JP2005276334A - Disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a disk cartridge whose first and second shutters form a circular shape in the state for shutting a head opening part, and which prevents dust or the like from entering via an interval between a pair of protruded parts. <P>SOLUTION: In the disk cartridge 10, a head opening part 16 for permitting a head of a drive device to access a recording surface of a disk medium rotatably accommodated in a disk accommodation part 50 of a case 14 is provided. The head opening part 16 is shut by the abutment in which an end face of the first shutter 64 and an end face of the second shutter 74 abut against each other, and is opened by separating the end faces from each other. An arcuate first protruded part 68 provided on the first shutter 64 and an arcuate second protruded part 80 provided on the second shutter 74 form an annular disk inner circumference receiving part 90 against which the surface around the center hole of the disk medium abuts by making the circumferential end parts in the shut state of the head opening part 16 abut each other. The first protruded part 68 and the second protruded part 80 are formed into taper shapes respectively corresponding to the circumferential end parts 68A and 80A which abut against each other in the shut state of the head opening part 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disk cartridge in which a disk-shaped disk medium used as an information or video recording / reproducing medium is rotatably accommodated in a case.

  For example, disk-shaped disk media such as optical disks and magneto-optical disks are used as computer recording / reproducing media and video recording / reproducing media. When recording or reproducing such a disk medium, a laser beam is applied to the recording surface by a recording head that accesses the recording surface side of the disk medium while being rotated by a spindle shaft while being loaded in the disk drive device. Or both a laser beam and a magnetic field are irradiated. As a result, in the disk media, information is recorded by pit formation, phase change, magnetization reversal, etc. due to decomposition and / or temperature rise of the recording layer, or recording by reading the reflectance and polarization angle of the laser beam with a reproducing head. The reproduced information is reproduced.

  Accompanying the increase in recording capacity of such disc media, the disc media is accommodated in the case accommodating portion in order to prevent dust from adhering to the recording surface side surface (the cover layer covering the recording layer) of the disc media. Such a disc cartridge is known (see, for example, Patent Document 1). In such a disk cartridge, a center hole of the disk medium and a chucking opening and a head opening for accessing the recording surface side are provided on the recording surface side of the disk medium in the case. These openings are opened and closed by a pair of shutters driven by an inner rotor.

  In addition, there is known a disk cartridge provided with an opening that allows the disk medium to be taken in and out on the opposite side of the disk medium in the case from the chucking opening and the head opening (see, for example, Patent Document 2). . In this disk cartridge, the opening is provided, and a pair of shutters including the inner rotor are operated on the same plane, thereby reducing the thickness. This disk cartridge will be described with reference to FIG.

  14 includes a chucking opening 104 for accessing a center hole of a disk medium (not shown) in a bottom plate 102A of a case 102, and a head opening for a head of a drive device to access a recording surface. 106 are provided. Between the disk medium in the case 102 and the bottom plate 102A, there is a first shutter 108 supported so as to be rotatable coaxially with the disk medium, and a rotating shaft 112 on the radially outer side of the disk medium in the case 102. A second shutter 110 is provided.

  As shown in FIG. 14A, the first shutter 108 and the second shutter 110 abut against the abutting end faces 108A and 110A to close the head opening 106, and the chucking opening 104. Is always open. Then, the first shutter 108 is rotated in the direction of the arrow G and the second shutter 110 is rotated in the direction of the arrow H substantially opposite to the arrow G with respect to the head opening portion 106, as shown in FIG. As shown, the head opening 106 is opened.

  Further, convex portions 114 and 116 formed in an arc shape in a plan view project from the upper surface of the first shutter 108 and the upper surface of the second shutter 110, respectively. The pair of convex portions 114 and 116 form an annular shape that surrounds the chucking opening 104 in plan view as a whole, with the end portions in the circumferential direction abutting each other when the head opening 106 is closed. A surface around the center hole provided in the axial center portion of the disk medium 12 is brought into contact with the upper end surfaces of the annular convex portions 114 and 116. This prevents the recording surface of the disk medium 12 from coming into contact with the first shutter 108 and the second shutter 110, and allows dust and the like to enter the recording surface side of the disk medium via the chucking opening 104. Be blocked.

  By the way, in order to make the first shutter 108 and the second shutter 110 rotatable, necessary clearances are set between the case 102 and the rotation shaft 112, respectively, and the head opening 106 is closed. It is set as the structure which produces backlash.

However, in the conventional disk cartridge 100 described above, the contact portions 114A and 116A located in the head opening 106 are substantially line-contacted to form an annular shape when the head opening 106 is closed in the convex portions 114 and 116. Due to the configuration, there is a problem that a gap is generated between the contact portions 114A and 116A due to the play. This gap causes dust and the like to enter the recording surface side of the disk medium.
JP 2003-115184 A JP 2003-242740 A

  In consideration of the above facts, the present invention can prevent intrusion of dust and the like through a pair of convex portions that form an annular shape with the first shutter and the second shutter closing the head opening. The purpose is to obtain a cartridge.

  In order to achieve the above object, a disk cartridge according to a first aspect of the present invention includes a head of a drive device on a recording surface side of the disk medium in a housing portion that rotatably houses a disk-shaped disk medium. , A case provided with a head opening for accessing the recording surface, and the first shutter and the second shutter abut against each other to close the head opening, and the first shutter and the second shutter A shutter mechanism that separates an end portion from the shutter to open the head opening, an arc-shaped first convex portion provided on the first shutter, and an arc-shaped second convex provided on the second shutter Is formed in an annular shape by abutting the circumferential end in the closed state of the head opening, and is in contact with the surface around the center hole provided in the axial center of the disk medium. An inner circumferential receiving portion, and the first convex portion and the second convex portion are configured such that circumferential end portions that are abutted in a closed state of the head opening portion have a tapered shape corresponding to each other. It is a feature.

  In the disk cartridge according to claim 1, in the head opening for the head of the drive device to access the recording surface of the disk medium housed in the housing portion of the case, the first shutter and the second shutter abut against each other. Thus, the first shutter and the second shutter are opened by separating the end surfaces. In a state where the first shutter and the second shutter close the head opening, the first convex portion and the second convex portion are formed in an annular shape by abutting (contacting or making close proximity) the end portions in the circumferential direction. The surface around the center hole of the disc medium is in contact with the inner periphery receiving portion of the disc. Thereby, even if the radially inner side of the annular inner periphery receiving portion communicates with the outside of the case, the inner periphery receiving portion prevents dust from entering the recording surface side of the disc medium.

  Here, since the end portions in the circumferential direction of the first convex portion and the second convex portion constituting the disk inner periphery receiving portion are formed in corresponding tapered shapes, the first convex portion and the second convex portion are formed. A gap is unlikely to occur between the butted portions with the convex portions. That is, the facing interval between the butted portions with respect to the backlash is reduced. For this reason, it is possible to prevent dust and the like from passing through the inside and outside of the disc inner periphery receiving portion formed in a ring shape by the first and second convex portions.

  As described above, in the disk cartridge according to the first aspect, it is possible to prevent intrusion of dust or the like via the pair of convex portions forming an annular shape in a state where the first shutter and the second shutter close the head opening. it can.

  In order to achieve the above object, a disk cartridge according to a second aspect of the present invention is a recording medium for recording a disk medium in a housing portion for rotatably housing a disk medium formed in a disc shape having a center hole in an axial center portion. On the surface side, a head opening for the head of the drive device to access the recording surface, and a circular chucking opening for the rotating shaft of the drive device to access and chuck the center hole of the disk medium And a first shutter and a second shutter each having an arcuate edge corresponding to the edge of the chucking opening, and the first shutter and the second shutter are mutually connected. The head opening is closed while abutting the end and maintaining the open state of the chucking opening, and the first shutter and the second shutter A shutter mechanism that opens the head opening by separating the ends, a first convex portion provided along an arc-shaped edge of the first shutter, and an arc-shaped edge of the second shutter And a second convex portion provided in a circular shape by abutting a circumferential end in a closed state of the head opening, and a disc inner periphery receiving portion that abuts a surface around the center hole in the disc medium The first convex portion and the second convex portion are characterized in that circumferential end portions that are abutted in a closed state of the head opening portion have tapered shapes corresponding to each other.

  According to a second aspect of the present invention, in the head opening for the head of the drive device to access the recording surface of the disk medium housed in the housing portion of the case, the first shutter and the second shutter abut against each other. Thus, the first shutter and the second shutter are opened by separating the end surfaces. In this state, the arcuate edges of the first shutter and the second person form an annular shape by matching the circumferential ends, and the annular portion maintains the open state of the chucking opening.

  In the state where the first shutter and the second shutter close the head opening, the first convex portion and the second convex portion along the arc-shaped edge respectively abut the circumferential end portions (contact or make close proximity). ), The surface around the center hole of the disc medium is in contact with the disc inner periphery receiving portion formed in an annular shape. Thus, in a configuration in which the chucking opening is not blocked, the disc inner periphery receiving portion prevents entry of dust into the recording surface side of the disc medium.

  Here, since the end portions in the circumferential direction of the first convex portion and the second convex portion constituting the disk inner periphery receiving portion are formed in corresponding tapered shapes, the first convex portion and the second convex portion are formed. A gap is unlikely to occur between the butted portions with the convex portions. That is, the facing interval between the butted portions with respect to the backlash is reduced. For this reason, the recording surface side of the disc medium located outside the inner periphery receiving portion of the disc from the inner side of the inner periphery receiving portion of the disc that forms a ring with the first and second protrusions and communicates with the chucking opening. Dust and the like are prevented from entering.

  Thus, in the disk cartridge according to claim 2, it is possible to prevent intrusion of dust or the like via the pair of convex portions forming an annular shape in a state where the first shutter and the second shutter close the head opening. it can.

  According to a third aspect of the present invention, there is provided the disc cartridge according to the first or second aspect, wherein the second shutter has the circumferential end formed in the tapered shape at the second shutter. The taper surface has a height that continuously increases from the leading end in the direction close to the first shutter to the boundary with the portion that is not tapered.

  In the disk cartridge according to claim 3, the circumferential end of the second protrusion is lowest at the leading end in the direction in which the second shutter is close to the first shutter, and the second protrusion extends from the end to the second protrusion. A taper surface whose height continuously increases toward a boundary portion with a portion not formed in a taper shape, and a circumferential end portion of the first convex portion is a taper surface corresponding to the taper surface. Thereby, since each taper surface of the 1st convex part and the 2nd convex part attracts each other with the operation which the 1st shutter and the 2nd shutter block the head opening part, in other words, Since the tapered surfaces are abutted against each other while absorbing the backlash, the generation of a gap due to the backlash can be effectively prevented.

  The disc cartridge according to a fourth aspect of the present invention is the disc cartridge according to any one of the first to third aspects, wherein the tapered circumferential end of the second convex portion has a diameter. It is characterized by a tapered surface whose height changes continuously along the direction.

  5. The disk cartridge according to claim 4, wherein the circumferential end of the second convex portion formed in an arc shape is a tapered surface whose height continuously changes along the radial direction. The circumferential end of each is a tapered surface corresponding to this tapered surface. As a result, the annular disc inner periphery receiving portion formed by abutting the tapered surfaces inclined along the radial direction has a long radial entry path, and dust or the like along the radial direction from the inside to the outside thereof. Can be effectively prevented. In particular, in the configuration in which these tapered surfaces are inclined even along the circumferential direction of the first convex portion and the second convex portion as described in claim 3, the tapered surfaces are abutted against each other while absorbing more backlash. Therefore, the generation of gaps due to backlash can be more effectively prevented.

  As described above, the disk cartridge according to the present invention can prevent intrusion of dust or the like through a pair of convex portions that form an annular shape with the first shutter and the second shutter closing the head opening. It has an excellent effect of being able to.

  A disc cartridge 10 according to an embodiment of the present invention will be described with reference to FIGS. An arrow A appropriately shown in each drawing indicates the loading direction of the disk cartridge 10 into the drive device, and for convenience, the side indicated by the arrow A that is the loading direction into the drive device will be described as the front side. The direction indicated by arrow B is the upper side, and the direction indicated by arrow C is the right side.

  FIG. 1 shows an external appearance of the disk cartridge 10 in a perspective view, and FIG. 2 shows the disk cartridge 10 in an exploded perspective view. As shown in these drawings, the disk cartridge 10 includes a case 14 that rotatably accommodates a disk medium 12 as a disk-shaped information recording / reproducing medium, and a recording / reproducing head that opens at the lower surface of the case 14. A shutter mechanism 18 for opening and closing the head opening 16 for accessing the recording surface of the disk medium 12 and a disk from the disk opening 20 that opens above the case 14 and allows the disk medium 12 to be inserted into and removed from the case 14. A disk holding mechanism 22 for preventing the media 12 from falling off is configured as a main component. In FIG. 1, the disk medium 12 is not shown.

  First, the general overall configuration of the disk cartridge 10 will be described, and then the abutting structure of the first convex portion 68 and the second convex portion 80 constituting the disc inner periphery receiving portion 90 which is the main part of the present invention will be described. To do.

[Overall configuration of disk cartridge]
(Disk media configuration)
The disk medium 12 accommodated in the disk cartridge 10 is formed in a disk shape as described above. A center hole 12A that is chucked (engaged and held) by the rotating spindle shaft of the disk drive device is provided in the axial center portion of the disk medium 12. Further, the lower surface of the disk medium 12 is configured such that the recording surface is covered and protected by a cover layer (both not shown). The recording surface is formed in an annular shape in the vicinity of the outer periphery of the lower surface of the disk medium 12 and in a portion excluding a predetermined range around the center hole 12A. An area between the hole edge of the center hole 12 </ b> A and the inner edge of the recording surface on the lower surface of the disk medium 12 is a chucking area for the rotating spindle shaft of the drive device to hold the disk medium 12. In the present embodiment, the diameter (outer diameter) of the disk medium 12 is approximately 120 mm.

(Case structure)
The case 14 is formed in a substantially rectangular flat container shape in plan view by joining the upper shell 24 and the lower shell 26. Specifically, the case 14 has a front edge portion formed in a substantially symmetrical circular arc shape in a plan view and a rear end formed in a linear shape along the left-right direction. It is designed to prevent loading.

  The upper shell 24 includes a top plate 28 having a shape corresponding to the shape of the case 14 in plan view, and an outer peripheral wall 30 erected downward substantially along the outer edge of the top plate 28. The top plate 28 is provided with a substantially circular disk opening 20 in plan view, and the inner diameter of the disk opening 20 is larger than the outer diameter of the disk medium 12. Thereby, the disk medium 12 can be inserted into and removed from the case 14 through the disk opening 20. The upper shell 24 includes an annular inner peripheral wall 32 erected downward along the edge of the disk opening 20.

  Further, notches 34 for attaching a disk pressing member 84 to be described later are provided at two locations on the rear end side of the top plate 28 and on the radially outer side of the inner peripheral wall 32. Further, on the right side of the cutout 34 on the right side of the top plate 28, a lock operation window 36 that is long in the left-right direction for operating a lock member 88 described later is provided. On the other hand, a notch portion 30A having a U-shaped edge portion that is elongated in the front-rear direction and opens downward is formed in the front-rear direction central portion of the portion constituting the right side wall of the case 14 in the outer peripheral wall 30. ing. The cutout portion 30A and the cutout portion 40A of the outer peripheral wall 40 described later of the lower shell 26 constitute a substantially rectangular shutter operation window 46 at the center in the front-rear direction of the right side wall of the case 14.

  The lower shell 26 includes a bottom plate 38 having a shape substantially corresponding to the top plate 28 and an outer peripheral wall 40 having a shape substantially corresponding to the outer peripheral wall 30. The bottom plate 38 is provided with a substantially circular chucking opening 42 corresponding to the center hole 12 </ b> A of the disk medium 12 and the head opening 16. In the following description, the chucking opening 42 and the head opening 16 may be collectively referred to as an access opening 44. The head opening 16 is formed in a substantially rectangular shape that is long in the radial direction of the chucking opening 42, and is continuous with the front side of the chucking opening 42. Therefore, the notch edge of the bottom plate 38 formed by the access opening 44 is formed in a substantially U shape that opens forward. Further, the head opening 16 is formed by cutting out the front central portion of the outer peripheral wall 40 in the left-right direction over the entire height.

  The outer peripheral wall 40 is configured such that the upper end (open end) of the outer peripheral wall 40 abuts the lower end (open end) of the outer peripheral wall 30 of the upper shell 24 to form the peripheral wall of the case 14. At a position corresponding to the cutout portion 30A of the upper shell 24 on the outer peripheral wall 40, a cutout portion 40A having a U-shaped edge portion that is elongated in the front-rear direction and opens upward is formed. In a state in which the outer peripheral wall 30 and the outer peripheral wall 40 are in contact with each other, the notch 30A and the notch 40A form a shutter operation window 46 (see FIG. 1) on the right side surface of the case 14. ing. The shutter operation window 46 is for exposing an operation projection 66 of an inner rotor 60 described later.

  Further, the lower shell 26 includes an inner wall 48 erected partially from the bottom plate 38 along a circumference coaxial with the chucking opening 42. The inner wall 48 has an inner diameter of an imaginary circle connecting the inner surfaces thereof larger than an outer diameter of the inner peripheral wall 32 of the upper shell 24, and the inner wall 48 is interposed between the inner peripheral wall 32 and the upper shell 24 and the lower shell 26. A gap is formed. In this gap, an annular wall 62 (described later) of the inner rotor 60 is inserted. The bottom plate 38, the inner wall 48, and the inner peripheral wall 32 of the upper shell 24 form a disk housing portion 50 (see FIG. 1) as a housing portion for housing the disk media 12 in the case 14. As described above, the disk storage unit 50 can be loaded and unloaded with the disk medium 12 through the disk opening 20.

  Further, a support shaft 52 projects from the vicinity of the left rear corner of the bottom plate 38. The shaft center of the support shaft 52 is located outside the circumference along the outer surface of the inner wall 48, that is, outside the disk housing portion 50. In the present embodiment, the support shaft 52 is formed in a cylindrical shape whose inside is a reference hole 52 </ b> A that opens to the outer surface of the bottom plate 38. From the vicinity of the right rear corner of the bottom plate 38, there is provided a protrusion 53 provided with a reference hole 53A that is paired with the reference hole 52A and is elongated in the left-right direction. Further, a pair of left and right bearings 54 project from the radially outer side of the inner wall 48 at the rear portion of the bottom plate 38 and are used for supporting the shaft of the disk pressing member 84.

  Furthermore, a pair of front and rear recesses 56A and 56B are provided in a substantially central portion in the front-rear direction near the left end of the bottom plate 38. The recesses 56A and 56B are disposed so as to include the start and end of the movement locus of a cam projection 72 (described later) of the inner rotor 60, respectively, and are separated from each other. Further, a pair of guide pins 58 are provided in the vicinity of the left front corner of the bottom plate 38. The pair of guide pins 58 are disposed on a virtual circumference coaxial with the inner wall 48 and larger in diameter than the inner wall 48, and are used for guiding a disk receiving member 82 described later.

  The lower shell 26 described above is joined to the upper shell 24 by screws to form the case 14 with the upper end surface of the outer peripheral wall 40 abutted against the lower end surface of the outer peripheral wall 30. It should be noted that the upper shell 24 and the lower shell 26 may be joined by, for example, ultrasonic welding, adhesion, or the like, instead of screwing.

(Configuration of shutter mechanism)
The shutter mechanism 18 is provided in the case 14. Specifically, the shutter mechanism 18 includes an inner rotor 60 disposed in the case 14. The inner rotor 60 includes an annular wall 62 formed in a short cylindrical shape. As described above, the annular wall portion 62 is slidably inserted into the gap between the inner peripheral wall 32 of the upper shell 24 and the inner wall 48 of the lower shell 26. As a result, the inner rotor 60 can be rotated coaxially with the disc accommodating portion 50 (the disc medium 12 accommodated in the case 14) with respect to the case 14.

  A flat plate-like first shutter 64 is integrally provided inside the lower end of the annular wall portion 62. The first shutter 64 is a disk having the same diameter and the same diameter as the annular wall 62, a notch 65 </ b> A having substantially the same shape as the access opening 44, and an inner peripheral disk receiving portion (arc rib) 80 of the second shutter 74 described later. The shape is provided with a notch 65B corresponding to the relative movement locus. Further, the annular wall portion 62 is formed with a substantially U-shaped notch portion 62A that is continuous with the radially outer end of the notch portion 65A and whose edge shape opens downward. The cut-out portion 62A coincides with the cut-out portion of the outer peripheral wall 40 of the lower shell 26, so that the recording / reproducing head can be accessed from the front of the disk cartridge 10.

  The first shutter 64 is slidably mounted on the bottom plate 38 (disk accommodating portion 50) of the lower shell 26, and the outer peripheral side and inner peripheral side of the head opening 16 as the inner rotor 60 rotates. A closed position (see FIG. 6) for closing a part of the head opening 16 and an open position (see FIG. 9) for retreating from the head opening 16 can be taken. In other words, the first shutter 64 positioned at the open position is positioned so that the cutout portion 65 </ b> A substantially coincides with the access opening 44.

  An operation projection 66 that is exposed to the outside from the shutter operation window 46 of the case 14 protrudes from the outer peripheral surface of the annular wall portion 62. The operation protrusion 66 is disposed at the front end of the shutter operation window 46 when the first shutter 64 is in the closed position, and is positioned at the rear end of the shutter operation window 46 when the first shutter 64 is in the open position. Has been.

  Further, from the upper surface of the first shutter 64, a first convex portion 68 formed in an arc shape is erected along an edge portion corresponding to the chucking opening portion 42 in the notch portion 65A. The first convex portion 68 and the second convex portion 80 to be described later form an annular disc inner periphery receiving portion 90, and the upper end surface of the disc inner periphery receiving portion 90 is on the lower surface of the chucking area of the disc medium 12. It comes to contact. Accordingly, the first shutter 64 is disposed between the bottom plate 38 and the disk medium 12 so as to open and close a part of the head opening 16.

  On the other hand, from the vicinity of the outer periphery on the upper surface of the first shutter 64, the outer periphery receiving convex portion 70 is erected so as to straddle the inner surface of the annular wall portion 62. The outer periphery receiving convex portion 70 has substantially the same height as the first convex portion 68, and an area outside the recording surface on the lower surface of the disk medium 12 comes into contact therewith. Accordingly, the first shutter 64 is configured to support the disc medium 12 from below at the first convex portion 68 and the outer periphery receiving convex portion 70 when the first shutter 64 is located at the closed position.

  Further, a cam protrusion 72 is provided so as to protrude from the vicinity of the outer periphery of the lower surface of the first shutter 64. The cam protrusion 72 is disposed on the radially outer side of the notch 65B, and always enters a cam groove 78 (described later) of the second shutter 74.

  Further, the shutter mechanism 18 includes a second shutter 74 that closes a part of the remaining portion of the head opening 16 (a part on the inner peripheral side) when the first shutter 64 is located at the closing position. The second shutter 74 is formed in a flat plate shape and slides on the bottom plate 38. For this reason, the portion of the first shutter 64 that interferes with the moving region of the second shutter 74, specifically, the radially outer portion of the notch 65B is thinner than the other portions. That is, the second shutter 74 is thinner than the portion of the first shutter 64 that closes the head opening 16.

  The second shutter 74 is formed in a long plate shape, and includes a boss portion 76 that is pivotally supported by the support shaft 52 of the lower shell 26 at one end portion in the longitudinal direction. As a result, the second shutter 74 rotates around the support shaft 52 to close a part on the inner peripheral side of the head opening 16 (see FIG. 6) and to retreat from the head opening 16. The position (see FIG. 9) can be taken. As shown in FIGS. 1 and 6, when the first shutter 64 and the second shutter 74 are in the closed position, the head opening 16 is completely brought into contact with the contact end surfaces 64A and 74A. It is the structure which obstruct | occludes.

  Then, the first shutter 64 moves from the closed position to the open position side by rotating in the direction of arrow D shown in FIG. 6 around the axis of the inner rotor 60, and the second shutter 74 moves the head around the support shaft 52. It is configured to move from the closed position to the open position side by rotating in the direction of arrow E which is substantially opposite to the arrow D with respect to the opening 16. Further, the first shutter 64 and the second shutter 74 are interlocked with each other. Specifically, the second shutter 74 is provided with a cam groove 78 substantially along the longitudinal direction, and the cam protrusion 72 of the first shutter 64 enters the cam groove 78.

  Thus, when the operation protrusion 66 of the inner rotor 60 moves rearward and the first shutter 64 rotates in the arrow D direction with the head opening 16 closed, the cam protrusion 72 rotates (revolves) in the arrow D direction. When the groove wall of the cam groove 78 is pressed, the second shutter 74 is rotated in the direction of arrow E. The cam protrusion 72 is positioned in the vicinity of the end of the cam groove 78 on the side of the support shaft 52 when the head opening 16 is closed, and the inner rotor 60 rotates in the direction of arrow D as shown in FIGS. Accordingly, the relative movement is performed so as to be separated from the support shaft 52.

  In the present embodiment, as shown in FIG. 8, the second shutter 74 reaches the open position before the first shutter 64, and then the second shutter 74 rotates in the direction of arrow E. In order to ensure rotation of the first shutter in the direction of arrow D while preventing the cam shaft 78, the end of the cam groove 78 opposite to the support shaft 52 side is cam protrusion when the second shutter 74 is located at the open position. It is formed in an arc shape that coincides with the movement locus of 72. Accordingly, the first shutter 64 moves from the rotational position shown in FIG. 8 to the open position shown in FIG. 9 without interfering with the second shutter 74. Further, in the shutter mechanism 18, the inner rotor 60 is rotated in the direction opposite to the arrow D from the opened state of the head opening 16, thereby closing the head opening 16 shown in FIG. 6 through the state shown in FIGS. 8 and 7. It is the structure which returns to a state.

  In the present embodiment, the second shutter 74 rotates in the direction of arrow E and moves to the open position side while the first shutter 64 is in the closed position, or the second shutter 74 moves in the direction of arrow F. It is allowed to rotate and move to the closed position. Specifically, as shown in FIG. 6, the contact end surface 74 </ b> A that is the abutting end of the second shutter 74 against the contact end surface 64 </ b> A of the first shutter 64 is formed in an arc shape in plan view. More specifically, the contact end surface 74 </ b> A is an arc centered on the axis of the support shaft 52 (boss portion 76) that is the rotation axis of the second shutter 74. The contact end surface 64A, which is the edge of the notch 65A in the first shutter 64 and is the abutting end with the contact end surface 74A, is a plan view that coincides with the contact end surface 74A when the head opening 16 is closed. It is formed in an arc shape.

  Since the contact end surfaces 64A and 74A have the arc shape as described above, the first shutter 64 and the second shutter 74 abut against the contact end surfaces 64A and 74A without any gaps, thereby closing the head opening 16. Thus, the head opening 16 can be opened and closed smoothly and reliably while maintaining the function.

  Here, the imaginary straight line L1 shown in FIG. 6 corresponds to the contact when it is assumed that the contact end face 64A substantially coincides with the right edge 16A of the head opening 16 when the first shutter 64 is located at the open position. It corresponds to the end face 64A. The virtual straight line L2 is a normal line of the virtual straight line L1 passing through the axis of the support shaft 52. From this figure, an arbitrary point on the virtual straight line L1 and the support shaft 52 are shown on the virtual straight line L1 on the arrow F side opposite to the virtual straight line L2 on the virtual straight line L1 (the movement side to the closing position of the second shutter 74). It can be seen that the angle between the line connecting the axes of the two and the virtual straight line L1 is an acute angle (less than 90 °). Therefore, if the contact end faces 64A and 74A are configured to coincide with the virtual straight line L1, the second shutter 74 cannot rotate in the arrow E direction unless the first shutter 64 first moves in the arrow D direction. . Similarly, in a state where the first shutter 64 is located at the closed position, the second shutter 74 cannot rotate from the open position side to the closed position.

  On the other hand, in the present embodiment, the contact end faces 64A and 74A have the arc shape, so that the second shutter 74 rotates in the arrow E direction or the arrow F direction without depending on the position of the first shutter 64. This is a configuration that can be moved. Therefore, the entire range of the contact end faces 64A and 74A does not need to have the arc shape, and at least the side portion of the arrow F from the virtual straight line L2 has the arc shape. In addition, the arrow E side part from the virtual straight line L2 in the contact end faces 64A and 74A can be formed in a straight line having an angle of 90 ° or more with the virtual straight line L2, for example. Regardless of the shape of the contact end faces 64A and 74A, the end of the arrow E side in the closed state of the head opening 16 is located slightly to the left of the left edge 16B of the head opening 16, and the case 14 It only has to be inside.

  As described above, as shown in FIG. 9, the abutting end surface 64A side edge (the right edge of the portion corresponding to the head opening 16) of the notch 65A of the first shutter 64 is formed in an arc shape. Except for the end face 64A, the head opening 16 is configured to substantially coincide with the right edge 16A when positioned at the open position. When both the first shutter 64 and the second shutter 74 are in the closed position, the end surface 74B that forms a corner with the contact end surface 74A of the second shutter 74 is in contact with the contact end surface 64A of the first shutter 64. In this case, the rotation in the direction of arrow F beyond the closing position of the second shutter 74 is restricted by hitting the end face 64B forming the corner.

  A virtual straight line L3 shown in FIG. 6 corresponds to the contact end surfaces 108A and 110A in the conventional disk cartridge 100. The conventional disc cartridge 100 is configured such that an angle formed between a virtual line L3 and a straight line connecting an arbitrary point on the virtual straight line L3 and the axis of the support shaft 52 is an obtuse angle over the entire length of the virtual straight line L3. As a result, the second shutter is allowed to rotate while the first shutter is in the closed position. Compared to this configuration, it can be seen that the second shutter 74 according to the present embodiment is significantly downsized. Further, in FIGS. 6 to 9, in order to facilitate understanding, parts other than those necessary for explanation of the operation of the first shutter 64 and the second shutter 74 (for example, the disk medium 12, the disk holding mechanism 22, the upper part) Illustration of the shell 24 and the like is omitted.

  Further, as shown in FIGS. 1 and 2, a second convex portion 80 formed in an arc shape protrudes from the upper surface of the second shutter 74. The second convex portion 80 is configured such that, in a state where the head opening portion 16 is closed, the circumferential end portion of the second convex portion 80 abuts the corresponding circumferential end portion of the first convex portion 68 to thereby form the annular disc inner peripheral receiving portion 90. It comes to form. The outer side (radially inner side) of the second convex portion 80 in the second shutter 74 is a notch 74C (see FIG. 2). Therefore, the chucking opening 42 is configured to be completely opened while both the first shutter 64 and the second shutter 74 are located at the closed position. In other words, the chucking opening 42 is configured to be always opened by the notches 65A and 74C and communicate with the disk opening 20.

  The disc inner periphery receiving portion 90 formed in an annular shape with the first convex portion 68 and the second convex portion 80 in a state where the head opening portion 16 is closed has an upper end surface which is substantially flush with the upper end surface of the disc medium 12. It is the structure which contacts the chucking area in the lower surface from below (supports from below). For this reason, dust or the like does not enter the lower surface of the disk medium 12, that is, the recording surface side via the chucking opening 42 that is always open.

  The disk inner periphery receiving portion 90 has a head opening at a circumferential end 68 </ b> A of the first protrusion 68 and a circumferential end 80 </ b> A of the second protrusion 80 that are abutted with each other with the head opening 16 closed. The part 16 is exposed to the outside. The abutting structure between the circumferential one end 68A of the first convex portion 68 and the circumferential one end 80A of the second convex portion 80 will be described later.

  In the shutter mechanism 18, when the inner rotor 60 rotates in the direction of arrow D, the cam protrusion 72 that has entered the recess 56 </ b> A of the lower shell 26 comes out of the recess 56 </ b> A, and the first shutter 64 is lifted and lifted from the second shutter 74. Is also located on the upper side. As a result, the second convex portion 80 of the second shutter 74 is separated from the lower surface of the disk medium 12 lifted by the first convex portion 68 at the initial stage of the opening operation of the head opening portion 16 and is rotated in the direction of arrow E. In this configuration, the second convex portion 80 of the shutter is prevented from coming into contact with the recording surface of the disk medium 12. In addition, since the first shutter 64 is provided with the notch portion 65 </ b> B, the second convex portion 80 of the second shutter 74 does not interfere with the first shutter 64.

  The cam projection 72 of the first shutter 64 that has moved to the open position enters the recess 56B to return the first shutter 64 to the state where it is placed on the bottom plate 38, and the disk media 12 is substantially parallel to the bottom plate 38. To come back. Thus, the chucking of the disk medium 12 by the rotating spindle shaft of the drive device is possible, and the rotating disk medium 12 is prevented from interfering with the first shutter 64. In the transition process from the opened state of the head opening 16 to the closed state, the reverse operation of the above description is performed.

  Further, the shutter mechanism 18 includes a disk receiving member 82. The disk receiving member 82 has a periphery of the outer periphery receiving projection 70 cut out at the radially outer end of the notch 65A of the first shutter 64 in a state where the first shutter 64 and the second shutter 74 close the head opening 16. A disk outer periphery receiving portion 82A is provided between the direction end portions. That is, the disk outer periphery receiving portion 82A forms an annular shape with the outer periphery receiving convex portion 70 of the first shutter 64 located at the closed position, and in this state, the upper surface is substantially flush with the upper surface of the outer periphery receiving convex portion 70, The configuration is such that the remaining part of the outer portion in the radial direction of the lower surface of the disk medium 12 is in contact from below (supported from below). Accordingly, dust or the like does not enter the lower surface of the disk medium 12, that is, the recording surface side via the disk opening 20.

  The disc receiving member 82 is supported by a pair of guide pins 58 of the lower shell 26 so as to be movable up and down. The disc receiving member 82 descends as the inner rotor 60 rotates in the arrow D direction, and rotates in the arrow D direction. It is set as the structure which does not interfere with the outer periphery receiving convex part 70. FIG. Although details are omitted, the corresponding circumferential end portions of the disk outer periphery receiving portion 82A and the outer periphery receiving protrusion 70 are formed in a tapered shape that overlaps vertically, and the disk outer periphery receiving portion is rotated by the rotation of the inner rotor 60 in the direction of arrow D. The configuration is such that 82 </ b> A is buried under the outer periphery receiving projection 70. In the transition process from the opened state of the head opening 16 to the closed state, the reverse operation of the above description is performed.

(Disk holding mechanism configuration)
The disk holding mechanism 22 includes a disk pressing member 84. The disc pressing member 84 is a pair of support shaft portions 84A that are rotatably supported by the pair of bearing portions 54 of the lower shell 26, and a pair of support shaft portions 84A that are formed integrally with the pair of support shaft portions 84A. And an arm portion 84B. Further, the arm portion 84B is provided with a pair of left and right disc contact portions 84C that contact the upper surface of the disc medium 12. The disc contact portion 84C can be made of rubber or the like which is a separate member with respect to the support shaft portion 84A and the arm portion 84B which are integrally formed of a resin material or the like.

  The disk pressing member 84 is a disk that causes the arm portion 84B to protrude into the disk housing portion 50 (disk opening 20) and the disk contact portion 84C to contact the upper surface of the disk medium 12 by rotating around the support shaft portion 84A. The pressing position, the disc rotation allowing position where the disc contact portion 84C is separated from the upper surface of the disc medium 12 while the arm portion 84B extends into the disc accommodating portion 50, and the disc insertion / removal where the arm portion 84B is retracted from the disc accommodating portion 50. The possible position can be selectively taken.

  As shown in FIG. 2, the disk holding mechanism 22 is provided with a disk pressing spring 86 for urging the disk pressing member 84 to the disk pressing position side, and an operation protrusion 88A provided in the case 14 so as to be slidable only in the left-right direction. And a lock member 88 that is exposed from the lock operation window 36. The disc presser spring 86 is a torsion coil spring. One end of the disc presser spring 86 is engaged with the arm portion 84 </ b> B, and the other end is engaged with the engagement protrusion 88 </ b> B of the lock member 88. As a result, the disc pressing member 84 is normally positioned at the disc pressing position by the urging force of the disc pressing spring 86 and holds the disc medium 12.

  The disk pressing member 84 is moved from the disk pressing position to the disk rotation allowable position with the operation of the first shutter 64 opening the head opening 16. Specifically, the annular wall portion 62 of the inner rotor 60 is provided with a portion whose wall height is higher than other portions (not shown), and this portion is accompanied by the rotation of the inner rotor 60 in the direction of arrow D. Thus, by lifting the arm portion 84B upward in the notch portion 34, the disc pressing member 84 is moved from the disc pressing position to the disc rotation allowable position. The state in which the disk pressing member 84 is positioned at the disk rotation allowable position is maintained with the head opening 16 being opened. Thus, the disc pressing member 84 is prevented from interfering with the rotating disc medium 12.

  The lock member 88 engages with the other end of the disk presser spring 86 when the operation protrusion 88A is positioned at the left end of the lock operation window 36, but the disk 88 when the operation protrusion 88A is positioned at the right end of the lock operation window 36. The engagement with the other end of the presser spring 86 is released. Therefore, by operating the operation protrusion 88A and moving the lock member 88 to the right, the urging force of the disk pressing spring 86 does not act on the disk pressing member 84. If the disk pressing member 84 is manually moved to the disk insertion / removal position in this state, the disk pressing member 84 will not return to the disk pressing position even if the hand is released from the disk pressing member 84, and the disk medium 12. The disc can be easily inserted into, removed from (removed from) the disc housing 50, and replaced.

[Configuration of the butted part of the inner periphery receiving convex part]
As shown in FIG. 3, one end 80 </ b> A of the second convex portion 80 is a substantially upward tapered surface 80 </ b> B. One end 68A of the first convex portion 68 is a tapered surface 68B opposite to the tapered surface 80B. That is, the taper surface 80B and the taper surface 68B correspond to each other and can be brought into surface contact over substantially the entire surface. This will be specifically described below.

  As shown in FIGS. 4A and 5A, the tapered surface 80B has the upper edge of the end surface 74B of the second shutter 74 as a base end in the circumferential direction, and is the lowest position at the base end. ing. And the taper surface 80B is formed so that height may increase continuously along the circumferential direction of the 2nd convex part 80 toward the terminal end side. The end 80C of the tapered surface 80B is formed so as to intersect the width direction (radial direction) of the second convex portion 80 so as to substantially coincide with the virtual straight line L1 in a state where the second shutter 74 is located at the closed position. (See FIG. 6). Therefore, it can be grasped that the tapered surface 80B has a portion whose end 80C side is continuously reduced in width, and is also tapered in the width direction.

  Further, the upper edge of the end surface 74B that defines the base end of the tapered surface 80B is formed in a tapered shape in which the radially outer side of the second convex portion 74 is higher than the radially inner side. For this reason, the taper surface 80B has a tapered shape in which the height continuously increases from the inner peripheral surface to the outer peripheral surface of the second convex portion 80 (one end portion 80A), and the taper angle is maximum on the base end side. And the end 80C is 0.

  As described above, the tapered surface 80B is a curved surface whose height continuously changes along the circumferential direction and the radial direction (partial width direction). The base end, that is, the end surface 74B (part of the radial direction) of the tapered surface 80B may be set lower than the thickness of the second shutter 74 (not necessarily configured to protrude from the upper surface of the second shutter 74).

  On the other hand, one end 68 </ b> A of the first convex portion 68 provided with the tapered surface 68 </ b> B protrudes from the end surface 64 </ b> B of the first shutter 64 along the circumferential direction of the first convex portion 68. The upper edge of the end surface 64B defines the base end of the tapered surface 68B, and the protruding end of the one end 68A defines the end 68C of the tapered surface 68B. The end 68C is formed so as to intersect the width direction (radial direction) of the first convex portion 68 so as to substantially coincide with the right edge of the notch 65A excluding the contact end face 64A. As shown in FIG. 9, the end 68 </ b> C is positioned so as to substantially coincide with the right edge 16 </ b> A of the head opening 16 in a plan view when the first shutter 64 is in the open position.

  The tapered surface 68B is formed so as to continuously act from the base end to the terminal end corresponding to the taper surface 80B, and is sharpened so that the thickness is substantially zero at the terminal end 68C. Therefore, when the end 68C of the taper surface 68B and the end 80C of the taper surface 80B are made to coincide with each other, a substantially flush disc inner periphery receiving portion 90 is formed. Further, the tapered surface 68B is continuously higher along the radial direction from the inner peripheral surface to the outer peripheral surface side of the first convex portion 68 corresponding to the tapered surface 80B (the one end portion 68A is made thin). The taper angle is maximum at the base end side and 0 at the end 68C. As described above, the tapered surface 68B is a curved surface whose height continuously changes along the circumferential direction and the radial direction (partial width direction), and this curved surface corresponds to the shape of the tapered surface 80B. Yes.

  The first convex portion 68 and the second convex portion 80 are illustrated when the first shutter 64 and the second shutter 74 abut the end surface 64B and the end surface 74B as the head opening portion 16 is closed. 4 (B), FIG. 5 (B), and FIG. 5 (C), the taper surface 68B and the taper surface 80B are overlapped with each other to form the disc inner periphery receiving portion 90. Yes. In this state, the end 68C of the tapered surface 68B and the end 80C of the tapered surface 80B are abutted at the same high level.

  Further, since the tapered surfaces 68B and 80B are formed so as to be higher on the outer side in the radial direction, the taper surfaces 68B and 80B are rotated in different directions with respect to the head opening 16, and take the first rotation position as shown in FIG. The operation of the shutter 64 and the second shutter 74 is not hindered.

  On the other hand, the other end in the circumferential direction opposite to the one end 80A of the second convex portion 80 is close to the rotational axis of the second shutter 74 and is less affected by backlash. Although it has a simple butting structure with the other circumferential end opposite to the one end 68A of the portion 68, the above-mentioned butted portion between the other circumferential ends of the first convex portion 68 and the second convex portion 80 You may employ | adopt the taper structure similar to the one end parts 68A and 80A.

  Next, the operation of this embodiment will be described.

  In the disk cartridge 10 configured as described above, the first shutter 64 and the second shutter 74 are positioned at the closed position to block the head opening 16 when not in use, such as during storage or transportation. Further, the disk pressing member 84 presses the disk medium 12 downward by the urging force of the disk pressing spring 86 to prevent the disk medium 12 from rattling.

  The first convex portion 68 and the second convex portion 80 form an annular disc inner periphery receiving portion 90, and the upper end surface of the disc inner periphery receiving portion 90 is in contact with the chucking area of the disc medium 12. . Further, the outer periphery receiving convex portion 70 and the disk outer periphery receiving portion 82 A of the disk receiving member 82 form an annular shape and abut on the outer side in the radial direction from the recording surface of the disk medium 12. As a result, intrusion of dust and the like from the inner peripheral side of the disk medium 12 to the recording surface side and intrusion of dust and the like from the outer peripheral side of the disk medium 12 to the recording surface side are prevented, and the recording surface of the disc medium 12 is Contact with the first shutter 64 and the second shutter 74 is prevented.

  When this disc cartridge 10 is used, that is, when information is recorded on the disc medium 12 or when information recorded on the disc medium 12 is reproduced, the disc cartridge 10 is loaded into the drive device along the direction of arrow A. . With this loading operation (relative movement between the disk cartridge 10 and the drive device), the opening / closing member of the drive device engages with the operation protrusion 66 of the inner rotor 60 and moves the operation protrusion 66 rearward.

  Then, the inner rotor 60, that is, the first shutter 64 rotates in the direction of arrow D, and the second shutter 74 rotates in the direction of arrow E in conjunction with this. 7 and FIG. 8, when the operation projection 66 moves to the rear end of the shutter operation window 46, the head opening 16 is completely opened as shown in FIG. At this time, as the cam projection 72 of the first shutter 64 comes out of the concave portion 56A, the first convex portion 68 provided on the first shutter 64 lifts the disc media 12, and what is the axis of the disc media 12? It is possible to prevent the second convex portion 80 provided on the second shutter 74 rotating around a different axis from interfering with the recording surface of the disk medium 12 and being damaged. When the cam projection 72 enters the recess 56B, the disk medium 12 supported by the outer periphery receiving projection 70 returns to a state parallel to the bottom plate 38, which is a positioning reference for the drive device in the case 14.

  Next, in the drive device, the disk cartridge 10 is positioned by inserting positioning pins into the reference holes 52A and 53A of the bottom plate 38, for example. In this positioning state, the rotating spindle shaft of the drive device enters from the chucking opening 42, and the rotating spindle shaft chucks the center hole 12 </ b> A (and the chucking area) of the disk medium 12 to hold the disk medium 12. However, it is separated from the upper surface of the first shutter 64. When the rotary spindle shaft rotates, the disk medium 12 is driven to rotate in the case 14 in a non-contact manner. On the other hand, the recording / reproducing head of the drive device enters from the head opening 16. By this recording / reproducing head, information is recorded on the recording surface of the disk medium 12, or information recorded on the recording surface is reproduced (the disk medium 12 is used).

  After use of the disk medium 12, the disk cartridge 10 is ejected from the drive device. With this discharging operation, the opening / closing member of the drive device engages with the operation protrusion 66 of the inner rotor 60 and moves the operation protrusion 66 forward. Then, the inner rotor 60, that is, the first shutter 64 rotates in the direction opposite to the arrow D, and the second shutter 74 rotates in the direction of the arrow F in conjunction with this. When the operation projection 66 moves to the front end of the shutter operation window 46 through the state shown in FIGS. 8 and 7, the head opening 16 returns to the completely closed state as shown in FIG.

  Also at this time, as the cam projection 72 of the first shutter 64 comes out of the concave portion 56B, the first convex portion 68 provided on the first shutter 64 lifts the disc media 12, and the axis of the disc media 12 The second convex portion 80 provided on the second shutter 74 that rotates about different axes is prevented from interfering with the recording surface of the disk medium 12 and being damaged. When the cam projection 72 enters the concave portion 56A, the disk medium 12 supported by the outer peripheral receiving convex portion 70 returns to a state parallel to the bottom plate 38 which is a positioning reference for the drive device in the case 14.

  Then, as the first shutter 64 and the second shutter 74 close the head opening 16, the taper surface 68B of the first protrusion 68 and the taper surface 80B of the second protrusion 80 are brought into contact with each other so that the disk An inner circumference receiving portion 90 is formed, and an upper end surface of the disc inner circumference receiving portion 90 comes into contact with a chucking area of the disc medium 12. Thus, the disk cartridge 10 returns to the state before use.

  Here, in the first convex portion 68 and the second convex portion 80 constituting the disc inner periphery receiving portion 90, one end portions 68A and 80A that are abutted with each other in the closed state of the head opening portion 16 are tapered surfaces 68B that correspond to each other. , 80B, the gap between the first protrusion 68 and the second protrusion 80 is less likely to occur. That is, even if the taper surfaces 68B and 80B are separated by play, the taper surfaces 68B and 80B are opposed to each other at a narrow interval. It is formed in a difficult shape. For this reason, the disc is formed from the radially inner side of the disc inner periphery receiving portion 90 that is formed in an annular shape by the first convex portion 68 and the second convex portion 80 with which the one end portions 68A and 80A abut each other and communicates with the chucking opening 42. It is possible to prevent dust and the like from entering the recording surface side of the disk medium 12 located on the radially outer side of the inner circumferential receiving portion 90.

  In particular, since the tapered surfaces 68B and 80B have a shape in which the high level is continuously changed along the circumferential direction, the first shutter 64 and the second shutter 74 perform the first closing operation with the operation of closing the head opening 16. The tapered surfaces 68B and 80B of the convex portion 68 and the second convex portion 80 are abutted against each other. Accordingly, the tapered surfaces 68B and 80B are abutted against each other while absorbing the backlash, and can effectively prevent the occurrence of a gap due to the backlash.

  In particular, since the tapered surfaces 68B and 80B have a shape that continuously changes the height along the radial direction, the radial intrusion path in the disk inner periphery receiving portion 90 becomes longer, and the periphery of the periphery receiving portion 90 without the disk becomes longer. Intrusion of dust and the like along the radial direction from the radially inner side to the radially outer side can be effectively prevented. In addition, as described above, the tapered surfaces 68B and 80B have a shape that continuously changes the height along the circumferential direction, that is, the tapered surfaces 68B and 80B have a double taper structure. , 80B are abutted against each other while more effectively absorbing the backlash, and can effectively prevent the occurrence of a gap due to the backlash.

  As described above, in the disk cartridge 10 according to the present embodiment, the first shutter 64 and the second shutter 74 close the head opening 16 and pass through the pair of convex portions 68 and 80 that form an annular shape. It is possible to effectively prevent dust and the like from entering the recording surface side of the medium 12.

  In the above embodiment, the structure for preventing dust and the like from entering between the first convex portion 68 and the second convex portion 80 constituting the disc inner periphery receiving portion 90 has been described. For example, the following modifications are described. The dustproof property between the first shutter 64 and the second shutter 74 may be improved by configuring as in the example. In the first modification shown in FIG. 10, a covering portion 92 that covers the contact portions of the contact end surfaces 64 </ b> A and 74 </ b> A formed in an arc shape extends along the lower surface of the first shutter 64. The edge portion of the covering portion 92 is formed in a straight line so as to connect both end portions of the contact end face 64A, and along the right edge 16A of the head opening portion 16 when the head opening portion 16 is open (not shown). It is configured. That is, the edge of the covering portion 92 coincides with the imaginary straight line L1 shown in FIG. 6 when the head opening 16 is closed. By providing the covering portion 92, the first shutter 64 and the second shutter 74 have an imprint structure. In other words, even if a gap is formed between the first shutter 64 and the second shutter 74, this gap Becomes a maze structure, and the dust resistance between the contact end faces 64A and 74A of the first shutter 64 and the second shutter 74 is improved. In addition, it is also possible to improve the dust resistance between the contact end surfaces 64A and 74A of the first shutter 64 and the second shutter 74 by making the contact end surfaces 64A and 74A have a tapered structure corresponding to each other.

  In the second modification shown in FIGS. 11 to 13, the tongue 92 is formed along the upper surface of the first shutter 64. An edge portion of the tongue portion 92 along the longitudinal direction on the notch portion 65A side has an arc shape that substantially coincides with the contact end surface 64A when the tongue portion 92 is not provided in a plan view. An edge portion of the tongue portion 92 along the longitudinal direction opposite to the notch portion 65 </ b> A is an arcuate contact end surface 64 </ b> A that abuts against the contact end surface 74 </ b> A of the second shutter 74. That is, both edge portions along the longitudinal direction of the tongue portion 92 are formed in a concentric arc shape. The contact end surface 74 that is abutted against the contact end surface 64 </ b> A is formed as an edge portion of the extended portion 94 that extends to the distal end side of the second shutter 74. The contact end surface 74A is formed in an arc shape around the axis of the support shaft 52 (boss portion 76). Therefore, in the second modification, the second shutter 74 is slightly extended in the longitudinal direction. However, since the contact end surface 74A is formed in an arc shape, the second shutter 74 is hardly enlarged in the width direction. When the head opening 16 is closed, the first shutter 64 and the second shutter 74 abut against (or bring close to each other) the contact end surfaces 64A and 74A, and the tongue 92 and the extending portion 94. Are configured to overlap each other vertically.

  Further, one end portion 68 </ b> A of the first convex portion 68 is integrally formed continuously from the tongue portion 92. Furthermore, the end 68C of the tapered surface 68B formed at the one end 68A is formed as a stepped portion, and is a surface along the crossing direction with respect to the right edge 16A in a bottom view when the head opening 16 is open. (See FIG. 13). That is, the end 68A in the second modification is formed as if the tip of the end 68A in the above-described embodiment is cut away. On the other hand, one end portion 80A of the second convex portion 80 is located on the boss portion 76 side with respect to the extending portion 94, and a tapered surface 80B corresponding to the tapered surface 68B is formed. That is, the taper surface 80B is a step portion along the direction in which the end 80C intersects the circumferential direction, and the step defining the end 80C is abutted against the taper surface 68B with almost no gap between the first shutter 64 and the step 80C. It is set as the structure which abuts on the step part which prescribes | regulates the termination | terminus 68C. Thereby, the disc inner periphery receiving portion 90 is formed without a gap.

  In the second modified example, the dust-proof property between the first shutter 64 and the second shutter 74 in the closed state of the head opening 16, the first convex portion 68 and the second convex portion constituting the disc inner periphery receiving portion 90. In addition to improving the dust resistance between the first shutter 64 and the first shutter 64, since no undercut portion or sharp portion is formed, the moldability is good when the first shutter 64 (inner rotor 60) is made of a resin material. It is. Further, even if a gap is generated between the contact end faces 64A and 74A, the gap is covered with the tongue 92, so that the aesthetic appearance is not impaired.

  In the above embodiment, the taper surfaces 68B and 80B have a preferable double taper structure in which a high level changes along the circumferential direction and the radial direction. However, the present invention is not limited to this, and for example, a taper surface. The surfaces 68B and 80B may be configured to change a high level along only one of the circumferential direction and the radial direction, and are tapered surfaces that change only the width along the circumferential direction along the end points 68C and 80C and the vertical direction. There may be.

  Furthermore, in the above-described embodiment, the configuration in which the disk opening 20 is provided in the case 14 is illustrated, but the present invention is not limited to this, and for example, the top plate 28 may have no opening. The head opening 16 or the access opening 44 may be provided on the top plate 28 instead of the disk opening 20. In the latter case, the shutter mechanism 18 or another shutter mechanism can be provided between the top plate 28 and the disk medium 12. In the above embodiment, the chucking opening 42 is always open. However, the present invention is not limited to this, and the chucking opening 42 together with the head opening 16 includes the first shutter 64 and the second shutter 64. The structure closed by the shutter 74 may be sufficient. However, the present invention is preferably applied to a configuration having the disk opening 20 or the chucking opening 42 being always open.

  Furthermore, in the above-described embodiment, the first shutter 64 and the second shutter 74 are configured to rotate around different rotational axes. However, the present invention operates the first shutter 64 and the second shutter 74. It is not limited by. Therefore, the present invention is not limited to a preferable configuration in which the abutting end surfaces 64A and 74A of the first shutter 64 and the second shutter 74 are formed in an arc shape.

  Further, in the above embodiment, the diameter of the disk medium 12 is approximately 120 mm. However, the present invention is not limited to this, and the present invention can be applied to the disk cartridge 10 including the disk medium 12 of any size. Needless to say. Further, for example, the disk medium 12 may be a double-sided recording type as well as a single-sided recording type, and may be a reproduction-only disk medium that makes it impossible for the user to record information. Therefore, the recording / reproducing head of the drive device described above may have only a recording function or only a reproducing function.

1 is a perspective view showing an external appearance of a disk cartridge according to an embodiment of the present invention. 1 is an exploded perspective view of a disc cartridge according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a shutter mechanism constituting the disk cartridge according to the embodiment of the present invention. FIG. 2 is a diagram showing a first convex portion and a second convex portion that constitute a disc cartridge according to an embodiment of the present invention, and (A) is a perspective view in a state where the first convex portion and the second convex portion are separated from each other. FIG. 4B is a perspective view of a state in which the first convex portion and the second convex portion are brought into contact with each other. It is a figure which shows the 1st convex part and the 2nd convex part which comprise the disc cartridge which concerns on one Embodiment of this invention, Comprising: (A) is a model of the state which the 1st convex part and the 2nd convex part spaced apart (B) is a schematic side view of the state in which the first convex portion and the second convex portion are brought into contact with each other, and (C) is a sectional view taken along line 5C-5C in FIG. 5 (B). is there. FIG. 5 is a schematic plan view showing a closed state of a head opening by a shutter mechanism constituting a disk cartridge according to an embodiment of the present invention. FIG. 5 is a schematic plan view showing a process of closing or opening a head opening of a shutter mechanism constituting a disk cartridge according to an embodiment of the present invention. FIG. 8 is a schematic plan view showing a state different from FIG. 7 in the process of closing or opening the head opening of the shutter mechanism constituting the disk cartridge according to the embodiment of the present invention. FIG. 3 is a schematic plan view showing an open state of a head opening by a shutter mechanism that constitutes a disk cartridge according to an embodiment of the present invention. FIG. 10 is an exploded perspective view showing a first modification of the shutter mechanism constituting the disk cartridge according to the embodiment of the present invention. It is a disassembled perspective view which shows the 2nd modification of the shutter mechanism which comprises the disc cartridge which concerns on one Embodiment of this invention. FIG. 10 is a schematic bottom view showing a second modified example of the shutter mechanism constituting the disk cartridge according to the embodiment of the present invention in a closed state of the head opening. FIG. 10 is a schematic bottom view showing a second modified example of the shutter mechanism constituting the disk cartridge according to the embodiment of the present invention in a state where the head opening is opened. 2A and 2B are diagrams showing a conventional disk cartridge, in which FIG. 1A is a plan view showing a closed state of a head opening by a shutter mechanism, and FIG. 2B is a plan view showing an opened state of a head opening by a shutter mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Disc cartridge 12 Disc media 14 Case 16 Head opening part 18 Shutter mechanism 42 Chucking opening part 50 Disc accommodating part (accommodating part)
64 1st shutter 68 1st convex part 68B Tapered surface 74 2nd shutter 80 2nd convex part 80B Tapered surface 90 Disc inner periphery receiving part

Claims (4)

A case in which a head opening for a head of a drive device to access the recording surface is provided on the recording surface side of the disk medium in a housing portion that rotatably accommodates a disk-shaped disk medium;
A shutter mechanism in which the first shutter and the second shutter abut against each other to close the head opening, and the first shutter and the second shutter are spaced apart from each other to open the head opening; ,
The arc-shaped first convex portion provided on the first shutter and the arc-shaped second convex portion provided on the second shutter abut each other on the circumferential end with the head opening closed. A disc inner periphery receiving portion that is formed in an annular shape and abuts against a surface around a center hole provided in an axial center portion of the disc medium,
2. The disk cartridge according to claim 1, wherein the first convex portion and the second convex portion have a tapered shape in which circumferential end portions that are abutted in a closed state of the head opening portion correspond to each other. A head opening for the head of the drive device to access the recording surface on the recording surface side of the disk medium in a housing portion that rotatably accommodates a disk medium formed in a disc shape having a center hole in the shaft center portion. And a case provided with a circular chucking opening for chucking by accessing the center hole of the disk medium by the rotating shaft of the drive device, and
A first shutter and a second shutter each having an arcuate edge corresponding to an edge of the chucking opening, wherein the first shutter and the second shutter abut against each other and the chucking is performed; A shutter mechanism that closes the head opening while maintaining an open state of the opening, and opens the head opening by separating the first shutter and the second shutter from each other;
The first projection provided along the arcuate edge of the first shutter and the second projection provided along the arcuate edge of the second shutter are in a closed state of the head opening. A disc inner periphery receiving portion that is formed in an annular shape by abutting the circumferential end portion, and abuts against a surface around the center hole in the disc medium,
2. The disk cartridge according to claim 1, wherein the first convex portion and the second convex portion have a tapered shape in which circumferential end portions that are abutted in a closed state of the head opening portion correspond to each other. The circumferential end portion of the second convex portion formed in the taper shape is a boundary portion between the leading end portion in the direction in which the second shutter is close to the first shutter and the portion that is not tapered. 3. The disk cartridge according to claim 1, wherein the disk cartridge has a tapered surface whose height increases continuously. The circumferential end portion formed in the tapered shape in the second convex portion is a tapered surface whose height continuously changes along the radial direction. 4. The disk cartridge according to any one of items 3.

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