Optical scanning apparatus

Details Optical scanning apparatus Optical scanning apparatus

2008-04-08

2008-04-08

Do, An H. (Department: 2853)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

C347S134000, C347S255000

Reexamination Certificate

active

11192180

ABSTRACT:
The optical scanning apparatus includes a light amount reducing filter such as a neutral density filter which has transmittance ηndsatisfying an expression ηnd=(W1/W0)/(ηAOM×ηref×ηtra) and a light amount reducing function using absorption or reflection and which is disposed between a laser light source and an AOM on an optical path of laser light beam. In the expression, W0denotes the amount of light emitted from the laser light source, W1denotes the amount of light required for recording on a recording medium, ηAOMdenotes diffraction efficiency in the AOM, ηrefdenotes a sum of reflectances of reflective optical elements located between the laser light source and a surface to be scanned, of the recording medium, and ηtradenotes a sum of transmittances of transmissive optical elements located between the laser light source and the surface to be scanned, other than transmittance of the neutral density filter.

REFERENCES:
patent: 7075689 (2006-07-01), Suzuki et al.
patent: 7269193 (2007-09-01), Morimoto et al.

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