Sensitive key device having a detective surface in direct contac

Details Sensitive key device having a detective surface in direct contac Sensitive key device having a detective surface in direct contac

1996-12-19

1999-04-06

Kincaid, Kristine

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

3612982, 3612984, 200246, 200275, H01G 518, H01G 506, H01H 124

Patent

active

058926526

ABSTRACT:
This invention concerns a sensitive key device with capacitive effect working through an electrically insulating plate, the key being supported by a printed circuit board. According to the invention, the bottom of a single part having a spring blade made of an electrically conducting material is fixed to the printed circuit board. The top (11) of this part forms a detection surface designed to be placed in contact with the transparent plate. The center of the part makes the part flexible such that the detection surface is in elastic contact with the plate, regardless of parallelism defects between this plate and the printed circuit board.

REFERENCES:
patent: 3950846 (1976-04-01), Johnson
patent: 4056699 (1977-11-01), Jordan
patent: 4090229 (1978-05-01), Cencel et al.
patent: 4584444 (1986-04-01), Nagashima
patent: 4737602 (1988-04-01), Yamamoto
patent: 4952762 (1990-08-01), Koyanagi
patent: 5545864 (1996-08-01), Bauer et al.

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