Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1998-10-20
1999-12-07
Hindi, Nabil
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369112, G11B 700
Patent
active
059995076
ABSTRACT:
A lens holder is provided with objective lenses of different types. Rotating the lens holder causes one of the objective lenses to be placed in the optical path of the laser beam. Near one objective lens, there is provided a reflecting element that reflects part of the laser beam directed to the objective lens. When the objective lens is put in the optical path, the beam from the reflecting element is sensed by a sensor. From the sensing result, it is judged that a specific type of objective lens is in the optical path. Accordingly, there is provided an objective lens driving apparatus that includes at least two objective lenses with different numerical apertures according to optical information recording mediums complying with different standards, is capable of switching between the objective lenses according to the optical information recording medium to be used, and further has a simple structure capable of identifying the type of the objective lens selected by switching.
REFERENCES:
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5673247 (1997-09-01), Sekimoto et al.
patent: 5687154 (1997-11-01), Tsushiya et al.
patent: 5729510 (1998-03-01), Kasahara et al.
Hindi Nabil
Kabushiki Kaisha Toshiba
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