JPH04155680A - Disk cartridge - Google Patents

Abstract

PURPOSE:To improve chucking performance of a disklike recording medium to a turntable by forming the inner diameter of a rib larger than the diameter of a turntable insertion hole and smaller than the inner diameter of a recording area of the medium. CONSTITUTION:A disk cartridge 3 is formed at the inner diameter D of a rib 7 of substantially semicircular shape formed integrally with the inner surface 2a of a lower half 2 along the outer periphery of a turntable insertion hole 6 to be sufficiently larger than the diameter A of the hole 6, and formed at the outer diameter E of the rib 7 to be smaller than the inner diameter F of the annular recording area 4a of a hard disk 4. Thus, since the rib 7 is, when the inner periphery 4b of the disk 4 is placed on the rib 7, not engaged with the area 4a, the area 4a is not damaged by the rib 7. The inclining angle theta2 of the disk 4 in the cartridge 3 can be reduced. Accordingly, chucking performance when the disk 4 is chucked on a turntable 9, is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the use of hard disks such as magneto-optical disks.
This article concerns disc cartridges that are most suitable for use with discs.

[Summary of the Invention] The present invention provides for the inner periphery of a disk-shaped recording medium housed in a cartridge to be provided with a rib provided on the inner surface of the lower half of the cartridge along the outer periphery of a turntable insertion hole provided in the lower half of the cartridge. In the disc cartridge configured to be placed on the turntable, by forming the inner diameter of the rib to be larger than the diameter of the turntable insertion hole, the chucking performance of the disc-shaped recording medium to the turntable can be improved. This is what I did.

[Prior Art] As a conventional example of a disk cartridge using a hard disk such as a magneto-optical disk, for example,
There is a publication No. 475.

In this conventional example, as shown in FIG. 6, a cartridge 3 is constituted by upper and lower halves 1.2 molded from synthetic resin, and a hard disk 4' such as a magneto-optical disk which is a disk-shaped recording medium! It is rotatably housed in the i-cartridge 3. Then, a circular shallow dish-shaped center core 5 made of a metal plate such as stainless steel fixed to the center of the hard disk 4 is loosely fitted into a circular turntable insertion hole 6 provided approximately at the center of the lower half 2. ing. Then, a substantially semicircular rib 7 is integrally molded on the inner surface 2a of the lower half 2 along the outer periphery of the turntable insertion hole B.

When the disk cartridge is not in use, the inner periphery 4, which is inside the annular recording area 4a of the hard disk 4,
By placing the recording area 4a on the rib 7, the recording area 4a of the hard disk 4 is prevented from coming into contact with the inner surface 2a of the lower half 2 and damaging it.

When this disk cartridge is installed in a recording/reproducing device, the turntable 9 is relatively inserted into the turntable insertion hole 6 from below, as shown in FIG. spindle 10
is inserted into the center hole 5a of the center core 5, and the inner periphery 4b of the hard disk 4 is placed horizontally on the annular and horizontal disk height reference surface 11 formed on the outer periphery of the upper end of the turntable 9. Then, the disk 4 is floated midway between the upper and lower planes 1.2. So τ.

At the same time, the center core 5 is fitted into the recess 12 formed inside the disc height reference surface 11 of the turntable 9, and the magnetic attraction force of the annular magnet 13 embedded in the recess 12 So, is Center Core 5 a turntable? It is configured to be chucked on top. At the same time, the optical head 14, which is a recording and reproducing head, is relatively inserted from below into the rectangular head insertion hole 15 provided in the lower half 2, thereby recording the recording area 4a of the hard disk 4. Closed below.

Thereafter, the turntable 9 rotates the 7-inch disk 4, and the optical head 14 scans the recording area 4a in the radial direction to perform desired recording and reproduction.

[Problem to be solved by the invention]

However, in the past, since the rib 7 was formed to stand directly upward from the inner peripheral surface 6a of the turntable insertion hole B, the inner diameter A of the rib 7 was the same diameter as the diameter of the turntable insertion hole B. Its inner diameter A was very small.

Therefore, as shown in FIG. When hard disk 4
There was a problem in that the maximum inclination angle θl within the cartridge 6 became very large, making it difficult to chuck.

Further, as shown in FIG. 7, there is almost no difference between the inner diameter A of the rib 7 and the outer diameter B of the annular disc height reference surface 11 of the turntable 9, and the inner circumferential surface 7a of the rib 7 is Since it is very close to the outer peripheral surface 11a of the height reference surface 11 by about 0.5 mm, the inner peripheral surface 4a of the hard disk 4 is
The scraped powder 16 of the rib 7 generated by repeated contact with the disk was likely to be transferred onto the disk height reference surface 11.

As a result, when the center core 5 is chucked onto the turntable 9, the shavings 16 are caught between the inner circumference of the disk 4 and the disk height reference surface 11.
When the height of the hard disk 4 becomes irregular, variations occur in the gap C between the hard disk 4 and the optical head 14, resulting in errors in recording and reproduction, or the hard disk 4 comes into contact with the optical head 14. There were other problems.

The present invention can provide a disk cartridge in which the inclination of a disk-shaped recording medium within the cartridge can be made very small.

[Means for Solving the Problems] In order to achieve the above object, the disc cartridge of the present invention has the inner diameter of the rib provided on the inner surface of the lower half along the outer periphery of the turntable insertion hole. The outer diameter of the rib is smaller than the inner diameter of the annular recording area of the disk-shaped recording medium.

[For production]

In the disk cartridge configured as described above, the outer diameter of the rib is smaller than the inner diameter of the annular recording area of the disk-shaped recording medium, so when the inner circumference of the disk-shaped recording medium is placed on the rib, , the rib does not cover the recording area. However, since the inner diameter of the rib is made larger than the diameter of the turntable insertion hole, the inclination of the disk-shaped recording medium within the cartridge can be made very small. Further, a sufficient distance can be provided between the inner circumferential surface of the rib and the outer circumferential surface of the disk height reference surface of the turntable.

〔Example〕

Hereinafter, one embodiment of a disk cartridge to which the present invention is applied will be described with reference to FIGS. 1 to 5.

Note that the same structural parts as those of the conventional example shown in FIGS. 6 and 7 are given the same reference numerals, and redundant explanation will be omitted.

First, as shown in FIGS. 1 to 4, the turntable insertion hole 6 and the lead insertion hole 15 provided in the lower half 2 are connected to each other. Further, in the upper half 1, a rectangular magnet insertion hole 18 is formed directly above the head insertion hole 15 and facing n. And upper and lower half 1. ′
2 are connected from above and below with screws 19 to form a cartridge 3. A hard disk 4 is rotatably housed in the cartridge 6, and a center core 5 of the hard disk 4 is inserted freely into the turntable insertion hole 6. It is fitted. Along one end edge 6a of the cartridge 6, the upper and lower halves 1.
A slider 21 is fitted between a pair of upper and lower slide grooves 20 formed between the slide grooves 20 so as to be slidable in the direction of arrow 8]a. A U-shaped shutter 22 made of a thin plate of metal such as stainless steel is fixed to the slider 21 by a plurality of screws 23, and the longer lower side 22a and the shorter upper side 22b of the slider 22 are arranged vertically. Half 1.
It is superimposed on the outer surface of 2. By sliding the shutter 22 in the direction of arrow a using the slider 21, the head insertion hole 15 is opened and closed with the lower side 22a, and the magnet insertion hole 18 is opened and closed with the upper side 22b. In addition, in the car) IJ edge 6, insert the shutter 22 into both insertion holes 1.
Torsion spring 24 that urges the lid to slide to the closed position of 5 and 18
is incorporated. Furthermore, a guide rail 25 that slides and guides the tip 22a' of the lower side 22a of the shutter 22 is fixed to the outer surface of the lower half 2 by adhesive or the like.

Next, in this disc cartridge, the inner diameter of a substantially semicircular rib 7 integrally molded with synthetic resin on the inner surface 2a of the lower half 2 along the outer periphery of the turntable insertion hole 6 is adjusted to the diameter of the turntable insertion hole 6. A, and the outer diameter E of the rib 7 is smaller than the inner diameter F of the annular recording area 4a of the disk 4.

Therefore, according to this disc cartridge.

Since the outer diameter E of the rib 7 is smaller than the inner diameter F of the recording area 4a of the hard disk 4, when the inner circumference 4b of the hard disk 4 is placed on the rib 7, as shown in FIG. Since the ribs 7 do not cover the recording area 4a, the recording area 4a is not damaged by the ribs 7. However, since the inner diameter Di of the rib 7 is formed to be sufficiently thicker than the diameter A of the turntable insertion hole 6, the cartridge 6
The tilt angle θ2 of the hard disk 4 can be made very small.

Therefore, it is possible to improve the chucking performance when chucking the hard disk 4 onto the turntable 9 by 5vc as shown in FIG.

Moreover, by forming the inner diameter of the rib 7 to be sufficiently larger than the diameter A of the turntable insertion hole 6, as shown in FIG. A sufficient distance (5 mm or more) G can be provided between the outer circumferential surface 11a and the outer circumferential surface 11a of 11.

Therefore, the inner circumference 4 b i IJ block 7 of the hard disk 4
The height of the disc 4 of the turntable 9 can be prevented as much as possible from being caused by shavings 16 shown in FIG. 6, which are generated by repeated contact with the disc 4. This results in
Gap C between hard disk 4 and optical head 14
can be set with high precision at all times, and problems such as errors in recording and reproduction due to variations in the gap C and contact of the node disk 4 with the optical head 14 can be prevented.

Next, FIG. 5 shows a modification in which the rib 7 is formed by a plurality of protrusions 7b arranged in a substantially semicircular shape.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various effective modifications can be made based on the technical integrity of the present invention.

Further, the present invention is applicable to various disk cartridges that use various disk-shaped recording media other than magneto-optical disks.

〔Effect of the invention〕

Since the present invention is configured as described above.

This produces the following effects.

The inner diameter of the rib provided on the inner surface of the lower nof along the outer periphery of the turntable insertion hole is larger than the diameter of the turntable insertion hole as long as it does not cover the ring-shaped recording area of the disk-shaped recording medium. Since the inclination of the disc-shaped recording medium within the cartridge can be made very small by forming the disc-shaped recording medium, the chucking performance of the disc-shaped recording medium with respect to the turntable can be improved.

Since we have created a sufficient space between the inner circumferential surface of the rib and the outer circumferential surface of the turntable's disk height reference surface, the inner circumferential surface of the disk-shaped recording medium can be repeatedly brought into contact with the rib. We do our best to prevent scraped powder from the ribs from being transferred to the disc height surface of the turntable, causing the height of the disc-shaped recording medium to be chucked onto the disc height surface to be distorted. It can be prevented. The gap between the disc-shaped recording medium and the recording/reproducing head can always be set with high precision, and there are no inconveniences such as recording or reproduction errors or contact between the disc-shaped recording medium and the head due to variations in this gap. can be prevented.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, in which FIGS. 1 and 2 are cross-sectional side views of the main parts, FIG. 3 is an exploded perspective view of the whole, and FIG. 7 is a plan view of the lower part, and FIG. 5 is a perspective view showing a modified example. 6 and 7 are cross-sectional side views showing a conventional example. In addition, in the symbols used in the drawings. 1......Top half 2...Bottom half 2a...Bottom--] inner surface 3...
...Cartridge 4...Hard disk (disk-shaped recording medium) 4a...Hard disk recording area 4b.
・・・・・・Inner circumference of hard disk 6・・・・・・
...Turntable insertion hole 7...Riff. 9・・・・・・・・・Turntable 11・・・・・・
・・・Disk height reference plane A・・・・・・・・・Diameter of turntable insertion hole D・・・・・・・・・Inner diameter of rib E・・・・・・・・・・・・The outer diameter F of the rib is the inner diameter of the recording area.

Claims (1)

[Claims] A disk-shaped recording medium is rotatably housed in a cartridge consisting of upper and lower halves, and a rib is provided on the inner surface of the lower half along the outer periphery of a turntable insertion hole provided in the lower half, and a rib is provided on the inner surface of the lower half to accommodate the disk-shaped recording medium. In a disk cartridge configured such that an inner circumference is placed on the rib, the inner diameter of the rib is formed to be larger than the diameter of the turntable insertion hole, and the outer diameter of the rib is formed to be larger than the diameter of the annular shape of the disk-shaped recording medium. A disk cartridge characterized in that the inner diameter of the recording area is smaller than the inner diameter of the recording area.