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US 7,705,259 B2Granted
Thin key sheet and thin key unit incorporating the thin key sheet
AssigneeSunarrow Ltd
InventorYoshio Kenmochi
Life of this patent
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AssigneeSunarrow Ltd
InventorYoshio Kenmochi
Estimating the term…
Mobile phones are in a trend of having thinner configuration due to emphasis on the design. Thus, in order to meet this demand, the present invention aims to thin the key sheet portion as much as possible. A thin key sheet and a thin key unit incorporating the thin key sheet are configured by providing on its surface a key top 2 made of a metal or a resin with indications such as letters, symbols, graphics or the like indicating the functions of keys are formed on the front surface or the back surface thereof, and switch elements 4 for turning ON/OFF of an electric circuit by the pressing of the key top, together with a printed circuit board 5 on which a circuit pattern involved therewith is formed; and by adhering and fixing the key top 2 and the printed circuit board 5 together via a cushion gasket 3 having appropriate elasticity and a filler layer 14 disposed between the key top and the printed circuit board.
A thin key sheet comprising a single or a plurality of key top(s) made of a metal or a resin having indications including letters, symbols, graphics indicating the functions of keys, and a cushion gasket provided on a back surface of the key top;
A thin key unit comprising a single or a plurality of key top(s) made of a metal or a resin having indications including letters, symbols, graphics indicating the functions of keys, and a printed circuit board on which a circuit pattern for turning ON/OFF of an electric circuit by the pressing of the key top is formed, wherein the key top and the printed circuit board are adhered and fixed together by a cushion gasket interposed between the key top and the printed circuit board;
A thin key unit comprising a single or a plurality of key top(s) made of a metal or a ream having indications including letters, symbols, graphics indicating the functions of keys, and a printed circuit board on which a circuit pattern for turning ON/OFF of an electric circuit by a pressing of the key top is formed, wherein the key top and the printed circuit board are adhered and fixed together by a cushion gasket interposed between the key top and the printed circuit board;
Dependencies are inferred from the claim text.