Optical pickup of two different wavelength laser sources with an

Details Optical pickup of two different wavelength laser sources with an Optical pickup of two different wavelength laser sources with an

1998-11-19

1999-12-28

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 4437, 369 94, 369118, G11B 700

Patent

active

060090669

ABSTRACT:
An optical pickup compatible with at least two types of optical recording media using light beams having respectively different wavelengths for recording and reproducing information. In the optical pickup, a first laser light source emits a light beam having a relatively shorter wavelength. A first photodetector detects a reflected light beam with respect to the relatively shorter wavelength. An objective lens forms an annular shielding region between a near axis region of a relatively smaller radius and a far axis region of a relatively larger radius. A laser unit emits a light beam having a relatively longer wavelength, and detects only a light beam passing though the near axis region in the objective lens among reflected light beams having the relatively longer wavelength. A plurality of beam splitters directs the light beams emitted from the first laser light source and the laser unit to the objective lens, and directs the light beam reflected from each of the optical recording media to a corresponding one of the first photodetector and the laser unit. The optical pickup of the present invention has compatibility with respect to disks regardless of the thicknesses and various aspects of the disks, and can detect a good signal. Also, the optical pickup is manufactured and mass-produced at a low cost.

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patent: 5883874 (1999-03-01), Choi

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