JP4158093B2 - Optical information recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical information recording medium that is optically recordable / reproducible, and that prevents a printed image from seeing a boundary due to light reflection.
[0002]
[Prior art]
Currently, CD (Compact Disc) is most commonly known as an optical information recording medium as a means for recording and reproducing data such as images such as characters and graphics, video or audio, and the like. The use of a DVD (Digital Versatile Disc) that enables high-density recording / reproduction is promoted.
With the recent development of short-wavelength lasers, the practical use of DVDs has progressed and the standards have been standardized. However, compared to CD standards, there are different standards for higher recording density. Determined. For example, in an optical pickup, a short wavelength red laser having a wavelength of 630 to 670 nm is used, and a high aperture ratio objective lens having an aperture ratio NA of 0.6 is used.
With the establishment of the DVD standard, when recording and reproduction are performed, the disk is easily warped by laser irradiation. Therefore, in order to suppress the warp, the thickness is about half that of a CD having a thickness of 0.6 mm. Discs of thickness are adopted. Actually, in order to be able to use the CD equipment for DVD, the two discs are bonded together and the dimensions are matched with the CD disc of 1.2 mm thickness so as to be compatible. Yes. The DVD standard stipulates that, with a DVD having such a structure, a maximum recording capacity of about 4.7 GB and a video and audio average of about 133 minutes are recorded on a single disc as a standard.
These write-once optical information recording media such as CD-R and DVD-R have a hole-forming optical disc that records an organic dye such as cyanine as a recording layer and forms holes by irradiating light. In particular, cyanine dyes are excellent in that a highly productive method such as a spin coating method can be applied, excellent in oxidation resistance, and can be locally heated because of low thermal conductivity. It is attracting attention because of its high absorptivity and reflectivity in the laser wavelength range.
[0003]
Conventionally, in a recordable CD such as a CD-R or CD-RW, a hydrophilic resin film is formed on the surface (label surface) opposite to the side on which the recording light and reproduction light are incident on the translucent substrate. An optical disc has been developed in which a printable surface, i.e., a printable layer is formed, aqueous ink is printed by a bubble jet (registered trademark) printer or the like, and the ink film can be fixed (for example, Japanese Patent Laid-Open No. Hei 8- No. 102088). As for DVDs, DVDs that can be recorded by printing or the like, that is, DVD-Rs, DVD-RWs, and the like have been developed, and optical discs having a printable layer as described above have also been developed.
In such an optical disk, a pregroove as a tracking guide is formed on one main surface of a transparent substrate injection-molded using a resin such as polycarbonate or polymethyl methacrylate, and a cyanine dye is formed on the surface on which the pregroove is formed. And a reflective layer made of a metal film such as gold, silver or aluminum, and a protective layer made of an ultraviolet curable resin on the reflective layer. A type in which a hydrophilic UV curable resin film is provided on the substrate and used as a printable layer, and another substrate is laminated on the reflective layer via an adhesive layer, and a printable layer is provided thereon. The former is used for CD-R and the latter is used for DVD-R.
[0004]
By the way, in the CD and DVD discs described above, the substrate is obtained by injection molding a polycarbonate resin or the like using a stamper, and the structure is a fixed area away from the center hole, and the outer peripheral part is a clamping area. A pregroove as a tracking guide is formed on the surface of the substrate, and the dye layer, the reflective layer, the protective layer, and the printable layer are sequentially formed on the surface of the substrate on which the pregroove is formed, or the reflective layer is formed. Further, another substrate is pasted on the adhesive via an adhesive, but the CD or DVD is mounted on the drive in the above-mentioned clamping area or the clamping area of the corresponding portion of the pasted other substrate. This is a necessary part for chucking (mechanism for holding CDs and DVDs), and usually a recording error for forming a recording layer. Not used as A (recording area). According to the standard, the clamping area is 26 mm to 33 mm for the CD-R and 22 mm to 33 mm for the CD-R from the center hole, and even a RW disc can be applied if there is a tracking guide pregroup. In these cases, a stamper groove formed by the above stamper molding (groove by stamper pressing) is formed on the outer end side of the clamping area of the substrate on which the recording layer is formed. A recording area in which a recording layer is formed on the outer side of the clamping area is provided at a position corresponding to a partial contact ridge ring provided to prevent the incident surface from contacting and scratching the entire surface. There are many things.
[0005]
However, the stamper groove is moved to the inner end side of the clamping area, and the portion of the area corresponding to the stamper groove is also clamped on the label surface (the surface corresponding to that of another substrate to be bonded in the case of a bonded type). A so-called picture-type disc has been put into practical use, which has a shape that can be printed on the inner circumference side in the clamping area. According to the standard, this disc has a pre-group for tracking guides and Land pits for indicating address information and the like between the pregrooves are provided in a recording area outside the vicinity of a diameter of 43 mm. In such a case, the label surface corresponding to the enlarged clamping area is provided with a printable layer in the same manner as the label surface corresponding to the recording area, printing is performed on the label surface, and the printable range is enlarged and displayed. The range of goods can be expanded and the product value can be increased.
[0006]
However, conventionally, in such a picture type disc, a printable layer is provided on the label surface corresponding to the clamping area in the same manner as the label surface corresponding to the recording area, and printing is performed only on the printable layer. Absent.
[0007]
[Problems to be solved by the invention]
As described above, in the recording area, a recording layer containing an organic dye is formed on the surface of the substrate on which the pregroove is formed, and further, a reflective layer, a protective layer, and a printable layer are sequentially formed. If only printable layers are provided, when printing is performed on these printable layers, the light reflection differs, so that the pre-groove and the address information between the pre-grooves are indicated for the printed image. The image formed on the printable layer corresponding to the part of the land pit and the image formed on the printable layer in the clamping area have different visual appearances, and the image appears to have a boundary, which makes it easy to reduce the commercial value. There's a problem.
SUMMARY OF THE INVENTION An object of the present invention is to provide an optical information recording medium having a structure capable of forming an image such that a boundary is not recognized by reflection of light in an area expanded from a recording area to a clamping area.
[0008]
[Means for Solving the Problems]
As a result of diligent research to solve the above-mentioned problems, the inventors have extended the tracking guide pre-groove in the clamping area to provide a dummy groove and form a reflective layer. In particular, when a printable layer (image forming layer) is formed on the reflective layer even in the latter case alone, a printable layer (image forming layer) provided on a predetermined layer in the recording area Even when an image is formed on these, it has been found that the boundary cannot be recognized by visual appearance, and the present invention has been achieved.
Therefore, in order to solve the above problems, the present invention provides (1) an information recording area composed of a pregroove formed on a substrate, a recording layer, and a reflective layer, and a position corresponding to the information recording area. And the image forming layer provided over the clamping area located on the inner circumference side of the optical information recording medium, the reflective layer extends beyond the information recording area to the clamping area. is, and in which the second pre-groove with the reflective layer to provide an optical information recording medium, characterized in that it is extended to the clamping area.
In addition, the present invention provides ( 2 ) an outer periphery of the translucent substrate having a center hole and having a tracking groove guide pregroove formed with a constant region from the inside toward the outside. The recording layer having at least information recorded or the recording layer and the reflective layer are sequentially provided on the side, and at least the image forming layer is provided directly on the uppermost layer or through another translucent substrate. In the optical information recording medium in which the other main surface side of the optical substrate is the side on which at least the reproduction light is incident among the recording light and the reproduction light, the certain region or the other light-transmissive substrate corresponding to the certain region A certain area on the surface of the transparent substrate is used as a clamping area, and at least the reflective layer and the image-forming layer are provided in the clamping area of the one light-transmitting substrate, or in the clamping area of the one light-transmitting substrate. Also at least above The morphism layer provided and the other set at least the coating image layer in the clamping area of the transparent substrate only, and similar grooves and pregroove for tracking formic guide the clamping area of one of the light-transmissive substrate wherein When the other light-transmitting substrate is used, the dummy groove may or may not be formed on the surface of the one light-transmitting substrate facing the clamping area. the optical information recording medium you wherein, (3), the recording layer is to provide an optical information recording medium of the above (1) or (2), characterized by containing the organic dye.
" (1), an information recording area composed of a pregroove formed on the substrate, a recording layer, and a reflective layer, and a clamping located on the inner circumference side from a position corresponding to the information recording area" An optical information recording medium comprising an image forming layer provided over an area, wherein the reflective layer extends beyond the information recording area to the clamping area A medium is provided.
The present invention also provides (2) an optical information recording medium, wherein the second pregroove is extended to the clamping area together with the reflective layer, (3) a tracking guide having a center hole A recording layer and a reflective layer on which at least information is recorded or sequentially recorded at least on the outer peripheral side leaving a certain region from the inside to the outside on one main surface side of the translucent substrate on which the pre-groove is formed And having at least an image forming layer directly on the uppermost layer or via another light-transmitting substrate, and the other main surface side of the one light-transmitting substrate has at least reproduction of recording light and reproduction light. In the optical information recording medium on the light incident side, the constant area or a constant area on the surface of the other translucent substrate corresponding to the constant area is used as a clamping area, and the one transparent substrate Less clamping area At least the reflective layer and the image forming layer are provided, or at least the reflective layer is provided also in the clamping area of the one light transmitting substrate, and at least the clamping area of the other light transmitting substrate is also provided. An optical information recording medium provided with a covering image layer, (4), wherein a dummy groove which is a groove similar to a tracking groove guide pregroove is formed in a clamping area of one translucent substrate, When the transparent substrate is used, the dummy groove may or may not be formed on the surface of the one transparent substrate facing the clamping area. An optical information recording medium, (5) and the optical information recording medium according to any one of (1) to (4) above, wherein the recording layer contains an organic dye. It can also be said.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
As an example of the optical information recording medium according to the present invention, FIGS. 1 and 2 show the case of a write once optical disc having a single-sided recording / reproducing structure by double-sided bonding, and a write-once optical disc having a single-sided recording / reproducing structure without bonding on one side. This case will be described with reference to FIG.
1 to 3, reference numeral 1 denotes a first substrate having a center hole 4 in the center of a translucent disc, and a stamper groove on the outer peripheral side in the vicinity of the center hole 4 on one main surface thereof. 4a (described above), and the other main surface has a stack ring 1a (described above), and is generally made by injection molding a transparent resin such as polycarbonate or polymethyl methacrylate.
A clamping area a is set on the outer peripheral side of the center hole 4 on one surface of the first substrate 1 having translucency, and the outer peripheral side of the clamping area is a data recording area (recording area or information recording). Region) b. A tracking guide pre-groove 3 made of a spiral groove is formed in the data recording area b, and the pitch is 0.74 μm as a standard, but the clamping area a has the same shape. The dummy groove 3a is formed.
Although not shown in the lands 8 (FIG. 2) between the tracking guide pregrooves 3, concave land pits for indicating address information and the like are recorded at appropriate intervals when signals are recorded on the optical disk. Is formed. This land pit is formed simultaneously with the pre-groove 3 and the dummy groove 3a when the first substrate 1 is manufactured by injection molding.
[0010]
On the main surface of the first substrate 1 on which the tracking guide pregroove 3 and the like are formed, most of the data recording area b and the inner end side of the clamping area a are left, for example, by spin coating or the like. The recording layer 12 is formed by applying an organic dye or the like by means. Next, the recording layer 12 is made of a metal film such as gold, aluminum, silver, copper or palladium, an alloy film thereof, or an alloy film obtained by adding a trace component to these metals by means such as sputtering or vacuum deposition. A reflective layer 13 is formed. In the clamping area a, the recording layer 12 may not be formed, but only the reflective layer 13 may be formed. Further, a resin film made of a resin liquid mainly composed of an ultraviolet curable resin may be formed on the reflective layer 13 by means such as screen printing or spin coating, and this may be ultraviolet cured to form a protective film. In FIG. 3, this protective layer 14 is formed, whereby an optical disk of a type in which no other substrate is bonded is obtained.
1 and 2, reference numeral 5 denotes a second substrate, which has a center hole 4 in the center formed in the same material, shape and dimensions as the first substrate, and a center hole on one main surface thereof. 4 is a transparent disk having a stamper groove 4a on the outer peripheral side, but differs from the first substrate in that the main surface is not subjected to any processing such as a tracking guide. As in the case of the first substrate 1, it is also preferable to provide a dummy groove in the clamping area.
[0011]
Next, the processed main surface side of the first substrate 1 and one main surface side of the second substrate 5 are bonded with an adhesive mainly composed of a reactive curable resin, for example, After coating by means such as spin coating or screen printing, the layers are superposed and the reactive curable resin is cured. As a result, the reflective layer 13 formed on the first substrate 1 and the second substrate 5 are joined by the adhesive layer 11, and an optical disc in which the two substrates are bonded together is obtained.
As shown in FIG. 2, this optical disc records information by entering laser light through a lens O from the main surface of the first substrate 1 that is not bonded, that is, the exposed side. In this type, the recorded information can be reproduced by entering a laser beam on one side and can be recorded / reproduced only on one side. The second substrate 5 may be one that does not have translucency or one that is colored to maintain light resistance.
Note that recording and reproduction are performed in the same manner on the optical disc of the type in which the other substrate shown in FIG. 3 is not bonded.
[0012]
3 thus obtained and on the exposed main surface side of the second substrate 5 of the optical disk of FIG. 1, that is, the data recording area b and the clamping area a. An ultraviolet curable type obtained by mixing, for example, an ultraviolet curable resin, another binder component, a viscosity modifier, a pigment, and other components on or directly provided with a base layer 15a in a corresponding region. Ink (containing pigment of 1 to 35%, preferably 5 to 25% in solid content on a weight basis) is printed by screen printing or spin coating, and then cured by irradiation with ultraviolet rays to form an image. Layer 15 is formed.
Examples of the pigment include organic and inorganic coloring pigments, inorganic fillers such as silica, alumina, wollastonite, aluminum hydroxide, and clay, or organic fillers such as acrylic beads, nylon beads, and rubber fine particles. These may be used alone or in combination.
When 1 to 35% of pigment is contained in the cured film of the ultraviolet curable ink, the pigment particles exposed on the surface are sufficiently fixed, giving the surface an appropriate roughness, and reducing the surface area. In addition to being able to increase, the adhesion of the colored toner on the printer ribbon can be increased, and the printability and resolution of the transferred image can be improved.
[0013]
The first substrate 1 as well as the protective layer formed thereon via the recording layer 12 and the reflective layer 13, the adhesive layer 11 on the protective layer or the reflective layer 13 and the second substrate 5 are , At least one of them may be opaque, but any of them may be transparent. In the transparent case, when the image forming layer 15 is not opaque, the metallic luster of the reflective layer 13 made of a metal film appears. Therefore, when the image forming layer 15 is printed, the image is formed. It may be difficult to accurately represent the colors of In that case, it is preferable that the base layer 15a is provided in an appropriate color, the image forming layer 15 is formed through the base layer, and the metallic luster of the reflective layer 13 is concealed by the base layer. . For example, when the base layer is milky white, the background color of the image forming layer 15 is the same white as paper. This underlayer is formed by printing an ultraviolet curable ink containing an ultraviolet curable resin and a pigment by a screen printing method or a spin coating method, and curing the printed film with an ultraviolet ray. In this case, the pigment content may be added as much as necessary to conceal the metallic luster of the reflective layer 13, and may exceed 35% of the solid content on a weight basis. In the case of printing directly on this underlayer due to too much pigment, even if the printability and resolution are poor, these performances can be improved by the image forming layer provided on the underlayer, so that the underlayer is the reflective layer 13. The composition can be determined only for the purpose of hiding the metallic luster.
[0014]
On the surface of the image forming layer 15 formed with or without the underlying layer in this way, not only the portion corresponding to the data recording area b but also the portion corresponding to the clamping area a has characters and designs. In the case of printing, printing by an inkjet printer or screen printing may be used, but printing via a printer ribbon by a thermal transfer printer is also preferably used. It is well known that printing by a thermal transfer printer is performed by printing with a printer attached to a personal computer or the like. Printing can be repeated on the surface of the image forming layer 15. This method can print a specific character or design on a necessary number of optical disks, and is optimal for printing on a relatively small number of optical disks.
Even if the image formed on the image forming layer 15 is only provided with a reflection layer in the clamping area a, the reflection layer does not transmit light, so that the light reflection from the recording area with the pregroove is uniform. However, if the dummy groove similar to the pregroove is further provided in the clamping area a, even if there is transmitted light, the reflected light is traced along the shape of the dummy groove. Since it is viewed through the reflective layer, it can be similar to the same phenomenon in the recording area, and as a result, the wavy shape visually observed can be made uniform in the radial direction, and the appearance can be made uniform. Can do.
The above can be applied not only to CD-R and DVD-R but also to an optical information recording medium compatible with blue laser.
[0015]
【Example】
Next, examples of the present invention will be described with specific numerical values.
Example 1
A polycarbonate resin is injection-molded using a stamper, and in FIGS. 1 and 2, a disc shape having a refractive index of 1.59 having a center hole 4 having a thickness of 0.587 mm, an outer diameter of 120 mm, and an inner diameter of 15 mm, A stamper groove 4a is formed on the outer peripheral side of the center hole 4 on one main surface, and a clamping area a is formed 15 to 22 mm from the center hole 4 outside the stamper groove 4a. A data recording area b is provided on the outer peripheral side of the area a, and the clamping area a and the data recording area b are continuously pregrooves for tracking guides having a half-value width of 0.31 μm, a depth of 140 nm, and a pitch of 0.74 μm. 3 and the first substrate 1 on which the dummy groove 3a was formed were prepared.
A solution of trimethine cyanine dye is formed on the clamping area a and the data recording area b in which the pre-groove 3 and the dummy groove 3a are formed on the first substrate 1 by a spin coating method (the leveling rate is 0.38). ), A recording layer 12 having a thickness of 60 nm was formed.
A reflective layer 13 having a thickness of 0.1 μm is formed on the recording layer 12 by sputtering gold. Next, a resin film made of a resin liquid containing an ultraviolet curable resin as a main component may be formed on the reflective layer 13, and this may be cured with an ultraviolet ray to form a protective film having a thickness of 2 to 5 μm. However, an adhesive mainly composed of an ultraviolet curable resin is applied onto the reflective layer 13 by a spin coating method, and the same material, shape, and dimensions as those of the first substrate are used. The second substrate 5 in which the dummy groove is not formed and the stamper groove is formed is bonded so that the stamper grooves of both the substrates face each other, and the adhesive coating film is irradiated with ultraviolet rays from the second substrate 5 side. The optical disk was obtained by curing by irradiation, bonding the second substrate 5 to the reflective layer 13, and bonding the two substrates together.
Next, the ultraviolet curable ink for the image forming layer shown below is continuously applied to the exposed surface of the second substrate 5, that is, the surface including the surfaces corresponding to the clamping area a and the data recording area b. Then, printing was performed by screen printing, and the printed film was cured by irradiating with ultraviolet rays to form an image forming layer 15 having a surface of a mat but a transparent thickness of 12 μm as a whole.
Special acrylic acrylate (Nippon Kayaku Co., Ltd.) (UV curable resin)
35 parts by weight polyester acrylate (manufactured by Toa Gosei Co., Ltd.) (other binders)
25 parts by weight synthetic silica (manufactured by Shionogi Co., Ltd.) (pigment) 30 parts by weight Irgacure 184 (photopolymerization initiator) 10 parts by weight This composition (pigment is 30% in solid content by weight) is stirred and mixed, An ultraviolet curable ink for the forming layer was produced.
[0016]
The optical disc with an image-forming layer thus obtained is used for, for example, a DVD-R, and is initially accelerated and is allowed to stand for 24 hours in an atmosphere of 70 ° C. and 85% relative humidity after the manufacture. About what performed the deterioration test, and what performed the accelerated deterioration test for 100 hours on the same conditions, it printed with the inkjet printer.
When the image forming layer on which the printed image was formed was visually observed, the boundary corresponding to each of the clamping area a and the data recording area b could not be distinguished depending on the reflected light under sunlight.
Also, using a thermal transfer printer (manufactured by PRIMERA), printing each color using a blue, red, green, and black printer ribbon on a different location of each image-forming layer, and examining the thermal transfer printing performance , Both exhibit good printability, excellent resolution, and when the image-forming layer on which the printed image is formed is visually observed, depending on the reflected light under sunlight, the clamping area a and the data recording area The boundary corresponding to each of b was not distinguished.
[0017]
Example 2
As shown in FIG. 3, in Example 1, the recording area 12 and the reflective layer 13 were formed in the same manner except that the clamping area a was set to 22 to 26 mm from the center hole. The protective layer 14 similar to the above is formed, and the UV curable ink for the underlayer shown below is printed thereon by the screen printing method, and the printed film is cured by irradiating the ultraviolet ray, and the milky white thickness is 12 μm. The UV curable ink used in Example 1 was printed by screen printing, and the printed film was irradiated with UV to cure the printed film, and the surface was a mat. As a whole, an image forming layer 15 having a transparent thickness of 12 μm was formed.
Special acrylic acrylate (Nippon Kayaku Co., Ltd.) (UV curable resin)
28 parts by weight polyester acrylate (manufactured by Toa Gosei Co., Ltd.) (other binders)
20 parts by weight synthetic silica (manufactured by Shionogi Co., Ltd.) (pigment) 16 parts by weight titanium oxide (white pigment) 28 parts by weight Irgacure 184 (photopolymerization initiator) 8 parts by weight This composition (44% in solid content by weight) %) Was stirred and mixed to produce an ultraviolet curable ink for the underlayer.
The optical disk with an underlayer-containing image-forming layer thus obtained is used for, for example, a CD-R. Under the same test conditions as in Example 1, printability by an ink jet printer and thermal transfer printing performance are achieved. When investigated, all showed good printability and excellent resolution. In addition, since the background was milky white, the color was displayed accurately as if the image was formed on white paper.
When the image forming layer on which the printed image was formed was visually observed, the boundary corresponding to each of the clamping area a and the data recording area b could not be distinguished depending on the reflected light under sunlight.
In the case of this example, a base layer with a high pigment content is formed, and in this case, even when printing by an inkjet printer or thermal transfer printing is performed, even if the printability and resolution are poor, a comparison of the pigment content is performed on it. By providing a relatively small number of layers, these can be improved and the background color can be arbitrarily selected.
[0018]
Example 3
In Example 1, the UV curable ink for the image forming layer was used in the same manner except that the UV curable ink having a pigment content of 10% in the solid content on a weight basis was used. An optical disk with an image forming layer was prepared, and the thermal transfer printing performance was also examined under the same test conditions as in Example 1. As a result, all showed good printability and excellent resolution.
When the image forming layer on which the printed image was formed was visually observed, the boundary corresponding to each of the clamping area a and the data recording area b could not be distinguished depending on the reflected light under sunlight.
[0019]
Comparative Example 1
In the first embodiment, a tracking pre-groove is provided from a diameter of 43 mm, a dummy group is not formed in the clamping area a, and a recording layer 12 and a reflective layer 13 are not formed in that region. In the same manner, an optical disk with an image-forming layer was prepared, and the printability and thermal transfer printing performance with an ink jet printer were examined under the same test conditions as in Example 1. However, when the image forming layer on which the printed image was formed was visually observed, a boundary corresponding to each of the clamping area a and the data recording area b was recognized by reflected light under sunlight, and the groove It was found that there was a difference in appearance in the presence / absence part and the border was clearly visible.
[0020]
The image forming layer may be an ink receiving layer capable of inkjet printing or a thermal transfer layer capable of thermal transfer printing. In the case of an ink receiving layer, for example, an ink described in JP-A-10-149576 A receiving layer may be used.
In the above embodiment, a dummy grave is extended in the clamping area. However, the second pre-gleeve extended in the clamping area may be a dummy grave or a groove used for recording. Preferably, an information recording area (data It is to continuously extend the pre-grave of the recording area b).
The present invention can also be applied to a disk structure as disclosed in Japanese Patent Application Laid-Open No. 11-120594. When laser light is incident from the cover layer side as seen in this structure, a laser is used. An image forming layer may be provided on the side opposite to the light incident side.
[0021]
【The invention's effect】
According to the present invention, since at least the reflective film is provided also in the clamping area, the boundary between the recording area and the clamping area is not recognized by light reflection, and the same color is applied to the inner peripheral side. to allow the image formation as visible, this is able to provide an optical information recording medium which can be a more effective by providing a dummy groove in the clamping area.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of a section of a part of a bonded optical disk according to an embodiment of the present invention.
FIG. 2 is a detailed partial cross-sectional view of the optical disc after completion.
FIG. 3 is a schematic explanatory view of a cross section of a part of an optical disk according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st board | substrate 5 2nd board | substrate 12 Recording layer 13 Reflective layer 15 Image formation layer

Claims (3)

An information recording area composed of a pregroove formed on the substrate, a recording layer, and a reflective layer, and a clamping area located on the inner circumference side from a position corresponding to the information recording area. in the optical information recording medium comprising a an image forming layer, the reflective layer, the information recording area beyond extending in the clamping area, and the second pregroove said clamping area with the reflective layer An optical information recording medium characterized in that the optical information recording medium is extended. At least information is recorded or recorded on the outer peripheral side of the translucent substrate having a center hole and having a track groove guide pregroove formed on one main surface side, leaving a constant region from the inside to the outside. A recording layer and a reflective layer are sequentially provided, and at least an image forming layer is provided directly on the uppermost layer or via another light-transmitting substrate, and the other main surface side of the one light-transmitting substrate is recorded. In the optical information recording medium on which at least the reproduction light is incident between light and reproduction light, the certain area or a certain area on the surface of the other translucent substrate corresponding to the certain area is a clamping area. In addition, at least the reflective layer and the image forming layer are provided in the clamping area of the one translucent substrate, or at least the reflective layer is provided in the clamping area of the one translucent substrate and the other of Only set at least the coating image layer in the clamping area of the optical substrate, and a clamping area of one of the translucent substrate wherein forming the dummy grooves are similar grooves and pregroove for tracking formic guide, the other the optical information recording medium you characterized in that may not be formed even when forming the dummy grooves on the surface facing the clamping area of one of the translucent substrate wherein in the case of using a light-transmitting substrate . The optical information recording medium according to claim 1 or 2 recording layer is characterized by containing the organic dye.

Images