JP2000251330A - Optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To judge whether rewriting or writing in an optical disk is forbidden or not by seeing the optical disk itself. SOLUTION: In the optical information recording medium 1 having an information recording area 2 and an information rewriting or writing forbiddance display area 3 on the transparent substrate, capable of recording or reproducing information with light and having no jacket case for protection, the information recording area 2 and the information rewriting or writing forbiddance display area 3 are formed from the same optical information recording layer and whether information rewriting or writing is forbidden or not can be judged by seeing the rewriting or writing forbiddance display area 3 under visible light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium for recording and reproducing information, and more particularly to an optical information recording medium having a rewritable or write-protected information display area.

[0002]

2. Description of the Related Art In an optical information recording medium (hereinafter, referred to as an optical disk) for optically reproducing or recording / reproducing information, an optical disk of a type conventionally housed in a cartridge is provided with a mechanism for prohibiting rewriting of the cartridge. A slider, a holder, and the like are provided, and depending on the presence or absence of the slider or the holder, rewriting of the information content is prohibited and display is performed (for example, Japanese Utility Model 8-758).
No. 1, Japanese Utility Model Registration No. 2554288). However, in the case of a bare disk which is not housed in a cartridge, there is no slider or holder, so that the above method cannot be used.

[0003]

As described above, in the above-mentioned conventional optical disk, in order to determine whether or not the disk is a rewritable or writable disk by itself, the optical disk is used in an information recording / reproducing apparatus. It was necessary to load the data and read the data to check whether rewriting or writing was prohibited. Therefore, it is extremely inconvenient to handle a large number of optical disks or to record quickly. An object of the present invention is to solve the above-mentioned problem by displaying whether rewriting or writing of information is possible on a so-called bare disk on the disk itself.

[0004]

According to the present invention, a rewrite or write prohibition display area is provided on the inner peripheral side of an information recording area so that when the rewrite or write of information is prohibited, the area can be visually recognized. The above problem is solved by realizing the display by a simple and inexpensive method without using a new recording unit. According to a first aspect of the present invention, an information recording area 2 is provided on a transparent substrate, and an information rewrite or write-protect display area 3 is provided so that information can be recorded and reproduced by light. Information recording medium 1 not provided with
In the above, the information recording area 2 and the information rewrite or write prohibition display area 3 are formed of the same optical information recording layer, and whether or not the information rewrite or write prohibition is determined is displayed on the rewrite or write prohibition display area 3 by visible light. When recording the rewritable or write-inhibited information in the rewritable or write-inhibited display area 3 as the second invention,
3. The optical information recording medium 1 according to claim 1, wherein pit data 5 serving as position data is provided. As a third invention, a symbol mark 6 is provided around a rewritable or write-inhibited display area 3. An optical information recording medium is provided.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the optical disk according to the present invention will be described with reference to FIGS. FIG.
FIG. 2 is an external view of an optical disk according to the present invention, and FIG. 2 is a partial detailed view of FIG. In FIG. 1, 1 is an optical disk main body,
Reference numeral 2 denotes an information recording area formed on the optical disc main body 1, reference numeral 3 denotes a rewritable or write-inhibited display area provided on the inner peripheral side of the information recording area 2, and reference numeral 4 denotes a hub for holding the optical disc. It is a through hole. In FIG. 2, reference numeral 5 denotes a part of the rewritable or write-inhibited display area 3 in order to record the rewritable or write-inhibited information effectively so that it is possible to visually check whether the disk is rewritable or writable. The pit data 5 is formed pit data, and by reading the pit data 5 with an optical head (not shown), the pit data 5 can be used as data at a position where rewrite or write prohibition information is recorded.

Next, a method for producing an optical disk according to the present invention will be described. First, a method for manufacturing a substrate will be described. In preparing the substrate, first, a photoresist is uniformly applied to an original plate such as a glass disk, and then exposure is performed using laser light in accordance with the shapes of the grooves and pits.
At this time, the pit data 5 is radially and circumferentially arranged not only on the information recording area 2 but also on the inner peripheral side to be the rewrite or write prohibition information area 3 to be described later. The beginning of the information,
Scale to indicate the end. The recording layer has the same optical information recording layer in the information recording area 2 and the rewritable or write-inhibited information area 3 in order to simplify the production of the optical disc 1 and its operation. As the same optical information recording layer, for example, a phase change recording film or the like can be used. Since the same optical information recording layer is used as described above, it is easy to manufacture the optical disk main body 1 as a medium, and the optical head for information recording can be used as a recording head for rewriting or write-protection information. Signal processing and control of the optical head are also facilitated. Thereafter, the exposed resist is developed and washed to obtain a predetermined master.

Next, a thick metal layer is formed on the finished master by electroforming, and this is peeled off from the master to obtain a stamper. A substrate can be obtained by installing this stamper in an injection molding machine and molding it using polycarbonate.

The optical disk 1 is obtained by forming a phase change film as a recording layer, for example, on the substrate manufactured by the above-mentioned process, and further forming a film having a high reflectance, such as gold or aluminum, as a reflection layer. be able to.

FIG. 2 is a partially detailed view mainly showing a scale portion of FIG. By reading the pit data 5 on the circumference, it can be recognized as position data of a scale portion. The pit data 5 in FIG. 1 as this position data is
Rewriting or writing can be formed as a writing start position (start end) of the prohibition display data. The end point of the start of writing the prohibition display data may be set based on the start end, or the start end may be designated as the end. Also described later, beginning 5 ₁ described above as shown in FIG. 3
The the same prohibition display data writing end point (end portion) 5 ₂ may be formed with the pit data provided with. The pit data 5 is formed corresponding to a recording track extending from the outer periphery to the inner periphery of the rewrite or write prohibition display area 3.

It is sufficient that pits are formed in the circumferential direction of each track in accordance with the number of pits of the address of the position data. Here, when writing the rewrite or write inhibit display data, the address of the track to which the optical head (not shown) first moves is defined as “0 position”. The above-mentioned start end or end end can be said to be an aggregate of the start end and the end of the rewrite or write prohibition display data in each track. Further, the shape of the rewrite or write prohibition display area 3 is not particularly limited, as long as it has a size that can be visually checked. In FIGS. 2 and 3, the pit data 5 (5 ₁ , 5 ₂ ) is formed on a straight line.
Need only be recognized as the start and end of the position data, and may be provided in accordance with the shape of the rewrite or write-protect display area 3 or the size of the area.

Next, a description will be given of a case where the optical disc main body 1 is used to display, for example, rewrite inhibition information. First, normal recording is performed using the optical disc main body 1. At the end of recording, it is stored in an information recording / reproducing device (not shown) whether or not rewriting or writing of the optical disc main body 1 is prohibited. When prohibiting rewriting or writing to the optical disc main body 1, after recording information to be recorded in the information recording area 2, the optical head (not shown) is moved to the 0 position of the pit data scale, and rewriting or writing is prohibited from there. In the display area 3, recording for displaying rewriting or writing prohibition is performed.

Since the length of the recording for the rewrite or write prohibition display only needs to be visually discriminated by the user, an arbitrary recording pattern which is easily discriminated visually in the region from the start end to the end can be formed. For example, continuous recording may be performed from the inner peripheral portion to the outer peripheral portion in the region from the start end portion to the end portion (that is, the entire surface is recorded in the region), or one or several rounds may be recorded on the circumference based on the start end portion. May be performed. As described above, since the recording only needs to be made visible, the recording pattern does not need to be particularly the same as the information recording area 2. In order to make it easier to see visually, it is possible to arbitrarily set the recording line width and the like for the recording pattern. Since an optical head (not shown) for recording information has a narrow track width, the track is usually moved one track at a time in the area of the start end and the end of the track until the width (or pattern) becomes easy to see. The operation will be repeated. As a result, in the optical disc main body 1, the rewrite or write prohibition information is displayed in a visible state. Here, the information detected by the optical head (not shown) as the rewrite or write prohibition information may be the record information of the rewrite or write prohibition display area 3 described in detail above, or may be the same as the information record area 2. It may be recorded as prohibition information.

As described above, the rewrite or write prohibition information is recorded in a predetermined position in a visible state (pattern). Therefore, in the case of the optical disc main body 1 having the record, it is determined that the disc is a write-protected disc. The user can easily recognize that the optical disc main body 1 is in a rewrite or write-protected state. In this case, since the information recording area 2 and the rewrite or write prohibition display area 3 are formed of the same optical information recording layer, manufacture as a medium is easy. Furthermore,
The recording of the information signal and the rewriting or write-protection information includes:
Since the same optical head can be used in common, signal processing at the time of recording of rewriting or write-protection information and control of the optical head can be easily performed. Also, when the rewrite or write prohibition information recorded in the rewrite or write prohibition display area 3 is detected as a signal, it can be easily read by the same optical head as in the above. Further, the rewrite or write prohibition information is rewritten or write prohibition display area 3.
Since the pit data serving as the position data when writing the data is formed, the rewrite or write prohibition information can be accurately and easily recorded, and the recording pattern can be easily controlled. Therefore, it is possible to easily and effectively display the prohibition information that is easily visually identified.

FIG. 3 is an external view of another embodiment of the optical information recording medium according to the present invention. Oite in FIG. 3, 5 _1,
Rewriting or recorded beginning write protected display area 3, 5 ₂ is the end portion. Reference numeral 6 denotes a rewrite or write-protect display area 3 on the optical disc 1.
Is a symbol mark provided around the area 3 so that it can be immediately confirmed. Thus, by providing the symbol mark 6 around the rewrite or write prohibition display area 3, the rewrite or write prohibition display area 3 is provided.
Can be easily recognized.

By using the optical disk main body 1 of the present invention, it is possible to display a rewrite or write-protection in this way, and it is easy to know beforehand whether or not recording is possible before use.

[0016]

As is apparent from the above description, in the optical disc of the present invention, the information recording area and the rewritable or write-inhibited display area provided on the inner peripheral side of the information recording area are provided in the same optical information recording layer. Since the pit data is formed at a predetermined position in the rewrite or write prohibition display area, recording in the prohibition display area can be easily controlled, and the predetermined recording is performed there. If it is, the user can directly visually confirm that rewriting or writing is prohibited, so it is possible to rewrite or write the recording without having to load the optical disk into the information recording and reproducing device and read the data. The convenience when handling a large number of discs or when recording quickly is greatly improved.

[Brief description of the drawings]

FIG. 1 is an external view of an embodiment of an optical information recording medium according to the present invention.

FIG. 2 is a partial detailed view of FIG.

FIG. 3 is an external view of another embodiment of the optical information recording medium according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk main body 2 Information recording area 3 Rewrite or write-protect display area 4 Through-hole 5 Pit data 6 Symbol mark

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Claims (3)

[Claims] An information recording layer is provided on a transparent substrate, an information rewrite or write-protect display area is provided, information can be recorded and reproduced by light, and a protective outer case is not provided around the transparent substrate. In an optical information recording medium,
The information recording area and the information rewrite or write prohibition display area are formed of the same optical information recording layer, and whether or not information rewrite or write prohibition is possible can be visually identified in the rewrite or write prohibition display area with visible light. An optical information recording medium formed on a substrate. 2. The optical information recording medium according to claim 1, wherein pit data serving as position data is provided when recording the rewrite or write prohibition information in the rewrite or write prohibition display area. 3. The optical information recording medium according to claim 1, wherein a symbol mark is provided around a rewrite or write prohibition display area.