Fuji Photo Film Company, Limited

Minoru Kanazawa

Takahito Miyoshi

Yasutoshi Okuzawa

Tsutomu Sugisaki

Takuzi Yamada

Masaaki Fujiyama

Shinji Saito

Hiroshi Ogawa

Naoyoshi Chino

Katsuhiko Meguro

Mikihiko Kato

Toshimitu Okutu

Chiaki Mizuno

Kenichi Masuyama

Masami Sato

Masahiro Utumi

Takamitsu Asai

Youichi Hayata

Makoto Yoshimura

Tetsuji Nishida

Nobuo Aoki

A magnetic tape comprising: a coating layer containing ferromagnetic powder and a binder; a support; and a back layer, in this order, which satisfies the following conditions (1) to (3): (1) on a cut plane of the tape, an apex of a biggest convexity of the support does not protrude from a line connecting an apex of a biggest convexity of the coating layer and an apex of a biggest convexity of the back layer; (2) a Young's modulus in a thickness direction of a surface of the magnetic layer is from 1,000 to 2,500 kg/mm(from 9.8 to 24.5 GPa); and (3) a Young's modulus in a thickness direction of a surface of the back layer is from 600 to 2,000 kg/mm(from 5.9 to 19.6 GPa).

Magnetic tape

A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer, said magnetic layer comprising ferromagnetic particles and a binder, wherein nonmagnetic support has a transverse-direction Young's modulus of at least 1,000 Kg/mm.sup.2, said magnetic layer has a glass transition temperature of 80.degree. to 100.degree. C., and said magnetic recording medium has a total thickness of less than 12 .mu.m, and further a magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer, said magnetic layer comprising ferromagnetic particles and a binder, wherein said magnetic recording medium is adapted for use with a magnetic head having a core width of at least 100 .mu.m at a speed of at least 20 m/sec based upon relative speed of said recording medium and said head, said nonmagnetic support has a transverse-direction Young's modulus of at least 1,000 Kg/mm.sup.2, said magnetic layer has a glass transition temperature of from 80.degree. to 100.degree. C., and said magnetic recording medium has a total thickness of less than 12 .mu.m.

Magnetic recording medium having a magnetic layer with a Tg of 80.degree. C

A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer on one surface of the nonmagnetic support and a backing layer on the other surface thereof and having a thickness of from 10 to 40 .mu.m, wherein the surface of an edge of the medium which is to be in contact with the inner surface of the flange of a reel of a magnetgic tape cassette, the flange being a base for aligning the edge of the medium when the medium is wound around the reel, is depressed in such a way that the cross sectional area of the depression portion (11) (FIG. 1), as defined by four lines involving an extension line (6) from the surface of the magnetic layer (4) at the edge, an extension line (7) from the surface of the backing layer (5) at the edge, a line (9) which is in tangential contact with the outermost face (8) of the cross section of the edge and which crosses the two extension lines (6) and (7) perpendicularly thereto and a peripheral line (10) of the face of the edge, is from 15 to 60 .mu.m, that the surface roughness (Ra) of the surface of the magnetic layer is 6.5 nm or more (with a cut-off value of 0.25 mm) and that the medium, as a whole, has a Young's modulus (M.sub.0.5) and 550 kg/mm.sup.2 or less. The medium has a high quality and may be wound-up to a tape cassette or the like to have a well aligned form therein in operation for FF(fast forward)/REW(rewind) mode in a VTR.

Magnetic recording medium having a specified edge profile

A magnetic tape cassette having a guide pole which is in sliding contact with the magnetic surface of the tape produced in such a manner as to improve the running characteristics of the tape while being capable of being manufactured at a low cost. A cylindrical stainless steel base member is subjected to a barreling treatment so as to secure fine particles of an inorganic material having a Moh's hardness of greater than 9 to the slide surface of the guide post. Moreover, the surface of the guide pole can be finished by a surface rolling to reduce the number of scratch-like grooves in the slide surface having a depth of more than 0.2 .mu.m and a width of less than 40 .mu.m to less than 11 per millimeter in the sliding direction of the tape.

Magnetic tape cassette having improved guide pole structure

A magnetic recording medium comprising a nonmagnetic support, a first magnetic recording layer and a second magnetic recording layer, superposed in order, wherein:

Magnetic recording medium and process for the preparation of the same

A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic particles and a binder, wherein said ferromagnetic particles have a tabular ratio (table diameter/table thickness) of 2 or more, a table diameter of from 0.01 to 10 .mu.m, and a lamination degree of the magnetic particles in the magnetic layer in a cross-section thereof of 2 or more.

Magnetic recording medium having laminated hexagonal ferrite platelets

A magnetic recording medium is disclosed. The medium comprises a non-magnetic support having provided on opposite surfaces a magnetic recording layer and a backing layer containing two types of carbon black and a binder and having a thickness of 2 .mu.m or less, one of said carbon black being fine carbon black having an average particle size of 30 to 100 m.mu. and the other of said carbon black being coarse carbon black having an average particle size of 150 to 500 m.mu., and the mixing weight ratio of said carbon black and the binder being 1:1.5 to 1:3.5.

Magnetic recording medium

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Kanagawa, Japan

Minoru Kanazawa