JPS58102347A - Optical disk record carrier - Google Patents

Abstract

PURPOSE:To manufacture a carrier easily, by forming relief pits and guide grooves which are one-eighth as deep as the wavelength of light in use, and recording a signal along the guide grooves, and detecting the signal from relief pits and recording pits. CONSTITUTION:In a substrate 2, relief pits 1 and guide grooves 2 which are one-eighth as deep as the wavelength of light in use are formed, and a recording medium 4 is adhered. In the manufacture of an original disk, the thickness of a photosensitive film is controlled to be lambda/8 depth and relief pits 1 and guide grooves 2 corresponding to an address signal are both recorded easily by allowing power to operate once. A desired address is found by reflected light from relief pits to modulate laser light along the guide grooves 2 by a signal, and the recording medium 4 is heated to form recording pits 5. For reading operation, different voltages are developed in areas of relief pits and guide grooves to detect both an address and a recording signal. Thus, the manufacture of the original disk is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a single recording carrier used in an optical multiplex recording and reproducing device that can record, search and reproduce information at a high density.

Conventionally, as such an optical tissue, there is a tissue having a guide groove as shown in FIGS. 1 and 2, which is called a pre-grooved tissue. Figure 1 is a cross-sectional view;
FIG. 2 is a partial view. The TiSF shown in Figures 1 and 2 has a quarter wavelength (1/4 wavelength) of the laser beam used in advance.
A relief bit (1
) and a recording medium (4
). An optical tissue display device for recording and reproducing information on such a tissue uses laser light without rotating the tissue shown in Figures 1 and 2.
I visited the recording medium (4) with a laser beam to write the song, and I was able to do it, so I stayed in the gamma grain (2) and recorded it on the recording medium (4). Information is recorded by making a hole (hereinafter referred to as a recording bit (5)) by thermal processing, and for reproduction, a laser beam with an illuminant output is applied to the tiff surface t.
This is done by detecting how the reflected light from the direction of the recording medium changes depending on the exposure.

To make the light teeth with the above-mentioned relief bit (]) and guide light (2), the relief bit () is attached to the base (3).
1) and a guide groove (2) must be provided. One of these methods is to irradiate the master disc with a laser beam to remove the relief bit (1) and guide cut (2).
] is recorded, a mask board is made, and the base (3) is made by injection molding.

Next, we will explain the operation of L, leaf pill"('), and guide groove (2).
was created with the aim of making simple, anti-random access recording and playback possible. Relief bit (1) has Utanu access.
An address signal is recorded, and by scanning the laser spot, the reflected light from the relief pick l-(11) is detected, and the address desired for recording/reproduction is selected.

In this case, the 493-bit IF1 has a phase difference of 4I in order to capture the intensity change of the light caused by the interference of the anti-S=1 light from the low bit and the no-hit area.

When this phase difference is S/2, the modulation rate of light becomes maximum and the amount of reflected light becomes minimum. The light intensity change (a) is J). On the other hand, guide rli
(21 is the one that moves as a soking guide that performs Hatakedensity Bakitaku, and as mentioned above, there is a change (b) in the amount of light due to the phase difference. The depth of the laser beam is λ/8, which is half of that of the relief hit.By capturing this amount of light, the scanning laser spot is prevented from deviating from the guide groove (2). By multiplying by When the medium is 1.(
C1) occurs, this is detected and the reference level is set to the third level.
As shown in Figure (d), by setting it to a constant value and passing it through the electric juice comparison circuit, you can obtain a regenerated signal with r.

In the case of a conventional optical disk having a relief bit (1) and a guide groove (2), the depth is changed at the relief bit (1) and the guide groove (2). We must change and create a foundation (3). In order to do that, we need to create the original version when we install the base. At 1X, it is necessary to make the relief bit (1) a depth of λ/4, and the guide groove (2) a depth of 1J, λ/8. Make these: In order to achieve this, the output of the laser light irradiated onto the rotating master must be changed accurately at high speed. Also, the depth of λ/4 is Io of the master
Although the thickness of the optical film can be controlled accurately, the depth of λ/8 can only be controlled by the output of the laser beam, which is difficult.

This invention was made to eliminate the drawbacks of the conventional ones as described above, and by unifying the depth of the relief bit (11) and the guide groove (2) to λ/8, the depth of the base (3
), and an optical tisf record carrier capable of extracting the signal from the relief bit (1) and the signal from the recording bit (5) recorded along the guide groove (2). is intended to provide.

An embodiment of the present invention will be described below with reference to the drawings. Fourth
The figure is a cross-sectional view of the optical tissue, and FIG. 5 is a partial view. This optical tissue has a recording medium (4) adhered to the surface of a base (3) on which relief bits (1) and guide grooves (2) having a depth of λ/8 are formed in advance. As described above, methods such as injection molding are used to make such a base (3), but in the present invention, the method for producing the master is easier than the conventional method. In the present invention, since the depths of the relief bit (1) and the guide γ# (2) are unified to λ/8, it is possible to , it is possible to easily record both the relief bit (1) corresponding to the address signal and the guide groove (2) with one stroke power without switching the power.

The sixth factor is the intensity change of the reflected light obtained by scanning the laser beam along the bit string of the relief bit (f) shown in FIGS. 4 and 5.
In the part 1), there is a change indicated by (al) in Figure 6,
In the guide groove (2), there is a change in the amount of light (b), and (0) corresponds to the recording bit (5) recorded along the guide groove (2). In order to extract a signal from this strange change in light intensity, if the reference level of the voltage comparator circuit is set as shown in (d) as in the past, the address signal will not be detected, so (e) By switching the reference level between the guide groove (2) and the relief bit (1), it becomes possible to detect all signals.

In the above embodiment, the depth of the relief bit and guide groove is
Although the explanation is given as l/'8^, it is natural that the same effect can be obtained in practice as long as this explanation can be applied even from λ/8.

As described above, according to the present invention, it is possible to easily produce one tree guide groove (2) in which an address signal is recorded, and moreover, it is possible to detect both the address signal and the recorded signal. It has the effect of being able to

[Brief explanation of the drawing]

Figure 1 shows the conventional relief bit (1) and the inner groove (2).
), FIG. 2 is a plan view of FIG. 1, FIG. 3 is a diagram showing changes in reflected light from the conventional optical disk of FIG. FIG. 5 is a cross-sectional view showing an optical tisf according to an embodiment of the present invention; FIG. 5 is a plan view of FIG. 4;
The figure is a diagram showing changes in reflected light from the optical tissue of the present invention in FIG. 4. In the figure, (1) is a relief bit, (2) is a guide groove,
(3) is a base wall, (4) is a recording medium, and (5) is a recording bit.1 Note that the same reference numerals in the figures indicate the same parts. Agent Kuzuno - Figure 1 Figure 2 Figure 3 d) 净1.1'Government Office], 3 Government Offices 1. Display of matter t1 Patent application 1986-200517
No. 2, Name of the invention Optical disk record carrier 3, Person who straightens the sleeves 5, Subject of sleeve closure (Momman (2) Name of the invention in the IJ application (2) Detailed description of the invention in the specification and Kaede (brief description of the drawings) (Replace the phrase “information” on the 9th line of page 2 of the 21 specification with 1)
"Information," he corrected. (3) On page 7, line 15, “base wall” is replaced with “foundation”
I am corrected. Above (phantom)

Claims (1)

[Claims] (1) Equipped with a relief bit with a depth of about 1/8th of the length of the light to be used and a guide groove with a depth of about 1/8th of the length of the limb. An optical optical record carrier characterized in that it is possible to detect signals from both bits and recorded bits.