Oscillators – With device responsive to external physical condition
Patent
1982-12-01
1985-04-23
LaRoche, Eugene R.
Oscillators
With device responsive to external physical condition
336181, 324236, 324327, G01P 1300, H01F 2738
Patent
active
045132577
ABSTRACT:
A proximity switch comprising a detection coil, a first capacitor connected in parallel with the detection coil for forming a resonant circuit, an auxiliary coil, a second capacitor connected in parallel with the auxiliary coil for forming a resonant circuit, an oscillation circuit connected to the detection and auxiliary coils which are connected in series and in reverse winding directions, and an output circuit connected to the oscillation circuit for receiving variations in output generated from the oscillation circuit, the second capacitor having a capacitance larger than that of the first capacitor so that the second capacitor has a reduced low impedance at an oscillation frequency determined by the detection coil and the first capacitor.
REFERENCES:
patent: 3747036 (1973-07-01), Erdmann
patent: 4056769 (1977-11-01), Lefebvre et al.
Miyamoto Kiyoshi
Ueda Kenji
LaRoche Eugene R.
Omron Tateisi Electronics Co.
Paxman W. R.
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