Optical pickup

Details Optical pickup Optical pickup

1997-06-18

1999-07-13

Edun, Muhammed N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4414, 369 4437, G11B 712

Patent

active

059236361

ABSTRACT:
An optical pickup for recording on and reproduction from recording media of different recording densities (e.g. a high density disk such as a DVD and a lower density disk such as an ordinary CD), and having a compact, thin and low power-consumption design. The optical pickup includes an objective lens, a first optical unit having a light-emitting element and a light-receiving element which are used for recording on and reproduction from the high-density optical disk, a second optical unit having a light-emitting element and a light-receiving element which are used for recording on and reproduction from the low-density optical disk, a beam splitter for guiding optical axes of the first and second optical units to the same optical axis, and a wavelength filter for changing a diameter of light beams incident on the objective lens between at the time of recording and reproduction for the high-density optical disk and at the time of recording and reproduction for the low-density optical disk.

REFERENCES:
patent: 5136152 (1992-08-01), Lee
patent: 5281797 (1994-01-01), Tatsuno
patent: 5513164 (1996-04-01), Tanaka et al.
patent: 5636190 (1997-06-01), Choi
patent: 5696749 (1997-12-01), Brazas, Jr. et al.
patent: 5703856 (1997-12-01), Hayashi et al.
Patent Abstracts of Japan, vol. 097, No. 011, Nov. 28, 1997, & JP 09 198703 A (Alpine Electron, Inc.), Jul. 31, 1997.
Patent Abstracts of Japan, vol. 096, No. 011, Nov. 29, 1996, & JP 08 180455 A (Sony Corp.), Jul. 12, 1996.
Patent Abstracts of Japan, vol. 097, No. 002, Feb. 28, 1997, & JP 08 255372 A (Victor Co. of Japan, Ltd.), Oct. 1, 1996.

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