JP2776205B2 - Inspection disk and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test disc and a method of manufacturing the same, and more particularly, to a test disc used for testing and adjusting the reproduction performance of a reproducing apparatus to which a disc as a recording medium is mounted. It relates to the manufacturing method.

[0002]

2. Description of the Related Art For example, on a recording surface of a compact disk, various physical factors such as black spots due to foreign matter during molding of the disk, dirt, dust or fingerprints adhering to the disk surface, lack of information layer (pit surface), scratches, etc. Defects can occur. In order to measure the ability of the compact disk player to reproduce such a disk defect, a compact disk player assembled in a factory or the like reproduces the inspection disk provided with the above-described defect in an inspection process and reproduces the disk. Inspection and adjustment of the reproduction ability are performed based on the signal.

[0003] This type of inspection disk is provided with the following defect patterns (defect patterns). Interruption: A defect pattern for simulating a missing information layer (pit surface) and a flaw. Black band: A defect pattern for simulating black spots generated during disk molding and dirt, dust, etc. attached to the disk surface. Fingerprint: A defect pattern for simulating fingerprints attached to the disk surface.

[0004] Usually, a music signal is recorded as a recording signal on a test disk, but some of them record not only a music signal but also a sine wave signal. On such a test disc, a music signal recording track on which a music signal is recorded and a sine wave signal recording track on which a sine wave signal is recorded are alternately formed. When mounted and played continuously, the music signal recording track is played, then the sine wave signal recording track is played, and then the next music signal recording track is played, and so on. The signal recording tracks are alternately reproduced.

The inspector mounts the inspection disk on the assembled compact disk player, and reproduces the reproduced music signal by hearing the defective signal formed on the inspection disk using headphones or the like. To test and adjust their abilities,
Alternatively, the reproduced sine wave signal is electrically measured using a waveform measuring instrument such as an oscilloscope to inspect and adjust the reproduction ability of the compact disk player with respect to a defect pattern formed on the inspection disk.

As described above, when inspecting the reproduction capability of a compact disk player, an inspection disk having the above-described pseudo defect pattern is used. By reproducing the pseudo defect pattern, the compact disk player is inspected. The ability to simulate playback can be simulated. Conventionally, in the process of manufacturing the test disk, first, a stamper for forming an information layer (pit surface) is first manufactured, and the stamper is used as a mold to mold the disk with polycarbonate resin. Then, a defect pattern for forming the above-described interruption is provided in a forming portion of the information layer (pit surface) of the stamper.

[0007] The defect pattern for forming the interruption has been manufactured by forming a scratch on the formed portion of the information layer (pit surface) of the stamper.

[0008]

In order to more accurately perform inspection and circuit adjustment work, the above-mentioned interruption involves randomly forming scratches from all directions in consideration of scratches actually occurring on a disk. It is important that In addition, in order to maintain the uniformity of the inspection accuracy, it is important that the scratches provided in the interruption area are uniform without any unevenness.

[0009] However, conventionally, since the operator manually scratches the surface, there is a problem that the operation is troublesome, the efficiency of the operation is reduced, and the cost is increased. In the case where a scratch is formed manually, a portion having a large number of scratches and a portion having a small number of scratches are generated in an interruption area, resulting in unevenness. on the other hand,
When a scratch is made at a constant pitch in a certain direction by a processing machine, the unevenness of the scratch does not occur, but the scratch can be provided only at the same interval in the same direction. For this reason, even if a processing machine is used, it is not possible to sufficiently reproduce the scratches actually generated on the disk.

Accordingly, an object of the present invention is to provide a test disk which has solved the above-mentioned problems and a method of manufacturing the same.

[0011]

According to the first aspect of the present invention,
In a test disk in which a pseudo-defect portion is formed on a recording surface on which a signal is recorded, the pseudo-defect portion is formed by a set of a plurality of minute unit grooves, and the unit groove is formed as a unit groove .
A plurality of unit groove rows arranged in the first direction are different from the first direction.
It is characterized in that a plurality Dan'yu in a second direction becomes.

Further, the invention of claim 2, Les patterns were assembled a plurality of micro Naru units groove to correspond to the pseudo-defective portion on the stamper for molding a disk having a recording surface
Formed by a laser processing machine that irradiates laser light intermittently ,
After forming the pseudo defect on the recording surface by the stamper, a reflective film coated on the recording surface, then characterized by comprising by bonding a protective film on the surface of the reflective film Monodea
You.

[0013] Further , the invention of claim 3 provides the above-mentioned claim 1.
The inspection disk, wherein the plurality of unit groove rows,
Characterized in that they are respectively displaced in the first direction.
Things. The invention according to claim 4 is the invention according to claim 1.
A test disk, wherein the plurality of minute unit grooves
Set so that the edges of adjacent unit grooves overlap each other
Is characterized by being arranged in a.

[0014]

According to the first aspect of the present invention, a pseudo defective portion is provided.
Are formed by a set of a plurality of minute unit grooves, and the unit grooves
Are unit grooves arranged in the first direction and the first direction.
Has a plurality of stages in different second directions, so that
It is possible to a scratch wound and the second direction is provided a wound randomly from all directions on the assumption wounds they actually occur on the formed simultaneously disk, uneven scars interruptions region Therefore, uniformity of inspection accuracy can be maintained.

According to the second aspect of the present invention, a disk
A plurality of minute unit grooves on a stamper for molding
Laser processing machine that irradiates a laser beam intermittently with a patterned pattern
Laser-irradiated part
Are deformed into different shapes by thermal deformation. to this
As a result, it is possible to randomly create scratches in all directions assuming scratches actually occurring on the disk, and it is possible to efficiently process the scratches. In addition, it is possible to prevent the occurrence of flaw unevenness such as generation of a part having a large amount of flaws and a part having a small number of flaws in an interruption area.

According to the third aspect of the present invention, a plurality of units are provided.
Since the alignment groove rows are respectively displaced in the first direction,
Overlap between unit grooves that are staggered in one direction
The portion is also formed so as to be shifted in the first direction. to this
More, assuming the actual scratches on the disc
Flaws can be randomly formed from the same direction. Only
Even with the heavily scratched area in the area of interruption
Uneven scratches, such as the formation of small scratches, may occur.
And can be prevented.

According to the fourth aspect of the present invention, an adjacent unit
Since the edges of the groove are arranged so as to overlap each other,
The overlap between each unit groove is different from the non-overlap
Pattern is formed. This allows the
From all directions, assuming actual scratches
The system can be scratched. Moreover, the interruption
Between the heavily scratched and less scratched areas
It is possible to prevent the occurrence of flaw non-uniformity such as occurrence of flaws.

[0018]

1 to 3 show an embodiment of an inspection disk according to the present invention. In each drawing, the inspection disc 1 is used by being mounted at a predetermined reproduction position of the compact disk player when inspecting the reproduction capability of a compact disk player (not shown). The inspection disc 1 is manufactured in the same size as a generally used compact disc. The upper surface is an information reading surface 1a, and the lower surface is a title printing surface 1b on which a title is printed. In the inspection disk 1, a reflective film 1d formed by evaporating aluminum is formed on the lower surface of a polycarbonate resin disk 1c on the recording surface 1e, and a synthetic resin protective film 1f is formed on the lower surface of the recording surface 1e.
Are joined.

On the recording surface 1e of the inspection disk 1, a circle formed at a substantially intermediate position in the radial direction is defined as a boundary line 2.
A first area 3 provided with a plurality of music signal recording tracks is formed inside the boundary 2, and a second area 4 provided with a plurality of sine wave signal recording tracks is formed outside the boundary 2. . In the first area 3, for example, 13 different pieces of classical music (address numbers 1 to 13) are recorded for 1 minute and 30 seconds. In the second area 4, sine wave signal recording tracks are formed at address numbers 14 to 43, and for example, sine wave signals of 1 KHz and 10 KHz are alternately recorded on the recording tracks of address numbers 14 to 43 for 30 seconds. It is recorded in.

Further, the reading surfaces 1a,
A defect pattern (defect pattern) 5 as a pseudo defect is formed on the recording surface 1e. The defect pattern 5 extends in the radial direction so as to intersect the recording tracks recorded in the first area 3 and the second area 4, and is formed for each area. In the defect pattern 5, an interruption 6, a black band 7, and a fingerprint 8 are sequentially formed from the inside to the outside in the first region 3, and the interruption 6 'from the inside to the outside in the second region 4. , A black band 7 ′, and a fingerprint 8 ′ are sequentially formed.

The interruption 6 is a defect pattern for simulating a lack of the information layer (pit surface) and a flaw in the first area 3 formed on the recording surface 1e, and a damage pattern on the information layer (pit surface). To crush the uneven pattern. The black band 7 is a defect pattern for simulating black spots formed in the first area 3 when the disc is formed and dirt, dust and the like attached to the disc surface, and a black coating is formed on the reading surface 1a of the test disc 1. Printed.

The fingerprint 8 is a defect pattern for simulating a fingerprint attached to the disk surface in the first area 3, and a black coating is printed on the reading surface 1 a of the inspection disk 1 in the same manner as the black band 7. ing. Therefore, a first area 3 on which a music signal is recorded is formed on the inner side including the recording track overlapping with the fingerprint 8 printed at the intermediate position of the reading surface 1a,
A sine wave signal is recorded on the outside.

The interruption 6 formed in the first area 3 is provided at a position intersecting the music signal recording tracks of the address numbers 2 to 7, and has the same width in the circumferential direction at the same address number. Equally, the shape gradually increases as the address number increases. That is, the width of the interruption 6 in the circumferential direction increases stepwise as it moves from the inside to the outside.

The black band 7 formed in the first region 3 has substantially the same shape as that of the above-mentioned interruption 6,
It is provided at a position that intersects with the music signal recording tracks of address numbers 8 to 12. Therefore, black band 7
Has the same width in the circumferential direction at the same address number, and gradually increases as the address number increases.

The fingerprint 8 formed in the first area 3 is provided at a position that intersects the music signal recording track of address number 13. The width of the fingerprint 8 in the circumferential direction is constant. Next, the interruption 6 'formed in the second area 4 is provided at a position intersecting the sine wave signal recording tracks of the address numbers 16 to 29, and the width dimension in the circumferential direction is equal to one even number. The shape is the same as the next odd number, and gradually increases as the address number increases (that is, each even number).

The black band 7 'formed in the second area 4 has substantially the same shape as that of the interruption 6', and is provided at a position crossing the sine wave signal recording tracks of the address numbers 30 to 41. I have. Accordingly, the black band 7 'has a shape in which the width in the circumferential direction is gradually increased for each even number. The fingerprint 8 ′ formed in the second area 4 is provided at a position that intersects the sine wave signal recording tracks of the address numbers 42 to 43. The width of the fingerprint 8 'in the circumferential direction is constant.

In a factory where a compact disk player is assembled, the inspection disk 1 is mounted on the compact disk player that has been assembled in the inspection process, and the reproduction performance is inspected and adjusted. At that time, the inspector checks the sound skipping state due to a defect in the reproduced signal by hearing. In this case, the music signal recorded in the first area 3 of the test disk 1 is reproduced by designating an arbitrary number from among the address numbers 2 to 13, and the reproduced sound is heard by headphones or the like. Adjust the sensitivity of the circuit to be removed or check for any track shift.

In the case of electrically measuring using a waveform measuring instrument, an arbitrary number is selected from the address numbers 16 to 43 of the sine wave signal recorded in the second area 4 of the test disk 1. Is specified, and the change of the reproduction signal waveform is checked. As described above, since the first area 3 of the music signal and the second area 4 of the sine wave signal are recorded separately inside and outside the boundary line 2 on the inspection disk 1, the inspection disk 1 When the playback capability of the compact disc player is tested using the first audio signal 1, the auditory inspection or the waveform measuring instrument is used by designating the address number of the first area 3 of the music signal or the second area 4 of the sine wave signal. It can easily cope with the inspection using.

Moreover, the first area 3 and the second area 4
Since the interruptions 6, 6 ', the black bands 7, 7', and the fingerprints 8, 8 'are formed independently of each other, the auditory inspection and the reproduction signal waveform inspection can be performed independently. For example, there is no inconvenience that a sine wave signal is suddenly reproduced during the auditory inspection and a harsh reproduction sound is heard as before, and the inspection work is performed while feeling uncomfortable every time the harsh reproduction sound is heard. , It is possible to eliminate the disadvantage that the work efficiency is reduced. Therefore, when performing an auditory test, it is possible to prevent a harsh reproduction sound from being heard, and to prevent a sine wave signal from being reproduced during an auditory test as in a conventional test disc. This eliminates the need for troublesome track designation operations, and enables efficient inspection.

The patterns of the interruptions 6, 6 'and the black bands 7, 7' have a shape in which the width in the circumferential direction is increased stepwise, and the switching position of the width is located between music pieces. It is provided in. Therefore, since the circumferential width of the defect pattern is constant within the same music,
The defect pattern can be checked at the same width in the circumferential direction anywhere in the same music, and the defect pattern of each width can be checked step by step without specifying the recording track position.

FIG. 4 shows the configuration of a laser processing machine 9 for processing a defect pattern corresponding to the interruptions 6, 6 'on a stamper for molding the inspection disk 1. As shown in FIG. In the figure, a laser processing machine 9 includes a work storage room 10,
It comprises a laser unit 11 and a control device 12. A work (a stamper in this embodiment) is provided in the work storage room 10.
Vacuum type clamper 13 for clamping the XY table 14, an XY table 14 for supporting the clamper 13,
Lifting mechanism 15 for lifting and lowering the XY table 4 and the XY table 14
Moving mechanism 1 for moving the robot horizontally together with the elevating mechanism 15
6 and a CCD camera 17 for checking the work reference position.

The clamper 13 is connected to an external vacuum device 19 via a tube 18. During processing, the inside of the clamper 13 is evacuated to suck and hold a work placed on the upper surface of the clamper 13. The laser unit 11 is mounted on the upper part of the work storage chamber 10 and holds a laser beam on the clamper 13 from an emission port 11a via an internal lens, mirror (not shown) or prism (not shown). Irradiate the work. Also, the laser unit 11
A slit plate 11b for regulating the irradiation pattern of the laser beam can be mounted on the upper part. Therefore, the laser unit 11 can be changed to an arbitrary irradiation pattern by exchanging the slit plate 11b.

The control device 12 is provided with a display 20 for displaying an image picked up by the CCD camera 17, a display 21 for displaying a program, operation keys 22 and the like. When the control device 12 operates the elevating mechanism 15 and the horizontal moving mechanism 16 and confirms that the work position on the clamper 13 has been adjusted to the reference position by the CCD camera 17, the laser device will be described later. XY table 1 while emitting laser light from unit 11
4 is driven to change the work position.

FIG. 5 is a view showing an irradiation pattern emitted from the laser beam machine 9. FIG. 6 is a view showing a pattern processed by the laser processing machine 9. The laser beam irradiation pattern 23 is determined by the slit shape of the above-described slit plate 11b. In the present embodiment, as shown in FIG. 5, the short side is 20 μm and the long side is 178 μm, which is extremely small. Then, the irradiation pattern 23 irradiated with the laser light forms a dent that becomes a unit groove when processing a stamper described later. The aggregate of the unit grooves serves as a forming portion for forming the interruptions 6, 6 '.

[0035] Then, when processing on the stamper described later molding portion for molding the interruptions 6,6 ', as shown in FIG. 6, the laser beam irradiated portion 23a ₁ ~
23a _n is shifted irradiation pattern 23 so as to be continuous to the outside of the disc (the long side direction of the irradiation pattern 23). At that time, shifting the irradiation pattern 23 as edges adjacent the laser beam irradiated portion 23a ₁ ~23a _n overlap each other.
When the irradiation of the laser beam to the laser beam irradiation portions 23a _{1 to} 23an in the a- _th row is completed, the irradiation pattern 23 is shifted in the circumferential direction (the short side direction of the irradiation pattern 23), and the b-th laser light irradiation portion 23b _A laser beam is applied to _{1 to} 23b _n . Incidentally, the laser beam irradiation portions 23b _{1 to} 23b _{n in the} b-th row
When irradiating the laser beam, the irradiation pattern 23 is shifted toward the inside of the disk (in the direction opposite to the row a).

At this time, the laser beam irradiation portion 23b _{1 in the} b-th row
～23B _n shifted irradiation pattern 23 to overlap each other with the edge of the laser beam irradiated portion 23a ₁ ~23a _n long side of the edge adjacent a column of. In this manner, by irradiating the laser beam after the row c in the same manner as the rows a and b, an irradiation pattern of an arbitrary shape is formed by a set of a plurality of laser light irradiation portions. The movement control of the irradiation position of the laser light as described above is automatically performed because a program is input to the control device 12 in advance.

In the portion irradiated with the laser beam as described above, thermal deformation occurs and the portion is slightly dented. for that reason,
In a portion of the portion irradiated with the laser light that overlaps with the adjacent pattern, the laser light is irradiated twice, and a different thermal deformation occurs from the other portions. Therefore, a random concavo-convex portion is formed at the edge of each laser beam irradiation portion.

Therefore, the stamper for molding the disc is
Laser light is applied to a pattern in which a small number of unit grooves are assembled.
It can be formed by a laser processing machine that irradiates intermittently.
Therefore, each part irradiated with the laser beam is different due to thermal deformation.
Shape. This allows the actual
Scratches randomly from all directions assuming scratches
And can be processed efficiently
Can be.

That is, interruptions 6, 6 '(question
(Similar defect) is formed by aggregation of multiple minute unit grooves
And a plurality of unit grooves are provided in the first direction (disc radial direction).
A second direction different from the first direction is the aligned unit groove row.
Since there are a plurality of stages in the (track direction), scratches in the first direction
And a scratch in the second direction are formed at the same time.
Randomly from all directions assuming scratches that occur at the time
Wounds can be provided.

Next, a method of manufacturing the inspection disk 1 will be described with reference to FIG. Step 1: First, the surface of the glass plate 25 is polished well. Step 2: A photoresist 26 is applied to the surface of the glass plate 25. Step 3: The photoresist 26 is irradiated with a laser beam to record an uneven pattern corresponding to the information layer (pit surface). Step 4: A developing process is performed to remove the photoresist 26a in the portion irradiated with the laser beam. Step 5: Photoresist 2 left on the surface of the glass plate 25
6b is coated with copper plating 27 so that the disk master 2
Create 8. Step 6: metal master 2 based on disk master 28
9 is created. Step 7: Mother disk 3 based on metal master 29
Create 0. Step 8: The stamper 31 is created based on the mother disk 30. Step 9: The laser beam machine 9 (see FIG. 4) sequentially irradiates a plurality of rows of laser light irradiated portions on the stamper 31 with laser light as shown in FIG. By irradiating the stamper 31 with a laser beam, a forming portion for forming the interruptions 6 and 6 'is formed in the first region 3 of the music signal and the second region 4 of the sine wave signal. Step 10: The disk 1c (see FIG. 3) is formed by injection molding using polycarbonate resin using the stamper 31. Step 11: A reflective film 1d in which aluminum is deposited on the lower surface of the disk 1c is formed on the recording surface 1e. Step 12: Protective film 1f made of synthetic resin on the lower surface of recording surface 1e
To join.

Thus, the inspection disk 1 is completed. Then, the laser beam is radiated to the stamper 31 by the laser processing machine 9 as described above, and the interruptions 6 and 6 are applied to the first area 3 of the music signal and the second area 4 of the sine wave signal.
Since a molded portion for molding 6 ′ is formed, interruptions 6 and 6 ′, which are a set of random scratches, are formed on the recording surface 1e of the disk 1c.

FIG. 8 is an enlarged view of the interruption 6 formed in the first area 3 of the music signal. (However, FIG. 8B is an enlarged view of FIG. 8A, and FIG. 8C is an enlarged view of FIG. 8B.) FIG. 9 is an enlarged view of the interruption 6 ′ formed in the second area 4 of the sine wave signal. (However, FIG. 9A is an enlarged view of FIG. 9A.
9B is an enlarged view of FIG. 9B in FIG. 9B.)

Therefore, in the interruptions 6 and 6 ', a uniform scratch C is formed as a whole as shown in FIGS. 8A and 9A, and ) And FIG.
(B) As shown in (C), when further enlarged, random scratches are formed at regular intervals. That is, in the interruptions 6 and 6 ', the scratches C are randomly provided from all directions assuming the scratches actually occurring on the disk, so that the inspection and the circuit adjustment work can be performed more accurately. it can. In addition, since the scratches provided in the areas of the interruptions 6 and 6 'are uniform without any unevenness, the uniformity of the inspection accuracy can be maintained.

In the above embodiment, the inspection disk for inspecting the reproduction capability of the compact disk player is described as an example. However, the present invention is not limited to this, and the reproduction capability of a magneto-optical disk device using an optical pickup is inspected. Of course, the present invention can be applied to an inspection disk. Further, in the above embodiment, the first area 3 of the music signal and the second area 4 of the sine wave signal are formed on one inspection disc, but the present invention is not limited to this. The region 4 may be shifted in the radial direction.

Instead of recording a music signal in the first area 3, a silent band may be formed, and noise at the time of reproducing a defective pattern may be checked by hearing. Instead of recording the sine wave signal in the second area 4, a random noise pattern that is not regularized may be formed and the waveform of the reproduced signal may be checked.

[0046]

As described above, according to the first aspect of the present invention, the pseudo defect portion is formed by a set of a plurality of minute unit grooves.
A unit groove formed and a plurality of unit grooves arranged in a first direction
A plurality of rows in a second direction different from the first direction;
Therefore, the flaw in the first direction and the flaw in the second direction are simultaneously formed.
Scratches can be randomly formed from all directions in anticipation of scratches actually occurring on the disc, and the scratches in the interruption area can be formed uniformly without unevenness. Uniformity can be maintained.

According to the second aspect of the present invention, the disk
A plurality of minute unit grooves on a stamper for molding
Laser processing machine that irradiates a laser beam intermittently with a patterned pattern
Laser-irradiated part
Are deformed into different shapes by thermal deformation. to this
As a result, it is possible to randomly create scratches in all directions assuming scratches actually occurring on the disk, and it is possible to efficiently process the scratches. In addition, it is possible to prevent the occurrence of flaw unevenness such as generation of a part having a large amount of flaws and a part having a small number of flaws in an interruption area.

According to the third aspect of the present invention, a plurality of unit
Since the alignment groove rows are respectively displaced in the first direction,
Overlap between unit grooves that are staggered in one direction
The portion is also formed so as to be shifted in the first direction. to this
More, assuming the actual scratches on the disc
Flaws can be randomly formed from the same direction. Only
Even with the heavily scratched area in the area of interruption
Rutoitta scratches unevenness generated child occurs and the portion of a small wound
And can be prevented.

According to the fourth aspect of the present invention, an adjacent unit
Since the edges of the groove are arranged so as to overlap each other,
The overlap between each unit groove is different from the non-overlap
Pattern is formed. This allows the
From all directions, assuming actual scratches
The system can be scratched. Moreover, the interruption
Between the heavily scratched and less scratched areas
It is possible to prevent the occurrence of flaw non-uniformity such as occurrence of flaws.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a test disk according to the present invention.

FIG. 2 is an enlarged plan view showing a defect pattern formed on an inspection disk.

FIG. 3 is an enlarged longitudinal sectional view showing an inspection disk.

FIG. 4 is a configuration diagram for explaining a schematic configuration of a laser processing machine.

FIG. 5 is an enlarged view showing an irradiation pattern emitted from a laser beam machine.

FIG. 6 is a diagram showing a pattern processed by a laser processing machine.

FIG. 7 is a process chart for explaining a method of manufacturing the inspection disk.

FIG. 8 is an enlarged view of an interruption formed in a first area of a music signal.

FIG. 9 is an enlarged view showing an interruption formed in a second area of the sine wave signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inspection disk 2 Boundary line 3 1st area 4 2nd area 5 Defect pattern 6, 6 'Interruption 7, 7' Black band 8, 8 'Fingerprint 9 Laser processing machine 10 Work storage room 11 Laser unit 12 Control device 23 Irradiation pattern 31 Stamper

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 7/26 G11B 7/007

Claims (4)

(57) [Claims] 1. An inspection disk in which a pseudo defect portion is formed on a recording surface on which a signal is recorded, wherein the pseudo defect portion is formed by a set of a plurality of minute unit grooves. There inspection disk, wherein a plurality of stages <br/> Yes in a second direction different from the multiple ordered units groove array in a first direction the first direction. 2. A laser beam is intermittently irradiated with a pattern in which a plurality of minute unit grooves are gathered to correspond to a pseudo defect portion on a stamper for molding a disk having a recording surface .
That is formed by a laser processing machine, after forming a pseudo defective portion on the recording surface by the stamper, a reflective film coated on the recording surface, by being formed then by bonding the protective film on the surface of the reflective film A method of manufacturing a test disk, which is characterized by 3. The inspection disc according to claim 1, wherein
Therefore , the plurality of unit groove rows are respectively displaced in the first direction.
An inspection disc characterized by being performed. 4. The inspection disc according to claim 1, wherein
Thus, the set of the plurality of minute unit grooves is formed at an edge of an adjacent unit groove.
Are arranged so as to overlap each other.
Inspection disk.