Objective lens, optical head, and optical pickup apparatus

Objective lens, optical head, and optical pickup apparatus

An objective lens for at least one of recording and reproducing for an optical information recording medium includes in the order from a light source side: a first lens group having negative refracting power, which is in a meniscus shape having a concave surface facing the light source side; a secon...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: SAKAMOTO KATSUYA
Format: Patent
Sprache:eng
Schlagworte:
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Beschreibung
Zusammenfassung:An objective lens for at least one of recording and reproducing for an optical information recording medium includes in the order from a light source side: a first lens group having negative refracting power, which is in a meniscus shape having a concave surface facing the light source side; a second lens group having positive refracting power; and a third lens group having positive refracting power, which is in a meniscus shape having a concave surface facing an image side.