Control of toner particle charge

Details Control of toner particle charge Control of toner particle charge

1989-06-15

1991-04-02

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355246, G03G 1508

Patent

active

050050508

ABSTRACT:
Apparatus is disclosed for controlling the charge-to-mass ratio of developed electrostatic images. An electrostatographic reproduction machine for developing an electrostatic latent image with charge toner particles produces a control signal characteristic of the ratio of toner partical electrostatic charge to the toner particle mass, and the charge-to-mass ratio is adjusted in response to the control signal. The control signal is produced by comparing the ratio of toner particle electrostatic charge to the toner particle mass of a toned test patch. The ratio is adjusted by means of ions directed to the toner particles. The ion source may be capable of producing positive and negative ions, and may be a corona charger.

REFERENCES:
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patent: 3339069 (1967-08-01), Hayne et al.
patent: 3668008 (1972-06-01), Severynse
patent: 3687539 (1972-08-01), Furuichi
patent: 3743540 (1973-07-01), Hudson
patent: 3777158 (1973-12-01), Kamogawa et al.
patent: 3936184 (1976-02-01), Tanaka et al.
patent: 4026643 (1977-05-01), Bergman
patent: 4093368 (1976-06-01), Nishikawa

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