Auto-toner sensor

Details Auto-toner sensor Auto-toner sensor

1988-12-21

1990-04-10

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118689, 355246, G03G 2100

Patent

active

049164880

ABSTRACT:
An auto-toner sensor capable of performing an initial adjustment of the sensitivity of toner density detection automatically by means of a simple configuration is disclosed. The auto-toner sensor includes a sensor for detecting a toner density, and producing a sensor output signal indicating the detected toner density, the sensitivity of the sensor being adjustable by a control signal to be supplied to the sensor; a device for comparing a value of the sensor output signal with a prescribed reference value indicating an appropriate level of the toner density, to produce a comparison signal indicating a result of the comparison; and a device for producing in accordance with the comparison signal a control signal, to be given to the sensor, which adjusts the sensitivity of the detection of the toner density, the control signal having a value such that the value of the sensor output signal is substantially equal to that of the reference value when the toner has the density at the appropriate level.

REFERENCES:
patent: 4592645 (1986-06-01), Kanai et al.
patent: 4708458 (1987-11-01), Ueda et al.
patent: 4742370 (1988-05-01), Murakami et al.
patent: 4801980 (1989-01-01), Arai et al.

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