JPH10105976A - Optical disc playback device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To perform reproduction control of an optical disk on which a legible shape is lost when copying and a visible pattern is formed. A pit pattern provided on an optical disc (4) has a different average optical reflectivity, and a boundary of a change in the average optical reflectivity causes a character or graphic pattern of a visually readable size to change. What is claimed is: 1. A reproducing apparatus for reproducing an optical disk having a character / graphic pattern display area configured to form an outline, wherein the reproduction is stopped if the pit pattern cannot be read as data from the character / graphic pattern display area. Deterrence means is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium, such as an optical disk or an optical card, for recording information by optical characteristics, and more particularly to a technique for preventing illegal copying of an information recording medium.

[0002]

2. Description of the Related Art As one of typical information recording media for recording information by giving optical characteristics, a CD-ROM (compact d), which is a kind of optical disk, is used.
issue only memory).

[0003] Many CD-ROMs use a CLV (constant) for recording data using pits at regular intervals.
(Line velocity) method.
In the CLV method, CAV (constant) recorded using pits at intervals determined according to the radial position of the CD-ROM so that the angle with respect to the center of the CD-ROM is always constant.
angular velocity) rather than C
The data capacity of the D-ROM can be increased. In addition, regardless of the CLV system and the CAV system, CD-RO
In M, a frame is used as a recording unit. As shown in FIG. 18, a frame 1 is composed of fixed-length data and a synchronization signal 2 added to the head.

It is also possible to mix the CLV system and the CAV system on one optical disk.

For example, in the technique described in Japanese Utility Model Publication No. 5-44927, a recording area according to the CLV method and a recording area according to the CAV method are provided on an optical disc, and still image data and the like are recorded in the recording area according to the CAV method. I have. Also, in the technology described in Japanese Patent Publication No. 5-33470, CL
A recording area according to the V method and a recording area according to the CAV method are provided, and the position of each recording area is separately recorded as address information. Then, this address information is stored in the CLV
It is used for switching the rotation control of the disk motor between the recording area according to the CAV method and the recording area according to the CAV method.

[0006] Now, CD-ROMs are widely used for recording digital data such as recording various software, document data and image data.

[0007] Such various kinds of software and document data recorded on a CD-ROM are usually under the protection of copyright, but the production and sale of an illegally copied version of the CD-ROM has been delayed until now. I did not refuse.

[0008] In particular, game software, books,
In the field of electronic publications such as dictionaries, illegal copies are often produced systematically, which has been a factor that hinders normal commercial transactions.

To manufacture a copy plate of such an optical disk such as a CD-ROM, a pit arrangement recorded on an information recording surface of the optical disk is molded by using a plastic material or the like, and an illegal copy is performed by using this method. It can be performed by producing a master of an optical disk of a plate. However, in this molding technique, it is necessary to remove the protective film of the optical disk and expose the pit array surface to form the mold, so that the shape of the pits is damaged in the process of removing the protective film, and accurate copying is performed. It is often not possible to produce a plate. In particular, it is extremely difficult to produce a copy plate of an optical disk having a strong protective film.

Therefore, usually, data of a regular optical disk is read, and a master of a copy plate optical disk is produced using the read data in the same manner as in the case of producing a regular optical disk.

On the other hand, in order to prevent the manufacture of such a copy-type optical disk, the copyright is conventionally displayed on the surface of the optical disk by engraving and printing characters, figures, and the like.

Further, as a conventional technique for determining a copy version of an optical disc, for example, the following technique is known.

That is, for example, the aforementioned synchronization signal 2
However, a technique described in Japanese Patent Application Laid-Open No. 4-286768 is known as a technique utilizing the fact that it cannot be read as data. In this technique, a part of the synchronization signal 2 described above is replaced in advance with another signal and recorded, and the presence or absence of the replacement signal is particularly detected at the time of reproduction. Judge as an illegal copy version.

In Japanese Utility Model Laid-Open No. 2-20884,
It is disclosed that a visible pattern is formed on the surface of a signal recording layer of an optical disc. In addition, Japanese Patent Application Laid-Open No.
Japanese Patent Application Publication No. JP-A-2005-17764 discloses that a visually recognizable pattern or the like is formed by changing a pit shape of a signal surface of an optical disc.

[0015]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 4-286 is disclosed.
According to the technology described in Japanese Patent No. 768, since the synchronization signal 2 itself including the replacement signal described above can be reproduced, it is not possible to manufacture an illegally copied optical disk storing the synchronization signal 2 including the replacement signal. Not so difficult.

According to the techniques described in Japanese Utility Model Laid-Open No. 2-20884 and Japanese Patent Laid-Open No. 2-17941, a process for forming characters, graphics, etc. is added separately in addition to a normal optical disk master manufacturing process. There is a need to.

Accordingly, the present invention provides an information recording medium on which a visually recognizable pattern is formed in which it is extremely difficult to reproduce the shape of an information recording medium of a copy plate, in which an original can be manufactured by the same manufacturing process as before. The purpose is to provide.

It is another object of the present invention to provide a reproducing apparatus capable of rejecting use of an information recording medium created by copying such an information recording medium.

[0019]

In order to achieve the above object, the present invention provides, for example, a pit pattern provided on a recording surface and formed on a plurality of tracks on the recording surface and corresponding to recorded data. An information recording medium, such as an optical disk, on which information is recorded by a specific data such that a pattern of a character or a figure of a size that can be viewed by a difference in light reflectance is presented in a pattern display area provided on a recording surface. Alternatively, the specific pit pattern corresponding to the data pattern has at least one region formed in a concentrated manner, an area provided on the previous recording surface, and the average light reflectance of the specific pit pattern is An information recording medium is provided, which is different from an average optical reflectance of an area around one area to a degree that can be visually recognized.

When the information recording medium is an optical disk, a memory for storing position information for specifying the position of the pattern display area of the optical disk, and a mounted optical disk are provided as a reproducing apparatus for reproducing the information recording medium. Reproducing means for reproducing data recorded on the optical disc; means for reproducing data from the area on the recording surface of the mounted optical disc, which is specified by the position information stored in the memory, via the reproducing means; A reproduction suppressing means for stopping the subsequent reproduction of the mounted optical disc when data cannot be reproduced from an area on the recording surface of the mounted optical disc specified by the information. I will provide a.

[0021]

According to the information recording medium of the present invention described above,
Characters and graphic patterns that can be viewed by intensively forming specific pit patterns corresponding to specific data or data patterns are represented on an information recording medium.

The arrangement of such pit patterns is deviated from the accuracy problem when data is copied to produce a copy board. In addition, it is extremely difficult to reduce the displacement to such an extent that the character and graphic patterns formed by the arrangement of the pit patterns are not significantly deformed. Therefore, it is extremely difficult to copy characters and graphic patterns existing on the original information recording medium to the copy disk in the same manner.

Further, according to the above-described reproducing apparatus, data is reproduced from an area of the loaded optical disc where character and graphic patterns exist, and if the data cannot be reproduced, subsequent reproduction of the loaded optical disc is performed. To stop. Therefore, even if a character or graphic pattern is formed on an optical disk by some other means than data copying, it cannot be reproduced and used. That is, such a copy board is rejected for use in the reproducing apparatus according to the present invention.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an information recording medium according to the present invention and a reproducing apparatus for reproducing the information recording medium will be described below, taking as an example the case where the information recording medium is a CD-ROM which is a kind of optical disk.

First, a first embodiment will be described.

FIG. 1 shows a signal surface of a CD-ROM according to this embodiment.

In this embodiment, visible characters and graphic patterns 14 are provided on the signal surface of the CD-ROM 4. The characters and the graphic patterns 14 are data stored on the CD-ROM, contents representing the copyright and copyright of the program, data stored on the CD-ROM, or the CD-R.
It indicates the trademark of the OM itself, other data stored on the CD-ROM, or the contents of rights concerning the CD-ROM itself. However, of course, other than this may be used.

Hereinafter, how to form the character and figure patterns will be described.

First, how the data is stored on the CD-R
A description will be given as to whether the information is recorded on the signal surface of the OM.

For example, a CD-ROM is a music CD.
EFM (right to fouree)
The data is modulated by the N modulation method and recorded on the signal surface by the CLV method.

That is, each 8-bit data shown in the left column of Table 1 is converted into a 14-bit EFM channel bit pattern shown in the right column of the table. Then, a 17-channel bit pattern is generated by adding 3 margin bits to the pattern, and this is used as a unit to be recorded on the CD-ROM.

[0032]

[Table 1]

Next, as shown in FIG. 2, a pattern of a small protrusion (pit) having a predetermined width and height determined according to the value of the channel bit pattern is formed on the signal surface of the CD-ROM. The master is prepared by forming a pit pattern for the master on a track to be formed by laser while rotating the master by a disk motor (spindle motor). The pit may be a small dent having a predetermined width and depth.

At this time, the data “1” of the channel bit pattern corresponds to the edge of each pit. For example, the 8-bit data “168” shown in Table 1 is replaced with “01”.
Since it is converted into an EFM channel bit pattern of "001001001001", the data "
1 ". Therefore, the 8-bit data" 16 "
The pit pattern corresponding to 8 ″ includes two pits having a length of 3T arranged at an interval of 3T, where T is the pit length corresponding to one channel bit.

On the other hand, similarly, the pit pattern corresponding to the data "89" includes a pit having a length of 11T. In addition,
In the EFM modulation method shown in Table 1, the shortest pit length is 3
T, the longest is 11T.

Next, the pit pattern was recorded on the CD-R
It is created on the signal surface of the OM. And C who created the pit
A light reflection film such as an aluminum thin film is deposited on the entire signal surface of the D-ROM, and a transparent protective layer is formed thereon.

In the CD-ROM prepared in this manner, the pit portion and the non-pit portion (land portion) have different light reflectivities. At the time of reproduction, a change in the channel reflectivity is caused by a change in the light reflectivity. Is playing and the data is playing.

In this embodiment, a character or graphic pattern which can be visually recognized on a CD-ROM is formed on a part of a signal surface by utilizing a difference in reflectance between a pit portion and a non-pit portion.

That is, due to the difference in reflectance between the pit portion and the non-pit portion, the average light reflectance differs between a certain pit pattern and a different pit pattern. Therefore, a certain pit pattern is collected into a desired character or graphic pattern shape, and a different pit pattern is arranged outside the character or graphic pattern.

In this embodiment, the pit pattern corresponding to the above-mentioned 8-bit data "168" and the data "8"
A pit pattern corresponding to 9 ″ is used.

FIG. 3 shows characters on the signal surface of a CD-ROM,
It is the figure which expanded a part of figure pattern. Here, the data constitutes a frame together with a synchronization pattern, information for error correction, and the like, and a pit pattern is created for this frame. Therefore, in practice, a bit pattern corresponding to a synchronization pattern or a channel bit of information for error correction appears between bit patterns corresponding to data. However, the ratio is small for the bit pattern corresponding to the data. Therefore, in FIG. 3, for clarity of description, it is assumed that a frame is composed of only pit patterns corresponding to data. Also, pit patterns corresponding to the above-mentioned margin bits are omitted.

In the illustrated example, one of the inside and the outside of the character / graphic pattern is constituted by a pit pattern corresponding to data "168" including a pit 142 having a length of 3T, and the other is constituted by a pit 143 having a length of 11T. , And a bit pattern corresponding to data “89”. As previously mentioned,
In the EFM modulation system, the shortest pit length is 3T and the longest is 1T.
Because it is 1T, the difference in reflectance between the two pit patterns is the largest.

In addition, two types of pit patterns corresponding to combinations of other data for realizing another pit pattern having a difference in reflectance that is visually insignificant may be used. Further, only one of the inside and the outside of the character or graphic pattern is constituted by specific data, preferably, a pit pattern corresponding to data in which the reflectance of the corresponding pit pattern is higher or lower than the average, and the other is random. It may be constituted by a set of pit patterns corresponding to a set of various data. This is because pits are visually extremely small, and a set of pit patterns corresponding to a set of random data is considered to exhibit an average reflectance as a set. Further, one of the inside and the outside of the character or graphic pattern may be constituted by a pit pattern corresponding to a combination of a plurality of specific data. Further, both the inside and the outside of the character or graphic pattern may be configured by pit patterns corresponding to different combinations of a plurality of specific data.

As described above, in this embodiment, the character and graphic patterns are formed using the pit patterns corresponding to the data used normally. Conversely, formation of a character or graphic pattern can be performed in the same manner as recording of normal data. However, it is necessary to create a pit pattern constituting a character or graphic pattern with high positional accuracy. Therefore, for example, when forming a master pit pattern on a master using a laser while rotating the master with a disk motor, strictly, using an encoder attached to the disk motor of the disk and other measuring means, The pit formation position is controlled to a desired position.

By doing so, the CLV method,
In any of the CAV methods, a CD-ROM on which a character or graphic pattern is formed can be created.

Now, from the CD-ROM on which characters and graphic patterns are formed by the CLV method in this manner,
Consider a case where a copy version of a CD-ROM is created.

Hereinafter, a CD-ROM created from an original disc is an original disc, and a CD created by copying the original disc
-Let the ROM be called a copyboard.

When an original master is manufactured, the master is traced by a laser while rotating the master by a disk motor as described above, and a pit pattern for the master is formed on the master. CD by format
When manufacturing a ROM master, the rotation speed of a disk motor for rotating the master is controlled as follows.

That is, a rotation speed defined by a predetermined reference frequency is set in the disk motor, and the rotation speed is set to a predetermined value in the radial direction so that the linear speed at which the laser traces on the master is constant. Control so as to increase at a rate. Then, the channel bits are read out one by one at a predetermined clock cycle, and a write signal for controlling the output of the laser is generated based on the value to create pits.

When the original disc is reproduced, the period of the signal reproduced by the optical pickup is made constant.
Control the rotation speed. Then, the channel bits and data are restored based on the value of the reproduction signal read by the optical pickup. As a result, the linear velocity increases at a predetermined rate in the outer diameter direction.

Also, in the production of the master of the copy disc, similarly to the production of the original disc described above, the rotational speed specified by the predetermined reference frequency is controlled so that the linear velocity at which the laser traces on the master is constant. Meanwhile, the channel bits reproduced from the original board are read out one by one at a predetermined clock cycle, and a write signal for controlling the output of the laser is generated based on the read out value, and pits are created.

Here, in order to prevent the pit interval from being shifted between the original disc and the copy disc, the linear velocity at which the laser traces the original disc and the write signal during the creation of the original disc master are set. The relationship between the clock cycle for generation, the linear velocity at which the laser traces on the master during the production of the copy master, and the clock cycle for generating the write signal must match. is there.

However, even if it is assumed that the clock periods for generating the write signal at the time of producing the original master and the master of the copy master are completely the same, the problem of the reference frequency and the accuracy of the rotation control is not satisfied. Therefore, it is impossible to completely match the linear velocities of the two. Therefore, the pit interval is shifted between the original disc and the copy disc.

Now, the difference between the clock periods for generating the write signal at the time of producing the original master and the copy master is also converted into the difference between the linear velocities at the time of manufacturing the master of the master and the copy master. The deviation of the pit interval is examined as a difference between the linear velocity at the time of reproducing the original record and the linear velocity at the time of producing the master of the master and the copy.

Now, FIG. 4B shows the positional relationship between _three tracks T ₁ , T ₂ and T ₃ which are sequentially adjacent on the CD-ROM (FIG. 4A). Points A, B, and C are respectively on track T
The pits on T ₁ , T ₂ , and T ₃ are arranged in a line in the vertical direction (radial direction), and form the contours of characters and graphic patterns.

Here, points A, B and C of the original board are
On the copy board, for example, point B moves relative to point B 'and point C moves relative to point C' based on point A.

The distance ΔL at which point B moves to point B ′ is determined from the time when the original master of the original disc rotates one revolution at a linear velocity V and the original master of the copy disc rotates at a linear velocity V + Δv from one revolution. Since it corresponds to the amount of deviation, it becomes as shown in equation (1).

ΔL = 2πR (Δv / v) (1) Here, R is the radius from the center of rotation of the disk to the track T ₁ .

Here, in the CD-ROM, the inner diameter R _{1 of the} signal surface on which data is recorded is 25 mm, and the outer diameter R ₂ is 58 mm.
Therefore, ΔL in the signal plane is ΔL = (15.7-36.4) × 10 ⁴ (Δv / v) (μm) (2)

The angle θ of the line segment AB ′ with respect to the rotation direction is given by θ = tan ⁻¹ (p / ΔL) (3) Where p is the track pitch and CD-R
In OM, it is 1.6 μm.

From this, the linear velocity deviation rate (Δv / v) is set to 1
Assuming × 10 ⁻⁴ , ΔL = (15.7-36.4) μ
m, θ = (5.8 to 2.5) degrees. That is, if the tracking linear velocity deviation rate is about 10 ⁻⁴ (0.01%), the character and graphic patterns on the original board are inclined almost horizontally on the copy board, and are hardly discernable.

The tracking linear velocity deviation rate (Δv /
If v) is 1 × 10 ⁻⁵ , θ = (45.5-23.
7) Degrees, and although characters and graphic patterns are inclined, they can be recognized somehow.

As described above, in order to form a character or graphic pattern on a copy board so as to be visible to the extent that it can be regarded as the same as the original board, it is assumed that the clock periods for generating the write signal completely match. Also, linear velocity deviation rate 1 × 1
0 ^-6 it is necessary to control the linear velocity below. That is, even a very slight difference in linear velocity is so large that characters, graphic patterns and the like cannot be identified.

However, it is technically extremely difficult to control the linear velocity at the time of making a master copy machine with such high accuracy. In addition, since the clock cycle for generating the write signal does not completely match, it is necessary to control the linear velocity with a higher precision in implementation.

In the standard of the CD of the CLV system including the CD-ROM, the tracking linear velocity is set to 1.2 to 1.4.
Since it is specified within a relatively gradual range of m / sec, it is impossible for the copy side to know the rotation speed at the time of creating and reproducing the original disc with an accuracy of 1 × 10 ⁻⁶ or less in advance.

Therefore, if it is intended to obtain a copy disk in which character and graphic patterns are formed well, a master copy disk is prepared while gradually changing the linear velocity with the accuracy of 1 × 10 ⁻⁶ or less. In addition, it is necessary to find a tracking linear velocity at which a character or graphic pattern appears. However, this is hardly realistic both technically and in terms of work efficiency.

Further, since the tracking linear velocity standard is gradual as described above, there is no problem even if there is fluctuation of the linear velocity below this standard value. Therefore, when the rotation speed is controlled so that the period of the signal reproduced by the optical pickup from the original disc during production of the master disc of the original disc is constant, the linear velocity is intentionally controlled within a range in which the fluctuation within the standard occurs. The pit interval may be made to have a random fluctuation. By doing so, it is impossible to form a character or graphic pattern satisfactorily unless a fluctuation corresponding to the fluctuation is given to the linear velocity at the time of producing the master of the copy disk.

As described above, according to the present embodiment, the original CD-R of the CLV system in which the character and graphic patterns are formed
Copy-format CD-R using reproduction signal obtained from OM
When the OM is manufactured, the characters and the graphic patterns 14 are distorted or disappear on the copy plate. As a result, CD-
Without examining the reproduction content of the ROM, the presence or absence of the characters and the graphic patterns 14 makes it possible to visually identify that the CD-ROM is an illegal copy version. Heretofore, labeling and engraving of characters and graphic patterns on the original board have been performed, but such mechanically provided character and graphic patterns are extremely easy to copy. On the other hand, since the character and graphic patterns according to the present embodiment are formed using the pit pattern on the signal surface, it is extremely difficult to copy as described above.

Hereinafter, a second embodiment of the present invention will be described.

In the present embodiment, the CLV
An area for forming pits by the CAV method is provided in a partial area of the CD-ROM of the system, and a character and a graphic pattern are formed in this area as described above.

Data is recorded in the area other than the area where characters and graphic patterns are formed on the CD-ROM by the CLV method as usual. Here, in order to copy the data of the original board, if a copy board is simply manufactured by the CLV method, characters and graphic patterns formed by the CAV method on the CLV original board are also copied by the CLV method. .
As a result, the character and graphic patterns recorded in the CAV format so that they can be viewed are stored in the CD-ROM according to the first embodiment.
Similarly to the above, due to the change in the linear velocity, the deformation is remarkably deformed on the copy disc, making it invisible and disappearing.
In order to produce a copy disc by the CAV method only for an area corresponding to the area of the original disc by the CAV method, detection of the area by the CAV method of the original disc and C
It is difficult because it involves detection of the angular velocity of the area by the AV method, rotation control and write cycle control suitable for the detected content. Therefore, according to the second embodiment, as in the first embodiment, the CD-R is determined based on the presence / absence of the characters and the graphic patterns 14 without checking the reproduction contents of the CD-ROM.
It becomes possible to visually identify that the OM is an illegal copy version.

FIG. 5 shows an arrangement and a linear velocity of a CLV data recording area and a CAV text and graphic pattern area of the original board according to this embodiment. In the figure,
The horizontal axis R is the distance (radius) measured from the center of rotation of the disk,
The vertical axis is the linear velocity v that tracks the track at that distance.
It is.

In FIG. 5, the portion where the linear velocity is constant is CL
In the V system, the portion where the linear velocity increases from the inner periphery to the outer periphery is the CAV system.

As shown in the figure, several methods are conceivable for inserting the CAV method into the CLV method, but the method of following CLV1-CAV1-CLV2 shown by a solid line is as follows.
Since the CLV area and the CAV area are connected without a linear velocity gap, data can be continuously and smoothly recorded even at the boundary between the two areas, and the data can be easily reproduced and the rotation speed can be easily controlled.

On the other hand, CLV1-C shown by a dotted line
In the method of tracing AV2-CLV3, CLV1-CAV3-CLV4, etc., there is a deviation of the tracking linear velocity between the CLV area and the CAV area, so it is necessary to rapidly change the rotation speed of the disk at this boundary. The same applies to reproduction. However, since a large tracking linear velocity difference can be set between the CLV and CAV areas, character and graphic patterns can be reliably erased on the copy board. In addition, as described later, it becomes possible to determine whether the disc is an original disc or a copy disc based on the presence or absence of the CAV area in the reproducing apparatus.

In the same manner, on the contrary, the CAV type C
A region where a pit pattern is formed by the CLV method may be provided in the D-ROM, and a character or graphic pattern may be formed here. The same effect can be obtained by this.

Next, a third embodiment will be described.

In the third embodiment, a plurality of regions for forming character and graphic patterns are provided by the CAV method shown in the second embodiment, and the angular velocities of the CAV regions are different from each other. This makes it possible to detect the area of the original disc by the CAV method and the angular velocity of the area by the CAV method to produce a CD-ROM having the same area configuration as that of the original disc. Is significantly increased, so that the copy protection effect can be further enhanced.

FIG. 6 shows the relationship between the arrangement of a plurality of CAV regions and the linear velocity.

FIG. 6A shows a plurality of CAV regions CAV4,
In this case, the CAV 5 and the like are provided separately in the radial direction of the disk 4, and the linear velocities of each CAV area and the CLV area are connected as shown by a solid line or a dotted line in FIG.

FIG. 6B shows a plurality of CAV areas CAV6 to CAV6.
This is a case where CAV8 and the like are provided adjacent to the disk 4 in the radial direction.
The linear velocities between the LV regions CLV5 and CLV6 are connected, for example, as shown by a solid line or a dotted line in FIG.

FIG. 6 (c) shows a plurality of CAV areas CAV9 to CAV1 by dividing a circular band-shaped area in the circumferential direction.
This is the case where 1 and the like are provided. Each CAV area CAV9, CA
The linear velocities of V10 and CAV11 are connected, for example, as shown by a solid line or a dotted line in FIG. 8, and return to the original linear velocity every round. Note that the lengths (angles) of the CAV regions do not necessarily have to be equal, and a CL
The V portion can be inserted as appropriate. FIG.
In (a) and (b), there is no need to make the angular velocities of the respective CAV regions different from each other, and CAV regions having the same angular velocity may exist.

Note that characters and graphic patterns are recorded on the original board in a CAV system so that they can be viewed.
Even in the case of copying using the V method, the image cannot be visually recognized unless the image is copied at the same angular velocity (deviation rate of 1 × 10 ⁻⁶ or less) as that of the original record. Detects the CD- on which the character and graphic patterns are formed
Even if a ROM is to be manufactured, the same difficulties as in the first embodiment are involved.

Hereinafter, a fourth embodiment will be described.

In the fourth embodiment, a region for forming a character or graphic pattern by the CLV or CAV method is used for the CD-ROM.
It is provided outside the data area (program area) of the ROM, and the data recording capacity is secured by that amount.

FIG. 9A is a sectional view of a CD-ROM.

In FIG. 9A, data is transferred from the position of the program start diameter (φ50) toward the outer periphery.
It is sequentially recorded up to a position not exceeding the program maximum diameter (φ116) at the maximum. Therefore, when the data amount is small, the outer diameter of the program area in which data is recorded is inside the maximum diameter of the program, and this is called a program out diameter. An area called a lead-out area for recording “0” data is provided outside the program-out diameter.

Also, T outside the lead-in start diameter
An OC (table of content, which records data index information and the like in the program area) is provided, and this is called a lead-in area.

Normally, both the inside of the lead-in area and the outside of the lead-out area are mirror surfaces. Since there are no pits on the mirror surface, the optical pickup cannot perform a focusing operation or a tracking operation in this region.

In this embodiment, characters and graphic patterns are
A region formed by the V or CAV method is provided on at least one of the inside of the lead-in region and the outside of the lead-out region.

In the case where the lead-out area is provided outside the lead-out area, as shown in FIG.
Outside is small enough to contain characters and graphic patterns.
In practice, it is preferable to set the program-out diameter to φ111 and provide the lead-out area inside the lead-out diameter (φ117) and provide an area for forming a character or graphic pattern outside the lead-out area.

Further, a thin mirror surface area may be provided outside the lead-out area, and an area for forming a character or graphic pattern may be provided outside the thin mirror area. Alternatively, a thin mirror surface area may be provided inside the lead-in area, and an area for forming a character or graphic pattern may be provided inside the thin mirror area.

In the conventional reproducing apparatus, the data read operation cannot be performed while jumping over the mirror surface outside the lead-out area. Therefore, when the mirror surface portion is provided, the character and graphic pattern data outside the mirror surface portion are not read. Therefore, since the character and graphic pattern data are not recorded on the copy plate, as described later, if the reproduction device determines the presence or absence of the character and graphic pattern from the data reproduced from the area at the time of reproduction, the reproduction device will It is possible to distinguish between a version and a copy version.

Hereinafter, a fifth embodiment will be described.

The fifth embodiment relates to the CD according to the fourth embodiment.
-Reproducing apparatus for reproducing ROM.

FIG. 10 shows a configuration of a reproducing apparatus according to this embodiment.

In the figure, a CD-RO is
The reproduction signal read from M4 is amplified and waveform-equivalent by the preamplifier 6, EFM-demodulated by the CD digital signal processing unit 408, and sent to the CD-ROM controller 409. The CD-ROM controller 409 sends the data to the host system 410 after error correction of the received data and restoration to the original data array. here,
Actually, the channel bit pattern recorded on the CD-ROM is obtained by subjecting the scrambled data sequence and the error correction code to EFM modulation. However, the channel bit pattern used when forming a character or graphic pattern is
It is not always necessary to create the data by scrambling, but it may be created directly as a channel bit pattern to be recorded on a CD-ROM. When a character or graphic pattern is formed by a pit pattern of a channel bit pattern in which a scrambled data string and an error correction code are EFM-modulated, an original data string is created in consideration of the contents of the scramble.

Here, in the reproducing apparatus according to the present embodiment, a music CD can be used. When playing back a music CD, the CD-ROM controller 409 gives the restored data to the D / A circuit 411. The D / A circuit 411 is
The given data is converted into an analog signal and output.

Also, the CD-ROM controller 409
Is controlled by the servo circuit 4 via the access control unit 405 based on an access command from the host system 410.
The servo operation of the optical pickup 3 and the moving operation of the optical pickup 3 by the pickup feeding device 406 are controlled.

In such a reproducing apparatus, the servo of the rotation of the disk motor 11 is performed by the servo circuit 404 as follows.

FIG. 11 shows the configuration of the rotary servo system of the servo circuit 404.

The synchronization detector 5 extracts the above-mentioned synchronization signal from the reproduced signal amplified and waveform-equalized by the preamplifier 6.
The fV converter 7 converts the synchronization signal into a voltage proportional to the frequency. The phase comparator 8 converts the frequency of the synchronization signal to a crystal 9
The phase is compared with the oscillation frequency (reference frequency), and an error signal proportional to the phase shift is sent to the adder circuit 10 and the fV converter 7
Correct the output of. The output of the adder circuit 10 is appropriately amplified and sent to the disk motor 11 to control the number of revolutions. The actual rotation speed of the disk motor 11 is detected by a rotation speed detector 412 and sent to the CD-ROM controller 409. The rotation speed detector 412 can be realized by a tacho generator or an encoder attached to the disk motor 11.

With this configuration, the rotation speed of the disk motor 11 is controlled so that the synchronization signal frequency is kept constant. Here, if the frequency of the synchronization signal read from the CAV region is within the synchronization pull-in range of the phase comparator 9, the rotation speed of the disk motor 11 is related to the CLV method and the CAV method, and the synchronization signal frequency is constant. Can be controlled to be maintained at

As a result, in the CLV system, the disk motor 1
The rotation speed of the track 1 is controlled so as to decrease as it goes from the inner circumference to the outer circumference, so that the linear velocity of the track is kept constant. Further, in the CAV method, the rotation speed of the disk motor 11 is controlled to be always constant. Here, in the second to fourth embodiments, the CLV-type CD-ROM is used.
The angular velocity used in the CAV method is determined in consideration of the synchronization pull-in range of the phase comparator 9 so that the present apparatus can also reproduce an area in the ROM where character and graphic patterns are formed by the CAV method. ing.

The CD-ROM according to the fourth embodiment will now be described.
At the time of production, TOC (Table of content
ts) Information as to whether the disc is a music CD
-ROM identification information is recorded. Also, TO
C Volume and file structure of CD-ROM for program JIS information exchange recorded after program C (JIS
X0606-1990), a predetermined password indicating the authorized provider of the CD-ROM is stored in an area (system area or the like). The password may be encrypted and stored.

On the other hand, the memory in the CD-ROM controller 409 of the reproducing apparatus stores the C-ROM according to the fourth embodiment.
The password used by the authorized provider of the D-ROM and the information on the position of the area where the characters and the graphic patterns are formed on the CD-ROM provided by the authorized provider are stored. The information on this position is, for example, the distance from the lead-out area of the area where the character and graphic patterns are formed.

Note that the password is encrypted and the CD-RO
M, the CD-ROM controller 40
9 is provided with means for decrypting the encrypted password.

The reproducing apparatus according to the present embodiment detects the presence or absence of an area in which a character or graphic pattern recorded outside the lead-out area is formed, and the CD-ROM to be reproduced from this area is the original version. A judgment is made as to whether it is a copy version or a copy version. The characters and graphic patterns may be formed by either the CLV method or the CAV method.

FIG. 12 and FIG. 13 show the procedure of the reproducing process performed by the reproducing apparatus.

As shown, the CD-ROM of the playback device
When a new CD-ROM is mounted, the controller 409 executes the processing shown in FIG.

That is, in step 502, the TOC (Table of contents) information of the disc is read to check the lead-out position, and in step 503, it is determined whether the disc is a music CD or a CD-ROM. Music C
If it is D, the music C for giving the reproduction data to the D / A circuit
D is reproduced.

In the case of a CD-ROM, step 504
Then, the contents of the area (system area, etc.) defined by the volume and file structure (JIS X0606-1990) of the CD-ROM for program JIS information exchange recorded after the TOC are checked.
The password of the provider of M is searched, and it is checked in step 505 whether the password matches the password stored in the memory in the CD-ROM controller 409. The disk bit flag is set, and the process ends. Step 5
If the passwords do not match in 05, the process proceeds to step 507 to clear the dedicated bit flag and terminate the process.

When the processing shown in FIG. 12 is completed, the CD-R
Next, the OM controller 409 executes the processing shown in FIG. However, if it is determined in step 503 that the mounted disc is a music CD, FIG.
3 is not executed.

That is, first, in step 602, the dedicated disk bit flag is determined. If the flag is set, the process proceeds to step 1701 and the subsequent steps. If the dedicated disk bit flag is cleared, the process proceeds to step 602.
In step 3, as in the prior art, processing according to the contents of the disc is performed. Alternatively, if the dedicated disk bit flag is cleared, that is, if the passwords do not match, the disk can be made unusable by ejecting the disk or the like.

In step 1701, a process of reading out the area is performed by referring to the information on the position of the area where the character and graphic patterns are formed, which is stored in the internal memory in advance. At this time, even if there is a mirror surface area inside this area, an area where characters and graphic patterns are formed is read beyond this area. And step 170
In step 2, it is determined whether or not data exists in the character / graphic pattern recording area. If so, it is determined that the data is a regular CD-ROM. Thereafter, the CD-ROM is reproduced and the data is sent to the host system. (Step 610).

On the other hand, if there is no data in the character / figure pattern recording area, it is displayed that the CD-ROM is a copy version, the CD-ROM is ejected,
By stopping the reproduction operation, this CD-RO
Make M unavailable (step 612). As a result of such processing, a copy disc obtained by fully copying the original disc cannot be used in the playback device.

In a normal reproducing apparatus, the read operation is not performed after the lead-out position obtained in step 502.

Hereinafter, a sixth embodiment will be described.

The sixth embodiment is different from the CD-ROM according to the second and third embodiments or the CD-ROM according to the fourth embodiment.
CD-R with character / graphic pattern formed by AV system
This is for a playback device that plays back OM.

That is, the sixth embodiment targets a CD-ROM in which character and graphic patterns are formed by the CAV method.

Now, the configuration of the reproducing apparatus according to this embodiment is as follows.
The configuration is the same as that of the playback device according to the fifth embodiment. However, in the present embodiment, it is determined whether or not the character and graphic patterns are recorded by the CAV method. Generally copy CLV
Since it is difficult to manufacture a copy disc in which the system and the CAV system are mixed, in the present embodiment, if a character or graphic pattern is recorded by the CAV system, it is determined to be an original disc.

For this reason, when the processing shown in FIG. 10 ends, the CD-ROM controller 409 next proceeds to FIG.
The processing shown in FIG. 14 is executed instead of the processing shown in FIG. However, if the mounted disk is determined to be a music CD in step 503, the processing shown in FIG. 14 is not executed.

That is, first, in step 602, the dedicated disk bit flag is determined. If the flag is set, the process proceeds to step 604 and the subsequent steps. If the dedicated disk bit flag is cleared, step 603 is performed.
In the same manner as before, the processing according to the contents of the disc is performed.

In step 604, the track m in the character / graphic pattern recording area is accessed with reference to the information on the position of the area where the character / graphic pattern is formed, which is stored in the internal memory in advance. Then step 6
At 05, the rotational speed at the time of reading the track m is detected via the rotational speed detector 412.

The optical pickup 3 is controlled to make a reverse jump of one track during one rotation (to keep tracking the same track), and from the reproduction timing of a specific data pattern, By measuring the time elapsed until the pattern is reproduced, the time required for one rotation can be measured, and the rotation speed can be detected. In this case, as the specific data pattern, a data pattern corresponding to a characteristic portion of a character or a figure can be used. When the rotational speed is detected in this manner, the data pattern of this characteristic portion should be stored in the memory of the playback device in association with the password in the memory of the disk. Good.

Next, at step 606, an arbitrary track n different from the track m in the character pattern recording area is accessed, and at step 607, the rotation speed of the track n is similarly detected.

In step 608, the rotational speeds of the track n and the track m are compared. If they match, the process proceeds to step 609, where the character and graphic pattern
It is determined that the CD-ROM is a legitimate CD-ROM recorded in the system, and the process proceeds to step 610. In step 610, the CD-RO
Play M and send data to host system.

On the other hand, when the rotation speeds of the track n and the track m do not match, it is displayed that the CD-ROM is a copy version, the CD-ROM is ejected, or the reproducing operation is stopped. This CD-ROM
Is made unavailable (steps 611 and 612).

As a result of such processing, the original board on which characters and graphic patterns are formed by the CAV method is
A copy board that has been full-copied in the V system cannot be used in a playback device.

In the above processing, it is desirable that the track n and the track m are located as far as possible from each other in the area of the character and graphic patterns. This is because it is possible to reliably determine whether the rotational speeds match or not.

The number of tracks for detecting the rotation speed is
The number of copies may be increased more than two to more reliably determine whether or not the disc is a copy disc. For example, the rotation speeds of all the tracks in the character and graphic pattern area may be detected to determine whether the detected values match or not.

Hereinafter, a seventh embodiment of the present invention will be described.

The present embodiment relates to a reproducing apparatus for judging a copy board from the value of data corresponding to a pit pattern forming a character or graphic pattern.

The attitude device according to the present embodiment has the same configuration as the playback device according to the fifth embodiment. However, CD-
In the ROM controller 409, a data pattern obtained by reproducing an area in which a character and a graphic pattern are formed is stored in advance as a collation data pattern. FIG.
When the processing shown in FIG. 0 is completed, the CD-ROM controller 409 next executes the processing shown in FIG. 15 instead of the processing shown in FIG. However, if the disc mounted in step 503 is determined to be a music CD, the processing shown in FIG. 15 is not executed.

In the processing shown in FIG. 15, first, at step 602, a dedicated disk bit flag is determined. If the flag is set, the process proceeds to step 704 and subsequent steps, and if the dedicated disk bit flag is cleared. For example, in step 603, processing according to the contents of the disc is performed as in the related art.

In step 704, data of the character / graphic pattern recording area is read out with reference to information on the position of the area where the character / graphic pattern is formed, which is stored in the internal memory in advance. At step 706, a data pattern for collation stored in advance in the internal memory is read out.
The data pattern read in step 04 is compared with the data pattern read in step 705. If the collation results match, the process proceeds to step 707, where the disc is determined to be the original version, and the process proceeds to step 708. At step 708, the CD-ROM is reproduced and the data is sent to the host system.

On the other hand, if they do not match, the CD-R
Indicate that the OM is a copy version or use a CD-ROM
By discharging or stopping the regeneration operation,
This CD-ROM is made unusable (step 70)
9, 710).

As a result of such processing, a copy disk in which characters and graphic patterns are formed on a CD-ROM by a method such as printing to make it look like an original disk can no longer be used by a reproducing apparatus.

In the above processing, the data pattern for comparison stored in the memory of the CD-ROM controller 409 in advance is the entire data pattern obtained by reproducing the area of the CD-ROM where character and graphic patterns are formed. Instead of this, only a data pattern corresponding to a characteristic portion in a character or graphic pattern may be used.

That is, for example, only a data pattern corresponding to a characteristic portion in a character or graphic pattern as shown in FIG. 16 may be stored, and only this portion may be compared to make a determination. .

Incidentally, in the example shown in FIG.
If only the contents of the track 1, the track 802, and the track 803 are collated, a data pattern corresponding to the characteristics of the character and graphic patterns can be obtained.

Since data patterns for the entire circumference of these tracks are not required for feature comparison, only sectors corresponding to the characteristic portions of the character and graphic patterns may be read and compared. Here, one sector is composed of a predetermined number of frames, and each sector is given a sector number for identifying the sector. In this case, the tracks 801 and 80 required to access the sector corresponding to the characteristic portion of the character or graphic pattern
Track numbers such as 2,803 and sector numbers are CD-
It should be stored in the memory in the ROM 409 in advance.

The data pattern stored in the memory of the CD-ROM 409 in advance may be a data pattern that has been subjected to encryption and encoding processing, so that the memory capacity may be reduced.

The embodiment of the optical disk and the reproducing apparatus according to the present invention has been described above in the case where the information recording medium is a CD-ROM.

However, in each of the above embodiments, the CD-ROM
In addition, the present invention can be similarly applied to other information recording media for recording information by giving optical characteristics, for example, CDs, mini disks, optical disks, and magneto-optical disks. Further, for example, the present invention can be applied to a non-disk type information recording medium such as an optical card.

Here, an example of application to an optical card will be described.

FIG. 17 shows the principle of recording / reproducing on an optical card.

As the recording / reproducing method of the optical card, a card rotating type shown in FIG. 17A, a head rotating type shown in FIG. 17B, a card reciprocating type shown in FIG. There is a beam scan type shown in FIG.

The card rotating type and the head rotating type shown in FIG. 13B differ only in the shape of the storage medium, and are different from the CD-RO type.
It is essentially the same as M. Therefore, the above embodiments can be applied to these systems as they are.

In the card reciprocating motion type and the beam scan type, a character or figure pattern which is difficult to reproduce by copying can be formed by a pit pattern corresponding to data.

The embodiments of the present invention have been described.

As described above, according to the embodiment of the present invention,
It is possible to obtain an optical disk such as a CD-ROM on which visible characters and graphic patterns relating to trademarks and copyrights are formed.

Further, when a copy version of the optical disk is manufactured from the original version of the optical disk, the character and graphic patterns are distorted or become invisible. That is,
The copyboard is immediately visually identified. Thus, the effect of suppressing illegal copying can be expected.

Further, by dividing the recording area of the character and graphic patterns, the distortion of the character and graphic patterns on the copy plate optical disk and the invisible portion can be further revealed. Furthermore, by recording each character and figure pattern on the outer periphery of the program-out diameter of the information recording optical disc or the inner periphery of the lead-in start diameter of the information recording optical disc, the information recording capacity of the optical disc is not impaired. , Characters and graphic patterns can be recorded.

Further, a password is recorded on the optical disc, and the reproducing apparatus identifies the copy plate from the password and the information of the character and graphic pattern areas, and makes the copy plate unusable.

The reproducing apparatus identifies the copy plate based on whether the character / figure pattern recording area is recorded by the CAV method based on the tracking linear velocity, and makes the copy plate unusable. Further, the data read from the character and graphic pattern areas is checked to identify the copy plate, and this is made unusable.

In the field of CD-ROM publications such as games and dictionaries, a specialized playback device is usually used. Therefore, if the reproducing apparatus according to the present embodiment is used for this, an optical disk by illegal copying cannot be used, so that it is expected to exert an effect of suppressing the illegally copied optical disk from traversing.

Further, the same effect as that of the optical disk can be obtained by recording the same character and graphic patterns on various types of optical cards.

[0159]

As described above, according to the present invention, an original plate can be manufactured by the same manufacturing process as before, and a visually recognizable pattern is formed in which it is extremely difficult to reproduce the pattern shape by copying. Thus, it is possible to provide a reproducing apparatus that refuses to use an information recording medium created by copying this information recording medium.

[Brief description of the drawings]

FIG. 1 is a diagram showing an appearance of a CD-ROM according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a shape of a pit pattern of a CD-ROM according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a pit pattern of a CD-ROM according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a pit shift that occurs when copying a CD-ROM according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a radial position of a track of a CD-ROM and a linear velocity according to a second embodiment of the present invention.

FIG. 6 is a diagram showing an arrangement of character and graphic pattern areas on a CD-ROM and a storage method thereof according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a relationship between a radial position of a track of a CD-ROM and a linear velocity according to a third embodiment of the present invention.

FIG. 8 is a diagram showing a relationship between a radial position of a track of a CD-ROM and a linear velocity according to a third embodiment of the present invention.

FIG. 9 is a diagram showing an arrangement of a character / graphic pattern area and a mirror surface portion of a CD-ROM according to a fourth embodiment of the present invention.

FIG. 10 is a block diagram illustrating a configuration of a playback device according to a fifth embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of a rotary servo system of a servo circuit according to a fifth embodiment of the present invention.

FIG. 12 shows a CD-ROM of a reproducing apparatus according to a fifth embodiment of the present invention.
4 is a flowchart illustrating a procedure of a process performed by a ROM controller.

FIG. 13 shows a CD-ROM of a reproducing apparatus according to a fifth embodiment of the present invention.
4 is a flowchart illustrating a procedure of a process performed by a ROM controller.

FIG. 14 shows a CD-ROM of a reproducing apparatus according to a sixth embodiment of the present invention.
4 is a flowchart illustrating a procedure of a process performed by a ROM controller.

FIG. 15 shows a CD-ROM of a reproducing apparatus according to a seventh embodiment of the present invention.
4 is a flowchart illustrating a procedure of a process performed by a ROM controller.

FIG. 16 shows a CD-ROM of a reproducing apparatus according to a seventh embodiment of the present invention.
It is a figure which shows the example of the character part of the character and graphic pattern used for ROM controller Kasumasa.

FIG. 17 is a diagram showing a recording / reproducing method of an optical card.

FIG. 18 is a diagram showing frames recorded on a CD-ROM.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame 2 ... Synchronous signal 3 ... Pickup 4 ... Optical disk 5 ... Synchronous signal detector 6 ... Preamplifier 7 ... fV converter 8 ... Phase comparator 9 ... Crystal oscillator 10 ... Adder 11 ... Disk motor 14 ... Character, Graphic pattern 142 3T pit 143 11T pit 404 Servo circuit 405 Access controller 406 Pickup feeder 408 CD signal processor 409 CD-ROM controller 410 Host system 412 Rotation speed detector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 20/12 G11B 20/12 (72) Inventor Hiroshi Banno 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi, Ltd. Information Video Media Division (72) Inventor Takashi Takeuchi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Hitachi, Ltd.

Claims (6)

[Claims] A pit pattern provided on an optical disc has a different average optical reflectivity, so that a boundary of a change in the average optical reflectivity allows a character or graphic pattern of a visually readable size to be formed. An optical disc reproducing apparatus for reproducing an optical disc having a pattern display area presenting a character or graphic pattern of a visually readable size configured to form an outline, wherein the pit pattern is used as data from the pattern display area. An optical disc reproducing apparatus comprising a reproduction suppressing means for stopping reproduction when the data cannot be read. 2. An optical disk reproducing apparatus for reproducing an optical disk having a recording surface and recording information by a pit pattern formed on a plurality of tracks on the recording surface, wherein the optical disk has a predetermined number of tracks. It has a pattern display area that presents a character or figure pattern of a size that can be viewed over the entire area, and the pattern display area has an average optical reflection of a specific pit pattern in each track that constitutes the pattern display area. By making the average optical reflectivity of the pit pattern of the pattern display area and the peripheral area thereof different from each other by the pit pattern having substantially the same pit pattern, by the boundary where the average optical reflectivity changes, The pattern display is configured to form a contour of a character or graphic pattern of a size that can be viewed. A memory for storing position information for specifying the position of the area; a reproducing unit for reproducing data recorded on the mounted optical disc; and a reproduction unit, which is specified by the position information, from the pattern display area via the reproducing unit. An optical disc reproducing apparatus, comprising: a reproduction suppressing unit for stopping subsequent reproduction of the mounted optical disc when data cannot be reproduced. 3. An optical disk reproducing apparatus for reproducing an optical disk having a recording surface and recording information by a pit pattern formed on a plurality of tracks on the recording surface, wherein the optical disk has a predetermined number of tracks. It has a pattern display area that presents a character or graphic pattern of a size that can be seen over the entire area, and the pattern display area has an average optical reflection of a specific pit pattern in each track constituting the pattern display area. The pit pattern is composed of almost the same pit pattern, and by changing the average optical reflectance of the pit pattern in the pattern display area and the pit pattern in the peripheral area, by the boundary where the average optical reflectance changes, Form a contour of a character or graphic pattern of visible size, and further form the pattern or region in the pattern display area. The pit pattern is a CAV (Constant Angular Velocity) that keeps the rotation speed of the optical disc constant.
The pit pattern is formed according to a method, and formed in an area on the recording surface other than the pattern display area,
CLV for keeping the tracking linear velocity of the track constant
(Constant Line Velocity) method, rotating means for rotating the loaded optical disc, optical pickup for tracing the track of the optical disc and detecting the pit pattern formed on the track, and detecting the pit pattern Rotation control means for controlling the rotation speed of the rotation means so that the frequency is constant, rotation speed detection means for detecting the rotation speed of the rotation means, and position information for specifying the position of the pattern display area of the optical disk A means for accessing at least two tracks of the pattern display area specified by the position information stored in the memory; and a method for accessing the at least two tracks detected by the rotation speed detecting means. Specified by the position information stored in the memory from the rotation speed of the rotation means. Reproduction inhibiting means for judging whether or not a pit pattern is formed in the pattern display area according to the CAV method, and if not, stopping the subsequent reproduction of the mounted optical disk. An optical disc reproducing apparatus characterized by the above-mentioned. 4. An optical disk reproducing apparatus having a recording surface and reproducing an optical disk on which information is recorded by a pit pattern formed on a plurality of tracks on the recording surface, wherein the optical disk has a predetermined number of tracks. It has a pattern display area that presents a character or figure pattern of a size that can be viewed over the entire area, and the pattern display area has an average optical reflection of a specific pit pattern in each track that constitutes the pattern display area. By making the average optical reflectivity of the pit pattern of the pattern display area and the peripheral area thereof different from each other by the pit pattern having substantially the same pit pattern, by the boundary where the average optical reflectivity changes, The pattern display is configured to form a contour of a character or graphic pattern of a size that can be viewed. Position information for specifying the position of the area; memory for storing predetermined collation data; reproducing means for reproducing data recorded on the mounted optical disc; and the position information specified by the position information stored in the memory. Data is reproduced from the pattern display area via the reproducing means, and the reproduced data is compared with the collation data stored in the memory. If the two data do not match,
An optical disc reproducing apparatus, comprising: a reproduction suppressing unit for stopping subsequent reproduction of the mounted optical disc. 5. The optical disk reproducing apparatus according to claim 2, wherein said memory stores a predetermined collation password, and said reproduction suppressing means stores the password reproduced from the mounted optical disk and said password. An optical disc reproducing apparatus, which determines whether or not to stop subsequent reproduction of a mounted optical disc according to whether or not a verification password stored in a memory matches. 6. An optical disk reproducing apparatus having a recording surface and reproducing an optical disk on which information is recorded by a pit pattern formed on a plurality of tracks on the recording surface, wherein the optical disk has a predetermined number of tracks. It has a pattern display area that presents a character or figure pattern of a size that can be viewed over the entire area, and the pattern display area has an average optical reflection of a specific pit pattern in each track that constitutes the pattern display area. By making the average optical reflectivity of the pit pattern of the pattern display area and the peripheral area thereof different from each other by the pit pattern having substantially the same pit pattern, by the boundary where the average optical reflectivity changes, The pattern display is configured to form a contour of a character or graphic pattern of a size that can be viewed. The area is provided on the outer peripheral side of the lead-out area indicating the end position of the data recording area, and a mirror area free of pits is provided between the pattern display area and the lead-out area. An optical disc, comprising: an optical pickup for tracing a track on the optical disc to detect a pit pattern formed on the track; a memory for storing position information for specifying a position of the pattern display area; A reproducing means for reproducing data recorded in the optical pickup; and a reproducing means for controlling the optical pickup so as to reproduce data from the pattern display area specified by the position information beyond the mirror area through the reproducing means. An optical disk reproducing device comprising a control unit.