Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1985-05-08
1987-10-27
Corbin, John K.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 45, 336198, G02B 704
Patent
active
047025557
ABSTRACT:
An objective lens drive unit including a bobbin wound with driving coils and having mounted thereon a lens for transmitting a light beam which is controlled by drive currents flowing through the coils is used for controlling the focussing/tracking of the light beam on a recording medium. The bobbin comprises a hole mounting the objective lens, first recesses formed in opposed side walls of the bobbin substantially in parallel with the mounting hole for accommodating one of the coils wound substantially perpendicularly to the mounting hole, notches formed in the first recesses parallel with the mounting hole for accommodating passing terminal end/start portions of the coil, and second recesses formed along two opposed sides of the opposite side walls for accommodating the other coils wound so as to intersect each other at the other pair of opposite side walls of the bobbin. The windings are retained by projections so that a continuous winding on the recesses can be completed, and thickened portions on the outer walls of the bobbin are bonded to the windings to increase the dynamic rigidity of the bobbin vibrating at frequencies of up to 20 kHz.
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Ieki Kouichi
Iguma Akira
Okuda Tadashi
Sasamoto Toshio
Ben Loha
Corbin John K.
Hitachi , Ltd.
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