Image forming method and image forming apparatus for detecting a

Details Image forming method and image forming apparatus for detecting a Image forming method and image forming apparatus for detecting a

1997-10-21

1999-09-07

Braun, Fred L.

Electrophotography

Control of electrophotography process

Control of developing

399 29, 399 49, G03G 1508

Patent

active

059500433

ABSTRACT:
A remaining amount of toner in an image forming apparatus is determined. The amount of toner remaining determines whether the image forming apparatus may be in a low toner state or a no toner state. An estimate of the amount of toner remaining is obtained by accurately estimating the amount of toner consumed. Latent patch images formed on a photoconductive member 1 by an exposure unit 3 are developed by developing device to obtain patch images. Densities of the patch images are measured by a patch sensor 22, and the contents of a weighting coefficient LUT 44 are changed. Meanwhile, the amount of toner developed, which corresponds to the changed weighting coefficient, is calculated by a development toner weight calculating unit 45 for each pixel on the basis of an exposure signal. This amount of toner developed is summed by a development toner weight summing unit 46. The amount of toner consumed is calculated as a function of the density measured by the patch sensor and the amount of toner developed.

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