WO1998007152A1 - Magnetic disk cartridge - Google Patents
Magnetic disk cartridge Download PDFInfo
- Publication number
- WO1998007152A1 WO1998007152A1 PCT/JP1996/002236 JP9602236W WO9807152A1 WO 1998007152 A1 WO1998007152 A1 WO 1998007152A1 JP 9602236 W JP9602236 W JP 9602236W WO 9807152 A1 WO9807152 A1 WO 9807152A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic disk
- cassette shell
- recess
- elastic plate
- disk cartridge
- 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
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/03—Containers for flat record carriers
- G11B23/033—Containers for flat record carriers for flexible discs
- G11B23/0332—Containers for flat record carriers for flexible discs for single discs, e.g. envelopes
-
- 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
- G11B23/0313—Container cases
- G11B23/0316—Constructional details, e.g. shape
Definitions
- the present invention relates to an improvement of a magnetic disk cartridge, and more particularly, to an improvement of a magnetic disk cartridge having a cassette shell in which a magnetic disk is rotatably incorporated.
- a magnetic disk cartridge is a thin cassette shell composed of a pair of plastic cassette shell halves joined and fixed to each other, and rotatably contains a magnetic disk for magnetically recording analog and digital signals.
- the cassette shell has a substantially square upper surface that is slightly larger than the magnetic disk, a bottom surface that has an opening that exposes the sensor core that supports the center of the magnetic disk, and a narrow width extending between the upper surface and the periphery of the bottom surface. It is formed in a flat prismatic shape (almost square shape) consisting of side surfaces.
- the magnetic disk cartridge is provided with a magnetic head inlet through which magnetic heads for magnetic recording and reproduction are brought in and out of the both sides of the magnetic disk for external contact or close proximity.
- An opening / closing shirt is provided at the insertion slot to prevent dust from entering when not in use.
- a liner made of a nonwoven fabric or the like is attached to an inner surface of the cassette shell facing the magnetic disk so that the surface of the magnetic disk is not damaged when the magnetic disk rotates, and adheres to the surface. It is designed to wipe off dust and the like.
- a new high-density recording system has been developed that has a recording capacity 50 times that of a magnetic cartridge (3.5-inch floppy disk) that has been widely used. In such a magnetic cartridge, the magnetic disk is rotated at a much higher speed than conventional ones in order to increase the recording density and the transfer rate. In addition, when recording and reproducing signals, the magnetic disk is extremely high with respect to the magnetic head. High positional accuracy is required.
- FIG. 3 is a perspective view showing an example of such a high-speed rotating magnetic disk cartridge
- FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.
- This magnetic disk cartridge 1 has a magnetic disk 2 rotatably built inside.
- the cassette shell 3 is composed of a pair of cassette shell halves 4 and 5 that are formed by plastic molding and are divided into upper and lower parts.
- a shirt member 6 having a U-shaped cross section for opening and closing 3a is slidably mounted in a manner urged to a closed position by a spring (not shown).
- FIG. 3 shows a state in which the magnetic head insertion opening 3 a is closed by the shirt member 6 (closed position).
- One of the cassette shell halves 4 located on the lower side in the figure is formed with an opening (circular hole) 4 a for exposing a center core 7 for fixing and supporting the center of the magnetic disk 2, and an inner surface of the cassette shell half 4 is formed.
- a donut-shaped liner 18 made of a nonwoven fabric having a circular hole 8a slightly larger in diameter than the circular hole 4a is attached to 4b by ultrasonic welding or the like.
- the liner 9 is attached in the same manner as the liner 8.
- a magnetic head insertion port 3 a having a size capable of externally facing both sides of the magnetic disk 2 is provided on one side of the cassette shell 3, and a magnetic head for recording and reproducing is provided.
- the head is inserted from the magnetic head inlet 3a, and is configured to perform recording and reproduction in proximity to the magnetic disk 2 rotating at high speed.
- the cassette shell 3 needs to have a predetermined thickness in which the magnetic head can be inserted.
- the magnetic disk 2 that rotates at high speed inside the cassette shell 3 is made of a flexible material, it is necessary to suppress the fluctuation of the magnetic disk 2 during rotation.
- Appropriate dimensions for accuracy generally, the dimensions of the thickness of the magnetic disk 2 and the liners 8, 9 plus some clearance
- the cassette shell 3 needs to have sufficient rigidity, and for that purpose, the cassette shell 3 needs to have a sufficient thickness.
- the thickness of the conventional 3.5 inch floppy —It is necessary to be, for example, twice or more thicker than the thickness of the cassette shell (about 3 mm) of the disk, and accordingly, a pair of cassettes that are joined and fixed together to form a cassette shell
- the thicknesses of the shells 4 and 5 themselves are also quite thick.
- a cassette shell having such a thick structure has a large weight and requires a large amount of material and a long molding time in manufacturing, which not only increases the cost but also increases the thickness.
- the problem is that it is impossible to overlook the negative effect on quality, which is caused by the deformation called sink mark j, which deteriorates dimensional accuracy and appearance.6
- an object of the present invention is to reduce the weight of a cassette shell and improve productivity and quality in the magnetic disk cartridge as described above.
- a concave portion is formed on an inner surface of at least one of the cassette shell halves parallel to the magnetic disk, a part of the cassette shell half is thinned, and a step is formed on a peripheral edge of the concave portion.
- a ring-shaped projection is projected from a portion of the recess corresponding to the flange portion of the core, and a liner is attached to a surface facing the magnetic disk. It is characterized by being fixed to a cassette shell half so as to cover the concave portion in such a manner that it is fixed to the step portion of the concave portion and the central portion is supported by the ring-shaped projection.
- the elastic plate fixing surface of the step portion of the concave portion and the elastic plate supporting surface of the ring-shaped projection are formed on a plane substantially parallel to the magnetic disk, and the elastic plate is set in a state substantially parallel to the magnetic disk. It is preferably fixed to the shell half.
- the magnetic disk cartridge according to the present invention has a reduced thickness by forming a concave portion on the inner surface of the cassette shell half, it is possible to improve productivity and reduce costs by reducing the weight of the cassette shell and shortening the molding time. And the dimensional accuracy inside the cassette shell can be maintained.
- the liner is attached to the surface of the elastic material, the liner can be brought into elastic contact with the surface of the magnetic disk. The surface cleaning effect can be enhanced.
- the projections that support the center of the elastic plate protrude, preventing unnecessary deformation of the elastic plate, and fixing the elastic plate to the cassette shell almost parallel to the magnetic disk. As a result, the contact between the liner and the magnetic disk can be kept better.
- FIG. 1 is a sectional view showing the configuration of an embodiment of a magnetic disk cartridge according to the present invention
- FIG. 2 is an exploded perspective view showing the configuration of an embodiment of a magnetic disk cartridge according to the present invention, in which the magnetic disk is omitted.
- FIG. 3 is a perspective view of a conventional magnetic disk cartridge
- FIG. 4 is a sectional view taken along the line IV-IV in FIG.
- FIG. 1 and 2 show an embodiment of a magnetic disk cartridge according to the present invention.
- FIG. 1 is a sectional view corresponding to FIG. 4, and
- FIG. 2 is an exploded view of a force set shell without a magnetic disk. It is a perspective view.
- the magnetic disk drive cartridge 11 is made up of a cassette shell 13 in which the magnetic disk 2 is rotatably mounted.
- the cassette shell 13 is made of plastic, similar to the cassette shell 3 shown in FIG. It is composed of a pair of upper and lower cassette shell halves 14 and 15 formed by molding.
- One of the cassette shell halves 14 located on the lower side in the figure has a circular opening 14a for exposing the sensor core 7 for fixedly supporting the center of the magnetic disk 2 and a cassette.
- a circular recess 10 is formed concentrically with the opening 14 a on the inner surface of the shell 14, and the central portion of the cassette shell half 14 forming the bottom surface of the recess 10 is a thin portion 14. b.
- a step 10 a is formed along the periphery of the recess 10 along the periphery, and a ring-shaped projection is formed at a position corresponding to the flange 7 a of the center-core 7 at the center of the recess 10. 10b is protruding.
- the upper surface of the concave portion 10 is a metal plate 21 made of metal or plastic or the like.
- the elastic plate 21 of the bracket is covered with the peripheral portion thereof placed on the step portion 10a, and the central portion is supported on the upper surface of the projection 1Ob.
- Fixed to cassette shell half 14 The elastic plate 21 is formed with a circular hole 21a for avoiding the core 7 and a notch 21b for inserting a magnetic head, and on the upper surface of the elastic plate 21, A liner 8 made of a nonwoven fabric or the like is affixed to the surface facing the magnetic disk 2. In the liner 8, a circular hole 8a and a magnetic head insertion notch 8b are formed so as to match the circular hole 21a of the elastic plate 21 and the magnetic head insertion notch 21b.
- the elastic plate 21 comes in contact with the surface of the magnetic disk 2.
- a recess 20 having substantially the same diameter as the recess 10 is also formed on the inner surface of the other cassette shell half 15 located on the upper side, and the cassette shell half 15 forming the top surface of the recess 20 is formed.
- the central part is the thin part 15a.
- a step 20a is also formed along the periphery of the recess 20 along the periphery, and a ring-shaped portion is formed at a position corresponding to the flange 7a of the central core 7 at the center of the recess 20.
- the projection 20b is provided in a protruding manner.
- the lower surface of the concave portion 20 is covered with a thin elastic plate 22 made of metal, plastic, or the like.
- the periphery of the elastic plate 22 is placed on the step portion 20a, and the projection 2
- the elastic plate 22 is fixed to the force set seal half 15 at the peripheral edge thereof in a manner supported by the lower surface of 0b.
- the liner 9 is attached to the lower surface of the elastic plate 22, that is, the surface on the side facing the magnetic disk 2.
- the liner 9 is formed with a circular hole 9 a for avoiding interference with the flange portion 7 a of the center core 7 and a notch 9 b for inserting a magnetic head. Is in contact with the surface of the magnetic disk 2.
- the elastic plate 22 also has the circular hole 22a and the magnetic head insertion notch 22b aligned with the circular hole 9a of the liner 19 and the magnetic head insertion notch 9b. Is formed.
- the area from the magnetic head insertion opening to the recess 1 ° on the side surface of the cassette 14 is also thin, so that the magnetic head can be inserted smoothly.
- the upper surface of the projections 10 b on the cassette seal half 14, that is, the support surface of the elastic plate 21, is a flat surface having almost the same height as the step portion 10 a for fixing the peripheral portion of the elastic plate 21. Then, the elastic plate 21 is supported at the periphery of the circular hole 21 a, so that the elastic plate 21 is kept substantially parallel to the magnetic disk 2.
- the lower surface of the projection 20 b on the cassette shell half 15 side, that is, the support surface of the elastic plate 22, is a flat surface having almost the same height as the step portion 20 a fixing the peripheral portion of the elastic plate 22.
- the elastic plate 22 is supported in a region facing the flange portion 7 a of the center core 7, and the elastic plate 22 is configured to be kept substantially parallel to the magnetic disk 2. I have.
- the cassette shell halves 14 and 15 are formed such that the recesses 10 and 20 are formed on the inner surfaces of the cassette shell halves 14 and 15 to make the cassette shell halves 14 and 15 thinner.
- the productivity and cost can be improved by reducing the weight of the shell 13 and shortening the molding time, and the dimensional accuracy inside the cassette shell 13 can be maintained.
- the recess may be formed in only one of the pair of cassette shell halves 14 and 15, but the recess is formed in both of the cassette shell halves 14 and 15 as in this embodiment. Is preferred.
- the elastic plates 21 and 22 with the liners 8 and 9 adhered to the surface, good contact between the liners 8 and 9 and the magnetic disk 2 can be maintained. The cleaning effect on the surface of the magnetic disk 2 can be enhanced.
- the ring-shaped projections 10b and 2Ob that support the central portions of the elastic plates 21 and 22 are protruded, unnecessary deformation of the elastic plates 21 and 22 can be prevented.
- the elastic plates 21 and 22 are fixed to the cassette shell 13 in a state of being substantially parallel to the magnetic disk 2 to maintain better contact between the liners 18 and 9 and the magnetic disk 2. Can be.
- the concave portions 10 and 20 and the elastic plates 21 and 22 may have not only a circular shape but also a rectangular planar shape.
- the liners 18 and 9 can be attached to the elastic plates 21 and 22 by ultrasonic welding, adhesion using an adhesive, adhesion using an adhesive or a UV curing agent, or the like.
Landscapes
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
- Magnetic Record Carriers (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002262544A CA2262544C (en) | 1996-08-08 | 1996-08-08 | Magnetic disk cartridge |
| EP96926591A EP0918328A4 (en) | 1996-08-08 | 1996-08-08 | MAGNETIC DISC CARTRIDGE |
| PCT/JP1996/002236 WO1998007152A1 (en) | 1996-08-08 | 1996-08-08 | Magnetic disk cartridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP1996/002236 WO1998007152A1 (en) | 1996-08-08 | 1996-08-08 | Magnetic disk cartridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998007152A1 true WO1998007152A1 (en) | 1998-02-19 |
Family
ID=14153656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1996/002236 Ceased WO1998007152A1 (en) | 1996-08-08 | 1996-08-08 | Magnetic disk cartridge |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0918328A4 (ja) |
| CA (1) | CA2262544C (ja) |
| WO (1) | WO1998007152A1 (ja) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62164657U (ja) * | 1986-04-07 | 1987-10-19 | ||
| JPH03185688A (ja) * | 1989-12-13 | 1991-08-13 | Hitachi Maxell Ltd | ディスクカートリッジ |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3833926A (en) * | 1972-11-10 | 1974-09-03 | Arvin Ind Inc | Magnetic disc recorder and cassette with compliant recording disc having flexible support means |
| US3947893A (en) * | 1972-11-10 | 1976-03-30 | Arvin Industries, Inc. | Recording cassette including compliant magnetic recording disc having flexible support means |
| JPS6020374A (ja) * | 1983-07-14 | 1985-02-01 | Hitachi Maxell Ltd | デイスクカ−トリツジ |
| CA1258122A (en) * | 1985-09-27 | 1989-08-01 | Rogers B. Downey | Magnetic disk cassette having internal biasing ribs |
| CA1312375C (en) * | 1987-07-16 | 1993-01-05 | Sadao Kadokura | Magnetic recording disk cartridge |
| US4814926A (en) * | 1987-09-28 | 1989-03-21 | Polaroid Corporation | Flexible disk cassette |
| US5650891A (en) * | 1994-10-18 | 1997-07-22 | Iomega Corporation | Apparatus for performing multiple functions in a data storage device using a single electro-mechanical device |
-
1996
- 1996-08-08 EP EP96926591A patent/EP0918328A4/en not_active Withdrawn
- 1996-08-08 WO PCT/JP1996/002236 patent/WO1998007152A1/ja not_active Ceased
- 1996-08-08 CA CA002262544A patent/CA2262544C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62164657U (ja) * | 1986-04-07 | 1987-10-19 | ||
| JPH03185688A (ja) * | 1989-12-13 | 1991-08-13 | Hitachi Maxell Ltd | ディスクカートリッジ |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP0918328A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2262544C (en) | 2001-03-13 |
| EP0918328A1 (en) | 1999-05-26 |
| CA2262544A1 (en) | 1998-02-19 |
| EP0918328A4 (en) | 1999-08-11 |
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