Fuji Photo Film Company, Limited

Tetsuji Nishida

Satoshi Matsubaguchi

Shinji Saito

Katsumi Ryoke

Naoyoshi Chino

Katsuhiko Meguro

Mikihiko Kato

Toshiyuki Kitahara

Hiroaki Doushita

Yutaka Kakuishi

Minoru Sueki

Minoru Kanazawa

Makoto Yoshimura

Takeshi Nagata

Disclosed is a magnetic tape which contributes to a high recording density, and which achieves an enhanced flexibility in a width of a data track and a data format. The magnetic tape includes servo tracks being recorded thereon. These servo tracks contain respective servo signals, and are arranged lengthwise and adjacent to one another over a whole of a width or a part of the magnetic tape. Further, each of the servo tracks includes address signals being recorded thereon at predetermined intervals in isolation from the corresponding servo signals. These address signals indicate their respective locations of corresponding one of the servo tracks and their respective lengthwise locations on the magnetic tape. In addition, the servo signals are read from the respective servo bands, and are used to adjust tracking of a magnetic head on the magnetic tape.

Magnetic tape, magnetic tape cartridge, magnetic tape drive, and method for recording data on magnetic tape

Provision of a highly reliable magnetic recording medium with able to record further high density recording, usable advantageously as a magnetic tape for recording computer data, and having a further improved SNR, and a method for reproducing signals magnetically recorded on a magnetic recording medium to reproduce more desirably magnetic recording such as computer data with high density recording or the like. The magnetic recording medium having, on either side of a flexible nonmagnetic support, a nonmagnetic layer containing a nonmagnetic powder and a binder, and a magnetic layer containing a ferromagnetic powder and a binder, having a thickness in the range of from 0.2 to 0.6 &mgr;m in this order, where a laminated head is used for reproduction. The method for reproducing signals magnetically recorded medium having, on either side of a flexible nonmagnetic support, a nonmagnetic layer containing a nonmagnetic powder and a binder, and a magnetic layer, with a thickness ranging from 0.2 to 0.6 &mgr;m, containing a ferromagnetic powder and a binder in this order, where a laminated head is used as a reproducing head.

Magnetic recording medium and method for reproducing magnetic recording

Provided is a magnetic recording medium having good electromagnetic characteristics, particularly both improved high-density recording characteristics and good durability, and particularly a C/N ratio that is markedly improved in the high-density recording region. A magnetic recording medium comprising a nonmagnetic lower layer and a magnetic layer provided in this order on a support wherein said magnetic layer comprises a ferromagnetic metal powder or a ferromagnetic hexagonal ferrite powder and a binder and has a coercive force equal to or higher than 143 kA/m. Said magnetic recording medium is a medium for recording signals having a surface recording density ranging from 0.2 to 2 Gbit/inch ; said support has a thickness equal to or less than 5.5 &mgr;m and a Young's modulus in the MD direction equal to or higher than 11,000 Mpa; and said support has on the reverse surface from said magnetic layer a backcoat layer, said backcoat layer having not fewer than 200 and not more than 1,000 protrusions having a height equal to or higher than 50 nm per 10,000 &mgr;m .

Magnetic recording medium comprising a backcoat layer having specific protrusions

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 comprising a non-magnetic support having thereon a magnetic layer comprising a ferromagnetic powder and a binder resin is disclosed. The magnetic layer contains a first carbon black having a DBP absorption of from 40 to 120 ml/100 g and a second carbon black having a DBP absorption of from 140 to 200 ml/100 g. Both carbon black have an average particle size of from 5 to 35 m.mu.. The medium maintains a high output level and has excellent running stability. Therefore, the dropout due to abrasion caused by an increase in friction coefficient and output reduction due to head clogging, can be avoided.

Magnetic recording medium having a magnetic layer containing two carbon

A magnetic recording medium for a video tape recorder is disclosed, comprising a nonmagnetic support having thereon in the following order an under magnetic layer containing ferromagnetic particles of metal oxide and an upper magnetic layer containing ferromagnetic particles of metal oxide, wherein said under magnetic layer contains the ferromagnetic particles having a specific surface area by a BET method of from 26 to 50 m.sup.2 /g and a coercive force (Hc.sub.1) of from 500 to 1,000 Oe; said upper magnetic layer contains the ferromagnetic particles having a specific surface area by a BET method of from 30 to 60 m.sup.2 /g and a coercive force (Hc.sub.2) of from 600 to 1,200 Oe; the dry thickness of the upper magnetic layer is from 0.1 to 1.0 .mu.m; and the coercive force (Hc.sub.2) of the ferromagnetic particles for the upper magnetic layer is higher than the coercive force (Hc.sub.1) of the ferromagnetic particles for the under magnetic layer.

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Kanagawa, Japan

Tetsuji Nishida