Two-wavelength laser pick-up head for a DVD

Details Two-wavelength laser pick-up head for a DVD Two-wavelength laser pick-up head for a DVD

1997-10-08

1999-10-26

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 58, 369110, 369 94, 369 4424, G11B 700

Patent

active

059740205

ABSTRACT:
A two-wavelength laser pick-up head used for accessing DVD, CD, CD-R and CD-E systems. The two-wavelength laser pick-up head includes a shorter wavelength laser optical path for reading the data from a DVD system, and a longer wavelength laser optical path for reading the data from a CD or CD-R system. The above two optical paths use the same collimator and the same objective lens. There is a compensator lens which is used in the longer wavelength laser optical path for correcting the spherical aberration due to the thick substrate of the CD or CD-R.

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