JP4211803B2 - Optical disk device - Google Patents

Description

  The present invention relates to an optical disc apparatus that performs recording / reproduction on an optical disc such as a CD or a DVD, and more particularly, to an optical disc apparatus having an improved chuck portion of an optical disc.

  As shown in FIG. 6, an example of the chuck portion of an optical disk in a conventional optical disk apparatus is a synthetic resin clamper 3 having a magnet 3a attached to the upper surface and a metal plate 4b attached to the upper surface of the central circular convex portion 4a. A turntable 4 made of synthetic resin is provided, and the turntable 4 is fixed to a shaft 5a of a spindle motor 5 and rotates. The lower surface of the clamper 3 is formed with a concave portion 3b into which the upper end portion of the circular convex portion 4a of the turntable 4 is fitted, and a yoke 3c is attached on the upper surface of the magnet 3a.

  The above-described clamper 3 is held by the holder portion 1a so that it does not fall off by locking its upper end flange portion 3d to the inner flange 1b of the lower end of the holder portion 1a provided in the main chassis 1 of the optical disc apparatus. The turntable 4 and the spindle motor 5 are mounted on a traverse chassis 2 attached to the main chassis 1 so as to be swingable up and down. The traverse chassis 2 is in a lowered state as shown in the figure when a tray (not shown) for transporting the optical disk is pulled out, so that there is a gap for transporting the optical disk between the clamper 3 and the turntable 4. ing.

  Then, when the optical disk is placed on the tray from this state and conveyed to the gap between the clamper 3 and the turntable 4, the traverse chassis 2 rises and the circular convex portion 4a of the turntable 4 is fitted into the central opening of the optical disk, and the circular shape is increased. The clamper 3 is attracted to the turntable 4 by the magnetic force of the magnet 3a acting on the metal plate 4b on the upper surface of the convex portion 4a so that the peripheral edge of the central opening of the optical disk is sandwiched between the clamper 3 and the turntable 4 from above and below. It has become.

  On the other hand, a permanent magnet is embedded in the upper surface of the thick part at the center of the turntable, and a yoke is attached to the upper surface of the disk pressing member so that the corner chamfers that prevent interference between the turntable and the disk pressing member are not in contact with each other. Formed on the thick part of the turntable and the corner part of the disk holding member, and the disk holding member is an elastic contact member that elastically contacts the upper surface of the thick part of the turntable when the disk holding member is drawn to the turntable. A provided recording medium holding structure is known (Patent Document 1).

Also known is a disk chucking mechanism that attaches the centering protrusion to the turntable by biasing upward with a biasing spring, and causes the centering protrusion to elastically contact the chucking pulley when there is no disk. (Patent Document 2).
JP 2005-56483 A Japanese Patent Laid-Open No. 2005-4803

  However, in the optical disk chuck portion of the optical disk apparatus shown in FIG. 6, when the tray is stored without placing the optical disk, the turntable 4 and the spindle motor rise together with the traverse chassis 2 as shown in FIG. Then, the clamper 3 is attracted to the turntable 4 by the magnetic force of the magnet 3a and performs a chucking operation. At this time, the lower surface of the concave portion 3b of the clamper 3 hits the metal plate 4 of the circular convex portion 4a of the turntable 4, There is a problem in that a high metallic impact sound that is directly transmitted to the magnet 3a and the yoke 3c and may be uncomfortable is generated.

  On the other hand, the recording medium holding structure of Patent Document 1 reduces the impact sound because the upper surface of the thick portion at the center of the turntable contacts the elastic contact member when the disk pressing member is pulled toward the turntable. Is possible. However, since the disk pressing member is provided with a plurality of arm-like base portions protruding inward from the central annular wall of the disk pressing member and the bent portion at the tip thereof as the elastic contact member, the shape of the disk pressing member is It becomes complicated, and if such a complicated disk pressing member is integrally molded with resin, a new mold is required or a large change of the mold is required, so that the manufacturing cost is considerably increased. There is a problem. However, even if the elastic contact member is manufactured separately and incorporated in the disc pressing member, the production cost of the elastic contact member is high, and the assembly work is cumbersome and time-consuming. There is a problem of a significant increase.

  Also, the disc chucking mechanism of Patent Document 2 has a problem in that the structure is complicated and the manufacturing cost increases because the center ring protrusion is attached to the turntable by urging upward with an urging spring. Moreover, it is difficult to employ such impact mitigation means for chucking the optical disk by pulling the clamper to the turntable by the magnetic force of the magnet.

  The present invention has been made under the circumstances described above, and the impact sound when the clamper is attracted to the turntable and chucked in the absence of the optical disc is incorporated without adding an impact mitigating member or the like. An object of the present invention is to provide an optical disk apparatus that can be reliably reduced by slightly changing the structure.

In order to solve the above problems, an optical disc apparatus of the present invention includes a synthetic resin clamper having a magnet attached to the upper surface, and a synthetic resin turntable having a metal plate attached to the upper surface of a central circular convex portion, The circular convex part of the turntable is fitted in the central opening of the optical disk conveyed between the clamper and the turntable, and the clamper is pulled to the turntable by the magnetic force of the magnet acting on the metal plate. In the optical disk device in which the peripheral edge of the central opening is sandwiched from above and below, when the clamper is attracted to the turntable by the magnetic force of the magnet in the absence of the optical disk , the impact is applied to the taper part on the outer periphery of the circular convex part The taper angle at which the lower end is in line contact as the relaxing contact portion is the circular convex portion. The smaller the taper portion than the taper angle of the tapered portion, and is characterized in that formed on the inner surface of the recess of the circle the clamper upper portion of the circular protrusion is fitted.

According to the optical disk apparatus of the present invention, when the clamper is attracted to the turntable by the magnetic force of the magnet and does the chucking operation in the absence of the optical disk, the taper portion formed as the impact reducing contact portion on the inner surface of the concave portion of the clamper . In order to disperse and alleviate the impact at the time of chuck operation by making a line contact at an angle corresponding to the taper angle from the lower end of the taper portion on the outer periphery of the upper end other than the circular convex metal plate of the turntable, Impact noise can be reduced. In particular, when the lower end portion of the tapered portion formed in the concave portion of the clamper is in line contact with the tapered portion of the circular convex portion of the turntable obliquely as in this optical disc apparatus, an excellent impact mitigating action is exhibited, Sound reduction effect becomes remarkable. In addition, the taper portion formed in the concave portion of the clamper as the impact relaxation contact portion is a synthetic resin taper portion , and the contact with this is also the taper portion of the synthetic resin circular convex portion other than the metal plate of the turntable. The sound quality of the impact sound is mild and low, and the risk of feeling uncomfortable like the conventional high metal impact sound can be eliminated. In addition, since the taper portion with a small taper angle where the lower end is in line contact with the inner surface of the concave portion of the clamper can be formed on the inner surface of the concave portion of the clamper with a slight change in the molding die of the clamper, there is almost no increase in manufacturing cost Economically advantageous.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a perspective view of an optical disk apparatus according to an embodiment of the present invention, FIGS. 2 to 4 are cross-sectional views of an optical disk chuck portion of the optical disk apparatus, FIG. 2 is a non-chucked state, and FIG. FIG. 4 shows the chucked state when the optical disk is transported, and FIG. 4 shows the chucked state when there is no optical disk. FIG. 5 is an enlarged partial sectional view in which a part of FIG. 4 is enlarged.

  As shown in FIG. 1, this optical disk apparatus has a synthetic resin traverse chassis 2 attached to the inside of a synthetic resin main chassis 1 so as to be swingable up and down at the rear end thereof. A cam slider 6 that swings 2 up and down is attached to the inside of the front frame portion of the main chassis 1.

  A bridge portion 1d is integrally formed between the upper ends of the left and right side frame portions 1c, 1c of the main chassis 1, and an annular holder portion 1a is formed at the center of the bridge portion 1d. As shown in FIGS. 1 and 2, a synthetic resin clamper 3 is housed and held inside the holder portion 1a with its upper end flange portion 3d engaged with the inner flange 1b at the lower end of the holder portion. Has been.

  As shown in FIGS. 1 and 2, a spindle motor 5 is mounted on the front end of the traverse chassis 2, and a synthetic resin turntable 4 is fixed to a shaft 5 a of the spindle motor 5. In addition, an optical pickup 7 is mounted on the traverse chassis 2 so as to be close to and away from the turntable 4 along two guide shafts 8 and 8 (main shaft and sub shaft).

  Inside the main chassis 1, a tray 9 on which an optical disk is placed is disposed between the turntable 4 and the clamper 3, and is slidably attached in the front-rear direction, and further includes a cam slider 6 and an optical pickup 7. A drive motor (not shown) for operating the tray 9 and a driving force transmission gear mechanism (not shown) are provided in the main chassis 1 and the traverse chassis 2.

  The turntable 4 of this optical disk apparatus is a disc-shaped table made of synthetic resin similar to the turntable 4 of the conventional optical disk apparatus. As shown in FIG. 4a is formed, and an annular support portion 4f for supporting the peripheral edge portion of the central opening of the optical disk is formed on the outer peripheral portion. A concave hole 4c into which the motor shaft insertion cylinder 3k at the center of the lower surface of the clamper 3 is fitted is formed at the center of the upper surface of the circular convex portion 4a, and the upper surface around the concave hole 4c. A donut plate-like metal plate 4b is attached to the plate. Further, a tapered portion 4d having a large taper angle (inclination angle) is formed on the outer periphery of the upper end of the circular convex portion 4a, and a tapered portion 4e having a small taper angle is continuously formed below the tapered portion 4d. Has been. These tapered portions 4d and 4e are formed in order to make it easier to fit the circular convex portion 4a into the central opening of the optical disc. The turntable 4 is integrally attached to the spindle motor 5 and rotated by passing the spindle motor shaft 5a through the central motor shaft through hole 4g and fixing it.

  The clamper 3 of this optical disc apparatus is configured in the same manner as the clamper 3 of the conventional optical disc apparatus described above except that the tapered portion 3e formed on the inner surface of the recess 3b is different. That is, in the center of the clamper 3, there is formed a recess 3b (a recess recessed upward) into which the upper end of the circular protrusion 4a of the turntable 4 is fitted during chucking operation. The motor shaft insertion cylinder 3k into which the shaft 5a of the spindle motor 5 is inserted during the chucking operation protrudes downward. A shaft tube portion 3f protrudes upward from the center of the upper surface of the recess 3b, and a donut-shaped magnet 3a and a yoke 3c are stacked around the shaft tube portion 3f on the upper surface of the recess 3b. Installed. An annular pressing portion 3j that presses the peripheral edge of the central opening of the optical disk is formed on the outer peripheral portion of the lower surface of the clamper 3. The clamper 3 is held by the holder portion 1a so as not to drop off by engaging the upper end flange portion 3d of the annular peripheral wall portion 3g with the lower end inner flange 1b of the holder portion 1a.

  As shown in FIGS. 4 and 5, the tapered portion 3e formed on the inner surface of the concave portion 3b of the clamper 3 is formed by the magnetic force of the magnet 3a acting on the metal plate 4b of the turntable 4 in the absence of the optical disk. Is attracted to the turntable 4 and performs a chucking operation so that the lower end 3h (lower end edge) of the tapered portion 3e is in line contact with the tapered portion 4d of the circular protrusion 4a of the turntable 4 as an impact reducing contact portion. The taper angle (tilt angle) is smaller than that of the prior art. That is, as shown in FIG. 7, the taper angle of the taper portion 3i formed on the inner surface of the concave portion 3b of the conventional clamper 3 is substantially the same as the taper angle of the taper portion 4d of the circular convex portion 4a of the turntable 4. Therefore, when the chucking operation is performed in the absence of the optical disk, even if the upper surface of the circular convex portion 4a contacts the lower surface of the concave portion 3b, both the tapered portions 3i and 4d do not contact each other with a small gap. However, as shown in FIGS. 4 and 5, the clamper 3 of the optical disk apparatus of the present invention has a taper angle of the taper portion 3e on the inner surface of the concave portion 3b, and the taper portion 4d of the circular convex portion 4a of the turntable 4. Since the taper angle is smaller than the taper angle, the lower end portion 3h (lower end edge portion) of the taper portion 3e makes line contact with the taper portion 4d of the circular convex portion 4a of the turntable 4.

  As described above, when the lower end portion 3h of the tapered portion 3e of the clamper 3 is in line contact with the tapered portion 4d of the turntable 4 when the chucking operation is performed in the absence of the optical disk, as described above, excellent impact during the chucking operation is achieved. Since the dispersion relaxation effect is exhibited, a significant impact noise reduction effect can be exhibited. In addition, since the lower end 3h of the tapered portion 3e of the clamper 3 and the tapered portion 4d of the turntable 4 which are in contact with each other are portions made of synthetic resin, the sound quality of the impact sound is mildly lowered and the conventional high metallic impact is reduced. The fear of feeling uncomfortable like sound can be eliminated. Further, the tapered portion 3e on the inner surface of the concave portion 3b of the clamper 3 can be molded by slightly deeply cutting the mold surface for molding the inner surface of the concave portion of a conventional clamper molding die. Therefore, a substantial increase in manufacturing cost can be suppressed.

  In the optical disk measure having the above-described configuration, when the tray 9 is pulled out as shown in FIG. 1, the traverse chassis 2 is lowered as shown in FIG. 2, and the clamper 3 and the turntable 4 are separated from each other so as not to chuck. Is in a state. From this state, when the optical disk is placed on the tray 9 and conveyed between the clamper 3 and the turntable 4, the traverse chassis 2 rises and the circular convex portion 4a of the turntable 4 becomes the center of the optical disk 10 as shown in FIG. The optical disk 10 is centered by being fitted into the opening 10a from below. The clamper 3 is attracted to the turntable 4 by the magnetic force of the magnet 3 a acting on the metal plate 4 b of the turntable 4, and the peripheral edge portion 10 b of the central opening 10 a of the optical disk 10 is connected to the annular pressing portion 3 j of the clamper 3 and the turntable 4. Is sandwiched from above and below by the annular support portion 4f. When the optical disk 10 is thus chucked, the upper end portion of the circular convex portion 4a of the turntable 4 is fitted into the concave portion 3b of the clamper 3 and the shaft 5a of the spindle motor 5 is connected to the clamper 3 as shown in FIG. The upper end flange portion 3d of the clamper 3 is slightly lifted from the lower end inner flange 1b of the holder portion 1a.

  When the optical disk 10 is chucked as described above, the spindle motor 5 operates to rotate the turntable 4, the optical disk 10, and the clamper 3, and the optical pickup 7 moves toward the turntable 4 along the guide shafts 8 and 8. While moving, the optical disk 10 is irradiated with a laser beam to perform recording / reproduction.

  When the recording / reproduction is finished, the traverse chassis 2 is lowered, the clamper 3 and the turntable 4 are separated, and the optical disk 10 is pulled out together with the tray 9. When the empty tray 9 from which the optical disk 10 has been taken out is stored, as shown in FIGS. 4 and 5, the traverse chassis 2 is raised and the chucking operation is performed in the absence of the optical disk. As described above, the lower end 3h of the tapered portion 3e of the inner surface of the concave portion 3b of the clamper 3 contacts the tapered portion 4d of the circular convex portion 4a of the turntable 4 so that the impact is dispersed and alleviated, so that the impact sound is reduced and the sound quality is also improved. Mild and low. Therefore, there is no discomfort due to the impact sound.

  The optical disk apparatus of the present invention has been described with reference to the representative embodiment. However, the present invention is not limited to this embodiment. For example, as an impact relaxation contact portion, other than the metal plate 4b of the turntable 4 Various design changes can be allowed, such as providing the clamper 3 with protrusions that contact the resin portion.

1 is a perspective view of an optical disc apparatus according to an embodiment of the present invention. It is sectional drawing of the optical disk chuck | zipper part of the same optical disk apparatus, Comprising: A non-chuck state is shown. It is sectional drawing of the optical disk chuck | zipper part of the same optical disk apparatus, Comprising: The chuck | zipper state when an optical disk is conveyed is shown. It is sectional drawing of the optical disk chuck | zipper part of the same optical disk apparatus, Comprising: The chuck | zipper state when there is no optical disk is shown. FIG. 5 is an enlarged partial cross-sectional view in which a part of FIG. 4 is enlarged. It is sectional drawing of the optical disk chuck | zipper part of the conventional optical disk apparatus, Comprising: A non-chuck state is shown. It is sectional drawing of the optical disk chuck | zipper part of the conventional optical disk apparatus, Comprising: The chuck | zipper state when there is no optical disk is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main chassis 2 Traverse chassis 3 Clamper 3a Magnet 3b Clamper's recessed part 3c Yoke 3d Clamper's upper end flange part 3e Taper part of the clamper's recessed part inner surface 3h Lower end part of the tapered part of the clamper's recessed part's inner surface 4 Turntable 4a Circular convex 4b Metal plate 4d Tapered portion of the upper end of the circular convex portion of the turntable 5 Spindle motor 5a Spindle motor shaft 6 Cam slider 7 Optical pickup 9 Tray 10 Optical disc 10a Central opening of optical disc 10b Peripheral portion of central opening of optical disc

Claims (1)

A synthetic resin clamper with a magnet attached to the upper surface and a synthetic resin turntable with a metal plate attached to the upper surface of the central circular projection, and the central opening of the optical disk conveyed between the clamper and the turntable In addition, the circular convex part of the turntable is fitted to the clamp, and the clamper is pulled to the turntable by the magnetic force of the magnet acting on the metal plate, so that the peripheral part of the central opening of the optical disk is sandwiched from above and below by the clamper and the turntable. In an optical disk device,
When the clamper is attracted to the turntable by the magnetic force of the magnet in the absence of the optical disk, a taper angle at which the lower end line-contacts as a shock relaxation contact part on the taper part of the upper end outer periphery of the circular convex part has a taper angle. An optical disc apparatus characterized in that a taper portion smaller than the taper angle of the taper portion of the circular convex portion is formed on the inner surface of the concave portion of the clamper into which the upper end portion of the circular convex portion is fitted.

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