Test pattern generating apparatus of a laser printer

Details Test pattern generating apparatus of a laser printer Test pattern generating apparatus of a laser printer

1994-12-29

1998-09-22

Fuller, Benjamin R.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

B41J 247, H01S 300

Patent

active

058121773

ABSTRACT:
A test pattern generating apparatus of a laser printer capable of simply performing a test of an engine section of a printer apparatus such as a laser printer and a facsimile machine and of judging whether or not a control circuit of the engine section or data control circuit thereof is normally operated when in use is disclosed. The present invention includes a beam detection receiving circuit for receiving beam detection signals from a laser scanning apparatus; a first counter circuit for counting main clock signals of a central processing unit by N number in response to beam detection signals obtained from the beam detection receiving circuit and for controlling the beam detection receiving circuit; a buffer for buffering the beam detection signals obtained from the beam detection receiving; a n/N counter control circuit for generating count enabling signals in response to the beam detection signals obtained from the beam detection receiving circuit; a second counter circuit for counting beam detection signals, obtained from the buffer by the count enabling signals of the n/N counter control circuit and the count control signals of the central processing unit, by 1 first and second set values; a N
difference pulse generating circuit for generating a pulse data of a vertical line having a width of a difference of the first and second set clocks obtained from the second counter circuit; and a M counter circuit for controlling the n/N counter control circuit by counting the pulse generated from the N-n difference pulse generating circuit by a set value.

REFERENCES:
patent: 5291221 (1994-03-01), Sanger et al.

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