Dual-focus optical pickup for different thicknesses of recording

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

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369 4437, 369109, 369 94, G11B 709

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active

057372950

ABSTRACT:
A dual-focus optical pickup for both 0.6 mm and 1.2 mm disks utilizes a hologram lens for diffracting a generated laser light beam into .+-.1st order light beams and an objective lens for focusing the diffracted light beams onto the disks, for increasing light efficiency and being less sensitive to optical axis variations. Since the .+-.1st order light beams are used simultaneously, light efficiency is not lowered. Also, since a simplified protrusion- and depression-shaped hologram pattern is used, the device is easy to manufacture and assemble, and exhibits stable optical performance, even under changing optical axis conditions.

REFERENCES:
patent: 3913076 (1975-10-01), Lehureau
patent: 3971002 (1976-07-01), Bricot et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5446723 (1995-08-01), Best et al.
patent: 5526336 (1996-06-01), Park et al.
patent: 5563873 (1996-10-01), Ito et al.
Y. Komma et al., "Dual Focus Optical Head for 0.6 mm and 1.2 mm Disks,"Optical Review, vol. 1, No. 1 (1994), pp. 27-29.

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