JP4631469B2 - Disc cartridge - Google Patents

Description

  The present invention relates to a disc cartridge provided with a groove having a guide function for insertion into a recording and / or reproducing apparatus.

  There is a disk cartridge as described in Patent Document 1 below. The disc cartridge disclosed in Patent Document 1 is inserted into a recording and / or reproducing apparatus with a substantially arc-shaped front surface of the cartridge body as an insertion end to the recording and / or reproducing apparatus, and is inserted into a positioning hole provided on the bottom surface of the cartridge body. When the positioning pin on the recording and / or reproducing apparatus side is engaged, it is mounted in a state of being positioned on the mounting portion.

  In this disk cartridge, it is not moved to the mounting part due to rattling or the like after being inserted into the recording and / or reproducing apparatus and mounted in the mounting part, and the positioning pin is not mounted in the positioning hole of the disk cartridge. In some cases, it is necessary to move the disk cartridge while guiding the disk cartridge more accurately.

  There may be provided a further disk cartridge in which the outer shape of the disk cartridge is substantially the same and the recording format of the disk is different. For example, consumer disc cartridges and commercial disc cartridges used in broadcasting stations or the like may be provided with different recording formats while having substantially the same outer shape. In this case, there is a possibility that the user erroneously inserts the recording and / or reproducing apparatus different from the regular recording and / or reproducing apparatus. If it is erroneously inserted into a wrong recording and / or reproducing apparatus, there is a possibility that data already recorded on the disc may be erroneously erased.

  In addition, there may be provided a disc cartridge having a small outer shape while maintaining the same recording format. In a recording and / or reproducing apparatus capable of recording and reproducing two types of disc cartridges having different sizes, the positions of the positioning holes of the two types of disc cartridges with respect to the mounting portion are different. Therefore, it is necessary to provide positioning pins at positions corresponding to the positioning holes of the respective disk cartridges in the mounting portion of the recording and / or reproducing apparatus. However, the positioning pin of each disk cartridge provided in the mounting portion does not require a positioning pin corresponding to the other disk cartridge when one disk cartridge is mounted, and also obstructs the mounting of one disk cartridge. End up. For example, if a positioning pin used for a small disk cartridge protrudes from the mounting portion when a large disk cartridge is mounted, the mounting of the large disk cartridge is hindered. For this reason, it is necessary to provide the recording and / or reproducing apparatus with a mechanism for projecting and retracting the positioning pin for each disk cartridge. However, providing such a mechanism complicates the configuration of the recording and / or reproducing apparatus. End up.

JP-A-2003-109343

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a disc cartridge that can be moved while being more accurately guided to a mounting portion to a recording and / or reproducing apparatus. There is.

  It is another object of the present invention to provide a disc cartridge that can identify the type in a recording and / or reproducing apparatus and prevent erroneous insertion into the recording and / or reproducing apparatus.

  It is a further object of the present invention to provide a disc cartridge that can be positioned at a plurality of locations in a mounting portion of a recording and / or reproducing apparatus.

  It is a further object of the present invention to provide a disc cartridge that can simplify the configuration of a recording and / or reproducing apparatus in which a plurality of disc cartridges of different sizes can be mounted.

The disc cartridge according to the present invention includes a cartridge main body having a first opening for recording and / or reproduction formed on the bottom surface, and the first opening for storing the disc and facing the stored disc to the outside. Is formed in the cartridge main body and is rotatably accommodated in the cartridge main body so as to face the front surface of the cartridge main body serving as an insertion end to the recording and / or reproducing apparatus. An operated portion is formed which is a concave portion with which the shutter opening portion on the apparatus side is engaged, and a rotation wheel rotated by the shutter opening portion engaged with the operated portion and a first opening portion of the cartridge body are formed. A pair of first and second shutters that are located between the bottom surface and the rotation wheel and rotate in conjunction with the rotation of the rotation wheel. A shutter having a plate and opening the first opening and the second opening when the first opening and the second opening coincide with the rotation of the rotation wheel A mechanism, a shaft that is rotatably attached to the cartridge body, and an engagement recess in a surface of the rotation wheel that faces the bottom surface of the cartridge body. And a lock member having a lock portion that locks at a position where the first opening is closed, and a lock release piece that releases the state in which the lock portion is engaged with the engagement recess.

A tapered portion is formed on the front surface side of the first opening on the bottom surface of the cartridge body to accommodate the operated portion when the shutter mechanism opens the first opening. The first shutter plate is rotatably attached to the cartridge body, and is rotated with the rotation of the rotation wheel, and the second shutter plate is rotatable with respect to the first shutter plate. It is attached and rotates with the rotation of the first shutter plate.

  On both sides of the bottom surface of the cartridge body, a front surface serving as an insertion end to the recording and / or reproducing apparatus and a bottom surface of the cartridge body are opened, and a groove portion is formed from the front surface of the cartridge body toward the back surface. One of the groove portions is formed to have a width substantially the same as the thickness of the insertion guide pin on the recording and / or reproducing apparatus side, at least the innermost portion engaging with the one groove portion, and the other groove portion is formed on the other side. It is formed wider than the thickness of the insertion guide pin on the recording and / or reproducing apparatus side that engages with the groove.

  On the bottom surface of the cartridge body, a location hole is formed in the extending direction of one groove, an alignment hole is formed in the extending direction of the other groove, and the unlocking piece of the lock member faces the other of the groove. Is done.

  The lock member rotates when the lock release piece is pressed by the insertion guide pin that enters the other of the groove portions, and releases the state in which the lock portion is engaged with the engagement recess.

According to the present invention, the recording and / or open the bottom of the front and the cartridge body as the insertion end to the reproduction apparatus, the groove towards the front of the cartridge bodies in the back side is formed, the recording and / or reproducing apparatus Since the insertion guide pin on the recording and / or playback device side engages with the groove portion before being inserted into the attachment portion and attached to the attachment portion, the attachment portion can be more accurately attached .

  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 disc cartridge of Patent Document 1 uses an optical disc having a diameter of approximately 12 cm as a recording medium, whereas the disc cartridge to which the present invention is applied uses an optical disc having a smaller diameter than the optical disc of a standard size disc cartridge as the 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 disk 3 may be a reproduction-only optical disk in which a pit pattern corresponding to an information signal to be recorded is formed on a disk substrate, or a rewritable optical disk 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. Further, the recording medium used may be a magneto-optical disk, a magnetic disk or the like in addition to the optical disk. 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 among the substantially rectangular main surface. 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 is formed with a first pickup entry recess 9 for entering the recording and / or reproducing device side optical pickup, which is located at the center on the front side. 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.

  Further, as shown in FIG. 5, a substantially annular inner peripheral wall 11 that rotatably accommodates the rotation wheel 4 is formed on the inner peripheral side of the outer peripheral wall 8 so as to be inscribed in the outer peripheral wall 8. The inner peripheral wall 11 is formed with a second pickup entry recess 12 for entering an optical pickup on the recording and / or reproducing apparatus side, which is located at the center on the front side. The inner peripheral wall 11 functions 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. In addition, a lifter 14 for lifting the rotation wheel 4 is formed at the inner base end portion of the inner peripheral wall 11 and in the vicinity of the second pickup entering recess 12. The lifter 14 lifts the rotation wheel 4 toward the lower shell 7 when the shutter plates 5 a and 5 b close the first opening 24.

  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 the 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.

  Further, 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. 7, 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 that serve as insertion ends into 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 accurately mounted on the mounting portion of the recording and / or reproducing apparatus without positioning using a location hole 26a and an alignment hole 26b described later.

  As will be described later, one of the insertion guide grooves 25b is provided with a lock mechanism 71, and an unlocking piece 77 of the lock member 72 constituting the lock mechanism 71 is faced to be engaged with the insertion guide groove 25b. The pin 100 functions as a lock release pin that presses the lock release piece 77.

  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, a discriminating function from a disc cartridge that makes the recording format the same while maintaining the same outer shape, and A multi-function groove having a positioning function 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 6, 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 A guide groove 15 for insertion into the recording and / or reproducing apparatus is 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. 8 and 9, 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, the second opening 44 is formed so as to gradually widen from the center side toward the outer peripheral side in order to absorb an error with the first opening 24, and manufacturing errors and attachments of the rotation wheel 4. The first opening 24 is prevented from becoming small due to an error. For example, the second opening 44 is formed such that both side edges in the radial direction are inclined outward by about 1 °.

  The second opening 44 may be formed so that one of the side edges is inclined outward. When any one of the side edges is inclined outward, the side edge opposite to the operated portion 45 is preferable. This is because when the rotation wheel 4 is rotated and the shutters 5a and 5b are rotated to open the first and second openings 24 and 44, the rotation wheel 4 is slightly rotated from a predetermined position due to an error or the like. Sometimes, one side edge of the second opening 44 of the rotation wheel 4 is positioned inside one side edge in the radial direction of the first opening 24 of the lower shell 7, and the first opening This is to prevent the portion 24 from being narrowed.

  Further, as shown in FIG. 8, 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.

  Further, as shown in FIG. 2, a pair of shutter plates 5 a and 5 b are located on the outer surface of the second opening 44. Therefore, as shown in FIG. 9, a taper portion for preventing the pair of shutter plates 5 a and 5 b from entering the second opening portion 44 at the opposite side edge portions of the second opening portion 44. 44a and 44b are formed. Furthermore, when the shutter plates 5a and 5b close the first and second openings 24 and 44, the rotation wheel 4 is engaged with the shutter plate 5a and prevents the shutter plate 5a from being lifted. A groove 50 is formed. The engaging groove 50 is formed by a piece having a substantially L-shaped cross section with the side edge portion side of the first opening 24 as an opening end.

  In the vicinity of the second opening 44 of the rotation wheel 4, as shown in FIG. 10, there is a shutter opening pin 41 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 to be joined 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. The first operated piece 45a is a piece against which the shutter release pin 41 abuts when the rotation wheel 4 is rotated in the direction in which the shutter plates 5a and 5b open the first and second openings 24 and 44. The second operated piece 45b has the shutter release pin 41 abutted against the rotation wheel 4 when the shutter plates 5a and 5b are rotated in the direction of closing the first and second openings 24 and 44. It becomes a piece. As will be described later, the rotation wheel 4 is urged by the urging member 48 in the direction of arrow A in FIG. 10 where the shutter plates 5a and 5b close the first and second openings 24 and 44. A force larger than that of the second operated piece 45b is applied to the first operated piece 45a. Therefore, the first operated piece 45a is formed larger than the second operated piece 45b so as to increase the mechanical strength. Here, the height h1 of the first operated piece 45a is set to be equal to the second operated piece 45a. It is formed to be larger than the height h2 of the operation piece 45b. The first operated piece 45a is formed higher than the second operated piece 45b to increase the mechanical strength, and the shutter release pin 41 is more reliably engaged.

  The first operated piece 45a has an engagement piece 45d bent inward at the tip. When the rotation wheel 4 is rotated in the direction in which the shutter plates 5a and 5b close the first and second openings 24 and 44, the engagement piece 45d is a shutter release pin on the recording and / or reproducing device side. 41 is prevented from coming off from a recess formed by the first operated piece 45a and the second operated piece 45b. The engagement piece 45d may be provided at the distal end of either the first operated piece 45a or the second operated piece 45b, but is preferably provided at the distal end of the first operated piece 45a. This is because when the first operated piece 45a rotates the rotation wheel 4 in the direction of the arrow A in FIG. 10, the shutter opening pin 41 on the recording and / or reproducing apparatus side comes into contact.

  Note that the shutter release pin 41 on the recording and / or reproducing device side enters from the gap between the tip of the engagement piece 45d and the second operated piece 45b. Further, when the rotation wheel 4 is rotated, the operated portion 45 draws an arc trajectory, and accordingly, the direction of the opening of the operated portion 45 changes in accordance with the trajectory of the operated portion 45. As described above, the engagement piece 45d bends the first operated piece 45a toward the second operated piece 45b, but the size of the engaging piece 45d, that is, the protrusion to the inside of the recess. The amount and inclination are set such that the shutter opening pin 41 is always engaged while the rotation wheel 4 rotates.

  The operated portion 45 configured as described above is exposed to the outside from the front surface of the lower shell 7 in which the first opening 24 is formed as the rotation wheel 4 rotates, and the first opening 24 Move in the width direction. 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.

  In the operated portion 45, as shown in FIG. 11, an engaging groove 45c that engages with the first shutter plate 5a is formed at the base end portions of the first operated piece 45a and the second operated piece 45b. Is formed. When the shutter plates 5a and 5b close the first and second openings 24 and 44, the engagement groove 45c is engaged with the first shutter plate 5a, so that the first shutter plate 5a Prevent ups and downs. Therefore, there is no gap between the peripheral edge portion of the first opening 24 and the first shutter plate 5a, and dust or the like can be prevented from entering the cartridge body 2. That is, the engagement groove 45c of the operated portion 45, together with the engagement groove 50 formed in the vicinity of the second opening 44 of the rotation wheel 4, prevents the first shutter plate 5a from being lifted or lowered. To do. Therefore, there is no gap between the second opening 44 and the shutter plate 5a, and dust or the like can be prevented from entering the cartridge body 2.

  The second operated piece 45b hits a regulating portion 29 that connects the outer peripheral wall 8 and the inner peripheral wall 11 of the upper shell 6 facing a part of the peripheral edge of the first opening 24 of the lower shell 7. Thereby, the rotation area | region of the rotation wheel 4 is controlled.

  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. 9, 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.

  In the rotation wheel 4 as described above, the shutter plates 5a and 5b are urged to rotate in a direction to close the first and second openings 24 and 44 by an urging member 48 formed of a coil spring or the like. . 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. 8 and 9, a flange portion 47 that substantially closes the guide groove 49 is also formed on the outer peripheral edge of the rotation wheel 4.

  As shown in FIG. 12, the locking protrusion 48 b formed on the inner surface of the upper shell 6 has a tip formed on the inner surface of the lower shell 7 when the upper shell 6 and the lower shell 7 are joined. The engaging protrusion 48b to which the urging force of the urging member 48 is applied is reinforced by the substantially cylindrical reinforcing rib 48c.

  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. 13, the larger first shutter plate 5 a includes a first shutter portion 51 that closes the first and second openings 24 and 44, and an inner peripheral surface of the upper shell 6. 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. The 2nd side edge part 51b and the 3rd side edge part 51c are comprised by the taper part in the mutually reverse direction. Moreover, the 1st side edge part 51a engages with the engaging groove 50 formed in the rotation wheel 4, and a lift is prevented.

  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 5a and 5b close the first and second openings 24 and 44, the groove 51f is lifted to the lower shell 7 side by the lifter 14 of the upper shell 6 and the first opening By engaging with the convex portion 27 formed on the peripheral edge portion of the portion 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 thicker than the shutter portion 51 and has a higher strength, and the first support shaft 52 formed on the upper shell 6 is inserted therethrough. A first shaft hole 53a is formed. As shown in FIG. 14, the first support shaft 52 is formed at a height that protrudes from the first rotation support portion 53 when inserted through the first shaft hole 53 a. The tip end portion of the first support shaft 52 is engaged with a bearing portion 57 formed on the lower shell 7, so that the first rotation support portion 53 is supported by the first support shaft 52 even when an impact such as dropping is applied. The strength of the first support shaft 52 is reinforced.

  The second shutter plate 5b engaged 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. The first side edge portion 61a is configured by a taper portion opposite to the taper portion of the second side edge portion 51b of the first shutter portion 51, and the second side edge portion 61b is formed by the first shutter. The taper part of the 3rd side edge part 51c of the part 51 is comprised by the taper part opposite direction. Further, the tapered portion of the first side edge portion 61a and the tapered portion of the second side edge portion 61b are also formed in opposite directions. 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. The taper portion of 61a meshes, and the taper portion of the third side edge portion 51c of the first shutter portion 51 and the taper portion of the second side edge portion 61b of the second shutter portion 61 mesh, respectively. Mesh in the opposite direction. 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.

  Further, when the shutter plates 5 a and 5 b close the first and second openings 24 and 44, the engagement groove 45 c of the operated portion 45 formed in the rotation wheel 4 has a first shutter plate. 5a is engaged, and the engagement groove 50 is engaged with the first side edge portion 51a of the first shutter portion 51, thereby preventing the first shutter plate 5a from being lifted or lowered. Accordingly, there is no gap between the peripheral edge of the first opening 24 and the first shutter plate 5a, and dust and the like are prevented from entering the cartridge body 2.

  A protrusion 61d is formed at the end of the third side edge 61c opposite to the first side edge 61a. The protrusion 61 d is formed in the vicinity of the first opening 24 on the front side of the lower shell 7 when the second shutter plate 5 b closes the first and second openings 24 and 44. The engaging portion 61e is engaged so that dust and the like do not enter from the gap between the first opening 24 and the second shutter plate 5b.

  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 When the first control protrusion 63 moves, the widened portion 64b, that is, the second shutter plate 5b does not act on the latter half when the first and second openings 24 and 44 are opened. It becomes the first non-acting 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.

  As shown in FIG. 15, the tip end portion of the first control protrusion 63 formed on the rotation wheel 4 engages with a clearance groove 63 a formed on the inner surface of the lower shell 7, and the first cam portion 64. To prevent it from falling off due to impact or the like.

  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. As shown in FIG. 16, the distal end portion of the second support shaft 62 a protrudes from the second rotation support portion 62, and the distal end portion engages with a relief groove 62 b formed on the inner surface of the lower shell 7. This prevents the second shaft hole 54 from falling off due to an impact or the like.

  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. 17 shows a state where the pair of shutter plates 5 a and 5 b closes the first and second openings 24 and 44. 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. 17 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 51b of the first shutter portion 51 and the tapered portion of the first side edge portion 61a of the second shutter portion 61 are engaged with each other, and further, the third shutter portion 51 of the first shutter portion 51 is engaged. The taper portion of the side edge portion 51c and the taper portion of the second side edge portion 61b of the second shutter portion 61 are engaged with each other. In addition to preventing, when the shutter plates 5a and 5b are pressed, it is difficult to bend.

  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. 17 against the urging force of the urging member 48 at the operated portion 45, the guide protrusion 51g is engaged with the guide groove 55 of the rotation wheel 4. The combined first shutter plate 5a rotates about the first support shaft 52 of the upper shell 6 in the direction of arrow B in FIG. 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. 18, 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. As the first shutter plate 5a rotates, the second shutter plate 5b is shown in FIG. 17 with respect to the first shutter plate 5a with the second support shaft 62a of the first shutter plate 5a as the center. 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. Thereby, as shown in FIG. 18, the first and second openings 24 and 44 are opened, and the optical disk 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. 17 and 18, 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 FIGS. 17, 18, and 19, 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 a shaft hole 75 through which a support shaft 74 formed on the inner surface of the lower shell 7 is inserted is formed in the base portion 73. The base portion 73 includes a lock portion 76 that locks the rotation of the rotation wheel 4, a lock release piece 77 that is pressed by an insertion guide pin 100 that also functions as a lock release pin on the recording and / or playback device side, A rotation restricting piece 78 for restricting the rotation of the base portion 73 and a locking piece 79 for locking one end of the urging member are formed. 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. 19, the lock member 72 has a lock portion 76 facing inward, a lock release piece 77 in the insertion guide groove 25b, and a main wall of the lower shell 7 on the rising wall constituting the insertion guide groove 25b. It faces from the escape hole 80 formed in parallel . Further, the rotation restricting piece 78 restricts the rotation of the lock member 72 by abutting against the boss 22 continuous with the rising wall.

  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. A coil portion of the urging member 82 is wound around the mounting pin 83. The urging member 82 attached to the attachment pin 83 has one arm portion engaged with the boss 22 and the other end engaged with the locking piece 79 of the lock member. The urging is performed in the direction of arrow D in FIG.

  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. When the rotation wheel 4 is rotated in the direction opposite to the arrow A in FIG. 17, the engagement recess 85 is formed with a substantially vertical wall on the upper side, and is opposed to the vertical wall of the lock portion 76 to be reliably engaged. It has become. The lock portion 76 locks the rotation of the rotation wheel 4 by engaging with the engagement recess 85. As shown in FIG. 20, 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. 9 and 20, the lock groove 84 may have a substantially concave shape in cross section, but in addition to this, a guide having a substantially L shape in cross section having no side wall on the outer peripheral side of the rotation wheel 4 is also possible. May be part.

  The lock member 72 is made of an elastic material having excellent slidability, for example, polyacetal resin, and is formed so that the frictional resistance is small with respect to the lower shell 7 and the support shaft 74.

  Referring to FIG. 17, a state where the shutter plates 5 a and 5 b close the first and second openings 24 and 44 will be described. The locking member 72 is a biasing member 82 around the support shaft 74. 17 is biased 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 formed on the inner side. Therefore, the rotation of the rotation wheel 4 is prohibited when the lock 76 is engaged with the engagement recess 85. Here, for example, even if force forcibly turning the rotation wheel 4 in the counter arrow D direction is applied, at this time, the force in the arrow D direction in FIG. Therefore, the lock member 72 can reliably lock the rotation of the rotation wheel 4.

Further, as shown in FIG. 21, the 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 is provided. It can be pressed. Specifically, the insertion guide groove 25b is open on the front side. The unlocking piece 77 faces the front opening end side further than the end surface 87 of the lower shell 7 at the innermost part of the insertion guide groove 25b , and the insertion guide pin 100 serving as the unlocking pin on the recording and / or reproducing device side is pressed. It is possible. The unlocking piece 77 is faced in the insertion guide groove 25b, thereby preventing an erroneous operation.

When the disc cartridge 1 is inserted into the recording and / or reproducing apparatus, the lock release pin enters the insertion guide groove 25b as shown in FIG. When the insertion guide pin 100 serving as a lock release pin of the recording and / or reproducing apparatus enters the insertion guide groove 25b from the front side opening end, first, the lock release piece 77 is pressed, and then the insertion position of the insertion guide pin 100 is changed. It abuts against an end face 87 that becomes a restricting portion to be restricted. At the same time, the insertion guide pin 100 enters the insertion guide groove 25a side. The lock release piece 77 is pressed by the insertion guide pin 100 until the insertion guide pin 100 hits the end surface 87 that is a restricting portion. Then, as shown in FIG. 17, the lock member 72 rotates about the support shaft 74 in the counter arrow D direction in FIG. 17 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.

As shown in FIG. 23, the extension amount W1 of the unlocking piece 77 to the insertion guide groove 25b is equal to or more than half the width W2 of the insertion guide groove 25b, that is, W1 ≧ W2 / 2. Thereby, the lock release piece 77 is reliably pressed by the insertion guide pin 100 that has entered the insertion guide groove 25b.

  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 D in FIG. 17 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 engagement groove 45c of the operated portion 45 is coupled with the engagement groove 50 formed in the vicinity of the second opening 44 of the rotation wheel 4 as shown in FIG. 5a is prevented from rising and sinking. Further, the second side edge portion 51 b of the first shutter portion 51 and the tapered portion of the first side edge portion 61 a of the second shutter portion 61 are engaged with each other, and the third shutter portion 51 of the first shutter portion 51 is further engaged. The tapered portion of the side edge portion 51c and the tapered portion of the second side edge portion 61b of the second shutter portion 61 are engaged with each other, and are engaged in opposite directions. 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 rotation wheel 4 is lifted to the lower shell 7 side by the lifter 14 of the upper shell 6, and the first shutter portion 51. The groove 51f is engaged with a convex portion 27 formed at the peripheral edge of the first opening 24 to prevent dust and the like from entering the cartridge body 2.

  Further, the lock mechanism 71 will be described. As shown in FIG. 17, the lock member 72 is urged in the direction of arrow D in FIG. 17 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. Therefore, the rotation of the rotation wheel 4 is prohibited when the lock 76 is engaged with the engagement recess 85. Even if force forcibly rotating the rotation wheel 4 in the direction of the anti-arrow D is applied, at this time, the force in the direction of the arrow D in FIG. Therefore, the lock member 72 can reliably lock the rotation of the rotation wheel 4.

Further, as shown in FIG. 21, the 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 is provided. It can be pressed. Specifically, the insertion guide groove 25b is open on the front side. The lock release piece 77 faces the front opening end side further from the end surface 87 of the insertion guide groove 25b , and the insertion guide pin 100 serving as a lock release pin on the recording and / or reproducing apparatus side is in a pressable state.

  The disk cartridge 1 as described above is inserted into the recording and / or reproducing apparatus with the front surface formed in a substantially arc shape as an insertion end. When inserted into the recording and / or reproducing apparatus, first, a pair of insertion guide pins 100 formed on the mounting portion of the recording and / or reproducing apparatus is inserted. Here, as shown in FIG. 7, the insertion guide grooves 25a and 25b are formed so that the front opening end side is widest, so that the disc cartridge 1 can be reliably guided to a predetermined position of the mounting portion. The location hole provided in the bottom surface of the cartridge main body 2 by the insertion guide pins 100 and 100 on the recording and / or reproducing device side engaging with the insertion guide grooves 25a and 25b immediately before being attached to the attachment portion. A positioning pin provided in the mounting portion is surely engaged with 26a and the alignment hole 26b. 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.

  Note that when a disk cartridge having the same outer shape as that of the disk cartridge 1 but having a different recording format is inserted, the disk guide is not provided with the insertion guide groove 25a, so that the insertion guide for the insertion guide groove 25a is inserted. The pin 100 can be prevented from being attached to the attachment portion, and erroneous insertion can be prevented. Also, when the disc cartridge 1 is inserted upside down and front and back, the insertion guide grooves 25a and 25b are formed by opening the front and bottom surfaces of the cartridge body 2, so that the insertion guide pins 100 and 100 are formed. However, by not engaging the insertion guide grooves 25a and 25b, erroneous insertion can be prevented.

  Furthermore, the insertion guide pin 100 having a thickness substantially the same as the width of the insertion guide groove 25a is brought into contact with the innermost portion of the insertion guide groove 25a when it is attached to the attachment portion of the recording and / or reproducing apparatus. By doing so, positioning in the X direction and the Y direction orthogonal to each other in the mounting surface is performed. 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 will be performed.

  Further, the small disk cartridge 1 is inserted into a recording and / or reproducing apparatus corresponding to a large disk cartridge and two disk cartridges capable of recording and reproducing the disk cartridge 1 while maintaining the same recording format as the small disk cartridge 1. When this is done, the insertion guide pins 100, 100 are engaged with the insertion guide grooves 25a, 25b, thereby positioning the mounting portion. That is, the positioning at the mounting portion is not performed by engaging the positioning pin provided at the mounting portion with the location hole 26a and the alignment hole 26b provided at the bottom surface of the cartridge main body 2. In this case, the disk cartridge 1 is further pressed from the back side by an urging means or the like in the insertion direction, so that the insertion guide pins 100 and 100 are abutted against the innermost part of the insertion guide grooves 25a and 25b. Only the pins 100 and 100 and the insertion guide grooves 25a and 25b are used to accurately position the mounting portion. In this disc cartridge 1, since the location hole 26a and the alignment hole 26b are not used and the mounting portion can be positioned only by the insertion guide grooves 25a and 25b, the positioning mechanism on the recording and / or reproducing apparatus side is simplified. Can do.

  As shown in FIG. 24, the insertion guide pin 100 engages with the location hole 26a and the alignment hole 26b when mounted on the mounting portion of the recording and / or reproducing apparatus. Here, the location hole 26a is a reference hole for mounting the disc cartridge 1, and the alignment hole 26b is an adjustment hole. When the disc cartridge 1 is inserted into a recording and / or reproducing apparatus, it is necessary to press the lock release piece 77 of the lock member 72 against the urging force of the urging member 82. Accordingly, the lock release piece 77 is provided in the insertion guide groove 25b on the alignment hole 26b side on the adjustment side so that the positioning at the mounting portion can be performed more accurately.

When the disk cartridge 1 is mounted to the mounting portion, the insertion guide pin 100 is in the lock release pin, when entering from the front side opening end in the insertion guide groove 25b, firstly, to press the unlocking piece 77, and then, It hits the end face 87. Unlocking piece 77, by the insertion guide pin 100, the insertion guide pin 100 is pressed until it hits the end face 87. At this time, as shown in FIG. 23, extending volume W1 of the insertion guide groove 25b of the lock release piece 77, since it is equal to or greater than half of the width W2 of the insertion guide groove 25b, the unlocking piece 77, It is surely pressed by the insertion guide pin 100 that has entered the insertion guide groove 25b. Then, as shown in FIG. 17, the lock member 72 rotates about the support shaft 74 in the counter arrow D direction in FIG. 17 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 mounted on the mounting portion of the recording and / or reproducing apparatus, the rotation wheel 4 is a recess formed by the first operated piece 45a and the second operated piece 45b of the operated portion 45. The shutter release pin 41 on the recording and / or reproducing apparatus side is engaged with the shutter, and the shutter release pin 41 is rotated in the direction of the arrow A in FIG. 17 against the urging force of the urging member 48. Then, the first shutter plate 5a having the guide protrusion 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. As the first shutter plate 5a rotates, the second shutter plate 5b is shown in FIG. 17 with respect to the first shutter plate 5a with the second support shaft 62a of the first shutter plate 5a as the center. 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.

  Further, when the rotation wheel 4 rotates in a direction opposite to the arrow A in FIG. 18, 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. 18. Move to the other end. As the first shutter plate 5a rotates, the second shutter plate 5b is centered on the second support shaft 62a of the first shutter plate 5a with respect to the first shutter plate 5a in FIG. 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.

  As described above, when the second shutter plate 5b opens the first and second openings 24 and 44, the first control protrusion 63 and the first action portion of the rotation wheel 4 are used in the first half. The second shutter plate 5b is rotated by the narrow portion 64a of the first cam portion 64, and the second control projection 66 and the second action portion of the second shutter plate 5b are used in the second half portion. The second shutter plate 5b is rotated by the second curved portion 65b of the second cam portion 65. As described above, in the disk cartridge 1, when the second shutter plate 5b opens the first and second openings 24 and 44, the operating portion is divided into the first half portion and the second half portion, and the sliding area of one portion is divided. By reducing the first control protrusion 63 of the rotation wheel 4 and the narrow portion 64a of the first cam portion 64 serving as the first action portion and the second control of the second shutter plate 5b. Dust and the like are prevented from being generated by abrasion from the projection 66 and the second curved portion 65b of the second cam portion 65 that is the second action portion.

  Here, the operated portion 45 of the rotation wheel 4 to which the shutter release pin 41 on the recording and / or reproducing apparatus side is engaged is an engagement piece bent inwardly at the distal end portion of the first operated piece 45a. 45d is provided. Therefore, in the recess formed by the first operated piece 45a and the second operated piece 45b constituting the operated part 45, the shutter release pin 41 is reliably secured by the engaging piece 45d bent inward. It is possible to prevent the shutter release pin 41 from dropping from the operated portion 45 when the rotation wheel 4 is rotated.

  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 disc 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. 18 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.

  The operated portion 45 engaged with the shutter release pin 41 that rotates the rotation wheel 4 described above is specifically configured as shown in FIGS. 26 (A) and 26 (B). Here, FIG. 26A shows the operated portion 45 when the pair of shutter plates 5a and 5b starts to move in the direction of opening the first and second openings 24 and 44. FIG. (B) shows the operated portion 45 when the pair of shutter plates 5a, 5b opens the first and second openings 24, 44. FIG.

  As shown in FIG. 26 (A), the shutter release pin 41 is inserted into the recessed portion of the operated portion 45 from the direction of arrow E in FIG. 26 (A), and the shutter release pin 41 is operated to rotate the rotation wheel 4. Is started, it hits the first operated piece 45a. At this time, a force in the direction of arrow Fy in the insertion direction of the shutter release pin 41 is applied to the shutter release pin 41, and an urging member 48 that urges the rotation wheel 4 in the direction of arrow A in FIG. A force in the Fx direction due to the force is applied, and a force in the F direction is added as a resultant force. At this time, the operating point of the first operated piece 45a is on the inclined surface 45f adjacent to the inner surface 45e of the engaging piece 45d at the tip.

  The operated portion 45 draws a circular arc locus while the rotation wheel 4 is rotated to open the first and second openings 24 and 44, and accordingly, the orientation of the opening portion of the operated portion 45. Also changes in accordance with the trajectory of the operated portion 45.

  When the pair of shutter plates 5a and 5b open the first and second openings 24 and 44, as shown in FIG. 26B, the shutter opening pin 41 has an arrow in the insertion direction of the shutter opening pin 41. While a force in the Fy direction is applied, a force in the Fx direction due to the urging force of the urging member 48 that urges the rotation wheel 4 in the direction of arrow A in FIG. 26B is applied, and a force in the F direction is added as a resultant force. At this time, the operating point of the first operated piece 45a moves from the inclined surface 45f to the inner surface 45e of the engaging piece 45d at the tip.

  As shown in FIGS. 26 (A) and 26 (B), the operated portion 45 is the first from when the pair of shutter plates 5a, 5b closes the first and second openings 24, 44. When the second openings 24 and 45 are opened, the inner surface 45e of the engagement piece 45d at the tip of the first operated piece 45a is always in the direction of arrow E, which is the insertion direction of the shutter release pin 41. On the other hand, it is in a state of being inclined toward the inside of the recess of the operated portion 45, that is, toward the second operated piece 45b. As a result, the shutter opening pin 41 opens the first and second openings 24 and 45 from when the pair of shutter plates 5a and 5b closes the first and second openings 24 and 44. For this reason, it is always engaged with one or both of the first operated piece 45a and the engaging piece 45e constituting the operated portion 45, and the drop off during the rotation operation of the rotation wheel 4 is prevented. Become. Therefore, the engagement piece 45e may be inclined further inward than the angle shown in FIGS. 26 (A) and 26 (B).

  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 a principal part perspective view of the front side of the said upper shell. 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 explaining 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 principal part perspective view explaining the to-be-operated part formed in the rotation wheel. It is a principal part perspective view explaining the raising prevention mechanism of a shutter board | plate. It is principal part sectional drawing explaining the latching protrusion of the urging member which urges | biases a rotation wheel to one direction. It is a perspective view which shows a shutter plate and a rotation wheel. It is principal part sectional drawing explaining the rotation support structure of a 1st shutter board. It is principal part sectional drawing explaining the guide mechanism of a 1st shutter board. It is principal part sectional drawing explaining the rotation support structure of a 2nd shutter board. 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 principal part sectional drawing which shows the state by which the lock release pin is not inserted in the insertion guide groove in which the lock release piece was faced. It is principal part sectional drawing which shows the state by which the lock release pin was inserted in the insertion guide groove. It is a principal part front view explaining the relationship between the width | variety of an insertion guide groove, and the extension amount of a lock release pin. It is a top view which shows the relationship between an insertion guide groove, a location hole, and an alignment hole. It is a perspective view of a disc cartridge showing a state where a first opening is opened. It is a principal part top view of the to-be-operated part of the rotation wheel which a shutter open | release pin engages, (A) is the object when a pair of shutter plates start to move in the direction to open the first and second openings. The position of the operation part is shown, and (B) shows the position of the operated part when the pair of shutter plates opens the first and second openings 24 and 44.

Explanation of symbols

1 disc cartridge, 2 cartridge body, 3 optical disc, 4 rotation wheel, 5a, 5b shutter plate, 6 upper shell, 7 lower shell, 25a, 25b insertion guide groove, 41 shutter release pin, 45 operated part, 45a first Operated piece, 45b Second operated piece, 45c Engaging groove, 45d Engaging piece, 45e Inner surface, 45f Inclined surface, 50 Engaging groove, 71 Lock mechanism, 72 Lock member, 73 Base part, 74 Support shaft, 75 Shaft hole, 76 Locking part, 77 Unlocking piece, 100 Insertion guide pin

Claims (2)

A cartridge body having a first opening for recording and / or reproduction formed on the bottom surface;
A recording and / or reproducing device in which a second opening corresponding to the first opening for accommodating the disk and exposing the stored disk to the outside is formed and is rotatably stored in the cartridge body. An operation portion that is a concave portion that engages with a shutter opening portion on the recording and / or reproducing apparatus side is formed facing the front surface of the cartridge main body that is an insertion end of the shutter, and a shutter that is engaged with the operation portion A rotation wheel that rotates by an opening,
The cartridge main body has a pair of first and second shutter plates that are positioned between the bottom surface of the cartridge main body where the first opening is formed and the rotation wheel and rotate in conjunction with the rotation of the rotation wheel. A shutter mechanism that opens the first opening and the second opening when the first opening and the second opening coincide with the rotation of the rotation wheel;
A shaft portion rotatably attached to the cartridge main body and an engagement recess on a surface of the rotation wheel that faces the bottom surface of the cartridge main body are engaged with the rotation wheel so that the shutter mechanism has a first shutter mechanism. A lock member having a lock portion that locks at a position where the opening is closed, and a lock release piece that releases a state in which the lock portion is engaged with the engagement recess,
On the front side of the first opening on the bottom surface of the cartridge body, a tapered portion is formed to accommodate the operated portion when the shutter mechanism opens the first opening.
The first shutter plate is rotatably attached to the cartridge body, and is rotated along with the rotation of the rotation wheel.
The second shutter plate is rotatably attached to the first shutter plate, and rotates with the rotation of the first shutter plate.
On both sides of the bottom surface of the cartridge body, a front surface serving as an insertion end to the recording and / or reproducing apparatus and a bottom surface of the cartridge body are opened, and a groove portion is formed from the front surface of the cartridge body toward the back surface.
One of the groove portions is formed to have a width substantially equal to the thickness of the insertion guide pin on the recording and / or reproducing apparatus side, at least the innermost portion engaging with the one groove portion,
The other of the groove portions is formed wider than the thickness of the insertion guide pin on the recording and / or reproducing apparatus side that engages with the other groove portion,
On the bottom surface of the cartridge body, a location hole is formed in the extending direction of one groove, and an alignment hole is formed in the extending direction of the other groove,
On the other side of the groove, the unlocking piece of the lock member is exposed,
The disk member, wherein the lock member rotates when the lock release piece is pressed by an insertion guide pin that enters the other of the groove portions, and releases the state in which the lock portion is engaged with the engagement recess.   2. The disc cartridge according to claim 1, wherein one of the groove portions is a discriminating portion with a further disc cartridge having substantially the same outer shape and a different disc recording format.

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