Synchronizing signal generating circuit for optical multiple-sca

Details Synchronizing signal generating circuit for optical multiple-sca Synchronizing signal generating circuit for optical multiple-sca

1996-09-27

1999-03-16

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347234, 347248, 347250, 358409, H04N 116

Patent

active

058836578

ABSTRACT:
An optical multiple-scanning device has a number of scanning laser light beams that scan along a scan path, are separated along the scan path by a predetermined pitch P, and produce an illumination spot of diameter D along the scan path. A synchronizing signal generating circuit for the optical multiple-scanning device includes a single photodiode and a signal processing circuit. The single photodiode has a width W along the scan path and generates a signal with maximums IMAX and minimums IMIN. If the condition W.ltoreq.P-D/4 is met, or if IMIN is less than or equal to 80% of IMAX, the signal processing circuit accurately generates a square-wave synchronizing signal such that successive rectangular pulses of the synchronizing signal cyclically indicate that successive scanning laser beams have reached a predetermined position along the scan path.

REFERENCES:
patent: 5444239 (1995-08-01), Nacman et al.
patent: 5450120 (1995-09-01), Nishio

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