JPH029033A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To obtain identification information which is easily identifiable with naked eyes by forming rugged shapes having a specific depth or height and using these shapes as the identification information. CONSTITUTION:The identification information of signals, etc., by the rugged shapes having >=0.15mum depth or height is simultaneously formed on a substrate at the time when optical information signals are formed by stamping on at least one surface of the substrate. The information of said depth, etc., is easily visible even with the naked eyes and the optical information recording medium having the identification information which is easily identifiable with the naked eyes is obtd.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an optical information recording medium having identification information.

[Background Art] In recent years, with the trend toward high-density information, optical information recording media have come to be used in various fields, and their types are increasing and their uses are expanding.

For such optical information recording media, it is necessary to write identification information such as product number type, serial number, and purpose on the substrate by some means for identification. There are several identification methods, one of which is an identification method using equipment such as marking a specific depth on the board and reading the depth symbol with a depth measuring device, but the symbolization is complicated and Furthermore, it is not easy to implement because it requires a reading device. Conventionally, therefore, a means of visual identification has been used, and the identification symbol has been formed as shown below.

(a) By recording outside the signal area of the stamper on which the optical information symbol is to be formed, it is formed into an uneven shape on the same surface as the surface on which the optical information signal is to be formed.

(b) Printing after forming the substrate.

[Problem to be solved by the invention (m)] However, although the method (a) can be formed relatively easily, the depth of the identification symbol must be made equal to the optical information signal due to the stamper operation, and it cannot be seen with the naked eye. It has the disadvantage that it is difficult to identify, and in method (b), printing is performed after molding, which makes handling complicated and increases the number of manufacturing steps.

In the case of (a), since the stamper on which the optical information signal is recorded is used, the unevenness of the identification signal is limited to about 2000 people at most, but such unevenness makes it very difficult to identify the person with the naked eye.

The present invention improves the above-mentioned drawbacks and provides an optical information recording medium on which symbols are formed that are easy to identify with the naked eye.

[Means for Solving the Problems] According to the present invention, in an optical information recording medium formed by molding an optical information signal on at least one surface of a substrate, 0.15
The identification information of the optical information recording medium can be identified with the naked eye by forming the identification information in a concavo-convex shape having a depth or height of μm or more.

That is, as a result of intensive research into how to form identification information having a depth or height that can be discerned with the naked eye, the present invention has developed a method for forming identification information that has a depth or height that can be discerned with the naked eye.
Paired with this stamper, another stamper is installed for recording identification information in place of the mirror mold, and when molding the optical information recording medium, the identification information is also molded at the same time as the optical information signal is molded, making it possible to visually check the mold. It has been found that it is possible to obtain an optical information recording medium in which a discernible uneven surface of 0.15 μm or more is formed on the opposite surface to the optical information recording surface. Further, the uneven surface serving as the identification information does not affect the optical information signal and can be easily identified with the naked eye.

Further, when molding an optical information recording medium, the same uneven surface as described above can be molded using a mold located on the side surface of the molded product.

When molding identification information on the surface opposite to the optical information recording surface, it is possible to mold the information using a mirror mold with a pattern written thereon, but the pattern is restricted and pattern change is restricted, so it is preferable. is molded using a stamper.

A preferred location for the identification information is a portion of the optical information recording surface opposite to the portion where the optical information signal is not recorded, and in this position, the identification information can be molded without affecting the optical information signal in any way. .

In addition, when molding on the sides, the thickness of the substrate may not be sufficient or the symbols that can be expressed may be limited, but it does not affect the optical information signal, and optical information signals are molded on both sides of the substrate. It is effective and preferable in such cases.

According to the method described above, it is possible to form an uneven surface in a wide range from 0.15 μm to 1000 μm, although it varies depending on the thickness of the substrate, the symbol to be recorded, etc.

The optical information recording medium according to the present invention has an optical information signal formed on at least one surface of the substrate, and in addition to ordinary single-layer and multi-layer disks, sandwich single-layer disks have two sides. It can also be applied to those having optical information signals.

As identification information, all conventionally used information symbols can be formed. In other words, symbols such as product number, type, purpose, manufacturing number, etc. are possible.

The stamper 1 mold used for molding may be substantially the same as those commonly used.

The invention will be further explained with reference to the drawings. In the molding apparatus shown in FIG. 1, a conventional stamper 3 is used for molding optical information signals, and a stamper 4 for molding identification information is paired with the stamper 3, thereby molding optical information signals. At the same time, identification information can be formed. Also, it is usually used as a mirror surface. Into the mold (5 in Figure 2)
By directly writing a pattern on the substrate, it is possible to simultaneously form an optical information signal on one side and identification information on the other side.

This can also be done by writing identification information on the mold (6 in FIG. 2) located on the side of the molded product.

[Example] An optical disc (1
When a 30mm φ) was manufactured, ABCDEF was written on the opposite side to the optical information recording surface, identification information 12345 was written on the outer periphery, and 19
An optical disc with identification information 880219 molded on the inner circumference was obtained.

In addition, the outer symbol has a depth of 10 ALm, and the inner symbol has a height of 1
It was 0 μm and could be easily identified with the naked eye.

On the other hand, when identification information was molded on the same surface as the optical information recording surface using a conventional stamper as shown in FIG. 4, the identification information was approximately 1000 people deep and could hardly be identified with the naked eye.

[Effects of the invention] As explained above, by simultaneously forming the identification information when recording the optical information signal, the 0.15 μm
The above-mentioned identification information based on the uneven surface can be easily determined visually, and the formation of the identification information can be done without increasing manufacturing costs or affecting the optical information signal, making it very effective. It is. In addition, if an optical information recording medium with an appropriate thickness is used, the thickness of 1000 μm can be determined by the touch of the finger.
It is very useful because it can mold identification information on the order of m.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of a mold for producing the optical information recording medium of the present invention, Fig. 2 is a schematic cross-sectional view of a conventional mold, and Fig. 3 is a stand bar pattern for forming identification information used in the examples. figure,
FIG. 4 is a diagram of a conventional identification information entry stanbar pattern. l... Identification information pattern, 2... Optical information recording pattern, 3... Optical information recording pattern forming stand bar 6...
Molded product, 7... Optical information recording medium.

Claims (1)

[Claims] An optical information recording medium formed by molding an optical information signal on at least one surface of a substrate, characterized by having identification information formed in an uneven shape having a depth or height of 0.15 μm or more during molding. Information recording medium.