Optical recording medium, optical recording and reproducing...

Details Optical recording medium, optical recording and reproducing... Optical recording medium, optical recording and reproducing...

2005-09-06

2005-09-06

Dinh, Tan (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S110010, C369S110040, C369S112160, C365S120000, C365S121000, C430S001000, C430S019000, C430S270150, C430S643000

Reexamination Certificate

active

06940801

ABSTRACT:
An optical recording medium, an optical recording and reproducing method, and an apparatus that can record and reproduce multilevel information at a high density and with a high S/N ratio. Recording light emitted from a light source is collimated by a collimation lens and introduced into a polarization rotary device. Recording light transmitted by the polarization rotary device is focused by an objective lens onto an optical recording medium. In response, a photo-induced birefringence is recorded on the optical recording medium. Multilevel recording is performed by controlling a voltage applied to the polarization rotary device to change a polarization angle θ of recording light. Reproduction is performed by detecting light reflected from the optical recording medium with an analyzer and a detector.

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