Chucking device and brushless motor and disc driving device in which the chucking device is installed
a disc driving device and disc driving technology, which is applied in the direction of data recording, magnetic recording, instruments, etc., can solve the problems of disc dislocation, recording and reproduction errors, and deterioration of the alignment accuracy of the recording disc, so as to prevent disc dislocation with respect to the cone part and lead smoothly
Inactive Publication Date: 2012-01-19
NIDEC CORP
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The solution effectively prevents disc displacement and vibration, ensuring accurate alignment and reliable recording and reproduction by reducing frictional forces and maintaining stable contact between the disc and the cone part, even at high rotational speeds.
Problems solved by technology
As a result, an aligning accuracy of the recording disc is deteriorated when the recording disc is rotated at such a high speed as 10,000 rotations per minute or in the case where a balancing performance of the recording disc is remarkably inferior.
Due to the disadvantage, the high-capacity DVD as the next-generation DVD possibly included the disadvantage that an error occurred in recording and reproduction.
In addition to the foregoing disadvantage, in the chucking device, in the case where the recording disc loses even a slight balance when rotated at such a high speed as 10,000 rotations per minute, the retaining parts and the inner peripheral edge of the central through hole of the recording disc strongly abut each other in one direction by a centrifugal force.
As a result, a recording / reproducing position changes in an initial stage of the rotation and during the rotation, which possibly caused an error in the recoding and reproduction.
The worst possible incident was that the recording disc was possibly disengaged from the chucking device.
Further, such a phenomenon that the recording disc and the retaining parts unfavorably bite into each other and move together is generated under the influence of the centrifugal force.
As a result, the drastic position shift of the recording disc makes it impossible for a reading function of the recording disc to follow the position shift of the recording disc, which may cause an error in the recording and reproduction.
Further, if the retaining force of the recording disc is weak, a vibration is generated between the recoding disc and the chucking device when the recording disc is rotated at a high speed.
The vibration makes the recording disc rotate while moving the disc by a minute distance, which also possibly caused an error in the recording and reproduction.
Method used
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Overall Structure of Brushless Motor
[0021]A brushless motor according to the present invention is described referring to FIG. 1. FIG. 1 is a schematic sectional view illustrating a preferred embodiment of the brushless motor according to the present invention.
[0022]First, a fixed member is described.
[0023]An annular step part 11 is provided on a lower surface of a sleeve retaining member 10 having a cylindrical shape provided with a bottom and an opening in an upper direction and formed by means of oil-impregnated sintering. An annular washer 20 is provided on an upper surface of the annular step part 11 so as to abut the surface, while a disc washer 21 is provided at the bottom part 12 of the annular step part 11 so as to abut the part.
[0024]A cylindrical sleeve 30 is fixedly provided so as to abut an inner peripheral surface of a cylindrical part 13 of the sleeve retaining section 10 and an upper surface of the annular washer 20. The sleeve 30 is made of an oil-impregnated sintere...
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Abstract
A cone part in a chucking device capable of freely attaching and detaching a disc having a disc shape includes an abutting portion for abutting an inner peripheral surface of a central through hole of the disc with substantially equal forces along an entire circumference thereof and aligning the disc. The cone part is made of a resin material having a high slidability than that of a material used for the disc.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation of U.S. application Ser. No. 11 / 491,965 filed Jul. 25, 2006, which is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2005-215437 filed Jul. 26, 2005 and Japanese Patent Application No. 2006-185842 filed Jul. 5, 2006, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a chucking device for making a disc having a disc shape freely attachable and detachable and a brushless motor and a disc driving device in which the chucking device is installed.[0004]2. Description of the Related Art[0005]In recent years, development of DVD having large capacity as a next-generation DVD (Digital Versatile Disc) for recording a high-quality image demanding a large capacity has been aggressively promoted. In the high-capacity DVD, the high capacity is realized in such a...
Claims
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IPC IPC(8): G11B17/03
CPCG11B17/0282G11B19/2009G11B17/0284
InventorITO, HARUHIKOTAKAKI, HITOSHISONODA, TOSHIHIDEYAMANE, TAKUYA
OwnerNIDEC CORP