Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1986-08-07
1988-05-03
Moses, R. L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 3DD, 355 4, 118665, 118689, G03G 1306, G03G 1506
Patent
active
047423722
ABSTRACT:
A toner density control method applicable after detection of a toner empty condition. After each copying operation, in copying machines, a simulated original is exposed to produce a corresponding electrostatic latent image, which image is developed periodically to provide a toner image for detection of the toner image density. If a toner empty condition is detected, a toner density level lower than normal is compared with the detected toner density and then the normal toner density level is compared with the detected level. A toner density control device for forming copies having different colors is likewise disclosed. The optimum density data for development are preset according to the color of the toner contained in the developing device. Electrostatic latent images are developed and compared with the detected density level of the toner image so that a relative decrease in toner image density can be compensated by driving the toner supply device.
REFERENCES:
patent: 4519695 (1985-05-01), Murai et al.
patent: 4522481 (1985-06-01), Imai et al.
patent: 4551005 (1985-11-01), Koichi
patent: 4572654 (1986-02-01), Murai et al.
Mita Industrial Co. Ltd.
Moses R. L.
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