Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2007-12-04
2007-12-04
Dinh, Tuan T. (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S795000, C174S262000, C200S511000, C200S512000
Reexamination Certificate
active
11333688
ABSTRACT:
A printed circuit board with thin film switches for a keyboard including an upper board having multiple circuit lines, an insulating separation defining multiple through holes, a lower board having multiple circuit lines and multiple thin film switches mounted on the upper and lower boards. The thin film switch has two thin film conductive elements respectively formed on the upper and lower boards and correspond to one of the through holes in the insulating separation. Each thin film conductive element has a center conductor, at least two outer conductors formed adjacent to the center conductor, and at least two conductive lines connected to the center and outer conductors. With such an arrangement, the areas of the center and outer conductors will be reduced, surfaces of the conductors are even in the curing procedure of fabricating upper or lower board to keep a stable touching sensitivity.
REFERENCES:
patent: 4249044 (1981-02-01), Larson
patent: 5786986 (1998-07-01), Bregman et al.
patent: 5895900 (1999-04-01), Okada et al.
patent: 6388208 (2002-05-01), Kiani et al.
patent: 6614663 (2003-09-01), Yokota et al.
Dinh Tuan T.
Kamrath Alan
Kamrath & Associates P.A.
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