Sony Corporation

Yuichi Arisaka

Kenichi Sato

Kazunobu Chiba

Yukari Yamada

Kenji Ueda

Junichi Tachibana

Takuya Ito

Hiroshi Mizuno

Toshiharu Kobayashi

Shinichi Matsumura

Hirofumi Kondo

Satoshi Sato

Yoh Iwasaki

Mayumi Abe

A transfer sheet includes a supporting substrate, a photothermal conversion layer disposed on the supporting substrate, and a passive layer disposed on the photothermal conversion layer.

Method for forming transfer sheet

Transfer sheet and method for forming the same

Provided is a magnetic recording medium capable of achieving higher density recording. The magnetic recording medium comprises a magnetic layer formed on a non-magnetic base through vacuum oblique evaporation. The magnetic layer includes a plurality of columns in which 3 to 7 ferromagnetic particles with an average diameter of 5 to 10 nm are arranged in a line, and non-magnetic particles are disposed between columns so as to separate the columns from one another. A value Y/X defined as a ratio of an average value Y of a distance between the centers of adjacent columns in a film in-plane direction to an average value X of a distance between the centers of adjacent columns in a film thickness direction is preferably 0.5 or more.

Magnetic recording medium with columar magnetic layer

A method of producing a magnetic recording medium comprising the step of forming a magnetic layer on a non-magnetic base film running at a constant speed by continuous oblique evaporation depositing metal vapor of volatilized metal incident obliquely to a surface of the non-magnetic base film, wherein the evaporation is conducted at a film forming rate, defined as an average deposition rate of the magnetic layer at a part of the non-magnetic base film exposed to the incident metal vapor, of not less than a predetermined rate to form an internal microstructure of the magnetic layer comprising columns each having a diameter of not more than about 15 nm constituted by magnetic particles having a size of not more than about 10 nm connected in chains in a direction substantially perpendicular to the magnetic layer and non-magnetic particles packed between the columns and separating the columns from each other, and a magnetic recording medium produced by the above method.

Method of producing magnetic recording medium

Magnetic recording medium

A magnetic recording medium, comprising a nonmagnetic substrate on the surface of which is deposited a magnetic layer. In one embodiment, the magnetic layer is formed of two thin films of magnetic metal and a layer of nonmagnetic material sandwiched therebetween, the layer of nonmagnetic material having a thickness no greater than 20% of the thickness of the magnetic layer, with the magnetic layer having an energy product of at least 100 gauss.multidot.cm.multidot.Oe as the product of its residual magnetic flux density, thickness and coercive force, and a surface roughness no greater than 0.003 .mu.m in center line average height. In another embodiment, the magnetic layer, which may be a single layer of magnetic metal film or may be of the aforementioned multiple layer construction, is vacuum deposited onto the substrate at an incident angle in the range of 30.degree. to 70.degree..

A method for magnetically recording digital video signals includes the steps of: converting input digital video signals into data segmented into blocks each composed of a plurality of pixel data; compression-coding the blocks of pixel data block-by-block; converting the compression-coded data into channel-encoded data; and supplying the channel-encoded data to magnetic heads on a rotary drum for recording by such heads on a magnetic recording medium constituted by a nonmagnetic base having thereon a magnetic layer of at least one thin magnetic metal film which has an energy product of at least 75 G.cm.Oe, with the surface roughness of said magnetic recording medium being at most 0.003 .mu.m in center line average height Ra, and with the surface roughness of said magnetic recording medium being at most 0.04 .mu.m in ten point average height Rz.

Digital signal recording on a magnetic recording medium having a

A magnetic recording medium comprised of a nonmagnetic support; a magnetic metal thin film formed on one major surface of the nonmagnetic support; and a protective film of a corrosion-resistant metal or a multilayer protective film structure consisting of a corrosion-resistant metal film and a durable protective film of a hard material. A multilayer protective film structure is formed by sputtering a corrosion-resistant protective film and a durable protective film over the magnetic metal thin film while the nonmagnetic support travels along the circumference of a cooling cylinder by using at least one target of a corrosion-resistant metal and at least one target of a hard material, or by using a composite target composed of at least one corrosion-resistant metal and one hard material. The protective film suppresses the corrosion of the magnetic metal thin film and improves the corrosion resistance and durability of the magnetic recording medium.

Magnetic recording medium and a method of fabricating the same

Magnetic recording medium and method for production thereof

A magnetic tape for the recording of digital video signals is constituted by a nonmagnetic base having thereon a magnetic layer of at least one thin magnetic metal film which has an energy product of at least 100 G.cm.Oe, and with the surface roughness of the magnetic tape being at most 0.003 .mu.m in center line average height. Such tape, when used with magnetic heads each having a gap defined between portions of the respective head having a saturation magnetic flux density of at least 14 kG., contribute to the maintenance of an acceptable raw error bit rate below 1.times.10.sup.-4 when recording with a recorded bit area of no more than 1.25 .mu.m.sup.2 /bit.

Method and apparatus for magnetic recording digital video signals and

Digital video recording apparatus for recording digital video signals of

Recording of digital video signals on a magnetic medium having a

A magnetic recording transfer method for use with the combination of a mother magnetic recording medium and a copy magnetic recording medium of a metal-deposited thin film type each. The two media are overlaid so that the column inclination of one medium will be opposite in direction to that of the other medium. This method comprises the step of externally applying a biased magnetic field to the combination of the media in such a manner that magnetized recordings on the mother medium will be transferred to the copy medium. The easy axis of the mother medium is positioned at an angle of 20.degree..+-.15.degree. with respect to the in-plane direction of the medium. The biased magnetic field is applied to the mother medium at an angle of 110.degree..+-.15.degree. with respect to the in-plane direction of the medium. This makes it possible to enhance the efficiency in transferring magnetic recording of the mother medium, especially the recordings of short wave lengths, and to minimize demagnetization of the mother medium. Furthermore, the ratio of the coercive force H.sub.CM of the mother medium to the coercive force H.sub.CC of the copy medium (H.sub. CM /H.sub.CC) is set to at most 1.5. This improves the magnetic recording transfer output of the copy medium and boosts the efficiency in the magnetic transfer of short wave magnetic recordings.

Growing community of inventors

Miyagi, Japan

Yuichi Arisaka