| 摘要 |
The optical scanning apparatus includes a light amount reducing filter such as a neutral density filter which has transmittance eta<SUB>nd </SUB>satisfying an expression eta<SUB>nd</SUB>=(W<SUB>1</SUB>/W<SUB>0</SUB>)/(eta<SUB>AOM</SUB>xeta<SUB>ref</SUB>xeta<SUB>tra</SUB>) 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, W<SUB>0 </SUB>denotes the amount of light emitted from the laser light source, W<SUB>1 </SUB>denotes the amount of light required for recording on a recording medium, eta<SUB>AOM </SUB>denotes diffraction efficiency in the AOM, eta<SUB>ref </SUB>denotes 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 eta<SUB>tra </SUB>denotes 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.
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