Apparatus for switching modes based on quantity of light received in first section of a photodetector section and first plus second section for controlling a laser diode output
An optical-disk drive device is provided which is capable of executing recording or reproduction at a plurality of numerical apertures and keeping constant the quantity of light which is emitted by a light-emitting element. This optical-disk drive device includes: light-emitting elements; a beam spl...
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| Sprache: | eng |
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