JP4070746B2 - Recording medium driving device - Google Patents

Description

  The present invention relates to a recording medium driving apparatus for recording or reproducing data, or recording and reproducing data using a disk-shaped recording medium.

  In recent years, optical disk drive devices such as CD-ROM (Compact Disc-Read Only Memory) drive devices and DVD (Digital Versatile Disc) drive devices rotate a disk-shaped recording medium at high speed in order to increase the data reading speed. To do. Such a recording medium driving device for driving a recording medium such as an optical disk has a recording medium placed between a table fixed to a rotating shaft of a motor and a clamper loosely fitted in a fitting hole of a plate portion facing the table. The recording medium is rotated by rotating the motor.

  When the recording medium is rotated at a high speed by the rotation of the motor, the air near the surface of the recording medium flows in the rotation direction of the recording medium and is discharged outside the outer edge portion of the recording medium. As a result, a negative pressure is generated in the central portion of the recording medium, and the lift of the recording medium is generated by the action of the generated negative pressure and is attracted toward the plate portion, and a load is applied to the rotating shaft of the rotating motor. There was a problem.

Conventionally, in order to solve the above-mentioned problems, a recording medium drive that eliminates the negative pressure by providing holes, slits, or notches in the plate portion and taking in air from the holes, slits, or notches by the action of the generated negative pressure. An apparatus is disclosed (for example, refer to Patent Document 1).
JP 2003-196904 A

  The recording medium driving device disclosed in Patent Document 1 has holes, slits, or notches in the plate portion. When the recording medium is removed from the table, the plate portion is also a means for applying a force exceeding the holding force between the table and the clamper to the clamper and pulling the clamper away from the table. In order to avoid a reduction in strength, measures such as increasing the thickness of the plate portion are required, and there is a problem that the cost is further increased.

  In addition, the recording medium driving device disclosed in Patent Document 1 has holes, slits, or notches formed in the plate portion in portions overlapping the disk-shaped recording medium of the plate portion, and the holes, slits, or notches are provided. Depending on the velocity of the airflow passing through the recording medium, only the peripheral edge of the recording medium is lifted, which causes noise generation due to uneven rotation.

  The present invention has been made in view of such circumstances, and by providing a reflux hole in the plate portion, the negative pressure generated in the central portion of the disk-shaped recording medium is eliminated, and the airflow passing through the reflux hole is used. An object of the present invention is to provide a recording medium driving device that prevents non-uniform rotation.

  Another object of the present invention is to provide a recording medium driving device that can reduce the thickness of the entire device by reducing the thickness of the plate portion with the clamper cover fixed to the plate portion. To do.

In order to achieve the above object, a recording medium driving apparatus according to the present invention is loosely fitted in a fitting hole formed in a plate portion facing a table fixed to a rotating shaft of a motor, and a disk is interposed between the table and the table. And a clamper cover fixed to one surface of the plate portion so as to cover the clamper, wherein the plate portion is located outside the peripheral portion of the recording medium. equipped with a reflux hole for recirculating air is close to the fitting hole is formed portion has a shape located in said table side than the other portion, the clamper cover, so as to cover the clamper and the return hole Further, the peripheral portion has a planar shape fixed to the other portion of the plate portion .

In the present invention, the disk-shaped recording medium is rotated by the rotation of the motor, and the air near the surface of the recording medium flows in the rotating direction by the action of the rotation of the recording medium. Air flowing in the rotational direction of the recording medium may exit to the outside from the peripheral edge of the recording medium, the central portion of the recording medium becomes negative pressure. Due to the action of this negative pressure, air flowing out by rotation is circulated and taken in from the reflux hole provided on the plate part so as to be located outside the peripheral edge of the recording medium, and supplied to the central part of the recording medium. The negative pressure generated at the center of the recording medium is eliminated.

Further, in the present invention, the portion of the plate portion in which the fitting hole is formed is located on the table side with respect to the other portion and is recessed toward the table side, and the clamper cover that covers the clamper and the return hole is a plate. Since it is a planar shape fixed to the other part of the part, there is no part protruding on one side of the plate part, and the thickness of the plate part does not increase in the state where the clamper cover is fixed, It is easy to make the entire device thinner and more compact.

According to the recording medium driving apparatus according to the present invention, since it is provided partially non-overlapping with the disk-shaped recording medium of the plate portion, i.e., the reflux hole to the outer portion from the peripheral edge of the disc-shaped recording medium, stream can be returned from the reflux hole without causing lift biased periphery of the recording medium to the vicinity of the center of the disc-shaped recording medium generated by the rotation of the disc-shaped recording medium, the recording of the disc-shaped with the rotation The negative pressure generated at the center of the medium can be eliminated to reduce the load on the motor, and non-uniform rotation due to the airflow passing through the reflux hole can be prevented .

Further, according to the recording medium driving apparatus according to the present invention, the portion of the plate portion fitting hole is formed, Ri recessed der the table side, clamper cover secured to one side of the plate portion is in planar shape Oh from Rukoto, there is no one side protruding portion of the plate portion, the thickness of the plate portion without having to increase in a state of fixing a clamper cover, it is easy to thin and compact the entire apparatus .

(Embodiment 1)
Hereinafter, the present invention will be described in detail with reference to the drawings showing the first embodiment. FIG. 1 is an exploded perspective view of a recording medium driving apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of a main part of the recording medium driving apparatus according to Embodiment 1 of the present invention.

  In the figure, reference numeral 7 denotes a main body of the recording medium driving apparatus according to Embodiment 1 of the present invention, and the spindle motor 1 is disposed inside the main body 7. A disc-shaped turntable 2 is fixed to the end of the rotating shaft 10 of the spindle motor 1, and the turntable 2 rotates in conjunction with the rotation of the spindle motor 1.

  A fitting convex portion 20 having a short cylindrical shape is provided at the central portion of the turntable 2, and the outer diameter of the fitting convex portion 20 is the central portion of the recording medium 3 having a disc shape such as a CD-ROM or DVD. This corresponds to the inner diameter of the fitting hole 30 formed in a substantially circular shape. Further, a magnetic body 21 is embedded in the fitting convex portion 20.

  A disc-shaped clamper 4 is fixed to the turntable 2 so as to be substantially parallel to the turntable 2. A fitting concave portion 40 corresponding to the fitting convex portion 20 is formed in the center portion of the surface of the clamper 4 facing the turntable 2 side, and a hook-like locking portion 42 is formed on the outer peripheral surface of the clamper 4. 4 is provided on the other surface side. Further, a magnetized body 41 called a yoke is fixed to the other surface side of the clamper 4. The magnetized 41 is a substantially circular iron plate.

  Further, the turntable 2 is provided with a plate portion 5 constituting a part of the casing of the recording medium driving device according to the first embodiment. The plate portion 5 is configured such that a housing portion 50 that is recessed from the outer surface to the inner surface side is located at a position corresponding to the clamper 4, and the inner diameter of the housing portion 50 is larger than the outer diameter of the locking portion 42 of the clamper 4. It is comprised so that it may become.

  A fitting hole 51 that is larger than the diameter of the outer peripheral surface of the clamper 4 and smaller than the outer diameter of the locking portion 42 of the clamper 4 is formed on the bottom surface of the accommodating portion 50. It is loosely fitted. That is, when the clamper 4 holds the recording medium 3, an appropriate gap is formed between the outer peripheral surface of the clamper 4 and the peripheral edge portion of the fitting hole 51, and the bottom surface of the locking portion 42 of the clamper 4 and the storage portion 50. The clamper 4 and the plate portion 5 are not in contact with each other.

  As shown in FIG. 2, the accommodating portion 50 is covered with a clamper cover 6 bonded to the outer surface of the plate portion 5, and the clamper cover 6 prevents the clamper 4 from falling off from the fitting hole 51, The entry of dust, dust, etc. into the recording medium 3, spindle motor 1, etc. is prevented beforehand.

  The plate portion 5 is provided with a reflux hole 53 that allows air in the housing to circulate in a portion that does not overlap the recording medium 3. The shape of the reflux hole 53 is not particularly limited, and may be any shape such as a circle, an ellipse, a rectangle, or the like that allows air to circulate in the housing.

  With the above configuration, one surface of the recording medium 3 is brought into contact with the turntable 2 so that the fitting convex portion 20 of the turntable 2 is fitted in the fitting hole 30 of the recording medium 3, and the fitting convexity of the turntable 2 is When the clamper 4 is brought into contact with the recording medium 3 so as to fit the portion 20 and the fitting recess 40 of the clamper 4, the magnetized body 41 is magnetized by the magnetic force of the magnetic body 21, and the turntable 2 and the clamper 4. In the meantime, the recording medium 3 is held.

  The recording medium 3 held in this way rotates in conjunction with the rotation of the spindle motor 1. When the recording medium 3 rotates at high speed, air near the surface of the recording medium 3 flows in the rotation direction, the air at the center of the recording medium 3 is discharged outside the outer edge, and negative pressure is applied to the center of the recording medium 3. Will occur.

  Due to the negative pressure generated at the center of the recording medium 3, the air discharged by the rotation of the recording medium 3 is taken in again from the reflux hole 53 provided in the plate part 5. It passes between the hole 51 and the clamper 4 and is supplied to the center of the recording medium 3. Therefore, it is possible to eliminate the negative pressure generated in the central portion of the recording medium 3 without newly taking in air from the outside.

  In the recording medium driving apparatus according to the first embodiment, the reflux hole 53 is provided in the plate portion 5, but since the reflux hole 53 is not provided in a portion overlapping the recording medium 3, the recording medium 3 is circulated by air circulation. Therefore, the negative lift generated in the central portion of the recording medium 3 can be surely eliminated so that the spindle motor 1 is not burdened.

  As described above, according to the first embodiment of the present invention, the reflux hole is provided in the portion of the plate portion that does not overlap the disc-shaped recording medium, that is, the portion outside the outer edge portion of the disc-shaped recording medium. Therefore, the air flow generated by the rotation of the disk-shaped recording medium can be returned from the reflux hole to the vicinity of the center of the disk-shaped recording medium, and the negative pressure generated by the rotation can be eliminated to reduce the load on the motor. Is possible.

  In addition, since the part that forms the fitting hole is recessed to the table side, the thickness of the plate part does not increase with the clamper cover fixed, making it easy to make the entire device thinner and more compact. It becomes.

(Embodiment 2)
Hereinafter, the present invention will be described in detail with reference to the drawings showing the first embodiment. FIG. 3 is a cross-sectional view of the main part of the recording medium driving apparatus according to Embodiment 2 of the present invention. Since the exploded perspective view is the same as that of the first embodiment, the same reference numerals are given and detailed description thereof is omitted.

  The turntable 2 is provided with a plate portion 5 that constitutes a part of the casing of the recording medium driving device according to the second embodiment. In the plate part 5, a clamper cover support part 54 protruding from the inner surface to the outer surface side is formed at a position surrounding a reflux hole 53 provided for circulating the air inside the clamper 4 and the housing.

  A fitting hole 51 that is larger than the diameter of the outer peripheral surface of the clamper 4 and smaller than the outer diameter of the locking portion 42 of the clamper 4 is formed on the bottom surface of the plate portion 5. It is loosely fitted. That is, when the clamper 4 holds the recording medium 3, an appropriate gap is formed between the outer peripheral surface of the clamper 4 and the peripheral edge portion of the fitting hole 51, and the engaging portion 42 of the clamper 4 and the bottom surface of the plate portion 5. The clamper 4 and the plate portion 5 are not in contact with each other.

  The clamper 4 and the reflux hole 53 are covered with a clamper cover 6 bonded to the outer surface of the plate portion 5, and the clamper cover 6 prevents the clamper 4 from falling out of the fitting hole 51, and the recording medium 3, The entry of dust, dust, etc. into the spindle motor 1 etc. is prevented beforehand.

  With the above configuration, one surface of the recording medium 3 is brought into contact with the turntable 2 so that the fitting convex portion 20 of the turntable 2 is fitted in the fitting hole 30 of the recording medium 3, and the fitting convexity of the turntable 2 is When the clamper 4 is brought into contact with the recording medium 3 so as to fit the portion 20 and the fitting recess 40 of the clamper 4, the magnetized body 41 is magnetized by the magnetic force of the magnetic body 21, and the turntable 2 and the clamper 4. In the meantime, the recording medium 3 is held.

  The recording medium 3 held in this way rotates in conjunction with the rotation of the spindle motor 1. When the recording medium 3 rotates at high speed, air near the surface of the recording medium 3 flows in the rotation direction, the air at the center of the recording medium 3 is discharged outside the outer edge, and negative pressure is applied to the center of the recording medium 3. Will occur.

  Due to the negative pressure generated at the center of the recording medium 3, the air discharged by the rotation of the recording medium 3 is taken in again from the reflux hole 53 provided in the plate part 5. It passes between the hole 51 and the clamper 4 and is supplied to the center of the recording medium 3. Therefore, it is possible to eliminate the negative pressure generated in the central portion of the recording medium 3 without newly taking in air from the outside.

  In the recording medium driving apparatus according to the second embodiment, the reflux hole 53 is provided in the plate portion 5, but since the reflux hole 53 is not provided in a portion overlapping the recording medium 3, as in the first embodiment. The air circulation does not cause a biased lift at the peripheral portion of the recording medium 3, and the negative pressure generated at the central portion of the recording medium 3 is reliably eliminated so that the spindle motor 1 is not burdened. it can.

  Further, since there is no uneven shape on the surface of the plate portion 5 facing the recording medium 3, the air flow near the surface of the recording medium 3 generated by the rotation of the recording medium 3 is uniform, and the recording medium 3 The negative pressure generated when the air in the center is discharged outside the outer edge is also uniform. Therefore, it is possible to prevent uneven rotation due to the generation of a biased negative pressure, and to suppress the generation of noise.

  As described above, according to the second embodiment of the present invention, since the side of the plate facing the recording medium is flat, the air flowing out from the outer edge of the recording medium due to the rotation of the disk-shaped recording medium The flow becomes smooth, non-uniform rotation is less likely to occur, and noise is less likely to occur.

  In order to confirm the effects of the recording medium driving apparatus according to the first and second embodiments described above, the relationship between the rotation speed of the recording medium and the flying height of the recording medium is determined according to the conventional recording medium driving apparatus and the first embodiment. Each of the recording medium driving apparatus and the recording medium driving apparatus according to Embodiment 2 was measured. FIG. 4 is a diagram illustrating the relationship between the rotation speed of the recording medium and the flying height of the recording medium.

  In FIG. 4, a circle (◯) indicates a conventional recording medium driving device, a square (□) indicates a recording medium driving device according to the first embodiment, and a triangle (Δ) indicates a recording medium according to the second embodiment. The relationship between the rotational speed of the recording medium and the flying height of the recording medium is shown for each drive device. As is clear from FIG. 4, when the rotational speed of the recording medium exceeds 2800 rpm, the flying height of the recording medium driving apparatus according to the first embodiment is compared with the flying height of the conventional recording medium driving apparatus, and The flying height of the recording medium driving device according to the second embodiment is extremely small, and it can be confirmed that the floating of the recording medium due to negative pressure is effectively suppressed.

  Note that the recording medium driving device according to the present invention is not limited to the configuration shown in the first and second embodiments, and a part of the configuration is added or deleted without departing from the gist of the present invention. Or you may change.

  For example, the number of the reflux holes 53 is not limited to one, but can be provided anywhere on the plate portion 5 as long as it is a position that can be covered by the clamper cover 6 and does not overlap the recording medium 3. May be.

1 is an exploded perspective view of a recording medium driving device according to Embodiment 1 of the present invention. 1 is a cross-sectional view of a main part of a recording medium driving device according to Embodiment 1 of the present invention. It is principal part sectional drawing of the recording-medium drive device which concerns on Embodiment 2 of this invention. It is a figure which shows the relationship between the rotation speed of a recording medium, and the flying height of a recording medium.

Explanation of symbols

1 Spindle motor (motor)
2 Turntable (table)
DESCRIPTION OF SYMBOLS 3 Recording medium 4 Clamper 5 Plate part 6 Clamper cover 10 Rotating shaft 51 Fitting hole 52 Convex part 53 Recirculation | reflux hole 54 Clamper cover support part

Claims (1)

A clamper loosely fitted in a fitting hole formed in a plate portion facing the table fixed to the rotating shaft of the motor, and holding a disk-shaped recording medium between the table and the clamper so as to cover the clamper; In a recording medium driving device comprising a clamper cover fixed to one surface of a plate part,
The plate portion has a reflux hole for refluxing air located outside the peripheral edge of the recording medium, and the portion where the fitting hole is formed is located on the table side from the other portion, The clamper cover has a planar shape in which a peripheral portion is fixed to another portion of the plate portion so as to cover the clamper and the return hole.

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