Optical pickup device for discs of varying characteristics

Details Optical pickup device for discs of varying characteristics Optical pickup device for discs of varying characteristics

1996-12-26

1999-07-27

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, G11B 700

Patent

active

059302194

ABSTRACT:
An improved optical pickup apparatus which is capable of reading data from and writing the same in discs each having a different recording density and thickness by using only one optical pickup apparatus by controlling the numerical aperture of an objective lens by using a Liquid Crystal Shutter (LCS) and a diffraction hologram. The apparatus includes a diffraction direction conversion member for converting a diffraction direction of a beam from a laser diode, which beam advances toward an optical disc, a diffraction member for selectively diffracting the beam passed through the diffraction direction conversion member in accordance with a diffraction state, and an objective lens for focusing the beam from the diffraction member on the optical disc.

REFERENCES:
patent: 5446565 (1995-08-01), Komma et al.
patent: 5495461 (1996-02-01), Komma et al.
patent: 5594713 (1997-01-01), Komma et al.
patent: 5638353 (1997-06-01), Takahashi

Affiliated with

Also associated with

Rating

Optical pickup device for discs of varying characteristics does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical pickup device for discs of varying characteristics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pickup device for discs of varying characteristics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-887293