WO1998007154A1 - Magnetic disk cartridge - Google Patents
Magnetic disk cartridge Download PDFInfo
- Publication number
- WO1998007154A1 WO1998007154A1 PCT/JP1996/002239 JP9602239W WO9807154A1 WO 1998007154 A1 WO1998007154 A1 WO 1998007154A1 JP 9602239 W JP9602239 W JP 9602239W WO 9807154 A1 WO9807154 A1 WO 9807154A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic disk
- center
- core
- magnetic
- attracted
- 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.)
- Ceased
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
- G11B23/0014—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 record carriers not specifically of filamentary or web form
- G11B23/0021—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 record carriers not specifically of filamentary or web form discs
- G11B23/0028—Details
- G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving
-
- 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
- G11B23/0312—Driving features
Definitions
- the present invention relates to a magnetic disk cartridge, and more particularly to a structure of a core for supporting a central portion of a magnetic disk in a magnetic disk cartridge in which a magnetic disk is rotatably incorporated in a cassette shell.
- the magnetic disk cartridge is a thin cassette shell with a rotatable magnetic disk for magnetically recording analog and digital signals.
- the cassette shell has an upper surface slightly larger than the magnetic disk and the center of the magnetic disk. It is formed in a flat prismatic shape (substantially square shape) having a bottom surface having an opening for exposing a center core for supporting the core, and a narrow side surface extending between the upper surface and the periphery of the bottom surface.
- the magnetic disk cartridge is provided with a magnetic head inlet through which a magnetic head for magnetic recording / reproduction is brought in and out of the both sides of the magnetic disk for external contact or close proximity.
- An opening / closing shirt member is provided at the entrance to prevent dust and the like from entering when not in use.
- the entrance of the magnetic head of the conventional magnetic disk cartridge is formed of an elongated, generally rectangular opening extending in the radial direction of the magnetic disk on the top and bottom surfaces of the cassette shell.
- the magnetic head inlet does not necessarily need to be provided on the top and bottom surfaces of the cassette shell so as to extend in the radial direction of the magnetic disk, and the magnetic head contacts from outside over the entire radius on both sides of the magnetic disk.
- any shape can be used as long as it can be approached, and it is desirable to make the opening as small as possible to prevent dust and the like from entering the cartridge.
- the degree of freedom in the position and size of the magnetic head insertion port is increased. Is becoming possible.
- a narrow arm-shaped pickup with a small magnetic head fixed at the tip is provided on the narrow side of the cassette shell with a magnetic head entrance that is large enough to reach both sides of the magnetic disk from the outside. Get in and out of here, magnetic It has become possible to perform recording and playback while moving in the radial direction of the disc.
- a magnetic disk cartridge having a magnetic head inlet on the side surface of a cassette seal can incorporate a high-density, large-capacity magnetic disk.
- a magnetic disk cartridge having a magnetic head inlet on the side surface of a cassette seal can incorporate a high-density, large-capacity magnetic disk.
- the center of the magnetic disk is supported by a center core made of a ferromagnetic metal plate member, and the center core is attracted to the magnet of the table and rotated.
- the center core is provided with a square hole at the center and another square hole at an outer periphery thereof for the purpose of preventing eccentricity.
- the present invention solves the above-mentioned problem, that is, rotation slip does not occur in the magnetic core of the magnetic disk due to the attraction force of the connecting magnet of the turntable. It is an object of the present invention to provide a magnetic disk cartridge which is connected in such a manner as to be able to rotate at high speed with little vibration.
- the magnetic disk drive cartridge according to the present invention is provided with a rotatable magnetic disk supported by a disk-shaped center core made of a plate-like member inside a cassette shell, and the center core is opened at the bottom of the cassette shell. Facing the opening, it is attracted to the connecting magnet installed on the evening table and is driven to rotate.
- the cassette shell is slightly larger than the magnetic disk and is almost the same shape as this upper surface and parallel to the upper surface
- the bottom surface is formed in a flat prismatic shape having a narrow side surface extending between the upper surface and the peripheral edge of the bottom surface.
- a magnetic head inlet for approaching the center core is provided, and a center hole in which a center positioning bin of the turntable is engaged is provided in a center portion of the center core.
- the outer peripheral portion is provided with a ring-shaped suction portion having a height different from the opening position of the center hole in a stepped manner, and this suction portion is connected to a coupling magnet arranged in a ring shape on the outer circumference of the turntable. It is characterized by being adsorbed by surface contact.
- the magnetic head entrance is provided on the side surface of the cassette shell, so that the magnetic head entrance can be reduced, and dust and the like enter the power cartridge. Can be effectively prevented.
- the center core of the magnetic disk cartridge is provided with a center hole only at the center position, the positioning pin of the evening table is engaged with the center hole, thereby defining the rotation center of the magnetic disk. Since there is no other hole in the center core, the rotation balance is good, and even at high speed rotation, there is little rotation vibration due to unbalanced load, small modulation, and high performance recording and reproduction.
- the rotational driving force of the evening table is transmitted by a connecting magnet that is attracted to the attracting portion of the center core. Since the power is transmitted efficiently and a large driving force is obtained, no rotational slippage occurs between the transmission core and the installation table even at the start of rotation and during rotation. For good recording and reproduction.
- the suction part of the center core is formed in an annular shape with a stepped height different from the opening position of the center hole. The part that does not want to be in contact with the connecting magnet can be actively escaping, securely attracted to the magnet and seated, and because of the surface contact, a large attractive force can be obtained with the connecting magnet. .
- the center core is formed so that the opening of the center hole and the suction part are formed stepwise with different heights, so that it has high rigidity, little deformation due to external force, and can maintain the shape accuracy after processing
- FIG. 1 is a top perspective view showing a state where a shirt member of the magnetic disk drive according to the present invention is engaged
- FIG. 2 is a bottom view showing a state where the shirt member of the magnetic disk drive is closed
- FIG. 3 is a side perspective view
- FIG. 3 is a cross-sectional view of a main part showing a state in which the magnetic disk is held in rotation.
- FIGS. 1 to 3 show an example of a magnetic disk cartridge according to the present invention.
- FIG. 1 is a perspective view of a top side with a shirt member opened
- FIG. 2 is a perspective view of a bottom side with a shirt member closed.
- FIG. 3 is a cross-sectional view showing a state in which the magnetic disk is held in rotation.
- the cassette seal 2 in the magnetic disk force cartridge 1 of the present example has the magnetic disk 3 rotatably built therein, and is formed by plastic molding. It is formed from a pair of upper and lower cassette shell halves, which are divided into upper and lower parts formed by.
- the cassette shell 2 has a substantially square upper surface 21 slightly larger than the built-in magnetic disk 3, a bottom surface 22 having substantially the same shape as the upper surface 21 and being parallel to the upper surface 21, and a width extending between the periphery of the upper surface 21 and the bottom surface 22. It is formed in a flat prismatic shape having narrow side surfaces 23.
- the center portion of the magnetic disk 3 (recording medium) is supported by a center core 31.
- the center core 31 is formed by pressing a ferromagnetic plate member into a disk shape by pressing or the like, and the center core 31 has a circular opening 2a (the first opening) formed in the bottom surface 22 of the cassette shell 2. (See Fig. 2).
- the evening table 12 When loaded into the magnetic recording / reproducing device, the center core 31
- the evening table 12 is connected and is driven to rotate at high speed.
- the turntable 12 has a taper-shaped positioning bin 13 standing at the center of rotation, and a chuck magnet 14 disposed annularly on the outer peripheral side thereof.
- the shape of the center core 31 is such that a center hole 31a with which the center positioning pin 13 of the turntable 12 is engaged is provided in the center portion, and the outer peripheral portion is stepwise higher than the opening position of the center hole 31a.
- a suction portion 31b having a ring shape and a convex shape is provided. The attracting portion 31b is attracted by surface contact with the connecting magnet 14 arranged annularly on the outer peripheral side of the turntable 12.
- a magnetic head insertion port 6 for externally contacting or approaching the magnetic recording / reproducing head to both sides of the magnetic disk 3 is provided. ing.
- a shut-off member 8 for opening and closing the magnetic head insertion opening 6 is slidably provided.
- the shirt evening member 8 has an upper sleeve portion 81, a shirt evening portion 82, and a lower sleeve portion 83 extending along the upper surface 21, the side surface 23 and the bottom surface 22 of the cassette shell 2 in a U-shaped cross-section. It moves along each said surface.
- the shirt evening portion 82 is provided with a shirt evening opening 82a that closes the magnetic head insertion port 6 during storage and opens the magnetic head entrance 6 during operation.
- the upper part 21, the side part 23, and the bottom part 22 of the cassette shell 2 adjacent to the magnetic head entrance 6 have upper sleeve portions 81, upper shirt portions 82, and lower portions 82 of the shirt evening member 8.
- a shallow recess 9 is formed for receiving and guiding and holding the sleeve 83.
- the shirt member 8 is always urged in a direction to close the magnetic head inlet 6 by a shirt closing panel using a twisted panel (not shown).
- the panel for closing the shirt evening is inserted into the inside of the shell through a spring insertion opening 4a formed at one end of the side surface 4 of the cassette shell 2, and one end of the panel is closed at the side end of the shirt evening portion 82 of the shirt evening member 8.
- the other end is engaged with the inner surface of the shell by the panel engaging portion 82b provided on the shell.
- the panel engaging portion 82b of the shirt member 8 passes through a sliding groove 4b provided on the side surface 4 of the cassette shell 2.
- Guide claws 83a project from the lower sleeve portion 83 of the shirt evening member 8 at two places, and are formed on the bottom surface 22 of the cassette shell 2 along the sliding direction of the shirt evening member 8. The engagement with the groove 22a prevents the shirt member 8 from coming off.
- the shirt member 8 closes the magnetic head insertion port 6 and the magnetic disk cartridge in the state of FIG. 1 is loaded into a magnetic recording / reproducing device (hereinafter referred to as device) for use.
- the shirt member 8 is moved to the open position shown in FIG. 1 by an operation member provided on the apparatus side.
- the shirt member 8 is closed to the position shown in FIG.
- the evening table 12 relatively moves toward the center core 31 exposed on the bottom surface 22 of the cassette shell 2 of the magnetic disk cartridge 1.
- the tip of the positioning bin 13 of the evening table 12 is engaged with the center hole 31a of the center core 31, so that the center core 31, that is, the center position of the magnetic disk 3 is positioned and regulated.
- the attracting surface of the connecting magnet 14 on the outer peripheral portion of the magnetic disk 3 is attracted to the surface of the attracting portion 31b of the center core 31 with a strong force in a ring-like surface contact state. Is driven at high speed with little deviation in the direction of rotation.
Landscapes
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96926594A EP0920012B1 (en) | 1996-08-08 | 1996-08-08 | Magnetic disk cartridge |
| CA002262545A CA2262545C (en) | 1996-08-08 | 1996-08-08 | Magnetic disk cartridge |
| DE69633797T DE69633797T2 (de) | 1996-08-08 | 1996-08-08 | Magnetische plattenkassette |
| PCT/JP1996/002239 WO1998007154A1 (en) | 1996-08-08 | 1996-08-08 | Magnetic disk cartridge |
| US08/708,304 US5761016A (en) | 1996-08-08 | 1996-09-04 | Magnetic disk cartridge |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP1996/002239 WO1998007154A1 (en) | 1996-08-08 | 1996-08-08 | Magnetic disk cartridge |
| US08/708,304 US5761016A (en) | 1996-08-08 | 1996-09-04 | Magnetic disk cartridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998007154A1 true WO1998007154A1 (en) | 1998-02-19 |
Family
ID=26437230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1996/002239 Ceased WO1998007154A1 (en) | 1996-08-08 | 1996-08-08 | Magnetic disk cartridge |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5761016A (ja) |
| EP (1) | EP0920012B1 (ja) |
| WO (1) | WO1998007154A1 (ja) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2243786A1 (en) * | 1997-07-31 | 1999-01-31 | Yasushi Tomita | Recording medium and disc cartridge |
| US6049520A (en) * | 1997-12-30 | 2000-04-11 | Lsi Logic Corporation | Drive mechanism for rotating storage media |
| JP2001035115A (ja) * | 1999-07-22 | 2001-02-09 | Fuji Photo Film Co Ltd | 磁気ディスク用センタコア |
| EP1346354A2 (en) * | 2000-12-14 | 2003-09-24 | Koninklijke Philips Electronics N.V. | Device for scanning an electromagnetically suspended information carrier |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5869372U (ja) * | 1981-11-04 | 1983-05-11 | ソニー株式会社 | 磁気シ−ト装置 |
| JPS62164657U (ja) * | 1986-04-07 | 1987-10-19 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2337396A1 (fr) * | 1975-12-31 | 1977-07-29 | Honeywell Bull Soc Ind | Conditionnement pour disque magnetique |
| US4224648A (en) * | 1978-10-16 | 1980-09-23 | Control Data Corporation | Disc centering |
| JPS6124877U (ja) * | 1984-07-19 | 1986-02-14 | ティーディーケイ株式会社 | デイスクカ−トリツジ |
| US4920441A (en) * | 1985-03-13 | 1990-04-24 | Nippon Telegraph and Telehpone Corp. | Flexible magnetic diskette |
| JPS63122955U (ja) * | 1987-02-02 | 1988-08-10 | ||
| JP2537348Y2 (ja) * | 1988-01-19 | 1997-05-28 | 三井石油化学工業株式会社 | 光ディスク |
| JP3036108B2 (ja) * | 1991-04-25 | 2000-04-24 | ソニー株式会社 | ディスクカートリッジ |
| JP2821060B2 (ja) * | 1992-06-03 | 1998-11-05 | シャープ株式会社 | 光ディスクカートリッジ |
| EP0667616B1 (en) * | 1994-02-15 | 2006-07-19 | Mitsubishi Chemical Corporation | Disc cartridge |
-
1996
- 1996-08-08 WO PCT/JP1996/002239 patent/WO1998007154A1/ja not_active Ceased
- 1996-08-08 EP EP96926594A patent/EP0920012B1/en not_active Expired - Lifetime
- 1996-09-04 US US08/708,304 patent/US5761016A/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5869372U (ja) * | 1981-11-04 | 1983-05-11 | ソニー株式会社 | 磁気シ−ト装置 |
| JPS62164657U (ja) * | 1986-04-07 | 1987-10-19 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP0920012A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0920012A4 (en) | 1999-08-11 |
| EP0920012A1 (en) | 1999-06-02 |
| US5761016A (en) | 1998-06-02 |
| EP0920012B1 (en) | 2004-11-03 |
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