Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-11-13
1997-06-24
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
353 70, G01D 534, G03B 2100
Patent
active
056419570
ABSTRACT:
An inclination angle sensing apparatus for use in a projector includes a plurality of inclination angle sensing devices, each of the inclination angle sensing devices having a moving member, an elastic means, a rack, an idle gear, a sensor pinion, a pair of fixing members, a circuit substrate and an optical sensing unit. In the inclination angle sensing device, the moving member is coupled to the rack and the sensor pinion is engaged with the rack. The sensor pinion has a reflector consisting of a light transmitting and a light reflecting portions, and the optical sensing unit has a portion for emitting a light beam to the reflector on the sensor pinion and a portion for receiving the light beam therefrom. The optical sensing unit determines the amount of rotation the sensor pinion has undergone by the receiving portion thereof counting the number of times the light beam encounters the light transmitting or the light reflecting slices of the sensor pinions during the rotation.
REFERENCES:
patent: 4092064 (1978-05-01), Puel
patent: 4922620 (1990-05-01), Terragni
patent: 4974958 (1990-12-01), Yoshida
Daewoo Electronics Co. Ltd.
Pyo Kevin
Westin Edward P.
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