TW200303529A - Disk cartridge - Google Patents

Abstract

A disk cartridge includes a case for accommodating a disk, a cover, installed at the case to be capable of being open and shut and having an open hole formed therein open to the outside, a shutter, installed under the disk in the case to be capable of moving, for opening/shutting an opening hole formed in the case; and a clamping member, installed at the cover to seal the open hole, for clamping the disk. Thus, since the clamping member blocks the hole of the cover connected to the outside, the possibility of intrusion of dust into the disk cartridge is reduced. Also, since there is no need to installed the clamping member at the disk drive, the disk drive can be made simplified and slim.

Description

200303529 V. Description of the invention (1) The technical field to which the invention belongs θ The present invention relates to a disc cartridge, and in particular, to a kind of disc cartridge used to protect a recording surface of an accommodated disc. Protect data recording / copying media from contamination such as dust or fingerprints. Prior art Generally speaking, a disc cartridge holds a disc, that is, a data recording / reproducing medium, and is disposed in a disc drive device. Please refer to Figure 1, which is a perspective view of a conventional disc cartridge. The conventional disc cartridge 100 includes a housing (856) 101, a movable shutter (311111 ^ 61 ') 110, and a cover 103. The casing 101 is used to receive the disc D. The movable shutter 110 is disposed in the housing 101, and can be rotated to selectively open or close an opening hole 102 located on the housing, so that the read / write head (not shown) of the disc drive device can Approach disc D. The upper cover 103 is fixed to the upper portion of the casing 101. Reference numeral 103b refers to an open hole in the upper cover 103 for replacing and clamping the disc D. The reference numeral 1 〇 3 a refers to a detachment prevention lever (e s c a p e prevention lever), which is arranged on the upper cover 103 and can be slid to prevent the disc D from passing through the opening 103 b. Therefore, when the disc D is placed, the detachment prevention lever 103a is pulled backward without hindering the disc d. After the disc D is properly placed, the detachment prevention lever 1038 is pushed forward so that the front end of the detachment prevention lever 103a can prevent the disc d from passing through the opening 103b. Please refer to FIG. 2A, which is a plan view of the closed state of the movable shutter of the conventional disc cartridge of FIG. When the disc cartridge 1 containing the disc D is inserted into the disc drive device, an opening lever (12) disposed on the disc drive device is pushed first, and a locking piece (nocking piece) is pushed.

10821pif.ptd Page 10 200303529 V. Description of the invention (2) The protrusion 110 of the movable shutter 110 is released from the groove 101a on the casing 101. Next, as shown in FIG. 2B, FIG. 2B is a plan view of the opened state of the movable shutter of the conventional disc cartridge of FIG. The opening lever 1 2 0 pushes away the blocking piece (i n t e r f e r e n c e p c e c e) 1 1 1 b to pivot the movable shutter 110 about the left and right pivot axes 110 a. The movable shutter 1 1 0 of this conventional technique is composed of a first movable shutter portion 111 and a second movable shutter portion 112, and the first movable shutter portion 111 The second movable shutter portion 1 1 2 is arranged to rotate on the rotation shaft 1 10a, and is engaged with each other by an engagement gear portion 113. When the first movable shutter portion 1 1 1 is connected to the blocking sheet 1 1 1 b and rotated clockwise, the second movable shutter portion 1 1 2 is rotated counterclockwise, so that the first movable shutter portion The 1 1 1 and the second movable shutter portion 1 1 2 can be separated from each other to open the hole 10 2. Next, the rotating disk (not shown) and the clamp (not shown) of the disc driving device can pass through the holes 1 0 2 and the opening 1 0 3 b (shown in FIG. 1) to clamp the disc D, respectively. . The read / write head (not shown) of the disc drive can then be brought close to the recording surface of disc D for data recording and / or copying procedures. Although not shown in the drawing, a torsion spring (t 〇rsi ο η s ρ ri η g) elastically biases the first movable shutter portion 1 1 1 in a counterclockwise direction in the drawing, that is, to close the hole 1 0 2 direction. This torsion spring is disposed between the first movable shutter portion 111 and the bottom surface of the casing 101. Therefore, when the force applied to the opening lever 120 is removed, the movable shutter 110 returns to the original closed position. However, under the above structure, dust can pass through the opening of the upper cover 103

l〇821pif.ptd Page 11 200303529 V. Description of the invention (3) 1 0 3 b invasion, of course, since the upper surface of the disc D facing the opening 10 3 b is not its recording surface, it will not be directly contaminated by dust. occur. However, when dust enters and accumulates on the movable shutter 1 1 0, the dust accumulated on the movable shutter 1 1 0 will still be opened on the movable shutter 1 1 0, and attached to the disc D during the operation. Record surface. Furthermore, if the moving shutter 110 is not held down, the recordability of the recording surface of the disc D may be very dusty. In addition, because the movable shutter 1 10 is disposed inside the body 10 1 'and the disc D is placed on the movable shutter 1 1 0. When the movable shutter 1 10 is opened or closed, the movable shutter 1 10 will contact the recording surface of the disc D (that is, the lower surface of the disc in the drawing), so the recording surface of the disc D may suffer The movable shutter 1 1 0 is scratched and damaged. Furthermore, under the above-mentioned structure, when the movable shutter 110 is strongly pressed by the transmission hole 102 in a closed state, the movable shutter is easily deformed. That is, since each of the first and second movable shutter portions 1 1 1 and 1 1 2 is engaged and supported at one end and can pivot about the rotation axis 110a, when the user presses the movement through the hole 10 2 At the other end of the shutter 1 1 0, the movable shutter is easily deformed. As a result, the opening / closing operation is not smoothly performed. If the opening / closing operation is carried out smoothly, the gap between the first and second movable shutters 1 1 1 and 1 1 2 can be prevented and the function of the movable shutter can be prevented. Therefore, by preventing the movable shutter 110 from being deformed and dust from intruding, and also protecting the recording surface of the disc D, an improved structure of the disc cartridge is required by the industry. Summary of the invention

200303529 V. Description of the invention (4) An improved disc cartridge can prevent dust from intruding into the casing, so when the movable shutter is opened / closed, the recording surface of the disc can be protected, and it can be prevented from external forces. Cause deformation of the movable shutter to keep the disc more stable. To achieve the above object, the present invention provides a disc cartridge including a casing, a casing cover, a movable shutter, and a clamp member. The casing is used to receive the disc. The cover is arranged on the casing and can be opened and closed, and has an opening therein to open to the outside. A movable shutter is arranged in the casing and is located under the disc and is movable to open / close a hole in the casing. And a clamp member is arranged on the shell cover to seal the opening for clamping the disc. In order to achieve the above object, the present invention provides a disc cartridge including a casing, a casing cover, a movable shutter and a clamp member. The casing is used for accommodating a disc. The cover is arranged on the upper surface of the shell and can be opened and closed to seal the upper surface of the shell; the movable shutter is arranged in the shell and is under the disc and can be moved to open / close the shell A hole in the body. The clamping member is arranged on the inner surface of the cover for clamping the disc. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments in detail with the accompanying drawings, as follows: Figures 3 and 4 of the implementation mode It is a diagram of a disassembled and assembled state of a disc cartridge in a preferred embodiment of the present invention. Please refer to FIG. 3 and FIG. 4. The disc cartridge of the present invention includes a housing 201, a movable shutter 210, a housing cover 203, and

10821pif.ptd Page 13 200303529 V. Description of the invention (5) Clamping member 240. The housing 201 is used for accommodating a disc D ° movable shutter 2 1 0 is used for opening / closing a hole 202 disposed in the housing 201 and below the disc. The cover 20 03 is used to cover the upper surface of the casing 20 01. The clamp member 2 4 0 is disposed on the housing cover 230 to seal an opening 2 3a. In this embodiment, the clamp member 2 4 0 has a clamp like a clamp of a conventional disc driving device. Function, and at the same time has the function of tightly blocking the opening 203a. That is, in the structure of the present invention, a member having a clamp function is arranged on the housing cover 230 instead of the disc drive, and at the same time has a function of sealing the opening 230a. The jaw member 240 will be described in detail below. Next, the movable shutter 2 10 is composed of first and second movable shutter portions 2 1 1 and 2 1 2, which are arranged in the casing 2 1 1 and can be pivoted symmetrically. Therefore, when the first and second movable shutter portions 2 1 1 and 2 1 2 are separated from each other, the hole 2 0 2 is opened (refer to FIG. 6). When the first and second movable shutter portions 2 1 1 and 2 1 2 pivot in opposite directions, that is, directions close to each other, the hole 2 02 will be closed (see FIG. 5). Reference numeral 2 1 3 refers to a connection portion for causing the first and second movable shutter portions 2 1 1 and 212 to interact with each other. Thus, when the first movable shutter portion 2 1 1 is pivoted, the second movable shutter portion 2 1 2 is pivoted in the opposite direction by the joint portion 2 1 3. A torsion spring 404 elastically biases the first and second movable shutter portions 211 and 212 in a direction closing the hole 202. The torsion spring 204 is disposed between the bottom surface of the lower case 201 and the female first and second movable shutter portions 2 1 1 and 2 1 2. So when applied to the opening

l〇82lpif > pt (j page 14 200303529 V. Description of the invention (6) After the force of the rod 1 2 0 is removed, the movable shutter 2 1 0 returns to the original closed position. It is respectively arranged at the first and second activities. The projections 230 and 220 on the shutter portion 2 1 1 and 2 1 2 will contact the peripheral edge portion D3 of the disc D, that is, the clamp area D 1 including the inner periphery of the disc D, and the data area for recording data. D 2 and the edge portion D3 located outside the data area D2. Because the edge portion D 3 supported by the protrusions 23 and 220 is one of the non-data areas, it can be avoided between the data area D2 and the movable shield 210 The projections 2 2 0 and 2 3 0 have inclined surfaces 2 2 1 and 2 3 1 respectively, and the center of the disc D received diagonally. Therefore, as shown in FIG. 5, when the first and second movements The shutter portions 2 1 1 and 2 1 2 are closed, and the edge portion D3 of the disc D is supported by the upper ends of the protrusions 220 and 230. When the first and second movable shutter portions 2 1 1 and 2 1 2 are opened, As shown in FIG. 6, the disc D will be lowered along the inclined surfaces 2 2 1 and 2 3 1. The clamping area D1 of the inner periphery of the lowered disc D is supported by the protrusion 205 located on the housing 201. When the movable shutter 2 10 is closed, the disc D rises and the clamp member 240 tightly contacts its clamp area D1, as shown in Fig. 5. Moreover, the support member 2 0 7 is arranged at every + One m cuts the lower surfaces of the plate portions 2 1 1 and 2 1 2, that is, the other opposite surface of the surface that accommodates the disc d, so that the support member 207 is inserted into the bow in the housing 201 and the guide narrows. Guide slot 2 0 6 and can slide. When the first and second flap parts 2 1 1 and 2 1 2 are pivoted, the guide slot 2 0 β is along the support structure, 2 0 7 The moving track is formed. Therefore, during the opening and closing operations of the first and second activities 2 1 1 and 2 1 2, the support member 2 07 slides along the guide narrow °. The end portion 2007 of the support member 2 07 Insert the guide slit 206,

10821pif.ptd Page 15 200303529 V. Description of the invention (7) The contact portion 206a of the guide slit 206 is stuck, as shown in FIG. Therefore, when an external force is applied to the movable shutter 2 in the direction of the arrow F, the end portion 2 7 a is guided by the contact portion 2 0 6 a of the slit 2 0 6, and the case 2 can be prevented. The movable shutter 2 in 0 1 is deformed inward. At this time, 'although the end portion 207a may be arranged on the projecting housing 201, the receiving portion 2 6b connected to the guide slit 2 0 6 is preferably arranged in the housing 2 0 1' such that the end portion 207a It does not protrude above the outer surface of the housing 201, as shown in FIG. Coupling protrusions 211a and coupling grooves 212a are bonded together 'are formed at positions where the first movable shutter portion 2 1 1 and the second movable shutter portion 2 1 2 are closely joined, respectively, as in the first Figure 8 shows. When the first movable shutter portion 211 and the second movable shutter portion 212 are in close contact with each other to close the hole 202, the bonding protrusion 2 1 1 a and the bonding groove 2 1 2 a are tightly bonded to each other, at this time When an external force is applied to the movable shutter 2 1 0 in the direction of the F arrow, the deformation of the movable shutter 2 1 0 can be reduced compared to the case where the first movable shutter unit 2 11 and the second movable shutter unit 2 1 2 are separated. Possibility. Of course, the engaging protrusion 2 1 1 a may be formed on the second movable shutter unit 212, and the engaging groove 212 a may be formed on the ‘first movable shutter unit 21 1. 'The clamp member 2 40 completely closes the opening 2 of the housing cover 2 0 3 a to prevent foreign substances such as dust from entering, and flips the disc D as necessary. As shown in FIGS. 3 and 4, the clamp member 240 includes a clamp holder 241, a yoke 24 2, and a cover 2 4 3. The clamp support 2 4 1 is an edge portion supporting the opening 2 0 3 a. The yoke 2 4 2 is arranged on the clamp hole 2 4 1. The upper cover is used to completely cover the upper part of the clamp bracket 2 4 1

〇821pif.ptd page 16 200303529 V. Description of the invention (8) Port 2 0 3a. Therefore, gi & seal, dust cannot pass through = the opening 2 0 3a is completely sealed by the clamp member 240 and the cover 20 3 is opened, and the disc η exhausts the opening 2 0 3a. In order to exchange the disc D, the disc D within 021 must be played and replaced with a new disc, as shown in FIG. 4. When the clamp area D1 of the housing is in close contact with the clamp of the disc D, as shown in the 11m clamp holder 241. When the disc drive is displayed. Moreover, the disc d rises, as recorded / reproduced in the library shown in FIG. 10, and the built-in rotating disk 7 enters and enters through the hole 202. At this time, the yoke 242 invites the magnetic disk thus accommodated on the rotating disk T Slice D rises. It is placed on the rotating disk. The iron T1 produces a magnetic attraction between the magnets T1. The magnetic attraction force is the same as that of the clamp disc D. The jin finger is the lock plate (0C / g Ple ^ e) on the first movable shutter portion 2 1 1, and the lock plate 211b has Locking hook (211c). When the hole 200 is closed, the locking hook 2Uc can be elastically engaged with the locking groove 212b 'on the locking protrusion 212b of the second movable shutter portion 212. The disc cartridge with the disc D enters a disc drive device with the movable shutter 2 10 and the cover 203 closed, as shown in FIG. 5. At this time, all the channels that dust can penetrate into the inside of the disc cartridge are blocked. When the disc cartridge enters the disc drive device, as shown in FIG. 6, the opening lever 1 2 0 arranged on the disc drive device pushes the lock piece 2 1 1 b so that the lock hook 2 1 1 c moves from the lock groove 2 1 2 b 'Release and push open the locking protrusion 2 1 2 b where the locking groove 212b' is formed. Therefore, the second movable shutter unit 2 1 2 is pivoted clockwise in the drawing, and then the first movable shutter unit 2 1 1 is rotated counterclockwise by engaging with the joint portion 2 1 3. So between the first activity cover

10821pif.ptd

200303529 V. Description of the invention (9) The hole 2 2 between the plate portion 2 1 1 and the second movable shutter portion 2 1 2 is opened. As a matter of fact, since only the protrusions 2 2 0, 2 3 0 of the first movable shutter unit 2 1 1 and the second movable shutter unit 2 1 2 contact the disc D and since the contact area is limited to the edge of the disc D Department D 3 is a non-data area. Therefore, when the movable shutter 2 10 is opened and closed, the data area d 2 of the recording surface on the disc D is hardly damaged. When the movable shutter 2 10 is opened, the disc D is downward along the inclined surfaces 221, 231 of the protrusions 2 2 0 and 230, and the temporary surface is obtained by the upper surface of the protrusion 20 and the inclined surfaces 221, 231. Support, as shown in Figures 6 and 9. In this state, the disc drive rotating disc (not shown) of the disc drive device enters through the hole 202 and clamps the disc D. The disc D is formed by the protrusion 2 0 5 and the inclined surface 2 2 1. 2 3 1 and is supported against the clamp member 2 4 0 as shown in FIG. 10. After that, rotate the rotary disk and perform data recording / copying operations related to the disc D. Conversely, when the recording / copying operation is completed, the rotary disk is lowered and the gripper action by the gripper member 240 is removed. The protrusions 2 05 and the inclined surfaces 2 2 1 and 231 support the non-data areas D1 and D3 of the disc, respectively. In this state, the disc cartridge is ejected from the disc drive device, and the first movable shutter portion 2 1 1 and the second movable shutter portion 2 1 2 return to their original positions to close the hole 202. In this embodiment, the peripheral edge portion d 3 of the disc D rises along the inclined surfaces 2 2 1 and 2 3 1 of the protruding portions 2 2 0 and 2 3 0 and returns to the situation shown in FIG. 5. Since the 'moving shutter 2 10' does not touch the data area D2 of the disc β during the closing operation, the data area D2 can be safely stored. Moreover, in this state, the disc D rises along the inclined surfaces 221, 231, and pushes the sweet support 241 of the edge portion of the support opening 203a to closely contact the upper cover 243. Ie clip

10821pif.ptd Page 18 200303529 V. Description of Invention (ί) The clamp bracket 2 4 1 is clamped between the disc D and the upper cover 2 4 3. Therefore, since the clamp bracket 2 4 1 does not move, it is possible to avoid the phenomenon that the clamp bracket 2 4 1 collides with other components in the disc cartridge, such as the case cover 203 and the upper cover 243, and the generated noise. In a state where the movable shutter 2 1 0 is closed, since the engaging protrusions 2 1 1 a and the engaging grooves 2 1 2 a of the first movable shutter portion 2 1 1 and the second movable shutter portion 2 1 2 are joined to each other, The end portion 2 7 a of the support member 2 7 is caught by the contact portion 206 a of the guide slit 206. Even when the movable shutter 210 is pressed into the housing 201 by the pressure through the holes, the movable shutter 210 is not advanced. Therefore, deformation due to an external force applied to the movable shutter 2 10 can be prevented and the closed state of the hole 202 can be stably maintained. Next, FIGS. 12 to 14 show a disc cartridge according to another preferred embodiment of the present invention. In this embodiment, the same reference numerals refer to the same components having the same functions. As shown in the drawings, a disc cartridge of this another embodiment has a structure similar to that of the previously mentioned embodiment. However, it does not have a hole like the opening 2 03 a of the case cover 23, and the clamp member 24 is arranged on the inner surface of the case cover 2 ^ 3. That is, in this embodiment, since the opening through which dust can pass is not formed on the case cover 230, the completely closed state on the side of the case cover 230 can be maintained. Since the shell cover 203 does not have two mouthpieces ′ sandwiching member 2 40, it is arranged on the inner surface of the shell cover 203. The clamp member 240 includes a yoke 2 42, a clamp bracket 241, and an annular member 244 attached to the housing cover 203. The clamp bracket 241 is supported when it contacts an edge portion of the annular member 244.

l〇82lpif.ptd

Page 19 200303529 V. Description of the invention (11) When the disc cartridge with the above structure is loaded into the disc drive device and the data recording / copying process is performed, as shown in FIG. 13, the disc D is clamped Between the rotating disk T and the clamp bracket 2 4 1. When the disc cartridge is ejected from the disc drive, as shown in Fig. 14, the clamp bracket 2 41 is clamped between the disc and the inner surface of the case cover 203 '. Therefore, the disc cartridge of this embodiment can fundamentally prevent dust from penetrating through the cover 230 '. Other functions including the opening / closing of the movable shutter are the same as those of the previously mentioned embodiment. As mentioned above, the disc cartridge of the present invention has the following effects: First, by blocking the opening to the outside of the case cover, dust can be prevented from entering, so the performance of the disc's recording surface from being contaminated can be reduced. . Second, since the clamp member is disposed on the disc cartridge, the disc drive device can be made simple and lightweight. Third, since the end portion of the support member is stuck at the contact portion of the guide slit, it is possible to prevent deformation due to external force being applied to the movable shutter and the closed state of the movable shutter can be stably maintained. Fourth, since the movable shutter in the shell only contacts the non-data area of the disc during the opening / closing operation of the hole, the data area of the disc can be safely stored. Fifth, because the cover is arranged on the casing and can be opened and closed, the disc can be easily replaced. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art will not depart from the present invention.

10821pif.ptd Page 20 200303529

10821pif.ptd Page 21 200303529 Brief description of the drawings Figure 1 is a perspective view of a conventional disc cartridge; Figures 2A and 2B are the open / close states of the movable shutter of the conventional disc cartridge in Figure 1 FIG. 3 is an exploded perspective view of a disc cartridge according to a preferred embodiment of the present invention, FIG. 4 is a state diagram of a combination of the disc cartridges of FIG. 3, and FIG. 5 is a view of FIG. 3 Plan view of the movable shutter of the disc cassette closed, FIG. 6 is a plan view of the opened state of the movable shutter of the disc cassette of FIG. 3, and FIG. 7 is a cross-sectional view of FIG. 5 along the line A-A '; Fig. 8 is a sectional view taken along line B-B 'in Fig. 5; Fig. 9 is a sectional view taken along line C-C' in Fig. 5; and Fig. 10 is a clip in the disc cartridge of Fig. 3 Fig. 11 is a state diagram of a clamp disc; Fig. 11 is a state diagram of a clamp clamp bracket in the disc cassette of Fig. 3, and Fig. 12 is an exploded view of a disc cassette according to another preferred embodiment of the present invention Perspective view; Fig. 13 is a state diagram of the clamp discs in the disc cartridge of Fig. 12; and Fig. 14 is a state diagram of the clamp jaw holder in the disc cartridge of Fig. 12 . Description of graphical symbols: 100, 200: Disc cartridge

10821pif.ptd Page 22 200303529 Brief description of drawings 1 0 1, 20 1: Housing 1 0 1 a: Groove 1 02, 2 0 2: Holes 103, 203, 203 ': Shell cover 1 0 3 a: Prevent Disengagement lever 1 0 3 b, 2 0 3 a: opening 1 1 0, 2 1 0: movable shutter 1 1 0 a: rotation axis 1 1 1, 2 1 1: first movable shutter portion 111a, 2 1 1 b · Locking piece 1 1 1 b: Blocking piece 1 1 1 c: Protrusion 1 1 2, 2 1 2: Second movable shutter portion 1 1 3: Engagement tooth portion 1 20: Opening 2 〇4 Torque Spring 205: protrusion 2 0 6: guide slit 2 0 6 a: contact portion 2 6 6 b: receiving portion 2 0 7: support member 2 0 7 a: end portion 2 1 1 a: engagement protrusion 2 1 1 c: lock hook

10821pif.ptd Page 23 200303529 Schematic description

2 12a: engagement groove 212b: latching protrusion 212b ,: lock groove 213: joint 2 2 0 ^ 230: protrusion 22 1 ^ 2 3 1: inclined surface 2 4 0, 2 4 0 ′: clamp member 241: Clamp bracket 2 4 2: Xinger 2 4 3: Upper cover 244: Bad member D ·· Wall panel D1: Clamp zone D2: Lean material zone D3 ·· Edge T · Rotating disk T1: Magnet 10821pif.ptd Page 24

Claims (1)

200303529 VI. _Please Patent Scope1. A disc cartridge includes a case for accommodating a disc J a case cover j which is arranged on the case and can be opened and closed, and which has-opening π open A movable shutter that is open to the outside is disposed in the casing and is located below the disc and can be moved to open / close the hole in the casing; and a clamp member is provided with the casing cover The opening VJ is used to clamp the disc. The disc cartridge described in item 1 of the patent scope, wherein the clamp member includes: • A clamp bracket J for contacting and A magnetic object supporting an edge portion of the opening α of the case cover is disposed on the clamp bracket for applying a magnetic attraction to the rotating disk. The rotating disk is connected to a disc drive. The device is used for accommodating the disc, and an upper cover is used for sealing the opening V 〇3 from above the clamp bracket. The disc cartridge as described in the second item of the patent scope of the patent, which 1 makes the movable shutter A non-data area having a slanted surface with a predetermined angle and a protrusion protruding to support the periphery of the disc. When the movable shutter is opened, the disc rises along the slanted surface to closely contact the cover. 4. The disc cartridge as described in item 1 of the patent scope, wherein-the guide slit is formed along the moving track of the movable shutter arranged in the casing and is located on the movable shutter The support member is inserted into the lead 10821pif.ptd Page 25 200303529 6. Scope of patent application The guide slit can slide, so that one end portion of the support member is caught by a contact portion of the guide slit. 5. The disc cartridge as described in item 1 of the scope of patent application, wherein the movable shutter includes a first movable shutter portion and a second movable shutter portion, which can be opened / closed by approaching or separating from each other. A hole, and a joint groove is disposed on one of the first movable shutter portion and the second movable shutter portion, and a joint protrusion is disposed on the first movable shutter portion and the second movable shutter portion The other of the two parts is joined to the engaging groove, so that when the engaging protrusion is engaged with the engaging groove, the engaging protrusion is inserted into the engaging groove. 6. The disc cartridge described in item 1 of the scope of patent application, wherein a protrusion is used to support the non-data area of the inner periphery of the disc, and the disc will follow the inclination disposed in the casing The surface drops. 7. —disc cartridge, comprising: a casing for accommodating a disc; a casing cover which is arranged on an upper surface of the casing and can be opened and closed to seal the casing. A surface; a movable shield disposed in the casing and below the disc and movable, for opening / closing a hole in the casing; and a clamp member disposed in the casing cover An inner surface is used to clamp the disc. 8. The disc cartridge according to item 7 of the scope of patent application, wherein the clamp member includes: a ring-shaped member disposed on the inner surface of the case cover; 10821pif.ptd Page 26 200303529 VI. Patent application scope A clamp bracket for supporting an edge portion of the ring-shaped member; and a magnetic object arranged on the clamp bracket for applying a magnetic attraction to On a rotating disk, the rotating disk is housed in a disc drive device for receiving the disc. 9. The disc cartridge according to item 8 of the scope of patent application, wherein the movable shutter has an inclined surface at a predetermined angle and has a protrusion protruding to support a non-data area on the periphery of the disc, so When the movable shutter is opened, the disc is lowered along the inclined surface, and when the movable shutter is closed, the disc is raised along the inclined surface to closely contact the inner surface of the case cover. 10. The disc cartridge according to item 7 of the scope of patent application, wherein a guide slit is formed along a moving track of the movable shutter disposed in the casing, and is located on the movable shutter An upper support member is inserted into the guide slit and can slide, so that one end portion of the support member is caught by a contact portion of the guide slit. 1 1. The disc cartridge according to item 7 of the scope of patent application, wherein the movable shutter includes a first movable shutter portion and a second movable shutter portion, which can be opened / closed by approaching or separating from each other. The hole, and a joint groove is disposed on one of the first movable shutter portion and the second movable shutter portion, and a joint protrusion is disposed on the first movable shutter portion and the second movable shutter portion. The other of the two plate portions is joined to the joining groove, so that when the joining protrusion is joined with the joining groove, the joining protrusion is inserted into the joining groove. 10821pif.ptd Page 27 200303529 10821pif.ptd Page 28