| 摘要 |
An apparatus of the invention is capable of shifting a transducer, such as a head for erasing, reproducing and recording information on a track formed on a recording medium, with fine positioning accuracy and high access speed. Further, the apparatus is capable of entirely erasing information to be erased on the medium by shifting the transducer with a desired degree while the transducer is excited for erasing operation. In the apparatus, a motion converting means, such as a disc cam or a helically grooved cylindrical cam, is employed for converting a primary rotating motion to a secondary stepwise motion so as to shift the transducer, presenting substantial dead band characteristics for the shifting motion. Further, a control means is employed for shifting the transducer over an area covering an information recorded track and the portions adjacent thereto to execute the erasing operation for an extended area along the track to be erased.
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