Optical head assembly having compatibility with digital versatil

Details Optical head assembly having compatibility with digital versatil Optical head assembly having compatibility with digital versatil

1998-02-27

2000-06-20

Edun, Muhammad

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 94, 369 54, 369 4437, G11B 709

Patent

active

060785551

ABSTRACT:
An optical head assembly having compatibility with a recordable compact disk (CD-R) and a digital video disk (DVD) includes a stationary first optical unit and a second optical unit which moves to a position to change the target sector of an optical disk loaded in an optical disk driver on which the incident beam is irradiated by travelling between an inner circumference and an outer circumference of the loaded optical disk. The first optical unit directs an emitted first light beam having a wavelength of 635 nm for a DVD to the second optical unit and detects information contained in the first light beam redirected from the second optical unit, if the DVD is the loaded optical disk. Meanwhile, the second optical unit focuses the first light beam incident from the first optical unit if the loaded optical disk is the DVD and an emitted second light beam having a wavelength of 780 nm for a CD-R on an information recording surface of the loaded optical disk if the CD-R is the loaded optical disk, transmits the first light beam reflected by the loaded DVD disk to the first optical unit, and detects information from the second light beam reflected by the loaded CD-R disk.

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patent: 5793734 (1998-08-01), Tsuchiya et al.
Patent Abstracts of Japan, Miyairi Nobuo, Publication No. 03268240, Publication Date Nov. 28, 1991.
Patent Abstracts of Japan, Ito Masamichi, Publication No. 63282932, Publication Date Nov. 18, 1988.

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