Laser beam scanning apparatus and method providing controllable

Details Laser beam scanning apparatus and method providing controllable Laser beam scanning apparatus and method providing controllable

1996-07-24

1999-11-30

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347239, 347240, 347256, 347241, 359210, 353101, B41J 247

Patent

active

059951303

ABSTRACT:
A laser beam scanning apparatus and method for providing controllable print density. The laser beam scanning apparatus includes a modulator for modulating a light beam, a rotating polygon mirror for deflectively scanning a light beam which is passed through the modulator, at least one lens unit having at least one lens which is movable to a position on the optical axis and a position completely off the optical axis, and a controller for switching the modulating clock frequency of the modulator and the rotating speed of the polygon mirror together with selective shifting of the at least one lens unit or lens thereof to a position on the optical axis or completely off the optical axis whereby the method effects control of the apparatus for controlling print density.

REFERENCES:
patent: 4871238 (1989-10-01), Sato et al.
patent: 5475416 (1995-12-01), Kessler et al.

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