Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-04-09
1998-08-11
Chan, Eddie P.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4423, 369 4437, 369 94, 369 4424, 369118, G11B 700
Patent
active
057937346
ABSTRACT:
To reduce a weight of an optical pickup device that may reproduce information recorded in a plurality of kinds of optical discs having different use wavelengths, a laser beam light source 1 and a hologram optical unit 14 are provided as light sources for emitting light to reproduce the information of the optical discs having different use wavelength. In order to introduce the light into recording layers of the optical discs 2a and 2b, an actuator moving area 7 is disposed in the emission space of the light. The actuator moving area 7 is composed of a numerical-aperture-controlling filter 8 and an objective lens 9. Due to the change of the focusing position of the objective lens 9 by the numerical-aperture-controlling filter 8 in response to a kind of the optical discs 2a and 2b, the light beam is optimally converged to the recording layers of the optical discs 2a and 2b, respectively.
REFERENCES:
patent: 5625613 (1997-04-01), Kato et al
patent: 5638353 (1997-06-01), Takahashi
patent: 5659533 (1997-08-01), Chen et al.
Chino Toshinori
Kitamura Atsushi
Tsuchiya Rikio
Chan Eddie P.
Chu Kim-Kwok
Minebea Co. Ltd.
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