Beam rotation angle detecting apparatus, rotation detecting...

Details Beam rotation angle detecting apparatus, rotation detecting... Beam rotation angle detecting apparatus, rotation detecting...

2005-10-25

2005-10-25

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

Reexamination Certificate

active

06958468

ABSTRACT:
A beam rotation angle detecting apparatus includes a light receiving portion for detecting the incidence positions of at least two beams moving on concentric circles while describing a circle or an arc, and an arithmetic system for calculating and outputting the angle between a straight line linking at least two incidence positions detected by the light receiving portion together and a predetermined reference line.

REFERENCES:
patent: 4760436 (1988-07-01), Yi Zi
patent: 5428217 (1995-06-01), Nakajima
patent: 5483059 (1996-01-01), Igaki et al.
patent: 5640377 (1997-06-01), Watanabe et al.
patent: 6031223 (2000-02-01), Morishita
patent: 6-235622 (1994-08-01), None
patent: 6-347289 (1994-12-01), None

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