High density magnetic recording apparatus including a hologram t

Details High density magnetic recording apparatus including a hologram t High density magnetic recording apparatus including a hologram t

1998-07-06

2000-10-03

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7703, G11B 5596

Patent

active

061281557

ABSTRACT:
A magnetic recording apparatus including a magnetic head portion 9, a light emitting portion 10b emitting a light beam, a hologram portion 10a, a light receiving portion 10c, a carriage 12 and a control portion 16 for positioning the magnetic head portion 9 to a predetermined position. The hologram portion 10a is in a plate-like shape and has on one major surface a first gold reflection surface 10a3 formed on a first thing film layer 10a1 and on the other major surface a second gold reflection surface 10a4 formed on a second thin film layer 10a2. The hologram portion 10a also includes a light path 10a5 that guides the light beam in a zig-zag manner between the first and the second reflection surfaces 10a3 and 10a4 and optical components 10a8, 10a9, 10a10 for converting the light emitted from the light emitting portion 10b into a positioning light beam.

REFERENCES:
patent: 5121371 (1992-06-01), Farnsworth et al.
patent: 5311378 (1994-05-01), Williams et al.
patent: 5317551 (1994-05-01), Shiono
patent: 5534693 (1996-07-01), Kondo et al.
patent: 5701289 (1997-12-01), Nagano
patent: 5999498 (1999-12-01), Handa et al.

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