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FujiFilm Assigned Nineteen Patents

On magnetic tape technologies and solutions

Servo pattern recording device, magnetic tape, cartridge, drive, system, detection device, servo pattern recording method, and manufacturing method of magnetic tape
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11908498) developed by Nakao, Toru, Kaneko, Tetsuya, and Akano, Yoichi, Kanagawa, Japan, for servo pattern recording device, magnetic tape, magnetic tape cartridge, magnetic tape drive, magnetic tape system, detection device, servo pattern recording method, and manufacturing method of magnetic tape.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A first straight line region and a second straight line region of the straight line region pair are inclined in opposite directions with respect to a first imaginary straight line. The first straight line region has a steeper inclined angle with respect to the first imaginary straight line than the second straight line region. Positions of both ends of the first straight line region and positions of both ends of the second straight line region are aligned in a direction corresponding to a width direction of a magnetic tape. A plurality of gap patterns deviate from each other by a predetermined interval in a direction corresponding to a longitudinal direction of the magnetic tape, between the gap patterns adjacent to each other along the direction corresponding to the width direction of the magnetic tape. A substrate is inclined with respect to the first imaginary straight line.

The patent application was filed on 2022-09-22 (17/950142).

Detection device, inspection device, magnetic tape drive, system, detection method, inspection method, and program
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11900969) developed by Nakao, Toru, Kaneko, Tetsuya, and Akano, Yoichi, Kanagawa, Japan, for detection device, inspection device, magnetic tape drive, magnetic tape system, detection method, inspection method, and program.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A detection device includes a processing device and a storage medium. An ideal waveform signal indicating an ideal waveform of a servo pattern signal which is a result of reading a servo pattern recorded in a servo band of a magnetic tape by a servo reading element is stored in advance in the storage medium. The processing device acquires a servo band signal which is a result of reading the servo band by the servo reading element, and detects the servo pattern signal by comparing the servo band signal with the ideal waveform signal.

The patent application was filed on 2022-10-27 (18/050231).

Magnetic tape having characterized magnetic layer surface, cartridge, and magnetic tape device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11900977) developed by Kasada, Norihito, Minamiashigara, Japan, for magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape in which an arithmetic average roughness Ra measured at a surface of a magnetic layer with an atomic force microscope is 2.0 nm or less, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F.sub.45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.

The patent application was filed on 2022-09-28 (17/955113).

Detection device, inspection device, magnetic tape cartridge, tape, drive, system, detection method, inspection method, and program
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11900976) developed by Akano, Yoichi, Nakao, Toru, and Kaneko, Tetsuya, Kanagawa, Japan, for detection device, inspection device, magnetic tape cartridge, magnetic tape, magnetic tape drive, magnetic tape system, detection method, inspection method, and program.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A processing device stores a result of reading a reference servo pattern by a servo reading element from a magnetic tape in which the reference servo pattern is recorded, in the storage medium as an ideal waveform signal indicating an ideal waveform, acquires a servo band signal which is a result of reading a servo pattern recorded in a servo band of the magnetic tape by the servo reading element, and detects a servo pattern signal which is a result of reading the servo pattern by the servo reading element by comparing the ideal waveform signal stored in the storage medium with the servo band signal. The magnetic tape has a data band. The reference servo pattern is recorded in the data band.

The patent application was filed on 2022-12-22 (18/145558).

Magnetic recording medium having characterized vertical SFD, magnetic tape cartridge, and magnetic recording reproducing device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11894032) developed by Ozawa, Eiki, and Fujimoto, Takashi, Minamiashigara, Japan, for magnetic recording medium having characterized vertical SFD, magnetic tape cartridge, and magnetic recording reproducing device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “Provided are: a magnetic recording medium including a non-magnetic support and a magnetic layer containing a ferromagnetic powder, in which the ferromagnetic powder is an ε-iron oxide powder, a vertical switching field distribution SFD of the magnetic recording medium is 0.20 or more and 3.00 or less at a measurement temperature of 25° C., and an inclination of SFD obtained from SFD at a measurement temperature of 10° C., SFD at a measurement temperature of 25° C., and SFD at a measurement temperature of 40° C. is 0.003° C..sup.−1 or more and 0.080° C..sup.−1 or less, a magnetic tape cartridge including the magnetic recording medium which is a magnetic tape, and a magnetic recording and reproducing device including the magnetic recording medium.

The patent application was filed on 2023-03-29 (18/191983).

Servo pattern recording device, magnetic tape, cartridge, drive, system, detection device, servo pattern recording method, and manufacturing method of magnetic tape
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11894027) developed by Nakao, Toru, Kaneko, Tetsuya, and Akano, Yoichi, Kanagawa, Japan, for servo pattern recording device, magnetic tape, magnetic tape cartridge, magnetic tape drive, magnetic tape system, detection device, servo pattern recording method, and manufacturing method of magnetic tape.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A plurality of gap patterns are formed on a front surface of a substrate along a direction corresponding to a width direction of a magnetic tape. The first straight line region has a steeper inclined angle with respect to the first imaginary straight line than the second straight line region. Positions of both ends of the first straight line region and positions of both ends of the second straight line region are aligned in a direction corresponding to a width direction of a magnetic tape. Positions of the plurality of gap patterns are aligned in a longitudinal direction of the magnetic tape. A pulse signal is supplied to each of the plurality of gap patterns with a delay of a predetermined time from one side to the other side in a direction in which the plurality of gap patterns are arranged.

The patent application was filed on 2022-09-22 (17/950143).

Magnetic tape having characterized magnetic layer surface, cartridge, and magnetic tape device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11894033) developed by Kasada, Norihito, Minamiashigara, Japan, for magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape in which a vertical switching field distribution SFD of the magnetic tape is 1.5 or less, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F.sub.45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.

The patent application was filed on 2022-09-28 (17/954800).

Magnetic tape having characterized magnetic layer surface, cartridge, and magnetic tape device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11894034) developed by Kasada, Norihito, Minamiashigara, Japan, for magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape in which an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 μm or less, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F.sub.45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.

The patent application was filed on 2022-09-28 (17/954808).

Magnetic tape having characterized magnetic layer surface, cartridge, and magnetic tape device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11887637) developed by Kasada, Norihito, Minamiashigara, Japan, for magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape in which a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopy performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 atom % to 65 atom %, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.

The patent application was filed on 2022-09-28 (17/955251).

Magnetic tape having characterized magnetic layer surface, cartridge, and magnetic tape apparatus
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11887636) developed by Kasada, Norihito, Murata, Yuto, and Yamasaki, Nagisa, Minamiashigara, Japan, for magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape apparatus.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “The magnetic tape includes: a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. In a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 5 kV, the number of bright regions having an equivalent circle diameter of 60 nm or more and less than 120 nm is 8000 or more and 30000 or less. Standard deviation σ of the number of the bright regions in a width direction of the surface of the magnetic layer is 2000 or less.

The patent application was filed on 2023-04-11 (18/298730).

Magnetic tape having controlled water contact angle ratio, cartridge, and magnetic tape apparatus
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11869559) developed by Oyanagi, Noriko, Kikuchi, Wataru, and Tamura, Akio, Minamiashigara, Japan, for magnetic tape having controlled water contact angle ratio, magnetic tape cartridge, and magnetic tape apparatus.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A fluorine-containing compound is included in a portion on the non-magnetic support on a magnetic layer side, and a ratio θr of a water contact angle measured on a surface of the magnetic layer after sliding on a magnetic head to a water contact angle measured on the surface of the magnetic layer before sliding on the magnetic head is 0.70 or more.

The patent application was filed on 2022-07-26 (17/873728).

Magnetic tape management device, cartridge, magnetic tape, system, magnetic tape management method, and program
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11869545) developed by Imai, Takashi, and Katayama, Kazutoshi, Minami-ashigara, Japan, for magnetic tape management device, magnetic tape cartridge, magnetic tape, magnetic tape system, magnetic tape management method, and program.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape management device includes a processor. The processor acquires a temperature and humidity of an environment in which a magnetic tape is stored, derives a specific enthalpy using the temperature and the humidity, and performs management processing on the magnetic tape in accordance with the specific enthalpy.

The patent application was filed on 2023-02-08 (18/166156).

Magnetic tape having characterized magnetic layer surface, cartridge, and device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11869553) developed by Kasada, Norihito, Minamiashigara, Japan, for magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape in which an arithmetic average roughness Ra measured at a surface of the magnetic layer with an atomic force microscope is 2.0 nm or less, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value.sub.45° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.

The patent application was filed on 2022-09-28 (17/955156).

Magnetic tape having characterized magnetic layer surface, cartridge, and device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11869555) developed by Kasada, Norihito, Minamiashigara, Japan, for magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape in which a vertical switching field distribution SFD of the magnetic tape is 1.5 or less, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value.sub.45° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.

The patent application was filed on 2022-09-28 (17/955044).

Magnetic tape having characterized magnetic layer surface, cartridge, and device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11869558) developed by Kasada, Norihito, Minamiashigara, Japan, for magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape in which a tape thickness of the magnetic tape is 5.2 μm or less, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value.sub.45° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.

The patent application was filed on 2022-09-28 (17/955035).

Magnetic tape having characterized magnetic layer surface, cartridge, and device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11869557) developed by Kasada, Norihito, Minamiashigara, Japan, for magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape in which an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 μm or less, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value.sub.45° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.

The patent application was filed on 2022-09-28 (17/955045).

Magnetic tape, cartridge, and device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11869552) developed by Kasada, Norihito, Minamiashigara, Japan, for magnetic tape, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape in which a tape thickness of the magnetic tape is 5.2 μm or less, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F.sub.45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.

The patent application was filed on 2022-09-27 (17/953953).

Magnetic tape,cartridge, and device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11862214) developed by Shibata, Yujin, Kasada, Norihito, Kurokawa, Takuto, and Matsuyama, So, Minamiashigara, Japan, for magnetic tape, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, in which an edge portion Ra which is an arithmetic average roughness Ra measured at an edge portion of a surface of the magnetic layer is 1.50 nm or less, a central portion Ra which is an arithmetic average roughness Ra measured at a central portion of the surface of the magnetic layer is 0.30 nm to 1.30 nm, and a Ra ratio (central portion Ra/edge portion Ra) is 0.75 to 0.95.

The patent application was filed on 2022-09-26 (17/953149).

Magnetic tape having characterized magnetic layer surface, cartridge, and device
Fuji
Film Corp., Tokyo, Japan, has been assigned a patent (11854586) developed by Kasada, Norihito, Minamiashigara, Japan, for magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device.

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic tape in which a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by XPS performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 atom % to 65 atom %, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value.sub.45° of the surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of given tilt angles of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.

The patent application was filed on 2022-09-28 (17/954719).

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