Title: Record carrier and device for playing back same

Abstract: A recording device for storing and playing back information in which mechanical deformations which are representative of the stored information are provided in the surface of a record carrier consisting of a permanent magnetizable material or being covered with such a material. As a playback element is present a sheet of monoaxial magnetizable material which comprises a single-walled magnetic domain ("bubble"). The size of the domain is modulated upon moving the recording medium with respect to the sheet. Deposition of the domain in the sheet upon playing back can be corrected by way of fine control.

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Inventors: de Jonge, Frederik Ate (Eindhoven, NL)

Application Number: 640485
Filing Date: 1975-12-15
Publication_date: 1977-03-15
Assignee: U.S. Philips Corporation (New York, NY)
Primary Class(es): 360/77.02 360/55, 360/77.03, 360/77.06, 360/110
Other Classes:
US Patent Ref:

3793639

Feb, 1974

Enz et al.

360/110.

Other Refs:
Primary Examiner: Eddleman, Alfred H.
Assistant Examiner:
Attorney: Trifari; Frank R., Cohen; Simon L.