JP4879851B2 - Recording tape cartridge - Google Patents

Description

  The present invention relates to a recording tape cartridge in which a recording tape such as a magnetic tape mainly used as a recording / reproducing medium for a computer or the like is accommodated in a case.

  Conventionally, a recording tape such as a magnetic tape used as a data recording / reproducing medium (data backup) of a computer or the like is wound around a synthetic resin reel, and the reel is accommodated in a synthetic resin case as a single unit. A recording tape cartridge is known. The case of this recording tape cartridge is mainly configured by joining an upper case and a lower case of a substantially rectangular tray shape by welding, screwing or the like.

In the case where the upper case and the lower case are joined by screws, screw bosses that are in contact with each other (abutted against each other) are erected in the vicinity of the corners of the upper case and the lower case. A screw is screwed into the screw boss from the lower surface (bottom surface) side, and the upper case and the lower case are joined (for example, refer to Patent Document 1).
JP-A-11-339436

  However, in the case where the upper case and the lower case are joined by screws, the contact position (hole position) between the upper case screw boss and the lower case screw boss due to errors in molding the upper case and the lower case. When the screws are screwed in this state, the assembled case may be distorted due to the displacement of the screw bosses. In particular, if the inner wall constituting the rotation area of the reel is deformed thereby, the rotation of the reel may be adversely affected.

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to obtain a recording tape cartridge that can accommodate a reel in a rotatable manner and can suppress distortion of a case joined by screws.

In order to achieve the above object, the recording tape cartridge according to claim 1 of the present invention comprises an upper case having a peripheral wall erected on a top plate and a lower case having a peripheral wall erected on a bottom plate , A substantially rectangular case that rotatably accommodates a reel on which a recording tape is wound, a first inner wall that is formed on the top plate and forms a rotation area of the reel, and is formed on the bottom plate , From the second inner wall that opposes the first inner wall and that constitutes the rotation area of the reel, a plurality of first screw bosses projecting from the top plate on the outer side of the first inner wall, and the second inner wall A plurality of second screw bosses provided on the bottom plate on the outer side so as to be able to abut against the first screw bosses, the first screw boss and the rotation center of the reel in bottom view. one of said first inner wall on the virtual line connecting When the protrusion is formed on the other one to form a recess on either a portion of the second inner wall on the virtual straight line in plan view connecting the rotational center of the reel and said second screw boss, the When the upper case and the lower case are joined, the convex portion comes into contact with the concave portion.

According to the first aspect of the present invention, when the upper case and the lower case are joined, the screw bosses are displaced by the displacement of the screw bosses due to molding errors of the upper case and the lower case or by the tightening torque at the time of screwing. Even if buckling (compression deformation) occurs, any of the recesses formed on one of the first inner wall and the second inner wall on the imaginary straight line connecting the screw boss and the rotation center of the reel Since the convex part formed in the other abuts, the deformation near the screw boss can be suppressed by the first inner wall and the second inner wall .

Therefore, distortion of the case, in particular, deformation of the first inner wall and the second inner wall constituting the reel rotation area can be suppressed .

Further, in the recording tape cartridge according to claim 2, in the recording tape cartridge according to claim 1, the abutting height of the convex portion with respect to the concave portion is the same as the abutting height of the screw boss. It is characterized by .

According to the second aspect of the present invention, it is possible to suppress the screw boss from buckling (compressing deformation) by the tightening torque at the time of screwing.

Therefore, further it is possible to suppress distortion of the case, the deformation of the first inner wall and second inner wall constituting the rotating area of the reel can be further suppressed.

According to a third aspect of the present invention , in the recording tape cartridge according to the first or second aspect , at least four sets of the concave portion and the convex portion are formed.

According to the invention described in claim 3 , since the distortion of the case can be further suppressed, the deformation of the first inner wall and the second inner wall constituting the rotation area of the reel can be suppressed and further prevented. .

  As described above, according to the present invention, it is possible to provide a recording tape cartridge in which a reel is rotatably accommodated and distortion of a case joined by screws is suppressed.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the present invention will be described below in detail based on the embodiments 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.

  As shown in FIGS. 1 to 5, 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 to each other by screws.

  That is, the non-penetrating screw bosses (first screw bosses) 15 and the outer side in the radial direction (outer side) of the upper inner wall 42 and the lower inner wall 44 described later of the upper case 14 and the lower case 16 and in the vicinity of each corner portion, Through screw bosses (second boss bosses) 17 are projected (four in total), and screws (not shown) are screwed into the boss bosses 17 and boss bosses 15 from the lower surface side of the lower case 16. The case 12 is assembled (the upper case 14 and the lower case 16 are joined).

  As shown in detail in FIG. 9, the upper inner peripheral edge portion 17 </ b> A of the screw boss 17 of the lower case 16 protrudes in an annular shape, and when the upper case 14 and the lower case 16 are joined, the upper case 14. The lower inner peripheral edge portion 15A of the screw boss 15 is in contact with (abutted against) the upper inner peripheral edge portion 17A. The screw bosses 15 and 17 are not limited to those shown in the figure, and for example, as a so-called stamping structure in which the lower peripheral edge of the lower surface of the screw boss 15 is annularly raised and fitted to the upper peripheral edge 17A of the upper surface of the screw boss 17. Also good.

  Inside 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 47 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 47 to the outside is formed in the central portion of the lower case 16. 40 is drilled. The reel gear 47 exposed from the gear opening 40 is meshed with the drive gear 102 formed on the rotary shaft 100 of the drive device and is driven to rotate, so that the reel 20 is relative to the case 12 in the case 12. It can be rotated (see FIGS. 4 and 5).

  A reel plate 46, which is an annular metal plate made of a magnetic material, is coaxially and integrally fixed to the inner side in the radial direction of the reel gear 47 on the lower surface of the bottom wall 28 by insert molding. The reel plate 46 is attracted and held by the magnetic force of an annular magnet (not shown) provided on the rotary shaft 100 of the drive device.

  Further, when not in use (when not loaded in the drive device), the reel 20 is partially projected from the inner surface of the upper case 14 and is on a circular locus coaxial with an annular protrusion 78 described later. The upper inner wall 42 as the first inner wall and the inner surface of the lower case 16 are partially protruded and are not rattled by the lower inner wall 44 as the second inner wall on a circular locus coaxial with the gear opening 40. So that it is held. In use (when loaded in the drive device), the upper inner wall 42 and the lower inner wall 44 constitute a rotation area of the reel 20. The upper inner wall 42 and the lower inner wall 44 will be described in detail later.

  The right wall 12B of the case 12 is formed with an opening 18 for pulling out the recording tape T wound around the reel 20, and a free end portion of the recording tape T drawn out from the opening 18 is provided with a drive device. A leader pin 30 that is pulled out while being locked (engaged) by a drawing member (not shown) is fixed. An annular groove 32 is formed at both ends of the leader pin 30 projecting from the widthwise end of the recording tape T, and the annular groove 32 is locked to a hook or the like of the drawing member. Thereby, when the recording tape T is pulled out, the hook or the like does not come into contact with the recording tape T to be damaged.

  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 portion 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, which is set to enable / disable recording on the recording tape T, is provided at the left rear portion of the case 12 so as to be slidable in the left-right direction. An opening 68 is formed in the rear wall for projecting an operation projection 72 for manually operating the write protect 70. 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.

  Furthermore, the lower case 16 is provided with a long hole 69 that exposes the protrusion 74 of the write protect 70 in the left-right direction, and when the recording tape cartridge 10 is loaded in the drive device, the drive The position of the write protect 70 is detected on the apparatus side, and it is automatically determined whether or not recording on the recording tape T is possible. The protrusion 74 does not protrude from the lower surface of the lower case 16.

  In addition, as shown in FIG. 2, a plurality of engagement gears 48, each set having two sets, are spaced apart from each other at equal intervals (for example, at intervals of 120 degrees) on the periphery of the upper surface of the bottom wall 28 of the reel hub 22. A plurality of through holes 28A (in this case, three at intervals of 120 degrees) are formed at predetermined positions on the reel gear 47 between the engaging gears 48. . On the inner peripheral surface of the reel hub 22, a plurality of standing ribs 23 whose vertical direction is the longitudinal direction are formed at equal intervals.

  In addition, a disc-shaped braking member 80 formed of a resin material is provided inside the reel hub 22. As shown in FIGS. 2 and 3, a brake gear 84 that can mesh with the engagement gear 48 is formed in an annular shape on the periphery of the lower surface 80 </ b> A of the brake member 80, and the upper case 14 is formed on the upper surface of the brake member 80. An engagement protrusion 86 having a substantially cross-like shape in plan view, which is inserted downwardly from the inner surface of the top plate 14 </ b> A so as to protrude downward from the inner surface of the top plate 14 </ b> A, is formed from the height of the rotation-controlling rib 76. Is also set up to be slightly higher. 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. At that time, the braking member 80 is restricted from moving in the radial direction by the standing rib 23.

  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 47 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 provided inside the reel hub 22 and below the braking member 80 (between the bottom wall 28 and the braking member 80). 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, 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 (when the reel 20 rotates) is reduced.

  For example, polyacetal (POM) is used as the material of the braking member 80, and polybutylene terephthalate (PBT) is used as the material of the release member 90, for example. Further, on the lower surface of the release member 90 and at each apex portion, a leg portion 94 that protrudes from the lower surface (outer surface) of the bottom wall 28 to the reel gear 47 by a predetermined height is inserted. .

  Next, the configuration of the upper inner wall 42 and the lower inner wall 44 will be described in detail. As shown in FIGS. 4 to 8, the outer peripheral surface side of the upper inner wall 42 from the center in the thickness direction is an engaging portion 42 </ b> A that protrudes downward (on the lower inner wall 44 side). The inner peripheral surface side from the center in the plate thickness direction is an engaging portion 44A that protrudes upward (upper inner wall 42 side).

  Therefore, when the upper case 14 and the lower case 16 are joined, as shown in FIGS. 4 and 5, the inner peripheral surface of the engaging portion 42A and the outer peripheral surface of the engaging portion 44A are in the plate thickness direction (diameter of the reel 20). The front end surface of the engaging portion 42A and the front end surface of the engaging portion 44A are not so high as to contact the lower inner wall 44 and the upper inner wall 42 in the height direction (vertical direction), respectively. It is prescribed.

  On the other hand, as shown in FIG. 6, a part (width E) of the outer peripheral surface side (engagement portion 42 </ b> A side) of the upper inner wall 42 on the virtual straight line K connecting each screw boss 15 and the rotation center O of the reel 20 in the bottom view. In the predetermined region), a concave portion 43 having a “concave” shape in a side view is formed (see FIG. 8). Similarly, as shown in FIG. 7, a part of the outer peripheral surface side of the lower inner wall 44 on the virtual straight line K connecting each screw boss 17 and the rotation center O of the reel 20 in a plan view (a predetermined width E). In the region, a convex portion 45 having a “convex” shape in a side view is formed (see FIG. 8).

  As shown in FIG. 9, the concave portion 43 and the convex portion 45 are deep so that they contact (but abut) in the height direction (vertical direction) when the upper case 14 and the lower case 16 are joined. The height and height are specified. That is, as shown in FIG. 8, the convex portion 45 is configured to have a height higher than that of the engaging portion 44A, and the depth of the concave portion 43 is determined accordingly.

  As shown in FIG. 9, the height of the convex portion 45 is the same height as the abutting height of the screw boss 15 and the screw boss 17 when the upper case 14 and the lower case 16 are joined. As shown in FIGS. 6 and 7, it is desirable that at least four concave portions 43 and convex portions 45 are formed in the vicinity of the screw bosses 15 and 17, respectively. Moreover, although the width E of the recessed part 43 and the convex part 45 of illustration is the same as the diameter of the screw bosses 15 and 17, it is not limited to this, For example, even if it forms in width E larger than it I do not care.

  Next, the operation of the recording tape cartridge 10 configured as described above will be described with reference to FIGS. In the recording tape cartridge 10, the opening 18 is closed by the door 50 when not in use (for storage or transport). 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. Further, the release member 90 has a leg portion 94 protruding from the through hole 28 </ b> A on the reel gear 47 to the lower surface (outer surface) side of the bottom wall 28.

  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 rotary shaft 100 relatively enters from the gear opening 40 and meshes the drive gear 102 with the reel gear 47. Then, as the drive gear 102 engages with the reel gear 47, the leg portion 94 protruding on the reel gear 47 is pushed up against the urging force of the compression coil spring 98 and is braked via the release member 90. The member 80 is pushed upward, and the meshing between the brake gear 84 and the engagement gear 48 is released.

  Thus, the engagement between the brake gear 84 and the engagement gear 48 is completely released, and the reel plate 46 is provided on the radially inner side of the drive gear 102 in a state where the drive gear 102 and the reel gear 47 are completely engaged. By being attracted and held by the magnetic force of the annular magnet, the reel 20 is unlocked so that it can rotate relative to the case 12 in the case 12 while maintaining the meshing of the reel gear 47 with the drive gear 102. It is said.

  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 shaft T is rewound onto the reel 20 by the reverse rotation of the rotary shaft 100. 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 100 is extracted from the gear opening 40 and the meshing of the drive gear 102 with the reel gear 47 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, and the leg portion 94 is inserted into the through hole 28 </ b> A so as to be placed on the reel gear 47 from the lower surface (outer surface) of the bottom wall 28. The brake gear 84 meshes with the engagement gear 48 while projecting a predetermined amount. 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, the operation of the upper inner wall 42 in which the concave portion 43 is formed and the lower inner wall 44 in which the convex portion 45 is formed will be described. The upper case 14 having the upper inner wall 42 having the above structure and the lower case 16 having the lower inner wall 44 having the above structure are brought into contact with the screw boss 15 and the screw boss 17, and screws (not shown) are screwed from the lower surface side of the bottom plate 16A. When joined together, as shown in FIGS. 4 and 5, the inner peripheral surface of the engaging portion 42A and the outer peripheral surface of the engaging portion 44A are in contact with each other in the plate thickness direction (the radial direction of the reel 20). 9. As shown in FIG. 10, the convex portion 45 abuts (contacts) the concave portion 43 in the height direction (vertical direction).

  Therefore, even if the screw bosses 15 and 17 are buckled (compressed and deformed) due to the displacement of the screw bosses 15 and 17 due to molding errors of the upper case 14 and the lower case 16 and the tightening torque at the time of screwing, The deformation (distortion) of the case 12 in the vicinity of the screw bosses 15 and 17 can be suppressed by the abutting portions (the concave portion 43 and the convex portion 45) of the upper inner wall 42 and the lower inner wall 44. Thus, the deformation of the upper inner wall 42 and the lower inner wall 44 can also be suppressed, and the deformation in the rotation area of the reel 20 constituted by the upper inner wall 42 and the lower inner wall 44 can be suppressed. The rotation of the can be prevented from being adversely affected.

  Further, if the abutting height (contact height) of the convex portion 45 with respect to the concave portion 43 is the same as the abutting height (contact height) of the screw boss 15 and the screw boss 17, The buckling (compression deformation) itself of the screw boss 15 and the screw boss 17 by the tightening torque can be suppressed by the abutting portions (the concave portion 43 and the convex portion 45) of the upper inner wall 42 and the lower inner wall 44. Therefore, the distortion of the entire case 12 can be further suppressed (the planarity of the entire case 12 can be improved).

  The concave portion 43 and the convex portion 45 are formed in other portions of the upper inner wall 42 and the lower inner wall 44 (portions other than a predetermined region on the virtual straight line K connecting the screw bosses 15 and 17 and the rotation center O of the reel 20). May be. However, the concave portion 43 and the convex portion 45 are formed at least in the vicinity of the screw bosses 15 and 17, that is, in a predetermined region on the virtual straight line K connecting the screw bosses 15 and 17 and the rotation center O of the reel 20 (four sets). If so, the deformation of the upper inner wall 42 and the lower inner wall 44 constituting the rotation area of the reel 20 can be suppressed or prevented, and the distortion of the entire case 12 can be further suppressed (the flatness of the entire case 12 can be reduced). Can be further improved).

  As described above, when the concave portion 43 is formed on the upper inner wall 42 of the upper case 14 and the convex portion 45 is formed on the lower inner wall 44 of the lower case 16, and the upper case 14 and the lower case 16 are joined. Since the convex portion 45 abuts (buts against) the concave portion 43 in the height direction (vertical direction), even if the screw bosses 15 and 17 are buckled (compressed and deformed) by the tightening torque, the rotation area of the reel 20 It is possible to suppress or prevent the deformation of the upper inner wall 42 and the lower inner wall 44 constituting the.

  In addition, you may form the recessed part 43 and the convex part 45 upside down. That is, the convex portion 45 may be formed on the upper inner wall 42 and the concave portion 43 may be formed on the lower inner wall 44. In this case also, it is desirable that the abutting height of the convex portion 45 with respect to the concave portion 43 is the same as the abutting height of the screw bosses 15 and 17. Further, the upper inner wall 42 and the lower inner wall 44 do not have to be formed with the engaging portions 42A and 44A, respectively. That is, the above effect can be obtained as long as at least the concave portion 43 and the convex portion 45 are formed.

  In the recording tape cartridge 10 of the above embodiment, the leader pin 30 is provided as a leader member. However, the recording tape cartridge 10 is not limited to the above embodiment, and for example, a leader tape (not shown) is used as the leader member. (Omitted). Further, the recording tape T only needs to be grasped as a long tape-like information recording / reproducing medium capable of recording information and reproducing the recorded information, and the recording tape cartridge 10 according to the present invention can perform any recording. Needless to say, the present invention can also be applied to a recording tape T of a reproducing system.

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 sectional view when the reel of the recording tape cartridge is in the rotation lock position Schematic cross-sectional view when the reel of the recording tape cartridge is at the rotation allowable position Schematic bottom view of the upper case Schematic plan view of the lower case Schematic perspective view showing the configuration of the upper and lower inner walls Explanatory drawing which shows the state of the upper inner wall and lower inner wall when an upper case and a lower case are joined Schematic cross-sectional view taken along line XX in FIG.

Explanation of symbols

10 recording tape cartridge 12 case 14 upper case 14A top plate 14B peripheral wall 15 screw boss (first screw boss)
16 Lower case 16A Bottom plate 16B Perimeter wall 17 Screw boss (second screw boss)
20 reel 30 leader pin 42 upper inner wall (first inner wall)
42A engaging part 43 recessed part 44 lower inner wall (second inner wall)
44A Engagement section 45 Convex section 50 Door 70 Write protect 80 Braking member 90 Release member 100 Rotating shaft T Recording tape

Claims (3)

An upper case with a peripheral wall standing on the top plate and a lower case with a peripheral wall standing on the bottom plate, and a substantially rectangular case that rotatably accommodates a reel on which a recording tape is wound;
A first inner wall formed on the top plate and constituting a rotation area of the reel;
A second inner wall formed on the bottom plate and constituting a rotation area of the reel opposite to the first inner wall;
A plurality of first screw bosses projecting from the top plate on the outer side of the first inner wall ;
A plurality of second screw bosses projecting from the second inner wall so as to be able to abut against the first screw boss on the bottom plate on the outer side ;
In a recording tape cartridge comprising:
A part of the first inner wall on a virtual line connecting the first screw boss and the rotation center of the reel in a bottom view and the virtual line connecting the second screw boss and the rotation center of the reel in a plan view. A configuration in which a concave portion is formed on any one of the second inner walls and a convex portion is formed on any one of the other, and the convex portion hits the concave portion when the upper case and the lower case are joined. A recording tape cartridge characterized by that. The recording tape cartridge according to claim 1 , wherein an abutting height of the convex portion with respect to the concave portion is the same as an abutting height of the screw boss . The recording tape cartridge according to claim 1 , wherein at least four sets of the concave portion and the convex portion are formed .

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