Apparatus for recording and reproducing optical information havi

Details Apparatus for recording and reproducing optical information havi Apparatus for recording and reproducing optical information havi

1994-01-27

1995-05-23

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4423, 369112, 369121, 385 14, 385 36, 385130, G11B 709

Patent

active

054187656

ABSTRACT:
A focal point position detector has a light source for emitting light; an optical system for converging light from the light source to an optical recording medium; a coupler for coupling light from the optical recording medium thereto; a waveguide concave mirror for converging light from the coupler; a waveguide convex mirror for slightly reducing a converging degree of light from the waveguide concave mirror; and photodetectors for receiving light from the waveguide convex mirror, The coupler, the waveguide concave and convex mirrors and the photodetectors are integrally formed on a substrate, An apparatus for recording and reproducing optical information has a light source; an optical system for converging light emitted from the light source; an optical waveguide; a coupler for coupling the converged light to the optical waveguide; two waveguide mirrors arranged such that reflected light from the coupler is continuously reflected on the waveguide mirrors; and a photodetector for detecting the light reflected on the waveguide mirrors. The coupler, the optical waveguide, the waveguide mirrors and the photodetector are integrally formed on the same substrate.

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