JPH05189934A - Optical disk of writing type - Google Patents

Abstract

PURPOSE:To obtain the optical disk of a writing type having the consistency with the conventional compact disks. CONSTITUTION:The region WWA of wobbling grooves GW subjected to frequency modulation by recording data (reflectivity, laser power, line speed, etc.) is provided on the innermost peripheral side of the magneto-optical disk and in succession, tracks are formatted so as to form a region TOC where TOC information is recorded. The wobbling grooves GW can be easily provided at the time of production of a master disk and can be easily read out by the conventional CD (LD) player.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a write-once type optical disc capable of recording information on a spiral track by irradiating a laser beam.

[0002]

2. Description of the Related Art An optical disc in which concave pits are spirally arranged on a recording surface of an optical disc and the dimensions of the concave pits are modulated based on recording information so that a digital audio signal or a video signal can be reproduced. (C
D, VD) is widely used, but pits are formed on such a read-only optical disk by a recording medium whose reflectance changes when irradiated with laser light or by heat generated when irradiated with laser light. A writable optical disk capable of recording and reproducing information using a recording medium that can be formed is also in the stage of practical application.

In such a writable optical disk, it is usually necessary to form a spiral pre-groove in advance on the recording surface of the optical disk in order to guide a laser beam for writing, and at the same time, writing is performed. For this purpose, the laser power, the reflectance of the recording surface, the linear velocity of the optical disc, the strategy of the write pulse, etc. are added in advance to the innermost track of the optical disc as information required for recording.

FIG. 2 shows an example of the pre-formatting of such a writable optical disc. The disc shape (inner diameter r ₁ , outer diameter r ₂ ), track pitch, etc. is the current CD.
(Compact disc) and is almost the same. The recording surface is formed of a film of an organic dye material or an inorganic material that is sensitive to light.

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

[0006]

However, in a write-type optical disc having an organic dye material or the like as a recording surface, the modulation degree of the RF signal obtained by the pits P of the recording data area WFA which is formed in advance and the When the recorded information is reproduced, there may be a considerable difference in the degree of modulation of the RF signal, which causes a problem when the reproduction player reproduces the copied optical disk as it is. When the recording surface of the writable optical disc is made of a material (photosensitive material) whose reflectance changes in response to light, the recording data area WF described above is used.
There is a problem that the reproduction RF signal of A and the reproduction RF signal of the recorded dot information have different polarities, and a special reproduction system is required due to the difference.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the recording conditions of the optical disk are set so that the optical disk is a writable optical disk that is as consistent as a conventional CD. The wobbling groove modulated by the data of the recording condition is provided in advance in the formed area.

[0008]

The groove having the wobble period modulated by the data of the optimum recording conditions (reflectance, laser power, linear velocity, and the modulation pulse waveform for setting the pit shape) required for the writable optical disk is provided. Therefore, at the time of recording, while the wobbling groove indicating the recording data is detected by the push-pull method or the like and the recording condition is set, the recording content of the CD or the like is copied,
Also, during reproduction, the information written by a normal CD reproduction player can be reproduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a write-type 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 circumference side is recorded. Area WWA) is shown. That is, from the innermost circumference r ₀ of the writable optical disc, for example, in the region where r = 23 mm, the frequency is modulated by the data indicating the recording condition that specifies the linear velocity, the reflectance, the laser power and the like of the disc. Warbling Groove G
Only _W is formed.

Then, the recording wobbling area WW
In the area of radius r = 25 mm following A, the TOC information of the CD is recorded, and further, the acoustic information of the CD and the like are further recorded. Such a writable optical disc has an advantage that an optical modulator is not needed, because only an optical deflector needs to be prepared at the time of mastering (when manufacturing a master disc).

Further, in the case of a write type optical disk formed in such a pre-format, since the condition data for writing is only the wobbling groove G _W , it is the same as the recording dot information of the conventional CD. It can have the same pattern. In particular, since the wobbling groove G _W modulated with the data of the recording condition can be easily read by, for example, a push-pull method detector, the recording player can use the push-pull method to perform tracking. The present invention can be applied to an optical disc using any recording material, and the recording system can be unified.

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

The wobbling groove is provided up to the area of TOC information in which information is written and its outer periphery.
It is possible to record the music information and its absolute time by the wobbling information of this portion.

As another embodiment, pit information may be put in the groove G _W in the recording wobbling groove area WWA if necessary, and the wobbling area WWA is provided at the outermost circumference of the disc. You can

[0015]

As described above, in the write-type optical disk of the present invention, since the data indicating the recording condition for writing is formatted by the wobbling groove, the kind of the optical recording material sensitive to the laser beam is used. The writing conditions can be recorded regardless of the above, and the writing conditions can be easily read by the recording device.

Further, it is easy to manufacture a master of a writable disc, and it is possible to make a full copy of the information of the CD on this writable optical disc and easily read it by a conventional CD player or the like. ..

[Brief description of drawings]

FIG. 1 is a plan view showing an inner peripheral track portion of a write-type optical disc according to an embodiment of the present invention.

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

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

[Explanation of symbols]

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

Claims (2)

[Claims] 1. A writable type optical disc which is capable of recording information in response to light is pre-formatted on a recording surface of a writable optical disc which is modulated by data required for writing. optical disk. 2. The writable optical disc according to claim 1, wherein the wobbling group is formed on a part of a track on an inner peripheral side of the optical disc.