Optical disk pickup device including waveguide with separate int

Details Optical disk pickup device including waveguide with separate int Optical disk pickup device including waveguide with separate int

1994-02-03

1996-01-02

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 700

Patent

active

054815169

ABSTRACT:
An optical pickup device for an optical disk includes a semiconductor laser, an optical waveguide for propagating the laser beam, at output grating coupler for focusing the propagated beam through the optical waveguide onto one point of a optical disk, an input grating coupler for coupling a beam reflected and diffracted from the optical disk into the optical waveguide and for dividing the beam to detect focus and tracking error signals, and photodiodes for detecting the beam coupled into the optical waveguide by the input grating coupler. The photodiodes include a 3-piece-divided photodiode for detecting readout signals and focus error signals, and a 2-piece-divided photodiode for detecting tracking error signals. The optical waveguide, output grating coupler, input grating coupler, and the photodiodes are integrated on the surface of a slab substrate, allowing the optical pickup to be miniaturized and made light, and thus allowing the access time to be faster.

REFERENCES:
patent: 4779259 (1988-10-01), Kono et al.
patent: 4929044 (1992-05-01), Arimoto et al.
patent: 5081615 (1992-01-01), Sunagawa
patent: 5119355 (1992-06-01), Yamamoto et al.
patent: 5128915 (1992-07-01), Yamashita et al.
patent: 5153860 (1992-10-01), Sunagawa et al.
patent: 5161148 (1992-11-01), Hori et al.
patent: 5164930 (1992-11-01), Sugiura
patent: 5317551 (1994-05-01), Shiono

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