JP2004192700A - Manufacturing method for optical information recording medium and manufacturing apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing apparatus for an optical disk capable of manufacturing the optical disk which is free from a variance in recording characteristics due to the position of a recording layer. <P>SOLUTION: The manufacturing device 31 for the optical disk is constituted of a pair of vacuum chucks 33 and 35. A first substrate 3 of the optical disk is held by a holding plate 59 of the vacuum chuck 33 by vacuum suction and a second substrate 9 of the optical disk is held by a holding diffusion plate 53 of the vacuum chuck 35 by vacuum suction. The vacuum chuck 35 is provided with a light guide plate 37 disposed so as to be opposed to the holding diffusion plate 53 and a lamp 41 disposed on the side surface 39 of the light guide plate 37. An ultraviolet ray UV generated from the lamp 41 is made to be a surface light source by the light guide plate 37 and diffused by the holding diffusion plate 53 to irradiate a hologram recording material 91 with the diffused ultraviolet ray UV. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing an optical information recording medium on which information is recorded by holography and an apparatus for manufacturing the same.
[0002]
[Prior art]
2. Description of the Related Art A method of recording information in the form of image information by holography at a high density on an optical information recording medium such as an optical disk has been known. Such an optical disc has a structure in which a reflective layer, a first transparent substrate, a recording layer containing a hologram recording material cured in a gel state, and a second transparent substrate are laminated (for example, see Patent Document 1).
[0003]
[Patent Document 1]
[0004]
International Publication No. WO 99/44195 pamphlet (FIGS. 39 and 40) In recording image information in the above-described method, an information beam carrying image information and a recording reference beam are generated by a laser beam, and these beams are generated by a laser beam. (2) It is realized by irradiating the optical disc from the transparent substrate side, superposing the recording reference light and the information light reflected by the reflection layer on the recording layer, and recording the interference fringes generated by the interference of these lights on the recording layer. You. A region of the recording layer where the interference fringes are recorded becomes a hologram. On the other hand, when the reproduction illumination light is irradiated from the side of the second transparent substrate to the recording layer on which the interference fringes are recorded, the light is diffracted by the interference fringes to generate reproduction light, which is transmitted through the second transparent substrate. , The image information is reproduced.
[0005]
[Problems to be solved by the invention]
Now, according to the above-mentioned optical disc, the hologram recording material cured into a gel is used as the recording layer. Therefore, if the entire hologram recording material is not uniformly cured in a gel state, the recording characteristics vary depending on the position of the recording layer.
[0006]
The present invention has been made in view of the above problems, and has as its object to provide a method of manufacturing an optical information recording medium in which recording characteristics do not vary depending on the position of a recording layer, and an apparatus for manufacturing the same.
[0007]
[Means for Solving the Problems]
The first apparatus for manufacturing an optical information recording medium according to the present invention sandwiches a recording layer containing a hologram recording material cured in a gel state by irradiated light between a first substrate and a second substrate having optical transparency. An apparatus for manufacturing an optical information recording medium having a structure supported by: a light-emitting member, a light guide member having a side surface on which light from the light-emitting member is incident and using the light as a surface light source, and a second substrate. A holding and diffusing member for holding and diffusing the light of the surface light source toward the hologram recording material disposed between the first substrate and the second substrate; and a first substrate arranged to face the holding and diffusing member. And a holding member for holding the.
[0008]
According to the first manufacturing apparatus, it is possible to irradiate the hologram recording material disposed between the first substrate and the second substrate with the light from the light emitter through the light guide member and the holding diffusion member. For this reason, since the entire hologram recording material can be irradiated with light having a uniform brightness, the hologram recording material can be cured without unevenness. Further, since the holding and diffusing member performs both functions of holding the second substrate and diffusing light, it is possible to reduce the size of the manufacturing apparatus.
[0009]
In the first manufacturing apparatus, the holding / diffusion member may hold the second substrate by vacuum suction, and may further include a side wall that forms an exhaust port for vacuum suction and forms a space with the holding / diffusion member. According to this, the exhaust port is formed in the side wall. Therefore, since the exhaust port can be arranged outside the optical path of the light to be applied to the hologram recording material, the exhaust port does not become an obstacle for generating the light having the uniform brightness.
[0010]
The second apparatus for manufacturing an optical information recording medium according to the present invention sandwiches a recording layer containing a hologram recording material cured in a gel state by irradiated light between a first substrate and a second substrate having optical transparency. An apparatus for manufacturing an optical information recording medium having a structure supported by: a first holding member for holding a first substrate, and a light for holding a second substrate and being arranged to face the first holding member. A light-transmitting second holding member, a light-emitting member, a light guide member having a side surface on which light from the light-emitting member is incident and using the light as a surface light source, a first substrate held by the first holding member, and a A diffusing member for diffusing the light of the surface light source toward the hologram recording material disposed between the second substrate and the second substrate held by the holding member.
[0011]
According to the second manufacturing apparatus, the entire hologram recording material can be irradiated with light having a uniform brightness for the same reason as the first manufacturing apparatus, so that the hologram recording material can be cured without unevenness. . Further, since the diffusion member and the second holding member are separately provided, it is possible to select an optimum material and dimensions for each of the diffusion member and the second holding member.
[0012]
In the second manufacturing apparatus, the second holding member may hold the second substrate by vacuum suction, further include an exhaust port for vacuum suction, and further include a side wall that forms a space with the second holding member. it can. According to this, for the same reason as in the first manufacturing apparatus, the exhaust port does not become an obstacle to generate the light having the uniform brightness.
[0013]
The third apparatus for manufacturing an optical information recording medium according to the present invention sandwiches a recording layer containing a hologram recording material cured in a gel state by irradiated light between a first substrate and a second substrate having optical transparency. An apparatus for manufacturing an optical information recording medium having a structure supported by: a first holding member for holding a first substrate, and a light for holding a second substrate and being arranged to face the first holding member. A second substrate having a transmissive second holding member, a light-emitting body, and a side surface on which light from the light-emitting body enters, and the light being used as a surface light source, and then the first substrate and the second holding member held by the first holding member And a light guide member for irradiating the hologram recording material disposed between the second substrate and the second substrate.
[0014]
According to the third manufacturing apparatus, it is possible to irradiate the light from the light emitting body to the hologram recording material disposed between the first substrate and the second substrate through the light guide member. For this reason, since the entire hologram recording material can be irradiated with light having a uniform brightness, the hologram recording material can be cured without unevenness.
[0015]
In the third manufacturing apparatus, the light guide member may diffuse light toward the hologram recording material. According to this, it is possible to irradiate the entire hologram recording material with light having a uniform brightness.
[0016]
The method for manufacturing an optical information recording medium according to the present invention is directed to a method for manufacturing a light source having a structure in which a recording layer containing a hologram recording material cured in a gel state is supported by a first substrate and a second substrate having optical transparency. A method for manufacturing an information recording medium, comprising: arranging a hologram recording material before gelation between a first substrate and a second substrate; and arranging light from a light emitter to a surface light source with a light guide member. Forming a recording layer by irradiating the hologram recording material arranged in the arranging step with the light of the surface light source from the second substrate side to form a recording layer.
[0017]
According to the method for manufacturing an optical information recording medium according to the present invention, the hologram recording material before gelation disposed between the first substrate and the second substrate is irradiated with light from the light emitter through the light guide member. ing. Therefore, since the entire hologram recording material can be irradiated with light having a uniform brightness, the hologram recording material can be cured without unevenness.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a method for manufacturing an optical disk (an example of an optical information recording medium) and an apparatus for manufacturing the optical disk according to an embodiment of the present invention will be described with reference to the drawings. First, the structure of an optical disk manufactured by using this method or apparatus will be briefly described. FIG. 1 is a sectional view of the optical disk. The optical disc 1 has a structure in which a first substrate 3 having light transmittance, a reflective layer 5, a recording layer 7, and a second substrate 9 having light transmittance are laminated, and a center hole 11 penetrating these layers is formed. Have. The recording layer 7 containing the hologram recording material is cured in a gel state, and is supported between the first substrate 3 and the second substrate 9. The optical disk 1 is irradiated with the laser beam L used for recording and reproducing the hologram from the second substrate 9 side. A spindle of a device for recording / reproducing an optical disk is fixed to the center hole 11.
[0019]
The configuration of the optical disk manufacturing apparatus according to one embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a sectional view of the optical disk manufacturing apparatus 31. FIG. 3 is a plan view of one of the vacuum chucks constituting the device 31 as viewed from the holding diffusion plate side. The optical disc manufacturing apparatus 31 includes a vacuum chuck 33 disposed on the lower side and a vacuum chuck 35 disposed on the upper side to face the vacuum chuck 33.
[0020]
The vacuum chuck 35 includes a light guide plate 37 made of an acrylic resin or the like having a square planar shape and a wedge-shaped cross section, and a lamp 41 (an example of a light emitting body) arranged along a side surface 39 forming one side of the light guide plate 37. And a reflector 43 attached to the side surface 39 so as to cover the lamp 41. Examples of the lamp 41 include a high-pressure ultraviolet lamp, a low-pressure ultraviolet lamp, and a black light. Ultraviolet rays UV from the lamp 41 enter the light guide plate 37 from the side surface 39 of the light guide plate 37. The light guide plate 37 has a function of using incident light as a surface light source. The reflector 43 reflects the ultraviolet rays UV from the lamp 41 toward the light guide plate 37.
[0021]
On three side surfaces and the upper surface other than the side surface 39 of the light guide plate 37, a reflection sheet 45 for reflecting the ultraviolet rays UV reaching these surfaces toward the inside of the light guide plate 37 again is arranged. The lower surface of the light guide plate 37 is processed into a prism surface 47, that is, a surface on which many prisms are formed. A square frame-shaped side wall 49 is fixed to the edge of the prism surface 47. The material of the side wall portion 49 is stainless steel, ceramics, or the like. The side wall 49 is provided with an exhaust port 51 connected to a vacuum pump.
[0022]
A space 55 is formed by the side wall portion 49 and the square holding diffusion plate 53 (an example of a holding diffusion member). The holding diffusion plate 53 is fixed to the inner peripheral surface of the side wall portion 49 by a sealing material (not shown) such as silicon rubber. A plurality of through holes 57 are formed in the holding diffusion plate 53, and the second substrate 9 (FIG. 1) is vacuum-adsorbed to the through holes 57 by evacuating the air A from the exhaust port 51 to hold the diffusion plate 53. Hold with. The holding diffusion plate 53 also functions as a diffusion plate. Therefore, the light from the light guide plate 37 is diffused by the holding diffusion plate 53 and is applied to the hologram recording material via the second substrate 9. The holding diffusion plate 53 is obtained by mixing diffusion particles into a transparent member such as glass or plastic.
[0023]
On the other hand, the vacuum chuck 33 has a square holding plate 59 (an example of a holding member) arranged to face the holding diffusion plate 53 and a base plate 61 supporting the holding plate 59. An exhaust port 63 connected to a vacuum pump is provided at the center of the base plate 61. The base plate 61 has a structure in which a side surface portion 65 stands up from a surface portion 67. In the side part 65, the holding plate 59 is fixed to the base plate 61 by a sealing material (not shown) such as silicon rubber. Thereby, a space 69 is formed between the holding plate 59 and the surface portion 67. In addition, it can also be fixed with an adhesive. Further, packing by an O-ring, that is, an O-ring may be arranged on the surface portion 67 along the side surface portion 65 and the holding plate 59 may be arranged on the O-ring. When the thickness of the holding diffusion plate 53 or the holding plate 59 is, for example, 3 cm, the distance between the holding diffusion plate 53 and the prism surface 47 and the distance between the holding plate 59 and the surface portion 67 are, for example, 0.5 mm.
[0024]
A plurality of through holes 71 are formed in the holding plate 59. By extracting air A from the exhaust port 63, the first substrate 3 (FIG. 1) in which the reflective layer 5 is formed in the through-hole 71 is vacuum-sucked and held by the holding plate 59.
[0025]
Since ultraviolet rays UV from the lamp 41 are irradiated from the vacuum chuck 35 side, the holding diffusion plate 53 of the vacuum chuck 35 is made of a transparent material such as glass or plastic. On the other hand, since the holding plate 59 and the base plate 61 of the vacuum chuck 33 do not need to have optical transparency, for example, an opaque material such as stainless steel or ceramics, or the above-mentioned transparent material may be used. When irradiating ultraviolet rays for photocuring also from the vacuum chuck 33 side, the material of the holding plate 59 and the base plate 61 is the same as that of the holding plate 53. The above is the structure of the optical disk manufacturing apparatus 31.
[0026]
The optical disk manufacturing apparatus 31 includes a holding diffusion plate 53 functioning as a diffusion plate and a light guide plate 37. For this reason, the entire hologram recording material disposed between the first substrate 3 and the second substrate 9 can be irradiated with the ultraviolet rays UV having a uniform brightness, so that the hologram recording material can be cured without unevenness. it can. Therefore, the uniformity of the recording characteristics of the optical disc 1 can be improved.
[0027]
Further, according to the optical disk manufacturing apparatus 31, since the exhaust port 51 is provided in the side wall portion 49, the exhaust port 51 can be located outside the optical path of the ultraviolet rays UV. Therefore, the exhaust port 51 does not become an obstacle for generating the ultraviolet rays UV having a uniform brightness.
[0028]
Further, according to the optical disk manufacturing apparatus 31, the holding diffusion plate 53 has a function of diffusing light in addition to the function of holding the second substrate 9. For this reason, since it is not necessary to newly provide a diffusion plate, the size of the manufacturing apparatus 31 can be reduced. Note that a holding plate and a diffusion plate can be provided instead of the holding diffusion plate 53. This will be described with reference to FIG. FIG. 4 is a sectional view of an optical disk manufacturing apparatus 81 according to another embodiment of the present invention. Elements that are the same as the elements indicated by the reference numerals in FIG. 2 are given the same reference numerals. The difference between the manufacturing apparatus 81 and the manufacturing apparatus 31 of FIG. 2 will be described.
[0029]
On the prism surface 47 of the manufacturing apparatus 81, a flattening film 85 made of, for example, a silicon oxide film is formed. On the flattening film 85, a diffusion plate 87 (an example of a diffusion member) in which diffusion particles are mixed into a transparent member such as glass or plastic is arranged. A side wall 49 is fixed to the edge of the diffusion plate 87. The second holding plate 89 is formed in the side wall portion 49 so that the space 55 is formed by the second holding plate 89 (an example of a second holding member) holding the second substrate 9 (FIG. 1) and the side wall portion 49. It is fixed to the peripheral surface. The ultraviolet rays UV diffused by the diffusion plate 87 are applied to the hologram recording material through the second holding plate 89, so that the second holding plate 89 is made of a light-transmitting material such as glass or plastic. The holding plate 59 is disposed so as to face the second holding plate 89, and functions as an example of a first holding member that holds the first substrate 3.
[0030]
According to the optical disk manufacturing apparatus 81, by providing the diffusion plate 87 and the second holding plate 89 separately, it is possible to select the optimum material and dimensions for each of the diffusion plate 87 and the second holding plate 89.
[0031]
In the optical disk manufacturing apparatus 31 shown in FIG. 2, a holding plate having no diffusion function may be used instead of the holding diffusion plate 53. In this case, the light guide plate 37 may have a light diffusion function by mixing diffusion particles into the light guide plate 37.
[0032]
Next, a method for manufacturing an optical disk according to an embodiment of the present invention will be described. In this method, the optical disk manufacturing apparatus 31 shown in FIG. 2 is used, but the optical disk manufacturing apparatus 81 shown in FIG. 4 can also be used. 5 and 6 are cross-sectional views corresponding to the cross section of FIG. First, as shown in FIG. 5, a resin is applied on a smooth glass substrate 13, and a preformat layer 17 having pits 15 is formed using a stamper (not shown), thereby manufacturing the first substrate 3. As a result, the servo information and the address information of the sector marks and tracks are preformatted in advance using the pits 15. The thickness of the first substrate 3 is, for example, 5 to 1200 μm. Instead of the glass substrate 13, a quartz substrate or a diamond substrate can be used. Further, the first substrate 3 having no preformat layer 17 is also possible. That is, the first substrate 3 with the pits 15 is manufactured by injection molding using a resin such as polycarbonate. The thickness and material of the second substrate 9 shown in FIG. However, since the first substrate 3 does not need to have optical transparency, it is also possible to select a non-transparent material.
[0033]
Next, as shown in FIG. 6, a reflective layer 5 made of aluminum is formed on the surface of the first substrate 3 where the pits 15 are formed, by vapor deposition, sputtering, or the like. The thickness of the reflective layer 5 is, for example, 30 to 500 nm. The reflective layer 5 may be a metal having a property of reflecting the laser light L, and may be silver, gold, silicon, or the like in addition to aluminum.
[0034]
Ring-shaped spacers 19 and 21 are bonded to the edge of the first substrate 3 via the reflection layer 5. The material of the spacers 19 and 21 is, for example, stainless steel, ceramics, or plastic, and the thickness thereof corresponds to the thickness of the recording layer 7.
[0035]
Next, using the optical disc manufacturing apparatus 31 shown in FIG. 2, the structure including the first substrate 3 shown in FIG. 6 and the second substrate 9 are arranged to face each other, and the recording layer 7 is formed therebetween. More specifically, as shown in FIG. 7, in the vacuum chuck 35, the second substrate 9 is vacuum-adsorbed to the holding diffusion plate 53 by exhausting the air A in the space 55 through the exhaust port 51 using a vacuum pump. . Similarly, the first substrate 3 having the structure shown in FIG. As described above, the first substrate 3 is held by the holding plate 59, and the second substrate 9 is held by the holding diffusion plate 53.
[0036]
Next, a hologram recording material before gelation is prepared. When the recording layer 7 is irradiated with laser light L serving as information light or reference light for a predetermined time, the material has an optical characteristic (refractive index, absorptivity, transmittance, fluorescence, etc.) depending on the intensity of the laser light L. Luminescence, reflectance, etc.). This material is, for example, a photopolymerizable organic material that is polymerized by being exposed to the laser beam L, and specifically, for example, a photopolymer (Photopolymers) HRF-600 (product name) manufactured by Dupont. .
[0037]
After the hologram recording material 91 before gelation is applied on the first substrate 3 via the reflective layer 5, as shown in FIG. 8, the distance between the vacuum chuck 33 and the vacuum chuck 35 is reduced, so that the second substrate 9 is pressed against the first substrate 3. Thereby, the hologram recording material 91 is thinly stretched between the first substrate 3 and the second substrate 9 (arrangement step).
[0038]
Then, as shown in FIG. 9, ultraviolet rays UV are generated from the lamp 41. Ultraviolet rays UV enter the light guide plate 37 from the side surface 39 and are used as a surface light source. The ultraviolet light UV used as the surface light source is bent by the prism surface 47 and advances toward the holding diffusion plate 53 side. Then, the ultraviolet rays UV are diffused by the holding diffusion plate 53, and then are applied to the hologram recording material 91 via the second substrate 9. The curing of the hologram recording material 91 is preliminary curing (precuring), and the conditions are, for example, as follows. The wavelength of the ultraviolet light is 350 to 450 nm, the irradiation time of the ultraviolet light is 2 to 10 minutes, and the output of the lamp 41 is 100 W.
[0039]
Thereby, a recording layer 7 having a thickness of, for example, 10 to 200 μm and cured in a gel state is formed (forming step). The purpose of the pre-curing is to stabilize the recording layer 7 by preventing the recording layer 7 from flowing, and to prevent the recording layer 7 from cracking by reducing the degree of contraction of the recording layer 7 during recording. is there. Thus, the optical disc 1 shown in FIG. 1 is completed.
[0040]
According to the optical disc manufacturing method according to the present embodiment, in the preliminary curing, the ultraviolet light UV from the lamp 41 is disposed between the first substrate 3 and the second substrate 9 through the light guide plate 37 and the holding diffusion plate 53. The hologram recording material 91 before gelation is irradiated. Therefore, the entire hologram recording material 91 can be irradiated with light having a uniform brightness, so that the hologram recording material 91 can be cured without unevenness.
[0041]
In addition, according to the optical disc manufacturing method according to the present embodiment, the hologram recording material 91 is irradiated with the ultraviolet rays UV from the second substrate 9 side on which the reflection layer 5 is not formed. However, as described later, when the reflectance of the reflective layer 5 is relatively low (for example, about 15%), the hologram recording material 91 is irradiated with ultraviolet rays UV from the first substrate 3 side on which the reflective layer 5 is formed. You can also.
[0042]
Finally, the optical disc 1 manufactured in the present embodiment will be described. FIG. 10 is a plan view of the optical disc 1. The optical disc 1 has a disk shape, and digital information is recorded by holography. The optical disk 1 has a spiral track 23 that is continuous from the inner circumference to the outer circumference. The tracks may be concentric. The track 23 has a configuration in which recording areas and preformat areas are alternately arranged. Digital information is recorded in the recording area in the form of a hologram. In the preformat area, servo information, address information, and the like are recorded in advance when the optical disc 1 is manufactured using the pits 15 (FIG. 1).
[0043]
There are, for example, the following three methods for recording and reproducing information on the optical disk 1 using volume holography, which is one mode of holography. 11 is a diagram for explaining the first system, FIG. 12 is a diagram for explaining the second system, and FIG. 13 is a diagram for explaining the third system. FIGS. 11 to 13 are enlarged views of a part of the optical disc 1. 11 to 13, the same elements as those indicated by the reference numerals in FIG. 1 are denoted by the same reference numerals. According to the above recording, interference fringes can be three-dimensionally written on the recording layer 7 of the optical disc 1, and the recording density can be increased.
[0044]
The first system is a so-called reflection type system. As shown in FIG. 11, the focused laser beam L by the lens 93 of the optical head contains the information light and the recording-specific reference light, reflected by the reflecting layer 5 and the recording-specific reference light L _R information beam L _I Are caused to interfere with each other in the recording layer 7, and the interference fringes generated thereby are recorded on the recording layer 7 as a hologram H. FIG. 14 is a plan view of a part of the hologram group. By slightly rotating the optical disc 1, a new hologram H (in this case, a hologram H2) that partially overlaps the hologram H (for example, a hologram H1) formed earlier is formed on the recording layer 7. . By repeating this, the interference fringe pattern is multiplex-recorded on the recording layer 7.
[0045]
On the other hand, when the hologram H is irradiated with laser light L, which is reproduction illumination light, via the lens 93, this light is diffracted by the hologram H, and reproduction light is generated. Image information is reproduced through the lens 93 based on the reproduction light detected by the optical head.
[0046]
The second system is a so-called transmission system. As shown in FIG. 12, the lens 93A and the lens 93B of the optical head are arranged on the second substrate 9 side. And focused information light L _I in the lens 93A, and the recording reference light L _R focused by the lens 93B, is a cross in the recording layer 7, writes the hologram H formed on the portion in the recording layer 7. In this method, the reflection layer 5 is not used for forming the hologram H. The reflection layer 5 is used for focusing, tracking, addressing, and the like. By irradiating the hologram H with reproduction illumination light via the lens 93B, reproduction light is generated.
[0047]
The third system is also a so-called transmission system. In this method, the recording layer 7 is irradiated with a parallel light beam formed by a lens system (not shown) arranged on the first substrate 3 side, as shown in FIG. ing. And focused information light L _I in the lens 93A, and the recording reference light L _R parallel beam by the lens system, is a cross in the recording layer 7, write the hologram H formed on the portion in the recording layer 7 Put in. By irradiating the hologram H with reproduction illumination light of a parallel light beam formed by the lens system, reproduction light is generated. In this method, since the recording reference light _LR and the reproduction illumination light must pass through the reflective layer 5, the reflective layer 5 is made of, for example, gold or silicon and has a light reflectance of about 15%. . Also in this method, the reflection layer 5 is not used for forming the hologram H, but is used for focusing, tracking, addressing, and the like. Incidentally, irradiating the information beam L _I from the first substrate 3 side, it may be irradiated with recording reference light L _R and the reproduction illumination light from the second substrate 9 side.
[0048]
The optical disk manufactured by the manufacturing method according to the present embodiment may have a storage area of a flat plate shape (for example, a disk shape), and is not related to the outer shape of the optical disk. For example, these embodiments can be applied to the manufacture of an optical disc having a flat recording area in a card shape having a size of a business card, such as a triangle, a quadrangle or a hexagon.
[0049]
【The invention's effect】
As described above, according to the first, second, and third manufacturing apparatuses and manufacturing methods of an optical information recording medium according to the present invention, it is possible to irradiate the entire hologram recording material with light of uniform brightness. Therefore, the hologram recording material can be cured without unevenness. Therefore, the uniformity of the recording characteristics of the optical information recording medium can be improved.
[0050]
Further, according to the first manufacturing apparatus, the holding and diffusing member performs both functions of holding the second substrate and diffusing light, so that the manufacturing apparatus can be downsized.
[0051]
Further, according to the second manufacturing apparatus, since the diffusion member and the second holding member are separately provided, it is possible to select an optimum material and dimensions for each of the diffusion member and the second holding member.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an optical disc manufactured by a manufacturing method according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the optical disc manufacturing apparatus according to one embodiment of the present invention.
FIG. 3 is a plan view of a vacuum chuck provided in the optical disc manufacturing apparatus of FIG. 2;
FIG. 4 is a sectional view of an optical disc manufacturing apparatus according to another embodiment of the present invention.
FIG. 5 is a cross-sectional view of a first substrate for describing a first step of a method for manufacturing an optical disc according to one embodiment of the present invention.
FIG. 6 is a cross-sectional view of a first substrate for describing a second step of the method for manufacturing an optical disc according to one embodiment of the present invention.
FIG. 7 is a cross-sectional view of the optical disk manufacturing apparatus for describing a third step of the optical disk manufacturing method according to one embodiment of the present invention.
FIG. 8 is a cross-sectional view of an optical disk manufacturing apparatus for describing a fourth step of the optical disk manufacturing method according to one embodiment of the present invention.
FIG. 9 is a cross-sectional view of an optical disk manufacturing apparatus for describing a fifth step of the optical disk manufacturing method according to one embodiment of the present invention.
FIG. 10 is a plan view of the optical disc of FIG. 1;
FIG. 11 is a schematic cross-sectional view illustrating a first method of recording and reproducing information on and from the optical disk of FIG. 1 and enlarging a part of the optical disk.
12 is a schematic cross-sectional view illustrating a second system for recording and reproducing the optical disk of FIG. 1 and enlarging a part of the optical disk.
13 is a schematic cross-sectional view illustrating a third method of recording and reproducing information on and from the optical disk of FIG. 1 and enlarging a part of the optical disk.
FIG. 14 is a plan view of a part of a hologram group formed on a recording layer of the optical disc of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Optical disk, 3 ... 1st substrate, 5 ... Reflective layer, 7 ... Recording layer, 9 ... 2nd substrate, 11 ... Center hole, 13 ... Glass substrate, 15 pit, 17 preformat layer, 19, 21 spacer, 23 track, 31 optical disk manufacturing device, 33, 35 vacuum chuck, 37 lead Light plate, 39 ... side surface, 41 ... lamp, 43 ... reflector, 45 ... reflection sheet, 47 ... prism surface, 49 ... side wall, 51 ... exhaust port, 53 ... .. Holding diffusion plate, 55 ... space, 57 ... through hole, 59 ... holding plate, 61 ... base plate, 63 ... exhaust port, 65 ... side surface, 67 ...・ Surface part, 69 ・ ・ ・ Space, 71 ・ ・ ・ Through hole, 81 ・ ・ ・ Optical disk manufacturing device, 83 ・ ・ ・ Vacuum chuck 85 ... flattening film, 87 ... diffusion plate, 89 ... second holding plate, 91 ... hologram recording material, 93,93A, 93B ... lens

Claims (7)

An apparatus for manufacturing an optical information recording medium having a structure in which a recording layer containing a hologram recording material cured in a gel state by irradiated light is supported between a first substrate and a second substrate having optical transparency. So,
A luminous body,
A light guide member having a side surface on which light from the illuminant is incident and making this light a surface light source,
A holding and diffusing member that holds the second substrate and diffuses the light of the surface light source toward the hologram recording material disposed between the first substrate and the second substrate;
A holding member arranged to face the holding diffusion member and holding the first substrate;
An optical information recording medium manufacturing apparatus, comprising: The holding diffusion member holds the second substrate by vacuum suction,
2. The apparatus for manufacturing an optical information recording medium according to claim 1, further comprising a side wall portion formed with an exhaust port for the vacuum suction and forming a space with the holding diffusion member. An apparatus for manufacturing an optical information recording medium having a structure in which a recording layer containing a hologram recording material cured in a gel state by irradiated light is supported between a first substrate and a second substrate having optical transparency. So,
A first holding member for holding the first substrate;
A light-transmissive second holding member arranged to face the first holding member and holding the second substrate;
A luminous body,
A light guide member having a side surface on which light from the illuminant is incident and having this light as a surface light source,
Diffusion for diffusing light from the surface light source toward the hologram recording material disposed between the first substrate held by the first holding member and the second substrate held by the second holding member Components,
An optical information recording medium manufacturing apparatus, comprising: The second holding member holds the second substrate by vacuum suction,
4. The apparatus for manufacturing an optical information recording medium according to claim 3, further comprising a side wall portion formed with an exhaust port for the vacuum suction and forming a space with the second holding member. An apparatus for manufacturing an optical information recording medium having a structure in which a recording layer containing a hologram recording material cured in a gel state by irradiated light is supported between a first substrate and a second substrate having optical transparency. So,
A first holding member for holding the first substrate;
A light-transmissive second holding member arranged to face the first holding member and holding the second substrate;
A luminous body,
After having a side surface on which light from the illuminant is incident and using this light as a surface light source, the first substrate held by the first holding member and the second substrate held by the second holding member, A light guide member for irradiating the hologram recording material disposed between,
An optical information recording medium manufacturing apparatus, comprising: The optical information recording medium manufacturing apparatus according to claim 5, wherein the light guide member diffuses light toward the hologram recording material. A method for manufacturing an optical information recording medium having a structure in which a recording layer containing a hologram recording material cured in a gel state is supported by being sandwiched between a first substrate and a second substrate having optical transparency,
An arranging step of arranging the hologram recording material before gelation between the first substrate and the second substrate;
After the light from the illuminant is turned into a surface light source by the light guide member, the light of the surface light source is irradiated from the second substrate side to the hologram recording material arranged in the arrangement step, thereby causing gelation. A forming step of forming the recording layer;
A method for manufacturing an optical information recording medium, comprising:

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