High frequency oscillation proximity switch

Details High frequency oscillation proximity switch High frequency oscillation proximity switch

1986-02-27

1988-08-02

Salce, Patrick R.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

331 65, G05F 316

Patent

active

047616032

ABSTRACT:
A proximity switch which includes a current feedback type oscillator so that an object in proximity may be detected by the decline in the oscillation output. In order to increase the recovery speed of the oscillation which has dropped as a result of detecting an approaching object, in addition to a first comparison circuit for detecting the object from the oscillation output level, a second comparison circuit is provided for varying the feedback current to the oscillation circuit for maintaining the oscillation level at a certain low level even when the object has come sufficiently close to the proximity switch to otherwise completely terminate the oscillation. By virtue of the increased response speed of the proximity switch, it may be used in an environment where a strong AC magnetic field is present.

REFERENCES:
patent: 3883796 (1975-05-01), Holt et al.
patent: 4613830 (1986-09-01), Kamiya et al.

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