JP2003109346A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk cartridge that has desired rigidity and also high head loading property. SOLUTION: In this disk cartridge provided with a recording disk 3 where recording can be performed on both upper and lower surfaces, a cartridge case 1 for storing the recording disk 3 and having driving shaft insertion holes 8 and head access openings 9 on the upper and lower surfaces, and a shutter member 4 supported by the cartridge case 1 and movable only in one direction of opening/closing the head access openings on the both upper and lower surfaces, a shutter opening/closing recessed part 52 with which the tip part of one shutter opening member 53a between two interconnecting shutter opening members 53a and 53b provided in a drive unit is provided in the vicinity of an end part on the side of a shutter opening direction of the front of the shutter member 4, and a slit 54 through which the tip part of the other shutter opening member 53b is inserted and which allows the tip part to move is formed on the front of the cartridge case 1.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge such as an optical disk cartridge or a magnetic disk cartridge, and more particularly to a disk cartridge containing a double-sided recording disk. 2. Description of the Related Art There are two types of disk cartridges containing a recording disk of a double-sided recording specification, such as a double-shutter type such as a DVD-RAM and a single-shutter type such as a 5-inch MO. [0003] By the way, a disk cartridge with double shutters has a problem that the rigidity of the disk cartridge is weakened structurally. on the other hand,
Although a shutter opening / closing mechanism such as a 5-inch MO has a desired rigidity because the shutter is not double-opened,
There is a problem in that a trouble occurs in using the flying head, and the head load property is poor. An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a disk cartridge having a desired rigidity and a good head load property. [0005] In order to achieve the above object, the present invention provides a recording disk capable of recording on both upper and lower surfaces, a storage disk for accommodating the recording disk, and a driving shaft insertion hole and a head on both upper and lower surfaces. A cartridge case having an access port, for example, an outer shell and an inner shell described below, and a combination of a shutter and a slider, which is supported by the cartridge case and can be moved only in one direction to open and close the head access ports on both the upper and lower sides, from And a disk cartridge having a shutter member. [0006] The 2 provided in the drive device
A shutter opening / closing recess in which the tip of one shutter opening member of the two linked shutter opening members engages is provided near the shutter opening direction side end of the front surface of the shutter member, and the other of the shutter opening members And a slit for allowing movement of the other shutter opening member is formed on the front surface of the cartridge case. An embodiment of the present invention will be described below with reference to the drawings. 1 is a plan view of a disk cartridge such as an MO, FIG. 2 is a front view of the disk cartridge, and FIG.
4 is a left side view of the disk cartridge, FIG. 4 is a right side view of the disk cartridge, FIG. 5 is a rear view of the disk cartridge, and FIG. 6 is an exploded perspective view of the disk cartridge. The disk cartridge includes an outer shell 1, an inner shell 2 disposed inside the outer shell 1, a recording disk 3 rotatably stored inside the inner shell 2 (see FIG. 6), A shutter 4 slidably supported outside the outer shell 1 and a slider 5 connected to the shutter 4
It is mainly composed of The outer shell 1 comprises a combination of a first outer shell 6 and a second outer shell 7, and the outer shells 6, 7 are screwed or ultrasonically welded. FIGS. 7 to 14 show the first outer shell. FIG. 7 is a plan view of the first outer shell, FIG. 8 is a front view of the first outer shell, and FIG. 9 is a left side surface of the first outer shell. FIGS. 10 and 10 are right side views of the first outer shell, FIG. 11 is a rear view of the first outer shell, FIG. 12 is a bottom view of the first outer shell, and FIG. 13 is a perspective view of the first outer shell as viewed from above. FIG. 14 is a perspective view of the first outer shell as viewed from below. FIGS. 15 to 22 show the second outer shell. FIG. 15 is a plan view of the second outer shell, FIG. 16 is a front view of the second outer shell, and FIG. 17 is a left side view of the second outer shell. FIG. 18 is a right side view of the second outer shell. FIG. 19 is a rear view of the second outer shell.
0 is a bottom view of the second outer shell, FIG. 21 is a perspective view of the second outer shell as viewed from above, and FIG. 22 is a perspective view of the second outer shell as viewed from below. A drive shaft insertion hole 8 is provided substantially at the center of the first outer shell 6 and the second outer shell 7, and an outer side head access port 9 is formed upstream of the drive shaft insertion direction in the disk cartridge insertion direction. Mouth 9
A concave outer-side bridge portion 10 which is lowered further is provided on the upstream side in the disk cartridge insertion direction. The thickness of the outer-side bridge portions 10 when the first outer shell 6 and the second outer shell 7 are overlapped is designed to be substantially the same as the thickness of the recording disk 3. As shown in FIGS. 12 and 20, on both sides of the outer bridge portion 10, slider guide portions 11 extending linearly are formed. Also, as shown in FIGS. 12 and 14 and FIGS. 20 and 22, the first outer shell 6
A circular inner shell receiving portion 55 is formed on the inner surface of the second outer shell 7, and positioning projections 12 are provided at equal intervals in the inner shell receiving portion 55 and around the drive shaft insertion hole 8. I have. As shown in FIGS. 2 to 4, guide grooves 56 are formed on both side surfaces of the outer shell 1. The inner shell 2 comprises a combination of a first inner shell 13 and a second inner shell 14. 23 to 28 show the first inner shell. FIG. 23 is a plan view of the first inner shell, FIG. 24 is a front view of the first inner shell, and FIG. 25 is a right side view of the first inner shell. 26 is a bottom view of the first inner shell, FIG. 27 is a perspective view of the first inner shell as viewed from above, and FIG. 28 is a perspective view of the first inner shell as viewed from below. FIGS. 29 to 34 show the second inner shell. FIG. 29 is a plan view of the second inner shell, FIG. 30 is a front view of the second inner shell, and FIG. 31 is a right side view of the second inner shell. FIG. 32 is a bottom view of the second inner shell, FIG. 33 is a perspective view of the second inner shell as viewed from above, and FIG. 34 is a perspective view of the second inner shell as viewed from below. A hub insertion hole 15 is formed at the center of the first inner shell 13 and the second inner shell 14, and an inner head access port 16 is provided near the hub insertion hole 15, and an outer peripheral portion of the inner head access port 16 is provided. A lower inner-side bridge portion 17 is formed at a lower level. First inner shell 13 and second inner shell 1
4 when the inner side 4 is overlapped
Is designed to be almost the same as the thickness of the recording disk 3. As shown in FIGS. 26 and 28 and FIGS. 32 and 34, a disk-shaped recess 18 is provided inside the first inner shell 13 and the second inner shell 14. The recording disk 3 accommodated in the disk accommodating recess 18 is of a double-sided recording type with a film surface incident, and has a hub 19 at the center as shown in FIG. 2nd inner shell 14
Through the hub insertion hole 15. An arcuate tooth 20 and a connection hole 21 are formed on the outer periphery of the first inner shell 13, and a connection pin 22 provided on the outer periphery of the second inner shell 14 is inserted into the connection hole 21. The first inner shell 13 and the second inner shell 14 are combined. FIG. 35 is an exploded perspective view of the inner shell assembly. 36 to 41 show a state when the shutter is fully opened, FIG. 36 is a plan view of the inner shell assembly, FIG. 37 is a front view of the inner shell assembly, FIG. 38 is a right side view of the inner shell assembly, and FIG. FIG. 40 is an enlarged view of the portion of FIG. 39A, FIG. 41 is a bottom view of the inner shell assembly, and FIG.
It is sectional drawing on the B line. 42 to 45 show a state in which the shutter is fully closed. FIG. 42 is a plan view of the inner shell assembly, FIG. 43 is a bottom view of the inner shell assembly, and FIG. 44 is an enlarged view of a part C in FIG. 45 is FIG.
It is sectional drawing on the D line. As shown in FIG. 35, a C-ring 24 is provided above the hub insertion hole 15 of the first inner shell 13 and below the hub insertion hole 15 of the second inner shell 14 via a disk pressing member 23, respectively. Will be installed. FIG. 46 is a plan view of the disk pressing member, FIG. 47 is a front view of the disk pressing member, FIG. 48 is a bottom view of the disk pressing member, FIG. 49 is a perspective view of the disk pressing member viewed from above, and FIG. It is the perspective view which looked at the disk holding member from the lower side. As shown in these figures, the disk pressing member 23 has an annular shape,
And a plurality of protrusions 26, and the protrusions 26 have inclined surfaces 27.
Is formed. Each projection 26 has a hole 28 for preventing rotation.
Is provided. FIG. 51 is a plan view of the C-ring, FIG. 52 is a front view of the C-ring, FIG. 53 is a bottom view of the C-ring, and FIG.
FIG. 55 is a perspective view of the C-ring viewed from below. The C-ring 24 is provided with a plurality of protrusions 29 protruding inward, and inclined surfaces 30 are formed on both sides thereof. A connecting pin 31 protrudes near the protruding portion 29. As shown in FIGS. 23 and 27 and FIGS. 29 and 33, a disc holding member receiving portion 32 which is one step lower is provided around the hub insertion hole 15 of the first inner shell 13 and the first inner shell 14. It is formed, and a plurality of inclined portions 33 are provided in the circumferential direction thereof. A C-ring housing 3 is provided radially outside the disc holding member housing 32.
4 are formed, and a plurality of through holes 35 are provided in the circumferential direction thereof. FIG. 56 is a plan view of the shutter, FIG. 57 is a front view of the shutter, FIG. 58 is a left side view of the shutter, and FIG. 59 is a perspective view of the shutter. The shutter 4 is made of a thin metal plate, and has two parallel extending flat plates 36, 36 for opening and closing the drive shaft insertion hole 8 and the outer head access port 9 of the outer shell 1, and a base end of the flat plate 36. It has an end face plate portion 37 for connecting the portions, and as shown in FIG. 58, the side surface shape is substantially U-shaped. Near the base end of the flat plate portion 36, the end face plate portion 3
A plurality of locking claws 38 extending toward the side 7 are provided. Although not shown, the locking claw 38 is slightly bent inward. As shown in FIG. 57, a rectangular notch 39 cut inward is formed at the end of the end face plate 37 on the shutter opening direction side. FIG. 60 is a plan view of the slider, FIG. 61 is a front view of the slider, FIG. 62 is a left side view of the slider, FIG. 63 is a right side view of the slider, FIG. 64 is a rear view of the slider, and FIG. It is a perspective view. The slider 5 is provided with a locking claw 3 of the shutter 4.
8, a shutter support portion 41 having a plurality of locking projections 40 with which the distal end portions abut, and a slider guide portion 11 of the outer case 1 provided inside the shutter support portion 41.
, A rack portion 43 protruding from the sliding portion 42 in the direction opposite to the shutter opening direction, and a spring hook portion 44 provided at an end of the sliding portion 42 on the shutter opening direction side. have. As shown in FIG. 61, a rectangular shutter opening / closing concave portion 52 is formed at the front end of the shutter support portion 41 on the shutter opening direction side. As shown in FIG. 6, a support shaft 45 is protruded from the second outer shell 7 near the outer head access port 9, and a pinion 46 is rotatably supported thereon. The pinion 46 has a first gear 47 having a small diameter and a second gear 48 having a large diameter formed integrally. As shown in FIGS. 66 and 67, the first gear 47 is formed by the rack 43 of the slider 5 and the second gear 48. Each meshes with the arcuate teeth 20 of the inner shell 2. As shown in FIGS. 66 and 67, one end 49a of the coil spring 49 is locked to the spring hooking portion 44 of the slider 5, and the other end 49b of the coil spring 49 is fixed to the spring locking portion 50 of the second outer shell 7. Locked. Next, the order of assembling the disk cartridge will be described. As shown in FIG. 6, the inner shell 2 with the recording disk 3 accommodated inside and the disk pressing member 23 and the C-ring 24 mounted on the upper and lower surfaces is placed on the second outer shell 7. By inserting the positioning protrusions 12 provided on the second outer shell 7 into the rotation preventing holes 28 provided on the lower disk holding member 23, the lower disk holding member 23 is prevented from rotating. Is positioned. As shown in FIG. 66, the slider 5, the pinion 46, the coil spring 49, the write protector 51 and the like are set at predetermined positions on the second outer shell 7. Next, the first outer shell 6 is overlaid on the second outer shell 7, and the positioning projections 12 provided on the first outer shell 6 are rotated by the rotation provided on the upper disc holding member 23. By inserting the disc holding member 23 into the blocking hole 28, the upper disc holding member 23 is positioned so as not to rotate. Then the first outer shell 6
And the second outer shell 7 are fastened by screws to form the outer shell 1. Thereafter, the outer shell 1 is moved from the free end of the flat plate portion 36 opposite to the end plate portion 37 of the shutter 4.
The shutter 4 is fitted outside. In this state, the locking projection 40 of the shutter 4 protrudes from the front end surface of the outer shell 1.
The tip of the locking claw 38 provided on the shutter supporting member 41 goes over the locking protrusion 40 of the shutter support portion 41, and the locking protrusion 40
Abuts the inner surface of the As a result, the shutter 4 is supported by the slider 5, and the assembly of the disk cartridge is completed. Next, the operation of the disk cartridge will be described. 68 to 72 show the state of the disk cartridge when the shutter is fully closed.
8 is a plan view of the disk cartridge, FIG. 69 is a front view of the disk cartridge, FIG. 70 is a cross-sectional view taken along the line E-E of FIG. 68, FIG. 71 is a cross-sectional view taken along the line F-F of FIG. FIG. FIGS. 73 to 77 show the state of the disk cartridge when the shutter is fully opened.
74 is a plan view of the disc cartridge, FIG. 74 is a front view of the disc cartridge, FIG. 75 is a cross-sectional view taken along line 73H-H, FIG. 76 is a cross-sectional view taken along line 73I-I, and FIG.
It is an expanded sectional view of 5J part. FIGS. 78 to 83 are views for explaining the opening operation of the shutter. FIGS. 78 and 79 are a plan view and a front view showing a state where the disk cartridge is being inserted into the drive device, and FIGS. FIGS. 82 and 83 are a plan view and a front view showing a state immediately before the shutter is opened, and FIGS. 82 and 83 are a plan view and a front view showing the fully opened state of the shutter. As shown in FIG. 68, when the drive shaft insertion hole 8 of the outer shell 1 and the outer head access port 9 are closed by the shutter 4, the pinion 46 and the rack 43 are closed.
In addition, the pinion 46 and the arcuate hub 20 are engaged at a position as shown in FIG. 66, and the inner head access port 16 of the inner shell 2 is completely separated from the outer head access port 9 of the outer shell 1. (See FIG. 68). Therefore, the outer side head access port 9
Is covered by the outer surface of the inner shell 2 from the inside by the shutter 4 from the outside, while the inner side head access port 16 has a triple closed structure covered by the inner surface of the outer shell 1 and has excellent dustproofness. have. The protrusion 29 provided on the C-ring 24 rides on the protrusion 2 of the disk pressing member 23. Therefore, the disk pressing member 23 is pressed against the recording disk 3 by the C-ring 24, as shown in FIG. As shown in the figure, the disc pressing portion 25 of the disc pressing member 23
As a result, the clamp area corresponding to the inner peripheral portion of the recording disk 3 is sandwiched from both sides, and the recording disk 3 is fixed. Therefore, the recording disk 3 can be protected from an external force such as an impact. Although the drive shaft insertion hole 8 of the outer shell 1 is closed by the shutter 4, the disk pressing portion 25 of the disk pressing member 23 is brought into close contact with the clamp area of the recording disk 3,
Intrusion of dust from the drive shaft insertion hole 8 can be prevented twice. By attaching the shutter 4 to the slider 5, as shown in FIG. 69, a notch 39 provided in the shutter 4 exposes a shutter opening / closing recess 52 of the slider 5. As shown in the drawing, the shutter opening / closing concave portion 52 is provided on the shutter opening direction side of the center line X of the shutter 4. Further, a slit 54 is formed on the front surface of the outer shell 1 by combining the first outer shell 6 and the second outer shell 7. As shown in FIG. 78, two shutter opening members 53a and 53b which move in opposite directions stand by in the disk holder of the drive device. When the disc cartridge is inserted into the drive device along the direction of arrow K with the end face plate portion 37 of the shutter 4 first,
The leading end of one shutter opening member 53a is inserted into the shutter opening / closing recess 52 of the slider 5 and the leading end of the other shutter opening member 53b is inserted into the end of the slit 54 of the outer shell 1 (FIG. 80, See FIG. 81). When the disc cartridge is further inserted into the drive device, the shutter opening member 53a is moved in the direction of arrow La and the shutter opening member 53b is moved in the direction of arrow Lb against the elasticity of the coil spring 39, that is, the two shutter opening members 53a, 53a. 53b is a head access port 9.1
6 (outward direction). The slider 5 (shutter 4) is similarly moved in the direction of the arrow La by the movement of the shutter opening member 53a, and the shutter 4 is opened. This slider 5
66, the pinion 46 rotates in the direction of the arrow M as shown in FIG. 66, the inner shell 2 rotates in the direction of the arrow N, and the shutter 4 is fully opened.
2, the inner-side head access port 16 of the inner shell 2 matches the outer-side head access port 9. In this state, the optical head can access the upper head access ports 9 and 16, and the floating magnetic head can access the lower head access ports 9 and 16, respectively. Since the C ring 24 is connected to the inner shell 2 via the connecting pin 31, the inner shell 2
The C-ring 24 rotates with the rotation of the C-ring 2
4 and the inclined surface 27 of the disc holding member 23
Cooperates with the disk holding member 23 to make the recording disk 3
Pushed away from you. Since the disc holding member 23 is prevented from rotating by the positioning protrusion 12 of the outer shell 1, even if the inner shell 2 and the C-ring 24 rotate, the disc holding member 23 does not rotate and moves in the axial direction of the positioning protrusion 12. Just do it. As a result, as shown in FIG. 77, the disk pressing portion 25 of the disk pressing member 23 separates from the recording disk 3 and the recording disk 3
Is in a free state, and the spindle of the drive device engages with the hub 19 of the recording disk 3 to rotate the recording disk 3. When the shutter 4 is opened, the other shutter opening member 53b only moves within the slit 54 of the shutter 4 and does not participate in the opening operation of the shutter 4. Since the disc cartridge has a double-sided recording specification, when the disc cartridge is turned over and inserted into the drive device, the other shutter opening member 53
b engages with the shutter opening / closing concave portion 52 and is involved in the opening operation of the shutter 4.
3a moves only in the slit 54 of the shutter 4. When the disk cartridge is removed from the drive device, the operation is completely the same as described above. Finally, as shown in FIG. 68, the drive shaft insertion hole 8 of the outer shell 6 and the outer head access port 9 are closed by the shutter. 4, the inner shell 2 returns to the position shown in FIG.
As shown in FIG. 72, the recording disk 3 is clamped and fixed from both sides by the disk pressing member 23. In the present embodiment, the inner shell 2 and the C-ring 24 are provided separately, but they may be integrally formed. In this embodiment, the shutter 4 and the slider 5 are provided separately, but they may be integrally formed. In this embodiment, the C ring 24 is used.
An O-ring may be used. Although the present embodiment has been described for the case of a magneto-optical disk cartridge, the present invention is also applicable to other optical disk cartridges and magnetic disk cartridges. As described above, according to the present invention, the shutter opening / closing concave portion with which the leading end of one of the two interlocking shutter opening members provided in the drive device is engaged. A slit provided in the vicinity of the shutter opening direction side end of the front surface of the shutter member, into which the tip of the other shutter opening member of the shutter opening member is inserted, and which allows movement of the other shutter opening member; It is formed on the front surface of the case. As described above, since the shutter has one-sided opening, higher rigidity can be obtained as compared with the case where the shutter is double-opened. Further, since the shutter opening / closing concave portion is provided not in the center of the shutter member but in the vicinity of the end in the shutter opening direction, and a slit is formed on the front surface of the cartridge case to allow movement of the other shutter opening member, the shutter is opened. At this time, since the two shutter opening members move in a direction away from the head access port, the head is not hindered by the movement of the shutter opening member,
It is possible to easily load a recording disk and to provide a disk cartridge having a good head load property.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a disk cartridge according to an embodiment of the present invention. FIG. 2 is a front view of the disk cartridge. FIG. 3 is a left side view of the disk cartridge. FIG. 4 is a right side view of the disk cartridge. FIG. 5 is a rear view of the disk cartridge. FIG. 6 is an exploded perspective view of the disk cartridge. FIG. 7 is a plan view of a first outer shell. FIG. 8 is a front view of a first outer shell. FIG. 9 is a left side view of the first outer shell. FIG. 10 is a right side view of the first outer shell. FIG. 11 is a rear view of the first outer shell. FIG. 12 is a bottom view of the first outer shell. FIG. 13 is a perspective view of the first outer shell as viewed from above. FIG. 14 is a perspective view of the first outer shell as viewed from below. FIG. 15 is a plan view of a second outer shell. FIG. 16 is a front view of a second outer shell. FIG. 17 is a left side view of the second outer shell. FIG. 18 is a right side view of the second outer shell. FIG. 19 is a rear view of the second outer shell. FIG. 20 is a bottom view of the second outer shell. FIG. 21 is a perspective view of the second outer shell as viewed from above. FIG. 22 is a perspective view of the second outer shell as viewed from below. FIG. 23 is a plan view of a first inner shell. FIG. 24 is a front view of the first inner shell. FIG. 25 is a right side view of the first inner shell. FIG. 26 is a bottom view of the first inner shell. FIG. 27 is a perspective view of the first inner shell as viewed from above. FIG. 28 is a perspective view of the first inner shell as viewed from below. FIG. 29 is a plan view of a second inner shell. FIG. 30 is a front view of a second inner shell. FIG. 31 is a right side view of the second inner shell. FIG. 32 is a bottom view of the second inner shell. FIG. 33 is a perspective view of the second inner shell as viewed from above. FIG. 34 is a perspective view of the second inner shell viewed from below. FIG. 35 is an exploded perspective view of the inner shell assembly. FIG. 36 is a plan view of the inner shell assembly. FIG. 37 is a front view of the inner shell assembly. FIG. 38 is a right side view of the inner shell assembly. FIG. 39 is a bottom view of the inner shell assembly. FIG. 40 is an enlarged view of a portion shown in FIG. 39A. FIG. 41 is a sectional view taken along the line B-B of FIG. 40; FIG. 42 is a plan view of the inner shell assembly. FIG. 43 is a bottom view of the inner shell assembly. FIG. 44 is an enlarged view of a portion C in FIG. 43; FIG. 45 is a cross-sectional view taken along the line DD in FIG. 44. FIG. 46 is a plan view of a disc pressing member. FIG. 47 is a front view of the disc holding member. FIG. 48 is a bottom view of the disc pressing member. FIG. 49 is a perspective view of the disk pressing member as viewed from above. FIG. 50 is a perspective view of the disc pressing member as viewed from below. FIG. 51 is a plan view of a C-ring. FIG. 52 is a front view of a C-ring. FIG. 53 is a bottom view of the C-ring. FIG. 54 is a perspective view of the C-ring viewed from above. FIG. 55 is a perspective view of the C-ring viewed from below. FIG. 56 is a plan view of the shutter. FIG. 57 is a front view of the shutter. FIG. 58 is a left side view of the shutter. FIG. 59 is a perspective view of a shutter. FIG. 60 is a plan view of the slider. FIG. 61 is a front view of the slider. FIG. 62 is a left side view of the slider. FIG. 63 is a right side view of the slider. FIG. 64 is a rear view of the slider. FIG. 65 is a perspective view of a slider. FIG. 66 is a perspective view showing a state of a part of the inside of the disk cartridge when the shutter is fully closed. FIG. 67 is a perspective view showing a part of the inside of the disc cartridge when the shutter is fully opened. FIG. 68 is a plan view of the disk cartridge. FIG. 69 is a front view of the disk cartridge. FIG. 70 is a sectional view taken along the line EE in FIG. 68; FIG. 71 is a cross-sectional view taken along the line FIG. 68FF; FIG. 72 is an enlarged sectional view of a portion G in FIG. 70; FIG. 73 is a plan view of the disk cartridge. FIG. 74 is a front view of the disk cartridge. FIG. 75 is a cross-sectional view taken along the line HH of FIG. 73; FIG. 76 is a cross-sectional view taken along the line II-I of FIG. 73; FIG. 77 is an enlarged sectional view of a portion J in FIG. 75; FIG. 78 is a plan view showing a state where the disk cartridge is being inserted into the drive device. FIG. 79 is a front view showing a state where the disk cartridge is being inserted into the drive device. FIG. 80 is a plan view showing a state immediately before the shutter is opened. FIG. 81 is a front view showing a state immediately before opening a shutter; FIG. 82 is a plan view showing a fully opened state of a shutter. FIG. 83 is a front view showing a fully opened state of a shutter. [Description of Signs] 1 outer shell 2 inner shell 3 recording disk 4 shutter 5 slider 6 first outer shell 7 second outer shell 8 drive shaft insertion hole 9 outer side head access port 10 outer side bridge section 11 slider guide section 12 positioning Projection 13 First inner shell 14 Second inner shell 15 Hub insertion hole 16 Inner-side head access port 17 Inner-side bridge section 18 Disk accommodation recess 19 Hub 20 Arc-shaped tooth section 21 Connection hole 22 Connection pin 23 Disk press member 24 C-ring 25 Disc pressing portion 26 Projecting portion 27 Inclined surface 28 Rotation blocking hole 29 Projecting portion 30 Inclined surface 31 Connecting pin 32 Disc holding member accommodating portion 33 Inclined portion 34 C-ring accommodating portion 35 Through hole 36 Flat plate portion 37 End face plate portion 38 Stop claw 39 Notch 40 Lock Piece 41 shutter support part 42 sliding part 43 rack part 44 spring hook part 45 support shaft 46 pinion 47 first gear 48 second gear 49 coil spring 50 spring locking part 51 write protector 52 shutter opening / closing concave parts 53a, 53b shutter opening member 54 Slit 55 Inner shell storage part 56 Guide groove X Center line of shutter

Claims (1)

Claims: 1. A recording disk capable of recording on both upper and lower surfaces, a cartridge case containing the recording disk and having a drive shaft insertion hole and a head access port on both upper and lower surfaces, and a cartridge case. And a shutter member that is supported and that can move in only one direction to open and close the head access ports on both the upper and lower sides, wherein one of two interlocking shutter opening members provided in the drive device is provided. A shutter opening / closing recess with which the tip of the opening member is engaged is provided near the shutter opening direction side end of the front surface of the shutter member, and the tip of the other of the shutter opening members is inserted. The slit that allows the shutter opening member to move is located in front of the cartridge case. Disk cartridge characterized in that it is formed.