JPS595449A - Recording carrier for optical disk - Google Patents

Abstract

PURPOSE:To realize high-speed access, and also to prevent an intermittent noise from being mixed, by incorporating auxiliary information for reproducing the information into a continuous track like a concentric circle or a spiral. CONSTITUTION:A signal of a waveform is formed on the edge part of a track groove 13 and also a signal element 14 is formed by exposing a resist applied on a glass original disk by a continuous optical beam, and executing a modulation of stress to the optical beam by a signal containing an address signal. An auxiliary signal of the waveform is a phase pattern, and when a recording and reproducing signal is formed by a variable density pattern, the reproducing signal becomes the sum of them, and the S/N ratio is improved. The auxiliary signal and the address signal are not cut off at all, therefore, high-speed access can be realized, and also an intermittent noise is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a record carrier for optical discs for recording and reproducing video signals, audio signals or digital information files, etc. Such a recorded signal can be made into a signal similar to a digital signal by FM modulating a video signal or an audio signal and converting it into a rectangular wave ID signal that rises and falls at the zero cross point. An example of such a conversion method is described in detail in %KOKAI No. 49-65730, so a detailed explanation will be omitted here. 2 obtained in this way
As a method of recording and reproducing value information or digital information, there is a method of optically recording on a disc-shaped rotating record carrier. As recording materials, metal materials, amorphous materials, color materials, etc. are omitted, and 111 low output gas lasers, ]I'
Self-recording can be performed using a light source such as a doko laser or a semiconductor radar. For example, a light beam modulated by Record No. 100 and emitted by a laser beam is focused by a coupling lens into a parallel light beam, which is then irradiated to an objective lens, and an n-pin recorder located at the focal plane of the objective lens is used. Binary recording is made possible by the effect of light energy on 1, 4, and -L.

The recorded signal is a binary signal with exposed and unexposed areas of light. To read the signal, use the VC on the signal.
By irradiating the light beam, the physical effect of the double moon light beam VC can be detected from the four optical emitters V, and the -C1 Seiho Rakukan can be demodulated from the VC. In order to carry out such recording and reproduction with a high-density VC, it is necessary for the VC to irradiate the recording carrier with a light beam in the form of a minute spot during recording and reproduction. β・1j is FJ with a commercially available optical video disc.
The length of the Ig element is about 0.56 to 2 microns, and the length of No. 16 is about 0.4 to 0.6 micron. In order to form such a signal element, it is necessary to make the t'' original beam into a minute spot with approximately the same order of VC, but in such a case, the tolerance for focal position error and centering tolerance for the spot are as follows. A very strict level of holiness is required. For example, the focus position error tolerance is -1.5μ, the track centering tolerance C
i is within ±0.1 to 0.2 micron. On the other hand, it may be necessary to add other information to a zone for recording and reproducing certain information on a record carrier for recording and reproducing. In such a case, when performing so-called add-on recording in which the record carrier is once removed from the apparatus and information is added again, it is necessary to make the record carrier exactly adjacent to the previously recorded information track. For this purpose, grooves are recorded as track guides and a recording material is coated on top of the grooves, or a thin layer with groove guides that is transparent to the light beam is formed on the recording material. It is effective to do so.

Providing such an empty groove guide is a very useful means for performing track tracking to correct tracking errors, and it also reduces tracking errors from -0.1 to -0.1.
It is easy to make it within 0.2 microns. Add-on record - Another important thing is that Hf is fixed.
The purpose of this process is to identify a specific trunk for importing personal records. For this reason, conventionally in VC, an address code for identification is recorded on a part of the track. A conventional and common way of inserting an address code is to intermittently make the groove disappear in a part of the trunk when the groove is formed. The address code is reproduced by detecting the length of the missing M-minute mark or intermittent empty groove.

Figure 1 shows one track of a recording medium containing a conventional general address code, (1) I
rj', ii self-recording carrier substrate, (2) is the recording layer, (3)
is the address code 'r4'' U element.Such address code (3)
The blank n4 (4) can be formed by using substantially the same process for producing optical video discs and continuous discs. That is, the first resist on the glass master is coated with a constant thickness (500~1aooR).
) and expose it to a light beam such as an argon laser to attach the groove pattern. How to record such an address code Q
This has two drawbacks as described below.

1) Since the address code is located in a part of the track, it is necessary to play back one round of the track when playing back the 4' address.

Since the rear address is intermittently 8-C on the track, when playing back old video or audio signals, the address is cut off at the V-address.

The above-mentioned two drawbacks cause the following inconveniences.

In other words, since the address part is contained in a part of the trunk, and the address signal can only be reproduced after the track-period is played, the reproduction time is at least the track-period, e.g. 18 (JOrprn). 6 If the self-recording carrier is rotating, 33m8θC is required.

This is a bottleneck in maintaining address constancy. Also, since there is a missing V on the address or track, if you change the video 1 to the number or audio signal, then in the case of the video signal, by inserting VC during blanking. Although the effect can be removed from the dish surface, intermittent noise is mixed into the audio signal. As a countermeasure to this problem, compress the audio signal and record it to address ■IS.
When playing, you will need to study VC and get +4 temples.

From the above, desirable reasons for Abirev 16 record 1-
■Access the desired track quickly,
It is necessary that as much of Abirev No. 46 as possible is recorded in the track in order to make the Σ. It's delicious, etc.

The present invention &-IJv1 has been made to deal with the problems of the prior art.
(11) Concentric or spiral continuous tracks provided in advance; information recorded on the continuous trunk P)
Providing a recording medium containing supplementary information for life.

Below, 1. The small invention will be explained based on FIG. 1kl showing an embodiment. First, in the first example in Figure 2 VC7, Qv&
J: , j self record” ■Tai J! ! , board, 0'4 is self-recording layer,
04 is a concentric or spiral continuous track groove (empty groove) having an approximately rectangular shape of 11 mm, in which the auxiliary inertia signal is recorded;
0 is a key element for recording and reproducing. Both sides of the 611th track ma'i are formed in a waveform V symmetrically with respect to the center of the track. In the second embodiment VC shown in FIG. 3, the track groove (2) t is formed in a waveform on one side and a straight line on the other side when viewed from the Hirata 1. It is asymmetrical. Other configurations Vi are the same as the first embodiment. Also, in the third application shown in FIG. 4, the track groove (c) is formed symmetrically with respect to the center of the rack with concave and convex surfaces on both sides when viewed from above. The other configurations are the same as in the first embodiment. Furthermore, in the fourth embodiment shown in FIG. The other configurations are the same as the first embodiment. Also in these embodiments, the change in the cross-sectional shape of the track groove tJJ is within 5% of the average area of the cross-section.

In the recording media of the first to fourth embodiments, in order to form the groove edges, the process for manufacturing optical video ice sheets can be used as is. The attached resist is exposed to a continuous light beam.At this time, the optical beam is exposed to a continuous light beam. 1fo4] edge part VC No. 21'J, 1
- It is possible to form a gogo garland as shown in Fig. 5. The width of No. 16 is small enough, shi)] Nitchichiang + pQ
It is desirable to set it as 0.1-0.2 micron degree for 0.8 micron VC. In the drawing, the period of the auxiliary signal including the address signal is extremely exaggerated, and the period is approximately the same as that of the signal for recording and reproduction, but the band of the auxiliary signal is rather low. can do. for example,
The signal band for recording and playback is several megahertz, and the color modulation of TSG is from 3.5 MHz to 13 MH2, and the audio frequency is 2.2 M1 (z ± 100 kHz and 2, BMH
When z±1oOkHz, 6, auxiliary 1 yen is 1oo
It is possible to achieve t1 in the band of several tens of kilohertz below kHz2. In this way, it is possible to achieve complete separation in terms of band, and since the amplitude is also small σ, noise components such as mixed coal σN are also reduced, which is a pf syndrome.

The present invention can also be implemented as shown in Figures 6 and 7 of History VC. In both the embodiments shown in FIGS. 6 and 7, the cross-sectional area of the track groove (C) is varied σ in the length direction of the track groove in which auxiliary information signals are recorded. In the example not shown, the waveform is a waveform, and in the example shown in FIG. 7, the waveform is uneven. The other configurations are the same as in the first embodiment. 6th
In the embodiment shown in the figure, the thickness of the record carrier can be recorded as a change in direction with an auxiliary ring. When changing in the thickness direction, the signal depth needs to be 0.1 micron or less. Further, one of the methods for forming an auxiliary signal such as the embodiment shown in FIG. 7 is a mechanical cutting method. Such a cutting method is, for example, a method in which a copper plate is cut with a diamond cutter mounted on an electrostrictive element.

The auxiliary signal of each embodiment formed in this manner is a phase pattern, and if the recording/reproducing signal is formed as a gray pattern, the reproduced signal will be the sum of both, which has the advantage of being able to alleviate cross-modulation components. That is, in the case of a phase pattern, the light beam to be diffracted generally shows a spatially anisotropic pattern, whereas in the case of a shading pattern, the light beam to be diffracted shows a spatially anisotropic pattern. I don't know anything about it. From VC, it is said that physical changes are the first to be used.
The SA direction of the signal is 11f.

According to Akira Shomoto, 109 auxiliary information is not just information for recognizing a truck, but also information such as audio that is used auxiliary.
It is also possible to use a += signal or an independent / signal as a news signal. At that time, the identification code 4r for identifying the truck can also be used.

As mentioned above, the recorder for optical discs has I/(implementation l-obtained C, and the objective ffu pi was conventionally described in IJ). There is no interruption of VCC Ares No. 1d, and no intermittent noise is introduced.

[Brief explanation of drawings]

Diagram 1 is an enlarged oblique diagram of Abe on the conventional recording carrier, 2nd +,
1 to 7 are enlarged Abe views showing different embodiments of the invention. 01)... Recording carrier substrate, (2)... Recording layer, Q4
...Track groove, 04) ...I divination]-Multi-4
i1] Moto et al. agent Yoshihiro Morimoto Figure 1 Z Figure 2 Figure 4

Claims (1)

[Scope of Claims] - Having concentric or spiral continuous tracks provided in advance for recording and reproducing HV information, and for recording and reproducing information on the continuous tracks. A recording material for optical discs containing supplementary information. z The track has a substantially rectangular cross-sectional shape, and the auxiliary information included in this track VC is distributed by changing the cross-sectional shape of the track. Record carrier 0 3 1 - rank auxiliary information includes an identification code identifying its track. 4. The Mt recording support for an optical disc according to claim 1, wherein the auxiliary information included in the track is recorded by changing the shape of the cross section symmetrically with respect to the center of the track groove. The change in cross-sectional shape of the track is 5% of the average area of the cross-section
The optical disk recording body according to claim 1, which is within the scope of claim 1. 2. The optical disk record carrier according to claim 1, wherein the auxiliary information contained in the track varies in the thickness direction of the track groove.