JP4100402B2 - Disc cartridge - Google Patents

Description

  The present invention relates to a disk cartridge that prevents generation of dust and the like accompanying movement of a shutter plate and prevents entry of dust and the like into a cartridge body.

  There is a disk cartridge as described in Patent Document 1 below. In the disk cartridge of Patent Document 1, a recording / reproducing opening of the cartridge body is closed by a pair of shutter plates. However, when the pair of shutter plates closing the opening of the cartridge body is forcibly pushed, a gap is generated between the shutter plate and the peripheral edge of the first opening of the cartridge body. When a gap occurs, dust or the like enters the cartridge body from this gap, and when dust or the like adheres to the disc stored inside, the information signal is recorded accurately, or the recorded information signal is not recorded. It becomes impossible to read.

  Further, when providing a small disk cartridge using a small optical disk having the same recording format as that of the disk used in the disk cartridge, the size cannot be simply reduced. This is because when a recording and / or reproducing apparatus is loaded, the recording / reproducing opening or the like into which the optical pickup enters cannot be reduced for compatibility, and recording / reproducing of a standard size disc cartridge is possible. Must be the same size as the opening. Therefore, in a small disk cartridge, the proportion of the entire opening is large and the strength is weakened.

  For example, if the cartridge main body is easily bent due to a decrease in strength, a gap is more likely to be generated between the shutter member and the cartridge main body, and dust and the like are likely to enter the inside. Further, dust or the like is generated with the movement of the shutter member. If dust or the like adheres to the disc, it is impossible to accurately record an information signal on the disc or read the recorded information signal.

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 prevent generation of dust and the like accompanying movement of the shutter, and prevent dust and the like from entering the cartridge body. To provide a cartridge.

A disc cartridge according to the present invention includes a cartridge main body comprising a lower shell having a first opening for recording and / or reproduction, and an upper shell attached to the lower shell, and rotates into the cartridge main body. A rotation wheel in which a second opening corresponding to the first opening for accommodating the disc and storing the disc and facing the outside is formed, and the lower shell and the rotation wheel. A pair of first and second shutter plates that are located between and rotate in conjunction with the rotation of the rotation wheel, and the first opening and the second shutter plate according to 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 each other. 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. The second shutter plate is formed with a first cam portion in which a first non-action portion is formed after the first action portion, and is formed on the rotation wheel on the first cam portion. The first control protrusion is engaged, and a second control protrusion is formed. The second control protrusion is a second action next to the second non-acting part formed on the rotation wheel. The portion is engaged with the second cam portion formed. When the shutter mechanism performs an operation of opening the first opening and the second opening, the rotation of the rotation wheel causes the second shutter plate to first move to the first shutter. And the second control projection is rotated by moving the second non-action portion, and then the second control projection is moved to the second action portion. And the first control projection is rotated by moving the first non-acting part.

According to the present invention, in the second shutter plate, first, the first control projection moves the first action portion, and the second control projection moves the second non-action portion. Then, the second control protrusion is moved by moving the second action part, and the first control protrusion is turned by moving the first non-action part. In other words, in the first half of opening the first and second openings, the second shutter plate constitutes the first cam portion of the second shutter plate engaged with the first control protrusion of the rotation wheel. The second acting portion is rotated by the first acting portion, and in the second half portion, in place of the first acting portion, the second cam portion of the rotation wheel engaged with the second control protrusion of the second shutter plate is configured. It is rotated by two action parts. Thus, since the action part for rotating the second shutter plate is divided into two parts, the generation of dust and the like accompanying the rotation of the shutter plate from each action part is prevented, and the dust inside the cartridge main body is prevented. And the like can be prevented from entering.

  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 disc cartridge to which the present invention is applied is smaller in size than the disc cartridge disclosed in Patent Document 1 and uses a small-diameter optical disc. Therefore, the recording capacity is smaller than that of a standard size disc 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.

  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 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. As shown in FIG. 7, the insertion guide grooves 25 a and 25 b are formed so that the front opening end side is the widest and the insertion guide pin 100 is easy to enter. In addition, you may form so that the innermost part of insertion guide groove 25a, 25b may become substantially the same as the thickness of the insertion guide pin 100. FIG. Thereby, even when the disc cartridge 1 is mounted on the mounting portion of the recording and / or reproducing apparatus, positioning in the surface direction can be achieved, and rattling can be prevented. As will be described later, one insertion guide groove 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 engage the insertion guide groove 25b. The pin 100 functions as a lock release pin that presses the lock release piece 77.

  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 °.

  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, an operated object that protrudes outward and engages with a shutter opening pin 41 that constitutes a shutter opening mechanism on the recording and / or reproducing apparatus side. A 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 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 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 35 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 5c 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.

  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 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 mesh with each other, and each meshes in the opposite direction so that dust or the like enters inside from the coupling portion. 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.

  Note that the tip end portion of the support shaft 74 protrudes from the base portion 73 even when the lock member 72 is attached. And the front-end | tip part of the protruded spindle 74 is engaged with the bearing part 86 provided in the upper shell 6 side, and it prevents the lock member 72 from removing from the spindle 74 even if an impact, such as dropping, is applied. That is, the strength of the support shaft 74 is reinforced.

  As shown in FIG. 19, the lock member 72 has a locking portion 76 facing inward and an unlocking piece 77 in the insertion guide groove 25b, and through an escape hole 80 formed in a rising wall constituting the insertion guide groove 25b. It will come. 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.

  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 front surface side of the bottom surface of the insertion guide groove 25b is opened. The unlocking piece 77 faces the front opening end side further than the end face 87 of the bottom surface 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 can be pressed. . 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 the end face 87 of the bottom surface, which 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, when the width of the lock release pin 88 of the recording and / or reproducing apparatus is W1, and the width of the insertion guide groove 25b is W2, W1 ≧ W2 / 2. Accordingly, the insertion guide pin 100 can reliably press the lock release piece 77.

  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 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 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 front surface side of the bottom surface of the insertion guide groove 25b is opened. The unlocking piece 77 faces the front opening end side further than the end face 87 of the bottom surface 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 can be pressed. .

  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 disk cartridge 1 can be reliably guided to a predetermined position of the mounting portion. Further, when the width of the innermost part of the insertion guide grooves 25a and 25b is made substantially the same as the thickness of the insertion guide pin, the insertion guide pin 100 is used to insert the disk cartridge 1 into the mounting portion of the recording and / or reproducing apparatus. It can be accurately mounted at a predetermined position.

  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 on the mounting portion, the lock release pin that is the insertion guide pin 100 first presses the lock release piece 77 when entering the insertion guide groove 25b from the front side opening end, and then It strikes against the bottom end face 87. The lock release piece 77 is pressed by the lock release pin 88 until the lock release pin 88 hits the end surface 87. 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 rotates in the direction indicated by the arrow A in FIG. 17 against the biasing force of the biasing member 48 at the operated portion 45. Then, the first shutter plate 5a having the guide protrusion 51g engaged with the guide groove 55 of the rotation wheel 4 is centered on the first support shaft 52 of the upper shell 6 in the direction of arrow B in FIG. Rotate. 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 widened and narrowed portion 64a of the first cam portion 64, and in the latter half portion, the second control projection 66 and the second action portion of the second shutter plate 5b are formed. 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. Further, when the first control protrusion 63 is positioned and acting on the narrow portion 64 a of the first cam portion 64, or the second control protrusion 66 is formed on the second curved portion 65 b of the second cam portion 65. When positioned and acting, the control projections 63 and 66 are rotated at positions close to the rotation fulcrum because they are separated from the second support shaft 62a which is the rotation fulcrum of the second shutter plate 5b. The second shutter plate 5b can be rotated more stably than when performing dynamic control.

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

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

  When the disk cartridge 1 is ejected from the recording and / or reproducing device, the rotation wheel 4 is rotated in the direction of arrow D 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.

  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.

Explanation of symbols

1 disc cartridge, 2 cartridge main body, 3 optical disc, 4 rotation wheel, 5a, 5b shutter plate, 6 upper shell, 7 lower shell, 45 operated portion, 45a first operated piece, 45b second operated piece, 45c engagement groove, 50 engagement groove, 71 lock mechanism, 72 lock member, 73 base portion, 74 support shaft, 75 shaft hole, 76 lock portion, 77 lock release piece

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 is formed, the second opening corresponding to the first opening for accommodating the disk in a rotatable manner in the cartridge main body and accommodating the disk;
It is located between the lower shell and the rotation wheel, and has a pair of first and second shutter plates that rotate in conjunction with the rotation of the rotation wheel, and the rotation wheel rotates as described above. A shutter mechanism that opens the first opening and the second opening when the first opening and the second opening coincide with each other;
The first shutter plate is rotatably attached to the cartridge main body, and rotates with the rotation of the rotation wheel.
The second shutter plate is rotatably attached to the first shutter plate,
The second shutter plate is formed with a first cam portion in which a first non-action portion is formed after the first action portion, and a first cam portion formed on the rotation wheel is formed on the first cam portion. The first control protrusion is engaged, and a second control protrusion is formed. The second control protrusion is formed after the second non-operation portion formed on the rotation wheel. Engaged with the formed second cam portion,
When the shutter mechanism performs an operation of opening the first opening and the second opening, the rotation of the rotation wheel causes the second shutter plate to first move to the first shutter. And the second control projection is rotated by moving the second non-action portion, and then the second control projection is moved to the second action portion. The disk cartridge is characterized in that the first control projection is rotated by moving the first non-operation part . The first cam portion, the first at the working portion is the narrow portion, the disk cartridge according to claim 1 wherein said first non-acting portion is widened portion. In the second cam portion , the second non-action portion is a first bending portion, and the second action portion is a second bending portion whose bending direction is opposite to that of the first bending portion. claim 1 or claim 2 wherein the disc cartridge, characterized in that there.   The first shutter plate has a guide protrusion that engages with a guide groove formed in the rotation wheel.
  When the shutter mechanism performs an operation of opening the first opening and the second opening, the rotation wheel is rotated, so that the guide protrusion is formed on the first shutter plate. 4. The disk cartridge according to claim 1, wherein the disk cartridge is rotated by moving the guide groove.

Images