Optical pickup for an optical disc player

Details Optical pickup for an optical disc player Optical pickup for an optical disc player

1993-01-08

1995-01-10

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369112, G02B 2608

Patent

active

053813944

ABSTRACT:
An optical pickup for an optical disc player has a laser for emitting a laser beam for optical discs which are different from each other in recording density. The laser beam from the laser is divided into two beams by a beam splitter. A first objective is provided for focusing one of the laser beams on one of the optical discs. A beam expander is provided for expanding an intensity distribution in the optical axis. A second objective provided for focusing the expanded laser beam on the other disc with a spot having a larger diameter,

REFERENCES:
patent: 4712207 (1987-12-01), Reno
patent: 5223970 (1993-06-01), Oono et al.
patent: 5235581 (1993-08-01), Miyagawa et al.

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