JPS62279538A - Production of optical disk - Google Patents

Abstract

PURPOSE:To not only inhibit copying of a disk but also protect recorded information by discriminating whether the final optical disk should be produced or not in accordance with presence or absence of discrimination information I and discrimination information II. CONSTITUTION:Data to be stored and discrimination information I are recorded on a master disk by a recorder 1. This optical disk I has generally a low reflection factor and cannot be reproduced by a reproducing device for normal read- only optical disks. The optical disk I is inputted to a disc processor 5, and it is checked by a discrimination information detector 2 whether discrimination information I is recorded on the innermost peripheral part or not and whether discrimination information II is recorded on the outside peripheral part of the recording part or not. Only when discrimination information I exists but discrimination information II does not exist, discrimination information II is recorded by a discrimination information recorder 3. Next, Al is vapor-deposited by a reflecting layer forming device 4 to produce an optical disk II. The optical disk II can be reproduced by the normal reproducing device.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a method for producing a writable optical disc.

2. Description of the Related Art In recent years, optical disks have been used for a wide variety of purposes, taking advantage of their large capacity and non-contact readability. Now, optical discs can be broadly classified into two types: read-only discs and writable discs. The former type of read-only disc is a method in which tens of thousands of discs with the same information are manufactured by transferring the information on a stamper on which information has been recorded in advance to a transparent substrate by molding and vapor depositing aluminum. Although manufacturers use expensive equipment, such as compact discs (hereinafter referred to as CDs), they can be produced at low cost through mass production.

On the other hand, the latter type of writable disc is suitable for small-scale production, and an example of a manufacturing method will be explained with reference to FIG. In FIG. 3, 1) is a recording device, and 12 is a reflective layer forming device. In a recording device 1), a signal is written onto a recording film to form a bit string.

The discs produced here generally have low reflectance, and for example, if it is a CD, it cannot be played with a conventional CD player. Therefore, aluminum can be vapor-deposited in the reflective layer forming device 12 to increase the reflectance, thereby making it possible to create a normal optical disc. (Reference: “Introduction to Video Discs and DAD,” Corona Publishing) Problems to be Solved by the Invention According to the optical disc creation method described above, information can be recorded relatively easily, and the created disc is a read-only disc. However, unlike read-only discs mass-produced by manufacturers, information can be recorded relatively easily, making it possible to copy information. It is necessary to protect the information on the disc, and when it comes to large-capacity data such as optical discs, the value of the recorded information is also quite expensive, making it especially necessary to protect the information.

In view of the above-mentioned problems, the present invention provides an optical disc creation method that protects information such as prohibiting copying of information on the disc.

Means for Solving the Problems In order to solve the above problems, the optical disc creation method of the present invention creates an optical disc having a first reflectance on which first identification information is recorded, verifying that the first identification information is recorded and no other identification information is recorded, recording second identification information on the same disc, and processing the optical disc to have a second reflectance; The first identification information includes identification information of the information recorded on the optical disc, and the second identification information includes information on changing the reflectance from the first reflectance to the second reflectance. This includes identification information of the device that performs the processing.

Effects According to the optical disc creation method described above, if there is no identification information of information recorded on the optical disc, the process of setting the second reflectance is not performed and the optical disc is not created. Furthermore, when all the contents of an existing optical disc are copied, there are two types of identification information: the identification information of the information to be recorded and the identification information of the device that processes the second reflectance. In this case as well, the process to obtain the second reflectance is not performed, and no optical disc is created. In order to protect the information on the disk as described above,
It is not possible to create an optical disc as a final product.

Example Below, regarding an optical disc creation method according to an example of the present invention,
This will be explained with reference to the drawings. FIG. 1 is a block diagram showing a method for creating an optical disc in an embodiment of the present invention.

In FIG. 1, 1 is a recording device, 2 is an identification information detection device, 3 is an identification information recording device, 4 is a reflective layer forming device, and 5 is a disk processing device. A recording device 1 records data to be stored on the disk and identification information 1 on the master disk.

For example, information for identifying the content of the data, the date of recording, a serial number for each recording, etc. are recorded as identification information r on the inner circumference of the area on the disc where data is recorded.

The optical disc 1 produced here has a low reflectance at −C and cannot be played back by a normal read-only optical disc playback device. Next, this optical disc 1 is input to the disc processing device 5. In the disk processing device 5, first, an identification information detection device detects whether or not identification information I is recorded on the innermost circumference. Furthermore, it will be examined whether the identification information (2) is recorded on the outer periphery of the disk where data is recorded. Here, only when the Subetsu information III exists and the identification recording device (3) does not exist, the next identification information recording device (3) records the identification information (2) on the disc. For example, in the identification information (2), identification information of the disk processing device 5, the date of processing, a serial number for each processing, etc. are recorded. FIG. 2 illustrates an optical disc on which identification information I and identification information (■) are recorded.Identification information (2) is recorded on the outer circumference of the identification information (I) on the circumference, sandwiching the data area.

Thereafter, the reflective layer forming device 4 produces an optical disc (2) in which aluminum is vapor-deposited to increase the reflectance. The optical disc (2) can be played on a normal read-only optical disc playback device.

As described above, according to this embodiment, since it is determined whether to create the final optical disc based on the presence or absence of the identification information 91) and the identification information H, recorded information can be protected.

That is, since the identification information I is detected, if the identification information does not exist, or even if it does exist, it is incorrect, the optical disc ■ cannot be created. Furthermore, since the identification information (2) is detected, if the identification information (2) exists, as in the case of copying an already existing disc, it is possible to prevent the creation of an optical disc (3).

In this embodiment, the identification information is recorded on the innermost circumference and the outermost circumference as shown in FIG. 2, but the present invention is not limited to this.

Effects of the Invention As described above, the present invention records two types of identification information, the first and second, in different steps in creating an optical disc, and controls the creation of the final disc based on the presence or absence of these identification information. , it is possible to protect the recorded information, including prohibiting copying of the disc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a method for creating an optical disc in one embodiment of the present invention, FIG. 2 is a diagram explaining an optical disc created in the embodiment in FIG. 1, and FIG. 3 is a conventional method for creating an optical disc. FIG. 1...Recording device, 2...Identification information detection device, 3...Identification information recording device, 4...
-Reflective layer forming device, 5... Disc processing device. Name of agent: Attorney Toshio Nakao (1 person) Figure 2

Claims (2)

[Claims] (1) Create an optical disc with a first reflectance on which first identification information is recorded, and confirm that the first identification information is recorded and no other identification information is recorded. A method for producing an optical disc, comprising: verifying the disc, recording second identification information on the same disc, and processing the optical disc so that it has a second reflectance. (2) The first identification information includes identification information of information recorded on the optical disc, and the second identification information includes identification information of the device that performs processing from the first reflectance to the second reflectance. The method for producing an optical disc according to claim 1, characterized in that the method includes identification information.