Fuji Photo Film Company, Limited

Fujifilm Corporation

Minoru Sueki

Masatoshi Takahashi

Kiyomi Ejiri

Yutaka Kakuishi

Toru Nakao

Toshiyuki Kitahara

Takahisa Izumida

Kiyoo Morita

Satoru Hayakawa

Akira Kasuga

Toshio Kawamata

Ren Ishikawa

Ryota Suzuki

Tsutomu Sugisaki

Tadashi Ishiguro

Tetsuji Nishida

A recording tape cartridge houses a reel including a hub around which recording tape is wound and at least part of which is formed by a resin. The rigidity (modulus of elasticity) y in the radial direction of the hub and the creep deformation ratio x of the recording tape satisfy the conditions of y&#x2267;87.3 expand x&#x3e;0.1. By setting the rigidity of the reel hub to match the creep deformation ratio of the recording tape so as to satisfy this relationship, creep deformation of the recording tape can be controlled at the smallest cost.

Recording tape cartridge

A method for inspecting a head unit moving device is characterized by having the steps of running a inspection use tape in which a servo signal is written displaced in a width direction of a magnetic tape at a predetermined frequency and amplitude; measuring a position of a head unit practically moved in a width direction of the inspection use tape in response to the servo signal; and calculating a difference between the position and a position to be instructed so as to move the head unit in response to the servo signal, wherein the head unit moving device moves the head unit with a servo signal reading head, a data signal recording head, and a data signal reproducing head in the width direction of the magnetic tape in response to the servo signal read from the magnetic tape by the servo signal reading head.

Inspection method of head unit moving device and manufacture method of inspection use tape therefor

Disclosed is a servo writer which forms servo bands on information recording media so as to enable a drive to track the servo bands with great accuracy by using a recording/reproducing head. The servo writer includes a driving mechanism for running a tape-shaped information recording medium, a servo pattern writing means for writing servo patterns on the running tape-shaped information recording medium, thereby forming servo bands thereon, and a tape edge forming mechanism for cutting evenly an edge of the running tape-shaped information recording medium, so that the edge becomes parallel to the servo bands.

Servo writer

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

A magnetic recording medium comprising: a support; and at least one magnetic layer containing a ferromagnetic powder and a binder, wherein a center line average roughness of the magnetic layer measured with a laser interferometer is from 1 to 3 nm, a skewness is 0 or more and less than 1.0, and a maximum difference of elevation of peak/valley is 50 nm or less.

Magnetic recording medium

A cleaning medium for a magnetic recording apparatus is disclosed, comprising a nonmagnetic support having provided thereon a lower coating layer mainly containing a nonmagnetic inorganic powder and a binder, and a cleaning layer containing at least a ferromagnetic inorganic powder and a binder provided on the lower coating layer, wherein the thickness of the cleaning layer is from 0.05 to 1.0 &#x3bc;m, the thickness of the lower coating layer is from 0.2 to 5.0 &#x3bc;m, the thickness of the support is from 2.0 to 10 &#x3bc;m, and the thickness in total of the cleaning medium (cleaning tape) is from 4.0 to 15 &#x3bc;m.

Cleaning medium for magnetic recording apparatus

A magnetic tape favorably employable for recording computer data, comprising a support web, a magnetic layer and a back-coat layer and having a thickness of 3 to 10 &#x3bc;m, should have a curl having a radius of curvature of greater than 10 mm in its longitudinal direction and a curl having a radius of curvature of greater than 40 mm in its width direction, wherein the curl in the width direction gives a convex surface on the side of the magnetic layer.

Magnetic tape possessing a controlled radius of curvature in the width and longitudinal directions

A magnetic tape includes: a back coating layer containing a carbon black; a support; a non-magnetic layer containing a non-magnetic powder and a binder, which is substantially non-magnetic; and a magnetic layer containing a ferromagnetic powder and a binder, in this order, wherein the magnetic tape is a magnetic tape for recording a signal with a 10 to 100 Mbit/cm surface recording density; the magnetic tape has a temperature expansion coefficient in a width direction thereof of a 0.0015%/&deg; C. or less, a humidity expansion coefficient of 0.0015%/% RH or less, an offset yield strength in a longitudinal direction thereof of 10N or more, a rupture strength of 30 N or more; and the support has a center plane average roughness on a coating surface side of the magnetic layer of 1.0 nm or less, a center plane average roughness on a coating surface side of the back coating layer of 3.0 to 9.0 nm, and projections having a 273 nm or more height existing on the coating surface side of the magnetic layer of 10 pieces/100 cm or less.

Magnetic tape having specific surface recording density and comprising a support having specific surface roughness

Magnetic tape recording medium, magnetic tape recording and reproducing apparatus, magnetic tape recording method and magnetic tape cassette

A magnetic recording medium having on a support at least two magnetic layers that include an uppermost magnetic layer for recording information and a lower magnetic layer for recording servo signals, wherein the uppermost magnetic layer has a coercive force Hc(U) &lsqb;KA/m&rsqb; at most 265 times as much as a saturated magnetic flux density Bs&lsqb;T&rsqb; of a recording head used for information recording and the lower magnetic layer has a coercive force Hc(L) &lsqb;KA/m&rsqb; at least 159 times as much as the saturated magnetic flux density Bs&lsqb;T&rsqb; of the recording head used for information recording, thereby ensuring highly accurate servo write and elevation of recording density.

Magnetic recording medium comprising magnetic layers, the coercive force thereof specifically related to saturation magnetic flux density

A magnetic recording medium comprising two or more magnetic layers provided on a support, wherein an easily magnetizable axis of an uppermost magnetic layer and an easily magnetizable axis of a lower magnetic layer are oriented in directions crossing each other at right angles, which can attain both a highly precise servo write and a higher recording density.

Magnetic recording medium and signal recording system comprising at least two magnetic layers with orthogonally oriented axes

Provided is a magnetic recording medium suited to magnetic recording and reproduction systems employing linear methods and incorporating magnetoresistive reproduction heads. The magnetic recording medium comprising a magnetic layer for servo signal recording, a nonmagnetic layer, and a magnetic layer for information recording in this order on a nonmagnetic support, wherein said magnetic layer for information recording exhibits a coercivity of at least 7.96 kA/m (100 Oe) higher than a coercivity of said magnetic layer for servo signal recording and an interface roughness at the interface of said magnetic layer for servo signal recording and said nonmagnetic layer ranges from 7 to 12 nm.

A magnetic tape favorably employable for recording computer data has a support, and on one side of the support, a essentially non-magnetic layer composed of a non-magnetic powder and a binder, and a magnetic layer composed of a ferromagnetic powder and a binder superposed in order, and on the other side, a back-coating layer containing carbon black, wherein the magnetic layer has a thickness of 0.08 to 0.28 &mgr;m and a magnetic flux of 0.02 to 0.1 G&middot;cm.

Magnetic tape

A magnetic recording tape favorably employable for recording computer data is composed of a support, and on one side of the support, a non-magnetic layer composed of a non-magnetic powder and a binder, and a magnetic recording layer composed of a ferromagnetic powder and a binder superposed in order, and on the other side, a back-coating layer containing carbon black, in which the magnetic recording tape has a lateral thermal expansion coefficient of not more than 0.0015%/&deg; C., a lateral humidity expansion coefficient of not more than 0.0015%/% RH, a longitudinal offset proof stress of not less than 10 N, and a longitudinal breaking strength of not less than 30 N.

Growing community of inventors

Kanagawa, Japan

Minoru Sueki