JPH0589530A - Optical recording disk and its appearance inspection method - Google Patents

Abstract

PURPOSE:To securely measure the size of a defect on the entire surface of an optical recording disk and its absolute position in radial and circumferential directions. CONSTITUTION:An appearance inspection start position mark is recorded at a section other than a program area of an optical recording disk main unit, a picture element for program area detection and a picture element for appearance inspection start position mark detection are provided, and the optical recording disk main unit is rotated. The appearance inspection start position mark is detected with the element for appearance inspection start position mark detection, the position of the disk main unit in the circumferential direction is recognized from the detected picture element of a CCD line sensor, and the disk main unit is rotated once from the position where the appearance inspection start position mark was detected. Thus, based on the obtained information of the picture element for program area detection, the size of the defect of the entire surface of the optical recording disk and its absolute position in the radial and circumferential directions are measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an optical recording disc (CD, CD-ROM, CD-I, laser disc,
Write-once and rewritable discs, magneto-optical discs, etc.)
More particularly, the present invention relates to an optical recording disk capable of surely measuring the absolute position of a defect in the circumferential direction at the time of visual inspection and a visual inspection method thereof.

[0002]

2. Description of the Related Art Optical recording has advantages over magnetic recording in that a recording medium and a head are not in contact with each other and high-density recording is possible. As this optical recording medium, a read-only type, a writable type, and an erasable and rewritable type are known.

As a read-only optical recording medium according to the present invention, an optical recording disk (CD,
CD-ROMs, CD-Is, laser disks, write-once and rewritable disks, magneto-optical disks, etc., and optical cards (ROM-type cards, write-once and rewritable cards, magneto-optical cards, etc.) The shape has been put to practical use.

On the other hand, as an optical recording medium of this kind,
For example, it has been manufactured by the following method. That is, a photosensitive resin layer (resist layer) is formed on the glass substrate.
And a conductive film layer are formed, an electroformed layer is formed on the conductive film layer, the glass substrate and the electroformed layer are separated, washed and dried, a protective layer is coated, and the back surface is polished. It is made into a product by punching.

By the way, the detection of defects such as scratches and dust (hereinafter referred to as appearance inspection) on such an optical recording medium, particularly an optical recording disk, is conventionally performed by an appearance inspection apparatus as shown in FIG. 4, for example. Is coming.

That is, in FIG. 4, the light from the halogen lamp 1 is applied to the program area of the optical recording disk 6 to be inspected through the pinhole 2, the mirror 3, the cylindrical lens 4, and the half mirror 5. , The reflected light is passed through the half mirror 5 and the coupling lens 7 to C
The CD line sensor 8 is configured to receive light, and the optical recording disk 6 is rotated once to obtain defect information on the entire surface of the optical recording disk 6.

In this case, as defects such as scratches and dust, those having a diameter of about 20 to 30 μm can be detected. Further, the time required for inspection is about 5 seconds per sheet, and the time required for one rotation is 2 to 3 seconds. Further, the message for the detected defect is R (distance from the center of the disk), θ (rotation angle), and b (the number of bits where the light amount has changed).

However, in the usual case, the optical recording disc to be inserted into this type of appearance inspection apparatus is a molding machine,
Since it passes through the vapor deposition machine and the protective film spinner, its circumferential position is not constant, and it is impossible to measure the absolute circumferential position of the defect.

That is, in many optical recording discs, as shown in FIG. 5, there are stamps (ID numbers, etc.) 10 on the inner peripheral portion of the program area 9, but the number of characters, character spacing, number of characters, size, etc. However, it is difficult to use this as the visual inspection start position mark.

Therefore, since the visual inspection start position is unknown, the θ (rotation angle) obtained as described above has no meaning.

[0011]

As described above, in the conventional optical recording disk appearance inspection method, it is impossible to measure the absolute position in the circumferential direction of the defect of the optical recording disk. There was a problem.

The present invention has been made to solve the above-mentioned problems, and at the time of visual inspection, the size of defects on the entire surface of an optical recording disk and the absolute positions in the radial direction and the circumferential direction can be assured. It is an object of the present invention to provide an extremely reliable optical recording disk that can be measured at any time and its appearance inspection method.

[0013]

To achieve the above object, in the present invention, an appearance inspection start position mark (or appearance inspection start position groove) is recorded in a portion other than the program area of the optical recording disk body. , When performing a visual inspection of an optical recording disk by using a CCD line sensor, a pixel for a program area defect detection pixel and a pixel for visual inspection start position mark detection (or a pixel for visual inspection start position groove detection) as a pixel of the CCD line sensor , And rotate the optical recording disk body,
The visual inspection start position mark (or the visual inspection start position groove) is detected by the visual inspection start position mark detection pixel (or the visual inspection start position groove detection pixel) of the CD line sensor, and the detected CCD line sensor pixel position Of the CCD line sensor, which is obtained by recognizing the circumferential position of the optical recording disk main body from the position of the optical recording disk main body and detecting the visual inspection start position mark (or the visual inspection start position groove) and rotating the optical recording disk main body once from there. Based on the information of the program area defect detection pixel, the size of the defect on the entire surface of the optical recording disk main body,
The absolute position in the radial direction and the circumferential direction are measured.

Here, in particular, a plurality of visual inspection start position marks are recorded at different positions in the radial direction of the optical recording disk body and at different angular positions in the circumferential direction. Further, a plurality of visual inspection start position marks are recorded on the spiral position. Further, regarding the different angular positions in the circumferential direction, the angles between the respective visual inspection start position marks are made substantially equal.

Furthermore, the appearance inspection start position groove is continuously recorded in a spiral shape.

[0016]

Therefore, in the optical recording disk and the appearance inspection method thereof of the present invention, the absolute position in the circumferential direction of the defect of the optical recording disk can be measured by recognizing the start position of the appearance inspection during the appearance inspection. It becomes possible to do. As a result, the size of the defect on the entire surface of the optical recording disk and the absolute positions in the radial direction and the circumferential direction can be reliably measured.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view showing a structural example of a CD which is an optical recording disk according to the present invention. That is, the CD of this embodiment is the program area 12 of the CD body 11.
A plurality of (four in this example, A, B, C, and D) visual inspection start position marks 13 are provided on the other portion (in this example, the inner peripheral portion of the program area 12) of the radius of the CD body 11. Recording is performed on the spiral position at different positions in the direction and at different angular positions in the circumferential direction.

Here, regarding the different angular positions in the circumferential direction of the visual inspection start position marks 13, the angles between the visual inspection start position marks 13 are substantially equal to each other (90 degrees in this example). I am trying to do it. Further, the appearance inspection start position mark 13 may be recorded at the same time as the program at the time of manufacturing the glass master, or may be recorded by a laser marker or the like after manufacturing the stamper. In this example, the size of the mark 13 is 100 μ, which is about three times as large as the pixel of the CCD line sensor, in consideration of the CD centering position error.
m □ The size of the mark 13 is determined by the accuracy of the CD and the appearance inspection device.

FIG. 2 shows a CC of a visual inspection apparatus according to the present invention.
It is a figure which shows the structural example of the pixel of a D line sensor. The other elements are the same as those in FIG. 4 described above.
That is, the pixels of the CCD line sensor 14 include a large number of program area defect detection pixels 15 and the four appearance inspection start position marks 13 (A, B, C, D).
Of four visual inspection start position mark detection pixels 16A, 16B, 16C and 16D respectively provided corresponding to

Next, a method of inspecting the appearance of the CD body 11 according to this embodiment having the above-mentioned structure will be described.

When performing the visual inspection of the CD 11, the CD main body 11 is first rotated to detect the visual inspection start position mark detection pixel (16) of the CCD line sensor 14.
A, 16B, 16C, or 16D) detects the corresponding visual inspection start position mark 13 (A, B, C, or D), and from the detected pixel position of the CCD line sensor 14, the CD The circumferential position of the main body 11 is recognized.

Next, after the appearance inspection start position mark 13 is detected, the CD main body 11 is rotated once from the detected position, and based on the information of the program area defect detecting pixel 15 of the CCD line sensor 14 obtained by this. Then, the size b of the defect on the entire surface of the CD body 11, the absolute position R in the radial direction and the absolute position θ in the circumferential direction are measured.

As described above, the CD of this embodiment is a CD
Four appearance inspection start position marks (four A, B, C, D) 13 on the inner periphery of the program area 12 of the main body 11.
Are recorded on the spiral position at different positions in the radial direction of the CD body 11 and at different angular positions in the circumferential direction, and C
When performing a visual inspection of D11, first, the CD body 11
Are rotated to detect pixels (16A, 16B, 16C, 1) for appearance inspection start position mark detection of the CCD line sensor 14.
6D), the corresponding visual inspection start position mark 13 (any one of A, B, C, D) is detected, and C is detected from the detected pixel position of the CCD line sensor 14.
After recognizing the circumferential position of the D main body 11 and detecting the appearance inspection start position mark 13, the CD is detected from the detected position.
Based on the information of the program area defect detection pixel 15 of the CCD line sensor 14 obtained by rotating the main body 11 once, the defect size b on the entire surface of the CD main body 11, the absolute position R in the radial direction and the circumferential direction R The absolute position θ is measured.

Therefore, the following effects can be obtained.

(A) When the appearance of the CD body 11 is inspected, the size of the defect and the absolute positions in the circumferential direction and the radial direction can be reliably measured.

(B) Since the visual inspection start position mark 13 is recorded at the same time as the program at the time of manufacturing the glass master disk or at the time of manufacturing the stamper with a laser marker, there is almost no need to change or add the conventional process. I'm done.

(C) The appearance inspection start position mark 13 is C
Since four pieces are recorded on the spiral position at different positions in the radial direction of the D main body 11 and at different angular positions in the circumferential direction, at the time of the appearance inspection of the CD main body 11, the defect size and the It is possible to measure the absolute position in the circumferential direction and the radial direction extremely quickly.

Next, another embodiment of the present invention will be described.

FIG. 3 is a plan view showing another structural example of a CD which is an optical recording disk according to the present invention. That is, in the CD of this embodiment, the appearance inspection start position groove 17 is continuously recorded in a spiral shape in a portion other than the program area 12 of the CD body 11 (in this example, the inner peripheral portion of the program area 12). It is the one. That is,
This embodiment is similar to the case where an infinite number of the appearance inspection start position marks 13 described above are recorded.

As the pixels of the CCD line sensor, the four appearance inspection start position mark detection pixels (16A, 16B,
16C, 16D), one appearance inspection start position groove detection pixel is provided.

Next, a method of inspecting the appearance of the CD body 11 according to this embodiment having the above-mentioned structure will be described.

When performing the visual inspection of the CD 11, the CD main body 11 is first rotated, and the visual inspection start position groove 17 is detected by the pixel for detecting the visual inspection start position groove of the CCD line sensor 14. The position in the circumferential direction of the CD body 11 is recognized from the detected pixel position of the CCD line sensor 14.

Next, the appearance inspection start position groove 17
After detecting, the CD main body 11 is rotated once from the detected position, and the CCD line sensor 1 obtained by this
Based on the information of the program area defect detection pixel 15 of No. 4, the defect size b on the entire surface of the CD main body 11, the absolute position R in the radial direction and the absolute position θ in the circumferential direction are measured.

Therefore, in this embodiment as well, the same effect as described above can be obtained, and the appearance inspection start position groove 17 is spirally continuously formed on the inner peripheral portion of the program area 12 of the CD body 11. Since the recording is performed on the CD main body 11, it is possible to shorten the time required to detect the groove during the visual inspection of the CD body 11, and to measure the size of the defect and the absolute position in the circumferential and radial directions. Can be performed more quickly.

In each of the above embodiments, the case where the present invention is applied to a CD which is an optical recording disk has been described, but the present invention is not limited to this, and the same effects can be obtained by applying the present invention in exactly the same manner. Is what you can get.

In the embodiment shown in FIG. 1, the case where four appearance inspection start marks 13 are recorded has been described.
Not limited to this, it is sufficient to record at least one appearance inspection start mark 13, and the more the number thereof is increased, the shorter the time until the mark detection can be performed. It becomes possible to carry out the process more quickly.

Further, in the embodiment of FIG. 1 described above, the case where the appearance inspection start mark 13 is recorded on the spiral position is not limited to this, but at different positions in the radial direction of the optical recording disk main body, and It suffices to record a plurality of data at different angular positions in the circumferential direction.

Furthermore, in each of the above embodiments, the case where the visual inspection start position mark or groove is recorded on the inner peripheral portion of the program area 12 of the CD body 11 has been described, but the invention is not limited to this, and the program area of the CD body 11 is not limited to this. Any portion other than 12 may be recorded with the visual inspection start position mark or groove.

[0040]

As described above, according to the present invention, the visual inspection start position mark (or the visual inspection start position groove) is recorded in a portion other than the program area of the optical recording disc main body, and the optical recording disc is recorded. When using the CCD line sensor for visual inspection of the
A pixel for detecting a program area defect and a pixel for detecting a visual inspection start position mark (or a pixel for detecting a visual inspection start position groove) are provided as pixels of the line sensor, and the optical recording disk body is rotated to inspect the visual appearance of the CCD line sensor. The start position mark detection pixel (or the appearance inspection start position groove detection pixel) detects the appearance inspection start position mark (or the appearance inspection start position groove), and the optical recording disk body is detected from the detected pixel position of the CCD line sensor. The pixel for detecting the program area defect of the CCD line sensor, which is obtained by recognizing the position in the circumferential direction of the optical disc, detecting the visual inspection start position mark (or the visual inspection start position groove), and then rotating the optical recording disk main body once from there. The entire surface of the optical recording disc body based on the information in Since the size of the defect and the absolute position in the radial direction and the circumferential direction are measured, the size of the defect on the entire surface of the optical recording disk and the absolute position in the radial direction and the circumferential direction can be checked during the visual inspection. It is possible to provide an extremely reliable optical recording disk that can be reliably measured and an appearance inspection method thereof.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a CD which is an optical recording disk according to the present invention.

FIG. 2 is a diagram showing a pixel configuration example of a CCD line sensor of an appearance inspection device according to the present invention.

FIG. 3 is a plan view showing another embodiment of a CD which is an optical recording disk according to the present invention.

FIG. 4 is a schematic diagram showing a configuration example of an appearance inspection device.

FIG. 5 is a plan view for explaining a problem caused by a conventional appearance inspection method.

[Explanation of symbols]

1 ... Halogen lamp, 2 ... Pinhole, 3 ... Mirror, 4
... Cylindrical lens, 5 ... Half mirror, 6 ... Optical recording disk, 7 ... Coupling lens, 8 ... CCD line sensor, 9 ... Program area, 10 ... Stamp, 11 ... C
D main body, 12 ... Program area, 13 ... Appearance inspection start position mark, 14 ... CCD line sensor, 15 ... Program area defect detection pixel, 16A, 16B, 16
C, 16D ... Pixels for appearance inspection start position mark detection, 17
… The appearance inspection start position groove.

Claims (7)

[Claims] 1. An optical recording disc, wherein an appearance inspection start position mark is recorded in a portion other than the program area of the optical recording disc body. 2. The appearance inspection start position mark includes:
At different positions in the radial direction of the optical recording disc body,
The optical recording disc according to claim 1, wherein a plurality of recordings are made at different angular positions in the circumferential direction. 3. The optical recording disk according to claim 2, wherein the plurality of appearance inspection start position marks are recorded on a spiral position. 4. An optical recording disk, wherein a visual inspection start position groove is continuously spirally recorded in a portion other than the program area of the optical recording disk main body. 5. The different angular positions in the circumferential direction are such that the angles between the respective visual inspection start position marks are substantially equal to each other.
The optical recording disc according to 1. 6. A visual inspection of an optical recording disk is performed by CC.
In the method using the D line sensor, a visual inspection start position mark is recorded in a portion other than the program area of the optical recording disk body, and a program area defect detection pixel and visual inspection start are performed as pixels of the CCD line sensor. A pixel for position mark detection is provided, and the optical recording disk body is rotated to move the CCD.
The visual inspection start position mark of the line sensor is used to detect the visual inspection start position mark, and the detected C
The CCD line sensor obtained by recognizing the circumferential position of the optical recording disk body from the pixel position of the CD line sensor and detecting the appearance inspection start position mark and rotating the optical recording disk body once from there. The optical recording is characterized in that the size of the defect on the entire surface of the optical recording disk main body and the absolute position in the radial direction and the circumferential direction are measured based on the information of the program area defect detection pixel of Disc visual inspection method. 7. A visual inspection of an optical recording disk is performed by CC.
In the method using a D line sensor, a visual inspection start position groove is continuously spirally recorded in a portion other than the program area of the optical recording disk body, and a program area defect is detected as a pixel of the CCD line sensor. Pixel and a pixel for appearance inspection start position groove detection are provided, and the optical recording disk body is rotated to
Appearance inspection start position of line sensor Appearance inspection start position is detected by the groove detection pixel, and the circumferential position of the optical recording disk body is recognized from the detected CCD line sensor pixel position. Based on the information of the program area defect detection pixel of the CCD line sensor obtained by rotating the optical recording disk body once after detecting the groove, the size of the defect on the entire surface of the optical recording disk body, A method for inspecting the appearance of an optical recording disk, characterized in that the absolute position in the radial direction and the absolute position in the circumferential direction are measured.