JPH10312662A - Disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to load a disk cartridge on a lower rank interchanger driving device which records and reproduces a disk cartridge of a lower rank storage capacity and has a chucking pin, by forming a chucking pin escape part on a center core bottom plate of the disk cartridge. SOLUTION: When a disk cartridge 1 is inserted up to a predetermined position of a cartridge holder, inner/outer peripheral parts of a bottom part 3c of a center core 3 (inside/outside of a chucking pin escape part 3f) are attracted on a spindle 202 by a magnet and the cartridge is held. When the cartridge holder descends, the chucking pin 204 is guided in the chucking pin escape part 3f provided on a bottom face of a center core 3, and a contact of this chucking pin 204 with the bottom plate 3c of the center core 3 is avoided, therefore, the center core 3 vertically descends without being tilted and the spindle shaft 203 is smoothly guided into a spindle shaft insertion hole 3d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge in which a center core is attached to a central portion of a disk as a recording medium, and the center core is magnetically chucked on a spindle of a drive device for recording and reproducing. It is.

[0002]

2. Description of the Related Art For example, a 3.5-inch micro floppy disk is known as a disk cartridge. FIG. 6 is a sectional view of a main part of the disk cartridge 1. The disk cartridge 1 has a disk 2 as a recording medium and a magnetic metal center core 3 attached to the center of the disk 2.
The recording and reproduction are performed by magnetic chucking. The disk 2 is rotatably accommodated in a shell 4, and the center core 3 faces a spindle opening 4 d provided in the shell 4.

The center core 3 has an annular flange 3a for supporting the center of the disk 1 and a bottomed cylindrical portion 3b connected to the inner periphery of the flange 3a. A spindle shaft insertion hole 3d is formed at the center of the bottom plate 3c of the bottomed cylindrical portion 3b, and a chucking pin engagement hole 3e is formed outside the spindle shaft insertion hole 3d.

Then, as shown in FIGS. 7 and 8, when the disk cartridge 1 is lowered toward the spindle 102 of the drive device 101, the center core 3
Is attracted by a magnet provided in the spindle 102, the tip of the spindle shaft 103 of the drive device 101 is introduced into the spindle shaft insertion hole 3 d of the center core 3, and the center of the Chucking pin engaging hole 3e of core 3
Then, the chucking pin 104 of the drive device 101 is engaged, and the center core 3 is chucked while being positioned on the spindle 102.

[0005]

With the recent trend toward multimedia, image and audio data to be handled has become diversified and enormous, and a disk cartridge with an increased storage capacity has been demanded. ing.

Therefore, a so-called recording density disk cartridge has been developed in which the storage capacity is increased by increasing the recording density by rotating the disk at a speed several times or several tens times the conventional rotational speed.

In the above-described disk cartridge of high recording density, it is needless to say that the centering accuracy of the disk at the time of chucking is required more than ever.

In order to improve the accuracy of positioning the center of the disc during chucking, the diameter of the spindle shaft insertion hole 3d is reduced to approach the diameter of the spindle shaft 103, and the clearance between the two is reduced. It is good, but as described above, the bottom plate 3 of the center core 3
In the disk cartridge 1 provided with the spindle shaft insertion hole 3d and the chucking pin engagement hole 3e in the disk cartridge c, if the clearance between the spindle shaft insertion hole 3d and the spindle shaft 103 is reduced, the chucking operation shown in FIGS.
When the tip of the chucking pin 104 hits the bottom plate 3c of the center core 3 and the center core 3 is slightly tilted, the spindle shaft 103 and the spindle shaft insertion hole 3d are engaged with each other as shown in FIG. The shaft 103 cannot be inserted into the spindle shaft insertion hole 3d.

For this purpose, the spindle shaft insertion hole 3d
In addition, there is a problem that it is difficult to make the clearance of the spindle shaft 103 smaller than ever.

According to the present invention, instead of providing a chucking engagement hole in the bottom plate of the center core, a chucking pin escape portion is formed, and the chucking pin always enters the chucking pin escape portion during chucking, and Even if the clearance between the spindle shaft insertion hole and the spindle shaft is reduced by preventing the center core from tilting by avoiding the chucking pin from contacting the bottom plate of the Thus, it is possible to improve the accuracy of positioning the center of the disk by smoothly inserting the disk. Further, in the present invention, by providing a chucking pin escape portion on the bottom plate of the center core, it is possible to chuck a so-called backward compatible drive device having a chucking pin.

[0011]

According to the present invention, there is provided a disk as a recording medium, and a center core attached to a central portion of a guy disk, wherein the center core has a flange portion for supporting the central portion of the disk. And a bottomed tubular portion provided on the inner peripheral side of the flange portion, and a spindle shaft insertion hole formed at the center of the bottom plate of the bottomed tubular portion. By providing a chucking pin escape portion on the bottom plate to avoid interference with the chucking pin of the drive device, the chucking pin provided on the spindle contacts the bottom plate of the center core when chucking the spindle of the drive device. Contact and prevent the center core from tilting,
Easier insertion of spindle shaft into spindle shaft insertion hole. In addition, it is possible to chuck not only a drive device having no chucking pin but also a backward compatible drive device having a chucking pin.

[0012]

FIG. 1 is a sectional view of a main part of a disk cartridge 1 according to a first embodiment. The disk cartridge 1 includes a disk 2 as a recording medium,
A center core 3 made of a magnetic metal is attached to the center of the disk 2 and a shell 4 rotatably accommodates the disk 2 to which the center core 3 is attached.

The disk cartridge 1 is adapted to be used in a compatible drive device 201 capable of recording and reproducing a plurality of types of disk cartridges having different storage capacities.

The drive device 201 comprises a spindle 202 for magnetically chucking the center core 3 of the disk cartridge 1, a spindle shaft 203,
And a chucking pin 204.

The center core 3 includes a flange portion 3a for supporting a central portion of the disk 2, and a flange portion 3a.
And a bottomed cylindrical portion 3b continuously provided on the inner peripheral side of
At the center of the bottom plate 3c of the bottomed cylindrical portion 3b, there is formed a spindle shaft insertion hole 3d into which the tip of the spindle shaft 203 of the drive device 201 is inserted, and the outer periphery of the spindle shaft insertion hole 3d. The chucking pin 204 of the drive device 201 is introduced, and a chucking pin escape portion 3f that avoids interference (contact) of the pin 204 with the bottom plate 3c of the center core 3 is formed.

The spindle shaft insertion hole 3d is formed in a circular shape having a diameter substantially the same as the diameter of the spindle shaft 203 of the drive device 201 (small diameter in units of tens to hundreds of microns). It can be inserted without causing so-called rattling.

The chucking pin escape portion 3f
Is formed by providing an annular concave portion (concave portion) on the bottom surface of the center core 3 with the spindle shaft insertion hole 3d as a center. When chucking, the chucking pin 204 and the bottom plate of the center core 3 are formed. 3c is prevented. FIG. 3 is an exploded perspective view of the disk cartridge 1. Disk 2 above
Is formed of a magnetic sheet and has a center core mounting hole 2a at the center. The center core 3 is attached to the center of the disk 2 by inserting the bottomed cylindrical portion 3b into the core mounting hole 2a and bonding the flange 3a to the upper surface of the disk 2. The shell 4 is formed in a flat casing shape by welding upper and lower halves 4a and 4b made of plastic. Liners 5 and 6 are attached to the inner surfaces of the upper and lower halves 4a and 4b, and the upper and lower surfaces of the disk 2 are sandwiched between the liners 5 and 6.

The upper and lower halves 4a, 4b are provided with recording and reproducing (head insertion) openings 4c, 4c, respectively.
It is designed to be opened and closed. The shutter 7 is
The shutter spring 8 urges the openings 4c, 4c in a direction to close the openings. At the center of the inner surface of the upper half 4a, the spindle shaft 20 of the drive device 201 is provided.
There is provided a center plate 9 with which the front end of the third plate 3 contacts. In the center of the lower half 4b, there is formed a spindle opening 4d facing the bottom plate 3c of the center core 3, and an erroneous erasure prevention member 10 is slidably mounted.

Next, the operation will be described. The disk cartridge 1 is inserted into a cartridge holder (not shown) of the drive device 201. When the disc cartridge 1 is inserted to a predetermined position of the cartridge holder (a position where the spindle shaft insertion hole 3d of the center core 3 comes directly above the spindle shaft 203 of the drive device 201), the cartridge holder is lowered. As shown in FIG. 2, the inner and outer peripheral portions of the bottom plate 3c of the center core 3 (the chucking pin escape portions 3
f inside and outside) are attracted and supported on the spindle 202 by a magnet (not shown).

When the cartridge holder descends, the chucking pin 204 is introduced into the chucking pin escape portion 3f provided on the bottom surface of the center core 3, and the chucking pin 204 and the bottom plate 3c of the center core 3 are connected. Since contact is avoided, the center core 3
Is vertically lowered without inclination, and the spindle shaft 203 is smoothly introduced into the spindle shaft insertion hole 3d.

FIG. 4 shows a disk cartridge 1 according to a second embodiment. In this embodiment, the shape of the center core 3 is changed. Center core 3 above
Is composed of a flange portion 3a for supporting the disk 2, and a bottomed cylindrical portion 3b continuously provided on the inner peripheral side of the flange portion 3a. A spindle shaft insertion hole 3d is formed at the center of the bottomed cylindrical portion 3b. Is provided.

The radius R of the bottomed cylindrical portion 3b is set smaller than the distance D from the center of the spindle shaft 203 of the drive device 201 to the chucking pin 204, and the center core 3 is chucked on the spindle 202. In the king state, the chucking pin 204 is located on the outer periphery of the bottomed cylindrical portion 3b.
That is, the diameter of the bottomed cylindrical portion 3b is formed to be smaller than that of the first embodiment, and the width W of the flange portion 3a is increased by that much.

Therefore, when a metal plate is formed by press working, the distance from the bottomed cylindrical portion 3b as a bent portion to the outermost disk mounting portion 3g of the flange portion 3a is determined in the first embodiment. In this case, it is possible to prevent a distortion or the like generated when the bottomed cylindrical portion 3b is pressed from adversely affecting the outermost disk mounting portion 3g of the flange portion 3a. The configuration of other parts is
Since the configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 5 shows a disk cartridge 1 according to the third embodiment. In this embodiment, a case is shown in which the diameter of the bottomed cylindrical portion 3b is reduced, and the width W of the flange portion 3a is reduced to reduce the diameter as in the case of the second embodiment. Thereby, the diameter of the hub mounting hole 2a on the disk 2 side can be reduced. The configuration of the other parts is the same as that of the first and second embodiments, and therefore, the same components are denoted by the same reference numerals, and redundant description is omitted.

[0025]

The disk cartridge of the present invention has the following effects.

(1) In the disk cartridge according to the first aspect, when the chucking to the drive device is performed, the tip of the chucking pin abuts against the bottom plate of the center core to prevent the center core from inclining. The difference in diameter between the insertion hole and the spindle shaft can be reduced, and the accuracy of positioning the chucking center can be improved.

(2) The disk cartridge according to the second aspect of the present invention can perform recording and reproduction with a dedicated drive device, and can also use a chucking pin for the existing low storage capacity (lower capacity) disk. The present invention can also be used for a so-called backward compatible drive device that can perform recording and reproduction.

(3) In the disk cartridge according to the third aspect, since the chucking pin escape portion is formed by providing a ring-shaped recess around the spindle shaft insertion hole in the bottom plate of the center core, the chucking pin escape portion is provided. As a result, the center of gravity of the center core can be prevented from tilting, and the rotation of the disc can be stabilized.

(4) In the disk cartridge of the fourth aspect, since the width of the flange portion of the center core is widened, when the center core is press-formed, distortion of the bent portion or the like is caused by the disk at the outermost periphery of the flange portion. It is possible to prevent the mounting portion from being adversely affected.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part according to a first embodiment.

FIG. 2 is a sectional view of a main part of the first embodiment.

FIG. 3 is an exploded perspective view.

FIG. 4 is a sectional view of a main part of the second embodiment.

FIG. 5 is a sectional view of a main part according to a third embodiment;

FIG. 6 is a sectional view of a main part of a conventional example.

FIG. 7 is a sectional view of a main part of a conventional example.

FIG. 8 is a plan view of a main part of a conventional example.

FIG. 9 is a sectional view showing a problem.

FIG. 10 is a plan view showing a problem.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk cartridge, 2 ... Disk, 3 ... Center core, 3a ... Flange part, 3b ... Bottom cylindrical part, 3c ...
Bottom plate, 3d: spindle shaft insertion hole, 3f: chucking pin escape portion, 201: drive device, 202: spindle, 203: spindle shaft, 204: chucking pin.

Claims (4)

[Claims] 1. A disk as a recording medium, comprising: a center core attached to a center portion of the disk; wherein the center core has a flange portion supporting a center portion of the disk, and an inner periphery of the flange portion. A disk cartridge comprising a bottomed cylindrical portion provided on the side of the disc and a spindle shaft insertion hole provided at a center portion of a bottom plate of the bottomed cylindrical portion, wherein the center core is a chucking pin of a drive device. A disc cartridge having a chucking pin escape portion for avoiding interference with the disc cartridge. 2. A disk as a recording medium, and a center core attached to a center of the disk, wherein the center core has a flange supporting a center of the disk, and an inner periphery of the flange. Drive device having a bottomed cylindrical portion provided on the side thereof and a spindle shaft insertion hole provided at the center of the bottom plate of the bottomed cylindrical portion, to which a disk cartridge having a different storage capacity is mounted. Wherein the center core has a chucking pin escape portion for avoiding interference with a chucking pin of a drive device. 3. The disc cartridge according to claim 2, wherein the chucking pin escape portion is formed by providing a ring-shaped recess around the spindle shaft insertion hole in the bottom plate of the center core. 4. The chucking pin escape portion according to claim 2, wherein the chucking pin relief portion is formed on the outer periphery of the bottomed cylindrical portion by reducing the diameter of the bottomed cylindrical portion, and the flange portion is formed of a bottomed cylindrical portion. A disk cartridge characterized by being formed so as to be as wide as possible with a reduced diameter.