Optical pickup apparatus for detecting and correcting focusing a

Details Optical pickup apparatus for detecting and correcting focusing a Optical pickup apparatus for detecting and correcting focusing a

1987-09-02

1989-12-05

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, 350 9612, 350 9614, 350 9615, G11B 700

Patent

active

048857327

ABSTRACT:
An optical pickup apparatus comprises an optical waveguide disposed to receive a light beam reflected by an optical recording medium, first and second focusing grating couplers disposed side by side on the optical waveguide for coupling the reflected light beam into the optical waveguide and converging the optical wave guided through the optical waveguide to positions spaced from each other, and first and second photodetectors secured to the optical waveguide for respectively detecting the optical waves converged by the first and second focusing grating couplers so that reading out of recorded information, detection of tracking error and detection of focusing error can be effected. Or, the optical pickup apparatus comprises a grating lens disposed to receive and split the reflected light beam from an optical path of the light beam advancing toward the optical recording medium and to converge the reflected light beam, and a photodetector for detecting the reflected light beam passing through the grating lens so that reading out of recorded information, detection of a tracking error and detection of a focusing error can be effected.

REFERENCES:
patent: 4672187 (1987-06-01), Fujita et al.
patent: 4718052 (1988-01-01), Kondo et al.
patent: 4737946 (1988-04-01), Yamashita et al.
patent: 4797867 (1989-01-01), Sunagawa et al.
Patents Abstracts of Japan, vol. 10, No. 229, (P-485)(2285), 8-8-86.

Affiliated with

Also associated with

Rating

Optical pickup apparatus for detecting and correcting focusing a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical pickup apparatus for detecting and correcting focusing a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pickup apparatus for detecting and correcting focusing a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2038801