Scanner as test print densitometer for compensating overall proc

Details Scanner as test print densitometer for compensating overall proc Scanner as test print densitometer for compensating overall proc

1994-10-05

1996-08-13

Brase, Sandra L.

Photocopying

Contact printing

Light boxes

355210, 358298, 358448, 358455, 358456, G03G 2100

Patent

active

055461654

ABSTRACT:
An electrostatographic copier or copier/printer apparatus and method for calibrating same with an improved means for adjusting for process control parameters is described. The apparatus includes a scanner for scanning an original document to be copied and for generating signals representing a density characteristic of images on the document. An electronic writer responsive to scanned signals modulates charge on an electrostatographic recording member to form a latent electrostatic image. The latent image is developed and transferred to a record member. Them are provided further means responsive to rescanning of the record member by the scanner for generating adjustment signals for correcting for calibration errors in processing of an image, and the writer is responsive to the adjustment signals. The writer may thereby correct for nonuniformities in a direction transverse to said process direction. In a further calibration step, there are generated adjustment signals that are responsive to scanning by the scanner of a halftone step tablet on a record member. The adjustment signals are used to generate adjusted halftone rendering patterns for printing by the writer. In a further calibration step, calibration errors in a reproduction process are determined by scanning of a contone step pattern and adjustment signals are generated for modifying data for generating exposure clock signals which are determined for scanning of a contone step pattern and which control exposure time durations of the writer.

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U.S. application Ser. No. 08/175,079, filed Dec. 29, 1993 to Isaac I. Ajewole.
U.S. application Ser. No. 07/807,522, filed Dec. 13, 1991 to E. Michael Kelly et al.

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