JPH0719868U - Disc jacket - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object to provide a disc jacket having a structure in which dust and the like are unlikely to adhere to a disc for information recording / reproducing. A jacket housing 7 in which a disk 1 is rotatably accommodated and a head insertion hole 10 and a disk rotation center hole 8 are formed, and a U-shaped member movably attached to the jacket housing. The shutter 18, the slider 21 that moves the shutter to open and close the head insertion hole and the center hole, and the entire circumference of the outer circumference of the disk are enclosed inside the jacket housing to regulate the radial movement of the disk. By providing the circular rib 11 having a diameter slightly larger than the diameter of the disc, it is possible to provide a disc with less adhesion of dust and the like, obtain a good recording / reproducing state, and prolong the life of the disc. it can.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc jacket used for an information recording / reproducing apparatus for recording / reproducing image information or document information on a disc-shaped magnetic sheet or an optical disc, and in particular, the disc jacket is used as an information recording / reproducing device. This is related to the disc jacket in which the shutter is automatically moved when it is inserted into the jacket holder of the recording / reproducing apparatus to open the head insertion hole and the center hole of the disc jacket.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, for convenience of handling and storage, for example, a magnetic disk for recording video information and document information, or a disk jacket having an optical disk rotatably housed therein has been proposed. In this type of disc jacket, there is a so-called open type disc jacket in which the window for the head is always open.However, since the window is always open, dust is not released from this window. Opening and closing of the window part, etc. may enter the jacket and adhere to the internal disc, or the fingerprints may be accidentally attached to the disc during handling to adversely affect recording and reproduction. A so-called disc jacket with an automatic shutter in which the window is opened for the first time when the disc jacket is inserted into the jacket holder of an information recording / reproducing device (hereinafter referred to as the device) by arranging a shutter that can be freely moved. Has been proposed in recent years.

However, even in the latter case, although the window for inserting the head is normally closed by a shutter or the like, a part of the slider that allows the shutter to move is provided on the side of the jacket housing. It is inevitable that dust and the like will enter the inside of the jacket housing from the gap created between the slider and the opening and adhere to the disc. It was

[0004]

[Problems to be solved by the device]

 The present invention is intended to solve the above-mentioned drawbacks, prevent dust from entering from the outside during handling or storage, and prevent dust from adhering to the disc. Yes, it always seeks to provide good recording and playback conditions.

[0005]

[Means for Solving the Problems]

 The disc jacket of the present invention rotatably accommodates a disc and has a jacket housing having a head insertion hole and a center hole, a shutter movably attached to the jacket housing, and the shutter. A slider that moves to open and close the head insertion hole and the center hole; and an elastic member that engages with the slider and elastically biases the shutter in a direction to close the head insertion hole and the center hole. A circular rib that is concentric with the center hole and surrounds the entire outer peripheral portion of the disc and that restricts radial movement of the disc is provided inside the jacket housing. The slider and the elastic member are disposed outside the circular rib, and the shutter is driven outside the circular rib. Is shall.

[0006]

[Action]

 According to the present invention, the jacket is constructed so that the disc center hole and the head insertion hole are only in contact with the minimum required two holes, and the center hole and the head insertion hole are completely closed by a shutter. Dust and the like will not enter from the outside of the case and adhere to the disk. Also, even if abrasion powder of the inner surface of the jacket housing or the rider itself is generated by repeated opening and closing of the shutter inside the jacket housing, the circular ribs prevent entry into the disc storage section. Therefore, abrasion powder does not adhere to the disc, and it is possible to always provide a disc with little adhesion of dust and the like, so that not only a good recording and reproducing state can be obtained but also the life of the disc can be extended. It works.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

First, the structure of the disc jacket will be described with reference to FIGS. 1 to 4 and 7. In FIG. 1, reference numeral 1 is a disk having a recording area 4 and non-recording areas 5 and 5 ', and the disk 1 is engaged at the center with a drive unit of a disk motor described later. Engagement holes 3 for rotationally supporting the disk motor are formed. Reference numeral 4a denotes a recording area inside the recording area 4, and 4b denotes an outer recording area. Reference numeral 2 denotes an outer peripheral portion of the disc 1.

On the other hand, as shown in FIG. 1, the jacket casing 7 for accommodating the disc 1 includes an upper half 7a and a lower half 7b which are injection-molded products such as ABS resin containing an antistatic agent. The outer halves of the upper half 7a and the lower half 7b and the ribs described later are welded to each other to form a substantially rectangular parallelepiped shape as shown in FIG. A circular center hole 8 is provided in each of the upper half 7a and the lower half b in the center thereof, and the disk 1 is concentric with the center hole 8 and is rotatable in the jacket casing 7. A circular rib 11 that surrounds the outer peripheral portion 2 of the disk 1 and a head insertion hole 10 for inserting a head, which will be described later, are provided, and a first ring-shaped protrusion is provided on the peripheral portion of the center hole 8. Further, a second ring-shaped projection 12 is integrally formed on the inner peripheral edge of the circular rib 11 on the inner surfaces of the upper half 7a and the lower half 7b, respectively. Reference numeral 13 denotes a recess formed by the first ring-shaped protrusion 9 and the second ring-shaped protrusion 12, which is provided so as to face the recording area 4 of the disc 1 described above. The recording area 4 is configured so as not to directly contact the inner surface of the jacket housing 7. That is, the disc 1 is placed on the first ring-shaped protrusion 9 and the second ring-shaped protrusion 12 and is rotatably accommodated in the jacket housing 7. The non-recording area 5 of the disk 1 contacts the first ring-shaped protrusion 9 and the non-recording area 5'of the disk 1 contacts the second ring-shaped protrusion 12, respectively. Even if the disk 1 is biased and a part of the outer peripheral portion 2 of the disk 1 is held in contact with the inner peripheral surface 11a of the circular rib 11, the recording area 4 is protected. The outer peripheral portion 9a of the first ring-shaped protrusion 9 and the second ring-shaped protrusion 12 are arranged so that the region 4 does not contact the first ring-shaped protrusion 9 and the second ring-shaped protrusion 12. The inner peripheral portion 12a of is configured. That is, the relationship between the first ring-shaped protrusion 9, the second ring-shaped protrusion 12 and the circular rib 11 provided on the disc 1, the upper half 7a and the lower half 7b described above is as follows. Become.

Outer peripheral portion 9a of the first ring-shaped protrusion 9 <recording area 4a inside the disc 1 Recording area 4b outside the disc 1 <inner peripheral portion 12a of the second ring-shaped protrusion 12 <disk 1 Outer peripheral portion 2 Outer peripheral portion 2 of disk 1 <Inner peripheral surface 11a of circular rib 11 When the upper half 7a and the lower half 7b are placed on top of each other to form the cassette housing 7, the upper half 7a As long as the circular rib 11 and the circular rib 11 of the lower half 7b contact each other to form the same circumferential surface and completely surround the disk 1, the center hole 8 and the head insertion hole 10 are not opened. It is configured so that dust and the like from the outside will not enter.

Reference numerals 14 are concave portions provided on the outer surfaces of the upper half 7a and the lower half 7b, respectively, where the center hole 8 and the head insertion hole 10 are formed. As shown in FIG. A linear guide groove 15 extending along the side edge portion of 7 is formed. The guide groove 15 may be provided in either the upper half 7a or the lower half 7b. A projecting piece 16 is provided on the end 14a of the recess 14 and is integrally molded so that the cross section with the recess 14 is U-shaped. On the other hand, linear ribs 17 are formed on the inner surfaces of the upper half 7a and the lower half 7b, respectively, at the end 14b of the recess 14 and are shown in FIG. 2 when the upper half 7a and the lower half 7b are assembled. The opening 47 is configured as shown.

Reference numeral 18 denotes a shutter having a U-shaped cross section that opens and closes the center hole 8 and the head insertion hole 10, and is made of, for example, stainless steel or synthetic resin. As shown in FIG. 2, the shutter 18 is mounted slidably in a predetermined direction in the recesses 14 provided in the upper half 7a and the lower half 7b described above. That is, as shown in FIG. 1, the shutter 18 corresponding to the guide groove 15 provided in the concave portion 14 of the upper half 7a is formed by pressing or integral molding so that at least two semi-circular shapes are formed. A protrusion 19 is formed, and when the protrusion 19 is inserted and arranged in the guide groove 15, the shutter 18 is guided by the guide groove 15 and slides in the directions of arrows A and B as shown in FIG. It will be free. The protrusion 19 may be formed in a V shape or a U shape. On the other hand, inside the shutter 18, a slider 21 is arranged as shown by the one-dot chain line in FIG. 1, and the protrusions 24a and 24b formed on the slider 21 and both ends of the side portion 18c of the shutter 18 are arranged. The bending pieces 20a and 20b provided on the above are configured so as to be integrally movable. That is, when the bent pieces 20a and 20b of the shutter 18 are inserted between the protrusions 24a and 24b of the slider 21, the bent pieces 20a and 20b are sandwiched by the protrusions 24a and 24b. When is moved, the shutter 18 is also moved in the same manner. In addition, the end portions 21a and 21b of the slider 21 are formed in the upper half 7a and the lower half 7b, respectively, and each of which has a substantially right angle guide groove 26 which is formed in an arc shape as shown in FIG. 4 or 5. And is guided by it, and is configured to be slidable in the directions of arrows C and D as shown in FIG. In FIG. 1, the longitudinal end of the slider 21 is bent into an arc shape, but it is shown that it is fitted in the guide groove 26. The slider 21 is constituted by an elastic member such as a leaf spring or vinyl chloride so that the slider 21 is normally linear when removed from the groove 26. Therefore, the slider 21 is slidable even if a part of the guide groove 26 is formed in an arc shape. Therefore, as shown in FIG. 1, a protrusion 23 is formed at the tip end of the slider 21. If the upper half 7a and the lower half 7b are configured to be inserted into the opening 45 formed along the side plate of the jacket housing 7, the protrusion 23 is formed as described above as shown in FIGS. Since it is exposed from the inside of the opening 45 to the outside, the shutter 18 can be moved in the arrow A direction by engaging with a projection piece provided on a jacket holder described later. However, one end 25a of an elastic member 25 made of, for example, a tension spring is telescopically locked to the protrusion 22 of the slider 21, and the pin 27 integrally formed on the inner surface of the lower half 7b has a pin 27. Since the other end 25b of the elastic member 25 is locked, the slider 21 is always pulled in the direction of arrow B by the urging force of the elastic member 25. Therefore, since the shutter 18 is also elastically urged in the direction of the arrow B, the center hole 8 and the head insertion hole 10 are always completely closed by the shutter 18 as shown in FIG. Intrusion of dust from the inside is prevented. The side portion of the shutter 18 is engaged with the side portion 14c of the concave portion 14, is stopped at the position shown in FIG. 2, and is prevented from moving in the direction of arrow B in FIG. It is like this. On the other hand, the end portion 18a of the shutter 18 is slidably inserted inside the protruding pieces 16 provided on the upper half 7a and the lower half 7b as shown in FIGS. The shutter 18 is configured so that the end 18a of the shutter 18 contacts the protruding piece 16 even if a force is exerted that pushes the shutter 18 toward the outside of the jacket housing 7 in some way. The shutter 18 is prevented from spreading at all times, and the center hole 8 and the head insertion hole 10 are always opened and closed in good condition. Further, the shutter 18 has a structure in which the bent pieces 20 a and 20 b of the shutter 18 are sandwiched between the protrusions 24 a and 24 b of the slider 21 exposed from the opening 47 of the jacket housing 7. It can be easily attached to the jacket housing simply by inserting it into the recess 14 of the jacket housing 7 from the outside.

Reference numeral 46 denotes an opening provided opposite to the opening 45 and symmetrical to the opening 45, and is necessary when the disk 1 is of a so-called double-sided disk type capable of being used on both sides. On the other hand, in the case of a so-called single-sided disc in which only one side of the disc 1 can be used, the opening 46 is not necessary, but if so, at least two types of jacket housings are provided depending on the type of disc (single-sided disc or double-sided disc). Since it becomes necessary, it becomes impossible to share the two jacket housings, and the jacket housing becomes expensive in terms of productivity and cost. Therefore, in the jacket housing of the present proposal, as shown in FIGS. 2 and 3, openings 45 and 46 are formed on both sides of the jacket housing 7 so that one kind of jacket housing has a single-sided disk. Or, it is configured so that two types of disks, a double-sided disk, can be used.

The holes 40 to 43 and the long holes 44 are provided asymmetrically in the upper half 7 a and the lower half 7 b, respectively. The holes 40 to 43 are especially used for discriminating the type of the disc 1. Used as. The hole 42 is provided to identify the above-mentioned single-sided disk or double-sided disk. For example, when the hole 42 is left as it is, it is a single-sided disk, or although not shown, a jig or the like is used. If the hole 42 is blocked, it can be identified by operating a microswitch or the like by setting a double-sided disk. The holes 40 and 41 are constructed in the same manner as above, and three kinds of discs are newly discriminated as a disc type: a record-only disc, a read-only disc, or an erasable disc. . For example, when the hole 40 is closed and the hole 41 is left as it is, the recording-only disc is used. Conversely, when the hole 40 is left closed and the hole 41 is left as it is, the read-only disc is used, and the holes 40 and 41 are closed respectively. The case may be an erasable disc. The hole 43 is a hole for preventing erroneous erasure and is the same as the above-mentioned method as a means for discrimination, but the inside of the hole 43 (the inside of the upper half 7a and the lower half 7b) is shown in FIG. As shown in FIG. 7, a concave portion 33 having V-shaped grooves 34a and 34b is integrally formed, and an erroneous erasure prevention claw 35 for freely opening and closing the hole 43 is slidable in the concave portion 33. Has been inserted into. The erroneous erasure prevention claw 35 includes an arm 36 having a V-shaped protrusion 36a for engaging the grooves 34a and 34b and positioning the erroneous erasure prevention claw 35 in the recess 33. However, they are integrally formed of, for example, a synthetic resin having elasticity. Further, as shown in FIG. 7, the erroneous erasure prevention claw 35 is provided with a hole 37 in which a pen tip such as a ballpoint pen can be inserted, at a position facing the elongated hole 44. 37 is configured to be exposed to the outside. The erroneous erasure prevention claw 35 is normally positioned in the recess 33 by engaging the protrusion 36a with the groove 34a, and closes the hole 43. The state at this time is set to, for example, a recordable state, and when the information is recorded on the disc and the information is not stored or erased, the erroneous erasure prevention claw 35 is moved. The hole 43 may be opened. In order to move the erroneous erasure prevention claw 35, a pen tip such as a ballpoint pen is inserted through the long holes 44 of the upper half 7a and the lower half 7b, and the erroneous erasure prevention is arranged facing the long hole 44. When it is fitted in the hole 37 of the claw 35 and pulled in the direction of arrow E, the engagement between the groove 34a and the protrusion 36a is released, and the accidental erasure prevention claw 35 is slid in the direction of arrow E to move the hole. 43 is open. At this time, the protrusion 36a of the erroneous erasure prevention claw 35 is configured to engage with the groove 34b, and the erroneous erasure prevention claw 35 is positioned with the hole 43 open. In this way, the erroneous erasure prevention claw 35 is moved, and when the stored information becomes old or unnecessary and needs to be replaced with new information, the reverse operation is performed. The erroneous erasure prevention claw 35 may be moved in the direction of arrow F to close the hole 43 again. It should be noted that the width of the long hole 44 may be such that the tip of a pen such as a ballpoint pen can be freely inserted, as described above. For example, the erroneous erasure prevention claw 35 cannot be moved. Therefore, the erroneous erasure prevention claw 35 is not accidentally moved during handling or storage, so that the information to be stored is not erased or the information to be recorded is not recorded. Reference numeral 28 denotes openings provided to face the upper half 7a and the lower half 7b, respectively, for side discrimination of the double-sided disc. If a microswitch or the like is arranged at a position facing the opening 28, for example, as shown in FIG. As shown, if the jacket casing 7 is inserted, the micro switch is merely inserted into the opening 28 and does not operate. However, when the jacket casing 7 is inserted in the state of being turned upside down in FIG. 2, the micro switch is brought into contact with the outer side portion of the jacket casing 7 and operated. At this time, if the former is, for example, the A side of the double-sided disc and the latter is the B side, the disc side can be discriminated. Numerals 31 and 32 are positioning holes of the jacket housing 7 provided asymmetrically in the upper half 7a and the lower half 7b, respectively. The positioning holes of 31 are substantially positive as reference holes when positioning the jacket housing 7. The hole and the 32 positioning holes are formed as auxiliary holes in a substantially long hole. Reference numeral 48 is a concave portion provided outside the upper half 7a and the lower half 7b, and in the concave portion 48, a label (not shown) for displaying the contents such as recorded information of the disc 1 is attached. . Next, the operation of the disc jacket will be described with reference to FIGS. 2 and 5 to 6. FIG. 2 shows the jacket housing 7 before being inserted into the apparatus, and the center hole 8 and the head insertion hole 10 are completely closed by a shutter 18 so that dust and the like do not enter the jacket housing 7 from the outside. It Grasping the label side of the jacket casing 7 and putting the jacket casing 7 through the jacket insertion hole 51 provided in the front panel 50 of the device 49 with the shutter 18 side as the front side as shown by the one-dot chain line in FIG. As it is inserted in the direction of arrow G, the jacket housing 7 is inserted into the device 49 along the jacket insertion hole 51 and the side walls 52a and 52b of the jacket holder 52. Projecting pieces 53a and 53b are formed on the side walls 52a and 52b, respectively, and are engaged with the projecting portion 23 of the slider 21 exposed through the opening 45 of the jacket housing 7 to open the shutter 18. It is configured to move semi-automatically. Although not described in detail, the jacket holder 52 does not move in the insertion direction of the jacket housing 7 but can move only in the vertical direction (arrows H and I in FIG. 6). When the jacket housing 7 is further inserted in the direction of arrow G, the protruding pieces 53a and 53b are inserted into the openings 45 and 46, respectively. After that, when the protrusion 23 comes into contact with the protrusion 53a, the protrusion 23a stops the insertion of the protrusion 23 into the inside of the apparatus 49, so that the jacket housing 7 is further inserted in the direction of arrow G. Then, the slider 21 becomes in a state of sliding in the direction of arrow C in FIG. 2, and accordingly, the shutter 18 also starts sliding in the direction of arrow A. When the shutter 18 begins to slide in the direction of arrow A, the center hole 8 is opened from the shutter 18, the head insertion hole 10 is then opened, and finally the center hole 8 is opened as shown in FIG. And the head insertion hole 10 is completely opened. At this time, for the first time, the head 54 for recording information on the disc 1 shown in FIG. 6 or reproducing the recorded information, the disc motor 57 for rotating the disc 1, and the disc 1 (not shown) A clamper or the like held on the disk motor 57 can be inserted. When the jacket casing 7 is inserted into the jacket holder 52 as shown in FIG. 5 and the center hole 8 and the head insertion hole 10 are completely opened, the jacket casing 7 is inserted into the jacket holder 52. As it is, it is lowered in the direction of arrow H in FIG. Reference numeral 60 denotes a base provided inside the device 49. On the base 60, positioning for positioning the disk motor 57 and the head 54 or the jacket housing 7 at a predetermined position of the device 49 is performed. Posts 61 and 63 and micro switches 70 to 74 provided for discriminating the type of the disk 1 are arranged at predetermined positions. The head 54 is integrally mounted on a head substrate 55 and is movable in the arrow J direction. Reference numeral 56 denotes a guide shaft which is fitted to the head substrate 55 and guides the head 54 in the arrow J direction. Further, the positioning post 61 has a conical tip 62 as shown in FIG. 6, and is configured so that the positioning holes 31 and 32 of the jacket housing 7 can be easily inserted. On the other hand, the positioning post 63 has a flat tip, and contacts the outside of the jacket housing 7 so that the jacket housing 7 positioned by the positioning post 61 does not descend further from the predetermined position in the arrow H direction. It is configured to block. Therefore, when the jacket housing 7 is lowered and the jacket housing 7 is installed inside the device 49 by the positioning posts 61 and 63, the disk 1 is inserted into the center hole 8 of the lower half 7b. Although not shown, it is held on the motor 57 by a clamper inserted through the center hole 8 of the upper half 7a, and is rotatable in the jacket housing 7. In addition, the microswitches 70 to 74 described above are also supported. Depending on the type of the disc 1, some switches are activated and some are not, but they are detected simultaneously and the disc 1 is discriminated. Here, the microswitches 70 and 71 are provided so as to face the holes 40 and 41 of the lower half 7b. For example, if the hole 40 is closed by a jig and the hole 41 is left as it is, Since one end 75a of the pin 75 provided on the micro switch 70 is pushed in the direction of arrow K because the hole 40 is closed, the micro switch 70 is operated by the other end 75b of the pin 75 to switch the switch. Turns on. On the other hand, in the micro switch 71, since one end 75a of the pin 75 is inserted into the hole 41, the micro switch 71 does not operate and the switch is in the OFF state. Therefore, this disc 1 is discriminated as a record-only disc. To be done. The micro switch 72 is for identifying whether it is a single-sided disk or a double-sided disk provided in opposition to the hole 42 of the lower half 7b, and is turned on / off depending on the state of the hole 42. The micro switch 73 is for side discrimination provided facing the opening 28 of the lower half 7b, and is configured to be directly operated by the jacket housing 7. In FIG. Since the disk 73 is inserted into the opening 28 and does not operate and the switch is in the OFF state, the disk 1 is determined to be the A surface. Next, a micro switch 74 is provided for preventing erroneous erasure provided in correspondence to the hole of 43 of the lower half 7b. Depending on whether the hole 43 is closed or opened by the erroneous erasure prevention claw 35, a switch is provided. Is turned on / off and is discriminated. Then, when the disk 1 is rotated by the disk motor 57, the head 54 inserted into the head insertion hole 10 of the lower half 7b is moved in the direction of arrow J, and information is recorded or reproduced. . If the eject switch is pressed when the jacket housing 7 is taken out from the inside of the device 49, a part of the jacket housing 7 can be projected outside the front panel 50. It suffices to grasp the housing 7 and pull it out. When the jacket casing 7 is pulled in the direction of the arrow L as shown in FIG. 5, the protrusion 23 remains engaged with the protrusion piece 53a of the jacket holder 52 by the urging force of the elastic member 25, and the arrow shown in FIG. Start moving in the D direction. At the same time, the shutter 18 also starts moving in the direction of the arrow B, and when the jacket housing 7 is pulled out to a position where the protrusion 23 and the protrusion piece 53a are disengaged, the shutter 18 automatically moves. To completely close the center hole 8 and the head insertion hole 10 as shown in FIG. After that, the jacket housing 7 is completely taken out from the device 49. Even if the jacket housing 7 is accidentally inserted into the device 49 from the opposite side, the end portion of the jacket housing 7 may not come into contact with the projecting pieces 53a and 53b provided on the jacket holder 52. The above is configured so that it cannot be inserted.

[0015]

[Effect of device]

 As is apparent from the above description, according to the present invention, the circular rib surrounding the disc is provided, and the slider or the elastic member for moving the shutter is arranged outside the circular rib. The disk center hole and the head insertion hole are configured so that only the minimum necessary two holes are in contact with the outside, and the center hole and the head insertion hole are completely closed by a shutter. Therefore, even when the jacket is handled or stored, the dust or the like does not enter from the outside of the jacket housing and adhere to the disc. In addition, even if abrasion powder is generated on the inner surface of the jacket housing or the slider itself due to repeated opening and closing of the shutter inside the jacket housing, the circular rib prevents the powder from entering the disk storage section. As a result, abrasion powder does not adhere to the disc. Therefore, it is possible to always provide a disk with less dust and the like, and it is possible not only to obtain a good recording / reproducing state, but also to prolong the life of the disk.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing the structure of a disc jacket of the present invention.

FIG. 2 is a perspective view showing a state where a shutter of the jacket is closed.

FIG. 3 is a perspective view showing a state in which the shutter is open.

FIG. 4 is a plan view of the jacket.

FIG. 5 is a plan view showing a state in which the jacket is inserted into the apparatus in a partial cross section.

FIG. 6 is a perspective view showing a state in which the jacket is positioned in the apparatus.

FIG. 7 is a perspective view showing a structure of an erroneous erasure prevention claw of the jacket.

[Explanation of symbols]

 1 Disc 7 Jacket Housing 8 Center Hole 10 Head Insertion Hole 11 Circular Rib 16 Projecting Piece 18 Shutter 21 Slider 25 Elastic Member 31 Positioning Hole 32 Positioning Hole 40 Disc Type Discrimination Hole 41 Disc Type Discrimination Hole 42 Disc Type discrimination hole 43 Erase prevention hole 45 Opening 46 Opening

Claims (4)

[Scope of utility model registration request] 1. A jacket housing in which a disk is rotatably housed and a head insertion hole and a disk rotation center hole are formed, and a U-shaped shutter movably attached to the jacket housing. And a slider for moving the shutter to open and close the head insertion hole and the center hole, the inside of the jacket casing forming a concentric circle with the center hole, and the entire outer peripheral portion of the disk. A disc jacket, which is provided with a circular rib having a diameter slightly larger than the diameter of the disc so as to surround the circumference and regulate the movement of the disc in the radial direction. 2. The disc jacket according to claim 1, further comprising a first ring-shaped protrusion at a position facing the inner peripheral non-recording area of the disc at the peripheral edge of the center hole. 3. The disc jacket according to claim 2, further comprising a second ring-shaped protrusion at a position facing an outer peripheral non-recording area of the disc at an inner peripheral edge of the circular rib. 4. The jacket casing is made up of upper half and lower half members having the substantially symmetrical circular rib structure,
The slider is disposed outside the circular rib, the shutter is disposed outside the jacket housing, the shutter and the slider are driven outside the circular rib, and 3. The circular ribs of the halves contact, and the first and second ring-shaped protrusions have a space between the upper and lower halves to rotatably mount the disc. Disc jacket described in 3.