Image forming apparatus with exposure control having a smoothing

Details Image forming apparatus with exposure control having a smoothing Image forming apparatus with exposure control having a smoothing

1996-10-17

1998-06-16

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358298, 358458, H04N 129, H04N 140

Patent

active

057679827

ABSTRACT:
An image forming apparatus using a photosensitive body (1) having high gamma characteristics has an exposure unit that is provided with a radiation element whose exposure value is variably set and which is capable of blinking on a pixel-by-pixel basis. An exposure controller (6) is provided with an exposure pattern determining unit (7) that determines an exposure pattern according to the image pattern, and an exposure value switching unit (8) that switches between an exposure value A1 at which the potential of the photosensitive body (1) sharply attenuates and an exposure value A2 at which the potential of the photosensitive body (1) does not substantially attenuate, on the basis of the exposure pattern determined by the exposure pattern determining unit (7). The exposure pattern determining unit (7) is provided with an image area processor (9) that exposes image pixels to an intensive beam having the exposure value A1, and a smoothing processor (10 and 11) that exposes at least white pixels which are adjacent to the image pixels and are to be smoothed to a weak beam having the exposure value A2.

REFERENCES:
patent: 5115259 (1992-05-01), Itoh
patent: 5579090 (1996-11-01), Sasanuma et al.
patent: 5633669 (1997-05-01), Hada et al.
"Positive Charging Organic Photoconductor Using Perinone Bisazopigment Dispersed in Hole Transport Matrix", Itaru Ogawa et al., Japan Hardcopy, 1988, pp. 66-69.
"Positive Charged Mono-layered Photoreceptor with Perylene Pigment", Toru Nakazawa et al., Japan Hardcopy, 1988, pp. 70-73.
"High Gamma OPC For High Speed LED Printer", J. Decker et al., IS&T's Seventh International Congress Advances in Non-impact Printing Technologies, 1991, pp. 328-335.
"Positively-Charged Mono-layer Photoreceptor with H.sub.2 -Phthalocyanine", S. Tsuchiya et al., Matsushita Research Institute Tokyo, Inc., 1991, pp. 336-343.

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