JPH03241538A - Optical recording medium disk - Google Patents

Abstract

PURPOSE:To easily obtain the optical recording medium disk which can satisfy various specification by constituting the disk in such a manner that the state of the reflected light from a ROM region and the state of the reflected light from a RAM region attains approximately the same state. CONSTITUTION:Bits G0, G0... of a width W1 and depth d1 are constituted by an information signal in the ROM region of a substrate 1 by information signals ad guide grooves Ga for tracking of a width W2 and depth d2 are constituted in the RAM region. The refractive index of an org. material film 2 in the state in which the film is not irradiated with light for recording is designated as n1 and the refractive index of the film 2 in the state in which the film is irradiated with the light an n2 at this time. The optical depth in the part of the bit G0 in the ROM regions where the film 2 being put in the state of the refractive index n1 at all times exists is made into the same optical depth as in the bit part of the disk by setting the depth of the film 2 of refractive index n1 exiting in the part of the bit G0 in the ROM region.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical recording medium disk, and in particular to a write-once optical recording medium disk that is compatible with compact discs.

(Prior Art) As the demand for recording various information signals at high recording densities has increased, in recent years, information recording media created based on various structural and operating principles have been used to record information signals at high recording densities. It is well known that high-density recording and reproduction of information is now being performed. Recording and reproducing devices that reproduce information signals by optical means or by detecting changes in capacitance values are already in practical use for recording and reproducing video and audio signals.

In addition, in order to meet the demands for high-density recording and reproduction in various technical fields, by irradiating the recording layer of the information recording medium with a beam whose intensity is modulated by the information signal, the recording layer of the information recording medium can respond to the information signal. Research has also begun on information recording media that record information signals by causing physical or chemical changes, but in recent years it has become easier to obtain semiconductor lasers that operate stably. Along with this, various optical recording media (which use laser light for high-density recording and reproduction)
optical discs) have already been put into practical use.

It is well known that research and development for practical application is currently underway.

In other words, recorded optical discs (playback-only optical discs) that have been copied in large numbers from master discs on which information signals are recorded using pits formed as geometrical concave or convex parts are 1, for example, video discs, compact discs, etc. In addition, optical discs that can be added and recorded only once by the user (write-once optical discs) and erasable optical discs are being put into practical use for office file memory and other uses. Research and development is being actively carried out for this purpose.

By the way, when reproducing information signals from an information recording medium on which information signals are recorded at high density, tracking control is used to ensure that the reproducing element or the reproducing beam always accurately follows the recording trace where the information signals are recorded. For example, a spot of light with a minute diameter is projected onto the signal surface of an information recording medium,
As a tracking error detection method used for tracking control in an optical information signal reproducing device that reproduces information signals based on reflected light whose intensity is modulated by pits formed on the signal surface, The tracking error is detected by utilizing the fact that the intensity distribution of the reflected light is biased due to the tracking error. The so-called push-pull tracking error detection method is widely used because the optical system has a simple configuration and is advantageous in terms of cost. on a straight line that projects a first light spot for and includes the first light spot.

Projecting second and third light spots for tracking at symmetrical positions with the first light spot as the center of symmetry,
The second point mentioned above. It is well known that a tracking error detection method that detects a tracking error based on the reflected light generated on the signal surface of the information recording medium by the third light spot has also been used. When reproducing information signals recorded at high density on various types of information recording media, the reproducing operation is usually performed under tracking control operation.

Now, a compact disc is known as an information recording medium in which information signals are recorded at high density by an array of pits corresponding to the information signals on the signal surface of the information recording medium. Information signals are recorded on the signal surface by an array of pits with depths set in a specific relationship to the wavelength, and the entire surface of the signal surface is coated with a thin film of aluminum or the like. It is specified that the reflectance of the land portion on the signal surface is 70% to 90% for light with a wavelength of 780 nm, and the readout of information signals from the signal surface of the information recording medium is This is done using a 780 nm light spot.

When reading an information signal from the above-mentioned compact disc, the amount of light reflected from the pit portion on the signal surface is greater than the amount of light reflected from the land portion as a result of light interference occurring at the pit portion. This is done by taking advantage of the fact that the amount of light is reduced compared to the amount of light, and the tracking error information is also based on the amount of light reflected from the recorded trace.
It is obtained by using the difference between the amount of light reflected from the land portion and the amount of light reflected from the land portion.

Now, with the spread of the above-mentioned compact disc, one optical disc that is compatible with the compact disc and can be played using a compact disc player is, for example, a recorded area for playback only (hereinafter referred to as ROM
A recording area that can be used as a write-once optical disc (hereinafter referred to as a RAM area...random access memory area...) Various proposals have been made for a write-once optical disc with a RAM area, or an optical disc where the entire surface is a recording area. Optical discs are configured such that tracking control is performed even during recording, and a guide groove for tracking is provided on a transparent substrate.

By the way, as an optical disc that is compatible with compact discs, it goes without saying that compact discs are
Various standards regarding playback established for discs,
In other words, it must satisfy standard values for reflectance, modulation degree of high-frequency signals, symmetry of high-frequency signals, tracking signal output, crosstalk, etc., but it must also satisfy standards for playback on compact discs. Specifications related to playback on compact discs that are particularly problematic when trying to obtain write-once optical discs that have good compatibility include reflectance, modulation degree of high-frequency signals, tracking signal output, etc. It will be done.

Here, when attempting to configure a write-once optical disc that is compatible with compact discs, it is necessary to refer to the various standards regarding reflectance, modulation degree of high-frequency signals, tracking signal output, etc. stipulated for the above-mentioned compact discs. The following is an overview of the problems that arise when constructing a write-once optical disc that satisfies the following.

First, the standard value for reflectance on compact discs is that the wavelength is 780 nm from the readout side of the optical disc.
The optical disc is required to have a reflectance of 70% or more when viewed from the readout side when a laser beam of Even if we consider only the reflection loss at
In order to make it 0% or more, the reflectance of the metal reflective film needs to be at least 80% or more.

It is well known that compact discs use an aluminum reflective film that exhibits a reflectance of 80% or more, satisfying the standard value for reflectance.

However, in write-once optical discs, since recording is performed on the recording film, energy for recording is absorbed into the recording film, and as mentioned above, in write-once optical discs, recording is performed for tracking control during recording. In addition, since the transparent substrate is provided with guide grooves for tracking control, the incident light is diffracted by the guide grooves, resulting in a loss of light quantity, which reduces the reflectance on the read side of the optical disc to a level similar to that of a compact disc. Conventionally, it was considered difficult to set the reflectance to a standard value.

In addition, when attempting to construct a write-once optical disc that is compatible with compact discs, it is necessary to construct a write-once optical disc that can satisfy the standards for the degree of modulation of high-frequency signals stipulated for the above-mentioned compact discs. In this case, there are the following problems.

In other words, since compact discs use light diffraction by pits to read out information signals, it is easy to meet the standard value for the degree of modulation of high-frequency signals. In general write-once optical discs, the mode of recording on the recording film is as follows.
For example, it is based on perforation or phase change, and readout of recorded information signals is performed by change in reflectance. The difference between the light reflectance of the recorded portion (corresponding to the pit) due to the change, that is, the modulation degree of the high-frequency signal, is small, so the difference in the modulation degree of the high-frequency signal specified for compact discs is small. It was not possible to meet the standards.

In order to satisfy the compact disc standard value for the degree of modulation of high-frequency signals, even in write-once optical discs, it is necessary to read out information signals using diffraction of light by bits. It is likewise considered necessary that the readout of the information signal be effected by means of a phase structure.

Next, when attempting to construct a write-once optical disc that is compatible with compact discs, it is necessary to construct a write-once optical disc that can meet the standards for the output level of the tracking signal stipulated for the compact discs mentioned above. When doing so, there are the following problems.

That is, the output level of the tracking signal on an optical disc is generally determined by the phase structure determined by the shape of the pit or the tracking guide groove provided on the transparent substrate, but even in a write-once optical disc,
It is necessary to make the output level of the tracking signal satisfy the standard value while satisfying other characteristics.

However, in the general write-once optical discs that have been proposed in the past, when recording is performed on the recording film by, for example, drilling holes, the shape of the guide groove for tracking is determined by the holes. Since the phase structure is disturbed, it is difficult to obtain a tracking signal with a desired output level.

Based on the explanation so far, if you are trying to configure a write-once optical disc that is compatible with compact discs,
There are many problems in ensuring that various characteristics such as light reflectance, modulation degree of high-frequency signals, and tracking signal output during playback meet the standards specified for compact discs, and conventional For some write-once optical discs, it has been difficult to provide a write-once optical disc that is compatible with compact discs.

As an optical recording medium disc that can solve the various problems mentioned above, the applicant company has previously filed Japanese Patent Application No. 1-4044.
According to the No. 1, a recording laser beam having a predetermined wavelength is emitted onto a transparent substrate provided with a guide groove for tracking and the surface of the transparent substrate on which the guide groove for tracking is provided. The film thickness d of the guide groove portion for tracking on the transparent substrate containing the organic material film whose refractive index changes by absorbing an appropriate amount of the laser light when irradiated with the transparent substrate, and the thickness d of the guide groove portion for tracking on the transparent substrate. In an optical recording medium in which a metal film for light reflection is provided on the organic material film, tracking on the transparent substrate is performed. The position generated in the above-mentioned portion of the transparent substrate with the guide groove for tracking and the portion of the transparent substrate other than the guide groove for tracking with respect to the laser beam incident from the side of the plate where the guide groove for tracking is not provided. The phase difference is reduced compared to the phase difference obtained in the absence of the organic material film by using the change in the optical path length due to the difference Δd in the thickness of the organic material film, and the substantial phase difference is made transparent. By making the phase difference smaller than the value of the phase difference determined by the groove shape on the substrate, and by utilizing the phase advance caused by the change in the organic material film in the recorded area, the optical axis of the laser beam is substantially lower than that in the unrecorded area. We proposed an optical recording medium disk that advances the phase of the optical recording medium.

FIG. 3 is a longitudinal sectional side view of an example of the configuration of the optical recording medium disk previously proposed by the applicant company, and this optical recording medium disk has guide grooves G, G, G, and G for tracking.
In the ROM area, on the surface of the transparent substrate 1 on which the guide groove G for tracking is provided, metal films 3 and 1 for light reflection and a protective film 4 made of, for example, an ultraviolet curing resin are sequentially applied. In addition, in the RAM area, when a recording laser beam having a predetermined wavelength is irradiated onto the surface of the transparent substrate l on which the guide groove G for tracking is provided, the an organic material film 2 (hereinafter sometimes referred to as organic material record llI2) whose refractive index changes by absorbing an appropriate amount of laser light;
and a metal film 3 for light reflection.

For example, a protective film 4 made of an ultraviolet curable resin is successively applied, and a metal film 3 for light reflection is provided.

The ROM area in the optical recording medium disk described above has the same configuration as that of a normal compact disc, and its playback operation is well known. Furthermore, the ROM area in the optical recording medium disk described above is
A recording medium having a predetermined wavelength is placed on the transparent substrate on which the tracking guide grooves G, G,... are provided. When the laser beam is irradiated, the organic material recording film 2 attached to the transparent substrate 1 absorbs an appropriate amount of the laser beam, and its refractive index changes.

The above-mentioned organic material recording film 2 has a film thickness of d at the tracking guide grooves G, G, .
The film thickness of the portion other than G... is (d-Δd).

Then, the tracking guide grooves G in the transparent substrate 1 in the laser beam incident from the plate surface side where the tracking guide grooves G, G, etc. are not provided in the transparent substrate 1 described above.

The phase difference generated between the portion G and the portions other than the tracking guide grooves G and G on the transparent substrate is compared to the phase difference obtained in the absence of the organic material recording film 2 described above. Therefore, the optical path length is reduced due to the difference Δd in the film thickness of the organic material recording film 2 described above, and the substantial phase difference of the laser beam is smaller than the value of the phase difference determined by the groove shape in the transparent substrate l. In addition, due to the phase advance caused by the change in the organic material recording film 2 in the recorded portion, the optical phase of the laser beam in the recorded portion is substantially advanced compared to the unrecorded portion. By this, the reflectance of light during playback,
To provide an optical recording medium disk whose characteristics such as the degree of modulation of a high frequency signal, the output of a tracking signal, etc. can meet the standards specified for compact disks, that is, a write-once optical disk compatible with compact disks. (Please refer to the specification of Japanese Patent Application No. 1-4044 for details of the previously proposed optical recording medium disk.)

(Problem to be Solved by the Invention) By the way, in a write-once optical disc that is compatible with the previously proposed compact disc that is equipped with the ROM area and RAM, as shown in FIG.
In the area, there is a guide groove G for tracking on the transparent substrate.
Metals II3 and 1 for light reflection are placed on the side of the plate where
For example, while the protective film 4 made of ultraviolet curable resin is sequentially attached, in the RAM area, the transparent substrate 1
On the plate surface on which the guide groove G for tracking is provided, there is an organic material recording film 2 and a metal 11I3 for light reflection.
For example, since the structure is such that a protective film 4 made of an ultraviolet curable resin is sequentially adhered and a metal film 3 for light reflection is provided, when manufacturing it, a protective film 4 made of an ultraviolet curable resin is sequentially attached, and therefore, when manufacturing it, a protective film 4 made of an ultraviolet curable resin is sequentially applied, and a metal film 3 for reflecting light is provided on the transparent substrate 1 corresponding to the ROM area. Therefore, when forming the organic material recording film 2 by applying the spin code method, it is necessary to prevent the above-mentioned organic material @2 from being formed in the RAM area. (Indicated by reference numeral 5 in FIG. 3, but in FIG. 3, it is shown as several times the track pitch due to the size constraints of the drawing.) It occurs that the total storage capacity of the optical recording medium disk is reduced because of the need to provide the ROM area between the ROM area and the RAM area.

In addition, when the organic material recording film 2 is constructed by applying the spin code method as described above, a ROM area is provided in the inner peripheral part of the optical recording medium disk, and a RAM area is provided in the outer peripheral part than the RROM area described above. In addition to the constraint that it is necessary to provide multiple RAM areas and multiple RO
There are problems such as the inability to create an optical recording medium disk having a mixed M area, and a solution to this problem has been sought.

(Means for Solving Problem 11) The present invention provides pits in the ROM area and tracking guide grooves in the RAM area of the ROM on the side of the transparent substrate where the tracking guide grooves are provided.
an organic material recording film whose refractive index changes by absorbing an appropriate amount of the laser beam when irradiated with a recording laser beam having a predetermined wavelength is attached to the entire area of the area and the RAM area; Further, when a metal film for light reflection is provided on the organic material recording film, and the same recording information is recorded in both the ROM area and the RAM area,
When reproduction light of the same wavelength and the same light intensity is incident on the ROM area and the RAM area, the state of the reflected light from the ROM area and the state of the reflected light from the RAM area are approximately the same. The present invention provides an optical recording medium disk in which the optical depth of pits in the ROM area and the optical depth of tracking guide grooves in the RAM area are defined.

(Function) In the transparent substrate where the pits in the ROM area and the guide groove for tracking in the RAM area are provided, the entire area between the ROM area and the RAM area on the side where the pits and the guide groove for tracking are provided. , attaching an organic material recording film whose refractive index changes by absorbing an appropriate amount of the laser light when irradiated with a recording laser light having a predetermined wavelength; A metal film for light reflection is provided in the ROM area, the depth of the guide groove for tracking in the RAM area, the refractive index change characteristics of the organic material recording film, and the thickness of the organic material film. The optical depth of the pit portion in the ROM area and the optical depth of the tracking guide groove portion in the RAM area, which are determined by In this case, when the reproduction light of the same wavelength and the same light intensity is incident on the ROM area and the RAM area, the state of the reflected light from the ROM area and the state of the reflected light from the RAM area are Since the configuration is such that the states are almost the same, it is easy to create a write-once optical information recording medium disk that can meet the various standards specified for compact disks using a playback mechanism based on the phase structure. can be obtained.

(Example) Hereinafter, detailed contents of the optical recording medium disk of the present invention will be specifically explained with reference to the accompanying drawings.

FIGS. 1 and 2 are side sectional views showing different configuration examples of the optical recording medium disk of the present invention.

The optical recording medium disc of the present invention shown in FIGS. 1 and 2, respectively, is compatible with compact discs that can be played using a compact disc player. , recorded area for playback only (ROM
A recording area (RAM area: random access memory area) that can be used as a write-once optical disc is provided.

In FIGS. 1 and 2, the reference character is a transparent substrate made of polycarbonate resin, for example, and this transparent substrate 1 has a width Wt in its ROM area according to an information signal.
Pit Go with depth dl.

In addition, in the RAM area of the transparent substrate 1 of the optical recording medium disk shown in the first figure, there are tracking guides 11Ga having a width of W2 and a depth of dl,
The RAM area on the transparent substrate 1 of the optical recording medium disk shown in the second figure has a width W.
Tracking guide grooves Ga, Ga・with a depth of d3 at
...is configured. The width of the pit GO and the width of the tracking guide groove Ga are the width of the pit GO in the direction perpendicular to the direction in which the recording trace (track) of the optical recording medium disk extends, and the width of the tracking guide groove Ga. The width is

The widths and depths of the pit GO and the tracking guide groove Ga are as follows.

Width Wl of pit GO - 400 nm to 700 nm, depth of pit GO - 80 nm '' 150 nm, RA on transparent substrate l inside the optical recording f body shown in the first figure
The width W2-500 of the tracking guide groove Ga provided in the M area is 1000 nm, and the depth of the tracking guide groove Ga provided in the RAM area in the transparent substrate l of the optical recording medium disc shown in the first diagram. dl-40nm
~90 nm, width Wl of the guide groove Ga for tracking provided in the RAM area in the transparent substrate 1 of the optical recording medium disc shown in the second diagram - 400 to 700 nm, the transparent substrate of the optical recording medium disc shown in the second diagram Depth d of the tracking guide groove Ga provided in the RAM area in 1
3 = 40 nm - 90 nm The cross-sectional shape of the pit GO in the plane perpendicular to the direction in which the recording traces (tracks) of the optical recording medium disk shown in the figure extend is rectangular (actually, it may be trapezoidal). The tracking guide groove Ga has a triangular shape, and the pit G and the tracking guide groove Ga are formed in a plane perpendicular to the direction in which the recording trace (track) of the optical recording medium disk shown in the second figure extends. The cross-sectional shape is rectangular (actually, it is often trapezoidal).

The entire area of the ROM area and RAM area on the surface of the transparent substrate 1 on which the pit GO in the ROM area and the tracking guide groove Ga in the RAM area are provided is coated with a predetermined wavelength (for example, 780 nm). An organic material recording film 2 whose refractive index changes by absorbing an appropriate amount of the laser light when it is irradiated with a recording laser light having a wavelength) is deposited and formed by applying a spin code method.
The above-mentioned organic material recording film 2 has a thickness t on the surface of the transparent substrate 1 of, for example, 30 to 60 nm.

The above-mentioned organic material recording [2] is, for example, a heat mode optical recording material using an organic dye or a material in which an organic dye is dispersed in an organic material, or a heat mode optical recording material using an organic dye or a material in which an organic dye is dispersed in an organic material. Use an organic optical recording material selected from photon mode optical recording materials, or optical recording materials using organic dyes that operate in both heat mode and photon mode, or materials in which organic dyes are dispersed in organic materials. However, the refractive index n of the organic material recording film 2 in a state where the recording laser beam is not irradiated is, for example, the real part is +2°65 and the imaginary part is -0.
, 05 can be used.

Further, a light reflecting metal @3 is provided on the organic material recording film 2, for example, by applying a vapor deposition method or a sputtering method. The metal film 3 described above can be constructed using a metal with a high reflectance, such as gold, aluminum, steel, etc., or an alloy with a high reflectance.

The optical information recording medium disk of the present invention as shown in the construction drawings and FIG.
A stamper having a convex portion corresponding to a guide groove for tracking in the AM region can be made and mass-produced.

Now, the optical recording medium disk of the present invention shown in FIGS. 1 and 2 has pits Go and Go in the ROM area.
...and a guide groove G for tracking in the RAM area
pits Go, Go... and tracking guide grooves Ga, G in the transparent substrate 1 provided with a, Ga...
ROM area and RA on the side where a... and are provided
An organic material recording film 2 whose refractive index changes by absorbing an appropriate amount of the laser beam when it is irradiated with a recording laser beam having a predetermined wavelength is attached to the entire area between the M area, and , a metal film 3 for light reflection is provided on the organic material recording medium 112, and the RAM area and ROM in an optical recording medium disk having such a configuration are
Both regions meet the standards defined for compact discs by the reproduction mechanism performed by the phase structure, namely reflectivity, modulation degree of high frequency signal, tracking signal output, In order to satisfy various standards regarding the above, it is necessary that both the above-mentioned RAM area and ROM area have substantially the same topological structure as that of a compact disk.

By the way, in the optical recording medium disk of the present invention shown in FIGS. 1 and 2, since the organic material film 2 is also present in the RAM area, the pit Go to be provided in the ROM area is , Go... must also be set to such a depth that the phase shift imparted to the reproduction light by the organic material film 2 can be compensated for. Pit Go to be provided.

It goes without saying that the depth dl of GO... is different from the pit depth (Blonm) in the compact disc.

Now, the refractive index of the organic material film 2 in a state not irradiated with recording light is nl, and the refractive index of the organic material film 2 in a state irradiated with recording light is lI! If the refractive index of 2 is nl, the organic material film 2 in the ROM area of the optical recording medium disk of the present invention shown in FIGS. 1 and 2 is not irradiated with recording light. Therefore, the organic material 1112 in the ROM area in the optical recording medium disk is always in a state of refractive index of nl, but the organic material film 2 in the RAM area in the optical recording medium disk is not irradiated with recording light. The portion is brought to a refractive index of nl, and the portion irradiated by the recording light is brought to a substantially refractive index of nl.

The optical depth of the pit GO portion in the ROM area where the organic material film 2, which is always kept in the refractive index state of nl as described above, exists is the same as the optical depth of the pit portion of the compact disc. This can be realized by setting the depth of the organic material film 2 with a refractive index nl existing in the pit Go portion in the ROM area.

Furthermore, in the RAM area of the optical recording medium disk, in the guide groove Ga for tracking, there is an organic material film 2 whose refractive index is nl without being irradiated with the recording light. The optical depth of the part is made to be the same as the optical depth of the land part in the compact disc, and tracking information can also be obtained based on the presence of the tracking groove Ga. In addition, the guide groove G for tracking is
As mentioned above, the optical depth of the part a where the organic material film 2 is irradiated with recording light and has a refractive index of substantially nl is always equal to the refractive index of nl as described above. The optical depth of the pit Go in the ROM area where the organic material film 2 exists, that is, the optical depth of the pit Go of the compact disc, is required to be approximately the same as the optical depth of the pit Go of the compact disc. However, this is due to the organic material film 2 existing in the tracking groove Ga.
This can be easily achieved by setting the depth of the organic material film 2 and selecting an organic material that exhibits a predetermined refractive index change characteristic as the organic material used in the structure of the organic material film 2 described above.

As mentioned above, in order to set the optical depth of each part in the ROM area and RAM area, the tracking guide groove Ga has a cross-sectional shape like the optical recording medium disk shown in FIG. It may be triangular, or it may be rectangular in cross-section like the optical recording medium disk shown in FIG.

In the optical recording medium disks shown in FIGS. 1 and 2, the depth dl of the pit GO provided in the ROM area and the tracking guide groove Ga provided in the RAM area are Depth d2. The relationship with d3 is di>d2. Although it is shown that di>d3, if the optical depth of each part in the ROM area and RAM area is set as specified, the depth di of the pit Go provided in the ROM area and the depth d of the tracking guide groove Ga provided in the RAM area.2.
The relationship with d3 is not limited to that shown by the above-mentioned inequality.

(Effects of the Invention) As is clear from the above detailed explanation, the optical recording medium disk of the present invention has pits in a transparent substrate provided with pits in the ROM area and guide grooves for tracking in the RAM area. When a recording laser beam having a predetermined wavelength is irradiated to the entire area of the ROM area and RAM area on the side where the tracking guide groove is provided, the appropriate amount of the laser beam is applied. At the same time, a metal film for reflecting light is provided on the organic material recording film, and the depth of the pit in the ROM area and the tracking in the RAM area are The depth of the guide groove for
The optical depth of the pit portion in the ROM area and the optical depth of the tracking guide groove portion in the RAM area are determined by the refractive index change characteristics of the organic material recording film and the thickness of the organic material film. However, when the same recording information is recorded in both the ROM area and the RAM area, when the reproduction light of the same wavelength and the same light intensity is incident on the ROM area and the RAM area, the R
Since the configuration is such that the state of the reflected light from the OM area and the state of the reflected light from the RAM area are approximately the same, compact discs are defined by the reproduction mechanism performed by the phase structure. It is possible to easily obtain an optical recording medium disk that satisfies various standards, that is, standard values for reflectance, modulation degree of high-frequency signals, symmetry of high-frequency signals, tracking signal output, crosstalk, etc. , according to the invention ROM
Therefore, an optical recording medium disk with a large storage capacity can be provided without requiring a particularly wide space between the RAM area and the RAM area. A ROM area is provided on the inner circumference of the medium disk, and a RAM is provided on the outer circumference of the RROM area.
There is no restriction that it is necessary to provide an area, and furthermore, it is possible to easily manufacture an optical recording medium disk in which multiple RAM areas and multiple ROM areas are mixed, which solves the problems of existing proposals. points can be easily resolved.

[Brief explanation of drawings]

Fig. 2 is a side sectional view showing different configuration examples of the optical recording medium disk of the present invention, and Fig. 3 is a configuration of m pieces of the above-mentioned optical recording medium disk proposed by the applicant company. FIG. G...Tracking guide groove, 1...Transparent substrate,
2...Organic material recording film, 3...Metal film for light reflection,
4...Protective film, Go...pit, Ga...guide groove for tracking

Claims (1)

[Claims] In the transparent substrate where the pits in the ROM area and the guide groove for tracking in the RAM area are provided, a predetermined area is formed over the entire area of the ROM area and the RAM area on the side where the pits and the guide groove for tracking are provided. An organic material recording film whose refractive index changes by absorbing an appropriate amount of the laser light when it is irradiated with a recording laser light having a specific wavelength is deposited; In addition to providing a reflective metal film, the ROM area and RAM area
When the same recording information is recorded in both the ROM area and the RAM area, when the reproduction light of the same wavelength and the same light intensity is incident on the ROM area and the RAM area, the reflected light from the ROM area is The optical depth of the pit in the ROM area and the optical depth of the tracking guide groove in the RAM area are adjusted so that the state and the state of the reflected light from the RAM area are approximately the same. An optical recording medium disk with a defined