KR20040099948A - Mini optical information storage medium having High density - Google Patents

Abstract

PURPOSE: A small-sized high-density optical information storage medium is provided to newly define a clamping area and an information area while reducing a disk thickness, in order to obtain a high-density recording capacity as maintaining recording and/or reproducing properties of a disk. CONSTITUTION: An information area(IA) consists of a data area(40) where user data is recorded, a lead-in area(30) adjacent to an inner side of the data area(40), and a lead-out area(50) adjacent to an outer side of the data area(40). An area(25) is formed with a stack ring for preventing an information surface from being damaged owing to a disk information surface contact by other disk when a fabricated disk is loaded. The entire diameter of an optical information storage medium is less than 65mm, while the medium is 0.35 to 0.9mm in thickness. A start position of a clamping area(20) is at least more than 3mm in diameter.

Description

Mini optical information storage medium having high density

The present invention relates to a compact, high density optical information storage medium with good recording and / or reproducing characteristics and high density recording capacity.

In general, an optical information storage medium is classified into a compact disk (CD) and a digital versatile disk (DVD) according to the information recording capacity. In addition, a mini disk (MD) having a disk diameter of 65 mm or less may be further added. Furthermore, disks with a capacity of 20GB or more are being developed.

These optical discs can be further subdivided into read-only discs and rewritable discs. Read-only disks include CD-ROM (Read Only Memory) and DVD-ROM, and recordable disks include CD ± R / RW, DVD ± R / RW, and Random Access Memory (DVD-RAM). CD-R and DCD-R can only record once, CD-RW and DVD-RW can record and / or play about 1000 times, and DVD-RAM can record and / or play hundreds of thousands of times. .

CD has a total thickness of 1.2 mm and is made of polycarbonate (PC). The CD is reproduced by a laser diode having a wavelength of 780 nm, the track pitch is 1.6 mu m, and has a recording capacity of 650 MB in a cross section having an outer diameter of 120 mm.

In case of DVD, it is made of 1.2mm by attaching 0.6mm thick polycarbonate reinforcement board to 0.6mm thick board to make it compatible with CD drive. When the DVD is a single-sided disc having a diameter of 120 mm, the recording capacity is 4.7 GB. In the case of a DVD double-sided disc, two 0.6 mm discs are joined together to realize a recording capacity of 9.4 GB. The DVD is reproduced by a laser diode with a wavelength of 650 nm and an objective lens with a numerical aperture of 0.65. The track pitch is about 0.74 mu m. In the case of a DVD disc with a diameter of 80 mm, the recording capacity is 1.47 GB, which has a capacity of two CDs.

In addition, a high-density (HD) -DVD disc, which is a high density disc, has a recording capacity of about 25 GB in a 120 mm diameter cross section. This HD-DVD is recorded and / or reproduced by a laser diode having a wavelength of 400 nm and an objective lens having an aperture of 0.85, and has a track pitch of about 0.3 mu m. In addition, in the case of an 80-mm diameter HD-DVD disc, the recording capacity is about 7.8 GB.

On the other hand, HD (High Density) TVs require a disc capable of recording and / or playing back a 135-minute movie for HD. The recording capacity is not yet standardized, but 23GB or more is recorded on a cross section of a 120mm diameter disc. And / or be able to play back.

In the case of CD and DVD, the standard for each is as follows.

CD DVD Disc diameter (mm) 120 120 Disk thickness (mm) 1.2 1.2 Information board thickness (mm) 1.2 0.6 Track Pitch (μm) 1.6 0.74 Minimum Feet Size (μm) 0.83 0.4 Wavelength of laser beam (nm) 780 635/650 Objective lens numerical aperture (NA) 0.5 0.65 Single Board Capacity (GB) 0.65 4.7 (1.47)

Referring to the general structure of a disc 1 such as a CD or a DVD, as shown in FIG. 1, the clamping area 20 for seating the disc 1 on the center hole 10, a turntable of a reproduction drive to be described later, is shown. The lead-in area 30 in which information related to the disc is recorded, the data area 40 in which user data can be recorded, and the lead-out area 50 at the end of the data recording area.

In the lead-in area 30, reproduction-only data such as the size of the disk 1, the number of track layers on the read surface, or copy protection information can be recorded, and the data area 40 allows the user to record information. And / or playable area. In the lead-out area 50, information related to other discs is recorded. Reference numeral 25 denotes an area in which stacking is formed for preventing productivity degradation due to contact of the disc recording surface when stacking the discs produced during the disc ejection operation.

2 shows a disc chucking device for playing the disc 1. Here, the chucking device of the disk 1 includes a spindle motor 60 for rotating the disk 1, a turntable 63 fixed to a rotation shaft of the spindle motor 60, and on which the disk is seated, and the disk 1. ) Is clamped on the turntable 63. The disk 1 is compressed and fixed between the turntable 63 and the clamping member 65 so that information can be reproduced without shaking when the disk 1 is rotated by the spindle motor 60.

In this case, a protrusion 63a protruding from the center of the turntable 63 is inserted into the center hole 10, and a magnetic body 64 is provided on the turntable 63 or the clamping member 65. The disk 1 is fixed. In this case, the area in contact with the clamping member 65 in the disk 1 becomes the clamping area 20.

In a conventional CD or DVD disc, when the outer diameter? T of the whole disc is 120 mm or 80 mm, the size of the center hole 10 is 15 mm in diameter? H. In addition, the clamping region 20 has a diameter in the range of 22-33 mm.

On the other hand, the lead-in area 30 is 46-50 mm in diameter for CD, 45.2-48 mm for DVD, and the inner diameter phi d of the data area 40 is 48.2 mm. In the case of DVD + RW, the inner diameter? I of the lead-in area 30 is defined as 44.0 mm. The lead-out area 50 has an outer diameter? Oe of 117 mm for a 120 mm diameter disk, and an outer diameter? Oe of 78 mm for a 80 mm diameter disk.

However, according to the trend of miniaturization of the disk, when the total diameter of the disk is small, for example, when the total diameter (φt) of the disk is 65.0 mm, the position (Φd) where the user data starts like the CD or DVD is 48.2 mm in diameter. In this case, the data recording capacity is not sufficiently secured. Moreover, application of the above provisions up to the case of a disc whose total diameter of the disc is 50 mm results in virtually no data area. If the center hole 10 of the disk is made smaller than 15 mm in diameter to compensate for the insufficient data area, a problem arises in compatibility with the drive of the disk having a total diameter of 120 mm or 80 mm.

Another method for securing the recording capacity of a small disc is to reduce the size of the clamping area 20. The dimension of the clamping region 20 is determined by the deflection of the disk, the number of revolutions of the spindle motor 60 or the clamping force of the disk, because reducing the clamping region 20 deteriorates the vibration characteristics of the disk. There are certain constraints on reducing the clamping area. On the other hand, the clamping area 20 is limited to the diameter (φ c) within 33.0mm according to the standard, the outer diameter of the spindle motor 60 for the CD-ROM or DVD-RAM is currently 28.0mm or less, the turntable 63 The outer diameter of is less than 30.0mm, and satisfies the diameter of the clamping area of the disk within 33.0mm diameter.

In the case of using a disk having a small diameter in consideration of portability as described above, when the diameter of the disk is reduced, the recording capacity is reduced, and there is a problem that sufficient data cannot be recorded. In addition, there is a restriction on repetitive recording, which restricts free editing, which inevitably becomes an obstacle to increasing the added value of data.

Accordingly, an object of the present invention is to provide a compact optical information storage medium with good recording and / or reproducing characteristics and high density recording capacity.

1 is a perspective view of a conventional optical information storage medium.

2 is a cross-sectional view schematically illustrating a state in which an optical information storage medium is clamped to a disk drive.

3 is a cross-sectional view of a compact optical information storage medium according to the present invention.

4A, 4B, and 4C are graphs showing clamping force required by the thickness of the clamping region according to the thickness of the disk when the optical information storage media according to the present invention have diameters of 30 mm, 47 mm, and 50.8 mm, respectively.

5A, 5B and 5C show the thickness of the disc when the dimensions Ca of the clamping region of the optical information storage medium according to the present invention are 3.0 <Ca <5.0, 5.0 <Ca <7.0, 7.0 <Ca <9.0 This is a graph showing the clamping force required accordingly and the clamping force achievable with the desired yoke and magnet structure.

6 illustrates a structure in which a hub is coupled to a central hole of an optical information storage medium according to the present invention.

7A illustrates an example in which stacking is formed on a non-information surface of an optical information storage medium according to the present invention.

7B illustrates an example in which stacking is formed on an information surface of an optical information storage medium according to the present invention.

8 shows an example of a turntable on which an optical information storage medium according to the present invention is mounted.

<Explanation of symbols for main parts of the drawings>

100 ... optical information storage medium 10 ... central hole

20 ... Clamping area 30 ... Lead-in area

40 ... data area 50 ... readout area

55 ... substrate 57 ... light transmitting layer

dH ... Center hole diameter dC ... Clamping area outer diameter

dI ... Inner diameter of lead-in area dD ... Inner diameter of data area

dO ... Leadout area inner diameter dL ... Leadout area outer diameter

dT ... disc diameter T ... disc thickness

t ... light-transmitting layer thickness 73 ... stacking

In order to achieve the above object, the compact high density optical information storage medium according to the present invention comprises a central hole, a clamping area, and an information area in which data is recorded.

The total diameter is 65 mm or less, the total thickness is in the range of 0.35-0.9 mm, and the starting position of the information area is in the range of 8-15 mm in diameter.

Preferably, the center hole is in the range of 2-5 mm in diameter.

Preferably, the starting position of the clamping region is in the range of 3-9 mm in diameter, and the outer diameter of the clamping region is in the range of 5-11 mm.

The track pitch of the optical information storage medium is in the range of 0.25-0.55 μm, and the minimum mark length is in the range of 0.05-0.2 μm.

The hub is made of a magnetic material is coupled to the center hole.

The clamping force corresponding to the clamping region is in the range of 7 to 70 gf.

In order to achieve the above object, the information storage medium according to the present invention comprises a central hole, a clamping area and an information area, the total diameter is 65mm or less, the total thickness is 0.35-0.9mm, the starting position of the clamping area Is in the range of 3-9 mm in diameter and has a capacity of 1 Gb or more.

When the total diameter of the optical information storage medium is 47 mm, the information area has a size in the range of 12-45.1 mm in diameter.

When the total diameter of the optical information storage medium is 50.8mm, the information area has a size in the range of 12-48.9mm in diameter.

The clamping force is characterized in that it increases in proportion to the double speed.

In order to achieve the above object, an optical information storage medium according to the present invention comprises a central hole, a clamping area, and an information area in which data is recorded.

The total diameter is less than 65mm, the total thickness is within the range of 0.25-0.8mm, characterized in that the starting position of the information area has a range moved within a radius of 0.5-2mm in the inner radial direction from the outer peripheral surface.

It is preferable that the position where the information area ends is in the range of 8-15 mm in diameter.

Hereinafter, a compact high density optical information storage medium according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of a compact high-density optical information storage medium according to the present invention. The optical information storage medium 100 includes a center hole 10, a clamping area 20 in which the optical information storage medium is seated on a turntable, and information. Includes an information area IA to be recorded.

The information area IA includes a data area 40 in which user data is recorded, a lead-in area 30 adjacent to the inside of the data area 40, and a lead-out area 50 adjacent to the outside of the data area 40. It is configured to include). Reference numeral 25 may be an area in which stacking is formed to prevent the information surface from being damaged due to contact of the disk information surface by another disk when the disks produced during the ejection operation of the disk are stacked. Stacking will be described later with reference to FIGS. 7A and 7B. Meanwhile, although the center hole 10 and the clamping region 20 may be directly connected without an empty space, an empty space may be formed between the center hole 10 and the clamping region 20.

In the optical information storage medium according to the present invention, the total diameter dT is 65 mm or less, the total thickness T is 0.35-0.9 mm, and the starting position of the clamping region 20 is at least 3 mm in diameter. It is preferable.

The optical information storage medium includes a substrate 55 and a light transmitting layer 57. The thickness t of the light transmitting layer 57 has a range of 0.05-0.2 mm, and the thickness of the substrate 55 preferably has a range of 0.3-0.7 mm. Here, the light transmitting layer 57 is formed by spin coating on the substrate 55 or UV bonding a sheet. An information surface is formed on the substrate surface on which the light transmitting layer 57 is formed.

In addition, a land track and a groove track may be formed in the optical information storage medium, and information may be recorded in at least one of the land track and the groove track. Here, the track pitch is 0.25-0.55 탆 and the minimum mark length is in the range of 0.05-0.2 탆.

In FIG. 3, dH is the diameter of the center hole 10, dC is the outer diameter of the clamping region 20, dI is the inner diameter of the lead-in region 30, dD is the inner diameter of the data region 40, dO is the lead-out region The inner diameter of d50 and dL represent the outer diameter of the lead-out area 50, respectively.

In order to miniaturize the storage medium, the smaller the diameter dH of the center hole 10 is better, the smaller the center hole 10 is, the more difficult it is to overcome the rotational force of the disk. The diameter dH of 2 is preferably 2-5 mm.

In addition, in order to maximize the capacity, the starting position of the clamping region 20 should be minimized. The size of the clamping region 20 is determined by the deflection component of the storage medium, the rotational speed of the spindle motor, or the clamping force. In particular, the size of the clamping region 20 may be determined by obtaining the required clamping force according to the thickness and overall diameter of the storage medium, and determining whether the necessary clamping force is feasible according to the size change of the magnet and the yoke provided in the turntable. Can be.

The result of simulating the required torque according to the thickness (T) of the storage medium is shown in Table 1 for each type of storage medium according to the total diameter (dT) of the storage medium. Here, the simulation conditions are 1.76 mm / s (Constant Linear Velocity), the disk rotational speed is 2800 rpm, the time when the disk starts to rotate and reaches the rotational speed is 1.0 sec. Here, the total diameters (dT) of the disks are 30 mm, 47 mm, and 50.8 mm in consideration of compatibility with existing drives, and the results of simulation of the torques required for these sizes are shown in Table 1.

Full diameter Required Torque by Disc Thickness Rpm 0.4mm 0.6mm 0.7mm 30 mm 0.43 gcm 0.49 gcm 0.52 gcm 1400-2800 47 mm 1.00 gcm 1.35 gcm 1.52 gcm 747-2800 50.8mm 1.31 gcm 1.72 gcm 1.96 gcm 689-2800

The required clamping force can be obtained according to the change of the disk thickness T and the dimension Ca of the clamping region using the torques according to Table 2 above.

When the angular velocity of the motor changes, the inertia force in the rotational direction is generated due to the mass moment of inertia of the disk, and the torque Ts is generated by friction between the turntable and the clamper, and the clamping force F is obtained as follows.

Where μ is the coefficient of friction of the disc and r is the radius to where the clamping force is measured. According to Equation 1, the clamping force F required as the radius r increases, that is, as the clamping region increases, becomes smaller. Therefore, if the clamping force required at the start position of the clamping region is feasible, even if the clamping region becomes large, problems such as slipping or disc detachment during rotation of the disk do not occur. In addition, the larger the clamping area, the larger the size of the magnet and yoke, there is no difficulty in obtaining the desired clamping force. Therefore, the selection of the outer diameter of the clamping region can be freely made depending on the capacity if the clamping region is started from the minimum radius at which the clamping force required at the start position of the clamping region can be realized.

Table 3 shows the results of obtaining the clamping force required for the disk thickness 0.4 mm, 0.6 mm, and 0.7 mm, respectively, as the size Ca of the clamping region is changed by using Table 2 above. The results are shown graphically in FIGS. 4A, 4B and 4C. At this time, the friction coefficient of the turntable (not shown) is 0.2, the safety factor is 40%, the radius of the turntable is 3.45mm.

diameter thickness Clamping force (gf) required by changing clamping area 3.0 <Ca <5.0 (r = 2.0mm) 5.0 <Ca <7.0 (r = 3.0mm) 7.0 <Ca <9.0 (r = 4.0mm) 30 mm 0.4mm 15.1 10.1 7.5 0.6mm 17.0 11.4 8.5 0.7mm 18.1 12.0 9.0 47 mm 0.4mm 35.1 23.4 17.6 0.6mm 47.2 31.5 23.6 0.7mm 53.2 35.5 26.6 50.8mm 0.4mm 45.8 30.6 22.9 0.6mm 60.3 40.2 30.2 0.7mm 68.6 45.7 34.3

The required clamping force was measured at the point of r = 2.0mm at 3.0 <Ca <5.0, and the necessary clamping force was measured at the point of r = 3.0mm at 5.0 <Ca <7.0, and r = 4.0 at 7.0 <Ca <9.0. The required clamping force was measured at the point in mm.

Meanwhile, referring to FIG. 8, an example of the structure of the turntable 103 on which the information storage medium 100 according to the present invention is mounted is illustrated. The turntable 103 includes a protrusion 104 into which the magnet 105 and the information storage medium 100 are inserted, a magnet 105 mounted around the protrusion 104, and the storage medium to rotate. Spindle motor 107 to make. Reference numeral 106 denotes a body of the turntable. A hub 70, which will be described later, is formed in the center hole 10 of the information storage medium 100, and the hub 70 is made of a magnetic material and attached to the magnet 105.

In the turntable structure as described above, the thickness of the magnet 105 is, for example, 0.5 mm. Although not shown, using a first yoke of 0.4 mm thickness attached to the magnet 105, while changing the thickness of the second yoke installed at a predetermined interval from the magnet to 0.2 mm, 0.4 mm and 0.6 mm Table 4 shows the results of calculating the clamping force through finite element analysis. Here, the clamping force which can be realized according to the dimension Ma of the magnet and the first yoke is shown. The size Ma of the magnet and the first yoke may vary depending on the size Ca of the clamping region 20.

2nd yoke thickness Clamping force with magnet and first yoke size change 1.0 <Ma <3.0 3.0 <Ma <5.0 5.0 <Ma <7.0 0.2mm 23.5 (18.8) 101.0 (80.8) 235.6 (188.5) 0.4mm 28.6 (22.9) 106.1 (84.9) 239.7 (191.8) 0.6mm 31.6 (25.3) 109.1 (87.3) 242.8 (194.2)

In Table 4, the values in parentheses are the values obtained by correcting the finite element analysis results based on the experimental results. This is a value corrected with reference to the tendency that the analysis result value appears about 20% higher than the experimental result value. Values in parentheses are used as reference for determining the dimensions of the clamping area.

According to Table 4, when the thickness of the second yoke is 0.2 mm, the possible clamping force is about 18.8 gf for 1.0 <Ma <3.0, about 80.8 gf for 3.0 <Ma <5.0, and 5.0 <Ma <7.0 About 188.5gf.

FIG. 5A is a graph showing the clamping force required for the disc diameter by disc thickness when the dimension Ca of the clamping region 20 is 3.0 <Ca <5.0. Here, when the clamping force which can be realized by Table 4 is 19 gf, this feasible clamping force tm satisfies the clamping force required by a disk having a 30 mm diameter among disks having a disc diameter dT of 30 mm, 47 mm and 50.8 mm. Let's do it. The same result can be obtained even when the thicknesses of the second yoke are 0.4 mm and 0.6 mm. On the other hand, clamping areas of 3.0 <Ca <5.0 cannot be applied to 47mm diameter discs and 50.8mm discs.

FIG. 5B is a graph showing the clamping force required for the disc diameter by the disc thickness when the dimension Ca of the clamping region is 5.0 <Ca <7.0. Here, assuming that the feasible clamping force is 81 gf, this clamping force satisfies the clamping force required by a disk having a disc diameter dT of 30 mm, 47 mm and 50.8 mm. Here, considering that the size Ma of the magnet and the yoke is 3.0 <Ma <5.0 and the diameter of the spindle motor is 7.0mm, it is preferable that the dimension Ca of the clamping area is 5.0 <Ca <7.0mm.

FIG. 5C is a graph showing the clamping force required for the disc diameter by disc thickness when the dimension Ca of the clamping region is 7.0 <Ca <9.0 mm. Here, when the feasible clamping force is 188.5 gf, this clamping force satisfies the clamping force required for discs with disc diameters dT of 30 mm, 47 mm and 50.8 mm. In this case, therefore, all disks having a total diameter dT of 30 mm, 47 mm and 50.8 mm can be used. Here, as a result of analyzing the static deformation and the stress of the disk according to the change of the force required to remove the disk from the turntable, the deformation and stress of the disk in the required clamping force were not a problem to operate in the elastic region.

5A to 5C, the clamping region 20 may be started at a position of 3 mm or more in diameter. More preferably, the diameter of where the clamping region 20 starts may range from 3.0-9.0 mm. In addition, the diameter dC of the end of the clamping region 20 may be in the range of 5-11 mm. The clamping force corresponding to the clamping region 20 has a range of 7-70 gf. This clamping force is for 1x speed (CLV 1.76m / sec), and the clamping force increases in proportion to the double speed. For example, for a double speed optical information storage medium, the clamping force is in the range of 14-140 gf.

The start position of the information area IA may have a diameter dI of 8-15 mm depending on the disc capacity based on the position where the clamping area 20 ends. In addition, the position where the information area IA ends may be determined as a position moved within a radius of 0.5-2 mm in the inner radial direction from the disk outer peripheral surface. In this case, data is recorded and / or reproduced from the inside of the disc to the outward direction.

Conversely, the start position of the information area IA can be determined as the position moved within the range of 0.5-2 mm in the inner radial direction from the outer peripheral surface of the disc. At this time, data is recorded and / or reproduced from the outside to the inside of the disc. In addition, the position where the information area ends may have a diameter (dI) 8-15mm range.

The information area IA may include, for example, a lead-in area 30, a data area 40, and a lead-out area 50, and the size of these areas may be determined according to the capacity.

The following shows the dimensions of the center hole, the clamping area, the lead-in area, the data area, and the lead-out area for information storage media having a total diameter dT of 30.0 mm, 47.0 mm, and 50.8 mm, respectively.

Area ＼ Diameter 30 mm 47 mm 50.8mm Lead out area 28-28.016mm 45.0-45.1mm 48.8-48.9mm Data area 14.26-28mm 14.26-45.0mm 14.26-48.8mm Lead-in area 12-14.26mm 12-14.26mm 12-14.26mm Clamping area 3.0-5.0mm 5.0-7.0mm 5.0-7.0mm Concourse 2-3mm 2-5mm 2-5mm Volume 1.0 GB or more 4.0 GB or more 4.7 GB or more wavelength 405 nm 405 nm 405 nm Objective Lens NA 0.85 0.85 0.85 Track pitch 0.32 μm 0.32 μm 0.32 μm Mark length 0.138 / 0.149 / 0.16 μm 0.138 / 0.149 / 0.16 μm 0.138 / 0.149 / 0.16 μm Disc thickness 0.4-0.8mm 0.4-0.8mm 0.4-0.8mm

Based on Table 5, the layout for satisfying the specific disk capacity is summarized as follows. Here, the capacity may vary depending on the minimum mark length (MML). Minimum mark lengths may be, for example, 0.138 μm, 0.16 μm, 0.149 μm.

diameter 30.0mm 47.0mm 50.8mm Volume 1.30 GB 4.10 GB 4.82 GB Lead-in Area Volume 133 MB 133 MB 133 MB r _start 6.0mm 6.0mm 6.0mm r _end 7.13 mm 7.13 mm 7.13 mm Data area r _start 7.13 mm 7.13 mm 7.13 mm r _end 14.0mm 22.50mm 24.4 mm Lead-out Volume 17 MB 17 MB 17 MB r _strat 14.0mm 22.50mm 24.4 mm r _end 14.008mm 22.505 mm 24.404mm

In Table 6, the sizes of the lead-in 30, data area 40 and lead-out 50 are determined so that the capacities are 1.30 GB, 4.10 GB, and 4.82 GB, respectively, when the diameters are 30.0 mm, 47.0 mm, and 50.8 mm. It was. Here, r _start represents a radius at which each region starts, and r _end represents a radius at which each region ends. For example, the size of the lead-in area 30 ranges from 12-14.26 mm in diameter to satisfy a 1.30 GB capacity on a 30.0 mm diameter disk.

Table 7 shows the sizes of the lead-in area 30, the data area 40 and the lead-out area 50 so that the capacity is 1.26 GB, 4.05 GB, and 4.78 GB, respectively, when the diameter is 30.0 mm, 47.0 mm, and 50.8 mm. Was determined.

diameter 30.0mm 47.0mm 50.8mm Volume 1.26 GB 4.05GB 4.78 GB Lead-in Volume 173 MB 173 MB 173 MB r _start 6.0mm 6.0mm 6.0mm r _end 7.44 mm 7.44 mm 7.44 mm Data area r _start 7.44 mm 7.44 mm 7.44 mm r _end 14.0mm 22.50mm 24.4 mm Lead-out Volume 173 MB 173 MB 173 MB r _strat 14.0mm 22.50mm 24.4 mm r _end 14.008mm 22.505 mm 24.440mm

Table 8 shows the sizes of the lead-in area 30, the data area 40 and the lead-out area 50 so that the capacities are 1.19 GB, 3.97 GB, and 4.71 GB when the diameters are 30.0 mm, 47.0 mm, and 50.8 mm, respectively. Was determined. In Tables 7 and 8, the start position of the lead-in area 30 is 12.0 mm in diameter.

diameter 30.0mm 47.0mm 50.8mm Volume 1.19 GB 3.97 GB 4.71 GB Lead-in Volume 133 MB 133 MB 133 MB r _start 7.0mm 7.0mm 7.0mm r _end 7.99 mm 7.99 mm 7.99 mm Data area r _start 7.99 mm 7.99 mm 7.99 mm r _end 14.0mm 22.50mm 24.4 mm Lead-out Volume 17 MB 17 MB 17 MB r _strat 14.0mm 22.50mm 24.4 mm r _end 14.008mm 22.505 mm 24.404 mm

Table 9 shows the sizes of the lead-in area 30, data area 40 and lead-out area 50 so that the capacities are 1.15 GB, 3.94 GB, and 4.67 GB, respectively, when the diameters are 30.0 mm, 47.0 mm, and 50.8 mm. Was determined.

diameter 30.0mm 47.0mm 50.8mm Volume 1.15 GB 3.94 GB 4.67 GB Lead-in Volume 173 MB 173 MB 173 MB r _start 7.0mm 7.0mm 7.0mm r _end 8.26mm 8.26mm 8.26mm Data area r _start 8.26mm 8.26mm 8.26mm r _end 14.0mm 22.50mm 24.4 mm Lead-out area Volume 173 MB 173 MB 173 MB r _strat 14.0mm 22.50mm 24.4 mm r _end 14.008mm 22.505 mm 24.440mm

In Tables 8 and 9, the start position of the lead-in area 30 is 14.0 mm in diameter. The starting position of the lead-in area 30 may range from 8-15 mm depending on the disc capacity.

Taken together, Tables 6 to 9 show that the end position of the lead-in area 30 is in the range of 14.0-17.0 mm in diameter, and the end position of the data area 40 is in the range of 28.0-48.8 mm in diameter, depending on the disk capacity. And the end position of the lead-out area 50 may be in the range of 28.016-48.88 mm in diameter. The layouts shown in Tables 6 to 9 are determined based on a minimum mark length of 0.149 μm.

Meanwhile, in the optical information storage medium according to the present invention, referring to FIG. 6, it is preferable to couple the hub 70 to the center hole 10. In FIG. 6, only the substrate 55 is formed, and the light transmitting layer is in a state before being formed. An information surface 65 is provided on the lower surface of the substrate 55. A light transmitting layer is formed on the information surface 65. The clamping region 20 has a step corresponding to the thickness of the light transmitting layer t, and the hub 70 is coupled to this portion. The hub 70 is made of a magnetic material to be directly coupled to a turntable (not shown). Therefore, there is an advantage that the structure of the turntable becomes simple and the thickness thereof becomes thin. In addition, the hub 70 may prevent the disk from being eccentric or separated from the turntable by the rotational force of the disk.

On the other hand, a stacking 73 is formed on one side of the disc to prevent the disc information surface from being damaged by the other disc when the discs are stacked during disc manufacture. The stacking 73 may be recorded on the non-information surface 74 in which no information is recorded, as shown in FIG. 7A. When the stacking 73 is formed on the non-information surface 74, the stacking 73 is preferably formed inside the information area IA. If formed in the information area IA, when the disks are stacked, the stacking may be in contact with the information surface of the other disk, so that the stacking area 73 in the clamping area 20 and the area 25 except the information area IA may be used. ) Is preferably formed. In this way, when the stacking 73 is formed on the non-information surface 74, the disk stacked above is protected by the stacking 73, and the disk stacked below may be protected by the hub 70. Both sides can be protected. In addition, in the case of forming the stacking on the non-information surface 74, the stacking may be formed anywhere in the region except for the information area, and thus a margin for positioning may be greatly improved.

In addition, the stacking 73 may be formed on the information surface 75. In this case, the stacking 73 may be formed in the region 25.

Meanwhile, the optical information storage medium according to the present invention may be, for example, a phase change optical disk or a magneto-optical disk.

As described above, the compact high density optical information storage medium according to the present invention newly defines the clamping area and the information area so as to secure the high density recording capacity while maintaining the recording and / or reproducing characteristics of the disc, It is reduced. In addition, the disk diameter can be reduced in size to achieve portability and high density recording capacity.

Claims (31)

An optical information storage medium comprising a center hole, a clamping area, and an information area in which data is recorded, And a total diameter of 65 mm or less, a total thickness of 0.35-0.9 mm, and a starting position of the information area within a range of 8-15 mm in diameter. The method of claim 1, And the center hole has a diameter in a range of 2-5 mm. The method of claim 1, And a starting position of the clamping region is in a range of 3-9 mm in diameter. The method of claim 3, wherein And an outer diameter of the clamping region is in a range of 5-11 mm. The method according to any one of claims 1 to 4, And the optical information storage medium comprises a groove track and a land track, and is recordable on at least one of the groove track and the land track. The method according to any one of claims 1 to 4, And a track pitch of the optical information storage medium is in the range of 0.25-0.55 [mu] m. The method according to any one of claims 1 to 4, And the minimum mark length of said optical information storage medium is in the range of 0.05-0.2 [mu] m. The method according to claim 1 or 2, Optical information storage medium, characterized in that the hub is made of a magnetic material coupled to the central hole. The method according to claim 1 or 2, Optical information storage medium, characterized in that the stacking protruding to protect the information on the opposite side of the information recording surface. The method according to claim 1 or 2, And a stacking for protruding the information in a predetermined area of the surface where the information is recorded. The method according to claim 1 or 2, The optical information storage medium comprises a light transmission layer and a substrate, the light transmission layer is characterized in that the optical information storage medium having a thickness in the range of 0.05-0.2mm. The method according to claim 1 or 2, And a clamping force corresponding to the clamping region is in a range of 7 to 70 gf. The method according to claim 1 or 2, And a position in which the information region ends is moved within a radius of 0.5-2 mm in an inner radial direction from an outer circumferential surface. Including a central hole, a clamping area and an information area, An optical information storage medium having a total diameter of 65 mm or less, a total thickness of 0.35-0.9 mm, a starting position of the clamping region in a range of 3-9 mm in diameter, and a capacity of 1 Gb or more. The method of claim 14, Optical information storage medium, characterized in that the starting position of the information area is in the range of 8-15mm in diameter. The method according to claim 14 or 15, And when the total diameter of the optical information storage medium is 30 mm, the information area has a size in the range of 12-28.016 mm in diameter. The method according to claim 14 or 15, And the information area has a size in the range of 12-45.1 mm in diameter when the total diameter of the optical information storage medium is 47 mm. The method according to claim 14 or 15, And the information area has a size in the range of 12 to 48.9 mm in diameter when the total diameter of the optical information storage medium is 50.8 mm. The method according to claim 14 or 15, The central hole is an optical information storage medium, characterized in that having a diameter in the range of 2-5mm. The method according to claim 14 or 15, Optical information storage medium, characterized in that the hub is made of a magnetic material coupled to the central hole. The method according to claim 14 or 15, And a track pitch of the optical information storage medium is in the range of 0.25-0.55 [mu] m. The method according to claim 14 or 15, And the minimum mark length of said optical information storage medium is in the range of 0.05-0.2 [mu] m. The method according to claim 14 or 15, And a clamping force corresponding to the clamping region is in a range of 7 to 70 gf. The method of claim 23, wherein And the clamping force increases in proportion to a double speed. The method according to claim 14 or 15, The information area comprises a lead-in area, a data area and a lead-out area, the ending position of the lead-in area is in the range of 14.0-17.0 mm in diameter, the ending position of the data area is in the range of 28.0-48.8 mm, And the end position of the lead-out area is in the range of 28.016-48.88 mm. The method of claim 12, And the clamping force increases in proportion to a double speed. An optical information storage medium comprising a center hole, a clamping area, and an information area in which data is recorded, Optical information storage medium, characterized in that the total diameter is 65mm or less, the total thickness is within the range of 0.25-0.8mm, the starting position of the information area is moved within a radius of 0.5-2mm in the inner radial direction from the outer peripheral surface . 28. The optical information storage medium of claim 27, wherein a position where the information area ends is in the range of 8-15 mm in diameter. The method of claim 27 or 28, And the center hole has a diameter in a range of 2-5 mm. The method of claim 27 or 28, And a starting position of the clamping region is in a range of 3-9 mm in diameter. The method of claim 30, And an outer diameter of the clamping region is in a range of 5-11 mm.