Optical head device using cross-polarized from a light source fo

Details Optical head device using cross-polarized from a light source fo Optical head device using cross-polarized from a light source fo

1990-01-19

1992-09-29

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4414, 369112, G11B 700

Patent

active

051518899

ABSTRACT:
An optical head system for optically recording and reproducing information on and from an optical recording medium. The optical head system comprises a light source for emitting a light beam, a collimator lens for causing the light beam from the light source means to become a parallel light beam, and an objective lens for converging the parallel light beam from the collimator lens on the optical recording medium. Between said collimator lens and the objective lens is provided a first optical device for reflecting the light beam returning from the optical recording medium. Also included is a second optical device for separating the light beam from the first optical device to generate two light beams, the two separated light beams directing in the substantially same direction and being separated by a predetermined distance from each other. The two separated light beams from said second optical device are separately incident on a photodetector assembly. The photodetector assembly comprises first and second light-receiving portions which are placed on a common substrate. One of the two separated light beam is incident on the first light-receiving portion so as to obtain a focus error signal and the other separated light beam is incident on the second light-receiving portion so as to obtain a tracking error signal.

REFERENCES:
patent: 4694447 (1987-09-01), Cohen et al.
patent: 5036504 (1991-07-01), Ono et al.
Topical Meeting on Optical Data Storage, Mar. 11, 1987, Stateline, Nev.
Westney & Swaby: "Disk Drive Optics: Design Factors affecting manufacturing and cost in volume".

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