# US 12,112,770 B2 · Magnetic tape cartridge, magnetic tape drive, tension control method, method of handling magnetic tape, and program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,112,770 B2 - Document ID: US12112770B2 - Status: Granted - Kind: B2 - Application number: 18/349,964 - Filed: 2023-07-11 - Published: 2024-02-01 - Granted: 2024-10-08 - Earliest claimed: 2022-07-29 - Assignees: FUJIFILM Corporation - Applicants: Fujifilm Corporation - Inventors: Keisuke Koike; Ren Ishikawa - Web page: https://patentgrep.com/patent/US12112770B2 ## CPC - G11B 23/042: {Auxiliary features (sensing such features G11B15/06)} - G11B 15/43: Control or regulation of mechanical tension of record carrier, e.g. tape tension - 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 cartridge includes a magnetic tape wound around a reel, in which the magnetic tape has a first region, which is a predetermined region influenced by a width change of the magnetic tape accompanied by deformation of the reel due to winding of the magnetic tape, and a second region, which is a region on an outer peripheral side of the reel with respect to the first region, and regarding a degree of elongation in a longitudinal direction of the magnetic tape, the degree of the first region is equal to or larger than the degree of the second region. ## Claims ### Claim 1 A magnetic tape cartridge comprising: a magnetic tape wound around a reel, wherein the magnetic tape has a first region, which is a predetermined region influenced by a width change of the magnetic tape accompanied by deformation of the reel due to winding of the magnetic tape, and a second region, which is a region on an outer peripheral side of the reel with respect to the first region, and regarding a degree of elongation in a longitudinal direction of the magnetic tape, the degree of elongation of the first region is larger than the degree of elongation of the second region, wherein regarding a tension in the magnetic tape wound around the reel, the tension decreases from an inner side toward an outer side of the reel, and a decrease rate of the tension at the first region of the magnetic tape is larger than a decrease rate of the tension at the second region of the magnetic tape, such that the degree of elongation of the first region of the magnetic tape is larger than the degree of elongation of the second region of the magnetic tape. ### Claim 2 (depends on 1) The magnetic tape cartridge according to claim 1, wherein the second region includes an intermediate region in the longitudinal direction of the magnetic tape. ### Claim 3 (depends on 1) The magnetic tape cartridge according to claim 1, wherein a plurality of servo patterns are formed in the magnetic tape in the longitudinal direction, and the degree of elongation is obtained based on a first interval, which is an interval between the servo patterns adjacent to each other in the longitudinal direction of the magnetic tape in the first region, and a second interval, which is an interval between the servo patterns adjacent to each other in the longitudinal direction of the magnetic tape in the second region. ### Claim 4 (depends on 3) The magnetic tape cartridge according to claim 3, wherein a value of the first interval is a statistic value of the intervals between the servo patterns adjacent to each other in the longitudinal direction of the magnetic tape in the first region. ### Claim 5 (depends on 3) The magnetic tape cartridge according to claim 3, wherein a value of the second interval is a statistic value of the intervals between the servo patterns adjacent to each other in the longitudinal direction of the magnetic tape in the second region. ### Claim 6 (depends on 1) A magnetic tape drive comprising: a processor; and a tension application mechanism, wherein the processor is configured to cause the tension application mechanism to apply a tension to the magnetic tape provided in the magnetic tape cartridge according to claim 1, and the tension is determined in accordance with the degree of elongation. ### Claim 7 (depends on 6) The magnetic tape drive according to claim 6, wherein the degree of elongation is determined in accordance with a longitudinal direction position of the magnetic tape. ### Claim 8 (depends on 7) The magnetic tape drive according to claim 7, wherein the degree of elongation is determined in accordance with a rate of change of the tension with respect to the longitudinal direction position of the magnetic tape. ### Claim 9 (depends on 6) The magnetic tape drive according to claim 6, wherein the processor is configured to acquire tension information related to the tension applied to the magnetic tape, and output the acquired tension information, and the tension information is information for changing a rate of change of the tension with respect to a longitudinal direction position of the magnetic tape in accordance with the longitudinal direction position of the magnetic tape. ### Claim 10 (depends on 1) A tension control method of applying a tension to the magnetic tape provided in the magnetic tape cartridge according to claim 1, the method comprising: changing the degree of elongation; and applying a tension corresponding to the changed degree to the magnetic tape. ### Claim 11 (depends on 10) The tension control method according to claim 10, further comprising: changing a rate of change of the tension with respect to a longitudinal direction position of the magnetic tape in accordance with the longitudinal direction position of the magnetic tape. ### Claim 12 (depends on 10) The tension control method according to claim 10, wherein the degree of elongation is non-linearly decreased from a core side to the outer peripheral side of the reel. ### Claim 13 (depends on 10) A method of handling a magnetic tape, the method comprising: applying the tension to the magnetic tape in accordance with the tension control method according to claim 10; and winding the magnetic tape to which the tension is applied around the reel. ### Claim 14 (depends on 13) The method of handling a magnetic tape according to claim 13, the method further comprising: sending the magnetic tape based on displacement of the tension used in a case in which the magnetic tape is wound around the reel. ### Claim 15 (depends on 10) A method of handling a magnetic tape, the method comprising: transporting the magnetic tape in accordance with the tension control method according to claim 10. ### Claim 16 (depends on 1) A non-transitory storage medium storing a program causing a computer to execute a process, which is a tension control process of applying a tension to the magnetic tape provided in the magnetic tape cartridge according to claim 1, the tension control process comprising: changing the degree of elongation; and applying a tension corresponding to the changed degree of elongation to the magnetic tape.