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WO1992010833A1 - Bobbin for supporting disk drive actuator coil - Google Patents

Bobbin for supporting disk drive actuator coil Download PDF

Info

Publication number
WO1992010833A1
WO1992010833A1 PCT/US1991/009097 US9109097W WO9210833A1 WO 1992010833 A1 WO1992010833 A1 WO 1992010833A1 US 9109097 W US9109097 W US 9109097W WO 9210833 A1 WO9210833 A1 WO 9210833A1
Authority
WO
WIPO (PCT)
Prior art keywords
bobbin
peripheral surface
outer peripheral
set forth
coil
Prior art date
Application number
PCT/US1991/009097
Other languages
French (fr)
Inventor
Shirley M. Chessman
Sigmund Williams
Original Assignee
Maxtor Corporation
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
Application filed by Maxtor Corporation filed Critical Maxtor Corporation
Publication of WO1992010833A1 publication Critical patent/WO1992010833A1/en

Links

Classifications

    • 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

Definitions

  • This invention relates generally to a coil bobbin design, and more particularly, the invention relates to a bobbin for supporting an actuator coil mounted to an actuator utilized in a magnetic disk drive.
  • Magnetic disk drive units used for example in computer systems, generally employ actuators which are either of the rotary or linear moving type.
  • Rotary actuators move the head or heads of a read/write assembly in an arc to position a head at a desired track on a disk.
  • Linear actuators move the heads in a straight line over the tracks of the disk.
  • Rotary actuators are generally comprised of an actuator assembly formed with an arm or series of arms and pivotable with or about a pivot shaft.
  • the arm or arms extend radially outwardly from the body of the assembly to support the read/write heads at the free end thereof opposite the shaft.
  • a coil is mounted on a support bracket at an end of the actuator assembly remote from the magnetic heads; and a permanent magnet is fixably positioned near the coil on the actuator assembly.
  • Suitable drive and positioning circuitry is coupled to the coil to supply a drive current thereto. As the coil is energized, magnetomotive forces are generated between the coil and the magnet to drive the actuator and thereby position the heads at the desired track on the disk.
  • the actuator coil wire is wound around a bobbin extending upwardly from the support bracket. Since this prior art bobbin has a uniform outer peripheral surface, in order to retain the coil around the bobbin the actuator coil is glued to the bobbin. This arrangement, however, has proved to be unreliable and inefficient as gluing is difficult, sloppy, and time-consuming. In addition thereto, with inadequate gluing the coil wire can unwind from the bobbin due to the forces acting on the coil. Moreover, after repeated use, the bobbin may fall out or be separated from the coil wire when the actuator is pivotally moved.
  • the present invention relates generally to a stationary bobbin used to support an actuator coil mounted to a disk drive head support apparatus.
  • the bobbin includes a non-uniform outer peripheral surface upon which the actuator coil is wound therearound and supported thereby.
  • the outer peripheral surface is chamfered.
  • Figure 1 is a side elevational view of a head support apparatus having a preferred embodiment of the stationary bobbin of the present invention mounted thereon;
  • Figure 2 is a top view of the stationary bobbin shown in Figure 1;
  • Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2 illustrating a first preferred configuration for the outer peripheral surface of the stationary bobbin of Figure 2;
  • Figure 4 is a top elevational view specifically illustrating the actuator coil wire wound around the stationary bobbin of Figure 2;
  • Figure 5 is a cross-sectional view taken along line 5-5 of Figure 4;
  • Figure 6 is a side elevational view of a second preferred configuration for the outer peripheral surface of the stationary bobbin of Figure 2;
  • Figure 7 is a side elevational view illustrating a third preferred configuration for the outer peripheral surface of the stationary bobbin of Figure 2;
  • Figure 8 is a side elevational view illustrating a fourth preferred configuration for the outer peripheral surface of the stationary bobbin of Figure 2.
  • FIG. 1 a preferred embodiment of a disk drive actuator incorporating a stationary bobbin in accordance with the present invention.
  • the actuator 5 is used to position one or more transducers 10, referred to simply as magnetic read/write heads, at desired tracks provided on respective surfaces of one or more magnetic disks 12.
  • a magnetic disk memory device known to the art as a hard disk drive, such as a Winchester disk drive
  • the teachings of the present invention are equally applicable to other data storage devices in which information is written onto or read from a storage medium.
  • the actuator shown in Figure 1 can be used to position a read and/or write head relative to an optical disk, a laser disk, or the like.
  • the following description is set out in the environment of the hard disk drive device.
  • the head support apparatus 10 has at least two legs 13 (four legs are shown) extending from the distal end 14 of a body 16 containing a bore 18 through which passes a shaft 20 about which the body 16 rotates.
  • a support bracket 22 extends from the opposite end (or proximal end) 24 of the body 16.
  • a stationary bobbin 25 is positioned on top of the support bracket 22 or is mounted within a recess (not shown) of the support bracket.
  • the bobbin 25 supports an actuator coil 26 (as shown in Figures 1 and 4) which, when the actuator is assembled, cooperates with magnets (not shown) to function as a rotary "voice coil” as is well known to those of ordinary skill in the art.
  • the legs 13, body 16 and support bracket 22 of the head support apparatus are formed as a monolithic structure by casting aluminum or some other non-magnetic metal.
  • the stationary bobbin 25 has a non-uniform outer peripheral surface 28 such that the coil 26 is wound therearound and retained thereby.
  • the bobbin is formed of a non- conductive plastic or plastic-like material, such as unreinforced polyetherimide. The bobbin shape conforms to the inside geometry of the coil which is determined by the direction of the wire needed to carry current substantially perpendicular to the expected magnetic flux.
  • the bobbin includes four sides 29a, b, c and d with two sides (i.e., 29b and d) extending in a direction to carry current substantially perpendicularly to the expected magnetic flux and to the direction of movement of the coil.
  • the bobbin and, in turn, the coil may be formed of other configurations, such as circular, triangular, cylindrical, etc., configurations, depending on the type of motion of the actuator (i.e., linear or rotary) and the geometry of the magnets.
  • the outer peripheral surface 28 of the bobbin can be chamfered.
  • the configuration of the outer peripheral surface 28 in Figures 3 and 5 is not only chamfered, but also is formed in a generally outwardly extending V-shape.
  • the outer surface 30 of the coil is shown as being generally flat.
  • the coil outer surface can be generally any shape so long as it conforms to the shape of the bobbin.
  • the outer peripheral surface can be alternatively chamfered in the form of a generally inwardly extending V- shape 32.
  • the outer peripheral surface includes a plurality of upwardly ascending steps 34 terminating at an apex 36 (see Figure 7) .
  • the outer peripheral surface is generally rounded and has a central outwardly extending protrusion 40.
  • the outer peripheral surface 28 of the stationary bobbin can be virtually any non-uniform configuration.
  • a non-uniform outer peripheral surface ensures that the coil will not fall out or separate from the bobbin during movement of the head support apparatus.
  • gluing the coil to the bobbin is not required; although, as aforementioned, some form of adhesive coating of the wound coil, such as varnish, is preferred to improve the mechanical rigidity thereof and to ensure that the bobbin does not separate from the coil.
  • the actuator coil 26 is wound around the bobbin 25 which is placed between two plates, such as a mandrel (not shown) .
  • the mandrel prevents the wound wire from exceeding the thickness of the bobbin.
  • the tension on the wire as it is wound and the preferred adhesive on the wire prevent the wire from unwinding.
  • the chamfer prevents the wound coil from separating from the bobbin when axial forces are exerted to either the bobbin or the coil.

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  • Moving Of Heads (AREA)

Abstract

A bobbin (25) for supporting an actuator coil (26) mounted to a head support apparatus (5) for use in a magnetic disk (12) memory device including a non-uniform outer peripheral surface (28) upon which the actuator coil is wound around and supported thereby.

Description

BOBBIN FOR SUPPORTING DISK DRIVE ACTUATOR COIL
FIELD OF THE INVENTION This invention relates generally to a coil bobbin design, and more particularly, the invention relates to a bobbin for supporting an actuator coil mounted to an actuator utilized in a magnetic disk drive. BACKGROUND OF THE INVENTION
Magnetic disk drive units, used for example in computer systems, generally employ actuators which are either of the rotary or linear moving type. Rotary actuators move the head or heads of a read/write assembly in an arc to position a head at a desired track on a disk.
Linear actuators, of course, move the heads in a straight line over the tracks of the disk.
Rotary actuators are generally comprised of an actuator assembly formed with an arm or series of arms and pivotable with or about a pivot shaft. The arm or arms extend radially outwardly from the body of the assembly to support the read/write heads at the free end thereof opposite the shaft. In certain prior art embodiments, a coil is mounted on a support bracket at an end of the actuator assembly remote from the magnetic heads; and a permanent magnet is fixably positioned near the coil on the actuator assembly. Suitable drive and positioning circuitry is coupled to the coil to supply a drive current thereto. As the coil is energized, magnetomotive forces are generated between the coil and the magnet to drive the actuator and thereby position the heads at the desired track on the disk. Typically, the actuator coil wire is wound around a bobbin extending upwardly from the support bracket. Since this prior art bobbin has a uniform outer peripheral surface, in order to retain the coil around the bobbin the actuator coil is glued to the bobbin. This arrangement, however, has proved to be unreliable and inefficient as gluing is difficult, sloppy, and time-consuming. In addition thereto, with inadequate gluing the coil wire can unwind from the bobbin due to the forces acting on the coil. Moreover, after repeated use, the bobbin may fall out or be separated from the coil wire when the actuator is pivotally moved.
OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a coil bobbin design which avoids the above-described difficulties of the prior art.
It is another object of the present invention to provide a bobbin for supporting an actuator coil of a head support apparatus. It is a further object of the present invention to provide a chamfered bobbin for supporting an actuator coil of a head support apparatus.
It is yet another object of the present invention to provide a bobbin for supporting an actuator coil of a head support apparatus which does not allow the bobbin to fall out or separate from the coil wire when the actuator is pivotably moved.
Various other objects, advantages and features of the present invention will become readily apparent from the ensuing detailed description, and the novel features will be particularly pointed out in the appended claims.
SUMMARY OF THE INVENTION The present invention relates generally to a stationary bobbin used to support an actuator coil mounted to a disk drive head support apparatus. The bobbin includes a non-uniform outer peripheral surface upon which the actuator coil is wound therearound and supported thereby. In a preferred embodiment, the outer peripheral surface is chamfered. BRIEF DESCRIPTION OF THE DRAWINGS
The following detailed description given by way of example but not intended to limit the present invention solely to the specific embodiments described, may best be understood in conjunction with the accompanying drawings in which:
Figure 1 is a side elevational view of a head support apparatus having a preferred embodiment of the stationary bobbin of the present invention mounted thereon; Figure 2 is a top view of the stationary bobbin shown in Figure 1;
Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2 illustrating a first preferred configuration for the outer peripheral surface of the stationary bobbin of Figure 2;
Figure 4 is a top elevational view specifically illustrating the actuator coil wire wound around the stationary bobbin of Figure 2; Figure 5 is a cross-sectional view taken along line 5-5 of Figure 4;
Figure 6 is a side elevational view of a second preferred configuration for the outer peripheral surface of the stationary bobbin of Figure 2; Figure 7 is a side elevational view illustrating a third preferred configuration for the outer peripheral surface of the stationary bobbin of Figure 2; and
Figure 8 is a side elevational view illustrating a fourth preferred configuration for the outer peripheral surface of the stationary bobbin of Figure 2.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT Referring now to the drawings, wherein like reference numerals are used throughout, and in particular to Figures 1-5, there is illustrated a preferred embodiment of a disk drive actuator incorporating a stationary bobbin in accordance with the present invention. The actuator 5 is used to position one or more transducers 10, referred to simply as magnetic read/write heads, at desired tracks provided on respective surfaces of one or more magnetic disks 12. Although the present invention is described in the environment of a magnetic disk memory device, known to the art as a hard disk drive, such as a Winchester disk drive, it will be appreciated that the teachings of the present invention are equally applicable to other data storage devices in which information is written onto or read from a storage medium. For example, the actuator shown in Figure 1 can be used to position a read and/or write head relative to an optical disk, a laser disk, or the like. For simplification, the following description is set out in the environment of the hard disk drive device.
As shown in Figure 1, the head support apparatus 10 has at least two legs 13 (four legs are shown) extending from the distal end 14 of a body 16 containing a bore 18 through which passes a shaft 20 about which the body 16 rotates. A support bracket 22 extends from the opposite end (or proximal end) 24 of the body 16. A stationary bobbin 25 is positioned on top of the support bracket 22 or is mounted within a recess (not shown) of the support bracket. As will be described in more detail below, the bobbin 25 supports an actuator coil 26 (as shown in Figures 1 and 4) which, when the actuator is assembled, cooperates with magnets (not shown) to function as a rotary "voice coil" as is well known to those of ordinary skill in the art. In the preferred embodiment, the legs 13, body 16 and support bracket 22 of the head support apparatus are formed as a monolithic structure by casting aluminum or some other non-magnetic metal. As shown in Figures 2-5, the stationary bobbin 25 has a non-uniform outer peripheral surface 28 such that the coil 26 is wound therearound and retained thereby. In the preferred embodiment, the bobbin is formed of a non- conductive plastic or plastic-like material, such as unreinforced polyetherimide. The bobbin shape conforms to the inside geometry of the coil which is determined by the direction of the wire needed to carry current substantially perpendicular to the expected magnetic flux. In the embodiment illustrated in Figure 2 , the bobbin includes four sides 29a, b, c and d with two sides (i.e., 29b and d) extending in a direction to carry current substantially perpendicularly to the expected magnetic flux and to the direction of movement of the coil. The bobbin and, in turn, the coil, may be formed of other configurations, such as circular, triangular, cylindrical, etc., configurations, depending on the type of motion of the actuator (i.e., linear or rotary) and the geometry of the magnets.
As shown in Figure 3 (see outer solid lines 28) and Figure 5 (see inner dotted lines 28) , in order to securely retain the coil wires adjacent to the bobbin, the outer peripheral surface 28 of the bobbin can be chamfered. The configuration of the outer peripheral surface 28 in Figures 3 and 5 is not only chamfered, but also is formed in a generally outwardly extending V-shape. As shown in Figure 5, in the preferred embodiment, the outer surface 30 of the coil is shown as being generally flat. As aforementioned, the coil outer surface can be generally any shape so long as it conforms to the shape of the bobbin. As shown in Figure 6, the outer peripheral surface can be alternatively chamfered in the form of a generally inwardly extending V- shape 32. In another preferred embodiment, the outer peripheral surface includes a plurality of upwardly ascending steps 34 terminating at an apex 36 (see Figure 7) . In the preferred embodiment of Figure 8, the outer peripheral surface is generally rounded and has a central outwardly extending protrusion 40.
In accordance with the teachings of the present invention, the outer peripheral surface 28 of the stationary bobbin can be virtually any non-uniform configuration. A non-uniform outer peripheral surface ensures that the coil will not fall out or separate from the bobbin during movement of the head support apparatus. Thus, with a'nόn- uniform configuration, gluing the coil to the bobbin is not required; although, as aforementioned, some form of adhesive coating of the wound coil, such as varnish, is preferred to improve the mechanical rigidity thereof and to ensure that the bobbin does not separate from the coil.
The actuator coil 26 is wound around the bobbin 25 which is placed between two plates, such as a mandrel (not shown) . The mandrel prevents the wound wire from exceeding the thickness of the bobbin. The tension on the wire as it is wound and the preferred adhesive on the wire prevent the wire from unwinding. The chamfer prevents the wound coil from separating from the bobbin when axial forces are exerted to either the bobbin or the coil.
While the present invention has been particularly shown and described with reference to certain preferred embodiments, it will be readily appreciated by those of ordinary skill in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention. For instance, although the preferred embodiment is described with reference to a bobbin design for supporting an actuator coil mounted to an actuator utilized in a magnetic disk drive, this bobbin design is applicable to all coils wound around a form or bobbin that in turn become a permanent part of the coil. It is intended that the appended claims be interpreted as including the foregoing as well as such various other changes and modifications.

Claims

HAT IS CLAIMED IS:
1. A bobbin for supporting an actuator coil mounted to a head support apparatus for use in a magnetic disk memory device having a non-uniform outer peripheral surface upon which the actuator coil is wound therearound and supported thereby.
2. The bobbin as set forth in claim 1, wherein said outer peripheral surface is chamfered.
3. The bobbin as set forth in claim 1, wherein said outer peripheral surface is of a generally outwardly extending V-shape.
4. The bobbin as set forth in claim 1, wherein said outer peripheral surface is of a generally inwardly extending V-shape.
5. The bobbin as set forth in claim 1, wherein said outer peripheral surface is stepped.
6. The bobbin as set forth in claim 1, wherein said bobbin is formed of a non-conductive material.
7. The bobbin as set forth in claim 1, wherein said bobbin is formed of unreinforced polyetherimide.
8. Head support apparatus for use in a magnetic disk memory device, said apparatus comprising: head support means having at least one read/write head mounted thereon; an actuator body; and means for coupling an actuator coil to said body, wherein said coupling means includes a support bracket extending rearwardly of said body, said support bracket having a bobbin mounted thereon formed with a non-uniform outer peripheral surface such that said coil is wound aroun said peripheral surface and supported thereby.
9. The apparatus as set forth in claim 8, wherein said outer peripheral surface is chamfered.
10. The apparatus as set forth in claim 8, wherein said outer peripheral surface is of a generally outwardly extending V-shape.
11. The apparatus as set forth in claim 8, wherein said outer peripheral surface is of a generally inwardly extending V-shape.
12. The apparatus as set forth in claim 8, wherein said outer peripheral surface is stepped.
13. The apparatus as set forth in claim 8, wherein said bobbin is formed of a non-conductive material.
14. The apparatus as set forth in claim 8, wherein said bobbin is formed of unreinforced polyetherimide.
15. The apparatus as set forth in claim 8, wherein said head support means, said body and said support bracket are formed as a monolithic structure.
16. Head support apparatus for use in a magnetic disk memory device, said apparatus comprising means for coupling an actuator coil to the apparatus, said coupling means including a bobbin having a non-uniform outer peripheral surface such that said coil is wound around said outer peripheral surface and supported thereby.
17. The apparatus as set forth in claim 16, wherein said outer peripheral surface is chamfered.
18. The apparatus as set forth in claim 16, wherein said bobbin is formed of a non-conductive material.
19. A bobbin supporting a coil which also becomes a permanent part of the coil having a non-uniform outer peripheral surface upon which the coil is wound therearound and supported thereby.
20. The bobbin as set forth in claim 19, wherein said outer peripheral surface is chamfered.
21. The bobbin as set forth in claim 19, wherein said outer peripheral surface is of a generally outwardly extending V-shape.
22. The bobbin as set forth in claim 19, wherein said outer peripheral surface is of a generally inwardly extending V-shape.
23. The bobbin as set forth in claim 19, wherein said outer peripheral surface is stepped.
24. The bobbin as set forth in claim 19, wherein said bobbin is formed of a non-conductive material.
25. The bobbin as set forth in.claim 19, wherein said bobbin is formed of unreinforced polyetherimide.
PCT/US1991/009097 1990-12-04 1991-12-04 Bobbin for supporting disk drive actuator coil WO1992010833A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US62273290A 1990-12-04 1990-12-04
US622,732 1990-12-04

Publications (1)

Publication Number Publication Date
WO1992010833A1 true WO1992010833A1 (en) 1992-06-25

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Family Applications (1)

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PCT/US1991/009097 WO1992010833A1 (en) 1990-12-04 1991-12-04 Bobbin for supporting disk drive actuator coil

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994017522A1 (en) * 1993-01-21 1994-08-04 Maxtor Corporation Rotary actuator in a magnetic recording system having square wire voice coil
EP0671726A3 (en) * 1994-03-11 1995-12-20 Hitachi Ltd Magnetic disk unit.
GB2341716A (en) * 1998-09-19 2000-03-22 Samsung Electronics Co Ltd Hard disk drive actuator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4544972A (en) * 1981-07-30 1985-10-01 Nippon Telegraph & Telephone Public Corporation Swinging actuators for use in magnetic disc type memory devices

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4544972A (en) * 1981-07-30 1985-10-01 Nippon Telegraph & Telephone Public Corporation Swinging actuators for use in magnetic disc type memory devices

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994017522A1 (en) * 1993-01-21 1994-08-04 Maxtor Corporation Rotary actuator in a magnetic recording system having square wire voice coil
EP0671726A3 (en) * 1994-03-11 1995-12-20 Hitachi Ltd Magnetic disk unit.
GB2341716A (en) * 1998-09-19 2000-03-22 Samsung Electronics Co Ltd Hard disk drive actuator
GB2341716B (en) * 1998-09-19 2000-11-15 Samsung Electronics Co Ltd Hard disk drive actuator
US6252746B1 (en) 1998-09-19 2001-06-26 Samsung Electronics Co., Ltd. Actuator of hard disk drive having improved bobbin

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