Circuit for generating a position in digital form

Details Circuit for generating a position in digital form Circuit for generating a position in digital form

1984-08-10

1986-12-02

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340347SY, 34087031, G01B 700, G08C 1908

Patent

active

046266216

ABSTRACT:
A circuit for generating a position signal has a detector having a detecting coil whose inductance varies in accordance with the position of an object which generates a first pulse response signal relating to the inductance of the detecting coil in response to the pulse signal, another detector having a constant inductance coil which generates a second pulse response signal relating to the inductance of the constant inductance coil in response to the pulse signal, and a circuit for producing a digital signal showing the ratio of the inductances of the detecting coil and the constant inductance coil as position data in response to at least the first and the second pulse response signals. The position signal can be directly obtained in digital form and the change in the inductances due to temperature change can be canceled out to obtain position data with high accuracy.

REFERENCES:
patent: 4364045 (1982-12-01), Spiegel

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