Angle detecting apparatus and projector having the same

Details Angle detecting apparatus and projector having the same Angle detecting apparatus and projector having the same

2005-03-01

2005-03-01

Gregory, Bernarr E. (Department: 3662)

Optics: measuring and testing

Angle measuring or angular axial alignment

Photodetection of inclination from level or vertical

C356S141100, C356S141200, C356S141300, C356S152300

Reexamination Certificate

active

06862086

ABSTRACT:
In an angle detecting apparatus and projector using range finder units, range finding calculations are performed in plural directions using line type passive range finders as the range finding units. An average value of inclination angles calculated based on the range finding calculations is selected as the inclination angle. Thus, if one range finding result has an abnormal value, the adverse effects thereof are reduced and the structure is miniaturized.

REFERENCES:
patent: 4973156 (1990-11-01), Dainis
patent: 5090803 (1992-02-01), Ames et al.
patent: 5648846 (1997-07-01), Douine et al.
patent: 20020021418 (2002-02-01), Raskar
patent: 0974811 (2000-01-01), None
patent: 9033248 (1997-02-01), None
patent: 00089098 (2000-03-01), None
patent: 00180159 (2000-06-01), None

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