JP2006286134A - Disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect a disk and to prevent the intrusion of a foreign matter such as dust into a cartridge main body by preventing the displacement of a shutter plate even when a cartridge receives shocks from the outside. <P>SOLUTION: This cartridge includes a cartridge main body 2 formed by combining an upper shell 6 with a lower shell 7 having a recording and/or reproducing first opening 24, a rotation wheel 4 which is rotatably housed in the cartridge main body and houses an optical disk 3, and has a second opening 44 formed corresponding to a first opening 24 to cause the optical disk to face the outside, and a pair of shutter plates 5a and 5b which is positioned between the lower shell 7 and the rotation wheel 4 and opens the first and second openings 24 and 44 when the first openings 24 and second openings 44 coincide in association with the rotation of the rotation wheel. The lower shell 7 includes a displacement regulation projection 36 formed to regulate the displacement of the tip side of the shutter plate 5a, and the shutter plate 5a is engaged between the main surface part of the lower shell 7 and the displacement regulation projection 36. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disc cartridge that prevents displacement at the time of impact of a shutter plate that opens and closes an opening that exposes a part of the disc to the outside.

  There is a disk cartridge as described in Patent Document 1 below. The disk cartridge of Patent Document 1 includes an inner rotor and a pair of shutter plates in a cartridge body, and an optical disk is accommodated in the inner rotor. The inner rotor rotates inside the cartridge body, and when the opening that faces the outside of the optical disk coincides with the opening of the cartridge body, the pair of shutter plates opens these openings and exposes the stored optical disk to the outside. I will. An optical disc used for this type of disc cartridge records information signals at a very high density. Therefore, if foreign matter such as dust adheres to the signal recording surface, accurate information signal recording and reproduction can be performed. It becomes impossible. For this reason, this disc cartridge uses a pair of shutter plates for the shutter mechanism that closes the opening, and when not in use, the two shutter plates are joined to eliminate a gap and prevent foreign matter from entering the cartridge body. It has become. Specifically, the pair of shutter plates of the disk cartridge is configured to rotate in conjunction with the rotation of the inner rotor by inserting a support shaft through a shaft hole provided in the shutter plate.

  However, when the disk cartridge is dropped from a high place, the shell constituting the cartridge main body, the inner rotor in the cartridge main body, and the shutter plate are deformed by impact. Further, in the disk cartridge, the inner rotor is temporarily rotated by this impact, and at this time, the tip of the shutter plate may flutter. Then, the front end of the shutter plate may enter the inside of the optical disk accommodated from the opening of the inner rotor due to the flapping. When the leading end of the shutter plate enters the inner rotor and the leading end of the shutter plate contacts the optical disc, the optical disc is soiled. When the optical disk is soiled, it is impossible to accurately record the information signal on the optical disk, and it may be impossible to accurately read the information signal recorded on the optical disk. Further, if the rotational position of the inner rotor is displaced due to an impact, for example, the recording and / or reproducing device side mechanism that rotates the inner rotor cannot rotate the inner rotor, and recording and / or recording is performed. Or it may cause a failure of the playback device.

  Further, in the case of a disk cartridge, even when the inner rotor does not rotate at the time of impact, the shutter plate may flutter, foreign matter such as dust may enter the cartridge body from the gap, and the entered foreign matter may adhere to the optical disc. If foreign matter adheres to the optical disk, similarly, recording and reproduction of the optical disk cannot be performed accurately.

JP 2003-109343 A

  The present invention has been made in view of the above-described problems, and an object of the present invention is to prevent the displacement of the shutter plate even when the cartridge receives an impact from the outside, to protect the disk and into the cartridge body. It is an object of the present invention to provide a disc cartridge that can prevent foreign substances such as dust from entering.

  Another object of the present invention is to provide a disk cartridge that can smoothly rotate a shutter plate.

  A further object of the present invention is to provide a disc cartridge that is easy to manufacture.

  A disc cartridge according to the present invention comprises a cartridge body comprising a lower shell in which a first opening for recording and / or reproduction is formed, and an upper shell attached to the lower shell; A rotation wheel having a second opening corresponding to the first opening for storing the disk in a movable manner, storing the disk, and facing the stored disk to the outside; the lower shell; and the rotation wheel; The first opening and the second opening are opened when the first opening coincides with the second opening in conjunction with the rotation of the rotation wheel. And a shutter mechanism having at least one shutter plate. The lower shell is formed with a displacement restricting projection for restricting the displacement of the front end side of the shutter plate. When the shutter plate closes the first and second openings, the main surface portion of the lower shell And the displacement restricting projection.

  According to the present invention, when the shutter plate closes the first and second openings, the shutter plate is engaged between the main surface portion of the lower shell and the displacement restricting projection. Fluttering is prevented, and a gap or the like is prevented from being generated between the shutter plate and the cartridge body, and the disk is protected and foreign matter such as dust is prevented from entering the cartridge body.

  Hereinafter, a disc cartridge to which the present invention is applied will be described with reference to the drawings. The disc cartridge to which the present invention is applied is a small 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 FIGS. 1 to 3, a disk cartridge 1 to which the present invention is applied includes a rotation wheel 4 in which an optical disk 3 is accommodated in a cartridge body 2 and a pair of first and second shutters. The shutter plates 5a and 5b are accommodated. 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 a magneto-optical disk, a magnetic disk, or the like in addition to an optical disk, and may further be a cleaning disk.

  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 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, on the inner peripheral side of the outer peripheral wall 8, a substantially annular inner peripheral wall 11 for rotatably accommodating the rotation wheel 4 is formed 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 housed 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 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. The optical pickup opening 24a is formed to be large enough to allow the optical pickup of the recording and / or reproducing apparatus to enter the inside of the cartridge body 2, and the rotation drive opening 24b is used for recording and / or reproducing. The disk table constituting the disk rotation drive mechanism of the apparatus is formed to have a size sufficient to enter the inside of the cartridge main 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 is accommodated by the operated portion 45 when the operated portion 45 of the rotation wheel 4 described later is positioned in a state where the first and second shutter plates 5a and 5b open the first opening portion 24. It becomes a part to be done.

  A pair of first and second shutter plates 5a and 5b are formed on one side edge of the recording / reproducing opening 24a constituting the first opening 24 and on one side edge of the rotation driving opening 24b. A plurality of convex portions 27 are formed to prevent dust and the like from entering the cartridge body 2 when the first opening 24 is 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 FIGS. 2 and 3, the upper shell 6 and the lower shell 7 are inserted into the screw holes of the bosses 10 of the upper shell 6 by inserting screws 23 through the through holes of the bosses 22 of the lower shell 7. Combined by.

  Further, on the front surface of the lower shell 7, on both sides, there are insertion guide grooves 25a, which engage with 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. 25b is formed. The insertion guide grooves 25a and 25b are formed so that the front opening end side is widest, and the insertion guide pins are easy to enter.

  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 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. 6 and 7, 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 when the concave side is disposed in the cartridge body 2, the upper shell 6 and one main surface portion of the first and second shutter plates 5a and 5b are formed. Configure the disk storage. 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 or any one of the side edges in the radial direction are inclined outward by about 1 °.

  Further, 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, the shutter opening pin 41 constituting the shutter opening mechanism on the recording and / or reproducing apparatus side is engaged in the vicinity of the second opening 44 of the rotation wheel 4 as shown in FIGS. An operated portion 45 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 opens the shutter when the rotation wheel 4 rotates in the direction in which the first and second shutter plates 5a and 5b open the first and second openings 24 and 44. The pin 41 is a piece against which the second operated piece 45b contacts the rotation wheel 4 in the direction in which the first and second shutter plates 5a and 5b close the first and second openings 24 and 44. When rotating, the shutter opening pin 41 comes into contact with the piece.

  The operated part 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 is provided. Move in the width direction. When the first and second shutter plates 5a and 5b open the first opening 24, the operated portion 45 is located at a portion widened by the tapered portion 24c.

  In the operated portion 45, an engagement 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. When the first and second 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, thereby This prevents the one shutter plate 5a from rising or sinking. Accordingly, 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.

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

  A pair of first and second 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, As shown in FIG. 8, the first shutter plate 5a is large and the second shutter plate 5b is smaller than the first shutter plate 5a.

  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 the outer peripheral wall 8 and the inner peripheral wall 11. A first rotation support portion 53 that is rotatably supported by a first support shaft 52 formed therebetween, and a second shaft hole 54 to which the smaller second shutter plate 5b is attached.

  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 includes bosses 10 and 22 formed at one corner portion of the upper shell 6 and the lower shell 7, and a location hole 26a. The escape portion 51e is used to escape an erroneous recording prevention member. The 2nd side edge part 51b and the 3rd side edge part 51c are comprised by the taper part in the mutually reverse direction.

  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. . The groove 51 f is a convex portion 27 formed on the peripheral edge of the first opening 24 when the first and second shutter plates 5 a and 5 b close the first and second openings 24 and 44. By engaging with, dust and the like are prevented from entering the cartridge main body 2.

  Further, the first shutter portion 51 is formed with first and second restricting protrusions 51h and 51g for restricting the displacement of the first shutter plate 5a on the surface on the optical disc 3 side. The first and second restriction projections 51h and 51g are formed in the center hole 3a of the optical disc 3 when the first and second shutter plates 5a and 5b close the first and second openings 24 and 44. Even if the first shutter plate 5a is pushed and displaced inward, it is provided at a position corresponding to the surrounding inner peripheral non-signal recording area so as not to damage the signal recording area of the optical disc 3. Yes. The first and second restricting projections 51h and 51g are formed from the center of the rotation wheel 4 when the first and second shutter plates 5a and 5b open the first and second openings 24 and 44. The second opening 44 enters the clearance grooves 55 and 56 opened on the side, so that the rotation of the first shutter plate 5a is not hindered. The escape grooves 55 and 56 are also bottomed grooves, which are separated from the opposite side of the rotation wheel 4 in which the optical disk 3 is stored, and are generated by contact with the first and second restricting protrusions 51h and 51g. Foreign matter such as abrasion powder is prevented from entering the space in which the optical disk 3 is stored. The displacement of the first shutter plate 105a may be restricted by any one of the restricting protrusions.

  Further, the first shutter portion 51 is formed with a driving protrusion 51 i, and this driving protrusion 51 i is engaged with a driving groove 49 formed on the main surface portion of the rotation wheel 4. The drive groove 49 is a bottomed groove so that foreign matter such as abrasion powder does not enter the rotation wheel 4 in which the optical disk 3 is accommodated. The drive protrusion 51 i controls the rotation of the first shutter plate 5 a as the rotation wheel 4 rotates. The drive groove 49 is formed with the first non-acting portion 49a at the position of the drive projection 51i when the first shutter plate 5a closes the first and second openings 24 and 44, that is, at one end. Then, the action portion 49b is formed continuously to the first non-action portion 49a, and the position of the drive protrusion 51i when the first shutter plate 5a opens the first and second openings 24, 44, that is, A second non-acting portion 49c is formed at the other end. The first and second non-acting portions 49a and 49c are formed so as to coincide with the trajectory of the driving projection 51i when the rotation wheel 4 is rotated or to have a wide width and make the driving projection 51i and the groove non-contact. The action portion 49b can be formed by making it different from the locus of the drive protrusion 51i. When the drive projection 51i is in the first and second non-acting portions 49a and 49c, only the rotation wheel 4 is rotated and the first shutter plate 5a is not rotated. At this time, the non-acting portions 49a and 49c perform a posture control function for preventing the first shutter plate 5a from flapping.

  Therefore, when the first shutter plate 5a starts to rotate, the driving force of the shutter opening mechanism on the recording and / or reproducing device side is the driving force and rotation wheel for rotating the rotation wheel 4 against the biasing member 48. Only the driving force for releasing the engagement state between the first protrusion 59a formed in the vicinity of the fourth second opening 44 and the first recess 58a of the first shutter plate 5a is required, A driving force for rotating the first shutter plate 5a is not necessary, and the driving force as a whole can be reduced. The second non-acting portion 49c is formed to absorb an error in the rotation amount of the rotation wheel 4. When the driving projection 51i is in the second non-acting portion 49c, the rotation wheel 4 rotates. The first shutter plate 5a does not rotate.

  The first rotation support portion 53 of the first shutter plate 5a is formed with a cylindrical portion, and a first shaft hole through which the first support shaft 52 formed in the upper shell 6 is inserted at the center. 53a is formed. Therefore, the first shutter plate 5 a is rotatably attached to the upper shell 6 and rotates on the rotation wheel 4. The first shutter plate 5a may be pivotally supported by a support shaft formed on the lower shell 7 instead of the first support shaft 52.

  The first shutter plate 5a rotatably attached to the first support shaft 52 of the upper shell 6 and the rotation wheel 4 are connected by an urging member 48 composed of a coil spring or the like, and this urging member 48 The rotation wheel 4 is urged to rotate in the direction of arrow A in FIG. 9 where the first and second shutter plates 5a, 5b close the first and second openings 24, 44. As shown in FIG. 9, 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 the first rotation of the first shutter plate 5a. The moving support 53 is locked to a locking protrusion 48b formed in the vicinity of the first shaft hole 53a. The urging member 48 includes a locking projection 48b of the first rotation support portion 53 of the first shutter plate 5a that is rotatably attached to the first support shaft 52 of the upper shell 6 and the rotation wheel 4. By being locked by the locking piece 48 a, the curved portion is arranged along the outer periphery of the ring portion 43 of the rotation wheel 4. The urging member 48 always rotates the rotation wheel 4 in the direction of arrow A in FIG. 9 in which the first and second shutter plates 5a and 5b close the first and second openings 24 and 44. When the first and second openings 24 and 44 are rotated in the direction to open, the first and second openings 24 and 44 extend.

  The locking protrusion 48b formed on the first rotation support portion 53 of the first shutter plate 5a is formed in the vicinity of the first shaft hole 53a, that is, in the vicinity of the rotation fulcrum. The radius of the arc-shaped locus drawn when the first shutter plate 5a is rotated is made small so that the locking projection 48b does not collide with the outer peripheral walls 8, 21 of the upper and lower shells 6, 7.

  Incidentally, as shown in FIGS. 8 and 9, the first shutter plate 5 a and the rotation wheel 4 have a first drop-off prevention that prevents the first shutter plate 5 a from dropping from the main surface portion of the rotation wheel 4. A mechanism 31 is provided. The first drop-off prevention mechanism 31 includes a drop-off prevention protrusion 32 formed on a protruding piece 32a formed adjacent to the first rotation support portion 53 of the first shutter plate 5a, and the main part of the rotation wheel 4. A drop-off preventing groove 33 formed from the inner side toward the outer periphery is provided on the surface part.

As shown in FIGS. 8 and 9, the drop-off preventing projection 32 on the first shutter plate 5a side is formed with a retaining portion 32c that is formed to project from the tip of the shaft portion 32b that is integrally formed with the projecting piece 32a. Being done. On the other hand, as shown in FIGS. 6, 7, and 9, the drop-off preventing groove 33 formed on the main surface portion of the rotation wheel 4 is located on the substantially opposite side of the operated portion 45, from the middle to the outer peripheral portion. Is open. The dropout prevention groove 33 has a wide opening end so that the dropout prevention protrusion 32 can easily enter. Further, as shown in FIG. 10, the dropout prevention groove 33 is a through groove, and thin portions 33 a are formed on both sides of the through groove on the mounting surface side of the optical disc 3. The retaining portion 32c of the drop preventing projection 32 is prevented from coming off by engaging with the thin portion 33a. The drop-off prevention groove 33 is formed so that the groove width W1 is larger than the diameter W2 of the shaft part 32b of the drop-off prevention protrusion 32 through which the groove width W1 is inserted, and when the drop-off prevention protrusion 32 enters the drop-off prevention groove 33, the shaft part 32 b is formed on both end surfaces 33 b of the drop-off prevention groove 33, that is, so as not to contact the width direction of the drop-off prevention groove 33. Thereby, the drop-off prevention protrusion 32 does not come into contact with the drop-off prevention groove 33, and it is possible to prevent foreign matters such as wear powder from being generated in the cartridge body 2. Further, the depth D in the thin portion 33a is formed so as to be deeper than the thickness T of the retaining portion 32c, that is, D> T, so that the optical disc 3 and the retaining portion 32c do not come into contact with each other. Yes. The thin portion 33a prevents the retaining portion 32c from projecting toward the optical disc 3 when the first and second shutter plates 5a and 5b are in the state of closing the first and second openings 24 and 44. .
Further, the depth D in the thin portion 33a is formed to be thinner than the thickness T of the retaining portion 32c so that the optical disc 3 and the retaining portion 32c do not come into contact with each other.

  The drop-off prevention protrusion 32 engages with the drop-off prevention groove 33 when the first and second shutter plates 5a and 5b close the first and second openings 24 and 44, and the first shutter The plate 5 a is prevented from falling off from the main surface portion of the rotation wheel 4. There is a possibility that the first shutter plate 5a may fall off from the main surface portion of the rotation wheel 4 due to a large impact on the disk cartridge 1, and the first and second shutter plates 5a and 5b are the first and second openings. This is because 24 and 44 are not used.

  The first and second shutter members 5a and 5b are members disposed between the rotation wheel 4 and the lower shell 7, and are provided on the first rotation support portion 53 of the first shutter member 5a. The formed drop-off prevention protrusion 32 protrudes toward the rotation wheel 4 that is the upper shell 6 side. As shown in FIGS. 3, 5, and 11, on the inner surface of the lower shell 7, when the drop prevention protrusion 32 of the first shutter plate 5 a enters the drop prevention groove 33 of the rotation wheel 4 on the back side. A lifter 35 that lifts the first shutter member 5a toward the rotation wheel 4 is formed. The lifter 35 has a tapered portion 35a on the rotation wheel 4 side so that the first shutter plate 5a can be lifted smoothly.

  As shown in FIG. 9, a stopper piece 34 is formed in the ring portion 43 of the rotation wheel 4 in the vicinity of the dropout prevention groove 33 along the circumferential direction. As shown in FIG. 9, when the first and second shutter plates 5a and 5b block the first and second openings 24 and 44, the first and second shutter plates 5a and 5b The first rotation support portion 53 of one shutter plate 5a is positioned, and the urging member 48 extends. Therefore, the urging member 48 extending along the ring portion 43 may be a hindrance when the drop-off prevention protrusion 32 enters and leaves the drop-off prevention groove 33. The stopper piece 34 formed along the outer periphery of the ring portion 43 restricts the biasing member 48 from violating when the biasing member 48 expands and contracts, and the drop-off prevention protrusion 32 can smoothly enter and leave the drop-off prevention groove 33. I am doing so.

  The drop-off prevention protrusion 32 and the drop-off prevention groove 33 are configured such that the drop-off prevention protrusion 32 is replaced with the drive protrusion 51 i described above by bringing the drop-off prevention protrusion 32 into contact with the drop-off prevention groove 33, and the drop-off prevention groove 33 is replaced with the drive groove 49. It may be replaced with. Thereby, it is not necessary to form the drive protrusion 51i and the drive groove 49, and the configuration of the first shutter plate 5a and the rotation wheel 4 can be simplified.

  Further, as shown in FIG. 11, the lower shell 7 is integrally formed with a displacement restricting projection 36 for preventing fluttering of the front end portion of the first shutter plate 5a, that is, displacement. When the first shutter plate 5a closes the first and second openings 24 and 44, the displacement restricting projection 36 is engaged with the tip of the first shutter plate 5a, and an impact is applied. This prevents fluttering of the tip of the first shutter plate 5a due to vibrations such as when. A thin-walled portion 37 is formed at the tip of the first shutter plate 5a so that it can smoothly enter and engage between the main surface portion of the lower shell 7 and the displacement regulating projection 36. Further, the first shutter plate 5a is thinned as a whole by forming a thin portion 37 at the tip. On the other hand, a lifter 38 is formed on the main surface portion of the rotation wheel 4 on which the first shutter plate 5a is disposed, as shown in FIGS. The lifter 38 lifts the first shutter plate 5a toward the lower shell 7 so that the thin portion 37 at the tip of the first shutter plate 5a is smoothly engaged with the displacement restricting projection 36. .

  As shown in FIGS. 8 and 9, the second shutter plate 5 b that engages with the first shutter plate 5 a as described above, together with the first shutter portion 51, the first and second openings 24, 44, 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 first and second shutter plates 5 a and 5 b close the first and second openings 24 and 44, the second side edge portion 51 b of the first shutter portion 51 and the second shutter portion 61 The taper portion of the first side edge portion 61 a is engaged with the taper portion of the third side edge portion 51 c of the first shutter portion 51 and the taper portion of the second side edge portion 61 b of the second shutter portion 61. The parts mesh with each other, and each meshes in the opposite direction. Therefore, when the pair of first and second shutter plates 5a and 5b closes the first and second openings 24 and 44, the first and second shutter plates 5a and 5b mesh with each other. Thus, it is possible to prevent dust and the like from entering the inside from the coupling portion, and to prevent bending when the first and second shutter plates 5a and 5b are pressed.

  Further, as shown in FIG. 8, the first side edge portion 51a of the first shutter portion 51 is formed with a linear first concave portion 58a, and the rotation wheel 4 meshing with the first side edge portion 51a. A first protrusion 59a that engages with the first recess 58a is formed on the side edge of the second opening 44. The second side edge portion 51b of the first shutter portion 51 is formed with a linear second recess 58b, and the first side edge portion 61a meshing with the second side edge portion 51b includes A second protrusion 59b that engages with the second recess 58b is formed. Further, the third side edge portion 51c of the first shutter portion 51 is formed with a linear third recess 58c, and the second side edge portion 61b engaged with the third side edge portion 51c has A third protrusion 59c is formed. The second shutter portion 61 is also formed with a fourth recess 58e that engages with the first protrusion 59a of the rotation wheel 4. In the first to fourth recesses 58a to 58e and the first to third protrusions 59a to 59c, the first and second shutter plates 5a and 5b block the first and second openings 24 and 44. At times, they are engaged with each other so that dust and the like do not enter inside from the connecting portion. Note that the shutter plate provided with the recesses and the protrusions is not limited to the above example, and the same effect can be obtained even if the shutter plate is reverse to this example.

  As shown in FIGS. 8, 12, and 13, a second support shaft 62 a is formed on the second rotation support portion 62. The second support shaft 62a is inserted into a second shaft hole 54 formed in the first rotation support portion 53 of the first shutter plate 5a in a state in which the second support shaft 62a is prevented from falling off by the second dropout prevention mechanism 60. Is done. Specifically, the second support shaft 62a is composed of elastic pieces 62c and 62d formed through the slit 62b as the second drop-off prevention mechanism 60, and further, the tip portions of the elastic pieces 62c and 62d. Are formed with locking portions 62e and 62f that serve as retaining portions extending from the tip side. These locking portions 62e and 62f are guide portions whose outer surfaces are R surfaces (curved surfaces) or C surfaces (inclined surfaces). The locking portions 62e and 62f are formed so that the base end side is larger than the diameter of the second shaft hole 54 of the first shutter plate 5a through which the second support shaft 62a is inserted. Further, around the second shaft hole 54, a concave portion 54a in which the locking portions 62e and 62f are locked is formed. The second support shaft 62 a is guided by the guide portions of the locking portions 62 e and 62 f and is inserted through the second shaft hole 54. At this time, the elastic pieces 62c and 62d are elastically displaced in directions close to each other so that the second support shaft 62a is inserted into the second shaft hole 54, and when the locking portions 62e and 62f are inserted. , Elastic return. Thus, the locking portions 62e and 62f are locked to the bottom surface of the recess 54a around the second shaft hole 54. The concave portion 54a is configured such that the entire thickness of the disk cartridge 1 is reduced by positioning the locking portions 62e and 62f. As described above, the second support shaft 62a is securely locked to the second shaft hole 54 by the locking portions 62e and 62f, and does not come off from the second shaft hole 54 even by an impact such as dropping. ing. The number of elastic pieces 62c, 62d is not limited to two, and may be three or more.

  When the second support shaft 62a is formed of a resin material, the above-described locking portions 62e and 62f are formed by melting the tip portions of the elastic pieces 62c and 62d with ultrasonic waves or heat. May be. Further, the second support shaft 62a is formed without providing the slit 62b, that is, without being divided, and after being inserted into the second shaft hole 54, the distal end portion is melted and locked by ultrasonic waves or heat. A part may be provided. In the above example, the case where the second support shaft 62a is provided on the second shutter plate 5b side and the second shaft hole 54 is provided on the first shutter plate 5a side has been described. The second shaft hole 54 may be provided on the shutter plate 5b side, and the second support shaft 62a may be provided on the first shutter plate 5a side.

  Further, as shown in FIG. 12, the second support shaft 62 a is provided on a pedestal portion 62 g provided integrally with the second rotation support portion 62. The pedestal portion 62g is a reinforcing portion that reinforces the portion where the second support shaft 62a is provided, and is formed thicker than other portions. The pedestal portion 62g is formed on the rotation wheel 4 side so as to be thicker than other regions. Therefore, the rotation wheel 4 is formed with a clearance groove 46 for escaping the pedestal portion 62g. Further, as shown in FIG. 5, a concave portion 63e is formed on the inner surface of the lower shell 7 so as to escape the tip portion of the second support shaft 62a.

  As shown in FIGS. 8 and 13, the second shutter portion 61 includes a first cam portion configured by a through groove with which the first control protrusion 63 formed on the rotation wheel 4 is engaged. 64 is formed. 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 first action portion 64a on the side away from the second support shaft 62a, which is a rotation fulcrum of the second shutter plate 5b, and a second side closer to the second support shaft 62a. 1 action part 64a and the 1st non-action part 64b which continued. The continuous first action part 64a is bent in the first direction, and the first non-action part 64b is bent in the second direction, and the first action part 64a and the first non-action part 64b are Are formed by through grooves curved in opposite directions. The first action portion 64a on the side away from the second support shaft 62a is the second shutter plate in the first half when the second shutter plate 5b opens the first and second openings 24 and 44. The second shutter plate 5b has the first and second non-acting parts 64b that act when the 5b is rotated and are continuous with the first acting part 64a on the side close to the second support shaft 62a. In the latter half when the openings 24 and 44 are opened, no action is performed.

  In addition, the 1st action part 64a can be formed by making it differ from the locus | trajectory of the 1st control protrusion 63 at the time of rotation of the rotation wheel 4, and the 1st non-action part 64b is 1st control. It can be formed by making it coincide with the locus of the protrusion 63 or forming it wide and making the first control protrusion 63 and the groove non-contact.

  As shown in FIG. 13, the first control protrusion 63 is reliably disposed on the rotation wheel 4 by the third drop-off prevention mechanism 63a. The first control protrusion 63 of the rotation wheel 4 serving as the third drop-off prevention mechanism 63a is formed with a retaining portion 63c that is formed to protrude from the tip portion of the shaft portion 63b. The retaining portion 63c is formed so as to protrude in a protruding shape instead of the entire circumference, thereby simplifying the molding die. On the other hand, the through groove constituting the first cam portion 64 is formed so that the shaft portion 63b can be inserted through the width thereof, and the thin portion 63d to which the retaining portion 63c is locked is formed on both sides thereof. Yes. The retaining portion 63c is reduced in thickness by engaging with the thin portion 63d. In addition, as shown in FIG. 5, the inner surface of the lower shell 7 is further formed with a concave portion 62h that serves as a relief of the retaining portion 63c.

  The third dropout prevention mechanism 63a may also be configured like the second dropout prevention mechanism 60 described above.

  Further, as shown in FIG. 8, the second shutter portion 61 has 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. Is formed. The second cam portion 65 includes a second non-acting portion 65a that is curved in the first direction on the center side of the rotation wheel 4 and a second direction opposite to the first direction on the outer peripheral side of the rotation wheel 4. The second action part 65b curved in the direction. The second cam portion 65 is formed with a bottomed groove so that foreign matter such as dust such as wear powder does not enter the rotation wheel 4 in which the optical disc 3 is accommodated. The second non-acting portion 65a does not act on the first half when the second shutter plate 5b opens the first and second openings 24 and 44, and the second acting portion 65b The second shutter plate 5b acts in the latter half when the first and second openings 24 and 44 are opened. Therefore, the second non-acting portion 65a does not act on the first half when the second shutter plate 5b opens the first and second openings 24 and 44, and the second control projection 66 When moving from the second non-acting portion 65a to the second acting portion 65b, that is, in the latter half of the rotation of the second shutter plate 5b, the second acting portion 65b is connected to the first cam portion 64 described above. Instead of the first action part 64a, the second 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.

  The second non-acting portion 65a is formed so as to coincide with the trajectory of the second control protrusion 66 when the rotation wheel 4 is rotated, or is formed wide so that the second control protrusion 66 and the groove are not in contact with each other. The second action portion 65b can be formed by making it different from the locus of the second control protrusion 66.

  By the way, as shown in FIGS. 8 and 13, the first cam portion 64 to which the first control projection 63 formed on the rotation wheel 4 is engaged is the pivot point of the second shutter plate 5b. The third non-acting part 64c is formed on the side away from the second support shaft 62a and on the upper side of the first acting part 64a, that is, on the side opposite to the first non-acting part 64b. . In the third non-acting portion 64c, the first control protrusion 63 is located when the second shutter plate 5a is in a position to close the first and second openings 24 and 44. When the rotation wheel 4 starts to rotate in the direction in which the second shutter plate 5b opens the first and second openings 24 and 44, the third non-acting portion 64c It is formed so as to be coincident with the trajectory or wide. Therefore, when the first control protrusion 63 is in the third non-acting portion 64c, only the rotation wheel 4 is rotated and the second shutter plate 5b is not rotated. And the engagement state of the 1st protrusion 59a formed in the vicinity of the 2nd opening part 44 of the rotation wheel 4 and the 4th recessed part 58e of the 2nd shutter board 5b is only cancelled | released. At this time, the third non-acting portion 64c fulfills a posture control function for preventing the second shutter plate 5b from flapping. Next, when the first control protrusion 63 moves to the first action part 64a next to the third non-action part 64c, the rotation of the second shutter plate 5b starts. After this, the first control protrusion 63 moves to the first non-acting portion 64b.

  As described above, when the disk cartridge 1 is loaded in the recording and / or reproducing apparatus and starts rotating, the driving force of the shutter opening mechanism on the recording and / or reproducing apparatus side is against the biasing member 48. The driving force for rotating the rotation wheel 4 and the engagement state of the first protrusion 59a formed in the vicinity of the second opening 44 of the rotation wheel 4 and the fourth recess 58e of the second shutter plate 5b. Therefore, the driving force for releasing is not required, and the driving force for rotating the second shutter plate 5b is not required. Therefore, the driving force as a whole can be reduced. When the first control protrusion 63 moves to the first action part 64a and the first non-action part 64b, the driving force for turning the rotation wheel 4 against the urging member 48 and the first and first action parts. It is only necessary to drive the second shutter plates 5a and 5b to rotate, and the first protrusion 59a and the second protrusion formed in the vicinity of the second opening 44 of the rotation wheel 4. The driving force for releasing the engagement state of the fourth recess 58e of the shutter plate 5b is not necessary, and the entire driving force of the shutter opening mechanism can be reduced. In the second shutter plate 5b, when the first control projection 63 is located on the first non-operation portion 64b, the second control projection 66 is rotated by the second operation portion 65b of the second cam portion 65. Will be moved.

  A fourth non-acting portion 65c is further formed on the lower side of the second acting portion 65b of the second cam portion 65, that is, on the opposite side of the second non-acting portion 65a. The fourth non-acting portion 65c is a portion where the second control projection 66 is located last when the second shutter plate 5b opens the first and second openings 24 and 44. The fourth non-acting portion 65c is the last portion where the rotation wheel 4 has opened the first and second opening portions 24, 44 by the first and second shutter plates 5a, 5b, and the second control protrusion. It is formed so as to coincide with the trajectory 66 or to be wide. Therefore, when the second control protrusion 66 moves from the second action portion 65b and is in the fourth non-action portion 65c, the rotation wheel 4 rotates and the second shutter plates 5a and 5b do not rotate. . The fourth non-acting portion 65c is formed to absorb an error in the rotation amount of the rotation wheel 4. When the second control protrusion 66 is in the fourth non-acting portion 65c, the rotation wheel 4 rotates. The second shutter plate 5b does not rotate.

  Here, regarding the rotation of the rotation wheel 4 and the rotation of the second shutter plates 5a and 5b, the relationship between the first and second control protrusions 63 and 66 and the first and second cam portions 64 and 65 is summarized. I will explain. First, when the disk cartridge 1 is not used, that is, when the second shutter plate 5b is in a position to close the first and second openings 24 and 44, the first control protrusion 63 is the first cam portion. 64, when the rotation wheel 4 starts to rotate, the third non-operating part 64c moves to the first operating part 64a, and the second shutter plate 5b rotates. Start. At this time, the second control protrusion 66 is positioned on the second non-acting portion 65a of the second cam portion 65, and nothing is acting.

  Further, when the rotation wheel 4 rotates, the first control protrusion 63 moves from the first action part 64a of the first cam part 64 to the first non-action part 64b. Then, the second control protrusion 66 moves from the second non-acting portion 65a of the second cam portion 65 to the second acting portion 65b. In other words, the second shutter plate 5 b has the second action of the second cam portion 65 instead of the first control protrusion 63 engaged with the first non-action portion 64 b of the first cam portion 64. The second control protrusion 66 engaged with the portion 65b is rotated.

  Finally, the second control protrusion 66 moves from the second action part 65b of the second cam part 65 to the fourth non-action part 65c. At this time, the first control protrusion 63 is still located at the first non-acting portion 64 b of the first cam portion 64. Thus, the opening operation of the first and second openings 24 and 44 by the second shutter plates 5a and 5b is completed.

  A method for assembling the disk cartridge 1 configured as described above will be described. First, in order to assemble the disk cartridge 1, first, as shown in FIG. 12, the second support shaft 62a of the second shutter plate 5b is attached to the second shaft hole 54 of the first shutter plate 5a. The first shutter plate 5a and the second shutter plate 5b are combined in a state where the second drop-off prevention mechanism 60 prevents the drop-off. That is, the second shutter 62a is inserted into the second shaft hole 54, and the locking portions 62e and 62f are locked to the bottom surface of the recess 54a around the second shaft hole 54, thereby the first shutter. The plate 5a and the second shutter plate 5b are combined.

  Next, the combined first and second shutter plates 5 a and 5 b are disposed on the rotation wheel 4. That is, the first and second shutter plates 5a and 5b are configured to engage the drop-off prevention protrusions 32 constituting the first drop-off prevention mechanism 31 of the first shutter plate 5a with the drop-off prevention grooves 33 of the rotation wheel 4, Further, the first control protrusion 63a of the rotation wheel 4 in which the third drop-off prevention mechanism 63a is configured is engaged with the retaining portion 63c in the groove of the first cam portion 64 of the second shutter plate 5b. The drive projection 51i of the first shutter plate 5a is engaged with the drive groove 49 of the rotation wheel 4, and the second control projection 66 of the second shutter plate 5a is engaged with the second shutter plate 5b. By being engaged with the cam portion 65, the cam portion 65 is disposed on the rotation wheel 4.

  When the first and second shutter plates 5 a and 5 b are arranged on the rotation wheel 4, then, as shown in FIG. 9, the urging member 48 has one end formed on the ring portion 43 of the rotation wheel 4. 48a, and the other end is attached by engaging with a locking projection 48b formed in the vicinity of the first shaft hole 53a of the first rotation support portion 53 of the first shutter plate 5a. When the urging member 48 is stretched over the rotation wheel 4 and the first shutter plate 5a, the rotation wheel 4 to which the first and second shutter plates 5a and 5b and the urging member 48 are attached then becomes the upper shell. The first support shaft 52 formed on the inner surface of the first shutter plate 5a is inserted into the first shaft hole 53a of the first shutter plate 5a and can be rotated to the upper shell 6 with the operated portion 45 facing the front surface. It is arranged. At this time, the rotation wheel 4 is attached to the upper shell 6 with the urging member 48 hung between the first shutter plate 5 a and the rotation wheel 4, so that the rotation wheel 4 is arranged on the upper shell 6. As compared with the case where the urging member 48 is hung between the first shutter plate 5a and the rotation wheel 4 after the installation, the assembling work can be easily performed.

  Thereafter, the disk cartridge 1 is completed by combining the lower shell 7 with the upper shell 6 on which the rotation wheel 4 and the first and second shutter plates 5 a and 5 b are arranged and coupling them with screws 23.

  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 first and second shutter plates 5a and 5b closes the first and second openings 24 and 44, the rotation wheel 4 in FIG. The operated portion 45 is in a state of being urged to rotate in the direction of the arrow D. The operated portion 45 is located on one side edge of the first opening 24 and the first opening 24 of the lower shell 7 and the rotation wheel 4 The position of the second opening 44 is inconsistent. As shown in FIG. 2, the engagement groove 45c of the operated portion 45 prevents the first shutter plate 5a from being lifted or lowered by engaging the first shutter plate 5a. Further, as shown in FIG. 8, 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. The tapered portion of the third side edge portion 51c of the shutter portion 51 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. In other words, the disc cartridge 1 has the first and second shutter plates 5a and 5b meshed with each other so as not to be bent and deformed, and the first shutter plate 5a is prevented from being lifted. In order to prevent foreign matter such as dust from entering the battery. Further, the first to fourth recesses 58a to 58e and the first to third protrusions 59a to 59c are engaged with each other so that dust or the like does not enter inside from the coupling portion.

  At this time, as shown in FIG. 14, the drive protrusion 51i of the first shutter plate 5a is located at the first non-acting portion 49a at one end of the drive groove 49 of the rotation wheel 4, and the first shutter plate 5a. Is in a position to close the first and second openings 24, 44. Further, in the first cam portion 64 of the second shutter plate 5b, the first control projection 63 is engaged with the third non-operation portion 64c, and the second control projection 66 of the second shutter plate 5b. Is engaged with the second non-acting portion 65a of the second cam portion 65 of the rotation wheel 4, and the second shutter plate 5b is connected to the first opening 24 of the lower shell 7 as shown in FIG. Is closed.

  Further, the guide projection 51 g and the regulation projection 51 h of the first shutter plate 5 a are located in the second opening 44. The guide projection 51g and the regulation projection 51h of the first shutter plate 5a are located corresponding to the inner peripheral non-signal recording area around the center hole 3a of the optical disc 3 accommodated in the rotation wheel 4. . Therefore, even when the first shutter plate 5a is pushed, the guide projection 51g and the regulation projection 51h of the first shutter plate 5a hit the inner peripheral non-signal recording area of the optical disc 3, and Since one shutter portion 51 does not contact the signal recording area of the optical disc 3, it is possible to prevent the signal recording area from being damaged.

  When the disc cartridge 1 is not used as described above, the disc cartridge 1 may be accidentally dropped when the user inserts it into the recording and / or reproducing apparatus or carries it. That is, the disk cartridge 1 often receives a large impact when not in use. In view of this, in the disk cartridge 1, the first drop prevention mechanism 31 is provided to prevent the first shutter plate 5a from dropping from the rotation wheel 4. That is, when the disk cartridge 1 is not used, the drop-off prevention protrusion 32 is formed when the first and second shutter plates 5a and 5b close the first and second openings 24 and 44. 33 so that the first shutter plate 5a does not fall off from the main surface of the rotation wheel 4.

  Further, the disc cartridge 1 is provided with a second drop prevention mechanism 60 for dropping the second shutter plate 5b from the first shutter plate 5a. That is, the second shutter plate 5b attached to the first shutter plate 5a, which is prevented from dropping from the rotation wheel 4 by the first drop-off preventing mechanism 31, is the second shaft hole 54 of the first shutter plate 5a. By locking the locking portions 62e and 62f of the second support shaft 62a of the second shutter plate 5b, the falling off from the first shutter plate 5a is prevented.

  Further, in the disk cartridge 1, the second shutter plate 5b is prevented from dropping from the rotation wheel 4 by the third drop prevention mechanism 63a. In other words, the first control protrusion 63 formed on the rotation wheel 4 is such that the retaining portion 63 c formed at the tip portion is engaged with the thin portion 63 d of the through groove constituting the first cam portion 64. This prevents the second shutter plate 5b from falling off the rotation wheel 4.

  As described above, in the disk cartridge 1, the first shutter plate 5 b is prevented from dropping from the rotation wheel 4 by the first drop prevention mechanism 31, and the second shutter plate 5 b is the second drop prevention mechanism 60. Is prevented from falling off from the second shutter plate 5b, and the third dropping prevention mechanism 63a is prevented from dropping from the rotation wheel 4 of the second shutter plate 5b. Can be prevented from falling off the first and second shutter plates 5a, 5b from above the rotation wheel 4, the rotation wheel 4 can no longer rotate, and the first and second It is possible to prevent a failure such that the shutter plates 5a and 5b do not rotate.

  Further, when the disk cartridge 1 is not in use, the thin portion 37 at the tip of the first shutter plate 5a is engaged with the displacement restricting projection 36 of the lower shell 7, so that a large impact is applied to the cartridge body 2. Even if it happens, flapping can be prevented. Therefore, for example, the tip of the first shutter plate 5a flutters due to an impact and enters the rotation wheel 4 from the second opening 44 of the rotation wheel 4, and damages the stored optical disk 3; It is possible to prevent the first shutter plate from rotating. Since the displacement restricting protrusion 36 is integrally formed with the lower shell 7, secondary processing for forming the displacement restricting protrusion 36 is not required, and the manufacturing process can be simplified.

  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 formed on the mounting portion of the recording and / or reproducing apparatus are inserted into the insertion guide grooves 25a and 25b. Then, when the disc cartridge 1 is guided by the insertion guide pin and mounted in the mounting portion of the recording and / or reproducing apparatus, the positioning pin of the mounting portion engages with the location hole 26a and the alignment hole 26b, thereby The recording and / or reproducing apparatus is mounted in a state where it is accurately positioned. A shutter release pin 41 constituting a shutter release mechanism on the recording and / or reproducing apparatus side is engaged with the operated portion 45 of the rotation wheel 4. Then, the rotation wheel 4 is rotated in the direction of arrow A in FIG. 14 by the shutter opening pin 41 on the recording and / or reproducing apparatus side engaged with the operated portion 45 of the rotation wheel 4. The rotation wheel 4 is rotated in the direction of the arrow A in FIG. 14 against the urging force of the urging member 48 by the shutter opening pin 41.

  At the start of the rotation wheel 4, the first shutter plate 5 a has a drive protrusion 51 i formed on the first shutter portion 51 in the first non-acting portion 49 a of the drive groove 49 formed on the rotation wheel 4. Is moved toward the action portion 49b, so that it does not rotate. At the start of the rotation wheel 4, the second shutter plate 5 b has a first control protrusion 63 formed on the rotation wheel 4 in the first non-acting portion 64 c of the first cam portion 64. The second control projection 66 of the second shutter plate 5b moves in the second non-action portion 65a of the second cam portion 65 toward the second action portion 65b. Therefore, it does not rotate. That is, when the rotation of the rotation wheel 4 starts, only the rotation wheel 4 rotates in the direction opposite to the arrow A in FIG. 14, and the first and second shutter plates 5a and 5b do not rotate. By rotating only the rotation wheel 4, the first protrusion 59a formed in the vicinity of the second opening 44 of the rotation wheel 4 and the first recess 58a and second of the first shutter plate 5a. The engagement state of the fourth recess 58e of the shutter plate 5b is released. At the start of rotation of the rotation wheel 4, the driving force of the shutter opening mechanism on the recording and / or reproducing apparatus side is the driving force for rotating the rotation wheel 4 against the biasing member 48 and the second of the rotation wheel 4. The engagement state of the first protrusion 59a formed in the vicinity of the first opening 44, the first recess 58a of the first shutter plate 5a, and the fourth recess 58e of the second shutter plate 5b is released. Therefore, the driving force for rotating the first and second shutter plates 5a and 5b is not required, so that the driving force as a whole can be reduced.

  Further, when the rotation wheel 4 is rotated in a direction opposite to the arrow A in FIG. 14, the first shutter plate 5 a has the drive protrusion 51 i formed on the first shutter portion 51 formed on the rotation wheel 4. By moving from the first non-acting portion 49a of the drive groove 49 to the acting portion 49b, rotation starts in the direction of arrow B in FIG. 14 about the first support shaft 52 of the upper shell 6. Along with the rotation of the first shutter plate 5 a, the second shutter plate 5 b has a first control protrusion 63 formed on the rotation wheel 4 from the third non-acting portion 64 c of the first cam portion 64. It moves to the 1st action part 64a, and the 2nd control projection 66 of the 2nd shutter board 5b moves in the 2nd non-action part 65a of the 2nd cam part 65 toward the 2nd action part 65b. As a result, rotation starts in the direction of arrow C in FIG. 14 about the second support shaft 62a attached to the second shaft hole 54 of the first shutter plate 5a. That is, since the second control protrusion 66 of the second shutter plate 5b is only moved within the second non-acting portion 65a of the second cam portion 65, the second shutter plate 5b is rotated. No action is taken against the movement, and the second shutter plate 5b rotates when the first control protrusion 63 of the rotation wheel 4 moves the first action portion 64a of the first cam portion 64. Moved.

  Further, when the rotation wheel 4 is rotated in the direction of the arrow A in FIG. 14, the drive protrusion 51 i formed on the first shutter portion 51 is formed on the drive groove formed on the rotation wheel 4 as shown in FIG. 15. By moving in the action part 49b of 49, it rotates in the direction of arrow B in FIG. 14 around the first support shaft 52 of the shell 6. Further, as the first shutter plate 5 a rotates, the second shutter plate 5 b has a first control protrusion 63 formed on the rotation wheel 4 so that the first action portion 64 a of the first cam portion 64. To the first non-acting portion 64b, and the second control projection 66 of the second shutter plate 5b moves from the second non-acting portion 65a of the second cam portion 65 to the second acting portion 65b. As a result, the second support shaft 62a attached to the second shaft hole 54 of the first shutter plate 5a is continuously rotated in the direction of arrow C in FIG. That is, the second shutter plate 5b has a second control protrusion 66 of the second shutter plate 5b in the second action portion 65b of the second cam portion 65 in the latter half portion after the time shown in FIG. The first control protrusion 63 of the rotation wheel 4 that has been rotated by moving and that has been operated so far does not work by moving from the first action part 64a to the first non-action part 64b. The control projection for rotating the second shutter plate 5b with the state shown in FIG. 15 as a boundary is the first control projection 63 engaged with the first action portion 64a of the first cam portion 64. To the second control projection 66 engaged with the second action portion 65b of the second cam portion 65.

  Further, when the rotation wheel 4 rotates in the direction of the opposite arrow A in FIG. 14, the positions of the first opening 24 of the lower shell 7 and the second opening 44 of the rotation wheel 4 coincide as shown in FIG. It will be in the state. At this time, the drive protrusion 51i formed on the first shutter portion 51 moves within the action portion 49b of the drive groove 49 formed on the rotation wheel 4, and further moves to the second non-action portion 49c. Thus, the first shutter plate 5a is rotated about the first support shaft 52 of the shell 6 in the direction of arrow B in FIG. 16, and the first and second openings 24, 44 are opened. And Further, as the first shutter plate 5 a rotates, the second shutter plate 5 b has a first control protrusion 63 formed on the rotation wheel 4 so that the first non-working portion of the first cam portion 64. 64b moves to the end, the second control projection 66 of the second shutter plate 5b moves in the second action part 65b of the second cam part 65, and further the fourth non-action part 65c. 16, the second support shaft 62a attached to the second shaft hole 54 of the first shutter plate 5a is continuously rotated in the direction of arrow C in FIG. 16, as shown in FIG. In addition, the first and second openings 24 and 44 are opened.

  The first shutter plate 5a is fully opened when the drive protrusion 51i is moved from the action portion 49b of the drive groove 49 to the second non-action portion 49c, and the second shutter plate 5b is the second control protrusion. 66 is fully opened when the second operating portion 65b of the second cam portion 65 shifts to the fourth non-operating portion 65c. On the other hand, the rotation wheel 4 slightly rotates in the direction opposite to the arrow A in FIG. 16. At this time, the first shutter plate 5 a has the drive protrusion 51 i as the second non-acting portion 49 c of the drive groove 49. The second shutter plate 5b moves in the fourth non-acting portion 65c of the second cam portion 65, so that the second shutter plate 5b moves to the first and second shutter plates 5a. , 5b will not rotate. The rotation of only the rotation wheel 4 in this final stage is for absorbing errors in the rotation amount of the rotation wheel 4.

  In addition, as shown in FIG. 16, the second shutter plate 5b is a first portion that approaches the second support shaft 62a that is the rotation fulcrum of the second shutter plate 5b in the latter half of the rotation operation. By avoiding the use of the control projection 63 and engaging the second control projection 66 that is separated from the second support shaft 62a with the second action portion 65b of the second cam portion 65, a weak driving force can be used. It can be turned. That is, as shown in FIG. 16, the first position of the first cam portion 64 located on the first non-acting portion 64b from the second support shaft 62a, which is the rotation fulcrum of the second shutter plate 5b. The distance L2 to the second control protrusion 66 located in the second action part 65b or the fourth non-action part 65c of the second cam part 65 is longer than the distance L1 to the control protrusion 63. Thus, the second shutter plate 5b can be rotated with a weak driving force. Further, the disk cartridge 1 divides the working portion into a first half portion and a second half portion when the first and second shutter plates 5a and 5b are rotated, that is, the first working portion 64a of the first cam portion 64 and the first working portion 64a. The second action portion 65b of the second cam portion 65 is used to prevent generation of dust such as wear powder in the cartridge body 2 due to the rotation of the first and second shutter plates 5a and 5b. Can do.

  Further, after the state shown in FIG. 15, the drop-off prevention protrusion 32 of the first drop-off prevention mechanism 31 is provided with a drop-off prevention groove of the rotation wheel 4 along with the rotation of the rotation wheel 4 and the rotation of the first shutter plate 5a. 33 is removed from the storage space of the optical disc 3. In the series of processes in which the rotation wheel 4 rotates and the first and second shutter plates 5a and 5b rotate, the urging member 48 extends as the rotation wheel 4 rotates. The stopper piece 34 formed on the ring portion 43 of the rotation wheel 4 is restricted from moving out, and the drop-off prevention protrusion 32 can be smoothly retracted from the drop-off prevention groove 33.

  The optical disk 3 rotatably accommodated in the rotation wheel 4 is provided in the upper shell 6 with the center hole 3a engaged with the disk table of the disk rotation driving mechanism on the recording and / or reproducing apparatus side. It is clamped by the clamping plate 13 and the disk table, and can be rotated 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.

  Note that when the disc cartridge 1 is ejected from the recording and / or reproducing apparatus, the rotation wheel 4 causes the urging force of the urging member 48 to release the shutter release pin 41 from the operated portion 45, so that the arrow A in FIG. , And returns to the state of FIG. 14 through the state of FIG. In the series of processes in which the rotation wheel 4 rotates in the direction of arrow A in FIG. 16, the drive protrusion 51i of the first shutter plate 5a is moved from the second non-operation part 49c to the action part 49b of the drive groove 49 of the rotation wheel 4. The first shutter plate 5a is rotated in the direction of the arrow B in FIGS. 14 to 16 to close the first and second openings 24 and 44. Put it in a state. Further, the first control protrusion 63 of the rotation wheel 4 for rotating the second shutter plate 5b is changed from the first non-acting part 64b of the first cam part 64 through the first acting part 64a. The second control protrusion 66 of the second shutter plate 5b moves from the fourth non-action part 65c to the second non-action part 65a via the second action part 65b. To do. Accordingly, the second shutter plate 5b rotates in the direction opposite to the arrow C in FIGS. 14 to 16, and closes the first and second openings 24 and 44.

  As shown in FIG. 15, the first shutter plate 5 a rotates in the direction opposite to the arrow B in FIG. 15, so that the thin-walled portion 37 at the tip is the displacement restricting projection 36 of the lower shell 7 and the main surface portion of the lower shell 7. Engage between. When the thin portion 37 at the tip of the first shutter plate 5 a enters the displacement restricting projection 36, the first shutter plate 5 a is lifted to the lower shell 7 side by the lifter 38 of the rotation wheel 4. Can be smoothly engaged between the displacement restricting projection 36 and the main surface portion of the lower shell 7. Further, the urging member 48 contracts at this time, but is prevented from being violated by the stopper piece 34 formed on the ring portion 43 of the rotation wheel 4, and the drop-off prevention protrusion 32 smoothly enters the drop-off prevention groove 33. be able to. Further, as shown in FIG. 15, the drop-off prevention protrusion 32 of the first shutter plate 5a enters the drop-off prevention groove 33 when the first shutter plate 5a rotates in the direction opposite to the arrow B in FIG. . At this time, the first shutter plate 5 a is lifted by the lifter 35 of the lower shell 7, whereby the drop prevention protrusion 32 can smoothly enter the drop prevention groove 33 of the rotation wheel 4.

  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 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 disassembled perspective view which shows a shutter board and a rotation wheel. FIG. 6 is a perspective view showing a state in which the first and second shutter plates are assembled on the rotation wheel and the first and second shutter plates are in the closed position. It is principal part sectional drawing of a 1st drop-off prevention mechanism. It is the perspective view which looked at the state which the 1st and 2nd shutter board was assembled | attached to the lower shell, and closed the 1st opening part from the inner side of the lower shell. It is a principal part exploded perspective view which shows the relationship between a 1st shutter board and a 2nd shutter board. It is a principal part perspective view which shows the 2nd and 3rd drop-off prevention mechanism. It is the top view which showed the state which the 1st and 2nd shutter board obstruct | occluded the 1st and 2nd opening part except the upper shell and the optical disk. It is the top view which showed the middle stage which the 1st and 2nd shutter board open | releases the 1st and 2nd opening part in the state except the upper shell and the optical disk. It is the top view which showed the state which the 1st and 2nd shutter board open | released the 1st and 2nd opening part in the state except the upper shell and the optical disk. It is a perspective view of a disc cartridge showing a state where a first opening is opened.

Explanation of symbols

1 disk cartridge, 2 cartridge body, 3 optical disk, 4 rotation wheel, 5a first shutter plate, 5b second shutter plate, 6 upper shell, 7 lower shell, 8 outer peripheral wall, 11 inner peripheral wall, 13 clamping plate, 21 Outer wall, 24 First opening, 28 Inner wall, 31 First drop prevention mechanism, 32 Drop prevention protrusion, 32a Projection piece, 32b Shaft part, 32c Fall prevention part, 33 Fall prevention groove, 33a Thin wall part, 33b End face, 34 Stopper piece, 35 Lifter, 35a Taper part, 36 Displacement restricting projection, 37 Thin part, 38 Lifter, 41 Shutter release pin, 42 Taper part, 43 Ring part, 44 Second opening part, 45 Operated part 48 biasing member 49 drive groove 49a first non-acting part 49b acting part 49c second non-acting Part, 51 first shutter part, 51g guide protrusion, 51h regulating protrusion, 51i driving protrusion, 52 first support shaft, 53 first rotation support part, 53a first shaft hole, 54 second shaft hole , 54a recess, 60 second drop-off prevention mechanism, 61 second shutter portion, 62 rotation support portion, 62a second support shaft, 62b slit, 62c, 62d elastic piece, 62e, 62f locking portion, 63 first 1 control projection, 63a third drop prevention mechanism, 63b shaft portion, 63c retaining portion, 63d thin portion, 64 first cam portion, 64a first action portion, 64b first non-action portion, 64c first 3 non-acting part, 65 second cam part, 65a second non-acting part, 65b second acting part, 65c fourth non-acting part, 66 second control protrusion

Claims (4)

A cartridge body comprising a lower shell in which a first opening for recording and / or reproduction is formed, and an upper shell attached to the lower shell;
A rotation wheel in which a second opening corresponding to the first opening for accommodating the disc and storing the disc in a rotatable manner in the cartridge body and facing the outside is formed;
Located between the lower shell and the rotation wheel, and when the first opening and the second opening coincide with the rotation of the rotation wheel, the first opening and the A shutter mechanism having at least one shutter plate that opens the second opening,
The lower shell is formed with a displacement restricting projection for restricting the displacement of the front end side of the shutter plate. When the shutter plate closes the first and second openings, the main surface portion of the lower shell A disc cartridge that is engaged between the projection and the displacement regulating projection.   2. The disk cartridge according to claim 1, wherein the shutter plate has a thin-walled tip portion.   2. The disc cartridge according to claim 1, wherein the displacement restricting protrusion is formed integrally with the lower shell.   2. The disk cartridge according to claim 1, wherein the rotation wheel is formed with a lifter for lifting the shutter plate in the direction of the lower shell when the first and second openings are closed.

Images