Optical system for optical disc having first and second informat

Details Optical system for optical disc having first and second informat Optical system for optical disc having first and second informat

1996-11-20

1998-11-10

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, 369 4423, 369 4429, G11B 700

Patent

active

058354662

ABSTRACT:
There is provided an optical pickup controlling system for an optical disc player. The optical disc player is adapted to direct a laser beam on to an optical disc which contains a first information recorded thereon in terms of information pits formed on information tracks and a second information recorded thereon in terms of shapes of information tracks. Here, the laser beam may have a first beam spot or a second beam spot, the second beam spot is for reproducing the second information, the second beam spot is narrower in a direction orthogonal to the information track direction than the first beam spot which is for reproducing or recording the first information. In detail, the first beam spot is in an elliptical shape having its shorter axis arranged in the information track direction, the second beam spot is in another elliptical shape having its shorter axis arranged in a direction orthogonal to the information track direction.

REFERENCES:
patent: 5132953 (1992-07-01), Matsubayshi
patent: 5297114 (1994-03-01), Itoh et al.
patent: 5361244 (1994-11-01), Nakamura et al.
Patent Abstract of Japan No. 06 052 549, vol. 18, No. 293, Jun. 3, 1994.
Patent Abstract of Japan No. 7 244 919, vol. 096. No. 001, Jan. 31, 1996.
Patent Abstract of Japan No. 6 215 411, vol. 18, No. 587, Nov. 10, 1994.

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