Optical head using hologram lens for both beam splitting and foc

Details Optical head using hologram lens for both beam splitting and foc Optical head using hologram lens for both beam splitting and foc

1986-05-06

1988-03-15

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, 369112, 350 372, G11B 712

Patent

active

047317728

ABSTRACT:
An improved optical head which eliminates the need for a biprism or cylindrical lens for focus detection and allows the placement of a photodetector immediately adjacent to the semiconductor laser to reduce alignment problems and vibrational errors. A semiconductor laser is provided which produces a laser beam which impinges upon a movable objective lens. The objective lens focuses the laser beam onto an information medium. A diffraction grating, which may be holographic, is placed between the laser and the objective lens. The diffracted beams on the forward path from the laser to the objective lens are not used, but on the return path, one of the diffracted beams is focused onto a photodetector which is in the same plane as the semiconductor laser.

REFERENCES:
patent: 4253723 (1981-03-01), Kojima et al.
patent: 4458980 (1984-07-01), Ohki
patent: 4624526 (1986-11-01), Tsukai et al.
patent: 4626679 (1986-12-01), Kawayama et al.
G. L. Rogers, "Artificial Holograms and Astigmatism", Proceedings of the Royal Society of Edinburg, vol. LXIII-Part IV (No. 22), 1952.
Yu. S. Mosyakin and G. V. Skrotskii, "Use of Holograms as Optical Elements" (review). Soviet Journal of Quantum Electronics, vol. 2, No. 3, pp. 199-206, 1972.
Wai-Hon Lee, "Binary Synthetic Holograms", Appl. Opt., vol. 13, pp. 1677-1682, 1972.
O. Bryngdahl, "Computer-Generated Holograms as Generalized Optical Components", Optical Engineering, vol. 14, No. 5, pp. 426-435, 1975.

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