JP2001243668A - Initializing method and initializing device for optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply initialize a phase transition type optical disk at high speed. SOLUTION: A long-length shaped laser spot 12 having the length of the diameter value or more of the optical disk 21 and initialization power is moved in the diameter direction of the optical disk so that the central position of the length of the laser spot 12 relatively passes through the vicinity of the center of the optical disk 2. Thus, the phase transition type optical disk is initialized at high speed with simplified constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for initializing a recording layer of an optical disk for recording and reproducing information by irradiating a laser beam. The present invention relates to a method and an apparatus for initializing a recording layer of an optical disc which can be performed.

[0002]

2. Description of the Related Art In general, examples of optical discs on which information can be recorded and rewritten at high density include phase-change type optical discs utilizing reversible characteristics of crystals and non-crystals, and magneto-optical discs utilizing the magneto-optical effect. This phase-change type optical disc changes the recording layer to crystalline or amorphous by the intensity of the laser light applied to the recording surface, and changes the information as a reflectance change by the reflectance change between the crystalline and amorphous. Since reading is performed, compatibility with a read-only disc (for example, a CD-ROM) or a write-once disc (for example, a CD-R) for reproducing information by detecting a change in reflectance is easy. This phase-change type optical disk does not require an external magnetic field to be applied at the time of recording on a magneto-optical disk, and thus has advantages such as a compact drive device.

The recording layer of the phase-change optical disk is formed by a sputtering method, a vacuum evaporation method, or the like, and the recording layer immediately after the formation is generally in an amorphous state. The amorphous phase change optical disk immediately after the formation is usually
The reflectivity of the optical disk drive in the laser wavelength band is extremely low, and the automatic focus control and tracking control, which are essential for recording and reproducing operations, become unstable. It is necessary to perform an operation of initialization for changing from an amorphous state immediately after formation to a crystalline state.

At present, a method of initializing a phase change type optical disk which is put into practical use is a method of irradiating a phase change type optical disk in an amorphous state with a laser beam. Hereinafter, an initialization apparatus and an initialization method will be described. This will be briefly described with reference to the drawings.

FIG. 1 is a diagram schematically showing a conventional initialization device. This initialization device includes a high-power semiconductor laser 1 which is a laser light source of several W class, and a laser radiated from the semiconductor laser 1. Using the beam as a light source, a laser head 4 having optical lenses 2, 2a for forming an elliptical laser spot 5 having a length in the longitudinal direction of about several hundred μm on the recording film 3 of the optical disk 6, and rotating the optical disk 6 Motor 7 and the laser head 4 for the optical disk 6
And a carriage (not shown) that moves in the radial direction 10.

FIG. 2 is a schematic diagram of a conventional initialization during execution viewed from the direction perpendicular to the optical disk surface. In this conventional initialization method, the optical disk 6 is rotated in the direction of an arrow 10a while irradiating the optical disk 6 with a laser spot extending in a direction (longitudinal direction 8) perpendicular to the track direction 9 of the optical disk, and focus control is performed on the recording film 3. The laser spot 5 is sent in the radial direction 10 of the optical disk 6 while performing the scanning, and is spirally scanned to initialize the entire recording film 3 of the optical disk 6.
The hatched portions in the drawing indicate the uninitialized portions 11, and the portions without hatching indicate the initialized portions 12.

As a document describing an initialization method according to the prior art, for example, a flash initialization method using a halogen lamp or a xenon lamp (JP-A-8-15334)
No. 3), an initialization method by high-frequency heating (Japanese Unexamined Patent Application Publication No.
176030), a method of initializing a laser beam by irradiating a laser beam (JP-A-4-186530, 8)
-124158). Also, a phase change optical disk which does not require the above-described initialization and a method of manufacturing the same (Japanese Patent Laid-Open No. 7-47822) have been proposed.
It has not yet been put to practical use.

[0008]

The above-described optical disk initialization apparatus according to the prior art is currently the mainstream.
It takes about one minute to initialize the entire surface of a 0 mm disk, and it takes longer to include the time to start and stop the rotation of the optical disk and the time to transport the optical disk to the initialization device. There was a problem to say. The initialization time is one digit or more, which is one minute or more, while the cycle time of a film forming apparatus for a phase change optical disk is about 5 seconds, and a plurality of initialization apparatuses are required for one film forming apparatus. There was a problem that it was necessary. As described above, although the demand for reducing the unit price of the disk is inevitable along with the spread of the phase change optical disk, the conventional optical disk initialization apparatus and method are:
The length of the tact time for initialization is one of the obstacles to improving disk productivity and reducing manufacturing costs.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the disadvantages of the above-described conventional optical disk initialization apparatus and method, thereby shortening the time required for optical disk initialization and simplifying the initialization equipment. An object of the present invention is to provide an optical disk initialization method and apparatus.

[0010]

According to the present invention, there is provided an initialization method for initializing a recording film of an optical disk by converging a laser spot on the optical disk. Moving a long laser spot having a length and initialization power in the diameter direction of the optical disc so that the center position of the length of the laser spot relatively passes near the center position of the optical disc. This is the first feature.

Further, the present invention relates to an initialization method for initializing a recording film in an initialization required area of an optical disc by focusing a laser spot on the optical disc, wherein the length of the recording film is not less than the width of the initialization required area of the optical disc. A second feature is that a long laser spot having initialization power is irradiated while being relatively rotated.

Further, according to the present invention, in the method for initializing each of the above features, ± 100 μm in the optical axis direction of the laser sport with respect to the focus position of the laser spot focused on the optical disk.
A third feature is that the length (half width of peak power) of the laser spot in the width direction is set to 20 μm or less within a range of m or less.

Further, the present invention relates to an initialization apparatus for initializing a recording film of an optical disk by focusing a laser spot on the optical disk. Fourth, an initialization unit for forming the spot and a mechanism for moving the laser spot in the diameter direction of the optical disc so that the center position of the length of the laser spot relatively passes near the center position of the optical disc.
The feature of.

Further, according to the present invention, there is provided an initialization apparatus for initializing a recording film in an initialization required area of an optical disk by focusing a laser spot on the optical disk. An initialization unit for forming a long laser spot having an optimized power, and a mechanism for irradiating the long laser spot relative to an initialization required area of the optical disc while relatively rotating the laser spot. 5.

Further, according to the present invention, there is provided the initialization apparatus according to the fourth or fifth aspect, wherein, within a range of ± 100 μm in the optical axis direction of the laser sport, based on the focal position of the laser spot focused on the optical disk. The length (half width of peak power) of the laser spot in the lateral direction is 20 μm
The following is a sixth feature.

Further, the present invention provides a method for controlling the diameter of an optical disk in a film forming apparatus after forming a recording film of an optical disk, or in a film forming apparatus other than the recording film after forming the recording film, in a bonding apparatus, or in a transporting apparatus. An initialization section for forming a long laser spot having the above-mentioned length and initialization power; and moving the optical disc in the diametrical direction of the optical disc such that the center position of the length of the laser spot passes near the center position of the optical disc. A seventh feature is that a moving mechanism for moving the laser beam is provided, and the initialization unit irradiates the elongated laser spot while moving the optical disk by the moving mechanism. Furthermore, the present invention
In the film forming device after forming the recording film of the optical disc, or in another film forming device other than the recording film after forming the recording film, in the bonding device, or in the transfer device, the length of the optical disc that is longer than the width of the initialization required area An initialization section for forming a long laser spot having initialization power; and a mechanism for irradiating the initialization required area of the optical disc while relatively rotating the long laser spot, An eighth feature is that a long laser spot is irradiated from the conversion section to a region requiring initialization.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and an apparatus for initializing an optical disk according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 3 is a diagram showing a laser spot irradiated on a recording film as viewed from a direction perpendicular to the optical disk surface, for explaining the optical disk initialization method according to the present embodiment.

In the initialization method according to the present embodiment, as shown in FIG. 3, the small oblong laser spots 13 to 18 overlap the ends adjacent in the longitudinal direction 22 and are linear and have a total spot length 19 of at least the optical disc 21. A long laser spot 12 having an outer diameter of 20 or more is formed, and the laser spot 12 (or the optical disk 21) is irradiated while moving in the radial direction of the optical disk, that is, in the direction 23 perpendicular to the longitudinal direction 22 of the laser spot. This initializes the optical disk.

That is, in the initialization method according to the present embodiment, an elongated laser spot 12 in which oblong laser spots 13 to 18 are arranged in a straight line is formed, and this elongated laser spot 12 is The optical disk is initialized by relatively moving on the optical disk 21 so that the center position of the length of the optical disk 21 relatively passes near the center position of the optical disk 21. FIG.
Indicates an optical disk which is being initialized while the long laser spot 12 is moving, a hatched portion in the drawing indicates an uninitialized portion 24, and a portion without hatching indicates the initialized portion 2.
5 is shown. In this embodiment, when the laser spot reaches the center of the disc, it is necessary to set the laser spot in the longitudinal direction so as to cover the outer diameter of the optical disc.

In the initializing method according to the present embodiment, the entire surface of the optical disk can be initialized by only one operation of linearly scanning the recording layer by the outer diameter of the optical disk 21 with the laser spot 12. The initialization time can be greatly reduced as compared with the method in which the optical disk is initialized while moving and rotating the optical disk in the radial direction.

The laser spot 12 according to the present embodiment
Has described an elongated laser spot in which oblong laser spots 13 to 18 are arranged in a straight line, but the present invention is not limited to this, and another arrangement may be used.
For example, according to the present invention, the long laser spots 12 are arranged in a zigzag pattern in which the longitudinal directions 26 of the laser spots 13 to 18 shown in FIG. 4A are not in a straight line, or as shown in FIG. Longitudinal direction 26 of laser spots 13-18
Are arranged so as to be inclined with respect to the traveling direction 23 of the laser spot, and when each of the spots 13 to 18 moves with respect to the traveling direction 23, an overlap 27 is formed and the total spot length 19 in the direction perpendicular to the traveling direction 23 is larger than the outer diameter of the optical disk. 20 is sufficient. That is, a long laser spot 1 according to the present invention.
No. 2 may be any arrangement as long as there is no overlap in the scanning trajectory with respect to the laser spot traveling direction 23, an overlap 27 is formed, and the total spot length 19 in the direction perpendicular to the traveling direction 23 is equal to or larger than the outer diameter of the optical disk. Laser spots 13-18
Is also arbitrary.

In the initial method according to the embodiment shown in FIG. 4, the entire surface of the optical disk can be initialized only by one operation in which the laser spot 12 linearly scans the recording layer by the outer diameter of the optical disk 21. Therefore, the initialization time can be significantly reduced.

Next, an embodiment of an initialization apparatus for realizing the initialization method will be described with reference to FIG. The initialization device according to the present embodiment includes six high-power semiconductor laser arrays 2.
8-33, a collimating lens 34, an objective lens 35 for condensing a laser beam, a half beam splitter 36, a power monitor 37 corresponding to each laser array output, and a laser output for independently controlling the output of each laser array And a control unit 38.

The one high-power semiconductor laser array 28
33 are individually composed of a large number of small lasers and have a total output of several tens of watts to several hundreds of watts. Further, the collimating lens 34 and the objective lens 35 have a cylindrical shape with respect to the longitudinal direction 39 of the laser spot, and do not particularly focus laser light in the longitudinal direction of the laser spot irradiating the recording layer 41 of the optical disc 40. Form a field pattern.

In the optical system such as the lens, the longitudinal direction of the laser spot is located on a straight line, the overlap strength with the adjacent laser spot becomes a predetermined value, and the total spot length of the optical disk is initialized. Arrange so that the outer diameter is equal to or larger than the outer diameter. The output light from each of the laser arrays 28 to 33 is split by the half beam splitter 36,
The data is converted into an electric signal by the power monitor 37 corresponding to each laser array. The laser output control unit 38 performs feedback control for adjusting the laser current based on the power monitor value converted into an electric signal, and controls the output values of each laser array to be the same.

FIG. 6 shows the laser spot intensity distribution on the recording film of the optical disk by this initialization device. The vertex of the intensity distribution 42 in the longitudinal direction of the laser spot according to the present embodiment is substantially constant as shown in FIG. 6B, and the light intensity distribution in the lateral direction of the laser spot is Gaussian distribution 43 as shown in FIG. Becomes The depth of focus of the laser spot in the lateral direction is ± 100 with respect to the optical axis direction of the laser beam with reference to the focal position of the laser spot 44 focused on the recording film 41.
Within the range of μm, the length (half width of the peak power) of the laser spot in the lateral direction is 20 μm or less to 0.1 μm.
It is adjusted by an optical system so as to obtain a spot of m or more.

This adjustment method can be performed, for example, by adjusting the N of the objective lens.
When the laser oscillation wavelength is 800 nm, NA can be achieved at about 0.05 to 0.1. This adjustment is performed by changing the position of the optical disk in the optical axis direction, that is, the laser spot caused by the surface deflection of the optical disk. A change in length in the short direction can be reduced. The reason for setting the length of the laser spot in the transverse direction to a spot width of 20 μm or less is as follows.
This is for preventing the irradiated heat from being transmitted to the disk substrate and deformed.

The optical disk initialization apparatus configured as described above keeps the disk runout range within a predetermined value, thereby eliminating the need for automatic focus control, thereby simplifying the mechanical system and control system. it can. In the present embodiment, an example is described in which a far field pattern is used without focusing in the longitudinal direction of the laser spot, but the present invention is not limited to this. Although six high-power semiconductor laser arrays are used, the number is not limited to six, and the number can be changed according to the required energy density of the laser spot.

Next, an initialization apparatus according to another embodiment of the present invention will be described with reference to FIG. According to the present embodiment, the initialization device is obtained by adding a linear moving mechanism of an optical disk to the initialization device of FIG. 5 described above. This additional mechanism includes a disk supporter 47 for fixing the optical disk 46, and a disk supporter 47. Linear motor moving section 48 for linearly moving
And a linear motor rail section 51 and a linear motor speed control section 49. The longitudinal direction of the laser spot 50 is substantially perpendicular to the optical disk moving direction 51a, and the short side direction of the laser spot is the recording layer of the optical disk 46. The initialization section 45 is arranged so as to be focused.

The initialization section 45 is fixed to a linear motor rail section 51, and the linear motor movable section 48 on which the optical disk 46 is mounted moves linearly on the rail section 51 so that a laser spot is formed on the optical disk recording film. Are configured to scan in a straight line. The linear motor speed control unit 49 controls the speed of the linear motor movable unit 48 so that the speed becomes a predetermined speed while the optical disk passes over the laser spot. The disk supporter and the linear motor do not require the automatic focus control during the linear scanning by having a structure in which the disk surface vibration is suppressed within ± 100 μm at the laser spot irradiation position.

The moving speed of the optical disk 46 can be arbitrarily determined according to the length and intensity distribution of the laser spot in the lateral direction, the laser output, and the sensitivity relating to the initialization of the recording film. The heat applied to the recording film by the laser irradiation may propagate to the optical disk substrate and deform the optical disk substrate. Conversely, if the speed is too high, the recording film may not be initialized. It is desirable to set the speed to an appropriate speed in accordance with, for example, a practical value is 0.1 m / s to 1 m / s.
Preferably it is 2 m / s.

The initialization apparatus according to this embodiment has an outer diameter of 1
1.2 s (= 0.12 / 0.1) when a 20 mm optical disk is initialized with the moving speed set to 0.1 m / s
And can be initialized in a very short time. Further, the present apparatus can prevent useless laser irradiation by irradiating the laser only when the optical disk passes the laser spot irradiation position, and can contribute to prolonging the life of the laser.
In the present embodiment, an example in which the optical disk moves is described. However, it is sufficient that the optical disk moves relative to the elliptical laser spot and the optical disk. For example, the laser spot may move. .

In the above embodiment, an example was described in which a long laser spot having a diameter equal to or larger than the diameter of the optical disk was used. However, the present invention is not limited to this. A configuration in which rotational scanning is performed may be adopted. FIG. 8 is a diagram for explaining an initialization method according to still another embodiment.

FIG. 8 is a diagram showing the laser spot irradiated on the recording film as viewed from the direction perpendicular to the disk surface. The laser spot according to this embodiment has two small laser spots 52.
And 53. These laser spots 52 and 53 are arranged on the radius of the optical disk such that their respective oval and longitudinally adjacent ends overlap and are aligned. The total laser spot length 54 of the two laser spots 52 and 53 is a total laser spot length 54 that is at least longer than the width 55 of the initialization required area in the radial direction of the optical disc, and covers the width 55 of the initialization required area. To place.

In this initialization method, the optical disk is rotated by one or more rotations so that the long laser spot formed by the two laser spots 52 and 53 scans in the circumferential direction of the optical disk. The recording film of the optical disk is collectively initialized by moving the recording film by one or more turns in the circumferential direction. That is, in the initialization method according to the present embodiment, a long laser spot having a length equal to or longer than the width of the initialization required area 55 and having initialization power is rotated relatively to the initialization required area 55 of the optical disk. The recording film of the optical disc is collectively initialized by irradiation. In the figure, the hatched part is the uninitialized part 5
6 shows an initializing unit 57 without hatching.

In the initialization method according to the present embodiment, since the laser spot can initialize the entire optical disk by scanning the optical disk recording layer at least in one rotation of the optical disk, the initialization execution time can be shortened.

In this embodiment, the laser spots are arranged on the radius of the optical disk so as to be aligned, but the longitudinal direction 26 of each laser spot may not be aligned as shown in FIG. Further, as shown in FIG. 4B, the longitudinal direction 26 of each laser spot need not be perpendicular to the traveling direction 23 of the laser spot. In any case, there is no overlap between the scanning trajectories in the laser spot traveling direction 23 and an overlap 27 is formed, and the total spot length 19 in the direction perpendicular to the laser spot traveling direction 23 is equal to or more than the required initial area width 55 in the radial direction of the optical disk. What is necessary is just to arrange so that it may become. Although the present embodiment uses two laser spots, the present invention is not limited to two laser spots. Next, an initialization apparatus for realizing the initialization method by the optical disk rotation scanning will be described with reference to FIG. FIG. 9 is a diagram for explaining an outline of an initialization apparatus for performing optical disk rotation scanning according to still another embodiment. This apparatus uses the initialization unit of FIG. 5 described above with two high-power semiconductor laser arrays. And an optical disk rotation mechanism is added.

The initialization apparatus according to this embodiment includes an initialization section 56 including optical systems such as high-power semiconductor laser arrays 62 and 63, a spindle motor 8 for rotating an optical disk 57, and a spindle motor for controlling the rotation of the spindle motor. The control unit 59 is configured. The initialization unit 56 includes:
The long laser spot 60 irradiated on the recording film 61 is arranged so that the longitudinal direction is perpendicular to the rotation direction of the optical disk, and the short direction is focused on the recording layer of the optical disk,
The spindle motor control section 59 is configured to irradiate a laser beam for a rotation cycle by rotating the optical disk 57 at a predetermined rotation speed. The spindle motor 58 has a surface deflection of ± 100 in the laser optical axis direction.
By holding the optical disk 57 so as to be kept within μm, it is not necessary to perform automatic focus control on the optical disk recording film during initialization.

The laser irradiation time may be equal to or longer than the rotation cycle of the optical disk. The number of rotations of the spindle motor is determined by the intensity distribution in the short direction of the laser spot, the sensitivity of the laser output and the initialization of the recording film. A suitable value is about 50 rpm to 5000 rpm, and the time required for initialization is very short at 1.2 S (= 60/50) even when the rotation speed of the optical disk is 50 rpm.

Further, the intensity distribution of the laser spot is different between the inner and outer circumferences of the optical disc because the initialization apparatus performs initialization while rotating the optical disc. Since there is a possibility that the initialization state difference may occur depending on the circumference, the intensity distribution in the radial direction of the optical disc is changed, the difference between the inner and outer circumferences of initialization is reduced, and uniform initialization over the entire optical disc is obtained. are doing. This laser spot intensity distribution can be easily controlled by changing the output value of each laser array or inserting an optical filter whose transmittance gradually changes in the longitudinal direction of the laser spot between the laser array and the optical disk. Can be achieved.

The initialization apparatus thus configured does not use a mechanism for sending a laser spot in the radial direction of the optical disk or an automatic focusing mechanism as in the conventional apparatus, so that the apparatus mechanism is simplified and initialization is performed at high speed. be able to.

Although the method and apparatus for initializing an optical disk according to each of the above embodiments have been described with respect to an example in which initialization is performed on one surface of an optical disk, the present invention is not limited to this. It is also possible to arrange the initialization sections according to the above-described embodiments on both sides of the optical disc and simultaneously irradiate the recording film with a laser spot to initialize both sides simultaneously and in a short time without inverting the optical disc. it can. Furthermore, the initialization according to the present embodiment
After the recording layer to be initialized is formed, another layer forming process in the film forming apparatus, a disc bonding process,
It may be performed at the same time as the step of applying the protective layer of the ultraviolet curable resin. In addition, the above-mentioned initialization unit or device is installed in the optical disc film forming apparatus or on the transport equipment after the recording layer is formed, and the longitudinal direction of the laser spot is substantially perpendicular to the moving direction of the optical disc, so that the laser spot is positioned on the optical disc recording film surface. Is arranged so as to scan, the initialization can be easily performed without performing the automatic focus control and without providing a special initialization step.

Further, in the above embodiment, a high-power semiconductor laser array was used as a light source. However, the present invention is not limited to this, and the present invention is not limited to initialization of a phase-change optical disk. By adding an external magnetic field generation unit to the initialization apparatus according to the embodiment, an initialization method and apparatus for aligning the magnetization directions of the magneto-optical disk can also be realized.

Note that the present invention can also be represented by the following embodiments.

Embodiment 1 An initialization method for initializing a recording film of an optical disk by moving the disk surface while irradiating the optical disk with a laser beam, comprising one or more lasers irradiating the recording film of the optical disk The moving direction of the spot and the total length or length perpendicular to the moving direction of the spot have at least a length equal to or larger than the outer diameter of the optical disk, and the moving direction of the laser spot is set to the radial direction of the optical disk. Initialization method of optical disk recording film.

<Second Embodiment> An initialization method for initializing a recording film of an optical disk by moving the disk surface while irradiating the optical disk with a laser beam, wherein one or a plurality of lasers irradiating the recording film of the optical disk The moving direction of the spot and the total length or the length in the direction perpendicular to the spot have at least a length equal to or more than the initialization required area width in the radial direction of the optical disk, and the moving direction of the laser spot is defined as the circumferential direction of the optical disk. A method for initializing an optical disk recording film.

Embodiment 3 An initialization apparatus for irradiating a laser beam to an optical disc to initialize a recording film of the optical disc, comprising a light source for emitting a laser beam, output control means for the laser beam, and recording of the optical disc One or more laser spots applied to the film are oval, and the length or the sum of the lengths of the laser spots in the longitudinal direction is at least as long as the width of the area required for initialization in the radial direction of the optical disk. An apparatus for initializing a recording film of an optical disk, comprising:

<Fourth Embodiment> In the initialization apparatus according to the third embodiment, means for condensing a laser beam for irradiating a recording film of an optical disc and a focal position of the condensed laser spot in the short direction are used as a reference. ± 10 in the optical axis direction of the laser light
Means for forming a laser spot having a length (half-width of peak power) of 20 μm or less in a width direction of the laser spot within a range of 0 μm or less.

Fifth Embodiment An initialization apparatus for an optical disk recording film according to the third embodiment, further comprising moving means for moving an optical disk or a laser spot in a radial direction of the optical disk.

Sixth Embodiment An initialization apparatus for an optical disk recording film according to the third embodiment, further comprising means for rotating an optical disk or moving a laser spot in a disk circumferential direction.

<Embodiment 7> The initialization apparatus according to Embodiment 3 is installed in the film forming apparatus after forming the recording layer of the optical disc and in the transport apparatus of the optical disc, and the other layers after the recording layer of the optical disc are formed. A method for initializing a recording layer of an optical disk, wherein the recording layer of the optical disk is initialized during film formation or during transportation of the optical disk.

[0052]

As described above, according to the present invention, a long laser spot having a length equal to or larger than the diameter of an optical disk and having an initialization power is formed by setting the center position of the laser spot near the center position of the optical disk. Is moved in the diameter direction of the optical disk so as to relatively pass therethrough, or a long laser spot having an initializing power having a length equal to or more than the width of the required initialization area in the radial direction of the optical disk and By irradiating while rotating relative to the area required for initialization, the initialization device can be simplified and speeded up. Further, the present invention, by incorporating the simplified initialization device in another manufacturing process, it is possible to initialize within the other manufacturing process time without particularly providing an initialization time, compared with the conventional initialization device Can significantly reduce the initialization time of about 1/50.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a conventional optical disk initialization device.

FIG. 2 is a schematic view of a conventional technique during initialization as viewed from a direction perpendicular to the optical disk surface.

FIG. 3 is a diagram for explaining an initialization method by laser spot linear scanning according to one embodiment of the present invention.

FIG. 4 is a diagram showing a laser spot arrangement according to another embodiment of the present invention.

FIG. 5 is a schematic diagram of an initialization device according to an embodiment of the present invention.

FIG. 6 is a view showing a laser spot intensity distribution on the optical disc recording film according to the embodiment.

FIG. 7 is a schematic diagram of an initialization device by laser spot linear scanning according to the embodiment.

FIG. 8 is a diagram for explaining an initialization method by optical disc rotation scanning according to another embodiment of the present invention.

FIG. 9 is a schematic diagram of an initialization device by optical disk rotation scanning according to another embodiment.

[Explanation of symbols]

12: long laser spot, 13 to 18: small laser spot, 19: total spot length, 21: optical disk, 23: laser spot traveling direction, 28 to 33: laser array, 34: collimator lens, 35: objective lens , 36: half beam splitter, 37: beam monitor, 38: laser output control unit, 40: optical disk, 4
1: Recording layer.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Eiji Sabota Inventor Green Tech Nakai-cho, Nakai-machi, Ashigara-gun, Kanagawa F-term in Hitachi Computer Equipment Co., Ltd. (Reference) 5D090 AA01 BB05 CC11 DD03 DD05 FF08 KK01 KK02 KK10 KK11 LL09 5D119 AA42 AA50 BA01 BB04 CA20 DA08 EB04 EB08 EB13 EC09 EC14 EC18 EC20 EC40 FA05 FA09 JA02 JA11 JA43 JA50 LB03 5D121 AA01 EE28 EE29 GG02 GG26 GG28 JJ08

Claims (8)

[Claims] 1. An initialization method for initializing a recording film of an optical disk by focusing a laser spot on the optical disk, comprising: a long laser spot having a length equal to or longer than the diameter of the optical disk and having an initialization power. And moving the laser spot in the diameter direction of the optical disk such that the center position of the length of the laser spot relatively passes near the center position of the optical disk. 2. An initialization method for initializing a recording film in an initialization required area of an optical disk by focusing a laser spot on the optical disk, wherein the initialization method has a length equal to or greater than the width of the initialization required area of the optical disk. A method for initializing an optical disc, characterized in that a long laser spot having power is irradiated while being relatively rotated. 3. The method according to claim 1, wherein the focal point of the laser spot focused on the optical disc is ± 1 in the optical axis direction of the laser spot.
3. The method for initializing an optical disk according to claim 1, wherein the length (half width of peak power) of the laser spot in the width direction is set to 20 [mu] m or less within a range of 00 [mu] m. 4. An initialization apparatus for initializing a recording film of an optical disk by condensing a laser spot on the optical disk to form a long laser spot having a length greater than the diameter of the optical disk and having an initialization power. An optical disc initialization apparatus, comprising: an initialization unit for performing the operation; and a mechanism for moving the laser spot in the diameter direction of the optical disc such that the center position of the length of the laser spot relatively passes near the center position of the optical disc. 5. An initialization apparatus for initializing a recording film in an initialization required area of an optical disk by converging a laser spot on the optical disk, wherein the initialization power has a length equal to or more than the width of the initialization required area of the optical disk. An initialization unit for forming a long laser spot having the same, and a mechanism for irradiating the long laser spot with respect to an initialization required area of the optical disc while relatively rotating the long laser spot. Optical disk initialization device. 6. The method according to claim 1, wherein the focal point of the laser spot focused on the optical disk is ± 1 in the optical axis direction of the laser sport.
6. The optical disk initialization apparatus according to claim 4, wherein a length (half-width of peak power) of the laser spot in a lateral direction is set to 20 μm or less within a range of 00 μm or less. 7. An optical disk having a length equal to or larger than the diameter of an optical disk in a film forming apparatus after forming a recording film of an optical disk, in a film forming apparatus other than the recording film after forming the recording film, in a bonding apparatus, or in a transporting apparatus. And an initialization unit for forming a long laser spot having an initialization power, wherein the initialization unit is configured to adjust the length of the laser spot so that the center position of the laser spot passes near the center position of the optical disc. A method for initializing an optical disk, comprising: irradiating an entire surface of the optical disk with a long laser spot. 8. An initialization area of an optical disc in a film forming apparatus after forming a recording film of an optical disc, in a film forming apparatus other than the recording film after forming the recording film, in a bonding apparatus, or in a transporting apparatus. An initialization section for forming a long laser spot having a length equal to or greater than the width and having initialization power is provided, and the initialization section rotates the long laser spot over the entire area of the optical disc which requires initialization. A method for initializing an optical disk, which comprises irradiating.