Write-once optical disc, and method and apparatus for...

Details Write-once optical disc, and method and apparatus for... Write-once optical disc, and method and apparatus for...

2007-11-27

2007-11-27

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

10928663

ABSTRACT:
An optical pickup head includes a light emitting and receiving unit (1), a first lens (2), a second lens (3), and a beam splitter (4). The light emitting and receiving unit (1) includes a semiconductor laser (10) generating laser beams with different wavelengths which irradiate an optical disk, and a photo detector (11) receiving laser beams reflected by the optical disk. The first lens faces the light emitting and receiving unit. The first lens includes an aspheric lens portion (20) with a pair of opposite surfaces, and a diffraction grating (21) formed on the surface of the aspheric lens portion which faces the light emitting and receiving unit. The second lens is similar to the first lens, and faces the optical disk for converging laser beams thereto. The beam splitter is located between the first and second lenses.

REFERENCES:
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patent: 99124458 (2000-07-01), None
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patent: 1194346 (2005-03-01), None
patent: 594225 (2004-06-01), None

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