JP2006040396A - Method for manufacturing information recording medium and information recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an information recording medium which can manufacture the information recording medium without the existence of an air bubble in a resin layer, which may give rise to the risk of blocking the transmission of a laser beam. <P>SOLUTION: In manufacturing the information recording medium in which a resin layer (spacer layer) is formed on an L0 recording layer 3 by applying and curing a resin material 4R so that the L0 recording layer 3 formed on a disk substrate 2 is covered, the resin layer (spacer layer) is formed by performing a first application process for applying the resin material 4R (first resin material) so that the L0 recording layer 3 is covered and a second application process for applying the resin material 4R (second resin material) on the applied resin material 4R, in this order, and then performing the curing process for curing both the resin materials 4R and 4R. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an information recording medium manufacturing method for manufacturing an information recording medium by forming a resin layer so as to cover the information recording layer, and an information recording medium on which the resin layer is formed so as to cover the information recording layer It is about.

As a method for manufacturing this type of information recording medium, the applicant manufactured a multilayer optical recording medium by forming two recording layers (recording layers L1, L0) on a base material with a spacer layer (resin layer) interposed therebetween. A manufacturing method is disclosed in Japanese Patent Laid-Open No. 2003-123331. In manufacturing this multilayer optical recording medium, first, a first recording layer is formed on a base material by sputtering. Next, a spacer layer is formed by applying a coating liquid (resin material) so as to cover the formed recording layer. At this time, the base material is placed on the turntable with the recording layer forming surface facing upward, and the coating liquid is dropped onto the central portion of the base material while rotating the turntable at a low speed. Subsequently, after the stamper is superimposed on the base material, the turntable is rotated at a high speed. At this time, the coating liquid dropped on the central portion of the base material flows and spreads between the base material (recording layer) and the stamper toward the outer edge portion by a centrifugal force generated as the turntable rotates. Next, the spread coating liquid is irradiated with ultraviolet rays so as to pass through the stamper. As a result, the coating liquid is cured between the base material (recording layer) and the stamper to form a spacer layer. Subsequently, after forming a second recording layer on the formed spacer layer by sputtering, a coating liquid (resin material) is applied and cured to form a cover layer. Thereby, a multilayer optical recording medium is completed.
JP 2003-123331 A (page 2-7, FIG. 1-5)

  However, the multilayer optical recording medium manufacturing method disclosed by the applicant has the following problems to be solved. That is, in the manufacturing method disclosed by the applicant, the coating liquid is spread over the entire area of the base material (recording layer) in a state where the stamper is overlapped after the coating liquid is dropped on the central portion of the base material, and the spacer layer is formed. Forming. In this case, the coating liquid used for the formation of the spacer layer is defoamed prior to the coating process and is free of bubbles, but when dropped onto the substrate (mainly from the dropping nozzle). At the moment when the discharged coating liquid reaches the substrate, ambient air may be involved. In this state, extremely small bubbles are included in the coating liquid used for forming the spacer layer. At this time, in the manufacturing method disclosed by the applicant, immediately after the dropping of the coating liquid is completed, the stamper is overlapped and spread to the outer edge portion. The stamper may remain in the coating liquid, that is, in the coating liquid. Therefore, when the coating liquid in this state is spread and then cured, extremely small bubbles may exist in the spacer layer formed between the base material and the stamper.

  In this case, in this type of multi-layer optical recording medium, focusing at the time of an interlayer jump when reproducing recording data recorded over two recording layers or recording recording data over two recording layers is performed. In order to shorten the time required for this, the spacer layer is formed to be thin so that the distance between both recording layers in the thickness direction of the multilayer optical recording medium is shortened. Further, in recent optical recording media, in order to improve recording density, recording data can be recorded and reproduced by a laser beam having a short wavelength (λ) output from a pickup having a large numerical aperture (NA). It is configured. Therefore, when irradiating the recording layer on the substrate side of the two recording layers during recording / reproducing of the recording data, it exists in the extremely thin spacer layer formed on the recording layer. There is a possibility that the passage of the laser beam is hindered by the bubbles that are generated, that is, the bubbles that exist in the immediate vicinity of the recording layer. For this reason, the multilayer optical recording medium manufactured according to this manufacturing method may cause a recording data recording / reproducing error, and this point is preferably improved.

  The present invention has been made in view of such a problem to be improved, and manufacture of an information recording medium capable of manufacturing an information recording medium without causing bubbles in the resin layer that may impede the passage of a laser beam. The main object is to provide a method and an information recording medium in which no bubbles are present in the resin layer.

  In order to achieve the above object, the method for producing an information recording medium according to the present invention comprises applying a resin material so as to cover the information recording layer formed on the support substrate and curing the resin material. When an information recording medium is manufactured by forming a resin layer on the first recording material, a first coating process for coating the first resin material so as to cover the information recording layer, and the top of the coated first resin material After the second coating process for coating the second resin material is performed in this order, a curing process for curing both the first and second resin materials is performed to form the resin layer. In this case, the information recording layer in the present invention includes both an information recording layer configured to record and reproduce recorded data, and a reproduction-only information recording layer in which recorded data is recorded at the time of manufacture. .

  In the method for manufacturing an information recording medium according to the present invention, the same kind of resin material is applied as the first and second resin materials.

  Furthermore, in the method for manufacturing the information recording medium according to the present invention, the first resin material is applied so that the thickness is in the range of 0.1 μm or more and 20 μm or less during the first application process.

  Further, in the method for manufacturing an information recording medium according to the present invention, as the second coating treatment, after the second resin material is dropped on the coated first resin material, The stamper is overlapped, and in this state, the second resin material is spread between the support base material and the stamper and applied.

  Furthermore, an information recording medium according to the present invention includes a support base, an information recording layer formed on the support base, and a resin layer formed so as to cover the information recording layer. The resin layer cures both the first and second resin materials in a state where the second resin material is applied on the first resin material applied so as to cover the information recording layer. Is formed.

  According to the method for manufacturing an information recording medium according to the present invention, the first resin material is applied so as to cover the information recording layer, and the second resin material is applied on the applied first resin material. Then, both the first and second resin materials are cured to form a resin layer, and immediately after dropping the resin material on the support base material, the stamper is overlapped and spread over the entire area of the support base material. Unlike the manufacturing method, even if air bubbles are included in the first resin material when dropped on the support base material, the air bubbles from the first resin material are not hindered from being obstructed, and smooth. Removed. Therefore, it is possible to avoid a situation in which bubbles are present in the very vicinity of the information recording layer in the first resin material. In addition, prior to curing the first resin material without bubbles, the second resin material is dropped on the applied first resin material, so that the supporting base is dropped when the second resin material is dropped. Since the surface of the material (information recording layer) has a certain level of wettability, a situation in which bubbles are included in the dropped second resin material can be avoided. Thereby, it is possible to avoid a situation in which bubbles exist in the resin layer in the vicinity of the information recording layer. Therefore, according to the information recording medium of the present invention, since there are no bubbles in the resin layer, it is possible to avoid the occurrence of a recording / reproducing error due to the presence of the bubbles.

  In addition, according to the method for manufacturing the information recording medium according to the present invention, by applying the same kind of resin material as the first and second resin materials, the layer formed of the first resin material and the second resin material are applied. It is possible to avoid a situation in which an optically recognizable interface (interface that may impede transmission of a laser beam irradiated during recording / reproduction) exists between the layer formed of the resin material. Thereby, the resin layer which does not change a refractive index largely between the layer formed with the 1st resin material and the layer formed with the 2nd resin material can be formed. In addition, unlike the manufacturing method using the first resin material and the second resin material separately, by supplying a single type of resin material from one dispenser to one nozzle, the first and second resin materials are supplied. Both coating processes can be performed. Therefore, since the dispenser and nozzle for the first coating process can be used as the dispenser and nozzle for the second coating process, an increase in manufacturing cost can be avoided.

  Furthermore, according to the method for manufacturing the information recording medium according to the present invention, the first resin material is applied so that the thickness is in the range of 0.1 μm or more and 20 μm or less. Even if bubbles are included when the resin material is dropped, bubbles having a size of 1 μm or more that may cause a recording / reproducing error naturally escape from the first resin material and hardly exist in the coating film. It becomes. Therefore, it is possible to avoid the occurrence of a recording / reproducing error due to the presence of bubbles.

  Further, according to the method for manufacturing the information recording medium according to the present invention, after dropping the second resin material on the applied first resin material, the stamper is overlaid on the support base material, and the support is performed in that state. By applying the second resin material by spreading it between the base material and the stamper, a conventional general manufacturing method can also form a resin layer in which bubbles are easily trapped between the stamper and the base material. Since the resin material can sometimes be applied without generating bubbles, an information recording medium can be manufactured without generating bubbles in the resin layer.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an information recording medium manufacturing method and an information recording medium according to the present invention will be described with reference to the accompanying drawings.

  First, the configuration of the optical recording medium 1 and the configuration of the manufacturing apparatus 11 that manufactures the optical recording medium 1 will be described with reference to the drawings.

  The optical recording medium 1 corresponds to an information recording medium according to the present invention, and is an example of a multilayer optical recording medium having two recording layers, an L0 recording layer 3 and an L1 recording layer 5, as shown in FIG. 2 is manufactured by the manufacturing apparatus 11 shown in FIG. Further, as shown in FIG. 1, the optical recording medium 1 includes an L0 recording layer 3, a spacer layer 4, an L1 recording layer 5 and a light transmission layer 6 formed in this order on a disk substrate 2 to transmit light. The recording data can be recorded and reproduced by irradiating one of the recording layers 3 and 5 with a laser beam from the layer 6 side. The disk substrate 2 corresponds to the support substrate in the present invention, and is formed into a disk shape (flat plate shape) having an overall diameter of about 120 mm by injection molding. In addition, a central hole 2a having a diameter of about 15 mm is formed at the center of the disk substrate 2 for positioning with respect to the turntable 21 (see FIG. 4) when the spacer layer 4 and the light transmission layer 6 are formed. . In this case, the center hole 2a constitutes a part of the mounting center hole 1a for mounting the optical recording medium 1 on the recording / reproducing apparatus in the completed optical recording medium 1. Further, a concave / convex pattern such as grooves and lands for the L0 recording layer 3 is formed on the surface (the upper surface in the figure) of the disk substrate 2 at the time of injection molding. The L0 recording layer 3 corresponds to the information recording layer in the present invention. For example, the L0 recording layer 3 is formed by sequentially forming a reflective film, a phase change film, a protective film, and the like on the disk substrate 2 by a sputtering method. .

  The spacer layer 4 is an example of a resin layer in the present invention, and a resin layer 4a formed so as to cover the L0 recording layer 3 on the disk substrate 2 and a resin layer formed on the resin layer 4a. As an example, the two resin layers 4b have a thickness T of about 25 μm. In this case, the resin layer 4a is coated with a resin material 4R having optical transparency (first resin material in the present invention: see FIG. 5), so that the thickness Ta is within a range of 0.1 μm to 20 μm ( As an example, it is formed so that the thickness at the time of application is 5 μm. In addition, the resin layer 4b is coated with a resin material 4R having light transmittance (second resin material in the present invention: see FIG. 8) so that the thickness Tb of the resin layer 4b is about 25 μm in total with the thickness of the resin layer 4a. Is formed. As will be described later, the resin material 4R for forming the resin layer 4a and the resin material 4R for forming the resin layer 4b are supplied from the same dispenser 23 (see FIG. 2). Therefore, in practice, there is almost no optically recognizable interface between the resin layers 4a and 4b (interface that may impede transmission of the laser beam irradiated during recording / reproduction). Further, an uneven pattern such as a groove and land for the L1 recording layer 5 is formed on the surface of the spacer layer 4 (the surface of the resin layer 4b). For example, the L1 recording layer 5 is formed by sequentially forming a phase change film, a protective film, and the like on the spacer layer 4 by a sputtering method. The light transmission layer 6 is a resin layer having a function as a cover layer for avoiding scratches on the L1 recording layer 5 and the like, and also having a function as an optical path for transmitting a laser beam. It is formed so that the thickness may be about 75 μm by applying a resin material having a thickness of about 75 μm.

  On the other hand, the manufacturing apparatus 11 is an apparatus for manufacturing the optical recording medium 1 according to the information recording medium manufacturing method of the present invention, and includes a recording layer forming apparatus 12 and a resin layer forming apparatus 13 as shown in FIG. ing. The recording layer forming apparatus 12 is a so-called sputtering apparatus, and forms various films on the spacer layer 4 while forming the L0 recording layer 3 by sputtering various materials on the disk substrate 2 to form a thin film. The L1 recording layer 5 is formed by sputtering to form a thin film. The resin layer forming apparatus 13 is an apparatus for forming the spacer layer 4 by applying the resin material 4R on the L0 recording layer 3 and forming the light transmitting layer 6 by applying the resin material on the L1 recording layer 5. The turntable 21, the motor 22, the dispenser 23, the nozzle 24, the vertical movement mechanism 25, the ultraviolet irradiation unit 26, and the control unit 27 are provided.

  As shown in FIG. 4, the turntable 21 includes a base 21 a having a flat upper surface on which the disk base material 2 can be placed, and a center pin 21 b erected at the center of the upper surface of the base 21 a. I have. In this case, the center pin 21b is formed in a cylindrical shape with silicon rubber as an example. The center pin 21b is expanded or contracted by an air pump (not shown) to hold the disk base 2 while positioning the disk base 2a with respect to the base 21a, and at the time of dropping the resin material 4R onto the disk base 2. The hole 2a is closed.

  The motor 22 rotates the turntable 21 under the control of the control unit 27. The dispenser 23 supplies the resin material 4 </ b> R for forming the spacer layer 4 to the nozzle 24 under the control of the control unit 27, and drops the resin material 4 </ b> R on the disk substrate 2. In this case, the nozzle 24 is moved between the retracted position and the drip processing position on the disk substrate 2 by a moving mechanism (not shown). The vertical movement mechanism 25 superimposes the stamper 10 (see FIG. 7) on the disk base 2 under the control of the control unit 27. In this case, the stamper 10 is provided with a concavo-convex pattern for forming a concavo-convex pattern such as a groove and land for the L1 recording layer 5 on its surface (lower surface in the figure), and as shown in FIG. A center hole 10a through which the center pin 21b of the table 21 can be inserted is formed. In addition, the stamper 10 is formed of a light-transmitting resin (for example, an amorphous cyclic polyolefin resin) that can transmit the ultraviolet rays 26a emitted by the ultraviolet irradiation unit 26 when the resin material 4R is cured as will be described later. In addition, the surface of the concavo-convex pattern is subjected to water repellent treatment such as fluorine treatment or silicon treatment.

  The ultraviolet irradiation unit 26 cures the resin material 4R between the disk substrate 2 (L0 recording layer 3) and the stamper 10 by irradiating the disk substrate 2 with ultraviolet rays 26a under the control of the control unit 27. . The control unit 27 controls the motor 22, the dispenser 23, the vertical movement mechanism 25, and the ultraviolet irradiation unit 26.

  Next, a method for manufacturing the optical recording medium 1 by the manufacturing apparatus 11 will be described with reference to the drawings.

  First, as shown in FIG. 3, the recording layer forming apparatus 12 forms the L0 recording layer 3 on the disk substrate 2 by sputtering. Next, the resin layer forming apparatus 13 applies the resin material 4R on the L0 recording layer 3 to form the spacer layer 4. Specifically, as shown in FIG. 4, first, the disk substrate 2 is placed on the base 21a so that the center pin 21b is inserted into the center hole 2a with the formation surface of the L0 recording layer 3 facing upward. Placed on. Next, the control unit 27 drives an air pump (not shown) to supply compressed air into the center pin 21b. Thereby, the disk base material 2 is adsorbed in a state of being positioned with respect to the base 21a by the center pin 21b which is supplied with the compressed air and expands. As a result, the disk substrate 2 is fixed at the work position on the turntable 21.

  Next, the control unit 27 controls the motor 22 to control the moving mechanism (not shown) while rotating the turntable 21 at a rotational speed of about 50 revolutions per minute, for example. The resin material 4R is supplied to the nozzle 24 by controlling the dispenser 23 while moving it above the central portion. Thereby, as shown in FIG. 4, the resin material 4 </ b> R is dropped onto the disk substrate 2 from the tip of the nozzle 24. Subsequently, the control unit 27 increases the rotation of the turntable 21 to a rotation speed of, for example, about 1000 rotations per minute by increasing the number of rotations of the motor 22. At this time, since the centrifugal force applied to the resin material 4R is increased, the resin material 4R is directed toward the outer edge of the disk substrate 2 on the disk substrate 2 (on the L0 recording layer 3) as shown in FIG. Can be extended. As a result, the resin material 4R is applied so as to cover the L0 recording layer 3, and a coating film of the resin material 4R having a thickness Ta of about 5 μm (a layer of the resin material 4R to be the resin layer 4a later) is formed ( Completion of the first coating treatment in the present invention). In this case, since the resin material 4R is spread without superimposing a stamper after the dropping of the resin material 4R is completed, even if a very small bubble is included in the resin material 4R at the time of dropping, the bubble Is smoothly removed from the resin material 4R and removed. At this time, since the resin material 4R is spread so that the thickness Ta after coating is about 5 μm, bubbles having a size of 1 μm or more which may hinder the transmission of the laser beam are formed on the disk substrate 2. It will be crushed (disappeared) and will not be present in the coating film of the resin material 4R.

  Subsequently, the control unit 27 rotates the turntable 21 at a rotation speed of, for example, about 50 rotations per minute by reducing the number of rotations of the motor 22, and controls the dispenser 23 to apply the resin material 4R to the nozzles 24. Supply. In response to this, the dispenser 23 supplies the resin material 4R, whereby the resin material 4R is dropped from the tip of the nozzle 24 onto the coating film as shown in FIG. At this time, since the coating film of the resin material 4R formed so as to cover the L0 recording layer 3 is maintained in a “wetting” state without being cured, it is dropped from the nozzle 24. When the resin material 4R comes into contact with the resin material 4R on the disk base material 2, the situation in which the surrounding air is entrained and air bubbles are included is avoided, and the resin material 4R is a resin material on the disk base material 2. It is dripped smoothly onto the 4R.

  Next, the control unit 27 moves the nozzle 24 to the retracted position, and then controls the vertical movement mechanism 25 to insert the center pin 21b into the center hole 10a as shown in FIG. The substrate 2 is overlapped. Subsequently, the control unit 27 increases the rotation of the turntable 21 to a rotation speed of, for example, about 1000 rotations per minute by increasing the number of rotations of the motor 22. At this time, since the centrifugal force applied to the resin material 4R increases, the resin material 4R rapidly moves between the disk base 2 and the stamper 10 toward the outer edge of the disk base 2 as shown in FIG. To be expanded. At this time, the disk substrate 2 and the stamper 10 are maintained in a state parallel to each other by the centrifugal force applied to both. As a result, a coating film of the resin material 4R having a uniform thickness Tb along the circumferential direction of the disk base material 2 (a layer of the resin material 4R that will later become the resin layer 4b) is formed (second in the present invention). Completion of the coating process).

  Next, as shown in FIG. 9, the control unit 27 controls the ultraviolet irradiation unit 26 to irradiate the disk substrate 2 with the ultraviolet rays 26 a. At this time, both the coating film of the resin material 4R on the disk base material 2 side and the coating film of the resin material 4R applied so as to cover the coating film are irradiated with ultraviolet rays that are transmitted through the stamper 10 and irradiated. Both are cured to form the spacer layer 4 composed of the resin layers 4a and 4b between the disc substrate 2 (L0 recording layer 3) and the stamper 10 (curing treatment in the present invention). Subsequently, the control unit 27 performs stop control of the motor 22 to stop the rotation of the turntable 21 and stops the air pump to release the fixation of the disk base material 2. Next, the disk substrate 2 is removed from the turntable 21, and the stamper 10 is peeled from the disk substrate 2 (spacer layer 4) as shown in FIG. Subsequently, as shown in FIG. 11, after the recording layer forming apparatus 12 forms the L1 recording layer 5 on the spacer layer 4, the resin layer forming apparatus 13 spin-coats a resin material on the L1 recording layer 5. The light transmission layer 6 is formed by curing. Thereby, as shown in FIG. 1, the optical recording medium 1 is completed.

  As described above, according to the method of manufacturing the optical recording medium 1, the resin material 4R as the first resin material in the present invention is applied so as to cover the L0 recording layer 3, and the applied resin material 4R is applied. After applying the resin material 4R as the second resin material in the present invention, the coating film of both the resin materials 4R and 4R is cured to form the spacer layer 4 composed of the resin layers 4a and 4b, thereby forming the disk base material. Unlike the manufacturing method in which the stamper is immediately overlapped and spread over the entire area of the disk substrate immediately after the resin material is dropped on the disk, the resin material 4R as the first resin material when dropped onto the disk substrate 2 Even if air bubbles are contained therein, the bubbles are smoothly removed without hindering the removal of the air bubbles from the resin material 4R. Accordingly, it is possible to avoid a situation in which bubbles are present in the resin material 4R in the very vicinity of the L0 recording layer 3. In addition, prior to curing the resin material 4R free of bubbles, the resin material 4R as the second resin material in the present invention is dropped on the coating film so that the disk base is dropped when the resin material 4R is dropped. Since the surface of the material 2 (L0 recording layer 3) has a certain level of wettability, a situation in which bubbles are included in the dropped resin material 4R can be avoided. As a result, it is possible to avoid a situation in which bubbles exist in the spacer layer 4 in the vicinity of the L0 recording layer 3. Therefore, according to this optical recording medium 1, since no bubbles are present in the spacer layer 4, it is possible to avoid the occurrence of a recording / reproducing error due to the presence of bubbles.

  In addition, according to the method for manufacturing the optical recording medium 1, by applying the same type of resin material 4R as the first and second resin materials in the present invention, the optical recording medium 1 is optically provided between the resin layer 4a and the resin layer 4b. It is possible to avoid a situation where there is a recognizable interface (interface that may impede transmission of the laser beam irradiated during recording / reproduction). Thereby, the spacer layer 4 which does not change a refractive index significantly between the resin layers 4a and 4b can be formed. Further, unlike the manufacturing method in which the resin material for forming the resin layer 4a and the resin material for forming the resin layer 4b are separately used, the resin material 4R is supplied from one dispenser 23 to one nozzle 24. The 1st and 2nd application | coating process in invention can be performed. Therefore, since the dispenser 23 and the nozzle 24 for the first application treatment can be used as the dispenser 23 and the nozzle 24 for the second application treatment, an increase in manufacturing cost can be avoided.

  Furthermore, according to the method for manufacturing the optical recording medium 1, the resin material 4R is dropped onto the disk substrate 2 by applying the resin material 4R so that the thickness Ta is in the range of 0.1 μm to 20 μm. Even if bubbles are included, bubbles having a size of 1 μm or more that may cause a recording / reproducing error naturally come out of the resin material 4R and hardly exist in the coating film. Therefore, it is possible to avoid the occurrence of a recording / reproducing error due to the presence of bubbles.

  Further, according to the method for manufacturing the optical recording medium 1, the stamper 10 is overlaid on the disk substrate 2 in a state where the resin material 4R as the second resin material is dropped on the applied resin material 4R. In this state, the resin material 4R as the second resin material is applied on the resin material 4R as the first resin material by spreading the resin material 4R between the disk base 2 and the stamper 10. Thus, in the conventional general manufacturing method, the resin layer 4R can be applied to the spacer layer 4 in which bubbles are easily confined between the stamper and the base material without generating bubbles at the time of formation. The optical recording medium 1 can be manufactured without generating bubbles therein.

  In addition, this invention is not limited to said method and structure, It can change suitably. For example, the disk substrate 2 is not limited to a disk shape, and various shapes of substrates can be used. Moreover, in said manufacturing apparatus 11, it is the same as 1st resin material (resin material applied first to the disk base material 2) and 2nd resin material (resin material applied 2nd) in this invention. Although the same kind of resin material 4R is supplied from the dispenser 23 and applied, the present invention is not limited to this, and the resin material applied second is a resin material different from the resin material applied first. Can also be used. In this case, by using a resin material having a lower viscosity than the resin material applied first as the resin material applied second, it is possible to suitably avoid occurrence of bubbles when the resin material is dropped. The first resin material application method in the present invention is not limited to the spin coating of the resin material, and the resin material 4R can be applied (transferred) so as to cover the L0 recording layer 3 by, for example, pad printing. .

  Moreover, the object to be formed according to the manufacturing method according to the present invention is not limited to the spacer layer 4, and the light transmission layer 6 can also be the object. In this case, after applying the first resin material of the present invention so as to cover the L1 recording layer 5 and having a thickness in the range of 0.1 μm to 20 μm (as an example, the thickness at the time of dropping is 10 μm). Prior to curing the resin material, the second resin material in the present invention is dropped, and the rotational speed and processing time are adjusted appropriately so that the thickness of both resin material layers is about 100 μm after spreading. Then, the second resin material is applied on the first resin material, and then both the resin materials are cured together to form the light transmission layer 6. In addition, in the manufacturing apparatus 11 described above, the ultraviolet curable resin material 4R is used when forming the spacer layer 4. However, the present invention is not limited to this, and a heat ray curable resin material or an electron beam curable resin material is used. Various resin materials such as these resin materials can be employed.

It is sectional drawing of the optical recording medium 1 manufactured according to the manufacturing method of the information recording medium based on this invention. 1 is a block diagram illustrating a configuration of a manufacturing apparatus 11 that manufactures an optical recording medium 1. FIG. 3 is a cross-sectional view of a state in which an L0 recording layer 3 is formed on a disk substrate 2. FIG. 4 is a cross-sectional view of a state in which a resin material 4R for forming a resin layer 4a is dropped on a disk substrate 2. FIG. FIG. 5 is a cross-sectional view of a state in which the resin material 4R in the state shown in FIG. It is sectional drawing of the state which dripped the resin material 4R for forming the resin layer 4b on the disk base material 2 (coating film of the resin material 4R) in the state of FIG. FIG. 7 is a cross-sectional view when the stamper 10 is overlaid on the disk substrate 2 in the state of FIG. 6. 4 is a side cross-sectional view of a state in which a resin material 4R between the disk base 2 and the stamper 10 is extended to the outer edge of the disk base 2. FIG. FIG. 9 is a cross-sectional view of a state in which the coating film of both spacer layers 4 in the state shown in FIG. It is sectional drawing of the state which has peeled the stamper 10 from the disk base material 2 (spacer layer 4). 3 is a cross-sectional view of a state where an L1 recording layer 5 is formed on a spacer layer 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical recording medium 2 Disc base material 3 L0 recording layer 4 Spacer layer 4a, 4b Resin layer 4R Resin material 5 L1 Recording layer 6 Light transmission layer 10 Stamper 11 Manufacturing apparatus 12 Recording layer forming apparatus 13 Resin layer forming apparatus 21 Turntable 22 Motor 23 Dispenser 24 Nozzle 25 Vertical movement mechanism 26 Ultraviolet irradiation unit 27 Control unit T, Ta, Tb Thickness

Claims (5)

When manufacturing an information recording medium by forming a resin layer on the information recording layer by applying and curing a resin material so as to cover the information recording layer formed on the support substrate,
A first application process for applying a first resin material so as to cover the information recording layer, and a second application process for applying a second resin material on the applied first resin material After performing in this order, the manufacturing method of the information recording medium which performs the hardening process which hardens both the said 1st and 2nd resin material, and forms the said resin layer.   The method of manufacturing an information recording medium according to claim 1, wherein the same kind of resin material is applied as the first and second resin materials.   3. The method of manufacturing an information recording medium according to claim 1, wherein the first resin material is applied so that a thickness is in a range of 0.1 μm to 20 μm during the first application treatment.   As said 2nd application | coating process, after dripping the said 2nd resin material on the said apply | coated 1st resin material, a stamper is piled up on the said support base material, In the state, the said support base material and the said 4. The method of manufacturing an information recording medium according to claim 1, wherein the second resin material is applied by spreading between the stamper and the stamper. A support base, an information recording layer formed on the support base, and a resin layer formed so as to cover the information recording layer,
The resin layer is formed by curing both the first and second resin materials in a state where the second resin material is applied on the first resin material applied so as to cover the information recording layer. Information recording media.

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