Image density control method for an image forming apparatus for

Details Image density control method for an image forming apparatus for Image density control method for an image forming apparatus for

1992-01-28

1993-03-30

Moses, Richard L.

Photocopying

Contact printing

Light boxes

355208, G03G 2100

Patent

active

051988615

ABSTRACT:
An image density control method for an image forming apparatus determines the density of a toner image formed on a photoconductive element by a reflection type photosensor and, if the density is low, supplies a toner to a developing unit. A latent image representative of a reference pattern is electrostatically formed on the photoconductive element and then developed by a toner supplied from the developing unit. The supply of a toner to the developing unit is controlled on the basis of the outputs of the sensor associated with the area of the photoconductive element where the pattern image exists and a non-image area. A particular bias voltage is applied to the developing unit for each of the image area and non-image area.

REFERENCES:
patent: 4306804 (1981-12-01), Sakamoto et al.
patent: 4829336 (1989-05-01), Champion
patent: 4878082 (1989-10-01), Matsushita et al.
Patent Abstracts of Japan, vol. 15, No. 309 (P1235); Abs. Pub. Date Aug. 7, 1991 for Japanese Patent Doc. 03-109584, Pub. May 9, 1991.
Patent Abstracts of Japan, vol. 8, No. 202 (P300); Abs. Pub. Date Sep. 14, 1984 for Japanese Pat. Doc. 59-86074, Pub. May 18, 1984.
Patent Abstracts of Japan, vol. 5, No. 138 (P078); Abs. Pub. Date Sep. 2, 1981 For Japanese Pat. Doc. 56-72467, Pub. Jun. 16, 1981.

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