KR100955691B1 - optical sheet and optical sheet manufacturing method - Google Patents

Abstract

In a personal handheld terminal including a plurality of buttons and a light source for providing light to the buttons, the waveguide for transmitting light from the light source to the plurality of buttons is provided on the light-transmitting film and the bottom of the light-transmitting film, and a scattering pattern corresponding to the button. It includes a wave guide pad including a. According to the waveguide, the brightness of the button by the light source can be improved, and the key feeling according to the user's pressing operation can be improved.

Waveguide. Floodlight, Scattering Patterns

Description

Optical sheet and optical sheet manufacturing method

The present invention relates to a waveguide and a method for manufacturing a waveguide sheet, and more particularly, to a waveguide and a waveguide sheet manufacturing method of providing a light-transmitting film on the waveguide to maintain a certain shape strength, improved brightness.

A personal portable terminal such as a mobile phone is provided with a keypad having an input button for inputting a transmission and reception state. A light emitting device for allowing a user to check an input button may be provided on the bottom of the keypad, and an LED or the like may be used as the light emitting device.

A waveguide sheet may be provided on the bottom of the keypad to efficiently light the light source of the light emitting device. The waveguide sheet is an optical film that minimizes light source loss by allowing the light source of the light emitting device on the bottom of the keypad to be constantly adjusted. Such a waveguide sheet may be formed using a PC film by injection molding or thermoforming using a mold, and the formed waveguide sheet may have a certain thickness and have considerable hardness in terms of PC film characteristics.

Therefore, when the user presses the input button, the key input sensitivity may be deteriorated due to the hardness of the waveguide, and the light-transmitting film made of PC or PET may not provide sufficient luminance as compared to other materials. As a result, there is a demand for a waveguide sheet which improves the user's key feeling and the brightness of the button according to the input button pressing operation.

The present invention provides a method of manufacturing a waveguide and a waveguide sheet in which light of a light source can be backlighted on a front surface of a keypad by minimizing the loss of a light source, and the brightness of a button is increased so that a button of the keypad can be recognized more accurately.

The present invention provides a thin and soft waveguide pad to provide a waveguide sheet and a waveguide sheet manufacturing method with improved key feel as a button is pressed.

According to an exemplary embodiment of the present invention, a waveguide for transmitting light from a light source to a plurality of buttons in a personal hand-held terminal including a plurality of buttons and a light source for providing light to the buttons, a light-transmitting film, and a light-transmitting film A wave pad is provided on the bottom and includes a scattering pattern corresponding to the button. The waveguide pad of the waveguide may be formed by pressing the light-transmissive resin, and the waveguide pad pressurized with the light-transmissive resin may improve brightness of a button of a PC or PET material than the waveguide. In addition, the light-transmitting resin has a soft property, so that the resistance to pressing can be minimized even when the button is pressed. Thus, the user can have a softer key feeling in the pressing operation.

When forming the waveguide pad, one side of the waveguide pad may be in contact with the light source, and the thickness of one side of the waveguide pad facing the light source may be thicker than the thickness inside the waveguide pad. The loss of light of the light source provided on the side of the waveguide pad thus formed can be minimized.

In general, since the thickness of the waveguide is thinner than the thickness of the light source, all of the light from the light source may not be delivered to the waveguide, and a leak may occur. As a result, the backlighting efficiency of the keypad may be reduced. Therefore, when one side of the waveguide is formed to the same thickness as the light source, the light emitted from the light source may be completely transmitted to the waveguide. Since the waveguide pad is formed by molding through a mold, the thickness of the waveguide pad can be easily adjusted, and the thickness adjustment and positional deformation of the waveguide pad can be easily performed.

In this case, the waveguide pad may be formed of a material that is relatively softer than the transparent film, and in particular, the waveguide pad may be formed of a liquid transparent resin by using a mold on the transparent film. Here, the liquid translucent resin may generally use liquid silicone, and in the embodiment of the present invention, for example, molded by using silicon, but alternatively, may be used as a material that can replace the soft material.

The waveguide pad may have a low hardness even after molding, thereby softening the user's pressing operation. The waveguide may be provided on the bottom of the keypad, which allows the user to enter letters or numbers by pressing a button on the keypad. Here, if the hardness of the waveguide pad is high, the force to press the keypad should be large, so that the user's keypad key feeling may be degraded. However, when the waveguide pad is formed of low hardness silicone as in the embodiment of the present invention, the force for pressing the keypad can be minimized. In particular, when a soft material such as silicon is used, the key feeling can be improved by the soft texture. Can be.

The light transmitting film may be a material having a predetermined hardness, such as PET, PC film. Since the liquid translucent resin has a low hardness even after molding, the waveguide pad can be supported and fixed by using a translucent film. In addition, when molding a liquid translucent resin using silicon, dust or foreign matter is adsorbed on the waveguide pad so that the light is not scattered efficiently, or it adheres to the bottom of the keypad so that the light of the light source cannot be transmitted and light leaks. Efficiency may be reduced. At this time, the light-transmitting film may block the adsorption of dust or foreign matter on the upper surface of the waveguide pad, and the back light of the keypad may be smoothed by suppressing adhesion to the bottom of the keypad.

Here, the scattering pattern of the waveguide may be formed by engraving, embossing or a combination thereof. The scattering pattern may be formed at a position corresponding to the button of the keypad, and the light irradiated from the light source may be scattered in the button so that the user may recognize the letters or numbers formed on the button more accurately. The scattering pattern may be formed in an intaglio, embossed or a combination thereof by using a mold molding or a laser, may be formed in the process of forming the waveguide sheet, or may be formed in a post-process after forming the waveguide sheet. .

When the waveguide is formed, a primer layer or an adhesive layer may be further formed between the waveguide pad and the light-transmitting film to further closely contact the waveguide pad and the light-transmitting film. Alternatively, a release film may be further provided on one side of the light-transmitting film. Since the thickness of the light-transmitting film is considerably thin, it may be difficult to handle such as spreading on a mold and applying a liquid light-transmitting resin thereon, and further providing a release film on the side. The transparent film can maintain the shape more smoothly. After the light-transmitting film including the release film is molded together with the waveguide pad, the release film may be separately removed on the light-transmitting film.

In addition, according to an exemplary embodiment of the present invention, a method for manufacturing a wave guide sheet for transmitting light from a light source to a plurality of buttons in a personal portable terminal comprising a plurality of buttons and a light source for providing light to the button, Providing a light transmitting film, providing a liquid light transmitting resin on the light transmitting film, pressing the liquid light transmitting resin to form a waveguide pad, and forming a scattering pattern corresponding to the button on the upper surface of the waveguide pad. Equipped. The waveguide of the waveguide sheet manufacturing method may be formed by pressing the light-transmissive resin, and the light-transmissive resin may be formed of a material that transmits light well and may improve brightness of a button. In addition, the light-transmissive resin has a soft property, so hardness may not be felt even when a button is pressed. Thus, the user can have a softer key feeling in the pressing operation.

A mold may be provided to manufacture the waveguide, and the waveguide may be formed by applying heat and pressure by providing a light-transmitting film and a liquid-transmissive resin on the mold. Here, the light-transmitting film may use plastic materials such as PET and PC. The light-transmitting film may prevent the foreign matter from adsorbing to the waveguide on the upper surface of the waveguide pad or the upper surface of the waveguide pad, and may prevent the bottom surface of the keypad from sticking to the upper surface of the waveguide pad. Therefore, it is preferable that the light transmitting film is formed to a very thin thickness capable of supporting the waveguide pad.

In addition, the liquid light-transmissive resin may generally use silicon, and when the waveguide pad is formed of silicon, it may be formed in a thin thickness, and the light of the light source may be easily transferred by the thin thickness, and the luminance may be increased. . Therefore, the letters or numbers on the keypad buttons can be recognized more accurately.

When the waveguide sheet is formed using a mold, the thickness of one side of the waveguide pad may be thicker than the thickness of the inside of the waveguide pad. One side of the thickly formed waveguide pad may be positioned to face the light source, and light of the light source may be irradiated onto the waveguide pad without leaking light, thereby minimizing light loss.

A scattering pattern may be formed on the upper surface of the formed waveguide sheet. The scattering pattern allows light from the light source to be scattered on the bottom of the button so that the letters or numbers of the button can be recognized more accurately. In this case, the scattering pattern may be formed to be engraved, embossed, or a combination thereof, and may be formed integrally with the waveguide using laser engraving or mold molding.

In addition, the pattern to be formed may be formed more densely than the pattern relatively far from the light source is relatively close to the light source. If the light intensity is large, the scattering action of the pattern can be active, it is possible to induce the same scattering action of each button with a difference in the pattern shape.

According to the waveguide and the waveguide sheet manufacturing method of the present invention, the light of the light source can be backlighted on the front surface of the keypad by minimizing the loss of the light source, and the brightness of the button may be increased to more accurately recognize the button of the keypad. The waveguide and the waveguide pad formed by the method of manufacturing the waveguide sheet according to the present invention may be formed such that one side thereof is thicker than the inner side and the other side thereof, and the thickened waveguide pad and the light source face each other. Since light of the light source may be irradiated with a thickly formed waveguide pad, the brightness of the keypad may be increased by minimizing light loss.

According to the waveguide and the waveguide sheet manufacturing method of the present invention, by providing a soft waveguide pad, the key feeling can be further improved by pressing a button. The waveguide pad of the waveguide can be formed using a liquid translucent resin, and can be formed in a very thin thickness. In addition, since the liquid light-transmitting resin has a soft property, the pressing operation of the button may be smoother.

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments. For reference, in the present description, the same numbers refer to substantially the same elements, and may be described by quoting the contents described in other drawings under the above rules, and the contents repeated or deemed apparent to those skilled in the art may be omitted.

1 is an exploded perspective view showing a personal portable terminal equipped with a waveguide of the present invention, Figure 2 is a plan view showing a waveguide of the present invention, Figure 3 is a cross-sectional view taken along the line I-I of FIG.

Prior to the description of the present invention, in the present specification, a personal portable device (Personal Portable Device) refers to a portable electronic device such as a PDA (Personal Digital Assistant), a smart phone, a handheld PC, a mobile phone, an MP3 player, or the like. An electronic device, which may include a predetermined communication module such as a code division multiplexing access (CDMA) module, a Bluetooth module, an infrared communication module (IrDA), a wired / wireless LAN card, and has a predetermined microprocessor for performing a multimedia playback function. By doing so, it can be used as a concept of collectively a terminal having a predetermined computing power. In addition, in addition to the structure consisting of the dome switch and the electrode, the keypad may be selected according to the applied technology level, and may be changed to suit the terminal.

1 to 3, the personal portable terminal 100 includes a front body 120, a keypad 140, a dome switch board 160, and a rear body 180. The keypad 140 and the dome switch board 160 may be mounted in the front and rear bodies 120 and 180, and the keypad 140 may be exposed to the outside through the keypad hole 150 of the front body 120.

In general, the personal mobile terminal 100 may include a component and a circuit configuration for implementing a terminal function. For example, a mobile phone may include a display module, a wireless transmission / reception module, a microphone, a battery, and the like inside the main body. In addition, although the personal portable terminal 100 of FIG. 1 has a structure of opening and closing in a folder manner, the personal portable terminal according to another embodiment of the present invention may be provided in a slide method, a bar method, and the like.

The keypad 140 may be provided with a button 142 that allows a user to press the button 142, and the button 142 may be formed by printing, indexing, or the like. For example, the button 142 may attach a film on which letters or numbers are printed, and may index letters or numbers on a hard material such as a metal sheet. In addition, each button may be attached using a flat plate made of a rubber material so that the button may protrude to the upper surface of the keypad. In the present invention, the buttons may be formed according to the conditions, design specifications, and the like required by the present invention.

A waveguide 200 may be provided on the bottom of the keypad 140, and the waveguide 200 may include a waveguide pad 220 and a light-transmitting film 240. In addition, the dome switch board 160 may be positioned on the bottom of the waveguide sheet 200, and the dome switch board 160 may include a light source for irradiating light to the waveguide sheet 200.

In general, since the thickness of the light source 162 is thicker than the thickness of the waveguide pad 220, all of the light emitted from the light source 162 may not be transmitted to the waveguide pad 220. Backlighting efficiency may be degraded. In order to minimize the loss of light, it is effective that a part of the thickness of the waveguide pad 220 in contact with the light source 162 is equal to or thicker than the thickness of the light source 162. In addition, a thick side surface of the waveguide pad 220 may be formed at a position where the light source 162 is provided. In this case, the light source 162 may be generally used a light emitting diode (LED), the LED may have a thickness of about 0.3mm ~ 0.5mm. In order to minimize the loss of light of the light source 162, it is preferable that the thick side surface of the waveguide pad 220 is formed to have the same thickness as that of the light source 162.

The light of the light source 162 may be completely transmitted through the thick side surface of the waveguide pad 220, which is formed to have the same thickness as the light source 162. Therefore, the brightness of the bottom surface of the keypad 140 may be increased to increase the brightness of the button.

In addition, the waveguide pad 220 may be provided using a soft material such as liquid transparent resin, for example, liquid silicone, liquid urethane, and the like, and the liquid transparent resin may be cured by heat or pressure. . Hereinafter, the present invention will be described in the case where the waveguide pad 220 is formed of silicon, for example, and the upper surface of the waveguide pad 220 formed of silicon is adsorbed with light or by adhering to the bottom surface of the keypad 140. This may cause a leak. In this case, the light transmitting film 240, which will be described later, may be provided on the upper surface of the waveguide pad 220 to prevent dust from adsorbing on the waveguide pad 220 and to be in close contact with the bottom surface of the keypad 140.

In addition, since the waveguide pad 220 is a soft material, a relatively large force is not required when the user presses the button 142. Therefore, the user may have an improved key feeling because the key feeling of pressing the button 142 may be relatively soft.

The light transmitting film 240 may be provided on the upper surface of the waveguide pad 220. As described above, the light-transmitting film 240 may prevent dust or foreign matter from adsorbing on the upper surface of the waveguide pad 220 and prevent the waveguide pad 220 from coming into close contact with the bottom surface of the keypad 140.

The light transmitting film 240 may be formed of, for example, a plastic material such as PET or PC, and may be formed of a transparent material to pass the light of the light source 162. In general, the light-transmitting film 240 provided in PET and PC may maintain the shape of the waveguide pad 220 because it maintains a relatively higher intensity than the waveguide pad 220. The transparent film 240 may be formed to a very thin thickness here. For example, the light-transmitting film 240 may be formed to a thickness within 0.01mm ~ 0.05mm, and has a predetermined strength in the characteristics of the material, but formed to a thickness such that the hardness is not felt when pressing the button 142 It is desirable to be.

When the light transmissive film 240 is provided, an adhesive layer, a primer layer, or the like may be further provided between the waveguide pad 220 and the light transmissive film 240. The adhesive layer, the primer layer, and the like may allow the waveguide pad 220 and the light transmitting film 240 to be more firmly fixed.

The scattering pattern 260 may be formed on the waveguide pad 220. The scattering pattern 260 may be formed in an area corresponding to the area of the button 142. The scattering pattern 260 may serve to scatter light emitted from the light source 162. The light source 162 should be able to recognize letters or numbers on the button 142, and as a result, the scattering pattern 260 is formed in an area corresponding to the position of the button 142 so that light may be scattered at the position of the button 142. To be able.

The scattering pattern 260 may be formed in an intaglio, an embossed shape, or a combination thereof. In particular, the scattering pattern 260 may be formed closer to the light source 162 than the scattering pattern 260 formed relatively close to the light source 162.

When the scattering pattern 260 is densely formed, the scattering action may be more active than the scattering pattern 260 that is not densely formed, and the scattering action may be active closer to the light source 162. Accordingly, the scattering pattern 260 disposed relatively far from the light source 162 may be densely formed to scatter scattered light more efficiently.

4 and 5 are cross-sectional views illustrating embodiments of scattering patterns.

4 and 5, the scattering pattern 260 may be formed by embossing, engraving, or a combination thereof. In the embodiment of the present invention, the embossed pattern may mean that the pattern is formed to protrude to the upper surface of the waveguide pad 220. The engraved pattern may mean that the pattern is formed to protrude to the bottom of the waveguide pad. Can be. In the following description, the scattering pattern 260 protrudes to the bottom surface of the waveguide pad 220. For example, the scattering pattern may be changed according to the conditions required by the present invention. As described above, the scattering pattern 260 scatters the light of the light source 162 at the position of the button 142 to increase the backlighting effect of the keypad 140.

In addition, the scattering pattern 260 may be formed on the waveguide pad 220, and in some cases, both the light transmitting film 240 and the waveguide pad 220 may be formed. Since the scattering pattern 260 scatters the light irradiated onto the waveguide pad 220, the scattering pattern 260 may not be smoothly scattered when the scattering pattern 260 is formed only on the transparent film 240. Therefore, it is preferable that the scattering pattern 260 is formed on the waveguide pad 220, and the shape in which the scattering pattern 260 is formed, the position where the scattering pattern 260 is formed, and the like are not limited or limited to the present invention.

In addition, the scattering patterns 260a and 260b may have different densities of scattering patterns according to positions of light sources. Referring back to FIG. 2, the density of the scattering pattern 260 may confirm the difference. As described above, in the case of the scattering pattern close to the light source, the scattering pattern disposed far from the light source may be denser for the same scattering effect as the scattering pattern far from the light source. In this case, the scattering pattern may be changed according to the position of the light source disposed, and the position of the light source may also be changed according to the demand of the invention.

On the other hand, Figure 6 is a cross-sectional view for explaining the manufacturing method of the wave guide sheet according to an embodiment of the present invention, Figure 7 is a flow chart for explaining the wave guide sheet manufacturing method according to an embodiment of the present invention.

6 and 7, the method for manufacturing a waveguide sheet includes providing a light transmitting film (S710), providing a liquid light transmitting resin on the light transmitting film (S720), and pressing the liquid light transmitting resin to pressurize the waveguide pad. Forming (S730), forming a scattering pattern corresponding to the button on the upper surface of the waveguide pad (S740).

 In order to manufacture the waveguide 200, an upper mold 30 and a lower mold 70 are provided. The upper mold 30 is liftably positioned on the lower mold 70, and includes a groove for forming a plurality of push protrusions 222. The manufacturing method according to the present embodiment describes an example in which the pressing protrusion is integrally formed, but the pressing protrusion may be provided separately without being integrally formed with the waveguide sheet. In addition, the upper and lower positions of the upper mold and the lower mold may be changed.

On the lower mold 70, a light transmitting film 240 and a liquid light transmitting resin 320 are sequentially provided (S710 and S720). Transmissive film 240 may be provided with a plastic film, it may be provided in a thickness of 0.01mm ~ 0.05mm made of a material such as PET, PC.

In this embodiment, for example, the liquid light-transmissive resin 320 is sequentially provided on the light-transmitting film 240, but in some cases, a primer layer or an adhesive layer is further formed on the light-transmitting film 240, the cured waveguide pad It may be to be in close contact with the 220.

The upper mold 30 is lowered to apply heat and pressure to the light transmitting film 240 and the liquid light transmitting resin 320 together with the lower mold 70. The liquid translucent resin 320 is converted into a silicon sheet by heat and pressure, at which time the waveguide pad 220 may be molded (S730). In addition, the upper mold 30 has a groove so that the pressing protrusion 222 may be integrally formed with the waveguide pad 220. In addition, a thickness of one side of the waveguide pad 220 may be thicker than a thickness of the inside of the waveguide pad 220, and one side of the thickly formed waveguide pad 220 may face the light source 162 to be described later.

The liquid translucent resin 320 may generally be provided with liquid silicone, or alternatively, a material that may replace silicone such as urethane may be used. Hereinafter, the embodiment of the present invention will be described with an example formed of silicon. The waveguide pad 220 formed of silicon has a problem in that dust may be adsorbed on the upper surface and the light of the light source is easily leaked by being in close contact with the bottom surface of the keypad 140. Therefore, by providing a light-transmitting film 240 of a plastic material on the upper surface of the waveguide pad 220, it is possible to prevent dust from adsorbed on the upper surface of the waveguide pad 220, the light is in close contact with the bottom of the keypad to leak light from an unintended position You can prevent it from going out. In addition, since the waveguide pad 220 is thin in thickness and soft in nature, when the user presses the button 142, the waveguide pad 220 may press the button 142 with little force, thereby improving the feeling of the key.

 Referring back to FIG. 6, after the waveguide sheet 200 is separated from the molds 30 and 70, the scattering pattern 260 may be formed (S740). The scattering pattern 260 may be formed using a laser, or may be formed in a process of forming a waveguide sheet 200 by forming a pattern on a mold. In the exemplary embodiment of the present invention, the scattering pattern 260 is formed through laser engraving, and may be formed to be engraved, embossed, or a combination thereof.

The scattering pattern 260 may be formed at a position corresponding to the button 142. In the scattering pattern 260, the light of the light source 162 is scattered to view letters or numbers formed at the button 142 at night. Make sure it is recognized correctly.

In addition, the pattern to be formed may be formed more densely than the pattern relatively far from the light source 162 is relatively close to the light source 162. If the light intensity is large, the scattering action of the pattern may be active, so that the same scattering action of each button 142 may be induced with a difference in the pattern shape.

8 is a cross-sectional view for explaining a modification of the keypad manufacturing method according to an embodiment of the present invention.

Referring to FIG. 8, the keypad 140 according to the present exemplary embodiment may further include a release film 280 on an upper surface of the light transmitting film 240. Since the release film 280 is generally very thin in thickness, the release film 280 may provide the release film 280 on one surface of the transparent film 240 to support the transparent film 240.

The release film 280 is provided in a state in which the light transmitting film 240 is laminated on the release film 280 in the step (S710) providing a light transmitting film 240, when the waveguide pad 220 is formed a release film ( 280 may be removed on the light transmitting film 240. In this case, the release film 280 may be formed by applying a UV curable material on the light-transmitting film 240 and then exposing the UV curable material to ultraviolet rays. It may be formed.

The transparent film 240 having the release film 280 attached thereto is disposed on the lower mold 70, and the liquid light-transmissive resin 320 is provided on the transparent film 240 to provide heat and heat using the upper mold 30. When the pressure is applied, the waveguide 200 including the light transmitting film 240 and the release film 280 may be formed.

The release film 280 attached to the upper surface of the formed waveguide 200 may be removed. In this case, the release film 280 may be easily removed from the transmissive film 240 by preventing the adhesion or adhesion between the release film 280 and the transmissive film 240.

The scattering pattern 260 may be formed on the waveguide pad 220 from which the release film 280 is removed, and the scattering pattern 260 may be formed along with the waveguide 200 by laser engraving or mold injection as described above. have.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is an exploded perspective view showing a personal portable terminal with a wave guide sheet of the present invention.

2 is a plan view showing a waveguide of the present invention.

3 is a cross-sectional view taken along the line II of FIG. 1.

4 and 5 are cross-sectional views illustrating embodiments of scattering patterns.

6 is a cross-sectional view illustrating a method of manufacturing a waveguide according to an embodiment of the present invention.

7 is a flowchart illustrating a waveguide manufacturing method according to an embodiment of the present invention.

9 is a cross-sectional view for explaining a modification of the keypad manufacturing method according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: personal portable terminal 140: keypad

142: button 160: dome switch board

162: light source 200: waveguide

220: waveguide pad 240: light-transmitting film

260: scattering pattern

Claims (14)

In the wave guide sheet for transmitting the light from the light source to the plurality of buttons in a personal portable device comprising a plurality of buttons and a light source for providing light to the button, Light transmitting film; And Liquid translucent silicon is directly applied on the light-transmitting film and then provided to the bottom of the light-transmitting film through a process of molding using a mold. A waveguide pattern including a scattering pattern corresponding to the button, the light source is in contact with the light source side, the thickness of one side facing the light source is formed thicker than the thickness of the inside, and the wave guide pad is formed of a relatively soft material than the light emitting film ; And a release film is further provided on an upper surface of the light-transmitting film, wherein the release film is removed from the light-transmitting film after the light-transmitting film and the waveguide pad are in close contact with each other. delete delete delete delete The method of claim 1, The light-transmitting film is formed using a PC, PET film, the waveguide, characterized in that provided on the waveguide pad. The method of claim 6, The transmissive film is a wave guide sheet, characterized in that formed in a thickness of 0.01 ~ 0.05mm. The method of claim 1, The scattering pattern is a waveguide, characterized in that formed in the intaglio, embossed or a combination thereof. The method of claim 1, A waveguide sheet further comprising a primer layer or an adhesive layer formed between the waveguide pad and the light transmitting film. delete In the method of manufacturing a wave guide sheet for transmitting the light from the light source to the plurality of buttons in a personal portable device comprising a plurality of buttons and a light source for providing light to the button, Providing a light-transmitting film so as to be laminated on the release film; Providing a liquid light transmitting resin on the light transmitting film; Pressing the liquid light-transmissive resin to form a waveguide pad formed with a thickness of one side corresponding to the light source thicker than an internal thickness and formed of a material that is relatively softer than the light-transmitting film; And Forming a scattering pattern corresponding to the button on the waveguide; And removing the release film on the light-transmitting film after forming the waveguide pad. delete delete The method of claim 11, After coating the UV curable material on the light-transmitting film, the UV curable material is exposed to ultraviolet light to form the release film characterized in that the release film.

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