JP4682785B2 - Disc cartridge - Google Patents

Description

  The present invention relates to a disk cartridge provided with a mechanism for locking a shutter that opens and closes an opening that exposes a part of a disk serving as a recording medium to the outside.

  Patent Document 1 discloses a cartridge main body in which a first opening for recording and / or reproduction is formed, and a front surface on the insertion end side to the recording and / or reproducing apparatus is formed in a substantially arc shape, and the cartridge main body A rotation wheel in which a second opening corresponding to the first opening of the cartridge main body is accommodated so that the optical disk is stored in a rotatable manner and the stored optical disk is exposed to the outside, and the bottom surface of the cartridge main body When the first opening and the second opening coincide with each other, the first opening and the rotation wheel are located between the rotation wheel and the rotation wheel. A disk cartridge is described that includes a pair of shutter plates that open a second opening. The disk cartridge is further provided with a lock mechanism that locks the rotation of the rotation wheel so that the pair of shutter plates closes the first and second openings.

  This locking mechanism has a locking member that locks the rotation wheel. The lock member is rotatably attached to a support shaft formed on the inner surface of the lower shell constituting the cartridge body, and a lock portion is formed to engage with an engagement recess formed on the outer peripheral portion of the rotation wheel. Yes. The lock member is urged to rotate by a torsion spring in a direction in which the lock portion engages with the engagement recess of the rotation wheel. This torsion spring has one end engaged with the lock member and the other end engaged with the outer peripheral wall of the lower shell, thereby engaging the lock member with the engaging recess formed on the outer peripheral portion of the rotation wheel. It is biased to rotate in the direction of This makes it difficult for the shutter member to open carelessly, making it difficult for foreign matter such as dust to adhere to the optical disk housed inside the cartridge body, and preventing the occurrence of recording and / or reproduction errors.

  The disc cartridge disclosed in Patent Document 1 has an outer peripheral wall that forms an outer peripheral wall on the insertion end side of the lower shell in the recording and / or reproducing apparatus and a side surface in the same direction as the recording direction of the cartridge body in the recording and / or reproducing apparatus. A lock member is disposed in a narrow space surrounded by the outer peripheral wall of the rotation wheel, and the lock member is further rotated and biased in a direction in which the lock portion engages with the engagement recess of the rotation wheel. It is necessary to dispose a spring. In the example of patent document 1, after arrange | positioning a torsion spring in a predetermined place, a lock member is arrange | positioned in a predetermined position from the upper side of a torsion spring. For this reason, when the lock member is disposed at a predetermined position, a locking step is required in which one end of the torsion spring is returned to the inner side against the urging force and locked to the lock member. Therefore, as an assembling process, a collecting process for collecting the other end of the torsion spring that is initially positioned at a predetermined position is required before the locking process. However, this collecting step includes an outer peripheral wall on the insertion end side to the recording and / or reproducing device of the lower shell and an outer peripheral wall constituting the side surface in the same direction as the insertion direction to the recording and / or reproducing device of the cartridge body. It is necessary to carry out in a narrow space surrounded by the outer peripheral wall of the rotation wheel. Further, one end portion of the torsion spring is in close contact with the outer peripheral wall on the recording end of the lower shell and / or the insertion end side to the reproducing apparatus, and is in a state where it is difficult to collect. Therefore, the process of collecting one end of the torsion spring requires precision and is complicated, making it difficult to improve productivity.

JP-A-2005-78675

  The present invention has been made in view of the above-described problems, and its purpose is to simplify the assembly work of the biasing member that biases the locking member that locks the rotation of the rotation wheel in the locking direction. Another object of the present invention is to provide a disc cartridge capable of improving productivity.

Disc cartridge according to the present invention includes a recording and / or the first cartridge body having an opening formed for reproduction, housing a disc while being rotatably housed in the cartridge body, the disk was the housing Positioned between the rotation wheel having the second opening corresponding to the first opening facing the outside and the bottom surface of the cartridge body and the rotation wheel, and interlocking with the rotation of the rotation wheel When the first opening and the second opening coincide with each other, a shutter mechanism that opens the first opening and the second opening, and the inner side of the cartridge body rotate. Engage with the shaft portion that can be attached and the engagement recess formed on the outer peripheral side of the rotation wheel, A locking portion for locking in serial shutter mechanism closes the first opening position, a locking member having a locking release portion which the locking portion is released from being engaged with the engaging recess in the shaft portion An urging member that urges the lock member rotatably attached to the cartridge body in a direction in which the lock portion engages with an engagement recess of the rotation wheel; The biasing member has a coil portion wound around a mounting pin formed on the inner surface of the cartridge body, and a first arm portion and a second arm portion formed on both sides of the coil portion, The first arm portion and the second arm portion are urged in an opening direction to be separated from each other, and an end portion of the first arm portion is locked to the lock member, and the second arm As a result, the lock member is biased in the direction in which the lock portion engages with the engagement recess of the rotation wheel. When the coil portion is wound around the mounting pin before the lock member is attached to the inside of the cartridge body, the end of the second arm is abutted against the rising wall of the cartridge body, and the cartridge At another position of the rising wall of the main body where the end portion of the first arm portion abuts, a projection portion that forms a gap with the end portion of the first arm portion is formed.

  According to the present invention, since the protruding portion is formed at a position that is the rising wall of the cartridge body and intersects the rotation direction of the other end portion of the biasing member, the rising wall and one end portion of the biasing member are A gap is formed between them, and this gap facilitates the repair work of the other end of the urging member, thereby improving the productivity of the disk cartridge.

  Hereinafter, a disc cartridge to which the present invention is applied will be described with reference to the drawings. A disc cartridge to which the present invention is applied is a disc cartridge that can be mounted on a recording and / or reproducing apparatus of a standard size disc cartridge disclosed in Patent Document 1 described above. The disk cartridge of Patent Document 1 uses an optical disk having a diameter of about 12 cm as a recording medium, whereas the disk cartridge to which the present invention is applied corresponds to the above-mentioned Patent Document 2, and is an optical disk of a standard size disk cartridge. An optical disk having a smaller diameter, for example, 8 cm is used as a recording medium. The disk cartridge to which the present invention is applied is small in size and uses a small-diameter optical disk as compared with the disk cartridge of Patent Document 1, and thus has a small recording capacity compared to a standard size disk cartridge, but is excellent in portability.

  As shown in FIG. 1 to FIG. 3, a disc cartridge 1 to which the present invention is applied includes a rotation wheel 4 in which an optical disc 3 is accommodated in a cartridge main body 2, and a pair of shutter plates 5a and 5b that serve as a shutter mechanism. It is stored. The cartridge body 2 is configured by assembling a pair of an upper shell 6 and a lower shell 7 that are combined with each other.

  The optical disc 3 used in the disc cartridge 1 has a center hole 3a formed at the center thereof for engaging the disc rotation driving mechanism on the recording and / or reproducing apparatus side. The optical disc 3 may be a read-only optical disc in which a pit pattern corresponding to an information signal to be recorded is formed on a disc substrate, or a rewritable optical disc using a phase change material for a recording layer. Further, a write-once optical disc using an organic dye material or the like for the recording layer may be used. Furthermore, the recording medium used may be an optical magnetic disk, a magneto-optical disk, a magnetic disk, or the like. Further, a cleaning disk may be used instead of the recording medium.

  As shown in FIG. 4, the upper shell 6 constituting the cartridge body 2 is formed by injection molding a resin material. The upper shell 6 has a substantially arc-shaped front surface on the insertion end side to the recording and / or reproducing apparatus, out of the substantially rectangular main surface as a whole. In addition, an outer peripheral wall 8 forming a side surface of the cartridge body 2 is erected on the upper shell 6 along the outer peripheral edge portion of the main surface.

  The outer peripheral wall 8 and the inner peripheral wall 11 that is inscribed in the outer peripheral wall 8 are formed with a pickup entry recess 9 that is located in the center portion on the front surface side and into which an optical pickup on the recording and / or reproducing apparatus side is made to enter. Yes. A plurality of bosses 10 formed with screw holes for coupling to the lower shell 7 are formed on the outer peripheral wall 8 in the vicinity of each corner portion, for example.

  The inner peripheral wall 11 functions so as to serve as a guide wall when the rotation wheel 4 is rotatably accommodated inside and the rotation wheel 4 rotates. Further, the main surface portion of the upper shell 6 forms a disc storage portion with the rotation wheel 4 when the rotation wheel 4 is stored.

  A clamping plate 13 that clamps the optical disk 3 together with a disk table that constitutes a disk rotation driving unit on the recording and / or reproducing apparatus side is attached to a substantially central portion of the inner surface of the upper shell 6. The clamping plate 13 is attached by an attachment ring 13a. Specifically, the clamping plate 13 is attached by being sandwiched between the attachment ring 13a and the substantially central portion of the inner surface of the upper shell 6 and fixing the attachment ring 13a to the substantially inner portion of the inner surface of the upper shell 6 by welding or the like. . The optical disk 3 is brought into a rotatable state in the disk storage portion when the disk table is engaged with the center hole 3 a and is further sandwiched between the disk table and the clamping plate 13.

  Note that a rising wall 16a that constitutes a location hole 26a of the lower shell 7 (to be described later) and a rising wall 16b that constitutes an alignment hole 26b are further formed on the inner surface of the upper shell 6.

  The lower shell 7 coupled to the upper shell 6 configured as described above is formed by injection molding of a resin material as in the above-described upper shell 6, as shown in FIGS. Has been. The lower shell 7 has a substantially arcuate shape on the front side that is inserted into the recording and / or reproducing apparatus, out of a substantially rectangular main surface. In the lower shell 7, an outer peripheral wall 21 that forms the side surface of the cartridge body 2 is erected along the outer peripheral edge of the main surface, and an inner peripheral wall 28 is formed so as to be inscribed in the outer peripheral wall 21.

  The lower shell 7 is formed with a first opening 24 that is open so that an optical pickup or a disk table can enter the front central portion of the outer peripheral wall 21. The first opening 24 includes a substantially rectangular optical pickup opening 24a that allows a part of the signal recording surface of the optical disc 3 to face outward from the open end on the front surface side, and the optical pickup. The opening 24a is connected to a rotation driving opening 24b that faces the center hole 3a of the optical disk 3 that is continuous with the opening 24a. That is, the recording / reproducing opening 24a is formed to have a size sufficient to allow the optical pickup of the recording / reproducing apparatus to enter the inside of the cartridge body 2, and the rotation driving opening 24b Alternatively, it is formed in a size sufficient to allow the disk table constituting the disk rotation drive mechanism of the reproducing apparatus to enter the inside of the cartridge body 2. Further, a tapered portion 24c that is inclined in the direction in which the opening end is widened is formed on one opening end side of the optical pickup opening 24b. The tapered portion 24c serves as a portion in which the operated portion 45 is accommodated when the operated portion 45 of the rotation wheel 4 described later is positioned in a state where the shutter plates 5a and 5b open the first opening 24.

  On one side edge of the recording / reproducing opening 24a constituting the first opening 24 and one side edge of the driving opening 24b, a pair of shutter plates 5a, 5b forms the first opening 24. A plurality of protrusions 27 are formed to prevent dust and the like from entering the cartridge body 2 when closed.

  On the back side of the outer peripheral wall 21, a boss 22 is formed in which a through hole is formed to be attached to the boss 10 in which the above-described screw hole on the upper shell 6 side is formed. As shown in FIG. 2, the upper shell 6 and the lower shell 7 are joined by inserting a screw 23 through a through hole of the boss 22 of the lower shell 7 and screwing into a screw hole of the boss 10 of the upper shell 6. The

  Further, on both sides of the front surface of the lower shell 7, an insertion guide pin 100 serving as an insertion guide member on the recording and / or reproducing device side when the disc cartridge 1 is inserted into the recording and / or reproducing device is engaged. Insertion guide grooves 25a and 25b are formed. Specifically, as shown in FIG. 6, the insertion guide grooves 25a and 25b open the bottom surface of the cartridge main body 2 constituted by the front surface and the lower shell 7 serving as the insertion end to the recording and / or reproducing apparatus, It is a groove formed on the bottom surface of the cartridge main body 2 from the front surface of the main body 2 toward the back surface side. Further, the insertion guide grooves 25a and 25b are formed so that the front opening end side is widest, and the insertion guide pins 100 are easy to enter.

  Furthermore, at least the insertion guide groove 25a is formed so that the innermost portion is substantially the same as the thickness of the insertion guide pin 100, and restricts movement in the X direction and the Y direction perpendicular to each other in the mounting surface. The other insertion guide groove 25 b is formed to be slightly wider than the insertion guide pin 100. The insertion guide groove 25b, which is slightly wider than the insertion guide pin 100, regulates the rotational direction in the mounting surface in cooperation with the insertion guide groove 25a when the insertion guide pin 100 hits the innermost part. The insertion guide groove 25b is also formed so that at least the innermost portion thereof is substantially the same as the thickness of the insertion guide pin 100, so that more reliable positioning can be performed at the mounting portion of the recording and / or reproducing apparatus. May be. Such insertion guide grooves 25a and 25b can be positioned and mounted on the mounting portion of the recording and / or reproducing apparatus without using a location hole 26a and an alignment hole 26b described later.

  The insertion guide groove 25a also functions as an identification part for disc cartridges having substantially the same shape with different recording formats. For example, when the disc cartridge 1 is used for business use in a broadcasting station or the like, and a disc cartridge having a recording format etc. different from that of the disc cartridge 1 but having substantially the same outer shape is used for consumer use, the disc for business use The insertion guide groove 25a is provided only in the cartridge 1, and not in the consumer disk cartridge. Thereby, in the recording and / or reproducing device for the business disc cartridge 1, the type of the disc cartridge can be identified by the presence or absence of the insertion guide groove 25a, and when the consumer disc cartridge is mistakenly inserted, The insertion guide pin 100 for the insertion guide groove 25a can prevent erroneous insertion.

  That is, the insertion guide grooves 25a and 25b as described above have an insertion guide function at the time of insertion into a recording and / or reproducing apparatus, and a discriminating function from a disc cartridge having a different recording format while maintaining the same outer shape and size. Furthermore, it is a multifunctional groove having a positioning function or the like at the mounting portion of the recording and / or reproducing apparatus.

  Further, in the vicinity of one corner portion on the back side of the lower shell 7, as shown in FIGS. 2 and 5, a location serving as a reference hole for positioning and mounting the disk cartridge 1 on the recording and / or reproducing apparatus. A hole 26a is formed. An adjustment alignment hole 26b is formed in the vicinity of the other corner.

  As shown in FIG. 1 and FIG. 2, the front surface of the cartridge body 2 constituted by assembling the upper shell 6 and the lower shell 7 on both side surfaces parallel to the direction of insertion into the recording and / or reproducing apparatus Guide grooves 15a and 15b for insertion into the recording and / or reproducing apparatus are formed from the side to the back side.

  When the upper shell 6 and the lower shell 7 are brought together, a storage portion for storing the rotation wheel 4 is formed inside the inner peripheral wall 11. As shown in FIGS. 7 and 8, the rotation wheel 4 housed in the housing portion is formed by injection molding a resin material. The main surface portion of the rotation wheel 4 is substantially dish-shaped, and the upper shell 6 and one of the main surfaces of the shutter plates 5a and 5b constitute a disc storage portion when the concave portion is disposed in the cartridge body 2. . The rotation wheel 4 is formed in a substantially circular shape, and a ring portion 43 is erected on the outer peripheral edge thereof. A second opening 44 having substantially the same size as the first opening 24 provided in the lower shell 7 is formed on the main surface of the rotation wheel 4.

  When the second opening 44 coincides with the first opening 24 of the lower shell 7, the stored optical disk 3 is exposed to the outside. That is, the second opening 44 includes an opening corresponding to the optical pickup opening 24a of the first opening 24 and an opening corresponding to the rotation driving opening 24b.

  Further, as shown in FIG. 7, the base end portion of the ring portion 43 is formed with a tapered portion 42 that is inclined toward the main surface portion side. The taper portion 42 supports the outer peripheral edge of the optical disc 3 by line contact so that the signal recording surface of the optical disc 3 is in surface contact with the main surface portion of the rotation wheel 4 and is not damaged.

  As shown in FIGS. 7 and 8, in the vicinity of the second opening 44 of the rotation wheel 4, a shutter opening pin that protrudes outward and constitutes a shutter opening member of a shutter opening mechanism on the recording and / or reproducing apparatus side. An operated portion 45 with which 41 is engaged is formed. The operated portion 45 is configured by a concave portion that opens the recording and / or reproducing device side by the first operated piece 45a and the second operated piece 45b, and the recording and / or reproducing device side is provided here. The shutter release pin 41 is engaged. As the rotation wheel 4 rotates, the operated portion 45 is exposed to the outside from the front surface of the lower shell 7 in which the first opening 24 is formed, and moves in the width direction of the first opening 24. The operated portion 34 is located in a portion widened by the tapered portion 24c when the shutter plates 5a and 5b open the first opening 24.

  A pair of shutter plates 5 a and 5 b are disposed between the rotation wheel 4 and the lower shell 7. Therefore, on the surface of the rotation wheel 4 where the shutter plates 5a and 5b are disposed, as shown in FIG. 8, there are protrusions 46 for reducing the contact area with the shutter plates 5a and 5b and reducing the sliding resistance. A plurality are formed. The protrusion 46 is formed to protrude by, for example, about 20 μm.

  As shown in FIG. 8, the rotation wheel 4 as described above is configured such that the shutter plates 5 a and 5 b close the first and second openings 24 and 44 by the biasing member 48 configured by a coil spring or the like. It is urged to rotate. One end of the biasing member 48 is locked to a locking piece 48a formed on the ring portion 43 of the rotation wheel 4, and the other end is locked to a locking projection 48b formed on the inner surface of the upper shell 6 shown in FIG. It is locked. The urging member 48 expands and contracts with the rotation of the rotation wheel 4, but the guide groove formed by the rising wall formed on the inner surface of the upper shell 6 and outside the inner peripheral wall 11 and the outer peripheral wall 8. 49 so that the cartridge body 2 will not be exposed during expansion and contraction. Further, as shown in FIGS. 7 and 8, a flange portion 47 that substantially closes the guide groove 49 is also formed on the outer peripheral edge of the rotation wheel 4.

  In the rotation wheel 4 configured as described above, the shutter plates 5a and 5b are urged by the urging member 48 in the direction of closing the first and second openings 24 and 44, and the operated portion 45 is The shutter plates 5a and 5b are rotated in the direction to open the first and second openings 24 and 44 by the shutter opening pin 41 on the recording and / or reproducing apparatus side. At this time, the inner peripheral wall 11 functions as a guide wall when the rotation wheel 4 rotates.

  A pair of shutter plates 5a and 5b constituting a shutter mechanism for opening and closing the first opening 24 formed in the lower shell 7 and the second opening 44 formed in the rotation wheel 4 are as shown in FIG. 5a is larger and 5b is smaller than 5a.

  As shown in FIG. 9, the larger first shutter plate 5 a includes a first shutter portion 51 that closes the first and second openings 24 and 44, an inner surface of the upper shell 6, and an outer peripheral wall. 1 and a second shaft to which a smaller second shutter plate 5b is attached, and a first rotation support portion 53 that is rotatably supported by a first support shaft 52 formed between the inner peripheral wall 11 and the inner peripheral wall 11. Hole 54.

  The first shutter portion 51 includes a first side edge portion 51a that is located on one side edge of the second opening portion 44 of the rotation wheel 4 when the second opening portion 44 is closed, and a first side edge portion 51a. And a second side edge 51b continuous to the second side edge 51b and a third side edge 51c continuous to the second side edge 51b. The second side edge portion 51b is bent inward from the first side edge portion 51a, and the third side edge portion 51c is bent outward with respect to the second side edge portion 51b. Is formed. Further, the fourth side edge portion 51d facing the first to third side edge portions 51a to 51c has bosses 10 and 22 formed at one corner portion of the upper shell 6 and the lower shell 7, and a rotation hole. 26a, a wavy line-shaped escape portion 51e for escaping an erroneous recording preventing member or the like is formed.

  Further, the first shutter portion 51 is formed with a groove portion 51f that engages with the convex portion 27 formed on the peripheral edge portion of the first opening 24 of the lower shell 7 on the surface on the lower shell 7 side. . When the shutter plates 5 a and 5 b close the first and second openings 24 and 44, the groove 51 f is engaged with the protrusion 27 formed on the peripheral edge of the first opening 24. , Dust and the like are prevented from entering the cartridge body 2.

  Further, a guide protrusion 51 g that engages with a guide groove 55 formed on the main surface portion of the rotation wheel 4 is formed on the surface of the first shutter portion 51 on the optical disc 3 side. The guide protrusion 51g engages with the guide groove 55 of the rotation wheel 4 to restrict the rotation of the first shutter plate 5a. Further, the first shutter portion 51 is formed with a restricting projection 51h for restricting the displacement of the shutter plate 5a on the surface on the optical disc 3 side. When the shutter plates 5a and 5b close the first and second openings 24 and 44, the restricting projection 51h is located at a position corresponding to the inner peripheral non-signal recording area around the center hole 3a of the optical disc 3. Even if the first shutter plate 5a is pushed and displaced inward, the signal recording area of the optical disc 3 is not damaged. When the shutter plates 5a and 5b open the first and second openings 24 and 44, the restricting protrusion 51h enters the escape groove 56 formed from the center of the rotation wheel 4 and the shutter plate 5a. So as not to obstruct the rotation.

  The first rotation support portion 53 of the shutter plate 5a is formed with a first shaft hole 53a through which the first support shaft 52 formed in the upper shell 6 is inserted.

  The second shutter plate 5b that engages with the first shutter plate 5a as described above closes the first and second openings 24 and 44 together with the first shutter portion 51, as shown in FIG. And a second rotation support portion 62 attached to a second shaft hole 54 formed in the first shutter plate 5a.

  The second shutter portion 61 is connected to the first side edge portion 61a engaged with the second side edge portion 51b of the first shutter portion 51, and the first shutter portion is continuous with the first side edge portion 61a. A second side edge portion 61b that engages with the third side edge portion 51c of the first side edge portion 51b, and a third side edge portion 61c that is continuous with the first side edge portion 61a on the opposite side of the second side edge portion 61b. And have. When the shutter plates 5 a and 5 b close the first and second openings 24 and 44, the second side edge 51 b of the first shutter part 51 and the first side edge of the second shutter part 61. 61a meshes, and the third side edge 51c of the first shutter portion 51 and the second side edge 61b of the second shutter portion 61 mesh. Therefore, when the pair of shutter plates 5a and 5b closes the first and second openings 24 and 44, the shutter plates 5a and 5b mesh with each other, so that dust and the like enter the inside from the coupling portion. In addition to preventing this, when the shutter plates 5a and 5b are pressed, it is difficult to bend.

  In addition, the second shutter portion 61 is formed with a first cam portion 64 configured by a groove with which a first control protrusion 63 formed on the rotation wheel 4 is engaged. The first cam portion 64 controls the rotation of the second shutter plate 5b when the first control protrusion 63 is engaged. The first cam portion 64 includes a narrow narrow portion 64 a on the outer peripheral side of the rotation wheel 4 and a widened portion 64 b wider than the narrow portion 64 a from the center of the rotation wheel 4. The narrow portion 64a is a first action portion that rotates the second shutter plate 5b in the first half when the second shutter plate 5b opens the first and second openings 24 and 44, and The widened portion 64b is a first portion that does not act in the latter half when the first control projection 63 moves, that is, when the second shutter plate 5b opens the first and second openings 24 and 44. It becomes a non-action part. Therefore, the narrow portion 64a rotates the second shutter plate 5b at the first half when the second shutter plate 5b opens the first and second openings 24 and 44, and the first control protrusion When 63 moves to the widened portion 64b, nothing acts on the second shutter plate 5b. In addition, you may make it form a 1st action part and a 1st non-action part with the groove | channel curved like a 2nd cam part other than forming with the width | variety of a linear groove | channel.

  Further, the second shutter portion 61 is formed with a second control protrusion 66 that engages with a second cam portion 65 formed by a groove formed in the main surface portion of the rotation wheel 4. The second cam portion 65 includes a first curved portion 65a curved in the first direction on the center side of the rotation wheel 4 and a second curved portion 65a on the outer peripheral side of the rotation wheel 4 opposite to the first curved portion 65a. And a second curved portion 65b curved in the direction of. The first curved portion 65a is a second non-acting portion that does not act on the first half portion when the second shutter plate 5b opens the first and second openings 24, 44, The curved portion 65b serves as a second action portion that acts in the latter half portion when the second shutter plate 5b opens the first and second openings 24 and 44. Therefore, the first curved portion 65a does not act on the first half portion when the second shutter plate 5b opens the first and second openings 24 and 44, and the second control projection 66 has the first control projection 66. When the second curved portion 65b is moved, that is, in the latter half of the rotation of the second shutter plate 5b, the second curved portion 65b is replaced with the narrow portion 64a of the first cam portion 64 described above. 2 shutter plate 5b is rotated. As described above, the disc cartridge 1 is configured such that when the second shutter plate 5b opens the first and second openings 24 and 44, the working portion is divided into the first half portion and the second half portion, so that dust or the like is caused by wear. Is to prevent the occurrence of.

  In addition, you may comprise the 1st and 2nd effect | action part mentioned above and the 1st and 2nd non-action part in what combination of a wide part, a narrow part, and a curved part.

  A second support shaft 62a is formed on the second rotation support portion 62, and the second support shaft 62a is a second support shaft 53 formed on the first rotation support portion 53 of the first shutter plate 5a. The second shaft hole 54 is inserted. Therefore, the second shutter plate 5 b does not rotate with respect to the rotation wheel 4 but rotates with respect to the first shutter plate 5.

  Next, the rotation of the rotation wheel 4 and the operation of the pair of shutter plates 5a and 5b will be described with reference to FIGS. FIG. 10 shows a state where the pair of shutter plates 5a and 5b closes the first and second openings 24 and 44. FIG. When the pair of shutter plates 5 a and 5 b close the first and second openings 24 and 44, the rotation wheel 4 is urged to rotate in the direction of arrow A in FIG. 10 by the urging force of the urging member 48. In this state, the operated portion 45 is located at one side edge of the first opening 24. Then, the second side edge portion 51 b of the first shutter portion 51 and the first side edge portion 61 a of the second shutter portion 61 are engaged with each other, and the third side edge portion of the first shutter portion 51 is further engaged. 51c and the second side edge portion 61b of the second shutter portion 61 mesh with each other to prevent dust and the like from entering the inside from the coupling portion, and to prevent bending when the shutter plates 5a and 5b are pressed. ing.

  At this time, the guide protrusion 51 g of the first shutter plate 5 a is positioned at one end of the guide groove 55 of the rotation wheel 4 from the center of the rotation wheel 4. Further, in the first cam portion 64 of the second shutter plate 5b, a first control projection 63 is engaged with a narrow portion 64a serving as a first action portion. Further, the second control projection 66 of the second shutter plate 5b is engaged with the first curved portion 65a of the second cam portion 65 of the rotation wheel 4 serving as a second non-acting portion.

  When the rotation wheel 4 is rotated in the direction of the arrow A in FIG. 10 against the urging force of the urging member 48 at the operated portion 45, the guide protrusion 51 g is engaged with the guide groove 55 of the rotation wheel 4. The combined first shutter plate 5a rotates in the direction of arrow B in FIG. 10 about the first support shaft 52 of the upper shell 6. As the first shutter plate 5a rotates, the second shutter plate 5b moves in the direction of arrow C with respect to the first shutter plate 5a around the second support shaft 62a of the first shutter plate 5a. To turn. At the start of rotation of the second shutter plate 5b, the second shutter plate 5b is rotated by the narrow portion 64a of the first cam portion 64 which is the first action portion engaged with the first control protrusion 63 of the rotation wheel 4. Is done. Note that when the second shutter plate 5b starts to rotate, the first curved portion 65a of the second cam portion 65 of the rotation wheel 4 with which the second control protrusion 66 of the second shutter plate 5b is engaged is as follows. The second non-acting part has no effect.

  Further, when the rotation wheel 4 rotates in the direction of the opposite arrow A, as shown in FIG. 11, the guide protrusion 51 g engaged with the guide groove 55 of the rotation wheel 4 is located on the outer peripheral side of the rotation wheel 4 of the guide groove 55. Move to the end. With the rotation of the first shutter plate 5a, the second shutter plate 5b is shown in FIG. 10 with respect to the first shutter plate 5a around the second support shaft 62a of the first shutter plate 5a. It rotates in the direction of arrow C. Then, the first control protrusion 63 of the rotation wheel 4 moves to the widened portion 64b of the first cam portion 64 serving as the first non-acting portion, and has no effect on the second shutter plate 5b. No longer. Instead, the second control protrusion 66 of the second shutter plate 5b moves from the first bending portion 65a that is the second non-operation portion to the second bending portion 65b that is the second operation portion. Then, the second shutter plate 5b is rotated in the arrow C direction. Accordingly, as shown in FIG. 11, the first and second openings 24 and 44 are opened, and the optical disc 3 accommodated in the rotation wheel 4 can be exposed to the outside over the inner and outer circumferences. .

  By the way, as shown in FIGS. 10 and 11, the shutter plates 5 a and 5 b keep the second openings 24 and 44 closed in the cartridge body 2 by restricting the rotation of the rotation wheel 4. A locking mechanism 71 is provided. Specifically, as shown in FIG. 12, the lock mechanism 71 includes a lock member 72 that locks the rotation wheel 4. The lock member 72 has a base portion 73, and is entirely formed of an elastic material having excellent slidability, for example, polyacetal resin. The base portion 73 is formed with a shaft hole 75 through which a support shaft 74 formed on the inner surface of the lower shell 7 is inserted. Further, the base portion 73 is a first unlocking piece pressed by a locking portion 76 that locks the rotation of the rotation wheel 4 and an insertion guide pin 100 that also functions as an unlocking pin on the recording and / or reproducing device side. 77, a second unlocking piece 78 pressed by the cartridge holding piece 101 on the recording and / or reproducing apparatus side, and a locking piece 79 on which one end of the urging member is locked. The lock member 72 is disposed in the vicinity of the insertion guide groove 25 b on the alignment hole 26 b side formed on the back side of the lower shell 7. The lock member 72 is attached to the lower shell 7 by inserting the shaft hole 75 through the support shaft 74 of the lower shell 7.

  As shown in FIG. 12, the lock member 72 is rotatably attached by inserting the support shaft 74 of the lower shell 7 through the shaft hole 75. At this time, the lock portion 76 faces the inner side, that is, the outer peripheral portion of the rotation wheel 4, and the first lock release piece 77 is formed in the insertion guide groove 25 b in a relief formed on the rising wall constituting the insertion guide groove 25 b. The second unlocking piece 78 is exposed from the hole 80 and is exposed to the outside from the notch 81 formed in the guide groove 15 b of the cartridge body 2.

  In the vicinity of the support shaft 74 to which the lock member 72 is attached, an attachment pin 83 to which an urging member 82 such as a torsion coil spring that urges the lock member 72 in one direction is further formed. The biasing member 82 includes a first arm portion 82b and a second arm portion 82c formed on both sides of the coil portion 82a. The first and second arm portions 82b and 82c are bent at approximately 90 degrees so that the tip portions are opposite to each other, thereby forming a first locking portion 82d and a second locking portion 82e. . Such a biasing member 82 biases the first arm portion 82b and the second arm portion 82c in the opening direction away from each other. The coil portion 82a of the urging member 82 is wound around the mounting pin 83. The biasing member 82 attached to the attachment pin 83 has the first locking portion 82d of one first arm portion 82b locked to the locking piece 79 of the locking member 72, and the other second arm portion. When the second locking portion 82e of 82c is locked in the vicinity of the boss 22 of the lower shell 7, the locking member 72 is positioned on the opening end side of the insertion guide groove 25b. The second unlocking piece 78 is biased in the direction of the arrow D in FIG. 10 in the locked state so as to face the notch 81 of the guide groove 15b. The locking piece 79 is a thin portion 79 a so that the first arm portion 82 b of the urging member 82 extends between the locking piece 79 and the inner surface of the lower shell 7.

  The lock portion 76 of the base body portion 73 is located slightly inward from the outer peripheral portion of the rotation wheel 4. In the rotation wheel 4, a lock groove 84 that engages with a lock portion 76 that protrudes from the base portion 73 is formed slightly inside the outer peripheral portion. An engagement recess 85 is formed in the lock groove 84 on the inner side. The lock portion 76 locks the rotation of the rotation wheel 4 by engaging with the engagement recess 85. As shown in FIG. 13, the lock groove 84 is a surface of the rotation wheel 4 on the side where the optical disk 3 is accommodated, and is a taper that supports the outer peripheral edge of the optical disk 3 formed at the base end portion of the ring portion 43. It is formed on the lower side of the portion 42 so as not to unnecessarily provide a thick portion.

  Here, the assembly procedure of the lock mechanism 71 as described above will be described. First, the coil portion 82a of the urging member 82 is wound around the mounting pin 83 of the lower shell 7. Here, the urging member 82 urges the first arm portion 82b and the second arm portion 82c in the opening direction away from each other. For this reason, when the coil portion 82a is wound around the mounting pin 83, one of the first arm portions 82b is located on the outer peripheral wall 21 in the vicinity of the first opening 24 of the lower shell 7 as shown by a dotted line in FIG. The other second arm portion 82 c is abutted against the outer peripheral wall 21 in the vicinity of the boss 22. Thereafter, the first arm portion 82b of the biasing member 82 that is locked to the locking piece 79 of the lock member 72 is rotated in the direction of the second arm portion 82c against the biasing force. Is retained. Next, the support shaft 74 of the lower shell 7 is inserted into the shaft hole 75 of the lock member 72. When the lock member 72 is attached to the support shaft 77, as shown in FIG. 15, the first arm portion 82b that is rotated in the direction of the second arm portion 82c against the urging force is locked. It is locked to the locking piece 79 of the member 72.

The first arm portion 82 b of the urging member 82 that is locked to the locking piece 79 of the lock member 72 is rotated in the direction of the second arm portion 82 c against the urging force, and the engagement of the lock member 72. In the operation of enabling the locking to the stop piece 79, as shown in FIG. 16, a cylindrical operation member 91 inserted into the first locking portion 82d of the first arm portion 82b is used. As shown in FIGS. 14 and 16, a projection 92 for collecting the first locking portion 84 d is formed in the vicinity of the first opening 24 of the outer peripheral wall 21 of the lower shell 7. . The protrusion 92 is formed at a position where it intersects with the rotation locus 93 of the first locking portion 84d. Accordingly, the first arm portion 84 b is urged to rotate in a direction approaching the outer peripheral wall 21 in the vicinity of the first opening 24, but a gap 94 is formed between the first arm portion 84 b and the outer peripheral wall 21. As a result, the cylindrical operation member 91 easily captures the first locking portion 84d that is urged to rotate in the direction approaching the outer peripheral wall 21 in the vicinity of the first opening 24. Can be collected.

  That is, as shown in FIG. 17, when the protrusion 92 is not formed, it is in contact with the outer peripheral wall 21 of the first locking portion 84 c in a state of being urged by rotation, and is Since the engaging portion 84c cannot be engaged and collected, the productivity cannot be improved. However, when the protruding portion 92 is provided as shown in FIG. The first locking portion 84c can be easily collected by the operation member 91, and the productivity can be improved.

  With reference to FIG. 10, the lock mechanism 71 in a state where the shutter plates 5 a and 5 b close the first and second openings 24 and 44 will be described. The lock member 72 is centered on the support shaft 74. The urging force of the urging member 82 is urged in the direction of arrow D in FIG. At this time, the lock portion 76 is engaged with the engagement recess 85 of the lock groove 84 of the rotation wheel 4 formed inside. Therefore, the rotation of the rotation wheel 4 is prohibited when the lock 76 is engaged with the engagement recess 85. The first unlocking piece 77 faces the front opening end side in the insertion guide groove 25b from the escape hole 80, and the insertion guide pin 100 serving as the unlocking pin on the recording and / or reproducing apparatus side can be pressed. It has become.

  When the disc cartridge 1 is inserted into the recording and / or reproducing apparatus, the insertion guide pin 100 that serves as an unlocking pin of the recording and / or reproducing apparatus enters the insertion guide groove 25b. When the insertion guide pin 100 enters the insertion guide groove 25b from the front opening end, first, the insertion guide pin 100 presses the first unlocking piece 77. Then, as shown in FIG. 10, the lock member 72 rotates about the support shaft 74 in the counter arrow D direction in FIG. 10 against the urging force of the urging member 82. Accordingly, the lock portion 76 is released from the engagement state in the engagement recess 85 in the lock groove 84, and the lock portion 76 moves in the lock groove 84 according to the rotation of the rotation wheel 4.

  By the way, as shown in FIGS. 1, 18 and 19, the cartridge main body 2 formed by abutting and joining the upper shell 6 and the lower shell 7 is formed on both side surfaces which become the insertion direction into the recording and / or reproducing apparatus. Concave guide grooves 15a and 15b are formed. The insertion guide grooves 15a and 15b formed on both side surfaces of the cartridge main body 2 have loading recesses 96a and 96d on the front side for engaging the cartridge holding pieces 101 for holding the disk cartridge 1 on the recording and / or reproducing apparatus side. 96b is formed continuously in the depth direction of the guide grooves 15a and 15b. As shown in FIG. 19, the loading concave portions 96a and 96b are formed wider than the guide grooves 15a and 15b, and are formed so that the cartridge holding piece 101 of the recording and / or reproducing apparatus is securely engaged. Yes. As shown in FIG. 18, the loading concave portions 96a and 96b are arranged on the vertical surface so that the cartridge holding piece 101 of the recording and / or reproducing apparatus can be reliably pulled into the mounting portion. The bottom surfaces are formed by arcuate surfaces 97b and 97b that are deepest on the vertical surfaces 97a and 97a side.

  As shown in FIG. 20, in the loading recess 96b on the side where the lock mechanism 71 is provided, a storage recess 99 continuous in the depth direction is formed on an arcuate surface 97b constituting the bottom surface. The storage recess 99 is a portion where the second unlocking piece 78 of the lock member 72 constituting the lock mechanism 71 described above faces, and is formed as a through hole by the above-described notch 81. Further, as shown in FIG. 21, engagement grooves 98 and 98 are formed on opposing inner surfaces of the cartridge body 2 so as to be continuous with the storage recess 99. The engaging grooves 98, 98 are formed in a concave shape in accordance with the turning locus of the second unlocking piece 78, and each end of the second unlocking piece 78 is engaged to eliminate the gap. Thus, foreign matter such as dust is prevented from entering through the through hole of the housing recess 99. When the lock member 72 is rotated, both end portions of the second lock release piece 78 move in the engagement grooves 98 and 98. The engagement grooves 98 and 98 may be formed only on the inner surface of one of the upper and lower shells 6 and 7.

  When the shutter plates 5a and 5b close the first and second openings 24 and 44, the second unlocking piece 78 has the urging member 82 attached to the lock member 72 around the support shaft 74. Since it is urged in the direction of arrow D in FIG. 10 by the force, it is in a state of being close to the vertical surface 97a of the loading recess 96b as shown in FIG.

  When the recording and / or reproducing apparatus is loaded, as shown in FIG. 22, the second unlocking piece 78 is such that the cartridge holding piece 101 on the recording and / or reproducing apparatus side enters the loading recess 96b. Accordingly, the second unlocking piece 78 is housed in the housing recess 99 formed on the bottom surface of the loading recess 96b. It will be. At this time, the second unlocking piece 78 completely enters the storage recess 99 and does not protrude from the arcuate surface 97b which is the bottom surface of the loading recess 96b. Accordingly, the cartridge holding piece 101 of the recording and / or reproducing apparatus can be enlarged, and the loading of the disc cartridge 1 can be performed reliably.

  As shown in FIG. 23, when the lock is released by the first lock release piece 77, the state is slightly protruded from the storage recess 99.

  Before the disc cartridge 1 having the above-described configuration is mounted in the recording and / or reproducing apparatus, the disc cartridge 1 is in a state as shown in FIGS. That is, when the pair of shutter plates 5a and 5b closes the first and second openings 24 and 44, the rotation wheel 4 is rotated in the direction of arrow A in FIG. 10 by the urging force of the urging member 48. In a biased state, the operated portion 45 is located at one side edge of the first opening 24. Then, the second side edge portion 51 b of the first shutter portion 51 and the first side edge portion 61 a of the second shutter portion 61 are engaged with each other, and the third side edge portion of the first shutter portion 51 is further engaged. 51c and the second side edge portion 61b of the second shutter portion 61 are engaged with each other. That is, in the disk cartridge 1, the shutter plates 5a and 5b are engaged with each other so that the shutter plate 5a is not easily bent and deformed, and the shutter plate 5a is prevented from being lifted so that foreign matter such as dust does not enter the cartridge body 2. I have to.

  At this time, the guide protrusion 51 g of the first shutter plate 5 a is positioned at one end of the guide groove 55 of the rotation wheel 4 from the center of the rotation wheel 4. Further, the first control projection 63 is engaged with the narrow portion 64a which is the first action portion of the first cam portion 64 of the second shutter plate 5b. Further, the second control projection 66 of the second shutter plate 5b is engaged with the first curved portion 65a of the second cam portion 65 of the rotation wheel 4 which is the second non-operation portion. Thus, the disk cartridge 1 is in a state in which the first opening 24 of the lower shell 7 is closed as shown in FIG. Even when the first shutter plate 5a is pressed, the restricting projection 51h of the first shutter plate 5a hits the inner peripheral non-signal recording area of the optical disc 3, and the first shutter portion. Since 51 does not come into contact with the signal recording area of the optical disc 3, it is possible to prevent the signal recording area from being damaged.

  Further, when the shutter plates 5 a and 5 b close the first and second openings 24 and 44, the groove 51 f of the first shutter 51 is formed at the peripheral edge of the first opening 24. The protrusion 27 is engaged to prevent dust and the like from entering the cartridge body 2.

  Further, the lock mechanism 71 will be described. As shown in FIG. 10, the lock member 72 is urged in the direction of arrow D in FIG. 10 by the urging force of the urging member 82 around the support shaft 74. At this time, the lock portion 76 is engaged with the engagement recess 85 of the lock groove 84 of the rotation wheel 4 formed inside. Therefore, the rotation of the rotation wheel 4 is prohibited when the lock 76 is engaged with the engagement recess 85. The first unlocking piece 77 faces the front opening end side in the insertion guide groove 25b from the escape hole 80, and the insertion guide pin 100 serving as the unlocking pin on the recording and / or reproducing apparatus side can be pressed. The second unlocking piece 78 is in a state of approaching the vertical surface 97a of the loading recess 96b.

  Next, a series of operations when the disc cartridge 1 configured as described above is loaded into the recording and / or reproducing apparatus will be described. The disk cartridge 1 is compatible with a standard size disk cartridge as disclosed in Patent Document 1 as described above, and recording and / or reproduction of a standard size disk cartridge is possible. A possible recording and / or reproducing device and disc cartridge 1 can be loaded into a dedicated recording and / or reproducing device. First, the operation when a standard size disk cartridge is loaded in a recording and / or reproducing apparatus capable of recording and / or reproducing will be described.

  When the disc cartridge 1 is inserted into a recording and / or reproducing apparatus capable of recording and / or reproducing a standard size disc cartridge, the disc cartridge 1 is formed in a substantially arc shape with respect to the recording and / or reproducing apparatus. The inserted front surface is inserted as an insertion end. When inserted into a recording and / or reproducing apparatus corresponding to this standard size disk cartridge, first, as shown in FIG. 24, a pair of insertions formed in the mounting portion of the recording and / or reproducing apparatus. A guide pin 100 is inserted. Here, as shown in FIG. 6, the insertion guide grooves 25a and 25b are formed to have the widest width at the front opening end side, so that the disc cartridge 1 can be reliably guided to a predetermined position of the mounting portion. Then, immediately before being attached to the attachment portion, the insertion guide pins 100 and 100 on the recording and / or reproducing apparatus side are positioned on the attachment portion by engaging with the insertion guide grooves 25a and 25b. Specifically, an insertion guide pin 100 having a thickness substantially the same as the width of the insertion guide groove 25a is abutted and engaged with the insertion guide groove 25a in the innermost portion, so that X orthogonal to each other in the mounting surface is obtained. Positioning in the direction and the Y direction. Further, even if the insertion guide pin 100 narrower than the width of the insertion guide groove 25b is abutted and engaged with the insertion guide groove 25b, at least the insertion guide pin 100 engaged with the insertion guide groove 25a is engaged with the insertion guide groove 25b. Together, positioning in the rotational direction within the mounting surface is performed. As described above, when the disc cartridge 1 is mounted on the mounting portion of the recording and / or reproducing apparatus, the insertion guide pins 100 and 100 are engaged with the insertion guide grooves 25a and 25b, so that the mounting surface of the disk cartridge 1 is more reliable. Positioning is done.

  In this recording and / or reproducing apparatus, the location hole 26a and the alignment hole 26b provided on the bottom surface of the cartridge body 2 of the disk cartridge 1 are not used. Further, in the recording and / or reproducing apparatus, when the disc cartridge 1 is mounted on the mounting portion, the insertion guide groove 25a is detected by a detection portion such as a detection switch (not shown), whereby the disc cartridge 1 having a matching recording format is obtained. It can be determined that it is attached.

  When the disc cartridge 1 is mounted in the mounting portion, the insertion guide pin 100 that has entered the insertion guide groove 25 b from the front opening end functions as a lock release pin and presses the first lock release piece 77. Then, as shown in FIG. 10, the lock member 72 rotates about the support shaft 74 in the counter arrow D direction in FIG. 10 against the urging force of the urging member 82. Accordingly, the lock portion 76 is released from the engagement state in the engagement recess 85 in the lock groove 84, and the rotation wheel 4 becomes rotatable.

  When the disc cartridge 1 is inserted into the dedicated recording and / or reproducing apparatus with the front surface formed in a substantially arc shape as the insertion end, it is inserted into the insertion guide grooves 25a and 25b on the front surface as shown in FIG. The guide pin 100 is not inserted and is not positioned at the mounting portion by the insertion guide grooves 25a and 25b, but the positioning pin 102 is engaged with the location hole 26a and the alignment hole 26b provided on the bottom surface of the cartridge body 2. As a result, it is attached to the attachment portion. Then, when the cartridge holding piece 101 on the recording and / or reproducing apparatus side enters the loading recess 96b, the second unlocking piece 78 is pressed, and the lock member 72 has a support shaft 74 as shown in FIG. Rotating in the counter arrow D direction in FIG. 10 against the urging force of the urging member 82 around the center, the lock is released.

  Regardless of which recording and / or reproducing apparatus is loaded, when the lock mechanism 71 is unlocked, the rotation wheel 4 then moves the shutter on the recording and / or reproducing apparatus side to the operated portion 45. The release pin 41 is engaged, and the shutter release pin 41 is rotated in the direction of the arrow A in FIG. 10 against the urging force of the urging member 48. Then, the first shutter plate 5a having the guide projection 51g engaged with the guide groove 55 of the rotation wheel 4 rotates about the first support shaft 52 of the upper shell 6 in the direction of arrow B in FIG. To do. With the rotation of the first shutter plate 5a, the second shutter plate 5b is shown in FIG. 10 with respect to the first shutter plate 5a around the second support shaft 62a of the first shutter plate 5a. It rotates in the direction of arrow C. At the start of rotation of the second shutter plate 5b, the second shutter plate 5b is rotated by the narrow portion 64a of the first cam portion 64 which is the first action portion engaged with the first control protrusion 63 of the rotation wheel 4. Is done. Note that when the second shutter plate 5b starts to rotate, the first curved portion 65a of the second cam portion 65 of the rotation wheel 4 with which the second control protrusion 66 of the second shutter plate 5b is engaged is as follows. The second non-acting part has no effect.

  Furthermore, when the rotation wheel 4 rotates in the direction of the opposite arrow A in FIG. 10, the guide protrusion 51 g engaged with the guide groove 55 of the rotation wheel 4 moves to the outer periphery of the rotation wheel 4 in the guide groove 55 as shown in FIG. 11. Move to the other end. With the rotation of the first shutter plate 5a, the second shutter plate 5b is shown in FIG. 11 with respect to the first shutter plate 5a around the second support shaft 62a of the first shutter plate 5a. It rotates in the direction of arrow B. Then, the first control protrusion 63 of the rotation wheel 4 is a first cam portion that is a first non-acting portion from a narrowing portion 64a of the first cam portion 64 that is a first acting portion. 64 moves to the widened portion 64b and does not act on the second shutter plate 5b. Instead, the second control protrusion 66 of the second shutter plate 5b is changed from the first bending portion 65a serving as the second non-operation portion to the second bending portion serving as the second operation portion. It moves to the part 65b and rotates the second shutter plate 5b in the direction of arrow C in FIG. As a result, the operated portion 45 is positioned in a portion widened by the tapered portion 24c of the first opening 34, and the first and second openings 24 and 44 are opened as shown in FIG. The optical disk 3 accommodated in the rotation wheel 4 can be exposed to the outside over the inner and outer circumferences.

  When the first and second openings 22 and 44 are opened, the optical disk 3 rotatably accommodated in the rotation wheel 4 is centered on the disk table of the disk rotation driving mechanism on the recording and / or reproducing apparatus side. The hole 3a engages and is clamped between the clamping plate 13 provided in the upper shell 6 and the disk table, and is rotatable by the disk table.

  When an information signal is recorded on the optical disc 3 and an information signal recorded on the optical disc 3 is reproduced, the optical disc 3 is rotated by a disc table at CLV (constant linear velocity), CAV (constant angular velocity) or a combination thereof. The At the same time, the optical pickup that has entered the first and second openings 24 and 44 collects a light beam having a wavelength of about 400 nm emitted from the semiconductor laser in the signal recording area of the optical disc 3 by the objective lens, By irradiating the signal recording surface of the optical disc 3 and detecting the return light beam reflected by the signal recording surface, the information signal is recorded on the optical disc 3 or the information signal recorded on the optical disc 3 is read out. Do.

  When the disk cartridge 1 is ejected from the recording and / or reproducing apparatus, the rotation wheel 4 is rotated in the direction of arrow A in FIG. 11 by the urging force of the urging member 48, and the state shown in FIG. Return to state. Then, the lock portion 76 of the lock member 72 moves in the lock groove 84, engages with the engagement recess 85, and returns to the state where the first and second openings 24 and 44 are closed.

  According to the disk cartridge 1 as described above, as shown in FIG. 24, when recording and / or reproduction is performed by a recording and / or reproducing apparatus capable of recording and / or reproducing a standard size disk cartridge. By engaging the insertion guide pins 100 and 100 with the insertion guide grooves 25a and 25b, positioning at the mounting portion of the recording and / or reproducing apparatus and unlocking of the shutter can be performed. Thus, by performing positioning and unlocking using the insertion guide grooves 25a and 25b, the cartridge main body 2 can be used in a recording and / or reproducing apparatus capable of recording and / or reproducing a standard-sized disc cartridge. Therefore, it is not necessary to provide the positioning pin 102 to be engaged with the location hole 26a and the alignment hole 26b provided on the bottom surface, and the configuration of the recording and / or reproducing apparatus can be simplified.

  Further, as shown in FIG. 25, when recording and / or reproducing is performed with a dedicated recording and / or reproducing apparatus for the disk cartridge 1, positioning and unlocking are not performed using the insertion guide grooves 25a and 25b. More accurate positioning can be performed by engaging the positioning holes 102a and the alignment holes 26b provided on the bottom surface of the cartridge body 2 with each other. Further, the unlocking can be performed by a step of engaging the loading recess 96b necessary for loading the disc cartridge 1 with the cartridge holding piece 101 on the recording and / or reproducing apparatus side, and the configuration of the recording and / or reproducing apparatus. Can be prevented from becoming complicated.

  In other words, in the disc cartridge 1, the shutter can be unlocked by the first unlocking piece 77 and the second unlocking piece 78, thereby increasing the degree of freedom in designing the recording and / or reproducing apparatus. Can do.

Further, in this disk cartridge 1, as shown in FIGS. 14 and 16, since the protrusion 92 is provided when the lock mechanism 71 is assembled, the outer peripheral wall 21 and the first arm portion are formed by the protrusion 92. A gap 94 is formed between the first locking portion 84d of 84b and the cylindrical operation member 91 is rotated in a direction approaching the outer peripheral wall 21 in the vicinity of the first opening 24. The biased first locking portion 84d can be easily collected, and the production efficiency can be improved.

  As described above, the small disk cartridge 1 to which the present invention is applied has been described as an example. However, the present invention is not limited to this, and for example, a standard size disk cartridge as disclosed in Patent Document 1 is used. It can also be applied to.

It is the perspective view which looked at the disc cartridge to which the present invention is applied from the upper shell side. It is the perspective view which looked at the said disk cartridge from the lower shell side. It is a disassembled perspective view of the cartridge. FIG. 3 is a plan view seen from an inner surface side of an upper shell constituting the disk cartridge. It is the top view seen from the inner surface side of the lower shell which comprises the said cartridge. It is a principal part top view which shows the relationship between an insertion guide groove and an insertion guide pin. It is the perspective view which looked at the rotation wheel from the surface side in which an optical disk is accommodated. It is the perspective view which looked at the rotation wheel from the surface of the lower shell side. It is a perspective view which shows a shutter plate and a rotation wheel. It is a top view which shows the state which obstruct | occluded the opening part with the shutter board | plate in the state except the lower shell and the optical disk. It is a top view which shows the state which opened the opening part of the shutter board | plate in the state which removed the lower shell and the optical disk. It is a disassembled perspective view of a locking mechanism. It is principal part sectional drawing of the rotation wheel which shows the relationship between the taper part of a rotation wheel, and a lock groove. It is a principal part top view of the lower shell which shows the attachment state of the urging member of a lock mechanism. It is a principal part top view of the lower shell which shows the state to which the lock member and the biasing member were attached. It is a principal part perspective view of the lower shell which shows the state which collects the 1st latching | locking part of the 1st arm part of a biasing member. It is a principal part perspective view of the lower shell used as the comparative example by which the protrusion part for repair of the 1st latching | locking part of the 1st arm part of a biasing member is not provided in the outer peripheral wall of the lower shell. It is a partially cutaway bottom view of the cartridge body. It is a side view of a cartridge main body. FIG. 6 is a bottom view of the main part of the cartridge body in the vicinity of the loading recess, showing the shutter locked state. FIG. 6 is a side view of the main part of the cartridge main body in the vicinity of the loading recess. It is a principal part bottom view of the cartridge main body of the vicinity of the recessed part for loading, and shows the state by which the 2nd lock release piece was operated and the lock | rock was cancelled | released. It is a principal part bottom view of the cartridge main body of the vicinity of the recessed part for loading, and shows the state by which the 1st lock release piece was operated and the lock | rock was cancelled | released. FIG. 3 is a plan view showing a state in which the disk cartridge of a standard size is positioned and mounted on a recording and / or reproducing apparatus capable of recording and / or reproducing. FIG. 3 is a plan view showing a state in which the disk cartridge to which the present invention is applied is positioned and mounted on a dedicated recording and / or reproducing apparatus. It is a perspective view of a disc cartridge showing a state where a first opening is opened.

Explanation of symbols

1 disc cartridge, 2 cartridge main body, 3 optical disc, 4 rotation wheel, 5a, 5b shutter plate, 6 upper shell, 7 lower shell, 25a, 25b insertion guide groove, 26a location hole, 26b alignment hole, 45 operated portion, 71 Lock mechanism, 72 Lock member, 73 Base portion, 74 Support shaft, 75 Shaft hole, 76 Lock portion, 77 First lock release piece, 78 Second lock release piece, 79 Lock piece, 82 Biasing member, 82a Coil portion, 82b first arm portion, 82c second arm portion, 82d first locking portion, 82e second locking portion, 83 mounting pin, 84 lock groove, 85 engagement recess, 91 operation member, 92 Protruding part, 93 Rotating locus, 94 Gap, 96a, 96b Loading recess, 98 Engaging groove, 99 Paid recess 100 inserts a guide pin, 101 cartridge holding piece 102 positioning pin

Claims (1)

A cartridge body in which a first opening for recording and / or reproduction is formed;
A rotation wheel in which a second opening corresponding to the first opening is formed, the second opening corresponding to the first opening for accommodating the disk in a rotatable manner in the cartridge main body and accommodating the disk;
The first opening is located between the bottom surface of the cartridge body and the rotation wheel, and the first opening and the second opening coincide with each other in conjunction with the rotation of the rotation wheel. A shutter mechanism for opening the portion and the second opening,
The shaft is rotatably attached to the inner side of the cartridge body, and is engaged with an engagement recess formed on the outer peripheral side of the rotation wheel, so that the rotation wheel is moved, and the shutter mechanism is formed with the first opening. A lock member having a lock portion that locks at the closed position, and a lock release portion that releases the state in which the lock portion is engaged with the engagement recess;
An urging member that urges the lock member rotatably attached to the cartridge body at the shaft portion in a direction in which the lock portion engages with an engagement recess of the rotation wheel;
The biasing member has a coil portion wound around a mounting pin formed on the inner surface of the cartridge body, and a first arm portion and a second arm portion formed on both sides of the coil portion, The first arm portion and the second arm portion are urged in an opening direction to be separated from each other, and an end portion of the first arm portion is locked to the lock member, and the second arm By urging the end of the cartridge body to the rising wall of the cartridge body, the lock member is urged in a direction in which the lock portion engages with the engagement recess of the rotation wheel,
Before the lock member is attached to the inside of the cartridge body, when the coil portion is wound around the attachment pin, the end of the second arm is abutted against the rising wall of the cartridge body,
Another in position, the first disk cartridge projection portion forming the gap that is formed between the end portion of the arm portion which the end of the first arm portion of the rising wall of the cartridge body collides .

Images