JP2005135486A - Recording media cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording media cartridge for psychologically preventing dishonest act by surely identifying at a glance whether a case in which upper and lower cases are mainly joined by screwing had been disassembled improperly. <P>SOLUTION: In the recording media cartridge 10 having the case 12 for accommodating recording media T in which upper and lower cases 16, 18 are joined by a plurality of screws 39, the head of at least one screw 39 is coated with paint P among a plurality of screws 39 by which the upper and lower cases 16, 18 are joined. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, a recording medium such as an optical disk, a magnetic disk, or a magnetic tape that is mainly used as a recording / reproducing medium for a computer or the like is accommodated in a case in which an upper case and a lower case are joined by screws. The present invention relates to a recording medium cartridge.

  2. Description of the Related Art Conventionally, a magnetic tape cartridge (recording media cartridge) is known in which a magnetic tape used as a data recording / reproducing medium such as a computer is wound around a single reel and the reel is accommodated in a case. . A leader member such as a leader pin, a leader tape, or a leader block is provided at the tip of the magnetic tape, and a leader provided on the drive device side pulls out the leader member from the opening of the magnetic tape cartridge and is fixed thereto. The magnetic tape is wound around a take-up reel on the drive device side.

  In addition, a reel gear is engraved in an annular shape at the center of the lower surface of the reel exposed from the opening formed in the lower surface of the magnetic tape cartridge, and the drive gear provided on the rotating shaft on the drive device side is in the reel gear. The reel is configured to be rotationally driven by meshing. Therefore, by rotating the reel of the magnetic tape cartridge and the take-up reel of the drive device in synchronization, data can be recorded on the magnetic tape and data recorded on the magnetic tape can be reproduced.

  In the magnetic tape cartridge (recording media cartridge) having such a configuration, the synthetic resin case in which a single reel wound with a magnetic tape is accommodated mainly has an upper case and a lower case of a substantially rectangular tray shape. It is joined by sonic welding or screwing. In particular, when the upper case and the lower case are joined together by screwing, screw bosses that are in contact with each other in opposition to each other are provided near the corners of the upper case and the lower case. ) Screw is screwed into the screw boss from the side, and the upper case and the lower case are joined (for example, refer to Patent Document 1).

  However, when the upper case and the lower case are joined by screwing in this way, there is a problem that the case can be easily disassembled. That is, for example, the magnetic tape housed in the case is replaced for each reel, or the memory board on which various information about the magnetic tape cartridge (recording media cartridge) is replaced is overwritten with what was originally unrecordable. There was a risk of problems such as being In particular, in the case of a WORM (Write Once Read Many) cartridge that becomes write-only and cannot be overwritten after writing once, important data is often recorded. The damage will be enormous.

  For this reason, after joining the upper case and the lower case by screwing, it has been proposed to fill the hole in the screw boss of the lower case in which the screw is immersed so that the screw cannot be removed (for example, Patent Document 2). And Patent Document 3). Such a configuration is preferable because unauthorized disassembly is surely prevented. However, if the magnetic tape cartridge (recording media cartridge) is to be recycled (successfully disassembled), the disassembly is reversed. The problem that it becomes difficult to do occurs.

In addition, there is a magnetic tape cartridge in which an upper case and a lower case are joined by ultrasonic welding or the like in order to prevent unauthorized disassembly. However, in the case of this magnetic tape cartridge, if it is welded over the entire circumference, sometimes the movement of the magnetic tape itself and various sliding members arranged in the case may be affected. It was. For example, in the case of a magnetic tape cartridge provided with a door that slides (slids) to open and close the opening, there is a possibility that the slidability of the door is impaired. For this reason, partial welding has been considered, but this makes it impossible to completely prevent illegal disassembly.
JP-A-11-339436 Japanese Utility Model Publication No.59-118189 Japanese Utility Model Publication No. 58-165789

  Therefore, the present invention mainly makes it possible to identify at a glance whether or not the upper case and the lower case have been illegally disassembled with respect to the case where the upper case and the lower case are joined together with screws, and the psychological behavior can be identified psychologically. It is an object of the present invention to obtain a recording medium cartridge that prevents the above-mentioned problem.

  In order to achieve the above object, a recording medium cartridge according to claim 1 of the present invention is provided with a case in which an upper case and a lower case are joined by a plurality of screws and which accommodates the recording medium. The coating material is applied to the head of at least one screw among the plurality of screws joining the upper case and the lower case.

  In the invention of claim 1, since the paint is applied to the head of at least one screw among the plurality of screws joining the upper case and the lower case, the screw is turned with a screwdriver or the like in order to disassemble it illegally. In some cases, the paint applied to it is peeled off. In other words, it is possible to recognize at a glance that the recording media cartridge (case) has been illegally disassembled by removing the paint applied to the head of the screw. Can be prevented.

  According to a second aspect of the present invention, in the recording medium cartridge according to the first aspect, the paint is applied only in a driver fitting groove formed on the head of the screw. It is a feature.

  In the invention of claim 2, since the paint is applied only in the driver fitting groove formed in the head of the screw, the amount of paint used for one recording medium cartridge can be reduced. Therefore, it is preferable in terms of cost.

  According to a third aspect of the present invention, in the recording medium cartridge according to the first or second aspect, the paint is a type of paint that is cured by irradiation with ultraviolet rays.

  In the invention of claim 3, since the coating applied to the head of the screw is a type of coating that is cured by irradiating with ultraviolet rays, it is cured immediately. That is, the drying time of the paint can be short in the manufacturing process of the recording medium cartridge. Further, since there is no evaporation of the solvent, there is no worry of affecting the recording medium. Furthermore, since the adhesiveness with respect to a metal is weak, when a screw is turned with a driver, it peels off reliably.

  According to a fourth aspect of the present invention, in the recording medium cartridge according to any one of the first to third aspects, the color of the paint is different from at least the color of the screw.

  In the invention of claim 4, since the color of the paint is at least different from the color of the screw, it is possible to easily and surely identify whether or not it is illegally decomposed.

  As described above, according to the present invention, whether or not the upper case and the lower case are mainly disassembled illegally with respect to the case where the upper case and the lower case are joined together can be reliably identified at a glance. Therefore, such an illegal act can be prevented psychologically.

  Hereinafter, a recording medium cartridge according to an embodiment of the present invention will be described by taking a magnetic tape cartridge 10 shown in the drawings as an example. First, the overall configuration of the magnetic tape cartridge 10 will be described, and then the main part according to the present invention will be described in detail. For convenience of explanation, the direction in which the magnetic tape cartridge 10 is loaded into the drive device is indicated by an arrow A, which is the front direction (front side) of the magnetic tape cartridge 10. The arrow B direction orthogonal to the arrow A is the right direction.

  As shown in FIGS. 1 to 3, the magnetic tape cartridge 10 includes a single reel 14 in which a magnetic tape T as an information recording / reproducing medium is wound in a synthetic resin case 12 having a substantially rectangular shape in plan view. It is configured to be rotatably accommodated. The case 12 has a pair of upper and lower cases 16 and 18A, 18A each having a pair of an upper case 16 and a lower case 18 each having a right front corner, which is one corner on the leading side in the loading direction of the drive device, cut obliquely in plan view. And a space for accommodating the reel 14 around which the magnetic tape T is wound is provided.

  In addition, the cut off corners of the peripheral walls 16A and 18A of the upper case 16 and the lower case 18 serve as an opening 20 for pulling out the magnetic tape T, and a free end of the magnetic tape T drawn from the opening 20 is connected to the free end of the drive device. A leader pin 22 that is pulled out while being locked (engaged) by a drawing means (not shown) is connected. An annular groove 22A is formed at both ends of the leader pin 22 projecting from the widthwise end of the magnetic tape T, and the annular groove 22A is locked to a hook or the like of the drawing means. Thereby, when pulling out the magnetic tape T, the hook or the like is in contact with the magnetic tape T and is not damaged.

  A pair of upper and lower pin holding portions 24 for positioning and holding the leader pin 22 in the case 12 are provided inside the opening 20 of the case 12, that is, on the inner surface of the top plate of the upper case 16 and the inner surface of the bottom plate of the lower case 18. ing. The pin holding portion 24 has a substantially semi-cylindrical shape with the drawing side of the magnetic tape T open, and both end portions of the leader pin 22 in an upright state enter / exit into the recess 24A of the pin holding portion 24 from the open side. Held possible.

  In the vicinity of the pin holding portion 24, a leaf spring 25 is provided at the base of the spring holding portion 27 and the groove portion 23 provided on the inner surface of the front wall 12A (the portion of the peripheral walls 16A and 18A whose outer surface faces the arrow A direction). Is inserted and fixedly arranged so that the bifurcated tip portion of the leaf spring 25 engages with the upper and lower end portions of the leader pin 22 to hold the leader pin 22 on the pin holding portion 24. It has become. In addition, when the leader pin 22 enters / exits the pin holding part 24, the front-end | tip part of the leaf | plate spring 25 is elastically deformed suitably, and is a structure which accept | permits the movement of the leader pin 22. FIG.

  Further, a gear opening 26 for exposing the reel gear 13 of the reel 14 to the outside is provided in the central portion of the lower case 18, and the reel gear 13 is engaged with a drive gear (not shown) of the drive device. Thus, it is driven to rotate within the case 12. Further, the reel 14 is partially protruded from the inner surfaces of the upper case 16 and the lower case 18 so as not to be rattled by an idle regulation wall 28 as an inner wall on a circular locus coaxial with the gear opening 26. Is held in.

  A bag portion 28 </ b> A having a position regulating hole 43 formed therein is continuously provided at an end portion of the floating regulating wall 28 near the opening 20. Further, on the inner side of the left front corner of the case 12, a bag portion 29 in which a position restricting hole 45 that is a long hole is formed is provided apart from the floating restricting wall 28. The bag portions 28A and 29 are arranged on a straight line along the arrow B direction. Then, except for the end portion where the bag portion 28A is continuously provided, each of the floating regulation walls 28 is connected to the peripheral wall 16A or the peripheral wall 18A of the case 12 so that the outside and the reel 14 are installed. Partitions the space.

  In addition, a memory board M in which various information is stored for each magnetic tape cartridge 10 is installed at the right rear portion of the lower case 18. The drive device reads from the lower surface (bottom surface) side of the case 12. And a library device that reads from the rear wall (rear surface) side (a device that accommodates a plurality of magnetic tape cartridges 10 and automatically loads and unloads the drive device) A rear inner wall 18B excluding both ends of the case 18 is formed on an inclined surface having a predetermined angle, and the memory board M is supported by the rear inner wall 18B and the support protrusion 19 so as to be inclined at a predetermined angle.

  In addition, a write protect 60 is set at the left rear portion of the lower case 18 so as to be slidable in the left-right (width) direction. The inner wall 18B is provided with a substantially rectangular opening 15 from which an operation projection 62 for operating the write protect 60 by hand is projected. A substantially elliptical opening 17 is formed in the lower surface (bottom surface) of the lower case 18 to expose the identification protrusion 64 for identifying whether the drive device can record.

  In addition, a pair of upper and lower short inclined wall portions 30 that define the front edge portion of the opening 20 are provided at the right end portion of the front wall 12 </ b> A of the case 12. The inclined wall portion 30 is formed to bend along the open surface of the opening 20, and when the opening 20 is closed, a front end of a substantially arcuate door 50 in a plan view, which will be described later, enters the inside thereof, so that a gap through which dust or the like can enter is formed. It is a dust barrier that prevents it from occurring. A pair of upper and lower screw bosses 32 are connected to the inside of the front wall 12 </ b> A near the left side of the inclined wall portion 30.

  In addition, on the inner side of the front end of the right wall 12B of the case 12 (the portion of the peripheral walls 16A and 18A whose outer surface faces the arrow B direction), the upper and lower sides of the shape substantially along the outer peripheral surface of the door 50 described later in plan view A pair of inclined wall portions 34 are provided. The front end surface of the inclined wall portion 34 defines the rear edge of the opening 20, and a pair of upper and lower screw bosses 36 are provided at the front end portion.

  In the case 12 (the upper case 16 and the lower case 18), a pair of upper and lower screw bosses 33 are also provided at a predetermined position between the floating regulation wall 28 and the front wall 12A in the vicinity of the bag portion 29, and the left wall A pair of upper and lower screw bosses 35 and 37 are provided in the vicinity of 12C and the right wall 12B, and also at predetermined positions (near both corners) on the left and right sides of the rear inner wall 18B. The pair of upper and lower screw bosses 32, 33, 35, 36, and 37 penetrate the lower case 18 side and do not penetrate the upper case 16 side, and the screw 39 is screwed from the lower surface (bottom surface) side of the lower case 18. It has become so.

  The right wall 12B of the case 12 is provided with a slit 40 having a predetermined length as a window portion that communicates the inside and outside of the case 12, and is used for exposing an operation projection 52 of the door 50 described later. The slit 40 is formed by cutting out the front lower portion of the peripheral wall 16A of the upper case 16 constituting the right wall 12B into a substantially rectangular shape, and is also open to the opening 20 side. As described above, it is preferable that the slit 40 is formed while leaving a part of the peripheral wall 16A on the upper side because the rigidity of the case 12 can be maintained.

  Further, on the rear side of the lower case 18, a portion excluding the upper end of the peripheral wall 18 </ b> A is recessed inward of the case 12 in a substantially “U” shape in sectional view, and is also recessed upward from the lower surface of the case 12 (the bottom plate is A recess 48 is formed. The recess 48 is also formed on the left wall 12C side of the case 12, and is, for example, an engaging portion that engages with a pull-in means (not shown) of the drive device, or its top surface (downward surface) is inside the drive device. It is designed to be a reference surface for positioning in

  In addition, the portion excluding the upper end of the peripheral wall 18A is recessed inward of the case 12 in a substantially “U” shape in cross-section and also recessed upward from the lower surface of the case 12 (the bottom plate is cut). A recess 46 is formed. The concave portion 46 is an engaging portion with which the gripping means of the library apparatus is engaged. By providing the concave portions 46 and 48, the torsional strength of the case 12 (lower case 18) is improved. A concave portion 44 having a substantially trapezoidal shape in plan view is formed on the upper surface portion of the left wall 12 </ b> C of the upper case 16. The concave portion 44 is an engaging portion that engages with a holding member (not shown) for canceling a rotational moment accompanying movement of the door 50 in the opening direction when the opening 20 is opened.

  Further, in the upper case 16 and the lower case 18, the convex portion 51 of the door 50 described later is sandwiched from both the inner surface side and the outer surface side from the vicinity of the inclined wall portion 30 and from the vicinity of the opening 20 to the vicinity of the rear wall. A guide wall portion 42 having a predetermined height (for example, about 1.0 mm to 1.5 mm) to be supported is erected. The guide wall portion 42 is formed in a substantially circular arc shape in plan view, and the lengths of the upper case 16 and the lower case 18 are different. The upper case 16 side is closer to the rear side than the lower case 18 side. It is formed long. This is because the memory board M is inclined at a predetermined angle on the right wall 12B side of the rear inner wall 18B of the lower case 18.

  Further, the rear end portion of the guide wall portion 42 is closed in a substantially arc shape in a plan view, and the rearmost convex portion 51 is restricted so that the door 50 cannot move further rearward. Yes. On the other hand, the front end portion of the guide wall portion 42 is open, and when the leader pin 22 is put in and out, a position that does not prevent the leader pin 22 from being put in and out, for example, rearward of the pin holding portion 24 and having an opening width. It extends to about half the position.

  Further, on the inner surface of the upper case 16 and the inner surface of the lower case 18, ribs 38 that form a substantially trapezoidal shape in plan view integrally with the outer guide wall portion 42 exposed from the opening 20 are formed with the guide wall portion 42. The ribs 38 are erected so as to have the same height, and the ribs 38 ensure the strength of the upper case 16 and the lower case 18 in the opening 20 portion. The inner guide wall portion 42 is continuously provided so as to be integrated with the pin holding portion 24. However, the height of the pin holding portion 24 is substantially equal to the height of the guide wall portion 42 provided integrally therewith. Or higher than that.

  As described above, the upper case 16 and the lower case 18 are connected to the screw bosses 32 and 36 located near the edge of the opening 20 and the screw bosses 33, 35, and 37 from the lower surface (bottom surface) side of the lower case 18. The screw 39 is screwed (screwed) and fixed (joined). Accordingly, the corner portions of both ends of the opening 20 that are defined by the free ends of the inclined wall portion 30 (the front wall 12A) and the inclined wall portion 34 (the right wall 12B) in particular, are disadvantageous in strength and easily collide with the ground or the like when dropped. Are firmly joined, and even if the case 12 is dropped, the magnetic tape cartridge 10 is not deformed by the weight of the entire magnetic tape cartridge 10 or buckled and displaced. Such screwing is preferable because the magnetic tape cartridge 10 is easily disassembled when recycled.

  The opening 20 is opened and closed by a door 50 as a shielding member. The door 50 has a plate width (height) of at least a portion that closes the opening 20 substantially the same as the opening height of the opening 20, and a plate length that is sufficiently larger than the opening width of the opening 20. And it is formed in the planar view substantially circular arc shape curved in the plate | board thickness direction so that it can move along a predetermined | prescribed circumference.

  The door 50 closes the opening 20 in a state in which the front end portion enters the inside of the inclined wall portion 30, and slides (slids) substantially rearward along the predetermined circumference to open the opening 20. When the outer peripheral surface in the vicinity of the tip reaches the vicinity of the screw boss 36, the opening 20 is completely opened. And it is the structure which obstruct | occludes the opening 20 by sliding (sliding) in the direction opposite to the time of opening the opening 20.

  The curved longitudinal dimension of the door 50 is determined so that the rear end portion thereof is positioned in the right rear corner portion (near the concave portion 46) behind the concave portion 48 of the case 12 when the opening 20 is closed. The rear lower portion of the door 50 is notched obliquely in order to avoid the memory board M inclined at a predetermined angle on the rear inner wall 18B of the lower case 18.

  Further, the upper and lower surfaces of the door 50 are in contact with the guide surfaces of the guide wall portion 42 (inner surfaces facing each other) and the inner surfaces of the upper case 16 and the lower case 18 between the guide wall portions 42, respectively. A projecting portion 51 is provided to guide the door 50 in the opening / closing direction of the opening 20. The convex portions 51 are formed in a substantially elliptical shape in plan view that is long along the longitudinal direction of the door 50, four on each of the upper surface and the lower surface, vertically symmetrical except for the rearmost convex portion 51, and the guide It is provided so as to have a height substantially equal to the height of the wall portion 42. The reason why the rearmost convex portion 51 is not vertically symmetric is that the rear lower portion of the door 50 is cut obliquely.

  Providing such a convex portion 51 can reduce sliding resistance (friction) between the guide surface of the guide wall portion 42 and the inner surface of the upper case 16 and the lower case 18 between the guide wall portions 42 and the door 50. Thus, the door 50 can be smoothly slid with little resistance. Furthermore, when the convex portion 51 is formed in a substantially elliptical shape in a plan view, the impact resistance is superior to that formed in a substantially circular shape in a plan view, for example. Therefore, even if a force is applied to the door 50 from a direction other than the opening / closing direction due to an impact such as a drop, there is no worry that the convex portion 51 is broken.

  Further, an operation projection 52 as an operation portion is provided along the radial direction of the door 50 on the outer peripheral surface slightly in front of the longitudinal center portion of the door 50 (near the boundary portion where the plate width of the door 50 is different). ing. The operation protrusion 52 is exposed to the outside of the case 12 from the slit 40. When the opening 20 is closed, the operation protrusion 52 is positioned slightly spaced from the rear end of the screw boss 36 and is opened to the front of the slit 40. It is possible to operate from the part. In the open state of the opening 20, the operation protrusion 52 is positioned slightly spaced from the rear edge of the slit 40. At this time, the rear end portion of the guide wall portion 42 is located at the rearmost end side. The convex portion 51 is in contact.

  Further, a stopper 58 is provided on the inner surface of the front end portion of the door 50 so as to contact the upper and lower side surfaces of the leader pin 22 when the opening 20 is closed. It is made to prevent falling off from the portion 24. The coil spring 56 as a biasing member that biases the door 50 in the closing direction of the opening 20 has a length that reaches the right rear corner of the case 12 when the door 50 is closed. The space between the floating regulation wall 28 and the right wall 12B (peripheral walls 16A, 18A) in the portion is disposed effectively.

  That is, on the inner peripheral surface in the vicinity of the rear end of the door 50, a spring holding portion 54 having a substantially “L” shape in rear view is integrally projected upward, and on the inner surface in the vicinity of the recess 48 of the lower case 18. A cylindrical spring locking portion 55 projects upward. Ring-shaped attachment portions 56A and 56B are formed at both ends of the coil spring 56, respectively. Therefore, the coil spring 56 can be easily inserted into the above-described space by inserting one mounting portion 56B of the coil spring 56 into the spring locking portion 55 from above and inserting the other mounting portion 56A into the spring holding portion 54 from above. It is attached.

  In the magnetic tape cartridge 10 configured as described above, the case 12 is joined by screws as described above. A cylindrical convex portion is formed at the tip (lower end) of each screw boss 32, 33, 35, 36, 37 of the upper case 16, and the tip of each screw boss 32, 33, 35, 36, 37 of the lower case 18 is formed. An annular concave portion is formed in the portion (upper end portion), and each screw boss 32, 33, 35, 36, 37 has a funnel structure in which the tip portions abut against each other and are engaged with each other.

  Accordingly, the screw bosses 32, 33, 35, 36, and 37 of the upper case 16 and the lower case 18 are satisfactorily assembled while the misalignment in molding and the like are regulated, whereby the upper case 16 and the lower case 18 are The joining accuracy is improved. In addition, the cylindrical convex part is formed in each screw boss 32, 33, 35, 36, 37 of the lower case 18, and the annular concave part is formed in each screw boss 32, 33, 35, 36, 37 of the upper case 16. Needless to say.

  When each screw boss 32, 33, 35, 36, 37 is assembled, a metal screw 39 is screwed from the lower surface (bottom surface) side of the lower case 18. The screw 39 is preferably a screw that can be screwed only by a special screwdriver, but is not particularly limited. As a result, the upper case 16 and the lower case 18 are joined and the case 12 is assembled. After the screws 39 are screwed together, as shown in FIG. 4 and FIG. The paint P is applied to the entire head of at least one of the five screws 39.

  The paint P is an ultraviolet curable paint and is a type of paint that is instantly cured by irradiation with ultraviolet rays. Therefore, in the manufacturing process of the magnetic tape cartridge 10, there is an advantage that the drying time after applying the coating material P is short (several seconds are enough). Further, the ultraviolet curable coating P has an advantage that there is no fear of adversely affecting the magnetic tape T because the solvent does not evaporate.

  Furthermore, the coating P is applied to the head of the screw 39 in a thickness of 200 μm to 300 μm, but has low adhesion to metal to such an extent that there is no fear of peeling off in a non-contact manner (vibration or the like). Therefore, when the screwdriver is inserted into the screwdriver fitting groove 39A formed on the head of the screw 39 and turned, the screw is surely peeled off as shown in FIG. Therefore, when an attempt is made to disassemble the magnetic tape cartridge 10 (case 12) illegally, it can be easily and reliably recognized at a glance, and this illegal disassembly can be prevented psychologically.

  It is desirable that the color of the paint P be at least different from the color of the screw 39 (preferably the color of the case 12), and a brighter bright color (for example, the color of the screw 39 is silver) The color of the paint P is preferably red. According to this, the peeling state of the coating material P as shown in FIG. Further, in order to prevent tampering such as removing the screw 39 illegally and applying the same paint as the paint P again, the paint P is altered using a special paint such as an ultraviolet light emitting paint. It may be possible to determine whether it has been broken or not, which is preferable.

  Further, since the screw 39 is rotated by inserting a screwdriver into the screwdriver fitting groove 39A formed on the head of the screw 39, the paint P is applied to the screwdriver fitting groove as shown in FIGS. You may make it apply | coat only in 39A. According to this, since the usage-amount of the coating material P with respect to one magnetic tape cartridge 10 can be reduced, it becomes advantageous in cost. Even in such a configuration, when the magnetic tape cartridge 10 (case 12) is illegally disassembled, the paint P is surely peeled off as shown in FIG. Recognize that the cheating was done. Therefore, the cheating can be prevented psychologically.

  It is sufficient that the coating P is applied to the head of at least one screw 39 among a plurality (five in the drawing) of the screws 39 in which the upper case 16 and the lower case 18 are joined. It may be applied to 39 heads. Further, the structure may be such that the driver fitting groove 39A formed in the head of the screw 39 is filled with the paint P and the driver fitting groove 39A is completely filled with the paint P.

  Next, the operation of the present embodiment in the magnetic tape cartridge 10 configured as described above will be described. In the magnetic tape cartridge 10 including the case 12 having the above-described configuration, the opening 20 is closed by the door 50 when not in use (during storage or transportation). When the magnetic tape T is used, the magnetic tape cartridge 10 is loaded into the drive device along the arrow A direction.

  Then, along with this loading, an opening / closing member (not shown) constituting the opening / closing means of the drive device enters the slit 40 opened forward and engages with the operation protrusion 52 of the door 50. In this state, when the magnetic tape cartridge 10 is further pushed in, the opening / closing member moves the operation protrusion 52 backward while resisting the biasing force of the coil spring 56 by this pushing force (magnetic loaded in the direction of arrow A). (Relatively move backward with respect to the tape cartridge 10).

  Then, in the door 50 on which the operation projection 52 protrudes, the convex portion 51 is guided by the guide wall portion 42 and slides along the bending direction. That is, the door 50 moves substantially rearward so as to wrap around the outside of the pin holding portion 24 and the reel 14 without protruding from the movement locus along the curved shape by the guide wall portion 42, thereby opening the opening 20. When the magnetic tape cartridge 10 is loaded into the drive device at a predetermined depth, the opening 20 is completely opened.

  Thus, when the magnetic tape cartridge 10 with the opening 20 opened is positioned in the drive device, the door 50 is restricted from further sliding (moving substantially rearward). The pulling means of the drive device enters the case 12, and the pulling means pulls out the leader pin 22 positioned and held by the pin holding part 24. Then, the leader pin 22 is accommodated in a take-up reel (not shown), and the take-up reel and the reel 14 are driven to rotate synchronously. Then, the magnetic tape T is sequentially pulled out from the case 12 while being wound around the take-up reel, and information is recorded and reproduced by a recording / reproducing head or the like disposed along a predetermined tape path.

  On the other hand, when the magnetic tape cartridge 10 is ejected from the drive device, the magnetic tape T is rewound onto the reel 14 and the leader pin 22 is held by the pin holding portion 24. The magnetic tape cartridge 10 is released from the positioning state and is moved in the direction opposite to the arrow A direction by the biasing force of the coil spring 56 or an unillustrated ejecting mechanism. Thus, the door 50 slides in the closing direction of the opening 20 by the biasing force of the coil spring 56 while the convex portion 51 is guided by the guide wall portion 42, and completely closes the opening 20 (returns to the initial state). To do).

  Here, the screw bosses 32, 33, 35, 36, and 37 provided on the upper case 16 and the lower case 18 are formed in a corrugated structure in which the upper and lower cases 16 and 18 are engaged with each other. Even if each of the screw bosses 32, 33, 35, 36, 37 is misaligned in molding, it is well assembled (abutted and fitted) while being regulated. The upper case 16 and the lower case 18 are joined with high accuracy by screwing a metal screw 39 from the lower surface (bottom surface) side of the lower case 18.

  A driver formed on the entire head of at least one screw 39 or on the head of the screw 39 among a plurality (five in the drawing) of screws 39 in which the upper case 16 and the lower case 18 are joined. Only in the fitting groove 39A, the paint P of a color different from the color of the screw 39 is applied. The paint P is an ultraviolet curable paint and has a property of weak adhesion to metal.

  Accordingly, when the magnetic tape cartridge 10 (case 12) is illegally disassembled and the screwdriver 39 is inserted into the screwdriver fitting groove 39A of the screw 39 and rotated, the paint P is reliably peeled off. That is, when an illegal disassembly act is performed on the magnetic tape cartridge 10 (case 12), it can be easily and reliably recognized at a glance. It can be prevented psychologically.

  Moreover, the magnetic tape cartridge 10 (case 12) is illegally disassembled with a simple configuration in which the ultraviolet curing paint P is applied to the head of the screw 39 (at least in the driver fitting groove 39A). It is possible to give an impression that it is difficult to disassemble (not to give the impression that it can be disassembled), so as in the past, filling the hole of the screw boss where the screw was immersed with resin to cheating This is preferable in terms of cost as compared with the cartridge in which the magnetic tape cartridge 10 is to be prevented. Conversely, when the magnetic tape cartridge 10 needs to be properly disassembled such as when the magnetic tape cartridge 10 is recycled, it can be easily disassembled.

  As described above, in any of the above embodiments, the magnetic tape cartridge 10 has been described as an example. However, the recording medium according to the present invention is not limited to the magnetic tape T, and may be a broad sense such as an optical disk or a magnetic disk. Includes recording media. The present invention can be applied to all recording media cartridges in which such a recording medium is accommodated in a case.

Schematic perspective view from above of magnetic tape cartridge Schematic exploded perspective view of magnetic tape cartridge Schematic perspective view from below of magnetic tape cartridge Partially enlarged schematic bottom view showing how paint is applied to the entire screw head (A) Schematic plan view showing a screw head from which the paint of FIG. 4 has not been peeled off, (B) Schematic plan view showing a screw head from which the paint of FIG. 4 has been peeled off Partially enlarged schematic bottom view showing how paint is applied only in the screwdriver fitting groove formed on the screw head (A) Schematic plan view showing a screw head from which the paint of FIG. 6 has not been peeled off, (B) Schematic plan view showing a screw head from which the paint of FIG. 6 has been peeled off

Explanation of symbols

10 Magnetic tape cartridge (recording media cartridge)
12 Case 16 Upper case 18 Lower case 32, 33, 35, 36, 37 Screw boss 39 Screw 39A Driver fitting groove P Paint

Claims (4)

In the recording media cartridge having a case in which the upper case and the lower case are joined by a plurality of screws and accommodate the recording medium,
A recording media cartridge, wherein a coating material is applied to a head of at least one of the plurality of screws joining the upper case and the lower case.   The recording medium cartridge according to claim 1, wherein the paint is applied only in a driver fitting groove formed in the head of the screw.   The recording medium cartridge according to claim 1, wherein the paint is a type of paint that cures when irradiated with ultraviolet rays.   4. The recording medium cartridge according to claim 1, wherein the color of the paint is different from at least the color of the screw.

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