Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1998-02-10
2000-11-28
Williams, Kimberly A.
Facsimile and static presentation processing
Facsimile
Picture signal generator
358475, 358481, 347236, 347246, 347253, H04N 104
Patent
active
06154292&
ABSTRACT:
An apparatus for scanning with multiple beams emitted from a semiconductor laser by a polygonal mirror, wherein an image is written for each scanning line by each beam of the multiple beams. The apparatus includes an automatic light amount control circuit having: (i) a light amount detecting circuit to detect a light amount of each beam for each scanning line, and (ii) a sampling/holding circuit to sample and hold a control voltage corresponding to the detected light amount of each beam for each scanning line. The automatic light amount control circuit controls the semiconductor laser based on the control voltage held by the sampling/holding circuit so as to control the light amount of each beam to be a predetermined light amount for each scanning line. The apparatus also includes a synchronization control circuit having an index sensor and a light receiving section on which each beam passes. The index sensor detects a passage of each beam on the light receiving section and generates a passage signal for each beam, and the synchronization control circuit controls each beam based on the passage signal so as to be synchronized with other beams for each scanning line. The automatic light amount control circuit, moreover, controls the light amount of each beam for each scanning line before each beam on each scanning line enters the light receiving section of the synchronization control section.
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Konica Corporation
Williams Kimberly A.
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