Substrate for an induction sensor

Details Substrate for an induction sensor Substrate for an induction sensor

1994-05-16

1998-01-06

Gellner, Michael L.

Inductor devices

Relatively movable coils

Movable along or parallel to other coil axis

336129, 336115, H01F 2104

Patent

active

057059721

ABSTRACT:
In an electromagnetic induction type displacement sensor, two coil patterns are formed on a substrate included in a scale. The coil patterns alternate with each other in the sensing direction of the sensor and are deviated in spatial phase from each other by a quarter pitch. An idle pattern portion is included in one or both of the two coil patterns in order to provide them with the same impedance. Even when sinusoidal voltages, which are different in phase by 90 degrees, are respectively applied to the coil patterns, the resulting magnetic fields are identical and insure accurate displacement detection.

REFERENCES:
patent: 2799835 (1957-07-01), Tripp et al.
patent: 2915722 (1959-05-01), Foster
patent: 3668587 (1972-06-01), Foster
patent: 3673584 (1972-06-01), Farrant
patent: 3953816 (1976-04-01), Hennequin
patent: 4096463 (1978-06-01), Gitzendanner et al.

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