JP2003323746A - Optical recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To optically visualize image information on an information recording surface. <P>SOLUTION: Tracks and recording bits are formed spirally or concentrically on a disk base. By changing the track width/pitch or bit width/length, an optical interference is generated and the information is visualized and displayed by the optical interference. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium in which visualization information such as an image is displayed on an information recording surface.

[0002]

2. Description of the Related Art Conventionally, as an optical information recording medium capable of recording an information signal or reproducing the recorded information signal, an optical disk, an optical card and the like are known. Common names are CD, DVD, CD-R, CD-R
There are things such as W. On the information recording surface of such an optical disc, information signals are recorded along spiral tracks at equal intervals in the system direction of the disc.

These CD (Compact Disc) and DVD (Di
gital Versatile Dlsc) is a recording medium that enables mass copying from the master and mass distribution.
Those that have recorded the same music and copyrighted material data such as video information have basically the same form, and each one is distributed by being housed in a container having a common form and design. .
In addition, at present, it is possible to easily copy from a CD because it is possible to personally plan for a CD-R or a CD-RW, and the recorded data has basically the same form.

[0004]

Therefore, when the optical disk is judged as an individual one by visualization, a method of printing on a label or a direct transfer method at the time of pressing has been used. For example, the visual image judgment is performed as an authentication function for printing music such as music on a label, images, and game software. Since this was a copy on a part without information such as the label side, it can be edited freely, but the information recording part of the information recording side basically only serves as the recording part, The principle was not to touch.

Even if a character or a picture can be written on the information-free area of the information recording surface, there is a problem that a signal cannot be read when the picture or the character is written on the information recording section. That is, it can be said that there was no exterior value in the information description section.

As described above, in order to identify what is called a package medium that is commonly stored and distributed as independent recording media in which common copyrighted material data is recorded, the storage medium and the recording medium that store the recording medium are identified. A serial number is printed on the printed matter that is attached and stored in the storage body, or a sticker on which a serial number is printed is attached.

Further, at present, since the disc duplication technology has been developed, it is difficult to discriminate between a genuine product and an illegal duplicated product when the disc is copied by using CD-R or CD-RW. . Further, due to the improvement in printing technology, it is easy to duplicate the label surface, and it is difficult to distinguish between a legitimate product and a legally duplicated product.

Conventionally, regarding security, the authentication data has been embedded as a part of the recording data. If the authentication data was embedded as part of the recorded data, the signal could be read. Further, since the disk duplication technology has been developed, it is difficult to differentiate the original and the duplicate in the internal data.

Therefore, the present invention has been proposed in view of such a conventional situation, and an image, a character, and a symbol are optically visualized on an information recording surface, and the meaning is waited for as an outer package. The information recording surface has a commercial value, and it is possible to distinguish between data recording media of the same kind in which the same copyrighted material data is recorded, and securely protect the master recording the copyrighted material data, which is difficult to copy. It is an object of the present invention to provide an optical recording medium capable of adding a function as enhanced security.

[0010]

The optical recording medium of the present invention comprises:
An optical recording medium in which tracks and recording pits are spirally or concentrically formed on a disk substrate, wherein the track width and / or track pitch of the track, or the pit width and / or pit length of the recording pit. The optical interference is generated by changing the height, and the information visualized by the optical interference is displayed on the information recording surface.

In the above-described optical recording medium according to the present invention, information visualized by optical interference generated by changing the width and / or the length of the track or the recording pit is displayed. Visualization information such as an image can be displayed on the information recording surface without affecting the reading.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. It should be noted that in the following description, a disc-shaped optical disc as shown in FIG. 1 will be described as an example of the optical recording medium, but the shape of the optical recording medium of the present invention is not limited to this.
A multi-layered optical disc having a plurality of recording layers and an optical disc having recording surfaces on both sides are also within the scope of the present invention.

As shown in FIG. 1, among the optical discs 1,
The area in which the copyrighted material data is described is called the recording surface 1a, and the printing surface, which is the back side of the recording surface, is called the label surface 1b.
Then, in the optical disc of the present invention, as shown in FIG.
An optically visualized image 2 is recorded on the recording surface.

Next, the basic structure of the optical disc will be described. As shown in FIG. 2, this optical disk includes a polycarbonate substrate 3 which is a transmission medium of control light, and an aluminum layer 4 for reflecting light from an optical pickup when taking a signal.
And a protective layer 5 for protecting them. The information recording portion formed integrally with the polycarbonate substrate 3 is called a pit 6, and the other portions are called lands 7. The track width T is between the pits.

When manufacturing an optical disc containing data, first, a recording signal is converted into a digital signal represented by [0] [1], and the signal represented by [0] [1] is represented by unevenness. A recording layer having pits is formed by producing a mold and pressing a polycarbonate substrate using this mold. In the pit 6, information such as music, text, images, etc. is written. Further, since the optical disc 1 is basically structured to irradiate light and read out information while rotating, the pits 6 are arranged in a spiral or concentric pattern.

The optical disc 1 is manufactured by forming the aluminum layer 4 which is a reflection layer and the protective layer 5 on the polycarbonate substrate 3 in which the pits 6 are formed.

When reading a signal with an optical pickup,
The track has a function of stably performing read control by providing a certain interval in the disc radial direction of the pits 6 arranged in a spiral shape. However, the improvement of the control function of the optical pickup is remarkable now,
Stabilization of optical discs has become possible.

Therefore, in the present invention, by changing the track width, the image is optically visualized by the width of the track. As an image, like holography,
By changing the angle, optical interference is caused, and an image visualized by the optical interference is considered.

More specifically, FIG. 3 shows the conventional positional relationship between pits and lands in an enlarged manner.
And n + 1, and the track widths between n + 1 and n + 2 were T evenly. Currently, the tracking ability to control the position of the optical pickup is improved so that the laser beam hits the pit of the optical disk correctly, and if it is within a certain track width error, the optical pickup hits the laser beam correctly on the pit. The position of can be controlled.

In the present invention, as shown in FIG.
The track widths between n and n + 1 and between n + 1 and n + 2 are T ₁ and T ₂ , respectively. As described above, since the tracking ability is improved, it is not necessary that the track widths are uniform within the error range. That is, the present invention changes a parameter such as a track width within a range that is allowed as a tracking error and visualizes an image by optical interference.

In the present invention, not only is the track width changed, but the pit width and pit arrangement are changed. An image may be optically visualized depending on the width and the arrangement change. The pit width and the pit interval do not have to be uniform as long as they are within an allowable error range. For example, when changing the pit width, the pit widths are set to P1 and P2 for n and n + 1, respectively, as shown in FIG.

Next, a specific method for forming a visualized image by changing parameters such as track width and pit width will be described.

First, as schematically shown in FIG. 6, data to be visualized is first subjected to a visualization simulation based on parameters such as track width and pit width. At this time, parameters such as the track width and the pit width are changed within the range where tracking is possible. After that, original signal data such as music, text and video to be recorded is added and simulated, and integrated with a visualized image to finally obtain signal writing data.

A block diagram of the above process is shown in FIG. First, a digitized recording original signal 10 such as music, text or video to be recorded and a display image signal 11 to be optically visualized are sent to a simulation section 12 to generate a control signal so that optical conversion can be performed. . And track width,
A write control signal for controlling the pit width and the original recording signal are sent to the signal description system control unit 13 such as a cutting machine, and finally the signal writing unit 14 writes the signal to the mold or the optical disk to display an image. Let

In this way, by changing the parameters such as the track width within the range that is allowed as an error, a visible image is displayed on the information recording surface 1a of the optical disc 1 to identify the information recording surface 1a. The information can be displayed directly, and the commercial value can be given to the optical disc 1.

Further, although information recorded in the optical disc 1 can be copied and duplicated, it is difficult to duplicate even these visible images. It becomes easy to determine. As a result, security protection is further enhanced.

Further, regarding security, the image itself which can be optically visualized on the information recording surface can be used as a factor for judging the genuine product.

Recording / recording on an optical disc as described above
FIG. 8 shows an outline of a recording / reproducing apparatus which is preferably used when reproducing. When the optical disc is copied or reproduced, the image written on the information recording surface of the optical disc is compared with the authentication data embedded in the signal to be recorded or added to the outside so that the disc can be authenticated. Determine whether the product is good or not, and prevent copying to general optical disks. Alternatively, if the product is not a genuine product, processing such as reproduction impossible or reduction of reproduction quality can be performed. This is realized by referring to a record ID and an ID-converted image of an optically visible image drawn on the recording surface of the optical disc. In addition, it utilizes the feature that an image that can be optically visualized can be created only by the master manufacturing side.

As shown in FIG. 8, this recording / reproducing apparatus 20
Is a spindle motor 2 for rotating the optical disc 1.
1 and an optical head 22 that scans a region of the optical disc 1 in which data is recorded and reads the data recorded in the optical disc 1.

The data read by the optical head 20 is R
It is supplied to the F processing unit 23. The reproduced RF signal output from the RF processing unit 23 is sent to the EFM demodulation circuit 24,
After the EFM demodulation, it is sent to the lead-in read circuit 25.

Further, various signals for servo such as a tracking error signal and a focus error signal output from the RF processing unit 23 and a reproduced clock signal from the EFM demodulation circuit 24 are supplied to the servo circuit 26, and the servo circuit 26 is supplied. 26
Outputs various servo signals. Of the servo signals output from the servo circuit 26, the spindle servo signal is supplied to the spindle motor 21 for disk rotation drive. The tracking servo signal and the focus servo signal are coupled to the biaxial actuator of the optical head 22, and the sled servo signal is supplied to the sled drive motor of the sled mechanism 27 that moves the optical head in the disk radial direction. Control commands, control data, etc. are transmitted and received between the servo circuit 26 and the CPU 28.

The image pickup section 30 includes a lens section 31 for taking in an image of a subject, a CCD 32 for generating an image signal, a sampling / bold (S / H) circuit 33, and an A / D conversion circuit for converting the image signal into a digital signal. 34 and. The CCD 32 generates an image signal from the subject image from the lens section and supplies the generated image signal to the S / H circuit 33. The S / H circuit 33 samples and holds the image signal from the CCD and then supplies it to the A / D conversion circuit 34. The A / D conversion circuit 34 A / D converts the digital signal from the S / H circuit 33, and the image signal processing unit 35.
Supply to. The image signal processing unit 35 is controlled by the CPU 28 and has a form necessary for the image-ID conversion 13, such as color reference form conversion from an RGB signal to a color difference / luminance signal, for a digital image signal from the imaging unit 30. Image processing. Then, the processed image signal is supplied to the image presence / absence determination processing unit 36.

Next, the recording / reproducing apparatus 2 having such a configuration.
The reproduction operation of 0 will be specifically described with reference to FIG.

First, as an example, CD-DA (CD-Dlgltal
As shown in FIG. 9, if the information written inside is grouped into a session, the Audio) reads LeadIn (lead-in) -Dat from the inside to the outside of the disc.
Information is written in the order of a (data) -Leadout (leadout). In the lead-in, track information of the data part is written, and TOC (Table of Content
s). The optical disc 1 is mounted on the apparatus, the lead-in area of the optical disc 1 is accessed by the optical head 22, and the information recorded in the lead-in area is read. On the other hand, when the optical disc 1 is loaded, the image that is optically projected on the recording surface of the optical disc is read by the imaging unit 30. However, in the image that is optically projected,
There is always the direction of the top and bottom, and when performing image processing, it may be more appropriate to determine the top and bottom. Further, the image read by the CCD 32 may be geometrically transformed.

First, the presence / absence determining circuit 36 determines the presence / absence of a target recording surface image. If the image is not determined, the reproduction mode of data corresponding to copyrighted material data is stopped or prohibited 38. Alternatively, the recorded literary work data is converted by the image quality / sound quality conversion unit 39 and output 40. When the information recorded in the lead-in area is read from the optical head 22, the recorded identification ID and the identification ID converted by the image-ID conversion unit 37 are transferred to the individual ID identification circuit 41. Collation of internal data and external data is performed. Here, if the respective identifications are OK, they are reproduced 42 by the reproducing device as they are. If the identification is NG, the reproduction mode of the data corresponding to the copyrighted material is stopped or prohibited 43, or the copyrighted material data recorded by the image quality / sound quality conversion unit 39 has noise, image quality or sound quality. It is reproduced 40 in the state.

Here, a method of determining an ID described in data will be described. The image of the optical disc 1 including the optically visible image produced by the stamper is picked up by the CCD in the image pickup unit 30 and is picked up as a special image through the image signal processing unit 35. If the presence / absence determination circuit 36 determines the presence / absence of the target recording surface image as a result of capturing as a special image, the image-ID conversion unit 37 outputs the ID.
The ID is converted and the ID is determined. As the method of this ID conversion, the more difficult the processing is, for example, the surface area of the image, the more difficult the decoding becomes. Also, various combinations such as the combination with the author finger ID are possible.

As an example of a method of reading a unique code (ID) from an image, ADRC (Adaptive Dynamic Range C
oding) means may be used.

Originally, ADRC is a VTR (Video Tape R).
It is an adaptive requantization method developed for high-performance coding for e-coders), but it can efficiently express local patterns of signal levels with short word lengths, so it is used as conversion data from images to unique codes. be able to.

If the pixel used for the ID corresponding to the level distribution pattern of the image data is an ID tap, the ADRC
When using, the maximum value of ID tap data is MA
X and the minimum value thereof are MIN, the dynamic range (DR) of the data of the ID tap is shown in the equation (1). DR = MAX-MIN + 1 (1) When the number of requantization pits is P, the requantization code q _i as compressed data is ID by the operation of (2) for each pixel data k _i as ID data. Obtained as information. However, in the equation (2), [] means a truncation process. When the ID tap data is divided into blocks and there are N _a pixel data, i = 1 to N
_a .

Q _i = [(k _i −MIN + 0.5) × 2 ^P / DR] (2) When P = 1, that is, 1 bit, the data of the ID tap in the block is represented by 0 and 1. By passing the data of 0 and 1 as a data string, the data can be applied to the allocated data portion of the lead-in portion of the disc. When the IDs are complicated, if the blocks are rearranged based on the individual IDs, a complicated unique ID is created.

When the individual ID is not identified by the individual ID identification circuit 41, the recorded work data is converted by the image quality / sound quality conversion section 39 and output 40.
The method of data conversion will be described below.

As an example, FIG. 10A shows a sound plan CD (CD-Dl
gltal Audio) block. The copyrighted-material data of a CD is physically listed by 0 and 1, and the data is divided into blocks and recorded, and one block corresponds to 2352 bytes. As a method of enumerating, Lch (Left channe
l) LSB (Least Signficant Byte), Lch (Leftch
annel) MSB (Most Significant Byte), Rch (Ri
ght channel) LSB and Rch (MSB) are repeatedly and continuously performed. Lch or Rc shown in FIG.
h has a 16-bit structure and is one word. Each word is
It consists of high-order 8 bits and low-order 8 bits, and converts 8 pits of data into 17 channel bits (14 conversion parts + 3 bit connection parts) by EFM.

As a method of data conversion as a coping method when the identification IDs do not match, for example, as shown in FIG. 10B, only the LSB of the entire data array is converted into 8-bit data into a decimal number 0. It does the thing and produces the effect of lowering the sound quality.

In addition, a CD-ROM (Compact Disc Read
Similarly, with respect to other optical recording media such as Only) and DVD, by omitting the upper and lower bits, it is possible to obtain the effects of data loss and image quality deterioration during duplication or reproduction.

The description has been given above by taking the case of reproducing information from the optical disc as an example, but the same applies to the case of recording information on the optical disc.

[0046]

By changing the track width and track pitch of tracks formed on the optical disk, or the width and length of recording pits, an image visualized by optical interference can be displayed on the information recording surface. It will be possible. The image displayed on the information recording surface makes it possible to add commercial value to the optical recording medium.

On the same optical disc on which the copyrighted material data is recorded, the displayed image and the recording data are referred to each other to be used as the judgment of the original disc or the owner and embedded in the signal to be recorded. Moreover, by collating with the added authentication data, it is possible to prevent copying to a general optical disc and to perform processing such as lowering reproduction quality. This allows
CD-R, CD-RW and other duplication by burning are not possible. Further, since the image is optically visualized on the recording surface, it is difficult to copy the image by the copying machine. Further, even if it is copied by an illegal act, it can be easily distinguished visually from the master.

As a result, according to the present invention, it is possible to reliably prevent illegal copying of copyrighted material data and protect the interests of the copyright holder.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing the concept of an optical disc of the present invention.

FIG. 2 is a cross-sectional perspective view schematically showing the structure of the optical disc of the present invention.

FIG. 3 is a plan view schematically showing an enlarged positional relationship between pits and lands of a conventional optical disc.

FIG. 4 is an enlarged schematic plan view showing an example of the positional relationship between pits and lands of the optical disc of the present invention.

FIG. 5 is an enlarged schematic plan view showing another example of the positional relationship between pits and lands of the optical disc of the present invention.

FIG. 6 is a diagram schematically showing the concept of writing data conversion of an image to be visualized in the present invention.

FIG. 7 is a block diagram schematically showing a process of converting write data of an image to be visualized in the present invention.

FIG. 8 is a block diagram schematically showing a configuration example of a recording / reproducing device for recording / reproducing information on / from the optical disc of the present invention.

FIG. 9 is a diagram schematically showing a data area of the optical disc of the present invention.

FIG. 10 is a diagram schematically showing how data is converted according to the ID determination result written on the optical disc of the present invention.

[Explanation of symbols]

1 optical disk, 2 visualized image, 3 polycarbonate substrate, 4 aluminum layer, 5 protective layer, 6 pits, 7 land

Continued front page    (72) Inventor Hideo Nakaya             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Takashi Takashi             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Naoki Takeda             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F-term (reference) 5D029 WA20 WB11 WD30

Claims (3)

[Claims] 1. An optical recording medium in which tracks and recording pits are spirally or concentrically formed on a disk substrate, the track width and / or track pitch of the tracks being
Alternatively, the optical recording is characterized in that optical interference is generated by changing the pit width and / or the pit length of the recording pit, and the information visualized by the optical interference is displayed on the information recording surface. Medium. 2. The track width and / or the track pitch, or the pit width and / or the pit length are changed within the error range of the tracking servo. The optical recording medium described. 3. The optical recording medium according to claim 1, wherein the visualized information is information used when performing signal processing on a signal recorded in the recording pit.