Fixed point detecting device using detection of light diffracted

Details Fixed point detecting device using detection of light diffracted Fixed point detecting device using detection of light diffracted

1995-03-29

1997-06-10

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 356356, 359566, G02B 2744

Patent

active

056378688

ABSTRACT:
A fixed point detecting device comprises a light source, a hologram disposed therebelow and having two portions, and two light receivers for detecting lights diffracted by the two portions of the hologram, wherein an angle of diffraction of light diffracted by one of the two portions of the hologram and an angle of diffraction of light diffracted by another of the two portions of the hologram have opposite signs and the same absolute value and are constant along the axis of measurement, and a difference in luminous intensity is great between positive and negative homogeneous lights diffracted by the two portions of the hologram.

REFERENCES:
patent: 4970388 (1990-11-01), Nishimura et al.
patent: 5120132 (1992-06-01), Spies et al.
patent: 5258861 (1993-11-01), Tsuchiya
patent: 5430561 (1995-07-01), Kato et al.
patent: 5483377 (1996-01-01), Kaneda et al.
patent: 5498870 (1996-03-01), Ishizuka

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