Optical head apparatus for different types of disks

Details Optical head apparatus for different types of disks Optical head apparatus for different types of disks

1996-06-05

1997-12-09

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, G11B 700

Patent

active

056967500

ABSTRACT:
In an optical head apparatus for two or more different types of discs, there are provided a first light source for a first wavelength light beam, a second light source for a second wavelength light beam, and an objective lens for leading the first and second wavelength light beans to one of the discs. A holographic optical element is provided to converge or diverge only one of the first and second wavelength light beams. Or, an aperture limiting element is provided to adjust an effective numerical aperture of the objective lens for only one of the first and second wavelength light beams.

REFERENCES:
patent: 5202860 (1993-04-01), Takahashi et al.
patent: 5450378 (1995-09-01), Hekker
Y. Komma et al., "Dual Focus Optical Head for 0.6 mm and 1.2 mm Disk", Optical Review vol. 1 , No. 1, pp. 27-29, 1994.

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