FujiFilm Assigned Fourteen Patents

Magnetic tape device with TMR head and specific logarithmic decrement
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,403,320) developed by Kasada, Norihito, Ozawa, Eiki, and Kaneko, Tetsuya, Minami-ashigara, Japan, for “magnetic tape device with TMR head and specific logarithmic decrement and magnetic reproducing method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape device includes: a magnetic tape, and a reproducing head, in which the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.”

The patent application was filed on December 20, 2017 (15/848,173).

Magnetic tape having characterized magnetic layer
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,403,319) developed by Kasada, Norihito, Kanagawa, Japan, for “magnetic tape having characterized magnetic layer, tape cartridge, and recording and reproducing device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape includes a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer containing ferromagnetic powder, abrasive, and binder on the nonmagnetic layer, wherein a thickness of the nonmagnetic layer is less than or equal to 0.50 .mu.m, a coefficient of friction as measured on a base portion of a surface of the magnetic layer is less than or equal to 0.35, and .DELTA.SFD in a longitudinal direction of the magnetic tape as calculated with Equation 1, .DELTA.SFD=SFD.sub.25.degree. C.-SFD.sub.-190.degree. C., is greater than or equal to 0.50, wherein, in Equation 1, SFD.sub.25.degree. C. denotes a SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of 25.degree. C., and SFD.sub.-190.degree. C. denotes a SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of -190.degree. C.”

The patent application was filed on December 15, 2016 (15/380,309).

Magnetic tape having characterized back coating layer
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,403,318) developed by Kurokawa, Takuto, Ozawa, Eiki, and Kasada, Norihito, Minami-ashigara, Japan, for a “magnetic tape having characterized back coating layer.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape in which a thickness of a back coating layer is equal to or smaller than 0.20 .mu.m. A C–H derived C concentration calculated from a C–H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the back coating layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 35 atom %. The full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the back coating layer before and after performing a vacuum heating with respect to the magnetic tape are respectively greater than 0 nm and equal to or smaller than 10.0 nm. The difference between the spacing measured after performing the vacuum heating and a spacing measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.”

The patent application was filed on June 16, 2017 (15/625,428).

Magnetic tape device and magnetic reproducing
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,403,317) developed by Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape device and magnetic reproducing method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape device includes a magnetic tape and a TMR head, in which the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity Int(110) of a diffraction peak of a, (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a, (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.”

The patent application was filed on March 14, 2018 (15/920,538).

Magnetic tape having characterized magnetic layer with servo pattern
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,403,316) developed by Kasada, Norihito, Minami-ashigara, Japan, for “magnetic tape having characterized magnetic layer with servo pattern and magnetic tape device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape includes a magnetic layer including ferromagnetic powder and a binding agent, in which a magnetic tape total thickness is equal to or smaller than 5.30 .mu.m, the magnetic layer has a servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity of a diffraction peak of a, (110) plane with respect to a peak intensity of a diffraction peak of a, (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape.”

The patent application was filed on July 18, 2018 (16/038,339).

Magnetic tape device employing TMR head
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,403,314) developed by Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape device employing TMR head and magnetic tape with characterized magnetic layer, and head tracking servo method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape device includes a TMR head as a servo head, and a magnetic tape which includes a magnetic layer including ferromagnetic hexagonal ferrite powder and a binding agent, and including a servo pattern. The XRD intensity ratio, Int(110)/Int(114)) of the hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer using an In-Plane method is 0.5 to 4.0. The vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 2.0 nm, and the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050.”

The patent application was filed on February 20, 2018 (15/899,430).

Magnetic tape device and magnetic reproducing
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,403,312) developed by Ozawa, Eiki, and Kasada, Norihito, Minami-ashigara, Japan, for “magnetic tape device and magnetic reproducing method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape device includes a TMR head and a magnetic tape, in which the magnetic tape includes fatty acid ester in a magnetic layer, Ra measured regarding a surface of the magnetic layer is 2.0 nm or smaller, full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and 7.0 nm or smaller, a difference between spacings before and after the vacuum heating is greater than 0 nm and 8.0 nm or smaller, and a ratio of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster thereof in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.”

The patent application was filed on March 14, 2018 (15/920,592).

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,395,685) developed by Ozawa, Eiki, and Kasada, Norihito, Minami-ashigara, Japan, for “magnetic tape device and head tracking servo method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape device includes a TMR head, servo head, and a magnetic tape including a magnetic layer including ferromagnetic hexagonal ferrite powder, a binding agent, and fatty acid ester, in which an XRD intensity ratio obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio is 0.65 to 1.00, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 7.0 nm, and a difference between spacings before and after the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.”

The patent application was filed on March 14, 2018 (15/920,517).

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,373,639) developed by Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape device and head tracking servo method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape device includes a magnetic tape including a magnetic layer, in which an intensity ratio of a peak intensity of a diffraction peak of a, (110) plane with respect to a peak intensity of a diffraction peak of a, (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and a C–H derived C concentration calculated from a C–H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.”

The patent application was filed on March 14, 2018 (15/920,768).

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,373,633) developed by Kaneko, Tetsuya, Kasada, Norihito, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape device and head tracking servo method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape device includes: a magnetic tape, and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.”

The patent application was filed on December 26, 2017 (15/854,438).

Head positioning of timing-based servo system for magnetic tape recording
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,366,721) developed by Kasada, Norihito, Minami-ashigara, Japan, for a “head positioning of timing-based servo system for magnetic tape recording 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 including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm.sup.3, an XRD intensity ratio Int(110)/Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and an edge shape of the timing-based servo pattern specified by magnetic force microscope observation is a shape in which a difference, (L.sub.99.9-L.sub.0.1) is equal to or smaller than 180 nm, and a magnetic tape device including the magnetic tape.”

The patent application was filed on June 15, 2018 (16/009,603).

Magnetic tape device and head tracking servo
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,360,937) developed by Ozawa, Eiki, and Kasada, Norihito, Minami-ashigara, Japan, for “magnetic tape device and head tracking servo method.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”The magnetic tape device includes a TMR head, servo head, and a magnetic tape, in which a magnetic layer of the magnetic tape includes fatty acid ester, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 7.0 nm, a difference between spacings before and after the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm, and .DELTA.SFD, (=SFD.sub.25.degree. C.-SFD.sub.-190.degree. C.) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50.”

The patent application was filed on March 14, 2018 (15/920,563).

Magnetic tape having characterized magnetic layer
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,347,280) developed by Kasada, Norihito, Kaneko, Tetsuya, and Ozawa, Eiki, Minami-ashigara, Japan, for “magnetic tape having characterized magnetic layer and magnetic tape device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape includes a non-magnetic layer containing non-magnetic powder and a binder on a non-magnetic support, and a magnetic layer containing ferromagnetic powder and a binder on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is equal to or less than 0.60 .mu.m. The magnetic layer includes a timing-based servo pattern. One or more components selected from a fatty acid and a fatty acid amide are included in at least the magnetic layer. The C–H derived C concentration calculated from the C–H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %.”

The patent application was filed on June 19, 2017 (15/626,720).

Magnetic tape having characterized backcoat layer
FujiFilm Corporation, Tokyo, Japan, has been assigned a patent (10,347,279) developed by Ozawa, Eiki, Oyanagi, Masahito, and Kasada, Norihito, Minami-ashigara, Japan, for “magnetic tape having characterized backcoat layer and method of manufacturing the same.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic tape has a magnetic layer and a backcoat layer. Each of the magnetic layer and the backcoat layer contains a fatty acid ester. The Ra measured on the magnetic layer side surface is less than or equal to 2.8 nm. The difference between the spacing measured by optical interferometry on the magnetic layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm. The FWHM.sub.before on the backcoat layer side surface is greater than 0 nm but less than or equal to 10.0 nm. The FWHM.sub.after on the backcoat layer side surface is greater than 0 nm but less than or equal to 10.0 nm. The difference between the spacing measured on the backcoat layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm.”

The patent application was filed on February 2, 2017 (15/422,944).