Dynamic information storage or retrieval – Dynamic mechanism subsystem – Having power driven transducer assembly
Patent
1990-12-27
1993-02-16
Levy, Stuart S.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Having power driven transducer assembly
369219, 369 4415, 369 4416, 359823, G11B 7085, G11B 700, G02B 702
Patent
active
051877023
ABSTRACT:
In an apparatus for moving an objective lens, the objective lens (2) mounted on a lens support is suspended on a support frame by tracking leaf springs (6) and focusing leaf springs (8), each of the tracking leaf springs (6) and each of the focusing leaf springs (8) being coupled to each other. Focusing (26a) and tracking (26b) coils are provided on the lens support and are arranged in a magnetic circuit fixed to the support frame. The support frame is movably supported on side rails and coupled to a linear motor mechanism (28). In a long-stroke access, the support frame is moved in a access signal by the linear motor mechanism along a radial direction of an optical disk. In a middle-stroke access or a tracking operation, the magnetic circuit is energized in response to the access signal or a focusing signal so that the tracking leaf spring (6) is deformed by an interaction force between a current supplied to the tracking coils (26b) and magnetic fluxes generated from the magnetic circuit. Thus, the objective lens (2) is moved along the radial direction of the disk within a middle-stroke range. In a focusing operation, the magnetic circuit is energized in response to a focusing signal so that the focusing leaf spring (8) is deformed by the interaction force. Thus, the objective lens is moved along its optical axis.
REFERENCES:
patent: 4557564 (1985-12-01), Van Rosmalen
patent: 4613202 (1986-09-01), Kuriyama
patent: 4797866 (1989-01-01), Yoshikawa
patent: 4862441 (1989-08-01), Yamura et al.
patent: 4958335 (1990-09-01), Takeda et al.
patent: 5001694 (1991-03-01), Lee et al.
patent: 5018836 (1991-05-01), Noda et al.
Kabushiki Kaisha Toshiba
Levy Stuart S.
Rhoa Joseph A.
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