Flying type optical head integrally formed with light source and

Details Flying type optical head integrally formed with light source and Flying type optical head integrally formed with light source and

1994-02-17

1996-01-02

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369109, 369112, 369 4414, G11B 700

Patent

active

054813867

ABSTRACT:
The optical head is arranged such that a semiconductor laser and a photodetector are formed via a buffer layer on the same substrate; and an opening portion is formed in the substrate under the semiconductor laser and the photodetector. This optical head is further arranged by that the opening portion is filled with a first transparent layer; a diffraction grating is formed on a lower surface of the first transparent layer; a second transparent layer is stacked on a lower surface of the first transparent layer; and a condenser lens is formed on a lower surface of the transparent layer. In this optical head, laser light emitted from the semiconductor laser is penetrated through the substrate, the first transparent layer, the diffraction grating, and the second transparent layer, and condensed toward a place just under the condenser lens by the condenser lens, thereby forming a light spot on an optical storage medium positioned apart from the condenser lens, whereas reflection light reflected from the optical storage medium is penetrated through the condenser lens and the second transparent layer, diffracted by the diffraction grating toward a light receiving plane of the photodetector, and further penetrated through the first transparent layer to be received by the photodetector.

REFERENCES:
patent: 4876680 (1989-10-01), Misawa et al.
patent: 5105403 (1992-04-01), Kando et al.
patent: 5377177 (1994-12-01), Horinouchi et al.

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