JPH11213455A - Optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable discrimination whether a disk is one to be reproduced by widening the width of the pits having a specific length among ordinary pits, for those pits depicting information related to the recording information recognizable to the naked eye. SOLUTION: Information relating to recording information is depicted by widening the width of the pits more than usual from 3T to 6T among those pits from 3T to 11T formed on an optical disk. As a result, compared to the case where the pits are formed all with the same width, the strength of the reflected light is weakened on the signal recording surface, so that the information relating to the recording information floats and becomes recognizable to the naked eye. Since only the pit width from 3T to 6T is widened more than usual, the pit length from 3T to 6T is unchanged, having no effect at all on the reproducing characteristics. Consequently, the control of the optical disk becomes convenient as well as recognition whether or not the optical disk is the one to be reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a read-only optical disk in which information is recorded in pits.

[0002]

2. Description of the Related Art An optical disk (such as a CD) in which concave pits are arranged on the recording surface of an optical disk and the dimensions of the concave pits are modulated in accordance with recorded information to reproduce digital audio signals and video signals. Are widely spread. In recent years, double-density C, which has a higher recording density than a CD used in a karaoke system or a game machine, has been used.
D is being developed.

In the read-only optical disk as described above, a mark is physically provided in an area other than an information recording area, or a pit having a specific length as disclosed in Japanese Patent Laid-Open No. 5-6576. The recording content or the serial number is identified by forming a pit with a width wider than usual.

[0004]

However, Japanese Patent Laid-Open Publication No.
In the optical disc formed by the method disclosed in U.S. Pat. No. 576, the pits in which the information related to the recorded content is widened are formed in areas other than the signal recording area, and thus the recording density of the optical disc is reduced. There was a problem.

Therefore, the present invention solves such a problem,
It is an object of the present invention to provide a read-only optical disk that draws information related to recorded information that can be visually recognized from the signal reading surface side without reducing the recording density of the optical disk.

[0006]

Means for Solving the Problems and Effects of the Invention The invention according to claim 1 is an optical disk in which information related to recorded information recognizable by the naked eye is drawn by pits. According to the first aspect of the present invention, the information related to the recorded information can be recognized by the naked eye, and therefore, in the case of an optical disk on which music information is recorded, whether or not the desired music is quickly recorded on the optical disk is determined. Can be recognized.

According to a second aspect of the present invention, there is provided an optical disk having a pit for recording a signal and depicting information related to recorded information. According to the second aspect of the present invention, since the information related to the recording information is drawn by the pits, it is easy to manufacture the optical disk. Claim 3
According to the invention according to the second aspect, in the optical disk according to the second aspect, the pits in which the information related to the recording information is drawn do not affect the reproduction characteristics of the signal.

According to the third aspect of the present invention, the pits for drawing the information related to the recording information do not affect the reproduction characteristics of the signal. You can draw information to do. According to a fourth aspect of the present invention, in the optical disk according to the third aspect, the pits for drawing information related to the recording information are pits having a wider pit having a specific length among normal pits. Is an optical disk.

According to the fourth aspect of the present invention, information related to recording information can be drawn on an optical disk only by increasing the width of a pit having a specific length among pits for recording a signal. it can. According to a fifth aspect of the present invention, in the optical disk according to any one of the first to fourth aspects, the information related to the recording information is a title, an artist, a logo mark, or a C mark.
This is an optical disk that is a D title or a management number.

According to the invention described in claim 5, a title, an artist, a logo mark, a CD title, or a management number is recorded as information related to the recording information. Management, operation, etc. become easier than before.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a pit row for recording a signal on an optical disk. As shown in FIG. 1, when recording a signal by EFM modulation, a pit for recording a signal has pits of 3T to 11T, and a larger number of pits having a shorter pit length exist as compared with pits having a longer pit length. Therefore, in the present invention, the 3
Of the pits from T to 11T, the width of the pits from 3T to 6T is made wider than usual to draw information related to the recorded information. The pit width L1 is the same for all pits from 3T to 11T. In the case of a CD, the value is about 0.5 μm.
m. In the present invention, the width of the pit is set to about 0.
7 μm.

FIG. 2 shows an arrangement of pits in the case where the width of pits from 3T to 6T among pits formed on the optical disk is widened. By forming pits with a fixed length of pits wider than usual, the intensity of the reflected light on the signal recording surface becomes weaker than when pits are formed with the same width, and the recorded information And the information related to と emerges and can be recognized by the naked eye.

That is, as shown in FIG. 3, when the optical disk 1 having the spirally formed tracks 2 is viewed from the signal reading surface side, the character "A" 3 which is information related to the recorded information is visually recognized. Can be recognized. Referring to FIG. 4, in the present invention, the width of the pits from 3T to 6T does not change because the width of the pits from 3T to 6T is made wider than usual to draw information related to recording information on the optical disc. . Therefore, even if the pits 42, 43, 44, and 45 whose widths are increased are irradiated with the laser light 40, the pits 42, 43, 44, and 4 in the traveling direction of the laser light 40, that is, the direction indicated by the arrow 41.
Since the length of 5 is the same as that of a normal 3T to 6T pit, it does not affect the signal reproduction characteristics at all. Also,
The pits of 3T to 6T have a function as a pit for recording a signal and also have a function as a pit for drawing information related to recording information.

In the present invention, as the information related to the recording information, when music information is recorded on the optical disc 1, the "title" and "artist" of a song are drawn, and when other information is recorded. Is the CD title, management number,
Draw a logo mark, etc. By drawing these pieces of information, the user can easily identify whether or not the optical disk is to be reproduced, and is also convenient for managing the optical disk.

With reference to FIGS. 5, 6, and 7, a method of manufacturing the optical disc 1 in which characters indicating information related to recording information will be described. FIG. 7 shows an apparatus for cutting a master disc for producing the optical disc 1. The spindle motor 61 rotates the disk master 50 at a predetermined number of revolutions based on an instruction from the motor driver 62 and outputs a reference pulse signal (A) to the pulse generation circuit 58. Character data 59 indicating information related to the recording information is input to a pulse generation circuit 58 together with a clock 60 and a reference pulse signal (A) from a spindle motor 61. A predetermined pulse signal (a1) based on the reference pulse signal (A) in a method described later,.
・, (An) is generated. The generated pulse signal (a
, (An) are input to the memory 56. On the other hand, the recording data is modulated into a predetermined format by the encoder 57 and input to the memory 56. The memory 56 stores 3T to 6T in a method described later based on the pulse signals (a1),.
A pulse signal for recording is generated to increase the width of the pits and to make the width of the pits from 7T to 11T the same as usual, and the generated pulse signal is output to the driver 55. The driver 55 converts the input recording pulse signal into a voltage for driving the modulator 53, and outputs the converted signal. Modulator 5
3 modulates the laser light emitted from the laser 54 based on the voltage value sent from the driver 55 so as to be turned on / off at a predetermined power for an irradiation time. The laser light modulated by the modulator 53 is applied to the master disc 50 via the reflection mirror 52 and the condenser lens 51, and character data indicating information related to the recording information is recorded together with the recording data. Further, the control device 63 controls each part of the cutting device.

Referring to FIG. 6, generation of a pulse signal for drawing character "A" 3 on optical disk 1 will be described. A pulse signal (a1) for drawing the character “A” 3 for each track in the radial direction 60 of the optical disc 1.
*, (An) are generated. Also, from the spindle motor 60, an optical disk 1 for drawing a character "A" 3
A reference pulse signal (A) for determining the upper position is generated and input to the pulse generation circuit 58. Referring to FIG.
The pulse generation circuit 58 adjusts the phases of the pulse signals (a1),..., (An) for drawing the character “A” with reference to the rising edge 70 of the input reference pulse signal (A). Output to 56. The memory 56 stores “Hig” of the input pulse signals (a1),.
In the recording data input from the encoder 57 during the period "h", the width of the pits of 3T to 6T is increased, and the width of the pits of 7T to 11T is not changed at all. Further, the width of the pit of 3T to 11T input from the encoder 57 during the period in which the reference pulse signal (A) is “Low” is not changed at all.

The width of the pit from 3T to 6T is increased by setting the power of the laser beam higher than usual and shortening the irradiation time. For example, when a 3T pit is formed on the optical disc 1, the power of the laser beam is 1 m.
W and the irradiation time are 680 s, but when forming on the wide 3T pit optical disc 1, the power of the laser beam is set to 1.05 mW and the irradiation time is set to 650 s.
Accordingly, the memory 56 generates a pulse signal so that the power of the laser beam and the irradiation time are set. That is, as shown in FIG. 8, for a pulse signal 80 for forming a normal 3T pit, a pulse signal 81 for increasing the power of the laser beam and shortening the irradiation time is generated.

As described above, information related to recording information can be drawn on the optical disk 1. In the above description, the pits for widening the pits are pits of 3T to 6T. However, the pits are not limited to this, and as long as the information related to the recorded information can be recognized with the naked eye.
Pits of any range of length may be used.

The width to be widened is 0.5 μm, which is the original width.
However, the width is not limited to 0.7 μm, and may be any width as long as the width of the pit and the radial width of the disk on which no pit is formed are within 1: 1. Further, drawing information related to the above-described recording information on an optical disk is not limited to a CD, but may be a double-density CD or DVD which is a read-only optical disk or a magneto-optical disk which is a recordable / reproducible optical disk. It is also applicable to media, phase change disks, and the like. In addition, when applied to such an optical disc, pits depicting information related to recording information do not affect the recording and / or reproduction of signals.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an arrangement of pits on an optical disc.

FIG. 2 is a schematic diagram showing an arrangement of pits when the width of pits from 3T to 6T is increased.

FIG. 3 is a plan view when a letter “A” indicating information related to recording information recognizable by the naked eye is drawn on an optical disc.

FIG. 4 is a diagram for explaining that pits of 3T to 6T whose width is widened do not affect signal reproduction characteristics.

FIG. 5 is a block diagram of a cutting device for a master optical disc.

FIG. 6 is a diagram illustrating generation of a pulse signal for drawing a character “A” indicating information related to recording information.

FIG. 7 shows a reference pulse signal necessary for drawing a character “A” indicating information related to recording information on an optical disc and a pulse signal for drawing a character “A” indicating information related to recording information. It is a figure explaining a relation.

FIG. 8 is a diagram showing a pulse signal for setting a power and an irradiation time of laser light for forming a normal pit and a pit having a wider width.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 2 ... Track 3 ... Information related to recording information 40 ... Laser beam 42, 43, 44, 45 ... Pit 50 ... Disc master 51 ... Condensing lens 52 ... Reflection mirror 53 ... Modulator 54 ... Laser 55 ... Driver 56 ... Memory 57 ... Encoder 58 ... Pulse generation circuit 59 ... Character data 60 ... Clock 61 ... spindle motor 62 ... motor driver 63 ... control device

Claims (5)

[Claims] An optical disk in which information related to recorded information recognizable by the naked eye is drawn by pits. 2. An optical disk having pits for recording signals and for drawing information related to the recorded information. 3. The optical disk according to claim 2, wherein said pits are pits which do not affect the reproduction characteristics of a signal. 4. The optical disc according to claim 3, wherein the pits are pits having a specific length and a wider width than the normal pits. 5. The information related to the record information includes a title,
The optical disc according to any one of claims 1 to 4, wherein the optical disc is an artist, a logo mark, a CD title, or a management number.