Driving device for objective lens

G - Physics – 11 – B

Patent

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Details

G11B 7/135 (2006.01) G11B 7/09 (2006.01)

Patent

CA 2093204

To provide a driving device for an objective lens that has a high driving sensitivity and superior driving frequency characteristics. The present invention relates to a device for driving the objective lens (1) of an optical head that uses a device for recording information on an optical information recording medium, and for reproducing information therefrom, by irradiating a beam of light thereon while positioning and focusing the light with respect to an information track on the optical information recording medium. The device has a loose linkage member which supports an objective lens within a cylindrical member and comprises the cylindrical member (14) and a cylindrical hole portion (19) into which the cylindrical member is inserted so as to face the cylindrical hole with an air gap therebetween and with the axes thereof oriented vertically, and the driving force generated by a tracking coil (3) is transmitted through this loose linkage member to the objective lens.

Un dispositif d'entraînement pour objectif possédant un niveau d'entraînement très sensible et des caractéristiques de fréquence d'entraînement supérieures est fourni. La présente invention est reliée à un dispositif d'entraînement pour objectif (1) d'une tête optique se servant d'un dispositif pour enregistrer de l'information sur un support d'enregistrement optique et pour reproduire cette information en irradiant un faisceau lumineux sur le support tout en positionnant et en faisant converger la lumière par rapport à une piste d'information se trouvant sur le support d'enregistrement optique. Le dispositif est muni d'une pièce de liaison mobile qui soutien un objectif à l'intérieur d'une pièce cylindrique, et qui comprend la pièce cylindrique (14) et un trou cylindrique (19) dans lequel la pièce cylindrique est insérée de façon à faire face au trou, et ce, en gardant une distance libre entre eux et en orientant les axes verticalement. La force motrice générée par une bobine d'alignement (3) est transmise à l'objectif au moyen de cette liaison mobile.

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