Optical pickup device

Details Optical pickup device Optical pickup device

1998-09-24

2000-10-17

Edun, Muhammad

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4414, 369112, G11B 712

Patent

active

061341959

ABSTRACT:
A recording/reproducing apparatus for recording and/or reproducing the information on or from an optical recording medium by illuminating laser light on it using a double-lens type objective lens unit made up of at least a first lens and a second lens. The apparatus includes a light source for radiating laser light, a first lens for converging the laser light radiated from the light source, a second lens arranged between the first lens and the optical recording medium, a detection unit for detecting the sort of the recording medium and a piezoelectric element for causing relative movement between the first and second lenses for varying the distance between the two lenses in the direction along the optical axis. Specifically, the second lens is moved by a movement unit responsive to the results of detection by the detection unit to vary the separation between the first and second lenses. This increases the numerical aperture NA and reduces the effect of aberration to enable high-density recording and/or reproduction of information signals.

REFERENCES:
patent: 5004307 (1991-04-01), Kino et al.
patent: 5125750 (1992-06-01), Corle et al.
patent: 5497359 (1996-03-01), Mamin et al.
patent: 5729393 (1998-03-01), Lee et al.
patent: 5917788 (1999-06-01), Mowry

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