KR19990075398A - Cartridge for recording media - Google Patents

Abstract

The present invention relates to a cartridge for protecting a recording medium from external pollutants and impact sources.

The cartridge for a recording medium according to the present invention includes a recording medium on which information is recorded, a housing on which the recording medium is mounted, and at least one guide member having different intervals so as to be differentially guided to the air flow mounted on the housing. do.

By such a configuration, the cartridge for a recording medium according to the present invention has a uniform characteristic throughout the disc by at least one guide member having different intervals of flow rate and pressure characteristics around the asymmetric recording medium. Minimize the effects of unbalanced fluid flow that causes vibrations and oscillations in the system.

Description

Cartridge for Recording Media

The present invention relates to a recording medium, and more particularly, to a cartridge for protecting the recording medium from external pollutants and impact sources.

In recent years, recording media capable of recording as well as reproduction have been developed and distributed. Examples of recordable recording media include Digital Versatile Disc-RAM (hereinafter referred to as "DVD-RAM") and Magneto-Optical Disc (hereinafter referred to as "MOD"). Such a recordable recording medium is generally stored in a protective cartridge (Cartridge) to prevent contamination and damage by external pollution and impact sources. This cartridge is provided with an opening that can be opened and closed. This opening is used to secure the head access area by exposing the information recording surface of the recording medium. When the disc is mounted on the cartridge, the vibration characteristics are remarkably deteriorated due to the interference of air flow inside the cartridge as compared to the bare disc, which is not mounted on the cartridge. It can be an obstacle to the trend. The air flow around the disk mounted on the cartridge causes spiral air flow due to the asymmetry of the cartridge due to the presence of the opening when the disk is rotated, and vortex and backflow occurs in the space inside the cartridge, causing the disk to swing and vibrate. Cause it. Due to this phenomenon, deformation occurs unevenly on the disk and data is recorded at an incorrect position when recording information, thereby causing a recording position error. On the other hand, incorrectly recorded data causes a lot of problems in data recovery during reproduction.

It is therefore an object of the present invention to provide a cartridge for a recording medium which controls the air flow inside the cartridge to reduce the unbalanced flow air pressure and flow rate distribution acting on the surface of the recording medium.

It is another object of the present invention to provide a cartridge for a recording medium which enables accurate recording / reproducing of information by minimizing vibration of the recording medium by reducing an unbalanced fluctuation of air flow.

1 is a perspective view of a cartridge for a recording medium according to a first embodiment of the present invention.

FIG. 2 shows the ribs shown in FIG. 1 in detail. FIG.

3 is a view showing flow rate characteristics of a disc mounted in a conventional cartridge.

4 is a diagram showing pressure characteristics of a disk mounted in a conventional cartridge.

5 is a perspective view of a cartridge for a recording medium according to a second embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

2: cartridge housing 2a: opening

4,14 Rib 6: Hole

In order to achieve the above object, the cartridge for a recording medium according to the present invention has a recording medium on which information is recorded, a housing on which the recording medium is mounted, and a different distance to be mounted on the housing to differentially guide the air flow. At least one guide member is provided.

The recording medium cartridge according to the present invention includes a recording medium on which information is recorded, a housing on which the recording medium is mounted, and an outer circumference of the recording medium to be mounted on the housing to guide air flow from the inner circumferential side to the outer circumferential side of the recording medium. At least one guide member which extends higher than the inner peripheral side is provided.

The cartridge for a recording medium according to the present invention includes a recording medium on which information is recorded, a housing on which the recording medium is mounted, and an inner circumferential side of the recording medium, which are mounted on the housing, are elongated higher and arranged at different intervals from each other. At least one guide member for guiding air flow is provided.

Other objects and advantages of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5.

1 shows a cartridge for a recording medium according to an embodiment of the present invention.

1, the recording medium cartridge of the present invention includes an upper and lower cartridge housing 2 and air flow guide ribs 4 arranged at different intervals inside the cartridge housing 2; .

Air flow guide ribs (hereinafter, abbreviated as "ribs") 4 may be formed only in any one of the upper and lower cartridge housings 2 and formed in both the upper and lower cartridge housings 2. Can be. The ribs 4 serve to guide the air flow generated from the inner circumference to the outer circumference as the disk rotates, and in particular, the outer circumference of the disk 1 at a faster flow rate of the air flow on the opposite side than the opening 2a side. By guiding to be discharged toward the side, a uniform flow velocity distribution and pressure distribution can be formed with respect to the disc 1. To this end, the ribs 4 are arranged adjacent to each other at an angle narrowed toward the opposite side from the opening 2a side as shown in FIG. 2. That is, the gaps between the adjacent ribs 4 toward the opposite side of the opening 2a are arranged at intervals of θ1 to θ4, respectively, and the relationship is θ4> θ3> θ2> θ1. As the shape of these ribs 4 is in the circle of FIG. 1, since the inner circumferential side of the disk 1 has a larger air flow than the outer circumferential side, the height of the ribs 4 is higher in the inner circumferential side and becomes smaller toward the outer circumferential side. If the height of the inner circumferential end is b and the height of the outer circumferential end is a so that air flow can flow out quickly from the side to the outer circumference, b> a. That is, the height of the ribs 4 is different depending on the radial direction r with respect to the disc 1, so that the height increases toward the inner circumference (ie, the smaller r) and lower toward the outer circumference (ie, the larger r). . Here, the height difference ΔH = b-a of the ribs 4 may vary based on a region in which the air flow rate is high and the pressure is low, or in which the air flow flow rate is relatively weak and the pressure is high. For example, the inner circumferential height b with respect to the disk 1 will be described with respect to the former case. The inner circumferential height of the ribs 4 located in the region where the flow velocity of air flow is high and the pressure is low is defined by the ribs located in the adjacent region ( It can be lower than the inner circumferential height of 4). And the inner circumferential height of the ribs 4 located in the region where the flow velocity of the air flow is weak and the pressure is high can be higher than the inner circumferential height of the ribs 4 located in the adjacent region. The height a of the outer circumferential side of the ribs 4 may also vary based on the same concept. That is, if the height (b, a) of the inner circumferential side and the outer circumferential side of the ribs 4 is properly designed on the basis of the above concept, the air flow flows out to the outside at a differential flow rate with respect to the entire surface of the disc 1 to be uniform. It is possible to obtain a flow rate characteristic and a pressure characteristic.

In addition, the recording medium cartridge according to the present invention has holes 6 formed between the ribs 4 in the cartridge housing 2. These holes 6 allow the flow of airflow flowing between the ribs 4 out of the cartridge to minimize vortex and backflow in the cartridge. Here, the holes 6 may be arranged in equal numbers between the adjacent ribs 4, but a larger number of holes 6 are disposed between the ribs 4 located opposite the openings 2a than the openings 2a side. Is preferably formed. This is because more air flow can be discharged on the opposite side of the opening 2a than on the opening 2a side. These holes 6 may be formed on the upper or lower surface of the cartridge housing 2 in which the ribs 4 are formed, but are not shown but may be formed between adjacent ribs 4 at the side wall of the cartridge housing 2. Can be. When the ribs 4 are formed on the side wall of the cartridge housing 2, they are formed between adjacent ribs 4 and formed on the opposite side than the opening 2a side with a larger diameter (or a larger number if the same diameter). It is preferable to.

It will be clearly shown through the following experimental results that the recording medium cartridge according to the present invention having such a configuration can make the unbalanced flow rate characteristics and the pressure distribution characteristics of the disc uniform. When rotating the disk 1 mounted in the conventional cartridge at 1200 RPM, the recording medium cartridge according to the present invention with reference to Figs. 3 and 4 showing the flow velocity vector and pressure distribution of the air flow to the disk (1). It will be described in detail. 3 and 4, when the disk 1 is rotated, one side of the opening 2a generates an air flow in the direction toward the disk 1, and the other side generates an air flow that flows outward and is asymmetric. Appears. 3, the flow velocity vector measured on the arbitrary centerline of the disk 1 at the time of rotating the disk 1 mounted in the cartridge is shown. Here, the density of the diagonal lines indicates the strength of the flow velocity and the direction of the diagonal lines indicates the direction of the flow velocity. As can be seen from the figure, the flow velocity distribution from the opening 2a side to the center of the disk 1 gradually decreases to 8.55 m / sec, 6.84 m / sec, 2.58 m / sec, 1.73 m / sec, and the disk 1 Adjacent to the center, it is significantly reduced to 0.0249 m / sec. In addition, the flow velocity distribution from the center of the disc to the opposite side of the opening 2a increases from 0.0249 m / sec to the outer periphery in the region adjacent to the center of the disc 1, reaching 1.73 m / sec, 2.58 m / sec and 6.84 from the outermost periphery. It appears at flow rates less than m / sec. That is, it can be seen that the flow rate of the air flow is considerably greater at the inlet side of the opening 2a than the opposite side. At the opening 2a side, the flow velocity of the air flow is directed upward of the rotational direction by adding θc by centrifugal force to the rotational direction (ie, the tangential direction) of the disk 1. The pressure distribution at this time is shown in FIG. In FIG. 4, the higher the density of the line, the greater the pressure than the non-region. As can be seen in the figure, a pressure range of -0.00795 to 0.00524 mN / mm ² distributed in a large elliptical region biased from the center of the disk 1 toward the opening 2a is an annular band-shaped region biased toward the opposite side of the opening 2a. Small pressures appear compared to the pressures of 0.00524 to 0.0212 mN / mm ² distributed at. The band-shaped pressure distribution region from the center of the disk 1 to the left half side is -0.0054 to -0.00795 mN / mm ² , which is lower than the peripheral region. Therefore, although not shown, the ribs 4 are arranged in the disc 1 center in a narrower region than the gaps of the ribs 4 in which the left half-side region is disposed on the right half side, so that the pressure distribution characteristics of the left and right half sides are uniform. The vibration and vibration of the disk 1 can be prevented. The flow rate characteristics and pressure characteristics of the asymmetrical air flow act as a major cause of the disk 1 swinging eccentrically in different directions on the side of the opening 2a and the opposite side. It causes vibrations that are practically impossible. Accordingly, the ribs 4 are arranged at large intervals on the side of the opening 2a where the flow velocity of the air flow is relatively fast and small pressure is applied to guide the air flow at a gentle flow rate, and at narrow intervals on the opposite side of the opening 2a. It is arranged to guide the air flow to be discharged at a high flow rate to obtain the flow rate characteristics and pressure characteristics of the uniform (uniform) air flow throughout the disk (1).

5 shows a cartridge for a recording medium according to another embodiment of the present invention.

In the configuration of Fig. 5, the recording medium cartridge of the present invention is formed with ribs 14 located on the opening side 2a and different lengths L on the opposite side. The ribs 14 are designed such that the length L becomes shorter from the opposite side of the opening 2a toward the opening 2a, and the lengths of the ribs 14 arranged from the opposite side of the opening 2a toward the opening 2a, respectively, are L1, If L2, L3, L4, L1> L2> L3> L4, the guide path length of the air flow is different. These ribs 14 guide air flow at a gentle flow rate at the opening 2a side and guide air flow at a high flow velocity at the opposite side of the opening 2a by different guide path lengths of the air flow. As for the ribs 4 shown in Fig. 1, the intervals between these ribs 14 are arranged at a narrower side than the opening 2a side, and the height of each rib is higher than the outer peripheral side. Is designed. These ribs 14 have an inner circumferential side of the outer circumference if the width of the inner circumferential side is c and an outer circumferential side of the disc 1 so that air flows out at an inner circumference from the inner circumference of the disk 1 at a high flow rate. It is designed as c> d so as to be larger than the side, and becomes trapezoidal shape. In addition, as with the holes 6 shown in FIG. 1, more holes 6 are formed on the opposite side than the opening 2a side.

As a result, the ribs 4, 14 shown in Figs. 1 and 5 have asymmetrical spacing in the disk 1 in the up-down direction (an extension line in the opening and the opposite direction) and are symmetrically arranged left and right. In this case, the present invention can be applied to any recording medium, but it is particularly preferable to use the recording medium having a recording surface having both upper and lower sides such as a DVD-RAM. This means that when the ribs 4 and 14 have a symmetrical arrangement, even if the information is recorded / reproduced while rotating the respective recording surface side A and side B in a recording medium having a double-sided recording surface such as a DVD-RAM, each recording surface This is because they have the same arrangement structure. Meanwhile, as can be seen from the flow velocity and pressure distribution characteristics of FIGS. 3 and 4, the disk 1 has different flow velocity characteristics and pressure characteristics not only in the vertical direction but also in the left and right directions. For this reason, the space | interval of the ribs 4 and 14 is largely arrange | positioned in the area | region which the flow velocity of air flow is quick and small pressure not only in the up-down direction of a disc 1 but also in the left-right direction, and vice versa (relatively) It is desirable to guide the air flow at a high flow rate by arranging the gap between the ribs 4 and 14 in a region where the air flow rate is slow and the pressure is large). The ribs 4, 14 having an asymmetrical arrangement structure in the up, down, left and right directions can be preferably applied to a cartridge of a recording medium having a recording surface of a cross section such as a CD-ROM. In detail, when a cartridge having an arrangement structure of ribs 4 asymmetric in the up, down, left and right directions is applied to a recording medium having double-sided recording surfaces, interference is caused to interfere with the flow direction of air flow due to a different arrangement structure on each recording surface. While this may appear as water, this problem does not need to be taken into account in a recording medium having a recording surface in section. In the case of a recording medium having a recording surface having a cross section, each of the ribs 4 and 14 may be formed in a spiral shape in the air flow direction so as to guide the air flow flow in a spiral direction from the inner circumference to the outer circumference of the disc 1 without resistance. . As such, if the spacing, height, and length of the ribs 4 applied to the recording medium cartridge according to the present invention are properly designed based on the flow rate distribution and the pressure distribution characteristics, the unevenness applied to the disc 1 may be reduced. The flow velocity distribution and pressure distribution characteristics of the air flow can be made uniform, and furthermore, the vibration and fluctuation of the disk 1 can be effectively suppressed even when applied to either a recording medium having a recording surface of one side or a recording medium having a double-sided recording surface. It becomes possible.

As described above, the cartridge for a recording medium according to the present invention has a uniform characteristic of the entire disc by at least one guide member having different intervals of flow rate and pressure characteristics around the asymmetric recording medium. Minimize the effects of unbalanced fluid flow that causes vibrations and oscillations in the system. Furthermore, the recording medium cartridge according to the present invention can secure reliability and accuracy in recording / reproducing information by minimizing vibration of the recording medium by ribs having a differentially arranged arrangement structure.

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.

Claims (11)

A recording medium on which information is recorded; A housing in which the recording medium is mounted; And at least one guide member mounted on the housing and having different intervals to differently guide the air flow. The method of claim 1, At least one discharge port for discharging the air flow to the outside between the guide member is characterized in that the cartridge for recording. The method of claim 1, And the guide members are arranged in an arrangement structure with differential intervals in the vertical direction of the opening side and the opposite side formed in the recording medium. The method of claim 3, wherein And the guide members with respect to the recording medium have a symmetrical arrangement in a horizontal direction perpendicular to the vertical direction. The method of claim 3, wherein And the guide members have an asymmetrical arrangement in the vertical direction and the left and right directions with respect to the recording medium. The method of claim 1, The guide members are adjacent at large intervals in any first region of the recording medium having a low flow rate and low pressure of the air flow, And the guide members are adjacent at a narrow interval in any second region of the recording medium having a low flow rate and a high pressure of the air flow. The method of claim 1, And the guide members are formed in the housing at different angles from the center of the recording medium. The method according to claim 6 or 7, The guide members in the first region are adjacent at a large angle, And the guide members in the second area are adjacent at small angles. The method of claim 1, And the guide member is helically rounded in the same manner as the air flow direction having the helical direction from the inner circumference to the outer circumference of the recording medium. A recording medium on which information is recorded; A housing in which the recording medium is mounted; And at least one guide member mounted on the housing and extending at an inner circumferential side higher than an outer circumferential side of the recording medium to guide air flow from the inner circumferential side to the outer circumferential side of the recording medium. . A recording medium on which information is recorded; A housing in which the recording medium is mounted; And at least one guide member mounted on the housing and having an inner circumferential side extending higher than an outer circumferential side of the recording medium and arranged at different intervals to guide air flow.