Optical disc apparatus
An optical disc drive (11) of the present invention is configured to have a predetermined range of A/M 2 , which is determined by an area A of a light-receiving surface of a photodetector (26) to receive a reflected laser beam reflected on first and second recording layers of an optical disc, and a...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | An optical disc drive (11) of the present invention is configured to have a predetermined range of A/M 2 , which is determined by an area A of a light-receiving surface of a photodetector (26) to receive a reflected laser beam reflected on first and second recording layers of an optical disc, and a lateral magnification M (ratio of a condenser lens (25) focal length fc to an objective lens (24) focal length fo) of a light-receiving system to pass a reflected laser beam. |
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