JP4116370B2 - Test optical disc - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a test optical disk, and more particularly, to a test optical disk used for testing reproduction performance against fine scratches generated on a reading surface.
[0002]
[Prior art]
If there is a scratch on the reading surface of the optical disc, the light (laser beam) emitted from the pickup is interfered and irregularly reflected on the reading surface, causing a change in optical / electrical characteristics, and a reproducing / recording device for the optical disc. Signal detection capability, error detection / correction capability, and tracking / focus servo control capability.
[0003]
In order to guarantee the playability of the playback / recording device against these scratches, test optical disks that simulate the scratches have been developed.
Currently, such test optical disks include the following.
(1) As shown in FIG. 6, a plurality of scratches 5 extending in the track direction are formed on the reading surface 3 of the test optical disk 1.
(2) As shown in FIG. 7, a plurality of scratches 15 extending in the track direction are formed on the reading surface 13 of the test optical disk 11.
[0004]
[Problems to be solved by the invention]
However, since the test optical disk 1 of (1) and the test optical disk 11 of (2) have only one scratch direction, only a part of the scratch formed on the actual optical disk is reproduced. There is a problem.
[0005]
The present invention has been made in view of the above problems, issues of that is to provide a test disc which is almost completely reproduce the flaw to be formed when handling an optical disk.
[0007]
[Means for Solving the Problems]
Scratches (scratch scratches) formed on the reading surface of the optical disc are roughly classified into the following three types.
(1) A scratch formed when an optical disc is loaded into a recording / reproducing apparatus or ejected.
[0008]
The scratch in this case is a straight line extending substantially in the radial direction of the optical disk.
(2) Scratches formed when the optical pickup or the like comes into contact with the reading surface of the optical disk while the optical disk is being rotated by the recording / reproducing apparatus.
[0009]
The scratch in this case is a curve extending substantially in the track direction.
(3) Scratches formed when a person handles an optical disc.
The scratches in this case are substantially straight and the extending direction is not constant.
[0010]
The invention according to claim 1 is characterized in that a plurality of third flaws extending in a tangential direction of the track and a plurality of fourth flaws intersecting with the third flaws are provided on the reading surface . It is.
[0015]
According to a second aspect of the present invention, in the test optical disk according to the first aspect , the line width of the third flaw and the line width of the fourth flaw are 30 μm .
[0020]
In the invention described in claims 1 and 2 , scratches provided on the reading surface include a method of forming using a mold and a method of forming by cutting, but are not limited thereto.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
This will be described with reference to FIGS. FIG. 1 is a plan view of a test optical disk according to the first embodiment, and FIG. 2 is an enlarged view of a portion A in FIG.
[0022]
As shown in these figures, the reading surface 23 of the test optical disk 21 extends in the radial direction, has a line width of 30 μm, an angle between scratches of 1 °, and a length from the lead-in start diameter 25 to the program end diameter 27. A pattern of 30 first scratches 29 is formed.
[0023]
Further, in the portion where the first scratch 29 is formed, four or five patterns each including 30 second scratches 31 having an arc shape extending in the track direction and having a line width of 30 μm, a pitch of 100 μm, and a central angle of 30 ° are formed. .
[0024]
According to the test optical disc 21 having such a configuration, when the reading surface 23 is provided with a plurality of fine first scratches 29 extending in the radial direction, the optical disc is loaded into the recording / reproducing apparatus or ejected. In this case, the scratches that are formed are reproduced.
[0025]
In addition, since the reading surface 23 is provided with a plurality of minute second scratches 31 extending in the track direction, the optical pickup or the like contacts the reading surface of the optical disc while the optical disc is being rotated by the recording / reproducing apparatus. Scratches that are formed in the case are reproduced.
[0026]
Therefore, it is possible to reproduce the scratches formed during the operation of the recording / reproducing apparatus almost completely.
In addition, this invention is not limited to the said embodiment, You may form the 1st crack 29 and the 2nd crack 31 in a separate place.
[0027]
Further, different patterns may be formed by changing the length / line width / pitch / number of the first scratch 29 and the second scratch 31.
(Second Embodiment)
This will be described with reference to FIGS. FIG. 3 is a plan view of a test optical disk according to the second embodiment, and FIG. 4 is an enlarged view of a portion B in FIG.
[0028]
As shown in these drawings, the reading surface 53 of the test optical disk 51 intersects with a plurality of fine third scratches 55 extending in a substantially tangential direction of the track and the third scratches 55 (in the present embodiment example). Five sets of patterns composed of a plurality of fine fourth scratches 57 (perpendicular) were provided.
[0029]
The third flaw 55 and the fourth flaw 57 have a line width of 30 μm and a pitch of 100 μm. According to the test optical disc 51 having such a configuration, the reading surface 53 has a plurality of fine third flaws 55 extending substantially in the tangential direction of the track and a plurality of fine fourth flaws 57 intersecting the third flaws 55. The scratches formed when a person handles the optical disc are reproduced.
[0030]
Therefore, scratches formed when handling the optical disc can be reproduced almost completely.
In addition, this invention is not limited to the said embodiment, You may form the 3rd crack 55 and the 4th crack 57 in a separate place.
[0031]
Also, different patterns may be formed by changing the length / line width / pitch / number of third scratches 55 and fourth scratches 57.
(Third embodiment)
This will be described with reference to FIG. FIG. 5 is a plan view of a test optical disk according to the third embodiment.
[0032]
As shown in the figure, the scratch pattern described in the first embodiment is formed on the inner peripheral side of the reading surface 73 of the test optical disc 71. That is, a pattern composed of 30 first scratches 29 extending from the lead-in starting diameter 25 to a substantially intermediate portion in the radial direction of the test optical disk is formed. Further, the portion where the first scratches 29 are formed is formed in the track direction. Extending, two sets of 30 arc-shaped second scratches 31 having a line width of 30 μm, a pitch of 100 μm, and a central angle of 30 ° were formed.
[0033]
The scratch pattern described in the second embodiment is formed on the outer peripheral side of the reading surface 73 of the test optical disk 71. That is, a pattern comprising a plurality of fine third flaws 55 extending in the substantially tangential direction of the track and a plurality of fine fourth flaws 57 intersecting with the third flaws 55 (perpendicular to each other in the present embodiment) 3 Set up.
[0034]
According to the test optical disc 71 having such a configuration, when the reading surface 73 is provided with a plurality of fine first scratches 29 extending in the radial direction, the optical disc is loaded into the recording / reproducing apparatus or ejected. In this case, the scratches that are formed are reproduced.
[0035]
In addition, since the reading surface 73 is provided with a plurality of minute second scratches 31 extending in the track direction, the optical pickup or the like comes into contact with the reading surface of the optical disc while the optical disc is being rotated by the recording / reproducing apparatus. Scratches that are formed in the case are reproduced.
[0036]
Therefore, it is possible to reproduce the scratches formed during the operation of the recording / reproducing apparatus almost completely.
Further, the reading surface 73 is provided with a plurality of fine third flaws 55 extending substantially in the tangential direction of the track and a plurality of fine fourth flaws 57 intersecting with the third flaws 55 so that a person can read the optical disk. Scratches formed when handling are reproduced.
[0037]
Therefore, scratches formed when handling the optical disc can be reproduced almost completely.
As described above, according to the present embodiment, with one test optical disc 71, a scratch formed during the operation of the recording / reproducing apparatus and a scratch formed when the optical disc is handled are almost completely reproduced. can do.
[0038]
In addition, this invention is not limited to the said embodiment, The 1st crack 29 and the 2nd crack 31 may be formed in a separate place, and the 3rd crack 55 and the 4th crack 57 May be formed at different locations.
[0039]
Further, different patterns may be formed by changing the length / line width / pitch / number of the first scratch 29, the second scratch 31, the third scratch 55, and the fourth scratch 57.
Furthermore, in the above embodiment, the pattern composed of the first scratch 29 and the second scratch 31 is formed on the inner peripheral side of the reading surface, and the pattern composed of the third scratch 55 and the fourth scratch 57 is formed on the outer peripheral side. On the contrary, a pattern consisting of the third flaw 55 and the fourth flaw 57 may be formed on the inner peripheral side of the reading surface 73, and a pattern consisting of the first flaw 29 and the second flaw 31 may be formed on the outer peripheral side.
[0040]
【The invention's effect】
As described above, according to the first aspect of the present invention, the reading surface is provided with the plurality of third flaws extending in the tangential direction of the track and the plurality of fourth flaws intersecting with the third flaws. Scratches formed when a person handles an optical disc are reproduced.
Therefore, scratches formed when handling the optical disc can be reproduced almost completely.
[Brief description of the drawings]
FIG. 1 is a plan view of a test optical disc according to a first embodiment.
FIG. 2 is an enlarged view of a portion A in FIG.
FIG. 3 is a plan view of a test optical disc according to a second embodiment.
4 is an enlarged view of a portion B in FIG. 3;
FIG. 5 is a plan view of a test optical disc according to a third embodiment.
FIG. 6 is a diagram for explaining a scratch pattern of a conventional test optical disc.
FIG. 7 is a diagram for explaining a scratch pattern of a conventional test optical disc.
[Explanation of symbols]
21, 51, 71 Test optical disk 23, 53, 73 Reading surface 29 First scratch 31 Second scratch 55 Third scratch 57 Fourth scratch

Claims (2)

On the reading surface,
A plurality of third scratches extending in the tangential direction of the track;
A plurality of fourth scratches intersecting with the third scratch,
A test disk characterized by the provision of 2. The test optical disk according to claim 1 , wherein a line width of the third scratch and a line width of the fourth scratch are 30 [mu] m .

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