Optical pickup device for reading information on an optical disk

Details Optical pickup device for reading information on an optical disk Optical pickup device for reading information on an optical disk

1990-12-11

1991-11-26

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4414, G11B 7085

Patent

active

050688456

ABSTRACT:
Disclosed is an optical pickup device for use in an optical disk unit, which comprises a moving optical system and a fixed optical system. The moving optical system has a focussing lens confronting a disk-shaped information-recording medium and moves linearly in the radial direction of the information-recording medium. On the fixed optical system are disposed a beam-deflecting lens as tracking means and a relay lens for conjugating the position of the principal point of this beam-deflecting lens with the position of the focal point on the beam-incident side of the object lens when the moving optical system is present at an intermediate position within the moving range of the moving optical system. In the optical pickup device having this structure, track offset can be diminished over the entire reproduction region, and since no tracking means is disposed in the moving optical system, high-speed excess can be easily performed.

REFERENCES:
patent: 4353624 (1982-10-01), Yonekubo
patent: 4586814 (1986-05-01), Tokuhara
patent: 4618234 (1986-08-01), Ikari
patent: 4688201 (1987-08-01), Towner
patent: 4782474 (1988-11-01), Asai et al.
patent: 4785438 (1988-11-01), Mizunoe
patent: 4959824 (1990-09-01), Ueda et al.
"Experiment of High-Speed Access Optical Device"; Collection of Lectures at the Spring Meeting 1985 of the Japanese Association of Precision Machines, No. 146, Junichi Ichihara, pp. 667 and 668 and partial translation.
"A High-Stiffness Optical Head for Quick Access and Precise Tracking Access" (SPIE vol. 529, Optical Mass Data Storage (1985)); pp. 150-155; Watabe, Akinore, et al.

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