JP3063662B2 - Optical disc and method of reproducing optical disc - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk capable of recording information on a spiral track by, for example, irradiating a laser beam, and a reproducing method therefor.

[0002]

2. Description of the Related Art An optical disk in which concave pits are spirally arranged on a recording surface of an optical disk and the dimensions of the concave pits are modulated on the basis of recorded information to reproduce digital audio signals and video signals. (C
D, VD) are widely used. However, pits are formed on such a read-only optical disk by a recording medium whose reflectance changes when irradiating a laser beam or by heat when irradiating the laser beam. A writable optical disk capable of recording and reproducing information by using a recording medium that can be formed is also in the stage of practical use.

In such a write-once optical disk, it is usually necessary to form a spiral pre-groove on the recording surface of the optical disk in advance in order to guide a laser beam for writing, and at the same time, it is necessary to simultaneously write the data. Power, the reflectivity of the recording surface, the linear velocity of the optical disk, the strategy of the write pulse, etc. are added to the innermost track of the optical disk in advance as information necessary for recording.

FIG. 2 shows an example of a preformat of such a writable optical disk. The disk shape (inner diameter r ₁ , outer diameter r ₂ ), track pitch, etc.
(Compact Disc). The recording surface is formed of a light-sensitive organic dye material or a film of an inorganic material.

Also, several tracks (radii of 23 to 2)
In the range of 5 mm), as shown in FIG. 3, there is provided a recording data area WFA in which the recording conditions as described above are recorded in pits P by embossing or the like in advance. When copying information of a conventional CD, TOC information (playing time, song number, etc.) of a signal to be recorded in the area next to the above-mentioned recording data area WFA is recorded as dot information, and subsequently, music information or the like is recorded. Will be recorded.

[0006]

However, in a writable optical disk having a recording surface made of an organic dye material or the like, the degree of modulation of the RF signal obtained by the pits P of the recording data area WFA formed in advance and the degree of modulation will be described later. Since there is a case where a considerable difference occurs in the modulation degree of the RF signal when the recorded information is reproduced, a problem arises when the reproduced optical disk is directly reproduced by the reproducing player. Further, when the reflectance of the recording surface of the optical disk changes in response to light, the polarity of the reproduced RF signal of the recording data area WFA and the reproduced RF signal of the recorded dot information may be different. However, there is a problem that a special reproduction system is required due to the difference.

[0007]

The optical disk of the present invention comprises:
In consideration of such a problem, a discrete pattern is designed to be as consistent as possible with a conventional CD.
Record in which at least the first data is recorded by the
Area, and a second data area provided on the inner peripheral side of the recording area.
That is modulated and wobbled in the radial direction
A peripheral recording area is provided .

[0008]

The groove in which the wobble period is modulated by the data of the optimum recording conditions (reflectance, laser power, linear velocity, modulation pulse waveform for setting the pit shape) required for the optical disk is provided. Because
At the time of recording, a wobbling group showing this recording data
While the recording condition is set by detecting the drive by a push-pull method or the like, the recorded contents of a CD or the like are copied, and at the time of reproduction, information written by a general-purpose CD reproduction player can be reproduced.

[0009]

FIG. 1 shows an embodiment of an optical disk according to the present invention. In particular, an area (hereinafter referred to as recording wobbling) in which data indicating recording conditions provided on the inner peripheral side is recorded. Region WWA). That is, from the innermost diameter r ₀ of the optical disk, for example, r = 23 mm
To become region, the linear velocity of the disc, the reflectivity, only wobbling grooves G _W being frequency-modulated by data indicating the recording condition to specify the laser power or the like is formed.

The recording wobbling area WW
In the area of radius r = 25 mm following A, the TOC information of the CD is recorded, and subsequently, the acoustic information of the CD and the like are recorded. Such an optical disk has the advantage that only an optical deflector need be prepared at the time of data mastering (at the time of producing a master), and an optical modulator is not required.

[0011] In the case of such a preformat writing type formed in the optical disk, because the condition data for writing is only the wobbling grooves G _W, a recording dot information of the conventional CD The same pattern can be used. In particular, wobbling grooves G _W modulated with data recording conditions, for example because it can easily be read by the detector of the push-pull method, a player for recording, as long as it performs the tracking by the push-pull method, The present invention can be applied to an optical disk using any recording material, and the recording system can be unified.

Detecting wobbling groove information at the time of reproduction is also a system used in a conventional optical player. The modulation degree of the reproduction RF signal of the concave pit information and the dot information of the recording surface is used. There is an advantage that it is not necessary to consider the difference between the values and the inversion of the polarity.

The wobbling groove is provided up to the area of the TOC information in which the information is written and the outer periphery thereof.
Music information and its absolute time can be recorded by the wobbling information in this portion.

In another embodiment, the recording wobble is
Bit If it is necessary in the groove G _W in ring region WWA
But it may also be to put the information.

[0015]

According to the optical disk of the present invention, the distance
A recording area in which the first data is recorded in a dispersive pattern
The inner recording area provided on the inner peripheral side of the area includes the second data.
Is modulated by the motor and wobbled in the radial direction.
You. As a result, the type of optical recording material sensitive to laser light
Regardless of the write condition, record the write condition
It can be easily read in the device . Also, the second
The data is in a different format than the first data, ie
Since the data is wobbled in the
The possibility of data being tampered with is reduced .

Further, according to the optical disk reproducing method of the present invention , the laser beam irradiated on the inner recording area of the optical disk is recorded.
By generating a push-pull signal of the laser light,
2 data is reproduced,
Master copy creation is easy, and if you copy the contents of the CD
Both are easily read by a push-pull detector.
What kind of recording material was used
It has the advantage of being applicable to optical discs.
You .

[Brief description of the drawings]

FIG. 1 is a plan view showing an inner track portion of a writable optical disk showing one embodiment of the present invention.

FIG. 2 is a plan view of a conventional writable optical disk.

FIG. 3 is a diagram showing an example of pits of write condition data of a write-type optical disk.

[Explanation of symbols]

WWA Recording wobbling area GW modulated by data of write condition Wobbling group

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Claims (2)

(57) [Claims] 1. The method according to claim 1 , wherein at least a first
And a recording area in which the second data is recorded, and a recording area provided on the inner peripheral side of the recording area.
Inner area modulated and wobbled in the radial direction
Optical disc, characterized in that you are provided with. 2. The method according to claim 1 , wherein at least a first
And a recording area in which the second data is recorded, and a recording area provided on the inner peripheral side of the recording area.
Inner side recording modulated and wobbled in the radial direction
The optical disc having an area on the inner circumference side of the optical disc.
To generate a signal based on the optical push-pull method
Thus the method of reproducing optical disk characterized that you play the second data.