Disc cartridge

专利摘要:
The present invention relates to a disc cartridge. Disc disk of the present invention comprises a container for protecting the disk for recording / reproducing a large amount of information, air inlet means formed on its upper and lower sides facing the outer peripheral side of the disk, and air discharge means formed on its side do.
公开号:KR19990038755A
申请号:KR1019970058599
申请日:1997-11-06
公开日:1999-06-05
发明作者:김수경
申请人:구자홍；엘지전자 주식회사；
IPC主号:

专利说明:

Disc cartridge
TECHNICAL FIELD The present invention relates to a disc cartridge, and more particularly, to a disc cartridge which minimizes vibration caused by high speed rotation of a disc.
Recently, as the optical disk capable of recording / reproducing, digital versatile disks (hereinafter referred to as "DVD-RAM"), magneto optical disks (hereinafter referred to as "MOD"), and the like, have become popular. Such recording / recycling discs require a protective cartridge to prevent contamination and damage of the information recording surface by an external pollution source.
On the other hand, the current disk is required to increase the capacity, as an example of the commercially available magneto-optical disk has a 120mm outer diameter, such as the size of a compact disk (CD), the center portion has a thickness of 1.2mm The part has a thickness of 0.6 mm. Also, about 6 GB of information can be recorded / reproduced at present. In the magneto-optical recording method, a recording method using magnetic field modulation is adopted by using a magnetic head during recording, and a method of detecting a change in polarization angle according to the optical-magnetic conversion characteristic by using a photoelectric element during reproduction. Adopted. In the process of recording the information, following the process of heating the magneto-optical material applied to the MOD surface to the Curie temperature at which the magnet is lost, the magnetic head records the information by magnetizing the information recording surface of the MOD.
On the other hand, in the case of a large capacity recording medium, the influence of the vibration frequency according to the rotational speed of the disk has a large effect.
1, a disc cartridge according to the prior art will be described.
1, there is shown a disc cartridge according to the prior art which has a disc 2 for reproducing / recording a large amount of information and a cartridge 4 for protecting the disc. The disc 2 can record / reproduce a large amount of information. When the disc 2 is damaged, an error occurs in the information recording, and an error in the recording affects the information as it is. Since it will adversely affect, the cartridge 4 is mounted to protect the disk 2.
Meanwhile, referring to FIG. 1B, the spiral air flow will be described in detail. When the disc 2 rotates, the central axis of the disc has a linear velocity of "0", so that air in the vicinity flows to the surface of the disc 2. Will come down. This air flow flows outward from the disc central axis. At this time, the air particles have a speed in the direction of rotation of the disk due to friction with the surface of the disk and bend in the direction of rotation, resulting in a spiral air flow 20, and an air flow 22 at the edge of the disk. It is done.
In addition, the formation of the vortex in detail with reference to Fig. 1C, the inflow of air from the outside is made up and down the disk (2). Some of the air introduced into the cartridge 4 moves to the outer circumferential side of the disk 2 and the rest is discharged to the outside again. At this time, the air introduced into the outer circumferential side of the disk 2 from the upper side collides with the flow of air introduced from the lower side to have a flow of air rotating in a constant direction on the outer circumferential side of the disk 2, which is called a vortex. do. On the other hand, the spiral air flow and vortex formed inside the disc cartridge 4 cause vibration in the disc 2 during the high speed rotation of the disc 2, thereby causing deformation of the disc 2 outer peripheral side to Since data is recorded at an incorrect position during recording and correct data cannot be reproduced even when information is reproduced, this adversely affects recording / reproducing information on the disc 2.
As described above, the disc cartridge according to the related art has a problem in that recording / reproducing of information becomes difficult by increasing the amplitude of the disc vibration by air flow inside the cartridge as the disc rotates.
Accordingly, an object of the present invention is to provide a disc cartridge which minimizes vibration caused by high speed rotation of the disc.
1 is a perspective view of a disc cartridge according to the prior art.
1B shows air flow at the disk surface.
1C illustrates air flow inside a disc cartridge.
2A is a perspective view of a disc cartridge according to the present invention.
2B is a cross-sectional view of air flow in the disc cartridge according to the present invention.
FIG. 2C is a view showing air flow in the outer peripheral portion of the disk of FIG. 2B; FIG.
Fig. 2D is a view showing a state in which a disc outer peripheral portion is deformed.
<Description of Symbols for Main Parts of Drawings>
2, 12: disk 4, 14: cartridge
16: air outlet 18: air inlet
20: spiral airflow 22: edge airflow
In order to achieve the above object, the disc cartridge of the present invention includes a container for protecting a disc for recording / reproducing a large amount of information, air inflow means formed on its upper and lower sides facing the outer peripheral side of the disc, and its side surface. It is provided with an air discharge means formed in.
Other objects and features of the present invention other than the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.
2A and 2D, a preferred embodiment of the present invention will be described.
Referring to Fig. 2A, a disk 12 for recording / reproducing a large amount of information, air inlet means 18 formed on its upper and lower sides facing the outer peripheral side of the disk, and air discharge means formed on its side A perspective view of a disc cartridge 14 according to the invention with a 16 is shown. Looking at the flow of air formed in the cartridge by rotating the disk 12, the air introduced from the air inlet means 18 formed on the upper and lower surfaces of the cartridge to face the outer peripheral side of the disk to the rotational speed of the disk In proportion, in particular, the disk has the fastest linear velocity of air on the outer circumferential side, so that the flow of air to the side of the cartridge is faster. On the other hand, the air discharge means 16 discharges the flow of air introduced from the air inlet means 18 to the outside in the shortest distance. To this end, the air discharge means 16 is formed in the center of the side of the cartridge so that the air flowing from the upper and lower surfaces in a balanced manner. The flow of air at this time is shown in Figure 2B. On the other hand, when looking at the air flow on the outer peripheral side of the disk, the air 24 flowing from the air inlet means 18 formed on the upper and lower sides is introduced evenly into the upper and lower sides, so the distribution of air pressure on the surface of the disk is the same. do. At this time, the distribution of air pressures P and P 'acting in a direction perpendicular to the disk surface according to the flow of the inlet air 24a and 24d is shown in FIG. 2C. On the other hand, when the disk is vibrated at high speed, the distribution of air pressure on the disk surface is changed by this. In detail, when the disc has a displacement of Δh as shown in FIG. 2D due to vibration, the air passage of the upper air inlet means 18 is narrowed. In the narrowed air passage, the air flow rate is narrowed. As it increases, the air pressure increases. On the other hand, the air passage of the lower air inlet means 18 becomes wider, and in the widened air passage, the air flow rate decreases, thereby reducing the air pressure. This causes the upper mean air pressure P to be greater than the lower mean air pressure P 'so that the force F acting on the upper part becomes larger than the force F' acting on the lower part, so that the disk 12 is Is restored to the state.
2A and 2D described above, when vibration occurs in the disk, the distribution of air pressure flowing from the air inlet means 18 formed on the upper and lower surfaces of the cartridge is changed, and the disk is restored to the state before deformation. A force is applied to the surface of the disk. This can minimize the effects of vibration.
As described above, the disc cartridge of the present invention has an advantage of forming an air inlet means on its upper and lower sides facing the outer circumferential side of the disc and minimizing vibration by forming an air discharge means on its side.
Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

权利要求:
Claims (5)
[1" claim-type="Currently amended] Container to protect disk to record / reproduce large capacity of information,
Air inlet means formed at a position opposite to the outer circumferential side of the disk;
Disc cartridge characterized in that it is provided with air discharge means formed on its side.
[2" claim-type="Currently amended] The method of claim 1,
The disc cartridge, characterized in that the air inlet means is formed on at least one of the upper and lower surfaces of the cartridge.
[3" claim-type="Currently amended] The method of claim 1,
The disc cartridge, characterized in that the air inlet means is formed in an annular shape.
[4" claim-type="Currently amended] The method of claim 1,
And at least two air inlet means are symmetrically formed.
[5" claim-type="Currently amended] The method of claim 1,
And the air discharge means is formed at the center of the side of the cartridge.

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同族专利:

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公开号 | 公开日

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
1997-11-06|Application filed by 구자홍, 엘지전자 주식회사

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1997-11-06|Priority to KR1019970058599A

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1999-06-05|Publication of KR19990038755A

优先权:

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申请号 | 申请日 | 专利标题

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KR1019970058599A|KR19990038755A|1997-11-06|1997-11-06|Disc cartridge|