Optical pickup head and information recording and/or...

Details Optical pickup head and information recording and/or... Optical pickup head and information recording and/or...

2005-03-11

2008-10-14

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112210

Reexamination Certificate

active

07436751

ABSTRACT:
An optical pickup head (100) for a high density recording and/or reproducing device compatible with three types of optical recording media. The pickup head includes a first light source (11a) emitting first beams with a first wavelength, a second light source (12a) emitting second beams with a second longer wavelength, a third light source (13a) emitting third beams with a third even longer wavelength, a prism unit (3), a collimating lens (4) located beside the prism unit, and an objective lens (7) for receiving the light beams and transmitting them to the recording media respectively. The prism unit includes a first portion facing the first source and receiving the first beams, a second portion facing the second source and receiving the second beams, a third portion facing the third source and receiving the third beams, and first and second aberration-correcting portions for the second and third beams to pass therethrough.

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