinged is composed of a first roller and a second roller that can be opened and retracted mutually, Mounting the stamper on the stamper mounting roller is fixed to the other end portion opposite the hinged side of the first roller and the second roller, respectively, while the first roller and the second roller are open. And after the first roller and the second roller are gathered together to achieve a combination such that the first roller and the second roller are unopened. The method according to claim 13 or 14, The optical film is made of PC (Polycarbonate) or PET (Polyethylene terephthalate). The method according to claim 13 or 14, The method of manufacturing a keypad for a mobile terminal, characterized in that the ultraviolet curable resin coated on the optical film is pressed to fill the cavity of the optical film. The method according to claim 13 or 14, The ultraviolet curable resin is a keypad manufacturing method for a mobile terminal, characterized in that the crosslinkable oligomeric resin containing hard and soft segments having a microstructured surface. The method of claim 23, wherein The oligomer resin is a keypad manufacturing method for a mobile terminal, characterized in that in the range of 1000 to 5000cps viscosity. The method according to claim 13 or 14, Method of manufacturing a keypad for a mobile terminal, characterized in that to form a reflective layer by vacuum deposition or sputtering on one side of the optical film in order to increase the reflectance by the fine projections and to give various optical effects. A cylindrical roller having a core insertion recess formed in the outer circumferential surface thereof; A stamper coupling core inserted into and seated in the core insertion recess; A keypad forming apparatus for a portable terminal, comprising a stamper having a molding pattern for molding a molded object and being in close contact with the outer surface of the stamper coupling core. The method of claim 26, The stamper coupling core has an outer surface having the same curvature as the outer circumferential surface of the cylindrical roller, and has a flat rectangular inner surface opposite to the outer surface, and in contact with the inner surface perpendicularly to the outer surface. Keypad molding apparatus for a mobile terminal, characterized in that it has a peripheral surface connected. The method of claim 26, The cylindrical roller is a keypad forming apparatus for a mobile terminal, characterized in that provided with a plurality of the core insertion groove. The method of claim 26, The stamper is a keypad forming apparatus for a mobile terminal, characterized in that coupled to the outer surface of the stamper coupling core by welding. A cylindrical roller having a plurality of cylindrical insertion grooves recessed in the outer circumferential surface thereof and formed in plural; It is inserted into the core insertion groove and seated, and a molding pattern for forming a molded object is formed on the outer surface, the outer surface is formed with the same curvature as the outer circumferential surface of the cylindrical roller, the inner of the flat square on the opposite side of the outer surface A core having a side surface, the core having a circumferential surface connected to the outer surface while being in direct contact with the inner surface; Keypad molding apparatus for a portable terminal comprising a. The method of claim 26 or 30, And an annular coupling ring for wrapping and pressing the cylindrical roller and the outer surface of the core inserted into the core insertion recess. The method of claim 26 or 30, Keypad forming apparatus for a mobile terminal, characterized in that it has a locking groove formed in the core insertion groove is formed deeper deeper in the corner of the core insertion groove so as not to catch the edge of the stamper coupling core is inserted into the core insertion groove. The method of claim 26 or 30, wherein the forming of the molding pattern, Forming a sacrificial film by applying a material to be removed in exposure to a forming pattern forming surface in a flat state before forming the forming pattern; Forming a photoresist layer by applying a first photosensitive agent and a second photosensitive agent, which are heterogeneous photoresists that are developed by different developer solutions, to the sacrificial film formed on the molding pattern forming surface; Placing a mask film on the photoresist layer and exposing the mask film to form a preliminary pattern for a molding pattern on the photoresist layer; Forming a metal layer on the photoresist layer on which the preliminary pattern is formed; Forming a body layer on the metal layer; Keypad molding apparatus for a mobile terminal, characterized in that through the step of separating the body layer. The method of claim 1, The stamper is a keypad forming apparatus for a mobile terminal, characterized in that attached to surround the outer peripheral surface of the roller.

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