Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-11-28
1992-08-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023113, G01D 530
Patent
active
051361582
ABSTRACT:
An angular displacement detecting device provided with a tubular casing having a chamber in which a liquid is sealed, a floating body disposed in the liquid and supported for rotation about a predetermined rotational axis, and a detector for detecting the relative angular displacement between the floating body and the tubular casing about the rotational axis, comprises a closed-magnetic-path forming member for forming a closed magnetic path including the floating body, an electrical conductor disposed in the closed magnetic path for relatively displacing the floating body with respect to the tubular casing by energization, and a controlling circuit for varying the amount of energization at the time of the energization of the electrical conductor.
REFERENCES:
patent: 4077252 (1978-03-01), Stutz et al.
patent: 4572030 (1986-02-01), Sakurai et al.
Nakazawa Isao
Shiomi Yasuhiko
Canon Kabushiki Kaisha
Nelms David C.
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