JPS61142583A - Disk cartridge for information recording - Google Patents

Abstract

PURPOSE:To thin the whole thickness of a disk cartridge while securing the protection of an information recording surface by exposing the back of the disk as a protecting surface. CONSTITUTION:A case 2 covers only the information recording surface 11 side and the protecting surface 12 is exposed. A recessed part is formed on the inside of the case 2 so that the case 2 does not directly contact the information recording surface 11. Consequently, the case 2 plate is set only on one side and the space in the case 2 can be also reduced sharply, so that the whole thickness can be reduced fairly thin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information recording disk cartridge, and more particularly to an information recording disk cartridge comprising an information recording disk and a case for protecting the same.

In general, for convenience in handling, disks for recording information are often housed in a case and used in the form of an integrated disk cartridge, as shown in Figure 6. An information recording disk 1, which shows a general cross section of an optical disk or magnetic disk cartridge in use, is housed in a case 2, and supports members 3 and 4.
Supported by The case 2 is provided with a window 5, through which a hood 6 enters and exits the recording/reproducing area.
Information is written to disk 1 or information is read from disk l.

If the disc l is placed in the case 2 and used as a disc cartridge in this way, dirt will not adhere to the information recording surface where high-density information is recorded.
There will be no scratches and reliable information recording will be guaranteed.

However, conventional disk cartridges have the disadvantage that their total thickness is quite large. As shown in FIG. 6, in the conventional disk cartridge, both sides of a disk 1 are covered with a case 2, and a space is provided within the case 2 by support members 3 and 4. Therefore, the overall thickness of the disc cartridge is considerably thicker than the thickness of the disc itself. This thick total thickness requires a large amount of space in the information recording/reproducing device, and also requires a large number of discs. It also requires a lot of space to store disc cartridges.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an information recording disk cartridge that can sufficiently protect the information recording surface and reduce the total thickness.

A feature of the present invention is that in a disc cartridge for recording information, only the information recording side of the disc is covered with a case, and the other side of the disc is left exposed to serve as a protective surface. 0 on the record side! The key point is that the overall thickness is reduced while ensuring protection.

1-Part 1-1 The present invention will be described below based on illustrative embodiments. FIG. 3 is a sectional view of an information recording disk cartridge according to an embodiment of the present invention. One surface of the information recording disc 1 is an information recording surface 11, and the other surface is a protective surface 12. The case 2 is provided so as to cover only the information recording surface 11 side, and the protective surface 12 is exposed. A recess is formed inside the case 2, and the structure is such that the information recording surface 11 cannot be directly touched. With this structure, the case 2 only needs one plate, and the space inside the case 2 can also be significantly reduced, allowing the total thickness to be made considerably thinner. The information recording surface 11 is sandwiched between the case 2 and the protective surface 12 and is sufficiently protected, so no problem will occur.

FIG. 2 shows this disc cartridge inserted into an information recording/reproducing apparatus. The disc 1 is held by a spindle 7 and rotated while floating above the case 2. As shown in FIG. As another embodiment in which the recording/reproducing handle moves with respect to the information recording surface 11 of the disc l through the window 5 to record and reproduce information, the case 2 may be provided with no window as shown in FIG. In this case, disk 1
Recording and reproduction may be performed by raising the disk 1 by a distance t with the spindle 7 so that there is a sufficiently large space between the disk 1 and the case 2 for recording and reproduction.

In order to use the disc 1 floating above the case 2 during recording and playback, the disc l must be removably supported by the case 2. Therefore, the case 2 must have a pawl that supports the disc l in a removable manner. FIG. 4 is a top view of one embodiment of a disk cartridge incorporating this pawl, which is preferably provided. In this example case 2
Pawls 8 are provided at four locations to support the disk l.

In the embodiment, there are four pawls, but two or three pawls may be provided. FIG. 5 is a sectional view for explaining the peripheral edge of the disk 1 and the condition of the pawls in more detail.

A tapered portion 13 is provided at the peripheral edge of the disk 1 as shown in the figure, and the supporting member 81 of the pawl 8 supports this tapered portion 13. The support member 81 is structured to freely slide in the direction of the arrow in the figure, but is normally fixed at a position supporting the tapered portion 13 by a spring 82. Therefore, during handling of the disk cartridge, the disk 1 is integrated with the case 2. When this is set in the recording/reproducing device, the support member 81 is pressed by the push pin 9.
is pushed in the vertical direction in the figure, and is moved horizontally in the direction of the spring by the action of the cam. - Therefore, the support member 81 no longer supports the tapered portion 13.

The push pin 9 not only releases the support of the pawl 8, but also simultaneously pushes down the case 2. Therefore, by the action of the push pin 9, the disc 1 is released from the case 2, and the case 2 is pushed down. As a result, the disk 1 is lifted from the case 2 as shown in FIG.

A disk cartridge having the structure of this example was used for a magneto-optical disk. PMM as a disk substrate
A was used, and polycarbonate was used as the protective surface.

The inclination angle of the tapered portion was 45°, the case was made of aluminum, and during recording, an auxiliary magnetic field was applied with a permanent magnet from the protective surface side. As a result, good recording and reproduction could be performed.

As described above, according to the present invention, in a disc cartridge for recording information, the back surface of the disc is exposed as a protective surface, so that the total thickness can be reduced while ensuring protection of the information recording surface. be able to.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of a disk cartridge according to the present invention, FIG. 2 is a sectional view showing the state of the embodiment shown in FIG. 1 during recording and reproduction, and FIG. 3 is a recording of another embodiment. 4 is a top view of an embodiment using a disk cartridge pawl according to the present invention; FIG. 5 is a detailed view of the pawl portion of the embodiment shown in FIG. 4. 6 is a cross-sectional view of an example of a conventional disk cartridge. 1...Information recording disc 11...Information recording surface 12...Protective surface 13...Tapered portion 2...Case 3.4 ... Support member 5 ... Window 6 ... Recording/reproduction head 7 ... Spindle 8 ... Pawl 81 ... Support member 82... Spring 9... Push pin

Claims (6)

[Claims] (1) A disk having an information recording surface on one side and a protective surface on the other side, and a case supporting the disk so as to cover the information recording surface and expose the protective surface. An information recording disc cartridge characterized by: (2) The information recording disc cartridge according to claim 1, wherein the case has a claw for detachably supporting the disc. (3) An information recording device according to claim 2, characterized in that a tapered portion is provided at the peripheral edge of the disk, and the pawl supports the disk in a detachable manner by holding or releasing the tapered portion. disc cartridge. (4) The information recording disk cartridge according to any one of claims 1 to 3, wherein the case has a window through which a recording/reproducing head enters and exits. (5) The information recording disk cartridge according to any one of claims 1 to 4, wherein the disk is disc-shaped and the case is square-shaped. (6) The information recording disc cartridge according to any one of claims 1 to 5, wherein the disc is made of an optical information recording medium.