JP2007141358A - Optical disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly load a disk by preventing a disk from falling downward and turning horizontally when a disk tray is ejected and also preventing vibrations when the disk tray is drawn in. <P>SOLUTION: A guide groove 12 is formed in a clamp support part 11 of a main chassis 1, a guide rib 25 having a slope part 251 and a horizontal part 252 formed in parallel with the top face of the disk tray 2 is formed in the disk tray 2, and the guide rib 25 is engaged with the guide groove 12 while the disk tray 2 is ejected by a fixed amount. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus that reads information recorded on an optical disc or records information on an optical disc, and more particularly relates to an optical disc apparatus that can reduce vibration of a disc tray on which an optical disc is placed, inserted, and ejected. is there.

  In recent years, optical discs such as CDs (Compact Discs) and DVDs (Digital Versatile Discs) are often used as video, audio or information recording media. An optical disc apparatus using these optical discs as a recording medium records data by irradiating the recording surface of the optical disc with laser light, and / or detects the light reflected by the recording surface, thereby reading out the data. Is going.

  Many of the optical disk devices have a disk tray on which the optical disk is placed. The optical disk apparatus places an optical disk on the disk tray, and conveys the disk tray by sliding the disk tray to a predetermined position in the housing of the optical disk apparatus.

  Thereafter, while driving (rotating) the optical disk, the optical head is moved in the radial direction of the optical disk, and laser light is irradiated from the optical head to the optical disk or reflected light is received, thereby recording or reading data. I do.

  In order to eject (unload) the optical disk after data recording or reading is completed, the optical disk is unloaded by sliding it from the inside of the optical disk apparatus to the outside of the optical disk apparatus on the side opposite to the loading side. The

  The housing of the optical disk device is formed by integral molding of resin including the disk tray, and in the case of mass production, a plurality of identical parts are manufactured in parallel using a plurality of molds. It is common. It is difficult to form multiple molds with exactly the same shape, and to match the molding conditions such as molding pressure and molten resin temperature completely, and all the molded products are not necessarily molded with the same dimensions. Not necessarily.

  In order to reduce the sliding friction between the disc tray and the housing, which is caused by the variation in the molding dimensions due to the mass production, the disc tray and the housing are manufactured with play. . When there is play between the disc tray and the housing, the disc tray vibrates when the disc tray is loaded and / or unloaded.

Therefore, in the invention described in Japanese Patent Application Laid-Open No. 2003-331497, an adjustment screw is inserted into a screw guide holder provided on an upper frame member and is supported while guiding the rail side end with the adjustment screw. Yes. In JP 2004-259336 A, a slit is formed on one side portion of the synthetic resin top plate to form an approximately L-shaped presser piece that can be elastically displaced. The tray is prevented from tilting by being elastically contacted.
JP 2003-331497 A JP 2004-259336 A

  However, in the invention described in Japanese Patent Application Laid-Open No. 2003-331497, a plurality of members such as the adjustment screw and the screw guide holder are separately required, and accordingly, the number of parts is increased and the number of manufacturing steps is increased. Becomes higher.

  In addition, in the invention described in Japanese Patent Application Laid-Open No. 2004-259336, a separate member is not necessary, but a slit must be formed and an L-shaped presser piece must be formed, resulting in a complicated operation. Manufacturing and assembly work and time are required, and the manufacturing cost increases accordingly.

  Further, when the disk tray is unloaded, the disk tray stops when a stopper formed on the side surface of the disk tray comes into contact with a contact member formed on the housing. However, the disk tray is driven by a rack formed at a lower portion of the disk tray and a pinion gear that meshes with the rack, and the rack is displaced from the central axis in the sliding direction of the tray. When the disc tray is ejected and stopped, the disc tray swings in a direction along the disc placement surface of the disc tray.

  The inventions described in Japanese Patent Application Laid-Open Nos. 2003-331497 and 2004-259336 suppress tilting and vibration in a direction perpendicular to the disk mounting surface of the disk tray, and a direction along the disk mounting surface. It does not suppress the fluctuation of

  Therefore, the present invention has been made in view of the above problems, and suppresses tilting in a direction perpendicular to the disk mounting surface of the disk tray and deflection in a direction along the disk mounting surface when the disk tray is ejected. An object of the present invention is to provide an optical disk apparatus capable of performing disk loading and disk unloading with high accuracy.

  Therefore, the present invention has been made in view of the above problems, and can smoothly perform disk loading and unloading of a disk tray without adding members or processing into a complicated shape. An object of the present invention is to provide an optical disc apparatus capable of reducing the manufacturing cost.

  In order to achieve the above object, the present invention provides an optical disk apparatus for recording and reading data by irradiating an optical disk with laser light, a main chassis, an optical head for irradiating the optical disk with laser light, A disk rotating device for rotating an optical disk, and a direction in which the optical disk is placed and slidably supported inside the main chassis, moved forward and backward, and inserted or ejected from an opening formed on the front surface of the optical disk apparatus. And a traverse chassis that supports the optical head to be slidable and holds the disk rotating device. An elevating cam that is slidably supported by the main chassis and engages with the tray, and the main chassis A clamp support part that supports a clamp that is formed on the disk and clamps the optical disk between the disk rotating device, a drive motor that is a power source, and the power of the drive motor is supplied to the tray and the optical head. And a gear mechanism for transmitting to the elevating cam, and a gap in which the disk tray slides is formed in the clamp support portion, and the gap slides on the upper surface of the gap. Two guide grooves extending in the moving direction and stoppers protruding from both side surfaces of the gap, and the disc tray is disposed on the back side of the upper surface with a sliding center interposed therebetween, Two guide ribs having a thickness slightly smaller than the width and engaging the guide groove when the disc tray protrudes a predetermined amount from the opening, and the disc tray is opened on both side surfaces. The guide groove has a drawing portion having a shape that expands toward the back side in the sliding direction of the disc tray, and the guide rib. Has an inclined portion whose opening side forms a predetermined angle with the upper surface of the disk tray, and a horizontal portion that is continuous with the inclined portion and is formed in parallel with the upper surface of the disk tray and abuts on the upper surface of the guide groove. The guide rib and the guide groove engage and slide in a state where the tip of the disc tray protrudes from the opening by a certain length or more and a moment due to gravity centered on the opening is applied to the disc tray. It is characterized by that.

  According to this configuration, when the disc tray slides for loading and unloading, the guide rib engages with the guide groove and slides, so that the disc tray and / or the optical disc has its own weight. It is possible to suppress sagging due to the generated moment.

  Since the disc tray can be prevented from dripping, it is possible to prevent the disc tray from swinging when the disc tray slides in the loading direction.

  Further, when the disc tray is unloaded, when the abutting portion of the disc tray comes into contact with the stopper formed in the gap of the main chassis, a moment for the disc tray to rotate in the horizontal direction, When the inner side surface of the guide groove and the side surface of the guide rib are in contact with each other, a drag can be generated and rotation can be suppressed.

  Further, since the guide rib has an inclined portion on the opening side and a horizontal portion provided integrally with the inclined portion, the guide rib is guided to the guide groove when the disc tray is unloaded. The impact can be reduced when inserting into the battery, and the unloading can be performed smoothly.

  In addition, since the guide groove is formed with a lead-in portion that becomes larger toward the back side of the slide of the disk tray, even if the center of the guide rib and the guide groove is shifted during the slide of the disk tray, The guide rib can be accurately drawn into the guide groove, and the disc tray can always be unloaded at a fixed position.

  In order to achieve the above object, the present invention provides an optical disk apparatus for recording and reading data by irradiating an optical disk with a laser beam, and is slidably supported within the main chassis and the main chassis. The optical disk is placed, moved forward and backward, inserted or ejected from an opening formed on the front surface of the optical disk apparatus, and loaded or unloaded on the optical disk, and rotatably supported by the case, An optical head that irradiates an optical disk with laser light, a traverse chassis that holds a disk rotating device that rotates the optical disk, and a main chassis, and the optical disk is sandwiched between the disk rotating device A clamp support part for supporting the clamp to be operated, and the disc tray slides on the clamp support part. A gap is formed on the inner upper surface, the guide rib is engaged with the guide rib and extends in the sliding direction of the disc tray, and stoppers formed on both inner sides of the gap. The disc tray has one or a plurality of guide ribs arranged on the back side of the upper surface with a sliding center in between, and the stopper when the disc tray stops on the discharge side on both sides. And an abutting portion that abuts against each other.

  According to this configuration, when the disc tray slides for loading and unloading, the guide rib engages with the guide groove and slides, so that the disc tray and / or the optical disc has its own weight. It is possible to suppress sagging due to the generated moment.

  Since the disc tray can be prevented from dripping, it is possible to prevent the disc tray from swinging when the disc tray slides in the loading direction.

  Further, when the disc tray is unloaded, when the abutting portion of the disc tray comes into contact with the stopper formed in the gap of the main chassis, a moment for the disc tray to rotate in the horizontal direction, When the inner side surface of the guide groove and the side surface of the guide rib are in contact with each other, a drag can be generated and rotation can be suppressed.

  According to this configuration, by forming a bent portion on the side rail of the disc tray, when the disc tray has slid to the unload position, the bent portion comes into contact with the press portion of the main chassis. It is possible to suppress the disk tray from sagging.

  Since the disc tray can be prevented from dripping, it is possible to prevent the disc tray from swinging when the disc tray slides in the loading direction.

  In the above configuration, the guide rib may engage with the guide groove and slide when the tip end portion of the disc tray is discharged from the opening by a certain amount or more. An inclined portion having an inclined surface forming a predetermined angle with respect to the upper surface of the disc tray on the side, and a horizontal portion formed in parallel with the upper surface of the disc tray may be provided.

  According to the present invention, when a disc tray is ejected, tilting in a direction perpendicular to the disc placement surface of the disc tray and fluctuation in a direction along the disc placement surface are suppressed, and disc loading and disc unloading are performed with high accuracy. It is possible to provide an optical disc device that can be used.

  Further, according to the present invention, the optical disc apparatus can smoothly perform disc loading and unloading of the disc tray and can reduce the manufacturing cost without adding a member or processing into a complicated shape. Can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view of an optical disc apparatus according to the present invention. As shown in FIG. 1, the optical disc apparatus A is arranged so that the disc tray 2 can enter and exit from a slit-shaped entrance / exit St provided in the front panel Fp of the outer housing Oh.

  The optical disc is placed in a state where the disc tray 2 is ejected from the optical disc apparatus A through the entrance / exit St, and the disc tray 2 is inserted to insert (load) the optical disc into a playable / recordable area. Further, by ejecting the disc tray 2 from the optical disc apparatus A, the optical disc inserted in the optical disc apparatus A is ejected (unloaded).

  2 is a plan view of a state in which the tray of an example of the optical disc apparatus according to the present invention is ejected, FIG. 3 is a plan view of a state in which the tray of the optical disc apparatus shown in FIG. 2 is accommodated, and FIG. 2 is a side view of a disc tray provided in the optical disc apparatus shown in FIG. 2, and FIG. 5 is a side view of the disc tray provided in the optical disc device shown in FIG.

  An optical disk apparatus A shown in FIGS. 2 and 3 reads information and / or records information by irradiating a laser beam onto the main chassis 1, a disk tray 2 slidably supported on the main chassis 1, and the optical disk. An optical head 3, a traverse chassis 4 that supports a disk rotating device that rotatably holds the optical head 3 and the optical disk, and a lifting cam 5 that is slidably supported by the main chassis 1 and connected to the traverse chassis 4. And a drive motor 6 for driving the disc tray 2 and the lift cam 5 and a gear mechanism 7 for transmitting the power of the drive motor 6 to the disc tray 2 and the lift cam 5.

  The main chassis 1 has a clamp support portion 11 on which a disc rotating device and a clamp for holding an optical disc are arranged on the opposite side of the disc tray 2 where the traverse chassis 4 is arranged. The clamp support portion 11 has a gap 110 for sliding the disk tray 2, and a guide groove 12 is formed on the inner surface of the gap 110 to be engaged with a later-described guide rib 25 of the disk tray 2.

  The disc tray 2 has a rack 21 that meshes with a gear 73 (described later) on the bottom surface, a circular step 22 for placing the optical disc, and a laser beam from the optical head 3 is transmitted through the central portion. Through the hole 23 for approaching the clamp 8, a guide 24 that can slide relative to a sliding boss 53 formed on a support portion 51 of a lifting cam 5 described later on the bottom surface, and the main chassis 1 on both side surfaces. A guide rib 25 that engages with the guide groove 12 and guides the sliding of the disc tray 2 is formed.

  The guide 24 has a straight portion 241 extending from the end of the disc tray 2 in the sliding direction of the disc tray 2, a skewed portion 242 that bends obliquely at a predetermined position, and an orthogonal shape that bends so as to be perpendicular to the sliding direction. Part 243.

  As shown in FIGS. 4 and 5, guide ribs 25 are formed on the upper surface of the disc tray 2. The guide ribs 25 are formed at the end on the back side of the disc tray 2 but are not limited thereto, but are formed side by side in a direction orthogonal to the sliding direction here. The guide rib 25 has an inclined portion 251 having a gentle inclination on the front side, and a horizontal portion 252 formed on the rear side in parallel with the upper surface of the disc tray 2.

  When the disc tray 2 is ejected more than a certain amount and the weight of the portion ejected from the entrance / exit St of the disc tray 2 becomes heavier than the weight of the portion remaining inside, the disc tray 2 hangs around the end on the entrance / exit St side Moment is applied.

  FIG. 6 is an enlarged cross-sectional view of guide ribs and guide grooves of the optical disc apparatus shown in FIG. The guide rib 25 and the guide groove 12 are formed so that the guide rib 25 engages with the guide groove 12 as shown in FIG. When the disc tray 2 is moved in the unloading direction, the guide rib 25 formed on the upper surface of the disc tray 2 engages with the guide groove 12 when a moment is applied in a direction in which the disc tray 2 hangs around the doorway St. . As a result, the horizontal portion 252 of the guide rib 25 comes into contact with the bottom 121 of the guide groove 12 (the bottom surface side of the clamp support portion 11), and stops or slides in a state where a resistance against a moment due to weight is generated. Thereby, it is possible to prevent the disk tray 2 from drooping when the disk tray 2 is at the disk discharge position.

  When the disc tray 2 slides in the loading direction, the guide rib 25 and the guide groove 12 are separated from each other when the moment at which the disc tray 2 rotates in the direction in which the leading end 20 hangs against the disc tray 2 does not work. .

  When the disc tray 2 is inserted into the main chassis 1, the guide rib 25 of the disc tray 2 is pressed against the guide groove 12 of the main chassis 1, so that the tip of the disc tray 2 is moved when the disc tray 2 slides. It is possible to prevent the portion 20 from dripping, and to suppress the tip portion 20 from vibrating (swinging) when the disc tray 2 is inserted.

  As shown in FIGS. 2 and 3, a stopper 13 is provided on a portion of the inner surface of the gap 110 of the main chassis 1 facing the side surface of the disk tray 2. A contact portion 26 for contacting the stopper 13 is formed on the side surface of the disc tray 2. When the disc tray 2 slides in the unloading direction and protrudes most from the entrance / exit St, the contact portion 26 of the disc tray 2 comes into contact with the stopper 13 and the disc tray 2 stops. At this time, the load of the drive motor 6 changes, and when the change is detected, the drive motor 6 stops and unloading is completed.

  At this time, the rack 21 of the disc tray 2 is arranged so as to be shifted from the center of the disc tray 2 in the sliding direction, and the stopper 13 formed on both sides of the gap 110 and the contact formed on both sides of the disc tray 2. Since the positions of the portions 26 are formed so that they can play with each other, when the stopper 13 and the abutting portion 26 on the side where the rack 21 is formed abut, the tip end portion 20 is in contact with the stopper 13 and the abutting portion 26. A moment that rotates in the direction in which the rack 21 is arranged around the abutting portion is applied. At this time, since the guide rib 25 of the disc tray 2 is engaged, the side portion of the guide groove 12 presses the guide rib 25, generates a resistance against a moment to rotate toward the rack 21, and rotates. To prevent.

  The optical head 3 has a base 31 and an act base 32 fixed to the base 31. The base 31 includes a laser light source (not shown) that emits laser light, and a collimator lens (not shown) that converts the laser light into parallel light. The act base 32 is provided with an objective lens 33 for condensing the laser beam on the recording surface of the optical disk. The base 31 is slidably supported by the traverse chassis 4, and the base 31 slides in the radial direction of the optical disc when reading data from the optical disc.

  The traverse chassis 4 engages with the main chassis 1 so as to be rotatable, a through hole 42 for preventing the optical head 3 from sliding, an optical head support 43, and a lift cam 5 to be described later. And a lifting boss 44 that engages with the crank portion 52 that engages.

  The elevating cam 5 is formed on a side opposite to the main chassis 1 of the support portion 51, a support portion 51 that is slidably supported by the main chassis 1, a crank portion 52 that engages with the elevating boss 44 of the traverse chassis 4, and a disc tray. A rack 511 is formed at the end of the support portion 51 of the elevating cam 5 having a sliding boss 53 that engages with the two guides 24. The crank portion 52 of the elevating cam 5 has an upper end portion 521, a lower end portion 522, and an inclined portion 523, and the upper end portion 521 and the lower end portion 522 are connected via the inclined portion 523.

  A worm gear 61 is attached to the rotating shaft of the drive motor 6, meshed with the gear 71, and transmits the power of the drive motor 6 to the gear mechanism 7. The gear mechanism 7 has gears 70, 71, 72, 73, and the gears 70, 71, 72, 73 are rotatably supported by the main chassis 1 so as to mesh with each other. When the drive motor 6 rotates, power is transmitted through the worm gear 61, and the gears 70, 71, 72, 73 rotate in predetermined directions.

  The disk rotating device includes a turntable that clamps the optical disk by being pressed against the clamp 8 and an axial motor (not shown) for rotating the turntable.

  FIG. 7 shows an enlarged view of an example of the guide groove shown in FIG. The guide groove 12 shown in FIG. 7 is a view of the clamp support portion 11 as viewed from the gap 110 side. The guide groove 12 has a width T slightly larger than the thickness t of the guide rib 25 formed on the upper surface of the disc tray 2. The guide groove 12 is formed to extend in the sliding direction of the disk tray 2. When the disc tray 2 slides, contact between the guide groove 12 and the guide rib 25 can be suppressed, and loss due to friction can be reduced. Even when the position of the guide rib 25 and the position of the guide groove 12 are slightly shifted, the guide rib 25 is inserted into the guide groove 12, so that the disc tray 2 can be slid with high accuracy.

  The guide rib 25 of the disc tray 2 engages with the guide groove 12 in a state where the disc tray 2 is unloaded to a predetermined position. The disc tray 2 tends to move in the direction in which the front end 20 on the front side hangs down. That is, the guide rib 25 is inserted into the guide groove 12 in a slightly inclined state. At this time, the guide groove 12 and the inclined portion 251 of the guide rib 25 first contact each other and slide while contacting with the inclination of the inclined portion 251, so that the impact when the guide rib 25 is inserted into the guide groove 12 is affected. Can be suppressed.

  FIG. 8 is an enlarged view of another example of a guide groove provided in the optical disc apparatus shown in FIG. As shown in FIG. 8, a tapered lead-in portion 120 is formed on the inner side of the main chassis 1 in the guide groove 12. Other than that, it has the same structure as the guide groove 12 shown in FIG.

  Since the guide groove 12 is formed in the clamp support portion 11 of the main chassis 1, the guide groove 12 and the guide rib 25 are separated from each other when the disc tray 2 is loaded. When unloading, the guide rib 25 is inserted into the guide groove 12 when the disc tray 2 reaches a predetermined position. Since the lead-in portion 120 of the guide groove 12 is formed in a taper shape, even if the center of the guide rib 25 and the center of the guide groove 12 are deviated to some extent, the portion where the guide rib 25 is formed in the taper shape of the lead-in portion 120. And slides in contact with and is guided to the correct position.

  In the above embodiment, the guide groove 12 and the two guide ribs 25 are formed as an example. However, the embodiment is not limited thereto, and the rotation of the disk tray 2 during unloading is suppressed. Can be widely adopted.

  The present invention can be applied to an optical disc apparatus using an optical disc such as a DVD or CD as a recording medium.

1 is a schematic perspective view of an optical disc apparatus according to the present invention. It is a top view in the state where the tray of an example of the optical disk device concerning the present invention was discharged. FIG. 3 is a plan view showing a state in which a tray of the optical disc apparatus shown in FIG. 2 is stored. FIG. 3 is a side view of a disc tray provided in the optical disc apparatus shown in FIG. 2. FIG. 4 is a side view of a disc tray provided in the optical disc apparatus shown in FIG. 3. FIG. 3 is an enlarged cross-sectional view of guide ribs and guide grooves of the optical disc apparatus shown in FIG. 2. The enlarged view of an example of the guide groove shown in FIG. 6 is shown. FIG. 5 is an enlarged view of another example of guide grooves provided in the optical disc apparatus shown in FIG. 2.

Explanation of symbols

A Optical disc apparatus St Entrance / exit Oh External housing Fp Front panel 1 Main chassis 11 Clamp support portion 12 Guide groove 120 Retraction portion 121 Bottom portion 2 Disc tray 21 Rack 22 Step 23 Through hole 24 Guide 25 Guide rib 251 Inclination portion 252 Horizontal portion 3 Optical head 31 Base 32 Act base 33 Objective lens 4 Traverse chassis 41 Engaging convex portion 42 Through hole 43 Optical head support portion 44 Lifting boss 5 Lifting cam 51 Supporting portion 511 Rack 52 Crank portion 53 Sliding boss 6 Motor 61 Warm gear 7 Gear mechanism 8 Clamp

Claims (5)

An optical disc apparatus that records and reads data by irradiating an optical disc with laser light,
A main chassis; an optical head for irradiating the optical disk with laser light; a disk rotating device for rotating the optical disk; and a slidably supported inside the main chassis for placing and moving the optical disk forward and backward. It slides in the direction to be inserted or ejected from the opening formed in the front of the apparatus, and is loaded on and unloaded from the optical disk, and is rotatably supported by the main chassis, and slides the optical head. A traverse chassis that supports the disc rotation device, and a lift cam that is slidably supported by the main chassis and engages with the tray; and the optical disc formed on the main chassis. A clamp support portion for supporting a clamp sandwiched between the disc rotating device and a power source And dynamic motor, the power of the drive motor tray, has a gear mechanism for transmitting to the optical head and the lifting cam,
A gap for sliding the disc tray is formed in the clamp support portion, and the gap protrudes from the upper surface of the gap in two guide grooves extending in the sliding direction of the disc tray, and from both side surfaces of the gap. And a stopper to
The disc tray is disposed on the back side of the upper surface with a sliding center interposed therebetween, has a thickness slightly smaller than the width of the guide groove, and the disc tray protrudes by a predetermined amount from the opening. Two guide ribs that engage with the guide groove, and a contact portion that contacts the stopper when the disc tray is ejected from the opening and stopped on both side surfaces,
The guide groove has a lead-in portion having a shape that widens toward the back side in the sliding direction of the disc tray,
The guide rib includes an inclined portion whose opening side forms a predetermined angle with the upper surface of the disc tray, and a horizontal portion that is continuous with the inclined portion and is formed in parallel with the upper surface of the disc tray and abuts on the upper surface of the guide groove. Have
The guide rib and the guide groove engage and slide in a state in which the tip of the disc tray protrudes from the opening by a certain length or more and a moment due to gravity centered on the opening is applied to the disc tray. An optical disc apparatus characterized by the above. An optical disc apparatus that records and reads data by irradiating an optical disc with laser light,
A main chassis and a slidable support inside the main chassis are placed on the optical disk, moved forward and backward, inserted or ejected from an opening formed on the front surface of the optical disk apparatus, and the optical disk is loaded or unloaded. Formed on the main chassis, a disk tray, a traverse chassis that is rotatably supported by the case, and holds an optical head that irradiates the optical disk with laser light, a disk rotating device that rotates the optical disk, and the main chassis. And a clamp support part for supporting a clamp for sandwiching the optical disk with the disk rotating device,
A gap for sliding the disk tray is formed in the clamp support portion, and the gap engages with the guide rib on the inner upper surface and extends in the sliding direction of the disk tray, Stoppers formed on both inner side surfaces of the gap,
The disc tray has one or a plurality of guide ribs arranged on the back side of the upper surface with a sliding center in between, and abutting on both sides to come into contact with the stopper when the disc tray stops on the discharge side. An optical disc device comprising:   4. The optical disc apparatus according to claim 3, wherein the guide rib engages with the guide groove when the leading end of the disc tray is discharged from the opening by a certain amount or more.   2. The guide rib according to claim 1, wherein the guide rib includes an inclined portion having an inclined surface having a predetermined angle with respect to the upper surface of the disc tray on the opening side, and a horizontal portion formed parallel to the upper surface of the disc tray. An optical disc apparatus according to claim 2 or claim 3.   5. The optical disk apparatus according to claim 2, wherein the guide groove has a lead-in portion having a shape that expands toward the back side in the sliding direction of the disk tray.

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