Disk drive device having reduced thickness
First Claim
1. A disk drive device of the type comprising:
- a spindle rotatably supported by a chassis on which is to be mounted a disk;
a head disposed on said chassis so as to be movable in the radial direction of said disk;
a rotor yoke securely mounted on said spindle and securely carrying a disk-shaped driving magnet assembly;
a printed-circuit board disposed in opposing relationship with said driving magnet assembly and provided with a plurality of driving coils; and
a stator yoke mounted on said chassis in opposing relationship with said driving magnet assembly through said plurality of driving coils, wherein said chassis has an opening for housing therein said head;
said stator yoke has a recess in a portion corresponding to a region in which said head is displaced;
said printed circuit board has an opening in opposing relationship with said recess; and
at least one driving coil is disposed in said opening.
1 Assignment
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Accused Products
Abstract
A disk drive system in accordance with the present invention comprises a surface opposing type spindle motor which in turn comprises a spindle which is rotatably supported through a bearing by a chassis and to which is to be mounted a disk, a rotor yoke securely attached to the spindle, a driving magnet assembly, a printed-circuit board upon which are mounted a plurality of driving coils and a stator yoke disposed in opposing relationship with the driving magnet through the driving coils. A chassis has an opening in which is housed a head and the stator yoke is formed with a first recess in a region corresponding to a space in which the head is displaced. The bearing is a radial bearing having a diameter greater than that of the spindle. In order to avoid the interference between the driving coils and the first recess, the driving coils are disposed in an opening formed through the printed-circuit board or the space defined at the position corresponding to the recess. Furthermore, in order to balance the attractive forces of the driving magnet assembly or to cancel the cogging torque, the stator has a second recess at a position in opposing relationship with the first recess across the bearing.
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Citations
25 Claims
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1. A disk drive device of the type comprising:
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a spindle rotatably supported by a chassis on which is to be mounted a disk; a head disposed on said chassis so as to be movable in the radial direction of said disk; a rotor yoke securely mounted on said spindle and securely carrying a disk-shaped driving magnet assembly; a printed-circuit board disposed in opposing relationship with said driving magnet assembly and provided with a plurality of driving coils; and
a stator yoke mounted on said chassis in opposing relationship with said driving magnet assembly through said plurality of driving coils, wherein said chassis has an opening for housing therein said head;said stator yoke has a recess in a portion corresponding to a region in which said head is displaced; said printed circuit board has an opening in opposing relationship with said recess; and at least one driving coil is disposed in said opening. - View Dependent Claims (2, 3, 4)
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5. A disk drive device of the type having a spindle rotatably supported by a chassis on which is to be mounted a disk, a head disposed on said chassis so as to be movable in the radial direction of said disk, a rotary yoke securely mounted on said spindle and securely carrying a circular driving magnet assembly, a plurality of driving coils disposed in opposing relationship with said circular driving magnet assembly, and a stator yoke disposed on said chassis in opposing relationship with said circular driving magnet assembly through said plurality of driving coils;
- wherein the improvement comprises;
said chassis having an opening in which said head is housed; said stator yoke having a recess in a portion corresponding to a region in which said head is displaced; satisfying the condition P=4n+2, where P being the number of magnetized poles of said circular driving magnet assembly and 3n (n;
plus integers) being the number of said driving magnetic coils; andsaid plurality of driving coils being arranged in the form of a circle leaving a space corresponding to said recess of said stator yoke. - View Dependent Claims (6, 7)
- wherein the improvement comprises;
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8. A disk drive device of the type having a spindle which is rotatably supported through a bearing on a chassis and over which is mounted a disk;
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a head disposed on said chassis so as to be movable in the radial direction of said disk; a rotor yoke which is securely attached to said spindle and to which is attached a circular driving magnet ring; a plurality of driving coils disposed in opposing relationship with said circular driving magnet assembly; and
a stator yoke disposed on said chassis in opposing relationship with said circular driving magnet assembly through said plurality of driving coils;
wherein the improvement comprises;said chassis having an opening in which said head is housed; said stator yoke having a recess in a portion corresponding to a region in which said head is displaced; and
means, disposed at a position in opposing relationship with said recess across said bearing, for balancing attractive forces of said circular driving magnet assembly acting on said stator yoke. - View Dependent Claims (9, 10, 11)
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12. A disk drive device of the type having a spindle rotatably supported by a chassis on which is to be mounted a disk, a head disposed on said chassis so as to be movable in the radial direction of said disk, a rotary yoke securely mounted on said spindle and securely carrying a circular driving magnet assembly, a plurality of driving coils disposed in opposing relationship with said circular driving magnet assembly, and a stator yoke disposed on said chassis in opposing relationship with said circular driving magnet assembly through said plurality of driving coils;
- wherein the improvement comprises;
said chassis having an opening in which said head is housed; and said stator yoke having a first recess formed in a portion corresponding to a region in which said head is displaced and a second recess formed so as to cancel the cogging torque produced by said first recess. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
- wherein the improvement comprises;
Specification