Position determination system for determining the position...

Details Position determination system for determining the position... Position determination system for determining the position...

2006-11-28

2006-11-28

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

Reexamination Certificate

active

07141780

ABSTRACT:
A measurement scale (20) is movable in plane x relative to a mask (10) and photodetector (30). When a pattern of apertures in the mask (10) are in correlation with a pattern of apertures e.g. a reference mark in the scale (20) then light bands a b and c may propagate to the detector (30). The relative sizes of the patterns is such that the light bands converge at the detector (30). Other embodiments show light divergent and light inversion correlation of incongruent patterns.

REFERENCES:
patent: 4631404 (1986-12-01), Burkhardt et al.
patent: 4912322 (1990-03-01), Ichikawa
patent: 4959542 (1990-09-01), Stephens
patent: 5073710 (1991-12-01), Takagi et al.
patent: 5302820 (1994-04-01), Henshaw et al.
patent: 6031224 (2000-02-01), Peterlechner
patent: 6097490 (2000-08-01), Holzapfel et al.
patent: 6342697 (2002-01-01), Nagai et al.
patent: 6472658 (2002-10-01), Mayer et al.
patent: 6486467 (2002-11-01), Speckbacher et al.
patent: 197 54 595 (1999-06-01), None
patent: 0 207 121 (1987-01-01), None
patent: 0 209 676 (1987-01-01), None
patent: 0 887 625 (1998-12-01), None
patent: 1 010 967 (2000-06-01), None
patent: 1 302 762 (1973-01-01), None
patent: 1 303 273 (1973-01-01), None

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