Hard disc drive and a servo signal writing apparatus

Details Hard disc drive and a servo signal writing apparatus Hard disc drive and a servo signal writing apparatus

1992-05-26

1994-06-28

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4414, 369 4419, 369215, 369222, 360 7703, G11B 5596, G11B 700

Patent

active

053253493

ABSTRACT:
A hard disc drive is comprised of a casing, a head arm located in the casing and movable in unison with a head, and a diffraction grating mounted on the head arm so as to diffract a light introduced into the casing from the outside of the casing, in which a light diffracted by the diffraction grating is introduced to the outside of the casing. Also, this hard disc drive further comprises an optical system provided outside the casing for receiving the diffracted light, the optical system detecting the arm position, a controller for controlling the arm position, and a servo signal writer for writing a servo signal on the disc on the basis of a detected signal.

REFERENCES:
patent: 4794586 (1988-12-01), Korth
patent: 4797754 (1989-01-01), Sugano et al.
patent: 5079755 (1992-01-01), Hangai et al.
patent: 5121371 (1992-06-01), Farnsworth et al.
patent: 5140571 (1992-08-01), Nishida et al.
patent: 5162955 (1992-11-01), Burdenko
patent: 5164863 (1992-11-01), Janz
patent: 5179485 (1993-01-01), Tamayama
patent: 5193034 (1993-03-01), Tsuyoshi et al.

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