# US 10,311,909 B2 · Magnetic tape having characterized magnetic layer and magnetic tape device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,311,909 B2 - Document ID: US10311909B2 - Status: Granted - Kind: B2 - Application number: 15/626,720 - Filed: 2017-06-19 - Published: 2017-12-28 - Granted: 2019-06-04 - Earliest claimed: 2016-06-23 - Assignees: FUJIFIRM Corporation - Applicants: FUJIFILM Corporation - Inventors: Norihito Kasada; Tetsuya Kaneko; Eiki Ozawa - Web page: https://patentgrep.com/patent/US10311909B2 ## CPC - G11B 5/78: Tape carriers - G11B 5/584: for track following on tapes - G11B 5/70: on a base layer - G11B 5/71: characterised by the lubricant - G11B 5/7305 - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract 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 μm. 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 %. ## Claims ### Claim 1 A magnetic tape comprising: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer, wherein the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes a timing-based servo pattern, one or more components selected from the group consisting of fatty acid and fatty acid amide are at least included in the magnetic layer, 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 equal to or greater than 45 atom %. ### Claim 2 (depends on 1) The magnetic tape according to claim 1, wherein the C—H derived C concentration is 45 atom % to 80 atom %. ### Claim 3 (depends on 1) The magnetic tape according to claim 1, wherein the C—H derived C concentration is 50 atom % to 80 atom %. ### Claim 4 (depends on 1) The magnetic tape according to claim 1, wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer. ### Claim 5 (depends on 1) The magnetic tape according to claim 1, wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm. ### Claim 6 (depends on 2) The magnetic tape according claim 2, wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer. ### Claim 7 (depends on 2) The magnetic tape according to claim 2, wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm. ### Claim 8 (depends on 3) The magnetic tape according to claim 3, wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer. ### Claim 9 (depends on 3) The magnetic tape according to claim 3, wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm. ### Claim 10 A magnetic tape device comprising: a magnetic tape; a magnetic head; and a servo head, wherein the magnetic tape is a magnetic tape comprising: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer, wherein the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes a timing-based servo pattern, one or more components selected from the group consisting of fatty acid and fatty acid amide are at least included in the magnetic layer, 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 equal to or greater than 45 atom %. ### Claim 11 (depends on 10) The magnetic tape device according to claim 10, wherein the C—H derived C concentration is 45 atom % to 80 atom %. ### Claim 12 (depends on 10) The magnetic tape device according to claim 10, wherein the C—H derived C concentration is 50 atom % to 80 atom %. ### Claim 13 (depends on 10) The magnetic tape device according to claim 10, wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer of the magnetic tape. ### Claim 14 (depends on 10) The magnetic tape device according to claim 10, wherein the total thickness of the non-magnetic layer and the magnetic layer of the magnetic tape is 0.20 μm to 0.60 μm. ### Claim 15 (depends on 11) The magnetic tape device according to claim 11, wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer of the magnetic tape. ### Claim 16 (depends on 11) The magnetic tape device according to claim 11, wherein the total thickness of the non-magnetic layer and the magnetic layer of the magnetic tape is 0.20 μm to 0.60 μm. ### Claim 17 (depends on 12) The magnetic tape device according to claim 12, wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer. ### Claim 18 (depends on 12) The magnetic tape device according to claim 12, wherein the total thickness of the non-magnetic layer and the magnetic layer of the magnetic tape is 0.20 μm to 0.60 μm.