Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1996-10-22
1999-12-28
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347241, 347253, B41J 247
Patent
active
060088354
ABSTRACT:
An image forming device wherein a Gaussian laser beam is scanned imagewise on a photosensitive recording medium by an image forming optical system including an optical filter having such a laser beam filtering pattern that the optical transmittance is a minimum value M of 40-60% at the center thereof and gradually increases from the center in the radially outward direction in a Gaussian distribution mode. The filter has a filtering radius R.sub.f which is a distance between the center and a point on the filter providing a transmittance equal to 100-(100-M)/e.sup.2 % and which is not smaller than 0.9 R.sub.b but not greater than 1.1 R.sub.b where R.sub.b is a beam radius of the Gaussian laser beam.
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Le N.
Nguyen Thinh
Ricoh & Company, Ltd.
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