Image output apparatus

Details Image output apparatus Image output apparatus

1995-04-18

1998-06-16

Fuller, Benjamin R.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347261, B41J 247

Patent

active

057678901

ABSTRACT:
An image output apparatus such as a laser printer in which, in the case where the write density is changed, the light quantity is controlled by using a period when the rotational speed of a polygonal mirror is changed. In the apparatus, when an instruction for switching the write density is issued and the rotational speed of the polygonal mirror is set to be a changed value, a laser beam forced turn-off signal generating circuit generates a laser beam forced turn-off signal having a turn-off period which corresponds to the rotational speed of the polygonal mirror. During the period when the rotational speed of the polygonal mirror is changed, a laser beam light quantity controlling circuit controls the light quantity of the laser diode so as to have a value corresponding to the changed write density. Even during a period when the rotational speed of the polygonal mirror is changed, therefore, the light quantity can be controlled without exposing the photoreceptor to light.

REFERENCES:
patent: 4862288 (1989-08-01), Sekiya
patent: 5504517 (1996-04-01), Takashi et al.

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