WO2014050609A1 - 不規則な凹凸表面を有する基板を検査する装置及びそれを用いた検査方法 - Google Patents
不規則な凹凸表面を有する基板を検査する装置及びそれを用いた検査方法 Download PDFInfo
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- WO2014050609A1 WO2014050609A1 PCT/JP2013/074827 JP2013074827W WO2014050609A1 WO 2014050609 A1 WO2014050609 A1 WO 2014050609A1 JP 2013074827 W JP2013074827 W JP 2013074827W WO 2014050609 A1 WO2014050609 A1 WO 2014050609A1
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Classifications
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/70—Testing, e.g. accelerated lifetime tests
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/062—LED's
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/854—Arrangements for extracting light from the devices comprising scattering means
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/40—Thermal treatment, e.g. annealing in the presence of a solvent vapour
- H10K71/441—Thermal treatment, e.g. annealing in the presence of a solvent vapour in the presence of solvent vapors, e.g. solvent vapour annealing
Definitions
- the present invention relates to a substrate inspection apparatus having irregular irregularities used for manufacturing organic electroluminescent elements and the like and an inspection method using the same.
- Organic electroluminescent elements (or organic light emitting diodes, hereinafter referred to as “organic EL elements”) are known as self-luminous display elements.
- Organic EL elements have higher visibility than liquid crystal elements and can be reduced in weight because a backlight is unnecessary. For this reason, research and development have been actively conducted as next-generation display elements.
- the present applicant applies a solution obtained by dissolving a block copolymer satisfying a predetermined condition in a solvent onto a base material, and dries it to form a microphase separation structure of the block copolymer.
- a method for obtaining a matrix (metal substrate) on which a fine and irregular concavo-convex pattern is formed is disclosed.
- a matrix used for nanoimprinting or the like can be obtained by using the phenomenon of block copolymer self-organization.
- a mixed solution of a silicone polymer and a curing agent is dropped onto the obtained master mold and cured to obtain a transfer pattern, and then a glass substrate coated with a curable resin is pressed against the transfer pattern to apply a curable resin by ultraviolet rays.
- a diffraction grating in which the transfer pattern is duplicated is produced.
- the organic EL element obtained by laminating a transparent electrode, an organic layer, and a metal electrode on this diffraction grating has a sufficiently high emission efficiency and a sufficiently high external extraction efficiency, but also has a light emission wavelength. It has been confirmed that the dependence and directivity are sufficiently low and the power efficiency is sufficiently high.
- the organic EL element using the diffraction grating manufactured in Patent Document 2 as described above is used as a display device or a lighting device such as a mobile phone or a TV screen, the luminance is uniform from the entire display surface. It is desirable to irradiate with light. In addition, it is necessary to prevent the occurrence of pattern defects that cause light intensity in a minute portion of the display surface. For this reason, after the completion of the organic EL element, it is necessary to confirm that the irradiation from the organic EL element is uniform, that is, that the luminance unevenness is within an allowable range and that the light and darkness of the minute portion is not generated.
- the organic EL element becomes defective, and the multilayer stacking process on the diffraction grating as described above is useless. End up.
- the lamination of transparent electrodes, organic layers, metal electrodes, and the like is a manufacturing cost and laborious process, which can reduce such defective products, improve yield, and reduce waste of materials and manufacturing costs. There is a strong demand.
- an object of the present invention is to provide an inspection apparatus and an inspection method capable of inspecting both luminance unevenness and local pattern defects of a substrate having an irregular uneven surface efficiently and at low cost.
- Another object of the present invention is to eliminate both luminance unevenness and pattern defects of a light transmissive substrate and a light non-transmissive substrate obtained when a substrate having an irregular uneven surface is produced through a transfer process.
- An object of the present invention is to provide an inspection apparatus and an inspection method that can be inspected.
- an apparatus for inspecting a substrate having an irregular uneven surface that scatters light A first irradiation system for irradiating the substrate with first detection light; A first detection system for detecting luminance unevenness from the entire uneven surface of the substrate irradiated with the first detection light; A second irradiation system for irradiating the substrate with second detection light having a wavelength different from that of the first detection light; There is provided a substrate inspection apparatus comprising: a second detection system configured to detect a defect on the uneven surface of the substrate irradiated with the second detection light.
- the first detection light may be blue light
- the second detection light may be white light
- the first irradiation system may include transmitted light illumination for illuminating the light transmissive substrate and non-transmissive light illumination for illuminating the light non-transmissive substrate
- the second irradiation system may include transmitted light illumination for illuminating the light transmissive substrate and non-transmissive light illumination for illuminating the light non-transmissive substrate.
- the non-transmission light illumination of the first irradiation system and the non-transmission light illumination of the second irradiation system may illuminate an irregular uneven surface of the substrate
- the transmission light illumination of the first irradiation system and The transmitted light illumination of the second irradiation system may illuminate the irregular uneven surface of the substrate from the surface opposite to the irregular uneven surface of the substrate.
- the first detection system is illuminated by light from the light transmissive substrate illuminated by the transmitted light illumination of the first irradiation system and non-transmissive light illumination of the first irradiation system.
- You may provide the camera which detects the light from the made light-impermeable board
- the second detection system is light transmitted from the light-transmissive substrate illuminated by the transmitted light illumination of the second irradiation system, and the light non-transmissive light illuminated by the non-transmissive light illumination of the second irradiation system.
- a camera for detecting light from the conductive substrate may be provided. The resolution of the second detection system camera may be higher than the resolution of the first detection system camera.
- the camera of the second detection system may include a plurality of cameras that respectively detect divided areas of the substrate.
- the first irradiation system and the second irradiation system may be line-shaped illumination, and further, the substrate transport is performed to transport the substrate in a direction orthogonal to the extending direction of the line-shaped illumination.
- a system may be provided.
- the substrate inspection apparatus may further include a control system that controls the substrate transport system, the first irradiation system, the second irradiation system, the first detection system, and the second detection system.
- the system detects defects on the uneven surface when the substrate is moving in one direction with respect to the first irradiation system, the second irradiation system, the first detection system, and the second detection system by the substrate transport system. And detecting luminance unevenness when moving in a direction opposite to the one direction with respect to the first irradiation system, the second irradiation system, the first detection system, and the second detection system. it can.
- the control system can determine whether or not the defects on the uneven surface and the luminance unevenness are within a predetermined allowable range.
- an inspection method for inspecting a light non-transparent substrate having an irregular uneven surface that scatters light and a light transmissive substrate having an irregular uneven surface that scatters light There, Transporting the substrate to a first detection system that detects luminance unevenness from the entire uneven surface of the substrate and a second irradiation system that detects defects on the uneven surface of the substrate; When the light-impermeable substrate has been transported, the first detection light is applied to the uneven surface of the substrate, the light from the uneven surface is detected by the first detection system, and the first detection light And irradiating the uneven surface of the substrate with second detection light having a different wavelength, and detecting light from the uneven surface by the second detection system, When the light-transmitting substrate is conveyed, the irregular surface of the substrate is irradiated with the first detection light from the surface opposite to the uneven surface of the light-transmitting substrate. From the opposite surface of the light-transmitting substrate and irradiating the irregular uneven surface of
- the first detection light may be blue light
- the second detection light may be white light
- both the first irradiation system and the second irradiation system may be line illumination extending in a predetermined direction, and the substrate is orthogonal to the extending direction of the line illumination. It may be conveyed in the direction.
- a defect on the uneven surface of the substrate may be detected when moving in one direction with respect to the first detection system and the second detection system.
- the luminance unevenness may be detected when moving in the direction opposite to the one direction with respect to the second detection system.
- it may further include determining whether the irregularities on the uneven surface and the luminance unevenness are within a predetermined allowable range.
- a method of manufacturing a substrate having an irregular surface that scatters light, Producing a substrate having the irregular uneven surface There is provided a substrate manufacturing method including inspecting a substrate having the irregular concavo-convex surface by using the substrate inspection method according to the first aspect of the present invention.
- the production of the substrate having the irregular concavo-convex surface produces a light non-transparent substrate having an irregular concavo-convex pattern, and the light non-transparent substrate is irregular. It may include transferring the concavo-convex pattern.
- the production of the substrate having the irregular concavo-convex surface may include utilizing phase separation of the block copolymer.
- the irregular uneven surface may be formed of a metal, a resin, or a sol-gel material.
- a method for manufacturing an organic EL element wherein a diffraction grating substrate having a concavo-convex surface is prepared using the method for manufacturing a substrate according to the fourth aspect of the present invention, and the diffraction Provided is a method for manufacturing an organic EL element, wherein a transparent electrode, an organic layer, and a metal electrode are sequentially laminated on an uneven surface of a lattice substrate to manufacture an organic EL element.
- the luminance unevenness within the predetermined range and the predetermined The transparent electrode, the organic layer, and the metal electrode may be sequentially laminated on the concavo-convex surface of the diffraction grating substrate having defects within an allowable range to produce an organic EL element.
- the substrate inspection apparatus and the inspection method of the present invention it is possible to efficiently inspect luminance unevenness and pattern defects of a substrate having an irregular rugged surface used for an element such as an organic EL element, and to efficiently perform such a substrate. Can be manufactured well.
- the method for producing an organic EL element of the present invention it is possible to produce an organic EL element with high throughput by associating the characteristics of luminance unevenness between the organic EL element and a substrate having an irregular uneven surface used for the organic EL element. In particular, it is possible to predict the brightness unevenness and pattern defect occurrence of the finished product and evaluate the finished product at the manufacturing stage of the substrate, so that uniform illuminance can be obtained by using a substrate that has passed the determination of the brightness unevenness and the pattern defect.
- the organic EL element which has can be manufactured more reliably.
- the illuminance uniformity (brightness unevenness) of the organic EL element is defective, or when local light emission or dimming occurs, whether the defect generation stage is the substrate formation stage or the element itself formation stage. As you can see, you can respond quickly to such a situation.
- FIG. 2A and 2B are schematic views of a substrate inspection apparatus according to the present invention, in which FIG. 2A is a schematic side view, and FIG. 2B is a schematic cross-sectional view as seen from the IB-IB direction of FIG.
- FIG. 3A is a conceptual diagram showing a state in which a light-transmitting substrate is inspected using the macro transmission illumination
- FIG. 3B is a light non-transmission using the macro non-transmission illumination.
- FIG. 4 shows an arrangement of a substrate, a macro camera, and a micro camera that are inspection targets as viewed from above the inspection apparatus.
- FIG. 5 (a) shows a micro test
- FIG.5 (b) shows a macro test
- . 6A to 6D are diagrams conceptually showing a substrate manufacturing process by the BCP method, and conceptually showing a process of obtaining a mountain structure through the first heating step, the etching step, and the second heating step.
- FIG. FIG. 7A is a diagram conceptually showing a process for obtaining a corrugated structure by a BCP method through a solvent annealing step
- FIG. 7A shows a corrugated structure in which a cylindrical arrangement is a single layer
- FIG. 7B is a cylindrical arrangement. Shows a corrugated structure having a plurality of layers.
- FIGS. 8A to 8D are diagrams conceptually showing a process for producing a metal substrate having an uneven structure by electroforming.
- 9A to 9E are diagrams conceptually showing a process for producing a diffraction grating from a metal substrate having a concavo-convex structure.
- 10 (a) to 10 (d) are diagrams conceptually showing a manufacturing process of the concavo-convex structure by the BKL method. It is a figure which shows the cross-section of an organic EL element.
- FIGS. 13A to 13C are diagrams conceptually showing a procedure of a micro inspection process for performing micro inspection at a high resolution in the modified embodiment of the present invention.
- the inspection apparatus and the inspection method of the present invention detect luminance unevenness and uneven pattern defects of a substrate having an irregular uneven surface.
- a substrate having an irregular surface means a substrate in which the uneven pattern formed on the substrate is not regular, particularly a substrate in which the uneven pitch is not uniform and the direction of the unevenness is not directional. Means. Light scattered and / or diffracted from such a substrate has a relatively broad wavelength band rather than a single or narrow band wavelength, and the scattered and / or diffracted light is directional. There is no, going in all directions.
- a Fourier transform image obtained by performing a two-dimensional fast Fourier transform process on an unevenness analysis image obtained by analyzing the shape of the surface unevenness is circular or annular.
- a quasi-periodic structure having a pitch distribution of the concaves and convexes is included although the pattern has a directivity in the direction of the concaves and convexes. Therefore, a substrate having such a quasi-periodic structure is suitable for a diffraction substrate used for a surface light-emitting element such as an organic EL element as long as the uneven pitch distribution diffracts visible light.
- a substrate in which all the recording tracks (grooves) found in an optical recording medium or a magnetic recording medium are arranged in the same direction and at the same pitch is referred to as “irregular uneven surface” in this application. It does not fall under “having a substrate”. Details of the manufacturing process of the substrate having an irregular uneven surface will be described later.
- the substrate having an irregular uneven surface is inspected for luminance unevenness and minute defects (pattern defects, foreign matter, scratches, etc.) on the surface of the substrate according to the inspection process described later (S2). Further, based on the inspection result, it is determined according to a determination step described later whether the substrate has a uniform luminance distribution or is in a range in which minute defects are allowed (S3). If the substrate has a uniform luminance distribution and the detected minute defects are in an acceptable range, the substrate is regarded as a finished product, and the substrate is used in a subsequent process such as manufacturing an organic EL (S4). ). If it is determined that the substrate does not have a uniform luminance distribution or is within or outside the allowable range of minute defects, post-processing is performed according to a post-processing step described later (S5).
- S5 post-processing step described later
- the inspection apparatus 102 shown in FIG. 2 (a) mainly includes a transport system 108 that transports the substrate P from the upstream side to the downstream side in the transport direction (arrow Y in the figure), a macro inspection unit 104, and a macro.
- the micro inspection part 106 provided in the downstream rather than the inspection part 104 and those control parts 111 are provided.
- the transport direction of the inspection apparatus 102 is defined as the Y direction
- the direction parallel to the substrate surface and orthogonal to the transport direction is defined as the X direction
- the height direction perpendicular to the substrate surface is defined as the Z direction.
- the transport system 108 is a conveyor in which a plurality of rollers 108a are arranged in the transport direction, and some of the rollers 108a are drive rollers connected to a rotational drive source (not shown). 108a is moved from the upstream side to the downstream side in the transport direction.
- a macro inspection position MA and a micro inspection position MI are present at substantially the center of the transport system 108 in the transport direction. Note that the method of transporting the substrate is not limited to transport by rollers, but may be transport by a linear motor or the like.
- the macro inspection unit 104 is a unit that inspects the luminance unevenness of the entire surface of the substrate P that has been transported by the transport system 108.
- the macro transmitted light illumination 114 and the macro light are used as a macro illumination system (first irradiation system).
- the apparatus mainly includes reflected light (non-transmitted light) illumination 116 and a macro camera 112 as a macro detection system (first detection system).
- the macro detection system uses a region having an area of 0.1 mm 2 or more as a detection target.
- Macro transmitted light illumination 114 is illumination used for inspecting a light transmissive substrate, and is provided below the transport system 108.
- the macro transmitted light illumination 114 is a blue LED line illumination in which a plurality of blue LEDs emitting light having a wavelength of 400 to 500 nm (first detection light) are embedded in a frame in an X-direction array. It is used here.
- the blue LED line-shaped illumination there is an advantage that i) the observation range can be illuminated uniformly, ii) unevenness appears clearly, and iii) the influence of foreign matter is less likely to occur.
- the macro transmitted light illumination 114 is preferably a blue LED line illumination regardless of whether the substrate material is a film, glass, or metal.
- the macro transmitted light illumination 114 is mounted on the support 114b so as to be rotatable about the rotation shaft 114a so that the incident angle of the illumination light with respect to (a part of) the substrate P existing at the inspection position MA can be adjusted. Yes. As shown in FIG. 3A, the transmitted light illumination for macro 114 irradiates the back surface of the substrate P existing at the inspection position MA, that is, the surface on which the concavo-convex structure is not formed, to the inside of the substrate P. The incident light is scattered and diffracted by the uneven pattern on the surface of the substrate P.
- the macro camera 112 may be any image sensor as long as it can receive scattered and diffracted light at the inspection position MA, and a line for continuously capturing a one-dimensional image when the substrate P passes through the inspection position MA.
- a sensor camera is preferably used.
- the line sensor camera By using the line sensor camera, the scattered and diffracted light from the substrate P can always be imaged from the same angle.
- the number of pixels in the image sensor is preferably at least 30 or more. For example, an 80 ⁇ m / pixel CCD camera can be used.
- the macro camera 112 is generally disposed at a position where it can receive the first-order diffracted light from the uneven pattern present at the inspection position MA.
- the macro camera 112 is attached to the moving stage 112a via an arm 112b having a rotation axis.
- the moving stage 112a can slide on the stage base 112c, and can move the macro camera 112 in the X direction and the optical axis direction of the macro camera 112. Further, the angle of the optical axis (light receiving angle) of the macro camera 112 can be changed by the rotation axis of the arm 112b. Note that when there are a plurality of macro cameras 112, not only the effects of sensitivity error and focus adjustment between the cameras appear, but also it is necessary to synthesize data between the cameras, and the data processing becomes complicated. It is desirable to inspect with.
- the macro non-transmissive light illumination 116 is illumination used for inspecting the non-transmissive substrate, and is provided on the support stand 130 above the transport system 108 and above the inspection position MA.
- line-shaped illumination in which LEDs emitting light having a wavelength of 400 to 500 nm are embedded in an array in the X direction is used as the macro non-transmissive illumination 116.
- the macro non-transparent light illumination 116 is slidably provided on the guide 116a so that the position and angle at which the light is irradiated can be adjusted. As shown in FIG.
- the non-transparent light illumination 116 for macro irradiates the surface of the substrate P existing at the macro inspection position MA, that is, the surface on which the concavo-convex pattern is formed. It is scattered and diffracted by the reflected light from the surface, that is, the uneven structure on the surface of the substrate P. Scattered light and diffracted light from the uneven structure are received by the macro camera 112. In this way, the macro inspection unit 104 can inspect any substrate by using different illumination systems, regardless of whether the substrate being transported is light transmissive or non-transmissive.
- the macro inspection unit 104 uses two illumination systems and a macro camera common to the two illumination systems, so that the macro inspection of both the light transmissive substrate and the light non-transmissive substrate with a simple structure, that is, luminance unevenness. Inspection is possible.
- the micro-inspection unit 106 is a unit that inspects pattern defects of the substrate P conveyed by the conveyance system 108, that is, minute defects of the concavo-convex structure forming the pattern, foreign matter adhering to the substrate P, scratches derived from the process, etc. It is.
- the micro inspection unit 106 includes a micro transmitted light illumination 124 and a micro non-transmitted light illumination 126 as a micro illumination system (second irradiation system), and a micro camera 122 as a micro detection system (second detection system). Is provided. As shown in FIG. 2B, four micro cameras 122 are arranged in the X direction.
- the micro detection system uses a region having an area of 1 ⁇ m 2 to 25 mm 2 as a detection target.
- the micro transmitted light illumination 124 is an illumination used for inspecting a light transmissive substrate, and is provided below the transport system 108.
- the micro transmitted light illumination 124 is a line illumination in which LEDs that emit light having a wavelength of 400 to 800 nm (second detection light) are embedded in a frame in an X-direction array.
- high-intensity white line illumination is preferable in order to obtain a sufficient amount of light and perform high-precision inspection.
- the micro transmitted light illumination 124 is mounted on the support base 124b so as to be rotatable about the rotation shaft 124a so that the incident angle of the illumination light with respect to the micro inspection position MI and the substrate P can be adjusted.
- the micro transmitted light illumination 124 irradiates the back surface of the substrate P, that is, the surface on which the concavo-convex structure is not formed.
- the light incident on the substrate is scattered and diffracted by the uneven pattern on the surface of the substrate P.
- the illumination light is incident at an incident angle of 20 ° to 60 ° with respect to the normal line of the substrate from the side where the unevenness of the substrate does not exist.
- the incident angle is the same for the non-transmissive illumination for micro and the non-transmissive illumination for macro.
- the micro camera 122 installed downstream of the transmitted light illumination 124 in the transport direction and above the transport system 108.
- the micro camera detects a relatively narrow range with high resolution. Therefore, the pixel size is preferably 1 ⁇ m to 50 ⁇ m. If the thickness is less than 1 ⁇ m, a clear image cannot be obtained due to insufficient light amount, or the depth of focus becomes shallow, and the image is blurred due to a slight swell or vibration during conveyance. If it exceeds 50 ⁇ m, there is a possibility that minute defects cannot be detected.
- a CCD camera adjusted to 15 ⁇ m / pixel can be used.
- the micro camera 122 is generally disposed at a position where it can receive the first-order diffracted light from the concavo-convex pattern.
- the micro camera 122 is attached to the moving stage 122a via an arm 122b having a rotation axis.
- the moving stage 122a can move the micro camera 122 in the X direction and the optical axis direction of the micro camera 122 by sliding on the stage base 122c. Further, the inclination (light receiving angle) of the optical axis of the micro camera 122 can be changed by the rotation axis of the arm 122b.
- the non-transmissive light illumination 126 for micro is illumination used for inspecting the non-transmissive substrate, and is provided on the support stand 130 above the transport system 108 and above the inspection position MI.
- the non-transmission light illumination 126 for micro is a line illumination in which LEDs emitting light having a wavelength of 400 to 800 nm are embedded in an array in the X direction.
- the non-transmission light illumination 126 for micro is slidably provided on the guide 126a so that the position and angle at which light is irradiated can be adjusted.
- the micro non-transmissive light illumination 126 irradiates the surface of the substrate P, that is, the surface on which the concavo-convex pattern is formed. It is scattered and diffracted by the uneven structure on the surface of P. Scattered and diffracted light (reflected light) from the concavo-convex structure is received by the micro camera 122.
- the cameras of the micro inspection unit 106 and the macro inspection unit 104 are preferably installed on the uneven surface side of the substrate, and the imaging direction is generally a position where the first-order diffracted light from the uneven pattern can be received, that is, The angle is preferably 40 to 80 ° from the normal direction of the substrate.
- the angle is preferably 40 to 80 ° from the normal direction of the substrate.
- the micro inspection unit 106 can inspect micro defects on any substrate by using different illumination systems regardless of whether the substrate to be transported is light transmissive or non-transmissive.
- the micro inspection unit 106 uses two illumination systems and a micro camera common to both, so that both the light transmissive substrate and the light non-transparent substrate are simple in structure. It is possible to inspect defects.
- a drive system 132a is provided. The marker 132 can use an inkjet head or magic ink.
- FIG. 4 shows the arrangement of the light non-transparent substrate P, the macro camera 112, and the micro camera 122, which are inspection targets when viewed from above the inspection apparatus 102.
- a micro defect is first inspected by the micro inspection unit 106.
- the control system 111 turns on the non-transmissive light illumination 126 for micro (see FIG. 2A) and controls the transport system 108 to transport the substrate P in the + Y direction toward the micro detection position MI.
- the transport system 108 controls the transport system 108 to transport the substrate P in the + Y direction toward the micro detection position MI.
- the intensity of the received light is input to the control system 111 together with the coordinate position in the transport direction of the substrate P.
- the control system 111 includes an image processing unit 111a, in which the light intensity received from the micro inspection position MI by the four micro cameras 122 is associated with each coordinate position (X coordinate position and Y coordinate position) on the substrate P.
- a micro inspection image representing the light intensity of the entire substrate P is synthesized by the image processing unit 111a. Note that the pixel position of the micro camera 122, the transport direction (Y direction) of the substrate P, and the position in the X direction orthogonal thereto are associated in advance.
- the control system 111 turns off the non-transmissive light illumination 126 for micros, turns on the non-transmissive light illumination 116 for macros, and turns the transport system 108 on.
- the substrate P is moved in the direction opposite to the transport direction ( ⁇ Y direction), that is, the return path of the movement path of the micro inspection.
- ⁇ Y direction transport direction
- scattered light from the surface of the substrate P is received by the macro camera 112.
- the resolution of the macro camera 112 is lower than that of the micro camera.
- one camera can detect scattered light over the entire X direction of the substrate.
- the intensity of the received light is input to the control system 111 together with the coordinate position in the transport direction of the substrate P.
- the image processing unit 111a of the control system 111 receives light from the macro inspection position MA by the macro camera 112 for each coordinate position on the substrate P (a position in the transport direction (Y direction) and a direction orthogonal to the position (X direction)). Match the light intensity.
- a macro inspection image representing the light intensity of the entire substrate P is synthesized by the image processing unit 111a.
- the micro transmitted light illumination 124 is used instead of the micro non transmitted light illumination 126, and the macro non transmitted light illumination 116 is used instead. Macro transmitted light illumination 114 is used.
- a micro defect is first inspected by the micro inspection unit 106 while moving the substrate P in the transport direction as shown in FIG. That is, the control system 111 turns on the micro transmitted light illumination 124 (see FIG. 2A) and controls the transport system 108 to transport the substrate P toward the micro detection position MI in the + Y direction.
- the micro detection position MI scattered light from the surface of the substrate P is received by the four micro cameras 122.
- the intensity of the received light is input to the control system 111 together with the coordinate position in the transport direction of the substrate P.
- the image processing unit 111a of the control system 111 the light intensity received from the micro inspection position MI by the four micro cameras 122 is associated with each coordinate position (X coordinate position and Y coordinate position) on the substrate P.
- a micro inspection image representing the light intensity of the entire substrate P is synthesized by the image processing unit 111a.
- An example of the synthesized micro inspection image is shown in FIG.
- FIG. 5A is a micro inspection image obtained from a substrate having a concavo-convex pattern formed from a sol-gel material on a glass substrate described later.
- the control system 111 then turns off the micro non-transmissive light illumination 126, turns on the macro transmitted light illumination 114 instead, and controls the transport system 108 to control the substrate P. Is moved in the return path ( ⁇ Y direction) of the movement path of the micro inspection.
- the macro camera 112 receives scattered light from the surface of the substrate P. The intensity of the received light is input to the control system 111 together with the coordinate position in the transport direction of the substrate P.
- the control system 111 determines the light intensity received from the macro inspection position MA by the macro camera 112 for each coordinate position on the substrate P. Associate.
- FIG. 5B is a macro inspection image obtained from a substrate having a concavo-convex pattern formed from a sol-gel material on a glass substrate described later.
- ⁇ Judgment process> The luminance of each pixel of the micro inspection image synthesized by the image processing unit 111a in the inspection process is evaluated by the control system 111, and if there is a portion that is higher or lower than a certain luminance and has a predetermined size or more, The part is determined to be a defect, and the coordinates of the defect and the surrounding image are stored in the storage unit 111b of the control system 111. Further, the coordinates where the defect exists are sent to the marker 132, the transport system 108 and the marker driving system 132a are driven to move the marker 132 relative to the defective portion of the substrate P, and the marker 132 is moved from the back surface of the substrate to the defective portion. Mark (marking process).
- this marking step is not essential, it is useful for the purpose of specifying the position of the defective part when analyzing the defect position. Also, the brightness of each pixel of the macro inspection image synthesized by the image processing unit 111a in the inspection process is evaluated by the control system 111, and if a portion higher or lower than a certain luminance is smaller than a certain area, it is determined to be a non-defective product. If it is larger than the area, it is determined as a defective product.
- ⁇ Post-processing process> When it is determined that the luminance unevenness and the defect are within a desired range in the determination step, an organic EL element is manufactured according to a process described later using this substrate. If it is determined that the luminance unevenness or defect is outside the desired range, post-processing is performed. As post-processing, it is analyzed whether the substrate defect (luminance unevenness) is caused by dust, scratches, periodic errors, or random errors. If the deposit is caused by dust or the like, it can be repaired by applying pressurized air to the substrate surface to blow off the deposit, and then the above inspection is performed again.
- the ratio of the maximum value to the minimum value, the scattering intensity difference, or the average pixel value is within a desired range based on the inspection result.
- a step of separating out of the range can be provided.
- the organic EL elements can be sequentially manufactured by supplying them to a production line such as an organic EL element. Those outside the range can be collectively analyzed for defects and discarded.
- An inspection apparatus and an inspection method using the same according to the present invention include, for example, a light-impermeable mold for manufacturing such a light-transmitting substrate by a transfer process in the production process of the light-transmitting substrate having an uneven pattern. This is advantageous when there is a step of manufacturing a replica. That is, as described above, the inspection apparatus and inspection method of the present invention can inspect luminance unevenness and pattern defects by switching the illumination system according to the light transmission characteristics of the substrate to be inspected.
- the light-transmitting substrate having the uneven pattern but also the light-impermeable mold for manufacturing the substrate and the uneven pattern of the replica can be the inspection target.
- a manufacturing process for manufacturing a light-transmitting substrate used for an organic EL light scattering substrate will be described as an example.
- the block copolymer used for the BCP method has at least a first polymer segment composed of a first homopolymer and a second polymer segment composed of a second homopolymer different from the first homopolymer.
- the second homopolymer desirably has a solubility parameter that is 0.1 to 10 (cal / cm 3 ) 1/2 higher than the solubility parameter of the first homopolymer.
- the difference between the solubility parameters of the first and second homopolymers is less than 0.1 (cal / cm 3 ) 1/2, it is difficult to form a regular microphase separation structure of the block copolymer, and the difference is 10 When it exceeds (cal / cm 3 ) 1/2 , it is difficult to prepare a uniform solution of the block copolymer.
- Examples of the monomer that can be used as the first homopolymer and the second homopolymer as a raw material for the homopolymer include styrene, methylstyrene, propylstyrene, butylstyrene, hexylstyrene, octylstyrene, methoxystyrene, ethylene, Propylene, butene, hexene, acrylonitrile, acrylamide, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, hexyl methacrylate, octyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, hexyl acrylate, octyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, buty
- styrene methyl methacrylate, ethylene oxide, butadiene, isoprene, vinyl pyridine, and lactic acid from the viewpoint that phase-separation formation easily occurs and unevenness is easily formed by etching.
- the combination of the first homopolymer and the second homopolymer includes styrene-based polymer (more preferably polystyrene), polyalkyl methacrylate (more preferably polymethyl methacrylate), polyethylene oxide, polybutadiene, polyisoprene, and polyvinylpyridine. And two combinations selected from the group consisting of polylactic acid.
- the styrenic polymer and the poly More preferred are combinations of alkyl methacrylates, combinations of styrenic polymers and polyethylene oxide, combinations of styrenic polymers and polyisoprene, combinations of styrenic polymers and polybutadiene, combinations of styrenic polymers and polymethyl methacrylate, styrenic polymers and polyisoprene.
- the combination of styrene polymer and polybutadiene is particularly preferred. More preferably, it is a combination of polystyrene (PS) and polymethyl methacrylate (PMMA).
- the number average molecular weight (Mn) of the block copolymer is preferably 500,000 or more, more preferably 1,000,000 or more, and particularly preferably 1,000,000 to 5,000,000.
- the average pitch of the unevenness formed by the microphase separation structure of the block copolymer becomes small, and the average pitch of the unevenness of the resulting diffraction grating becomes insufficient.
- the average pitch is preferably 100 to 1500 nm.
- the number average molecular weight (Mn) is preferably 500,000 or more.
- the molecular weight distribution (Mw / Mn) of the block copolymer is preferably 1.5 or less, more preferably 1.0 to 1.35. When the molecular weight distribution exceeds 1.5, it becomes difficult to form a regular microphase separation structure of the block copolymer.
- the number average molecular weight (Mn) and the weight average molecular weight (Mw) of the block copolymer are values measured by gel permeation chromatography (GPC) and converted to the molecular weight of standard polystyrene.
- the volume ratio of the first polymer segment to the second polymer segment (first polymer segment: second polymer segment) in the block copolymer is used to create a lamellar structure by self-assembly.
- the ratio is preferably 3: 7 to 7: 3, more preferably 4: 6 to 6: 4.
- the volume ratio is out of the above range, it becomes difficult to form a concavo-convex pattern resulting from the lamellar structure.
- the block copolymer solution used for the BCP method is prepared by dissolving the block copolymer in a solvent.
- solvents include aliphatic hydrocarbons such as hexane, heptane, octane, decane, and cyclohexane; aromatic hydrocarbons such as benzene, toluene, xylene, and mesitylene; ethers such as diethyl ether, tetrahydrofuran, and dioxane.
- Ketones such as acetone, methyl ethyl ketone, isophorone and cyclohexanone; ether alcohols such as butoxyethyl ether, hexyloxyethyl alcohol, methoxy-2-propanol and benzyloxyethanol; ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triglyme, propylene glycol monomethyl Glycol ethers such as ether and propylene glycol monomethyl ether acetate; ethyl acetate, ethyl lactate, ⁇ Esters such as butyrolactone; phenols such as phenol and chlorophenol; amides such as N, N-dimethylformamide, N, N-dimethylacetamide and N-methylpyrrolidone; chloroform, methylene chloride, tetrachloroethane, monochlorobenzene, di Halogen-based solvents such as chlorobenzene; hetero-
- the block copolymer solution may contain other homopolymer (a homopolymer other than the first homopolymer and the second homopolymer in the block copolymer contained in the solution: for example, block copolymer
- a homopolymer other than the first homopolymer and the second homopolymer in the block copolymer contained in the solution for example, block copolymer
- the combination of the first homopolymer and the second homopolymer in the combination is a combination of polystyrene and polymethyl methacrylate
- it may be a homopolymer of a type other than polystyrene and polymethyl methacrylate.
- It may further contain a surfactant, an ionic compound, an antifoaming agent, a leveling agent and the like.
- the microphase separation structure of the block copolymer can be improved.
- polyalkylene oxide can be used to deepen the depth of the unevenness formed by the microphase separation structure.
- polyalkylene oxide polyethylene oxide and polypropylene oxide are more preferable, and polyethylene oxide is particularly preferable.
- polyethylene oxide the following formula: HO— (CH 2 —CH 2 —O) n —H [Wherein, n represents an integer of 10 to 5000 (more preferably an integer of 50 to 1000, still more preferably an integer of 50 to 500). ] The thing represented by these is preferable.
- n is less than the lower limit, the molecular weight is too low, lost by volatilization / evaporation, etc. by heat treatment at high temperature, the effect of containing another homopolymer becomes poor, and when the upper limit is exceeded, Since the molecular weight is too high and the molecular mobility is low, the speed of phase separation becomes slow, which adversely affects the formation of a microphase separation structure.
- the number average molecular weight (Mn) of such another homopolymer is preferably 460 to 220,000, and more preferably 2200 to 46000. If the number average molecular weight is less than the lower limit, the molecular weight is too low and lost due to volatilization / evaporation, etc. by heat treatment at high temperature, the effect of containing other homopolymers becomes poor, and if the upper limit is exceeded, the molecular weight Is too high and the molecular mobility is low, the phase separation speed becomes slow, which adversely affects the formation of the microphase separation structure.
- the molecular weight distribution (Mw / Mn) of such other homopolymer is preferably 1.5 or less, and more preferably 1.0 to 1.3. When the molecular weight distribution exceeds the above upper limit, it is difficult to maintain the uniformity of the microphase separation shape.
- Mn and Mw are values measured by gel permeation chromatography (GPC) and converted to the molecular weight of standard polystyrene.
- the combination of the first homopolymer and the second homopolymer in the block copolymer is a combination of polystyrene and polymethyl methacrylate (polystyrene-polymethyl methacrylate).
- the other homopolymer is preferably a polyalkylene oxide.
- the total content of the block copolymer and the other homopolymer is 0.1% in the block copolymer solution. It is preferably ⁇ 15% by mass, more preferably 0.3 to 5% by mass. When the total content is less than the lower limit, it is not easy to uniformly apply the solution with a sufficient film thickness in order to obtain a required film thickness. Is relatively difficult to prepare.
- the content thereof is preferably 100 parts by mass or less with respect to 100 parts by mass of the block copolymer. More preferably, it is 5 to 100 parts by mass. If the content of such other homopolymer is less than the lower limit, the effect obtained by including the other homopolymer becomes poor.
- polyalkylene oxide used as another homopolymer, its content is more preferably 5 to 70 parts by mass. If the polyalkylene oxide content exceeds 100 parts by mass with respect to 100 parts by mass of the block copolymer, the concavo-convex pattern formed by phase separation of the block copolymer tends to collapse, and if it exceeds 70 parts by mass, Alkylene oxide may precipitate.
- the content thereof is preferably 10 parts by mass or less with respect to 100 parts by mass of the block copolymer. Furthermore, when using the said ionic compound, it is preferable that the content is 10 mass parts or less with respect to 100 mass parts of said block copolymers.
- the block copolymer solution prepared as described above is applied onto the base material 10 to form the thin film 30.
- resin substrates such as a polyimide, polyphenylene sulfide (PPS), polyphenylene oxide, polyether ketone, polyethylene naphthalate, polyethylene terephthalate, polyarylate, triacetylcellulose, polycycloolefin; Glass, octadecyldimethylchlorosilane (ODS) treated glass, octadecyltrichlorosilane (OTS) treated glass, organosilicate treated glass, glass treated with a silane coupling agent, inorganic substrates such as silicon substrates; metal substrates such as aluminum, iron and copper Is mentioned.
- the base material 10 may be subjected to a surface treatment such as an orientation treatment.
- a surface treatment such as an orientation treatment.
- an organosilicate-treated glass is produced by applying a methyl isobutyl ketone (MIBK) solution of methyltrimethoxysilane (MTMS) and 1,2-bis (trimethoxysilyl) ethane (BTMSE) to the glass and heat-treating it.
- MIBK methyl isobutyl ketone
- MTMS methyltrimethoxysilane
- BTMSE 1,2-bis (trimethoxysilyl) ethane
- the octadecyldimethylchlorosilane-treated glass and octadecyltrichlorosilane-treated glass can be produced by a method of immersing the glass in a heptane solution of those silanes and washing away unreacted components later.
- the substrate surface of glass or the like may be surface-treated with a primer layer such as octadecyldimethylchlorosilane or organosilicate, or a block copolymer substrate by performing a silane coupling treatment with a general silane coupling agent.
- Adhesion to can be improved. If the adhesion is insufficient, it peels off during electroforming, which hinders the production of a transfer mold.
- the substrate surface such as glass with ODS or organosilicate in this way, in the heating process described later, the microphase separation structure such as a lamellar structure, a cylinder structure, or a spherical structure is perpendicular to the surface. It becomes easy to arrange. This is because the domain of each block constituting the block copolymer is easily aligned in the vertical direction by reducing the difference in interfacial energy between the block copolymer component and the substrate surface.
- the method for applying the block copolymer solution is not particularly limited.
- spin coating, spray coating, dip coating, dropping, gravure printing, screen printing, letterpress printing, die coating, A curtain coating method or an ink jet method can be employed.
- the thickness of the thin film 30 of the block copolymer is preferably 10 to 3000 nm, more preferably 50 to 500 nm, as described later.
- the thin film 30 made of the block copolymer solution is applied on the base material 10
- the thin film 30 on the base material 10 is dried. Drying can be performed in an air atmosphere.
- the drying temperature is not particularly limited as long as the solvent can be removed from the thin film 30, but is preferably 10 to 200 ° C, and more preferably 20 to 100 ° C.
- corrugation may be seen on the surface of the thin film 30 when the said block copolymer begins to form a micro phase-separation structure by drying.
- the thin film 30 is heated at a temperature equal to or higher than the glass transition temperature (Tg) of the block copolymer (first heating step or annealing step).
- Tg glass transition temperature
- first heating step or annealing step an example of a step for producing a microphase separation structure
- self-assembly of the block copolymer proceeds, and as shown in FIG. 6B, the block copolymer is divided into the first polymer segment 32 and the second polymer segment 32. Microphase separation occurs in the polymer segment 34.
- the heating temperature is lower than the glass transition temperature of the block copolymer, the molecular mobility of the polymer will be low, and the self-assembly of the block copolymer will not proceed sufficiently, making it impossible to form a sufficient microphase separation structure.
- the heating time for sufficiently producing a microphase separation structure is lengthened.
- the upper limit of the heating temperature is not particularly limited as long as the block copolymer is not thermally decomposed.
- the first heating step can be performed in an air atmosphere using an oven or the like. Note that the drying and heating steps may be continuously performed by gradually increasing the heating temperature. By doing so, the drying step is included in the heating step.
- the thin film 30 is etched. Since the first polymer segment 32 and the second polymer segment 34 have different molecular structures, they are easily etched. Therefore, one polymer segment (second polymer segment 34) constituting the block copolymer can be selectively removed by etching treatment according to the polymer segment, that is, the type of homopolymer. As shown in FIG.6 (c), the 2nd polymer segment 34 is removed from a micro phase-separation structure by an etching process, and a remarkable uneven structure appears in a coating film.
- etching treatment for example, an etching method using a reactive ion etching method, an ozone oxidation method, a hydrolysis method, a metal ion staining method, an ultraviolet etching method, or the like can be employed. Further, as the etching treatment, the covalent bond of the block copolymer is treated with at least one selected from the group consisting of an acid, a base and a reducing agent to cut the covalent bond, and then only one polymer segment A method of removing only one polymer segment while maintaining the microphase separation structure may be adopted by washing the coating film on which the microphase separation structure is formed with a solvent or the like that dissolves. In the embodiments described later, ultraviolet etching is used from the viewpoint of ease of operation.
- the concavo-convex structure 36 of the thin film 30 obtained by the etching process is subjected to a second heating or annealing treatment.
- the heating temperature in the second heat treatment is desirably equal to or higher than the glass transition temperature of the first polymer segment 32 remaining after the etching, that is, equal to or higher than the glass transition temperature of the first homopolymer. It is desirable that the temperature is not lower than the transition temperature and not higher than 70 ° C. higher than the glass transition temperature of the first homopolymer. If the heating temperature is lower than the glass transition temperature of the first homopolymer, a desired uneven structure, that is, a smooth chevron structure cannot be obtained after electroforming, or a long time is required for heating.
- the first polymer segment 32 is melted and its shape is greatly collapsed, which is not preferable. In this respect, it is desirable to heat in the range of about 70 ° C. from the glass transition temperature to the glass transition temperature.
- the second heat treatment can be performed in an air atmosphere using an oven or the like.
- the uneven structure 36 of the coating film obtained by the etching process was used as a master (mother mold), and the uneven structure was transferred to a metal mold by electroforming described later, but it was difficult to obtain a desired transfer pattern. I understood. In particular, this problem becomes more pronounced as the molecular weight of the block copolymer increases. As described above, the molecular weight of the block copolymer is deeply related to the microphase separation structure and thus the pitch of the diffraction grating obtained therefrom.
- a pitch distribution is required so that diffraction occurs in a wavelength region including a relatively long wavelength band in a wide range such as the visible region.
- a metal substrate (mold) in which the concavo-convex structure is sufficiently reflected in the subsequent electroforming process can be obtained by heat-treating the concavo-convex structure obtained by etching.
- the etched concavo-convex structure 36 is considered to be a complex cross-sectional structure in which the side surface of the groove defined by the concavo-convex structure is rough, and the concavo-convex (including overhang) is generated in the direction orthogonal to the thickness direction.
- Such a complicated cross-sectional structure causes the following three problems.
- the plating thickness of each part differs depending on the shape of the object to be plated.
- the plated metal is easily attracted to the convex part or protruding corner of the object, and the concave part or the concave part. It is hard to be attracted to. For this reason as well, it is difficult to obtain an electroformed film having a uniform film thickness in the cross-sectional structure of complex irregularities after etching.
- the first polymer segment 32 constituting the side surface of the groove is annealed by heating the concavo-convex structure after etching, and the cross-sectional shape defined by the first polymer segment 32 is shown in FIG. ), which is formed of a relatively smooth inclined surface and is tapered upward from the base material (referred to as “mountain structure” in the present application).
- mountain structure the base material
- no overhangs appear and the metal layer deposited on the first polymer segment 32 is replicated in its reverse pattern and is therefore easily peeled off.
- the corrugated structure 38a may be formed by a solvent annealing process described below instead.
- the volume ratio of the first polymer segment to the second polymer segment in the block copolymer (first polymer segment: second The polymer segment) is in the range of 4: 6 to 6: 4 and more preferably about 5: 5 in order to create a horizontal cylinder structure by self-assembly as described later.
- the volume ratio is out of the above range, it becomes difficult to form a concavo-convex pattern due to the horizontal cylinder structure, and a spherical or vertical cylinder structure tends to appear.
- solvent annealing process After the above-described drying step, the thin film 30 is subjected to solvent annealing (solvent phase separation) in an organic solvent vapor atmosphere to form a block copolymer phase separation structure in the thin film 30.
- solvent annealing treatment self-assembly of the block copolymer proceeds, and the block copolymer is microphase-separated into the first polymer segment 32 and the second polymer segment 34 as shown in FIG.
- the solvent annealing treatment can be performed, for example, by bringing a vapor atmosphere of an organic solvent into a sealable container such as a desiccator and exposing the thin film 30 as an object in this atmosphere.
- a sealable container such as a desiccator
- an organic solvent having a boiling point of 20 ° C. to 120 ° C. is preferable.
- chloroform, dichloromethane, toluene, tetrahydrofuran (THF), acetone, carbon disulfide, a mixed solvent thereof or the like is used.
- chloroform, dichloromethane, acetone, and a mixed solvent of acetone / carbon disulfide are preferable.
- the concentration of the organic solvent vapor is preferably higher in order to promote the phase separation of the block copolymer, desirably a saturated vapor pressure, and concentration management is relatively easy.
- the saturated vapor amount is known to be 0.4 g / l to 2.5 g / l at room temperature (0 ° C. to 45 ° C.).
- the ambient temperature of the solvent annealing is preferably 0 ° C. to 45 ° C. When the temperature is higher than 45 ° C., the uneven structure formed in the thin film becomes loose and easily collapses. In an environment lower than 0 ° C., the organic solvent is difficult to evaporate, and phase separation of the block copolymer is difficult to occur.
- the treatment time of the solvent annealing treatment can be 6 hours to 168 hours, preferably 12 hours to 48 hours, and more preferably 12 hours to 36 hours.
- the solvent annealing treatment time is too long, the other homopolymers are deposited on the surface of the coating film, and the uneven shape tends to be broken (rounded).
- the annealing treatment time is too short, the grooves of the concavo-convex structure are shallow, and when a diffraction grating is produced using a mold, the diffraction effect is insufficient.
- the Applicant has found that the apparent volume ratio of the first homopolymer and the second homopolymer is actually the result of the organic solvent penetrating into one homopolymer and the homopolymer swelling. This is because the mixing ratio of the first homopolymer and the second homopolymer is different.
- the first homopolymer 32 extends in a cylinder shape in a direction substantially parallel to the surface of the substrate 10 in the layer of the second homopolymer 34.
- the orientation is as follows. As a result, in the portion where the first homopolymer 32 exists, the surface layer portion of the second homopolymer 34 rises smoothly to form a waveform.
- the cylindrical arrangement in which the first homopolymer 32 extends in a direction substantially parallel to the surface of the substrate 10 is perpendicular to the surface of the substrate 10 (height direction). It may be formed in a plurality of layers (multiple steps).
- the raised corrugated structure can be directly used as an uneven pattern of an optical substrate such as a diffraction grating. For this reason, unlike the case of phase separation by thermal annealing, it is not necessary to remove one homopolymer by etching after phase separation.
- a part of the horizontal cylinder structure may include a vertical cylinder or a spherical structure.
- the surface shape defined by the polymer segment 34 by the solvent annealing process is a relatively smooth inclined surface as conceptually shown in FIG. (Referred to as “structure”).
- structure In such a corrugated structure, there is no overhang, and the metal layer deposited on the corrugated structure 38a is replicated in its reverse pattern and is therefore easily peeled off.
- the above-described etching process and the second heating step are not necessary, so that the substrate manufacturing process can be simplified.
- the etching process has a problem that dirt and dust are easily generated on the substrate by using an etchant or removing one of the homopolymers, but this problem is also solved because the etching process becomes unnecessary by the solvent annealing process. A substrate with less adhesion of foreign substances can be obtained.
- the uneven structure of the thin film 38a obtained by the solvent annealing treatment may be subjected to heat treatment. Since the corrugated concavo-convex structure has already been formed by the solvent annealing treatment, this heat treatment causes the formed concavo-convex structure, but it is not always necessary. For some reason, there are cases where protrusions are formed on a part of the surface of the concavo-convex structure after the solvent annealing treatment, or it may be effective for the purpose of adjusting the period and height of the concavo-convex structure.
- the heating temperature can be, for example, not less than the glass transition temperature of the first and second polymer segments 32, 34, for example, not less than the glass transition temperature of those homopolymers and not more than 70 ° C. higher than the glass transition temperature. can do.
- the heat treatment can be performed in an air atmosphere using an oven or the like.
- the base material 10 having the chevron structure 38 obtained in the second heating step or the corrugated structure 38a obtained in the solvent annealing step is an inspection object in the inspection apparatus and inspection method of the present invention. Moreover, this base material 10 is used as a master for transfer of a post process.
- the average pitch of the irregularities representing the chevron structure 38 or the corrugated structure 38a is preferably in the range of 100 to 1500 nm, and more preferably in the range of 200 to 1200 nm. If the average pitch of the irregularities is less than the lower limit, the pitch is too small with respect to the wavelength of visible light, so that it is difficult to cause visible light diffraction in a diffraction grating obtained using such a matrix, and exceeds the upper limit.
- the diffraction angle of the diffraction grating obtained by using such a matrix becomes small, and the function as the diffraction grating cannot be fully exhibited.
- the average pitch of the unevenness can be obtained as follows.
- An irregularity analysis image is obtained by measuring an arbitrary 3 ⁇ m square (vertical 3 ⁇ m, horizontal 3 ⁇ m) or 10 ⁇ m square (vertical 10 ⁇ m, horizontal 10 ⁇ m) measurement region of the diffraction grating with an atomic force microscope.
- the obtained uneven analysis image is subjected to flat processing including primary inclination correction, and then subjected to two-dimensional fast Fourier transform processing to obtain a Fourier transform image.
- the distance (unit: ⁇ m ⁇ 1 ) and intensity from the origin of the Fourier transform image are obtained.
- the average value of the intensities is obtained.
- the relationship between the distance from the origin of the obtained Fourier transform image and the average value of the intensity is plotted, and fitting is performed by a spline function, and the wave number at which the intensity reaches the peak is defined as the average wave number ( ⁇ m ⁇ 1 ). The reciprocal thereof is taken as the average pitch.
- the average pitch is obtained by another method, for example, by measuring an arbitrary 3 ⁇ m square (vertical 3 ⁇ m, horizontal 3 ⁇ m) or 10 ⁇ m square (vertical 10 ⁇ m, horizontal 10 ⁇ m) measurement area of the diffraction grating to obtain the unevenness analysis image.
- the average pitch of the unevenness may be obtained by measuring 100 or more intervals between any adjacent convex portions or adjacent concave portions in the unevenness analysis image and calculating the average.
- the Fourier transform image shows a circular pattern whose center is the origin whose absolute value of wave number is 0 ⁇ m ⁇ 1 , and the circular pattern has an absolute value of wave number of 10 ⁇ m ⁇ 1 or less (more preferably). Is in the region of 0.667 to 10 ⁇ m ⁇ 1 , more preferably in the range of 0.833 to 5 ⁇ m ⁇ 1 .
- the circular pattern of the Fourier transform image is a pattern observed when bright spots are gathered in the Fourier transform image. “Circular” as used herein means that the pattern of bright spots appears to be almost circular, and is a concept that includes a part of the outer shape that appears to be convex or concave. .
- a pattern in which bright spots are gathered may appear to be almost circular, and this case is expressed as “annular”.
- annular includes those in which the outer circle of the ring and the inner circle appear to be substantially circular, and the outer circle of the ring and a part of the outer shape of the inner circle are convex or concave. It is a concept including what appears to be.
- the circular or annular pattern has an absolute value of wave number of 10 ⁇ m ⁇ 1 or less (more preferably in the range of 0.667 to 10 ⁇ m ⁇ 1 , more preferably in the range of 0.833 to 5 ⁇ m ⁇ 1 ).
- Is present in the region means that 30% or more (more preferably 50% or more, still more preferably 80% or more, particularly preferably 90% or more) of the luminescent spots constituting the Fourier transform image. Is in a region where the absolute value of the wave number is 10 ⁇ m ⁇ 1 or less (more preferably in the range of 0.667 to 10 ⁇ m ⁇ 1 , more preferably in the range of 0.833 to 5 ⁇ m ⁇ 1 ). In addition, the following is known about the relationship between the pattern of the concavo-convex structure and the Fourier transform image.
- the Fourier transform image also appears as a random pattern (no pattern), but the concavo-convex structure is isotropic in the XY direction as a whole, but the pitch distribution is In some cases, a circular or annular Fourier transform image appears. Further, when the concavo-convex structure has a single pitch, the ring appearing in the Fourier transform image tends to be sharp.
- the two-dimensional fast Fourier transform processing of the unevenness analysis image can be easily performed by electronic image processing using a computer equipped with two-dimensional fast Fourier transform processing software.
- the average height (depth) of the irregularities representing the mountain structure 38 or the corrugated structure 38a is preferably in the range of 20 to 200 nm, more preferably 30 to 150 nm. If the average height of the irregularities is less than the lower limit, the diffraction becomes insufficient because the height is insufficient with respect to the wavelength of visible light. If the upper limit is exceeded, the obtained diffraction grating is placed on the light extraction port side of the organic EL element. When used as an optical element, the electric field distribution inside the EL layer becomes non-uniform, and the element is likely to be destroyed by heat generated by the concentration of the electric field at a specific location, and the life is likely to be shortened.
- the average height of the unevenness is the average value of the depth distribution of the unevenness when the height of the unevenness (the distance in the depth direction between the recessed portion and the protruding portion) on the surface of the chevron structure 38 or the corrugated structure 38a is measured. I mean.
- the average value of the depth distribution of such irregularities is obtained by using a scanning probe microscope (for example, a product name “E-sweep” manufactured by SII Nano Technology Co., Ltd.). After measuring the analysis image, 100 or more distances in the depth direction with respect to arbitrary concave portions and convex portions in the concave-convex analysis image are measured, and a value calculated by calculating the average is adopted.
- the surface of the master chevron structure 38 obtained in the second heating step or the corrugated structure 38a obtained in the solvent annealing step as described above is used for the subsequent electroforming process.
- a seed layer 40 to be a conductive layer is formed.
- the seed layer 40 can be formed by electroless plating, sputtering, or vapor deposition.
- the thickness of the seed layer 40 is preferably 10 nm or more, more preferably 20 nm or more in order to make the current density uniform in the subsequent electroforming process and to make the thickness of the metal layer deposited by the subsequent electroforming process constant. is there.
- seed layer materials include nickel, copper, gold, silver, platinum, titanium, cobalt, tin, zinc, chromium, gold / cobalt alloy, gold / nickel alloy, boron / nickel alloy, solder, copper / nickel / chromium An alloy, a tin-nickel alloy, a nickel-palladium alloy, a nickel-cobalt-phosphorus alloy, or an alloy thereof can be used. It should be noted that the seed layer has a relatively chevron or corrugated shape as shown in FIG. 6 (d) or FIGS. 7 (a) and (b), as compared with a complicated cross-sectional structure as shown in FIG. 6 (c). It is thought that it adheres with a more uniform thickness without leakage due to a smooth structure.
- a metal layer 50 is deposited on the seed layer 40 by electroforming (electroplating).
- the thickness of the metal layer 50 can be set to a total thickness of 10 to 3000 ⁇ m including the thickness of the seed layer 40, for example.
- Any of the above metal species that can be used as the seed layer 40 can be used as the material of the metal layer 50 deposited by electroforming. From the viewpoints of wear resistance as a mold of the metal substrate, releasability and the like, nickel is preferable. In this case, it is preferable to use nickel for the seed layer 40 as well.
- the current density in electroforming can be set to, for example, 0.03 to 10 A / cm 2 from the viewpoint of shortening the electroforming time while suppressing the bridge to form a uniform metal layer.
- the formed metal layer 50 has an appropriate hardness and thickness in view of the ease of processing such as pressing, peeling and cleaning of the subsequent resin layer.
- the surface of the metal layer may be subjected to diamond-like carbon (DLC) treatment or Cr plating treatment.
- the metal layer may be further heat treated to increase its surface hardness.
- the metal layer 50 including the seed layer 40 obtained as described above is peeled from the base material having the concavo-convex structure to obtain a metal substrate that becomes a father.
- the peeling method may be physically peeled off, and the first homopolymer and the remaining block copolymer are removed by dissolving them using an organic solvent such as toluene, tetrahydrofuran (THF) or chloroform. May be.
- a cleaning process When the metal substrate 70 is peeled from the base material 10 having the mountain structure 38 or the corrugated structure 38a as described above, a polymer such as the first polymer segment or the second polymer segment as shown in FIG. In some cases, a part 60 may remain on the metal substrate 70. In such a case, those remaining portions 60 can be removed by washing.
- a cleaning method wet cleaning or dry cleaning can be used. The wet cleaning can be removed by cleaning with an organic solvent such as toluene or tetrahydrofuran, a surfactant, or an alkaline solution. When an organic solvent is used, ultrasonic cleaning may be performed. Further, it may be removed by electrolytic cleaning.
- the dry cleaning it can be removed by ashing using ultraviolet rays or plasma.
- a combination of wet cleaning and dry cleaning may be used. After such washing, rinsing with pure water or purified water may be performed, followed by ozone irradiation after drying.
- a metal substrate (mold) 70 having a desired uneven structure is obtained (FIG. 8D).
- This metal substrate 70 is an inspection target of the inspection apparatus and inspection method of the present invention as a light non-transparent substrate.
- a release treatment may be performed on the metal substrate 70 in order to improve the release from the resin.
- a mold release treatment a prescription for lowering the surface energy is generally used, and there is no particular limitation.
- a mold release agent 72 such as a fluorine-based material or a silicone resin is applied to the metal substrate 70 as shown in FIG. Examples thereof include a method of coating the uneven surface 70a, a method of treating with a fluorine-based silane coupling agent, and a method of forming a diamond-like carbon film on the surface.
- the concavo-convex structure (pattern) of the metal substrate is transferred to the resin layer 80 to manufacture a mother.
- a transfer processing method as shown in FIG. 9B, for example, a curable resin is applied to the transparent support substrate 90, and then the resin layer 80 is cured while pressing the uneven structure of the metal substrate 70 against the resin layer 80.
- the transparent support substrate 90 for example, a base material made of a transparent inorganic material such as glass; polyethylene terephthalate (PET), polyethylene terephthalate (PEN), polycarbonate (PC), cycloolefin polymer (COP), polymethyl methacrylate (PMMA)
- a base material made of resin such as polystyrene (PS); a gas barrier layer made of an inorganic material such as SiN, SiO 2 , SiC, SiO x N y , TiO 2 , Al 2 O 3 on the surface of the base material made of these resins
- the thickness of the transparent support substrate can be in the range of 1 to 500 ⁇ m.
- the curable resin examples include resins such as photo-curing and thermosetting, moisture-curing type, and chemical-curing type (two-component mixing). Specifically, epoxy, acrylic, methacrylic, vinyl ether, oxetane, urethane, melamine, urea, polyester, polyolefin, phenol, cross-linked liquid crystal, fluorine, silicone, polyamide And various resins such as monomers, oligomers and polymers.
- the thickness of the curable resin is preferably in the range of 0.5 to 500 ⁇ m.
- the thickness is less than the lower limit, the height of the irregularities formed on the surface of the cured resin layer tends to be insufficient, and if the thickness exceeds the upper limit, the influence of the volume change of the resin that occurs during curing increases and the irregular shape is well formed. It may not be possible.
- Examples of the method for applying the curable resin include spin coating, spray coating, dip coating, dropping, gravure printing, screen printing, letterpress printing, die coating, curtain coating, ink jet, and sputtering.
- Various coating methods such as a method can be employed.
- conditions for curing the curable resin vary depending on the type of resin used, but for example, the curing temperature is in the range of room temperature to 250 ° C., and the curing time is in the range of 0.5 minutes to 3 hours. Is preferred.
- a method of curing by irradiating energy rays such as ultraviolet rays or electron beams may be used. In that case, the irradiation amount is preferably in the range of 20 mJ / cm 2 to 5 J / cm 2 .
- the metal substrate 70 is removed from the cured resin layer 80 after curing.
- the method for removing the metal substrate 70 is not limited to the mechanical peeling method, and any known method can be adopted.
- a resin film structure 100 having a cured resin layer 80 in which irregularities are formed on the transparent support substrate 90 can be obtained.
- the resin structure 100 can be used as it is as a diffraction grating.
- the resin structure 100 is an inspection object of the inspection apparatus and inspection method of the present invention as a light-transmitting substrate.
- the substrate manufacturing method by the BCP method can be used not only for manufacturing a diffraction grating provided on the light extraction port side of an organic EL element but also for manufacturing an optical component having a fine pattern used in various devices. .
- it can be used for producing an optical element for imparting a light confinement effect to the inside of a solar cell by being installed on the photoelectric conversion surface side of the wire grid polarizer, antireflection film, or solar cell.
- the resin film structure 100 having a desired pattern can be obtained.
- the reverse pattern of the resin film structure 100 is used as a diffraction grating, the resin film obtained through the above-described metal substrate transfer process.
- the curable resin layer 82 is applied onto another transparent support substrate 92 as shown in FIG.
- the resin film structure 100 is pressed against the curable resin layer 82 to cure the curable resin layer 82.
- the resin film structure 100 is peeled from the cured curable resin layer 82, whereby a replica 110 which is another resin film structure as shown in FIG. 9E can be obtained.
- the above-described transfer process may be performed using the replica 110 as a master to manufacture a reverse pattern replica of the replica 110, and the transfer process may be repeated again using the reverse pattern as a master to form a child replica. Also good.
- Such replicas 110 and child replicas also have irregular uneven patterns on the surface, and are therefore inspection targets of the inspection apparatus and inspection method of the present invention.
- the method for forming a substrate having a concavo-convex pattern using a sol-gel material mainly includes a solution preparation step for preparing a sol solution, a coating step for applying the prepared sol solution to the substrate, and a coating film of the sol solution applied to the substrate.
- Drying process pressing process for pressing the mold on which the transfer pattern is formed, temporary baking process for temporarily baking the coating film on which the mold is pressed, peeling process for peeling the mold from the coating film, and main baking of the coating film It has a main firing step.
- each process is demonstrated in order.
- a sol solution is prepared in order to form a coating film on which a pattern is transferred by a sol-gel method (solution preparation step).
- a sol solution of a metal alkoxide sica precursor
- tetramethoxysilane MTES
- tetraethoxysilane TEOS
- tetra-i-propoxysilane tetra-n-propoxysilane
- tetra-i-butoxysilane tetra-n-butoxysilane
- tetra-n-butoxysilane tetra-n-butoxysilane
- tetra- Tetraalkoxide monomers such as sec-butoxysilane and tetra-t-butoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, isopropyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane Ethoxysilane, propyltriethoxysilane, isopropyltriethoxysilane
- Monomers having a xy group monomers having a styryl group such as p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3- A monomer having a methacryl group such as methacryloxypropyltriethoxysilane, a monomer having an acryl group such as 3-acryloxypropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2 -(Aminoethyl) -3-aminopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene)
- alkyl groups and phenyl groups may be substituted with fluorine.
- metal acetylacetonate, metal carboxylate, oxychloride, chloride, a mixture thereof and the like can be mentioned, but are not limited thereto.
- examples of the metal species include Ti, Sn, Al, Zn, Zr, In, and a mixture thereof, but are not limited thereto. What mixed suitably the precursor of the said metal oxide can also be used. Moreover, you may hydrophobize these surfaces. A known method may be used for the hydrophobizing treatment.
- the surface is silica
- it can be hydrophobized with dimethyldichlorosilane, trimethylalkoxysilane, or the like, or trimethylsilyl such as hexamethyldisilazane.
- a method of hydrophobizing with an agent and silicone oil may be used, or a surface treatment method of metal oxide powder using supercritical carbon dioxide may be used.
- a silane coupling agent having a hydrolyzable group having affinity and reactivity with silica and an organic functional group having water repellency can be used as a precursor of silica.
- silane monomers such as n-octyltriethoxysilane, methyltriethoxysilane, and methyltrimethoxysilane
- vinylsilanes such as vinyltriethoxysilane, vinyltrimethoxysilane, vinyltris (2-methoxyethoxy) silane, vinylmethyldimethoxysilane
- Methacrylic silane such as 3-methacryloxypropyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane
- 3-glycyl Epoxy silanes such as Sidoxypropyltriethoxysilane, 3-Mercaptopropyltrimethoxysilane, Mercaptosilanes such as 3-Mercaptopropyltriethoxysilane, 3-Octanoyl
- the mixing ratio can be 1: 1, for example, in a molar ratio.
- This sol solution produces amorphous silica by performing hydrolysis and polycondensation reactions.
- an acid such as hydrochloric acid or an alkali such as ammonia is added.
- the pH is preferably 4 or less or 10 or more.
- the amount of water to be added can be 1.5 times or more in molar ratio with respect to the metal alkoxide species.
- a material other than silica can be used as the sol-gel material.
- a Ti-based material, an ITO (indium tin oxide) -based material, Al 2 O 3 , ZrO 2 , ZnO, or the like can be used.
- the solvent examples include alcohols such as methanol, ethanol, isopropyl alcohol (IPA) and butanol, aliphatic hydrocarbons such as hexane, heptane, octane, decane and cyclohexane, and aromatic carbonization such as benzene, toluene, xylene and mesitylene.
- alcohols such as methanol, ethanol, isopropyl alcohol (IPA) and butanol
- aliphatic hydrocarbons such as hexane, heptane, octane, decane and cyclohexane
- aromatic carbonization such as benzene, toluene, xylene and mesitylene.
- Ethers such as hydrogen, diethyl ether, tetrahydrofuran and dioxane, ketones such as acetone, methyl ethyl ketone, isophorone and cyclohexanone, ether alcohols such as butoxyethyl ether, hexyloxyethyl alcohol, methoxy-2-propanol and benzyloxyethanol; Glycols such as ethylene glycol and propylene glycol, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, propylene glycol Glycol ethers such as nomethyl ether acetate, esters such as ethyl acetate, ethyl lactate and ⁇ -butyrolactone, phenols such as phenol and chlorophenol, N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl Amides such as pyrrolidone, halogen-based solvents such as chloroform, methylene
- Additives include polyethylene glycol, polyethylene oxide, hydroxypropyl cellulose, polyvinyl alcohol for viscosity adjustment, alkanolamines such as triethanolamine which is a solution stabilizer, ⁇ -diketones such as acetylacetone, ⁇ -ketoesters, formamide, Dimethylformamide, dioxane and the like can be used.
- the sol solution prepared as described above is applied on the substrate (application process).
- Substrates made of inorganic materials such as glass, quartz and silicon substrates, polyethylene terephthalate (PET), polyethylene terephthalate (PEN), polycarbonate (PC), cycloolefin polymer (COP), polymethyl methacrylate (PMMA), polystyrene Resin substrates such as (PS), polyimide (PI), and polyarylate can be used.
- the substrate may be transparent or opaque. If the concavo-convex pattern substrate obtained from this substrate is used for the production of an organic EL element described later, the substrate is preferably a substrate having heat resistance and light resistance against UV light and the like.
- a substrate made of an inorganic material such as glass, quartz, or a silicon substrate is more preferable.
- a surface treatment or an easy-adhesion layer may be provided on the substrate, or a gas barrier layer may be provided for the purpose of preventing the ingress of gases such as moisture and oxygen.
- a coating method any coating method such as a bar coating method, a spin coating method, a spray coating method, a dip coating method, a die coating method, and an ink jet method can be used, but the sol solution is uniformly applied to a relatively large area substrate.
- the bar coating method, the die coating method and the spin coating method are preferable because the coating can be completed quickly before the sol solution is gelled.
- the substrate surface including surface treatment and an easily adhesive layer, if any
- the substrate surface may be flat. Has no pattern.
- the substrate is held in the air or under reduced pressure in order to evaporate the solvent in the coated film (hereinafter also referred to as “sol-gel material layer” as appropriate) (drying step).
- the resin film structure 100 (mold) is pressed against the coating film (pressing step).
- the resin film structure 100 may be pressed using a pressing roll. In the roll process, compared to the press type, the time for contact between the mold and the coating film is short.
- the coating film may be temporarily fired (temporary firing step).
- pre-baking gelation of the coating film is promoted, the pattern is solidified, and it is difficult to collapse during peeling.
- pre-baking it is preferably heated in the atmosphere at a temperature of 40 to 150 ° C. Note that the preliminary firing is not necessarily performed.
- the resin film structure 100 is peeled from the coating film (sol-gel material layer) after the pressing step or the pre-baking step.
- the peel force may be smaller than that of a plate-shaped mold, and the mold can be easily peeled off from the coating film without remaining in the mold.
- the coating film is baked (main baking process).
- the main baking is preferably performed at a temperature of 200 to 1200 ° C. for about 5 minutes to 6 hours.
- the coating film is cured to directly form a sol-gel structure (diffraction grating) having a concavo-convex pattern film corresponding to the concavo-convex pattern of the resin film structure 100, that is, a sol-gel material layer having an irregular concavo-convex pattern on a flat substrate.
- a formed sol-gel structure (diffraction grating) is obtained.
- the silica that is the sol-gel material layer becomes amorphous or crystalline, or a mixed state of amorphous and crystalline depending on the firing temperature and firing time.
- the sol-gel structure thus obtained is also an inspection object of the inspection apparatus and inspection method of the present invention.
- a film may be laminated on the surface of the resin film structure 100 or the replica 110 on which the concavo-convex pattern is formed by a vapor phase method such as a vapor deposition method or a sputtering method.
- a deposited film examples include metals such as aluminum, gold, silver, platinum, and nickel, and metal oxides such as aluminum oxide.
- the thickness of such a film is preferably 5 to 500 nm. If the thickness is less than the lower limit, it is difficult to obtain a uniform film, and the effect of sufficiently reducing the adhesiveness is reduced. If the thickness exceeds the upper limit, the shape of the matrix tends to be distorted.
- post curing may be appropriately performed by irradiating ultraviolet light again after the resin is cured.
- the curable resins 80 and 82 are respectively applied to the transparent support substrates 90 and 92. It is also possible to apply a curable resin directly to the substrate and remove it after curing. Alternatively, instead of applying the resin to the surface of the mother die, a concave / convex film of a cured resin obtained by pressing the mother die against the resin coating and curing the resin may be used as the mother die.
- the BKL method forms a deposited film on the surface of a polymer film made of a polymer whose volume changes by heat under a temperature condition of 70 ° C. or higher. Then, by cooling the polymer film and the vapor deposition film, a step of forming irregularities by wrinkles on the surface of the vapor deposition film (uneven shape forming step), and a matrix material is attached and cured on the vapor deposition film. And a step of removing the matrix material after curing from the vapor deposition film to obtain a matrix (matrix forming step).
- FIG. 10A to 10 (d) are schematic views for explaining a preferred embodiment of a method for manufacturing a mother die in a method for manufacturing a diffraction grating by the BKL method.
- FIG. 10A is a cross-sectional view schematically showing a state in which the vapor deposition film 28 is formed on the surface of the polymer film 27 in the manufacturing method of the master mold
- FIG. 10C is a cross-sectional view schematically showing a state in which irregularities due to wrinkles are formed on the surface of the vapor deposition film 28 by cooling the substrate
- FIG. 10D is a cross-sectional view schematically showing a state in which the matrix 29 after curing is removed from the vapor deposition film 28.
- FIG. 10A is a cross-sectional view schematically showing a state in which the vapor deposition film 28 is formed on the surface of the polymer film 27 in the manufacturing method of the master mold
- FIG. 10C is a cross-sectional view schematically showing a state in which irregularities
- a polymer film made of a polymer whose volume is changed by heat is prepared.
- a polymer whose volume is changed by heating or cooling for example, a coefficient of thermal expansion of 50 ppm / K or more
- a silicone-based polymer is more preferable and contains polydimethylsiloxane.
- a silicone polymer is particularly preferable.
- Examples of methods for forming the polymer film in this way include, for example, spin coating, dip coating, dropping, gravure printing, screen printing, letterpress printing, die coating, curtain coating, ink jet, and spraying.
- a coating method, a sputtering method, a vacuum deposition method, or the like can be employed.
- the thickness of such a polymer film is preferably in the range of 10 to 5000 ⁇ m, and more preferably in the range of 10 to 2000 ⁇ m.
- a vapor deposition film 28 is formed on the surface of the polymer film 27 under a temperature condition of 70 ° C. or higher (see FIG. 10A).
- the temperature at the time of forming the vapor deposition film 28 needs to be 70 degreeC or more, it is more preferable that it is 90 degreeC or more. If the said temperature is less than 70 degreeC, the unevenness
- a known method such as a vapor deposition method or a sputtering method can be appropriately employed.
- the material of the vapor deposition film 28 is not particularly limited, and examples thereof include metals such as aluminum, gold, silver, platinum, and nickel, and metal oxides such as aluminum oxide.
- the polymer film 27 and the vapor deposition film 28 are then cooled to form irregularities due to wrinkles on the surface of the vapor deposition film 28 (see FIG. 10B).
- the thermal expansion coefficient of the polymer film 27 and the thermal expansion coefficient of the vapor deposition film 28 As shown in FIG. 10B, unevenness (so-called buckling pattern or so-called Turing pattern) due to wrinkles can be formed on the surface of the deposited film 28 as shown in FIG.
- membrane 28 after cooling is 40 degrees C or less.
- the cooling rate when the polymer film 27 and the deposited film 28 are cooled is preferably in the range of 1 to 80 ° C./min.
- the temperature lowering rate is less than the lower limit, the unevenness tends to be relaxed, and when it exceeds the upper limit, scratches such as cracks tend to occur on the surface of the polymer film or the deposited film.
- a mother die material 29 is attached on the vapor deposition film 28 and cured.
- matrix material 29 is not particularly limited, and examples thereof include inorganic substances such as nickel, silicon, silicon carbide, tantalum, glassy carbon, quartz, silica, etc .; silicone polymers (silicone rubber), urethane rubber, norbornene resin, Examples of the resin composition include polycarbonate, polyethylene terephthalate, polystyrene, polymethyl methacrylate, acrylic, and liquid crystal polymer.
- silicone-based polymers nickel, silicon, silicon carbide, tantalum, glassy carbon, quartz, and silica are more preferable from the viewpoint of moldability, followability of fine shapes, and mold separation, and silicone-based polymers. Is more preferable, and a silicone-based polymer containing polydimethylsiloxane is particularly preferable.
- the method for attaching the matrix material 29 in this way is not particularly limited, and for example, vacuum deposition method; spin coating method, spray coating method, dip coating method, dropping method, gravure printing method, screen printing method, Various coating methods such as a relief printing method, a die coating method, a curtain coating method, an ink jet method, and a sputtering method can be employed.
- the conditions for curing the matrix material 29 vary depending on the type of the matrix material used.
- the curing temperature is in the range of room temperature to 250 ° C.
- the curing time is in the range of 0.5 minutes to 3 hours. It is preferable that Further, a method of curing by irradiating energy rays such as ultraviolet rays or electron beams may be used. In that case, the irradiation amount is preferably in the range of 20 mJ / cm 2 to 10 J / cm 2 .
- the matrix material 29 after curing is removed from the vapor deposition film 28 to obtain the matrix 29 as shown in FIG.
- the method for removing the matrix 29 from the vapor deposition film 28 is not particularly limited, and a known method can be adopted as appropriate.
- the mother die 29 thus obtained is an inspection object of the inspection apparatus and inspection method of the present invention.
- a substrate having an irregular uneven pattern obtained in the course thereof, such as a substrate having a buckling pattern as shown in FIG. 10B, is also an inspection object of the inspection apparatus and inspection method of the present invention. It becomes.
- the uneven shape forming step and the mother die forming step may be repeated using the mother die 29 obtained as a polymer film. In this way, the wrinkles formed on the surface of the mother die can be deepened, and the average height of the irregularities formed on the surface of the mother die can be increased.
- a resin (a material used for the matrix material) may be applied to the surface of the obtained matrix 29 and cured, and then removed from the matrix 29 may be used as a matrix.
- a concave / convex film of a cured resin obtained by pressing the matrix 29 against the resin coating and curing the resin may be used as the matrix. In this way, a resin film with the irregularities reversed can also be used as a matrix.
- the final master die may be manufactured by repeating the inversion and transfer of irregularities from the master die 29 through one or more intermediate master dies.
- an intermediate matrix a structure in which the uneven structure is appropriately reversed or transferred as described above can be used.
- a non-flexible substrate for example, a glass substrate
- it is also possible to temporarily transfer it to a flexible material for example, plastic film or silicone rubber. It tends to be easy to match (match even-odd).
- a polymer film obtained by applying a polymer whose volume is changed by heat to these intermediate mother molds and curing is used as a mother mold 29, and the uneven shape forming process and the mother mold forming process are repeated. May be.
- the intermediate matrix is made of a UV curable resin
- post-cure may be performed by irradiating the ultraviolet light again. Good. In this way, by carrying out post-cure by irradiating UV light to the mother mold made of UV curable resin again, the degree of cross-linking of the mother mold tends to improve, and mechanical strength and chemical resistance tend to improve. .
- the mother die may be plated using a known method to form the mother die as a metal die.
- a metal mold By plating in this way to form a metal mold, there is a tendency to obtain a matrix that has excellent mechanical strength and can be used repeatedly.
- the matrix thus plated as a mold such as nanoimprint, it is possible to mass-produce a resin substrate having a predetermined uneven pattern by repeatedly transferring it to a cured resin substrate.
- Examples of materials that can be used for such plating include nickel, copper, iron, nickel cobalt alloy, nickel iron alloy, and the like.
- the thickness of such a plating layer is preferably 50 ⁇ m to 1 mm from the viewpoint of mechanical strength, time required for mold production, and the like.
- a matrix obtained by the BKL method heated at about 80 to 200 ° C. under atmospheric pressure for about 1 to 48 hours may be used as a matrix used for manufacturing a diffraction grating.
- a diffraction grating having a good concavo-convex structure can be obtained as a diffraction grating, particularly for an organic EL element.
- a substrate (matrix) having an irregular concavo-convex pattern on the surface is obtained by carrying out the BKL method as described above, and any substrate or sol-gel structure obtained by transfer using such a substrate can be obtained. Moreover, it becomes an inspection object of the inspection apparatus and inspection method of the present invention.
- the transparent electrode 3 is laminated on the resin layer 80 of the resin film structure 100 so that the concavo-convex structure formed on the surface of the resin layer 80 is maintained.
- a material of the transparent electrode 3 for example, indium oxide, zinc oxide, tin oxide, and indium tin oxide (ITO) that is a composite thereof, gold, platinum, silver, and copper are used. Among these, ITO is preferable from the viewpoints of transparency and conductivity.
- the thickness of the transparent electrode 3 is preferably in the range of 20 to 500 nm.
- the conductivity tends to be insufficient, and if it exceeds the upper limit, the transparency may be insufficient and the emitted EL light may not be sufficiently extracted to the outside.
- a known method such as a vapor deposition method or a sputtering method can be appropriately employed. Among these methods, the sputtering method is preferable from the viewpoint of improving adhesion.
- the organic layer 4 shown in FIG. 11 is laminated on the transparent electrode 3 so as to maintain the uneven shape formed on the surface of the resin layer 80.
- the organic layer 4 is not particularly limited as long as it can be used for the organic layer of the organic EL element, and a known organic layer can be appropriately used.
- Such an organic layer 4 may be a laminate of various organic thin films.
- a laminate comprising an anode buffer layer 11, a hole transport layer 12, and an electron transport layer 13 as shown in FIG. It may be a body.
- examples of the material of the anode buffer layer 11 include copper phthalocyanine and PEDOT.
- Examples of the material for the hole transport layer 12 include derivatives such as triphenylamine, triphenyldiamine derivative (TPD), benzidine, pyrazoline, styrylamine, hydrazone, triphenylmethane, and carbazole. Furthermore, examples of the material for the electron transport layer 13 include an aluminum quinolinol complex (Alq), a phenanthroline derivative, an oxadiazole derivative, a triazole derivative, a phenylquinoxaline derivative, and a silole derivative.
- Such an organic layer 4 is, for example, a laminate of a hole injection layer made of a triphenylamine derivative or the like and a light emitting layer made of a fluorescent organic solid such as anthracene, or such a light emitting layer.
- a laminate with an electron injection layer made of a perylene derivative or the like, or a laminate with these hole injection layer, light emitting layer, and electron injection layer may be used.
- the organic layer 4 may be a laminate including a hole transport layer, a light emitting layer, and an electron transport layer.
- the material for the hole transport layer includes phthalocyanine derivatives, naphthalocyanine derivatives, porphyrin derivatives, N, N′-bis (3-methylphenyl)-(1,1′-biphenyl) -4,4′-diamine (TPD).
- the light emitting layer is provided to recombine holes injected from the transparent electrode and electrons injected from the metal electrode to emit light
- materials usable for the light emitting layer include anthracene, naphthalene, Organometallic complexes such as pyrene, tetracene, coronene, perylene, phthaloperylene, naphthaloperylene, diphenylbutadiene, tetraphenylbutadiene, coumarin, oxadiazole, bisbenzoxazoline, bisstyryl, cyclopentadiene, aluminum quinolinol complex (Alq3), tri- ( p-terphenyl-4-yl) amine, 1-aryl-2,5-di (2-thienyl) pyrrole derivative, pyran, quinacridone, rubrene, distyrylbenzene derivative, distyrylarylene derivative, distyrylamine derivative and various Fluorescent color Or the like can
- a material system that emits light from a spin multiplet for example, a phosphorescent material that emits phosphorescence, and a compound that includes a part thereof in a part of the molecule can be preferably used.
- the phosphorescent material preferably contains a heavy metal such as iridium.
- nitro-substituted fluorene derivatives diphenylquinone derivatives, thiopyran dioxide derivatives, heterocyclic tetracarboxylic anhydrides such as naphthaleneperylene, carbodiimide, fluorenylidenemethane derivatives, anthraquinodimethane and And organometallic complexes such as anthrone derivatives, oxadiazole derivatives, and aluminum quinolinol complexes (Alq3).
- heterocyclic tetracarboxylic anhydrides such as naphthaleneperylene, carbodiimide, fluorenylidenemethane derivatives, anthraquinodimethane and And organometallic complexes such as anthrone derivatives, oxadiazole derivatives, and aluminum quinolinol complexes (Alq3).
- a thiadiazole derivative in which an oxygen atom of the oxadiazole ring is substituted with a sulfur atom, or a quinoxaline derivative having a quinoxaline ring known as an electron withdrawing group can also be used as an electron transport material.
- a polymer material in which these materials are introduced into a polymer chain or these materials are used as a polymer main chain can also be used.
- the hole transport layer or the electron transport layer may also serve as the light emitting layer.
- the organic layer between a transparent electrode and the metal electrode mentioned later becomes two layers.
- a metal fluoride such as lithium fluoride (LiF) or Li 2 O 3 is formed on the transparent electrode 3 or the organic layer 4.
- a layer made of a highly active alkaline earth metal such as a chemical compound, Ca, Ba, or Cs, an organic insulating material, or the like may be provided.
- the organic layer 4 is a laminate composed of the anode buffer layer 11, the hole transport layer 12, and the electron transport layer 13, from the viewpoint of maintaining the uneven shape formed on the surface of the cured resin layer, the anode buffer
- the thicknesses of the layer 11, the hole transport layer 12, and the electron transport layer 13 are preferably in the range of 1 to 50 nm, 5 to 200 nm, and 5 to 200 nm, respectively.
- the organic layer 4 is a laminate composed of a hole transport layer, a light emitting layer, and an electron transport layer
- the thicknesses of the hole transport layer, the light emitting layer, and the electron transport layer are each in the range of 1 to 200 nm, 5 A range of ⁇ 100 nm and a range of 5 ⁇ 200 nm are preferred.
- a known method such as a vapor deposition method, a sputtering method, or a die coating method can be appropriately employed. Among these methods, the vapor deposition method is preferable from the viewpoint of maintaining the uneven shape formed on the surface of the resin layer 80.
- the metal electrode 5 is laminated on the organic layer 4 so as to maintain the uneven shape formed on the surface of the resin layer 80.
- a material of the metal electrode 5 a substance having a small work function can be appropriately used, and is not particularly limited. Examples thereof include aluminum, MgAg, MgIn, and AlLi.
- the thickness of the metal electrode 5 is preferably in the range of 50 to 500 nm. If the thickness is less than the lower limit, the conductivity tends to decrease, and if the thickness exceeds the upper limit, it may be difficult to maintain the uneven shape.
- the metal electrode 5 can be laminated by employing a known method such as vapor deposition or sputtering. Among these methods, the vapor deposition method is preferable from the viewpoint of maintaining the uneven structure formed on the surface of the resin layer 80. Thus, an organic EL element 400 having a structure as shown in FIG. 11 is obtained.
- the transparent electrode 3, the organic layer 4 and the metal electrode 5 maintain the chevron or corrugated structure of the resin layer 80, respectively. In this way, it is easy to stack, and it is possible to sufficiently suppress the light generated in the organic layer 4 from being totally reflected at each interface and repeating multiple reflections inside the device. Further, the light totally reflected at the interface between the transparent support substrate 90 and the air can be re-emitted by the diffraction effect.
- the transparent electrode 3, the organic layer 4, and the metal electrode 5 are also likely to have a structure similar to the chevron or corrugated structure formed on the surface of the resin layer 80, as a result, the transparent electrode 3 and the metal electrode 5 The distance between the electrodes is partially shortened. Therefore, as compared with a case where the distance between the transparent electrode 3 and the metal electrode 5 is uniform, an increase in electric field strength can be expected when a voltage is applied, and the light emission efficiency of the organic EL element can also be improved.
- the average height of the unevenness formed on the surface of the diffraction grating (cured curable resin surface) is as described above.
- it is preferably in the range of 20 to 200 nm, more preferably 30 to 150 nm.
- the average pitch of the irregularities formed on the surface of the diffraction grating (cured curable resin surface) is 100 to 1500 nm as described above. Is preferable, and a range of 200 to 1200 nm is more preferable.
- Example 1 a diffraction grating substrate used for an organic EL element is manufactured as a substrate having an irregular uneven surface.
- a block copolymer manufactured by Polymer Source comprising the following polystyrene (hereinafter abbreviated as “PS” where appropriate) and polymethyl methacrylate (hereinafter abbreviated as “PMMA” where appropriate) was prepared.
- PS segment Mn 750,000
- PMMA segment Mn 720,000
- Mn of block copolymer 1,470,000
- Volume ratio of PS segment to PMMA segment (PS: PMMA) 54: 46
- Molecular weight distribution (Mw / Mn) 1.21
- Tg of PS segment 107 ° C.
- PMMA segment Tg 134 ° C
- the volume ratio of the first and second polymer segments in the block copolymer is such that the density of polystyrene is 1.05 g / cm 3 and the density of polymethyl methacrylate is It was calculated as 1.19 g / cm 3 .
- the number average molecular weight (Mn) and the weight average molecular weight (Mw) of the polymer segment or polymer are gel permeation chromatography (manufactured by Tosoh Corporation, model number “GPC-8020”, TSK-GEL SuperH1000, SuperH2000, SuperH3000, and SuperH4000 in series.
- the glass transition point (Tg) of the polymer segment was determined by using a differential scanning calorimeter (manufactured by Perkin-Elmer, product name “DSC7”) at a temperature increase rate of 20 ° C./min in the temperature range of 0 to 200 ° C. Measurement was performed while raising the temperature.
- the solubility parameters of polystyrene and polymethylmethacrylate are 9.0 and 9.3, respectively (see Chemical Handbook, Application, 2nd revised edition).
- the block copolymer solution was filtered through a membrane filter having a pore size of 0.5 ⁇ m to obtain a block copolymer solution.
- a mixed solution of 1 g of Shin-Etsu Silicone KBM-5103, 1 g of ion-exchanged water, 0.1 ml of acetic acid, and 19 g of isopropyl alcohol was spin-coated on a glass substrate (after 10 seconds at a rotation speed of 500 rpm, followed by For 45 seconds at 800 rpm). It processed at 130 degreeC for 15 minute (s), and the silane coupling process glass was obtained.
- the obtained block copolymer solution was applied on a silane coupling-treated glass as a base material with a film thickness of 150 to 170 nm by spin coating.
- the spin coating was performed at a rotational speed of 200 rpm for 10 seconds, and subsequently at 300 rpm for 30 seconds.
- the substrate on which the thin film was formed was left to stand in a desiccator previously filled with chloroform vapor for 24 hours at room temperature, thereby subjecting it to a solvent annealing treatment.
- a screw bottle filled with 100 g of chloroform was installed in the desiccator (capacity 5 L), and the atmosphere in the desiccator was filled with chloroform having a saturated vapor pressure. Unevenness was observed on the surface of the thin film after the solvent annealing treatment, and it was found that the block copolymer constituting the thin film was micro-layer separated.
- the cross section of the thin film was observed with a transmission electron microscope (TEM) (H-7100FA manufactured by Hitachi, Ltd.), the circular cross sections of the PS portion were separated from each other in the direction parallel to the substrate surface, and the direction perpendicular to the substrate surface It was found that the PS portion was phase-separated from the PMMA portion to the horizontal cylinder structure when considered together with the analysis image of the atomic force microscope.
- the PS part was a core (island), and the PMMA part was surrounded by it (the sea).
- a corrugated thin film was obtained by solvent annealing.
- the surface of the thin film (stage before electroforming) corrugated by the solvent annealing treatment was analyzed with an atomic force microscope (scanning probe microscope “Nonavi II station / E-sweep” with an environmental control unit manufactured by SII Nanotechnology) ).
- the average pitch of the concavo-convex pattern calculated from the concavo-convex analysis image of the thin film surface is 305 nm
- the average value (m) of the concavo-convex depth (height) is 78.1 nm
- the standard deviation ( ⁇ ) of the concavo-convex depth distribution is The kurtosis of the unevenness was 24.7 nm and ⁇ 0.63.
- the analysis conditions of the atomic force microscope are as follows.
- Measurement mode Dynamic force mode Cantilever: SI-DF40P2 (material: Si, lever width: 40 ⁇ m, tip diameter: 10 nm) Measurement atmosphere: air Measurement temperature: 25 ° C
- a thin nickel layer of about 20 nm was formed as a current seed layer on the surface of the thin film corrugated by the solvent annealing treatment by sputtering.
- the substrate with the thin film was placed in a nickel sulfamate bath, and electrocasting (maximum current density 0.05 A / cm 2 ) was performed at a temperature of 50 ° C. to deposit nickel until the thickness reached 250 ⁇ m.
- the substrate with a thin film was mechanically peeled from the nickel electroformed body thus obtained.
- the nickel electroformed body is immersed in a tetrahydrofuran solvent for 2 hours, and then partially coated on the surface of the electroformed body by repeating the application and curing of an acrylic UV curable resin three times.
- the polymer component that had been removed was removed. Then, it immersed in Nippon CB Chemical's Chemisole 2303, and it wash
- the nickel electroformed body was immersed in HD-2101TH manufactured by Daikin Chemicals Sales Co., Ltd. for about 1 minute, dried, and allowed to stand overnight.
- the nickel electroformed body was immersed in HDTH manufactured by Daikin Chemicals Sales Co., Ltd. and subjected to ultrasonic treatment and washing for about 1 minute.
- a nickel mold subjected to the release treatment was obtained.
- the shape of the irregularities on the surface of the nickel electroformed body was observed using the atomic force microscope.
- the analysis conditions of the atomic force microscope are the same as described above.
- the average height of the unevenness on the thin film surface and the standard deviation of the unevenness height calculated from the unevenness analysis image on the surface of the nickel electroformed body were 45.7 nm and 22.4 nm, respectively.
- a resin substrate with an uneven pattern was produced as follows.
- a fluorine-based UV curable resin is applied on a PET substrate (Toyobo Cosmo Shine A-4100), and the fluorine-based UV curable resin is cured by irradiating ultraviolet rays at 600 mJ / cm 2 while pressing a nickel mold. It was. After the resin was cured, the nickel mold was peeled off from the cured resin. Thus, a diffraction grating composed of a resin substrate with a concavo-convex pattern onto which the surface shape of the nickel mold was transferred was obtained.
- This resin substrate with a concavo-convex pattern can be used as a diffraction grating as it is, but in this example, the resin substrate with a concavo-convex pattern was used again as a mold (diffraction grating mold) to produce a diffraction grating as follows. .
- TEOS tetraethoxysilane
- MTES methyltriethoxysilane
- This doctor blade was designed to have a coating film thickness of 5 ⁇ m, but an imide tape with a thickness of 35 ⁇ m was attached to the doctor blade so that the coating film thickness was adjusted to 40 ⁇ m. After 60 seconds had elapsed after coating, the diffraction grating mold was pressed against the coating film on the glass plate with a pressing roll by the method described below.
- the surface on which the pattern of the diffraction grating mold was formed was pressed against the coating film on the glass substrate while rotating a pressing roll at 23 ° C. from one end of the glass substrate toward the other end.
- the substrate was moved onto a hot plate, and the substrate was heated at 100 ° C. (preliminary firing). After heating was continued for 5 minutes, the substrate was removed from the hot plate, and the diffraction grating mold was manually peeled from the edge from the substrate. Peeling was performed so that the angle (peeling angle) of the diffraction grating mold with respect to the substrate was about 30 °.
- the substrate was baked by heating at 300 ° C. for 60 minutes using an oven. In this way, a diffraction grating having a concavo-convex pattern made of a sol-gel material was obtained.
- a substrate having a thin film corrugated by solvent annealing of the block copolymer thin film obtained as described above (hereinafter referred to as “BCP thin film substrate” as appropriate), a release-molded nickel mold, and a concavo-convex pattern
- BCP thin film substrate A substrate having a thin film corrugated by solvent annealing of the block copolymer thin film obtained as described above
- release-molded nickel mold a release-molded nickel mold
- a concavo-convex pattern A micro-inspection and a macro-inspection for a resin substrate (diffraction grating mold) and a diffraction grating (hereinafter referred to as “sol-gel material substrate” as appropriate) formed with a concavo-convex pattern made of a sol-gel material using the inspection apparatus 102 shown in FIG. Went.
- white LED bar illumination (LNSP-300SW, manufactured by CCS Co., Ltd.) having a light emitting unit area of 21 mm ⁇ 300 mm is used as the micro transmitted light illumination 124. It was installed at a position 20 mm below the conveyance surface. Further, a white LED bar illumination (LNSP-500SW, manufactured by CCS Co., Ltd.) having a light emitting area of 21 mm ⁇ 500 mm was used as the non-transmissive light illumination 126 for micros, and was installed at a position 120 mm above the conveyance surface of the conveyance system 108.
- LNSP-300SW manufactured by CCS Co., Ltd.
- micro camera 122 As the micro camera 122, four 15 ⁇ m / pixel CCD cameras (TL7400-CL, manufactured by Takenaka System Equipment Co., Ltd.) were used, and were installed at a position 65 mm above the conveyance surface of the conveyance system 108. The distance between the microcameras was set to 105 mm.
- a highly directional LED bar illumination (LND-600H-BL, manufactured by CCS Co., Ltd.) having a light emission center wavelength of 460 nm and a light emission unit area of 12 mm ⁇ 600 mm is used as the macro transmitted light illumination 114. And 20 mm below the conveyance surface of the conveyance system 108.
- non-transparent light illumination 116 for macro a highly directional LED bar illumination (LND-600H-BL, manufactured by CCS Co., Ltd.) having a light emission center wavelength of 460 nm and a light emitting part area of 12 mm ⁇ 600 mm is used. It was installed at a position 120 mm above.
- a single 80 ⁇ m / pixel CCD camera manufactured by DALSA, S3-20-02K40 was used as the macro camera 112, and was installed at a position 425 mm above the transport surface of the transport system 108.
- ⁇ Inspection of BCP thin film substrate> The incident angle of light to the BCP thin film substrate at the micro inspection position MI of the micro transmitted light illumination 124, the light receiving angle from the BCP thin film substrate at the micro inspection position MI of the micro camera 122, and the macro inspection of the macro transmitted light illumination 114.
- the incident angle of light to the BCP thin film substrate at the position MA and the light receiving angle from the BCP thin film substrate at the macro inspection position MA of the macro camera 112 were set to 40 °, 60 °, 40 °, and 60 °, respectively.
- a BCP thin film substrate having a size of 420 mm ⁇ 520 mm and a thickness of 2.1 mm is placed on the transport unit 108 of the inspection apparatus 102 and the micro transmitted light illumination 124 is output at 100 W each while transporting in the + Y direction at a speed of 30 mm / s.
- the light was emitted and photographed with the micro camera 122.
- the macro transmitted light illumination 114 was made to emit light at an output of 27 W and photographed by the macro camera 112.
- the imaging frequencies of the micro camera 122 and the macro camera 112 were 2000 Hz and 1625 Hz, respectively.
- gain adjustment was performed so that the pixel values of the micro camera 122 and the macro camera 112 at the micro inspection position MI and the macro inspection position MA were half of the maximum 256, that is, about 128.
- the control system 111 performs bottom hat processing and performs macro unevenness correction on the obtained image from the micro camera 122, and then evaluates the luminance value, so that the average luminance value of the entire screen is 90% or less or 120% or more. If the area of a certain part was 900 ⁇ m 2 or more, the part was determined as a defect.
- the brightness value of the image from the obtained macro camera 112 is evaluated by the control system 111, and if the area of the portion that is 80% or less or 120% or more compared to the pixel value of the non-defective part is less than 1 mm 2 , the brightness It was determined as a good product without unevenness, and when it was 1 mm 2 or more, it was determined as a defective product with uneven brightness.
- the micro inspection there were 108 defects (dark defects) that were 80% or less of the average luminance value of the entire screen, and 13 defects (bright defects) that were 120% or more.
- the result of macro inspection was the normal range of all areas.
- ⁇ Inspection of nickel mold> The incident angle of light on the nickel mold at the micro inspection position MI of the non-transparent light illumination 126 for micro, the light receiving angle from the nickel mold at the micro inspection position MI of the micro camera 122, and the macro inspection of the non-transmissive light illumination 116 for macro.
- the incident angle of light to the nickel mold at the position MA and the light receiving angle from the nickel mold at the macro inspection position MA of the macro camera 112 were set to be 30 °, 60 °, 30 °, and 60 °, respectively.
- a nickel mold having a size of 400 mm ⁇ 500 mm and a thickness of 0.3 mm is installed in the conveyance unit 108 of the inspection apparatus 102, and the non-transmission light illumination 126 for micro is output at 100 W each while conveying in the + Y direction at a speed of 30 mm / s.
- the light was emitted and photographed with the micro camera 122.
- the non-transmissive light illumination 116 for macro light was emitted at 27 W for each output while the nickel mold was transported in the ⁇ Y direction on the transport unit 108 at a speed of 130 mm / s and photographed with the macro camera 112.
- the imaging frequencies of the micro camera 122 and the macro camera 112 were 2000 Hz and 1625 Hz, respectively.
- control system 111 Prior to photographing, gain adjustment was performed so that the pixel values of the micro camera 122 and the macro camera 112 at the micro inspection position MI and the macro inspection position MA were half of the maximum 256, that is, about 128.
- the control system 111 subjects the obtained image from the micro-micro camera 122 to bottom hat processing and macro unevenness correction, and then evaluates the luminance value, and 90% or less or 120% of the average luminance value of the entire screen. If the area of the above portion is 900 ⁇ m 2 or more, the portion was determined as a defect. Further, the luminance value of the image from the obtained macro camera 112 is evaluated by the control system 111.
- the non-defective product is obtained. If it is 1 mm 2 or more, it was determined as a defective product. As a result of the micro inspection, there were 128 defects (dark defects) that were 80% or less of the average luminance value of the entire screen, and 4 defects (bright defects) that were 120% or more. The result of macro inspection was the normal range of all areas.
- ⁇ Inspection of diffraction grating mold The incident angle of light to the diffraction grating mold at the micro inspection position MI of the micro transmitted light illumination 124, the light receiving angle from the diffraction grating mold at the micro inspection position MI of the micro camera 122, and the macro inspection of the macro transmitted light illumination 114.
- the incident angle of light to the diffraction grating mold at the position MA and the light receiving angle from the diffraction grating mold at the macro inspection position MA of the macro camera 112 were set to 40 °, 60 °, 40 °, and 60 °, respectively.
- a diffraction grating mold having a size of 400 mm ⁇ 500 mm and a thickness of 0.1 mm is placed on the transport unit 108 of the inspection apparatus 102, and the micro transmitted light illumination 124 is output at 100 W each while transporting in the + Y direction at a speed of 30 mm / s.
- the light was emitted and photographed with the micro camera 122.
- the macro transmitted light illumination 114 was emitted with an output of 27 W and photographed with the macro camera 112.
- the imaging frequencies of the micro camera 122 and the macro camera 112 were 2000 Hz and 1625 Hz, respectively.
- gain adjustment was performed so that the pixel values of the micro camera 122 and the macro camera 112 at the micro inspection position MI and the macro inspection position MA were half of the maximum 256, that is, about 128.
- the control system 111 performs bottom hat processing and performs macro unevenness correction on the obtained image from the micro camera 122, and then evaluates the luminance value, so that the average luminance value of the entire screen is 90% or less or 120% or more. If the area of a certain part was 900 ⁇ m 2 or more, the part was determined as a defect. Further, the luminance value of the image from the obtained macro camera 112 is evaluated by the control system 111.
- the non-defective product is obtained. If it is 1 mm 2 or more, it was determined as a defective product. As a result of the micro inspection, there were 145 defects (dark defects) that were 80% or less of the average luminance value of the entire screen, and 53 defects (bright defects) that were 120% or more. The result of macro inspection was the normal range of all areas.
- ⁇ Inspection of sol-gel material substrate> The incident angle of light on the sol-gel material substrate at the micro inspection position MI of the micro transmitted light illumination 124, the light receiving angle from the sol-gel material substrate at the micro inspection position MI of the micro camera 122, and the macro inspection of the macro transmitted light illumination 114.
- the incident angle of light to the diffraction grating mold at the position MA and the light receiving angle from the sol-gel material substrate at the macro inspection position MA of the macro camera 112 were set to 40 °, 60 °, 40 °, and 60 °, respectively.
- a sol-gel material substrate having a size of 400 mm ⁇ 500 mm and a thickness of 0.7 mm is placed on the transport unit 108 of the inspection apparatus 102, and the micro transmitted light illumination 124 is output while transporting in the + Y direction at a speed of 30 mm / s (100 W each). ) And emitted light with a micro camera 122. Thereafter, the macro transmissive light illumination 114 was caused to emit light at an output of 27 W while the sol-gel material substrate was transported in the ⁇ Y direction on the transport unit 108 at a speed of 130 mm / s, and was photographed by the macro camera 112.
- the imaging frequencies of the micro camera 122 and the macro camera 112 were 2000 Hz and 1625 Hz, respectively. Met.
- gain adjustment was performed so that the pixel values of the micro camera 122 and the macro camera 112 at the micro inspection position MI and the macro inspection position MA were half of the maximum 256, that is, about 128.
- the obtained image from the micro camera 122 is subjected to macro unevenness correction by bottom hat processing in the control system 111, and then the luminance value is evaluated to be 90% or less or 120% or more of the average luminance value of the entire screen. If the area of the part was 900 ⁇ m 2 or more, the part was determined as a defect. Further, the luminance value of the image from the obtained macro camera 112 is evaluated by the control system 111.
- the non-defective product is obtained. If it is 1 mm 2 or more, it was determined as a defective product. As a result of the micro inspection, there were 183 defects (dark defects) that were 80% or less of the average luminance value of the entire screen, and 54 defects (bright defects) that were 120% or more. The result of macro inspection was the normal range of all areas.
- Example 2 Using the nickel mold produced in Example 1, the incident angle of light to the nickel mold at the micro inspection position MI of the non-transmissive light illumination 126 for micro and the light receiving angle from the nickel mold at the micro inspection position MI of the micro camera 122 are determined. A micro inspection and a macro inspection were performed in the same manner as in Example 1 except for the change. Furthermore, if there is an abnormal part having an area of about 900 ⁇ m 2 or more using the nickel mold, a visual inspection is performed with the part as a defect, and a defect position of micro inspection using the inspection apparatus 102 and a defect position of visual inspection Compared.
- the incident angle of light of the non-transparent light illumination 126 for micro and the light receiving angle of the micro camera 122 are 30 ° and 60 °, respectively, the light entering the camera is diffracted light or scattered light. Since the camera does not receive light, only pattern defects can be detected as dark defects.
- the defects detected when the light incident angle of the non-transmission illumination light 126 for micro and the light receiving angle of the micro camera 122 were 30 ° and 60 ° respectively coincided with the defects detected by visual inspection.
- Example 3 Using the diffraction grating mold produced in Example 1, the incident angle of light of the micro transmitted light illumination 124 and the light receiving angle of the micro camera 122 were changed to the angles shown in Table 1 in the same manner as in Example 1. Micro inspection and macro inspection were performed. The pixel value of the normal part in the micro inspection and the peak level of the 64 ⁇ m ⁇ perfect circular pattern defect part (defect 1) and the 82 ⁇ m ⁇ perfect circular pattern defect part (defect 2) (the pixel value of the defective part in the normal part pixel value) Table 1 shows the value obtained by dividing. In order to detect defects 1 and 2 as defects, it is necessary that the pixel value of the normal part is 120 or more and the peak levels of defects 1 and 2 are 90% or less.
- the pixel value of the normal part is 133, and the peak levels of the defect 1 and the defect 2 are 88% and 82%, respectively.
- defect 1 and defect 2 could be detected.
- the reason why the peak level differs depending on the incident angle and the light receiving angle is considered to be that the diffraction / scattering effect due to the unevenness varies depending on the incident angle and the light receiving angle, and the received light amount also varies accordingly.
- the macro transmitted light illumination 114 is a highly directional LED bar illumination (LND-600H-BL, manufactured by CCS Corporation) having a light emission center wavelength of 460 nm and a light emission area of 12 mm ⁇ 600 mm. Then, micro inspection and macro inspection were performed in the same manner as in Example 1 except that the light emitting area was changed to white LED bar illumination (LNSP-500SW manufactured by CCS Co., Ltd.) having a 21 mm ⁇ 500 mm area. 12A shows a macro inspection image of the sol-gel material substrate when illumination having an emission center wavelength of 460 nm is used as the macro transmitted light illumination 114 in the same manner as in the first embodiment.
- FIG. 12A shows the macro transmitted light illumination 114 in this embodiment.
- FIG. 12B shows a macro inspection image of the sol-gel material substrate when white illumination is used.
- FIG. 12B which is a macro inspection image using white illumination
- scratches / foreign matter are more conspicuous than in FIG. 12A, which is a macro inspection image using illumination with an emission center wavelength of 460 nm, and uneven brightness is observed. It was unclear.
- the inspection apparatus and the inspection method of the present invention and the manufacturing method of the substrate have been specifically described by the embodiments, the present invention is not limited to these embodiments, and various changes and improvements can be made.
- the following modifications of the inspection method may be employed in the inspection method.
- the inspection tact can be shortened by acquiring the data for macro-inspection during the data processing. Macro inspection was performed.
- the macro inspection and the micro inspection may be performed in the reverse order.
- the number of micro cameras 122 may be increased in order to increase the resolution of the micro inspection of the inspection apparatus 102 shown in FIG.
- a plurality of cameras may be arranged in a zigzag pattern without being arranged in a line in a direction orthogonal to the transport direction.
- the resolution can be increased without increasing the number of micro cameras 122 by the following method.
- the camera imaging range is reduced to 1/3 when the lens is attached and detached. Inspection is performed by dividing the camera imaging range at the time of lens attachment / detachment into three divided areas, a first divided area 222a, a second divided area 222b, and a third divided area 222c, in a direction orthogonal to the conveyance direction.
- the substrate P passes through the micro detection position MI by the transport system 108 (see FIG. 2), the substrate P is transported toward the micro detection position MI in the + Y direction at a transport speed of 1/3 when the lens is attached / detached.
- Scattered light from the surface of the P first divided region 222 a is received by the four micro cameras 122. Thereafter, the micro camera 122 is moved stepwise in the X-axis direction by the camera imaging range, and then the substrate P is transported by the transport system 108 toward the micro detection position MI at the transport speed of 1/3 in the ⁇ Y direction. Scattered light from the surface of the second divided region 222b of the substrate P is received by the four micro cameras 122 when passing through the micro detection position MI. After the micro camera 122 is further moved stepwise in the X-axis direction by the camera imaging range, the substrate P is transported by the transport system 108 toward the micro detection position MI at a transport speed of 1/3 in the + Y direction.
- Scattered light from the surface of the third divided region 222c of the substrate P is received by the four micro cameras 122 when passing through the micro detection position MI.
- the intensity of the received light is input to the control system 111 together with the coordinate position in the transport direction of the substrate P.
- the image processing unit 111a the light intensity received from the micro inspection position MI by the four micro cameras 122 is associated with each coordinate position (X coordinate position and Y coordinate position) on the substrate P.
- an image representing the light intensity of the entire substrate P is synthesized by the image processing unit 111a.
- the pixel position of the micro camera 122, the transport direction (Y direction) of the substrate P, and the position in the X direction orthogonal thereto are associated in advance.
- the resolution of the micro inspection can be made three times that when the lens is attached / detached by attaching a lens having a magnification of, for example, three times to the apparatus.
- an organic EL element having a diffraction grating substrate having an irregular concavo-convex surface by associating characteristics of luminance unevenness and micro defects between the organic EL element and a substrate having an irregular concavo-convex surface used therefor Since it is possible to predict the occurrence of uneven brightness and minute defects in the finished product and evaluate the finished product at the manufacturing stage of the substrate, the board that has passed the test by excluding the board that failed the determination of uneven brightness and minute defects By using only this, an organic EL element having uniform illuminance can be manufactured more reliably and with high throughput. Furthermore, even if there is a defect in the uniformity of the illuminance of the organic EL element, it is possible to know whether the defect occurs at the substrate formation stage or the element formation stage. Can do.
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Abstract
Description
第1検出光を前記基板に照射する第1照射系と、
前記第1検出光が照射された前記基板の前記凹凸表面全体から輝度ムラを検出する第1検出系と、
前記第1検出光とは異なる波長を有する第2検出光を前記基板に照射する第2照射系と、
前記第2検出光が照射された前記基板の前記凹凸表面の欠陥を検出する第2検出系とを有することを特徴とする基板の検査装置が提供される。
前記基板の前記凹凸表面全体から輝度ムラを検出する第1検出系及び前記基板の前記凹凸表面の欠陥を検出する第2照射系に対して前記基板を搬送させることと、
前記光非透過性基板が搬送されてきたときに、第1検出光を前記基板の凹凸表面に照射して前記凹凸表面からの光を前記第1検出系により検出し且つ、前記第1検出光とは波長の異なる第2検出光を前記基板の凹凸表面に照射して前記凹凸表面からの光を前記第2検出系により検出し、
前記光透過性基板が搬送されてきたときに、前記第1検出光を前記光透過性基板の凹凸表面とは反対側の面より、前記基板の不規則な凹凸表面に照射して前記凹凸表面からの光を前記第1検出系により検出し且つ、前記第2検出光を前記光透過性基板の前記反対側の面より、前記基板の不規則な凹凸表面に照射して前記凹凸表面からの光を前記第2検出系により検出する検査方法が提供される。
前記不規則な凹凸表面を有する基板を作製することと、
本発明の第1の態様の基板の検査方法を用いて、前記不規則な凹凸表面を有する基板を検査することを含む基板の製造方法が提供される。
本発明の検査方法の概要を、図1のフローチャートに従って説明する。最初に、不規則な凹凸表面を有する基板を作製する(S1)。ここで、「不規則な凹凸表面を有する基板」とは、基板に形成された凹凸のパターンに規則性のない基板、特に、凹凸のピッチが均一ではなく、凹凸の向きに指向性がない基板を意味する。このような基板から散乱及び/または回折される光は、単一のまたは狭い帯域の波長の光ではなく、比較的広域の波長帯を有し、散乱光及び/または回折される光は指向性がなく、あらゆる方向に向かう。但し、上記「不規則な凹凸表面を有する基板」には、表面の凹凸の形状を解析して得られる凹凸解析画像に2次元高速フーリエ変換処理を施して得られるフーリエ変換像が円もしくは円環状の模様を示すような、すなわち、上記凹凸の向きの指向性はないものの凹凸のピッチの分布を有するような疑似周期構造を含む。それゆえ、このような疑似周期構造を有する基板においては、その凹凸ピッチの分布が可視光線を回折する限り、有機EL素子のような面発光素子などに使用される回折基板に好適である。一方で、光記録媒体や磁気記録媒体に見られる記録トラック(グルーブ)の全てが、同一方向に且つ同一ピッチで配列して形成されているような基板は、本願における「不規則な凹凸表面を有する基板」には該当しない。不規則な凹凸表面を有する基板の作製工程の詳細については、後述する。
本発明に従う基板の検査装置について、図2~4を参照しながら説明する。図2(a)に示す検査装置102は、主に、基板Pを搬送方向(図中、矢印Y)の上流側から下流側に搬送する搬送する搬送系108と、マクロ検査部104と、マクロ検査部104よりも下流側に設けられたミクロ検査部106と、それらの制御部111とを備える。本明細書において、検査装置102の搬送方向をY方向、基板面に平行で搬送方向に直交する方向をX方向、基板面に垂直な高さ方向をZ方向とする。搬送系108は、複数のローラ108aが搬送方向に配列されたコンベアであり、幾つかのローラ108aは回転駆動源(不図示)に接続されている駆動ロ-ラであり、基板Pを、ローラ108a上を搬送方向の上流側から下流側に移動させる。搬送系108の搬送方向のほぼ中央部にマクロ検査位置MAとミクロ検査位置MIが存在する。なお、基板の搬送方法はローラによる搬送に限定されず、リニアモーターによる搬送などであってもよい。
次に、検査装置102の動作及び基板の検査方法の一例について説明する。
図4は、検査装置102の上方から見た検査対象である光非透過性基板Pとマクロカメラ112及びミクロカメラ122の配置を示す。この実施形態では、基板Pを検査するときに、最初にミクロ検査部106により微小欠陥の検査を行う。制御系111は、ミクロ用非透過光照明126(図2(a)参照)を点灯するとともに、搬送系108を制御することにより基板Pをミクロ検出位置MIに向かって+Y方向に搬送する。基板Pがミクロ検出位置MIを往路で通過するときに、基板Pの表面からの散乱光を4台のミクロカメラ122により受光する。受光した光の強度は基板Pの搬送方向の座標位置とともに制御系111に入力される。制御系111は画像処理部111aを備え、そこでは基板P上の座標位置(X座標位置とY座標位置)ごとに、4台のミクロカメラ122によりミクロ検査位置MIから受光した光強度を対応付ける。こうして、それらの位置座標ごとの光強度を基に、基板P全体の光の強度を表すミクロ検査画像が画像処理部111aで合成される。なお、ミクロカメラ122の画素位置と基板Pの搬送方向(Y方向)とそれに直交するX方向の位置は予め対応付けられている。
検査対象である基板が光透過性の基板である場合は、ミクロ用非透過光照明126の代わりミクロ用透過光照明124を用い、マクロ用非透過光照明116の代わりにマクロ用透過光照明114を用いる。検査操作は図4に示したのと同様に搬送方向に基板Pを移動しながら、最初にミクロ検査部106により微小欠陥の検査を行う。すなわち、制御系111はミクロ用透過光照明124(図2(a)参照)を点灯するとともに、搬送系108を制御することにより基板Pをミクロ検出位置MIに向かって+Y方向に搬送して、基板Pがミクロ検出位置MIを通過するときに基板Pの表面からの散乱光を4台のミクロカメラ122により受光する。受光した光の強度は基板Pの搬送方向の座標位置とともに制御系111に入力される。制御系111の画像処理部111aでは、基板P上の座標位置(X座標位置とY座標位置)ごとに、4台のミクロカメラ122によりミクロ検査位置MIから受光した光強度を対応付ける。こうして、それらの位置座標ごとの光強度を基に、基板P全体の光の強度を表すミクロ検査画像が画像処理部111aで合成される。合成されたミクロ検査画像の一例を図5(a)に示す。図5(a)は、後述するガラス基板上にゾルゲル材料から形成された凹凸パターンを有する基板から得られたミクロ検査画像である。
上記検査工程で画像処理部111aで合成されたミクロ検査画像の各画素の輝度を制御系111にて評価し、一定輝度より高いもしくは低く、且つ所定の大きさ以上の部位が存在すれば、その部位を欠陥と判定し、欠陥の座標および周辺の画像を制御系111の記憶部111bに格納する。さらに、欠陥が存在する座標をマーカー132に送り、搬送系108とマーカー駆動系132aを駆動して基板Pの欠陥部に相対してマーカー132を移動し、欠陥部に基板の裏面からマーカー132がマークを付す(マーキング工程)。なお、このマーキング工程は必須ではないが、欠陥位置の解析などを行う際に、欠陥部の位置を特定する目的などに有用である。また、上記検査工程で画像処理部111aで合成されたマクロ検査画像の各画素の輝度を制御系111にて評価し、一定輝度より高いもしくは低い部分が一定面積より小さければ良品と判定し、一定面積より大きければ不良品と判定する。
上記判定工程において、輝度ムラ及び欠陥が所望の範囲内であると判定された場合には、この基板を用いて後述のプロセスに従って有機EL素子を製造する。輝度ムラまたは欠陥が所望の範囲外である判定された場合には、後処理を施す。後処理として、基板の欠陥(輝度ムラ)がゴミ、キズ、周期的エラー、ランダムエラーによるものかを分析する。ゴミなどの付着物に起因する場合には、基板表面に加圧エアーを適用して付着物を吹き飛ばすなどしてリペアを行うことができ、その後、再度上記検査を行う。なお、上記検査を複数の基板について連続式またはバッチ式で行う場合には、検査結果に基づいて最小値に対する最大値の比、散乱強度差、もしくは平均ピクセル値が所望の範囲内であるものと範囲外であるものを分別する工程を設けることができる。範囲内であるものについて、例えば、有機EL素子等の製造ラインに供給して有機EL素子を順次製造することができる。範囲外のものについては、まとめて欠陥分析や廃棄を行うことができる。
本発明の検査装置及びそれを用いた検査方法に使用される基板の作製工程について以下に説明する。本発明の検査装置及びそれを用いた検査方法は、例えば、凹凸パターンを有する光透過性基板の生産過程において、そのような光透過性基板を転写プロセスで製造するための光非透過性のモールドやレプリカを作製する工程が存在する場合に有利となる。すなわち、前述のように本発明の検査装置及び検査方法は、検査対象である基板の光の透過特性に応じて照明系を切り替えて、輝度ムラ及びパターン欠陥を検査することができるので、製品となる凹凸パターンを有する光透過性基板のみならず、それを製造するための光非透過性のモールドやレプリカの凹凸パターンのいずれをも検査対象とすることができる。以下に、有機ELの光散乱用基板に用いられる光透過性基板を製造する製造プロセスを例に挙げて説明する。
BCP法による基板の製造について、図6~9を参照しながら説明する。
BCP法に用いるブロック共重合体は、少なくとも、第1のホモポリマーからなる第1のポリマーセグメントと、第1のホモポリマーとは異なる第2のホモポリマーからなる第2のポリマーセグメントとを有する。第2のホモポリマーは、第1のホモポリマーの溶解度パラメーターよりも0.1~10(cal/cm3)1/2高い溶解度パラメーターを有することが望ましい。第1及び第2のホモポリマー溶解度パラメーターの差が0.1(cal/cm3)1/2未満では、ブロック共重合体の規則的なミクロ相分離構造を形成し難たく、前記差が10(cal/cm3)1/2を超える場合はブロック共重合体の均一な溶液を調製することが難しくなる。
HO-(CH2-CH2-O)n-H
[式中、nは10~5000の整数(より好ましくは50~1000の整数、更に好ましくは50~500の整数)を示す。]
で表されるものが好ましい。
BCP法を用いた基板の製造方法に従えば、図6(a)に示すように、上記のように調製したブロック共重合体溶液を基材10上に塗布して薄膜30を形成する。基材10としては特に制限はないが、例えば、ポリイミド、ポリフェニレンスルフィド(PPS)、ポリフェニレンオキシド、ポリエーテルケトン、ポリエチレンナフタレート、ポリエチレンテレフタレート、ポリアリレート、トリアセチルセルロース、ポリシクロオレフィン等の樹脂基板;ガラス、オクタデシルジメチルクロロシラン(ODS)処理ガラス、オクタデシルトリクロロシラン(OTS)処理ガラス、オルガノシリケート処理ガラス、シランカップリング剤で処理したガラス、シリコン基板等の無機基板;アルミニウム、鉄、銅等の金属基板が挙げられる。また、基材10は、配向処理等の表面処理を施したものであってもよい。例えば、オルガノシリケート処理ガラスは、メチルトリメトキシシラン(MTMS)と1,2-ビス(トリメトキシシリル)エタン(BTMSE)のメチルイソブチルケトン(MIBK)溶液をガラスに塗布し、熱処理することで作製することができる。オクタデシルジメチルクロロシラン処理ガラス、オクタデシルトリクロロシラン処理ガラスは、それらのシランのヘプタン溶液中にガラスを漬け置きし、未反応分を後で洗い流すという方法で作製することができる。このようにガラスなどの基板表面をオクタデシルジメチルクロロシランやオルガノシリケートなどのプライマー層で表面処理してもよいし、一般的なシランカップリング剤でシランカップリング処理することにより、ブロック共重合体の基板への密着性を向上することができる。密着性が不十分な場合は電鋳時に剥離してしまい、転写用モールド作製に支障をきたす。なお、このようにガラスなどの基板表面を、ODSやオルガノシリケートなどで処理することで、後述の加熱工程において、ラメラ構造、シリンダー構造、球状構造などのミクロ相分離構造が表面に対して垂直に配列しやすくなる。これはブロック共重合体成分と基材表面との間の界面エネルギー差を小さくすることで、ブロック共重合体を構成する各ブロックのドメインが垂直配向しやすくなるからである。
ブロック共重合体溶液よりなる薄膜30を基材10上に塗布した後に、基材10上の薄膜30を乾燥させる。乾燥は、大気雰囲気中で行うことができる。乾燥温度は、薄膜30から溶媒を除去できる温度であれば特に制限はないが、例えば、10~200℃が好ましく、20~100℃がより好ましい。なお、乾燥により、前記ブロック共重合体がミクロ相分離構造を形成し始めることにより薄膜30の表面に凹凸が見られることがある。
乾燥工程後に、薄膜30をブロック共重合体のガラス転移温度(Tg)以上の温度で加熱する(第1加熱工程またはアニール工程)。この加熱工程(ミクロ相分離構造を生じさせる工程の一例)によってブロック共重合体の自己組織化が進行し、図6(b)に示すようにブロック共重合体が第1ポリマーセグメント32と第2ポリマーセグメント34の部分にミクロ相分離する。加熱温度が、ブロック共重合体のガラス転移温度未満であるとポリマーの分子運動性が低く、ブロック共重合体の自己組織化が十分に進行せず、ミクロ相分離構造を十分に形成できなくなるか、あるいはミクロ相分離構造を十分に生じさせるための加熱時間が長くなる。また、この加熱温度の上限は、前記ブロック共重合体が熱分解しない温度であればよく特に制限はない。第1加熱工程は、オーブンなどを用いて大気雰囲気下で行うことができる。なお、加熱温度を徐々に高めて乾燥及び加熱工程を連続的に行ってもよい。こうすることで乾燥工程は加熱工程に含まれることになる。
第1加熱工程後に、薄膜30のエッチング処理を行う。第1ポリマーセグメント32と第2ポリマーセグメント34は分子構造が相違するため、エッチングされ易さも異なる。それゆえ、それらのポリマーセグメント、すなわちホモポリマーの種類に応じたエッチング処理によりブロック共重合体を構成する一方のポリマーセグメント(第2ポリマーセグメント34)を選択的に除去することができる。図6(c)に示すように、エッチング処理によりミクロ相分離構造から第2ポリマーセグメント34が除去され、塗膜に顕著な凹凸構造が現れる。前記エッチング処理としては、例えば、反応性イオンエッチング法、オゾン酸化法、加水分解法、金属イオン染色法、紫外線エッチング法等を用いたエッチング法を採用することができる。また、前記エッチング処理として、前記ブロック共重合体の共有結合を酸、塩基及び還元剤からなる群から選択される少なくとも1種で処理して前記共有結合を切断し、その後、一方のポリマーセグメントだけを溶解する溶媒等でミクロ相分離構造が形成された塗膜を洗浄することにより、ミクロ相分離構造を保ったまま、一方のポリマーセグメントのみを除去する方法を採用してもよい。後述する実施形態においては、操作の容易性などの観点から紫外線エッチングを用いた。
上記エッチング工程により得られた薄膜30の凹凸構造36に第2の加熱またはアニール処理を施す。第2の加熱処理における加熱温度は、エッチング後に残留した第1ポリマーセグメント32のガラス転移温度以上、すなわち、第1ホモポリマーのガラス転移温度以上であることが望ましく、例えば、第1ホモポリマーのガラス転移温度以上で且つ第1ホモポリマーのガラス転移温度より70℃高い温度以下であることが望ましい。この加熱温度が、第1ホモポリマーのガラス転移温度未満であると、電鋳後に所望の凹凸構造、すなわち、なめらかな山形構造が得られないか、あるいは加熱に長時間を要することになる。第1ホモポリマーのガラス転移温度よりかなり高いと第1ポリマーセグメント32が溶融したり、形状が大きく崩れるので好ましくない。この点でガラス転移温度~ガラス転移温度より70℃程度の範囲で加熱するのが望ましい。第2の加熱処理も第1の加熱処理と同様に、オーブン等を用いて大気雰囲気下で行うことができる。
前述の乾燥工程後に、薄膜30を有機溶媒蒸気の雰囲気下で溶媒アニール(溶媒相分離)処理して、ブロック共重合体の相分離構造を薄膜30内に形成させる。この溶媒アニール処理によってブロック共重合体の自己組織化が進行し、図7(a)に示すようにブロック共重合体が第1ポリマーセグメント32と第2ポリマーセグメント34の部分にミクロ相分離する。
上記のようにして第2加熱工程で得られたマスターの山形構造38または溶媒アニール工程で得られた波形構造38aの表面に、図8(a)に示すように、後続の電鋳処理のための導電層となるシード層40を形成する。シード層40は、無電解めっき、スパッタまたは蒸着により形成することができる。シード層40の厚みとして、後続の電鋳工程における電流密度を均一にして後続の電鋳工程により堆積される金属層の厚みを一定にするために、10nm以上が好ましく、より好ましくは20nm以上である。シード層の材料として、例えば、ニッケル、銅、金、銀、白金、チタン、コバルト、錫、亜鉛、クロム、金・コバルト合金、金・ニッケル合金、ホウ素・ニッケル合金、はんだ、銅・ニッケル・クロム合金、錫ニッケル合金、ニッケル・パラジウム合金、ニッケル・コバルト・リン合金、またはそれらの合金などを用いることができる。なお、シード層は、図6(c)に示したような複雑な断面構造に比べて、図6(d)あるいは図7(a)および(b)に示したような山形あるいは波形の比較的滑らかな構造により漏れなくしかもより均一な厚みで付着すると考えられる。
上記のようにして得られたシード層40を含む金属層50を、凹凸構造を有する基材から剥離してファザーとなる金属基板を得る。剥離方法は物理的に剥がしても構わないし、第1ホモポリマー及び残留するブロック共重合体を、それらを溶解する有機溶媒、例えば、トルエン、テトラヒドロフラン(THF)、クロロホルムなどを用いて溶解して除去してもよい。
上記のように金属基板70を山型構造38または波形構造38aを有する基材10から剥離するときに、図8(c)に示すように、第1ポリマーセグメントや第2ポリマーセグメントのようなポリマーの一部60が金属基板70に残留する場合がある。このような場合には、それらの残留した部分60を洗浄にて除去することができる。洗浄方法としては、湿式洗浄や乾式洗浄を用いることができる。湿式洗浄としてはトルエン、テトラヒドロフラン等の有機溶剤、界面活性剤、アルカリ系溶液での洗浄などにより除去することができる。有機溶剤を用いる場合には、超音波洗浄を行ってもよい。また電解洗浄を行うことにより除去しても良い。乾式洗浄としては、紫外線やプラズマを使用したアッシングにより除去することができる。湿式洗浄と乾式洗浄を組み合わせて用いてもよい。このような洗浄後に、純水や精製水でリンスし、乾燥後にオゾン照射してもよい。こうして所望の凹凸構造を有する金属基板(モールド)70が得られる(図8(d))。この金属基板70は、光非透過性基板として本発明の検査装置及び検査方法の検査対象となる。
モールドとしての金属基板70を用いてその凹凸構造を樹脂に転写する際に、樹脂からの離型を向上させるために金属基板70に離型処理を行っても良い。離型処理としては、表面エネルギーを下げる処方が一般的であり、特に制限はないが、フッ素系の材料やシリコーン樹脂等の離型剤72を図9(a)に示すように金属基板70の凹凸表面70aにコーティングしたり、フッ素系のシランカップリング剤で処理する方法、ダイヤモンドライクカーボンを表面に成膜することなどが挙げられる。
得られた金属基板70を用いて、金属基板の凹凸構造(パターン)を樹脂層80に転写することでマザーを製造する。この転写処理の方法として、図9(b)に示すように、例えば、硬化性樹脂を透明支持基板90に塗布した後、金属基板70の凹凸構造を樹脂層80に押し付けつつ樹脂層80を硬化させる。透明支持基板90として、例えば、ガラス等の透明無機材料からなる基材;ポリエチレンテレフタレート(PET)、ポリエチレンテレナフタレート(PEN)、ポリカーボネート(PC)、シクロオレフィンポリマー(COP)、ポリメチルメタクリレート(PMMA)、ポリスチレン(PS)等の樹脂からなる基材;これらの樹脂からなる基材の表面にSiN、SiO2、SiC、SiOxNy、TiO2、Al2O3等の無機物からなるガスバリア層を形成してなる積層基材;これらの樹脂からなる基材及びこれらの無機物からなるガスバリア層を交互に積層してなる積層基材が挙げられる。また、透明支持基板の厚みは、1~500μmの範囲にし得る。
BKL法は、WO2011/007878A1に詳しく記載されているように、70℃以上の温度条件下において、熱により体積が変化するポリマーからなるポリマー膜の表面に蒸着膜を形成した後、前記ポリマー膜及び前記蒸着膜を冷却することにより、前記蒸着膜の表面に皺による凹凸を形成する工程(凹凸形状形成工程)と、前記蒸着膜上に母型材料を付着させ硬化させた後に、硬化後の母型材料を前記蒸着膜から取り外して母型を得る工程(母型形成工程)とを含む。
次に、BCP法やBKL法に例示されるような方法を用いて得られた樹脂フィルム構造体(または、ガラス基板またはゾルゲル材料で凹凸が形成されたゾルゲル構造体)のうち、前記の判定工程で合格した基板を用いて有機EL素子を製造する。この製造方法のうち、樹脂フィルム構造体100からなる回折格子について、図11を参照しながら説明する。
この実施例では、不規則な凹凸表面を有する基板として有機EL素子に用いられる回折格子基板を作製する。
<回折格子モールドの作製>
下記のようなポリスチレン(以下、適宜「PS」と略する)とポリメチルメタクリレート(以下、適宜「PMMA」と略する)とからなるPolymer Source社製のブロック共重合体を用意した。
PSセグメントのMn=750,000、
PMMAセグメントのMn=720,000、
ブロック共重合体のMn=1,470,000、
PSセグメントとPMMAセグメントの体積比(PS:PMMA)=54:46、
分子量分布(Mw/Mn)=1.21、PSセグメントのTg=107℃、
PMMAセグメントのTg=134℃
カンチレバー:SI-DF40P2(材質:Si、レバー幅:40μm、チップ先端の直径:10nm)
測定雰囲気:大気中
測定温度:25℃
ミクロ用透過光照明124のミクロ検査位置MIにおけるBCP薄膜基板への光の入射角と、ミクロカメラ122のミクロ検査位置MIにおけるBCP薄膜基板からの受光角と、マクロ用透過光照明114のマクロ検査位置MAにおけるBCP薄膜基板への光の入射角と、マクロカメラ112のマクロ検査位置MAにおけるBCP薄膜基板からの受光角がそれぞれ40°、60°、40°、60°になるように設置した。大きさ420mm×520mmで厚さ2.1mmのBCP薄膜基板を検査装置102の搬送部108に設置し、速度30mm/sで+Y方向に搬送しながら、ミクロ用透過光照明124を出力各100Wで発光させ、ミクロカメラ122で撮影した。その後、前記BCP薄膜基板を速度130mm/sで搬送部108上を-Y方向に搬送しながら、マクロ用透過光照明114を出力各27Wで発光させ、マクロカメラ112で撮影した。ミクロカメラ122及びマクロカメラ112の撮像周波数はそれぞれ2000Hz及び1625Hzであった。また、撮影前に、ミクロ検査位置MIおよびマクロ検査位置MAにおけるミクロカメラ122およびマクロカメラ112のピクセル値が最大の256の半分、すなわち128程度になるようにゲイン調整をおこなった。得られたミクロカメラ122からの像について制御系111にて、ボトムハット処理をかけマクロムラ補正をかけた後、輝度値の評価を行い、全画面の平均輝度値の90%以下もしくは120%以上である部分の面積が900μm2以上であればその部位を欠陥と判定した。また、得られたマクロカメラ112からの像の輝度値を制御系111にて評価し、良品部のピクセル値に比べ80%以下もしくは120%以上である部分の面積が1mm2未満であれば輝度ムラがない良品と判定し、1mm2以上であれば輝度ムラがある不良品と判定した。ミクロ検査の結果、全画面の平均輝度値の80%以下となる欠陥(暗欠陥)が108個、120%以上となる欠陥(明欠陥)が13個存在した。マクロ検査の結果は全エリア正常範囲であった。
ミクロ用非透過光照明126のミクロ検査位置MIにおけるニッケルモールドへの光の入射角と、ミクロカメラ122のミクロ検査位置MIにおけるニッケルモールドからの受光角と、マクロ用非透過光照明116のマクロ検査位置MAにおけるニッケルモールドへの光の入射角と、マクロカメラ112のマクロ検査位置MAにおけるニッケルモールドからの受光角をそれぞれ30°、60°、30°、60°になるように設置した。大きさ400mm×500mm、厚さ0.3mmのニッケルモールドを検査装置102の搬送部108に設置し、速度30mm/sで+Y方向に搬送しながら、ミクロ用非透過光照明126を出力各100Wで発光させ、ミクロカメラ122で撮影した。その後、前記ニッケルモールドを速度130mm/sで搬送部108上を-Y方向に搬送しながら、マクロ用非透過光照明116を出力各27Wで発光させ、マクロカメラ112で撮影した。ミクロカメラ122及びマクロカメラ112の撮像周波数はそれぞれ2000Hz及び1625Hzであった。また、撮影前に、ミクロ検査位置MIおよびマクロ検査位置MAにおけるミクロカメラ122およびマクロカメラ112のピクセル値が最大の256の半分、すなわち128程度になるようにゲイン調整をおこなった。得られたミ
μクロカメラ122からの像について制御系111にて、ボトムハット処理をかけマクロムラ補正をかけた後、輝度値の評価を行い、全画面の平均輝度値の90%以下もしくは120%以上である部分の面積が900μm2以上であればその部位を欠陥と判定した。また、得られたマクロカメラ112からの像の輝度値を制御系111にて評価し、良品部のピクセル値に比べ80%以下もしくは120%以上である部分の面積が1mm2未満であれば良品と判定し、1mm2以上であれば不良品と判定した。ミクロ検査の結果は全画面の平均輝度値の80%以下となる欠陥(暗欠陥)が128個、120%以上となる欠陥(明欠陥)が4個存在した。マクロ検査の結果は全エリア正常範囲であった。
ミクロ用透過光照明124のミクロ検査位置MIにおける回折格子モールドへの光の入射角と、ミクロカメラ122のミクロ検査位置MIにおける回折格子モールドからの受光角と、マクロ用透過光照明114のマクロ検査位置MAにおける回折格子モールドへの光の入射角と、マクロカメラ112のマクロ検査位置MAにおける回折格子モールドからの受光角がそれぞれ40°、60°、40°、60°になるように設置した。大きさ400mm×500mm、厚さ0.1mmの回折格子モールドを検査装置102の搬送部108に設置し、速度30mm/sで+Y方向に搬送しながら、ミクロ用透過光照明124を出力各100Wで発光させ、ミクロカメラ122で撮影した。その後、前記回折格子モールドを速度130mm/sで搬送部108上を-Y方向に搬送しながら、マクロ用透過光照明114を出力各27Wで発光させ、マクロカメラ112で撮影した。ミクロカメラ122及びマクロカメラ112の撮像周波数はそれぞれ2000Hz及び1625Hzであった。また、撮影前に、ミクロ検査位置MIおよびマクロ検査位置MAにおけるミクロカメラ122およびマクロカメラ112のピクセル値が最大の256の半分、すなわち128程度になるようにゲイン調整をおこなった。得られたミクロカメラ122からの像について制御系111にて、ボトムハット処理をかけマクロムラ補正をかけた後、輝度値の評価を行い、全画面の平均輝度値の90%以下もしくは120%以上である部分の面積が900μm2以上であればその部位を欠陥と判定した。また、得られたマクロカメラ112からの像の輝度値を制御系111にて評価し、良品部のピクセル値に比べ80%以下もしくは120%以上である部分の面積が1mm2未満であれば良品と判定し、1mm2以上であれば不良品と判定した。ミクロ検査の結果は全画面の平均輝度値の80%以下となる欠陥(暗欠陥)が145個、120%以上となる欠陥(明欠陥)が53個存在した。マクロ検査の結果は全エリア正常範囲であった。
ミクロ用透過光照明124のミクロ検査位置MIにおけるゾルゲル材料基板への光の入射角と、ミクロカメラ122のミクロ検査位置MIにおけるゾルゲル材料基板からの受光角と、マクロ用透過光照明114のマクロ検査位置MAにおける回折格子モールドへの光の入射角と、マクロカメラ112のマクロ検査位置MAにおけるゾルゲル材料基板からの受光角がそれぞれ40°、60°、40°、60°になるように設置した。大きさ400mm×500mm、厚さ0.7mmのゾルゲル材料基板を検査装置102の搬送部108に設置し、速度30mm/sで+Y方向に搬送しながら、ミクロ用透過光照明124を出力(各100W)で発光させ、ミクロカメラ122で撮影した。その後、前記ゾルゲル材料基板を速度130mm/sで搬送部108上を-Y方向に搬送しながら、マクロ用透過光照明114を出力各27Wで発光させ、マクロカメラ112で撮影した。ミクロカメラ122及びマクロカメラ112の撮像周波数はそれぞれ2000Hz及び1625Hzであった。であった。また、撮影前に、ミクロ検査位置MIおよびマクロ検査位置MAにおけるミクロカメラ122およびマクロカメラ112のピクセル値が最大の256の半分、すなわち128程度になるようにゲイン調整をおこなった。得られたミクロカメラ122からの像について制御系111にて、ボトムハット処理によるマクロムラ補正をかけた後、輝度値の評価を行い、全画面の平均輝度値の90%以下もしくは120%以上である部分の面積が900μm2以上であればその部位を欠陥と判定した。また、得られたマクロカメラ112からの像の輝度値を制御系111にて評価し、良品部のピクセル値に比べ80%以下もしくは120%以上である部分の面積が1mm2未満であれば良品と判定し、1mm2以上であれば不良品と判定した。ミクロ検査の結果は全画面の平均輝度値の80%以下となる欠陥(暗欠陥)が183個、120%以上となる欠陥(明欠陥)が54個存在した。マクロ検査の結果は全エリア正常範囲であった。
実施例1で作製したニッケルモールドを用いて、ミクロ用非透過光照明126のミクロ検査位置MIにおけるニッケルモールドへの光の入射角とミクロカメラ122のミクロ検査位置MIにおけるニッケルモールドからの受光角を変更した以外は実施例1と同様にして、ミクロ検査およびマクロ検査を行った。さらに、前記ニッケルモールドを用いて、900μm2程度以上の面積を有する異常箇所があればその部位を欠陥とする目視検査を行い、検査装置102を用いたミクロ検査の欠陥位置と目視検査の欠陥位置を比較した。ミクロ用非透過光照明126の光の入射角及びミクロカメラ122の受光角の両方が60°のときは、検査装置による検査と目視検査の欠陥位置が殆ど一致しなかった。一方、ミクロ用非透過光照明126の光の入射角及びミクロカメラ122の受光角がそれぞれ30°及び60°のときは、検査装置による検査でのみ検出された欠陥が31箇所、目視検査でのみ検出された欠陥が26箇所あったが、検査装置による検査と目視検査の両方で検出された欠陥が195箇所あった。このことから、ミクロ用非透過光照明126の光の入射角及びミクロカメラ122の受光角がそれぞれ30°及び60°のときには、実際の欠陥を反映した検査がなされていることが分かる。これは、ミクロ用非透過光照明126の光の入射角及びミクロカメラ122の受光角の両方が60°のときはカメラに入ってくる光はほぼ正反射光であり、異物等が存在すると暗欠点部として現れるためパターン欠陥と異物を区別することができない。一方、ミクロ用非透過光照明126の光の入射角及びミクロカメラ122の受光角がそれぞれ30°及び60°のときはカメラに入ってくる光は回折光もしくは散乱光であり、正反射光をカメラが受光しないためにパターン欠陥のみを暗欠点部として検知することができる。ミクロ用非透過光照明126の光の入射角及びミクロカメラ122の受光角がそれぞれ30°及び60°のときに検出された欠陥は目視検査でとらえている欠陥と一致していた。
実施例1で作製した回折格子モールドを用いて、ミクロ用透過光照明124の光の入射角とミクロカメラ122の受光角を表1に示した角度に変更した以外は実施例1と同様にして、ミクロ検査及びマクロ検査を行った。ミクロ検査における正常部のピクセル値と、64μmφの真円状パターン欠陥部位(欠陥1)と82μmφの真円状パターン欠陥部位(欠陥2)のピークレベル(正常部のピクセル値で欠陥部位のピクセル値を割った値)を表1に示す。欠陥1と2を欠陥として検出するためには、正常部のピクセル値が120以上かつ欠陥1及び2のピークレベルが90%以下が必要となる。ミクロ用透過光照明124の光の入射角が40°、ミクロカメラ122の受光角が30°としたとき正常部のピクセル値が133、欠陥1及び欠陥2のピークレベルがそれぞれ88%、82%となり、欠陥1及び欠陥2を検出することができた。このように入射角及び受光角によって、ピークレベルが異なるのは、入射角及び受光角により凹凸による回折・散乱効果が異なり、それにより受光量も異なるからであると考えられる。
実施例1で作製したゾルゲル材料基板を用いて、マクロ用透過光照明114を発光中心波長460nm、発光部面積12mm×600mmの高指向性LEDバー照明(CCS株式会社製、LND-600H-BL)から、発光部面積が21mm×500mmの白色LEDバー照明(CCS株式会社製、LNSP-500SW)に変更した以外は実施例1と同様にして、ミクロ検査及びマクロ検査を行った。実施例1と同様にしてマクロ用透過光照明114に発光中心波長460nmの照明を使用したときのゾルゲル材料基板のマクロ検査画像を図12(a)に、本実施例でマクロ用透過光照明114に白色照明を使用したときのゾルゲル材料基板のマクロ検査画像を図12(b)に示す。白色照明を使用したマクロ検査画像である図12(b)の方が、発光中心波長460nmの照明を使用したマクロ検査画像である図12(a)よりも傷・異物が目立ち、輝度のムラが不明瞭だった。
11 陽極バッファー層、12 正孔輸送層、13 電子輸送層
27 ポリマー膜、28 蒸着膜、29 母型材料、30 薄膜
32 第1ポリマーセグメント、34 第2ポリマーセグメント
36 凹凸構造、38 山形構造、 38a 波形構造
40 シード層、50 金属層、60 残留したポリマーの一部
70 金属基板(モールド)、70a 凹凸表面
72 離型剤、80 硬化樹脂層、82 硬化樹脂層、
90 透明支持基板、100 樹脂フィルム構造体
110 レプリカ
102 検査装置、104 マクロ検査部、106 ミクロ検査部
108 搬送系、108a ローラ
111 制御部、111a 画像処理部、111b 記憶部
112 マクロカメラ、112a 移動ステージ、112b アーム
112c ステージベース
114 マクロ用透過光照明、114a 回転軸、114b 支持台
116 マクロ用非透過光照明、116a ガイド
122 ミクロカメラ、122a 移動ステージ、 122b アーム
122c ステージベース、124 ミクロ用透過光照明、124a 回転軸、
124b 支持台、126 ミクロ用非透過光照明、 126a ガイド、
130 支持台、 132 マーカー、 132a 制御系
222a 第1分割領域、222b 第2分割領域
222c 第3分割領域、 400 有機EL素子
Claims (22)
- 光を散乱する不規則な凹凸表面を有する基板を検査する装置であって、
第1検出光を前記基板に照射する第1照射系と、
前記第1検出光が照射された前記基板の前記凹凸表面全体から輝度ムラを検出する第1検出系と、
前記第1検出光とは異なる波長を有する第2検出光を前記基板に照射する第2照射系と、
前記第2検出光が照射された前記基板の前記凹凸表面の欠陥を検出する第2検出系とを有することを特徴とする基板の検査装置。 - 前記第1検出光が青色光であり、前記第2検出光が白色光であることを特徴とする請求項1に記載の基板の検査装置。
- 前記第1照射系が、光透過性基板を照明するための透過光照明及び光非透過性基板を照明するための非透過光照明を備え、前記第2照射系が、光透過性基板を照明するための透過光照明及び光非透過性基板を照明するための非透過光照明を備えることを特徴とする請求項1または2に記載の基板の検査装置。
- 前記第1照射系の非透過光照明及び前記第2照射系の非透過光照明は、前記基板の不規則な凹凸表面を照明し、前記第1照射系の透過光照明及び前記第2照射系の透過光照明は、前記基板の不規則な凹凸表面と反対側の面より、前記基板の不規則な凹凸表面を照明することを特徴とする請求項3に記載の基板の検査装置。
- 前記第1検出系が、前記第1照射系の透過光照明により照明された光透過性基板からの光と、前記第1照射系の非透過光照明により照明された光非透過性基板からの光を検出するカメラを備えることを特徴とする請求項3または4に記載の基板の検査装置。
- 前記第2検出系が、前記第2照射系の透過光照明により照明された前記光透過性基板からの光と、前記第2照射系の非透過光照明により照明された前記光非透過性基板からの光を検出するカメラを備えることを特徴とする請求項5に記載の基板の検査装置。
- 前記第2検出系のカメラの解像度が、前記第1検出系のカメラの解像度よりも高いことを特徴とする請求項6に記載の基板の検査装置。
- 前記第2検出系のカメラが、前記基板の分割されたエリアをそれぞれ検出する複数のカメラを含むことを特徴とする請求項6または7に記載の基板の検査装置。
- 前記第1照射系及び前記第2照射系は、所定方向に延在するライン状照明であり、さらに、前記基板を前記所定方向と直交する方向に搬送する基板搬送系を備えることを特徴とする請求項1~8のいずれか一項に記載の基板の検査装置。
- さらに、前記基板搬送系、前記第1照射系、前記第2照射系、前記第1検出系及び前記第2検出系を制御する制御系を備え、前記制御系は、前記基板搬送系により前記基板が前記第1照射系、前記第2照射系、前記第1検出系及び前記第2検出系に対して一方向に移動しているときに前記凹凸表面の欠陥を検出し、前記第1照射系、前記第2照射系、前記第1検出系及び前記第2検出系に対して前記一方向と逆の方向に移動しているときに輝度ムラを検出することを特徴とする請求項9に記載の基板の検査装置。
- 前記制御系は、前記凹凸表面の欠陥及び輝度ムラが、所定の許容範囲内にあるか否かを判定することを特徴とする請求項10に記載の基板の検査装置。
- 光を散乱する不規則な凹凸表面を有する光非透過性基板と、光を散乱する不規則な凹凸表面を有する光透過性基板を検査する基板の検査方法であって、
前記基板の前記凹凸表面全体から輝度ムラを検出する第1検出系及び前記基板の前記凹凸表面の欠陥を検出する第2照射系に対して前記基板を搬送させることと、
前記光非透過性基板が搬送されてきたときに、第1検出光を前記基板の凹凸表面に照射して前記凹凸表面からの光を前記第1検出系により検出し且つ、前記第1検出光とは波長の異なる第2検出光を前記基板の凹凸表面に照射して前記凹凸表面からの光を前記第2検出系により検出することと、
前記光透過性基板が搬送されてきたときに、前記第1検出光を前記光透過性基板の凹凸表面とは反対側の面より、前記基板の不規則な凹凸表面に照射して前記凹凸表面からの光を前記第1検出系により検出し且つ、前記第2検出光を前記光透過性基板の前記反対側の面より、前記基板の不規則な凹凸表面に照射して前記凹凸表面からの光を前記第2検出系により検出することとを含むことを特徴とする基板の検査方法。 - 前記第1検出光が青色光であり、前記第2検出光が白色光であることを特徴とする請求項12に記載の基板の検査方法。
- 前記第1照射系と前記第2照射系のいずれも所定方向に延在するライン状照明であり、前記基板を搬送することが、前記基板を前記所定方向と直交する方向に搬送することを特徴とする請求項12または13に記載の基板の検査方法。
- 前記基板を前記第1検出系及び第2検出系に対して一方向に移動しているときに前記基板の前記凹凸表面の欠陥を検出し、前記基板を前記第1検出系及び第2検出系に対して前記一方向と逆の方向に移動しているときに前記基板の輝度ムラを検出することを特徴とする請求項12~14のいずれか一項に記載の基板の検査方法。
- さらに、前記凹凸表面の欠陥及び輝度ムラが、所定の許容範囲内にあるか否かを判定することを含むことを特徴とする請求項12~15のいずれか一項に記載の基板の検査方法。
- 光を散乱する不規則な凹凸表面を有する基板を製造する方法であって、
前記不規則な凹凸表面を有する基板を作製することと、
請求項12~16のいずれか一項に記載の基板の検査方法を用いて前記不規則な凹凸表面を有する基板を検査することを含む基板の製造方法。 - 前記不規則な凹凸表面を有する基板を作製することが、不規則な凹凸パターンを有する光非透過性基板を作製し、前記光非透過性基板の前記不規則な凹凸パターンを転写することを含む請求項17に記載の基板の製造方法。
- 前記不規則な凹凸表面を有する基板を作製することが、ブロック共重合体の相分離を利用することを含む請求項17または18に記載の基板の製造方法。
- 前記不規則な凹凸表面が、金属、樹脂またはゾルゲル材料から形成されている請求項17~19のいずれか一項に記載の基板の製造方法。
- 有機EL素子の製造方法であって、請求項17~20のいずれか一項に記載の基板を製造する方法を用いて凹凸表面を有する回折格子基板を作製することと、前記回折格子基板の凹凸表面上に、透明電極、有機層及び金属電極を、順次積層することとを含むことを特徴とする有機EL素子の製造方法。
- 前記基板の検査方法が、前記凹凸表面の欠陥及び輝度ムラが、所定の許容範囲内にあるか否かを判定することを含み、前記作製した回折格子基板の輝度ムラと欠陥が所定の許容範囲内であると判定された場合にのみ、当該回折格子基板の凹凸表面上に、前記透明電極、前記有機層及び前記金属電極を、順次積層する請求項21に記載の有機EL素子の製造方法。
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CA2886007A CA2886007C (en) | 2012-09-28 | 2013-09-13 | Device for inspecting substrate having irregular rough surface and inspection method using same |
EP13842404.9A EP2903397A4 (en) | 2012-09-28 | 2013-09-13 | DEVICE FOR INSPECTING A SUBSTRATE HAVING AN IRREGULAR ROUGH SURFACE AND INSPECTION METHOD USING THE SAME |
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KR1020157006649A KR101683706B1 (ko) | 2012-09-28 | 2013-09-13 | 불규칙한 요철 표면을 가지는 기판을 검사하는 장치 및 이것을 사용한 검사 방법 |
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KR101726413B1 (ko) * | 2016-10-13 | 2017-04-13 | 주식회사 디이엔티 | 패널 얼룩 검사 장치 |
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JP2016115917A (ja) * | 2014-12-12 | 2016-06-23 | 王子ホールディングス株式会社 | 半導体発光素子用基板、および、半導体発光素子 |
KR101726413B1 (ko) * | 2016-10-13 | 2017-04-13 | 주식회사 디이엔티 | 패널 얼룩 검사 장치 |
WO2022113852A1 (ja) * | 2020-11-27 | 2022-06-02 | 富士フイルム株式会社 | 外観検査装置、外観検査方法、及び外観検査プログラム |
JP2022123932A (ja) * | 2021-02-15 | 2022-08-25 | プライムプラネットエナジー&ソリューションズ株式会社 | ナノ突起構造体検査装置およびナノ突起構造体検査方法 |
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CA2886007C (en) | 2016-10-11 |
AU2013321411A1 (en) | 2015-05-07 |
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US9310319B2 (en) | 2016-04-12 |
JP5707541B2 (ja) | 2015-04-30 |
TWI593957B (zh) | 2017-08-01 |
JPWO2014050609A1 (ja) | 2016-08-22 |
AU2013321411B2 (en) | 2017-04-20 |
US20150192529A1 (en) | 2015-07-09 |
KR101683706B1 (ko) | 2016-12-07 |
EP2903397A1 (en) | 2015-08-05 |
CN104685970A (zh) | 2015-06-03 |
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KR20150040366A (ko) | 2015-04-14 |
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