JP2006073135A - Recording disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording disk cartridge capable of stabilizing the rotation of recording disk media even when the number of the recording disk media is increased. <P>SOLUTION: In the recording disk cartridge 1 provided with the plurality of flexible recording disk media 41, a center core 42 for integrally and rotatably holding the plurality of recording disk media 41, and a cartridge case 2 for accommodating the recording disk media 41, the center core 42, and so forth, the recording disk cartridge 1 includes a connection shaft 44 intervening between the cartridge case 2 and the center core 42 and brought into contact with the inner surface of the cartridge case 2 at the tip part 44b and a compression coil spring 46 for performing the energization so that the connection shaft 44 and the center core 42 are separated each other. A recessed part 33 for a bearing for positioning the tip part 44b of the connection shaft 44 on the rotational axis of the center core 42 is formed on the inner surface of the cartridge case 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording disk cartridge provided with a plurality of flexible recording disk media.

  Conventionally, a flexible magnetic disk medium in which a magnetic layer is formed on both sides of a disk-shaped support made of a flexible material such as a polyester sheet is known. This magnetic disk medium has a merit that access to data is faster than a magnetic tape, but has a demerit that a storage capacity is small due to a small recording area.

In order to solve the disadvantages of such a flexible magnetic disk medium, conventionally, a magnetic disk cartridge in which a plurality of magnetic disk media are stored in one cartridge case has been disclosed (see, for example, Patent Document 1). In this technology, one end of a center core that integrally supports a plurality of magnetic disk media from the center hole side is magnetically attracted by the spindle of the magnetic disk drive so that each magnetic disk medium is rotated simultaneously. A plurality of magnetic heads are separately accessed to a plurality of magnetic disk media rotating at the same time, thereby improving the data transfer speed.
Japanese Patent Laid-Open No. 2004-22011

  However, since the magnetic disk cartridge disclosed in Patent Document 1 has a structure in which one end of the center core is only magnetically attracted to the spindle of the magnetic disk drive, the length in the axial direction can be increased by increasing the number of magnetic disk media. There is a problem that the rotational movement becomes unstable as the value of becomes large.

  Therefore, an object of the present invention is to provide a recording disk cartridge that can stabilize the rotation of the recording disk medium even when the number of recording disk media is increased.

  In order to solve the above-described problems, a recording disk cartridge of the present invention includes a plurality of flexible recording disk media, a rotating body that holds the recording disk media so as to be integrally rotatable, the recording disk medium, and the rotating body. A recording disk cartridge including a cartridge case for receiving, a support shaft portion interposed between the cartridge case and the rotating body and contacting an inner surface of the cartridge case at a tip portion; the support shaft portion; An elastic member that urges the rotating bodies in a direction away from each other, and a recess for a bearing that positions the tip end portion of the support shaft portion on the rotating shaft of the rotating body is formed on the inner surface of the cartridge case. It is characterized by being.

  With such a configuration, in the recording disk cartridge of the present invention, the rotating body holding the recording disk medium is pressed against the inner surface side of the cartridge case that does not contact the support shaft portion. Therefore, the rotating body and the recording disk medium do not rattle inside the cartridge case. Further, at the time of rotation, since the tip end portion such as the spherical shape of the support shaft portion is positioned and is in contact with the concave portion for the bearing of the cartridge case, the shaft cores are easily aligned, and shaft shake can be prevented. Therefore, the rotation operation of the recording disk medium and the rotating body can be stabilized.

  Further, in order to easily match the axial center of the support shaft portion, it is desirable to form the tip portion in a spherical shape or form the concave portion in a spherical shape, a conical shape, or a polygonal pyramid shape.

  Furthermore, you may comprise at least any one among the said front-end | tip part and the said recessed part with an abrasion-resistant material. With such a configuration, wear of the distal end portion and / or the concave portion due to the rotation of the support shaft portion is suppressed. Therefore, it is possible to prevent the tip portion and / or the concave portion from being deformed, and to stabilize the rotation operation of the recording disk medium and the rotating body over a long period of time.

  According to the present invention, even when the number of recording disk media is increased, the shaft shake can be prevented, so that the recording disk medium and the rotating body can be stably rotated.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In this embodiment, a case where a magnetic disk medium is employed as an example of a recording disk medium will be described.
FIG. 1 is an exploded perspective view of a magnetic disk cartridge according to an embodiment. FIG. 2 is an external perspective view of the magnetic disk cartridge according to the embodiment. FIG. 3 is a perspective view showing the inner surface of the upper plate, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2B of the magnetic disk cartridge loaded in the magnetic disk drive. FIG. 5 is a partially enlarged view of FIG. 4, and FIG. 6 is an exploded perspective view showing a laminated structure of magnetic disk media. In the following description, the upper and lower directions are based on the typical usage state of the magnetic disk cartridge, and the direction perpendicular to the surface of the magnetic disk medium is referred to as the upper and lower directions for convenience.

  As shown in FIG. 1, a magnetic disk cartridge 1 which is an example of a recording disk cartridge includes a lower plate 10 constituting a lower wall, a plurality of, for example, four inner plates 20, and an upper plate 30 constituting an upper wall. Are sequentially laminated, and these are fastened and fixed by four screws 91 to constitute the cartridge case 2 (see FIG. 2A). Magnetic disk media 41 are arranged between the lower plate 10 and the inner plate 20, between the inner plates 20, and between the inner plate 20 and the upper plate 30. The magnetic disk medium 41 has a disk shape having an opening 41a in the center, and a metal center core 42 is attached to the edge of the opening 41a. Then, the center cores 42 are engaged with each other by the spacers 43 and 43 ′ so that the five magnetic disk media 41 (this stacked and integrated magnetic disk media 41 is referred to as a disk stack 40) rotate integrally. It has become. The center core 42 and the spacers 43 and 43 'correspond to the “rotary body” in the claims.

  Each inner plate 20 is formed with ribs 22 in contact with the upper and lower plates on the outer peripheral edge of a flat main plate 21. A part of the inner plate 20 on the right front side in FIG. 1 is formed with a notch 23 so that the magnetic head 63 (see FIG. 4) can easily move onto the magnetic disk medium 41. The above-described rib 22 is not formed in the notch 23. Therefore, when the inner plate 20 is stacked, an opening 3 is formed on the side surface of the cartridge case 2 as shown in FIG.

  The opening 3 is opened and closed by a shutter 4 that rotates coaxially with the disk stack 40. As shown in FIG. 1, the shutter 4 is configured by combining a lower rotor 51 and an upper rotor 52.

Next, each member will be described in more detail.
The lower plate 10 is configured such that ribs 12 that contact the lower surface side of the ribs 22 of the inner plate 20 and side walls 13 are formed on the outer peripheral edge of the substantially square main plate 11. The side wall 13 is erected in a predetermined range from one corner (the front side corner in FIG. 1) of the main plate 11, for example, about one third of one side, and the inner plate 20 is stacked approximately. It is formed at a height.

A fan-shaped portion from one side 11a (one side on the right front side in FIG. 1) connected to the side wall 13 of the main plate 11 toward the center of the main plate 11 forms a recessed portion 14a that is lowered by one step, and a rib 12 on the outer peripheral edge. Is not formed and is an opening 14. This makes it easy for the magnetic head 63 to enter the cartridge case 2.
Ribs 12 are formed so that the gear 51f of the lower rotor 51, which will be described later, can be exposed in a range of approximately one third of the other side 11b (one side on the left front side in FIG. 1) that continues to the side wall 13 of the main plate 11. Without opening 15. Further, a groove 13 a is formed on the outer side of the side wall 13 on the other side 11 b side so as to be continuous with the opening 15 and along the outer periphery of the lower plate 10. The groove 13a serves as a passage through which the shutter open gear 67 (see FIG. 2A) of the magnetic disk drive enters in the direction indicated by the arrow Ar in FIG. ing.

The rib 12 described above is formed so as to protrude upward over the entire outer periphery of the main plate 11 except for the side wall 13 and the openings 14 and 15.
In the center of the main plate 11, a circular opening 16 is formed for exposing the center core 42 provided in the lowermost magnetic disk medium 41. On the upper edge of the opening 16, a rib 17 is formed over the entire circumference so that a central opening 51 c formed at the center of the lower rotor 51 is fitted. The rib 17 supports the lower rotor 51 so as to be rotatable.
A circular lower rotor support groove 18 is formed at a position corresponding to the outer peripheral edge of the lower rotor 51 on the upper surface (inner surface) of the main plate 11. The lower rotor support groove 18 engages with a rib 51 d (see FIG. 4) formed downward on the outer peripheral edge of the lower rotor 51, so that the lower rotor 51 can be rotated coaxially with the magnetic disk medium 41. To support.
Further, screw holes 19 are formed in the four corners of the main plate 11 so as to penetrate vertically and have female threads.

The main plate 21 of the inner plate 20 has an approximately square shape, and a portion corresponding to one corner of the four corners of the square has an arc shape (arc portion 24) that is slightly larger than the magnetic disk medium 41. ing. And the above-mentioned notch 23 is fan-shaped in the one side (right front side in FIG. 1) which continues to the circular arc part 24. The aforementioned ribs 22 are formed so as to protrude up and down over the entire outer periphery of the main plate 21 excluding the arc portion 24 and the notch 23. At the center of the main plate 21, a central opening 21 c is formed to expose the upper center core 42 and enable connection with the lower center core 42.
In addition, holes 29 are formed in the three corners of the main plate 21 so as to penetrate the screw plate 91a of the screw 91 through the top and bottom.

The upper plate 30 is formed in a shape that is approximately symmetrical with the lower plate 10. As shown in FIG. 3, the upper plate 30 corresponds to the concave portion 34 corresponding to the concave portion 14 a, the rib 37 corresponding to the rib 17, and the lower rotor support groove 18 on the inner surface side of the approximately square main plate 31. An upper rotor support groove 38 is formed. Further, unlike the lower plate 10, the upper plate 30 is formed with a conical recess 33 having a vertex on the rotation axis of the center core 42 inside the rib 37. Note that no opening is formed in the center of the main plate 31 and no side wall corresponding to the side wall 13 is formed.
A rib 32 protruding downward is formed on the outer peripheral edge of the main plate 31 over the entire circumference except for the recess 34.
Further, holes 39 through which the screw shaft portions 91 a of the screws 91 pass are formed in the four corner portions of the main plate 31.

In the lower rotor 51, a central opening 51c, a notch 51e, a rib 51d, and a gear 51f are formed in a ring-shaped lower rotor plate 51a that is approximately the same as the magnetic disk medium 41, and a shutter plate 51b is provided on the outer peripheral edge of the lower rotor plate 51a. It is constructed upright. The central opening 51c is formed in a circular shape that is fitted on the rib 17, and the notch 51e is formed in a sector shape corresponding to the recess 14a. Further, the rib 51d is provided on the outer peripheral edge of the lower surface of the lower rotor plate 51a so as to correspond to the lower rotor support groove 18 downward.
The shutter plate 51b is a shielding member that blocks the opening 3 (see FIG. 2A) and the disk stack 40, and is erected along the outer peripheral edge of the lower rotor plate 51a adjacent to the notch 51e. . The gear 51f is a portion engaged to open and close the shutter 4 (see FIG. 2A) from the outside of the magnetic disk cartridge 1, and is adjacent to the shutter plate 51b on the outer periphery of the lower rotor plate 51a. And formed over a predetermined range.

The upper rotor 52 is configured to be approximately symmetrical with the lower rotor 51. That is, the upper rotor plate 52a is the same as the lower rotor plate 51a. The upper rotor plate 52a includes a central opening 52c that fits around the rib 37 of the upper plate 30, a notch 52e corresponding to the recess 34, and an upper rotor. Ribs 52d corresponding to the support grooves 38 are formed. A shutter groove 52 b is formed in a portion adjacent to the notch 52 e on the outer peripheral edge of the upper rotor plate 52 a so as to correspond to the shutter plate 51 b of the lower rotor 51. By engaging the shutter groove 52b and the upper edge of the shutter plate 51b, the lower rotor 51 and the upper rotor 52 rotate together.
The upper rotor 52 is rotatably supported by the upper plate 30 with the central opening 52c fitted on the rib 37 of the upper plate 30 and the rib 52d engaging the upper rotor support groove 38. The upper rotor 52 is prevented from dropping from the upper plate 30 by the locking member 53. The locking member 53 has a cylindrical portion 53a inserted into the rib 37 (see FIG. 3), and a flange 53b formed at one end of the cylindrical portion 53a. The cylindrical portion 53a opens from the lower side of the upper rotor 52 to the central opening. The portion 52c is inserted and fixed to the rib 37 by ultrasonic welding or an adhesive.

As shown in the enlarged sectional view of FIG. 5, the upper surface of the lower rotor 51, both upper and lower surfaces of the inner plate 20, and the lower surface of the upper rotor 52 are opposed to the magnetic disk medium 41 on the surface facing the magnetic disk medium 41. A liner 49 is affixed over the portion.
The liner 49 is made of non-woven fabric such as polyester fiber or rayon / polyester blend fiber.

Next, a laminated structure of the lower plate 10, the inner plate 20, and the upper plate 30 will be described.
As shown in FIG. 5, the rib 12 of the lower plate 10 is formed so that the inner side is one step higher than the outer side to form a male step 12 a. The rib 22 of the inner plate 20 forms a female step 22a protruding downward at the outermost periphery, and the outer periphery of the male step 12a and the inner periphery of the female step 22a can be fitted. ing. In addition, when the lower plate 10, the inner plate 20, and the upper plate 30 are fastened with screws 91 (see FIG. 1), the upper surface of the male step 12a and the corresponding portion of the lower surface of the inner plate 20 are in close contact with each other. It has become. In this way, the rib 12 of the lower plate 10 and the rib 22 of the inner plate 20 are so-called stamped and fitted, so that dust can be prevented from entering the cartridge case 2 from the outside.
Similarly, the inner plates 20 and the inner plate 20 and the upper plate 30 are also laminated by stamping. That is, the upper side of the inner plate 20 is formed with a male step portion 22b whose inner side is one step higher, and the rib 32 of the upper plate 30 is formed with a female step portion 32a whose outermost periphery protrudes downwardly by one step. Yes. Then, the male step 22b of the inner plate 20 and the female step 22a of the inner plate 20 adjacent on the upper plate 20 are inlayed, and the male step 22b of the inner plate 20 and the female of the upper plate 30 are female. The mold step 32a is laminated by stamp fitting. In this way, the ribs 12, 22, 32 are stamped together to prevent dust from entering the cartridge case 2 from the outside. Further, the side wall of the cartridge case 2 is formed simultaneously with the lamination of the lower plate 10, the inner plate 20, and the upper plate 30.

  The female step 22 a and the male step 22 b both protrude from the main plate 21 higher than the thickness of the liner 49. Therefore, even if the liner 49 is attached to the inner plate 20 to form an assembly and the assembly is placed on a workbench or the like, the liner 49 does not contact the workbench and therefore the liner 49 is contaminated with dust or the like. There is nothing.

  Such a configuration of the cartridge case 2 by stacking the inner plates 20 makes it easy to change the number of magnetic disk media 41. Although it is necessary to change the height of the side wall 13 and the height of the shutter plate 51b, the number of accommodating portions of the magnetic disk media 41 formed in the cartridge case 2 is mainly changed only by changing the number of the inner plates 20. Because it can.

Next, the magnetic disk medium 41 and its laminated structure will be described.
The magnetic disk medium 41 is obtained by applying a magnetic paint on both sides of a resin sheet such as polyester.

  As shown in FIG. 6, the center core 42 is formed by drawing a metal plate with a press into a substantially hat shape. That is, it is mainly composed of a circular bottom plate 42a, a low cylindrical side wall 42b rising from the outer peripheral edge of the bottom plate 42a, and a flange 42c extending from the upper end of the side wall 42b in the outer diameter direction. A center hole 42d is formed at the center of the bottom plate 42a, and six small holes 42e are formed at intervals of 60 ° around the center hole 42d at the periphery.

The spacers 43 are interposed between the adjacent center cores 42 to maintain the distance between the center cores 42 and lock the rotation between the adjacent center cores 42 so that the stacked magnetic disk media 41 are integrated. And function to rotate. The spacer 43 includes a main body 43a formed of resin in a ring shape and a metal pin 43b press-fitted into the main body 43a. The main body 43a has a through-hole h formed of a small-diameter hole 43c into which the pin 43b is press-fitted and a large-diameter hole 43d that is coaxial with the small-diameter hole 43c and has a slightly large diameter. Are formed at positions corresponding to. The six through holes h are adjacent to each other upside down. That is, the through hole h2 adjacent to the through hole h1 where the large diameter hole portion 43d is located on the upper side is arranged so that the large diameter hole portion 43d is located on the lower side.
A pin 43b is press-fitted into each small diameter hole portion 43c from above and below, one end of the pin 43b is located at the boundary between the large diameter hole portion 43d and the small diameter hole portion 43c, and the other end to the outside of the small diameter hole portion 43c. It protrudes. The large-diameter hole 43d functions as a relief of the tip of the pin 43b of the adjacent spacer 43.

Such a spacer 43 is interposed between the adjacent center cores 42 as shown in FIG. The pin 43b protruding to the lower side of the spacer 43 enters the small hole 42e of the lower center core 42 of the spacer 43 and locks relative rotation with the lower center core 42. When the spacer 43 is further below the lower center core 42, the spacer 43 is prevented from being lifted with respect to the center core 42 by entering the large-diameter hole 43 d in the lower spacer 43. The pin 43b protruding above the spacer 43 enters the small hole 42e of the upper center core 42 of the spacer 43 and locks the relative rotation with the upper center core 42. When the spacer 43 is further above the upper center core 42, the tip of the pin 43 b enters the large-diameter hole 43 d in the upper spacer 43.
Since the uppermost center core 42 has no center core to be rotationally locked on the upper side, a spacer 43 'having a thin end face with a pin 43b protruding only on the lower side is disposed thereon.

The magnetic disk media 41 stacked as described above, that is, the disk stack 40, is stably supported by the connecting shaft 44 (support shaft portion), the compression coil spring 46 (elastic member), and the bearing portion 47. .
As shown in FIG. 5, the connecting shaft 44 is for reducing the center swing between the stacked center cores 42 and holding the compression coil spring 46. The connecting shaft 44 includes a shaft portion 44 a, a tip portion 44 b, And a spring holding portion 44c. The shaft portion 44 a has a cylindrical shape that can be inserted into the center hole 42 d of the center core 42. The tip portion 44b is formed in a spherical shape at the upper end of the shaft portion 44a. The distal end portion 44b may be made of a material excellent in slipperiness and wear resistance such as polyoxymethylene resin, polyether / ether / ketone resin, and ultrahigh molecular weight polyethylene. The spring holding portion 44c has a shape in which a bottomed cylinder is turned down on the outer diameter side of the shaft portion 44a, and the compression coil spring 46 is disposed in a cylindrical space between the shaft portion 44a and the spring holding portion 44c. Although the length of the connecting shaft 44 is arbitrary, in this embodiment, the length reaches the center core 42 of the second layer from the bottom, and the center hole 42d of the center core 42 in the lowermost layer is a magnetic disk drive. The spindle 65 is open for entry.

  The bearing portion 47 is a sliding member integrated with the center of the inner surface of the upper plate 30, that is, the concave portion 33 inside the rib 37 by adhesion or pressure bonding. The bearing portion 47 is cut from a material having excellent sliding properties and wear resistance, such as polyoxymethylene resin, polyether / ether / ketone resin, and ultrahigh molecular weight polyethylene so as to correspond to the conical shape of the recess 33. Can be configured. Incidentally, the bearing depth and the taper angle of the concave portion 33 in which the bearing portion 47 is integrated are appropriately selected depending on the size of the distal end portion 44 b of the connecting shaft 44. The tip end portion 44b of the connecting shaft 44 abuts on the taper surface of the bearing portion 47, and the disk stack 40 is rotatably supported. That is, the disc stack 40 can be accurately positioned and rotated by accommodating the bearing portion 47 in a state where the tip end portion 44b of the connecting shaft 44 is positioned. In addition, since wear caused by the sliding contact of the distal end portion 44b with the bearing portion 47 is suppressed, adverse effects due to wear (for example, misalignment due to deformation of the bearing portion 47) can be prevented.

  One end (upper end) of the compression coil spring 46 is held by the spring holding portion 44 c of the connecting shaft 44, and the other end (lower end) is in contact with the upper surface of the uppermost center core 42. , That is, the spindle 65 side of the magnetic disk drive. As a result, the center core 42 does not rattle in the cartridge case 2, and the magnetic disk medium 41 is prevented from shaking during rotation.

As shown in FIG. 4, the magnetic disk drive that records and reproduces data with respect to the magnetic disk cartridge 1 rotates the disk stack 40 by the spindle 65. The spindle 65 adsorbs the lowermost center core 42 by magnetic force and enters the center hole 42 d of the center core 42 to align the axis with the disk stack 40. At this time, since the spindle 65 slightly lifts the center core 42 against the urging force of the compression coil spring 46, each magnetic disk medium 41 includes the lower rotor 51, the inner plate 20, and the like as shown in FIGS. It is located at the center of the space formed between the upper and lower inner plates 20 or between each of the inner plate 20 and the upper rotor 52.
A magnetic head 63 of the magnetic disk drive is provided at the tip of the swing arm 62. The magnetic head 63 is disposed on both surfaces of each magnetic disk medium 41.

  Further, when the disk stack 40 rotates, the front end portion 44b of the connecting shaft 44 is supported by the bearing portion 47 integrated with the concave portion 33 along the circumference thereof, so that the entire surface of the front end portion 44b is supported. Compared with the structure which carries out, the frictional force at the time of rotation can be suppressed and smooth rotation operation | movement can be obtained. Further, since the frictional force at the time of rotation has the effect of sliding the tip end portion 44b around the rotation center, even when the tip end portion 44b is located outside the rotation center, the tip end portion 44b is moved to the rotation center along with the rotation. be able to. Therefore, the disk stack 40 can obtain a stable rotation operation. At this time, since the tip 44b is spherical, the sliding is performed smoothly, and stable rotation can be performed in a short time.

As shown in FIG. 2A, the magnetic disk cartridge 1 as described above is moved to the inside by closing the opening 3 by rotating the shutter 4 counterclockwise in the figure when not in use. Intrusion of dust can be prevented. In use, as shown in FIG. 2B, when the magnetic disk drive is loaded, the shutter open gear 67 of the magnetic disk drive is guided by being fitted in the groove 13a and meshed with the gear 51f. Turn clockwise in the figure.
Then, as the spindle 65 rotates, the disk stack 40 rotates. Thereafter, the swing arm 62 is rotated by being driven by the actuator 61, and the magnetic head 63 is moved onto the magnetic disk medium 41.

When data is recorded on the magnetic disk medium 41 by the magnetic head 63, data is recorded on the magnetic disk medium 41 by sending a signal to the magnetic head 63 by a control circuit (not shown), and the data is recorded from the magnetic disk medium 41. In reproduction, the magnetic head 63 detects a magnetic field change on the magnetic disk medium 41 and outputs a signal.
At this time, the dust on the magnetic disk medium 41 is removed by the liner 49 appropriately touching the magnetic disk medium 41.
After the magnetic disk cartridge 1 is used, after the magnetic head 63 is retracted from the cartridge case 2, the magnetic disk cartridge 1 is ejected, whereby the gear 51 f is driven by the shutter open gear 67 and the shutter 4 closes the opening 3. .
When removed from the magnetic disk drive, the disk stack 40 is urged toward the lower plate 10 by the urging force of the compression coil spring 46, so that the disk stack 40 does not rattle within the cartridge case 2.

Since the magnetic disk cartridge 1 has the plurality of magnetic disk media 41 as described above, data can be transferred at high speed by simultaneously accessing data with the plurality of magnetic heads 63.
In addition, since the cartridge case 2 is configured by stacking the inner plates 20, it is easy to change specifications so that the number of magnetic disk media 41 is different. When the magnetic disk cartridge 1 is assembled, the magnetic disk medium 41 can be mounted and handled on the inner plate 20 or the lower rotor 51 assembled to the lower plate 10. Can be made more stable.
Since the inner plate 20 is laminated and fixed on the lower plate 10 or the inner plate 20, the parallelism with the magnetic disk medium 41 can be increased, and the rotation of the magnetic disk medium 41 can be stabilized. In addition, the magnetic disk medium 41 can be rotated at a high speed, and hence the data transfer speed can be increased.
In particular, even when the number of magnetic disk media 41 is increased, the concave portion 33 in which the bearing portion 47 is integrated can be rotated stably, so that a large capacity can be obtained without impairing the stability during rotation. The magnetic disk cartridge 1 can be obtained.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented.

  FIG. 7 shows a modification of the embodiment. FIG. 7 is an enlarged cross-sectional view of the vicinity of the connecting shaft and the recess according to the modification, where (a) is a first modification, (b) is a second modification, and (c) is an enlarged cross-sectional view showing the third modification. .

  For example, as shown in Modification 1 of FIG. 7A, the concave portion 33 and the bearing portion 47 in the embodiment may be formed in the spherical concave portion 33A and the bearing portion 47A. The radius of curvature of the recess 33 at the contact point with the distal end portion 44b is set larger than that of the distal end portion 44b. With this configuration, the tip 44b is in point contact with the bearing 47A (recess 33A), so that the frictional force generated along with the rotation of the connecting shaft 44 can be kept small, and the rotational movement of the disk stack 40 can be reduced. It can be further stabilized.

  For example, as shown in Modification 2 in FIG. 7B, the tip end portion 44b of the connecting shaft 44 in the above embodiment may be formed in a conical tip end portion 44d. If comprised in this way, since the front-end | tip part 44d carries out point contact to the bearing part 47 (recessed part 33), the effect similar to the modification 1 can be acquired.

  For example, as shown in Modification 3 of FIG. 7 (c), the bearing ball 45 having excellent slipperiness and wear resistance, which is a separate member from the shaft portion 44a, is used for the tip end portion 44b of the connecting shaft 44 in the above embodiment. You may comprise. At this time, a ball holding portion 44e for stably holding the bearing ball 45 is formed on the connecting shaft 44. According to this structure, the bearing ball 45 is disposed in the ball holding portion 44e of the connecting shaft 44, contacts the bottom surface of the ball holding portion 44e and the bearing portion 47 (recess 33), and rotates the disk stack 40. To support.

  Further, for example, in the embodiment, the concave portion 33 and the bearing portion 47 are formed in a conical shape, but may be formed in a polygonal pyramid shape. Further, the distal end portion 44b of the connecting shaft 44 may be formed in a polygonal pyramid shape as well. In any case, it is possible to make point contact between the bearing portion (concave portion) and the tip portion.

  In the above embodiment, the magnetic disk medium 41 is applied as the recording disk medium. However, the present invention can be similarly applied to an optical disk medium that records data by light.

  Moreover, in the said embodiment, although the lower plate 10, the inner plate 20, and the upper plate 30 were fastened and fixed with the screw | thread 91, it is also possible to fix integrally by adhesion | attachment and welding.

1 is an exploded perspective view of a magnetic disk cartridge according to an embodiment. FIG. 2A is a perspective view of an external appearance of a magnetic disk cartridge according to an embodiment, and FIG. 3B shows a state in which the shutter is closed, and FIG. It is a perspective view which shows the inner surface of an upper plate. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2A of the magnetic disk cartridge loaded in the magnetic disk drive. It is the elements on larger scale of FIG. It is a disassembled perspective view which shows the laminated structure of a magnetic disc medium. It is an expanded sectional view near a connecting shaft and a recessed part concerning a modification, (a) is modification 1, (b) is modification 2, (c) is an expanded sectional view showing modification 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic disk cartridge 2 Cartridge case 3 Opening part 4 Shutter 10 Lower plate 20 Inner plate 23 Notch 30 Upper plate 33,33A Concave 34 Opening 40 Disk stack 41 Magnetic disk medium 42 Center core 43 Spacer 44 Connecting shaft 44a Shaft part 44b Tip part 47 , 47A Bearing portion 49 Liner 51 Lower rotor 52 Upper rotor 61 Actuator 62 Swing arm 63 Magnetic head 65 Spindle

Claims (4)

Multiple flexible recording disc media,
A rotating body for holding these recording disk media so as to rotate integrally;
A recording disk cartridge comprising the recording disk medium and a cartridge case for accommodating the rotating body,
A support shaft that is interposed between the cartridge case and the rotating body and contacts the inner surface of the cartridge case at the tip;
An elastic member that urges the support shaft and the rotating body in directions away from each other;
A recording disk cartridge, wherein a concave portion for a bearing for positioning a tip end portion of the support shaft portion on a rotation shaft of the rotating body is formed on an inner surface of the cartridge case.   The recording disk cartridge according to claim 1, wherein the tip portion is formed in a spherical shape.   3. The recording disk cartridge according to claim 1, wherein the recess is formed in a spherical shape, a conical shape, or a polygonal pyramid shape.   4. The recording disk cartridge according to claim 1, wherein at least one of the leading end portion and the concave portion is made of a wear-resistant material. 5.

Images