# US 7,407,125 B2 · Recording tape cartridge and driving device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,407,125 B2 - Document ID: US7407125B2 - Status: Granted - Kind: B2 - Application number: 11/545,532 - Filed: 2006-10-11 - Published: 2007-04-12 - Granted: 2008-08-05 - Earliest claimed: 2005-10-11 - Assignees: FUJIFILM Corporation - Inventors: Hideaki Shiga - Web page: https://patentgrep.com/patent/US7407125B2 ## CPC - G11B 23/044: {Reels or cores; positioning of the reels in the cassette} - G11B 15/674: {Threading or attaching end of record carrier on or to single reel (G11B15/671 takes precedence)} - G11B 23/107: using one reel or core, one end of the record carrier coming out of the magazine or cassette - 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 In a recording tape cartridge provided with a reel having a hub at which a recording tape is wound, a case that accommodates the reel such that the reel is rotatable, and an opening formed at the case from which a leader member attached to a distal end of the recording tape is pulled out, the hub is formed in a substantial barrel shape. Further, the hub of a take-up reel of a drive device into which the recording tape cartridge is loaded is formed in a substantial barrel shape. ## Claims ### Claim 1 A recording tape cartridge, comprising: a reel having a recording tape wound at a hub; a case accommodating the reel such that the reel is rotatable; and an opening formed at the case from which a leader member attached to a distal end of the recording tape is pulled out, wherein the hub is formed in a substantial barrel shape, and the recording tape is wound such that the recording tape is regulated at a substantially central portion of the hub in a transverse direction of the hub; and wherein the difference between the maximum radius and the minimum radius of the hub is from 0.03 mm to 0.30 mm. ### Claim 2 (depends on 1) The recording tape cartridge of claim 1, wherein the difference between the maximum radius and the minimum radius of the hub is from 0.2% to 2.5% with respect to a transverse dimension of the recording tape. ### Claim 3 (depends on 1) The recording tape cartridge of claim 1, wherein the maximum radius of the hub is at the substantially central portion of the hub in the transverse direction of the hub, and the minimum radius of the hub is at an end portion of the hub in the transverse direction of the hub. ### Claim 4 (depends on 3) The recording tape cartridge of claim 3, wherein, when the recording tape cartridge is loaded into a drive device, a center position in a transverse direction of the recording tape when traveling is substantially aligned with a center position in a transverse direction of the hub. ### Claim 5 (depends on 4) The recording tape cartridge of claim 4, further comprising a tape guide provided inside the case such that the recording tape slidably contacts the tape guide at least while the leader member is being pulled out from the opening. ### Claim 6 (depends on 5) The recording tape cartridge of claim 5, wherein the tape guide has a substantially cylindrical shape with flanges formed at distal ends in a transverse direction and is structured so as to be rotatable in conjunction with the recording tape slidably contacting the tape guide. ### Claim 7 (depends on 5) The recording tape cartridge of claim 5, further comprising a position adjustment unit that enables the tape guide to move in conjunction with the reel to the same height when the recording tape cartridge is loaded into the drive device. ### Claim 8 (depends on 7) The recording tape cartridge of claim 7, wherein the position adjustment unit comprises: an urging unit that urges the tape guide toward a floor plate of the case; and a hole that in plan view overlaps the flange which is formed at a transverse direction end of the tape guide, and is provided at the floor plate of the case, the position adjustment unit being configured such that when the recording tape cartridge is loaded into the drive device, an engaging member provided at the drive device enters in from the hole and causes the tape guide to move toward a ceiling plate of the case against the urging force of the urging unit via the flange. ### Claim 9 (depends on 8) The recording tape cartridge of claim 8, further comprising a cover that can close the hole when the recording tape cartridge is not loaded into the drive device. ### Claim 10 (depends on 5) The recording tape cartridge of claim 5, wherein the tape guide is formed in a substantial barrel shape. ### Claim 11 (depends on 1) The recording tape cartridge of claim 1, wherein the case accommodates the single reel such that the single reel is rotatable. ### Claim 12 (depends on 1) The recording tape cartridge of claim 1, wherein the difference between the maximum radius and the minimum radius of the hub is from 0.08 mm to 0.20 mm. ### Claim 13 (depends on 1) The recording tape cartridge of claim 1, wherein the difference between the maximum radius and the minimum radius of the hub is from 0.10 mm to 0.20 mm. ### Claim 14 : A drive device, comprising a take-up reel that winds up a recording tape pulled out from a recording tape cartridge loaded into the drive device, wherein a hub of the take-up reel is formed in a substantial barrel shape, and the recording tape is wound such that the recording tape is regulated at a substantally central portion of the hub in a transverse direction of the hub; and wherein the difference between the maximum radius and the minimum radius of the hub is from 0.03 mm to 0.30 mm. ### Claim 15 (depends on 14) The drive device of claim 14, wherein the difference between the maximum radius and the minimum radius of the hub is from 0.2% to 2.5% with respect to a transverse dimension of the recording tape. ### Claim 16 (depends on 14) The drive device of claim 14, wherein the maximum radius of the hub is at the substantially central portion of the hub in the transverse direction of the hub, and the minimum radius of the hub is at an end portion of the hub in the transverse direction of the hub. ### Claim 17 (depends on 16) The drive device of claim 16, a center position in a transverse direction of the recording tape is substantially aligned with a center position in a transverse direction of the hub. ### Claim 18 (depends on 14) The drive device of claim 14, wherein the difference between the maximum radius and the minimum radius of the hub is from 0.08 mm to 0.20 mm. ### Claim 19 (depends on 14) The drive device of claim 14, wherein the difference between the maximum radius and the minimum radius of the hub is from 0.10 mm to 0.20 mm.