Optical pickup apparatus and information recording and reproducing apparatus

Optical pickup apparatus and information recording and reproducing apparatus

An optical pickup apparatus and an information recording and reproducing apparatus are provided. When a focused state is obtained on a first light receiving portion corresponding to a first laser beam, a relative position of a sensor lens to the first light receiving portion is regulated so that a f...

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1. Verfasser: MIYAKE KOHJI
Format: Patent
Sprache:eng
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INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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creator MIYAKE KOHJI
description An optical pickup apparatus and an information recording and reproducing apparatus are provided. When a focused state is obtained on a first light receiving portion corresponding to a first laser beam, a relative position of a sensor lens to the first light receiving portion is regulated so that a first FES becomes zero, and light receiving regions of a second light receiving portion that receives light reflected from an optical recording medium corresponding to a second laser beam are defined so that a second FES outputted from the second light receiving portion becomes zero. Consequently, when the first FES outputted from the first light receiving portion becomes zero, the second FES outputted from the second light receiving portion can also become zero. Consequently, it is possible to prevent occurrence of a focus offset with respect to both one oscillation wavelength and the other oscillation wavelength.
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subjects INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
title Optical pickup apparatus and information recording and reproducing apparatus
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