Image forming apparatus for controlling image density using loga

Details Image forming apparatus for controlling image density using loga Image forming apparatus for controlling image density using loga

1993-03-17

1994-11-15

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355246, 250214L, 356445, 327350, 327362, G03G 1500

Patent

active

053653130

ABSTRACT:
A toner depositing amount measuring apparatus for measuring the amount of toner deposited on a photosensitive drum includes a light source for irradiating the surface of the photosensitive drum with light and a photoelectric converting section for receiving the reflected light and converting the received reflected light into an electric signal. A logarithmic calculation is applied to the output signal of the photoelectric converting section in a logarithm-compressing section. The temperature characteristics of the logarithm-compressing section are compensated for in a temperature compensating section. The amount of the toner deposition is calculated in a toner depositing amount calculating section based on a difference between the data during non-deposition of the toner and the data during deposition of the toner, the data being obtained from the logarithm-compressing section. Further, image forming conditions are changed in a control section in accordance with an output signal denoting the calculated deposition amount of the toner so as to control the density of the image formed.

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