JP2010262704A - Optical disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk drive having an effect to suppress a contact vibration of a rack slide by a rotation primary vibration of an optical disk by backlash approach of the rack slide without increasing take-out failure of a disk tray and a fluid sound. <P>SOLUTION: In an optical disk drive 100 in which a disk tray 7 is taken out to the outside or carried in to the inside of a casing 16 using a transfer mechanism comprising a guide rail 3 attached to the casing 16 and a rack slide 1 which supports the disk tray 7, the transfer mechanism is configured to have a structure of adsorbing the guide rail 3 and rack slide 1 using a sucking force of a permanent magnet 4 and ferromagnetic material 2 or among the permanent magnets 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a disk tray type optical disk apparatus, and more particularly to a technique for reducing contact vibration between components due to rotational primary swing vibration during disk rotation and vibration noise associated therewith. The present invention also relates to a technique for preventing an increase in internal fluid sound of a disk tray type optical disk apparatus.

  In recent years, the recording capacity of optical disks such as CD, DVD, and BD has been increasing. Data of 25 GB can be recorded on one side of the BD, and 50 GB can be recorded on two layers. Along with this, in order to realize data reading or writing at high speed, an optical disk device for recording / reproducing data on an optical disk is required to have a higher disk rotation speed.

  In the optical disk apparatus described above, an increase in mechanical vibration accompanying an increase in the disk rotation speed adversely affects recording / reproduction performance on a high-density optical disk recording surface, and there is a problem of increasing vibration noise. In particular, in an optical disc apparatus in which a portion (hereinafter referred to as a disc tray) on which an optical disc drive mechanism and a recording / reproducing mechanism are mounted can be freely inserted into and removed from the housing portion of the optical disc apparatus, contact vibration due to backlash of the disc tray transport mechanism is generated. It becomes a more serious problem. This vibration does not appear when the optical disk device is operated alone, but when the optical disk device is assembled to a PC or the like, it may occur due to the looseness of the disc tray transport mechanism and the form of vibration depending on the assembly method. There is.

  As a solution to such a problem, Patent Document 1 discloses a disk tray or a disk tray transport means by a pressing force by an elastic member attached in a direction perpendicular to the transport direction of the disk tray (drawer 2). There has been proposed a method of suppressing the vibration of the disc tray by pressing the rack slide (slide rails 6a and 6b).

JP 2008-117432 A

  Contact vibration, so-called chatter noise, may occur due to minute play of the rack slide that is not directly pressed. In order to suppress chatter noise, it is effective to apply a predetermined pressing force to the rack slide. However, as shown in Patent Document 1, when the sliding surface of a movable part such as a rack slide is pressed with an elastic member, the friction load resistance during loading / unloading of the disk tray increases, and the contact / There is a risk that the life of the sliding surface will be shortened, damaged, the feeling of use will be deteriorated, and the disc tray will not be carried out properly.

  Further, if an excessive pressing force acts on the disc tray due to the pressing, there is a possibility that the components such as the disc tray are deformed. Due to the deformation of the disc tray and the change in position when the disc tray is carried in due to backlash (pushing to one side), the air flow path inside the housing changes when the optical disc rotates, and the gap between the parts changes. Pressure fluctuation occurs in the gap and noise increases.

  Furthermore, when trying to press the optimal position to suppress disc tray vibration and chatter noise, the elastic member protrudes from the guide rail sliding surface in the above method, and there is no contact interference with other parts. A design that takes these into consideration is necessary.

  In view of the above-described problems, the object of the present invention is to reduce vibrations and racks of a disk tray without deteriorating the service life, damage or deterioration of the feeling of parts when moving the disk tray in and out, and without deteriorating the noise performance. An object of the present invention is to provide an optical disc apparatus that can suppress the chatter noise of a slide and can be easily designed.

A feature of the present invention that achieves the above object is that a housing formed of a top cover and a bottom cover, a spindle motor that is mounted with an optical disk and driven to rotate, and information on the recording surface of the optical disk are reproduced or new information is recorded In an optical disc apparatus provided with a disc tray equipped with a pickup for recording and a transport mechanism for carrying out the disc tray to the outside of the housing or carrying it into the housing,
The transport mechanism includes a guide rail attached to the housing and a rack slide that supports the disc tray in a movable manner and moves while being guided by the guide rail, and the disc tray is carried into the housing. Sometimes, a magnetic means composed of a permanent magnet and a ferromagnetic material, or permanent magnets is provided to press the rack slide against the guide rail.

  The rack slide includes at least one permanent magnet, and the guide rail includes a permanent magnet or a ferromagnetic body paired with the permanent magnet, the permanent magnet and the ferromagnetic body, or The permanent magnets may be attached to positions facing each other when the disk tray is carried into the housing.

  Further, at least one ferromagnetic body is provided in a part of the rack slide, and a permanent magnet that is paired with the ferromagnetic body is provided in a part of the guide rail, the ferromagnetic body and the permanent magnet being the disk. It is good also as a structure attached to the position which opposes at the time of carrying in in the said housing | casing of a tray.

  Further, the permanent magnet and the ferromagnetic material, or the permanent magnets may have a structure that exerts a magnetic force that attracts or repels the guide rail and the rack slide only when the disk tray is carried into the housing. .

  The permanent magnet or the ferromagnetic material installed on the guide rail may be embedded in the guide rail so as not to contact the rack slide.

  A first ferromagnetic member attached to the guide rail in contact with one pole of the permanent magnet, and an end on the opposite side of the rack slide with respect to the other pole of the permanent magnet A second ferromagnetic member attached to the disk tray so as to have the first ferromagnetic member and the second ferromagnetic member only when the disk tray is carried into the housing. It is good also as a structure which forms a magnetic circuit in contact or proximity | contact.

  Further, when the disk tray is carried into the casing, a magnetic circuit is formed by the permanent magnet and the ferromagnetic material, or the permanent magnets, and the magnetic force attracted or repelled may be increased.

  Further, the permanent magnet and the ferromagnetic material, or the permanent magnets are surfaces of the disk tray, and press the rack slide against the guide rail in a direction in which the surface of the region facing the mounted optical disk is separated from the optical disk. It is good also as a structure installed in the predetermined position.

  Further, assuming that the direction in which the disk tray is carried out from the inside of the housing is the front, the ferromagnetic body and the permanent magnet are installed behind the center of the spindle motor when viewed from the rotation axis direction of the spindle motor. It is desirable to have a structured.

  According to the present invention, when the disc tray is carried into the housing, the structure is such that the rack slide is pressed against the guide rail by applying an attractive force or a repulsive force due to a magnetic force. Thereby, there is no deterioration of disk tray carrying-in / out performance (usability), and the contact vibration and noise of the rack slide can be suppressed. In addition, the magnetic circuit is configured when the attractive force due to the magnetic force is generated, so that the leakage magnetic flux can be reduced and the magnetic force of the permanent magnet can be effectively applied.

1 is an exploded perspective view showing a configuration of an optical disc apparatus according to Embodiment 1 of the present invention. The perspective view which similarly shows the structure of a conveyance mechanism. The schematic diagram showing the cross section of a conveyance mechanism similarly. The lower perspective view which shows the disc tray and conveyance mechanism of this invention Example 2. FIG. The schematic diagram showing the cross section of a disk tray and a conveyance mechanism similarly. The top view of the optical disk apparatus at the time of top cover removal of Example 3 of this invention. The schematic diagram when a disk tray, a unit mechanism, and an optical disk are similarly mounted.

  Hereinafter, each embodiment will be described with reference to the drawings.

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view showing a configuration of an optical disc apparatus 100 according to an embodiment of the present invention. FIG. 2 is a perspective view showing the transport mechanism 20 of the disc tray 7. 2A shows a state in which the disk tray 7 is carried into the housing 16, and FIG. 2B shows a state in which the rack slide 1a and the guide rail 3a have the disk tray 7 carried out to the outside of the housing 16. Represents the position. FIG. 3 is a schematic diagram showing a cross section of the transport mechanism 20a of the disc tray 7 on the surface P shown in FIG. Here, the direction in which the disc tray 7 is carried out from the inside of the housing 16 to the outside is defined as the front, and the opposite direction is defined as the rear.

  The bottom cover 14 and the top cover 15 formed by press-molding a thin metal plate are combined to form a housing 16. The disk tray 7 is supported by the guide rail 3 attached to the inside of the bottom cover 14 via the rack slide 1, and the rack slide 1 and the disk tray 7 are slidable in the rail direction of the guide rail 3. It has become. The disk tray 7 includes three insulators (not shown) including a spindle motor 10 that is mounted with an optical disk and rotationally driven, and a unit mechanism 8 that is mounted with a pickup 9 that reproduces information on the optical disk recording surface or records information on the recording surface. Is attached through. A bezel 12 is attached to the front of the disk tray 7 as a lid in front of the housing 16 when the disk tray 7 is carried into the housing 16, and a switch 11 is attached to the front thereof.

  Further, a disc tray pushing mechanism 13 is attached to the disc tray 7. The disc tray push-out mechanism 13 can be pushed forward, and when pushed, an elastic body (not shown) inside the disc tray push-out mechanism 13 contracts from its natural length. The reproduction of information recorded on the optical disc and the recording of information are performed when the disc tray 7 is carried into a predetermined carry-in position inside the housing 16, and during that time, the disc tray 7 is placed in the housing by a lock mechanism (not shown). 16 Locked to prevent unloading. At that time, the disc tray extrusion mechanism 13 is pushed in by the bottom cover 14 and is fixed in a state where the elastic body inside the disc tray extrusion mechanism 13 is contracted.

  When the disc tray 7 is carried out of the housing 16 in order to remove the optical disc from the spindle motor 10, a signal when the switch 11 is pressed or an eject command is issued from an external connection device (not shown). Is detected by a CPU (Central processing Unit) (not shown), and the lock is released by issuing an unlock command to the lock mechanism. Then, the disc tray 7 is carried out to the outside of the housing 16 by a force that returns the natural length from the contracted state of the elastic body inside the disc tray pushing mechanism 13.

  On the contrary, when the disc tray 7 is carried into the housing 16 from the outside of the housing 16, if the disc tray 7 is manually carried to the loading position which is the optical disk recording / reproducing position inside the housing 16, a latch mechanism (not shown) Thus, the lock mechanism is activated, and the movement of the disc tray 7 is locked.

  The rack slide 1 is provided with a certain gap (play) with respect to the guide rail 3 and the disk tray 7 for smooth sliding. However, at the time of recording / reproducing the optical disc, a rotation primary swing vibration is generated due to the unbalance of the optical disc itself. For this reason, if the rack slide 1 is not rattled with an appropriate force in a direction perpendicular to the sliding direction, contact vibration with surrounding parts, so-called rattle vibration, is generated, and noise performance is significantly deteriorated. In particular, due to the recent demand for high-speed rotation of optical discs, run-out vibration due to disc imbalance tends to increase, and the pressing force of backlash for suppressing backlash vibration of the rack slide 1 must be large to some extent.

  However, if a strong pressing is performed by a conventional pressing means using an elastic member, the frictional force in the sliding direction of the rack slide 1 increases, causing a problem that the disk tray 7 is not smoothly conveyed. Further, when the disc tray 7 is deformed by excessive pressure, unexpected noise performance degradation may occur due to changes in the flow path of the internal air.

  In order to solve this problem, the optical disk apparatus 100 according to the present embodiment is equipped with a rattling mechanism as shown in detail in FIG. That is, a ferromagnetic body 2 (2a) as a magnetic means is attached to a part of a rack slide 1 (1a) which is a non-magnetic body, and a permanent magnet 4 (4a) as a magnetic means is attached to the guide rail 3 (3a). ) And the disk tray 7 is carried into the housing 16, the ferromagnetic material 2 and the permanent magnet 4 face each other as shown in FIG. When 1 slides, the ferromagnetic body 2 and the permanent magnet 4 are arranged so as not to face each other as shown in FIG.

  Therefore, only when the disk tray 7 is carried into the housing 16, the ferromagnetic body 2 and the permanent magnet 4 face each other to generate a strong attractive force due to the magnetic force, and the attractive force causes the rack slide 1 to move to the guide rail 3. It is attracted to the side and pressed, and is rattled downward. Further, when the rack slide 1 is slid, the ferromagnetic material 2 and the permanent magnet 4 are not opposed to each other, so that the attractive force due to the magnetic force becomes very small and the conveyance of the disk tray 7 is hindered by friction or the like. It can operate smoothly without any problems. For this reason, the pressing force sufficient to suppress the rattling vibration of the rack slide 1 without impairing the movement performance (use feeling) at the time of loading / unloading the disk tray 7 and without reducing the life or damage of the parts. Obtainable.

  Although not shown, the ferromagnetic member 2b and the permanent magnet 4b are also attached to the rack slide 1b and the guide rail 3b in FIG. 1 with the same configuration as in FIG. However, the structure may be such that the ferromagnetic member and the permanent magnet are attached only to the conveyance mechanism on one side. Moreover, it is good also as a structure which attaches multiple ferromagnetic members and permanent magnets with respect to the conveyance mechanism of one side.

  Further, when pressing using an elastic body as in the prior art, in order to eliminate the deterioration of the unloading performance of the disk tray 7, the force by which the disk tray pushing mechanism 13 pushes the disk tray 7 when the disk tray 7 is unloaded is a pressing portion. Therefore, an elastic force larger than the maximum static friction force and sufficiently large with respect to the dynamic friction force when each sliding component slides is required. However, when the play-off method of this embodiment is used, no pressing is performed when each sliding part slides. Therefore, only the maximum static friction force is considered without considering the dynamic friction force, and the disk tray extrusion is performed. The pushing force of the mechanism 13 can be determined, and the design becomes easy.

  Further, as shown in FIG. 3, the permanent magnet 4 is embedded at a position where it is not exposed on the sliding surface of the guide rail 3. For this reason, since there is no change in the sliding surface compared to the conventional structure in which the permanent magnet 4 is not mounted, there is no increase in the coefficient of friction and the occurrence of surface irregularities, and the usability when the rack slide 1 slides. And durability will not deteriorate.

  Here, the rack slide 1 is pressed downward by the guide rail 3 and is loosely moved. However, the rack slide 1 may be configured to be pressed laterally or upward. The permanent magnet 4 may be arranged in place of the ferromagnetic body 2 provided in the rack slide 1 and the ferromagnetic body 2 may be arranged in place of the permanent magnet 4 provided in the guide rail 3. An effect is obtained.

  Furthermore, it is good also as a structure which uses a permanent magnet instead of the ferromagnetic body 2 with which the rack slide 1 or the guide rail 3 was equipped, and has a permanent magnet in both the rack slide 1 and the guide rail 3. FIG. In this case, when the disk tray 7 is loaded into the housing 16, the two permanent magnets are arranged to face each other. At this time, when the different poles are arranged to face each other, the attractive force works, and this embodiment The effect shown in is obtained. Moreover, you may arrange | position so that the same pole may oppose. In that case, a repulsive force acts between two permanent magnets, and the rack slide 1 is the direction opposite to the case where an attractive force acts, that is, the guide rail 3. Is pushed upwards and is rattled.

A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a lower perspective view showing the disc tray 7 and the transport mechanism 20. FIG. 4A shows the position of each component when the disc tray 7 is carried into the housing 16, and FIG. 4B shows the position of each component when the disc tray 7 is carried out of the housing 16. . FIG. 5 is a view showing a cross section of the disk tray 7 and the transport mechanism 20a on the surface Q and the surface R shown in FIG. 4, the cross section on the surface Q is FIG. 5 (a), and the cross section on the surface R is FIG. Shown in

  The transport mechanism 20b is also provided with a ferromagnetic body 2b, a permanent magnet 4b, a first ferromagnetic member 5b (described later), and a second ferromagnetic member 6b (described later) with the same configuration as in FIG. However, the ferromagnetic body 2, the permanent magnet 4, the first ferromagnetic member 5, and the second ferromagnetic member 6 may be attached to only one side. Moreover, it is good also as a structure which attaches the ferromagnetic body 2, the permanent magnet 4, the 1st ferromagnetic member 5, and the 2nd ferromagnetic member 6 with respect to the conveyance mechanism of one side.

  The optical disc device 100 according to the second embodiment also has a backlash structure similar to that of the first embodiment. The second embodiment is characterized in that, as shown in a cross section in FIG. 5, the first ferromagnetic member 5a (magnetic means) is provided so as to be in contact with the N pole of the permanent magnet 4a embedded in the guide rail 3a. As shown in a) and FIG. 5A, the disk tray 7 is provided with a second ferromagnetic member 6a (magnetic means), and a part of the surface of the disk tray 7 is placed inside the housing 16. When it is carried in, it is structured to face the ferromagnetic body 2a attached to the rack slide 1a. At this time, the ferromagnetic body 2a is sandwiched between the second ferromagnetic member 6a and the south pole of the permanent magnet 4a. One end of the second ferromagnetic member 6a protrudes below the disc tray 7, and a part of the surface of the second ferromagnetic member 6a is connected to the first ferromagnetic member 5a when the disc tray 7 is carried into the housing 16. The structure is in contact or close proximity.

  With this structure, when the disk tray 7 is carried into the housing 16, the first ferromagnetic member 5a and the second ferromagnetic member 6a serve as a magnetic circuit. At this time, when the first ferromagnetic member 5a and the second ferromagnetic member 6a are magnetized, the ferromagnetic body 2a is sandwiched between the N pole of the permanent magnet 4a and the S pole of the second ferromagnetic member 6a. It becomes. Therefore, the magnetic field lines emitted from the N pole of the permanent magnet 4a pass through the ferromagnetic body 2a and go to the S pole of the second ferromagnetic member 6a.

  As described above, the number of lines of magnetic force penetrating through the ferromagnetic body 2a is large and the magnetic flux leakage is small as compared with the case without the first ferromagnetic member 5a and the second ferromagnetic member 6a. A strong attractive force can be obtained even when a small and thin permanent magnet is used. Here, the rack slide 1 is adsorbed in the downward direction, but may be structured to be adsorbed in the horizontal direction or the upward direction.

  As shown in FIGS. 4B and 5B, when the disc tray 7 is carried out of the housing 16, the first ferromagnetic member 5a and the second ferromagnetic member 6a are used as the disc tray. 7 Since it moves in the direction of unloading and comes out of contact, the magnetic circuit is quickly disconnected. For this reason, the suction force is remarkably lowered while the disk tray 7 is being conveyed, and does not hinder the sliding of the guide rail 3a. Therefore, it is possible to obtain a backlash pressing force that is sufficiently effective in suppressing backlash vibration without concern about an increase in load resistance when the guide rail 3a slides. In addition, the permanent magnet 4a may be installed so that the N pole and the S pole are reversed. In this case, the effect is not changed only by reversing the direction of the lines of magnetic force.

  The permanent magnet 4 may be arranged in place of the ferromagnetic body 2 provided in the rack slide 1 and the ferromagnetic body 2 may be arranged in place of the permanent magnet 4 provided in the guide rail 3. An effect is obtained. Furthermore, instead of the ferromagnetic body 2 provided in the rack slide 1 or the guide rail 3, a permanent magnet may be used, and both the rack slide 1 and the guide rail 3 may be provided with permanent magnets. In this case, when the disk tray 7 is carried into the housing 16, the two permanent magnets are arranged to face each other, and if they are arranged so that the opposite poles face each other at that time, the attractive force works, and this implementation The effect shown in the example is obtained. Moreover, you may arrange | position so that the same pole may oppose, in that case, a repulsive force will work between two permanent magnets, and the rack slide 1 will be pushed in the opposite direction to the case where an attractive force is applied and will be loosely moved. Is done.

A third embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a top view of the optical disc apparatus 100 when the top cover 15 is removed. FIG. 7 is a schematic diagram showing the outer shape 21 of the optical disc 21 when the disc tray 7, the unit mechanism 8, and the optical disc are mounted. FIG. 7A is a top view, and FIG. 7B is a side view seen from the B direction in FIG. 7A.

  A straight line (broken line) L in FIG. 6 is a straight line that passes through the center of the spindle motor 10 and is perpendicular to the direction in which the disc tray 7 is carried out of the housing 16. 6 indicates a surface of the surface of the disc tray 7 that is a region directly facing the optical disc when the optical disc is mounted and is a region behind the center of the spindle motor 10. 6 and 7, the direction in which the disk tray 7 is carried out from the inside of the housing 16 to the outside is the front, and the opposite direction is the rear. In FIG. 7B, the direction parallel to the rotation axis of the spindle motor 10 toward the optical disc from the disc tray 7 when the optical disc is mounted on the disc tray 7 is the upper side, and the opposite direction is the lower side.

  In order to reduce fluid sound or prevent deterioration of noise performance, it is important to ensure a smooth air flow path inside the housing 16 when the optical disk rotates. If the gap between the optical disc and the disc tray 7 is too narrow, the air flow is not sufficiently secured and turbulent flow is generated, and noise generated by leaking the sound generated from the turbulent flow to the outside through the gap of the housing 16 increases. To do. This problem becomes apparent even when the disc tray 7 is deformed so as to rise to the optical disc side due to an excessive external force, or when the disc tray 7 is loosely moved toward the optical disc side. Since measures are taken to fill the gap between the bezel 12 and the casing 16 with rubber or the like in front of the casing 16, particularly problematic are gaps between the joints of the bottom cover 14 and the top cover 15, and external devices. Air leakage and sound leakage from the rear surface of the housing 16 in which there is a connector hole for connection to the housing. Therefore, when the gap between the surface indicated by the hatched portion A and the optical disk is reduced, the noise performance of the optical disk apparatus 100 is greatly deteriorated.

  In order to solve this problem, in this embodiment, the play-off mechanism shown in Embodiment 1 or Embodiment 2 is attached to the optical disc apparatus 100 shown in FIG. That is, on the surface of the disk tray 7, the rack slide 1 is attracted downward (indicated by an arrow in FIG. 7B) in the area directly facing the optical disk when the optical disk is mounted and in the area behind the center of the spindle motor 10. Example 1 and Example in which the above-mentioned area of the disk tray 7 which is repelled and supported by the rack slide 1 is rattled in a direction away from the optical disk (indicated by an arrow in FIG. 7B). A loosening mechanism shown in Fig. 2 was attached. With this structure, it is possible to prevent a gap between the surface indicated by the hatched portion A and the optical disk from becoming small, and to suppress an increase in noise leaking from the gap behind the housing 16.

  In the case where the unit mechanism 8 is installed behind the disc tray 7, the hatched portion A of the surface of the disc tray 7 that directly faces the optical disc when the optical disc is mounted is forward, so that the backlash mechanism is also provided. Mounted forward.

  DESCRIPTION OF SYMBOLS 1 ... Rack slide, 2 ... Ferromagnetic material (magnetic means), 3 ... Guide rail, 4 ... Permanent magnet (magnetic means), 5 ... 1st ferromagnetic member (magnetic means), 6 ... 2nd ferromagnetic member (Magnetic means), 7 ... disc tray, 8 ... unit mechanism, 9 ... pickup, 10 ... spindle motor, 11 ... switch, 12 ... bezel, 13 ... disc tray extrusion mechanism, 14 ... bottom cover, 15 ... top cover, 16 ... Case, 20 ... Conveying mechanism, 21 ... External shape of optical disc, 100 ... Optical disc device.

Claims (9)

A housing formed by a top cover and a bottom cover;
A spindle motor mounted with an optical disk and rotated, and a disk tray equipped with a pickup for reproducing information on the recording surface of the optical disk or recording new information on the recording surface;
In the optical disc apparatus provided with a transport mechanism for carrying the disc tray out of the housing or carrying it into the housing,
The transport mechanism includes a guide rail attached to the housing and a rack slide that supports the disc tray in a movable manner and moves while being guided by the guide rail, and the disc tray is carried into the housing. An optical disc apparatus characterized by comprising a magnetic means comprising a permanent magnet and a ferromagnetic material or a permanent magnet for pressing the rack slide against the guide rail. A part of the rack slide includes at least one permanent magnet, and a part of the guide rail includes a permanent magnet or a ferromagnetic body paired with the permanent magnet;
2. The optical disk apparatus according to claim 1, wherein the permanent magnet and the ferromagnetic material, or the permanent magnets are attached at positions facing each other when the disk tray is carried into the housing. A part of the rack slide is provided with at least one ferromagnetic material, and a part of the guide rail is provided with a permanent magnet paired with the ferromagnetic material;
The optical disk apparatus according to claim 1, wherein the ferromagnetic body and the permanent magnet are attached at positions facing each other when the disk tray is carried into the housing.   The permanent magnet and the ferromagnetic material, or the permanent magnets exhibit a magnetic force that attracts or repels the guide rail and the rack slide only when the disk tray is carried into the housing. Item 4. The optical disk device according to Item 1.   5. The optical disk according to claim 2, wherein the permanent magnet or the ferromagnetic material installed on the guide rail is embedded in the guide rail so as not to contact the rack slide. apparatus. A first ferromagnetic member attached to the guide rail in contact with one pole of the permanent magnet and an end on the opposite side of the rack slide with respect to the other pole of the permanent magnet A second ferromagnetic member attached to the disk tray as described above,
The magnetic circuit is formed by bringing the first ferromagnetic member and the second ferromagnetic member into contact with or in proximity to each other only when the disk tray is carried into the housing. Optical disk device.   The magnetic circuit is formed by the permanent magnet and the ferromagnetic material or the permanent magnets when the disk tray is carried into the housing, and the magnetic force attracted or repelled is increased. 5. The optical disk device according to 5.   The permanent magnet and the ferromagnetic material, or between the permanent magnets, are installed at a predetermined position that presses the rack slide in a direction in which the surface of the disc tray and the area facing the mounted optical disc are separated from the optical disc. The optical disk apparatus according to claim 1, wherein   Assuming that the direction in which the disk tray is carried out from the inside of the housing is the front, when viewed from the rotation axis direction of the spindle motor, the ferromagnetic material and the permanent magnet are installed behind the center of the spindle motor. 9. The optical disc apparatus according to claim 5, wherein

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