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Title: Magnetic transfer record film and apparatus for magneto-optically reading magnetic record patterns using the same

Abstract: A magnetic transfer record film employed for magneto-optically reading magnetic record patterns. The magnetic transfer record film is formed, as the principal component, of an alloy of a heavy rare earth metal and a transition metal and has an easy axis of magnetization in a direction perpendicular to the film surface and further has an alloy composition included in a range of .+-.10% at the periphery of a center alloy composition where the saturation magnetic moment becomes minimum with respect to a change of the composition within a temperature range used. The magnetic transfer record film is deposited on a transparent substrate and positioned closely to a magnetic record medium on which a magnetic record pattern to be observed is stored, so that the magnetic record pattern is transferred to the magnetic transfer record film. An optical system is provided to magneto-optically read out the transferred magnetic record pattern from the magnetic transfer record film.


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Inventors: Imamura, Nobutake (Tokyo, JP)
Mimura, Yoshinori (Tachikawa, JP)
Kobayashi, Toshihiko (Mitaka, JP)

Application Number: 933651
Filing Date: 1978-08-14
Publication_date: 1980-05-06
Assignee: Kokusai Denshin Denwa Kabushiki Kaisha (JP)
Primary Class(es): 360/114.08 148/108, 148/301, 420/416, 428/678, 428/928
Other Classes:
US Patent Ref:
3102002Aug, 1963Wallace et al.75/152.
3124490Mar, 1964Schmekenbecher148/108.
3472708Oct, 1969Schindler et al.148/108.
3475738Oct, 1969Louis et al.360/114.
3615911Oct, 1971Nesbitt et al.148/101.
3626394Dec, 1971Nelson et al.360/114.
3636535Jan, 1972Cushner et al.360/114.
3665431May, 1972Alstad et al.360/114.
3676867Jul, 1972Bacon et al.360/114.
3739362Jun, 1973Eschelbach360/114.
3816237Jun, 1974Barrall et al.360/114.
3856513Dec, 1974Chen et al.75/122.
3949351Apr, 1976Clark et al.75/152.

Other Refs:
Primary Examiner: Eddleman, Alfred H.
Assistant Examiner:
Attorney: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.