Digital image forming apparatus for forming a stable image

Details Digital image forming apparatus for forming a stable image Digital image forming apparatus for forming a stable image

1994-12-29

1997-09-02

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358298, H04N 121

Patent

active

056638140

ABSTRACT:
In an electrophotographic process, a laser beam exposes a photoconductor according to image density level to form a latent image. In the exposure, a duty ratio of light emission period to a length of a dot is changed according to the density level. In a first mode, the duty ratio is decreased with the density level if the density level is lower than a predetermined density level, while in a second mode, the duty ratio is increased if the density level is higher than a predetermined density level. Thus, the nonlinearity of gradation characteristic is improved. A user can select a desired mode among three modes on the duty ratio to reproduce an image of desired image quality. Thus, the nonlinearity of gradation characteristic is improved, and an image can be reproduced stably.

REFERENCES:
patent: 4679057 (1987-07-01), Hamada
patent: 4799069 (1989-01-01), Sasaki et al.
patent: 4885672 (1989-12-01), Watanabe
patent: 5124802 (1992-06-01), Ito et al.
patent: 5189441 (1993-02-01), Fukui et al.
patent: 5257075 (1993-10-01), Ohki et al.
patent: 5381221 (1995-01-01), Mizoguchi et al.

Affiliated with

Also associated with

Rating

Digital image forming apparatus for forming a stable image does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital image forming apparatus for forming a stable image, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital image forming apparatus for forming a stable image will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-313105