Pick-up head for optical information storage disk

Details Pick-up head for optical information storage disk Pick-up head for optical information storage disk

1986-10-15

1989-01-10

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 46, 369112, 350 9611, G11B 7095

Patent

active

047978678

ABSTRACT:
A pick-up head for use with an optical information storage disk includes an optical waveguide, a light source, a waveguide lens, a focusing grating coupler, and a light detector. Wave light generated by the light source and propagated via the wave guide lens through the optical waveguide is deflected by a surface elastic wave generated by an inter-digital transducer. The inter-digital transducer is controlled by a tracking error signal to vary the frequency of the surface elastic wave to change the deflection angle of the wave light in order to eliminate any tracking error to which a light spot on the optical disk is subjected. Focusing control may be effected by a conventional focusing control mechanism or a bimorph driven by a focusing error signal.

REFERENCES:
patent: 4193091 (1980-03-01), Kleuters
patent: 4385798 (1983-05-01), Yevick
patent: 4394060 (1983-07-01), Verber et al.
patent: 4425023 (1984-01-01), Matsumoto et al.
patent: 4545046 (1985-10-01), Jansen et al.
patent: 4672187 (1987-06-01), Fujita et al.

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