| 摘要 |
An electromagnetic driving apparatus of an objective lens in an optical data recording and reproducing apparatus including a movable carriage, and an objective lens holder which supports the objective lens to converge laser beams onto the optical disc and which is supported on the carriage to move in focusing and tracking directions. Focusing and tracking coils are provided on the objective lens holder, together with a magnetic circuit including permanent magnets and a yoke member. The yoke member is made of a single piece including a magnetic shield wall having a laser transmission hole opposed to the optical disc, a plurality of yoke walls extending substantially perpendicularly to the magnetic shield wall towards the carriage, and a plurality of mounting flanges extending from the yoke walls to lie on the carriage, so that the mounting flanges can be secured to the carriage.
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