Optical reproducing head

Details Optical reproducing head Optical reproducing head

1980-09-23

1984-07-10

Arnold, Bruce Y.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369103, G02B 532

Patent

active

044589808

ABSTRACT:
An optical reproducing head for reproducing an information signal recorded on an optical record medium includes a semiconductor laser for generating a laser beam, a first off-axis hologram lens irradiated with the laser beam from the semiconductor laser to produce a beam of parallel rays of light that has an optical axis which is off-set with respect to the optical axis of the laser beam, a second off-axis hologram lens irradiated with the beam of parallel rays of light from the first off-axis hologram lens to generate a focused beam which has an optical axis which is off-set with respect to the optical axis of the beam of parallel rays of light and has an optical axis perpendicular to the optical record medium, and a photo-detector detecting the intensity of a non-diffracted wave beam from the first off-axis hologram lens means, the non-diffracted wave beam being at least part of the focused beam which has been reflected from the optical record medium and has been diffracted by the second off-axis hologram lens. The output of the photodetector is used to produce a focus error signal and a tracking error signal for controlling the focus servo and tracking servo operations.

REFERENCES:
patent: 4245882 (1981-01-01), Chang
patent: 4253723 (1981-03-01), Kojima et al.
patent: 4312559 (1982-01-01), Kojima et al.
patent: 4355858 (1982-10-01), Funato et al.
Sincerbox, G. T., "Formation of Optical Elements by Holography", IBM Tech. Disclosure Bulletin, vol. 10, No. 3, Aug. 1967, pp. 2 and 3.
Richtev, A. K. et al., "Holographically Generated Lens", Applied Optics, vol. 13, No. 12, Dec. 1974, pp. 2924-2930.

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