JPH0444818B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc on which information is optically recorded and used for reproducing the recorded information.

[Conventional technology]

FIG. 2 is a sectional view showing an example of a conventional double-sided recording type optical disc. As shown in the figure, hub 1
In addition, two disks 3 are fixed so as to face each other with an outer circumferential spacer 2 interposed therebetween. This disk 3 is composed of a transparent disk substrate 4 and a recording film 5 provided on one side thereof, and a pregroove 5a is formed concentrically in the recording film 5.
The two disks 3 are arranged so that their recording films 5 face each other.

On the other hand, the hub 1 is made of a wear-resistant material such as metal, and a spindle (not shown) of a drive device is inserted into the center of the hub 1 to position the optical disk within the device. A center hole 1a is provided for this purpose. 6 in the figure is an air gap formed between two disks 3.

FIGS. 3 to 5 are explanatory diagrams showing the manufacturing process of this optical disc, and an example of the method of manufacturing the optical disc will be explained based on these diagrams.

First, as shown in FIG. 3, an uncured ultraviolet curable resin 8 having fluidity is dropped onto a stamper 7 having a large number of concentric grooves 7a corresponding to the pre-groups 5a on its surface. This stamper 7
is manufactured in a subsequent stamper manufacturing process based on a master manufactured in a master manufacturing process. Then, the optical disk substrate 4 is pressed onto the resin 8 in a slightly curved state so that the center part thereof faces downward, and then the peripheral part is gradually lowered onto the stamper 7. When the disk substrate 4 is pressed against the stamper 7 in this manner, the ultraviolet curable resin 8 is forced outwardly between the two and is filled into each of the grooves 7a.

Thereafter, ultraviolet rays 9 are irradiated from above the disk substrate 4 as indicated by arrows in FIG. 4 to cure the ultraviolet curing resin 8. Next, when the disk substrate 4 is peeled off from the stamper 7, the cured resin film is also separated from the stamper 7 together with the disk substrate 4, thereby forming the pregroove 5a and further forming the recording film 5. In this way, the replica process is completed.

Next, the center position of the disk substrate 4 is optically determined using the pre-groove 5a, and based on this, a central through hole 4a is provided in the disk substrate 4, and the hub 1 and the outer peripheral spacer 2 are bonded to these and assembled. In this way, an optical disk as shown in FIG. 5 is manufactured.

As is clear from the above description, since optical disks are manufactured through various processes, a large number of manufacturing conditions including peeling conditions in the replica process are required as data. Also,
During and after manufacturing, a large number of inspections are performed, including the amount of eccentricity of the disk substrate 4 with respect to the hub 1, and the results of these inspections are also required as data.

In this way, data on various manufacturing conditions and inspection results have traditionally been filed in documents and managed and stored by manufacturers, and used as data to investigate the cause of any troubles that occur in the market. be done.

[Problem to be solved by the invention]

However, there is a correlation between the manufacturing lot number, which is given the same number under the same manufacturing conditions, and the serial number, which is given as a serial number to non-defective products manufactured under various manufacturing conditions. There is no relationship. Moreover, as mentioned above, the data on manufacturing conditions and test results contains a very large amount of information, so the conventional storage method using documents has the disadvantage that it takes a lot of time to search for causes.

The present invention attempts to eliminate the drawbacks of the prior art, and its purpose is to reproduce manufacturing history data such as manufacturing conditions and inspection results by reproducing information pre-recorded on an optical disk. Then,
An object of the present invention is to provide an optical disk that can be searched quickly and a method for manufacturing the same.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides information on the manufacturing history in advance at the time of shipping an optical disc to a track area other than a recording area (user track area) used by a user to record information on a recording film provided on a disc. It is distinctive in that it is recorded optically.

[Effect]

With this configuration, even if a problem occurs with the optical disk, the cause of the problem can be quickly investigated by reproducing the manufacturing history information recorded on the optical disk.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of an optical disk according to the present invention. In the figure, 10 is a user track area, 11 is a history information recording track area, and 12 is a user track area.
1 is a replacement track area, 13 is a guard track area, and parts corresponding to those in FIG. 2 are given the same reference numerals.

In FIG. 1, the recording film of the disk 3 includes a user track area 10 and a history information track area 1.
1. It has a plurality of different tracks consisting of an alternate track area 12 and a guard track area 13. The widest user track area 10 is an area used by the user for recording and reproducing information, and the replacement track area 12 inside the user track area 10 is used when the user track area 10 becomes unrecordable due to some failure. Record information when you get old.
This is a spare area used for reproduction, and these two tracks 10 and 12 constitute a recording area on the user side.

Further, a history information track area 11 located outside the user track area 10 is an area in which various data regarding manufacturing conditions and various data regarding inspection results are recorded. Further, guard track areas 13 located outside the history information track area 11 and inside the replacement track area 12 are unused areas that are not used for recording or reproduction.

The history information recorded in the history information track area 11 is stored in the form of code information, coded image information, or coded audio information after all manufacturing processes including manufacturing to inspection processes are completed. After the history information is optically recorded on the optical disk 3 by the manufacturer, it is shipped to the market.

Among the historical information, the specific contents of the manufacturing conditions are: 1. Glass lot number during the master manufacturing process, 2. IPA (isopropyl alcohol) lot number, 3. Contact angle, 4. Diffraction method data, 5. Photoresist film thickness, 6 Post-exposure during stamper production, 7 Post-bake, 8 Nickel deposition conditions, 9 PH value and temperature of plating liquid, 10 Current density, 11 Number of revolutions, 12 Time, 13 Film thickness, 14 Backing adhesive conditions, 15 UV exposure Conditions, 16 Plasma assembler, 17 Protective plate adhesion conditions, 18 Glass lot number during replica connection process, 19 Contact angle, 20 Silane lot number, 21 Nitrocellulose lot number, 22 UV resist lot number, 23 Vapor deposition time, 24 During vapor deposition Examples include split time, 25 peeling distance, 26 reflectance and transmittance data, 27 visual inspection data, 28 manufacturing equipment numbers for each process, etc.

On the other hand, the specific contents of the inspection results are as follows: 1. Eccentricity, 2. Acceleration of eccentricity, 3. Vertical runout, 4. Vertical runout acceleration, 5. Defect rate of data section, 6. Number of errors and address of preformat section, 7. Signal amplitude of preformat section. 8. groove noise, 9. track offset, 10. track noise, 11. autofocus noise, 12. track modulation degree, etc.

For optical disks configured in this way,
Even if a problem occurs in the market with an optical disc, the history information track area 11 of the optical disc
By searching for the preformat part that shows this, its manufacturing history can be replayed, and the cause of the trouble can be quickly investigated.

In the above embodiment, a case has been described in which the history information track area 11 is provided at the outer peripheral position of the recording area, but this history information track area 11 is located at the inner peripheral position of the recording area, that is, the replacement track area 1.
2 and the inner guard track area 13.

Further, in the history information track area 11, even after the optical disc is shipped, it is possible to record details of troubles that occur when the user uses the optical disc.

〔Effect of the invention〕

As explained above, according to the present invention, even if a problem occurs in the market with an optical disk, the cause of the problem can be quickly investigated by reproducing the manufacturing history information previously recorded on the optical disk. The disadvantages of the prior art described above can be overcome and an optical disc with excellent functions can be provided.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of an optical disk according to the present invention, FIG. 2 is a sectional view showing an example of a conventional optical disk, and FIGS. 3, 4, and 5 are views of an optical disk. It is a sectional view showing an example of a manufacturing process. 1...Hub, 3...Disk, 4...Disk substrate, 5...Recording film, 10...User track area, 11...History information track area, 12...Alternative track area, 13...Guard track area .

Claims (1)

[Claims] 1. In an optical disc used for optically recording information and reproducing the recorded information, a recording film other than a recording film track area used by a user to record information in a preformatted portion of the recording film. An optical disc characterized in that it is completed by optically recording history information of the manufacturing process of the optical disc in a track area of the disc. 2 The history information of the optical disc manufacturing process is based on the master disk,
The optical disc according to claim 1, characterized in that the information is information on each process of a stamper, a replica, recording film deposition, optical disc assembly, and optical disc inspection. 3. An optical disc characterized in that the recording film track area for recording the history information is an outer preformat area other than the user information recording track area. 4. The optical disc according to claim 1, wherein the historical information recording film track area is an inner preformat area other than the user information recording track area. 5. The optical disc according to claim 4, wherein the recording track area for the history information is adjacent to a recording film track area used by the user to record information. 6. The optical disc according to claim 1, wherein the history information is encoded image information or audio information. 7. In an optical disk used for optically recording information and reproducing the recorded information, a stamper having concentric grooves and a preformat portion formed on the surface is created using a master disc, and the surface of the stamper is Transfer the pattern to the disk substrate surface,
The process of peeling off from the stamper to form a replica layer and forming a recording film on the replica layer to form an optical disc, and the manufacturing process information obtained from manufacturing to inspection of the optical disc, 1. A method of manufacturing an optical disc, characterized in that the optical disc is manufactured by a step of optically recording on a preformat section of the optical disc excluding a user information recording area. 8. The optical disc manufacturing method according to claim 7, wherein the recording of the history information of the manufacturing process in the recording film preformat section is optically recorded on the optical disc after the inspection process.