KEY SHEET AND PRODUCTION METHOD THEREOF
First Claim
Patent Images
1. A key sheet comprising:
- a plurality of thin key tops made of a metal having penetrated holes for displaying letters, symbols or the like by means of press molding, laser etching, chemical etching or the like,a resin layer having translucency adhered onto a back surface of said key top and filled into said penetrated holes, anda key pad comprising a base portion with a thin sheet shape and a plurality of key top arranging portions having a contact pressing projection formed integrally with said base portion,wherein said plurality of key tops and said key pads are fixed together through the intermediary of said resin layer adhered onto the back surface of said key top with an adhesive having transparency or translucency.
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Abstract
Portable phones are getting a trend that s design and thinner configuration becomes more important. Therefore, in order to meet this demand, the entire key top is made of a thin metal, and a thin resin layer is provided on the back surface of the key top and further letter holes are filled with a resin. According to those, the adhesiveness of the key top is improved as well as improvement of hand feeling. In addition, a printed layer for coloring the letters can be provided on the back surface of the key top.
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Citations
7 Claims
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1. A key sheet comprising:
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a plurality of thin key tops made of a metal having penetrated holes for displaying letters, symbols or the like by means of press molding, laser etching, chemical etching or the like, a resin layer having translucency adhered onto a back surface of said key top and filled into said penetrated holes, and a key pad comprising a base portion with a thin sheet shape and a plurality of key top arranging portions having a contact pressing projection formed integrally with said base portion, wherein said plurality of key tops and said key pads are fixed together through the intermediary of said resin layer adhered onto the back surface of said key top with an adhesive having transparency or translucency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A production method of a key sheet which supports a plurality of key tops made of a metal, displaying predetermined letters, symbols or the like on a common key pad, the method comprising the steps of:
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preparing a thin metal plate having a size (area) on which the key tops can be arranged and having a thickness of about 0.05 to 0.2 mm; forming penetrated holes constituting letters, symbols or the like on said metal plate by means of press molding, laser etching, chemical etching or the like; providing a resin layer having translucency and having a thickness of 0.1 to 0.3 mm on one surface of said metal plate by means of insert molding which is carried out such that said metal plate is placed in a die; separating the key tops having letters, symbols or the like individually from said metal plate by means of the punching; molding a key pad comprising a base portion with a sheet shape and a plurality of key top arranging portions having a contact pressing projection; and adhering each individual key top having a letter, symbol or the like separated by means of the punching onto said key top arranging portions of said key pad.
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Specification