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US 4,914,459 AGranted
Image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsTakashi Mama, Kenichirou Asada, Takanobu Fujioka, Yoshio Kaneko, Masaaki Kogure
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AssigneeRicoh Company, Ltd.
InventorsTakashi Mama, Kenichirou Asada, Takanobu Fujioka, Yoshio Kaneko, Masaaki Kogure
Estimating the term…
An electrophotographic copier, facsimile machine, laser printer or similar image forming apparatus for reproducing an image on a paper sheet by transforming an image signal representative of the image into an image forming signal by pulse width modulation, causing a spot beam in the form of a laser beam which is modulated by the image forming signal to scan a photoconductive element to form an electrostatic latent image thereon, developing the latent image to render it visible, and transferring the visible image to a paper sheet. The laser beam output, the set pulse widths of the image forming signal (beam turn-on times) and the bias voltage for development are changed in association with the deterioration of the laser beam power and the sensitivity of the photoconductive element.
An apparatus for forming an electrostatic latent image representative of image information and a visible image of said latent image on an image carrier by illuminating said image carrier by a spot beam which is manipulated by an image forming signal associated with said image information, said apparatus comprising:
Dependencies are inferred from the claim text.