Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1987-05-22
1989-06-27
Bovernick, Rodney B.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
350252, 350255, 369 44, 369 45, G02B 711
Patent
active
048423920
ABSTRACT:
In an objective lens driving unit, an objective lens (12) is fixed to a coil bobbin (11), which has a focus drive coil (13a) wound therearound with its axis coaxial with the axis of the objective lens (12) and tracking dive coils (13b, 13c) wound thereon with their axes perpendicular with the axis of the objective lens (12), and the focus drive coil (13a) and the tracking drive coils (13b, 13c) are put in an open magnetic field produced by a magnetic yoke (14) having permanent magnets (15a, 15b), which makes magnetic flux to cross the coils, thereby to drive the objective lens (12); thus the size of the unit is decreased and made light, and further, the weight of the moving part is made light, to boost sensitivity thereby.
REFERENCES:
patent: 4669823 (1987-06-01), Iguma et al.
EP0092997, 11-1983, Kido.
Hashimoto Akifumi
Ito Masashi
Itoi Toshiki
Nakamura Hiroyuki
Bovernick Rodney B.
Lerner Martin
Matsushita Electric - Industrial Co., Ltd.
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