Headwheel for a multiple beam optical tape playback system

Details Headwheel for a multiple beam optical tape playback system Headwheel for a multiple beam optical tape playback system

1985-03-25

1986-12-30

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 97, 369112, 360114, G11B 7135

Patent

active

046334556

ABSTRACT:
A multiple track playback headwheel is disclosed for use in a helical scan optical tape recording system. The headwheel includes optical diffraction gratings at the center of rotation of the headwheel positioned normal to the rotational axis. A collimated light beam supplied from a laser external to the headwheel, directed along the rotational axis of the headwheel, is split into a plurality of beams by the gratings. The plurality of beams are imaged at the entrance pupil of the playback objective lens which focuses the beams to diffraction limited spots on the surface of an optical tape having information recorded thereon. The illuminated spots are reflected back through the objective lens and are formed into beams which are directed to an information and tracking detecting apparatus and to a focus detecting apparatus.

REFERENCES:
patent: 3314075 (1967-04-01), Becker et al.
patent: 3600507 (1971-08-01), Newgard
patent: 3770910 (1973-11-01), Rose et al.
patent: 3823276 (1974-07-01), Maslowski et al.
patent: 3969765 (1976-07-01), Roos
patent: 4416001 (1983-11-01), Ackerman et al.
patent: 4459690 (1984-07-01), Corsover et al.
patent: 4479051 (1984-10-01), Musha
patent: 4525828 (1985-06-01), Higashiyama et al.
Juliana, Jr., "Rotating Head Magneto-Optic Station", IBM Tech. Disc. Bul., vol. 15, No. 6, Nov. 1972, pp. 1790-1791.
Wai-Hon Lee, "High Efficiency Multiple Beam Gratings," Applied Optics, vol. 18, No. 13, Jul. 1, 1979, pp. 2152-2158.

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