GB2307769A - Data storage device - Google Patents

Data storage device Download PDF

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Publication number
GB2307769A
GB2307769A GB9621464A GB9621464A GB2307769A GB 2307769 A GB2307769 A GB 2307769A GB 9621464 A GB9621464 A GB 9621464A GB 9621464 A GB9621464 A GB 9621464A GB 2307769 A GB2307769 A GB 2307769A
Authority
GB
United Kingdom
Prior art keywords
data storage
actuator
storage medium
circuit board
printed circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9621464A
Other versions
GB2307769B (en
GB9621464D0 (en
Inventor
Young-Sub Ahn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1019950045690A external-priority patent/KR0153883B1/en
Priority claimed from KR1019950046429A external-priority patent/KR0183153B1/en
Priority claimed from KR1019950046425A external-priority patent/KR0183154B1/en
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of GB9621464D0 publication Critical patent/GB9621464D0/en
Publication of GB2307769A publication Critical patent/GB2307769A/en
Application granted granted Critical
Publication of GB2307769B publication Critical patent/GB2307769B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
    • H02K11/014—Shields associated with stationary parts, e.g. stator cores
    • H02K11/0141—Shields associated with casings, enclosures or brackets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/035—DC motors; Unipolar motors
    • H02K41/0352—Unipolar motors
    • H02K41/0354—Lorentz force motors, e.g. voice coil motors
    • H02K41/0358—Lorentz force motors, e.g. voice coil motors moving along a curvilinear path
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/26—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors consisting of printed conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Moving Of Heads (AREA)

Abstract

A hard disk drive 10 includes a disk 15 for storing data, a read/write head 18 for recording data on or reproducing data from the disk 15, an actuator 17 for moving the read write head across the disk 15, a printed circuit board, motors for rotating the disk 15 and pivoting the actuator 17, a magnetic field shielding material 19, and a cover 20. The disk 15 is mounted on a spin shaft 12 formed on the PCB 11. The read/write head 18 is attached to one end of the actuator 17, the other end of which is pivotally mounted on a shaft 13 formed on the PCB 11. The printed circuit board 11, which forms the base of the hard disk, is a multi-layer type PCB. The motor for rotating the disk 15 comprises a permanent magnet 15a attached to the disk 15 and multi-layer pattern coil 14a formed on the PCB 11 around the shaft 12. Similarly, the actuator motor comprises a permanent magnet 17a fixed to the actuator 17 and a multi-layer pattern coil 14b printed on the PCB 11 around the shaft 13. This makes for a slimmer device.

Description

DATA STORAGE DEVICE Field of the Invention This invention relates to data storage devices, such as hard disk drives, and in particular to such devices which are suitable for use in portable computers.
Background to the Invention Portable computers, such as notebook computers or lap-top computers, commonly employ hard disk drives like that shown in FIG. 1. The hard disk drive 30 forms the main memory device of these computers. It includes a spindle motor 32 installed at one end of a base 31 and a disk 34 fixed to the spindle motor 32. The spindle motor 32 includes an internal coil 32a and a permanent magnet 32b. A disk 34, which is the data storage medium of disk drive 30, is attached to the hub of spindle motor 32 by means of a clamp and several screws.
A magnetic head 35 records information on or reproduces information from the disk 34. The magnetic head 35 is fixed to an actuator 38 which is pivotally mounted on a shaft 36; the shaft 36 is formed on the base 31. This pivotal mounting allows the actuator 38 to move the magnetic head 35 across the disk 34. Movement of the magnetic head 35 is a result of the rotation of the actuator 38 on a bearing 37. The rotational force, in turn, is supplied by a voice coil motor, consisting of bobbin and coil 38a, permanent magnet 32b, and upper and lower yokes 39a and 39b.
All of the above components are supported by the base 31 and shielded from external conditions by a cover 40. A printed circuit board 41, which carries the electrical components of disk drive 30, controls the overall operation of the system and its components.
When the disk drive 30 is turned on, current flows through the coil 32a. This current flow induces a magnetic field.
The interaction of the coil-induced magnetic field with the magnetic field generated by the permanent magnet 32b produces a rotational force. This rotational force causes the rotation of spindle motor 32, which, in turn, causes the rotation of the disk 34. Similarly, the current flow through the coil 38a, and the subsequent interaction between the coil-induced and permanent magnetic fields, causes rotation of actuator 38. The pivotal motion of actuator 38 about its shaft 36 causes movement of the magnetic head 35 across the disk 34. Air flow on the surface of disk 34, generated by its high speed rotation, means that a small gap is maintained between the disk 34 and magnetic head 35 as it moves across the disk surface.
During movement of the magnetic head 35 across the disk 34, either data recording or data reproduction takes place.
In the conventional hard disk drive, the actuator drive, as shown in FIG. 2A, produces rotational force by the interactive magnetic field effect between the voice coil 38a through which current flows under the control of the controller and the permanent magnet 38b which is fixed on the lower yoke 39b and generates a magnetic field.
The structural complexity of the conventional disk drive components gives rise to a hard disk drive that is bulky.
Since the latest advances in portable computers require slim hard disk drives and other data storage devices, this quality also renders the conventional hard disk drive obsolete.
Thus, it is an objective of the present invention to provide a slim data storage device, such as a hard disk drive suitable for use in a portable computer. It is a further objective to provide a slim data storage device in which the operational efficiency is improved.
Summary of the Invention According to a first aspect of the present invention, there is provided a data storage device comprising a data storage medium mounted for rotation about an axis, a read/write head for recording data on or reproducing data from the data storage medium, a printed circuit board and a motor for rotating the data storage medium about its axis, in which the motor coil is formed on the printed circuit board.
This data storage device employs a motor to produce the required rotational force which is significantly different from conventional devices. In the motor of the present invention, the motor coil is formed on the printed circuit board. Thus, the motor coil requires far less room than that hitherto and the device is substantially slimmer.
In a second embodiment of the present invention, there is provided a data storage device comprising a data storage medium mounted for rotation about an axis, an actuator including a read/write head for recording data on or reproducing data from the data storage medium, and mounted to pivot about an axis so as to move the read write head across the data storage medium, a printed circuit board and a motor for pivoting the actuator about its axis, in which the motor coil is formed on the printed circuit board.
The actuator motor of the second embodiment also differs substantially from the conventional. In contrast to conventional devices, the motor coil of the second embodiment is formed on the printed circuit board.
This arrangement means that the actuator motor coil occupies less space and, hence, the hard disk drive is slimmer.
In a third aspect of the present invention, the improvements of the first two embodiments are both incorporated. Specifically, the data storage medium motor of the first embodiment and the actuator motor of the second embodiment are both used.
To further reduce the system size and to facilitate manufacture, it is preferred that at least one motor permanent magnet be attached to the bottom of the data storage medium. The permanent magnet may be annular. For similar reasons, the device may include at least one motor permanent magnet attached to the actuator.
For structural simplicity and ease of manufacture, the data storage medium and actuator may each be mounted on a shaft.
In a preferred arrangement, the shafts are formed on the printed circuit board. This arrangement also facilitates assembly and it further reduces the system size.
To protect the data storage device from external conditions, a cover may be provided To increase the operational efficiency of the device and decrease its size, it is preferred that a multi-layer type printed circuit board and multi-layer type or coil be used.
For ease of manufacture, it is further preferred that the multi-layer type coil be a pattern coil. A pattern coil may be manufactured by printing on the PCB.
In a preferred arrangement, the data storage medium is magnetic and the read/write head interacts with the data storage medium by detecting variations in its magnetic field. This arrangement provides a highly efficient means of storing and retrieving data.
To minimize the magnetic field effect on the data storage medium and read/write head, a magnetic field shielding material may be installed. This material may include Ferrite bead, as it is readily available. The material may be installed around the pattern coil. Other possibilities include placing it on the device cover or bonding it to the internal surface of the device cover.
For further reduction in device size, the printed circuit board may include one or more bare chips. Use of the printed circuit board as the base of the device also makes the device slimmer.
Brief Description of the Drawings The invention will now be described by way of example with reference to the accompanying drawings in which: FIG. 1 shows a conventional hard disk drive; FIG. 2 is a cross-sectional view of the conventional hard disk drive taken along the line A-A of FIG 1; FIG. 2A is a plan view of a conventional actuator driver; FIG. 3 illustrates a hard disk drive, according to the present invention; FIG. 4 is a cross-sectional view of this first embodiment, taken along the line A-A of FIG 3; FIG. 5 is a plan view of a circuit substrate of the invention; FIG. 6A and FIG. 6B are schematic diagrams of disks according to the invention; FIG. 7 shows how magnetic field shielding material may be attached to the disk; FIG. 7A is an alternative embodiment to FIG. 7; FIG. 8 is a cross-sectional view of an actuator according to the invention; and FIG. 9 is a cross-sectional view of a second embodiment of the invention.
Detailed Description of the Invention A typical embodiment of the hard disk drive according to the present invention is illustrated in FIG. 3.
Alternative views of the invention are shown in FIG. 4 (cross-sectional view) and FIG. 5 (detailed view of a circuit substrate). The hard disk drive 10 comprises a printed circuit board (PCB) 11 which carries the circuits and electrical components of the hard disk drive 10 and also forms its base. The printed circuit board 11 is a multi-layer type PCB. Attached to the PCB 11 are a spin shaft 12 and a pivot shaft 13. Pattern coils 14a and 14b are formed around shafts 12 and 13 on the PCB. The pattern coils 14a and 14b are multi-layer type coils and the passage of a current through either coil produces a magnetic field.
An annular permanent magnet 15a is also placed around the spin shaft 12. The interaction of the magnetic field of the permanent magnet 15a with the coil 14a-induced magnetic field produces a rotational force. This force causes a disk 15 mounted on the spin shaft 12 to rotate. The disk 15, which comprises the data storage medium of the device, rotates on a bearing 16a in the spin shaft 12.
The hard disk drive 10 contains a second permanent magnet 17a, which is placed around the pivot shaft 13. The interaction of the magnetic field of permanent magnet 17a with the coil 14b-induced magnetic field also produces a rotational force. This force results in the rotation of an actuator 17 mounted on the pivot shaft 13. The actuator 17 rotates on a bearing 16b in the pivot shaft 13.
Attached to one end of the actuator 17 is a read/write head 18. The read/write head 18 records data on or reproduces data from the disk 15. This task is accomplished by detecting variations in the magnetic field of the disk 15.
To minimize the magnetic field effect on the disk 15 and read/write head 18, a magnetic field shielding material (e.g., Ferrite bead) is installed around the pattern coil 14a. The magnetic field shielding material protects the disk 15 and read/write head 18 from the magnetic fields given off by the permanent magnet 15a and the pattern coil 14a.
The hard disk drive 10 further comprises a cover 20 fixed at each end to the PCB 11. The cover 20 protects the hard disk drive 10 from external conditions.
FIG. 6a and FIG. 6b show how the permanent magnet 15a may be attached to the disk 15. In one arrangement, as shown in FIG. 6a, the permanent magnet 15a is an annulus and it is placed around the central aperture of the disk 15. The permanent magnet 15a is placed so that each of its poles lies between two unlike poles. In another arrangement, as shown in FIG. 6b, the permanent magnet 15a is divided into several parts and the divided parts are arranged so that like poles face each other.
FIG. 7 shows how a magnetic field shielding material 19 may be bonded to the disk 15. In this case, the magnetic field shielding material is fixed to the upper surface of the disk 15. Its function is to shield the disk 15 from the magnetic field of permanent magnet 15a, which is attached to the bottom of the disk 15.
The attachment of the permanent magnet 15a on the disk 15 as shown in FIG. 7A uses an attachment groove 15b formed by indenting the surface of the disk in the shape of a concentric circle to a predetermined depth conforming to the width of the permanent magnet 15a, which in turn is attached in the groove 15b by bonding. The magnetic poles of the permanent magnet 15a may be arranged in any of the previously described ways. To prevent the magnetic field produced by the permanent magnet 15a, from interfering with other components, the permanent magnet 15a is attached beneath the surface of the disk 15 by bonding, and a magnetic field shielding material 19 is attached to the disk surface.
FIG. 8 shows the structure of the actuator 17 and the actuator motor. The actuator motor comprises the permanent magnet 17a, attached to the actuator 17 and a pattern coil 14b. The pattern coil 14b is formed around the pivot shaft 13. It is formed by printing a signal pattern on the PCB 11. The pattern coil 14b is a multi-layer type coil; a multi-layer structure contains a greater number of coil turns than the single layer type of the prior art.
FIG. 9 shows a second embodiment of the present invention.
In this embodiment, a magnetic shielding material 19a is bonded to the internal surface of the cover 20. The magnetic shielding material 19a is placed directly opposite the magnetic shielding material 19, which is fixed to the PCB 11. The purpose of magnetic shielding material 19a is to minimize the magnetic field effect on the disk 15.
Manufacture of the disk drive 11 is a straightforward process. The magnetic shielding material 19 is in installed around the pattern coil 14a, which is printed on the PCB 11. Next, the disk 15, to which the permanent magnet 15a is fixed, is mounted on the spin shaft 12 of the PCB 11. The disk 15 is placed so that the permanent magnet 15a is directly opposite the pattern coil 14a. At the same time that the disk 15 is mounted, the bearing 16a on which it rotates is placed inside the spin shaft 12. Then the actuator 17, to which the permanent magnet 17a is attached, is mounted on the pivot shaft 13. The actuator 17 is placed so that the permanent magnet 17a is directly opposite the pattern coil 14b. Finally, the cover 20 is attached and the screws are locked into the screw holes on the spin shaft 12 and pivot shaft 13.
When power is supplied to the hard disk drive 10, a motor drive in the PCB 11 generates a current. Passage of this current through the pattern coil 14a induces a magnetic field. The interaction of this coil-induced magnetic field with the magnetic field generated by permanent magnet 15a produces a rotational force. This force causes the rotation of the disk 15 around the spin shaft 12; the disk 15 rotates on the spindle bearing 16a inside the spin shaft 12. Because the pattern coil 14a is a multi-layer type coil, it contains more coil turns than the single layer type coil in the prior art. Hence, the rotational force on the disk 15 is greater and the disk rotates more rapidly.
The current generated by the motor drive of the PCB 11 also passes through the pattern coil 14b. Again, interaction with this coil-induced magnetic field and the magnetic field of permanent magnet 17a produces a rotational force.
Because pattern coil 14b is a multi-layer type coil, the rotational force produced is stronger than in the conventional arrangement. The rotational force causes the actuator 17 to move about the pivot shaft 13. Pivotal motion of the actuator 17 on the bearing 16b causes the read/write head 18 to move across the disk 15. As the read/write head 18 moves across the disk 15, either data recording or data reproduction takes place. The operation of the read/write head 18 takes place more rapidly than in the prior art because of the greater speed with which both the disk 15 and read write head move. Both the disk 15 and read/write head 18 are protected from the magnetic field effect during operation by the magnetic field shielding material.
Thus with a very simple system, the hard disk drive can be made substantially slimmer and its operational efficiency improved.
The system components are all readily available or easily made. For example, the printed circuit board is a standard piece of electronic equipment and the pattern coils are easily manufactured by printing them on the PCB. The structural simplicity facilitates manufacture as well as reducing the device size. Ease of manufacture reduces production cost while the size and efficiency of the disk drive means it is suitable for use in the most modern portable computers. This contrasts with the conventional arrangement where the components were complex and the disk drive bulky, rendering the drive obsolete for modern use.

Claims (21)

CLAIMS:
1. A data storage device comprising: a data storage medium mounted for rotation about an axis; a read/write head for recording data on or reproducing data from the data storage medium; a printed circuit board; and a motor for rotating the data storage medium about its axis, in which the motor coil is formed on the printed circuit board.
2. A data storage device comprising: a data storage medium mounted for rotation about an axis; an actuator including a read/write head for recording data on or reproducing data from the data storage medium, and mounted to pivot about an axis so as to move the read/write head across the data storage medium; a printed circuit board; and a motor for pivoting the actuator about its axis in which the motor coil is formed on the printed circuit board.
3. The device of claim 1 including an actuator to which the read/write head is attached, and mounted to pivot about an axis so as to move the read/write head across the data storage medium, and further including a motor for pivoting the actuator about its axis, in which the motor coil is formed on the printed circuit board.
4. The device of any one of claims 1-3 in which at least one motor permanent magnet is attached to the bottom of the data storage medium.
5. The device of claim 4 in which the magnet is annular.
6. The device of any one of claims 2-5 in which at least one motor permanent magnet is attached to the actuator.
7. The device of any one of claims 1-6 in which the data storage medium and the actuator are each mounted on a shaft.
8. The device of claim 7 in which the shafts are formed on the printed circuit board.
9. The device of any one of claims 1-8 in which a cover is provided for protecting the data storage device.
10. The device of any one of claims 1-9 in which the printed circuit board is a multi-layer type PCB, and the motor coil is a multi-layer coil.
11. The device of any one of claims 1-10 in which the motor coil is a pattern coil.
12. The device of any one of claims 1-11 in which the data storage medium is magnetic and the read/write head operates by detecting changes in the data storage medium magnetic field.
13. The device of claim 12 in which a magnetic field shielding material is installed to minimize the magnetic field effect on the storage medium and read/write head.
14. The device of claim 13 in which the magnetic field shielding material is Ferrite bead.
15. The device of claim 13 or 14 in which magnetic shielding material is placed around the pattern coil.
16. The device of any one of claims 13-15 in which magnetic shielding material in placed on the device cover.
17. The device of any one of claims 12-15 in which magnetic shielding material is bonded to the internal surface of the device cover.
18. The device of any one of claims 1-17 in which the printed circuit board includes one or more bare chips.
19. The device of any one of claims 1-18 in which the printed circuit board forms the base of the device.
20. A data storage device substantially as described herein with reference to FIGs. 3-9 of the accompanying drawings.
21. A data storage device according to any preceding claim which is a hard disk drive.
GB9621464A 1995-11-30 1996-10-15 Data storage device Expired - Lifetime GB2307769B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1019950045690A KR0153883B1 (en) 1995-11-30 1995-11-30 Hard disk device
KR1019950046429A KR0183153B1 (en) 1995-12-04 1995-12-04 Disk moving apparatus of hard disk drive
KR1019950046425A KR0183154B1 (en) 1995-12-04 1995-12-04 Actuator moving apparatus of hard disk drive

Publications (3)

Publication Number Publication Date
GB9621464D0 GB9621464D0 (en) 1996-12-04
GB2307769A true GB2307769A (en) 1997-06-04
GB2307769B GB2307769B (en) 1998-07-08

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ID=27349255

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9621464A Expired - Lifetime GB2307769B (en) 1995-11-30 1996-10-15 Data storage device

Country Status (1)

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GB (1) GB2307769B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3988024A (en) * 1974-06-14 1976-10-26 Tokyo Shibaura Electric Co., Ltd. Turntable apparatus
GB2161313A (en) * 1984-07-03 1986-01-08 Staar Sa Drive motor with axially moving rotor for disc player
US4851731A (en) * 1987-03-11 1989-07-25 Sony Corporation Structure of a flat-type brushless DC motor
US5247409A (en) * 1990-10-26 1993-09-21 Teac Corporation Disk drive pin support mechanism in a rotating disk data storage apparatus
EP0637022A2 (en) * 1993-07-26 1995-02-01 Hewlett-Packard Company Recording/reproducing device employing device housing and printed circuit board and electronics as structural and functional part of media drive motor
US5424891A (en) * 1990-11-29 1995-06-13 Mitsubishi Denki Kabushiki Kaisha Leakage flux shielding structure of disk unit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1516678A (en) * 1975-06-20 1978-07-05 Ibm Transducer support and actuator for disc recording and/or reproducing apparatus
AU6818794A (en) * 1993-06-09 1995-01-03 Maxtor Corporation Rolling actuator bearing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3988024A (en) * 1974-06-14 1976-10-26 Tokyo Shibaura Electric Co., Ltd. Turntable apparatus
GB2161313A (en) * 1984-07-03 1986-01-08 Staar Sa Drive motor with axially moving rotor for disc player
US4851731A (en) * 1987-03-11 1989-07-25 Sony Corporation Structure of a flat-type brushless DC motor
US5247409A (en) * 1990-10-26 1993-09-21 Teac Corporation Disk drive pin support mechanism in a rotating disk data storage apparatus
US5424891A (en) * 1990-11-29 1995-06-13 Mitsubishi Denki Kabushiki Kaisha Leakage flux shielding structure of disk unit
EP0637022A2 (en) * 1993-07-26 1995-02-01 Hewlett-Packard Company Recording/reproducing device employing device housing and printed circuit board and electronics as structural and functional part of media drive motor

Also Published As

Publication number Publication date
GB2307769B (en) 1998-07-08
GB9621464D0 (en) 1996-12-04

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