Oscillators – With device responsive to external physical condition
Patent
1985-07-29
1987-02-17
LaRoche, Eugene R.
Oscillators
With device responsive to external physical condition
331117R, 331167, 324236, H03B 512
Patent
active
046442987
ABSTRACT:
Disclosed is a proximity switch which includes a current feedback time oscillator so that an object in proximity may be detected from 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 to the end of 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: 3732503 (1973-05-01), Rapp et al.
patent: 4543527 (1985-09-01), Schuchmann et al.
Imazu Keinosuke
Kamiya Fumio
Nodera Hisatoshi
Tomioka Hidehiro
Ueda Kenji
LaRoche Eugene R.
Omron Tateisi Electronics Co.
Pascal Robert J.
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