Objective lens driving device and optical disc apparatus...

G - Physics – 11 – B

Patent

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Details

G11B 7/09 (2006.01) G02B 7/09 (2006.01) G11B 7/135 (2006.01) G11B 7/00 (2006.01) G11B 7/125 (2006.01)

Patent

CA 2213308

It is an object to perform a thin and compact design of the objective lens driving device. In order to achieve the above object, optical beam is passed through a space surrounded by a tracking coil and a focusing coil which are adjacent to each other and fixed in a holder. Further, it is another object to position the objective lens with high precision in an objective lens driving device for switching a plurality of objective lenses in accordance with the type of an optical disc. In order to achieve this object, magnetic substances which are radially extended with the sliding shaft at the center are provided in the lens holder, and the magnetic substances are located within a plane perpendicular to the plane constituting the magnetic gap and at the outside of the magnetic gap. Still further, in an objective lens driving device it is another object to prevent the occurrence of positional displacement of the objective lens due to resistance force of current supply means such as FPC. To achieve this object, a first objective lens and a second objective lens are arranged so that the objective lens arrangement angle at which the first and second objective lenses are arranged with respect to the shaft center of the sliding shaft is displaced, by a predetermined amount, from the magnetic circuit arrangement angle at which the magnetic substances and the magnets are arranged with respect to the shaft center of the sliding shaft.

L'objet de cette invention est de produire un dispositif d'entraînement d'objectif de design mince et compact. Pour ce faire, un rayon lumineux est transmis dans une zone entourée d'une bobine de repérage et d'une bobine de concentration adjacentes et fixées sur un support. Selon un deuxième objet, on place l'objectif avec beaucoup de précision dans un dispositif d'entraînement pour commuter plusieurs objectifs en fonction du type de disque optique. Pour ce faire, des substances magnétiques, qui sont étendues radialement avec l'arbre glissant au centre, sont fournies dans le support de l'objectif, et les substances magnétiques sont disposées à l'intérieur d'un plan perpendiculaire au plan constituant un entrefer magnétique et à l'extérieur de l'entrefer magnétique. Selon un autre objet, on peut prévenir les déplacements de l'objectif causés par la force de résistance des moyens d'alimentation actuels, comme les circuits imprimés souples. Pour ce faire, un premier objectif et un second objectif sont disposés de façon à ce que leur angle de montage, par rapport au centre de l'arbre glissant, soit déplacé de façon prédéterminée à partir de l'angle de montage du circuit magnétique auquel les substances magnétiques et les aimants sont disposés en fonction du centre de l'arbre glissant.

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