Laser beam scanner forming a scanning line along a main...

Details Laser beam scanner forming a scanning line along a main... Laser beam scanner forming a scanning line along a main...

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

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