Circuit for generating a square test pattern in a page printer

Details Circuit for generating a square test pattern in a page printer Circuit for generating a square test pattern in a page printer

1990-12-31

1992-04-28

Evans, Arthur G.

Photocopying

Contact printing

Light boxes

355204, 395117, G06K 1500

Patent

active

051094789

ABSTRACT:
There is provided a circuit for generating a square test pattern including: a clock pulse generator for generating clock pulses; a frequency demultiplier for dividing the clock pulses of the clock pulse generator by eight in order to minimize errors in synchronism; a longitudinal line generator for receiving the divided clock pulses of the frequency demultiplier to generate longitudinal line printing data and a printing start and end signals; a printing area establishing unit for receiving a printing start and end signals of a line output from the longitudinal line generator to establish the printing and end points by the clock pulses of the frequency demultiplier; a synchronizing signal generator for synchronizing horizontal synchronizing signals by the divided clock pulses of the clock pulse generator to generate load signals of the longitudinal line generator and transverse line clock pulses; a transverse line generator for receiving the transverse line clock pulses of the synchronizing signal generator to generate transverse line printing data; and a square pattern generator for receiving the output signals of the transverse and longitudinal line generator to generate square pattern printing data by the output signal of the printing area establishing unit.

REFERENCES:
patent: 4661001 (1987-04-01), Takai et al.
patent: 4860119 (1984-08-01), Maniwa et al.

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