Magnetic induction type transducer means

Details Magnetic induction type transducer means Magnetic induction type transducer means

1975-11-19

1977-02-08

Gill, James J.

Measuring and testing

Volumetric content measuring

73 43LR, 336134, G01L 500

Patent

active

040066282

ABSTRACT:
A transducer for converting mechanical forces into corresponding electrical signals. In one embodiment, the transducer takes the form of a writing instrument for use in a user identification system whereby the time-varying force between the instrument and a writing surface generates a waveform which is characteristic of the individual doing the writing. The transducer includes first and second core members being interconnected by a resilient member with the core members being operatively coupled to a coil whose inductance varies in accordance with the forces generated during writing. The coil is operatively coupled to an oscillator whose frequency changes in accordance with the varying inductance to produce the waveform.

REFERENCES:
patent: 2674721 (1954-04-01), Jackson et al.
patent: 2786983 (1957-03-01), Hill
patent: 3528295 (1970-09-01), Johnson et al.
patent: 3609615 (1971-09-01), Parker et al.
patent: 3621720 (1971-11-01), Clark

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