Two axis electro-optical scanning device having orthogonal coils

Details Two axis electro-optical scanning device having orthogonal coils Two axis electro-optical scanning device having orthogonal coils

1991-02-28

1993-03-30

Young, Wayne R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, 359814, 359824, G11B 709

Patent

active

051990148

ABSTRACT:
A scanning device comprises a lens (2) having an optical axis (2a). The lens is movable in a focussing direction (F) to form at least one radiation spot on a surface to be scanned and in a tracking direction (T) oriented transversely of the focussing direction, in order to follow a recording track. The scanning device comprises a stationary section (16) with a magnetic circuit and one air gap (20), and a section (6) which includes the lens and is movable relative to the stationary section. The movable section comprises at least one focussing coil (12) and two tracking coils (14a, 14b) for driving the lens, the focussing coil having a coil axis (12a) extending parallel to the optical axis. The air gap is situated between the optical axis of the lens and the coil axis of the focussing coil. The movable section is secured to the stationary section by a compliant mechanical suspension (22a, 22b), and its mass center is situated in or at least near the air gap.

REFERENCES:
patent: 4321701 (1982-03-01), Arquie et al.
patent: 4443721 (1984-04-01), Jansen
patent: 4988165 (1991-01-01), Ishii et al.
patent: 5018836 (1991-05-01), Noda et al.
patent: 5072433 (1991-12-01), Tanaka
patent: 5073883 (1991-12-01), Mitsumori

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