Exposing device having power controller for controlling laser po

Details Exposing device having power controller for controlling laser po Exposing device having power controller for controlling laser po

1995-05-11

1998-04-21

Metjahic, Safet

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347251, B41J 247

Patent

active

057423245

ABSTRACT:
An exposing device includes a laser light source section for emitting a laser beam, an optical scanning section for scanning a surface of a photosensitive drum in one direction with the laser beam emitted from the laser light source section, and a light source driving section for selectively driving the laser source in dot exposing cycles to form one of an exposure dot and non-exposure dot on the surface of the photosensitive drum within a scanning range of the optical scanning section. Particularly, the light source driving section incudes a laser control circuit for changing a laser power of the laser beam in a predetermined control pattern during each dot exposing cycle assigned to form an exposure dot adjacent to a non-exposure dot. The control pattern is predetermined such that the laser power is changed from a first level to a second level lower than the first level in a first half of the dot exposing cycle, and from the second level to the first level in the remaining half of the dot exposing cycle.

REFERENCES:
patent: 4051536 (1977-09-01), Roetling
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patent: 4594596 (1986-06-01), Takahashi et al.
patent: 5045952 (1991-09-01), Eschbach
patent: 5293207 (1994-03-01), Haneda
patent: 5361089 (1994-11-01), Bearss et al.
patent: 5448278 (1995-09-01), Tanimoto et al.
patent: 5479175 (1995-12-01), Cianciosi et al.
patent: 5532827 (1996-07-01), Kajitani et al.
patent: 5565995 (1996-10-01), Yamada et al.

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