Tracking servo device for optical storage disk using optical def

Details Tracking servo device for optical storage disk using optical def Tracking servo device for optical storage disk using optical def

1987-07-27

1990-03-20

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 7135, G11B 709, G02B 610

Patent

active

049107232

ABSTRACT:
A tracking servo device for changing a position on an optical storage disk, at which the storage disk is irradiated by a light beam. The servo device is responsive to a tracking error signal indicative of a deviation of the irradiated position on the disk with respect to a recording track provided on the disk. The tracking servo device includes an optical deflector element having a waveguide disposed in a path of the light beam, for guiding the light beam therethrough toward a surface of the optical storage disk, so as to deflect the light beam during propagation thereof through the waveguide. The device further has a deflection control arrangement for controlling an angle of deflection of the light beam by the optical deflector element, based on the tracking error signal.

REFERENCES:
patent: 4478483 (1984-10-01), Sprague
patent: 4718052 (1988-01-01), Kondo et al.
patent: 4747090 (1988-05-01), Yamashita et al.
patent: 4767170 (1988-08-01), Mizutani et al.
Takizawa, Electrooptic Fresnel Lens-Scanner with an Array of Channel Waveguides, 8/15/83, Applied Optics, pp. 2468-2473.

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