Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1997-09-10
1999-08-17
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
356400, 382317, G01B 1100
Patent
active
059397080
ABSTRACT:
An alignment pattern of the present invention includes a resolution analysis pattern that is formed on the central portion of the alignment pattern for the resolution analysis of a scanning system. A pair of horizontal alignment patterns that cosists of a black zone and a white zone are formed adjacent to the terminations of the resolution analysis pattern for horizontal and boundary alignments. The pattern arrangement of the pair horizontal alignment patterns is not only upside down but also a mirror image with each other. The black zone includes a shallow indented portion adjacent to the resolution analysis pattern in the black zone and on the border of the black zone, white zone. A white rectangular figure is exactly formed over or under the shallow indented portion in the black zone and parallel to the shallow indented portion. The area between the shallow indented portion and the white rectangular figure is used to serve as a horizontal fine alignment for the scanning system. A deep indented portion is adjacent to the shallow indented portion in the black zone and on the border of the black zone and white zone. The deep indented portion is serve as a boundary alignment pattern for boundary alignment of the scanning system. Moreover, the area among the deep indented portion, the shallow indented portion and the white rectangular figure acts as a horizontal rough alignment for the scanning system.
REFERENCES:
patent: 4641357 (1987-02-01), Satoh
patent: 5420944 (1995-05-01), Concannon et al.
patent: 5786590 (1998-07-01), Lin
Luu Thanh X.
Mustek Systems Inc.
Westin Edward P.
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