JPH03205672A - Disk cartridge - Google Patents

Abstract

PURPOSE:To blow off dust from the surface of a disk by providing a mechanism for opening a part of the side of a cartridge by interlocking with loading the cartridge in a disk driving device in a cartridge main body. CONSTITUTION:When the cartridge is inserted into the driving device 12 halfway, a fitting pin 10 is elastically supported on the side of the cartridge main body 1 in virtue of a spring 11 and fitted in a fitting part at a position corresponding to the fitting part and continues to open an opening part 1c with a succeeding inserting action. When the cartridge is perfectly loaded in the device 12, an opening and closing member 4 is opened and a shutter 2 is also opened. Therefore, by rotating the disk 8 in such a state, the dust is ejected from the opening part 1c as it is even though the dust gets into the cartridge main body 1 by flowing with the current of air. Thus, the dust is prevented from adhering to the surface of the disk.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an optical disc. This relates to a disk drive cartridge that houses an information recording medium such as a magneto-optical disk and is loaded into a drive device when recording, reproducing, and/or erasing information.

(Prior Art) In recent years, as a recording medium for recording, reproducing, and/or erasing information using a light beam, a disk-shaped substrate made of glass, synthetic resin, etc., and a substrate with a thickness of 100 mm formed on this substrate are used. Magneto-optical disks formed by perpendicular magnetization films of about ~500^ are attracting attention. This perpendicularly magnetized film is composed of a thin film such as an amorphous alloy, and has the property of being magnetized in the direction perpendicular to the film surface. When recording information on a magneto-optical disk, first a perpendicular magnetic field is applied to the magneto-optical disk to align the magnetization direction of the perpendicularly magnetized film in one direction. Next, when the perpendicularly magnetized film is irradiated with a laser beam spot digitally modulated according to the information signal, the temperature of the irradiated part rises above the Curie point, and the magnetization is caused by the influence of the surrounding magnetic field acting at this time. The direction is reversed and a logical rlJ or "0" recording bit is formed. When reproducing information, first a linearly polarized laser beam is made incident on the recording bit. At this time, the polarization plane of the reflected light rotates slightly due to the magneto-optical effect, or Kerr effect, in accordance with the magnetization direction of the recording bit, so this rotation is detected as a change in the light amount via an analyzer, and information is transmitted. is read.

In this way, magneto-optical disks use laser light to record, reproduce, and/or erase information in a non-contact manner through a transparent substrate that protects a perpendicularly magnetized film, so they are generally less susceptible to dust and dirt than magnetic disks. It is said that there is little impact on

(Problem to be solved by the invention) However, the size of recording bits recorded on a disk is very small, 1 to 2 μm, and the influence of dust cannot be ignored. When recording or reproducing information, the shutter of the cartridge is opened and the disc is partially exposed, but at the same time air is pumped into the drive unit to cool the inside of the drive unit. Since the airflow carries the dust and causes it to flow in, it is unavoidable that dust will adhere to the disk surface. This affects the reproduction of information and prevents obtaining accurate information. (Object of the Invention) The present invention has been made based on the above-mentioned circumstances. When dust enters onto the disk through the shutter opening of the cartridge, airflow is actively taken into the cartridge and the dust is removed from above the disk surface. The aim was to provide a disc cartridge designed to blow away dust. (Means for Solving the Problems) Therefore, the present invention includes a cartridge main body housing an information recording medium therein, and an opening provided in the cartridge main body for exposing at least a portion of the recording medium. , a disk cartridge having a shutter that opens and closes the opening by slidingly moving with respect to the cartridge main body, the shutter moves when the cartridge is loaded into a disk drive device and closes one side of the cartridge. A mechanism for opening the cartridge body is provided in the cartridge body.

(Function) Therefore, the disk entered the cartridge while it was rotating inside the drive! ! Dust is blown away from the disk surface by the airflow flowing between the shutter opening and the side opening of the cartridge, and is not stagnated inside the cartridge. Therefore, there is no possibility of erroneous writing or reading caused by dust during recording or playback. The impact can be avoided and reliability can be improved. (Example) Hereinafter, an example of the present invention will be specifically described with reference to the drawings. In the figure, the symbol l is the cartridge body;
This accommodates a disk 8 inside, and is provided with a shutter 2 to prevent dust from entering the cartridge when not in use.

The shutter 2 opens and closes an opening 1a formed on one side of the cartridge body, and is slidable along a guide groove 1b, and is moved in the closing direction by a twisted coil spring 3. It is energized. On the other hand, in the present invention, the opening 1c is located on the side surface of the cartridge main body l.
is open, and an opening/closing member 4 is placed here. The opening/closing member 4 is slidable along a guide groove 9 formed on the side surface of the cartridge body 1 in line with the opening 1c, and is biased in the closing direction via a compression coil spring 6. ing. Further, a recessed groove-shaped fitting portion 7 is formed on the outer surface of the opening/closing member 4, and a fitting bin 1o is arranged toward the side surface of the cartridge body 1 on the corresponding drive device l2 side. and is supported by spring l1. In such a configuration, as shown in Figure 3(a),
When loading a cartridge from the loading port 12a of the drive device 12, the shutter 2 and opening/closing member 4 are
is in the closed state, but when the cartridge is inserted halfway into the drive device l2, as shown in FIG. , is fitted into the fitting part 7 at a position corresponding to the fitting part 7, and the opening part 1c is opened by the subsequent insertion operation. When the cartridge is completely loaded into the drive device, that is, as shown in Fig. 3 fcl,
The opening/closing member 4 is completely opened, while the shutter 2
is also completely open.

In the figure, reference numeral 5 is an optical head used for reading or writing information from the disk 8, and l3
is a drive device for driving this in the tracking direction.

Therefore, when the disk 8 rotates in this state, the fourth
As shown in the figure, due to the rotation of the disk 8, the opening 1
The air drawn into the cartridge main body l from a is discharged to the outside of the cartridge nozzle through the side opening 1c without being stagnated within the cartridge. For this reason, even if you are riding on an air stream! ! Dust is on the cartridge body 1
The particles 6 are discharged from the opening 1c without being attached to the surface of the disk 8, or even if they are attached, they are immediately blown away by the air flow. Therefore, disks can record and play information without being affected by dust, and maintain reliability. In the above embodiment, the opening/closing member 4 is provided as a mechanism for opening the side surface of the cartridge in conjunction with loading the cartridge into the drive device, and this is elastically supported by the compression coil spring 6. For the fitting part 7,
drive? Although the opening operation is performed by fitting the fitting bin on the tN side, for example, the opening/closing member 4 can be connected to the shutter 2.
For example, a mechanism may be constructed in which the cartridge is opened and closed by a means provided on the cartridge body. (Effects of the Invention) The present invention has been described in detail above, and when the cartridge is loaded into the drive device, the side of the cartridge is opened in addition to the shutter opening of the cartridge, and air is circulated as the disk rotates. This can prevent dust from adhering to the disk surface. Therefore, it is possible to avoid the adverse effects of dust adhesion on information recording and reproduction, and to maintain and improve reliability.

[Brief explanation of drawings]

1 is a plan view of a cartridge showing an embodiment of the present invention, 21:iA is a plan view showing a shutter and an opening device for the opening/closing member, and FIG. 3(a). (b) and (c) are plan views showing step-by-step the situation when the cartridge is loaded into the drive device, and FIG. 4 is a schematic perspective view of the whole. 1...Cartridge body

Claims (1)

[Claims] A cartridge main body housing an information recording medium therein, an opening provided in the cartridge main body for exposing at least a part of the recording medium, and the above-mentioned information storage medium by slidingly moving with respect to the cartridge main body. In a disk cartridge having a shutter for opening and closing an opening, the cartridge main body is provided with a mechanism that opens a part of a side surface of the cartridge in conjunction with loading the cartridge into a disk drive device. Featured disc cartridge