JP4423943B2 - Disc cartridge - Google Patents

Description

  The present invention relates to a disk cartridge containing a disk-shaped recording medium such as an optical disk.

  2. Description of the Related Art Conventionally, disk cartridges that store a disk-shaped recording medium such as an optical disk in a rotatable manner and are mounted on a recording and / or reproducing apparatus while the disk-shaped recording medium is stored are widely used. In this type of disc cartridge, the disc-shaped recording medium is housed in the cartridge main body, so that the disc-shaped recording medium can be protected and can be easily inserted into and removed from the recording and / or reproducing apparatus.

  Since the disc cartridge can be mounted on the recording and / or reproducing apparatus while the disc-shaped recording medium is stored in the cartridge main body, a part of the disc-shaped recording medium is placed on the inner and outer circumferences of the cartridge main body. An opening for recording and / or reproduction facing outside is provided. A recording / reproducing head unit such as an optical pickup provided on the recording and / or reproducing device side faces the disc-shaped recording medium through the recording / reproducing opening, and a signal recording area of the disc-shaped recording medium is defined. The information signal is recorded or reproduced by scanning.

  By the way, if the recording and / or reproducing opening provided in the cartridge main body is left open, dust or the like may enter the cartridge main body when not in use such as storage that is not attached to the recording and / or reproducing apparatus. In addition, the disc-shaped recording medium stored in the cartridge body may be soiled.

  Therefore, a disk cartridge that houses a disk-shaped recording medium is provided with a shutter member for closing the recording and / or reproducing opening. In the disk cartridge provided with the shutter member, the recording member and / or reproducing opening portion is used to prevent the recording and / or reproducing opening portion from being opened when not in use such as during storage. There is provided one provided with a spring member for urging so as to close.

  Japanese Patent Laid-Open No. 9-91915 (see Patent Document 1) discloses a disk cartridge provided with a biasing member such as a spring member for biasing a shutter member in a closing direction for closing a recording and / or reproducing opening. There is something.

  By the way, conventionally provided disk cartridges including a shutter member, including those described in Patent Document 1, the shutter member exclusively closes the recording member and / or the reproducing opening by the biasing member. It is biased only in the closing direction.

  As described above, in order to reliably open the recording and / or reproducing opening which is blocked by the shutter member biased only in the closing direction, the shutter is further opened from the position where the recording and / or reproducing opening is opened. An overstroke for moving the member in the opening direction is required. As a result, the moving area of the shutter member becomes large, and it is difficult to reduce the size of the disk cartridge. When the disc cartridge having such an overstroke is mounted on a recording and / or reproducing apparatus and the shutter member is held in the open position against the urging force of the urging member, backlash occurs. Such a shutter member vibrates even with a slight impact, and it is difficult to hold the shutter member in an open position in a stable state. Such vibration of the shutter member affects the recording / reproducing characteristics of the recording and / or reproducing apparatus, and there is a possibility that good recording / reproducing characteristics may not be obtained.

  Further, in the recording and / or reproducing apparatus using the disk cartridge provided with the urging member that urges the shutter member only in the closing direction, as described above, the recording member and / or reproducing opening is provided on the shutter member. Since the holding mechanism for holding the biasing member against the biasing force of the biasing member is provided at the opened position, the mechanism on the recording and / or reproducing apparatus side becomes complicated. Further, the holding mechanism requires a mechanism having a holding force sufficient to hold the shutter member in the open position against the urging force of the urging member that urges the shutter member. Therefore, it is difficult to reduce the size and weight of the device itself.

JP-A-9-91915 JP-A-10-64222

  A disc cartridge for selectively energizing the shutter member in the opening direction or the closing direction by attaching a torsion coil spring to the disc main body so as to be rotatable and attaching one end to the shutter member. Has been proposed. In this type of disk cartridge, the torsion coil spring reverses in accordance with the opening / closing operation of the shutter member, so that the urging direction of the torsion coil spring is reversed. Therefore, when the shutter member is moved in the opening direction, recording and / or reproduction is performed. The opening is biased and held at a position to open, and when the shutter member is moved in the closing direction, the recording and / or reproducing opening is biased and held at a position.

  Since it is difficult to load such a torsion coil spring into the cartridge after the upper and lower halves constituting the cartridge body are abutted and joined together, it is preloaded in the cartridge body in a freely rotatable manner, and then the shutter member is attached to the shutter member. The process of attaching is taken.

  However, the process of attaching the torsion coil spring to the shutter member simultaneously with the assembly of the shutter member to the cartridge body is complicated, and it is necessary to prevent the torsion coil spring from being detached from the shutter member during the opening and closing operation of the shutter member.

  Accordingly, the present invention simply attaches a torsion coil spring that selectively urges a shutter member that opens and closes a recording and / or reproducing opening of a cartridge main body containing a disk-shaped recording medium in an opening direction and a closing direction, and shutters the shutter member. It is an object of the present invention to provide a disc cartridge in which a member and a torsion coil spring are securely engaged.

  A disc cartridge according to the present invention proposed to achieve the above-described object includes a disc-shaped recording medium and the disc-shaped recording medium rotatably accommodated, and a part of the disc-shaped recording medium is arranged on the inner and outer circumferences. A cartridge main body provided with a recording and / or reproducing opening that faces outward, and a slit that is movably supported by the cartridge main body and that is partially open at one end in the moving direction. A formed locking hole is formed, a shutter member that opens and closes the recording and / or reproducing opening, a first coil portion is provided in the middle portion, and a pair of arm portions from the first coil portion. A second coil portion is provided at the distal end of one of the arm portions so as to be rotatably supported by a part of the cartridge main body. The extension portion extended from the other arm portion and / or the bent portion bent in parallel with the extension portion has a predetermined angle with the extension direction of the other arm portion. A stop portion is formed, and the locking portion is locked in the locking hole formed in the shutter member, so that the shutter member closes the recording and / or reproducing opening or the recording direction. And / or a torsion coil spring that selectively biases in any of the opening directions for opening the reproduction opening.

  In the torsion coil spring used in the disk cartridge according to the present invention, the first coil portion and the second coil portion are wound in a plurality of directions with their winding directions reversed.

  In addition, the torsion coil spring used in the disk cartridge according to the present invention has a direction in which the shutter member is recorded and / or the opening for recording and / or recording and / or reproduction depending on the position of the shutter member with respect to the recording and / or reproduction opening. And / or selectively biasing to any one of the positions where the reproduction opening is opened.

  Here, the torsion coil spring is provided on the upstream side in the moving direction in which the shutter member opens the recording and / or reproducing opening.

  Further, the cartridge main body constituting the disc cartridge according to the present invention has a substantially semicircular arc-shaped portion whose insertion end side to the recording and / or reproducing apparatus is centered on the center of the disc-shaped recording medium housed in the cartridge main body. The recording and / or reproducing opening is formed so as to face a side surface other than the side surface of the cartridge body that is an arcuate portion. In the disk cartridge having this configuration, the side surface on which the shutter member moves is a surface parallel to the moving direction of the shutter member.

  According to the disk cartridge of the present invention, during the opening / closing operation of the shutter member, the torsion coil spring and the shutter member are bent at the end of the engaging portion formed on the other arm portion of the torsion coil spring. Is extended to the lower surface side of the shutter member, so that the bent portion of the locking portion contacts the lower surface portion of the shutter member even when the torsion coil spring or the shutter member is swung during the opening / closing operation of the shutter member. This prevents the torsion coil spring from being disengaged from the shutter member.

  Further, by forming the locking portion of the torsion coil spring so as to be bent at a predetermined angle at two points of the extended portion and the bent portion, the extended portion is extended to the upper surface side of the shutter member, and the bent portion Is extended to the lower surface side of the shutter member. Therefore, even when the torsion coil spring or the shutter member is swung in the vertical direction during the opening and closing operation of the shutter member, the extending portion of the locking portion is in contact with the upper surface portion of the shutter member, and the bent portion is the shutter member. Therefore, the engagement between the torsion coil spring and the shutter member is more effectively prevented.

  In the disk cartridge according to the present invention, the shutter member is urged by the torsion coil spring. Therefore, the shutter member is urged to the position where the recording and / or reproduction opening is closed or opened by the torsion coil spring. Therefore, without providing a mechanism for holding the shutter member on the recording and / or reproducing apparatus side, the recording and / or reproducing opening is held in the closed position or the opened position, and the recording and / or reproducing is surely performed. Alternatively, the regeneration opening can be closed and opened.

  The torsion coil spring opens the recording member and / or reproducing opening or the recording member and / or reproducing opening depending on the position of the shutter member relative to the recording and / or reproducing opening. Since it is selectively urged in one of the directions, the shutter member closes or opens the recording and / or reproducing opening in connection with the insertion and removal of the disk cartridge from the recording and / or reproducing apparatus. The recording and / or reproducing opening can be reliably closed and opened.

  In the disc cartridge according to the present invention, the shutter member is biased in the opening direction in addition to the direction of closing the recording and / or reproducing opening by the torsion coil spring, so that the shutter member is moved to the open position. It is not necessary to provide an overstroke for the shutter member, and the movement area of the shutter member can be small. As a result, the disk cartridge itself can be reduced in size.

  Further, in the disk cartridge according to the present invention, the torsion coil spring is disposed on the upstream side in the moving direction in which the shutter member opens the recording and / or reproducing opening, so that the space of the cartridge body is effectively used. It can arrange | position and can contribute to size reduction.

  Furthermore, since the recording and / or reproducing apparatus using the disk cartridge according to the present invention does not require a mechanism for holding the shutter member in the open position, the mechanism of the recording and / or reproducing apparatus can be simplified. Thus, the device itself can be reduced in size.

  Furthermore, the disc cartridge according to the present invention has the recording body of the cartridge main body containing the disc-shaped recording medium and / or the insertion end of the cartridge main body centered on the center of the disc-shaped recording medium accommodated in the cartridge main body. Since it is a semicircular arc-shaped portion, it can be reduced in size according to the size of the disc-shaped recording medium to be stored, and the side surface where the recording and / or reproducing opening is the arc-shaped portion of the cartridge body The shutter member can be attached to the cartridge main body so as to be stably movable, and the recording and / or reproducing opening can be reliably closed.

  Furthermore, the disk cartridge according to the present invention includes a torsion coil spring, a first coil portion provided in the middle portion, a pair of arm portions extending from the first coil portion, and a distal end of one arm portion. If the torsion coil spring provided with the second coil part wound in the direction opposite to the winding direction of the first coil part is formed, the thickness of the entire torsion coil spring can be suppressed and the disk cartridge can be made thinner. it can.

  Hereinafter, a disk cartridge according to the present invention will be specifically described with reference to the drawings.

  A disk cartridge 1 according to the present invention is a disk-shaped recording medium, for example, an optical disk 2 that is rotatably accommodated. As shown in FIGS. 1 and 2, a pair of upper and lower halves 3 and 4 are joined together. The cartridge body 5 is provided, and the optical disk 2 is rotatably accommodated in the cartridge body 5.

  The disc cartridge 1 according to the present invention contains, for example, an optical disc 2 on which program data for executing a television game and video data are recorded, and is extremely small. The disc cartridge 1 contains, for example, a small-diameter optical disc 2 having a diameter of about 60 mm, and is formed in a size that can be accommodated in the palm of one hand.

  The disc cartridge 1 shown here contains a read-only optical disc 2 in which information signals such as program data are recorded in advance.

  The upper and lower halves 3 and 4 constituting the cartridge body 5 for storing the optical disk 2 are formed by molding a synthetic resin material, and rising peripheral walls 3a and 4a are formed on the outer periphery. The upper and lower halves 3 and 4 are joined by abutting each of the rising peripheral walls 3 a and 4 a, thereby constituting a disk housing portion 6 and constituting a cartridge body 5. The upper and lower halves 3 and 4 constitute a cartridge main body 5 by joining welding protrusions projecting on opposite inner surfaces of the upper and lower halves 3 and 4 using a welding method such as an ultrasonic welding method.

As shown in FIGS. 1 to 3, the cartridge main body 5 constituting the disk cartridge 1 has an arcuate portion on the front surface, which is a side surface on the insertion end side of the disk drive device into which the disk cartridge 1 is inserted and removed. 7 is formed. As shown in FIG. 2, the arc-shaped portion 7 is formed in a substantially semicircular arc shape with the radius R ₁ being constant with the center P ₀ being the center of the optical disc 2 accommodated in the disc accommodating portion 6 of the cartridge body 5. Has been. That is, the arcuate portion 7 is formed as a semicircle that faces a portion corresponding to a semicircle of the optical disk 2 stored in the cartridge body 5.

  Opposite side surfaces that are continuous with the arc-shaped portion 7 of the cartridge body 5 are formed as side surfaces 8 and 9 that are parallel to each other, and a back surface that faces the arc-shaped portion 7 is gently curved and formed as a continuous curved portion 10. Has been.

  In the disk cartridge 1 according to the present invention, the front surface, which is one side that becomes the insertion end side, is formed as a substantially semicircular arc-shaped portion 7 that is largely curved as compared with the other surface. When inserting into a disk drive device that is inserted and removed by the method, the direction of insertion into the disk drive device can be easily determined. In particular, with the disc cartridge 1 that is small enough to be stored in the palm, it is possible to identify the insertion direction even if it is grasped by hand, so that it can be inserted into the disc drive device accurately, preventing erroneous insertion. It is also possible to do. In addition, as will be described later, the disc cartridge 1 can be easily inserted into a slot-in type disc drive apparatus and can be surely inserted.

  Furthermore, the disc cartridge 1 according to the present invention has a substantially semicircular arc-shaped portion 7 on the insertion end side and a curved portion 10 on the back surface facing the arc-shaped portion 7. Further downsizing has been realized.

  As shown in FIGS. 2 and 3, the center hole 11 formed at the center of the optical disk 2 housed in the cartridge body 5 and the periphery thereof are externally attached to the center of the lower half 4 constituting the lower surface side of the cartridge body 5. A circular central opening 12 is formed so as to face the direction. A part of the disk rotation drive mechanism provided on the side of the disk drive device in which the disk cartridge 1 is mounted, for example, a turntable, enters the central opening 12.

  As shown in FIGS. 2 and 3, a head opening 13 which is a recording and / or reproducing opening is formed in the lower half 4 constituting the lower surface side of the cartridge body 5. The head opening 13 is located on one side surface 8 of the cartridge body 5 and is large enough to allow a part of the signal recording area of the optical disk 2 accommodated in the cartridge body 5 to face outward over the inner and outer circumferences. It is formed in a rectangular shape. In other words, the head opening 13 is formed facing the side surface 8 that is a straight flat surface other than the front surface where the arc-shaped portion 7 of the cartridge body 5 is formed.

  In the disk cartridge 1 according to the present invention, a shutter member 15 for opening and closing the head opening 13 is movably attached. The shutter member 15 is formed by punching and bending a thin metal plate or by molding a synthetic resin material. The shutter member 15 has a flat shutter portion 16 formed in a rectangular shape large enough to close the head opening 13 and a U-shaped cross section formed on the substrate portion side of the shutter portion 16. And a formed support portion 17.

  The shutter member 15 is supported so as to be movable in the arrow A direction or the arrow B direction in FIG. 2 to open and close the head opening 13 by supporting the upper half 3 side constituting the cartridge body 5 by the support portion 17. Has been. That is, as shown in FIG. 4, the shutter member 15 is movable to the cartridge body 5 by supporting the slide guide portion 18 formed by a part of the rising peripheral wall 3 a formed in the upper half 3 by the support portion 17. It is attached.

  As shown in FIGS. 4 and 5, a connecting piece 21 is formed on the support portion 17 provided on the shutter member 15 so as to rise vertically from the base end portion of the shutter portion 16. A first engagement piece 22 that is bent toward the shutter portion 16 side is provided at the distal end portion of the first engagement portion 22. Further, the connecting piece 21 has a second engaging piece 23 bent in an L shape at a position one step lower than the portion where the first engaging piece 22 is formed on the downstream side in the moving direction of the shutter member 15. Is provided. The second engagement piece 23 is formed with a bent portion 23a that is bent in an L shape so that the tip end side protrudes toward the first engagement piece 22 side.

  Further, the connecting piece 21 is provided with a coil spring mounting piece 26 in which a locking hole 27 for locking a locking portion 33 of a torsion coil spring 29 described later is formed on the upstream side in the moving direction of the shutter member 15. The coil spring mounting piece 26 is formed with a substantially circular locking hole 27 that extends toward the shutter portion 16 and is partially opened. Similarly to the second engagement piece 23, the coil spring attachment piece 26 is formed with a bent portion 26a which is bent in an L shape so that the tip end side protrudes toward the first engagement piece 22 side. .

  The shutter member 15 and the torsion coil spring 29 are inserted into the locking hole 27 by being locked by inserting a locking portion 33 formed on a first arm portion 29a of the torsion coil spring 29 described later from the open end. And are connected.

  As shown in FIG. 2, the shutter member 15 is disposed in the cartridge body 5 so that the shutter portion 16 extends over the head opening portion 13. At this time, as shown in FIGS. 6 and 7, the shutter member 15 engages the first engagement piece 22 provided on the support portion 17 with the engagement groove 24 formed on the side surface of the slide guide portion 18. By engaging the bent portions 23a and 26a formed by bending the second engagement piece 23 and the coil spring mounting piece 26 in an L shape with the distal end side of the slide guide portion 18, the first and second engagements are achieved. The support portions 17 are supported by the pieces 22 and 23 and the coil spring mounting pieces 26. The shutter member 15 supported in this manner is guided by the support portion 17 and moves in the direction of arrow A or arrow B in FIG.

  As shown in FIG. 2, a concave shutter slide portion 19 is formed in an area where the shutter portion 16 of the lower half 4 moves. The shutter slide portion 19 is formed with a depth sufficient to prevent the shutter portion 16 from protruding from the surface of the cartridge body 5.

  Further, in the disk cartridge 1 according to the present invention, as shown in FIGS. 4 and 7, a notch 25 is formed in a portion of the rising peripheral wall 4 a formed in the lower half 4 that faces the head opening 13. Has been released. In other words, the head opening 13 is formed by opening a region extending from the inner peripheral side of the cartridge body 5 to the outer peripheral edge.

  In addition, at least a portion of the slide guide portion 18 formed on the upper half 3 side that faces the head opening 13 is mounted on the cartridge mounting portion in the disk drive device so as to be positioned in the height direction. When the optical disk 2 in 1 is positioned and mounted on the turntable, it is formed as a height H1 that does not protrude from the lower surface 2a facing the lower half 4 of the optical disk 2, as shown in FIG.

  The disk cartridge 1 formed in this manner is configured so that the entire optical pickup, which is a head portion for reading an information signal recorded on the optical disk 2 when the shutter member 15 is moved and the head opening 13 is opened, is a cartridge body. The objective lens for condensing the light beam for scanning the signal recording area of the optical disk 2 when the optical pickup is moved to a position for scanning the outer peripheral side of the optical disk 2 as well as being positioned within the cartridge 5 Other optical block portions can be positioned outside the cartridge main body 5 while being positioned in the main body 5.

  As a result, the disc cartridge 1 according to the present invention can be positioned over the inside and outside of the cartridge body 5 while bringing the optical pickup close to the optical disc 2, so that the signal recording area is formed up to the outer periphery of the optical disc 2. And the recording capacity recorded on the optical disc 2 can be increased. Furthermore, since the optical pickup can be brought close to the optical disc 2, the numerical aperture (NA) of the objective lens can be increased, and the beam spot of the light beam focused on the signal recording area of the optical disc 2 can be reduced. It is possible to improve the recording density of the information signal recorded on. Furthermore, since the recording density can be improved as the recording capacity increases, the diameter of the optical disc 2 that requires a certain amount of recording capacity can be reduced. Furthermore, since the optical pickup 2 can be scanned by positioning the optical pickup so as to extend inside and outside the cartridge body 5, the cartridge body 5 can be downsized, and the disk drive device using the disk cartridge 1 can also be downsized. It becomes possible.

  Further, in the disk cartridge 1 according to the present invention, the shutter member 15 for opening and closing the head opening 13 is attached so as to move along the flat side surface 8 of the cartridge body 5 as shown in FIGS. It has been. Therefore, the shutter member 15 is linearly moved while keeping the support portion 17 along the flat side surface 8, so that a stable movement operation is realized.

  Further, since the head opening 13 is formed at a position facing the flat side surface 8 of the cartridge body 5, the portion where the notch 25 formed on the lower half 4 side is also formed in a straight surface. It is said that. Therefore, even if the opening 13 for the head is formed with the notch 25 and the side 8 facing the outside of the cartridge body 5 is opened, the whole is formed in a rectangular shape and has a straight U-shaped cross section. Therefore, the shutter member 15 having the support portion 17 can be reliably closed.

  Next, a reliable movement of the shutter member 15 in the opening / closing direction of the head opening 13 is realized, and the torsion coil spring 29 that securely holds the shutter member 15 in a position where the head opening 13 is opened or closed. Will be described. One end of the torsion coil spring 29 is locked to the shutter member 15 and the other end is rotatably engaged with the cartridge body. The torsion coil spring 29 urges the shutter member 15 to rotate in the direction of opening or closing the head opening 13 according to the movement position of the shutter member 15 relative to the cartridge body 5.

  As shown in FIGS. 8A and 8B, the torsion coil spring 29 has a first arm portion 29a that is locked to the shutter member 15 via a first coil portion 30 provided at an intermediate portion. A second arm portion 29b supported by a part of the cartridge body 5 is formed.

  The first coil portion 30 is formed with a predetermined thickness by being wound a plurality of times, and the first arm portion 29a is extended from one end side 30a in the thickness direction, and the other in the thickness direction. A second arm portion 29b extends from the end side 30b. Various designs are possible for the wire diameter, the number of turns, and the free angle of the first coil portion 30, but a torsion coil spring having an optimum value is selected.

The first arm portion 29 a extending from the first coil portion 30 has a locking portion 33 that is locked to the shutter member 15 at the distal end portion. The locking portion 33 is bent at a substantially right angle from the extending direction of the extending portion 33a to the winding direction of the first coil portion 30 from the extending portion 33a extending from the distal end portion of the first arm portion 29a. The rising portion 33b and the tip of the rising portion 33b are further composed of a bent portion 33c that is bent substantially in parallel with the first arm portion 29a, and the whole is formed in a substantially U-shape. Bent portion of the engaging portion 33 33c is bent from the extending direction of the first arm portion 29a has a predetermined angle theta _1. The engaging portion 33 supports the torsion coil spring 29 on the shutter member 15 by inserting and engaging the rising portion 33b into the engaging hole 27 formed at the tip of the coil spring mounting piece 26 of the shutter member 15 from the open end. .

Here, the bent portion 33c of the locking portion 33, since the extending direction of the first arm portion 29a is bent to have a predetermined angle theta _1, even when the shutter member 15 is opened and closed The locking portion 33 is prevented from coming off from the locking hole 27. That is, as shown in FIG. 9, in the torsion coil spring 29, the bent portion 33 c extends to the lower surface side of the coil spring mounting piece 26 by bending the tip of the locking portion 33. Therefore, even when the torsion coil spring 29 is swung in the direction of arrow H in FIG. 9 during the opening / closing operation of the shutter member 15 or when the shutter member 15 is swung in the direction of arrow I in FIG. Since the bent portion 33c contacts the lower surface portion of the coil spring mounting piece 26, it is possible to prevent the torsion coil spring 29 and the shutter member 15 from being disengaged.

Further, as shown in FIGS. 10A and 10B, the torsion coil spring 29 has a locking portion 33, and the extending portion 33a and the bent portion 33c have a predetermined angle from the extending direction of the first arm portion 29a. By forming it to be bent with θ ₂ and θ ₃ , it is possible to further prevent the locking hole 27 from coming off. That is, as shown in FIG. 11, the torsion coil spring 29 has an extension portion 33 a formed by bending the distal end portion of the locking portion 33 at a predetermined angle at two points of the extension portion 33 a and the bending portion 33 c. Is extended to the upper surface side of the coil spring mounting piece 26, and the bent portion 33 c is extended to the lower surface side of the coil spring mounting piece 26. Therefore, even when the torsion coil spring 29 or the shutter member 15 is swung in the vertical direction H or I in FIG. 11 during the opening / closing operation of the shutter member 15, the extending portion 33 a of the locking portion 33 is maintained. Since the coil spring mounting piece 26 is abutted against the upper surface portion and the bent portion 33c contacts the lower surface portion of the coil spring mounting piece 26, it is possible to prevent the torsion coil spring 29 and the shutter member 15 from being disengaged.

  As shown in FIGS. 8 and 10, the second arm portion 29 b of the torsion coil spring 29 is formed with a second coil portion 31 for rotatably engaging the torsion coil spring 29 with the cartridge body 5. The second coil portion 31 is formed toward the one end side 30a in the thickness direction of the first coil portion 30 by being wound a plurality of times with the winding direction reversed from that of the first coil portion 30. Has been. The second coil portion 31 is rotatably attached to a support pin 42 protruding from the inner surface of the cartridge body 5. The second coil portion 31 can be designed in various ways with respect to the wire diameter, the number of turns, and the free angle in the same manner as the first coil portion 30 described above, but a torsion coil spring having an optimum value is selected.

  The torsion coil spring 29 is formed by winding the first coil portion 30 and the second coil portion 31 a plurality of times with the winding directions opposite to each other. The main body 5 can be thinned. That is, in the torsion coil spring having a plurality of coil portions, when the winding direction of each coil portion is formed in the same direction, the second coil portion 31 is further moved from the position of the other end side 30b of the first coil portion to the first coil. Since the coil 30 is wound toward the other end 30b in the thickness direction of the portion 30, the thickness of the entire spring is increased by adding the thickness of the second coil portion 31 to the thickness of the first coil portion 30. As a result, the thickness of the cartridge body that houses the torsion coil spring increases. In addition, the thickness of the disk drive device into which such a disk cartridge is inserted and removed increases.

  However, according to the torsion coil spring 29 according to the present invention, the first coil portion 30 and the second coil portion 31 are reversed in the winding direction, so that the second coil portion 31 is the first coil. It is wound toward one end side 30a of the portion 30, and the thickness of the entire spring can be suppressed to the thickness of either the first or second coil portion 30, 31.

  Further, as shown in FIG. 12, the disk cartridge according to the present invention is formed such that the second coil portion 31 of the torsion coil spring 29 is gradually reduced in diameter toward the tip in the thickness direction. The support pin 42 erected on the cartridge main body 5 with which the coil portion 31 engages may also be formed so that the diameter gradually decreases toward the tip in the erection direction.

  That is, the second coil portion 31 of the torsion coil spring 29 is wound so that the diameter D1 on the proximal end side in the winding direction is larger than the diameter D2 on the distal end side in the winding direction and gradually decreases in diameter toward the distal end. Is done. Further, the support pin 42 of the cartridge body 5 with which the second coil portion 31 engages has a diameter D3 on the proximal end side in the standing direction larger than the diameter D4 on the distal side in the standing direction, and as it goes toward the distal end. It is formed so as to gradually reduce the diameter. Further, the diameters D1 and D3 on the base end sides of the second coil portion 31 and the support pin 42 are formed substantially the same, and the diameters D2 and D4 on the tip ends are formed substantially the same. The support pin 42 is formed to be higher than the thickness h of the second coil portion 31, and has a diameter substantially the same as the diameter D2 of the distal end portion of the second coil portion 31 at a height h from the base end portion. D4.

  According to such a disk cartridge 1, the second coil portion 31 is engaged with the support pin 42, whereby a gap is formed in the support pin 42 from the proximal end to the distal end in the winding direction of the second coil portion 31. Therefore, when the torsion coil spring 29 is rotated in accordance with the opening / closing operation of the shutter member 15, it is possible to prevent the second coil portion 31 serving as a rotation fulcrum from rattling. Further, rattling of the torsion coil spring 29 with respect to the cartridge body 5 is prevented, so that the torsion coil spring 29 falls off from the cartridge body 5 during use of the disk cartridge 1 or the torsion coil spring 29 and the shutter member 15 are engaged. Can be prevented from coming off.

  As shown in FIG. 13, the torsion coil spring 29 is disposed on the side where the shutter member 15 moves in the direction of opening the head opening 13. That is, the torsion coil spring 29 is disposed on the upstream side from the position where the shutter member 15 closes the head opening 13 to the position where the shutter member 15 opens.

  By the way, since the upstream side of the moving direction of the shutter member 15 is a direction away from the head opening 13, when the head opening 13 is opened by disposing the torsion coil spring 29 on the upstream side, The torsion coil spring 29 can be prevented from projecting into the head opening 13, and the head opening 13 can be opened largely.

  Furthermore, in the disc cartridge 1 according to the present invention, the upstream side in the moving direction of the shutter member 15 is a corner portion on the back side opposite to the insertion end to the disc drive device, and can be configured as a marginal space. The torsion coil spring 29 can be arranged in the cartridge body 5 efficiently.

  When the shutter member 15 is in a position to close the head opening 13, the torsion coil spring 29 is biased in the direction of arrow B in FIG. 13 so as to maintain the state in which the head opening 13 is closed. When the disk cartridge 1 is inserted into the disk drive device and loaded by the cartridge holder, the shutter member 15 has a guide groove 43 in which a shutter opening operation piece formed on the disk drive device side is formed on the side surface 8 of the cartridge body 5. , The movement in the insertion direction is restricted by contacting the connecting piece 21 of the shutter member 15 from the downstream side of the moving direction of the shutter member 15, and the cartridge main body 5 loaded into the disk drive device is regulated. The head moves in the direction of arrow A in FIG. As a result, the torsion coil spring 29 has the position of the first coil portion 30 formed in the center portion that is not fixed with the support pin 42 to which the second coil portion 31 is rotatably engaged as a rotation fulcrum. The shutter member 15 moves in the arrow A direction. When the first coil portion 30 further moves in the direction of arrow A and the torsion coil spring 29 exceeds the position of the support pin 42 located on the moving direction side of the shutter member 15, the biasing direction is reversed. When the urging direction is reversed, the torsion coil spring 29 urges the shutter member 15 to move in the direction of arrow A in FIG. 14 and moves in the direction of arrow A in the direction of opening the head opening 13. The head opening 13 is held in the open position.

  When an ejection operation is performed to take out the disk cartridge 1 held in the position where the shutter member 15 has opened the head opening 13 from the disk drive device, the shutter member 15 moves to the cartridge body 5 with the operation opposite to the above-described insertion operation. On the other hand, it moves relatively in the direction of arrow B in FIG. 13, and the central first coil portion 30 also moves in the direction of arrow B in the same direction. The torsion coil spring 29 reverses the biasing direction when the shutter member 15 further moves in the direction of arrow B and the first coil portion 30 exceeds the position of the support pin 42 located on the moving direction side of the shutter member 15. . When the urging direction is reversed, the torsion coil spring 29 urges the shutter member 15 to move in the direction of arrow B in FIG. 13 and moves in a direction to close the head opening 13 to thereby open the head opening. 13 is held in the closed position.

  The shutter member 15 urged by the torsion coil spring 29 is supported by the urging force of the torsion coil spring 29 at each of the position where the head opening 13 is closed and the position where the head opening 13 is opened. The state where the head opening 13 is closed or opened can be maintained.

  During the opening / closing operation of the shutter member 15, the torsion coil spring 29 and the shutter member 15 are bent at the distal end of the engaging portion 33 formed on the first arm 29 a of the torsion coil spring 29, so that the bent portion 33 c becomes a coil spring. Since it is extended to the lower surface side of the mounting piece 26, the torsion coil spring 29 is swung in the direction of arrow H in FIG. 9 or the shutter member 15 is swung in the direction of arrow I in FIG. Even when it is moved, the bent portion 33 of the locking portion 33 abuts on the lower surface portion of the coil spring mounting piece 26, so that the engagement between the torsion coil spring 29 and the shutter member 15 is prevented.

  Further, as shown in FIG. 11, the extending portion 33a is formed by bending the locking portion 33 of the torsion coil spring 29 at a predetermined angle at two points of the extending portion 33a and the bent portion 33c. The coil spring mounting piece 26 is extended to the upper surface side, and the bent portion 33 c is extended to the lower surface side of the coil spring mounting piece 26. Therefore, even when the torsion coil spring 29 or the shutter member 15 is swung in the vertical direction H or I in FIG. 11 during the opening / closing operation of the shutter member 15, the extending portion 33 a of the locking portion 33 is maintained. Since it is placed on the upper surface of the coil spring mounting piece 26 and the bent portion 33c contacts the lower surface of the coil spring mounting piece 26, the torsion coil spring 29 and the shutter member 15 are prevented from being disengaged.

  On the other hand, the disk drive device using the disk cartridge 1 does not need to be provided with a mechanism for holding the shutter member 15 at the position where the head opening 13 is opened against the urging force of the urging member. The mechanism of the disk drive device can be simplified, and the device itself can be miniaturized.

  Further, in the disk cartridge 1 according to the present invention, the torsion coil spring 29 opens the head opening 13 or closes it in accordance with the position of the shutter member 15 relative to the head opening 13 provided in the cartridge body 5. Therefore, the head opening 13 can be reliably opened or closed in connection with the insertion / removal of the disk cartridge 1 into / from the disk drive device.

  Furthermore, in the disk cartridge 1 according to the present invention, the shutter member 15 is urged to move to the side where the head opening 13 is opened by the torsion coil spring 29, so that the shutter member 15 is in a position where the head opening 13 is opened. Therefore, it is not necessary to provide an overstroke portion for moving the shutter member 15, the moving region of the shutter member 15 is small, and the disk cartridge 1 itself can be downsized.

  In the disk cartridge 1 according to the present invention, a shutter release operation provided on the side of the disk drive device is provided on one side surface 8 of the cartridge body 5 to which the shutter member 15 is attached, as shown in FIGS. A guide groove 43 into which the piece 63 enters is provided.

  As shown in FIGS. 2 and 3, the first and first positioning pins provided on the disk drive device side are engaged with the lower surface side of the cartridge main body 5 on both sides of the back surface side which is the curved portion 10. Two positioning holes 43 and 44 are provided. The second positioning hole 44 is formed as a long hole having a major axis in the width direction orthogonal to the moving direction of the shutter member 15 in order to adjust the engaging position of the positioning pin.

  Further, as shown in FIGS. 1 and 2, the cartridge loading mechanism provided on the side of the disk drive device in which the disk cartridge 1 is mounted is disposed on the side surfaces 8 and 9 of the arcuate portion 7 of the cartridge body 5 facing each other. The engaging recesses 45 and 46 for loading with which a part of the engaging portion is engaged are provided.

  Furthermore, as shown in FIG. 2, the part located on the other side face 9 side of the arcuate part 7 of the cartridge body 5 is for ejecting part of the ejecting mechanism provided on the disk drive device side. An engaging recess 47 is provided.

  Furthermore, identification holes and identification recesses for identifying the type of the optical disk 2 to be accommodated are provided on the side surfaces 8, 9 or the bottom surface of the cartridge body 5 as necessary.

  In the disc cartridge 1 having the above-described configuration, after the upper and lower halves 3 and 4 are formed by injection molding using polycarbonate or the like, the optical disc 2 and the torsion coil spring 29 are accommodated in predetermined positions, and the upper and lower halves 3 and 3 are stored. After the butt 4 is joined, the shutter member 15 is fitted.

  Specifically, the torsion coil spring 29 is inserted into the support pin 42 erected on the lower half 4 fixed to the jig so that the second coil portion 31 can rotate. Then, the lower half 4 is abutted with the upper half 3 and is ultrasonically welded so that the support pin 42 is supported by the bearing portion 41 formed on the upper half 3 side and is rotatably accommodated in the cartridge body 5. Is done. At this time, as shown in FIG. 15, the torsion coil spring 29 is positioned by protruding the locking portion 33 outward from the side surface 8 of the cartridge body 5 on which the slide guide portion 18 is formed.

  As described above, the shutter member 15 is formed by punching and bending a thin metal plate or by molding a synthetic resin material. The shutter member 15 includes a slide guide portion 18 formed on the side surface 8 of the cartridge body 5 after the locking portion 33 of the torsion coil spring 29 protruding from the side surface 8 of the cartridge body 5 is attached to the coil spring attachment piece 26. Attached to.

  Specifically, the shutter member 15 is configured such that the second engaging piece 23 and the coil spring mounting piece 26 provided on the connecting piece 21 are placed along the tapered surface 35a of the guide rail 35 formed on the upper half 3 side. The portion 16 is extended to the shutter slide portion 19 formed in the lower half 4. Further, the shutter member 15 has a locking hole 27 of the coil spring mounting piece 26 extending from the connecting piece 21, and a rising portion 33 b provided in the locking portion 33 of the torsion coil spring 29 is an open end of the locking hole 27. By being inserted more, it is connected to the torsion coil spring 29. Next, as shown in FIG. 7, the shutter member 15 engages the first engagement piece 22 extended from the connection piece 21 by its own elasticity with the engagement groove 24 of the upper half 3, and the second The bent portions 23a and 26a formed by bending the engaging piece 23 and the coil spring attaching piece 26 are positioned inside the guide rail 35, and are slidably attached to the cartridge body 5 to complete the assembly of the disk cartridge 1.

  In this way, the rising portion 33b is provided in the locking portion 33 of the torsion coil spring 29, and the rising portion 33b is inserted into the locking hole 27 of the coil spring mounting piece 26 having one end opened, whereby the torsion coil spring 29 and the shutter member. 15, the shutter member 15 can be easily assembled to the cartridge body 5. In addition, after the engagement, the extended portion 33 a or the bent portion 33 c provided on the locking portion 33 of the torsion coil spring 29 comes into contact with the coil spring mounting piece 26, whereby the torsion coil spring 29 and the shutter member 15 are engaged. It is made not to come off easily.

  Next, an example of a disk drive device that records and / or reproduces information signals with respect to the optical disk 2 stored in the disk cartridge 1 described above will be described.

  The disc cartridge 1 according to the present invention stores an optical disc 2 on which program data for executing a television game and video data are recorded, for example. Therefore, as a disk drive apparatus using the disk cartridge 1 according to the present invention in which this type of optical disk 2 is housed, the disk cartridge 1 is mounted and at least data recorded on the optical disk 2 is reproduced as shown in FIG. A disk drive device 50 having an apparatus main body 51 incorporating a disk drive unit and a display unit 52 for displaying image data and character data reproduced from the optical disk 2 is used.

  The disk drive device 50 shown in FIG. 16 is provided with a cartridge loading mechanism having a cartridge holder for mounting the disk cartridge 1 in the disk drive unit (not shown) in the apparatus main body 51 incorporating the disk drive unit. It has been. A cartridge insertion / removal port 53 for inserting the disk cartridge 1 into the cartridge holder and ejecting the disk cartridge 1 mounted on the cassette holder is provided on the front surface constituting one side of the apparatus main body 1. The cartridge insertion / removal port 53 is formed as an opening that is large enough to allow the disk cartridge 1 to be inserted and removed, and has a width W2 that is slightly larger than the width W1 of the disk cartridge 1 inserted therein. It is formed in a rectangular shape having a height H2 slightly larger than the thickness T1. A cartridge holder 54 is disposed in the apparatus main body 51 so as to face the cartridge insertion / removal port 53.

  An eject button 55 for ejecting the disc cartridge 1 held by the cartridge holder 54 is provided on one side of the front side of the apparatus main body 51.

  On one side of the upper surface of the apparatus main body 51, for example, operation buttons 56 and 57 of a control switch used when executing a television game are provided, and an image displayed on the display unit 52 is displayed on the other side. A control key 58 for scrolling is provided, and a speaker 59 for emitting an audio signal reproduced from the optical disc 2 is further provided.

  Although not shown, the device main body 51 is provided with a control bobbin such as a playback button for controlling the disk drive unit, a power switch operation button, and the like.

  The display unit 52 is positioned on the back side opposite to the front side where the cartridge insertion / extraction port 53 of the apparatus main body 51 is provided, and is rotatably attached to the apparatus main body 51 via a hinge mechanism 60. . The display unit 52 is superimposed on the upper surface of the apparatus main body 51 by being rotated toward the apparatus main body 51 side. The display unit 52 is configured using a liquid crystal display panel.

  Next, a state where the disk cartridge 1 according to the present invention is mounted on the disk drive device 50 having the above-described configuration will be described.

  In order to mount the disc cartridge 1 in the disc drive apparatus 50, as shown in FIG. 16, the disc cartridge 1 is inserted into the apparatus main body 51 from the cartridge insertion / removal port 53 with the distal end side where the arc-shaped portion 7 is formed as the insertion end, 54.

  By the way, the disk cartridge 1 according to the present invention is formed as a substantially semicircular arcuate portion 7 on the insertion end side with respect to the cartridge insertion / removal port 53. Even when the center line P2 is inserted with a large inclination, it can be smoothly inserted into the cartridge insertion / removal port 53 and securely held in the cartridge holder 54.

  That is, the disc cartridge 1 having the insertion end of the arc-shaped portion 7 having a substantially semicircular shape has a center line P2 in the width direction with respect to the center line P1 in the width direction of the cartridge insertion / removal port 53, as shown in FIG. Is inserted into the cartridge insertion / removal port 53 in a state tilted to about 45 degrees in either the left or right direction, the semicircular arcuate portion 7 side can be largely inserted into the apparatus main body 51. At this time, as shown in FIG. 19, the disk cartridge 1 is centered on a part of the arcuate portion 7 that abuts one of the side surfaces of the cartridge insertion / removal port 53 during the insertion into the cartridge insertion / removal port 53. The posture can be easily corrected by rotating in the direction in which the center lines P1 and P2 coincide. As described above, the disk cartridge 1 according to the present invention can be securely mounted to the cartridge holder 54 even if the insertion direction with respect to the cartridge insertion / removal port 53 is greatly displaced.

  The disc cartridge 1 inserted into the cartridge holder 54 is further inserted into the cartridge holder 54, whereby the shutter member 15 is moved relative to the cartridge body 5 and the head opening 13 is opened. That is, as shown in FIG. 19, when the disc cartridge 1 is inserted partway through the cartridge holder 54, a shutter opening operation piece 63 provided in the cartridge holder 54 is formed on one side surface 8 of the cartridge body 5. It enters the guide groove 43 and abuts the connecting piece 21 of the shutter member 15 from the downstream side in the moving direction of the shutter member 15.

  The disc cartridge 1 is in a state in which the movement of the shutter member 15 relative to the cartridge body 5 is restricted by the shutter release operation piece 63 coming into contact with the connecting piece 21 of the shutter member 15. When the disk cartridge 1 is further inserted from the position shown in FIG. 19 in the direction of arrow E toward the inside of the cartridge holder 54, the cartridge main body 5 moves in the direction of arrow E, and as shown in FIG. Is released.

  When the cartridge main body 5 moves in the direction of arrow E in FIG. 19 where the head opening 13 is opened in a state where the movement of the shutter member 15 is restricted, as shown in FIG. 14 and FIG. The torsion coil spring 29 is biased. When the cartridge body 5 is moved in the direction of arrow E in FIG. 19 and the first coil portion 30 is biased to a position exceeding the position of the support pin 42 located on the moving direction side of the shutter member 15, the torsion coil spring 29 is The urging direction is reversed, and the shutter member 15 is moved in the direction of arrow F in FIG. 19 which is opposite to the moving direction of the cartridge body 5, and the head opening 13 is moved as shown in FIGS. Open. At this time, the shutter member 15 is urged by the torsion coil spring 29 to open the head opening 13, so that the head opening 13 is reliably maintained open.

  The disk cartridge 1 inserted into the cartridge holder 54 with the head opening 13 opened by the operation as described above is positioned and mounted on a cartridge mounting section provided in the disk drive device 50. At this time, the optical disk 2 is positioned and mounted on the disk drive unit. Here, by driving the disk drive unit, the program data recorded on the optical disk 2 is reproduced and the program is executed.

  Then, after the optical disk 2 is reproduced, the disk cartridge 1 loaded in the disk drive device 50 is ejected by operating the eject button 55. When the eject button 55 is operated, the eject operation of the disk cartridge 1 mounted on the cartridge mounting portion is executed. When the ejection operation is executed, further detailed explanation is omitted, but the shutter member 15 is moved relative to the cartridge body 5 by the operation opposite to the operation described above, and the urging direction is reversed to the closing direction. The head opening 13 is closed by the torsion coil spring 29. Simultaneously with the movement of the shutter member 15 to the closing position, ejection from the cartridge insertion / removal port 53 is performed, and the ejection operation of the disk cartridge 1 attached to the disk drive device 50 is completed.

  During the opening / closing operation of the shutter member 15, the torsion coil spring 29 and the shutter member 15, as described above, bend the tip of the engaging portion 33 formed on the first arm 29 a of the torsion coil spring 29 into a U shape. In addition, the extending portion 33a and / or the bent portion 33c are formed at a predetermined angle with the extending direction of the first arm 29a, so that the extending portion 33a and / or the bent portion 33c are coil spring mounting pieces. 26, when the torsion coil spring 29 or the shutter member 15 is swung in the arrow H direction or the arrow I direction in FIGS. 9 and 11 during the opening / closing operation of the shutter member 15. In addition, the extended portion 33 a of the locking portion 33 abuts on the upper surface portion of the coil spring mounting piece 26, and the bent portion 33 c abuts on the lower surface portion of the coil spring mounting piece 26. Engagement of the torsion coil spring 29 and shutter member 15 that is outside is prevented.

  As described above, the disk cartridge according to the present invention has been described with reference to an example in which the insertion end side is formed in a semicircular shape and applied to a disk cartridge that is miniaturized. The present invention is not limited to this, and the above-described disk cartridge can be directly applied to a cartridge body having a rectangular cartridge body and a disk cartridge having recording and / or reproducing openings on both upper and lower surfaces of the cartridge body. The same advantages can be obtained.

  That is, the present invention can be widely applied to a disk cartridge provided with a shutter member that opens and closes a recording and / or reproducing opening provided in the cartridge body.

It is the perspective view which looked at the disc cartridge concerning the present invention from the upper half side. It is the perspective view which looked at the disc cartridge concerning the present invention from the lower half side. FIG. 3 is a plan view seen from the lower half side of the disc cartridge according to the present invention. FIG. 6 is a perspective view showing a shutter member and a cartridge body on which the shutter member is supported. It is a perspective view which shows a shutter member and the torsion coil spring attached to this shutter member. FIG. 3 is a side view showing a side surface of the disc cartridge according to the present invention on a side where a shutter member is attached. It is sectional drawing which shows the state which attached the shutter member to the cartridge main body. It is a figure which shows the torsion coil spring which urges | biases a shutter member. It is a perspective view which shows the torsion coil spring latched by the shutter member. It is a figure which shows the other torsion coil spring which urges | biases a shutter member. It is a perspective view which shows the torsion coil spring latched by the shutter member. It is a figure which shows the another torsion coil spring which urges | biases a shutter member. It is a top view which shows the disc cartridge which the shutter member has obstruct | occluded the opening part for heads. It is a top view which shows the disc cartridge which the shutter member has opened the opening part for heads. It is a figure which shows a mode that a shutter member is attached to a cartridge main body. 1 is a perspective view showing an example of a disk drive device in which a disk cartridge according to the present invention is used. FIG. 5 is a plan view showing a state in which the disk cartridge is inserted with an inclination with respect to the cartridge insertion / removal port of the disk drive device. It is a top view which shows the state in which a disk cartridge inclines in another direction with respect to the cartridge insertion / extraction opening | mouth of a disk drive apparatus. FIG. 4 is a plan view showing a state in which the disc cartridge is inserted into the cartridge holder with the attitude controlled. FIG. 6 is a plan view showing a state in which the disk cartridge is inserted into the cartridge holder, the shutter member is moved, and the head opening is opened.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc cartridge, 2 Optical disc, 5 Cartridge main body, 7 Arc-shaped part, 8 Side surface by which shutter member is supported, 13 Head opening part, 15 Shutter member, 17 Support part, 18 Slide guide part, 29 Torsion coil spring

Claims (6)

A disc-shaped recording medium;
A cartridge main body provided with a recording and / or reproducing opening for accommodating the disk-shaped recording medium in a rotatable manner and allowing a part of the disk-shaped recording medium to face outward over the inner and outer circumferences;
A shutter member that is supported by the cartridge body so as to be movable and has a locking hole formed with a partially opened slit on one end side in the moving direction, and opens and closes the recording and / or reproducing opening. When,
A first coil portion is provided at the intermediate portion, and a pair of arm portions are extended from the first coil portion. A first arm portion is rotatably supported by a part of the cartridge main body at a tip end thereof. 2 coil portions are provided, and the distal end portion of the other arm portion is bent into a substantially U shape, and is extended from the other arm portion and / or bent in parallel with the extended portion. The bent portion is formed with a locking portion having a predetermined angle with the extending direction of the other arm portion, and the locking portion is locked in the locking hole formed in the shutter member, thereby A disk cartridge comprising a torsion coil spring that selectively biases the shutter member in either a closing direction for closing the recording and / or reproducing opening or an opening direction for opening the recording and / or reproducing opening.   2. The disk cartridge according to claim 1, wherein the torsion coil spring has a plurality of windings with the first coil portion and the second coil portion wound in opposite directions.   The torsion coil spring is configured so that the shutter member closes the recording and / or reproducing opening or the recording and / or reproducing opening according to the position of the shutter member with respect to the recording and / or reproducing opening. 2. The disk cartridge according to claim 1, wherein the disk cartridge is selectively biased to any one of the positions where the portion is closed.   2. The disc cartridge according to claim 1, wherein the torsion coil spring is provided on the upstream side in the moving direction in which the shutter member opens the recording and / or reproducing opening.   An insertion end side of the cartridge main body into the recording and / or reproducing apparatus is a substantially semicircular arc-shaped portion centering on the center of the disk-shaped recording medium accommodated in the cartridge main body, and is used for the recording and / or reproducing. 2. The disc cartridge according to claim 1, wherein the opening is formed so as to face a side surface other than the side surface of the cartridge body that is the arcuate portion. 6. The disk cartridge according to claim 5, wherein the side surface on which the shutter member moves is a surface parallel to the moving direction of the shutter member.

Images