Optical head

Details Optical head Optical head

1993-05-20

1994-02-01

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 369112, G11B 709

Patent

active

052837726

ABSTRACT:
An optical head comprising a diffracting element having two tracking diffracting regions separated by a division line extending in a direction corresponding to a track direction of a recording medium, and one focusing diffracting region separated from the tracking diffracting regions by a division line extending in a direction corresponding to a radial direction of the recording medium. The optical head further comprises a light receiving element having two tracking light receiving regions for receiving diffracted lights produced in the tracking diffracting regions, and two adjoining focusing light receiving regions for receiving a diffracted light produced in the focusing diffracting region. The diffracted light produced in the focusing diffracting region always has a substantially constant light intensity, even when a tracking error occurs. As a result, an offset can be prevented from occurring in a focus error signal by finely adjusting the diffracting element.

REFERENCES:
patent: 4817074 (1989-03-01), Yamanaka
patent: 5115423 (1992-05-01), Maeda et al.
Microoptics News, Hodic Circular, The Japan Society of Applied Physics, May 26, 1989, vol. 7, No. 2.
CD Pickup Using a Holographic Optical Element, The Japan Society of Precision Engineering (JSPE)-56-10 '90-10-1775.

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