Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
Reexamination Certificate
1998-02-02
2001-07-03
Ometz, David L. (Department: 2652)
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specific detail of storage medium support or motion production
Reexamination Certificate
active
06256288
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a disk apparatus, and in particular, to a disk apparatus that rotates a disk-like recording medium at a high speed to record and reproduce information on and from the medium, for example, an optical disk apparatus such as a CO-ROM, a DVD-ROM, or a DVD-RAM, as well as a disk apparatus motor.
Conventional disk apparatuses have a supporting protrusion provided on the lowest plate in a stator core and extending toward a bracket body, with the tip of the supporting protrusion fixed to the bracket body using an adhesive, as described in Japanese Patent Unexamined Publication No. 4-133640. Related apparatuses are described in Japanese Utility Model Unexamined Publication No. 5-78157, Japanese Patent Unexamined Publication No. 4-507184 (WO90/13167), and Japanese Patent Unexamined Publication No. 5-30719.
In these conventional disk apparatuses, the rigidity is increased by the supporting protrusion of the stator core and the natural frequencies are thus increased, but no considerations have been given to dampen the vibration, to prevent the motor falling toward the head and to reduce current consumption. Recently, these considerations have been particularly important due to the increased speed of disk apparatuses and the demand for miniaturization and multiple functions.
It is an object of the present invention to provide a disk apparatus and a motor therefor which reduce errors during recording or reproduction by damping vibration and preventing the motor from falling toward the head and which lower power consumption.
SUMMARY OF THE INVENTION
The object can be achieved by providing a disk apparatus comprising a motor for rotating a disk and a head for recording and reproducing data on and from said disk wherein said motor is mounted on said disk apparatus through a damping member.
The object can be achieved by providing a disk apparatus comprising a motor for rotating a disk and a head for recording and reproducing data on and from the disk wherein the motor comprises a rotating portion and a fixed portion, the rotating portion of the motor comprising a rotor, a shaft, and means for holding the disk, the fixed portion of the motor comprising a bearing section in which a bearing is provided in a bearing housing and a stator section in which a stator core having a stator coil is mounted in the bearing housing, the shaft being inserted into and supported by the bearing, the stator section being mounted in the disk apparatus via a damping member.
The above object can be achieved by providing a disk apparatus comprising a motor and a head wherein the motor comprises a rotating portion and a fixed portion, the rotating portion of the motor having means for holding the disk, the fixed portion of the motor having a bearing section and a stator section mounted in the disk apparatus via damping members provided on or near a straight line joining a rotating center of the motor with an objective lens in the head that is used to record and reproduce data on and from the disk.
The above object can be achieved by providing a disk apparatus comprising a motor and a head wherein the motor comprises a rotating portion and a fixed portion, the rotating portion of the motor having means for holding the disk, the fixed portion of the motor having a bearing section and a stator section mounted in the disk apparatus via vibration damping members provided in such a way that one side of these members which is closer to a line joining the motor with the objective lens in the head has a higher rigidity than the other side.
The above object can be achieved by providing a disk apparatus comprising a motor for rotating a disk and a head for recording and reproducing data on and from the disk wherein the motor comprises a rotating portion and a fixed portion, the rotating portion of the motor comprising a rotor, a shaft and means for holding the disk, the fixed portion of the motor comprising a bearing section in which a bearing is provided in a bearing housing and a stator section in which a stator core having a stator coil is mounted in the bearing housing, the shaft being inserted into and supported by the bearing, and wherein legs of a plurality of damping members are interposed between the stator section and the apparatus body so as to be located on a circle centered at a rotating center of the motor, the damping members being provided in proximity to a line joining the rotating center of the motor with an objective lens in the head that is used to record and reproduce data on and from the disk in such a way that the members are symmetrical relative to this line.
The above object can be achieved by providing a disk apparatus comprising a motor for rotating a polycarbonate disk of about 120 mm diameter and a head for recording and reproducing data on and from the disk wherein the motor comprises a rotating portion and a fixed portion, the rotating portion of the motor comprising a rotor, a shaft and means for holding the disk, the fixed portion of the motor comprising a bearing section in which a sliding bearing is provided in a bearing housing and a stator section in which a stator core having a stator coil is mounted in the bearing housing, the shaft being inserted into and supported by the sliding bearing and having an shaft diameter of 1 mm or more and 2.5 mm or less, a gap between the shaft and the sliding bearing being 2 &mgr;m or more and 8 &mgr;m or less.
The above object can be achieved by providing a disk apparatus comprising a spindle motor for rotating a disk and a head for recording and reproducing data on and from the disk wherein the motor comprises a rotating portion and a fixed portion, the rotating portion of the motor comprising a rotor including a multipolar permanent magnet, a shaft and a turn table for holding the disk, the fixed portion of the motor comprising a cylindrical bearing housing, a sliding bearing installed in the bearing housing in such a way that the bearing is divided into two parts positioned up and down, a stator core mounted on an outer circumference of the bearing housing and a stator coil provided in the stator core, a lower end of the bearing housing being mounted on a substrate, the shaft being inserted into and supported by the sliding bearing, a lubricant being interposed between the shaft and sliding bearing in the bearing housing, and wherein a plurality of damping members are interposed between the stator section and the apparatus body so that legs of the damping members are located on a circle centered at a rotating center of the motor, the damping members being provided symmetrically and in proximity to a line joining the rotating center of the motor with an objective lens for recording and reproducing data on and from the disk.
The above object can be achieved by providing a motor for a disk apparatus having a rotating portion and a fixed portion, the rotating portion having means for holding a disk, the fixed portion having a bearing section and a stator section mounted on a substrate via damping members, the damping members being provided in such a way that one side of these members which is closer to a line perpendicular to a rotating shaft of the rotating portion has a higher rigidity than the other side.
The above object can be achieved by providing a motor for a disk apparatus comprising a spindle motor having a rotating portion and a fixed portion, the rotating portion comprising a rotor including a multi-polar permanent magnet, a shaft and a disk, the fixed portion comprising a cylindrical bearing housing, a sliding bearing installed in the bearing housing in such a way that the bearing is divided into two parts positioned up and down, a stator core mounted on an outer circumference of the bearing housing and a stator coil provided in the stator core, a lower end of the bearing housing being mounted on a substrate, the shaft being inserted into and supported by the sliding bearing, a lubricant being interposed between the shaft and sliding bearing in the bearing housing, and wherein a plural
Kouno Takashi
Kumasaka Noriyuki
Nagai Kyuichiro
Nii Katsutoshi
Nishida Ikuo
Antonelli Terry Stout & Kraus LLP
Castro Angel
Hitachi , Ltd.
Ometz David L.
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