JP2002197655A - Disk-like recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a disk-like memory medium which is capable of visually recognizably displaying characters, symbols (including bar codes) or graphics (including images) by many steps of gradients. SOLUTION: The visually recognizable characters CH, symbols or graphics are displayed in the disk-like recording medium DS by the set, across plural recording tracks, of the pixels consisting of the groups by each of prescribed angles of plural optical recording traces of random patterns set with the widths of the respective optical recording traces at an arbitrary width among >=3 steps all inclusive of 0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data such as characters (CD) (compact discs), DVDs (digital versatile discs), etc.
The present invention relates to a disk-shaped recording medium on which symbols (including barcodes) or graphics (including images) are displayed so as to be visible.

[0002]

2. Description of the Related Art Referring to FIG. 4, in addition to data of information such as music and video, characters, symbols (including barcodes), or figures (including images) are displayed on a disc. A conventional cutting machine for recording so as to be visually recognized on a recording medium will be described. This cutting machine includes a cutting machine body 1 for recording data of information such as music and video (hereinafter, referred to as information data) on a photoresist layer (photochemical reaction layer) on a disk-shaped glass master, and the cutting machine. It comprises a code generator 2 which can be added to the machine body 1 to form characters, symbols (including barcodes) or graphics (including images) on a photoresist layer on a glass master.

First, the cutting machine body 1 will be described. Reference numeral 5 denotes a glass master, on which a thin photoresist (photochemical reactant) is applied, although not shown. A spindle motor 3 rotates a spindle (not shown) on which the glass master 5 is loaded. 4 is
A spindle servo circuit that drives the spindle motor 3. A spindle pulse obtained in accordance with the rotation of the spindle motor 3 is supplied to the servo circuit 4. The servo circuit 4 is formed on a photoresist layer (not shown) so that a spiral track close to a circle with a constant linear velocity is formed.
Operates the spindle motor 3.

[0006] Reference numeral 6 denotes a recording laser light generator (for example, He
-Cd laser generator), the laser light thereafter is supplied to an optical modulator 7, modulated by a signal from a signal selection circuit 10, then enters a reflecting mirror 8, and its optical path is
For example, after being deflected by 90 °, the light is incident on the objective lens 9 and focused, and the focused laser light is applied to the photoresist layer on the glass master 5. Although not shown, the optical head including the reflecting mirror and the objective lens can be moved from the center to the outer periphery on the radius of the glass master by a head driving device (not shown). This optical head has focusing servo means.

[0005] Reference numeral 11 denotes a master tape reproducer for reproducing PCM audio signals recorded on a magnetic tape. The PCM audio signal from the master tape player 11 is 8-14
The EF is supplied to the modulation circuit 12 and subjected to 8-14 modulation.
The M (8-14 modulation) signal is supplied to a signal selection circuit 10 for selecting a signal from the modulation signal from the code generator 2.

Next, the code generator 2 will be described. Reference numeral 13 denotes a pseudo EFM signal generation circuit, which is a pulse code signal of various (random) code patterns generated based on random numbers at predetermined angles of the glass master.
For example, it generates EFM signals of various code patterns generated based on random numbers, that is, pseudo EFM signals. 1
Reference numeral 4 denotes an image data storage device which stores a 1-bit binary signal corresponding to a character, a symbol (including a bar code) or a graphic (including an image) to be recorded, and a spindle pulse from the spindle motor 3. Is the clock pulse,
The binary signal is read by the read address signal formed based on the clock pulse, and the binary signal is supplied to the ON / OFF modulation circuit 15 and the binary signal is read.
In response to the value signal “1” or “0”, the pseudo EFM signal
N / OFF. O from the ON / OFF modulation circuit 15
The N / OFF pseudo EFM signal is output to the signal selection circuit 10.
Is supplied to the optical modulator 7 and is selected between the EFM signal from the modulation circuit 12 and the selected signal.

Next, referring to FIG. 5, recording of a signal on a photoresist layer on the glass master 5 by a focused laser beam from the objective lens 9, that is, formation of pits (optical recording traces) will be described. . FIG. 5A shows a waveform of the EFM signal from the modulation circuit 12. FIG. 5B shows the shape of the pits recorded on the photoresist layer on the glass master 5 when the EFM signal is supplied to the optical modulator 7 through the signal selection circuit 10. The pit shape in FIG. 5B is a pit having a length corresponding to the time width of the “1” pulse of the EFM signal and having a constant width.

FIG. 5C shows a waveform of the pseudo EFM signal from the pseudo EFM signal generating circuit 13 at each predetermined angle of the glass master 5. In the case of recording by a focused laser beam on the photoresist layer on the glass master 5, A spindle pulses are obtained from the spindle motor 3 per one rotation of the glass substrate 5, that is, a predetermined angle of the glass master 5. Ie, 3
One spindle pulse is obtained every 60 ° / A. The time in the section of the pseudo EFM signal in FIG. 5C is 1 / A of the time required for one rotation of the glass master 5.

FIG. 5D shows an image data signal (a 1-bit binary signal) read from the image data storage device 14, which is "0" or "1".
Every 1 / A of the time required for rotation, that is, the predetermined angle 3
Occurs every 60 ° / A.

FIG. 5E shows an output signal of the ON / OFF modulation circuit 15. When the image data signal read from the image data storage device 14 is "0", no output signal is obtained and the image data signal is not obtained. Is “1”, the glass master 5
The pseudo EFM signal at every predetermined angle of 360 ° / A is output as it is. FIG. 5F shows a case where the output signal of the ON / OFF modulation circuit 15 is supplied to the optical modulator 7 through the signal selection circuit 10 and the predetermined signal of the glass master 5 recorded on the photoresist layer on the glass master 5. The shape of a pit (optical recording trace) at every 360 ° / A is shown. The shape of the pit in FIG. 5F is a pit having a length corresponding to the time width of the “1” pulse of the pseudo EFM signal when the image data signal is “1” and having a constant width.

The data of characters, symbols (including bar codes) or graphics (including images) recorded on the photoresist layer on the glass master 5 is recorded on the same surface as the surface on which information data is recorded. In this case, the information data is recorded in an area other than the recording area of the information data (the outer peripheral side, the inner peripheral side, or the intermediate area).
When data of characters, symbols (including barcodes) or graphics (including images) is recorded on a surface on which information data is not recorded, there is no limitation on the recording area. In the latter case,
In the case of a manufactured disc-shaped recording medium, as this disc-shaped recording medium, in addition to the recording layer on the surface, another recording layer (lower recording layer) is provided below the recording layer, and the recording layer on the surface is provided. In addition, characters, symbols (including barcodes) or graphics (including images) are formed so that they can be visually recognized,
Information data pits (optical recording traces) on the lower recording layer
Is formed.

[0012]

In the conventional cutting machine described with reference to FIG. 4, in the image data storage device 14, a spindle pulse obtained from the spindle motor 3 is read as a clock to form a read address signal. However, since the stored image data signal (binary signal) is read out based on the read address signal, the image data signal (binary signal) is read out on the photoresist layer on the glass master 5 due to the low frequency of the spindle pulse. , High-resolution characters, symbols (including barcodes) or graphics (including images) could not be recorded. This is especially true when a curve is to be recorded in a direction that is not along the direction of the spiral recording track or the radial direction on the photoresist layer on the glass master 5 and the roughness of the pixels (dots) that constitute the curve. However, there is a drawback that it becomes conspicuous.

In view of the above, the present invention proposes a disk-shaped recording medium capable of visually displaying characters, symbols (including barcodes), or graphics (including images) with multiple gradations. It is assumed that.

[0014]

According to a first aspect of the present invention, a plurality of optical patterns of a random pattern in which the width of each optical recording trace is set to an arbitrary width among three or more widths including 0 are set. A set of pixels consisting of a group of recording traces at predetermined angles, over a plurality of recording tracks, allows a character to be visually recognized,
This is a disk-shaped recording medium on which symbols or graphics are displayed.

According to the first aspect of the present invention, a plurality of random patterns in which the width of each optical recording trace is set to an arbitrary width among three or more widths including 0 are provided on the disk-shaped recording medium. The visible characters, symbols, or figures are displayed by a set of pixels formed by a group of optical recording traces at predetermined angles over a plurality of recording tracks.

According to a second aspect of the present invention, an optical recording trace of information data is recorded on a recording track in a predetermined area, and the width of each optical recording trace includes 0 in an area other than the predetermined area. Characters that are visually recognizable by a set of pixels formed from a group of a plurality of optical recording traces of a random pattern set to an arbitrary width of a step or more at predetermined angles over a plurality of recording tracks. , A symbol or a graphic.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of a cutting machine for producing a master for manufacturing a disk-shaped recording medium according to an embodiment of the present invention will be described below in detail with reference to FIG. In FIG. 1, portions corresponding to those in FIG. This cutting machine is a cutting machine body 1 for recording data of information such as music and video (hereinafter referred to as information data) on a photoresist layer (photochemical reaction layer) on a disk-shaped glass master.
And a character, a symbol (including a barcode) or a graphic (including an image) formed on a photoresist layer on the glass master by adding the character to the cutting machine body 1. Be composed.

First, the cutting machine body 1 will be described. Reference numeral 5 denotes a glass master, on which a thin photoresist (photochemical reactant) is applied, although not shown. A spindle motor 3 rotates a spindle (not shown) on which the glass master 5 is loaded. 4 is
A spindle servo circuit that drives the spindle motor 3. A spindle pulse obtained in accordance with the rotation of the spindle motor 3 is supplied to the servo circuit 4. The servo circuit 4 is formed on a photoresist layer (not shown) so that a spiral track close to a circle with a constant linear velocity is formed.
Operates the spindle motor 3.

Reference numeral 6 denotes a recording laser light generator (for example, He
-Cd laser generator), the laser light thereafter is supplied to an optical modulator 7, modulated by a signal from a signal selection circuit 10, then enters a reflecting mirror 8, and its optical path is
For example, after being deflected by 90 °, the light is incident on the objective lens 9 and focused, and the focused laser light is applied to the photoresist layer on the glass master 5. Although not shown, the optical head including the reflecting mirror and the objective lens can be moved from the inner circumference to the outer circumference on the radius of the glass master by a head drive device not shown. This optical head has focusing servo means.

Reference numeral 11 denotes a master tape reproducing device for reproducing PCM audio signals recorded on a magnetic tape. The PCM audio signal from the master tape player 11 is 8-14
The EF is supplied to the modulation circuit 12 and subjected to 8-14 modulation.
The M (8-14 modulation) signal is supplied to a signal selection circuit 10 that performs signal selection with a modulation signal from a digital attenuator 16 of the code generator 2.

Next, the code generator 2 will be described. Reference numeral 13 denotes a pseudo EFM signal generation circuit, which is an EFM of various types of code patterns generated based on random numbers, for example, as pulse code signals of various types of code patterns generated based on random numbers at predetermined angles of the glass master. A signal, that is, a pseudo EFM signal is generated. Reference numeral 14 denotes an image data storage device which stores a binary signal of a plurality of bits, for example, 4 bits, corresponding to a character, a symbol (including a barcode) or a graphic (including an image) to be recorded. The spindle pulse from the motor 3 is converted into n (where n is 2, 3, 4,...) By the frequency multiplier 17.
The pulse obtained by the multiplication is used as a clock pulse, and a read address signal formed based on the clock pulse is used as a clock pulse.
The 4-bit binary signal is read out, and the binary signal is supplied to a digital attenuator 16 as an amplitude modulator. The level of the pseudo EFM signal is 0, which is the value of 4-bit image data. Attenuated (amplitude modulated) according to any of the values 1, 2, 3,..., 14, 15. The attenuated (amplitude-modulated) pseudo EFM signal from the digital attenuator (amplitude modulator) 16 is sent to the signal selection circuit 1
0 and is selected between an EFM signal from the modulation circuit 12 and the selected signal is supplied to the optical modulator 7.

When the photoresist layer on the glass master 5 is irradiated with a focused laser beam to record a signal, the radius of the glass master 5 on the photoresist layer is 20 mm and 6 mm, respectively.
The frequency of the spindle pulse when recording with a focused laser beam at 0 mm is 10 A
(Hz) and (10/3) A (Hz). As described above, assuming that the multiplication ratio of the frequency multiplier 17 is n, the frequency multiplication when recording is performed by the focused laser beam at the radius of the glass master 5 on the photoresist layer of 20 mm and 60 mm, respectively. The frequency of the clock from the detector 17 is 10 nA (Hz) and (10 /
3) It becomes nA (Hz).

When the attenuated (amplitude-modulated) EFM signal from the digital attenuator (amplitude modulator) 16 is supplied to the optical modulator 10 through the signal selection circuit 10, when the value of the image data is 15, The energy of the laser beam applied to the photoresist layer on the glass master 5 corresponding to the "1" portion of the pseudo EFM signal is set to 100%, and "1" of the pseudo EFM signal when the value of the image data is 0. The energy of the laser beam corresponding to the "" portion is set to 0, and the glass corresponding to the "1" portion of the pseudo EFM signal when the image data values are 14, 13, 12,. The energy of the laser beam applied to the photoresist layer on the master 5 is represented by image data values 14, 13, 12,.
Energy corresponding to 1.

Next, referring to FIG. 2, recording of a signal on the photoresist layer on the glass master 5 by the focused laser beam from the objective lens 9, that is, formation of pits (optical recording traces) will be described. . FIG. 2A shows a waveform of the EFM signal from the modulation circuit 12. FIG. 2B shows the shape of pits (optical recording traces) recorded in the photoresist layer on the glass master 5 when the EFM signal is supplied to the optical modulator 7 through the signal selection circuit 10. This figure 2
The shape of the pit B is a pit having a length corresponding to the time width of the “1” pulse of the EFM signal and having a constant width.

FIG. 2C shows a waveform of the pseudo EFM signal from the pseudo EFM signal generating circuit 13 at each predetermined angle of the glass master 5. In the case of double-speed recording with a focused laser beam on a photoresist layer on the glass master 5,
Upon rotation, A spindle pulses are obtained from the spindle motor 3, that is, one spindle pulse is obtained at a predetermined angle of the glass master 5, ie, every 360 ° / A. When the multiplication ratio of the frequency multiplier 17 is n, nA pulses are obtained from the frequency multiplier 17 per rotation of the glass substrate 5. Therefore, the time of the section of the pseudo EFM signal in FIG. 2C is one of the time required for one rotation of the glass master 5.
/ NA.

FIG. 2D shows levels 0, 1, 2, 3,..., 14, 15 of the 4-bit image data signal read from the image data storage device 14 in decimal numbers.
It is generated every 1 / nA of the time required for one rotation of the glass master 5, that is, every predetermined angle 360 ° / nA.

FIG. 2E shows an output signal of the digital attenuator 16. The output signal of the digital attenuator 16 is such that the level of the pseudo EFM signal at a predetermined angle of 360 ° / A of the glass master 5 is 0, 1, 2, 3,...
.., 14 and 15 are set.

FIG. 2F shows a case where the output signal of the digital attenuator 16 is supplied to the optical modulator 7 through the signal selection circuit 10 and the predetermined angle 360 ° / degree is recorded on the photoresist layer on the glass master 5. The pit shape for each nA is shown.
The pit shape in FIG. 2F is such that the image data signal is “1”.
, The length corresponding to the time width of the “1” pulse of the pseudo EFM signal and the values 0, 1, 2, 3,
... Pits having a width corresponding to 14 and 15.
This pit allows characters and symbols (including barcodes)
Alternatively, a graphic (including an image) is formed on the photoresist layer on the glass master 5. In this case, characters, symbols (including barcodes) or graphics (including images) are, for example, as shown in FIG.
One pixel is formed by three, four, three, and three pits of F, respectively.

The data of characters, symbols (including bar codes) or graphics (including images) recorded on the photoresist layer on the glass master 5 is recorded on the same surface as the surface on which information data is recorded. In this case, the information data is recorded in an area other than the recording area of the information data (the outer peripheral side, the inner peripheral side or the intermediate area).
When data of characters, symbols (including barcodes) or graphics (including images) is recorded on a surface on which information data is not recorded, there is no limitation on the recording area. In the latter case,
In the case of a manufactured disc-shaped recording medium, as this disc-shaped recording medium, in addition to the recording layer on the surface, another recording layer (lower recording layer) is provided below the recording layer, and the recording layer on the surface is provided. In addition, characters, symbols (including barcodes) or graphics (including images) are formed so that they can be visually recognized,
Information data pits (optical recording traces) on the lower recording layer
Is formed.

With reference to FIG. 3, an example of an optical disk (disk-shaped recording medium) according to the embodiment of the present invention, which is manufactured from a master obtained by the cutting machine described with reference to FIGS. FIG. 3A shows an area other than the recording area of the information data on the recording surface of the finally obtained disk-shaped recording medium (an outer peripheral side, an inner peripheral side or an intermediate area is possible, but in this example, it is the outer peripheral side). ) Indicates the number of a pixel constituting a character, a symbol (including a barcode) or a figure (including an image) recorded in the character. In FIG. 3A, the recording area for characters, symbols (including barcodes) or graphics (including images) in the radial direction of the glass master is shown in an enlarged manner. The radial width is much smaller than the radial width of the information data recording area. This pixel is formed along a spiral track close to a circle. In this case, 100 per track
Each pixel and five tracks record a total of 500 pixels, which are schematically shown for ease of explanation. For example, in the case of a compact disc, the track on which the pixels are recorded is The number and the number of pixels per track are
The value is much larger than the example shown in FIG. FIG. 3B shows the numbers of the pixel data stored in the image data storage device 14 and corresponds one-to-one with the pixel numbers in FIG. 3A.

Referring to FIG. 3C, a disk (disk-shaped recording medium) as a product will be described. DS indicates a disc, and CH indicates a character displayed on the disc DS. FIG. 3C shows an example in which a label (not shown) is attached or printed on the front surface of the disk DS, information data is recorded on the back surface, and “S” is placed on the outer peripheral region other than the information data recording region on the back surface. Is recorded on the disk DS
3 shows that the correct letter S of the letter “S” can be visually recognized on the front side.

On the photoresist layer on the glass master 5,
The pixel data on the recording track recorded by the focused laser beam is one at every predetermined angle of 360 ° / nA.
Since the length of 1 / nA of each recording track is proportional to the radius of the recording track, the length of the pixel in FIG. 3A along the track increases from the inner track to the outer track.

Therefore, the arrangement pattern of the pixels on the recording track of the character, symbol or figure to be displayed is converted into an arrangement pattern of the pixels which is substantially inversely proportional to the radius of the recording track.
Image data composed of the pixel data of the converted array pattern is created and stored in the image data storage device 14. Of course, such image data is stored in the image data storage device 14.
Can also be made within.

In the finally obtained disk-shaped recording medium, the width of each optical recording mark (pit) is 0 including 0.
A plurality of pixels formed of a group of a plurality of optical recording traces of a random pattern at a predetermined angle of 360 ° / nA set at an arbitrary width among the widths of the steps or more (16 steps in this specific example) Of characters, symbols, or graphics having visible high resolution and multi-level (16 levels in this example) gradients are displayed.

As described above, the level of image data read from the image data storage device 14 is, for example, 16 levels, so that an image close to a photograph is recorded on the photoresist layer on the glass master 5. can do.
In addition, since a read address for reading image data from the image data storage device 14 is generated based on a clock obtained by multiplying the spindle pulse from the spindle motor 3 by n by the frequency multiplier 17, the read address is stored on the disk-shaped recording medium. Since the length of the pixels formed along the recording track in the track direction can be reduced, high-resolution characters, symbols (including barcodes), or graphics (including images) can be recorded on the disc-shaped recording medium.

[0036]

According to the first aspect of the present invention, a plurality of optical recordings of a random pattern in which the width of each optical recording trace is set to an arbitrary width among three or more widths including zero. A set of pixels consisting of a group of traces at predetermined angles is displayed over a plurality of recording tracks to display visible characters, symbols, or figures. It is possible to obtain a disk-shaped recording medium capable of visually displaying a symbol or a figure.

According to the second aspect of the present invention, an optical recording trace of information data is recorded on a recording track in a predetermined area, and the width of each optical recording trace is zero in an area other than the predetermined area. Is visually recognized by a set of pixels formed by a group of a plurality of optical recording traces of a random pattern set at an arbitrary width among three or more steps including a plurality of recording tracks over a plurality of recording tracks. Possible characters, symbols, or graphics are displayed, so that characters, symbols, or graphics can be visually recognized with multiple levels of gradation and high resolution in an area other than the predetermined area where the optical recording trace of information data is recorded Thus, a disk-shaped recording medium that can be displayed on a disc can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a specific example of a cutting machine capable of obtaining a master for producing a disk-shaped recording medium according to an embodiment of the present invention.

FIG. 2 is a diagram showing a signal pattern, a pit shape, and an image of image data in the cutting machine of FIG. 1;

FIG. 3 is a diagram illustrating a configuration of pixels and pixel data on a specific example of a disk-shaped recording medium according to an embodiment of the present invention, and a disk-shaped recording medium (disk) according to a specific example of the embodiment of the present invention; .

FIG. 4 is a block diagram showing a conventional cutting machine.

FIG. 5 is a diagram showing a conventional example of a signal pattern, a pit shape, and an image of image data in a conventional cutting machine.

[Explanation of symbols]

DS disk, CH character, 1 cutting machine body, 2 code generator, 3 spindle motor, 4 spindle motor servo circuit, 5 glass master disk, 6 laser light generator for recording, 7 optical modulator, 8 reflecting mirror, 9 objective lens, 10 signal selection circuit, 11 master tape player, 12 modulation circuit, 13 pseudo EF
M signal generation circuit, 14 image data storage device, 16 digital attenuator (amplitude modulator), 17 frequency multiplier, D
T disk (disk-shaped recording medium), CH character.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshihiro Nakamura 1300-1, Ohata, Yoshida-cho, Haibara-gun, Shizuoka Prefecture F-term in Sony Music Manufacturing Co., Ltd. F-term (reference)

Claims (2)

[Claims] 1. The width of each of the optical recording traces includes 0 including 3
Characters that are visually recognizable by a set of pixels formed from a group of a plurality of optical recording traces of a random pattern set to an arbitrary width of a step or more at predetermined angles over a plurality of recording tracks. , A symbol or a graphic is displayed. 2. An optical recording trace of information data is recorded on a recording track in a predetermined area, and a width of three or more steps including a width of each optical recording trace including 0 in an area other than the predetermined area. Of a plurality of optical recording traces of a random pattern set to an arbitrary width among a plurality of optical recording traces at a predetermined angle, and a set of pixels over a plurality of recording tracks, whereby a character, a symbol, or a figure that is visible. A disk-shaped recording medium characterized by being displayed.