Optical head and optical memory device

Details Optical head and optical memory device Optical head and optical memory device

1993-12-08

1995-07-25

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4423, 369 4441, 369112, 369109, 2502015, G11B 700

Patent

active

054368766

ABSTRACT:
A small and inexpensive optical head for detecting a recorded signal, a focusing error signal and a tracking error signal, and an optical memory device utilizing the optical head. A diffraction device (103) is provided having two chirped grating regions (103A, 103B) for dividing a light beam from an optical recording medium (105) and directing the divided beams toward four band-shaped photoelectric transducers (106) and an astigmatism generator formed by the diffraction device (103) and a positive lens (102). The four photoelectric transducers are positioned in a plane inclined with respect to the optical axis of zero-order diffraction light, and the longitudinal axes of each of the band-shaped photoelectric transducers are radially arranged relative to the optical axis.

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Japanese Patent Abstract, vol. 10, No. 127, May 13, 1986, Appln. No. 59-106200.

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