Image forming apparatus

Details Image forming apparatus Image forming apparatus

2007-10-09

2007-10-09

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S234000, C347S133000, C347S246000

Reexamination Certificate

active

11387911

ABSTRACT:
An image forming apparatus includes an exposure unit, a developing unit and a transferring unit that transfers a visualized image of developer to an image recording medium. The exposure unit includes a light emitting unit, a detecting unit that detects a quantity of light, a reference voltage generating portion that generates a reference voltage set in accordance with a targeted value of the quantity of light, an emitted-light quantity control circuit that controls the quantity of light emitted from the light emitting unit so that a detection voltage becomes equal to a value of the reference voltage, and a reference voltage control portion that controls the reference voltage generating portion so as to change the reference voltage at a predetermined rate in stages. A new reference voltage is based on a density of the image of the developer obtained after being changed when the density is changed.

REFERENCES:
patent: 5678132 (1997-10-01), Shiba et al.
patent: 2005/0219990 (2005-10-01), Inukai
patent: 3-58065 (1991-03-01), None
patent: 6-141582 (1994-05-01), None
patent: 9-58048 (1997-03-01), None
patent: 10-37067 (1998-12-01), None
patent: 2001-219593 (2001-08-01), None

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