JP2007095206A - Disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve operability by applying a uniform operation force when an erroneous deletion preventing member is performed slide operation. <P>SOLUTION: An arrangement part 72 in a cartridge main body includes a guide wall 76 formed in the sliding direction of an erroneous deletion preventing member 73. The erroneous deletion preventing member 73 includes a first elastic engagement part 85 formed roughly in parallel with the guide wall 76 from one side of the sliding direction, and having a first engagement projected part 85a formed on its tip side, and a second elastic engagement piece 86 formed roughly in parallel with the guide wall 76 from the other side of the sliding direction, and having a second engagement projected part 86a formed on its tip side. The guide wall 76 includes a first recording permission engagement recess 77a for holding the erroneous deletion prevention member 73 in a recording permission position, and a first recording inhibition engagement recess 77b for holding the erroneous deletion prevention member 73 in a recording inhibition position in the surface of the first elastic engagement piece 85 side, and a second recording permission engagement recess 78a for holding the erroneous deletion preventing member 73 in the recording permission position and a second recording inhibition engagement recess 78b for holding the erroneous deletion prevention member 73 in a recording inhibition position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk cartridge having improved operability of an erroneous erasure prevention mechanism.

  As a disc-shaped recording medium, a write-once or rewritable optical disc capable of recording and reproducing data such as audio data, video data, computer processing data, and a read-only optical disc on which such data is recorded Patent Document 1 discloses a disk cartridge that uses the recording medium as a recording medium. The optical disk of the disk cartridge disclosed in Patent Document 1 is a recordable optical disk. For this reason, an erroneous erasure preventing mechanism for preventing erroneous erasure of an information signal is provided at the rear corner portion.

  As shown in FIG. 24, the erroneous erasure prevention mechanism 101 is provided in the arrangement portion 102 surrounded by the rising peripheral wall 102a of the corner portion on the back surface 100a in the cartridge main body 100 that houses the optical disc. The erroneous erasure preventing member 103 is slidably attached. The arrangement portion 102 is provided with a detection hole (not shown) on the bottom surface of the cartridge main body for detecting whether the detector on the recording and / or reproducing apparatus side is open, and the erroneous erasure preventing member 103 is slid on the back surface of the cartridge main body. An operation hole 104 for operation is formed. Further, the arrangement portion 102 has a guide piece 105 formed along the moving direction of the erroneous erasure preventing member 103, and a part of the rising peripheral wall 102 a parallel to the guide piece 105 serves as a guide wall surface 106. . The guide wall surface 106 has a recordable engagement recess 107 for holding the erroneous erasure prevention member 103 at the recordable position and an unrecordable engagement recess 108 for holding the erroneous erasure prevention member 103 at the nonrecordable position. Is formed.

  As shown in FIG. 25, the erroneous erasure preventing member 103 disposed in such a disposing portion 102 has a base portion 111. A guide groove 112 that engages with the guide piece 105 of the arrangement portion 102 is formed in the base portion 111. In addition, an operating piece 113 that is exposed to the outside from the operation hole 104 of the arrangement portion 102 is formed on the base body portion 111. In addition, an elastic engagement piece 114 is formed in the base portion 111 at a portion in sliding contact with the guide wall surface 106 of the arrangement portion 102. This elastic engagement piece 114 is formed with an engagement protrusion 115 that is selectively engaged with the recordable engagement recess 107 and the record disable engagement recess 108 at the tip.

  FIG. 26 shows a state where the erroneous erasure preventing member 103 is disposed in the disposing portion 102 of the cartridge main body 100 and is in a recordable position. As shown in FIG. 26, the engagement protrusion 115 of the elastic engagement piece 114 of the erroneous erasure prevention member 103 is engaged with the recordable engagement recess 107 of the guide wall surface 106 of the arrangement portion 102. When the operation piece 113 exposed to the outside through the operation hole 104 is operated and slid in the direction of the arrow X in FIG. 26, the erroneous erasure prevention member 103 is elastically displaced, Then, it rides between the recordable engagement recess 107 and the record disable engagement recess 108, and then engages with the record disable engagement recess 108 as shown in FIG. As a result, the erroneous erasure preventing member 103 is held at a non-recordable position. Further, in order to slide from the unrecordable position to the recordable position, the erroneous erasure preventing member 103 is slid in the opposite direction of the arrow X in FIG. The mating projection 115 is moved.

  Thus, the disk cartridge of Patent Document 1 can be switched between a recordable state and a record impossible state.

  By the way, when comparing the operating force when the erroneous erasure preventing member 103 is slid from the recordable position to the non-recordable position and when the slide operation is performed from the non-recordable position to the recordable position, the operation force differs between the two. As shown in FIG. 26, when the erroneous erasure preventing member 103 is slid from the recordable position to the nonrecordable position, the elastic engagement piece 114 needs to get over the recordable engagement recess 107. The elastic engagement piece 114 generates a tensile force against the recordable engagement recess 107. For this reason, the operating force of the erroneous erasure preventing member 103 becomes larger than when the slide operation is performed from the unrecordable position to the recordable position. For this reason, a user's operation feeling will become unstable.

  In addition, as shown in FIG. 27, the operating force for sliding the erroneous erasure preventing member 103 from the non-recordable position to the recordable position is smaller than that when sliding from the recordable position to the non-recordable position. . Accordingly, there is a possibility that the erroneous erasure preventing member 103 slides from the unrecordable position to the recordable position without being noticed by the user, such as an impact at the time of dropping, and enters the recordable state, thereby erasing the information signal by mistake. In order to prevent such a situation, if the design is such that the operating force when sliding from the non-recordable position to the recordable position is increased, the operating force when sliding from the recordable position to the non-recordable position is accordingly accompanied. Becomes too large and the usability deteriorates.

  Even from the above, it is possible to equalize the operating force when sliding the erroneous erasure preventing member 103 from the recordable position to the non-recordable position and the operation force when sliding from the non-recordable position to the recordable position. Is extremely important.

JP 2003-109356 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a disc cartridge provided with an erroneous erasure prevention mechanism capable of improving the operability of the erroneous erasure prevention member. is there.

  It is another object of the present invention to provide a disc cartridge that can prevent a change from a recordable state to a recordable state without knowing it and improve operability.

  The disc cartridge according to the present invention includes a cartridge main body that rotatably stores a disc on which an information signal can be recorded, and an erroneous erasure prevention mechanism that prevents erroneous erasure of the information signal with respect to the disc. The erroneous erasure prevention mechanism includes an erroneous erasure prevention member that is slidably disposed on the disposition portion in the cartridge body, a detection hole formed in the disposition portion, and the detection hole of the disposition portion. And operation holes formed on different surfaces. A guide wall formed along the sliding direction of the erroneous erasure preventing member is formed in the arrangement portion. The erroneous erasure prevention member includes a first elastic engagement piece that is formed substantially parallel to the guide wall from one side in the sliding direction and has a first engagement protrusion formed on a tip side, and the slide A second elastic engagement piece formed substantially parallel to the guide wall from the other side in the direction and having a second engagement protrusion formed on the tip side, and the first disposition portion on the first portion The elastic engagement piece and the second elastic engagement piece are disposed so as to sandwich the guide wall. A first recordable engagement that holds the erroneous erasure prevention member that engages and disengages with the first engagement protrusion at a recordable position on a surface of the guide wall on the first elastic engagement piece side. A concave portion and a first non-recording engagement concave portion that holds the erroneous erasure preventing member at a non-recordable position are formed side by side, and the second engagement protrusion is formed on the surface of the second elastic engagement piece. A second recordable engagement recess for holding the erroneous erasure prevention member engaged and disengaged at a recordable position and a second recordable engagement recess for holding the erroneous erasure prevention member at a record impossible position are arranged side by side. It is formed with.

  According to the present invention, the first elastic engagement piece and the second elastic engagement piece are provided so as to be opposite to each other across the guide wall of the arrangement portion. Therefore, the first and second engaging protrusions are directed from the first and second recordable engaging recesses or the first and second non-recordable engaging recesses to the destination engagement recesses. When you get on, make sure to generate a tensile force in one place. As a result, the erroneous erasure prevention mechanism can make the operation force the same regardless of the direction in which the erroneous erasure prevention member is slid and can improve operability.

  Hereinafter, a cartridge to which the present invention is applied will be described with reference to the drawings. As shown in FIG. 1 to FIG. 3, a disc cartridge 1 to which the present invention is applied is obtained by rotating an optical disc 3 serving as a recording medium into a cartridge main body 2. An inner rotor 4 that accommodates the optical disk 3 rotatably and a pair of shutter members 5a and 5b are accommodated therein.

  As shown in FIG. 2, the optical disc 3 accommodated in the disc cartridge 1 has a diameter of 12 cm, which is the same as that of a CD or DVD, for example. A hole 3b is formed. In this optical disk 3, a predetermined pattern composed of lands and grooves is formed on one surface of a synthetic resin substrate on the signal recording surface 3a side to which the light beam is irradiated, and the light beam is reflected on the predetermined pattern. A signal recording layer made of a phase change material, an organic dye material, or the like is provided on the reflective layer, a light transmission layer is provided on the signal recording layer, and a light beam is irradiated from the light transmission layer side. Data is recorded in the groove. In this optical disc 3, a light beam having a wavelength of about 400 nm is used for recording and / or reproduction, and an objective lens for an optical pickup having a higher numerical aperture than an objective lens used for a CD or DVD is used. Data such as still image data, moving image data, music data, and processing data processed by a computer can be recorded at a higher density. In addition to the above, a magneto-optical disk, a magnetic disk, or the like may be used as the disk.

  As shown in FIG. 3, the disk cartridge 1 is provided with an opening for recording and / or reproduction on the bottom surface of the cartridge body 2 from the front surface to the back surface of the cartridge body 2 so that the recording / reproducing apparatus is mounted. The optical pickup enters from both the front side and the back side of the cartridge body 2 when mounted on the optical disc unit, so that the optical disc can be recorded and reproduced using the two optical pickups, and the information signal Recording and reading can be performed at high speed.

  As shown in FIG. 2, the cartridge main body 2 of such a disk cartridge 1 is composed of an upper shell 6 and a two-divided lower shell 7 that abuts against the upper shell 6. .

  As shown in FIG. 4, the upper shell 6 constituting the upper surface of the cartridge body 2 is formed by injection molding a resin material having thermoplasticity such as acrylonitrile / butadiene / styrene (ABS) or polycarbonate. The upper shell 6 has a substantially arc-shaped front surface on the insertion end side to the recording / 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 front-side pickup entry recess 9a for allowing the first optical pickup on the recording / reproducing apparatus side to enter the central portion on the front side, and the central portion on the rear side. In addition, a first back side pickup entry recess 9b for allowing the second optical pickup to enter is formed.

  Further, on the inner peripheral side of the outer peripheral wall 8, a substantially annular inner peripheral wall 11 constituting a disk storage portion for storing the optical disk 3 in a rotatable manner is provided upright. The inner peripheral wall 11 is formed with a second front-side pickup entry recess 12a for entering a first optical pickup of a recording / reproducing apparatus, which will be described later, in the center on the front side, and at the center on the back side. A second back side pickup entry recess 12b for allowing the second optical pickup to enter is formed in the part. The inner peripheral wall 11 also serves as a side wall of a disc storage portion that stores the optical disc 3 with the inner rotor 4. Further, a rising wall is further provided on the outer peripheral side of the inner peripheral wall 11 so as to surround the inner peripheral wall 11, and a substantially annular guide groove 13 is formed by the inner peripheral wall 11 and the rising wall. The inner rotor 4 is rotatably engaged with the guide groove 13.

  The upper shell 6 is formed with positioning pins 14 for connecting the lower shell 7 in the vicinity of each corner portion. The positioning pins 14 are formed with screw holes for screwing in the center portion. Has been.

  The lower shell 7 coupled to the upper shell 6 configured as described above has shell halves 7a and 7b divided into two as shown in FIGS. The bodies 7 a and 7 b are coupled to the upper shell 6 to constitute the bottom surface of the cartridge body 2. Hereinafter, the shell halves 7a and 7b are collectively referred to as a lower shell 7. The lower shell 7 is formed by injection-molding a resin material having thermoplasticity such as acrylonitrile / butadiene / styrene (ABS) or polycarbonate, like the upper shell 6 described above. Each of the shell halves 7 a and 7 b has a substantially arc shape on the front surface side corresponding to the substantially arc shape on the front surface side of the upper shell 6. In each of the shell halves 7a and 7b, an outer peripheral wall 21 forming a side surface of the cartridge main body is erected along the outer peripheral edge of the main surface. Further, a substantially arc corner wall 24 is erected at each corner portion. The corner wall 24 is located outside the inner peripheral wall 11 of the upper shell 6 when the shell halves 7a and 7b are abutted against the upper shell 6, and prevents entry into the disk storage portion. Further, on one shell half body 7a of the lower shell 7, a support shaft 25 is rotatably provided at a corner portion on the front side so as to rotatably support the lock member.

  The lower shell 7 is formed with a substantially cylindrical positioning recess 22 that is fitted to the positioning pin 14 of the upper shell 6 described above, and a set screw is inserted into the bottom surface of the positioning recess 22. Through-holes are formed. The shell halves 7a and 7b of the upper shell 6 and the lower shell 7 are abutted between the outer peripheral wall 8 on the upper shell 6 side and the outer peripheral walls 21 and 21 of the shell halves 7a and 7b constituting the lower shell 7. The positioning pin 14 on the side and the positioning recess 22 on the lower shell 7 side are fitted, and the cartridge body 2 is joined by screwing a set screw through the through hole of the positioning recess 22 into the screw hole of the positioning pin 14. Constitute. The cartridge body 2 houses an inner rotor 4.

  The first and second optical pickups of the recording / reproducing apparatus and the disk rotation driving mechanism of the recording / reproducing apparatus are disposed between the bottom surface of the cartridge body 2 thus constructed and the shell halves 7a, 7b constituting the lower shell 7. The first opening 23 for recording and / or reproduction into which the disk table constituting the disk enters is formed. In the first opening 23, the front surface side of the cartridge body 2 serves as an opening portion 23a into which the first optical pickup on the recording / reproducing apparatus side enters, and the rear surface side of the cartridge body 2 serves as an opening portion 23b into which the second optical pickup enters. The substantially central portion of the bottom surface of the cartridge main body 2 between the opening 23a and the opening 23b is an opening 23c for driving the disk rotation. That is, the openings 23a and 23b are formed to have a size sufficient to allow the first and second optical pickups of the recording / reproducing apparatus to enter the inside of the cartridge body 2, and the opening 23c for rotational driving is The disk table constituting the disk rotation driving mechanism of the recording / reproducing apparatus is formed to have a size sufficient to enter the inside of the cartridge body 2.

  Further, as shown in FIG. 2, the cartridge main body 2 is provided with a lock member 26 at the front corner portion of one shell half 7 a constituting the lower shell 7. The lock member 26 locks the rotation of the inner rotor 4 when an inner rotor 4 and a pair of shutter members 5a and 5b, which will be described later, are in a closed position where the first opening 23 of the cartridge body 2 is closed. Specifically, the lock member 26 includes a shaft hole 27 that is rotatably engaged with a support shaft 25 that is erected on a front corner portion of one shell half body 7 a of the lower shell 7, and the shaft hole 27. The operation piece 28 extends from the shaft body 27 toward one side surface of the cartridge body 2 and the lock piece 29 extends from the shaft hole 27 toward the inner rotor 4.

  As shown in FIGS. 2 and 5, the operation piece 28 is provided with an operation protrusion 28 a that faces the outside from a lock opening 28 b formed on one side surface of the cartridge body 2, as shown in FIGS. 2 and 5. Further, a lock protrusion 29 a that is in sliding contact with the ring portion 41 of the inner rotor 4 is provided at the tip of the lock piece 29.

  A biasing member 30 such as a torsion coil spring is further attached to the support shaft 25 to which the lock member 26 is attached. The lock member 26 has one arm of the biasing member 30 locked to the outer peripheral wall 21. The other arm is engaged with the lock member 26. As a result, the lock protrusion 29 a is urged to rotate toward the inner rotor 4, and the lock protrusion 29 a is engaged with the second engagement recess 45 of the inner rotor 4. The lock member 26 is moved in a direction in which the lock piece 29 is separated from the ring portion 41 of the inner rotor 4 against the urging force of the urging member 30 when the operation protrusion 28 a of the operation piece 28 is pressed. The lock protrusion 29a is moved and the engagement state with the second engagement recess 45 is released.

  Further, as shown in FIG. 3, a guide groove 31 for preventing erroneous insertion of the disk cartridge 1 into the recording / reproducing apparatus is formed on one side surface of the cartridge body 2 from the front side to the back side. Yes. On the bottom surface of the guide groove 31, in order from the front surface side, a lock opening 28 b that exposes the operation protrusion 28 a of the lock member 26 described above and a part of the outer peripheral portion of the inner rotor 4 are exposed to the outside. A rotor opening 28c is formed.

  As shown in FIG. 2, a guide pin 32 that engages with a guide hole 53 provided in a long hole shape in shutter members 5a and 5b, which will be described later, is formed on the inner surface of the lower shell 7 in a substantially cylindrical shape. . The guide pin 32 moves along the guide hole 53 and rotates the shutter members 5a and 5b when the shutter members 5a and 5b rotate about the shaft holes 50a and 50b as the inner rotor 4 rotates. Let

  As shown in FIG. 3, a plurality of positioning holes 33a and 33b are provided on the lower surface of the cartridge body 2 formed by the lower shell 7 for positioning when the cartridge is mounted on the recording / reproducing apparatus. One positioning hole 33a is a perfect circle as a location hole, and the other positioning hole 33b is an ellipse as an alignment hole. Further, a concave portion 34 having an open front surface and a bottom surface is provided on one corner portion side on the front surface side of the cartridge body 2. It becomes an identification part with a disc cartridge having substantially the same outer shape with different recording formats. Of course, the recess 34 can also function as an insertion guide groove or a positioning groove by engaging a guide pin during insertion into the recording / reproducing apparatus.

  The inner rotor 4 housed in the cartridge body 2 configured as described above is formed by injection molding a resin material having thermoplasticity such as polyoxymethylene (POM), as shown in FIG. . The optical disk 3 is placed on the main surface portion 4a of the inner rotor 4 so that the signal recording surface 3a is opposed. As shown in FIG. 7, when the main surface portion 4a is disposed in the cartridge body 2, the inner peripheral wall 11 and the main surface portion of the upper shell 6 constitute a disk storage portion.

  As shown in FIG. 6, the inner rotor 4 is formed in a substantially circular shape, and a substantially annular ring portion 41 that is engaged with the guide groove 13 of the upper shell 6 described above is formed on the outer peripheral edge portion thereof. Is formed. The inner rotor 4 is rotatably attached to the cartridge body 2 by engaging the ring portion 41 with the guide groove 13 of the upper shell 6.

  As shown in FIG. 6, the inner rotor 4 is formed with a second opening 42 having substantially the same size as the first opening 23 provided in the lower shell 7. The ring portion 41 in the region where the second opening 42 is provided is connected by a connecting portion 41a.

  A gear portion 43 for rotating the inner rotor 4 is formed on the outer peripheral surface of the ring portion 41. As shown in FIG. 8, when the inner rotor 4 is in the closed position of the first opening 23 of the lower shell 7, the gear portion 43 is positioned facing the outside from the front side of the rotor opening 28c described above. 9 and the position where the inner rotor 4 shown in FIG. 9 is at the open position where the first opening 23 of the lower shell 7 is opened, and the position facing the outside from the back side of the rotor opening 28c described above. It is formed over.

  On one side of the gear portion 43, as shown in FIG. 6, a first engaging recess is engaged with a first engaging protrusion of a shutter opening member constituting a shutter opening mechanism on the recording / reproducing apparatus side. 44 is formed, and on the other side of the gear portion 43, a second engagement recess 45 is formed to which the second engagement protrusion of the shutter opening member is engaged. These engaging recesses 44 and 45 face the outside through the rotor opening 28 c together with the gear portion 43. When the disc cartridge 1 is loaded in the recording / reproducing apparatus, the first engaging recess 44 is first engaged with the first engaging protrusion of the shutter opening member as shown in FIG. As shown in FIG. 8, when the shutter members 5a and 5b, which will be described later, are in the closed position, the second engaging recess 45 is engaged with the lock projection 29a of the lock member 26 and the shutter members 5a and 5b. 9 moves to the open position of the first and second openings 23 and 42, the second engaging protrusion of the shutter opening member is engaged as shown in FIG.

  In addition, a pair of rotation restricting protrusions 46 a and 46 b for restricting the amount of rotation of the inner rotor 4 are formed on the outer peripheral surface of the ring portion 41 so as to protrude from each other at a predetermined interval. On the other hand, the upper shell 6 is formed with a pair of restricting portions 47a and 47b that come into contact with the rotation restricting protrusions 46a and 46b. As shown in FIG. 9, when the inner rotor 4 rotates in the direction to open the first opening 23, one rotation restricting protrusion 46 a comes into contact with one restricting portion 47 a, and the inner rotor 4 is further moved. To regulate the rotation.

  When the rotation of the inner rotor 4 in this direction is restricted, as shown in FIG. 9, the inner rotor 4 is in the open position of the first opening 23, and the second opening 42 of the inner rotor 4 and the cartridge The first opening 23 of the main body 2 is substantially aligned. On the other hand, as shown in FIG. 8, when the inner rotor 4 rotates in the direction of closing the first opening 23, the other rotation restricting protrusion 46 b comes into contact with the other restricting portion 47 b, and the inner rotor 4. Regulates further rotation. When the rotation of the inner rotor 4 in this direction is restricted, the inner rotor 4 is in the closed position of the first opening 23, and the second opening 42 of the inner rotor 4 is the first opening of the cartridge body 2. The state is most inclined with respect to the portion 23.

  Further, as shown in FIG. 6, the inner rotor 4 is located on the main surface opposite to the side from which the ring portion 41 protrudes, and a pair of rotatably supporting the pair of shutter members 5 a and 5 b. The support shafts 49a and 49b are formed to protrude. The pair of support shafts 49a and 49b are arranged in a point-symmetrical position with respect to the center portion of the inner rotor 4, that is, with a phase difference of 180 ° from each other.

  The pair of shutter members 5a and 5b for opening and closing the second opening 42 attached to the inner rotor 4 are symmetrical to each other, as shown in FIGS. The support shafts 49a and 49b are rotatably attached with a phase difference of 180 °. In addition, about the equivalent part in a pair of shutter members 5a and 5b, the same code | symbol is attached | subjected and the detail is abbreviate | omitted.

  The shutter members 5a and 5b are formed by injection molding a thermoplastic resin material such as polyoxymethylene (POM), as in the case of the inner rotor 4 described above. The shutter members 5a and 5b are formed in a substantially semicircular flat plate shape, and shaft holes 50a and 50b that are rotatably engaged with the support shafts 49a and 49b of the inner rotor 4 described above at the base end portions. Is formed.

  Further, as shown in FIGS. 10 to 12, the chord line portion that becomes the abutting surface of the pair of shutter members 5a and 5b includes a first engaging portion 51 and a central portion from the central portion toward the base end portion. A second engagement portion 52 is formed from the tip toward the tip. Of these, the first engaging portion 51 has an inclined surface on the lower shell 7 side, and the second engaging portion 52 has an inclined surface on the upper shell 6 side. As shown in FIGS. 11 and 12, the pair of shutter members 5a and 5b are rotated in the direction of approaching and separating from each other about the support shafts 49a and 49b of the inner rotor 4, thereby providing one shutter member 5a. The first engaging portion 51 and the second engaging portion 52 of the other shutter member 5b are engaged, and the first engaging portion 51 of the other shutter member 5b and the one shutter member 5a are engaged. The second engaging portion 52 is engaged.

  Further, as shown in FIGS. 10 to 12, the shutter members 5 a and 5 b are formed with guide holes 53 that are respectively engaged with a pair of guide pins 32 that are formed on the inner surface of the lower shell 7 to be described later. Yes. This guide hole 53 is predetermined toward the shaft holes 50a and 50b from the middle part of the arc line portion so that the shutter members 5a and 5b are rotated between the closed position and the open position of the second opening 42. The length is formed.

  In addition to the above-described configuration, the disc cartridge 1 having the above-described configuration is provided with a clamping plate 61 substantially at the center of the inner surface of the upper shell 6 as shown in FIG. The clamping plate 61 sandwiches the optical disk 3 together with a disk table that constitutes a disk rotation drive unit of the recording / reproducing apparatus, and is attached to the upper shell 6 by an attachment ring 61a. Specifically, the clamping plate 61 is sandwiched between the attachment ring 61a and the substantially central portion of the inner surface of the upper shell 6, and the attachment ring 61a is attached to the substantially central portion of the inner surface of the upper shell 6 by welding or the like. The optical disc 3 is in a state of being rotatable in the disc storage portion 2a when the disc table is engaged with the center hole 3b and further sandwiched between the disc table and the clamping plate 61.

  The method for fixing the shell halves 7a and 7b of the lower shell 7 to the upper shell 6 is not limited to the above-described means such as a set screw, and the upper shell 6 and the lower shell 7 using an adhesive, ultrasonic welding, or the like. The shell halves 7a and 7b can be joined and integrated.

  2 and 3, the cartridge body 2 is provided with an erroneous erasure prevention mechanism 70 for preventing erroneous erasure of information signals recorded on the optical disk 3 at one corner on the back side. . Specifically, as shown in FIGS. 13 and 14, the erroneous erasure prevention mechanism 70 is provided with an arrangement portion 72 in a region surrounded by an outer peripheral wall 8 of the upper shell 6 and a rising peripheral wall 71 continuous with the outer peripheral wall 8. Have In the arrangement portion 72, an erroneous erasure prevention member 73 that is slid by the user is arranged. As shown in FIGS. 3, 15A, and 15B, the disposing portion 72 has a detection hole 74 formed in the lower shell half 7b. The detection hole 74 is a long hole, and is formed such that the long axis direction is the sliding direction of the erroneous erasure preventing member 73. The disposing portion 72 is formed with a substantially rectangular operation hole 75 so as to straddle the outer peripheral wall 8 of the upper shell 6 and the outer peripheral wall 21 of the lower shell half body 7b.

  Furthermore, a guide wall 76 is formed in the arrangement portion 72 along the sliding direction of the erroneous erasure preventing member 73. The guide wall 76 has a first recordable engaging recess 77a for holding the erroneous erasure preventing member 73 at a recordable position on one surface, and an erroneous erasure preventing member 73 at a non-recordable position. The first non-recordable engaging recess 77 b is formed side by side in the sliding direction of the erroneous erasure preventing member 73. The guide wall 76 has a second recordable engagement recess 78a for holding the erroneous erasure preventing member 73 in the recordable position together with the first recordable engagement recess 77a on the other surface. A first non-recordable engaging recess 77 b and a second non-recordable engaging recess 78 b for holding the erroneous erasure preventing member 73 at the non-recordable position are formed side by side in the sliding direction of the erroneous erasure preventing member 73. Yes. The first recordable engagement recess 77a on one surface of the guide wall 76 and the second recordable engagement recess 77a on the other surface are formed in opposite directions across the guide wall 76, and the first One unrecordable engaging recess 77b and the second unrecordable engaging recess 78b on the other side are also formed in opposite directions with the guide wall 76 in between.

  As shown in FIG. 14, the erroneous erasure preventing member 73 arranged in the arrangement portion 72 has a base portion 81. The base portion 81 is formed with a guide groove 82 that engages with the guide wall 76 of the arrangement portion 72. In addition, an operating piece 83 that is exposed to the outside from the operating hole 75 of the arrangement portion 72 is formed on the base body portion 81. The operation piece 83 has a rectangular shape large enough to close the operation hole 75 from the inside, and further has an operation projection 83a for facilitating the slide operation. In addition, the base portion 81 is formed with a detection portion 84 that closes a part of the detection hole 74 formed in the arrangement portion 72. The detection unit 84 is formed in a perfect circle while the detection hole 74 is formed in an oval shape, and closes a part of the detection hole 74. The detection mechanism on the recording and / or reproducing device side can record the disk cartridge 1 by mechanically or optically detecting the position closed or opened by the detection unit 84 in the detection hole 74. It is judged whether it is in a state or in a state where recording is impossible.

  Further, the base portion 81 is formed with a first elastic engagement piece 85 and a second elastic engagement piece 86 which are spaced apart from each other in parallel. The first and second elastic engagement pieces 85 and 86 are formed so that the base end portions are opposite to the sliding direction of the erroneous erasure preventing member 73, and the first and second engagement portions are disposed at the distal end portions. The mating projections 85a and 86a are formed inward.

  As shown in FIGS. 15A and 15B and FIGS. 16A and 16B, the erroneous erasure preventing member 73 configured as described above has a guide wall on the disposing portion 72. 76, the detection portion 84 is exposed to the outside through the detection hole 74, and the operation piece 83 is exposed to the outside from the operation hole 75. FIGS. 15A and 16A show a state in which the erroneous erasure preventing member 73 is at a recordable position. When in the recordable state, the erroneous erasure preventing member 73 is slid in one direction of the arrangement portion 72, that is, in the direction opposite to the arrow X in FIGS. 15 (A) and 16 (A). Is located on one side of the detection hole 74, and the operation projection 83 a of the operation piece 83 is also located on one side of the operation hole 75. At this time, the first and second elastic engagement pieces 85 and 86 have the first and second engagement protrusions 85 a and 85 b of the first and second recordable engagement recesses 77 a of the guide wall 76. , 78a, and the erroneous erasure preventing member 73 is held in a recordable state.

  Then, since the erroneous erasure preventing member 73 switches from the erroneous erasable state to the unrecordable state, the operation piece 83 exposed to the outside through the operation hole 75 is operated, and FIG. 15 (A) and FIG. 16 (A). When slid in the middle arrow X direction, the first and second elastic engagement pieces 85 and 86 are elastically displaced, and the one end and the first and second engagement protrusions 85a and 85b are Ascend between the second recordable engagement recesses 77a, 78a and the first and second record disable engagement recesses 77b, 78b, and then as shown in FIGS. 15 (B) and 16 (B). In addition, the first and second non-recordable engaging recesses 77b and 78b are engaged. As a result, the erroneous erasure preventing member 73 is held at the unrecordable position. In a state where recording is not possible, the detection unit 84 is located on the other side of the detection hole 74, and the operation protrusion 83 a of the operation piece 83 is also located on the other side of the operation hole 75. Further, in order to slide the erroneous erasure prevention member 73 from the non-recordable position to the recordable position, the erroneous erasure prevention member 73 is slid in the direction of the arrow X in FIGS. 15 (B) and 16 (B). The first and second engagement protrusions 85a and 85b move from the first and second non-recordable engagement recesses 77b and 78b to the first and second recordable engagement recesses 77a and 78a.

  In the erroneous erasure prevention mechanism 70 configured as described above, the first elastic engagement piece 85 and the second elastic engagement piece 86 are provided in opposite directions with the guide wall 76 interposed therebetween. Accordingly, one of the first and second engagement protrusions 85a and 85b is formed by the first and second recordable engagement recesses 77a and 78a and the first and second recordable engagement recesses 77b and 78b. One of the above is climbed toward the destination, and at this time, a thrust force is always generated. Thereby, in the erroneous erasure prevention mechanism 70, even when the erroneous erasure prevention member 73 is slid in any direction, since a tensile force is generated at one place, the operation force can be made the same. The operability can be improved. Further, at any of the recordable position and the non-recordable position, the erroneous erasure preventing member 73 includes the first and second recordable engagement recesses 77a and 77b or the first engagement protrusions 85a and 86a. In addition, since it is engaged with the second non-recordable engaging recesses 78a and 78b, the holding force at each position is increased, and even when a large impact is applied due to a drop or the like, an erroneous erasure is caused by the impact. It is possible to prevent the prevention member 73 from sliding. This can prevent the user from erasing the information signal by mistake.

  Before the disc cartridge 1 having the above-described configuration is mounted in the recording / reproducing apparatus, the disc cartridge 1 is in a state as shown in FIGS. In other words, the pair of shutter members 5 a and 5 b are locked at the closed position of the first opening 23 by the lock projection 29 a of the lock member 26 being engaged with the second engagement recess 45 of the inner rotor 4. . At this time, the first engaging recess 44 of the inner rotor 4 is exposed to the outside from the rotor opening 28c, and the operation protrusion 28a of the lock member 26 is exposed to the outside from the locking opening 28b, and recording / reproduction is performed. When loaded in the apparatus, the shutter opening mechanism on the recording / reproducing apparatus side releases the shutter lock, and the pair of shutter members 5a and 5b can be rotated. In this state, the disc cartridge 1 is loaded into the recording / reproducing apparatus.

  Here, the recording / reproducing apparatus is provided with a shutter opening member 90 constituting a shutter opening mechanism for rotating the inner rotor 4 and rotating the shutter members 5a and 5b. As shown in FIG. 18, the shutter opening member 90 includes a rack portion 91 that meshes with the gear portion 43 of the inner rotor 4, and a first engagement for initial operation provided on the front end side of the rack portion 91. A protrusion 92 and a second engaging protrusion 93 for a stopper provided on the base end side of the rack portion 91 are provided. The rack portion 91 has substantially the same number of teeth as the gear portion 43. The first engagement protrusion 92 is provided at the distal end portion of the first elastic piece 94 provided at the distal end side of the rack portion 91, and the second engagement protrusion 93 is provided at the other end side of the rack portion 91. The second elastic piece 95 provided on the front end side of the inner rotor 4 can be reliably engaged with the engaging recesses 41 and 42.

  When the disc cartridge 1 is inserted into the recording / reproducing apparatus with the front surface of a substantially arc as the insertion end, first, the opening operation of the shutter members 5a and 5b starts. That is, as shown in FIG. 19, the shutter opening member 90 is engaged with the guide groove 31 of the disk cartridge 1, and the first engagement protrusion 92 is the locking opening 28 b provided in the guide groove 31. The operation projection 28a of the lock member 26 that is exposed to the outside is pressed. Thereby, the lock member 26 rotates around the support shaft 25, and the engagement state of the lock protrusion 29a with the second engagement recess 45 of the inner rotor 4 is released. As a result, the inner rotor 4 is unlocked and becomes rotatable. Further, when the shutter opening member 90 advances to the front of the disk cartridge 1, the rack portion 91 keeps pressing the operation projection 28 a of the lock member 26, thereby holding the unlocked state of the inner rotor 4.

  Then, as shown in FIG. 20, the first engagement protrusion 92 engages with the first engagement recess 44 exposed to the outside from the rotor opening 28 c of the inner rotor 4, and the inner rotor 4. In a rotatable state, and the shutter opening member 90 advances forward of the disk cartridge 1 to rotate the inner rotor 4. The rack portion 91 of the shutter opening member 90 meshes with the gear portion 43 exposed to the outside through the rotor opening 28c.

  Further, when the shutter opening member 90 advances to the front of the disk cartridge 1, the shutter opening member 90 in which the rack portion 91 is engaged with the gear portion 43 of the inner rotor 4 rotates the inner rotor 4 as shown in FIG. To do. As a result, the guide hole 53 is engaged with the guide pin 32 of the inner rotor 4, and the shutter members 5 a and 5 b that are pivotally supported by the support shafts 49 a and 49 b have the first support shaft 49 a and 49 b as the rotation fulcrums. It rotates in the direction to open the openings 23 and 44.

  When the meshing state between the rack portion 91 of the shutter opening member 90 and the gear portion 43 of the inner rotor 4 is finished, the rotation operation of the shutter members 5a and 5b is stopped as shown in FIG. The second engagement protrusion 93 engages with the second engagement recess 45 of the inner rotor 4. Thus, the shutter members 5a and 5b are held in a state where the first openings 23 and 44 are completely released.

  Thereafter, a disk table constituting a disk rotation driving mechanism enters from the first opening 23b, and this disk table engages with the center hole 3b of the optical disk 3 and clamps the optical disk 3 with the clamping plate 61. Clamp for rotation. Further, the optical pickup enters from the front side and / or the back side from the opened first opening 23 of the disc cartridge 1 mounted in the mounting unit. Here, in the recording / reproducing apparatus, as shown in FIGS. 15A and 15B, whether the erroneous erasure prevention mechanism 70 is in a recordable state depending on the position of the detection unit 84 of the erroneous erasure prevention member 73. Determine whether recording is disabled. The optical disk 3 is rotated by a disk rotation driving mechanism, the signal recording surface 3a is irradiated with the light beam emitted from the optical pickup, and the optical pickup detects the return light beam reflected by the signal recording surface 3a. As a result, data is recorded, and data recorded on the optical disc 3 is read.

  On the other hand, when the disc cartridge 1 is ejected from the recording / reproducing apparatus, for example, the eject button constituting the operation unit of the recording / reproducing apparatus is operated. As a result, the loading mechanism performs the ejection operation, the disk cartridge 1 is ejected, and the shutter opening member 90 described above is relatively retracted from the disk cartridge 1. As the shutter opening member 90 moves backward, the inner rotor 4 and the pair of shutter members 5a and 5b operate in the reverse direction to that of the disk insertion described above, that is, the inner rotor 4 rotates in the other direction, and the pair of shutter members. 5 a and 5 b close the first opening 23 of the cartridge body 2.

  In the disc cartridge 1 configured as described above, as shown in FIGS. 16A and 16B, the erroneous erasure preventing mechanism 70 is replaced with the first elastic engagement piece 85 and the second elastic engagement. The piece 86 is provided in the opposite direction with the guide wall 76 in between. Accordingly, one of the first and second engagement protrusions 85a and 85b is formed by the first and second recordable engagement recesses 77a and 78a and the first and second recordable engagement recesses 77b and 78b. When one of the above is climbed toward the destination, a tensile force is always generated. Thereby, in the erroneous erasure prevention mechanism 70, the operation force can be made the same even when the erroneous erasure prevention member 73 is slid in any direction, and the operability can be improved. Further, at any of the recordable position and the non-recordable position, the erroneous erasure preventing member 73 includes the first and second recordable engagement recesses 77a and 77b or the first engagement protrusions 85a and 86a. In addition, since it is engaged with the second non-recordable engaging recesses 78a and 78b, the holding force at each position is increased, and even when a large impact is applied due to a drop or the like, an erroneous erasure is caused by the impact. It is possible to prevent the prevention member 73 from sliding. This can prevent the user from erasing the information signal by mistake.

  FIG. 23 is a modification of the guide wall 76 of the disposition portion 72 formed in the upper shell 6 of the erroneous erasure prevention mechanism 70. In the guide wall 76 shown in FIG. 23, the side where the first recordable engaging recess 77a and the first recordable engaging recess 77b formed on one surface face each other has a gentle curved surface or slope compared to the opposite side. It is formed by the surfaces 88a and 88b. In addition, the second recordable engagement recess 78a and the second recordable engagement recess 78b formed on the other surface of the guide wall 76 have a gentle curved surface or inclined surface 89a, the opposite sides of which are opposed to each other. It is formed by 89b.

  The gently curved or inclined surfaces 88a and 88b formed in the first recordable engaging recess 77a and the first recordable engaging recess 77b on one surface of the guide wall 76 and the second recording on the other surface. The gentle curved surfaces or inclined surfaces 89a and 89b formed in the usable engaging recess portion 78a and the second non-recordable engaging recess portion 78b both have the first recordable engaging member when the erroneous erasure preventing member 73 is slid. When riding between the joint recess 77a and the first non-recordable engagement recess 77b and between the second recordable engagement recess 78a and the second non-recordable engagement recess 78b, the first and second The first and second engagement protrusions 85a and 86a of the elastic engagement pieces 85 and 86 are the portions that first come into sliding contact. In this example, the first and second engaging protrusions 85a and 86a are firstly brought into sliding contact with each other at the start of sliding by gently curved surfaces or inclined surfaces 88a, 88b, 89a and 89b in any direction. Even when the sliding operation is performed, the erroneous erasure preventing member 73 can be smoothly slid while maintaining the same operating force.

  In the above example, the disk cartridge 1 in which the lower shell 7 is divided into two parts has been described. However, the present invention is also applicable to a disk cartridge that is not divided into two parts as in Patent Document 1 and other known disk cartridges. be able to.

It is the perspective view which looked at the disc cartridge to which the present invention is applied from the upper shell side. 2 is an exploded perspective view of the disk cartridge. FIG. It is the perspective view which looked at the said disk cartridge from the lower shell side. It is a top view of the inner surface side of the upper shell which comprises the said disk cartridge. It is a top view of the inner surface side of the lower shell which comprises the said disk cartridge. It is a perspective view of the inner rotor which comprises the said disk cartridge. It is sectional drawing of the said disk cartridge. It is a top view which shows the state which the said inner rotor obstruct | occluded the opening part of the lower shell. It is a top view which shows the state which the said inner rotor opened the opening part of the lower shell. It is a perspective view of a pair of shutter members. It is a perspective view which shows the state which the shutter part has opened the opening part of the said inner rotor. It is a perspective view which shows the state which the shutter part has obstruct | occluded the opening part of the said inner rotor. It is a principal part top view which shows the arrangement | positioning part of an erroneous erasure prevention mechanism. It is a top view of an erroneous erasure prevention member. It is a principal part top view which shows the position of the detection part of an erroneous erasure prevention mechanism, (A) shows a recordable position, (B) shows a recording impossible position. 4A and 4B are main part plan views showing positions of the first and second elastic engagement pieces of the erroneous erasure prevention mechanism, wherein FIG. 5A shows a recordable position and FIG. It is a top view which shows the cartridge of the state which the said shutter part has obstruct | occluded the opening part of the lower shell. It is a perspective view of the shutter opening member of a recording / reproducing apparatus. It is a top view which shows the open initial state of the said shutter part. It is a top view which shows the state which the rack part of the said shutter release member and the gear part of an inner rotor mesh. It is a top view which shows the state in the middle of the said shutter part opening the opening part. It is a top view which shows the state which the said shutter part open | released the opening part. It is a modification of the guide wall which comprises an erroneous erasure prevention mechanism, and is a principal part top view which shows the recordable position of an erroneous erasure prevention member. It is a principal part top view of the arrangement | positioning part of the erroneous erasure prevention mechanism used for the conventional disc cartridge. It is a top view of the miserase prevention member used for the conventional miserase prevention mechanism. In the conventional erroneous erasure prevention mechanism, it is a principal part top view which shows the erroneous erasure prevention member in a recordable position. In the conventional erroneous erasure prevention mechanism, it is a principal part top view which shows the erroneous erasure prevention member in a recording impossible position.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Disc cartridge 2 Cartridge body 3 Optical disc 4 Inner rotor 5a, 5b Shutter member 6, Upper shell, 7 Lower shell, 7a, 7b Half shell, 8 Outer wall, 11 Inner wall, 13 Guide groove, 21 Outer wall , 32 guide pin, 70 erroneous erasure prevention mechanism, 71 rising peripheral wall, 72 disposition portion, 73 erroneous erasure prevention member, 74 detection hole, 75 operation hole, 76 guide wall, 77a first recordable engagement recess, 77b first 1 non-recordable engaging recess, 78a second recordable engaging recess, 78b second non-recordable engaging recess, 81 base portion, 82 guide groove, 83 operation piece, 83a operation protrusion, 84 detector, 85 1st elastic engagement piece, 85a 1st engagement protrusion, 86 2nd elastic engagement piece, 86a 2nd engagement protrusion, 88a, 88b, 89a, 8 b curved or inclined surfaces

Claims (2)

A cartridge body for rotatably storing a disc on which an information signal can be recorded;
An erroneous erasure prevention mechanism for preventing erroneous erasure of information signals to the disk,
The erroneous erasure prevention mechanism includes an erroneous erasure prevention member that is slidably disposed on the disposition portion in the cartridge body, a detection hole formed in the disposition portion, and the detection hole of the disposition portion. Operating holes formed on different surfaces,
In the arrangement portion, a guide wall formed along the sliding direction of the erroneous erasure preventing member is formed,
The erroneous erasure prevention member includes a first elastic engagement piece that is formed substantially parallel to the guide wall from one side in the sliding direction and has a first engagement protrusion formed on a tip side, and the slide A second elastic engagement piece formed substantially parallel to the guide wall from the other side in the direction and having a second engagement protrusion formed on the tip side, and the first disposition portion on the first portion The elastic engagement piece and the second elastic engagement piece are disposed so as to sandwich the guide wall,
A first recordable engagement that holds the erroneous erasure prevention member that engages and disengages with the first engagement protrusion at a recordable position on a surface of the guide wall on the first elastic engagement piece side. A concave portion and a first non-recording engagement concave portion that holds the erroneous erasure preventing member at a non-recordable position are formed side by side, and the second engagement protrusion is formed on the surface of the second elastic engagement piece. A second recordable engagement recess for holding the erroneous erasure prevention member engaged and disengaged at a recordable position and a second recordable engagement recess for holding the erroneous erasure prevention member at a record impossible position are arranged side by side. A disc cartridge characterized by being formed of   The first recordable engagement recess and the first record disable engagement recess, and the second record enable engagement recess and the second record disable engagement recess are gentler on opposite sides than the opposite side. 2. The disc cartridge according to claim 1, wherein the disc cartridge is formed of a slanted surface or a curved surface.

Images