Optical pickup system

Details Optical pickup system Optical pickup system

1995-08-28

1996-09-03

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369100, G11B 0700

Patent

active

055530508

ABSTRACT:
This invention relates to an optical pickup system which can detect focus errors and tracking errors without using diffraction grating. The optical pickup system comprises a laser diode for emitting laser beams, an objective lens for focusing the laser beam from the laser diode onto an optical disc, a two division hologram positioned between the laser diode and the objective lens for diffracting beams after separating a reflected beam reflected at the optical disc and passed through the objective lens into a first laser beam and a second laser beam along an tangential line to a track of the optical disc, and a four division photodetector for focusing the two laser beams diffracted by the two division hologram.

REFERENCES:
patent: 4835378 (1989-05-01), Coops
patent: 4904856 (1990-02-01), Nagahama
patent: 5007690 (1991-04-01), Chern
patent: 5062098 (1991-10-01), Hori
patent: 5066138 (1991-11-01), Toide
patent: 5111449 (1992-05-01), Kurata
patent: 5253237 (1993-10-01), Miyake
patent: 5293367 (1994-03-01), Kadowaki

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