JP2007213642A - Disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk cartridge for a changer, for which the storage density of a disk tray is high and durability and reliability are excellent. <P>SOLUTION: The disk cartridge is provided for storing the plurality of disk trays 4 inside a cartridge case 1, and the respective disk trays 4 are held by guide ribs 41 and 51 formed on the inner side face of the cartridge case 1. At the upper surface center part of the disk tray 4, a disk storing recessed part 61 composed of a circular peripheral wall 64 and a rib-like disk holding part 65 projected inwards from the lower part of the peripheral wall 64 is formed. Also, on two sides held by the guide ribs 41 and 51 on the lower surface, a step part 63 is formed. The distance between the end faces of the respective step parts 63 is formed smaller than the diameter of the peripheral wall 64, and in a part 66 on the outer side of the end faces of the respective step parts 64, the disk holding part 65 is not formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a changer disk cartridge in which a plurality of disk trays are housed in a cartridge case, and more particularly to a means for increasing the storage density of the disk trays in the cartridge case.

  Conventionally, a disk cartridge for a changer has been proposed in which a plurality of disk trays on which information recording disks are placed are housed in a single cartridge case, and used detachably in a disk drive device. (For example, refer to Patent Document 1).

In the disc cartridge described in Patent Document 1, a plurality of guide ribs are formed in parallel on the inner surfaces of two side plates constituting the cartridge case, and the side portions of each disc tray are placed on each guide rib. Thus, each disc tray can be stably held, and each disc tray can be taken out from the cartridge case and stored in the cartridge case from the outside.
JP 2000-40324 A

  By the way, in this type of disk cartridge, miniaturization and increase in recording capacity are one of the most important technical problems. In order to solve such problems, an information recording disk that can be stored in a cartridge case. There is a strong demand for the development of technology to increase the number of sheets.

  In the disk cartridge of the type in which the disk tray is placed on the guide rib formed on the inner surface of the side plate of the cartridge case like the disk cartridge described in Patent Document 1, in order to store one disk tray in the cartridge case Since the total thickness of the disc tray thickness, the guide rib thickness and the margin for smoothly inserting and removing the disc tray is required, at least one of the disc tray thickness and the guide rib thickness is required. Unless it decreases, the storage density of the disk tray cannot be increased any more.

  However, if the dimensions of each of these parts are reduced, the strength of each part will be reduced and durability and operational stability will become a problem. If the thickness of the disk tray is reduced, the disk will be removed when the disk tray is inserted into and removed from the cartridge case. Since the recording surfaces of the information recording discs placed on the tray are likely to come into contact with other disc trays stored in the cartridge case adjacent to each other, the storage stability of the information recording discs deteriorates.

  The present invention has been made to solve such deficiencies in the prior art, and an object of the present invention is to provide a disk cartridge for a changer having a high storage density of the disk tray and excellent durability and reliability. .

  In order to solve the above-described problems, the present invention includes a cartridge case having an opening, and a plurality of disk trays that are removably accommodated in the cartridge case through the opening and on which an information recording disk is placed. The plurality of disc trays are disc cartridges that are individually held by guide ribs formed at a predetermined pitch on the inner surface of the cartridge case, wherein the disc tray is used for storing the information recording disc. A disc housing recess and step portions provided on both sides of the disc tray corresponding to the guide rib, the disc housing recess holding a peripheral wall having a larger diameter than the information recording disc to be stored, and the information recording disc A disc holding portion for the stepped portion provided on both sides of the disc tray. Septum were allowed to overlap a portion of the disc housing recess and the stepped portion is made smaller than the diameter of the peripheral wall, the overlapping portion is a configuration that has become non-formation portion of the disk holding portion.

  When the step portion is formed along the side portion of the disc tray, the size in the thickness direction necessary to store one disc tray in the cartridge case is smoothed by the thickness of the step portion, the thickness of the guide rib, and the disc tray. The total thickness with the allowance for loading and unloading can be made, so the thickness direction dimension required to store one disc tray in the cartridge case by the size of the step at the stepped portion than before. Can be reduced. In addition, if the gap between the stepped portions is made smaller than the diameter of the peripheral wall so that the disc storage recess and the stepped portion overlap each other, and the overlapping portion is made a non-formed portion of the disc holding portion, the inner portion is closer than the peripheral wall of the disc storage recess. Since the tip end portion of the guide rib can be arranged up to the peripheral portion, the size in the width direction of the disc tray and thus the cartridge case can be made smaller than in the prior art.

  According to the present invention, in the disc cartridge having the above-described configuration, a protrusion for preventing contact between the information recording disc and another disc tray is formed on a non-step portion on the upper surface of the disc tray. .

  As described above, when the contact preventing protrusion is formed on the upper surface of the disc tray, the contact between the information recording disc placed on one disc tray and the other disc tray arranged adjacent to the information recording disc is prevented. This prevents the durability and reliability of this type of disk cartridge.

  According to the present invention, in the disc cartridge having the above-described configuration, the thickness dimension of the disc tray at the stepped portion is substantially equal to the thickness dimension of the information recording disc.

  Thus, if the thickness dimension of the disc tray in the step portion is substantially equal to the thickness dimension of the information recording disc, the distance between the two guide ribs arranged adjacent to each other can be minimized. Can be minimized.

  According to the present invention, the disc cartridge having the above-described configuration is configured such that a drop prevention portion for preventing the information recording disc from dropping is formed in the disc housing recess.

  As described above, when the information recording disk drop prevention portion is formed in the disk storage recess, the information recording disk can be prevented from dropping from the disk tray even when the cartridge case is used in a vertical position. The practicality and versatility of the cartridge can be improved.

  Further, in the disk cartridge having the above-described configuration, the diameter of the peripheral wall increases as the drop-off preventing portion increases in a part of the peripheral wall from the opening surface side of the peripheral wall to the disc holding portion side. The gradient part is formed.

  As described above, when the reverse slope portion is formed on a part of the peripheral wall, when the cartridge case is placed vertically, the outer peripheral edge portion of the information recording disk is brought into contact with the reverse slope portion, and the information recording disc is placed on the disc tray. Since a moment that rotates in the direction in which the holder is in close contact with the holder is generated, it is possible to prevent the information recording disk from falling off the disk storage recess.

  According to the present invention, in the disc cartridge having the above-described configuration, the drop-out preventing protrusion of the information recording disc is formed on a part of the peripheral wall as the drop-off preventing portion.

  As described above, when the protrusion for preventing the information recording disk from dropping is formed on a part of the peripheral wall, the holding protrusion is engaged with the outer periphery of the information recording disk stored in the disk storage recess. Even when the disk is placed vertically, it is possible to prevent the information recording disk from dropping from the disk housing recess.

  Since the disc cartridge of the present invention forms the step portion along the side portion of the disc tray, the dimension in the thickness direction required to store one disc tray in the cartridge case can be made smaller than before, It is possible to reduce the thickness of the disk cartridge or increase the number of information recording disks that can be stored in the disk cartridge. In addition, since the disc storage recess and a part of the stepped portion are overlapped and the overlapped portion is made a non-forming portion of the disc holding portion, the tip end portion of the guide rib can be arranged from the peripheral wall of the disc storage recess to the inner peripheral portion. Therefore, it is possible to reduce the size of the disk cartridge in the width direction as compared with the conventional case.

  Embodiments of a disk cartridge according to the present invention will be described below.

  As shown in FIGS. 1 to 3, the disk cartridge of this example includes a box-shaped cartridge case 1 having an opening 1a on one side surface, and a shutter 2 that is pivotally attached to the cartridge case 1 and opens and closes the opening 1a. A plurality of disc trays 4 that are housed in the cartridge case 1 through the opening 1a, and a plurality of information recordings that are placed on each disc tray 4. A disk 5, a management memory device 6 set in the cartridge case 1, a first shutter spring 7 stretched between the cartridge case 1 and the shutter 2, and the cartridge case 1 and the shutter lock member 3. It comprises a second shutter spring 8 stretched between them.

  As shown in FIG. 3, the cartridge case 1 has an upper case 11, a lower case 12, a left side plate 13, and a right side plate 14 and is formed in a box shape of a required size having an opening 1a on one side surface. . Each of the members 11, 12, 13, and 14 is made of a plastic injection molded product.

  As shown in FIGS. 4 to 6, the upper case 11 includes a substantially rectangular top plate 21 having step portions 21 a on the left and right sides of the front end portion (opening portion 1 a formation side), and a step portion 21 a of the top plate 21. The upper and lower left and right sides excluding the front part and the partition wall 22 having a fixed height are formed in a shape constituting the upper half of the cartridge case 1. A fitting protrusion 23 for fitting the front end upper portions of the side plates 13 and 14 projects outwardly from the end surface portion of the top plate 21 in front of the step portion 21a. On the other hand, the inner surface of the top plate 21 is spaced from the partition wall 22 suspended from the left and right sides of the top plate 21 with an interval at which the left side plate 13 can be inserted and an interval at which the right side plate 14 can be inserted. Two ribs 24 and 25 are formed in parallel, and protrusions 26 and 27 for temporarily fixing the side plates 13 and 14 protrude from portions facing the rear ends of the ribs 24 and 25, respectively. It is installed. Further, a boss 28 having a screw hole protrudes from the rear end corner of the inner surface of the top plate 21. Furthermore, a setting portion 29 of the management memory device 6 is formed on the inner surface of the partition wall 22 that is suspended from the rear side of the top plate 21.

  As shown in FIGS. 7 to 9, the lower case 12 includes a substantially rectangular bottom plate 31 having step portions 31 a on the left and right sides of the front end portion, both left and right sides of the bottom plate 31 excluding the front portion and the rear side. It is formed in a shape that constitutes the lower half of the cartridge case 1 with a partition wall 32 of a certain height standing from the side. A fitting projection 33 for fitting the lower portions of the front ends of the side plates 13 and 14 projects outwardly from the end surface portion of the bottom plate 31 in front of the step portion 31a. On the other hand, on the inner surface of the bottom plate 31, two ribs 34 and 35 are formed in parallel with portions corresponding to the ribs 24 and 25 formed on the upper case 11, and the rear ends of these ribs 34 and 35 are formed. The first bosses 36 and 37 for screwing the side plates 13 and 14 project from the portion facing the front side. A second boss 38 protrudes from a portion of the inner surface of the bottom plate 31 corresponding to the boss 28 formed on the upper case 11. Further, a setting portion 39 of the management memory device 6 is formed in a portion corresponding to the setting portion 29 formed in the upper case 11 of the partition wall 32 suspended from the rear side of the bottom plate 31.

  The upper case 11 and the lower case 12 are configured such that the lower side of the partition wall 22 and the upper side of the partition wall 32 face each other, and a required screw inserted into a screw hole formed in the boss 28 is screwed to the second boss 38. Assembled into a box.

  As shown in FIGS. 10 to 14, the left side plate 13 is a space formed by the top plate 21, the partition walls 22 and the ribs 24 of the upper case 11 and the bottom plate 31, the partition walls 32 and the ribs 34 of the lower case 12. It is formed in a shape and size that can be inserted into the. On the inner surface of the left side plate 13, a plurality of guide ribs 41 (seven in this example) are formed in parallel in the direction from the front end side to the rear end side. A mounting hole 42 of the shutter 2 is opened. On the other hand, in the vicinity of the mounting hole 42 on the outer surface of the left side plate 13, a spring hooking protrusion 42 a that locks one end of the first shutter spring 7 is projected. A fitting recess for fitting a fitting protrusion 23 formed on the upper case 11 and a fitting protrusion 33 formed on the lower case 12 on the upper and lower portions near the front end of the left side plate 13. 43 and 44 are formed. Further, an erroneous insertion preventing portion 45 of the disc tray 4 is formed at the rear end portion of the left side plate 13 and is engaged with a temporary fixing projection 26 formed on the inner surface of the upper case 11 at an upper portion thereof. A locking claw 46 is formed, and a screw hole 47 to be screwed by a screw inserted into a screw hole of the first boss 36 formed in the lower case 12 is formed at a lower portion thereof.

  As shown in FIGS. 15 to 19, the right side plate 14 is a space formed by the top plate 21, the partition walls 22 and the ribs 25 of the upper case 11 and the bottom plate 31, the partition walls 32 and the ribs 35 of the lower case 12. It is formed in a shape and size that can be inserted into the. The same number of guide ribs 51 are formed on the inner surface of the right side plate 14 at positions corresponding to the guide ribs 41 formed on the inner surface of the left side plate 13. A mounting hole 52 is opened. On the other hand, on the outer surface of the right side plate 14, a mounting projection 52 a of the shutter lock member 3 and a spring hooking projection 52 b that engages one end of the second shutter spring 8 are projected in a predetermined arrangement. Further, a fitting recess for fitting a fitting protrusion 23 formed on the upper case 11 and a fitting protrusion 33 formed on the lower case 12 on the upper and lower portions near the front end of the right side plate 14. 53 and 54 are formed. Further, an erroneous insertion preventing portion 55 for the disc tray 4 is formed at the rear end portion of the right side plate 14, and is engaged with a protrusion 27 for temporary fixing formed on the inner surface of the upper case 11 on the upper portion thereof. A locking hole 56 to be screwed by a screw inserted into a screw hole of the first boss 37 formed in the lower case 12 is formed at a lower portion thereof. Note that reference numeral 58 in the drawing denotes a tray locking portion for stably holding the disc tray 4 housed in the cartridge case 1. The tray locking portion 58 includes an elastic piece 58a formed by cutting out the three sides of the right side plate 14, and a locking claw 58b formed at the tip of the elastic piece 58a. The claw 58b is arranged in a tray insertion space formed between the guide ribs 51. The right side plate 14 has a slightly longer overall length than the left side plate 13.

  As shown in FIG. 20, the left side plate 13 is inserted from the opening 1 a along the inner surfaces of the left side of the upper case 11 and the lower case 12 that are integrally assembled. As a result, as shown in FIG. 21, the fitting protrusions 23 formed on the upper case 11 and the lower case 12 are formed in the fitting recesses 43 and 44 formed on the upper and lower portions near the front end of the left side plate 13. The fitting protrusion 33 thus formed is slidably fitted, and the upper case 11, the lower case 12, and the left side plate 13 are integrally coupled to the opening 1 a side of the center portion of the cartridge case 1. When the left side plate 13 is inserted to a predetermined position, the locking claw 46 formed at the rear end portion of the left side plate 13 is engaged with the temporarily fixing protrusion 26 formed on the inner surface of the upper case 11, Similarly, the opening position of the screw hole 47 opened at the rear end portion of the left side plate 13 and the opening position of the first boss 36 formed in the lower case 12 are automatically matched. Therefore, the left side plate 13 can be fixed to the lower case 12 by inserting and tightening the screw inserted into the screw hole of the first boss 36 into the screw hole 47.

  On the other hand, as shown in FIG. 20, the right side plate 14 is inserted from the opening 1a along the inner surfaces of the right side of the upper case 11 and the lower case 12 assembled together. As a result, the fitting protrusions 23 formed on the upper case 11 and the fitting protrusions 33 formed on the lower case 12 are respectively formed in the fitting recesses 53 and 54 formed on the upper and lower portions near the front end of the right side plate 13. The upper case 11, the lower case 12, and the right side plate 14 are integrally coupled by sliding fitting so that the opening 1 a side is closer to the center of the cartridge case 1. When the right side plate 14 is inserted to a predetermined position, the locking claw 56 formed at the rear end portion of the right side plate 14 is engaged with the temporarily fixing protrusion 27 formed on the inner surface of the upper case 11, Similarly, the opening position of the screw hole 57 formed in the rear end portion of the right side plate 14 and the opening position of the first boss 37 formed in the lower case 12 are automatically matched. Therefore, the right side plate 14 can be fixed to the lower case 12 by inserting and tightening the screw inserted into the screw hole of the first boss 37 into the screw hole 57. Thereby, the assembly of the cartridge case 1 is completed.

  As shown in FIG. 22, the disk tray 4 is formed in a substantially square shape whose outer shape can be accommodated in the cartridge case 1, and a tray operation arm provided in a disk drive device (not shown) is provided at the right corner of the front end. Hooks 4a are formed, and notches 4b and 4c for preventing incorrect insertion are formed at the left and right corners of the rear end. The difference in length between the notches 4b and 4c is set to the difference in length between the left side plate 13 and the right side plate 14. Further, the disc tray 4 of this example is held by a disc storage recess 61 formed at the center of the upper surface, a protrusion 62 provided around the disc storage recess 61 on the upper surface, and the guide ribs 41 and 51 on the lower surface. The step portions 63 are formed along two sides, and the distance between the end faces of each step portion 63 is formed smaller than the diameter of the circular peripheral wall 64 constituting the disc storage recess 61. . Furthermore, a substantially triangular engaging recess 4d for engaging a locking claw 58b formed on the right side plate 14 is formed in the rear portion of the right side. The disc tray 4 of this example is also formed with a plastic injection molded product.

  As shown in FIG. 23, the thickness h1 of the disc tray 4 is slightly larger than the sum of the dimension h5 of the gap between the two guide ribs 41 and 41 arranged adjacent to each other and the thickness h6 of the one guide rib 41. A small value (h1 <h5 + h6) is set. Further, the thickness h2 of the side portion held by the guide rib 41 is set to a value (h2 <h5) slightly smaller than the dimension h5 of the gap between the two guide ribs 41, 41 arranged adjacent to each other. . Therefore, the total dimension of the height h3 of the protrusion 62 and the step size h4 of the step portion 63 is slightly smaller than the thickness h6 of the single guide rib 41 (h3 + h4 <h6). Thereby, the thickness h2 of the disc tray 4 in the step portion 63 can be made substantially equal to the thickness of the information recording disc 5. The value of (h5 + h6-h1) and the value of (h5-h2) are appropriately set in consideration of the clearance necessary for smoothly sliding the disc tray 4 and the temporal deformation of the disc tray 4. The value of h6 is set in consideration of the strength and formability of the guide ribs 41 and 51. Further, the height h3 of the protrusion 62 and the step size h4 of the step portion 63 take into consideration the thickness of the information recording disc 5 and the thickness of a disc holding portion (described later) formed in the disc storage recess 61. The information recording disk 5 is set so as to be disposed in the gap between the two guide ribs 41 and 41 disposed adjacent to each other.

  The disc storage recess 61 is formed with a circular peripheral wall 64 having a diameter larger than the diameter of the information recording disc 5 and a rib-like disc holding portion 65 projecting inward from the lower side of the peripheral wall 64. A portion 66 outside the end face of each stepped portion 63 is a non-formed portion of the disc holding portion 65. The protruding amount s of the disc holding portion 65 from the peripheral wall 64 is set so that the disc holding portion 65 contacts only the outer peripheral non-recording area of the information recording disc 5. As shown in FIG. 24, the portion corresponding to the non-forming portion 66 of the disc holding portion 65 is a peripheral wall as a drop prevention portion for the information recording disc 5 from the opening surface side of the peripheral wall 64 to the disc holding portion 65 side. A reverse gradient portion 67 in which the diameter of 64 is increased is formed. On the other hand, in other portions, as shown in FIG. 25, the gradient of the peripheral wall 64 is the direction of the draft necessary for injection molding of the disc tray 4, that is, the disc holding portion from the opening surface side of the peripheral wall 64. The peripheral wall 64 is formed in a direction in which the diameter decreases as it reaches the 65 side.

  As shown in FIG. 26, the disc tray 4 is accommodated in the cartridge case 1 in a state where the information recording disc 5 is accommodated in the disc accommodating recess 61. When the disc tray 4 is stored in the cartridge case 1 in the correct direction, erroneous insertion prevention formed on the left side plate 13 up to the ends of the notches 4b and 4c formed at the rear end of the disc tray 4 Since the erroneous insertion preventing portion 55 formed in the portion 45 and the right side plate 14 is inserted, the disc tray 4 can be inserted and stored up to a predetermined position in the cartridge case 1. In this case, since the engaging claw 58b formed on the right side plate 14 engages with the engaging recess 4d formed on the disk tray 4, the disk tray 4 is inadvertently detached from the cartridge case 1. Is prevented. On the other hand, when the disc tray 4 is stored in the cartridge case 1 in the wrong direction, the corner portion of the disc tray 4 comes into contact with the erroneous insertion preventing portion 45 formed on the left side plate 13. Thus, further insertion is automatically prevented. As shown in FIG. 27, the disc tray 4 inserted into the cartridge case 1 in the correct direction has the stepped portion 63 placed on the guide ribs 41 and 51 formed on the cartridge case 1, and the information recording disc. 5 is also disposed in the gap between the two guide ribs 41 and 51 disposed adjacent to each other. As a result, the lateral width of the cartridge case 1 can be reduced.

  In the disc tray 4 of this example, since the reverse gradient portions 67 are formed in the peripheral wall 64 corresponding to the non-forming portion 66 of the disc holding portion 65, the cartridge case 1 is vertically oriented with each reverse gradient portion 67 facing up and down. 28, the outer peripheral edge portion of the information recording disk 5 is brought into contact with the lower reverse gradient portion 67 and the information recording disk 5 is brought into close contact with the disk holding portion 65 of the disk tray 4 as shown in FIG. A rotating moment M is generated. Therefore, the information recording disk 5 is prevented from dropping from the disk housing recess 61, and the practicality and versatility of the disk cartridge are improved.

  The information recording disk 5 is formed by forming a required thin film including an information recording film on one or both sides of a disk substrate. As the information recording film, any known information recording film such as a magnetic recording film, an optical recording film, or a magneto-optical recording film can be formed.

  The management memory device 6 records attributes and the like of the information recording disk 5 housed in the disk cartridge, and makes the use of the disk cartridge convenient. A wireless communication tag (RFID) or the like can be used. . The management memory device 6 is set in setting units 29 and 39 formed at the rear ends of the upper case 11 and the lower case 12.

  29, 32, and 33, the shutter 2 includes an upper surface portion 71 that covers the upper surface of the cartridge case 1, a front surface portion 72 that covers the front surface of the cartridge case 1, and a side surface portion that covers the side surface of the cartridge case 1. 73, and a support shaft 74 that is rotatably inserted into mounting holes 42 and 52 provided in the left side plate 13 and the right side plate 14 is opposed to the inner surface of the side surface portion 73. Projected. In addition, a spring hooking projection 75 that locks one end of the first shutter spring 7 protrudes from the inner surface of the left side surface portion 73, and a shutter lock member 3 described later is attached to and detached from the inner surface of the right side surface portion 73. An engaging protrusion 76 for freely engaging is provided. The shutter 2 of this example is pivotally attached to the front surface portion of the cartridge case 1 by inserting the support shaft 74 into the attachment holes 42 and 52. The first shutter spring 7 is stretched between the spring hooking protrusion 75 and the spring hooking protrusion 42a protruding from the outer surface of the left side plate 13, and always urges the shutter 2 in the opening direction. The shutter 2 of this example is also formed with a plastic injection molded product.

  As shown in FIGS. 30 and 31, the shutter lock member 3 includes a plate-shaped main body 81, an operation unit 82 erected outward from the lower front end of the main body 81, and the upper side of the main body 81. A substantially rod-shaped shutter locking portion 83 protruding forward of the main body 81 and an engaging portion 84 of the second shutter spring 8 protruding rearward from the rear end of the main body 81 are provided. In 81, an L-shaped attachment hole 85 and an engaging portion 86 of an attachment protrusion 52a formed in the right side plate 14 are formed. In the shutter lock member 3 of this example, after the mounting protrusion 52a formed on the right side plate 14 is inserted into the vertical side portion 85a of the mounting hole 85 formed in an L shape, the mounting protrusion 52a is formed in an L shape. By moving to the side portion 85b of the mounting hole 85 and engaging the tip portion thereof with the engaging portion 86, it is attached to the right side plate 14 so as to be movable back and forth as shown in FIGS. The second shutter spring 8 is stretched between a spring hooking protrusion 52b formed on the right side plate 14 and an engaging portion 84 formed on the shutter lock member 3, so that the shutter lock member 3 is always on the opening 1a side. Energize. The shutter lock member 3 of this example is also formed of a plastic injection molded product.

  When not in use, the shutter lock member 3 is moved to the opening 1a side of the cartridge case 1 by the elastic force of the second shutter spring 8, as shown in FIG. The shutter locking portion 83 is engaged with the shutter. Therefore, the shutter 2 is held in a closed state against the elastic force of the first shutter spring 7, and foreign matter and the like are prevented from entering the cartridge case 1 from the opening 1a.

  When the disk cartridge is installed in a disk drive device (not shown), as shown in FIG. 33, the release portion provided in the disk drive device presses the operation portion 82 of the shutter lock member 3 backward, and the shutter lock member 3 is moved to the first position. 2 Move the cartridge case 1 to the rear side against the elastic force of the shutter spring 8. As a result, the engagement between the engagement protrusion 76 formed on the shutter 2 and the shutter engaging portion 83 formed on the shutter lock member 3 is released, and the shutter 2 is opened by the elastic force of the first shutter spring 7. Become. The disk tray 4 can be taken out from the cartridge case 1 through the opening 1a and can be stored in the cartridge case 1 from the disk drive device.

  In the disc cartridge of this example, the step portion 63 is formed along the side portion of the disc tray 4, so that one disc tray 4 is accommodated in the cartridge case 1 as compared with the case where the step portion 63 is not provided. Therefore, it is possible to reduce the dimension in the thickness direction required for the disk, and to reduce the thickness of the disk cartridge or increase the number of the disk trays 4 to be stored. Further, in the disk cartridge of this example, the interval between the end faces of each stepped portion 63 is made smaller than the diameter of the peripheral wall 64 that constitutes the disk housing recess 61, and the outer portion 66 is held on the disk by the outer side than the end face of each stepped portion 63. Since the portion 65 is not formed, the leading end portions of the guide ribs 41 and 51 can be arranged from the peripheral wall 64 of the disc storage recess 61 to the inner peripheral portion, and the width direction dimension of the disc cartridge can be reduced. Furthermore, since the disc cartridge of this example has the projection 62 formed on the upper surface of the disc tray 4, the storability of the information recording disc 5 can be improved, and the height h 3 of the projection 62 and the level difference at the level difference 63. Since the total dimension with the size h4 is smaller than the thickness dimension of the guide ribs 41 and 51, the information recording disk 5 can be disposed at an intermediate position between the two guide ribs 41, 41 and 51, 51. 5 and the guide ribs 41 and 51 can be prevented from colliding with each other. In addition, the disc cartridge of this example has the thickness dimension of the disc tray 4 at the stepped portion 63 substantially equal to the thickness dimension of the information recording disc 5, so that two guide ribs 41, 41 and 51, which are arranged adjacent to each other, It is possible to minimize the interval between the 51 and minimize the size of the cartridge case 1 in the thickness direction.

  In addition, in the said embodiment, although the reverse gradient part 67 was formed as a drop prevention part of the information recording disc 5, the summary of this invention is not limited to this, as shown in FIG.34 and FIG.35, One to a plurality of (four in the example of FIG. 34) drop-off prevention protrusions 91 may be formed on a part of the peripheral wall 64 constituting the disk storage recess 61. As described above, when the drop prevention protrusion 91 is formed on the peripheral wall 64 as the drop prevention part, not only the case where the cartridge case 1 is placed vertically with the non-forming part 66 of the disk holding part 65 on the peripheral wall 64 facing up and down, Even when the cartridge case 1 is placed vertically with the non-forming portion 66 of the disc holding portion 65 directed in the left-right direction, the information recording disc 5 can be prevented from dropping from the disc tray 4, so that this type of disc cartridge can be further improved. Practicality and versatility are improved.

  Moreover, in the said embodiment, although the projection part 62 was formed in planar shape, the summary of this invention is not limited to this, It can form in arbitrary shapes, such as a rib shape or a protrusion shape. .

FIG. 4 is a perspective view when the disc cartridge is not used. It is a perspective view at the time of use of a disk cartridge. It is an exploded perspective view of a disk cartridge. It is a top view of an upper case. It is the front view seen from the front end side of the upper case. It is a bottom view of an upper case. It is a top view of a lower case. It is the front view seen from the front end side of the lower case. It is a bottom view of a lower case. It is the front view seen from the inner surface side of the left side plate. It is the side view seen from the front end side of the left side plate. It is the side view seen from the rear end side of the left side plate. It is a top view of a left side plate. It is a bottom view of a left side plate. It is the front view seen from the inner surface side of the right side plate. It is the side view seen from the rear end side of the right side plate. It is the side view seen from the front end side of the right side plate. It is a top view of a right side plate. It is a bottom view of a right side plate. It is a perspective view which shows the assembly method of the left side plate and the right side plate with respect to the assembly of an upper case and a lower case. It is principal part sectional drawing which shows the assembly state of the left side plate with respect to an upper case and a lower case, and the accommodation state of the disc tray in a cartridge case. It is a perspective view of a disk tray. It is explanatory drawing which shows the dimensional relationship of a disc tray and a guide rib. It is A section sectional drawing of FIG. It is B section sectional drawing of FIG. It is sectional drawing seen from the plane direction which shows the accommodation state of the disc tray in a cartridge case. FIG. 6 is a cross-sectional view of the main part viewed from the front end direction showing a state in which the disc tray is stored in the cartridge case. It is principal part sectional drawing which shows the effect of a reverse gradient part. It is the front view seen from the downward direction of a shutter. It is a front view of a shutter lock member. It is a side view of a shutter lock member. It is explanatory drawing which shows the opening / closing operation | movement of a shutter. It is explanatory drawing which shows the opening / closing operation | movement of a shutter. It is a perspective view of the disc tray concerning other embodiments. It is the C section enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cartridge case 1a Opening part 2 Shutter 3 Shutter lock member 4 Disc tray 5 Information recording disk 6 Management memory device 41,51 Guide rib 61 Disc storage recessed part 62 Projection part 63 Step part 64 Peripheral wall 65 Disc holding part 66 Disc holding part non- Forming part 67 Reverse gradient part 91 Holding projection

Claims (6)

A cartridge case having an opening, and a plurality of disk trays that are removably accommodated in the cartridge case through the opening, and on which an information recording disk is placed, the plurality of disk trays, In disc cartridges that are individually held by guide ribs formed at a predetermined pitch on the inner surface of the cartridge case,
The disc tray has a disc storage recess for storing the information recording disc, and step portions provided on both side surfaces of the disc tray corresponding to the guide rib, and the disc storage recess stores the information recording disc to be stored The disc storage unit includes a peripheral wall having a larger diameter and a disc holding portion for holding the information recording disc, and the interval between the step portions provided on both side surfaces of the disc tray is smaller than the diameter of the peripheral wall. A disc cartridge, wherein a concave portion and a part of the stepped portion are overlapped, and the overlapping portion is a non-formed portion of the disc holding portion.   2. The disc cartridge according to claim 1, wherein a protrusion for preventing contact between the information recording disc and another disc tray is formed at a non-step portion on the upper surface of the disc tray.   2. The disc cartridge according to claim 1, wherein a thickness dimension of the disc tray in the step portion is substantially equal to a thickness dimension of the information recording disc.   2. The disc cartridge according to claim 1, wherein a drop prevention portion for preventing the information recording disc from falling off is formed in the disc storage recess.   5. The anti-dropping portion is formed with a reverse slope portion in which a diameter of the peripheral wall increases from the opening surface side of the peripheral wall to the disk holding portion side in a part of the peripheral wall. Disc cartridge as described in 1.   5. The disc cartridge according to claim 4, wherein a drop prevention protrusion for the information recording disc is formed on a part of the peripheral wall as the drop prevention portion.

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