Detecting and correcting for low developed mass per unit area

Details Detecting and correcting for low developed mass per unit area Detecting and correcting for low developed mass per unit area

1993-07-12

1995-01-31

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355203, 355208, 430 30, G03G 2100

Patent

active

053862767

ABSTRACT:
A method of maintaining consistent large solid area development by developing a large area test patch covering the image area of a photorececptor and detecting the lead edge and trail edge density of the test patch using a densitometer to measure reflectance and comparing the lead and trail edge density to the lead and trail edge density of a reference patch. The reference patch is generated after the changing of developer elements such as developer material and photoreceptor and an electrostatic set up performed. Alternatively a density differential between lead and trail edge density of the test patch is detected. Electrostatic parameters such as preset toner concentration control values and decreasing the development field of the test patch are adjusted to maintain constant large solid area development.

REFERENCES:
patent: 4341461 (1982-07-01), Fantozzi
patent: 4572654 (1986-02-01), Murai et al.
patent: 4639117 (1987-01-01), Murai et al.
patent: 4910557 (1990-03-01), Imai
patent: 5057866 (1991-10-01), Hill, Jr. et al.
patent: 5138377 (1992-08-01), Smith et al.

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