Apparatus for converting key topography into electrical signals

Details Apparatus for converting key topography into electrical signals Apparatus for converting key topography into electrical signals

1986-06-09

1988-01-26

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082531, 34082534, 361172, H04Q 100

Patent

active

047219564

ABSTRACT:
Key evaluating apparatus for receiving a key having a surface whose amplitude or height is variably coded and for sensing the coded key surface to provide a set of sample signals corresponding to a sequence of sampling points on the coded key surface. The key evaluating apparatus of this invention comprises a key follower suspended to follow the movement of the coded key surface as the key is inserted past a fixed point. A key movement responsive mechanism is responsive to the movement of the key follower for generating the set of signal samples corresponding to the sequence of sampling points of the coded key surface.

REFERENCES:
patent: 3500326 (1970-03-01), Benford
patent: 3797936 (1974-03-01), Dimitriadis
patent: 3845361 (1974-10-01), Watase et al.
patent: 4177657 (1979-12-01), Aydin
patent: 4288783 (1981-09-01), Chauvat et al.
patent: 4399673 (1983-08-01), Gotanda

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