Apparatus for driving objective lens

Details Apparatus for driving objective lens Apparatus for driving objective lens

1982-01-07

1984-09-18

Punter, William H.

Brakes

Wheel

Transversely movable

188380, 350255, G02B 711, F16F 1300

Patent

active

044720246

ABSTRACT:
In an apparatus for driving an objective lens which projects a light spot onto an information track recorded spirally or concentrically on a disc-shaped record medium to read out information, a lens holder for holding the objective lens is supported by an intermediate cylindrical member by means of a pair of upright leaf springs movably in a tracking direction, the intermediate cylindrical member is then supported by an outer fixed cylindrical member via a pair of spiral leaf springs movably in a focussing direction parallel to an optical axis of the objective lens, dampers made of elastic material are secured to the upright leaf springs and the spiral leaf springs so as to suppress resonance caused by the leaf springs. Therefore, precise focussing and tracing controls can be carried out without being affected by the undesired resonance of the leaf springs.

REFERENCES:
patent: 2714161 (1955-07-01), Featherstun
patent: 3143883 (1964-08-01), Nakasone
patent: 3843188 (1974-10-01), Kirschner
patent: 4023651 (1977-05-01), Healiss
patent: 4135206 (1979-01-01), Kleuters et al.
patent: 4367543 (1983-01-01), Araki et al.
Figler, B. D., "Precision Focus Control" Proc. Soc. of Photo-Optical Instrumention Engrs., SPIE, vol. 141, 1978, pp. 43-49.

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