Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1995-03-06
1997-07-08
Reinhart, Mark J.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
B41J 247
Patent
active
056466730
ABSTRACT:
An exposure device. While a photosensitive material is being moved such that a subscanning interval is L, a polygon mirror rotates at rotational speed f.sub.p, and due to this rotation, a light beam is deflected in a main scanning direction and is main-scanned. A material and a configuration of an SOS mirror are set so that a natural frequency f.sub.m thereof is not a value which is an integer multiple of the rotational speed f.sub.p. An SOS sensor outputs a timing signal when a light beam, which is reflected from the SOS mirror and which corresponds to a vicinity of a start-of-main-scan point, is incident on the SOS sensor. Based on the signal, a control device controls a light source such that the light beam is main-scanned from the start-of-main-scan point. An imaging optical system images, on the photosensitive material, the light beam deflected by the polygon mirror. Because the natural frequency f.sub.m of the SOS mirror is not a value near an integer multiple of the frequency f.sub.p, a beat is not generated between the rotational speed f.sub.p of the polygon mirror and the natural frequency f.sub.m of the SOS mirror. Therefore, when the light beam, which is reflected from the SOS mirror and which corresponds to a vicinity of the start-of-main-scan point, is incident on the SOS sensor, the SOS sensor outputs the timing signal appropriately.
REFERENCES:
patent: 4032888 (1977-06-01), Broyles et al.
patent: 4786919 (1988-11-01), Bidner et al.
"Periodic image artifacts from continuous-tone laser scanners" Applied Optics, vol. 25 No. 21, Paul C. Schubert, 1986, pp. 3880-3884.
Fuji Photo Film Co. , Ltd.
Reinhart Mark J.
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