WO2001008157A1 - Noyau central de disque magnetique - Google Patents

Noyau central de disque magnetique Download PDF

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Publication number
WO2001008157A1
WO2001008157A1 PCT/JP2000/004482 JP0004482W WO0108157A1 WO 2001008157 A1 WO2001008157 A1 WO 2001008157A1 JP 0004482 W JP0004482 W JP 0004482W WO 0108157 A1 WO0108157 A1 WO 0108157A1
Authority
WO
WIPO (PCT)
Prior art keywords
recording medium
magnetic
magnetic recording
spindle
core
Prior art date
Application number
PCT/JP2000/004482
Other languages
English (en)
Japanese (ja)
Inventor
Kengo Oishi
Original Assignee
Fuji Photo Film 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
Application filed by Fuji Photo Film Co., Ltd. filed Critical Fuji Photo Film Co., Ltd.
Publication of WO2001008157A1 publication Critical patent/WO2001008157A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/03—Containers for flat record carriers
    • G11B23/0301—Details
    • G11B23/0307—Positioning or centering features

Definitions

  • the present invention relates to a magnetic disk center core that is fixed to the center of a disk-shaped, particularly large-capacity, flexible magnetic recording medium incorporated in a magnetic disk cartridge or the like.
  • a magnetic disk in which a metal center core is fixed to the center of a flexible magnetic recording medium in which magnetic layers are formed on both sides of a disk-shaped support made of a flexible polyester sheet or the like.
  • a so-called floppy disk is rotated, and a magnetic disk cartridge is provided for performing magnetic recording on the magnetic layer by means of a magnetic head.
  • the magnetic disk cartridge is easy to handle and has low cost. Because of its advantages, it is mainly used as a recording medium for entertainment.
  • the center core supports the magnetic recording medium and defines the center of rotation, and the rotational driving force is transmitted by being held by a chuck portion provided at the tip of the rotary spindle of the drive-side rotary drive means. It is something.
  • the sensor core is formed in a disk shape at the center and a reference surface portion which abuts on the distal end surface of the spindle to perform reference positioning, and is formed in a flange shape on an outer peripheral portion in parallel with the reference surface portion. It has a central portion of a disc-shaped magnetic recording medium and a flange portion to be fixed.
  • the above-described magnetic recording media of a magnetic disk need to be rotated at a high speed in order to secure a transfer rate along with an increase in the recording capacity.
  • the height of the magnetic recording media and the magnetic head for recording / reproducing means that the intended recording / reproducing performance can be secured by strictly maintaining the proper positional relationship. is there.
  • the large-capacity magnetic disk as described above operates the recording / reproducing magnetic head at a high speed, so that the head is in an appropriate state for both sides (SO side, S1 side) of the magnetic recording medium.
  • magnetic heads on both sides are provided on a movable structure that moves up and down like a hard disk.
  • the magnetic head on the S0 side is fixed to the vertical direction, and the magnetic head on the S1 side is Is provided in the movable structure.
  • the outer peripheral portion is slightly lowered on the rotating magnetic recording medium because the S0 side, that is, the lower magnetic head is fixed.
  • the umbrella-shaped deformation is actively generated to secure the head for the fixed magnetic head, and the inner periphery of the magnetic recording medium is fixed as a structure for this purpose. It is known that the flange of the sunshine core is inclined downward.
  • the flexible magnetic recording medium is affected by the weight of the center core even if the center core flange is parallel to the reference plane.
  • the outer peripheral part rotates in an umbrella shape slightly lowered with respect to a plane parallel to the reference plane, and a good head switch for the upper and lower movable magnetic heads as described above is provided. It is difficult to secure the entire magnetic recording media.
  • the magnetic recording medium that rotates in an umbrella shape causes a phenomenon that the rotation height is different between the innermost circumference and the outermost circumference. This is different from a hard disk with a flat rotating surface.
  • the magnetic head moves parallel to the reference plane, and performs recording and reproduction on the recording surface of the magnetic recording medium from the inner circumference to the outer circumference, so that the magnetic recording medium rotates in an umbrella-shaped state as described above.
  • a uniform head offset cannot be obtained for the SO surface and the S 1 surface over the inner and outer peripheries, which may affect the recording / reproducing characteristics.
  • this effect is greater for vertically movable magnetic heads.
  • the inner peripheral portion of the magnetic recording medium should be fixed to the lower surface of the flange.
  • the outer peripheral part of the flange is pressed before the inner peripheral part, and the recording surface of the magnetic recording medium is Distortion is generated in the outer peripheral portion of the nearby flange, and this portion is damaged and deformed, causing surface runout and deterioration during rotation, and may affect the recording / reproducing characteristics.
  • the present invention regulates the rotational shape of the magnetic recording medium during high-speed rotation, thereby expanding the area where head recording is good, and alleviating the occurrence of distortion when the magnetic recording medium is fixed.
  • An object of the present invention is to provide a magnetic core for a magnetic disk.
  • a magnetic disk center core according to the present invention that has solved the above-mentioned problems is provided with a magnetic disk center that is held by a suction force of a magnet disposed at a tip of a spindle and to which a rotational driving force of the spindle is transmitted.
  • a reference surface portion for performing reference positioning by abutting on a tip end surface of the spindle, a suction surface portion facing the magnet of the spindle, and a connecting portion for connecting the suction surface portion and the flange portion,
  • the flange portion is inclined in a direction in which an angle formed by a surface of the reference surface portion parallel to the reference surface and a surface to which the magnetic recording medium is fixed and the connecting portion increases. It is characterized by That.
  • the inclination angle of the flange is 1 degree or less on average. It is preferable that the above-mentioned variation in the inclination angle in the circumferential direction be within 0.5 degrees. Further, the difference in height between the inner peripheral portion and the outer peripheral portion with respect to the reference plane due to the inclination of the flange portion is 100 / zm or less, preferably, or less. It is preferred that
  • the flange for fixing the magnetic recording medium is formed by the connecting surface and the surface on which the magnetic recording medium is fixed with respect to the surface parallel to the reference surface.
  • the inner peripheral portion of the magnetic recording medium when the inner peripheral portion of the magnetic recording medium is pressed against the lower surface of the flange portion with an adhesive or the like by the upward inclination of the flange portion, the inner peripheral side portion is more advanced than the outer peripheral portion of the flange portion.
  • the recording / reproducing characteristics without any unnecessary force acting on the outer periphery of the flange near the recording surface of the magnetic recording medium during the press-fixing, and without being damaged by distortion.
  • the magnetic recording medium can be fixed without affecting the magnetic recording medium.
  • FIG. 1 is a cross-sectional front view of a magnetic disk according to an embodiment of the present invention with a sensor core mounted on a spindle.
  • FIG. 1 is a cross-sectional front view of a magnetic disk core of the present embodiment mounted on a spindle
  • FIG. 2 is an enlarged cross-sectional end view of a half of the core.
  • the drawings do not always correspond to the actual dimensions.
  • the magnetic disk 1 includes a disk-shaped flexible magnetic recording medium 2 and a rotary drive core fixed to the center of the magnetic recording medium 2.
  • the sensor core 3 is held by the suction force of the magnet 13 disposed at the tip of the spindle 10, and the rotational driving force of the spindle is transmitted.
  • the spindle 10 has a center bin 11 protruding from the center of the tip end thereof, an annular projection 12 provided concentrically on the outer periphery of the center bin 11, and an annular shape on the outer periphery. Magnets 13 are installed.
  • the magnetic recording medium 2 has a magnetic layer formed on both sides of a flexible support made of polyethylene terephthalate (PET) or the like, and is provided in a disk shape having a center hole opened.
  • PET polyethylene terephthalate
  • the core 3 is formed by stamping a sheet metal material of a ferromagnetic material such as magnetic stainless steel into a predetermined shape and press-forming (drawing).
  • the sensor core 3 has a disc-shaped reference surface portion 5 formed at the center portion thereof, and a center hole 4 is opened at a rotation center position of the reference surface portion 5.
  • a suction surface 7 is formed in an annular shape at a low position in parallel with the reference surface 5 via a step 6.
  • a flange-shaped flange portion 9 is formed on the outer peripheral portion at a position higher than the reference surface portion 5 and extends outward and is slightly inclined upward, and an inner peripheral edge of the flange portion 9 and the suction surface portion 7 are formed.
  • the outer peripheral edge is connected by a connecting portion 8 rising up in a cylindrical wall shape.
  • a central portion of the disc-shaped flexible magnetic recording medium 2 is fixed to the lower surface of the flange portion 9 with an adhesive or the like. Further, a drive bin hole (not shown) is opened from the reference surface portion 5 to the suction surface portion 7.
  • the lower surface of the flange portion 9, that is, the fixing surface 9a of the magnetic recording medium 2 is parallel to the reference surface 5a (bottom surface) of the reference surface portion 5. It is formed to be inclined with respect to A in a direction in which the angle formed by the fixing surface 9a and the peripheral surface 8a of the connecting portion 8 increases, that is, upward.
  • the angle ⁇ between the fixing surface 9a and the surface A is formed within 1 degree on average. In the circumferential direction of this inclination angle 6> Is preferably within 0.5 degrees.
  • the height difference between the inner peripheral portion and the outer peripheral portion with respect to the surface A due to the inclination of the flange portion 9 is preferably 100 zm or less, more preferably 10 m or less.
  • the magnetic recording medium 2 is fixed to the flange 9 by centering and placing the magnetic recording medium 2 on a jig (not shown), and a fixing surface of the flange 9 in the center hole from above. 9a, the connecting portion 8 of the core 3 coated with an adhesive is inserted, and the fixing surface 9a of the flange 9 is pressed against the inner peripheral portion of the magnetic recording medium 2 to be bonded and fixed. It is. At that time, the inner peripheral portion of the flange portion 9 comes into contact with the surface of the magnetic recording medium 2 before the outer peripheral portion thereof in contact with the crimping, and the outer peripheral portion has a small pressing force and the fixing distortion is reduced.
  • the center bin 4 of the spindle 10 When the center core 3 as described above is charged to the tip of the spindle 10 as shown in FIG. 1, the center bin 4 of the spindle 10 is inserted into the center hole 4 of the reference surface portion 5 of the center core 3. 11 is inserted and the center of rotation is accurately positioned, and the bottom surface of the reference surface 5 abuts against the end surface of the annular protrusion 12 of the spindle 10 to precisely position the height position.
  • the upper end surface of the magnet 13 of the spindle 10 is provided low, and does not come into contact with the bottom surface of the suction surface portion 7 of the core core 3, but faces with a predetermined gap. The force is secured to ensure that the core 3 does not rise during rotation and that the core 3 does not move in the rotation direction.
  • a drive bin (not shown) inserted into a drive pin hole of the center core 3 is provided at the tip of the spindle 10.
  • This drive pin is mainly installed so as to be able to drive a magnetic disk having a lower recording capacity, but exclusively drives the high recording capacity magnetic disk 1 of the present embodiment.
  • the drive bins need not be formed, and the drive core holes are not formed in the sensor core 3 so that the rotational drive force is transmitted only by the suction force of the magnet 13. Even O
  • an upward displacement acts on the inner peripheral portion of the magnetic recording medium 2 when the magnetic disk 1 rotates, and the descending displacement amount due to its own weight of the outer peripheral portion Is reduced from an umbrella shape to a curved shape as a whole, and the amount of displacement of each part of the magnetic recording medium 2 from the inner circumference to the outer circumference from the plane parallel to the reference plane 5a is reduced.
  • the area where the head position is good for the magnetic head moving parallel to the radial direction is increased, and the recording / reproducing characteristics are secured and the reliability is improved.
  • the occurrence of distortion in the outer peripheral portion of the flange portion 9 when the magnetic recording medium 2 is fixed to the above-mentioned flange portion 9 is alleviated, and damage to a portion close to the recording area is prevented, thereby affecting the recording / reproducing characteristics. Can be eliminated.
  • the magnetic disk 1 is rotatably housed in a flat case formed by joining an upper shell and a lower shell formed of, for example, a synthetic resin, and the case has a magnetic head opening.
  • a circular hub hole is opened in such a size that the reference surface portion 5 and the suction surface portion 7 of the center core 3 face each other, and the spindle 10 is inserted.

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)

Abstract

L'invention concerne un noyau central de disque magnétique, qui comprend un centreur (9) situé à la périphérie extérieure, auquel est fixé un support d'enregistrement magnétique analogue à un disque, et une unité de surface de référence (5) en contact avec l'extrémité d'une broche, qui permet de déterminer une position de référence, le centreur (9) étant incliné selon un angle dirigé vers le haut, par rapport à un plan (A) parallèle à ladite surface de référence (5a). Selon l'invention, une zone favorable de contact de la tête peut être étendue grâce à la rotation d'un support d'enregistrement magnétique à vitesse de rotation élevée contrôlée, une distorsion se produisant lorsque le support d'enregistrement magnétique fixé est libéré. L'invention offre d'excellentes propriétés d'enregistrement/de reproduction avec une mémoire de grande capacité.
PCT/JP2000/004482 1999-07-22 2000-07-06 Noyau central de disque magnetique WO2001008157A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP20774199A JP2001035116A (ja) 1999-07-22 1999-07-22 磁気ディスク用センタコア
JP11/207741 1999-07-22

Publications (1)

Publication Number Publication Date
WO2001008157A1 true WO2001008157A1 (fr) 2001-02-01

Family

ID=16544776

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2000/004482 WO2001008157A1 (fr) 1999-07-22 2000-07-06 Noyau central de disque magnetique

Country Status (2)

Country Link
JP (1) JP2001035116A (fr)
WO (1) WO2001008157A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62107483A (ja) * 1985-11-05 1987-05-18 Sony Corp フロツピ−デイスクの加工方法
JPH0411262Y2 (fr) * 1985-06-26 1992-03-19
JPH0437348Y2 (fr) * 1985-11-18 1992-09-02

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0411262Y2 (fr) * 1985-06-26 1992-03-19
JPS62107483A (ja) * 1985-11-05 1987-05-18 Sony Corp フロツピ−デイスクの加工方法
JPH0437348Y2 (fr) * 1985-11-18 1992-09-02

Also Published As

Publication number Publication date
JP2001035116A (ja) 2001-02-09

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