Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-02-24
1989-09-26
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250236, 350 67, 358494, H04N 104
Patent
active
048702730
ABSTRACT:
This invention relates to a pyramid polygon scanner without cylinder optics wherein the effects of jitter are reduced by the use of a start of scan detector situated at a predetermined angle from the normal (vertical) position. The start of scan detector is rotated about an axis through the nominal scan line. Thus, if tilt (not the draft angle) is present in the rotating polygon system and jitter is generated, the rotation angle of the split detector moves the jitter to the beginning and end of scan, leaving the center of scan free of the effects of jitter. The angle of the split detector is in approximate relation to the angle of incidence at the first reflection on the rotating polygon.
REFERENCES:
patent: 3987132 (1975-07-01), Meeussen et al.
patent: 4143403 (1979-03-01), Ohnishi
patent: 4214157 (1980-07-01), Check, Jr. et al.
patent: 4312590 (1982-01-01), Harbaugh
patent: 4433894 (1984-02-01), Hanson et al.
patent: 4620237 (1986-10-01), Traino et al.
patent: 4733064 (1988-03-01), Ishikawa
Garwin; "Means for Compensating Facet Tilt on a Rotating-Mirror Scanner"; IBM Tech. Disc. Bull.; vol. 24, No. 7A, Dec. '81; pp. 3252-3254.
Cunha Robert E.
Westin Edward P.
Xerox Corporation
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