Optical pickup apparatus for reading and recording...

Details Optical pickup apparatus for reading and recording... Optical pickup apparatus for reading and recording...

2006-02-07

2006-02-07

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112020

Reexamination Certificate

active

06996050

ABSTRACT:
A laser beam emitted from a laser diode and having a wavelength of 780 nm is S-polarized. A polarization plane rotating means (λ/4 phase plate) is disposed between a super-resolution cut-off filter comprising a polarizing filter film and an objective lens. When reading on DVD, the objective lens, the polarization plane rotating means and the super-resolution cut-off filter in combination are set to the optical path. The S-polarized laser beam is focused to a micro spot diameter by super-resolution effects by the super-resolution cut-off filter together with the objective lens. Also, the S-polarized laser beam reflected at a disk and traveling backward along the incoming optical path is converted into a P-polarized laser beam while passing backward through the polarization plane rotating means. The P-polarized laser beam passes through the super-resolution cut-off filter without loss is received by a photo-detector.

REFERENCES:
patent: 5594713 (1997-01-01), Komma et al.
patent: 5600614 (1997-02-01), Katayama
patent: 2002-203334 (2002-07-01), None
“Optical and Electro-Optical Engineering Contact”, vol. 33, No. 11 (1995), no month or day.

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