JPH0424537Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention rotatably stores disc-shaped disks such as magneto-optical disks, optical disks, magnetic disks, etc., and also stores the disks in the cartridge body. This invention relates to a disk cartridge equipped with a sliding shutter for opening and closing a pickup opening.

<Prior Art> Conventionally, a disk cartridge has a disk-shaped disk rotatably housed in a cartridge main body formed by butting and connecting an upper half and a lower half to each other. Approximately at the center of both the upper and lower surfaces of the cartridge body that houses this disk, there is an opening for picking up that extends in the radial direction of the disk and is continuous with the table insertion hole where the disk table of the disk rotation device that rotates the disk faces. The section is drilled. A sliding shutter, which is bent into a substantially U-shape and opens and closes the table insertion hole and the pick-up opening, is fitted into the cartridge body from the front side.

A conceivable structure for locking such a sliding shutter 101 in a closed state with the opening portion closed is as shown in FIG. 15. In the device shown in FIG. 15, a slide guide piece is inserted into a lock member guide groove 104 formed by a pair of guide ribs 103, 103 provided in parallel on the front side of a cartridge main body 102 whose upper and lower halves are butted together. 105, and a shutter lock member 106 made of synthetic resin that slides on the front side of the cartridge body 102 is attached. There are shutters 101 on both sides of this shutter lock member 106.
The first locking claw 10 is formed by cutting and raising the middle part.
7 and a second locking pawl 108 formed by bending one side of the shutter 101 are provided.
9, 110, the first and second locking claws 107,
108 is engaged to attach the shutter 101, and the shutter 101 is slid together with the shutter 101.

Then, one end side of the slide guide piece 105 is connected to the shutter lock member 106 and extended in the extending direction of the slide guide piece 105,
A lock portion 1 is attached to the free end that is elastically biased toward the front side wall 111 provided on the front side of the cartridge body 102.
A lock arm 113 having a diameter of 12 is provided. On the other hand, there is an engagement hole 114 in the front side wall 111 of the cartridge body 102 with which the lock portion 111 engages when the shutter 101 reaches the closed position where the pickup opening is closed, and an engagement hole 114 that is adjacent to the engagement hole 114. Then, an insertion hole 116 for a lock release pin 115 provided on the recording/reproducing device side is provided.

When the shutter 101 reaches the lid closing position, the lock portion 111 is engaged with the engagement hole 114 and locked. When opening the shutter 101, the lock release pin 115 is inserted from the device side through the lock release pin insertion hole 116, and the lock arm 113 is pushed and bent into the cartridge body 102 to lock the lock part 111. is disengaged from the engagement hole 114 to release the lock. Then, the lock release pin 115 is moved in the direction of the arrow in FIG. 15, and the shutter 101 and the shutter lock member 106 are slid in the same direction to open the pickup opening.

<Problems to be solved by the invention> As described above, the lock arm 113 of the shutter lock member 106 is pressed by the lock release pin 115, and is slid together with the shutter 101 while being pressed, so that the shutter is in the open state. In the case of a disk cartridge which is constantly subjected to an urging force when in the position of the disk cartridge, the lock arm 113 easily loses its elastic restoring force and remains in a deformed state. As a result, the elastic force that causes the lock portion 111 to engage with the engagement hole 114 is lost, making it impossible to reliably lock the shutter 101. As a result, the shutter 101 opens inadvertently, making it impossible to protect the disk inside the cartridge body 102.

Therefore, the present invention maintains sufficient elastic force over a long period of time without applying stress to the shutter lock member other than during operation, making it possible to securely lock the shutter and prevent accidental opening of the shutter. The purpose of this proposal is to provide a disk cartridge that can prevent the above problems and ensure disk protection.

<Means for Solving the Problems> In order to achieve the above-mentioned purpose, the present invention provides a recording/reproducing device such as an optical pickup that rotatably stores a disk and records or reproduces information signals on the disk. A cartridge body is provided with an opening through which a means faces, and a means is slidable parallel to the front surface of the cartridge body to open and close the opening, and a connecting piece facing the front surface of the cartridge body is provided with a lock release member for engaging. A shutter is provided with a hole and a protrusion that protrudes toward the inside of the cartridge body, and a lock recess that is attached to the cartridge body by fixing the mounting base to the cartridge body, and a lock recess that is relatively engaged with the protrusion of the shutter is provided in the middle. a locking member having a movable movable portion extending from the mounting base so as to extend in a direction in which the shutter slides from a position where the opening is closed to a direction in which the opening is opened; When the shutter is slid to a closed position that closes the opening, the protrusion engages the lock recess and is locked by the lock member, and the shutter is inserted through the hole. The movable portion is pressed by a lock release member provided on the side of the recording/reproducing device, and the movable portion is displaced inward to the cartridge main body, thereby releasing the relative engagement between the protrusion and the lock recess. In the disk cartridge which is slid by the lock release member from the closed position where the opening is closed to the open position where the opening is opened, the upper surface of the free end side is moved from the position where the recess of the movable part is provided. The lock release member is a pressed surface, and a hole provided in the continuous piece for engaging the lock release member is provided at a position closer to the position where the opening is opened than the protrusion. .

<Function> The disk cartridge according to the present invention operates to open the opening provided in the cartridge body.
When the lock release member provided on the recording/reproducing device side is inserted into and engaged with the shutter through the hole provided in the continuous piece of the shutter, the lock release member locks the shutter in the opening closed position. The pressing surface of the lock release member on the upper surface of the movable part of the member is pressed to displace the movable part inward into the cartridge body and release the relative engagement between the protrusion and the lock recess.

Furthermore, the hole into which the lock release member is inserted and engaged is located closer to the position where the opening is opened than the protrusion that engages with the lock recess of the lock member. The movable portion is displaced by pressing the pressed surface portion of the lock release member located on the free end side opposite to the attachment base to the cartridge body.

<Example> Hereinafter, specific examples of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the disk cartridge according to the present invention has an upper half 1 and a lower half 2, which are formed by molding synthetic resin and have a substantially flat rectangular shape, butt against each other, and are secured by a plurality of screws 3. A cartridge body 4 configured by being coupled and fixed;
A disk-shaped disk, for example, a magneto-optical disk, rotatably stored in the cartridge main body 4;
Openings 6 and 7 are provided in which optical pickups for writing information signals to or reading out information signals written to the disks 5 provided in the upper half 1 and lower half 2 of the cartridge main body 4 face, respectively. The main component is a sliding shutter 8 that can be opened and closed.

Upper half 1 constituting the cartridge main body 4
and lower half 2, when butt-joined to each other,
They are formed symmetrically except that the write protection member mounting portions 9 are provided at the same position so that the write protection members for inhibiting writing to the disk 5 are mounted in opposite positions. The upper half 1 and the lower half 2 are formed so as to constitute a space sufficient to rotatably accommodate the disk 5 when the upper half 1 and the lower half 2 are butted together. Upright walls 10 and 11 which constitute the peripheral wall of the cartridge body 4 are formed on the peripheral edge of the cartridge body 4 by being butt-coupled as shown in FIGS. 2A and 3B and 3A and 3B, respectively. Further, in the center of the upper half 1 and the lower half 2, there is a disk table insertion hole 12 through which a disk table of a disk rotating device provided on the recording/reproducing device side that rotates the disk 5 housed in the cartridge main body 4 faces. Openings 6 and 7 are provided with optical pickups having the same width as the diameter of the disk table insertion holes 12 and 13 and facing the disk table insertion holes 12 and 13 in the radial direction of the disk 5. is drilled. That is, these openings 6 and 7 are formed in a substantially rectangular shape extending from the center of the upper half 1 and the lower half 2 to the front side where the shutter 8 is attached. And upper half 1 and lower half 2
There are disk table insertion holes 12, 13 on the inner surface of the
On a circumference slightly larger than the outer diameter of the disk 5 centered at , there are a plurality of walls that abut each other to constitute a position regulating wall that regulates the horizontal position of the disk 5, and also constitute a disk storage section. Arc-shaped ribs 16 and 17 are provided respectively.
These arcuate ribs 16 and 17 are provided at each corner of the upper half 1 and the lower half 2, and are formed to have the same height as the rising walls 10 and 11.

The rising walls 10 and 11 and the arcuate rib 1 are located at both corners of the rear side opposite to the front side where the shutter 8 of the upper half 1 and the lower half 2 is attached.
When this disk cartridge is installed in a recording/reproducing device, the positioning pins provided in the device fit into the area surrounded by 6 and 17, and the positioning pins are positioned at predetermined positions. Reference holes 18, 19 and 20, 2 for mounting positioning
1 are provided at two locations each. Note that the device is provided with a pair of height positioning pins that oppose the positioning pins and support the flat surface of the disk cartridge to determine the height position.

In addition, write protection member mounting portions 9, 9 are provided at the corner portions of the other half of the upper half 1 and the lower half 2 where the reference holes 19, 21 are provided, so as to be located on the sides of these reference holes 19, 21. It is provided. A write protection member 22 having a write protection portion 22a at its tip is slidably attached to these write protection member attachment portions 9, 9. By sliding the write protection member 22, the position of the write protection member 22a facing the through holes 9a, 9a of the write protection member mounting portions 9, 9 is changed, and a write-protection state or a write-enabled state is formed. .

Then, the rear side positions near the reference holes 18, 19 and 20, 21 provided in the upper half 1 and the lower half 2, and the rising walls 10, 11 at both corners of the front side where the shutter 8 is attached, and the circular arc shape. rib 1
In the area surrounded by 6 and 17, the above upper half 1
A pair of screw fixing portions 23, 24 and 25, 26 are provided, respectively, into which screws 3 for coupling and fixing the lower half 2 are screwed.

A pair of screw fixing parts 23 and 24 provided in the vicinity of the reference holes 18, 19 and 20, 21 are a cylindrical boss part 28 provided with a bottomed screw hole 27 protruding from the inner surface of the lower half 2; 29 and boss holders 33, 34 which are provided with boss receiving recesses 30, 31 at their tips into which the tips of the boss portions 28, 29 protruding from the inner surface of the upper half 1 are fitted, and screw insertion holes 32 are provided.
It consists of Then, one screw fixing part 2
The boss receiving recess 30 provided at the tip of the boss holder 33 constituting part 3 is formed into a circular shape with approximately the same diameter as the tip diameter of the boss portion 28 that fits therein, and the boss portion 28 is lightly press-fitted therein. It is formed so that it can be positioned and fitted.

Further, the screw fixing parts 25 and 26 provided on the front side of the upper half 1 and the lower half 2 are attached to the lower half 2.
Cylindrical boss portions 37 and 38 are provided with bottomed screw holes 36 that protrude from the inner surface of the upper half 1, and screw insertion holes 39 that are butted against the boss portions 37 and 38 that protrude from the inner surface of the upper half 1 are provided. It is composed of cylindrical boss parts 41 and 42.

As mentioned above, the screw fixing parts 23, 24 and 25,
The upper half 1 and the lower half 2 provided with the reference holes 18, 19 and 20, 21 accommodate the disk 5 and are provided with the reference holes 18, 19 and 20, 21.
The boss portions 28, 2 of the screw fixing portions 23, 24 on the side
9 into the boss receiving recesses 30, 3 of the boss holders 33, 34.
By being press-fitted to 1, they are brought into contact with each other and temporarily fixed, and further positioning is performed. Here, by screwing the screws 3 into the screw fastening parts 23 and 24 and the screw fastening parts 25 and 26 on the front side, the cartridge main body 4 is connected and fixed as shown in FIG. 4, and the disk 5 is rotatably housed therein. is formed.

Furthermore, on the outer surface along the front side edge where the openings 6 and 7 of the upper half 1 and the lower half 2 are provided,
Guide grooves 44 and 45 are provided for slidingly guiding the shutter 8 that opens and closes the openings 6 and 7.

The shutter 8 is slidably attached via the guide grooves 44 and 45, which are provided oppositely on the upper and lower surfaces of the cartridge main body 4.
By bending a metal plate such as a stainless steel plate into a roughly U-shape,
It is formed as shown in FIGS. 5A, B and C. That is, this shutter 8 has the openings 6 and 7 and the disk table insertion hole 1 on both sides of the continuous piece 46.
An upper shutter portion 47 and a lower shutter portion 48 that are sufficient to simultaneously cover 2 and 13 are provided by bending them to face each other, and a connecting portion of the upper shutter portion 47 and lower shutter portion 48 to the connecting piece 46 is provided. The side and the connecting piece 46 form a slide guide portion 49. The slide guide portion 49 extends further from one side of the upper shutter portion 47 and the lower shutter portion 48 in the direction of the guide grooves 44 and 45. Therefore, the shutter 8 has a substantially L-shaped planar shape as shown in FIG. 5A.

Then, the slide guide portion 4 of the shutter 8
The guide groove 4 is formed at both ends of the slide guide portion 49 by cutting and raising a part of the slide guide portion 49 inward.
a guide piece 50 that is engaged with and guided by 4 and 45;
50, 52, and 52 are provided on both upper and lower surfaces, respectively, facing each other. These guide pieces 50, 50
and 52, 52 are bent to have a substantially L-shaped cross section as shown in FIG. It is formed with a width that substantially corresponds to the width. The guide piece 50 formed in this way,
50 and 52, 52 are the guide grooves 44, 45
By being engaged with, the shutter 8 is prevented from coming off from the cartridge main body 4.

Furthermore, protrusions 54 and 55 are formed by drawing between the guide pieces 50 and 50 and between the guide pieces 52 and 52, and the slide guide portion 49
This is to prevent bending in the thickness direction, which occurs because the shutters are formed longer than the widths of the upper and lower shutter portions 47, 48.

Further, the connecting piece 46 of the shutter 8 has a locking member 56 of the shutter 8 provided on the cartridge body 4 when the shutter 8 is in the closed lid position.
A bent portion 57 for locking that engages with the recording/reproducing device is cut and bent, and a lock release pin insertion hole 58 into which a lock release pin 68 provided on the recording/reproducing device is inserted and engaged is bored. . That is, the bending piece 57 is formed as a protrusion that protrudes inward of the cartridge main body 4, and
The tip end corner portion is arcuate to prevent damage to the cartridge body 4 by contacting a portion of the cartridge body 4 when the shutter 8 slides, and to ensure smooth sliding. Further, the lock release pin insertion hole 58 is located on the free end side of the locking member 56 with respect to the bent portion 57, and is provided close to the bent portion 57.

On the front side surfaces of the upper half 1 and the lower half 2 on which the slide guide portion 49 of the shutter 8 formed as described above slides, there is a slide groove 43 on which the lock release pin 68 and the bent portion 57 for being locked slide. Slide recesses 59 and 60 are provided. In the upper half 1 and the lower half 2, the shutter 8 is formed with slotted grooves extending from the guide grooves 44 and 45 to the front side surface.
Elastic displacement pieces 61, 62 and 63, 6 correspond to the guide pieces 50, 50 and 52, 52 provided in the
4 is formed. These elastic displacement pieces 61, 6
The outer surfaces of 2, 63, and 64 are tapered. The shutter 8 has each guide piece 50,
By fitting the elastic displacement pieces 50, 52, 52 into the front side of the cartridge body 4 in correspondence with the elastic displacement pieces 61, 62, 63, 64, these elastic displacement pieces 6
1, 62 and 6364 are the guide pieces 50, 50
and 52, 52, these guide pieces 50, 50 and 52, 52 are bent by the guide grooves 44,
As shown in FIG. 6, it is slidably mounted so as to easily engage with the openings 6 and 45 to open and close the openings 6 and 7.

Further, concave portions 65 and 66 are formed from the front side to the outer side of the upper half 1 and the lower half 2 to restrict the sliding range of the shutter 8, as shown in FIGS. 2B and C and 3B and C. has been done.

Further, a bent portion 57 for locking is engaged with the inner corner portion on the front side of the upper half 1 when the shutter 8 is in the position where the openings 6 and 7 of the cartridge body 4 are closed. A locking member 56 made of synthetic resin and having a locking recess 67 for locking the shutter 8 is attached. As shown in FIG. 7, this locking member 56 has a mounting base formed of synthetic resin and provided with fitting holes 70, 70 for fitting into a pair of mounting pins 69, 69 protruding from the inner surface of the upper half 1. It is constructed by extending a lock release pin pressed portion 73 as a movable portion which is movably displaced from one side of the lock release pin 71 via an elastic displacement portion 72 which is curved into a semicircular shape. A lock recess 67 with which the bent portion 57 of the shutter 8 engages is formed in the middle of one side of the lock release pin pressed portion 73. As shown in FIGS. 8 and 9, the bent portion 57 enters and is inserted into one side of the lock release pin pressed portion 73 on the free end side of the lock recess 67 when the shutter 8 is slid. A slit-like passage 74 is bored. The passage 74 is formed with a depth and width that prevents the bent portion 57 from coming into contact with the shutter 8 when it slides. Further, the passage 74 is formed to have a width smaller than the width of the lock release pin 68 provided on the recording/reproducing device side that presses the locking member 56.

The passage 7 of the lock pin pressed portion 73
The upper surface side of the portion where 4 is formed is a surface to be pressed by the lock release member which is pressed by the lock release pin 58 as the lock release member.

Note that by shifting the locus of the lock release pin 68 from the passage 74, the passage 74 can be formed to have a wider width than the lock release pin 68. Furthermore, the rising surface of the passage 74 on the side of the lock recess 67 is formed as an inclined surface part 74a, and when the shutter 8 is attached to the cartridge body 4, the shutter 8 is fitted into the cartridge body 4 without being locked with respect to the lock member 56. Then, when sliding the shutter 8 and locking it into the locking member 56, the bent portion 57
The lock recess 67 easily rides on the lock and engages with the lock recess 67. That is, the shutter 8 is configured to be locked to the locking member 56 by manual operation without bending the locking member 56.

Further, one side of the free end of the locking member 56 is
When pressed by the lock release pin 68 which is formed into the inclined portion 75 and is provided on the recording/reproducing device side,
It is designed to be gradually elastically displaced and gradually elastically returned. Although this inclined portion 75 is formed as a straight inclined surface in the illustrated example,
It may be curved in an arc shape.

Further, in the middle part of the other side of the lock release pin pressed part 73, the lock is released by engaging with an engaging part 76 formed by cutting out a part of the rising wall 10 formed on the front side of the upper half 1. The locking member 56 prevents the pin pressed portion 73 from elastically displacing outward of the cartridge body 4 and from excessively elastically displacing toward the free end.
A substantially L-shaped locking piece 77 is provided in a protruding manner for protection.

The locking member 56 formed as described above is constructed by fitting the mounting base 71 to the mounting pins 69, 69 through the fitting holes 70, 70 with the elastic displacement portion 72 facing inside the slide recessed portion 59. Installed as shown in Figure 2A.

In addition, the elastic displacement pieces 61, 62 and 63, 64 provided on the upper half 1 and lower half 2 described above
In this case, the shutter 8 is connected to the openings 6 and 7 for pick-up.
When the shutter 8 is in the open position to open the
The guide pieces 50, 50 and 52, 52 are provided so as to correspond to each other. Therefore, the shutter 8 is fitted into the cartridge body 4 as shown in FIG. 10 in an unlocked state that does not correspond to the locking member 56.
Then, by sliding the shutter 8 in the direction of the arrow in FIG. 10, the bent portion 57 rides on the inclined surface portion 74a in the passage 74, bending the locking member 56, and engaging the locking recess 67. With the openings 6 and 7 for
It is installed as shown in Figure 1. As described above, since the shutter 8 is installed at a position shifted from the lock position and then locked by the locking member 56, the disk cartridge in which the shutter 8 is in the open state when not installed in the device is not used. Even if the product is accidentally dropped and receives a shock,
It is possible to reliably prevent the shutter 8 from coming off.

Next, the locking operation and unlocking operation of the shutter 8 to the locking member 56 in the disk cartridge configured as described above will be explained.
When the above-mentioned disk cartridge is installed in a recording/reproducing device, a lock release pin 6 provided inside the device is released.
8 enters into the cartridge main body 4 through the lock release pin insertion hole 58 and presses the lock release pin pressed member 73 of the lock member 56 as shown in FIG. 13 to elastically displace it. When this lock release pin pressed portion 73 is pressed, the bent portion 57 of the shutter 8
is removed from the lock recess 67. Next, while the lock release pin 68 is engaged with the lock release pin insertion hole 58, the shutter 8 is slid in the direction of opening the lid, and when it reaches the vicinity of the inclined part 75 of the lock release pin pressed part 73, the bent part 57 is inserted into the passage. 74. Further, when the lock release pin 68 reaches above the inclined portion 75 as shown in FIG.
6 returns elastically. The bent portion 57 then enters the passage 74, and in this state the shutter 8 is slid to open the pickup openings 6 and 7 as shown in FIG.

Further, when the shutter 8 is opened with the openings 6 and 7 opened, the operation to close the shutter 8 is performed in the opposite manner to the above-mentioned operation. First, the shutter 8 is slid toward the locking member 56. When it is bent, the bending part 5
7 enters the passage 74, then the lock release pin 6
8 rides on the inclined part 75 and gradually locks the locking member 56.
to bend. Then, when the shutter 8 is slid by moving until the lock release pin 68 reaches the state shown in FIG. 13, in which the lock release pin 68 reaches the position shown in FIG.
The bent portion 57 moves to a position corresponding to the lock recess 67. When the lock release pin 68 is removed from the lock release pin insertion hole 58, the lock member 56 elastically returns, the bent portion 57 engages with the lock recess 67, and the shutter 8 is locked.

<Effects of the invention> As described above, in the present invention, the hole portion constituting the pin insertion hole provided in the continuous piece of the shutter into which the lock release member such as the lock release pin is inserted and engaged is
Since the protrusion of the lock member that engages with the lock recess is located closer to the open position of the shutter, the movable part of the lock member has a free end facing the mounting base to the cartridge body. By pressing the pressed surface portion of the lock release member located at and displacing the movable portion inward into the cartridge main body, the relative engagement between the protrusion and the lock recess is released, and the opening of the shutter Since the shutter is moved in the direction of the open position, the relative engagement between the protrusion and the lock recess can be easily and reliably released, and the opening of the shutter can be opened using the lock release member. It is possible to realize stable sliding operation in the direction.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the disk cartridge according to the present invention, FIG. 2A is a plan view showing the inner surface of the upper half, and FIG. 2B is a B of FIG.
-B sectional view, and FIG. 2C is a plan view showing the outer surface side of the upper half. Figure 3A is a plan view showing the inner surface of the lower half, and Figure 3B is the B of Figure 3A.
-B sectional view, and FIG. 3C is a plan view showing the outer surface side of the lower half. FIG. 4 is a longitudinal sectional view of the cartridge body. 5A is a plan view of the shutter, FIG. 5B is a front view of the shutter, and FIG. 5C is a sectional view of the shutter. FIG. 6 is a perspective view of the disk cartridge according to the present invention with the shutter in the closed state. FIG. 7 is a perspective view of the lock member, FIG. 8 is a side view thereof, and FIG.
The figure is a plan view thereof. FIG. 10 is a plan view of the main part showing the shutter attached to the cartridge body in an unlocked state, and FIG. 11 is a plan view of the shutter in a locked state. Fig. 12 is a perspective view showing the relationship between the shutter lock member and the shutter when the shutter is unlocked and moved to the opening opening position side, and Fig. 13 is a perspective view showing the relationship between the shutter lock member and the shutter when the shutter lock member is pressed by the lock release pin. FIG. 3 is a perspective view showing the relationship between the shutter lock member and the shutter in the state of the shutter. FIG. 14 is a perspective view showing the shutter opening operation. FIG. 15 is a plan view of the main parts showing the shutter mounting structure which is the premise of the present invention. 1... Upper half, 2... Lower half, 4... Cartridge body, 5... Disk, 6, 7... Opening for pick-up, 8... Shutter, 56...
Locking member, 57...Bending portion for locking, 67
...Lock recess, 68...Lock release pin, 73
……Lock release pin pressed part.

Claims (1)

[Scope of Claim for Utility Model Registration] A cartridge body that rotatably houses a disk and is provided with an opening through which a recording/reproducing means for recording or reproducing information signals on the disk is provided; a front surface of the cartridge body; The opening is opened and closed by sliding in parallel, and a connecting piece facing the front surface of the cartridge body is provided with a hole for engaging a lock release member and a protrusion that protrudes toward the inside of the cartridge body. The shutter and the mounting base are fixedly attached to the cartridge body, and a movable part that is movable and has a locking recess formed in the middle part with which the protruding part of the shutter is relatively engaged is moved from the position where the shutter closes the opening. and a locking member extending from the mounting base so as to extend in a sliding direction to open the opening, the shutter being slid to a closed position closing the opening. When the protruding portion engages with the locking recess and is locked by the locking member, the movable portion is pressed by an unlocking member provided on the recording/reproducing device that is inserted through the hole. By pressing and displacing the movable portion inward into the cartridge main body, the relative engagement between the protrusion and the lock recess is released, and the opening is moved from the closed position where the opening is closed by the lock release member. In a disk cartridge that is slid in the direction of the open position, the upper surface of the free end side from the position where the recess of the movable part is provided is the pressed surface of the lock release member, and the lock release member is provided on the continuous piece. A disk cartridge having a hole for engaging a lock release member located at an open position side of the protruding portion where the opening is opened.