Optical beam focusing and tracking system for an optical disk in

Details Optical beam focusing and tracking system for an optical disk in Optical beam focusing and tracking system for an optical disk in

1991-10-03

1993-10-12

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

368112, 2502015, G11B 2100

Patent

active

052532364

ABSTRACT:
A mask is used to remove substantially all of the first order diffraction components of a reflected light beam which are generated as the beam crosses grooved data tracks in an optical media. The mask may comprise a transparent substrate with an opaque layer having a pair of circular apertures or a bow-tie shaped aperture. The apertures are located outside the regions of interference between the diffracted components and the undiffracted component. The layer may be made of a reflective material for reflecting diffracted components of the reflected beam to a tracking error sensor. The layer may be made of a holographic material for deflecting the diffracted components to a tracking error sensor.

REFERENCES:
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patent: 4705940 (1987-11-01), Kohno
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patent: 4817074 (1989-03-01), Yamanaka
patent: 4913524 (1990-04-01), Kreuzer
patent: 5036185 (1991-07-01), Ando
patent: 5113386 (1992-05-01), Whitehead et al.
patent: 5126563 (1992-06-01), Aikoh et al.
Y. Kimura et al., High Performance Optical Head Using Optimized Holographic Optical Element, Jpn. J. Appl. Phys, (1987) Supp. 26-4.

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