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WO1990001767A1 - Mecanisme de verrouillage d'une tete magnetique - Google Patents

Mecanisme de verrouillage d'une tete magnetique Download PDF

Info

Publication number
WO1990001767A1
WO1990001767A1 PCT/US1989/003270 US8903270W WO9001767A1 WO 1990001767 A1 WO1990001767 A1 WO 1990001767A1 US 8903270 W US8903270 W US 8903270W WO 9001767 A1 WO9001767 A1 WO 9001767A1
Authority
WO
WIPO (PCT)
Prior art keywords
head arm
locking mechanism
swing plate
magnet
plate
Prior art date
Application number
PCT/US1989/003270
Other languages
English (en)
Inventor
Edward Lee
Kai C. K. Sun
Original Assignee
Microscience International Inc.
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 Microscience International Inc. filed Critical Microscience International Inc.
Publication of WO1990001767A1 publication Critical patent/WO1990001767A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/16—Supporting the heads; Supporting the sockets for plug-in heads
    • G11B21/22—Supporting the heads; Supporting the sockets for plug-in heads while the head is out of operative position

Definitions

  • the present invention relates to locking mechanisms for holding a head arm assembly in place when power is off.
  • Disk drives have a head arm for positioning a head above a disk to read data from the disk and write on to the disk.
  • This head arm is moved with either a rotary or linear actuator.
  • the head arm When power is removed, the head arm is moved so that the heads are placed at the edge of the disk or near the center of the disk away from the data in the middle portion of a disk. This is done to prevent the heads from contacting the disk near the data portions and damaging the data.
  • a capacitor is discharged or a motor winding is switched to provide the necessary power to move the head arm assembly to its parking position.
  • a limit stop is provided to stop the movement of the head arm assembly, incorporating a shock absorption mechanism to absorb the shock of a fast moving head arm as it engages the limit stops.
  • a solenoid actuated brake or locking mechanism is typically used to hold the head arm in place after it contacts the stop.
  • a magnet is shown in U.S. Patent 4,594,627.
  • the magnet is used to hold the head arm assembly in place when it contacts the mechanical stop.
  • the magnet is mounted on the bobbin of a linear motor for a linear head arm actuator.
  • An alternate method to the mechanical latching mechanism is the use of a weaker magnet whose field will not extend as far, and thus will not interfere with the read/write operation.
  • the head arm assembly may become separated from the magnet when the disk drive housing receives a large shock.
  • the present invention provides a magnet positioned to attract and hold a portion of a head arm in a disk drive assembly.
  • the magnet is mounted by a resilient mechanism to a support structure so that there is some .overtravel when the head arm assembly contacts the magnet, to dampen the impact and prevent the head arm from bouncing away.
  • the present invention is preferably implemented with a swing plate which extends downward from the head arm support structure and is mounted at the top portion by a spring-loaded screw.
  • a magnet is mounted on the bottom portion of the swing plate, and interacts with a preamble iron pin coupled to the voice coil of the head arm assembly.
  • a pair of locating pins extend through holes in the mid-portion of the swing plate to guide the movement of the swing plate.
  • the swing plate is levered about a short intermediate plate between it and the support structure which extends approximately one-third of the length of the swing plate. The length of this intermediate plate is chosen to give an optimum compromise between the amount of overtravel in the swing plate and the holding force of the swing plate and magnet arrangement.
  • the swing plate is a permeable plate to which the magnet is mounted. This permeable plate flattens out the flux field from the magnet so that the field does not extend too far and interfere with the movement of the head arm during read/write operations.
  • a separate, disk-shaped magnet is used with a cylindrical shaped main magnet to flatten out the flux field.
  • the present invention improves over the prior art in two respects.
  • the magnet is resiliently mounted so that it provides a damping, overtravel movement, so that a weaker magnet can be used to hold the head arm assembly, and thus reduce the possibility of interference with the head arm during read/write operations. A capture and holding range is thereby established.
  • Figure 1 is a perspective view of a disk drive head arm assembly showing the position of the magnetic locking swing- plate
  • Figure 2 is a perspective view, partially broken away, of the swing plate of the present invention.
  • Figures 3A and 3B show the shape of the magnetic flux without and with the permeable plate, respectively.
  • Figure 4 is a side view of an alternate embodiment of the present invention using a cylindrical and disk shaped magnet.
  • Figure 1 shows a head arm assembly 10 which positions a read/write head 12 over a disk 14 in a stack of disks.
  • a head arm 16 rotates about a pivot 18 coupled to a head arm support structure 20.
  • Voice coil 22 moves between magnets 24 to cause movement of head arm 16 about pivot 18.
  • voice coil 22 is moved so that a pin 26 comes in contact with a magnet on a swing plate 28 to hold the head arm in position away from the data tracks on disks 14. Swing plate 28 is shown in more detail in Fig. 2.
  • swing plate 28 is mounted to support structure 20 with a screw 30. Swing plate 28 is spring loaded by a spring 32. An intermediate plate 34 magnetically isolates swing plate 28 from support structure 20. A pair of guide pins 36 extend through holes in plate 28 to guide the movement of plate 28. A magnet 38 coupled to the bottom end of swing plate 28 attracts an iron pin 26 affixed on a mounting structure 39 for voice coil 22.
  • a stop 40 made of an energy absorbing material is coupled to structure 20 to contact voice coil structure 22 essentially simultaneously with pin 26 contacting swing plate 28. This provides additional damping to the movement of swing plate 28.
  • voice coil 22 may bounce backwards, but swing plate 28 will follow it and will swing in the opposite direction, pivoting about a bottom edge 42 of plate 34. This pivoting movement allows the swing plate with magnet 38 to stay in contact with pin 26, and thus prevent the voice coil structure from bouncing off of the swing plate and maintain contact when the disk drive housing receives a shock.
  • Swing plate 28 is made up of permeable material which serves to flatten the magnetic field from magnet 38. This effect is shown in Figs. 3A and 3B.
  • Figure 3A shows the flux lines from magnet 38 without plate 28.
  • Figure 3B shows how plate 28 flattens the flux on the left side of magnet 38, so that the flux lines do not extend as far towards pin 26 as they would in the configuration of Fig. 3A.
  • the magnetic field will not interfere with pin 26 until pin 26 is very close to plate 28. This prevents the magnetic lock from interfering with the movement of the head arm assembly during the read/write operations.
  • the holes through which pins 36 extend are made long enough in the vertical direction so that they do not interfere with the movement of the plate. The pins guide the plate so that it does not move side to side.
  • Figure 4 shows an alternate embodiment of the present invention which uses a cylindrical magnet 42 coupled to a disk-shaped magnet 44.
  • Magnet 44 serves to flatten the field from cylindrical magnet 42, thus allowing a stronger magnet to be used without its field extending to interfere with the movement of coil 22 during read/write operations.
  • a resilient stop 46 is included.
  • Magnet 42 is mounted with a spring 48 to allow it to move.
  • a stop 50 prevents disk shaped magnet 44 from being pulled along with coil 22 away from the stop mechanism.
  • the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
  • a different resilient mechanism could be used to mount the magnet 38 rather than swing arm 28, such as a leaf spring.
  • recesses in the swing plate could be provided to interact with projections in the position of pins 36. Accordingly, the disclosure of the preferred embodiments of the invention is intended to be illustrative, but not limiting, of the scope of the invention which is set forth in the following claims.

Landscapes

  • Moving Of Heads (AREA)

Abstract

La présente invention concerne un aimant (38) positionné pour attirer et tenir une portion (26) d'un bras avec tête d'une unité à disque. L'aimant est monté à l'aide d'un mécanisme résilient (28) sur une structure de support de sorte qu'il y a un certain mouvement perdu lorsque l'assemblage de bras avec tête entre en contact avec l'aimant pour amortir l'impact et empêcher le bras avec tête de rebondir et s'éloigner, de manière à maintenir le contact lorsque l'unité à disque reçoit un choc de l'extérieur.
PCT/US1989/003270 1988-07-29 1989-07-28 Mecanisme de verrouillage d'une tete magnetique WO1990001767A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22616988A 1988-07-29 1988-07-29
US226,169 1988-07-29

Publications (1)

Publication Number Publication Date
WO1990001767A1 true WO1990001767A1 (fr) 1990-02-22

Family

ID=22847849

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/003270 WO1990001767A1 (fr) 1988-07-29 1989-07-28 Mecanisme de verrouillage d'une tete magnetique

Country Status (1)

Country Link
WO (1) WO1990001767A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0573160A1 (fr) * 1992-06-05 1993-12-08 Seagate Technology International Burée d'arrêt et verrou magnétique pour l'utilisation optimale de l'espace disponible sur le disque
WO1996041337A1 (fr) 1995-06-07 1996-12-19 International Business Machines Corporation Dispositif a double verrouillage destine a limiter les mouvements d'un actionneur d'une unite de stockage a acces direct
US5805387A (en) * 1997-03-27 1998-09-08 Seagate Technology, Inc. Mechanism to dampen vibration of a stop pin of a disc drive actuator arm
US5956213A (en) * 1988-01-25 1999-09-21 Seagate Technology, Inc. Latch mechanism for disk drive using magnetic field of actuator magnets

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594627A (en) * 1983-06-28 1986-06-10 Priam Corporation Safety latch for pickup heads and carriage disc drive

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594627A (en) * 1983-06-28 1986-06-10 Priam Corporation Safety latch for pickup heads and carriage disc drive

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5956213A (en) * 1988-01-25 1999-09-21 Seagate Technology, Inc. Latch mechanism for disk drive using magnetic field of actuator magnets
US6429999B1 (en) 1988-01-25 2002-08-06 Seagate Technology Llc Pre-assembled voice coil magnetic assembly and rotatable attachment structure/method to base plate for disc drive
EP0573160A1 (fr) * 1992-06-05 1993-12-08 Seagate Technology International Burée d'arrêt et verrou magnétique pour l'utilisation optimale de l'espace disponible sur le disque
WO1996041337A1 (fr) 1995-06-07 1996-12-19 International Business Machines Corporation Dispositif a double verrouillage destine a limiter les mouvements d'un actionneur d'une unite de stockage a acces direct
US5805387A (en) * 1997-03-27 1998-09-08 Seagate Technology, Inc. Mechanism to dampen vibration of a stop pin of a disc drive actuator arm

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