Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-08-14
2000-09-12
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347244, 347256, B41J 2435
Patent
active
061184713
ABSTRACT:
There is provided beam diameter control method and device for changing a focused beam diameter of a laser beam, which can increase light utilization without incorporating a complicated and expensive optical or zoom system. In the beam diameter control method and device, an optical path difference equal to or more than a coherence length of the laser beam is applied to a portion of light flux of the laser beam before the laser beam is focused. A transparent plate is provided to apply such an optical path difference. The laser beam is preferably emitted from a longitudinal multimode semiconductor laser the coherence length of which is short. The transparent plate may be a parallel flat plate or ring-like plate placed near the center of the light flux. The transparent plate is preferably placed within the parallel beam portion of the laser beam. The transparent plate may be placed in a divergent beam portion or a convergent beam portion instead. In this case, the quantity of light flux divided by the transparent plate can be easily changed by moving the position of the transparent plate in a direction parallel to the optical axis.
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Fuji Photo Film Co. , Ltd.
Le N.
Vo Anh T. N.
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