Image forming apparatus

Details Image forming apparatus Image forming apparatus

1997-09-08

1999-04-13

Smith, Matthew S.

Electrophotography

Control of electrophotography process

Control of charging

399 53, 399 55, G03G 1502

Patent

active

058936602

ABSTRACT:
The present invention provides an image forming apparatus that suffers less toner particles scattering and a narrower variation in image density. In this image forming apparatus, a decrease of a contrast potential difference can be compensated by means of a developing bias voltage generator circuit and a grid bias voltage generator circuit, so that the image density can be kept constant. The apparatus includes a developing mechanism in which the respective average particle diameters of carrier members and toner particles, toner concentration, and the diameter and peripheral speed of a developing roller are optimized. Although the diameter of the developing roller is small, therefore, a high image density can be secured, and the value of toner particles scattering can be lowered.

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Patent Abstract of Japan, vol. 17, No. 215, (P-1527), Apr. 27, 1993, abstract of Okada Tomoaki, "Developing Device and Method on Electrophotographic Printing", Japanese 4-350864, Dec. 4, 1992.
Patent Abstract of Japan, vol. 16, No. 551, (P-1453), Nov. 20, 1992, abstract of Shinoda Sankichi, "Developing Device", Japanese 4-208957, Jul. 30, 1997.
Patent Abstract of Japan, vol. 17, No. 231, (P-1532), May 11, 1993, abstract of Hasegawa Yoshisuke, "Developing Device", Japanese 4-360172, Dec. 14, 1992.

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