JPH02244469A - Disk cartridge - Google Patents

Abstract

PURPOSE:To prevent write and read-out errors of an information signal by providing a sliding means on a non-signal recording area of the inside circumferential side part of a disk corresponding to a disk supporting part provided projectingly on the inner wall side in the vicinity of the peripheral edge of an opening part formed in a cartridge body. CONSTITUTION:A sliding means 38 is provided on a non-signal recording area 5b of the inside circumferential side part corresponding to a disk supporting part 16 provided projectingly on the inner wall surface side in the vicinity of the peripheral edge of opening parts 7, 8 formed in a cartridge body 4 of a disk 5 contained in the cartridge body 4. Accordingly, flawing caused by a slide-contact of the cartridge body 4 and the disk 5 and generation of wear powder generated from this flawing can be prevented. In such a way, write and read-out errors of an information signal can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk cartridge that rotatably accommodates a disc-shaped disk such as an optical disk or a magneto-optical disk within a cartridge main body.

[Summary of the invention]

The present invention provides a cartridge constituting a disk cartridge rotatably housing a disc-shaped disk such as an optical disk or a magneto-optical disk, in which a cartridge is provided that protrudes from an inner wall near the periphery of an opening formed in the cartridge body. By providing a slippery means in the non-signal recording area of the inner circumferential side of the disk corresponding to the disk support part, generation of abrasion powder due to sliding contact between the disk and the cartridge body during transportation etc. is prevented. This is what I did.

[Prior Art] Conventionally, disc-shaped recording media such as optical discs and magneto-optical discs have been subjected to the following procedures to prevent dust from adhering to the disc surface or from causing scratches during storage. Furthermore, during use, the disc is rotatably housed in a disc cartridge in order to prevent fingerprints from adhering to the disc surface and to facilitate installation when the disc is installed in a disc rotation drive device.

This disk cartridge 1, as shown in FIG.
The disk 5 is housed in a cartridge body 4 formed by butting and connecting upper and lower halves 2.3. In the cartridge body 4, the disk 5 is rotatably housed in a disk storage portion 6 which has a larger diameter than the outer diameter of the disk 5 and is thicker than the disk 5. Further, on both the upper and lower surfaces of the cartridge main body 4, from the center to the front side, there are arranged inside the recording and/or reproducing device into which the disk cartridge 7 is installed. An opening 7.8 is provided through which a pickup device for writing and/or reading predetermined information signals to and from the disk table 21 of the disk rotation drive device and the disk 5 faces. The openings 7 and 8 are closed by a shank 9 that is slidably provided on the cartridge main body 4, and
is opened only when the cartridge body 4 is installed in the rotary drive device, and prevents dust etc. from entering the cartridge body 4 when not in use.
This prevents fingers from touching the disc 5, and prevents errors in writing and/or reading information signals caused by dust or finger marks adhering to the signal recording area 5a of the disc 5.

Further, as shown in FIG. 5, a center spindle 22 of a rotary drive device is engaged at the center of both main surfaces of the disk substrate 5A, which is mainly made of a synthetic resin substrate, on which the signal recording area 5a of the disk 5 is formed. A hub 11 having a central hole 10 that
are installed respectively. This hub 11 is constructed by integrally attaching a magnetically attractive metal plate 13 to one both sides of a ring member 12 made of synthetic resin.

The disk cartridge L constructed as described above has a positioning hole 1 formed on the outer surface of the cartridge body 4.
4 is engaged with a positioning pin 15 disposed within the rotary drive device, the mounting position is determined. The disk 5 in the disk cartridge 1 is the fifth disk.
It is mounted on a disc table 21 configured as shown in the figure.

This disk table 21 is connected to the hub 1 of the disk 5.
A center spindle 2 that engages with a center hole 10 provided in 1.
2 at the center, and the upper surface of the outer circumferential side of the disk support supporting the disk substrate 5A around the hub 11 of the disk 5 is a surface 23, and the metal plate 13 attached to the hub 11 is attached to the inner circumference of the disk support. A ring-shaped magnet 24 is attached to generate a uniform magnetic field around the center spindle 22 for magnetic attraction.

The disk table 21 has a smaller diameter than the non-signal recording area 5b provided on the inner circumferential side of the disk substrate 5A so that the signal recording area 5a faces the pickup device when the disk 5 is supported. .

Further, the disk cartridge 1 which rotatably accommodates the disk 5 is configured to hold the disk 5 during transportation or the like.
In order to prevent the signal recording area 5a of the disk 5 from being scratched due to sliding contact between the cartridge body 4 and the cartridge body 4, a disk support portion 16 that protrudes from the inner wall surface of the cartridge body is provided. The non-signal recording area 5b on the inner circumferential side of the disk 5 is supported on the surface of the disk 5 to prevent the signal recording area 5a of the disk 5 from coming into contact with the inner wall surface of the cartridge body 4.

[Problem that the invention seeks to solve]

By the way, in addition to using the above-mentioned disk cartridges by inserting them into a disk rotation drive device, a plurality of disk cartridges are stored in a rack, and a desired disk cartridge is taken out by a transport mechanism and transferred to the rotation drive device to record information. and/or may be used by being stored in a disc exchange device for playback. By storing and using the disk cartridge in a disk exchange device in this manner, it is possible to improve the operation of exchanging a plurality of disk cartridges, and it is particularly suitable for cases where a large amount of information storage capacity is required.

However, in the above-mentioned disk exchange apparatus, high access speed is required in order to shorten the time required to exchange disks. At this time, when the disk cartridge l is mounted on or ejected from the rotary drive device, the disk support portion 1 is formed to protrude from the inner wall surface of the cartridge main body 4 inside the disk cartridge l.
Since the upper disk 6 directly supports the inner peripheral surface side of the disk 5, the upper disk 5 and the disk support portion 16 of the cartridge main body 4 come into sliding contact.

That is, since the disk 5 is housed within the cartridge body 4 with a predetermined gap in order to freely rotate, the disk 5 is movable within the range of this gap, and the disk 5 is placed on the disk table 21. Before and after being mounted, the surface of the disc 5 accommodated by the movement of the disc cartridge 1 comes into vigorous sliding contact with the disc support portion 16 formed protrudingly from the cartridge body 4.

Here, the cartridge body that accommodates the disk is made of a synthetic resin that has good moldability and sufficient mechanical strength, such as ABS resin, while the disk has a recording layer that takes into consideration moisture absorption resistance, heat resistance, etc. The disk substrate on which is provided is made of polycarbonate resin. In this way, the materials constituting the cartridge body 4 and the materials constituting the disk base Fi5A are different, and each has its own characteristics.
In the disk cartridge l in which the disk 5 is supported by a disk support portion 16 that is made of the same material as the cartridge body 4 and integrally formed on the inner wall surface side of the cartridge body 4, the disk 5 is supported. When the disk 5 and the cartridge main body 4 come into sliding contact due to vibrations applied at times, ring-shaped scratches may be formed on the disk 5.

Moreover, conversely, the surface of the disk support portion 16 formed protrudingly from the cartridge main body 4 may be worn out.

In this case, it goes without saying that the surface of the disk 5 is flat, but the surface of the disk support portion 16 is also smooth, so the contact area is large (the disk cartridge l
Since the disk 5 is movable within a certain range, the surface of the disk 5 and the surface of the disk support 16 may be subject to significant wear due to the impact caused when replacing the disk cartridge by the above-mentioned transport mechanism. becomes.

As a result, abrasion particles are generated due to scratches on the disk and abrasion of the disk support, and this abrasion particles remain inside the cartridge body and adhere to the signal recording area of the disk, making it difficult to write or read information signals. Sometimes it causes read/write errors.

In particular, when the disk is an optical disk, this problem is remarkable, and the light beam from the optical head device cannot reach the recording layer of the disk due to attached abrasion powder, and the recording layer in the area irradiated with the light beam cannot reach the recording layer of the disk. Not only does this prevent the temperature from rising, the amount of light returned from the recording layer decreases, and the S/N ratio during playback deteriorates, but also abrasion powder adheres to the objective lens of the optical head, making playback completely impossible. It may also happen that it becomes.

In addition, since the reproduction method of magneto-optical disks, which allow information to be rewritten even on optical disks, is to detect recorded signals by minute rotations of the plane of linear deflection of the light beam, the generation of wear debris becomes a serious problem. .

As a solution to this problem, it is also possible to reduce the H vibration force generated between the surface of the disk support section and the surface of the disk by making the surface of the disk support section not a flat surface but a surface with a satin-like uneven surface. However, it is necessary to process the mold for forming the halves that make up the disk cartridge, and the surface will gradually wear out if the disk cartridge is replaced repeatedly due to the delicate unevenness of the satin finish. Therefore, the above problems cannot be solved satisfactorily.

In addition, although the above-mentioned problem is explained in the case where the inner circumferential side of the disk is supported by the disk supporting part in the above-mentioned FIG.
This becomes even more noticeable when it is received on both the inner and outer circumferential sides.

SUMMARY OF THE INVENTION Therefore, the present invention prevents damage to the disk stored in the cartridge main body or wear of the disk support part, and also prevents the generation of abrasion powder resulting from sliding contact between the cartridge main body and the disk, thereby transmitting information signals. The purpose of this proposal is to provide a disk cartridge that does not cause writing or reading errors.

A slippery means is provided in the non-signal recording area of the inner circumferential side corresponding to the disk support protruding from the inner wall surface near the periphery of the cartridge, thereby preventing scratches and damage caused by sliding contact between the cartridge body and the disk. Generation of abrasion powder caused by scratches is prevented.

C Means for Solving Problems] The present invention solves the problems of the conventional disk cartridge as described above, and in order to achieve the above object, an information signal is recorded in the cartridge body. In a disk cartridge configured to rotatably house a disk, a non-signal recording area on an inner circumferential side of the disk corresponding to a disk support protruding from an inner wall near the periphery of an opening formed in the cartridge main body. and is provided with a slippery means.

[Effect]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to an opening formed in the cartridge body of a disk housed in the cartridge body [Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Note that the same numbers will be used to describe the same members as those of the conventional disk cartridge.

As shown in FIG. 2, the disk cartridge 30 according to the present invention comprises a cartridge main body 4, which is constructed by abutting an upper half 2 and a lower half 3, each having a rectangular shape, and connecting and fixing them with a plurality of screws 31; A disk-shaped disk 5 such as an optical disk or a magneto-optical disk is rotatably housed in the main body 4, and an information signal is provided to the upper half 2 and lower half 3 of the cartridge main body 4, respectively, and sends information signals to the disk 5. The main component is a sliding shank 9 that opens and closes an opening 7.8 facing an information signal writing successive means such as an optical pickup for writing and reading written information signals.

The upper half 2 and lower half 3 constituting the cartridge main body 4 are made of synthetic resin, such as ABS resin, which has good moldability and sufficient mechanical strength. When the upper half 2 and the lower half 73 are butt-jointed together, they constitute a space sufficient to rotatably accommodate the disk 5 therein.
And on the peripheral edge of the lower half 3, there is a rising wall 32 which constitutes the peripheral side wall of the cartridge main body 4 by being butt-coupled.
．． 33 are formed on the inner wall surface, and a plurality of arc-shaped ribs 34, which constitute a position regulating wall that regulates the horizontal position of the disc 5 to be stored, and which constitute the disc storage section 6.
35 protrude in a circumferential shape slightly larger than the outer diameter of the disk 5.

Further, the opening 7.8 facing the information signal writing/reading means such as an optical pink-up is located on both the upper and lower sides of the cartridge body 4, that is, from the central part of the upper half 2 and lower half 3 to the front side on which the shutter 9 is attached. It is formed in a substantially rectangular shape along the edges, and is formed so that a portion extending from near the outer peripheral edge to the center of the disk 5 housed in the cartridge body 4 can be exposed to the outside of the cartridge body 4. There is. By forming the openings 7.8 in this manner, the information signal writing/reading means can scan the inner and outer circumferences of the disk 5, and the disk rotation device of the recording/reproducing apparatus example that rotationally drives the disk 5 is also enabled. The disk table 21 can also enter into the cartridge body 4 through these openings 7.8 to support the disk 5.

The disk 5 accommodated in the cartridge body 4 is located near the periphery of the arcuate portion 7a8a into which the disk table 21 enters the central portion of the openings 7 and 8.
At a position corresponding to the non-signal recording area 5b on the inner circumferential side of the cartridge body 4, there is a disk support portion for supporting the disk 5 housed in the cartridge body 4! 6 is formed protrudingly. This disk support portion 16 is formed in a ring shape, and is formed on the inner wall side of the upper half 2 and lower half 3 so as to surround the arcuate portions 7a and 8a of the openings 7 and 8. . This disk support portion 16 is
As shown in FIG. 1, they are formed to protrude from the inner wall surfaces of the upper half 2 and lower half 3 and have a thickness sufficient to reliably support the disk 5.

As described above, the upper half 2 is provided with a plurality of arcuate lips 34, 35 constituting the disk storage section 6 on the inner wall side and a disk support section 16 that supports the non-signal recording area 5b of the inner peripheral side of the disk 5. And the lower half 3 has screw fixing parts 36 and 3 provided at the four corners of each half 2.3 so as to store the disc 5 in the disc storage part 6.
7 are abutted against each other, and the screws 31 are screwed between these screw fixing portions 36 and 37 to connect and fix the cartridge body 4, which rotatably accommodates the disk 5, as shown in FIG.

On the other hand, the disk cartridge 1 configured as described above
The disc 5 stored in the disc 5 is provided with a recording layer for information signals on a disc substrate 5A made of polycarbonate resin, a reflective film of aluminum is formed on this recording layer, and a synthetic resin film for protection is formed on the reflective film. It is constructed as a so-called double-sided type, in which two sheets are bonded together.

As shown in FIG. 1, a center spindle 22 of a disk rotation drive device is located at the center of both main surfaces of the disk substrate 5A where the signal recording area 5a of the disk 5 is formed.
A hub 11 is mounted which has a central hole 10 into which it engages. This hub 11 includes a ring member 1 made of synthetic resin.
A metal plate 13 having magnetic adsorption properties is integrally removed from one side of the metal plate 2.

Further, the disc 5 is located near the outer peripheral edge of the hub +1, and the disc holder of the disc table 21 is located on the surface 23.
The arcuate portion of the opening 7.8 formed in the cartridge body 4 at the outer periphery of the cartridge body 4? A slippery sheet 3 is pasted as a slippery means on the non-signal recording area 5b of the inner peripheral side of the disk 5 corresponding to the disk support portion 16 protruding from the inner wall side of the disks 8a and 8a. ing. As the sheet 38 having lubricity, for example, a ring-shaped sheet 38 made of a transparent lubricity material such as polyethylene terephthalate (PET) may be used, and the sheet 38 may be attached using a transparent adhesive. Preferably, if a transparent sheet and adhesive are used in this way, the loft number of the disc 5 (manufacturing date of the disc, stamper number, etc.) provided in the part where the sheet 38 having slipperiness is pasted, etc. It is possible to make the determination possible.

In addition, especially if the part to which this sheet is pasted does not require a rod number or such number to be read, the sheet and adhesive do not need to be transparent.
Therefore, for example, the slippery sheet 38 may be a Teflon sheet, another polymer sheet, or a highly abrasion-resistant material coated or impregnated with a slippery material.

Furthermore, the above-mentioned slippery sheet does not necessarily have to be ring-shaped, and a plurality of sheet members 39 divided into predetermined sizes as shown in FIG. good.

Furthermore, the surface of the sheet 38 having lubricity does not necessarily have to be flat, and may have a wavy cross section or a partially uneven surface, which may reduce the N coefficient of friction. Bye.

In this way, the opening 7 formed in the cartridge body 4 of the disk 5 housed in the cartridge body 4.
The arc-shaped part of 8? Non-signal recording area 5 on the inner peripheral side corresponding to the disk support part 16 protruding from the inner wall side of a, 8a
By attaching a sheet 38 having slipperiness to b,
This sorting for three days prevents scratches and wear caused by sliding contact between the disk support portion 16 of the cartridge body 4 and the disk 5. Therefore, generation of abrasion powder caused by the scratches and wear is prevented, and errors in writing and reading information signals caused by adhesion of this abrasion powder to the signal recording areas f and l can be prevented.

Note that when a disk support portion is provided on the inner circumferential side of the arcuate ribs 34 and 35 for narrowing the interval between the disk storage portions 6 and supporting the outer peripheral edge of the disk 5, the disk support portion corresponds to this disk support portion. A sheet having the above-mentioned slipperiness may be attached to position 1.

In addition, in this embodiment, wear due to sliding contact between the disk and the disk supporting portion of the cartridge main body is prevented by pasting a sheet having slipperiness as the slipping means. The means is not limited to pasting a sheet; for example, a slippery material may be deposited on the predetermined position to prevent wear due to sliding contact between the disk and the disk support portion of the cartridge body.

H1 Effects of the Invention As described above, the present invention provides an inner periphery of a disk housed in a cartridge body that corresponds to a disk support portion protruding from the inner wall surface near the periphery of an opening formed in the cartridge body. Since the slippery means is provided in the non-signal recording area of the side portion, it is possible to prevent scratches due to sliding contact between the cartridge body and the disk and generation of abrasion powder resulting from the scratches. Therefore, it is possible to provide a disk cartridge that can eliminate errors in writing and reading information signals caused by the adhesion of the abrasion powder to the signal recording area.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts of a disc cartridge according to the present invention, FIG. 2 is an exploded perspective view of the disc cartridge, FIG. 3 is an external perspective view of the disc cartridge, and FIG. FIG. 7 is a perspective view showing a disk in another embodiment of the invention. FIG. 5 is a sectional view of a conventional disk cartridge. 2... Upper half 3... Lower half 4... Cartridge body 5... Disk 16... Disk support section 38... Sheet

Claims (1)

[Scope of Claims] A disk cartridge rotatably housing a disk on which information signals are recorded in the cartridge body, comprising: a disk support protruding from an inner wall near the periphery of an opening formed in the cartridge body; A disc cartridge comprising a slipping means provided in a non-signal recording area of the inner peripheral side of the disc corresponding to the area.