JP2671887B2 - Disc jacket - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc used in an information recording / reproducing apparatus for recording / reproducing image information or document information on a disc-shaped magnetic sheet or an optical disc. The present invention relates to a jacket, and more particularly to a disk jacket in which, when the disk jacket is inserted into a jacket holder of an information recording / reproducing apparatus, a shutter is automatically moved to open a head insertion hole and a center hole of the disk jacket. Things. 2. Description of the Related Art Conventionally, a magnetic disk for recording video information, document information, etc., or a disk jacket having an optical disk rotatably housed therein has been proposed for convenient handling and storage. I have. In this type of disc jacket, there is a so-called open disc jacket in which the window for the head is always open. However, since the window is always open, dust and the like come from this window. The window part can be opened and closed because it may invade the inside and adhere to the internal disk, or may accidentally attach a fingerprint or the like to the disk during handling and adversely affect recording and reproduction. Recently, a so-called automatic shutter-equipped disk jacket has been proposed in which a window is opened for the first time when a disk jacket is inserted into a jacket holder of an information recording / reproducing apparatus (hereinafter referred to as an apparatus) with a shutter disposed. It's been done. However, in the latter case as well, 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 exposed on the side of the jacket housing. An opening was formed, and it was inevitable that dust and the like would enter the inside of the jacket housing from a gap generated between the slider and the opening and adhere to the disk. Further, when the shutter is opened, it is difficult for the shutter piece to spread in the direction perpendicular to the sliding direction and it is difficult to maintain a good open / closed state. DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks, prevents dust and the like from entering from the outside during handling or storage, and deposits dust and the like on the disc. The objective is to prevent unnecessary expansion of the shutter, and to realize a common jacket and shutter opening / closing mechanism for double-sided discs with a simple mechanism. Is to provide. The disc jacket of the present invention comprises a jacket housing for rotatably accommodating a disc and having a head insertion hole and a center hole formed therein.
A shutter movably attached to the jacket housing; a slider for moving the shutter to open and close the head insertion hole and the center hole; and engaging the slider to move the shutter into the head insertion hole. And an elastic member that resiliently urges the center hole in a direction to close the center hole, forms a concentric circle with the center hole inside the jacket housing, and surrounds the entire outer periphery of the disk. A circular rib for regulating movement in the radial direction is provided, the slider and the elastic member are provided outside the circular rib, and the shutter is driven outside the circular rib. It is a feature. Further, the jacket housing is the shutter.
The moving range of the shutter has a concave structure,
The both ends in the moving direction are the locking members of the shutter.
In addition, a projecting piece is provided at an end contact portion of the U-shaped shutter of the jacket housing, the shutter end is housed in the projecting piece and the shutter end is slidably held, and the shutter is made of an elastic member. It is fixed to the slider, and has a projection for abutting a sliding mechanism at one end of the slider, and an opening for sliding the projection on the side surface of the jacket is provided on both side surfaces of the jacket. It is what According to the present invention, the disc center hole and the head insertion hole can be in contact with the outside only through the minimum two required holes, and the center hole and the head insertion hole can be completely closed by a shutter. Therefore, dust and the like do not enter from the outside of the jacket housing and adhere to the disk. In addition, even if abrasion powder of the inner surface of the jacket housing or the slider itself is generated due to the repetitive operation of opening and closing the shutter inside the jacket housing, the circular rib prevents entry into the disk storage unit. Abrasion powder does not adhere to the disk, and it is possible to always provide a disk with little dust and the like,
Not only can good recording and playback conditions be obtained,
This has the effect of extending the life of the disk. [0009] Further engaging the unnecessary spread of the shutter
It can be pressed down by the stop member and can be suppressed by the protruding piece , and the jacket can be assembled by combining the same parts with the double-sided disk, and the shutter opening / closing mechanism does not require distinction between double-sided and single-sided, While always achieving good shutter opening and closing ,
The center hole can be reliably closed when not in use . BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. First, the structure of the disk jacket will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a disk having a recording area 4 and non-recording areas 5 and 5 '. Is formed with an engagement hole 3 for rotational support. 4a
Indicates a recording range inside the recording area 4, and
b indicates the outer recording range. 2 is disk 1
Is the outer peripheral portion. On the other hand, as shown in FIG. 1, a jacket housing 7 for accommodating the disk 1 has an upper half 7 made of an injection-molded article such as an ABS resin containing an antistatic agent.
a and a lower half 7b, and outer peripheral portions of the upper half 7a and the lower half 7b and a rib portion described later are welded to each other to form a substantially rectangular parallelepiped shape as shown in FIG. Is done. The upper half 7a and the lower half b each have a circular center hole 8 substantially at the center, and the center hole 8 is concentric with the center hole 8 and the disk 1 is rotatable inside the jacket housing 7. A circular rib 11 surrounding the outer peripheral portion 2 of the disk 1 and a head insertion hole 10 for inserting a head to be described later are provided, and a first ring-shaped projection 9 is provided at a peripheral portion of the center hole 8. On the inner peripheral edge of the circular rib 11, second ring-shaped projections 12 are integrally formed on the inner surfaces of the upper half 7a and the lower half 7b, respectively. Reference numeral 13 denotes a concave portion formed by the first ring-shaped projection 9 and the second ring-shaped projection 12, and is provided opposite to the recording area 4 of the disk 1 described above. The recording area 4 is not directly in contact with the inner surface of the jacket housing 7. That is, the disk 1 is mounted on the first ring-shaped protrusion 9 and the second ring-shaped protrusion 12 and is rotatably stored in the jacket housing 7. 1 non-recording area 5
However, the non-recording area 5 ′ of the disc 1 abuts on the second ring-shaped projection 12, and the recording area 4 of the disc 1 is protected. Even if the disk 1 is offset and a part of the outer peripheral portion 2 of the disk 1 is held in contact with the inner peripheral surface 11 a of the circular rib 11, the recording area 4 is formed by the first ring-shaped protrusion. 9
And the first ring-shaped projection 12 so that the first
The outer peripheral portion 9a of the ring-shaped protrusion 9 and the inner peripheral portion 12a of the second ring-shaped protrusion 12 are formed. 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 disk 1, the upper half 7a and the lower half 7b, respectively, is as follows. . The outer peripheral portion 9a of the first ring-shaped protrusion 9 <the recording range 4a inside the disk 1 The recording range 4b outside the disk 1 <the inner circumference 12a of the second ring-shaped protrusion 12 <the disk 1 Outer peripheral portion 2 Outer peripheral portion 2 of disk 1 <Inner peripheral surface 11a of circular rib 11 Also, when cassette housing 7 is assembled by overlapping upper half 7a and lower half 7b with each other, upper half 7a
The circular rib 11 of the lower half 7b and the circular rib 11 of the lower half 7b contact each other to form the same circumferential surface, completely surrounding the disk 1, and the center hole 8 and the head insertion hole 10 are not opened. As far as possible, dust and the like from the outside are prevented from entering. Reference numeral 14 denotes an upper half 7a and a lower half 7 where the center hole 8 and the head insertion hole 10 are formed.
In FIG. 1, there are recesses provided on the outer surface of the housing b, and linear guide grooves 15 extending along side edges of the jacket housing 7 are formed. The guide groove 15
May be provided on either the upper half 7a or the lower half 7b. A protruding piece 16 is provided on the end 14a of the concave portion 14, and is integrally formed so that the cross section with the concave portion 14 becomes a U-shape. 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 as shown in FIG. 2 when the upper half 7a and the lower half 7b are assembled. An opening 47 is formed at the bottom. Reference numeral 18 denotes a shutter having a U-shaped cross section for opening and closing the center hole 8 and the head insertion hole 10, and is formed of, for example, stainless steel or synthetic resin. As shown in FIG. 2, the shutter 18 is slidably mounted in a predetermined direction in the recess 14 provided in the upper half 7a and the lower half 7b. That is, at least two or more semicircular projections 19 are formed on the shutter 18 corresponding to the guide grooves 15 provided in the concave portion 14 of the upper half 7a by pressing or integral molding as shown in FIG. The projections 19 are formed.
When the shutter 18 is inserted into the guide groove 15, the shutter 18 is guided by the guide groove 15, and is slidable in the directions of arrows A and B as shown in FIG.
Incidentally, the protrusion 19 may be formed in a V-shape or a U-shape. On the other hand, a slider 21 is disposed inside the shutter 18 as shown by a dashed line in FIG. 1, and protrusions 24 a and 24 formed on the slider 21 are provided.
b and bent pieces 20a and 20b provided at both ends of the side portion 18c of the shutter 18 are configured 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,
When the slider 21 moves so as to be sandwiched by the protrusions 24a and 24b, the shutter 18 moves in the same manner. 4 and 5 provided on the upper half 7a and the lower half 7b, respectively.
As shown in FIG. 2, the guide groove 26 is fitted and guided in a substantially right-angled guide groove 26 having a corner formed in an arc shape, and as shown in FIG.
And slidable in the D direction. In FIG. 1, the end of the slider 21 in the longitudinal direction is bent into an arc shape and shown, but this shows a state in which the slider 21 is fitted into the guide groove 26. The slider 21 is formed of an elastic member such as a leaf spring or vinyl chloride, for example, so as to be normally linear when detached from the slider 26. Therefore, the slider 21
Is slidable even if a part of the guide groove 26 is formed in an arc shape, and as shown in FIG.
If the projection 23 is formed at the front end of the housing and inserted into the opening 45 formed along the side plate of the jacket housing 7 by the upper half 7a and the lower half 7b, the projection 23 As shown in FIGS. 2 and 3, the shutter 18 is moved from the inside of the opening 45 to the outside. The shutter 18 can be moved in the direction of arrow A by engaging with a projection provided on a jacket holder described later. it can.
However, the protrusion 22 of the slider 21 has one end 2 of an elastic member 25 made of a stretchable spring or the like.
5a is locked, and a pin 27 integrally formed on the inner surface of the lower half 7b is connected to the other end 2 of the elastic member 25.
Since the slider 5b is locked, the slider 21 is constantly pulled in the direction of arrow B by the urging force of the elastic member 25. Accordingly, the shutter 18 is also simultaneously elastically urged in the direction of arrow B, so that 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 and the like from is prevented. The shutter 18 is
It can move in the direction of arrow B by the urging force of the elastic member 25.
However, there is a direct
The locking member 14c composed of the side portion of the wall provided at the corner is attached to the chassis.
When the side portion 18d of the ter 18 abuts, its movement is restricted.
Therefore, as shown in FIG. 2, the urging force of the elastic member 25 is
Thus, the side portion 18d of the shutter 18 is engaged with the concave portion 14.
It is locked and held by the stop member 14c. On the other hand, the end 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. 2 and 3, respectively. Even if a force is applied to push out the jacket housing 7 in any way, the end 18 a of the shutter 18 is configured to abut on the protruding piece 16. The configuration is such that the shutter 18 is prevented from spreading, and the center hole 8 and the head insertion hole 10 can be freely opened and closed in a good state at all times.
Further, the shutter 18 is provided on the outer side of the jacket housing 7 so that the bent pieces 20a and 20b of the shutter 18 are sandwiched between the protrusions 24a and 24b of the slider 21 exposed from the opening 47 of the jacket housing 7. Therefore, it can be easily attached to the jacket housing simply by inserting it into the concave portion 14 of the jacket housing 7. Reference numeral 46 denotes an opening which is provided opposite to the opening 45 and is symmetrical with the opening 45, and is necessary when the disk 1 is, for example, a so-called double-sided disk type which can be used on both sides. On the other hand, in the case of a so-called single-sided disk in which only one side of the disk 1 can be used, the opening 46 is unnecessary, but if so, at least two types of jacket housings are required depending on the type of disk (single-sided disk or double-sided disk). Therefore, it is impossible to share both jacket housings, and the jacket housings are expensive in terms of productivity and cost. Therefore, in the jacket housing of the present invention, FIG.
As shown in FIG.
5 and 46 are formed so that two types of disks, a single-sided disk and a double-sided disk, can be used in one type of jacket housing. The holes 40-43 and 44 are provided asymmetrically in the upper half 7a and the lower half 7b, respectively. The holes 40-43 are used particularly for disc type discrimination. Is done. The hole 42 is provided for discriminating between the single-sided disk and the double-sided disk described above. For example, when the hole 42 is left as it is, the hole 42 is formed as a single-sided disk. If 42 is closed, a double-sided disk is set, and it can be determined by operating a microswitch or the like. 40 and 41 were constructed in the same manner as above.
These three holes are used to newly discriminate three types of disks, namely, a recording-only disk, a reproduction-only disk, and an erasable disk. For example, a case where the hole 40 is closed and the hole 41 is left as it is is a recording-only disk, and a case where the hole 40 is closed and the hole 41 is closed is a reproduction-only disk, and a case where the holes 40 and 41 are closed respectively. An erasable disk may be used. 4
The hole No. 3 is a hole for preventing erroneous erasure, and the means for discrimination is the same as the above-mentioned method. However, 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.
Are integrally formed, and the hole 43 is provided in the recess 33.
The erroneous erasure prevention claw 35 that allows the user to freely open and close is inserted slidably. The erroneous erasure prevention claw 35 is provided with the grooves 34a, 3a.
4b, an arm 36 having a V-shaped protrusion 36a for positioning the erroneous erasure prevention claw 35 in the recess 33 is formed of, for example, an elastic synthetic resin. It is integrally molded. Further, as shown in FIG.
A hole 37 into which a pen tip such as a ball-point pen can be inserted is provided at a position facing the above, and the hole 37 is configured to be exposed to the outside through the long hole 44. The erroneous erasure prevention claw 35 is normally positioned in the recess 33 by the engagement of the protrusion 36 a with the groove 34 a, and closes the hole 43. The state at this time is set to, for example, a recordable state. If information is recorded on the disk and it is not necessary to save the information, or if it is not necessary to erase the information, the erroneous erasure preventing claw 35 is moved to open the hole. 43 may be configured to be open. In order to move the erroneous erasure prevention claw 35, a pen point such as a ball-point pen is inserted from the long hole 44 of the upper half 7a and the lower half 7b, and the erroneous erasure prevention disposed opposite the long hole 44 is performed. By fitting into the hole 37 of the claw 35 and pulling in the direction of the arrow E, the groove 34a and the protrusion 3
6a is disengaged, and the erroneous erasure prevention claw 35 is slid in the direction of the arrow E to open the hole 43. At this time, the projecting portion 36a of the erroneous erasure prevention claw 35 is configured to engage with the groove 34b.
Is positioned in a state where is opened. In this way, the erroneous erasure prevention claw 35 is moved. If the stored information becomes old or becomes unnecessary and needs to be replaced with new information, the reverse operation is performed to perform the erroneous erasure. The hole 43 may be closed again by moving the prevention claw 35 in the direction of arrow F. The width of the long hole 44 may be large enough to allow a pen tip such as a ball-point pen to be freely inserted as described above. For example, about 2 mm is sufficient. Thus, the erroneous erasure prevention claw 35 cannot be moved. Therefore, the erroneous erasure prevention claw 35 is not moved by mistake during handling or storage, so that information to be stored is not erased or information to be recorded is not recorded. Reference numeral 28 denotes an opening provided for the upper half 7a and the lower half 7b for discriminating the side of the double-sided disk. If a microswitch or the like is arranged at a position facing the opening 28, for example, FIG. As shown, when the jacket housing 7 is inserted, the micro switch is only inserted into the opening 28 and does not operate. But,
When the jacket housing 7 is inserted in a state of being turned upside down in FIG. 2, the microswitch is actuated by contacting the outer side of the jacket housing 7. At this time, if the former is the A side of the double-sided disc and the latter is the B side, the disc side can be determined. Reference numerals 31 and 32 denote positioning holes of the jacket housing 7 provided asymmetrically on the upper half 7a and the lower half 7b, respectively. The positioning holes 31 are substantially positive as reference holes when the jacket housing 7 is positioned. The holes and the 32 positioning holes are respectively formed as substantially auxiliary holes as auxiliary holes. Numeral 48 denotes a concave portion provided outside the upper half 7a and the lower half 7b.
A label indicating the contents of the record information is attached. Next, the operation of the disc jacket will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 2 shows the jacket housing 7 before being inserted into the apparatus. The center hole 8 and the head insertion hole 10 are completely closed by the shutter 18 so that dust and the like do not enter the jacket housing 7 from the outside. . With the label side of the jacket case 7 gripped and the shutter 18 side facing forward as indicated by the dashed line in FIG. 5, the jacket case 7 is moved from the jacket insertion hole 51 provided in the front panel 50 of the device 49 to the arrow G. The jacket housing 7 is inserted into the device 4 along the side walls 52 a and 52 b of the jacket insertion hole 51 and the jacket holder 52.
9 are inserted inside. The side walls 52a, 52b
Are formed with projection pieces 53a and 53b, respectively.
The shutter 18 is engaged with the projection 23 of the slider 21 exposed from the opening 45 of the jacket housing 7.
Is configured to be moved semi-automatically. Also,
Although the detailed description of the jacket holder 52 is omitted, the jacket holder 52 is configured to be movable only in the vertical direction (the directions of arrows H and I in FIG. 6) without moving in the insertion direction of the jacket housing 7. When the housing 7 is further inserted in the direction of arrow G, the protrusions 53a and 53b are inserted into the openings 45 and 46, respectively. Thereafter, when the protrusion 23 comes into contact with the protrusion 53a, the insertion of the protrusion 23 into the device 49 is stopped by the protrusion 53a, so that the jacket housing 7 is further inserted in the arrow G direction. The slider 21 is slid in the direction of arrow C in FIG.
8 also starts sliding in the direction of arrow A. When the shutter 18 starts sliding in the direction of arrow A, the center hole 8
8, the head insertion hole 10 is opened, and finally the center hole 8 and the head insertion hole 10 are completely opened as shown in FIG. At this time, for the first time, a head 54 for recording information on the disk 1 shown in FIG. 6 or reproducing the recorded information,
A disk motor 57 for rotating the disk 1 and a disk motor 57 (not shown)
The clamper or the like held above can be inserted. When the jacket housing 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 housing 7 is opened.
Is inserted into the jacket holder 52, as shown in FIG.
Is lowered in the direction of arrow H. Reference numeral 60 denotes a base provided inside the device 49. On the base 60, a positioning post for positioning the disk motor 57 and the head 54 or the jacket housing 7 at a predetermined position of the device 49 is provided. Microswitches 61 to 63 and the like provided for discriminating the type of the disc 1 are arranged at predetermined positions. The head 54 is integrally mounted on a head substrate 55 and is configured to be movable in the arrow J direction. 56 is the head substrate 5
5 is a guide shaft for guiding the head 54 in the direction of the arrow J by fitting with the head 5. As shown in FIG. 6, the positioning post 61 has a tip 62 formed in a conical shape 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 further descend 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 set 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 by a clamper (not shown) inserted through the center hole 8 of the upper half 7a, and is rotatable in the jacket housing 7. The microswitches 70 to 74 are also of the type of the disk 1. The switch which operates and the switch which does not operate appear, but these are detected at the same time and the disc 1 is determined. Here, the microswitches 70 and 71 are provided to face the holes 40 and 41 of the lower half 7b. For example, if the hole 40 is closed by a jig or the like and the hole 41 is left as it is, One end 75 of a pin 75 provided on the microswitch 70
a is pushed in the direction of arrow K because the hole 40 is closed, the microswitch 70 is connected to the other end 7 of the pin 75.
The switch is turned on by being operated by 5b. On the other hand, since the 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, so that the disc 1 is determined to be a recording-only disc. The microswitch 72 is used to discriminate a single-sided disk or a double-sided disk provided opposite the hole 42 of the lower half 7b. The microswitch 73 has an opening 2 in the lower half 7b.
8 and is configured to be directly operated by the jacket housing 7. In FIG. 6, the microswitch 73 has an opening 28.
The switch does not work because it is inserted into the switch
In this state, the disc 1 is determined to be the A side. Next, the microswitch 74 is provided for preventing erroneous erasure provided opposite to the hole 43 of the lower half 7b, and the switch is determined by whether the hole 43 is closed or opened by the erroneous prevention claw 35. ON / OFF is determined. Thereafter, 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 the arrow J, and information is recorded or reproduced. When the user presses the eject switch to take out the jacket housing 7 from the inside of the device 49, if a part of the jacket housing 7 is configured to protrude outside the front panel 50, the jacket housing 7 is manually operated thereafter. What is necessary is just to grasp the body 7 and pull it out. When the jacket housing 7 is pulled in the direction of the arrow L as shown in FIG. 5, the projections 23 are kept engaged with the projections 53 a of the jacket holder 52 by the urging force of the elastic member 25, as shown in FIG.
Starts moving in the direction of arrow D shown in FIG. At the same time, the shutter 18 also starts to move in the direction of arrow B,
When the jacket housing 7 is pulled out to a position where the engagement with the projection piece 53a is released, the shutter 18 is automatically moved to completely close the center hole 8 and the head insertion hole 10 as shown in FIG. Will close. Thereafter, the jacket housing 7 is completely removed from the device 49. Incidentally, even if the jacket housing 7 is erroneously inserted into the device 49 from the opposite side, the end of the jacket housing 7 will be
a, 53b, so that it cannot be inserted any further. As is apparent from the above description, according to the present invention, a circular rib surrounding the disk is provided, and a slider or an elastic member for moving the shutter is provided outside the circular rib. Since the members are disposed, the disk center hole and the head insertion hole are configured so that only the minimum required two holes are in contact with the outside, and the center hole and the head insertion hole are completely covered by the shutter. Since it is closed, dust or the like does not enter from the outside of the jacket housing and adhere to the disc even when the jacket is held or stored. In addition, even if abrasion powder of the inner surface of the jacket housing or the slider itself is generated due to the repetitive operation of opening and closing the shutter inside the jacket housing, the circular rib prevents entry into the disk storage unit. No wear powder adheres to the surface. Therefore,
It is possible to always provide a disk with little adhesion of dust and the like, and not only to obtain a good recording / reproducing state, but also to prolong the life of the disk. Further, by sliding the shutter in the projecting piece and arranging the opening for slider operation symmetrically, it is possible to suppress the unnecessary spread of the shutter by the projecting piece, and the locking member on the side of the concave portion. Yo
The position of the center hole is regulated by
In addition, it is not necessary to distinguish both sides and one side, and since the common upper and lower halves can be used, it is possible to make it inexpensive,
With respect to the shutter opening / closing mechanism, it is possible to realize an inexpensive and highly reliable shutter opening / closing mechanism that does not require a complicated mechanism only by providing slider contact projections on the left and right.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a configuration of a disc jacket of the present invention. FIG. 2 is a perspective view showing a state in which a shutter of the jacket is closed. FIG. FIG. 4 is a plan view of the jacket shown in FIG. 4. FIG. 5 is a plan view showing a partial cross section of the jacket when the jacket is inserted into the apparatus. FIG. FIG. 7 is a perspective view showing the configuration of the erroneous erasure prevention claw of the jacket. [Description of References] 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 discriminating hole 41 Disc type discriminating hole 42 Disc type discriminating hole 43 Erroneous erasure prevention hole 45 Open 46 opening

Claims (1)

(57) [Claims] A jacket housing in which a disk is rotatably housed and in which a head insertion hole and a disk rotation center hole are formed; and A shutter having a character shape and a slider for moving the shutter to open and close the head search hole and the center hole are provided, and the jacket housing has a concave structure in the moving range of the shutter, and the shutter having the concave structure is close
The side wall on the side is used as a locking member of the shutter, and a projecting piece is provided at an end contact portion of the U- shaped shutter of the jacket housing, and the shutter end is housed in the projecting piece. A disc jacket whose ends are held slidably in one direction. 2. The jacket casing is composed of upper half and lower half members, the shutter is arranged outside the jacket casing, the shutter is fixed to the slider made of an elastic member, and one end of the slider is The disc jacket according to claim 1, further comprising a protrusion for contacting the sliding mechanism, and an opening for sliding the protrusion on a side surface of the jacket. 3. The disc jacket according to claim 2, wherein the openings are provided on both side surfaces of the disc jacket.