Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Reexamination Certificate
2005-05-03
2005-05-03
Pham, Hai (Department: 2861)
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
C347S235000
Reexamination Certificate
active
06888559
ABSTRACT:
A laser beam scanner converges a laser beam by using a first fθ lens and a second fθ lens in a main-scanning direction and in a sub-scanning direction, respectively, onto a photosensitive medium, thereby forming a scanning line on the photosensitive medium along the main-scanning direction. Before scanning the photosensitive medium, the laser beam that has passed through and been converged by the first fθ lens, but not passed through the second fθ lens, is guided to a beam detector and converged by a cylinder lens in the sub-scanning direction so that the laser beam falls within a detection area of the beam detector. The beam detector determines a scan start time by detecting the laser beam.
REFERENCES:
patent: 4720632 (1988-01-01), Kaneko
patent: 4847492 (1989-07-01), Houki
Hattori Yutaka
Ito Koji
Kato Ryota
Tamaru Yasuo
Brother Kogyo Kabushiki Kaisha
Oliff & Berridg,e PLC
Pham Hai
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