JPH0352673B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a master disc of an information recording medium disc used in manufacturing a recorded information recording medium disc.

(Prior Art) Record disks, video disks, and the like are conventionally known as typical recorded information recording medium disks.

Then, the recorded information recording medium disk is mass-duplicated using a stamper manufactured through a predetermined process based on one master disk.

For example, for a normal record disc or an information recording medium disc for an information signal recording/reproducing system that detects changes in capacitance using conductive synthetic resin as the disc material, the master disc of the information recording medium disc→ It is well known that a large number of copies can be made using a metal stamper made through the master-to-mother process. It is also well known that intermediate products of information recording medium disks are produced in large quantities using stampers made through predetermined processes based on master disks of information recording medium disks.

(Problems to be Solved by the Invention) As described above, the recorded information recording medium disk is stamped with the recorded information by a stamper that is made through a predetermined process based on the master disk of the information recording medium disk. Final products of recording media discs or intermediate products of recorded information recording media discs are being produced in large quantities, and as mentioned above, stampers are used to transfer information recording media discs from master to mother. Since the stamper is obtained after going through each process, unless some kind of identification means is applied, it will be unclear which stamper is the final one and which master it was made for. Things also happen.

To this end, a specific identification code using letters, numbers, symbols, etc. is engraved on each master disc in an area other than the original recording area of the information signal that is traditionally recorded and reproduced on the information recording medium disc. Things were being done.

However, the stamper is obtained after going through each process from master to mother from the master of the information recording medium disk, and the state of the unevenness of the disk surface is reversed before and after each of the above-mentioned sequential steps. Since the contents of the record are transferred sequentially, the pattern of the identification code engraved on the master disc can be transferred forward, backward, or alternately during each process from the master disc to the stamper. Therefore, since the pattern of the identification code is reversed every other step in the sequential steps described above, the operator can quickly and accurately identify the pattern. It was causing problems in carrying out the work.

(Means for Solving the Problems) The present invention provides for writing characters, numbers, symbols, or any of them in an area other than the recording area of the original information signal that is the target of recording and reproduction of an information recording medium disk. An information recording medium disc in which a display for identifying the information recording medium disc is recorded as a change in geometric shape so that an arbitrary combination of the above is recorded in a recording manner in which the information recording medium disc is written side by side in a forward and reverse pattern. An information recording medium disk that has letters, numbers, symbols, or any combination thereof in areas other than the original recording area of the information signal that is the target of recording and reproduction on the master disk and information recording medium disk. The display for identification is recorded as a change in the geometric shape so that the display is recorded in a recording mode in which the information recording medium disc is written in a normal and reverse pattern. The present invention provides a master disc of an information recording medium disc in which different marks are added to the display of the pattern.

(Example) Hereinafter, specific contents of the master disc of the information recording medium disc of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are plan views of different embodiments of the master disk of the information recording medium disk of the present invention, respectively, and in each figure, O _a is the center hole of the master disk D of the information recording medium disk, Further, A1 and A2 each indicate an area other than the original recording area of the information signal that is targeted for recording and reproduction on the information recording medium disk, and further, B represents an area that is targeted for recording and reproduction on the information recording medium disk. This shows the recording area of the original information signal.

The master disk D of the information recording medium disk of the present invention shown in FIG. Only on A1, the geometric design is made such that letters, numbers, symbols, or any combination of these are used to identify the information recording medium disk, in a recording mode that is written side by side in a forward or reverse pattern. This is an example of a case where the information is recorded as a change in shape, and the master disk D of the information recording medium disk shown in FIG. Both areas A1 and A2 other than the signal recording area are marked with letters, numbers, symbols, or any combination thereof for identification of the information recording medium disk in a forward or reverse pattern. This is an example of recording as a change in geometric shape so as to achieve the recording mode described above.

In the embodiment shown in FIGS. 1 and 2, the recording area B of the original information signal that is to be recorded and reproduced on the information recording medium disk is It goes without saying that the original information signal being displayed is the one that is being recorded.

In each of the diagrams, one of the areas A1 and A2 other than the recording area of the original information signal targeted for recording and reproduction on the information recording medium disc is
Alternatively, an identification code for identification, that is, a display 2, 3 for identifying the information recording medium disc by any one of letters, numbers, symbols, or any combination thereof (in the illustrated example, CD1234 −
9ABCDEF) is recorded as a change in the geometric shape so that it is recorded in a recording mode in which the forward and reverse patterns 2 and 3 are written side by side.
In the identification displays 2 and 3 shown in the figure, the pattern of identification display 2 is a positive pattern, and the pattern of identification display 3 is a negative pattern. This is an example of a case where

Then, as mentioned above, it should be performed on one or both of the areas A1 and A2 other than the original recording area of the information signal that is the target of recording and reproduction on the information recording medium disc. , a record of an identification code for identification, that is, a display 2, 3 for identifying the information recording medium disc by any of letters, numbers, symbols, or any combination thereof (in the illustrated example, CD1234-
The recording in the forward and reverse patterns 2 and 3 of 9ABCDEF) is performed using the recording means ( for example,
This can be done by a recording means similar to laser cutting.

As a result, even if the original information signal to be recorded and reproduced on the information recording medium disk in the master disk D of the information recording medium disk is recorded in the recording area B in a high-density recording state, the information recording medium disk By implementing the display for identification as described above in areas A1 and A2 other than the original recording area of the information signal that is the target of recording and reproduction,
Nothing that would adversely affect the recorded content in the recording area B described above occurs.

Note that since the area A2 on the master D of the information recording medium disc is a part that is not present in the final product information recording medium disc, the area A2 in the master D of the information recording medium disc having the configuration shown in FIG. Area A
Indication for identification recorded in part 2 2,
3 is of course not transferred to the information recording medium disk of the final product.

The master disk of the information recording medium disk of the present invention explained with reference to FIG. 1 and FIG. , numbers, symbols, or any combination thereof for identification of the information recording medium disc 2, 3, positive,
Because it is recorded as a change in geometric shape so that it is recorded in a reverse pattern (the reverse pattern is a mirror image of the positive pattern), For discs obtained in any process from the master of the information recording medium disc to the master to mother process until the stamper is made, there is a stamp for identification applied in advance to the master D of the information recording medium disc. Since one of the reverse pattern displays 2 and 3 is always displayed as a pattern that can be seen as the positive pattern, the operator can quickly and accurately identify the recorded contents of the disk. According to the master disk of the information recording medium disk of the present invention having the structure shown in FIGS. be.

However, characters, numbers,
Display for identifying the information recording medium disc by any symbol or any combination thereof; 2;
3 was recorded as a change in the geometric shape so that the recording pattern was written in a normal and reverse pattern (the reverse pattern is a mirror image of the positive pattern). Information on the master disk of the information recording medium disk of the present invention having the configuration shown in FIGS. 1 and 2, and the master disk, mother disk, stamper, and final product made based on the master disk of the information recording medium disk described above. In the recording medium disk, one of the indications 2 and 3 of the forward and reverse patterns for identification, which have been applied in advance to the master disk D of the information recording medium disk, can always be seen as a positive pattern. Since the pattern is displayed as a pattern that allows the operator to quickly and accurately identify the recorded contents of the disc, it is possible to quickly and accurately identify the recorded contents of the disc. The fact that one of the displays 2 and 3 using positive and reverse patterns for identification is always displayed as a pattern that can be seen as a positive pattern means that, for example, the information recording medium disc Regarding recording media made of transparent materials, such as master discs and final production discs, it is difficult to determine whether they are front or back, or whether an intermediate product disc is the master disc. , It is not easy to distinguish between the mother board and the stamper.
This problem may occur.

FIGS. 3 and 4 illustrate an embodiment of an information recording medium disk master that does not have the above-mentioned problems that occur in the information recording medium disk master disk of the present invention explained with reference to FIGS. 1 and 2. 3 and 4, and the same constituent parts as the master disk of the information recording medium disc shown in FIGS. 1 and 2 are shown in FIGS. 1 and 2. The same drawing numerals as those used inside are used.

Now, in each embodiment of the master disk of the information recording medium disk of the present invention shown in FIGS. 3 and 4,
As can be readily seen by comparing FIG. 3 with FIG. 1 and FIG. 4 with FIG. 2, the information record of the present invention already described with reference to FIGS. The difference between the master disk of the medium disk and the master disk of the information recording medium disk of the present invention shown in FIGS. 3 and 4 is that in the master disk of the information recording medium disk shown in FIGS. An identification code for identification, that is, a letter, number, or symbol, is placed on one or both of the areas A1 and A2 other than the recording area B of the original information signal that is the target of recording and reproduction on the recording medium disc. Displays 2 and 3 for identifying the information recording medium disk by either one or any combination thereof (in the illustrated example, CD1234-9ABCDEF)
, positive and reverse patterns 2 and 3 (in the illustrated example, the pattern of display 2 for identification is a positive pattern, and the pattern of display 3 for identification is a negative pattern) In addition to recording as a change in the geometrical shape so as to achieve the recording mode described in parallel in the above-mentioned information recording medium disk, the above-mentioned forward and reverse pattern displays 2 and 3 for identifying the information recording medium disk are also provided, respectively. The difference is that different marks M2 and M3 are added to the .

In the embodiment shown in FIGS. 3 and 4, "A" is used as the mark M2, and
Although an example is shown in which "O" is used as the mark M3, it goes without saying that any letter, number, or symbol may be used as the marks M2 and M3.

Like the master disk of the information recording medium disk of the present invention shown in FIG. 3 and FIG.
If marks M2 and M3, which are different from each other, are added, the display of the pattern that can be read correctly among the displays 2 and 3 of the forward and reverse patterns for identifying the information recording medium disc will be the mark M2. The information recording medium disc can be easily distinguished by the marks M2 and M3 as to whether it is display 2 of the pattern to which the mark M3 is added or display 3 of the pattern to which the mark M3 is added. The front and back sides of discs made of transparent materials, such as master discs and final product information recording media discs, can be immediately identified, and the mark M
If the display 2 of the pattern with 2 added can be read correctly, it is the mother disc.
Also, if the mark M3 can be read correctly,
You can immediately tell that it is a master disc or a stamper.

(Effects of the Invention) As is clear from the above detailed explanation, the present invention has the advantage of adding characters and numbers to an area other than the original recording area of an information signal that is the target of recording and reproduction on an information recording medium disc. , symbols, or any combination thereof to identify the information recording medium disk, as a change in the geometric shape so that the recording mode is written in a forward or reverse pattern. The master disk of the information recording medium disc that is recorded,
And, in an area other than the original recording area of the information signal targeted for recording and reproduction on the information recording medium disk,
Geometric shapes so that letters, numbers, symbols, or any combination thereof, for identifying the information recording medium disc are written side by side in a forward or reverse pattern. The information recording medium disk is recorded as a change in the information recording medium disk, and the information recording medium disk is recorded by adding different marks to the forward and reverse pattern display for identifying the information recording medium disk. For discs obtained in any process from the master disc to the master → mother process until the stamper is made, a display of forward and reverse patterns applied in advance to the master disc D of the information recording medium disc for identification. Since one of 2 and 3 is always displayed as a pattern that can be seen as the positive pattern, the operator can quickly and accurately identify the recorded contents of the disc. , In addition, different marks M2 and M3 are placed on the displays 2 and 3 of the forward and reverse patterns for identifying the information recording medium disc, respectively.
By adding the mark M2, the display of the correctly read pattern among the forward and reverse pattern displays 2 and 3 for identifying the information recording medium disc will be the display of the pattern to which the mark M2 is added. Marks M2 and M3 make it easy to tell whether it is display 2 or display 3 of the pattern with mark M3 added, so information on the master disc of the information recording medium disk or the final product can be easily distinguished. Even if the disc is made of a transparent material such as a recording medium disc, the front and back sides of the disc can be easily identified, and if the display 2 of the pattern on which the mark M2 is added can be read correctly, then , it is a mother disc, and if the mark M3 can be read correctly, it is a master disc or a stamper, so it is easy to distinguish between discs, and the information recording of the present invention According to the master disk of the medium, the above-mentioned conventional problems can be satisfactorily solved.

[Brief explanation of drawings]

1 to 4 are plan views of different embodiments of master discs for information recording medium discs according to the present invention, respectively. D...Original disc of information recording medium disc, O _a ...Center hole of master disc D of information recording medium disc, A1, A2...
Area other than the recording area of the original information signal targeted for recording and reproduction on the information recording medium disk, B... Recording area of the original information signal targeted for recording and reproduction on the information recording medium disk, 2. 3...Indication of letters, numbers, symbols, or any combination thereof in mutually opposite patterns for identifying the information recording medium disc, M2, M3...marks.

Claims (1)

[Claims] 1. Information in the form of letters, numbers, symbols, or any combination thereof in an area other than the recording area of the original information signal that is the target of recording and reproduction on the information recording medium disk. A master disc of an information recording medium disc, which is recorded as a change in geometric shape so that an indication for identifying the recording medium disc is written side by side in a forward and reverse pattern. 2. Identification of the information recording medium disc using letters, numbers, symbols, or any combination thereof, in areas other than the original recording area of the information signal targeted for recording and reproduction on the information recording medium disc. In addition to recording the display as a change in geometric shape so that the display is recorded in a recording mode in which the normal and reverse patterns are written side by side, the display of the above-mentioned normal and reverse patterns for identifying the information recording medium disc is recorded. A master disc of an information recording medium with different marks added to each display.