Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Reexamination Certificate
2011-01-25
2011-01-25
Leon, Edwin A. (Department: 2833)
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
Reexamination Certificate
active
07875815
ABSTRACT:
The present invention provides a key sheet in which adjacent key tops are prevented from moving in conjunction with each other even when intervals between the key tops are designed to be narrow, and which facilitates a depressing operation by eliminating interference between the adjacent key tops. Further, the present invention provides a pushbutton switch using the above-mentioned key sheet. When a central key top is depressed, a portion of a soft sheet positioned between the key top and the key tops therearound is deformed to a large degree. On the other hand, a hard sheet is flexed entirely to a portion extending to a portion directly below the key tops. As a result, a clearance portion between the soft sheet and the hard sheet is formed. Therefore, the left and right key tops do not move in conjunction with each other, thereby making it possible to prevent erroneous input. Further, the peripheral key tops are not affected by the depressing operation of the central key top, thereby making it possible to suppress a depressing operation load to be small.
REFERENCES:
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patent: 5607048 (1997-03-01), Kaizu et al.
patent: 5901834 (1999-05-01), Inubushi et al.
patent: 2002/0030987 (2002-03-01), Saito et al.
patent: 2003/0173201 (2003-09-01), Ohashi
patent: 2006/0267937 (2006-11-01), Takatsuka et al.
patent: 2003-323827 (2003-11-01), None
Communication from European Patent Office for application No. 07011729.6-2214 dated Nov. 6, 2007.
Cermak Nakajima LLP
Leon Edwin A.
Nakajima Tomoko
Polymatech Co. Ltd.
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