JP2010211873A - Recording tape cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reel with an anti-theft security function without requiring space. <P>SOLUTION: The recording tape cartridge 10 includes: a substantially rectangular case 12 for housing a reel 20 with a recording tape T wound thereon; a leader member 30 disposed at the end of the recording tape T to be pulled out from an opening 18 formed in the case 12; housing recesses 102, 104 and 106 formed in at least three 16A, 12A and 12C of wall parts of the case 12, the three wall part being set in different directions; an amorphous magnetic wire 100 with large Barkhausen effect housed in the housing recesses 102, 104 and 106; and cap members 112, 114 and 116 attached to the wall parts 16A, 12A and 12C where the housing recesses 102, 104 and 106 are formed to close the housing recesses 102, 104 and 106. <P>COPYRIGHT: (C)2010,JPO&INPIT

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 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, an alarm sound is generated from a gate or the like provided at the entrance / exit of the security area, and the recording tape cartridge A system for preventing theft of a user has been proposed (see, for example, Patent Document 1).

JP 2004-127349 A

  However, when the security tag is provided on the recording tape cartridge, there is less freedom in the part where the security tag is provided in the case of the recording tape cartridge, which makes it difficult to use with a highly directional security tag. There is. In other words, since the space in the case of the recording tape cartridge is limited, there is a problem that the shape and arrangement direction of the security tag are restricted.

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a recording tape cartridge that can be added with a security function for preventing theft with low directivity without taking up space.

  In order to achieve the above object, a recording tape cartridge according to claim 1 of the present invention includes a substantially rectangular case that accommodates a single reel on which the recording tape is wound, and an end of the recording tape. A leader member drawn out from an opening formed in the case, an accommodation recess formed in at least three wall portions facing different directions among the walls constituting the case, and the interior of the accommodation recess And an amorphous magnetic wire having a large Barkhausen effect, and a lid member attached to the wall portion in which the housing recess is formed so as to close the housing recess.

  According to the first aspect of the present invention, the amorphous magnetic wire having a large Barkhausen effect is accommodated in the accommodating recesses formed in at least three wall portions facing different directions among the wall portions constituting the case. In addition, since the storage recess is closed by the lid member, a security function for preventing theft is added, so that a space for providing the amorphous magnetic wire is not taken up separately. In addition, since the amorphous magnetic wires are provided on at least three wall portions facing different directions, the directivity can be lowered.

  According to a second aspect of the present invention, there is provided a recording tape cartridge according to the first aspect, wherein the amorphous magnetic wire is affixed and accommodated in the concave portion of the accommodating portion.

  According to invention of Claim 2, the shape of an amorphous magnetic wire does not collapse. Therefore, the directivity can be further reduced.

  The recording tape cartridge according to claim 3 is the recording tape cartridge according to claim 1, wherein the amorphous magnetic wire is attached to the lid member, and the lid member closes the housing recess. , And is housed in the housing recess.

  According to invention of Claim 3, the shape of an amorphous magnetic wire does not collapse. Therefore, the directivity can be further reduced. Moreover, since an amorphous magnetic wire is affixed on a cover member, the manufacturing process can be simplified. Therefore, even if it is a structure provided with an amorphous magnetic wire, it can suppress that the manufacturing cost of a recording tape cartridge increases.

  According to a fourth aspect of the present invention, there is provided a recording tape cartridge according to the present invention, wherein the recording tape cartridge is provided at a case of a substantially rectangular shape that houses a single reel on which the recording tape is wound, and an end of the recording tape. A leader member drawn from the opening formed in the plate, a resin plate containing an amorphous magnetic wire having a large Barkhausen effect, and three walls facing at least different directions among the wall portions constituting the case And an accommodating recess formed in the portion for accommodating the plate.

  According to invention of Claim 4, the amorphous magnetic wire provided with the large Barkhausen effect is included in the accommodation recessed part formed in the wall part which comprises a case at least in three wall parts which face a different direction. Since the resin plate is accommodated, a security function for theft prevention is added, so that a space for providing the amorphous magnetic wire is not taken up separately. In addition, since the amorphous magnetic wires are provided on at least three wall portions facing different directions, the directivity can be lowered.

  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 with low directivity can be added 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 plan view showing the lower case in which the amorphous magnetic wire is housed in the housing recess The schematic perspective view which shows the lower case in which the amorphous magnetic wire was accommodated in the accommodation recessed part Schematic side sectional view showing a housing recess and a lid member in which an amorphous magnetic wire is housed Schematic bottom view showing a lid member with an amorphous magnetic wire attached Schematic side cross-sectional view showing a lid member to which an amorphous magnetic wire is attached and a housing recess Schematic side sectional view showing a lid member (plate) containing an amorphous magnetic wire and a housing recess

  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 FIG. 2, a memory board M storing various information such as recording capacity and recording format is arranged at a predetermined inclination angle at the right rear corner of the case 12.

  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. In other words, in order to prevent the recording tape cartridge 10 from being carried out from a predetermined security area, at least different directions in the case 12 of the recording tape cartridge 10, specifically, the wall portion constituting the case 12, are arranged. The amorphous magnetic wire 100 provided (accommodated) in three facing wall portions (for example, the bottom plate 16A, the front wall 12A, and the left wall 12C) will be described.

  The amorphous magnetic wire 100 is a known wire having a diameter of, for example, 30 μm, and has a 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, as shown in FIGS. 2 to 6, the reel area surrounded by the play regulating wall 42 and the peripheral wall 16 </ b> B on the inner surface of the bottom plate 16 </ b> A of the lower case 16 has an annular predetermined depth. Are formed in the inner surface of the front peripheral wall 16B (front wall 12A) of the lower case 16 and the inner surface of the left peripheral wall 16B (left wall 12C). Has been.

  A stepped portion 102A is formed at the peripheral portion of the housing recess 102, and a lid member 112 formed of a resin material into an annular flat plate shape is fitted and welded (fixed) to the stepped portion 102A (attachment). The housing recess 102 is closed (sealed) by the lid member 112.

  At this time, the outer surface of the lid member 112 that closes the housing recess 102 is configured to be flush with the inner surface of the bottom plate 16 </ b> A of the lower case 16. That is, the depth of the stepped portion 102 </ b> A is equal to the thickness of the lid member 112, and the lid member 112 does not protrude from the inner surface of the bottom plate 16 </ b> A of the lower case 16.

  Similarly, stepped portions 104A and 106A are formed at the peripheral portions of the housing recesses 104 and 106, respectively, and lid members 114 and 116 formed of a resin material in a rectangular flat plate shape are formed on the stepped portions 104A and 106A. The housing recesses 104 and 106 are closed (sealed) by the lid members 114 and 116 by being fitted and welded (fixed) (attached).

  At this time, the outer surfaces of the lid members 114 and 116 closing the housing recesses 104 and 106 are configured to be flush with the inner surface of the peripheral wall 16B of the lower case 16. That is, the depth of each step 104A, 106A is equal to the thickness of each lid member 114, 116, and each lid member 114, 116 does not protrude from the inner surface of the peripheral wall 16B of the lower case 16. .

  Further, as shown in FIG. 6, an adhesive layer 108 such as glue is formed on the bottom surface of each of the receiving recesses 102, 104, 106 closed by the lid members 112, 114, 116, and the amorphous magnetic wire 100 is housed in each housing recess 102, 104, 106 in a state where 100 is stuck and fixed by the adhesive layer 108.

  That is, the amorphous magnetic wire 100 is attached in a state of being wound in a spiral shape of, for example, one or more rounds in the housing recess 102 formed in the bottom plate 16A of the lower case 16, and the peripheral wall 16B ( In the housing recesses 104 and 106 formed in the front wall 12A and the left wall 12C), the amorphous magnetic wire 100 is attached in, for example, a wave shape (may be wound in a spiral shape).

  Therefore, when a gate (not shown) having an excitation coil, for example, is arranged oppositely at the entrance / 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, the gate When the recording tape cartridge 10 passes, magnetization reversal occurs periodically in the amorphous magnetic wire 100 provided in the case 12 (lower case 16), and an electrical pulse accompanying the magnetization reversal is excited so as to be opposed. It is detected by a coil (a 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. The illustrated amorphous magnetic wire 100 is drawn with exaggerated thicknesses and intervals for easy understanding. Further, it is known that the amorphous magnetic wire 100 has a higher sensitivity as the arrangement length is longer.

  Therefore, as described above, it is desirable that the amorphous magnetic wire 100 be arranged in a spiral shape or a wave shape of one or more rounds (if possible, five or more rounds). Specifically, it is desirably 25 mm or more, and more desirably 100 mm or more. Incidentally, when the amorphous magnetic wire 100 is arranged in a spiral shape of one or more turns in the reel area, the length becomes 100 mm or more.

  The amorphous magnetic wire 100 is desirably provided in at least three wall portions orthogonal to each other, for example, in the bottom plate 16A, the front wall 12A, and the left wall 12C as described above. Thereby, since the amorphous magnetic wire 100 can be extended in a three-dimensional direction (three directions orthogonal to each other), the directivity can be lowered. That is, no matter what posture the recording tape cartridge 10 is held in, when passing through the gate, the large Barkhausen effect is detected and an alarm sound can be generated.

  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, the amorphous magnetic wire 100 is placed in the recording tape cartridge 10, specifically, in the receiving recesses 102, 104, 106 formed in the bottom plate 16 A and the peripheral wall 16 B (front wall 12 A and left wall 12 C) of the lower case 16. The storage recesses 102, 104, 106 are closed (sealed) by the lid members 112, 114, 116.

  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.

  In addition, the amorphous magnetic wire 100 is formed on the bottom surfaces of the storage recesses 102, 104, and 106 formed in the bottom plate 16A, the front wall 12A, and the left wall 12C, which are three wall portions that are orthogonal to each other (at least in different directions). Since it is affixed and fixed, and its vortex or wavy shape does not collapse, its directivity is lower. Therefore, it is possible to reliably detect the recording tape cartridge 10 being taken out from the security area.

  In addition, the amorphous magnetic wire 100 is welded (fixed) to the stepped portions 102A, 104A, 106A of the storage recesses 102, 104, 106 at the inner peripheral sides of the lid members 112, 114, 116. The recording tape cartridge 10 (case 12) is disassembled and cannot be visually recognized even if it is disassembled.

  Therefore, as compared with the configuration arranged in the case 12 (visible) like the security tag of the prior art, there is no possibility that the security function is illegally removed, and a record in which important data is recorded. The theft of the tape cartridge 10 can be reliably prevented.

  The amorphous magnetic wire 100 is provided within the thickness of the bottom plate 16A and the peripheral wall 16B (the front wall 12A and the left wall 12C) of the lower case 16 (the lid members 112, 114, and 116 are located on the inner side of the case 12). Therefore, a space for providing the amorphous magnetic wire 100 is not taken up separately. Therefore, a high-performance security function for preventing theft from the security area can be added to the recording tape cartridge 10 without taking a special space.

  The amorphous magnetic wire 100 is not limited to the configuration in which the amorphous magnetic wire 100 is pasted and fixed to the bottom surfaces of the storage recesses 102, 104, and 106. For example, after the amorphous magnetic wire 100 is pasted and fixed to the inner surfaces of the lid members 112, 114, and 116, The lids 112, 114, and 116 close the recesses 102, 104, and 106 so that the amorphous magnetic wire 100 is accommodated in the accommodation recesses 102, 104, and 106.

  That is, for example, as shown in FIG. 7 and FIG. 8, an adhesive layer 110 such as glue is formed on the inner surface of each lid member 112, 114, 116, and the amorphous magnetic wire 100 is spirally formed by the adhesive layer 110. Paste in a wavy pattern. Then, by welding (adhering) the peripheral edge portions of the lid members 112, 114, and 116 to which the amorphous magnetic wire 100 is attached to the step portions 102A, 104A, and 106A of the accommodating recesses 102, 104, and 106, The amorphous magnetic wire 100 may be sealed in the bottom plate 16A of the lower case 16 and the peripheral wall 16B (the front wall 12A and the left wall 12C).

  Also in this case, the amorphous magnetic wire 100 is provided on the bottom plate 16A, the front wall 12A, and the left wall 12C which are three wall portions orthogonal to each other (at least in different directions). Since the shape does not collapse, its directivity is lower. Therefore, it is possible to reliably detect the recording tape cartridge 10 being taken out from the security area.

  Further, since the amorphous magnetic wire 100 is configured to be affixed to the lid members 112, 114, and 116 that are members different from the case 12, the manufacturing process is simplified as compared with the configuration affixed to the case 12. Can do. Therefore, even if the amorphous magnetic wire 100 is configured to be provided on three wall portions facing at least different directions (perpendicular to each other), an increase in the manufacturing cost of the recording tape cartridge 10 can be suppressed.

  Still further, the amorphous magnetic wire 100 is not attached to the bottom surface of each housing recess 102, 104, 106 with the adhesive layer 108, or attached to the inner surface of each lid member 112, 114, 116 with the adhesive layer 110, not illustrated. The amorphous magnetic wire 100 is pasted in a spiral or wave shape on the adhesive sheet that is not, and the adhesive sheet on which the amorphous magnetic wire 100 is pasted is pasted on the bottom surface of each housing recess 102, 104, 106, or each lid member 112, It is good also as a structure stuck on the inner surface of 114,116.

  Further, the amorphous magnetic wire 100 may be included (embedded) in each of the lid members 112, 114, and 116, instead of being attached to each of the housing recesses 102, 104, and 106 and the lid members 112, 114, and 116. That is, each lid member 112, 114, 116 may be manufactured by injection molding with a resin material in which the amorphous magnetic wire 100 is kneaded (mixed).

  In this case, the shape of the amorphous magnetic wire 100 in each of the lid members 112, 114, and 116 is random, but similarly to the above, the bottom plate 16A, which is at least three wall portions that face in different directions (orthogonal to each other), Since the amorphous magnetic wire 100 can be disposed on the front wall 12A and the left wall 12C, the directivity can be lowered. Therefore, a high-performance security function for preventing theft from the security area can be added to the recording tape cartridge 10 without taking a special space.

  In addition, such a configuration has an advantage that the stepped portions 102A, 104A, and 106A need not be formed in the peripheral portions of the respective housing recesses 102, 104, and 106, as shown in FIG. That is, in this case, the depth of each of the receiving recesses 102, 104, 106 may be equal to the thickness of each of the lid members 112, 114, 116 as a plate according to the present invention. Each lid member 112, 114, 116 can be easily welded (fixed) to 106.

  In addition, the pressure-sensitive adhesive sheet to which the amorphous magnetic wire 100 is attached is attached to a mold (not shown) that forms each lid member 112, 114, 116 (or the lower case 16), and then the metal The amorphous magnetic wire 100 may be fixed to the resin material (embedded in the lid members 112, 114, and 116) in the process of pouring the molten resin material into the mold and solidifying the molten resin material.

  In this case, the pressure-sensitive adhesive sheet is desirably composed of, for example, polyethylene (PE), polyethylene terephthalate (PET), polycarbonate (PC), or the like so that the pressure-sensitive adhesive sheet melts depending on the temperature of the molten resin material. Thus, it is desirable to form the thickness as thin as possible. Further, it is desirable that the adhesive strength is relatively weak so that the adhesive sheet is embedded in each lid member 112, 114, 116 (so as not to be exposed to the surface).

  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. For example, the three housing recesses 102, 104, and 106 that house the amorphous magnetic wire 100 may be formed to include the play regulating wall 42, the door 50, etc. as well as the upper case 14.

  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 12A Front wall (wall)
12B right wall 12C left wall (wall)
14 Upper case 14A Top plate 14B Perimeter wall 16 Lower case 16A Bottom plate (wall)
16B Perimeter wall 18 Opening 20 Reel 30 Leader pin (leader member)
50 Door 80 Braking member 90 Release member 100 Amorphous magnetic wire 102 Housing recess 104 Housing recess 106 Housing recess 108 Adhesive layer 110 Adhesive layer 112 Lid member (plate)
114 Lid member (plate)
116 Lid member (plate)
T Recording tape

Claims (4)

A substantially rectangular case that houses a single reel on which a recording tape is wound;
A leader member provided at an end of the recording tape and drawn from an opening formed in the case;
An accommodation recess formed in at least three wall portions facing different directions among the wall portions constituting the case;
An amorphous magnetic wire with a large Barkhausen effect housed in the housing recess;
A lid member attached to the wall portion where the housing recess is formed so as to close the housing recess;
A recording tape cartridge comprising:   The recording tape cartridge according to claim 1, wherein the amorphous magnetic wire is affixed and accommodated in the recess of the accommodating portion.   The recording tape cartridge according to claim 1, wherein the amorphous magnetic wire is affixed to the lid member, and the lid member closes the accommodation recess to be accommodated in the accommodation recess. A substantially rectangular case that houses a single reel on which a recording tape is wound;
A leader member provided at an end of the recording tape and drawn from an opening formed in the case;
A resin plate containing an amorphous magnetic wire with a large Barkhausen effect;
An accommodation recess formed in at least three wall portions facing different directions among the wall portions constituting the case;
A recording tape cartridge comprising:

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