KR200386686Y1 - a multi layer printed keypad - Google Patents

a multi layer printed keypad Download PDF

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Publication number
KR200386686Y1
KR200386686Y1 KR20-2005-0008005U KR20050008005U KR200386686Y1 KR 200386686 Y1 KR200386686 Y1 KR 200386686Y1 KR 20050008005 U KR20050008005 U KR 20050008005U KR 200386686 Y1 KR200386686 Y1 KR 200386686Y1
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KR
South Korea
Prior art keywords
keypad
key top
pad base
actuator
resin film
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KR20-2005-0008005U
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Korean (ko)
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김태근
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주식회사 두성테크
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/704—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by the layers, e.g. by their material or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/705—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/02—UV or light sensitive

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  • Manufacture Of Switches (AREA)
  • Push-Button Switches (AREA)

Abstract

본 고안은 휴대폰을 비롯한 각종 전자통신기기의 입력장치에 주로 사용되는 키패드에 관한 것으로, 종래의 키패드(20)는 각기 다른 금형으로 합성수지 키탑(22)과 우레탄 패드베이스(21), 액츄레이터(23)를 성형하기 때문에 금형비용 및 제작비용이 많이 들게 될 뿐 아니라 다수의 합성수지 키탑(22)을 우레탄 패드베이스(21)에 정밀하게 접착하는 공정을 비롯한 제조공정수가 많고 작업이 매우 번거롭게 되어 제조과정에서의 불량률이 매우 높게 되고, 두께가 두꺼운 합성수지 키탑을 사용하기 때문에 전체 두께가 비교적 두껍게 되어 이를 사용하는 휴대폰 등의 전자통신기기의 슬림화에 나쁜 영향을 미치게 되는 문제가 있었던 바, The present invention relates to a keypad mainly used in the input device of various electronic communication devices, including a mobile phone, the conventional keypad 20 is a plastic key top 22, urethane pad base 21, actuator 23 in different molds ), The mold cost and manufacturing cost are high, and the number of manufacturing processes, including the process of precisely bonding a plurality of synthetic resin key tops 22 to the urethane pad base 21, is very cumbersome, The failure rate of the very high, because the thick synthetic resin key top is used, the overall thickness is relatively thick, which has a problem that adversely affect the slimming of electronic communication devices such as mobile phones,

내열성수지필름으로 제작되는 패드베이스(11)의 표면에 UV경화형 페이스트(Pastes))로 적층 스크린 인쇄를 실시하여 키탑(12)을 형성하는 동시에 키탑(12)에 문자 및 색상을 구현하고, 상기 내열성수지필름 패드베이스(11)의 이면에 돔스위치(14)를 클릭할 수 있도록 하는 액츄레이터(13)를 형성하는 것을 특징으로 하는 본 고안에 의하면 적은 인력과 비용으로 키패드(10)를 간편하게 대량 생산할 수 있게 되고 불량률을 대폭 저감시킬 수 있게 되므로 키패드 생산성을 크게 향상시킬 수 있게 됨은 물론 제작원가를 크게 절감할 수 있게 되고, 별도로 사출 성형한 두꺼운 합성수지재 키탑을 사용하는 종래의 키패드에 비해 현저하게 얇은 두께로 제작할 수 있게 되므로 휴대폰을 비롯한 각종 전자 통신기기의 슬림화에 크게 기여할 수 있게 되는 등의 효과를 얻을 수 있게 된다.Laminate screen printing is performed on the surface of the pad base 11 made of a heat resistant resin film using UV curing pastes to form the key top 12, and at the same time, implement the letters and colors on the key top 12. According to the present invention, the actuator 13 is formed on the back surface of the resin film pad base 11 so that the dome switch 14 can be clicked. As a result, the defect rate can be greatly reduced, and the keypad productivity can be greatly improved, and the manufacturing cost can be greatly reduced, and it is remarkably thinner than the conventional keypad using a thick injection-molded key top separately injected. Since it can be manufactured in thickness, it can contribute to the slimming of various electronic communication devices including mobile phones. It is possible.

Description

적층인쇄 키패드 { a multi layer printed keypad }Laminated keypad {a multi layer printed keypad}

본 고안은 휴대폰을 비롯한 각종 전자통신기기의 입력장치에 주로 사용되는 키패드에 관한 것으로, 더 자세하게는 내열성수지필름의 패드베이스의 표면에 적층 스크린 인쇄로 키탑을 형성하고 그 이면에 적층 스크린 인쇄 또는 디스펜서(Dispenser)를 이용하여 액츄레이터를 형성하는 적층인쇄 키패드에 관한 것이다.The present invention relates to a keypad mainly used for input devices of various electronic communication devices including a mobile phone, and more specifically, to form a key top by laminated screen printing on the surface of the pad base of the heat-resistant resin film, and laminated screen printing or dispenser The present invention relates to a multilayer printed keypad for forming an actuator using a dispenser.

본 고안은 휴대폰을 비롯한 각종 전자통신기기의 입력장치에 사용되는 키패드에 관계하는 것으로, 종래에 있어서 이러한 키패드는 도 5 및 도 6과 같이 우레탄재질의 패드베이스(21)의 표면에 사출 성형 및 스프레이 도장, 문자부위 레이저 마킹을 실시한 일정 두께의 합성수지 키탑(22)을 접착 설치하고, 패드베이스(21)의 이면에 실리콘을 토출하여 돔스위치(24)를 클릭할 수 있도록 하는 액츄레이터(23)를 형성한 것이 주로 사용되었다.The present invention relates to a keypad used for input devices of various electronic communication devices including a mobile phone. In the related art, such a keypad is injection molded and sprayed on the surface of a pad base 21 made of urethane material as shown in FIGS. 5 and 6. An actuator 23 is formed by adhesively installing a synthetic resin key top 22 of a predetermined thickness, which is coated with a laser marking on a character part, and discharging silicon on the back surface of the pad base 21 so that the dome switch 24 can be clicked. What was formed was mainly used.

상기 종래의 키패드(20)는 질감이 좋고 형상이 고급스럽기는 하지만 각기 다른 금형으로 합성수지 키탑(22)과 우레탄 패드베이스(21), 액츄레이터(23)를 성형하기 때문에 금형비용 및 제작비용이 많이 들게 될 뿐 아니라 다수의 합성수지 키탑(22)을 우레탄 패드베이스(21)에 정밀하게 접착하는 공정을 비롯한 제조공정수가 많고 작업이 매우 번거롭게 되며, 제조과정에서의 불량률도 매우 높게 되고, 두께가 두꺼운 합성수지 키탑(22)을 사용하기 때문에 전체 두께가 최소 1.50mm 이상으로 비교적 두껍게 되어 이를 사용하는 휴대폰 등의 전자통신기기의 슬림화에 나쁜 영향을 미치게 되는 문제가 있었다.Although the conventional keypad 20 has a good texture and a high-quality shape, since the resin key top 22, the urethane pad base 21, and the actuator 23 are formed by different molds, the mold cost and manufacturing cost are high. In addition, the number of manufacturing processes, including the process of precisely bonding the plurality of synthetic resin key tops 22 to the urethane pad base 21, is very cumbersome, and the defect rate in the manufacturing process is very high, and the thick synthetic resin key tops are thick. Because of the use of (22), the overall thickness becomes relatively thick, at least 1.50 mm or more, which has a problem of adversely affecting the slimming of electronic communication devices such as mobile phones using the same.

본 고안은 상기와 같은 종래의 실정을 감안하여 안출한 것이며, 그 목적이 휴대폰 및 각종 전자통신기기의 입력장치에 사용되는 키패드를 보다 간편하고 저렴하게 제작할 수 있도록 하여 생산성 향상과 제작비용의 절감을 도모할 수 있도록 함은 물론 보다 얇은 0.20~0.50㎜의 두께로 제작할 수 있도록 하여 휴대폰 등의 전자통신기기의 슬림화에 기여할 수 있도록 하는 적층인쇄 키패드를 제공하는 데에 있는 것이다.The present invention is conceived in view of the conventional situation as described above, the purpose is to make the keypad used for the input device of mobile phones and various electronic communication devices more easily and inexpensively to improve productivity and reduce the production cost It is to provide a multilayer printed keypad that can contribute to the slimming of electronic communication devices such as mobile phones by making it possible to manufacture a thinner thickness of 0.20 ~ 0.50㎜.

본 고안은 상기의 목적을 달성하기 위하여 내열성수지필름 패드베이스의 표면에 UV경화형 페이스트(Pastes)로 적층인쇄 키탑을 형성하는 동시에 키탑에 문자 및 색상을 구현하고, 내열성수지필름 패드베이스의 이면에 돔스위치를 클릭할 수 있도록 UV경화형 페이스트(Pastes)로 적층인쇄 액츄레이터를 형성하거나 디스펜서(Dispenser)를 이용하여 액츄레이터를 형성하는 것을 특징으로 하며, 이하 그 구체적인 기술내용을 첨부도면에 의거하여 더욱 자세히 설명하면 다음과 같다.In order to achieve the above object, the present invention forms a laminated printed key top with UV-curable pastes on the surface of the heat resistant resin film pad base, and realizes letters and colors on the key top, and a dome is formed on the back of the heat resistant resin film pad base It is characterized by forming a laminated printing actuator with UV-curable pastes or forming an actuator using a dispenser so that the switch can be clicked. The explanation is as follows.

즉, 도 1에는 본 고안의 한 실시예의 사시도가 도시되어 있고, 도 2에는 동 실시예의 표면도가 도시되어 있으며, 도 3에는 동 실시예의 요부 종단면도가 도시되어 있는 바, 본 고안의 적층인쇄 키패드(10)는 폴리에틸렌테레프탈레이트(PET), 폴리카보네이트(PC), 폴리에테르술폰(PES) 등의 내열성수지필름으로 제작되는 패드베이스(11)의 표면에 우레탄계열, 실리콘계열, 에폭시계열, 아크릴계열 등의 UV경화형 페이스트(Pastes)로 적층 스크린 인쇄를 실시하여 키탑(12)을 형성하는 동시에 키탑(12)에 문자 및 색상을 구현하고, 상기 내열성수지필름 패드베이스(11)의 이면에 UV경화형 페이스트(Pastes)로 적층 스크린 인쇄를 실시하여 돔스위치(14)를 클릭할 수 있도록 하는 액츄레이터(13)를 형성하거나 디스펜서(Dispenser)를 이용하여 액츄레이터(13)를 형성하여서 되는 것이다.That is, Fig. 1 shows a perspective view of one embodiment of the present invention, Fig. 2 shows a surface view of the embodiment, and Fig. 3 shows a longitudinal cross-sectional view of the main part of the present invention. The keypad 10 is urethane, silicone, epoxy, acrylic on the surface of the pad base 11 made of heat resistant resin film such as polyethylene terephthalate (PET), polycarbonate (PC), polyether sulfone (PES), etc. Laminated screen printing with UV-curable pastes such as series to form the key top 12 and at the same time embody the characters and colors on the key top 12, UV-curable on the back of the heat-resistant resin film pad base 11 By forming an actuator 13 that allows the dome switch 14 to be clicked by performing lamination screen printing with pastes or by forming an actuator 13 by using a dispenser to be.

본 고안에 있어서 키탑(12)에 문자 및 색상을 구현하는 방법은 스크린 인쇄를 통한 방법과 기존 스프레이 도장, 문자부위 레이저 마킹 방법이 모두 사용 가능하다.In the present invention, the method of implementing characters and colors on the key top 12 may be used by screen printing, conventional spray coating, and laser marking of character parts.

한편 도 4에는 본 고안의 한 실시예의 제조공정을 나타낸 요부 종단면도가 도시되어 있는 바, 본 고안의 적층인쇄 키패드(10)는 75~200㎛ 두께의 폴리에틸렌테레프탈레이트(PET), 폴리카보네이트(PC), 폴리에테르술폰(PES) 등의 내열성수지필름으로 패드베이스(11)를 형성하는 패드베이스 형성공정; 상기 내열성수지필름 패드베이스(11)의 표면에 우레탄계열, 실리콘계열, 에폭시계열, 아크릴계열 등의 UV경화형 페이스트(Pastes)로 4~10회의 적층 스크린 인쇄를 실시하여 최초 두께 0.05~0.08㎜의 1차 키탑(12a)의 형상을 형성하고 이후 3~9회의 추가 스크린 인쇄를 실시하여 2,3,4차 키탑(12b,12c,12d)을 형성함으로써 두께 0.20~0.50㎜의 최종 키탑(12)을 형성하는 동시에 키탑(12)에 문자나 색상을 구현하는 키탑 형성공정; 상기 내열성수지필름 패드베이스(11)의 이면에 실리콘계 UV경화형 페이스트(Pastes)로 3~6회의 적층 스크린 인쇄를 실시하여 돔스위치(14)를 클릭할 수 있도록 높이 0.15~0.30㎜, 직경 1.0~2.0㎜의 인쇄 액츄레이터(13)를 형성하거나 디스펜서(Dispenser)를 이용하여 높이 0.15~0.3㎜, 직경 1.0~2.0㎜의 도트(Dot) 액츄레이터(13)를 형성하는 액츄레이터 형성공정; 으로 이루어지는 제조방법 등을 통해 제조할 수 있다.On the other hand Figure 4 is a main longitudinal cross-sectional view showing a manufacturing process of one embodiment of the present invention, the laminated keypad 10 of the present invention is 75 ~ 200㎛ thickness polyethylene terephthalate (PET), polycarbonate (PC ), A pad base forming step of forming a pad base 11 from a heat resistant resin film such as polyether sulfone (PES); The surface of the heat-resistant resin film pad base 11 is subjected to 4-10 times of laminated screen printing with UV-curable pastes such as urethane, silicone, epoxy, acrylic, and the like, and has an initial thickness of 0.05 to 0.08 mm. The final key top 12 having a thickness of 0.20 to 0.50 mm is formed by forming the shape of the car key top 12a and then performing additional screen printing three to nine times to form second, third and fourth key tops 12b, 12c, and 12d. A key top forming step of forming a letter or color on the key top 12 at the same time; The back surface of the heat-resistant resin film pad base 11 is subjected to three to six laminated screen printing with silicone-based UV curing pastes, so that the dome switch 14 can be clicked and has a height of 0.15 to 0.30 mm and a diameter of 1.0 to 2.0. An actuator forming step of forming a print actuator 13 having a mm or a dot actuator 13 having a height of 0.15 to 0.3 mm and a diameter of 1.0 to 2.0 mm using a dispenser; It can be produced through a manufacturing method consisting of.

도면부호중 미설명부호 15 및 25는 인쇄회로기판이다.Reference numerals 15 and 25 in the drawings denote printed circuit boards.

상기와 같이 구성된 본 고안에 있어서는 전술한 종래의 키패드(20)와 같이 별도로 사출 성형한 키탑(22)을 별도로 성형한 패드베이스(21)에 접착하는 것이 아니라 내열성수지필름 패드베이스(11)의 표면과 이면에 적층 스크린 인쇄공법으로 키탑(12)과 액츄레이터(13)를 형성하는 것으로, 키탑 사출금형 및 패드가공금형, 부품 조립금형 등 다수의 금형을 필요로 하는 종래의 키패드에 비해 패드베이스 외곽가공금형 하나만을 구비하면 되므로 금형비용을 크게 절감할 수 있게 되며, 전체 제작공정이 간단하여 적은 인력으로 대량생산이 가능하므로 제작인력과 제작비용을 크게 절감할 수 있게 됨은 물론 불량률도 현저하게 저감할 수 있게 된다.In the present invention configured as described above, the surface of the heat-resistant resin film pad base 11 is not bonded to the pad base 21 separately molded by injection molding the key top 22 separately as in the above-described conventional keypad 20. By forming the key top 12 and the actuator 13 by the laminated screen printing method on the back and the back side, the pad base is more than the conventional keypad which requires a plurality of molds such as a key top injection mold, a pad processing mold, and a component assembly mold. Since only one mold is required, the mold cost can be greatly reduced, and the entire manufacturing process is simple, so that mass production is possible with a small number of personnel, which greatly reduces manufacturing manpower and manufacturing cost, and also significantly reduces the defective rate. It becomes possible.

또한 본 고안에 있어서는 전술한 종래의 키패드(20)보다 전체 두께를 현저하게 얇게 할 수 있게 되므로 휴대폰을 비롯한 각종 전자 통신기기의 슬림화에 크게 기여할 수 있게 된다. In addition, in the present invention, since the overall thickness can be remarkably thinner than the conventional keypad 20 described above, it can greatly contribute to slimming of various electronic communication devices including a mobile phone.

이상에서 설명한 바와 같이 본 고안은 내열성수지필름 패드베이스(11)의 표면과 이면에 UV경화형 페이스트(Pastes)로 인쇄를 실시하여 키탑(12)과 액츄레이터(13)를 형성한 것으로, 본 고안에 의하면 적은 인력과 비용으로 키패드(10)를 간편하게 대량 생산할 수 있게 되고 불량률을 대폭 저감시킬 수 있게 되므로 키패드 생산성을 크게 향상시킬 수 있게 됨은 물론 제작원가를 크게 절감할 수 있게 되고, 별도로 사출 성형한 두꺼운 합성수지재 키탑을 사용하는 종래의 키패드에 비해 현저하게 얇은 0.20~0.50㎜의 두께로 제작할 수 있게 되므로 휴대폰을 비롯한 각종 전자 통신기기의 슬림화에 크게 기여할 수 있게 되는 등의 효과를 얻을 수 있게 된다.As described above, the present invention is to form the key top 12 and the actuator 13 by printing with UV-curable pastes on the front and rear surfaces of the heat resistant resin film pad base 11. According to this method, the keypad 10 can be easily mass-produced with a small manpower and a cost, and the defect rate can be greatly reduced, thereby greatly improving the productivity of the keypad and significantly reducing the manufacturing cost. Compared to the conventional keypad using a synthetic resin keytop, it can be manufactured with a thickness of 0.20 to 0.50 mm, which is remarkably thin, thereby making it possible to greatly contribute to slimming of various electronic communication devices including a mobile phone.

도 1은 본 고안의 한 실시예의 사시도1 is a perspective view of one embodiment of the present invention

도 2는 동 실시예의 표면도2 is a surface view of the embodiment

도 3은 동 실시예의 요부 종단면도3 is a longitudinal sectional view showing main parts of the embodiment;

도 4는 동 실시예의 각 제조공정을 나타낸 요부 종단면도4 is a longitudinal sectional view showing main parts of the manufacturing processes of the embodiment;

도 5는 종래 키패드의 분해사시도5 is an exploded perspective view of a conventional keypad

도 6은 종래 키패드의 요부 분해 종단면도6 is an exploded longitudinal cross-sectional view of the main part of the conventional keypad.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

10 : 적층인쇄 키패드 11 : 내열성수지필름 패드베이스10: laminated printing keypad 11: heat-resistant resin film pad base

12 : 키탑 13 : 액츄레이터12: key top 13: actuator

14 : 돔스위치14: dome switch

Claims (3)

폴리에틸렌테레프탈레이트(PET), 폴리카보네이트(PC), 폴리에테르술폰(PES)등의 내열성수지필름으로 제작되는 패드베이스(11)의 표면에 우레탄계열, 실리콘계열, 에폭시계열, 아크릴계열 등의 UV경화형 페이스트(Pastes)로 다수회의 적층 스크린 인쇄를 실시하여 키탑(12)을 형성하는 동시에 키탑(12)에 문자 및 색상을 구현하고, 상기 내열성수지필름 패드베이스(11)의 이면에 돔스위치(14)를 클릭할 수 있도록 하는 액츄레이터(13)를 형성한 것을 특징으로 하는 적층인쇄 키패드.UV curing type such as urethane, silicone, epoxy, acrylic, etc. on the surface of the pad base 11 made of heat resistant resin film such as polyethylene terephthalate (PET), polycarbonate (PC), polyether sulfone (PES), etc. A plurality of laminated screen printings are performed with pastes to form the key top 12 and at the same time implement letters and colors on the key top 12, and a dome switch 14 on the back surface of the heat resistant resin film pad base 11. A laminated printing keypad characterized in that an actuator (13) is formed so that click can be clicked. 제1항에 있어서, 상기 내열성수지필름 패드베이스(11)의 이면에 다수회의 적층 스크린 인쇄를 실시하여 돔스위치(14)를 클릭할 수 있도록 하는 액츄레이터(13)를 형성한 것을 특징으로 하는 적층인쇄 키패드.The laminate according to claim 1, wherein an actuator (13) is formed on the back surface of the heat resistant resin film pad base (11) to perform a plurality of laminated screen printings so that the dome switch (14) can be clicked. Printed keypad. 제1항에 있어서, 상기 내열성수지필름 패드베이스(11)의 이면에 디스펜서(Dispenser)를 이용하여 돔스위치(14)를 클릭할 수 있도록 하는 도트(Dot) 액츄레이터(13)를 형성한 것을 특징으로 하는 적층인쇄 키패드.The dot actuator (13) of claim 1, wherein a dot actuator (13) is formed on the rear surface of the heat resistant resin film pad base (11) so as to click the dome switch (14) by using a dispenser. Laminated printing keypad.
KR20-2005-0008005U 2005-03-24 2005-03-24 a multi layer printed keypad Ceased KR200386686Y1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100771498B1 (en) 2006-02-15 2007-10-30 주식회사 동남실리텍 UV keypad and manufacturing method
KR100791029B1 (en) 2006-08-31 2008-01-03 (주)서원인텍 Keypad and its manufacturing method
KR100907426B1 (en) * 2007-08-20 2009-07-14 디케이 유아이엘 주식회사 Keypad for mobile terminal and manufacturing method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100771498B1 (en) 2006-02-15 2007-10-30 주식회사 동남실리텍 UV keypad and manufacturing method
KR100791029B1 (en) 2006-08-31 2008-01-03 (주)서원인텍 Keypad and its manufacturing method
KR100907426B1 (en) * 2007-08-20 2009-07-14 디케이 유아이엘 주식회사 Keypad for mobile terminal and manufacturing method thereof

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