Patent Application
20060026606
1. Field of the Invention
The present invention relates to a recording disk cartridge comprising a plurality of flexible recording disk media.
2. Description of the Related Art
Conventionally, as a recording disk medium a flexible recording disk medium is known where a magnetic layer is formed on both faces of a disc-form support body consisting of a flexible material such as a polyester sheet. Although the magnetic disk medium has a merit of speedily accessing data in comparison with a magnetic tape, on the other hand, it has a demerit of a memory capacity being small because a recording area thereof is small.
In order to solve the demerit of the flexible magnetic disk medium, it is conventionally disclosed a magnetic disk cartridge for housing a plurality of magnetic disk media in one cartridge case (for example, see JP 2004-22011A).
In this connection, because a flexible magnetic disk medium is low in rigidity thereof, there is a problem that the medium tends to vibrate in a vertical direction for a recording face when rotated. Therefore, in an invention of JP 2004-22011A each magnetic disk medium is made a configuration of being pinched by shutters. Thus by arranging plate members of high rigidity such as the shutters in a vicinity of the magnetic disk medium, the recording face can be stabilized because the medium becomes along the plate members, accompanied with a rotation of the medium.
However, because a magnetic disk cartridge of JP 2004-22011A is configured of movable shutters arranged by four for one magnetic disk medium, there is a problem that the cartridge is complicated in a structure thereof and is difficult to keep a parallelism to the medium. In addition, because the magnetic disk cartridge is mass produced goods, it is preferable to be excellent in assembling ability and productivity. Furthermore, the magnetic disk cartridge is preferable to be high in a degree of freedom in a design change so as to easily set a plurality of kinds thereof where number of magnetic disk media is made three, five, and the like.
In addition, because the magnetic disk cartridge has a possibility of generating an error in recording/reproducing data due to an invasion of dust, it is necessary to prevent the invasion of the dust.
From such a background is strongly requested a recording disk cartridge having a simple structure, excellent in assembling ability, productivity, and dustproof ability, and also easy in changing a number of recording disk media.
A recording disk cartridge of the present invention is one where a plurality of flexible recording disk media are integrally rotatably housed within a cartridge case comprising: a lower plate for configuring a lower wall parallel to the plurality of the recording disk media; at least one inner plate that is stacked and fixed on the lower plate, and partitions the plurality of the recording disk media; and an upper plate that is stacked and fixed on the inner plate, and configures an upper wall of the cartridge case, wherein any adjacent two of the lower plate, the inner plate, and the upper plate are sealingly abutted and fitted each other at periphery of each of the recording disk media.
In accordance with such the configuration, in the recording disk cartridge of the present invention the cartridge case is configured in a form of stacking up the lower plate, the inner plate, and the upper plate. Therefore, a pair of the inner plate and the recording disk medium is made one unit, all inner plates can be made a same part, and therefore, the recording disk cartridge is excellent in productivity. And because the recording disk medium in an assembling process can also be carried by making a lower plate and an inner plate as a substitute of a tray, the recording disk cartridge is excellent also in assembling ability without damaging and staining the medium. In addition, in a case that it is intended to make a specification of changing a number of recording disk media, it is easy to change the specification because it suffices to mainly change a number of inner plates. Furthermore, because an inner plate of a partition plate is fixed as part of the cartridge case, the recording disk cartridge is easy to realize accuracy such as a parallelism to the recording disk media and can heighten a rotational stability especially at a high speed such as 2000 to 8000 rpm.
In addition, because any adjacent two of the lower plate, the inner plate, and the upper plate are sealingly abutted and fitted each other at periphery of each of the recording disk media, an invasion of dust into the cartridge case is prevented.
The recording disk cartridge may also be designed in the cartridge case to form an opening for a head's proceeding, which records and/or reproduces data for the recording disk media, and to further comprise a shutter for opening/closing the opening.
In addition, by the inner plate configuring at least part of a side wall of the cartridge case, it is enabled to minimize a change portion of the cartridge case in changing a number of recording disk media.
Furthermore, by providing a liner for a dust removal on faces opposing each one of the recording disk media of the inner plate, it is enabled to always keep surfaces of the recording disk media clean. It is preferable to provide a liner for the dust removal also on each face opposing the recording disk media out of the lower plate, the upper plate, and members configuring the shutter.
Here it is preferable that the recording disk media are positioned respectively between the lower plate and the inner plate; the inner plate and the upper plate; and between any adjacent two inner plates when there are a plurality of the inner plates.
In addition, it is preferable in a recording disk cartridge that a center core of each of the recording disk media is engaged each other and stacked, and a spacer for keeping a stack distance of the recording disk media between adjacent center cores in the stacked recording disk media is provided.
Furthermore, it is preferable in a recording disk cartridge that at peripheral brim of the inner plate is formed a rib extending in a vertical direction for a stack face of the inner plate, on the lower plate is provided a lower plate rib for abutting with the rib of the inner plate, and on the upper plate is provided an upper plate rib for abutting with the rib of the inner plate
In addition, it is preferable in a recording disk cartridge that the rib comprises a first rib extending upward from the inner plate and a second rib extending downward from the inner plate, wherein in the lower plate rib and the second rib one fits in the other and ends of the one in up and down directions abut with those of the other, and wherein in the upper plate rib and the first rib one fits in the other and ends of the one in the up and down directions abut with those of the other.
Meanwhile, it is preferable in a recording disk cartridge that when there exist a plurality of the inner plates, in a first rib of one inner plate and a second rib of the other inner plate out of adjacent inner plates the one fits in the other and ends of the one in up and down directions abut with the other.
In addition, it is preferable that when a recording disk cartridge is formed with sequentially combining the lower plate, the at least one inner plate, and the upper plate, part of a side wall of the recording disk cartridge is configured of the rib, the lower plate rib, and the upper plate rib.
In addition, it is preferable in a recording disk cartridge that: in the inner plate is formed a notch for exposing a recording face of each of the recording disk media; and when the recording disk cartridge is formed with sequentially combining the lower plate, the at least one inner plate, and the upper plate, a position of the notch becomes the opening.
In addition, it is preferable in a recording disk cartridge that: a lower rotor is positioned between the lower plate and an inner plate positioned just above the lower plate, and a shutter plate for opening and closing the opening is provided at part of a peripheral rim of the lower rotor; and an upper rotor is positioned between the upper plate and an inner plate positioned just below the upper plate,
In addition, it is preferable that a groove for engaging in the shutter plate is provided at a side of the inner plate of a peripheral rim of the upper rotor, and the shutter is formed of the lower rotor and the upper rotor.
Still furthermore, it is preferable that a recording disk cartridge further comprises a coupling shaft for rotating each of the recording disk media with being connected to the center core; a ball bearing rotationally freely the coupling shaft inside the recording disk cartridge formed with sequentially combining the lower plate, the at least one inner plate, and the upper plate; and an energizing mechanism for pressing the center core of the recording disk medium positioned just below the upper plate toward the lower plate.
In addition, it is preferable in a recording disk cartridge that; a dust removal liner is provided on a face opposite to each of the recording disk media; and furthermore, the dust removal liner is further provided on a face of at least one of the shutter, the upper plate, and the lower plate, corresponding to the recording disk medium.
Here will be described an embodiment of the present invention in detail, referring to drawings as needed. In the embodiment will be described a case of adopting a magnetic disk medium as an example of a recording disk medium.
Meanwhile, in a description below, with respect to up/down directions, making it a standard a typical use state of the magnetic disk cartridge, vertical directions for faces of magnetic disk media are called the up/down directions for convenience.
As shown in
In each of the inner plates 20 is formed a rib 22 for abutting with upper/lower plates at a peripheral rim of a flat main plate 21. Part of a right near side of each of the inner plates 20 in
The opening 3 is opened/closed by a shutter 4 that coaxially rotates with the disk stack 40. As shown in
Next will be described each member in more detail.
The lower plate 10 is designed at a peripheral rim of a main plate 11 of a substantially square to mainly form a side wall 13 and a rib 12 for abutting with a lower face of the rib 22 of the lowermost inner plate 20. The side wall 13 is vertically provided in a predetermined range, for example, around one third range of one edge, from one corner of the main plate 11 (near side corner in
A sector portion toward a center of the main plate 11 from one edge 11a (one edge of right near side in
An approximately central one third range of the other edge 11b (one edge of left near side in
The rib 12 is formed so as to protrude upward across all periphery except the side wall 13 and the openings 14, 15 out of a peripheral rim of the main plate 11. At center of the main plate 11 is formed a circular opening 16 for exposing the center core 42 provided inside the lowermost magnetic disk medium 41. At upper rim of the opening 16, across all periphery thereof is formed a rib 17 outside which a central opening 51c formed at center of the lower rotor 51 fits. The rib 17 rotationally freely supports the lower rotor 51.
In addition, on an upper face (inner face) of the main plate 11 is formed a circular lower rotor support groove 18 at a position corresponding to peripheral rim of the lower rotor 51. The lower rotor support groove 18 rotationally freely supports the lower rotor 51 coaxially with the magnetic disk media 41 by engaging in a rib 51d (see
In addition, at four corners of the main plate 11 are formed screw holes 19 where female threads are formed, respectively, with penetrating through the up/down directions.
The main plate 21 of each of the inner plates 20 is substantially a square, and a portion corresponding to one of four corners of the square is designed to be an arc (arc portion 24) one size larger than the magnetic disk medium 41. At one edge (right near side in
In addition, at three corners of the main plate 21, with penetrating through the three corners in the up/down directions, are formed holes 29 through which screw shaft portions 91a of the screws 91 are inserted, respectively.
The upper plate 30 is formed substantially symmetric to the lower plate 10. As shown in
In addition, at a peripheral rim of the main plate 31, across all periphery except the depression 34 is formed a rib 32 protruding downward.
In addition, at four corners of the main plate 31 are respectively formed holes 39 that enables the screw shaft portions 91a of the screws 91 to be penetrated therethrough.
The lower rotor 51 is designed so that: a central opening 51c, a notch 51e, a rib 51d, and the gear 51f are formed on a ring-form lower rotor plate 51a substantially same as the magnetic disk media 41; and a shutter plate 51b is vertically provided at the peripheral rim of the lower rotor plate 51a. The central opening 51c is formed as a circle fitting outside the rib 17, the notch 51e is formed as a sector corresponding to the depression 14a. In addition, the rib 51d is provided downward at a peripheral rim of a lower face of the lower rotor plate 51a, corresponding to the lower rotor support groove 18.
The shutter plate 51b is a blocking member for blocking the opening 3 (see
The upper rotor 52 is designed to be substantially symmetric to the lower rotor 51: the upper rotor 52 comprises an upper rotor plate 52a similar to the lower rotor plate 51a; on the upper rotor plate 52a are formed a central opening 52c fitting outside the rib 37 of the upper plate 30, a notch 52e corresponding to the depression 34, and a rib 52d corresponding to the upper rotor support groove 38. In addition, at a portion adjacent to the notch 52e of a peripheral rim of the upper rotor plate 52a is formed a shutter groove 52b, corresponding to the shutter plate 51b of the lower rotor 51. The lower rotor 51 and the upper rotor 52 are designed to integrally rotate by the shutter groove 52b and upper end rim of the shutter plate 51b engaging.
The upper rotor 52 is rotationally freely supported by the upper plate 30 by the central opening 52c fitting outside the rib 37 of the upper plate 30, and the rib 52d engaging in the upper rotor support groove 38. Meanwhile, the upper rotor 52 is prevented from dropping from the upper plate 30 by a stop member 53. The stop member 53 comprises a cylindrical portion 53a inserted in the rib 37 (see
As an enlarged section drawing shown in
The liners 49 consist of, for example, a non-woven cloth such as a polyester fiber and a blended fabric fiber of rayon and polyester Next will be described a stack structure of the lower plate 10, the inner plates 20, and the upper plate 30.
In the rib 12 of the lower plate 10, as shown in
Similarly, any adjacent two of the inner plates 20, and the uppermost inner plate 20 and the upper plate 30 are stacked by being sealingly abutted and fitted each other. In other words, on an upper face of each of the inner plates 20 is formed a male type step portion 22b where an inside of the upper face is formed higher by one step; at a rib 32 of the upper plate 30 is formed a female type step portion 32a of which outermost periphery protrudes downward by one step. And the male type step portion 22b of one inner plate 20 and the female type step portion 22a of an upper adjacent inner plate 20 are sealingly abutted and fitted each other; the male type step portion 22b of the uppermost inner plate 20 and the female type step portion 32a of the upper plate 30 are sealingly abutted and fitted, and stacked. Thus any adjacent two of the ribs 12, 22, 32 are sealingly abutted and fitted each other, and dust from outside is prevented from invading into the cartridge case 2. In addition, as soon as the lower plate 10, the inner plates 20, and the upper plate 30 are stacked, the side wall 13 of the cartridge case 2 is configured. Furthermore, because the lower plate 10, the inner plates 20, and the upper plate 30 are accurately positioned each other, and respective relative movements go away by being sealingly abutted and fitted each other, a rigidity of the cartridge case 2 improves.
In addition, both of the female type step portion 22a and the male type step portion 22b protrude from the main plate 21 beyond a thickness of the liner 49. Therefore, after affixing the liners 49 on the inner plates 20 and making an assembly, then even if placing it on a work bench, the liners 49 do not contact the work bench, and accordingly, are not contaminated with dust and the like.
Such the configuration of the cartridge case 2 by stacking the inner plates 20 facilitates a change of a number of the magnetic disk media 41; although a height change of the side wall 13 and that of the shutter plate 51b are requested, a number of housing units of the magnetic disk media 41 formed within the cartridge case 2 can be changed only by mainly changing a number of the inner plates 20.
Next will be described the magnetic disk media 41 and a stack structure thereof. The magnetic disk media 41 are ones where magnetic paint is coated on both faces of a resin sheet, for example, such as polyester.
As shown in
A spacer 43 is provided between adjacent center cores 42, keeps a distance of each of the center cores 42, stops a rotation between each of the center cores 42, and functions so that the stacked magnetic disk media 41 integrally rotate. The spacer 43 is mainly configured of a main body portion 43a shaped like a ring from a resin and metallic pins 43b pressed into the main body portion 43a. In the main body portion 43a are formed six penetration holes h at positions corresponding to the small holes 42e of the center core 42, wherein each of the penetration holes h consists of a small diameter hole portion 43c, where the pin 43b is pressed, and a large diameter hole portion 43d that is coaxial with and slightly larger in diameter than the small diameter hole portion 43c. The six penetration holes h are designed to be upside down in any two adjacent ones. In other words, penetration holes h2 of both adjacent penetration holes h1, where each the large diameter hole portion 43d is positioned at an upper side thereof, are arranged so that the large diameter hole portion 43d is positioned at a lower side thereof.
Into each of the small diameter portions 43c is pressed each one pin 43b from upper/lower sides thereof, one end of the pin 43b is positioned at a boundary of the large diameter hole portion 43d and the small diameter hole portion 43c, and the other end thereof protrudes outside the small diameter portion 43c. The large diameter hole portion 43d serves a function of a clearance at ends of pins 43b of adjacent spacers 43.
As shown in
Meanwhile, because at an upper side the uppermost center core 42 has no center core 42 to stop a rotation thereof, at the upper side is arranged a thin top spacer 43′ in thickness where the pin 43b is protruded only downward.
The magnetic disk media 41 thus stacked, namely, the disk stack 40, are stably supported in rotation by a coupling shaft 44, a bearing ball 45, a compression coil spring 46, and a center plate 47.
As shown in
The center plate 47 is a slide member affixed at the center of an inner face of the upper plate 30, that is, on a flat face of an inside of the rib 37. The center plate 47 can be composed of, for example, a material excellent in sliding ability and abrasion resistance such as polyoxymethylene and ultra high molecular weight polyethylene.
Although the bearing ball 45 consists of a sphere made of, for example, steel used for a ball bearing, it may also be composed of a material excellent in sliding ability and abrasion resistance, for example, such as polytetrafluoroethylene and polyoxymethylene. The bearing ball 45 is arranged within the ball holding portion 44b of the coupling shaft 44, abuts with the bottom face of the ball holding portion 44b; and a center of an inner face of the upper plate 30, that is, the center plate 47 by a point contact, and rotationally supports the disk stack 40.
In the compression coil spring 46 one end (upper end) is held by the spring holding portion 44c of the coupling shaft 44; the other end (lower end) abuts with an upper face of the uppermost center core 42, and energizes the stacked center cores 42 to the side of the lower plate 10, that is, to the side of the spindle 65 of the magnetic disk drive. Thus the center cores 42 do not jounce within the cartridge case 2, and the fluctuation of the magnetic disk media 41 is prevented in rotation thereof.
A magnetic disk drive for recoding/reproducing data for the magnetic disk cartridge 1 rotates, as shown in
The magnetic disk cartridge 1 thus described can prevent, in no use thereof as shown in
In addition, the disk stack 40 rotates by the spindle 65 rotating. After then, the swing arms 62 rotate by being driven with an actuator 61, and each of the magnetic heads 63 are moved onto each face of the magnetic disk media 41.
When recording data on the magnetic disk media 41 with the magnetic heads 63, the data is recorded thereon by sending a signal to the magnetic heads 63 by a control circuit not shown; when reproducing data from the magnetic disk medium 41, a signal is output by detecting a change of a magnetic field on the medium 41 with the magnetic heads 63a.
At this time, dust on the magnetic disk media 41 is removed by the liners 49 appropriately touching respective media 41.
After the use of the magnetic disk cartridge 1, the magnetic heads 63 are retracted from the cartridge case 2, thereafter ejects the magnetic disk cartridge 1; thereby the gear 51f is driven by the shutter open gear 67, and the shutter 4 closes the opening 3.
Thus because the magnetic disk cartridge 1 has a plurality of the magnetic disk media 41, data transfer can be performed at a higher speed by simultaneously accessing data with a plurality of magnetic heads 63.
In addition, because the cartridge case 2 is configured by stacking up the inner plates 20, it is easy to perform a specification change of making a number of magnetic disk media 41 a different one. Then, in assembling the magnetic disk cartridge 1, because the magnetic disk media 41 can be handled with being placed on the inner plates 20 and the lower rotor 51 built in the lower plate 10, an occasion of touching the magnetic disk media 41 can be reduced and a quality of the cartridge 1 can be further stablized.
In addition, because each of the inner plates 20 is stacked on the lower plate 10 or another inner plate 20 and is fixed, the magnetic disk cartridge 1 can make it higher a parallelism to the magnetic disk media 41, can stabilize a rotation of the media 41, and enable a higher speed rotation of the media 41, furthermore a higher speed of a data transfer.
Thus, although the embodiment of the present invention is described, the invention is not limited thereto and can be embodied with being changed as needed. For example, although in the embodiment the magnetic disk medium 41 is applied to a recording disk medium, an optical recording medium where data is recorded by light can also be applied thereto.
In addition, although in the embodiment the lower plate 10, the inner plates 20, and the upper plate 30 are fastened and fixed by the screws 91, they can also be integrally fixed by any of adhesion and deposition.
Furthermore, in the cartridge case 2 of the embodiment, although a lower plate and upper plate adjacent to each of the inner plates 20 out of the lower plate 10, the inner plates 20, and the upper plate 30 form the male type step portions 12a, 22b and the female type step portions, respectively, a relationship between the male and the female may be reversed between the lower plate and the upper plate. Only naturally, it is preferable to provide the male type step portions 12a, 22b at the lower plate in order that the liners 49 affixed to the lower faces of the inner plates 20 are prevented from being stained due to contacting a work bench and the like.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2004-223773 | Jul 2004 | JP | national |
