JP2010211871A - Recording tape cartridge - Google Patents

Abstract

An object of the present invention is to provide a recording tape cartridge capable of adding a security function for preventing theft without taking up space at a low cost.
A case 12 that accommodates a single reel 20 around which a recording tape T is wound, a leader member 30 provided at an end of the recording tape T and drawn out from an opening 18 formed in the case 12, Amorphous magnetic wire 100 formed of a resin material in a substantially right triangular prism shape or a substantially right triangular tube shape having a slope 102A on which a non-contact type memory board M storing various information is provided, and having a large Barkhausen effect The recording tape cartridge 10 is provided with a support member 102 coupled to the case 12 by the coupling means 110.
[Selection] Figure 6

Description

  The present invention relates to a recording tape cartridge having a single reel around which a recording tape such as a magnetic tape used mainly as a recording / reproducing medium of a computer or the like is wound.

  2. Description of the Related Art Conventionally, a recording tape cartridge in which a recording tape such as a magnetic tape is wound around a reel and the reel is accommodated in a case is known. Since this recording tape cartridge is often used as a data recording / reproducing medium (data backup) for a computer or the like, security measures for theft prevention may be taken.

  For example, a storage container containing a security tag is provided in the case of the recording tape cartridge, and when the recording tape cartridge is unloaded from a predetermined security area, this is notified to the outside to prevent the recording tape cartridge from being stolen. The system which performs is proposed conventionally (for example, refer patent document 1).

JP 2008-90942 A

  However, if the storage container in which the security tag is stored is provided in the case of the recording tape cartridge, the space in the case is limited, and thus the shape and arrangement direction of the storage container are restricted. There's a problem. Moreover, since the number of parts increases by the amount of the storage container, there is a problem that the manufacturing cost increases.

  In view of the above circumstances, an object of the present invention is to obtain a recording tape cartridge to which a security function for preventing theft can be added without taking up space at a low cost.

  In order to achieve the above object, a recording tape cartridge according to claim 1 according to the present invention is provided at a case for accommodating a reel around which a recording tape is wound, and at an end of the recording tape. The resin member is formed in a substantially right triangular prism shape or a substantially right triangular cylinder shape having a leader member drawn out from an opening formed in the case and a slope provided with a non-contact type memory board storing various information. In addition, an amorphous magnetic wire having a large Barkhausen effect is provided, and the support member is coupled to the case by a coupling means.

  According to the first aspect of the present invention, an amorphous magnetic wire having a large Barkhausen effect is provided on a support member having a substantially right triangular prism shape or a substantially right triangular tube shape for providing a non-contact type memory board in the case. In addition, since a security function is added, a space for providing the amorphous magnetic wire is not taken up separately. In addition, since a support member for supporting the memory board is used, the number of parts is not increased and the cost can be reduced. That is, according to the present invention, a security function for theft prevention can be added at low cost and without taking up space.

  The recording tape cartridge according to claim 2 is the recording tape cartridge according to claim 1, wherein the coupling means is formed in a claw portion formed at a substantially right angle portion of the support member, and the case. A locking portion for locking the claw portion, and the support member is configured to be detachable from the case.

  According to the second aspect of the present invention, the supporting member provided with the amorphous magnetic wire having the large Barkhausen effect can be taken out from the discarded recording tape cartridge and reused. Therefore, the manufacturing cost of the recording tape cartridge can be reduced.

  According to a third aspect of the present invention, there is provided the recording tape cartridge according to the first or second aspect, wherein the memory board is configured to be detachable from the support member. .

  According to the third aspect of the present invention, a memory board more expensive than an amorphous magnetic wire can be taken out from the discarded recording tape cartridge and reused. Therefore, the manufacturing cost of the recording tape cartridge can be further reduced.

  As described above, according to the present invention, it is possible to provide a recording tape cartridge to which a security function for preventing theft can be added at low cost and without taking up space.

Schematic perspective view of recording tape cartridge Schematic exploded perspective view of the recording tape cartridge as viewed from above Schematic exploded perspective view of the recording tape cartridge as viewed from below Schematic perspective view showing the support member before being attached to the lower case Schematic perspective view showing the support member after being attached to the lower case Schematic side sectional view showing the support member after being attached to the lower case Schematic perspective view of a support member in which amorphous magnetic wires are randomly encapsulated Schematic perspective view of a support member with an amorphous magnetic wire attached

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings. For convenience of explanation, in FIG. 1, the loading direction of the recording tape cartridge 10 into the drive device is indicated by an arrow A, which is the forward direction (front side) of the recording tape cartridge 10. The arrow B direction orthogonal to the arrow A is the right direction (right side). A direction orthogonal to the arrow A direction and the arrow B direction is indicated by an arrow C, which is an upward direction (upper side) of the recording tape cartridge 10. First, a schematic configuration of the recording tape cartridge 10 will be described.

  As shown in FIGS. 1 to 3, the recording tape cartridge 10 has a case 12 having a substantially rectangular box shape. In the case 12, an upper case 14 and a lower case 16 made of resin such as polycarbonate (PC) are respectively provided with a peripheral wall 14B standing on the periphery of the top plate 14A, and a peripheral wall 16B standing on the periphery of the bottom plate 16A. Are joined together by ultrasonic welding, screwing, or the like.

  That is, for example, in the upper case 14 and the lower case 16, screw bosses 15 are formed in the vicinity of each corner portion, and a screw (not shown) is screwed into the screw boss 15 from the lower surface side of the lower case 16, The case 12 can be assembled. In the case 12, only one reel 20 is rotatably accommodated.

  In the reel 20, a bottomed cylindrical reel hub 22 constituting an axial center portion and a lower flange 26 provided at a lower end portion thereof are integrally formed, and an upper flange 24 is ultrasonically welded to an upper end portion of the reel hub 22. Configured. A recording tape T such as a magnetic tape as an information recording / reproducing medium is wound on the outer peripheral surface of the reel hub 22, and the end of the wound recording tape T in the width direction is wound by the upper flange 24 and the lower flange 26. Part is held.

  A reel gear 44 is formed in an annular shape on the lower surface (outer surface) of the bottom wall (bottom portion) 28 of the reel hub 22, and a gear opening for exposing the reel gear 44 to the outside is formed in the central portion of the lower case 16. 40 is drilled. The reel gear 44 exposed from the gear opening 40 is engaged with a drive gear (not shown) formed on a rotation shaft (not shown) of the drive device and is driven to rotate. Relative rotation with respect to the case 12 is possible.

  A reel plate 46, which is an annular metal plate made of a magnetic material, is fixed coaxially and integrally to the inside of the reel gear 44 on the lower surface of the bottom wall 28 by insert molding. It is attracted and held by the magnetic force of an annular magnet (not shown) provided on the rotating shaft. Further, the reel 20 is partially protruded from the inner surfaces of the upper case 14 and the lower case 16 so that the reel 20 is not rattled by the floating regulation wall 42 as an inner wall on a circular locus coaxial with the gear opening 40. Is held in.

  An opening 18 for pulling out the recording tape T wound around the reel 20 is formed in the right wall 12B of the case 12, and a drive tape is drawn from the opening 18 at the free end of the recording tape T. A leader pin 30 that is pulled out while being locked (engaged) by a drawing member (not shown) of the apparatus is fixed. An annular groove 32 is formed at both end portions of the leader pin 30 protruding from the end portion in the width direction of the recording tape T, and the annular groove 32 is locked to a hook or the like of the drawing member.

  Further, a pair of upper and lower pin holding portions 36 for positioning and holding the leader pin 30 in the case 12 on the inner side of the opening 18 of the case 12, that is, on the inner surface of the top plate 14 A of the upper case 14 and the inner surface of the bottom plate 16 A of the lower case 16. Is provided. The pin holding portion 36 has a substantially semicircular shape with the drawing tape T drawn side open, and both end portions 34 of the leader pin 30 in an upright state can enter and leave the pin holding portion 36 from the open side. Has been.

  In addition, a leaf spring 38 is fixedly disposed in the vicinity of the pin holding portion 36, and the bifurcated tip portion of the leaf spring 38 is engaged with the upper and lower end portions 34 of the leader pin 30. The leader pin 30 is held by the pin holding part 36. When the leader pin 30 enters and exits the pin holding portion 36, the tip of the leaf spring 38 is appropriately elastically deformed to allow movement of the leader pin 30.

  The opening 18 is opened and closed by a door 50. The door 50 is formed in a substantially rectangular plate shape having a size capable of closing the opening 18, and is provided on the top plate 14 </ b> A and the bottom plate 16 </ b> A inside the opening 18 so as to move along the right wall 12 </ b> B of the case 12. A groove portion 64 is formed in which the upper and lower end portions of 50 are slidably fitted.

  A shaft 52 is projected from the center of the rear end of the door 50, and a coil spring 58 is inserted into the shaft 52. An enlarged portion 54 that prevents the coil spring 58 from falling off is formed at the rear end of the shaft 52. Further, the lower case 16 is provided with a support base 60 having a locking portion 62 that locks the rear end of the coil spring 58 inserted into the shaft 52.

  Accordingly, the door 50 is slidably supported on the support base 60 and the rear end of the coil spring 58 is locked to the locking portion 62, so that the door 50 is always urged by the urging force of the coil spring 58. The opening 18 is biased in the closing direction. When the opening 18 is opened, it is preferable that a support base 66 that supports the shaft 52 is further protruded on the rear side of the support base 60.

  Further, a projection 56 for opening / closing operation projects outwardly from the front end of the door 50. The convex portion 56 engages with an opening / closing member (not shown) on the drive device side as the recording tape cartridge 10 is loaded into the drive device. Thereby, the door 50 is configured to be opened against the urging force of the coil spring 58.

  As shown in FIGS. 2 and 3, a write protect 70 that is set to enable / disable recording on the recording tape T is provided in the left rear corner of the case 12 so as to be slidable in the left-right direction. An opening 68 is formed in the rear wall 12D of the case 12 for projecting an operation projection 72 for operating the write protect 70 manually. The opening 68 is formed by a notch 68A formed in the peripheral wall 14B of the upper case 14 and a notch 68B formed in the peripheral wall 16B of the lower case 16 when the upper case 14 and the lower case 16 are joined. It is the structure formed.

  Further, the bottom plate 16A of the lower case 16 is provided with a long hole 69 through which the protrusion 74 of the write protect 70 is exposed in the left-right direction so that the recording tape cartridge 10 is loaded into the drive device. The position of the write protect 70 is detected on the drive device side, and whether or not recording on the recording tape T is possible is automatically determined. The protrusion 74 does not protrude from the lower surface of the bottom plate 16A of the lower case 16.

  As shown in FIGS. 2 and 4 to 6, a non-contact type memory board M in which various information such as a recording capacity and a recording format is stored at a predetermined inclination angle in the right rear corner portion of the case 12. It is arranged. That is, the memory board M is detachably attached to the slope 102A of the resin support member 102 having a substantially right triangular prism shape, and the support member 102 is attached to the right rear corner portion of the lower case 16 by the coupling means 110. It is supposed to be combined.

  More specifically, the inclined surface 102A of the support member 102 is formed with a recess 104 having a size capable of mounting the memory board M. The upper edge and the lower edge of the recess 104 are respectively along the inclined surface 102A. Thus, overhanging portions 105 and 106 projecting inward (toward the concave portion 104 side) are formed.

  Therefore, the memory board M is mounted in the recess 104 to prevent the memory board M from falling off by engaging the upper edge portion and the lower edge portion with the overhang portion 105 and the overhang portion 106, respectively. Further, a claw portion 108 that protrudes rearward is formed in the entire longitudinal direction of the support member 102 at a substantially right angle portion that is the lower rear end portion of the support member 102.

  On the other hand, a predetermined position on the inner surface of the bottom plate 16A in the right rear corner of the lower case 16 (a position spaced apart from the rear wall 12D by a predetermined distance forward, which is slightly shorter than the length of the position support member 102 in the front-rear direction. ), A plurality of (for example, two) holding protrusions 112 are provided to hold the front end portion 103 of the support member 102 so as to be separated in the left-right direction.

  Then, a claw portion 108 of the support member 102 is inserted and locked at a boundary portion (periphery of the bottom plate 16A) between the inner surface of the bottom plate 16A and the inner surface of the rear wall 12D (the peripheral wall 16B) in the right rear corner portion of the lower case 16. A locking groove 114 is formed as a stop.

  Further, a holding rib 116 for holding the left side surface 102C of the support member 102 and a holding rib 118 for holding the right side surface 102B of the support member 102 are respectively provided at predetermined positions on the inner surface of the bottom plate 16A at the right rear corner portion of the lower case 16. Projected. The distance between the left holding rib 116 and the right holding rib 118 is substantially the same as the length of the support member 102 in the left-right direction.

  Accordingly, while the support member 102 is inserted between the holding ribs 116 and 118, the claw portion 108 is inserted and locked in the locking groove 114, and the front end portion 103 is relatively pressed backward by the holding projection 112. By this, it is detachably attached (coupled) to the inner surface of the bottom plate 16A at the right rear corner.

  Note that a surface (right side surface) facing the right side of the left holding rib 116 is a tapered surface 116A so that the support member 102 can be easily inserted. Further, the holding protrusion 112, the locking groove 114, and the holding ribs 116 and 118 serve as a coupling means 110 for coupling the support member 102 to the lower case 16.

  Further, as shown in FIGS. 2 and 3, a plurality of engagement gears 48 (equal intervals, for example, three at intervals of 120 degrees) are provided on the periphery of the upper surface of the bottom wall 28 of the reel hub 22 with a predetermined gap therebetween. A plurality of through holes 28 </ b> A (three in this case, at intervals of 120 degrees) are formed at predetermined positions on the reel gear 44 between the engaging gears 48. A disc-shaped braking member 80 formed of a resin material is inserted into the reel hub 22.

  A braking gear 84 that can mesh with the engaging gear 48 is formed in an annular shape on the periphery of the lower surface 80 </ b> A of the braking member 80. The upper surface of the braking member 80 faces downward from the inner surface of the top plate 14 </ b> A of the upper case 14. An engagement protrusion 86 having a substantially cross-shaped rotation restriction rib 76 that is protruded and inserted therein is erected so as to be slightly higher than the height of the rotation restriction rib 76. Yes. As a result, the braking member 80 is not rotatable with respect to the case 12 (upper case 14), and is movable in the vertical direction within the reel hub 22.

  A compression coil spring 98 is disposed between the upper case 14 and the braking member 80. That is, one end of the compression coil spring 98 abuts on the inner side (between the rotation restricting rib 76 and the annular protrusion 78) of the annular protrusion 78 provided on the outer side of the rotation restricting rib 76 of the upper case 14, and the other end is the braking member. 80 is arranged in contact with an annular groove 88 provided on the upper surface of 80. Due to the biasing force of the compression coil spring 98, the braking member 80 is constantly biased downward.

  Therefore, when the recording tape cartridge 10 is not in use (when not loaded in the drive device), the braking gear 84 is always meshed with the engagement gear 48 and the relative rotation of the reel 20 with respect to the case 12 is prevented. The rotation is locked. At this time, the reel 20 is pressed against the lower case 16 side by this urging force, and the reel gear 44 is exposed from the gear opening 40.

  Further, a release member 90 having a substantially equilateral triangular shape in a plan view formed of a resin material is inserted inside the reel hub 22 and below the braking member 80 (between the bottom wall 28 and the braking member 80). The The release member 90 is provided with a plurality of through holes 92 (three in the figure are hexagonal in the figure) formed in a predetermined shape at appropriate positions, so that the release member 90 is reduced in weight. . Further, leg portions 94 protruding from the lower surface of the bottom wall 28 to the reel gear 44 by a predetermined height are provided on the lower surface of each of the release members 90 and at the respective vertex portions.

  Further, a flat support convex portion 96 is formed at the center of the upper surface 90A of the release member 90, and a substantially hemispherical release protrusion 82 protruding from the center of the lower surface 80A of the braking member 80 comes into contact therewith. (See FIGS. 2 and 3). As a result, the contact area between the braking member 80 and the release member 90 is reduced, and the sliding resistance during use (during rotation of the reel 20) is reduced.

  Next, the security function added to the recording tape cartridge 10 in the recording tape cartridge 10 having the above configuration will be described. That is, in order to prevent the recording tape cartridge 10 from being carried out from a predetermined security area, the security recognition member provided in the case 12 of the recording tape cartridge 10, that is, the support provided with the amorphous magnetic wire 100 is provided. The member 102 will be described in more detail.

  As shown in FIGS. 6 and 7A, the support member 102 is, for example, an amorphous magnetic wire 100 having a diameter of 30 μm, which is kneaded in a resin material, and the horizontal direction is a longitudinal direction. The amorphous magnetic wire 100 is randomly arranged (embedded) inside the support member 102 (without being exposed from the support member 102).

  The amorphous magnetic wire 100 is a known wire and has the property of repeating magnetization reversal (large Barkhausen effect) in response to a low-intensity oscillating magnetic field. Therefore, by detecting a change in the magnetic field generated by the large Barkhausen effect, it is possible to notify that the recording tape cartridge 10 is carried out from a predetermined security area.

  More specifically, for example, a gate (not shown) having an excitation coil is disposed oppositely at the entrance and exit of a predetermined security area, and an oscillating magnetic field having an amplitude of a predetermined level or more is applied from the excitation coil. When the recording tape cartridge 10 passes through the gate, magnetization reversal occurs periodically in the amorphous magnetic wire 100 in the support member 102 provided in the case 12, and an electrical pulse accompanying the magnetization reversal is opposed to Detected by the arranged excitation coil (large Barkhausen effect is detected).

  Therefore, if the system is configured such that an alarm sound or the like is generated from the gate by this detection, the recording tape cartridge 10 can be prevented from being stolen or inadvertently taken out. It is known that the amorphous magnetic wire 100 has a higher sensitivity as the arrangement length is longer. Moreover, arrangement | positioning of the illustrated amorphous magnetic wire 100 is an example, and is not limited to this arrangement | positioning shape.

  The resin material constituting the support member 102 is preferably a thermoplastic resin material such as polycarbonate (PC), polyacetal (POM), polyethylene (PE), polystyrene (PS), polyamide (PA), and has strength and moldability. It is more preferable to use a polycarbonate (PC) having excellent resistance. The support member 102 may be configured to be fixed (coupled) to the lower case 16 by welding, but the support member 102 may be configured to be locked (coupled) to the lower case 16 by the claw portion 108 or the like. Desirable to be removable.

  Next, the operation of the recording tape cartridge 10 configured as described above will be described. The opening 18 of the recording tape cartridge 10 is closed by a door 50 when not in use (during storage or transportation). The braking member 80 is positioned at the rotation lock position by the urging force of the compression coil spring 98, and the braking gear 84 is engaged with the engaging gear 48. For this reason, the reel 20 is prevented from rotating with respect to the case 12.

  On the other hand, when the recording tape T is used, the recording tape cartridge 10 is loaded into the drive device along the arrow A direction with the front wall 12A at the head. Then, first, the opening / closing member provided on the drive device side engages with the convex portion 56 of the door 50. In this state, when the recording tape cartridge 10 further moves in the arrow A direction, the opening / closing member moves the projection 56 relatively rearward against the urging force of the coil spring 58. Then, the door 50 on which the convex portion 56 projects is slid rearward in the groove portion 64 along the right wall 12B to open the opening 18.

  Thus, when the recording tape cartridge 10 is loaded into the drive device at a predetermined depth and the opening 18 is completely opened, the recording tape cartridge 10 is lowered by a predetermined height, and the positioning member (not shown) of the drive device is moved to the lower case. 16 is inserted into a positioning hole (not shown) formed in 16. Thus, the recording tape cartridge 10 is accurately positioned at a predetermined position in the drive device, and further sliding (rearward movement) of the door 50 is restricted.

  Further, by the lowering operation of the recording tape cartridge 10, the rotating shaft relatively enters from the gear opening 40 and meshes the drive gear with the reel gear 44. Then, as the drive gear meshes with the reel gear 44, the leg portion 94 protruding on the reel gear 44 is pushed up against the urging force of the compression coil spring 98, and the braking member is interposed via the release member 90. 80 is pushed upward, and the meshing between the brake gear 84 and the engagement gear 48 is released.

  Then, in a state where the drive gear and the reel gear 44 are completely engaged, the reel plate 46 is attracted and held by the magnetic force of the annular magnet provided on the radially inner side of the drive gear, so that the reel 20 is driven. While the meshing of the reel gear 44 with the gear is maintained, the unlocked state in which the relative rotation with respect to the case 12 is possible is made in the case 12.

  On the other hand, a drawing member provided on the drive device side enters the case 12 from the opened opening 18 and grips and pulls out the leader pin 30 positioned and held by the pin holding portion 36. At this time, since the recording tape cartridge 10 is accurately positioned in the drive device, the drawing member can reliably engage the hook with the annular groove 32 of the leader pin 30. Further, since the rotation lock state of the reel 20 is released, the reel 20 can rotate as the leader pin 30 is pulled out.

  Thus, the leader pin 30 extracted from the opening 18 is accommodated in a take-up reel (not shown). Then, by rotating the take-up reel and the reel 20 synchronously, the recording tape T is sequentially drawn out from the case 12 while being taken up by the take-up reel, and is arranged along a predetermined tape path. Information is recorded or reproduced by a recording / reproducing head (not shown).

  When the recording tape cartridge 10 that has finished recording and reproducing information is ejected from the drive device, first, the recording tape T is rewound onto the reel 20 by the reverse rotation of the rotating shaft. When the recording tape T is rewound to the end of the reel 20 and the leader pin 30 is held by the pin holding portion 36, the recording tape cartridge 10 is raised by a predetermined height, and the positioning member is moved from the positioning hole. At the same time, the rotary shaft is extracted from the gear opening 40 and the engagement of the drive gear with the reel gear 44 is released.

  Then, the braking member 80 and the release member 90 are pressed downward by the urging force of the compression coil spring 98, the leg portion 94 is inserted into the through hole 28A, and the predetermined height from the lower surface of the bottom wall 28 onto the reel gear 44. The brake gear 84 meshes with the engagement gear 48 while projecting. As a result, the reel 20 is again in a rotation-locked state in which relative rotation in the case 12 is prevented, and then the recording tape cartridge 10 is moved in the direction opposite to the arrow A direction by an unillustrated ejecting mechanism.

  Then, with this movement, the door 50 slides in the closing direction of the opening 18 by the urging force of the coil spring 58 and completely closes the opening 18 (returns to the initial state). Thus, the relative rotation of the reel 20 with respect to the case 12 is locked, and the recording tape cartridge 10 with the opening 18 closed is completely ejected from the drive device.

  Here, when the recording tape cartridge 10 ejected from the drive device is carried out from a predetermined security area, an alarm sound is generated to prevent the carrying out. That is, a support member 102 including an amorphous magnetic wire 100 is provided in the recording tape cartridge 10, specifically, in the right rear corner portion in the case 12.

  Therefore, for example, when passing through a gate provided at the entrance / exit of the security area, a large Barkhausen effect occurs in the amorphous magnetic wire 100 due to an oscillating magnetic field applied from an excitation coil provided at the gate, and the large Barkhausen effect is generated. , Is detected by the exciting coil. Accordingly, an alarm sound is generated from the gate by the detection, and the recording tape cartridge 10 is psychologically prevented from being stolen or carelessly taken out.

  Since the support member 102 is a member provided in the case 12 to support the memory board M, a separate member for providing the amorphous magnetic wire 100 in the case 12 is not required. Therefore, a space for providing the amorphous magnetic wire 100 is not taken in the case 12, and the number of parts does not increase. Therefore, even if the amorphous magnetic wire 100 is provided, the manufacturing cost is low.

  Accordingly, on the inner surface of the bottom plate 16A at the right rear corner portion of the lower case 16, the holding protrusion 112, the holding ribs 116, 118, and the like that are large enough to hold (couple) the support member 102 are formed. Therefore, when the lower case 16 is injection-molded, the dimensional accuracy in the right rear corner can be improved.

  Further, since the memory board M is mounted in the recess 104 formed in the support member 102, the position thereof is not shifted. Therefore, it is not necessary to form a pressing member or the like for pressing the memory board M from above on the inner surface of the top plate 14A of the upper case 14. Since the amorphous magnetic wire 100 is included in the support member 102 that supports the memory board M, the amorphous magnetic wire 100 can be disposed in a state of being positioned with respect to the case 12.

  The support member 102 in which the amorphous magnetic wire 100 is included is configured to be detachable from the case 12. Therefore, for example, when the recording tape cartridge 10 is discarded, the support member 102 can be taken out from the case 12 and reused for another recording tape cartridge 10. Therefore, the manufacturing cost of the recording tape cartridge 10 can be reduced.

  Similarly, since the memory board M is also detachable from the support member 102, the memory board M can be taken out from the support member 102 taken out as described above and reused for another recording tape cartridge 10. it can. The memory board M is more expensive than the amorphous magnetic wire 100. Therefore, with such a configuration, the manufacturing cost of the recording tape cartridge 10 can be further reduced.

  Further, the support member 102 may be formed in a substantially right triangular tube shape as shown in FIG. In this case, there is a concern that the length of the encapsulating amorphous magnetic wire 100 is shorter than the substantially right triangular prism-shaped support member 102 shown in FIG. 7A, but the weight of the support member 102 and the manufacturing cost are reduced. There is an advantage that can be achieved.

  Further, the amorphous magnetic wire 100 is not limited to the configuration of being included (kneaded) in the support member 102. That is, for example, as shown in FIGS. 8A and 8B, the right side surface 102B and the inclined surface 102A (including the inside of the recess 104) of the support member 102 are attached with an adhesive such as glue. Also good.

  Although not shown, a cylindrical member including the amorphous magnetic wire 100 may be inserted into the screw boss 15 of the case 12 separately from the support member 102. In this case, since the amorphous magnetic wire 100 can be extended in the vertical direction, directivity in at least a two-dimensional direction (two directions orthogonal to each other) is obtained by combination with the support member 102 extending in the horizontal direction. It can be further lowered.

  Note that the amorphous magnetic wire 100 included in the support member 102 or the cylindrical member is preferably configured in a spiral shape (coil shape) if possible. According to this, since the amorphous magnetic wire 100 can be extended in a three-dimensional direction (three directions orthogonal to each other), the directivity can be further reduced.

  In other words, with such a configuration, even when the recording tape cartridge 10 is held in any posture, the large Barkhausen effect can be reliably detected and an alarm sound can be generated when it passes through the gate. . Thus, according to the present embodiment, a high-performance security function for theft prevention from the security area can be added to the recording tape cartridge 10 at low cost and without taking up space.

  As described above, the recording tape cartridge 10 according to the present embodiment has been described. However, the recording tape cartridge 10 according to the present embodiment is not limited to the illustrated example, and within a scope that does not depart from the gist of the present invention. The design can be changed as appropriate. The recording tape T wound around the reel 20 only needs to be grasped as a long tape-like information recording / reproducing medium capable of recording information and reproducing the recorded information, and accommodates the reel 20. Needless to say, the recording tape cartridge 10 can be applied to the recording tape T of any recording / reproducing system.

10 Recording Tape Cartridge 12 Case 18 Opening 20 Reel 30 Leader Pin (Leader Member)
DESCRIPTION OF SYMBOLS 50 Door 80 Braking member 90 Release member 100 Amorphous magnetic wire 102 Support member 102A Slope 104 Recessed part 105 Overhang part 106 Overhang part 108 Claw part 110 Coupling means 112 Holding protrusion 114 Locking groove (locking part)
116 holding rib 118 holding rib M memory board T recording tape

Claims (3)

A case that accommodates a single reel on which a recording tape is wound; and
A leader member provided at an end of the recording tape and drawn from an opening formed in the case;
A non-contact type memory board storing various types of information is formed of a resin material in the shape of a substantially right triangular prism with a slope or a substantially right triangular cylinder, and an amorphous magnetic wire with a large Barkhausen effect is provided. A support member coupled by coupling means in the case;
A recording tape cartridge comprising: The coupling means includes
A claw portion formed at a substantially right angle portion of the support member;
A locking portion formed on the case and locking the claw portion;
Have
The recording tape cartridge according to claim 1, wherein the support member is configured to be detachable from the case.   The recording tape cartridge according to claim 1, wherein the memory board is configured to be detachable from the support member.

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