| 摘要 |
Electromagnetic drive circuitry, for recording information on a flexible magnetic slave disk by contact transfer of information recorded on a flexible magnetic master disk, includes a U-shaped electromagnetic device terminating, respectively, in a first planar pole tip axially aligned with a second movably mounted planar pole tip, to define a closed-loop flux-conducting path extending through a contact-transfer zone between the pole tips. The drive circuitry further includes signal-modulating circuitry for applying an alternating voltage of progressively decreasing amplitude to the electromagnetic device, to develop an alternating magnetic field of progressively diminishing strength in the closed-loop flux-conducting path that produces a corresponding alternating magnetic transfer field extending axially in the contact-transfer zone between the planar pole tips.
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