Optical device for controlling a light beam

Details Optical device for controlling a light beam Optical device for controlling a light beam

1982-04-19

1984-08-21

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 44, 350255, G11B 700

Patent

active

044674635

ABSTRACT:
An optical device for controlling a light beam, for example, in an optical disc player, has an optical element, such as, a lens, acting on a light beam and being carried by a movable member to which a bar magnet is also attached, and a magnet having a closed shape, for example, in the form of a ring, extends around the bar magnet so that the magnetic fields of the bar magnet and the ring-shaped magnet provide magnetic reactive forces tending to maintain the movable member and the lens thereon in a stable balanced position. Further, at least first and second electromagnets are selectively energized to interact with the bar magnet for causing respective movements of the movable member and lens in the direction of the optical axis of the lens for focusing the light beam at a record medium surface, and in a direction at right angles to the optical axis, for example, for varying the position on the record medium surface where the focused light beam impinges.

REFERENCES:
patent: 4135083 (1979-01-01), Van Alen et al.
patent: 4135206 (1979-01-01), Kleuters et al.
patent: 4302830 (1981-11-01), Hamaoka et al.
patent: 4367543 (1983-01-01), Araki et al.
patent: 4408313 (1983-10-01), Musha

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