Light modulator and optical head adjustment method

Details Light modulator and optical head adjustment method Light modulator and optical head adjustment method

1994-08-04

1996-05-07

Hindi, Nabil Z.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, G11B 700

Patent

active

055153550

ABSTRACT:
The present invention sets the position of each apparatus of a detecting system and an emitting system without using a reference disk in assembling an optical head. A light signal similar to reflected light of a reference disk is generated by a light modulator comprising a Faraday rotator for rotating a plane of polarization proportionally to the current by setting a solenoid coil having a large Faraday constant set around a piece of glass and electrifying the solenoid coil, a convex lens connected to a mechanism which moves along the optical axis in accordance with the applied current, a target section having a light detecting target with a groove formed on the surface and a light reflecting member set to the groove on the optical axis and connected to a mechanism moving along the radial direction of a disk in accordance with an applied current, so as to perform positioning by using the generated signal as a servo signal.

REFERENCES:
patent: 5410532 (1995-04-01), Ohno et al.

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