Tape reels, magnetic tape cartridges, and magnetic tape drives
The tape reel design with a reinforcing member and ribs addresses non-uniform stress distribution issues, enhancing tape reel stability and data accuracy by maintaining uniform stress distribution and bending rigidity, thus improving recording and reading performance.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- FUJIFILM CORP
- Filing Date
- 2022-07-04
- Publication Date
- 2026-05-11
AI Technical Summary
Existing tape reels experience non-uniform deformation of the magnetic tape width due to non-uniform stress distribution when wound around the hub, leading to inaccurate data positioning and poor recording or reading as the data track width narrows with increasing recording density.
A tape reel design featuring a cylindrical hub with a reinforcing member on its inner peripheral side, comprising a shaft member and multiple ribs with varying axial stiffness and spacing, providing uniform stress distribution and improved bending rigidity.
The design reduces non-uniform deformation of the magnetic tape width, ensuring accurate data positioning and improved recording/reading performance by maintaining uniform stress distribution and bending rigidity, even with high recording densities.
Smart Images
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Abstract
Description
Technical Field
[0001] The technology of the present disclosure relates to a tape reel, a magnetic tape cartridge, and a magnetic tape drive.
Background Art
[0002] Patent Document 1 describes a tape reel assembly for winding and unwinding a storage tape, which has a hub defining an inner surface and a tape winding surface, at least a part of the hub being made of plastic, and the tape winding surface having an effective radial modulus greater than 2 GPa.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
[0004] One embodiment of the technology of the present disclosure provides a tape reel, a magnetic tape cartridge, and a magnetic tape drive capable of reducing non-uniform deformation of the width of a magnetic tape caused by non-uniform stress distribution generated in the magnetic tape wound around a hub.
Means for Solving the Problems
[0005] A first aspect of the technology of the present disclosure has a cylindrical hub around which a tape is wound and a reinforcing member provided on the inner peripheral side of the hub. The reinforcing member has a shaft member having a longitudinal direction along the central axis direction of the hub, and a plurality of ribs having an annular shape provided along the longitudinal direction and extending from the outer peripheral surface of the shaft member toward the inner peripheral surface of the hub. The plurality of ribs include a first rib provided in a central region in the longitudinal direction, and is a tape reel.
[0006] A second aspect of the technology of this disclosure is a tape reel according to the first aspect, wherein the plurality of ribs include a second rib provided in a region other than the central region.
[0007] A third aspect of the technology of this disclosure is a tape reel according to the second aspect, wherein the second rib is provided in the region between the central region and one end of the shaft member and in the region between the central region and the other end of the shaft member, respectively.
[0008] A fourth aspect of the technology of this disclosure is that the axial stiffness of the first rib is higher than that of the second rib. This is a tape reel relating to the second or third embodiment.
[0009] A fifth aspect of the technology of this disclosure is a tape reel relating to any one of the first to third aspects, wherein the first rib is provided in multiple locations.
[0010] A sixth aspect of the technology of this disclosure is a tape reel according to the fifth aspect, wherein the spacing between the first ribs is narrower than the spacing between the second ribs and the first ribs.
[0011] A seventh aspect of the technology of this disclosure is a tape reel relating to any one of the first to sixth aspects, wherein the outer edge of the rib is in contact with the inner circumferential surface.
[0012] An eighth aspect of the technology of this disclosure is a tape reel relating to any one of the first to seventh aspects, wherein the ribs have a continuous annular shape.
[0013] A ninth aspect of the technology of this disclosure is a tape reel according to any one of the first to eighth aspects, wherein the reinforcing member is press-fitted into the hub.
[0014] A tenth aspect of the technology of this disclosure is a tape reel according to any one of the first to ninth aspects, wherein the reinforcing member is joined to the hub.
[0015] An eleventh aspect of the technology of this disclosure is a tape reel according to any one of the first to tenth aspects, wherein the bottom of the hub is provided with a support surface to which a rotating shaft for rotating the tape reel is fixed or attached.
[0016] A twelfth aspect of the technology of this disclosure is a magnetic tape cartridge comprising a tape reel according to any one of the first to eleventh aspects on which a magnetic tape is wound as a tape, and a case in which the magnetic tape and the tape reel are housed.
[0017] A thirteenth aspect of the technology of this disclosure is a magnetic tape drive comprising a tape reel according to any one of the first to eleventh aspects on which a magnetic tape is wound as a tape, and a magnetic head that reads the magnetic tape on a predetermined path while the magnetic tape is being driven along the predetermined path by a driving mechanism that drives the magnetic tape along the predetermined path. [Brief explanation of the drawing]
[0018] [Figure 1] This is an external perspective view showing an example of the schematic configuration of a magnetic tape cartridge according to this embodiment. [Figure 2] This is an exploded perspective view showing an example of the schematic configuration of a magnetic tape cartridge according to this embodiment. [Figure 3] This is a cross-sectional view showing an example of the schematic configuration of a conventionally known cartridge reel as a comparative example. [Figure 4] This is a cross-sectional view showing an example of the schematic configuration of a conventionally known cartridge reel as a comparative example. [Figure 5] This is an exploded perspective view showing an example of the schematic configuration of the cartridge reel according to this embodiment. [Figure 6] This is a cross-sectional view showing an example of the schematic configuration of a cartridge reel according to this embodiment. [Figure 7] This is a cross-sectional view showing an example of the schematic configuration of a cartridge reel according to this embodiment. [Figure 8]It is a conceptual diagram showing an example of the hardware configuration of a magnetic tape drive according to this embodiment. [Figure 9] It is a cross-sectional view showing an example of the schematic configuration of a machine reel according to this embodiment. [Figure 10] It is a cross-sectional view showing an example of the schematic configuration of a cartridge reel according to a modification. [Figure 11] It is a cross-sectional view showing an example of the schematic configuration of a cartridge reel according to a modification. [Figure 12] It is a cross-sectional view showing an example of the schematic configuration of a cartridge reel according to a modification.
Mode for Carrying Out the Invention
[0019] First, the terms used in the following description will be explained.
[0020] NVM refers to the abbreviation of "Non-volatile memory". CPU refers to the abbreviation of "Central Processing Unit". RAM refers to the abbreviation of "Random Access Memory". EEPROM refers to the abbreviation of "Electrically Erasable and Programmable Read Only Memory". HDD refers to the abbreviation of "Hard Disk Drive". ASIC refers to the abbreviation of "Application Specific Integrated Circuit". FPGA refers to the abbreviation of "Field-Programmable Gate Array". PLC refers to the abbreviation of "Programmable Logic Controller". IC refers to the abbreviation of "Integrated Circuit". RFID refers to the abbreviation of "Radio Frequency Identifier". UI refers to the abbreviation of "User Interface". WAN refers to the abbreviation of "Wide Area Network". LAN refers to the abbreviation of "Local Area Network".
[0021] [First Embodiment] An example of the configuration of the magnetic tape cartridge 12 will be described with reference to Figures 1 and 2. For the sake of clarity, in the following explanation, the loading direction of the magnetic tape cartridge 12 into the magnetic tape drive 70 (see Figure 8) will be indicated by arrow A, the direction of arrow A will be considered the front direction of the magnetic tape cartridge 12, and the side of the magnetic tape cartridge 12 facing forward will be referred to as the front side of the magnetic tape cartridge 12. In the following description of the structure, "front" refers to the front side of the magnetic tape cartridge 12.
[0022] Furthermore, for the sake of clarity in the following explanation, the direction of arrow B, which is perpendicular to the direction of arrow A, will be referred to as the right direction, and the right side of the magnetic tape cartridge 12 will be referred to as the right side of the magnetic tape cartridge 12. In the following description of the structure, "right" refers to the right side of the magnetic tape cartridge 12.
[0023] Furthermore, for the sake of clarity in the following explanation, the direction opposite to the direction of arrow B will be referred to as the left direction, and the left side of the magnetic tape cartridge 12 will be referred to as the left side of the magnetic tape cartridge 12. In the following description of the structure, "left" refers to the left side of the magnetic tape cartridge 12.
[0024] Furthermore, for the sake of clarity in the following explanation, arrow C will indicate the direction perpendicular to arrows A and B, the direction of arrow C will be considered the upward direction of the magnetic tape cartridge 12, and the upward side of the magnetic tape cartridge 12 will be referred to as the upper side of the magnetic tape cartridge 12. In the following description of the structure, "upper" refers to the upper side of the magnetic tape cartridge 12.
[0025] Furthermore, for the sake of clarity in the following explanation, the direction opposite to the forward direction of the magnetic tape cartridge 12 will be referred to as the rear direction of the magnetic tape cartridge 12, and the side of the magnetic tape cartridge 12 in the rear direction will be referred to as the rear side of the magnetic tape cartridge 12. In the following description of the structure, "rear" refers to the rear side of the magnetic tape cartridge 12.
[0026] Furthermore, for the sake of clarity in the following explanation, the direction opposite to the upward direction of the magnetic tape cartridge 12 will be referred to as the downward direction of the magnetic tape cartridge 12, and the downward side of the magnetic tape cartridge 12 will be referred to as the lower side of the magnetic tape cartridge 12. In the following description of the structure, "down" refers to the lower side of the magnetic tape cartridge 12.
[0027] As an example, as shown in Figure 1, the magnetic tape cartridge 12 is substantially rectangular in plan view and comprises a box-shaped case 14. In this embodiment, the magnetic tape cartridge 12 is an example of a "magnetic tape cartridge" according to the technology of this disclosure, and the case 14 is an example of a "case" according to the technology of this disclosure. The case 14 houses the magnetic tape T. The case 14 is made of a resin such as polycarbonate and comprises an upper case 22 and a lower case 24.
[0028] The magnetic tape cartridge 12 houses a cartridge reel 10, around which a magnetic tape T, which serves as an information recording and playback medium, is wound, within a case 14 that is substantially rectangular in plan view. In this embodiment, the magnetic tape T is an example of the "tape" and "magnetic tape" according to the technology of this disclosure, and the cartridge reel 10 is an example of the "tape reel" according to the technology of this disclosure.
[0029] An opening 16 is provided at the front end of the right side wall 14A of case 14 for pulling the magnetic tape T out of case 14. The opening 16 is closed by a door 18 when the magnetic tape cartridge 12 is not in use. The opening 16 is also opened within the magnetic tape drive 70 (see Figure 8) when the magnetic tape cartridge 12 is in use.
[0030] As an example, as shown in Figure 2, a leader pin 20, which is a leader component, is attached to the tip of the magnetic tape T. The leader pin 20 is cylindrical in shape, and flange portions 20A are provided at both longitudinal ends that protrude above and below the widthwise end of the magnetic tape T. The magnetic tape T is pulled out of the case 14 when the flange portions 20A are hooked onto the pull-out member (not shown) of the magnetic tape drive 70 (see Figure 8).
[0031] In case 14, the upper case 22 and the lower case 24 are joined together. The upper case 22 has a frame-shaped peripheral wall 22B erected along the outer edge of the top plate 22A, which is rectangular in plan view, and the lower case 24 has a peripheral wall 24B erected along the outer edge of the bottom plate 24A, which has a shape corresponding to the top plate 22A. Case 14 is formed into a box shape by joining the upper case 22 and the lower case 24 by ultrasonic welding with the open ends of the peripheral walls 22B and the open ends of the peripheral walls 24B abutting against each other. Although ultrasonic welding has been described as the method of joining the upper case 22 and the lower case 24, the technology of this disclosure is not limited to this. For example, the method of joining the upper case 22 and the lower case 24 may be mechanical joining such as screw fastening.
[0032] The opening 16 is rectangular in shape when viewed from the side and opens to the right at the front end of the right side wall 14A (i.e., the right-facing wall of the case 14, which is composed of the peripheral wall 22B and the peripheral wall 24B) along the direction of arrow A in the case 14. The top plate 22A and the bottom plate 24A are each provided with pin receiving recesses 26 for accommodating the flange portion 20A of the upright leader pin 20. Each pin receiving recess 26 also opens to the right near the front end of the opening 16, allowing the leader pin 20 to enter and exit the case 14 via the opening 16.
[0033] Furthermore, a leaf spring 28 is attached near the front end of the case 14, and the leaf spring 28 is provided with a pair of upper and lower arms 28A. The leaf spring 28 is designed to hold the leader pin 20 relative to the case 14 by engaging the tips of each arm 28A with the flange portion 20A of the leader pin 20. This holding state is released by pulling the leader pin 20 to the right with a force greater than a predetermined value.
[0034] The door 18 is formed in a substantially rectangular, flat shape that can close the opening 16. The upper and lower ends of the door 18 slide into guide grooves 30 provided in the top plate 22A and bottom plate 24A, along the open surface of the opening 16 and the right side wall 14A.
[0035] As a result, the door 18 slides in the front-rear direction while being guided by the guide groove 30, moving between a closed position that closes the opening 16 and an open position that opens the opening 16. In the example shown in Figure 2, the door 18 is biased forward by a coil spring 32, which is a biasing member provided on the case 14. The door 18 is positioned in the closed position by the biasing force. An operating part 18A is provided at the front end of the door 18, protruding to the right, and when the operating part 18A is pressed backward, the door 18 moves to the open position against the biasing force of the coil spring 32.
[0036] Furthermore, a gear opening 34 is provided in the center of the bottom plate 24A of the case 14 to expose the reel gear 49 (see Figure 3), which will be described later, of the cartridge reel 10. The cartridge reel 10 is rotationally driven within the case 14 by the rotation of the rotating shaft 60 (see Figure 7) of the magnetic tape drive 70 (see Figure 8), which is meshed with the reel gear 49.
[0037] Furthermore, the case 14 is equipped with a guide wall 36. The guide wall 36 is formed along a circumference coaxial with the gear opening 34. The guide wall 36 is partially erected from the top plate 22A and the bottom plate 24A. The guide wall 36 suppresses rattling of the cartridge reel 10. In addition, by making its ends continuous with the peripheral walls 22B and 24B, the guide wall 36 prevents dust and other debris from entering the installation area of the cartridge reel 10.
[0038] A cartridge memory M is provided in the lower case 24. Specifically, the cartridge memory M is housed in the right rear end of the lower case 24. The cartridge memory M is equipped with an IC chip having an NVM. In this embodiment, a so-called passive RFID tag is used as the cartridge memory M, and various types of information are read and written to the cartridge memory M without contact.
[0039] The cartridge memory M stores management information for managing the magnetic tape cartridge 12. This management information includes, for example, information about the cartridge memory M (e.g., information that can identify the magnetic tape cartridge 12), information about the magnetic tape T (e.g., information indicating the recording capacity of the magnetic tape T, information indicating an overview of the data recorded on the magnetic tape T, information indicating the data items recorded on the magnetic tape T, and information indicating the recording format of the data recorded on the magnetic tape T), and information about the magnetic tape drive 70 (see Figure 8) (e.g., information indicating the specifications of the magnetic tape drive 70, and signals used by the magnetic tape drive).
[0040] As an example, as shown in Figure 3, the cartridge reel 10 includes a hub 40, an upper flange 48, and a lower flange 46. The hub 40 has a cylindrical shape, and the magnetic tape T is wound around the outer circumferential surface of the hub 40. The hub 40 has a cylindrical portion 42 and a bottom portion 44 formed at the lower end of the cylindrical portion 42. In this embodiment, the hub 40 is an example of a "hub" according to the technology of this disclosure.
[0041] The upper flange 48 has an annular shape that protrudes from the upper end of the hub 40 along the radial direction of the hub 40's central axis. The upper flange 48 is formed as a separate part from the hub 40. The upper flange 48 is attached to the upper end portion 40A of the hub 40. In the example shown in Figure 3, the upper flange 48 is attached to the hub 40 by inserting a projection 48A provided on the opening edge of the upper flange 48 on the central axis CL side into the inner circumference of the hub 40.
[0042] The lower flange 46 has an annular shape that protrudes from the lower end of the hub 40 along the radial direction of the hub 40 (i.e., in a direction perpendicular to the central axis CL). The lower flange 46 is formed integrally with the hub 40.
[0043] Incidentally, a magnetic tape T is wound around the cylindrical portion 42 of the hub 40. By being tightened by the magnetic tape T, a bending load F is generated on the cylindrical portion 42 from the magnetic tape T. An upper flange 48 and a lower flange 46 are provided at the upper end 40A and lower end 40B of the hub 40, respectively. As a result, the rigidity (e.g., bending rigidity) of the upper end 40A and lower end 40B of the hub 40 is higher compared to the central portion of the hub 40 in the vertical direction. This is because the upper flange 48 and lower flange 46, which are continuous in the circumferential direction, function as support members for the hub 40 and contribute to the improvement of rigidity.
[0044] As a result, when deformation occurs in the cylindrical portion 42 due to the tightening of the magnetic tape T, the amount of deformation becomes non-uniform in the direction along the central axis CL of the hub 40 (hereinafter also simply referred to as the "axial direction"). Therefore, the stress distribution in the width direction of the magnetic tape T wound around the cylindrical portion 42 also becomes non-uniform. When the magnetic tape T is stored for a long period of time wound on the cartridge reel 10, deformation (e.g., creep deformation) occurs due to the stress generated in the magnetic tape T. Therefore, if the stress distribution in the width direction of the magnetic tape T becomes non-uniform, the deformation of the width of the magnetic tape T due to the stress distribution also becomes non-uniform. That is, in the magnetic tape T, the width on the core side becomes wider compared to before storage, and the width on the outside becomes narrower compared to before storage. Non-uniform deformation of the width of the magnetic tape T makes it difficult to accurately position the magnetic head relative to the magnetic tape T. As a result, this can cause poor recording or reading of data on the magnetic tape T. This problem becomes even more pronounced as the data track width narrows with increasing recording density of the magnetic tape T.
[0045] As a comparative example, consider the case shown in Figure 4, where a conventionally known reinforcing member 50A has only one rib 54 formed in the central region 52A. In this case, the compressive force from the hub 40 is supported at only one point in the central region 52A. Consequently, deformation occurs at the upper end 40A and the lower end 40B. As a result, when the magnetic tape T is wrapped around the cylindrical portion 42, the difference in the amount of deformation between the central portion in the vertical direction of the hub 40 and the upper end 40A and lower end 40B results in an uneven stress distribution in the width direction of the magnetic tape T. In other words, similar to the case where the reinforcing member 50A is not provided on the inner circumference side of the cylindrical portion 42 of the hub 40 (see Figure 3), the problem of an uneven stress distribution in the width direction of the magnetic tape T occurs.
[0046] As an example, as shown in Figure 5, the cartridge reel 10 in this embodiment is provided with a reinforcing member 50. The reinforcing member 50 is provided on the inner circumference side of the hub 40. The reinforcing member 50 comprises a shaft member 52 and a plurality of ribs 54. In this embodiment, the reinforcing member 50 is an example of a "reinforcing member" according to the technology of this disclosure, the plurality of ribs 54 is an example of a "plural of ribs" according to the technology of this disclosure, and the shaft member 52 is an example of a "shaft member" according to the technology of this disclosure.
[0047] The material of the reinforcing member 50 can be, for example, a polyphenylene sulfide resin containing approximately 40% glass fiber by volume. The reinforcing member 50 is formed, for example, by injection molding. That is, the shaft member 52 and the multiple ribs 54 are molded together as a single unit.
[0048] The shaft member 52 is a rod-shaped member. The longitudinal direction of the shaft member 52 is along the central axis CL of the hub 40. In the example shown in Figure 5, the shaft member 52 is shown as a hollow cylindrical rod-shaped member.
[0049] Multiple ribs 54 are provided along the longitudinal direction of the shaft member 52. When the multiple ribs 54 are provided on the inner circumference side of the cylindrical portion 42, they have an annular shape that extends from the outer circumferential surface of the shaft member 52 toward the inner circumferential surface 42A of the cylindrical portion 42 of the hub 40. Furthermore, the multiple ribs 54 have a continuous annular shape. In the example shown in Figure 5, an example is shown in which five ribs 54 are provided.
[0050] As an example, as shown in Figure 6, in multiple ribs 54, the outer edge 54A abuts against the inner circumferential surface 42A of the cylindrical portion 42 of the hub 40. For example, the reinforcing member 50 is press-fitted into the inner circumferential side of the cylindrical portion 42. As a result, the outer edge 54A of the multiple ribs 54 abuts against the inner circumferential surface 42A. In the case of press-fitting, the length of the multiple ribs 54 (i.e., the distance from the outer circumferential surface of the shaft member 52 along the radial direction of the shaft member 52) may be about 0.1 to 0.2 mm longer than the distance from the outer circumferential surface of the shaft member 52 to the inner circumferential surface 42A of the hub 40. This makes it easier for the outer edge 54A of the multiple ribs 54 to abut against the inner circumferential surface 42A of the hub 40.
[0051] Multiple ribs 54 include a first rib 56 in the central region 52A in the longitudinal direction of the shaft member 52. Here, the central region 52A refers to the range from -0.25L to 0.25L from the midpoint CE in the longitudinal direction of the shaft member 52, where L is the length of the shaft member 52 in the longitudinal direction. Multiple first ribs 56 are provided. In the example shown in Figure 6, three first ribs 56 are provided in the central region 52A, but this is merely one example. There may be two or four or more first ribs 56. In this embodiment, the first rib 56 is an example of the "first rib" according to the technology of this disclosure.
[0052] Furthermore, the multiple ribs 54 include a second rib 58 provided in the longitudinal direction of the shaft member 52 in a region other than the central region 52A. In this embodiment, the second rib 58 is an example of the "second rib" according to the technology of this disclosure. Specifically, the second rib 58 is provided in the upper end region 52B and the lower end region 52C in the longitudinal direction, respectively.
[0053] The axial stiffness of the first rib 56 is set higher than that of the second rib 58. As shown in an enlarged view in Figure 6, three first ribs 56 are provided in the central region 52A. On the other hand, one second rib 58 is provided in the upper end region 52B and one in the lower end region 52C. As a result, the axial stiffness of the first rib 56 is higher than that of the second rib 58. In other words, the first rib 56 is less susceptible to deformation than the second rib 58 when subjected to compressive forces from the cylindrical portion 42 of the hub 40.
[0054] Furthermore, the spacing d1 between multiple first ribs 56 is narrower than the spacing d2 between the second rib 58 and the first rib 56. In other words, among multiple ribs 54, the spacing between adjacent ribs 54 is denser in the central region 52A compared to the upper end region 52B and the lower end region 52C. As a result, the axial stiffness of the first rib 56 is higher than that of the second rib 58.
[0055] As an example, as shown in Figure 7, a support surface 44A is provided on the bottom surface 44 of the hub 40. A rotating shaft 60 that rotates the cartridge reel 10 is attracted to the support surface 44A. In this embodiment, the bottom surface 44 is an example of a "bottom surface" according to the technology of this disclosure, the support surface 44A is an example of a "support surface" according to the technology of this disclosure, and the rotating shaft 60 is an example of a "rotating shaft" according to the technology of this disclosure. The rotating shaft 60 is provided on the magnetic tape drive 70 (see Figure 8) and rotates by receiving a driving force from the delivery motor 86 (see Figure 8). For example, the rotating shaft 60 is attracted to the bottom surface 44 by magnetic action. Specifically, the rotating shaft 60 is attracted to the support surface 44A via a magnet 62. The rotating shaft 60 is further equipped with a rotating shaft gear 64. The rotating shaft gear 64 meshes with the reel gear 49 to transmit the driving force of the rotating shaft 60 to the cartridge reel 10.
[0056] As described above, in the cartridge reel 10 according to this embodiment, a reinforcing member 50 is provided on the inner circumference side of the hub 40 around which the magnetic tape T is wound. The reinforcing member 50 has a plurality of annular ribs 54 along the longitudinal direction of the shaft member 52. The plurality of ribs 54 include a first rib 56 provided in the central region 52A in the longitudinal direction of the shaft member 52. The center of the hub 40 in the direction of the central axis has lower bending rigidity compared to the upper and lower ends of the hub 40 in the direction of the central axis. This is because the upper and lower ends of the hub 40 are supported by other members (for example, the upper flange 48 and the lower flange 46). Therefore, by supporting the inner circumference 42A of the hub 40 with the first rib 56, the bending rigidity at the center in the direction of the central axis of the hub 40 is improved. This contributes to the uniformity of the bending rigidity in the direction of the central axis of the hub 40. As a result, when the magnetic tape T is wound around the hub 40, this contributes to the uniformity of the widthwise stress distribution generated in the magnetic tape T. Therefore, this configuration reduces uneven deformation of the magnetic tape T's width (e.g., uneven creep deformation) caused by the uneven stress distribution in the magnetic tape T wound around the hub 40. For example, compared to a case where the reinforcing member 50 is not provided on the inner circumference side of the hub 40, the bending stiffness distribution in the central axis direction of the hub 40 becomes uniform, and the stress distribution in the magnetic tape T wound around the hub 40 also becomes uniform. As a result, uneven deformation of the magnetic tape T's width (e.g., uneven creep deformation) caused by the uneven stress distribution in the magnetic tape T is reduced.
[0057] Furthermore, in the cartridge reel 10 according to this embodiment, the multiple ribs 54 include a second rib 58 provided outside the central region 52A. As a result, the bending rigidity of the hub 40 is improved even in regions other than the central region 52A, contributing to the uniformity of the bending rigidity in the central axis direction of the hub 40. Therefore, with this configuration, the uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0058] Furthermore, in the cartridge reel 10 according to this embodiment, the second rib 58 is provided in the upper end region 52B and the lower end region 52C, respectively. This improves the bending rigidity in the upper end region 52B and the lower end region 52C, contributing to the uniformity of the bending rigidity in the central axis direction of the hub 40. Accordingly, this configuration reduces uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40.
[0059] Furthermore, in the cartridge reel 10 according to this embodiment, the axial stiffness of the first rib 56 is set higher than that of the second rib 58. In the hub 40, the bending stiffness decreases as you move towards the center in the direction of the central axis. Also, the rib 54 supporting the hub 40 experiences a compressive axial force (i.e., a radial force on the rib 54) due to the bending deformation of the hub 40. Therefore, by setting the axial stiffness of the first rib 56 in the central region 52A of the reinforcing member 50 higher than that of the second rib 58, it contributes to the uniformity of the bending stiffness in the direction of the central axis in the hub 40. Accordingly, this configuration reduces uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution in the magnetic tape T wound around the hub 40.
[0060] Furthermore, in the cartridge reel 10 according to this embodiment, the provision of multiple first ribs 56 improves the axial rigidity of the central region 52A of the reinforcing member 50. This contributes to the uniformity of the bending rigidity in the central axis direction in the hub 40. Therefore, with this configuration, the uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0061] Furthermore, in the cartridge reel 10 according to this embodiment, the spacing between the first ribs 56 is narrower than the spacing between the second rib 58 and the first rib 56. As a result, the axial stiffness of the central region 52A of the reinforcing member 50 is set higher than the axial stiffness in regions other than the central region 52A. This contributes to the uniformity of the bending stiffness in the central axis direction in the hub 40. Therefore, according to this configuration, the uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0062] Furthermore, in the cartridge reel 10 according to this embodiment, the outer edges 54A of the multiple ribs 54 abut against the inner circumferential surface 42A of the hub 40. As a result, the hub 40 is supported by the ribs 54 of the reinforcing member 50 from the beginning of deformation. This contributes to the uniformity of the bending rigidity in the central axis direction in the hub 40. Therefore, with this configuration, the uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0063] Furthermore, in the cartridge reel 10 according to this embodiment, the multiple ribs 54 have a continuous annular shape. As a result, the hub 40 is supported by the ribs 54 of the reinforcing member 50 over the circumferential direction of the inner circumferential surface 42A of the hub 40. This contributes to the uniformity of the bending rigidity in the central axis direction of the hub 40. Therefore, with this configuration, the uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0064] Furthermore, in the cartridge reel 10 according to this embodiment, the reinforcing member 50 is press-fitted into the hub 40. As a result, the hub 40 is supported by the ribs 54 of the reinforcing member 50 from the beginning of deformation. This contributes to the uniformity of the bending rigidity in the central axis direction in the hub 40. Therefore, with this configuration, the uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0065] Furthermore, in the cartridge reel 10 according to this embodiment, a support surface 44A is provided on the bottom surface 44 of the hub 40, to which the rotating shaft 60 that rotates the cartridge reel 10 is attracted. Due to the provision of the support surface 44A, the bending rigidity of the hub 40 is locally increased near the support surface 44A. As a result, the bending rigidity in the hub 40 in the direction of the central axis becomes non-uniform. In this embodiment, a reinforcing member 50 is provided, which contributes to the uniformity of the bending rigidity of the hub 40. Therefore, with this configuration, the non-uniform deformation of the width of the magnetic tape T (for example, non-uniform creep deformation) caused by the non-uniform stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0066] Furthermore, in the magnetic tape cartridge 12 according to this embodiment, a cartridge reel 10 equipped with a reinforcing member 50 is provided, and the cartridge reel 10 is housed in a case 14. Therefore, with this configuration, uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0067] [Second Embodiment] In the first embodiment described above, an example of a configuration in which the cartridge reel 10 is housed and used within the case 14 of the magnetic tape cartridge 12 was given, but the technology of this disclosure is not limited thereto. In this second embodiment, a case in which a machine reel 88 provided within a magnetic tape drive 70 has a configuration similar to that of the cartridge reel 10 is described. In this embodiment, the magnetic tape drive 70 is an example of a "magnetic tape drive" according to the technology of this disclosure.
[0068] As an example, as shown in Figure 8, the magnetic tape drive 70 includes a transport device 72, a magnetic head 73, a control device 74, a storage device 76, a UI system device 78, and a communication interface 80. A magnetic tape cartridge 12 is loaded into the magnetic tape drive 70 along the direction of arrow A. In the magnetic tape drive 70, the magnetic tape T is pulled out from the magnetic tape cartridge 12 and used.
[0069] The magnetic tape drive 70 pulls out the magnetic tape T from the magnetic tape cartridge 12, and uses the magnetic head 73 to record data on the surface S of the pulled-out magnetic tape T, or to read data from the surface S of the pulled-out magnetic tape T using the magnetic head 73.
[0070] The control device 74 controls the entire magnetic tape drive 70. In this embodiment, the control device 74 is implemented by an ASIC, but the technology of this disclosure is not limited thereto. For example, the control device 74 may be implemented by an FPGA and / or a PLC. Alternatively, the control device 74 may be implemented by a computer including a CPU, flash memory (e.g., EEPROM and / or SSD, etc.), and RAM.
[0071] The storage device 76 is connected to the control device 74, which writes various types of information to and reads various types of information from the storage device 76. An example of the storage device 76 is a flash memory and / or an HDD.
[0072] The UI device 78 is a device that has a receiving function to receive instruction signals indicating instructions from the user and a presentation function to present information to the user. The receiving function is implemented by, for example, a touch panel, hard keys (e.g., a keyboard), and / or a mouse. The presentation function is implemented by, for example, a display, a printer, and / or a speaker. The UI device 78 is connected to the control device 74. The control device 74 acquires the instruction signals received by the UI device 78. Under the control of the control device 74, the UI device 78 presents various information to the user.
[0073] The communication interface 80 is connected to the control device 74. The communication interface 80 is also connected to an external device 82 via a communication network such as a WAN and / or LAN (not shown). The communication interface 80 is responsible for the exchange of various types of information between the control device 74 and the external device 82 (for example, recording data for the magnetic tape T, data read from the magnetic tape T, and / or instruction signals given to the control device 74). Examples of the external device 82 include a personal computer or a mainframe.
[0074] The magnetic head 73 comprises a magnetic element unit 73A and a holder 73B. The magnetic element unit 73A is held by the holder 73B so as to be in contact with the moving magnetic tape T. The magnetic element unit 73A has a plurality of magnetic elements. In this embodiment, the magnetic head 73 is an example of a "magnetic head" according to the technology of this disclosure.
[0075] The magnetic element unit 73A records data on the magnetic tape T transported by the transport device 72, and reads data from the magnetic tape T transported by the transport device 72.
[0076] The magnetic tape drive 70 is equipped with a non-contact read / write device 84. The non-contact read / write device 84 is positioned on the underside of the magnetic tape cartridge 12 when the magnetic tape cartridge 12 is loaded, facing the cartridge memory M, and reads and writes information to the cartridge memory M without contact.
[0077] The transport device 72 is a device that selectively transports the magnetic tape T along a predetermined path in the forward and reverse directions, and includes a feed motor 86, a machine reel 88, a wind-up motor 90, and a plurality of guide rollers GR. Here, the forward direction refers to the direction in which the magnetic tape T is fed out, and the reverse direction refers to the direction in which the magnetic tape T is rewound. In this embodiment, the transport device 72 is an example of a "travel mechanism" according to the technology of this disclosure.
[0078] The feed motor 86 rotates the cartridge reel 10 inside the magnetic tape cartridge 12 under the control of the control device 74. The control device 74 controls the rotation direction, rotation speed, and rotation torque of the cartridge reel 10 by controlling the feed motor 86.
[0079] The winding motor 90 rotates the machine reel 88 under the control of the control device 74. The control device 74 controls the direction of rotation, rotational speed, and rotational torque of the machine reel 88 by controlling the winding motor 90.
[0080] When the magnetic tape T is being wound onto the machine reel 88, the control device 74 rotates the feed motor 86 and the take-up motor 90 so that the magnetic tape T travels forward along a predetermined path. The rotational speed and torque of the feed motor 86 and the take-up motor 90 are adjusted according to the speed at which the magnetic tape T is wound onto the machine reel 88. Furthermore, tension is applied to the magnetic tape T by adjusting the respective rotational speeds and torques of the feed motor 86 and the take-up motor 90 by the control device 74. The tension applied to the magnetic tape T is controlled by adjusting the respective rotational speeds and torques of the feed motor 86 and the take-up motor 90 by the control device 74.
[0081] When rewinding the magnetic tape T onto the cartridge reel 10, the control device 74 rotates the feed motor 86 and the take-up motor 90 so that the magnetic tape T travels in the reverse direction along a predetermined path.
[0082] Each of the multiple guide rollers GR is a roller that guides the magnetic tape T. The predetermined path, i.e., the path along which the magnetic tape T travels, is determined by the arrangement of the multiple guide rollers GR between the magnetic tape cartridge 12 and the machine reel 88, at positions that straddle the magnetic head 73.
[0083] As an example, as shown in Figure 9, the machine reel 88 comprises a hub 40, an upper flange 48, and a lower flange 46. The hub 40 has a cylindrical shape, and the magnetic tape T is wound around the outer circumferential surface of the hub 40. The hub 40 has a cylindrical portion 42 and a bottom portion 44 formed at the lower end of the cylindrical portion 42. A reinforcing member 50 is provided on the inner circumference of the hub 40. The reinforcing member 50 is provided with a plurality of ribs 54.
[0084] The bottom portion 44 has a support surface 44A. The support surface 44A is to which a rotating shaft 60 that rotates the cartridge reel 10 is fixed. For example, the rotating shaft 60 is fixed to the bottom portion 44 by a fastening member 66 (for example, a screw) with one end of the rotating shaft 60 inserted into a fitting portion 44B provided on the support surface 44A. The rotating shaft 60 transmits the driving force to the cartridge reel 10.
[0085] As described above, in the machine reel 88 according to this embodiment, a support surface 44A is provided on the bottom surface 44 of the hub 40 to which a rotating shaft 60 for rotating the machine reel 88 is fixed. Due to the provision of the support surface 44A, the bending rigidity of the hub 40 is locally increased near the support surface 44A. As a result, the bending rigidity in the hub 40 in the direction of the central axis becomes non-uniform. In this embodiment, a reinforcing member 50 is provided, which contributes to the uniformity of the bending rigidity of the hub 40. Therefore, with this configuration, the non-uniform deformation of the width of the magnetic tape T (for example, non-uniform creep deformation) caused by the non-uniform stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0086] Furthermore, the magnetic tape drive 70 according to this embodiment is provided with a machine reel 88 equipped with a reinforcing member 50. Therefore, with this configuration, uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0087] Furthermore, while the second embodiment described above illustrates a magnetic tape drive 70 into which a magnetic tape cartridge 12 is loaded, the technology of this disclosure is not limited thereto. For example, a magnetic tape drive 70 in which a magnetic tape T, not contained in a magnetic tape cartridge 12, is wound around a feed reel, i.e., a magnetic tape drive 70 in which the magnetic tape T is fixed and not replaceable, may also be used. In this case, the same configuration as that of the machine reel 88 may be applied to the feed reel.
[0088] (First variation) In the embodiments described above, examples were given in which the reinforcing member 50 is press-fitted into the hub 40, but the technology of this disclosure is not limited thereto. In this first modified example, the reinforcing member 50 is joined to the hub 40. After the reinforcing member 50 is inserted into the hub 40, the reinforcing member 50 and the hub 40 are joined by, for example, ultrasonic welding, which welds the outer edges 54A of the multiple ribs 54 to the inner circumferential surface 42A of the hub 40. Although ultrasonic welding is given as a joining method here, this is merely one example. Other joining methods may include crimping, brazing, heat welding, or mechanical joining (e.g., screw fastening).
[0089] As described above, in the cartridge reel 10 according to this embodiment, the reinforcing member 50 is joined to the hub 40. As a result, the hub 40 is supported by the ribs 54 of the reinforcing member 50 from the beginning of deformation. This contributes to the uniformity of the bending rigidity in the central axis direction in the hub 40. Therefore, with this configuration, the uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0090] (Second variation) In the embodiments described above, an example was given in which the inner circumferential surface 42A of the hub 40 is a surface aligned with the central axis direction of the hub 40, but the technology of this disclosure is not limited thereto. In this second modified example, the cylindrical portion 42 of the hub 40 is provided with a taper.
[0091] As an example, as shown in Figure 10, the radial thickness of the cylindrical portion 42 of the hub 40 decreases towards the upper end of the cylindrical portion 42. That is, the inner circumferential surface 42A of the cylindrical portion 42 of the hub 40 is inclined with respect to the central axis of the hub 40. The angle α of the inclination of the inner circumferential surface 42A (i.e., the angle of the inclination with respect to the central axis CL) is, for example, 0.5 to 1 degree. In the example shown in Figure 10, the angle α is exaggerated to make it easier to visually grasp.
[0092] The length of the rib 54 of the reinforcing member 50 (i.e., the distance along the radial direction of the shaft member 52 from the outer circumferential surface of the shaft member 52) is determined by the taper angle α of the hub 40. In the example shown in Figure 10, the length of the rib 54 is set to be longer towards the opening side (i.e., the upper end 40A side). In addition, the outer edge 54A of the rib 54 is a sloped surface with an angle corresponding to the taper angle α of the hub 40.
[0093] The reinforcing member 50 is press-fitted into the hub 40 (see arrow D in the figure). During this process, the reinforcing member 50 is positioned by a taper provided in the hub 40 while being press-fitted. Specifically, the inner diameter of the cylindrical portion 42 of the hub 40 is wider on the opening side (i.e., the upper end 40A side) than on the lower end 40B side. Therefore, when the press-fitting of the reinforcing member 50 begins, it is easy to insert the reinforcing member 50 into the hub 40, and when the press-fitting is complete, the reinforcing member 50 is in a predetermined position within the hub 40.
[0094] Furthermore, in the reinforcing member 50, the axial stiffness of the multiple ribs 54 may be changed according to the taper provided in the hub 40. That is, the radial thickness of the cylindrical portion 42 of the hub 40 decreases as it approaches the upper end 40A of the hub 40. Consequently, the bending stiffness of the hub 40 decreases as it approaches the upper end 40A of the hub 40. The axial stiffness of the ribs 54 of the reinforcing member 50 may be set to increase as it approaches the position corresponding to the upper end 40A of the hub 40. For example, the thickness of the ribs 54 of the reinforcing member 50 (i.e., the distance along the longitudinal direction of the axial member 52) may be set to increase as it approaches the position corresponding to the upper end 40A.
[0095] As explained above, the reinforcing member 50 is press-fitted into the hub 40. Furthermore, the cylindrical portion 42 of the hub 40 is tapered. As a result, the hub 40 is supported by the hub 40 of the reinforcing member 50 from the beginning of deformation. This contributes to the uniformity of the bending stiffness in the central axis direction of the hub 40. Therefore, with this configuration, the uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution in the magnetic tape T wound around the hub 40 is reduced.
[0096] (Third variation) In the embodiments described above, the reinforcing member 50 is shown in which the spacing d1 between the first ribs 56 and the spacing d2 between the second rib 58 and the first rib 56 are varied, but the technology of this disclosure is not limited thereto. In this third modified example, in the reinforcing member 50, a plurality of ribs 54 are arranged at equal intervals along the longitudinal direction of the axial member 52. In this embodiment, "equal intervals" refers not only to perfectly equal intervals but also to equal intervals that include errors that are generally acceptable in the art to which the technology of this disclosure belongs, and that do not contradict the spirit of the technology of this disclosure.
[0097] As an example, as shown in Figure 11, three first ribs 56 are provided in the central region 52A. In addition, one second rib 58 is provided in the upper end region 52B and the lower end region 52C, respectively. Furthermore, the spacing d1 between multiple first ribs 56 is set to be equal to the spacing d2 between the second rib 58 and the first rib 56.
[0098] Even in this case, the multiple ribs 54 suppress the deformation of the cylindrical portion 42 of the hub 40, so that the bending rigidity is improved in the central region 52A and in regions other than the central region 52A. As a result, this contributes to the uniformity of the bending rigidity in the central axis direction of the hub 40. Therefore, according to this third modification, the uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution that occurs in the magnetic tape T wound around the hub 40 is reduced.
[0099] (Fourth variation) In each of the embodiments described above, examples were given in which the plurality of ribs 54 include a first rib 56 and a second rib 58, but the technology of this disclosure is not limited thereto. In this fourth modification, the plurality of ribs 54 include only the first rib 56.
[0100] As an example, as shown in Figure 12, in the reinforcing member 50, the multiple ribs 54 include three first ribs 56. The three first ribs 56 are provided in the central region 52A. The spacing d1 between the three first ribs 56 is equal.
[0101] Even in this case, the deformation of the cylindrical portion 42 of the hub 40 is supported by multiple ribs 54, improving the bending rigidity in the central region 52A. As a result, this contributes to the uniformity of the bending rigidity in the hub 40 in the direction of the central axis. Therefore, with this configuration, the uneven deformation of the width of the magnetic tape T (for example, uneven creep deformation) caused by the uneven stress distribution in the magnetic tape T wound around the hub 40 is reduced.
[0102] (Other variations) In the embodiments described above, examples were given in which one second rib 58 is provided in the upper end region 52B and the lower end region 52C, but the technology of this disclosure is not limited thereto. For example, multiple second ribs 58 may be provided in the upper end region 52B and the lower end region 52C, or the second rib 58 may be provided in only one of the upper end region 52B and the lower end region 52C.
[0103] Furthermore, in each of the above embodiments, examples of forms in which a difference in axial stiffness is provided between the first rib 56 and the second rib 58 were described by changing the spacing between the first ribs 56 and the spacing between the second rib 58 and the first rib 56. However, the technology of this disclosure is not limited thereto. For example, a difference in axial stiffness may be provided by making the first rib 56 of a material with higher axial stiffness than the second rib 58. Alternatively, a difference in axial stiffness may be provided by making the thickness of the first rib 56 (i.e., the distance along the longitudinal direction of the axial member 52) greater than the thickness of the second rib 58.
[0104] Furthermore, although the above embodiments have described examples in which the multiple ribs 54 are continuous annular shapes, the technology of this disclosure is not limited thereto. The multiple ribs 54 may be discontinuous annular shapes. For example, some or all of the multiple ribs 54 may have a shape with a notch in a part of the circumferential direction (for example, a C-shape when the rib 54 is viewed from the longitudinal direction of the shaft member 52).
[0105] The technology disclosed herein can be appropriately combined with the various embodiments and / or modifications described above. Furthermore, it is understood that various configurations can be adopted without departing from the spirit of the invention, and are not limited to the embodiments described above.
[0106] The descriptions and illustrations presented above are detailed explanations of the technical aspects of this disclosure and are merely examples of the technical aspects. For example, the above descriptions of the structure, function, operation, and effect are examples of the structure, function, operation, and effect of the technical aspects of this disclosure. Therefore, it goes without saying that you may delete unnecessary parts, add new elements, or replace elements in the descriptions and illustrations presented above, as long as you do not deviate from the essence of the technical aspects of this disclosure. Furthermore, in order to avoid confusion and facilitate understanding of the technical aspects of this disclosure, explanations of common technical knowledge and the like that do not require special explanation to enable the implementation of the technical aspects of this disclosure have been omitted from the descriptions and illustrations presented above.
[0107] In this specification, "A and / or B" is synonymous with "at least one of A and B." That is, "A and / or B" means that it may be A alone, or B alone, or a combination of A and B. Furthermore, in this specification, the same concept as "A and / or B" applies when expressing three or more things linked by "and / or."
[0108] All documents, patent applications, and technical standards described herein are incorporated by reference to the same extent as if each individual document, patent application, and technical standard were specifically and individually noted as being incorporated by reference.
[0109] The following additional information is disclosed regarding the embodiments described above.
[0110] (Note 1) A cylindrical hub around which the tape is wound, A reinforcing member provided on the inner circumference side of the hub, It has, The above reinforcing member is, The hub has a shaft member having a longitudinal direction along the central axis direction, and a plurality of annular ribs provided along the longitudinal direction and extending from the outer circumferential surface of the shaft member toward the inner circumferential surface of the hub. The above-mentioned plurality of ribs include a first rib provided in the central region in the longitudinal direction. Tape reel. (Note 2) The above-mentioned multiple ribs include a second rib provided in a region other than the central region. The tape reel described in Appendix 1. (Note 3) The second rib is provided in the region between the central region and one end of the shaft member, and in the region between the central region and the other end of the shaft member, respectively. The tape reel described in Appendix 2. (Note 4) The axial stiffness of the first rib is higher than that of the second rib. The tape reel described in Appendix 2 or Appendix 3. (Note 5) Multiple of the above-mentioned first ribs are provided. The tape reel specified in any one of the notes 1 through 3. (Note 6) The spacing between the first ribs is narrower than the spacing between the second ribs and the first ribs. The tape reel described in Appendix 5. (Note 7) The outer edge of the rib is in contact with the inner circumferential surface. The tape reel specified in any one of the appendices 1 through 6. (Note 8) The above ribs have a continuous annular shape. The tape reel specified in any one of the appendices 1 through 7. (Note 9) The reinforcing member is press-fitted into the hub. The tape reel specified in any one of the appendices 1 through 8. (Note 10) The reinforcing member is joined to the hub. The tape reel specified in any one of the appendices 1 through 9. (Note 11) The bottom of the hub is provided with a support surface to which the rotating shaft that rotates the tape reel is fixed or attached. The tape reel specified in any one of the appendices 1 through 10. [Explanation of Symbols]
[0111] 10 cartridge reels 12 Magnetic Tape Cartridges 14 cases 14A Right side wall 16 aperture 18 doors 18A Control unit 20 Leader pins 20A Flange section 22 Upper case 22A Top plate 22B Peripheral wall 24 Lower case 24A bottom plate 24B Peripheral wall 26 recesses 28A Each arm 28A Arm 30 guide grooves 34 Gear opening 36. Guidance barrier 40 Hub 40A upper end 40B Bottom end 42 Cylindrical section 42A Inner surface 44 Bottom part 44A Support surface 44B Mating section 46 Lower flange 48 Upper flange 48A Protrusion 49 Reel Gear 50, 50A Reinforcement Member 52 Shaft member 52A Central area 52B Upper end area 52C Lower end area 54 Ribs 54A Outer edge 56. First Rib 58. Second Rib 60 Rotation axis 62 Magnets 64 Rotating shaft gear 66 Fastening members 70 Magnetic Tape Drives 72 Conveying device 73 Magnetic Head 73A Magnetic Element Unit 73B Holder 74 Control device 76 storage 78 UI devices 80 Communication Interfaces 82 External device 84. Contactless reading and writing devices 86 Sending motor 88 Machine Reels 90 Rewinding motor α angle A, B, C, D arrows CL center axis CE midpoint F load GR Guide Roller M Cartridge Memory S surface T Magnetic Tape d1,d2 interval
Claims
1. A cylindrical hub around which the tape is wound, A reinforcing member provided on the inner circumference side of the hub, It has, The reinforcing member is The hub has a shaft member having a longitudinal direction along the central axis direction, and a plurality of annular ribs provided along the longitudinal direction and extending from the outer circumferential surface of the shaft member toward the inner circumferential surface of the hub, The plurality of ribs include a first rib provided in the central region in the longitudinal direction. Tape reel.
2. The plurality of ribs include a second rib provided in a region other than the central region. The tape reel according to claim 1.
3. The second rib is provided in the region between the central region and one end of the shaft member, and in the region between the central region and the other end of the shaft member, respectively. The tape reel according to claim 2.
4. The axial stiffness of the first rib is higher than that of the second rib. The tape reel according to claim 2.
5. Multiple first ribs are provided. The tape reel according to claim 2.
6. The spacing between the first ribs is narrower than the spacing between the second ribs and the first ribs. The tape reel according to claim 5.
7. The outer edge of the rib is in contact with the inner circumferential surface. The tape reel according to claim 1.
8. The rib has a continuous annular shape. The tape reel according to claim 1.
9. The reinforcing member is press-fitted into the hub. The tape reel according to claim 1.
10. The reinforcing member is joined to the hub. The tape reel according to claim 1.
11. The bottom of the hub is provided with a support surface to which the rotating shaft that rotates the tape reel is fixed or attached. The tape reel according to claim 1.
12. A tape reel according to any one of claims 1 to 11, on which a magnetic tape is wound as the tape, A case in which the magnetic tape and the tape reel are housed, Equipped with Magnetic tape cartridge.
13. A tape reel according to any one of claims 1 to 11, on which a magnetic tape is wound as the tape, A magnetic head reads the magnetic tape on the predetermined path while the magnetic tape is being driven along the predetermined path by a driving mechanism that drives the magnetic tape along the predetermined path, A magnetic tape drive equipped with a magnetic tape drive.