JPH11316979A - Optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical information recording medium which enables a user to visually confirm the below mentioned capacity information by easily and accurately displaying the capacity and time of the recorded area and the capacity and time of the free area (capacity information) without decreasing recordable capacity and without adding any additional constitution to itself. SOLUTION: This is represented by an optical information recording medium provided with a display area (9) for the capacity information which can be viewed from a light irradiation side at the part corresponding to the recording area (A) of a recording layer changing in optical characteristics by light irradiation. As its concrete style, graduations are formed by varying the groove width of a guide groove, providing a stuck layer additionally and varying its stress distribution, or using, on a substrate, ink which is visible without affecting recording light, reproduction light, and erasing light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium capable of recording, reproducing, and erasing information by irradiating light.

[0002]

2. Description of the Related Art Various optical disks have been proposed as optical information recording media capable of recording, reproducing, and erasing information by irradiating light with the recent arrival of a highly information-oriented society. Is actually being put on the market.

[0003] For example, as such an optical disc, a C-type recording medium using an organic dye material for a recording layer and capable of performing only one-time recording.
DR (Recordable Compact Di)
sk: recordable compact desk),
CD-E (Erasable Compa) capable of recording and erasing information a plurality of times using a phase-change material for the recording layer
ct Disk: rewritable compact disc) or D
VD-RAM (Rewritable Digital)
Versatile Disk: a rewritable digital versatile disk).

Here, in the CD-R, a part of the organic dye material of the recording layer is decomposed by light irradiation, and the substrate provided adjacent to the recording layer is softened by heating. The interface between the recording layer and the substrate is deformed to form recording pits.

In a CD-E or DVD-RAM, the irradiation of light causes a phase change of a phase change type material of a recording layer to form a recording pit.

Accordingly, in such an optical disc, a change in optical characteristics such as a change in reflectance occurs depending on whether or not a recording pit is formed. Regions that have not been identified can be identified.

In such an optical disc, as disclosed in JP-A-8-96555 and JP-A-8-96557, the information recording area is recorded in a portion other than the information recording area of the recording layer. There is also proposed a configuration in which a new area for recording the usage amount corresponding to the set area is provided, and the usage amount of the information recording area can be determined by visually checking the area.

As disclosed in Japanese Patent Application Laid-Open No. 9-274739, such an optical disc has also been proposed which is provided with a determination unit on the opposite side of the substrate from which the recording time up to that point can be determined. I have.

Further, if a scale or the like corresponding to the optical disk to be stored is attached to the cartridge for storing the optical disk in advance, similar identification by visual observation is possible.

[0010] Also, even when not directly observed,
By playing back with a general playback device, you can know the amount of information and time already recorded, and from the predetermined maximum recording capacity and recording time, you can record how much information and how much time in the future You can also know.

The information recording method is CAV.
(Constant AngularVelocit
y: Constant angular velocity method, CLV (Constant L)
Inner Velocity (constant linear velocity) method, MCLV (Modi) that changes linear velocity for each certain radius area
fied Constant Linear Velo
city: Modified linear velocity) method, and MCAV (Modified Cons) in which the linear velocity is kept constant and the transfer rate of recording information is changed for each radius area.
(Tent Angular Velocity: Modified constant angular velocity) method and the like.

[0012]

However, if the user tries to distinguish between a recorded area and a non-recorded area visually from the substrate side in accordance with the presence or absence of recording pits, the information is stored in a CLV system. MCLV system, MCAV
In an optical disc recorded by a method or the like, a radial end position (a boundary position between a portion where a recording pit is formed and a portion where a recording pit is not formed) at which a visible recording pit is formed, and There is no linear relationship between the amount of information and the recording time. Even if the user simply recognizes such a tip position, it is impossible to determine how much information has been recorded and how much information can be recorded in the future.

Further, an area usable for recording information is divided into an information recording area and a part other than the information recording area, and the amount of use corresponding to the recorded area of the information recording area is stored in a part other than the information recording area. In an optical disc provided with an area for recording,
The area available for recording information must be reduced.

On the other hand, an optical disc provided with a judging section on the side opposite to the substrate, which can judge the recording time up to that point, requires an additional judging section, and the configuration itself is complicated.

Further, if a scale or the like is provided on a cartridge of an optical disk, it is possible to quantitatively judge how much information can be recorded in the future, but it is assumed that a cartridge is used in the first place, and If the type of optical disc or the recording method is changed, the result is complicated, such as changing the scale of the cartridge or preparing another cartridge.

Also, at the time of reproduction by the reproducing apparatus, it is possible to detect how much information can be recorded in the future and display it to the user. However, the apparatus is started up each time and set in the apparatus each time. It requires time and effort, and it is still not a simple method.

According to the present invention, the recording can be performed without reducing the recordable capacity, without requiring any additional configuration itself, and without requiring external members and devices such as a cartridge and a reproducing apparatus. Capacity information such as the recorded capacity (corresponding to the capacity from the recording start position), the remaining recording capacity (corresponding to the capacity from the recording end position), the recorded time, the remaining recording time, etc. The main object of the present invention is to provide an optical information recording medium which can easily and accurately display the information and allows the user to visually check the capacity information.

[0018]

In order to solve the above-mentioned problems, a typical present invention relates to a method for recording substantially all of a recording layer in which optical characteristics such as a reflectance, a refractive index, and a transmittance change upon irradiation of light. The optical information recording medium has a configuration in which a capacity information display area is provided so that the capacity information can be viewed from the light irradiation side at a portion corresponding to the area.

As a result, the capacity information can be easily obtained without reducing the recordable capacity, without requiring any additional configuration itself, and without requiring external members such as a cartridge and a reproducing apparatus. In addition, the information can be displayed accurately, and the user can visually confirm the capacity information.

Further, specific embodiments of such a recording medium include changing the groove width of a guide groove, changing the stress distribution by additionally providing a bonding layer, or recording light on a substrate. (1) A scale for displaying capacity information, in a preferred example, a scale is formed by using ink that can be visually observed without affecting reproduction light and erasing light.

[0021] Such a recording medium is manufactured by using a master having a pattern in which the groove width is changed, or exposing the bonding layer using a mask having a pattern having a different transmittance to ultraviolet rays. It can be suitably manufactured by an apparatus or a manufacturing method.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to the first aspect of the present invention provides an optical system by irradiating recording light from the substrates 2, 22, 32 and the substrates 2, 22, 32 formed on the substrates 2, 22, 32. An optical information recording medium including a recording layer on which information is recorded in response to a change in characteristics, and recording of information on the recording layer from the irradiation side of the recording light. This is an optical information recording medium whose capacity is visible.

With such a configuration, the capacity information is displayed easily and accurately, and the capacity information is visually confirmed.

Specifically, as described in claim 2, guide grooves 3 and 23 are formed in the substrates 2 and 22, and the recording capacity is determined by using the change in the groove width of the guide grooves 3 and 23. A configuration that allows visual observation is given.

By the change of the width of the guide groove, a scale for displaying the capacity information is formed, the capacity information is easily and accurately displayed, and the capacity information is visually confirmed.

The recording medium on which the scale is formed by the change in the width of the guide groove is provided with a master disk manufacturing step of manufacturing a master disk 10 on which a groove pattern having a changed groove width is formed.
A substrate manufacturing process for manufacturing substrates 2 and 22 having guide grooves corresponding to the groove patterns using the master disk 10, and recording layers 4 and 2 on which information can be recorded by light on the substrates 2 and 22.
4 can be suitably manufactured by a manufacturing method including a recording layer forming step of forming a recording layer 4.

Further, the master includes a laser light source 12 and
A modulator 13 for modulating a laser beam emitted from a laser light source 12, an optical system 14, 15 for condensing the laser beam modulated by the modulator 13 on a master 10 coated with a photoresist, and A table 11 on which a master 10 can be placed so as to be relatively movable with respect to the laser light to be focused; and a modulator 13 modulates the laser light so that a groove pattern having a changed groove width is formed on the master 10. It can be suitably obtained by a master recording device.

As for the recording medium, specifically, as described in claim 3, an opposing member 37 positioned opposite to the substrate 32 with the recording layer 34 interposed therebetween is provided. And a structure in which the recording capacity is made visible by a strain 38 generated between the opposing member 37 and the recording layer 34 due to a stress generated when the opposing member 37 is bonded to the substrate 32 and the recording layer 34 side. No.

A scale is also formed by the uneven portion caused by the distortion, and the capacity information is displayed easily and accurately.
The capacity information is visually confirmed.

The recording medium in which the uneven portion is formed in the vicinity of the bonded portion corresponding to the stress distribution of the bonded layer as described above, and the uneven portion serves as a scale, comprises the steps of preparing a substrate 32, A recording layer forming step of forming a recording layer 34 on which information can be recorded by light on the substrate 32, and a facing member 37 positioned opposite to the substrate 32 on the opposite side of the substrate 32 with the recording layer 34 interposed therebetween. And a bonding step of bonding using the bonding layer 36. In the bonding step, the bonding layer 36 can be suitably manufactured by a manufacturing method that causes a stress distribution in the bonding layer 36.

In this bonding, the light source 44, the mask member 42 in which regions having different transmittances with respect to the light emitted from the light source 44 are formed, and the mask member 42 emitted from the light source 44 and transmitted through the mask member 42. A table 41 on which a first bonding member 40 on which an ultraviolet-curing resin layer which receives light and exhibits photosensitivity to the light is formed, a first bonding member 40 and the ultraviolet-curing resin layer And a press that applies pressure between the second bonding member and the opposing second bonding member so as to sandwich it.

Further, with respect to the recording medium, specifically, as described in claim 4, the recording capacity of the substrates 2 and 22 is made visible using ink transparent to light of a specific wavelength. Is displayed.

Here, the fact that the ink is transparent to light of a specific wavelength means that the operation of recording or the like is substantially affected by the wavelength of laser light or the like used in recording, reproduction, erasing, or the like. It is not. Further, the ink has a property of causing visible light or the like used for visual observation, such as reflection or scattering, and visible.

Therefore, a scale can also be formed by a printing unit using such ink, and the capacity information is displayed easily and accurately, and the capacity information can be confirmed visually.

Hereinafter, each embodiment of the present invention will be described in more detail with reference to the drawings.

(Embodiment 1) First, Embodiment 1 of the present invention will be described.

FIG. 1 is a schematic view of an optical disc 1 according to the present embodiment when viewed from the top, in which a guide groove 3 for tracking is formed on a circular substrate 2 which is a light incident surface from an inner side. It is provided spirally while gradually increasing the distance from the center toward the radial side.

Next, the structure of the optical disc 1 of the present embodiment will be described in more detail with reference to FIG.

FIG. 2A is a schematic cross-sectional view of the optical disk 1. The guide groove 3 provided on the substrate 2 is formed by using the uneven shape of the surface of the substrate 2. The recording layer 4 and the protective layer 5 are sequentially laminated on the substrate 2 on which is formed.

Here, as shown in FIG. 2B, the recording layer 4 is formed by sequentially forming a recording material layer 4a and a reflection layer 4b from the substrate 2 side.

Then, the laser beam 7 is irradiated on the recording layer 4 of the optical disk 1 by the optical pickup 6 while being tracked by the guide groove 3 to form recording pits, record information, and record the recorded information. Can also be reproduced.

That is, the optical disk 1 having the above-described configuration has a so-called CD-R configuration. In the present embodiment, the substrate 2 is made of polycarbonate, and the material of the recording material layer 4a is made of the wavelength of the recording light (preferably). Can be used as long as the material decomposes, deforms or sublimates with respect to a band of 600 to 900 nm).
1 ′, 3 ′, 3′-hexamethyl-2, 2′-indotricarbocyanine iodide, aluminum as the reflective layer 4b, and XR11 (Sumitomo Chemical Co., Ltd.) which is an acrylate-based ultraviolet curable resin as the protective layer 5 (Made by Corporation)
Was used for each.

The recording material layer 4a is formed by dissolving the recording material in an alcohol-based solvent and spin-coating the recording material layer 4a.
b was formed by a vacuum evaporation method, and the protective layer 5 was formed by a spin coating method.

Further, in the present embodiment, FIG.
The groove width of the guide groove 3 is changed, as shown in (a), its cross-sectional shape, and in FIG. 3 (b), its shape when observed from the substrate side. Here, the groove width refers to a width in a direction orthogonal to the direction in which the guide groove 3 extends in a spiral shape.

As can be understood with reference to FIG. 3B, by changing the groove width of the guide groove 3, a numeral constituting a part of a scale for quantitatively indicating capacity information is formed. 3 (b), the numeral "5" can be read as an example. FIG. 3 (b)
In FIG. 1, spiral guide grooves that are originally adjacent to each other are simplified in a straight line.

FIG. 3B shows an example in which seven groove widths are changed for the sake of explanation.
6 (μm), the character size is actually 3 (m).
m) In order to make the angle, it is necessary to change the width of about 1870 grooves.

However, a change in the groove width can be sufficiently recognized by changing the groove width by 2 to 3 (%). On the other hand, when the change in the groove width exceeds 10 (%), the recording and reproducing characteristics deteriorate. Therefore, it is preferable to change the groove width in such a range.

Here, although the example is shown in which the groove width is increased, characters may be expressed by reducing the groove width.

As described above, by changing the groove width of the guide groove 3,
FIG. 4 shows an example in which a scale for quantitatively indicating the capacity information is specifically formed.

FIG. 4 is a diagram in which the optical disc 1 of the present embodiment is observed from the substrate side.

In FIG. 4, the width of the guide groove is changed in accordance with the method described with reference to FIG. 3, and a scale 9 consisting of a numeral and a line is formed. The scale 9 on the upper side of the drawing corresponds to the recorded capacity when recording is performed from the inner diameter side to the outer diameter side of the optical disc 1, or the remaining recording capacity when recording is performed from the outer diameter side to the inner diameter side. On the other hand, the scale 9 on the lower side of the drawing indicates the recorded capacity when recording is performed from the outer diameter side to the inner diameter side of the optical disc 1, or the remaining recording when the recording is performed from the inner diameter side to the outer diameter side. Corresponds to capacity. In FIG. 4, a double-headed arrow A indicates the entire recording area where information can be recorded.

That is, in the present embodiment, the scale 9 in FIG. 4 indicates that the recording condition is CLV rotation and the recording speed is 1.2.
(M / s), track pitch 1.6 (μm), transfer rate 1.41 (Mbps), innermost recording radius 25 (m)
m) and the innermost radius 58.5 (mm), so assuming a case where recording is performed from the position of 25 (mm) on the innermost radial side, 100 (MB) is 31.2 (mm), 200 (M
B) 36.3 (mm), 300 (MB) 40.8
(Mm), 400 (MB) to 44.9 (mm), 500
(MB) is 48.6 (mm) and 600 (MB) is 52.
0 (mm), 700 (MB) at 55.2 (mm), and 800 (MB) at 58.3 (mm).

In addition, 58.5 (mm) on the outermost radius side
Assuming the case where recording is performed from the position of 100 MB, 55.5 (mm) for 100 (MB) and 52.2 (m) for 200 (MB).
m), 300 (MB) to 48.8 (mm), 400 (M
B) 45.1 (mm), 500 (MB) 41.1
(Mm), 600 (MB) to 36.6 (mm), 700
(MB) is 31.5 (mm) and 800 (MB) is 2
Also described at the position of 5.5 (mm).

When the recording time is to be used as a scale, under the same conditions, when recording from a position of 25 (mm) on the innermost radial side, 10 (minutes) is converted to 31.5 (m).
m), 20 (min) is 36.9 (mm), 30 (min) is 4
1.5 (mm), 40 (min) to 45.8 (min), 50
(Min) is 49.6 (mm) and 60 (min) is 53.2 (m).
m) and 70 (minute) may be described at the position of 56.5 (mm).

In this case, in addition, 5 on the outermost radius side is used.
Assuming that recording is performed from a position of 8.5 (mm),
0 (min) is 55.2 (mm) and 20 (min) is 51.9.
(Mm), 30 (min) to 48.2 (mm), 40 (min)
Is 44.2 (mm), 50 (min) is 39.9 (mm),
60 (min) is 35.0 (mm), and 70 (min) is 2
What is necessary is just to also describe each at the position of 9.2 (mm).

After starting the recording of the optical disk 1 from the inner diameter side and stopping the recording on the way, the optical desk 1 was visually observed from the substrate side under visible light, and as shown in FIG.
The recorded area 8a on which recording has already been performed and the unrecorded area 8b on which recording has not yet been performed are partially decomposed while the dye of the recording material layer 4a in the recorded area 8a is heated and melted by light irradiation, and simultaneously heated. By interacting with the softened substrate 2, a deformed portion is formed at the interface between the substrate 2 and the recording layer 4, and a recording pit is formed. The scale 9 formed by changing the groove width of the guide groove 3 which can be identified can also be clearly read, and as a whole, the amount of information recorded so far and the amount of information that can be recorded can be quantitatively and accurately recognized. did it.

Next, a specific method for changing the groove width of the guide groove 3 in the present embodiment will be described.

FIG. 5 shows the configuration of a master recording apparatus used to manufacture the substrate 2 in which the width of the guide groove 3 in this embodiment is changed.

In FIG. 5, a soda-lime glass substrate 10 coated with a photoresist having a trade name of TSMR-V3 (manufactured by Tokyo Ohka Co., Ltd.) is placed on a table 11 with the photoresist side facing upward. Have been. The table 11 is rotatable about a rotation shaft 11a, and is also movable in a horizontal direction as indicated by an arrow B.

The glass substrate 10 thus set is irradiated with laser light for photoresist exposure. This laser light is emitted from an argon laser light source 12 having an oscillation wavelength of 413 (nm), and then enters a modulator 13 and undergoes predetermined light intensity modulation. After being emitted from the modulator 13, a reflection mirror 14 and a condenser lens 15 are emitted. Through the glass substrate 10
Is condensed and irradiated.

Here, a data signal including information for forming a groove width of the guide groove corresponding to the scale to be formed is input to the modulator 13 from a data signal supplier (not shown). The amount of light is adjusted by modulating the laser light in accordance with the data signal. As a result, the photoresist on the glass substrate 10 rotates the table 11 in the X direction and moves in the B direction by the modulated laser light. It will be exposed in a spiral.

Therefore, the photoresist on the glass substrate 10 has a guide groove 3 having a groove width change to be finally formed.
Is exposed to a pattern corresponding to.

Then, the glass substrate 10 exposed as described above is developed, a pattern corresponding to the guide groove 3 is formed on the glass substrate 10, and a conductive thin film is formed on the glass substrate 10 on which the pattern is formed. Is formed by a sputtering method, a nickel metal layer is formed thereon by electroforming, then separated and separated from each other, and a so-called stamper is manufactured using the metal layer side. When the metal layer side is used as a master (called a master when a plurality of stampers are manufactured), a metal layer is formed on the master and separated from each other, and this is repeated to obtain a plurality of stampers. Will be.

When the substrate material is molded using the stamper thus formed, the substrate 2 on which the guide groove 3 having a change in the groove width to be formed is obtained.

The above conductive thin film may be formed by electroless plating, and the metal layer is not limited to nickel.

In this embodiment, it is also possible to form a scale corresponding to the capacity information by changing the groove width of the guide groove on the optical disk 21 whose sectional shape is shown in FIG.

As shown in FIG. 6A, such an optical disk 21 has a guide groove 23 provided on a substrate 22, and a recording layer 24 and a protective layer 25 are sequentially formed on the substrate 22. As shown in FIG. 6B, the recording layer 24 is formed by sequentially laminating a dielectric layer 24a, a recording material layer 24b, a dielectric layer 24c, and a reflective layer 24d from the substrate 22 side. And CD-E and DVD-RAM
Corresponding to In FIG. 6A, the recording layer 24
The shape of the end face on the protective layer 25 side is simplified in plan view.

Here, as the dielectric layers 24a and 24c, a ZnS—SiO ₂ layer is formed by a sputtering method, as the recording material layer 24b, a TeGeSb layer is formed by a sputtering method, and as the reflection layer 24d, An aluminum layer was formed by a sputtering method.

The substrate 22 and the protective layer 25 are formed as shown in FIG.
The optical disk 1 is the same as that of the optical disk 1 described above, and the scale is similarly provided by changing the groove width of the guide groove 23.

The recording of the optical disk 21 was started from the inner diameter side, and the recording was stopped halfway, and then visually observed from the substrate side under visible light. As shown in FIG. The recorded area 8a on which recording has already been performed and the unrecorded area 8b on which recording has not yet been performed are the recorded area 8a.
The recording material layer 4a is changed in phase by light irradiation to form recording pits having different reflectivities. Therefore, a difference occurs in the diffraction characteristics of light, so that the recording pits can be clearly identified and the groove width of the guide groove 3 is reduced. The scale 9 formed by the change was clearly read, and as a whole, the amount of information recorded so far and the amount of information that can be recorded from now on could be quantitatively and accurately recognized.

The materials and the like described in the present embodiment are merely examples. For example, in addition to the materials described above, the material of the substrate may be transparent to recording light such as PMMA (polymethyl methacrylate), polyolefin, or epoxy. Material is available.

The dye-based recording materials other than those described above include 1,3,3,1 ′, 3 ′, 3′-hexamethyl-
Cyanine dyes such as 2,2 ′-(4,5,4 ′, 5′-dibenzo) indodicarbocyanine perchlorate;
4,8,12,16-tetrabromo-1,5,9,13
Phthalocyanine dyes such as tetra (1,3-dimethylbutyloxy) phthalocyanine palladium, naphthoquinone dyes, and squarylium dyes can be used.

Further, regarding the recording layer of the dye-based recording material,
In the case of the spin coating method, in addition to the above, ketone alcohol-based and ketone-based solvents can be used as the solvent. Further, a vacuum deposition method can be used instead of the spin coating method.

As a phase change type recording material, AgIn
SbTe can also be used, and may be formed by a vacuum deposition method.

Further, the dielectric layer may be formed by a vacuum evaporation method.

As the reflection layer, gold can also be used, and it can be formed by a vacuum deposition method instead of the sputtering method. However, when the sputtering method is used, it is dense, has excellent adhesion, and has excellent heat diffusion properties.

As the protective layer, SD17 (trade name, manufactured by Dainippon Ink and Chemicals, Inc.) can be used as another acrylate-based ultraviolet curable resin, and an epoxy-based thermosetting resin may be used.

(Embodiment 2) This embodiment is different from the first embodiment in the method of forming the scale 9 and the details of the configuration of the scale 9 formed. Is substantially the same as

FIG. 7 is a schematic sectional view of an optical disk 31 according to the present embodiment. A guide groove 33 provided on a substrate 32 which is a light incident surface is formed by utilizing the unevenness of the surface of the substrate 32. The recording layer 34 is formed on the substrate 32 on which the guide groove 33 is formed.

Here, the recording layer 34 in the present embodiment
As described with reference to FIG. 6 in the first embodiment, a layer formed by sequentially laminating a dielectric layer, a recording material layer, a dielectric layer, and a reflective layer from the substrate 32 side was used.

Further, a protective layer 35 is formed on the recording layer 32, and a reinforcing plate 37 is provided on the constituent member on which the substrate 32, the recording layer 34 and the protective layer 35 are formed via a bonding layer 36. Laminated. The reinforcing plate 37 is added to increase the strength of the component.

Next, a method of bonding the reinforcing plate 37 via the bonding layer 36 in the present embodiment will be described.

FIG. 8 is a schematic sectional view of a laminating apparatus used to generate a stress distribution in the laminating layer 36 during lamination.

In FIG. 8, a disk 40 having an ultraviolet-curable resin layer having a slow-acting ultraviolet-curable resin applied on its surface is shown.
Are placed on a table 41 movable in the direction of arrow C.

This disc 40 is an optical disc 31 in which a recording layer 34 and a protective layer 35 are sequentially formed on a substrate 32.
This corresponds to a component portion on which an ultraviolet curable resin layer serving as a bonding layer 36 is applied.

[0086] Above the disk 40, a mask 42 on which a pattern having a different ultraviolet transmittance corresponding to the stress distribution to be generated is formed is placed on a tray 43.

The mask 42 has a thickness of 2 mm as an example.
In this case, patterns having different ultraviolet transmittances corresponding to the stress distribution to be generated by black, blue, yellow, etc. inks are formed on the quartz glass.

On the other hand, an ultraviolet lamp 44 is provided above the disk 40 and the mask 42, and a shutter 45 and a heat ray cut filter 46 are provided between the mask 42 and the ultraviolet lamp 44. Are located in

Further, an exhaust fan 48 is provided in the housing 47.
Is provided, and the inside of the housing 47 is exhausted as necessary via the exhaust duct 49.

In the above configuration, the mask 42 on which a pattern having a different ultraviolet transmittance corresponding to the stress distribution to be generated in the bonding layer 36 is formed from the ultraviolet lamp 44.
Is irradiated with ultraviolet rays.

Here, the mask 42 has been moved in the direction D from the outside, and the disk 40 has been moved in the direction C from the outside, and the placement at the appropriate irradiation position has been completed.

The irradiation is started by opening the shutter 45, and the ultraviolet rays enter the mask 42 after unnecessary heat rays are cut off by the heat ray cut filter 46.

Then, when the ultraviolet rays pass through the mask 42, the ultraviolet rays become light having an intensity distribution corresponding to the pattern of the ultraviolet ray transmittance given in advance, and the light is transmitted through the opening 43a of the tray.
Through the UV-curable resin layer of the disk 40.

Then, after irradiating the ultraviolet curable resin layer of the disk 40 with ultraviolet rays, the disk 40 is moved in the direction C and placed at the operating position of a press (not shown), and The reinforcing plate 37 is disposed to face, and a press is operated to apply a pressure between the disk 40 and the reinforcing plate 37, and the two are bonded to complete the optical disk 31.

The optical disk 31 thus bonded is:
As time passes, as the bonding layer 36 cures in accordance with the amount of light irradiated through the mask 42, a stress distribution corresponding to a scale for quantitatively displaying capacitance information is generated, and a corresponding protective layer is formed. In the reflection layer 35 and the recording material layer of the recording layer 34, distortion 38 occurs in a portion schematically indicated by reference numeral 38 in FIG. Is formed for quantitatively displaying the scale. In FIG. 7,
The distortion 38 is shown only at one location for convenience, but of course, specifically, it occurs at a location corresponding to the scale 9.

When recording on the optical disk 31 was started from the inner diameter side, and recording was stopped halfway, the visible light was visually observed from the lower substrate side. As shown in FIG. The recorded area 8a in which recording has been performed and the unrecorded area 8b in which recording has not yet been performed are the recorded area 8a.
Phase of the recording material layer 4a is changed by irradiation of light, and recording pits having different reflectivities are formed. Therefore, a difference occurs in the diffraction characteristic of light, and the recording pit can be clearly identified. The graduations 9 formed by the formation of the concave and convex portions were clearly read, and as a whole, the amount of information recorded up to now and the amount of information that can be recorded can be quantitatively and accurately recognized.

In this embodiment, the case where the reinforcing plate is added to the optical disk corresponding to FIG. 6 has been described. However, it is needless to say that the reinforcing plate can be added to the optical disk shown in FIG. The same effect can be obtained even when the optical disks shown in FIGS. 2 and 6 are pasted together.

(Embodiment 3) The configuration for quantitatively displaying the capacity information by using the internal structure of the optical disk has been described above. However, the recording light and the reproduction light are provided on the substrate which is the light incident surface. Although it is transparent to light used for erasing light, etc., it is also possible to print graduations using ink that reflects or scatters visible light, that is, visible light,
Similar effects can be obtained.

In the present embodiment, the optical disk 1 described with reference to FIG. 2 is used, and the substrate 2 is transparent to the light to be used, such as recording light and reproduction light. After directly printing the same scale as that formed in the first embodiment by using the scattered ink, the recording of the optical disk 1 is started from the inner diameter side, the recording is stopped halfway, and the recording is performed under visible light. And was visually observed from the substrate side.

As a result, as shown in FIG. 4, the recorded area 8a on which recording has already been performed and the unrecorded area 8b on which recording has not yet been performed are the same as those of the recording material layer 4a of the recorded area 8a. The dye is partially decomposed while being heated and melted by light irradiation, and interacts with the heated and softened substrate 2 to form a deformed portion at the interface between the substrate 2 and the recording layer 4, thereby forming a recording pit. Therefore, there is a difference in the diffraction characteristics of light, which can be clearly identified, and the scale 9 directly printed on the substrate can be clearly read, and as a whole, the amount of information recorded so far and the amount of information that can be recorded from now on However, it could be quantitatively and accurately recognized.

Although the present embodiment has been described with reference to the optical disk shown in FIG. 2, it is needless to say that the present invention can be similarly applied to the optical disk shown in FIG.

[0102]

As described above, according to the present invention, this light is applied to a portion corresponding to the entire recording area of the recording layer where the optical characteristics such as the reflectance, the refractive index, and the transmittance change by light irradiation. Thus, an optical information recording medium having a configuration in which a capacity information display area is provided so that the capacity information can be seen from the irradiation side is realized.

As a result, the capacity information can be easily stored without reducing the recordable capacity, without requiring any additional configuration itself, and without requiring external members such as a cartridge and a reproducing apparatus. In addition, it is possible to display the information accurately, and it is possible to visually check the capacity information by the user, and the utility value is high.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an optical information recording medium according to a first embodiment of the present invention.

FIG. 2A shows a schematic cross section of an optical information recording medium according to the first embodiment of the present invention. FIG. 2B is an enlarged view showing a recording layer of the optical information recording medium according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a change in groove width of a guide groove of the optical information recording medium according to the first embodiment of the present invention.

FIG. 4 is a top view of the optical information recording medium according to Embodiment 1 of the present invention in a state where the scale is provided;

FIG. 5 is a schematic configuration diagram of an optical information recording medium master recording apparatus according to Embodiment 1 of the present invention.

FIG. 6A is a diagram showing a schematic cross section of another optical information recording medium according to the first embodiment of the present invention. FIG. 3B is an enlarged view showing a recording layer of another optical information recording medium according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a schematic cross section of an optical information recording medium according to a second embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of an apparatus for manufacturing a disk used for an optical information recording medium according to Embodiment 2 of the present invention.

[Description of Signs] 1, 21, 31 Optical disk 2, 22, 32 Substrate 3, 23, 33 Guide groove 4, 24, 34 Recording layer 5, 25, 35 Protective layer 6 Optical pickup 7 Laser beam 8a Recorded area 8b Not yet Recording area 9 Scale 10 Glass substrate 11 Table 12 Laser light source 13 Modulator 14 Mirror 15 Condensing lens 36 Lamination layer 37 Reinforcement plate 38 Strain 40 Disk 41 Table 42 Mask 43 Tray 44 Ultraviolet lamp 45 Shutter 46 Heat ray cut filter 47 Housing 48 Exhaust fan 49 Exhaust duct

Claims (4)

[Claims] An optical information recording medium comprising: a substrate; and a recording layer formed on the substrate and recording information in response to a change in optical characteristics due to irradiation of recording light from the substrate side. An optical information recording medium, wherein a recording capacity of information in the recording layer can be viewed from the irradiation side of the recording light. 2. The optical information recording medium according to claim 1, wherein a guide groove is formed in the substrate, and the recording capacity is made visible by using a change in a groove width of the guide groove. 3. An apparatus according to claim 1, further comprising an opposing member positioned on an opposite side of said substrate via said recording layer so as to oppose said substrate, said opposing member being bonded to said substrate and said recording layer side. 2. The optical information recording medium according to claim 1, wherein the recording capacity is made visible by strain generated between the facing member and the recording layer due to stress. 4. The optical information recording medium according to claim 1, wherein the recording capacity is visually displayed on the substrate by using an ink transparent to light of a specific wavelength.