Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-11-08
1999-10-12
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4414, 369 4421, G11B 700
Patent
active
059663545
ABSTRACT:
A first objective lens and a second objective lens are fixedly mounted on a lens holder. The lens holder has four magnetic members embedded in a side thereof about an axis of rotation. The magnetic members are associated with coils respectively. The lens holder is rotatable supported by a support which has four permanent magnets fixedly mounted on a side thereof corresponding to the four coils. A pair of the magnets located opposite to each other is for the focusing control and the other pair of the magnets located opposite to each other is for the tracking control and the objective lens switching control. When the coils corresponding to the magnets are loaded with a switching signal, they turns the lens holder to switch the objective lenses from one to the other. When the coils corresponding to the magnets are loaded with a tracking drive signal, they perform the tracking control. When the coils corresponding to the magnets are loaded with a focusing drive signal, they perform the focusing control. At the beginning of operation, the objective lens drive apparatus can be initialized by feeding the switching signal to either pair of the coils so that the objective lens is set across a light path.
REFERENCES:
patent: 5216534 (1993-06-01), Boardman et al.
patent: 5235581 (1993-08-01), Miyagawa
patent: 5687154 (1997-11-01), Tsuchiya et al.
patent: 5729510 (1998-03-01), Kasahara et al.
Patent Abstracts of Japan, vol. 017, No. 366 (P-1571), Jul. 9, 1993 JP 05 054406 A (Matsushita Electric Ind Co Ltd), Mar. 5, 1993.
Kasahara Akihiro
Takahashi Naomasa
Kabushiki Kaisha Toshiba
Tran Thang V.
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