WO2022157895A1 - レジストパターンの検査方法、レジストパターンの製造方法、基板選別方法、及びプリント配線板の製造方法 - Google Patents
レジストパターンの検査方法、レジストパターンの製造方法、基板選別方法、及びプリント配線板の製造方法 Download PDFInfo
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- WO2022157895A1 WO2022157895A1 PCT/JP2021/002093 JP2021002093W WO2022157895A1 WO 2022157895 A1 WO2022157895 A1 WO 2022157895A1 JP 2021002093 W JP2021002093 W JP 2021002093W WO 2022157895 A1 WO2022157895 A1 WO 2022157895A1
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- resist pattern
- substrate
- color
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G—PHYSICS
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- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- 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
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
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- 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
- G01N2021/95638—Inspecting patterns on the surface of objects for PCB's
Definitions
- the present disclosure relates to a resist pattern inspection method, a resist pattern manufacturing method, a board sorting method, and a printed wiring board manufacturing method.
- a photosensitive layer is laminated on the board.
- actinic rays are applied to predetermined portions of the photosensitive layer through a photomask to cure the exposed portions.
- the unexposed portion of the photosensitive layer is removed with a developer to form a resist pattern on the substrate.
- the substrate on which the resist pattern is formed is etched or plated to form a conductive pattern on the substrate, and finally the cured portion of the photosensitive layer (resist pattern) is removed from the substrate. Peel off.
- an object of the present disclosure is to provide a resist pattern inspection method, a resist pattern manufacturing method, a board sorting method, and a printed wiring board manufacturing method that can evaluate a resist pattern with high precision in a short time.
- the resist pattern inspection method of the present disclosure includes a visual inspection step of visually inspecting the resist pattern based on reflected light from the substrate on which the resist pattern is formed.
- the appearance of the resist pattern is inspected based on the light reflected from the substrate on which the resist pattern is formed. can be detected.
- the contour of the resist pattern may be detected based on the reflected light from the substrate, and the resist pattern may be visually inspected based on the detected contour.
- the appearance of the resist pattern can be appropriately inspected by utilizing the outline of the resist pattern detected based on the reflected light from the substrate.
- the detected contour may be compared with pattern data for forming a resist pattern.
- defects in the resist pattern can be detected with high accuracy by comparing the detected outline with pattern data for forming the resist pattern as the appearance inspection of the resist pattern.
- the line width of the resist pattern may be measured based on the detected contour.
- the resist pattern formation state can be evaluated by measuring the line width of the resist pattern based on the detected contour as the appearance inspection of the resist pattern.
- a resist pattern forming step of forming a resist pattern on the substrate, and a coloring step of coloring the resist pattern after the resist pattern forming step may be further provided.
- the resist pattern is formed on the substrate and then colored to reduce the transmittance. increase the contrast between Therefore, it is possible to improve the detection accuracy of the outline of the resist pattern based on the reflected light from the substrate.
- the resist pattern may be exposed to color in order to develop the color of the resist pattern.
- this resist pattern inspection method by exposing the resist pattern to color the resist pattern, it is possible to improve the detection accuracy of the outline of the resist pattern based on the reflected light from the substrate.
- the resist pattern may be heated in order to develop the color of the resist pattern.
- this resist pattern inspection method by heating the resist pattern to develop a color, the accuracy of detection of the outline of the resist pattern based on the reflected light from the substrate can be improved.
- the temperature of the resist pattern may be set to 35° C. or more and 150° C. or less in order to color the resist pattern.
- the temperature of the resist pattern is set to 35° C. or higher and 150° C. or lower to cause the resist pattern to develop a color, thereby increasing the detection accuracy of the outline of the resist pattern based on the light reflected from the substrate.
- the resist pattern may be dyed in order to color the resist pattern.
- this resist pattern inspection method by dyeing the resist pattern to develop a color, it is possible to improve the detection accuracy of the outline of the resist pattern based on the reflected light from the substrate.
- a resist pattern containing a photocoloring agent that reacts with light to develop color may be formed.
- a resist pattern containing a photocoloring agent that reacts with light to develop color is formed, and the resist pattern can be colored by exposing the resist pattern.
- a resist pattern having a thickness of 1 ⁇ m or more and 100 ⁇ m or less may be formed.
- this resist pattern inspection method by forming a resist pattern with a thickness of 1 ⁇ m or more and 100 ⁇ m or less, the resist pattern is prevented from becoming too thick, and light reflected from the resist pattern and areas other than the resist pattern are prevented. The contrast between reflected light can be increased. Therefore, it is possible to improve the detection accuracy of the outline of the resist pattern based on the reflected light from the substrate.
- a resist pattern manufacturing method includes a resist pattern forming step of forming a resist pattern on a substrate, and a coloring step of coloring the resist pattern after the resist pattern forming step.
- the resist pattern is formed on the substrate and then colored, thereby increasing the contrast between the reflected light from the resist pattern and the reflected light from areas other than the resist pattern. Therefore, for example, when detecting the contour of the resist pattern based on the reflected light from the substrate on which the resist pattern is formed, the detection accuracy can be improved. Also, when measuring the line width of the resist pattern, it becomes easier to focus on the surface of the resist pattern or the outline of the resist pattern.
- the resist pattern may be exposed to color in order to develop the color of the resist pattern.
- this resist pattern manufacturing method by exposing the resist pattern to color the resist pattern, for example, the accuracy of detection of the outline of the resist pattern based on the light reflected from the substrate can be improved.
- the resist pattern may be heated in order to develop the color of the resist pattern.
- the accuracy of detecting the outline of the resist pattern based on the reflected light from the substrate can be improved.
- the temperature of the resist pattern may be set to 35° C. or more and 150° C. or less in order to color the resist pattern.
- the temperature of the resist pattern is set to 35° C. or more and 150° C. or less to develop a color in the resist pattern, so that, for example, the accuracy of detection of the outline of the resist pattern based on the light reflected from the substrate can be improved. can.
- the resist pattern may be dyed in order to color the resist pattern.
- the resist pattern is dyed to develop a color, so that the accuracy of detection of the outline of the resist pattern based on the reflected light from the substrate can be improved.
- a resist pattern containing a photocoloring agent that reacts with light to develop color may be formed.
- the resist pattern by forming a resist pattern containing a photocoloring agent that develops color by reacting with light, the resist pattern can be colored by exposing the resist pattern.
- a resist pattern having a thickness of 1 ⁇ m or more and 100 ⁇ m or less may be formed.
- the resist pattern is prevented from becoming too thick, and light reflected from the resist pattern and areas other than the resist pattern are prevented.
- the contrast between reflected light can be increased. Therefore, for example, it is possible to improve the detection accuracy of the contour of the resist pattern based on the reflected light from the substrate.
- a substrate selection method includes a visual inspection process of visually inspecting a resist pattern based on reflected light from a substrate on which a resist pattern is formed, and an evaluation process of evaluating the resist pattern based on the visual inspection in the visual inspection process. And prepare.
- the resist pattern is evaluated by visual inspection of the resist pattern based on the light reflected from the board, so the board can be sorted with high precision in a short time compared to visual inspection using an SEM.
- the resist pattern may be evaluated based on the number or shape of defects in the resist pattern.
- the substrate can be properly evaluated by evaluating the resist pattern based on the number or shape of defects in the resist pattern.
- the printed wiring board manufacturing method includes a conductor pattern forming step of forming a conductor pattern by etching or plating a substrate whose resist pattern evaluation in the above-described substrate selection method satisfies the criteria.
- a resist pattern can be evaluated with high precision in a short time.
- FIG. 1(a) is a schematic perspective view for explaining a photosensitive layer forming step in the resist pattern forming step
- FIG. 1(b) is a schematic perspective view for explaining an exposure step in the resist pattern forming step
- FIG. 1(c) is a schematic perspective view for explaining the developing step in the resist pattern forming step
- 2(a), 2(b) and 2(c) are schematic perspective views for explaining formation of a conductor pattern based on a defective resist pattern.
- FIG. 3 is a schematic perspective view for explaining the appearance inspection process.
- FIG. 4 is a schematic diagram for explaining reflected light from the substrate.
- FIG. 5 is a schematic diagram for explaining pattern data.
- FIGS. 6A, 6B, and 6C are schematic perspective views for explaining the formation of conductor patterns.
- a or B may include either one of A and B, or may include both.
- a resist pattern inspection method includes a visual inspection step of visually inspecting a resist pattern based on reflected light from a substrate on which a resist pattern is formed.
- the resist pattern inspection method may include a resist pattern forming step of forming a resist pattern on the substrate before the appearance inspection step.
- the resist pattern inspection method may include other steps.
- the term "process” includes not only an independent process, but also when the intended action of the process is achieved even if it cannot be clearly distinguished from other processes. .
- a resist pattern can be said to be a pattern of a photocured product of a photosensitive resin composition, or a relief pattern.
- the resist pattern forming step includes a photosensitive layer forming step (see FIG. 1(a)) for laminating a photosensitive layer on a substrate, and a photocuring portion by irradiating a predetermined portion of the photosensitive layer with actinic rays. and a developing step (see FIG. 1C) for removing regions other than the predetermined portion of the photosensitive layer from the substrate.
- the resist pattern forming step may include other steps as required.
- a photosensitive layer 2 and a support 3 are formed on a substrate 1 .
- the substrate 1 includes, for example, an insulating layer 1a and a conductor layer 1b formed on the insulating layer 1a.
- the photosensitive layer 2 is formed on the conductor layer 1 b of the substrate 1 .
- the conductor layer 1b is, for example, electroless copper plating.
- the photosensitive layer 2 is a layer formed using a photosensitive resin composition whose properties change (for example, photo-curing) when exposed to light.
- the photosensitive resin composition forming the photosensitive layer 2 contains, for example, a binder polymer, a photopolymerizable compound, and a photopolymerization initiator.
- the photosensitive resin composition forming the photosensitive layer 2 may contain a photosensitizer, a polymerization inhibitor, or other components, if necessary.
- the photosensitive resin composition forming the photosensitive layer 2 includes, for example, dyes such as malachite green, victoria pure blue, brilliant green and methyl violet, tribromophenyl sulfone, leuco crystal violet, diphenylamine, benzylamine, triphenylamine, diethyl Photocoloring agents such as aniline and o-chloroaniline, thermal coloring inhibitors, plasticizers such as p-toluenesulfonamide, pigments, fillers, antifoaming agents, flame retardants, adhesion imparting agents, leveling agents, release accelerators , antioxidants, fragrances, imaging agents, and thermal cross-linking agents.
- dyes such as malachite green, victoria pure blue, brilliant green and methyl violet
- tribromophenyl sulfone leuco crystal violet
- diphenylamine benzylamine
- triphenylamine diethyl
- Photocoloring agents such as aniline and o
- a heat-resistant and solvent-resistant polymer film such as polyester such as polyethylene terephthalate (PET), polypropylene, or polyolefin such as polyethylene may be used.
- a photosensitive element comprises, for example, a support, a photosensitive layer, and a protective layer in this order. Then, after removing the protective layer, the photosensitive layer of the photosensitive element is pressed against the substrate 1 while being heated, whereby the photosensitive layer 2 and the support 3 are formed on the substrate 1 . As a result, a laminate 4 having the substrate 1, the photosensitive layer 2, the support 3, and the support film (not shown) in this order is obtained. An intermediate layer or the like may be arranged between the support 3 and the photosensitive layer 2 .
- the photosensitive layer 2 is exposed to actinic rays through the support 3 .
- the exposed portion irradiated with actinic rays is photocured to form a photocured portion 2a (latent image).
- a known exposure method can be applied, for example, a method of irradiating actinic rays imagewise through a photomask 5 called artwork (mask exposure method), an LDI (Laser Direct Imaging) exposure method, or , a method of irradiating imagewise through a lens using actinic rays on which an image of a photomask is projected (projection exposure method), and the like.
- the thickness of the resist pattern 6 formed on the substrate 1 may be, for example, 1 ⁇ m or more, 3 ⁇ m or more, or 5 ⁇ m or more. Also, the thickness of the resist pattern 6 formed on the substrate 1 may be, for example, 100 ⁇ m or less, 60 ⁇ m or less, or 40 ⁇ m or less. These minimum and maximum thicknesses of the resist pattern 6 can be combined as appropriate. For example, the thickness of the resist pattern 6 formed on the substrate 1 may be 1 ⁇ m or more and 100 ⁇ m or less, 3 ⁇ m or more and 60 ⁇ m or less, or 5 ⁇ m or more and 40 ⁇ m or less. The thickness of resist pattern 6 is the height with respect to substrate 1 in the direction perpendicular to the main surface of substrate 1 .
- ⁇ Appearance inspection process> In the visual inspection process, the resist pattern 6 is visually inspected based on reflected light from the substrate 1 on which the resist pattern 6 is formed.
- defects 8 may occur in the resist pattern 6.
- FIGS. 2(a), 2(b), and 2(c) in manufacturing a printed wiring board, a substrate 1 having a resist pattern 6 formed thereon is etched or plated. By doing so, the conductor pattern 9 is formed. Therefore, if there is a defect 8 in the resist pattern 6, defects such as disconnection or short circuit may occur in the conductor pattern 9 formed by etching or plating.
- the line width of the resist pattern 6 may become thicker or thinner depending on the exposure state of actinic rays.
- the resist pattern 6 is visually inspected in order to find defects before forming the conductor pattern.
- the contour of the resist pattern 6 is detected based on the reflected light from the substrate 1, and the resist pattern 6 is visually inspected based on the detected contour.
- the wavelength of the inspection light may be, for example, 380 nm or longer, 430 nm or longer, or 600 nm or longer. Also, the wavelength of the inspection light may be, for example, 830 nm or less, 780 nm or less, or 700 nm or less. These minimum and maximum wavelengths can be combined as appropriate. For example, the wavelength of the inspection light may be 380 nm or more and 830 nm or less, 430 nm or more and 780 nm or less, or 600 nm or more and 700 nm or less.
- White light using a laser excitation light source or the like may be used as the inspection light.
- the light receiving area of the substrate 1 that receives the reflected light in the visual inspection process may be, for example, 1 cm 2 or more and 2500 cm 2 or less, 5 cm 2 or more and 1200 cm 2 or less, or 25 cm 2 or more and 600 cm 2 or less.
- the irradiation method of the inspection light for example, either regular reflection light or diffuse reflection light may be used, or a combination of regular reflection light and diffuse reflection light may be used.
- the outline 10 of the resist pattern 6 is identified based on the contrast between the reflected light from the resist pattern 6 and the reflected light from the area other than the resist pattern 6. For example, in the received light image of the reflected light, a boundary where contrast such as brightness or chromaticity increases is detected. Then, this detected boundary is specified as the contour 10 of the resist pattern 6 .
- an automatic optical visual inspection device hereinafter also referred to as "AOI" such as AOI Ultra Fusion 600 (manufactured by Japan Orbotech Co., Ltd., trade name) ) is used.
- the appearance inspection of the resist pattern 6 includes, for example, an inspection to check whether there is a defect 8 in the resist pattern 6, an inspection to check the shape, position, size, etc. (hereinafter also referred to as "shape, etc.") of the defect 8 in the resist pattern 6, An inspection for checking the shape of the resist pattern 6 or an inspection for measuring the line width of the resist pattern 6 can be mentioned.
- the pattern data 11 for forming the pattern 6 are compared.
- the pattern data 11 for example, CAD data of the resist pattern 6 is used.
- a portion 10 a where the detected contour 10 differs from the pattern data 11 is detected as a defect 8 of the resist pattern 6 .
- the number of detected defects 8 is calculated.
- the line width of the resist pattern 6 is measured by measuring the interval between the contours 10 of the resist pattern 6 detected based on the reflected light from the substrate 1.
- the resist pattern inspection method may include a coloring step of coloring the resist pattern 6 formed on the substrate 1, if necessary.
- a coloring step of coloring the resist pattern 6 formed on the substrate 1, if necessary.
- to develop a color means not only the case where a color is developed from a colorless and transparent state, but also the case where a color that has already been developed becomes darker.
- a darker color means, for example, a lower light transmittance.
- the coloring process is performed, for example, after the resist pattern forming process and before the inspection process and the appearance inspection process.
- As the color development step for example, at least one of exposure treatment, heat treatment, exposure heat treatment, and dyeing treatment is performed.
- the resist pattern 6 is exposed in order to color the resist pattern 6 .
- a resist pattern 6 containing a photocoloring agent is formed.
- the photocolor former is a color former that develops color upon exposure (reacts with light to develop color).
- the photocolor former may be, for example, a color former that develops color upon exposure and temperature rise, or may be a color former whose color development is accelerated by temperature rise.
- the resist pattern 6 containing the photocoloring agent is formed, for example, by impregnating the photosensitive layer 2 with the photocoloring agent.
- photocoloring agents examples include tribromophenylsulfone, leuco crystal violet, diphenylamine, benzylamine, triphenylamine, diethylaniline and o-chloroaniline.
- the substrate 1 on which the resist pattern 6 is formed is exposed to actinic rays.
- the photocoloring agent contained in the resist pattern 6 develops color.
- the ratio of the transmittance of the resist pattern 6 after the exposure process to the transmittance of the resist pattern 6 before the exposure process of the inspection light emitted to the substrate 1 in the visual inspection process is 98% or less, 96%.
- the resist pattern 6 is exposed so as to be less than or less than 90%.
- the wavelength range of actinic rays is, for example, the wavelength range in which the photocoloring agent contained in the resist pattern 6 can develop colors by irradiation with actinic rays.
- the time of irradiation with actinic rays depends on the output of actinic rays and the type of photocoloring agent. It may be 0.5J or more, 1.0J or more, or 1.5J or more. Similarly, when the photochromic agent is leuco crystal violet, it may be 5.0 J or less, 3.0 J or less, or 2.5 J or less. These minimum and maximum energy amounts can be combined as appropriate. For example, the energy amount for irradiation with actinic rays may be 0.5 J or more and 5.0 J or less, 1.0 J or more and 3.0 J or less, or 1.5 J or more and 2.5 J or less.
- the resist pattern 6 is heated in order to color the resist pattern 6 .
- a resist pattern 6 containing a thermal coloring agent is formed.
- a thermal color former is a color former in which temperature elevation contributes to color development.
- the thermal color former may be, for example, a color former that develops color upon temperature elevation, or a color former that develops color upon exposure and accelerates color development upon temperature elevation.
- the resist pattern 6 containing the thermal coloring agent is formed, for example, by impregnating the photosensitive layer 2 with the coloring agent.
- a heat coloring agent for example, the same one as the photo coloring agent can be used.
- the substrate 1 on which the resist pattern 6 is formed is heated.
- the thermal coloring agent contained in the resist pattern 6 develops color.
- the ratio of the transmittance of the resist pattern 6 after the heat treatment to the transmittance of the resist pattern 6 before the heat treatment of the inspection light emitted to the substrate 1 in the visual inspection process is 98% or less, or 96%.
- the resist pattern 6 is heated so as to be less than or equal to 90% or less.
- the temperature of the resist pattern 6 may be set to 35°C or higher, 50°C or higher, or 60°C or higher. Similarly, the temperature of the resist pattern 6 may be 150° C. or lower, 120° C. or lower, or 100° C. or lower. These minimum and maximum temperatures can be combined as appropriate. For example, the temperature of the resist pattern 6 may be 35° C. or higher and 150° C. or lower, 50° C. or higher and 120° C. or lower, or 60° C. or higher and 100° C. or lower. If the ambient temperature around the substrate 1 falls within these temperature ranges, it is not necessary to prepare a separate heat source.
- the temperature of the resist pattern 6 may be the temperature of the resist pattern 6 itself, the temperature of the substrate 1 on which the resist pattern 6 is formed, or the temperature in the vicinity of the resist pattern 6 .
- the temperature near the resist pattern 6 is, for example, the temperature at a position within 50 cm, 30 cm, or 10 cm from the resist pattern 6 .
- a resist pattern 6 containing a photothermal coloring agent is formed.
- a photothermal color former is a color former in which exposure and temperature elevation contribute to color development.
- the photothermal coloring agent may be, for example, a coloring agent that develops color upon exposure and accelerates color development upon heating.
- the resist pattern 6 containing the photothermal coloring agent is formed, for example, by impregnating the photosensitive layer 2 with the photothermal coloring agent. As such a photothermal coloring agent, for example, the same photo coloring agent can be used.
- the substrate 1 on which the resist pattern 6 is formed is exposed to actinic rays and heated.
- the photothermal coloring agent contained in the resist pattern 6 develops color.
- the ratio of the transmittance of the resist pattern 6 after the exposure heat treatment to the transmittance of the resist pattern 6 before the exposure heat treatment of the inspection light emitted to the substrate 1 in the visual inspection process is 98% or less. , 96% or less, or 90% or less, the resist pattern 6 is exposed and heated.
- the wavelength range of the actinic ray is, for example, the wavelength range in which the photothermal coloring agent contained in the resist pattern 6 can develop color by irradiation with the actinic ray.
- the time for irradiating actinic rays depends on the output of actinic rays and the type of photothermal coloring agent. It may be 0.5J or more, 1.0J or more, or 1.5J or more. Similarly, when the photothermochromic agent is leuco crystal violet, it may be 5.0 J or less, 3.0 J or less, or 2.5 J or less. These minimum and maximum energy amounts can be combined as appropriate. For example, the energy amount for irradiation with actinic rays may be 0.5 J or more and 5.0 J or less, 1.0 J or more and 3.0 J or less, or 1.5 J or more and 2.5 J or less.
- the temperature of the resist pattern 6 may be set to 35° C. or higher, 50° C. or higher, or 60° C. or higher as heating for coloring the resist pattern 6 .
- the temperature of the resist pattern 6 may be 150° C. or lower, 120° C. or lower, or 100° C. or lower. These minimum and maximum temperatures can be combined as appropriate.
- the temperature of the resist pattern 6 may be 35° C. or higher and 150° C. or lower, or 50° C. or higher and 120° C. or lower, or 60° C. or higher and 100° C. or lower. If the ambient temperature around the substrate 1 falls within these temperature ranges, it is not necessary to prepare a separate heat source.
- the temperature of the resist pattern 6 may be the temperature of the resist pattern 6 itself, the temperature of the substrate 1 on which the resist pattern 6 is formed, or the temperature in the vicinity of the resist pattern 6 .
- the temperature near the resist pattern 6 is, for example, the temperature at a position within 50 cm, 30 cm, or 10 cm from the resist pattern 6 .
- the resist pattern 6 is dyed in order to color the resist pattern 6 .
- the substrate 1 with the resist pattern 6 formed thereon is immersed in a dyeing solution.
- the dyeing liquid for example, SDN black, a dye for resin (manufactured by Osaka Kasei Co., Ltd., trade name) is used.
- the entire substrate 1 may be immersed in the dyeing liquid, or a portion of the substrate 1 may be immersed in the dyeing liquid so that the entire resist pattern 6 is immersed in the dyeing liquid.
- the dyeing liquid may be dropped onto the substrate 1 on which the resist pattern 6 is formed.
- the staining liquid may be dropped on the entire substrate 1 or may be dropped on a part of the substrate 1 so that the staining liquid is dropped on the entire resist pattern 6 .
- the resist pattern manufacturing method includes a resist pattern forming step of forming a resist pattern 6 on a substrate 1 and a coloring step of coloring the resist pattern 6 after the resist pattern forming step.
- the resist pattern forming step of the resist pattern manufacturing method may be, for example, similar to the resist pattern forming step of the resist pattern inspection method described above.
- the coloring process of the resist pattern manufacturing method may be the same as the coloring process of the resist pattern inspection method described above, for example.
- the resist pattern manufacturing method may include other steps.
- the substrate sorting method includes a visual inspection step of visually inspecting the resist pattern 6 based on reflected light from the substrate 1 on which the resist pattern 6 is formed, and a resist pattern 6 based on the visual inspection in the visual inspection step. and an evaluation step of evaluating the
- the visual inspection process of the substrate sorting method may be the same as the visual inspection process of the resist pattern inspection method described above, for example.
- the substrate sorting method may include other steps.
- the resist pattern 6 is evaluated according to a predetermined standard.
- the resist pattern 6 is evaluated based on the number of defects 8 in the resist pattern 6 . For example, in the evaluation step, if the number of defects 8 in the resist pattern 6 is less than a predetermined reference number, it is evaluated as good, and if the number of defects 8 in the resist pattern 6 exceeds the predetermined reference number, it is evaluated as defective.
- the resist pattern 6 is evaluated based on the size of the defect 8 of the resist pattern 6 in the evaluation process. For example, if the shape of the defect 8 of the resist pattern 6 is within a predetermined allowable range, it is evaluated as good, and if the shape of the defect 8 of the resist pattern 6 is outside the predetermined allowable range, it is evaluated as defective.
- the resist pattern 6 is evaluated based on the shape of the resist pattern 6 in the evaluation process. For example, if the degree of difference in the shape of the resist pattern 6 with respect to the pattern data 11 is within a predetermined allowable range, it is determined to be good, and if the degree of difference in shape of the resist pattern 6 with respect to the pattern data 11 is outside the predetermined allowable range, it is determined to be defective. .
- the resist pattern 6 is evaluated based on the line width of the resist pattern 6 in the evaluation process. For example, in the evaluation process, if the line width of the resist pattern 6 is within a predetermined reference range, it is evaluated as good, and if the line width of the resist pattern 6 is outside the predetermined reference range, it is evaluated as defective.
- the method for manufacturing a printed wiring board according to the present embodiment includes a conductor pattern forming step of forming a conductor pattern by etching or plating a substrate whose resist pattern evaluation in the substrate selection method described above satisfies the criteria.
- the conductor pattern is not formed by etching or plating on a substrate whose resist pattern evaluation in the substrate selection method does not meet the criteria.
- the method for manufacturing a printed wiring board according to this embodiment may include other processes such as a resist pattern removing process, if necessary.
- a resist pattern formed on a substrate provided with a conductor layer is used as a mask to etch away the conductor layer of the substrate that is not covered with the resist.
- the resist is removed by removing the resist pattern 6 to form a conductor pattern.
- a resist pattern 6 formed on a substrate 1 having a conductor layer 1b is used as a mask to deposit copper or copper on the conductor layer 1b of the substrate 1 that is not covered with resist. Plating solder, etc.
- the resist is removed by removing the resist pattern 6, and as shown in FIG. 6C, the conductor layer 1b covered with the resist is etched. , forming the conductor pattern 9 .
- the method of plating treatment may be electrolytic plating treatment or electroless plating treatment, and among them, electrolytic plating treatment may be used.
- the resist pattern 6 is visually inspected based on the reflected light from the substrate 1 on which the resist pattern 6 is formed.
- the defect 8 of the resist pattern 6 can be detected in a short time with high accuracy.
- the resist pattern 6 is properly inspected by utilizing the outline 10 of the resist pattern 6 detected based on the reflected light from the substrate 1 as the appearance inspection of the resist pattern 6. can do.
- a defect 8 of the resist pattern 6 is detected with high precision by comparing the detected contour 10 with the pattern data 11 for forming the resist pattern 6. can be detected.
- the formation state of the resist pattern 6 can be evaluated by measuring the line width of the resist pattern 6 based on the detected contour 10 as a visual inspection of the resist pattern 6.
- the transmittance is lowered.
- the contrast between the light reflected from the area is increased. Therefore, the detection accuracy of the outline 10 of the resist pattern 6 based on the reflected light from the substrate 1 can be improved.
- this resist pattern inspection method by exposing the resist pattern 6 to color the resist pattern 6, the detection accuracy of the outline 10 of the resist pattern 6 based on the reflected light from the substrate 1 can be improved.
- the detection accuracy of the outline 10 of the resist pattern 6 based on the reflected light from the substrate 1 can be improved.
- the temperature of the resist pattern 6 is set to 35° C. to 150° C., 50° C. to 120° C., or 60° C. to 100° C. to cause the resist pattern 6 to develop a color.
- the detection accuracy of the contour 10 of the resist pattern 6 based on the reflected light from the reflective light can be improved.
- this resist pattern inspection method by dyeing the resist pattern 6 to develop a color, the detection accuracy of the outline 10 of the resist pattern 6 based on the reflected light from the substrate 1 can be improved.
- the resist pattern 6 by forming the resist pattern 6 containing a photocoloring agent that reacts with light to develop color, the resist pattern 6 can be colored by exposing the resist pattern 6 to light. .
- the thickness of the resist pattern 6 formed on the substrate 1 is, for example, 1 ⁇ m or more. , 3 ⁇ m or more, or 5 ⁇ m or more. Also, the thickness of the resist pattern 6 formed on the substrate 1 may be, for example, 100 ⁇ m or less, 60 ⁇ m or less, or 40 ⁇ m or less.
- the thickness of the resist pattern 6 formed on the substrate 1 may be 1 ⁇ m or more and 100 ⁇ m or less, 3 ⁇ m or more and 60 ⁇ m or less, or 5 ⁇ m or more and 40 ⁇ m or less.
- the resist pattern 6 is prevented from becoming too thick.
- the contrast between the reflected light from the pattern 6 and the reflected light from the area other than the resist pattern 6 can be increased. Therefore, the detection accuracy of the outline 10 of the resist pattern 6 based on the reflected light from the substrate 1 can be improved.
- the resist pattern 6 is formed on the substrate 1 and then the resist pattern 6 is colored so that the reflected light from the resist pattern 6 and the reflected light from the area other than the resist pattern 6 are increases the contrast between Therefore, for example, when the contour 10 of the resist pattern 6 is detected based on the reflected light from the substrate 1 on which the resist pattern 6 is formed, detection accuracy can be improved. Further, when measuring the line width of the resist pattern 6, it becomes easier to focus on the surface of the resist pattern 6 or the outline of the resist pattern 6. FIG.
- this resist pattern manufacturing method by exposing the resist pattern 6 to color the resist pattern 6, for example, the detection accuracy of the outline 10 of the resist pattern 6 based on the reflected light from the substrate 1 can be improved. can.
- this resist pattern manufacturing method by heating the resist pattern 6 to develop a color, for example, the detection accuracy of the outline 10 of the resist pattern 6 based on the reflected light from the substrate 1 can be improved. can.
- the temperature of the resist pattern 6 is set to 35° C. to 150° C., 50° C. to 120° C., or 60° C. to 100° C. to color the resist pattern 6, for example.
- the detection accuracy of the outline 10 of the resist pattern 6 based on the reflected light from the substrate 1 can be improved.
- the resist pattern 6 is dyed to develop a color, so that the detection accuracy of the outline 10 of the resist pattern 6 based on the reflected light from the substrate 1 can be improved. can.
- the resist pattern 6 by forming the resist pattern 6 containing a photocoloring agent that develops color by reacting with light, the resist pattern 6 can be colored by exposing the resist pattern 6 to light. .
- the resist pattern 6 is formed with a thickness of 1 ⁇ m to 100 ⁇ m, 3 ⁇ m to 60 ⁇ m, or 5 ⁇ m to 40 ⁇ m, thereby preventing the resist pattern 6 from becoming too thick. , the contrast between the reflected light from the resist pattern 6 and the reflected light from the area other than the resist pattern 6 can be increased. Therefore, for example, the detection accuracy of the contour 10 of the resist pattern 6 based on the reflected light from the substrate 1 can be improved.
- the substrate sorting method since the resist pattern 6 is evaluated by the appearance inspection of the resist pattern 6 based on the light reflected from the substrate 1, the substrate can be inspected in a short time and with high accuracy compared to the appearance inspection using the SEM. 1 can be selected.
- the substrate 1 can be evaluated appropriately by evaluating the substrate 1 based on the number or shape of defects in the resist pattern 6 .
- the substrate 1 that satisfies the evaluation criteria for the resist pattern 6 in the substrate selection method described above is etched or plated to form the conductor pattern 9. It is possible to suppress the occurrence of defects such as disconnection or short circuit.
- Photosensitive Element and Substrate In Examples 1 to 12 and Comparative Example 1, the photosensitive element and substrate shown in Table 1 and below were used. The last two digits of the product name of the photosensitive element indicate the film thickness (unit: ⁇ m) of the photosensitive layer.
- F-1 RY-5115 (manufactured by Showa Denko Materials Co., Ltd., trade name)
- F-2 RY-5125 (manufactured by Showa Denko Materials Co., Ltd., trade name, photosensitive layer composition is the same as (F-1))
- F-3 FL-7225 (manufactured by Showa Denko Materials Co., Ltd., trade name)
- F-4 ME-3606SG (manufactured by Showa Denko Materials Co., Ltd., trade name)
- F-5 A photosensitive element (base material) produced by increasing the amount of MKG (malachite green) of RY-5115 (manufactured by Showa Denko Materials Co., Ltd., trade name) to 10 times.
- S-1 Cu sputtered PET film (manufactured by Geomatec, plate thickness: 125 ⁇ m, Ra ⁇ 50 nm)
- S-2 GL-102 (manufactured by Ajinomoto Fine-Techno Co., Inc., trade name, Ra: about 100 nm)
- S-3 MCL-E67 (manufactured by Showa Denko Materials Co., Ltd., trade name, Ra: about 300 nm)
- Examples 1 to 5, 7 and 8 to 11 S-1, which had been stored under moisture-proof conditions, was used as a substrate having a copper layer as a conductive layer.
- a substrate having a copper layer as a conductive layer was pickled and washed with water, dried with an air stream, and then heated to 80°C.
- the photosensitive element was laminated on the surface of the copper layer of the substrate. While peeling off the protective layer of the photosensitive element, lamination is carried out using a heat roll at 110° C. with a pressure of 0.4 MPa and 1 A roll speed of .0 m/min was used. In this way, laminates of Examples 1 to 12 and Comparative Example 1 were obtained in which the substrate, the photosensitive layer and the support were laminated in this order. The obtained laminate was used as a test piece for the tests described below.
- a substrate after development processing exposed using a photomask for resolution evaluation is referred to as a patterned substrate for resolution evaluation, and a substrate after development processing exposed using a photomask for pattern inspection is referred to as a patterned inspection substrate.
- Example 8 A direct exposure device (manufactured by Nippon Orbotech Co., Ltd., trade name “Nuvogo Fine 8”) was used to expose the photosensitive layer with a predetermined amount of energy. After the exposure, development processing was performed in the same procedure as in Examples 1 to 7, 9 to 10 and Comparative Example 1 to prepare a patterned substrate for evaluation of resolution and a patterned substrate for inspection.
- Example 1 Using a resin dye SDN black (manufactured by Osaka Kasei Co., Ltd., trade name), 300 ml of a solution diluted 20 times with water was prepared (liquid temperature: 25 ° C.), and placed in a stainless steel vat with an outer diameter of 20 ⁇ 25 ⁇ 5 cm. fulfilled. The substrate after development was immersed in the solution and dyed for 3 hours while moving the substrate lightly. After a predetermined time, it was taken out, washed with water, and air-blown dried.
- SDN black manufactured by Osaka Kasei Co., Ltd., trade name
- Example 2 Using a parallel exposure machine (manufactured by Oak Manufacturing Co., Ltd., trade name "EXM-1201", mixed rays of 365 nm and 405 nm), the entire substrate after development was exposed for about 2.0 J. The temperature in the vicinity of the substrate surface during exposure was 31°C.
- Example 3 Using a large UV irradiation device (manufactured by Oak Manufacturing Co., Ltd., trade name "QRM-2317-F-00"), the substrate after development is flowed on the conveyor at a conveyor speed where the exposure amount per time is about 0.5 J. was exposed to light.
- the exposure process was performed once and the exposure amount was set to 0.5J.
- the temperature in the vicinity of the substrate surface during exposure in Example 3 was 35°C.
- Examples 4 and 6-8 the exposure process was performed twice, and the total exposure amount was 1J.
- the temperature in the vicinity of the substrate surface during exposure in Examples 4 and 6-8 was 50.degree.
- Examples 5 and 9 the exposure process was performed three times, and the total exposure amount was 1.5J.
- the temperature in the vicinity of the substrate surface during exposure in Example 5 was 35°C.
- the temperature near the substrate surface during exposure in Examples 5 and 9 was 62°C.
- a photosensitive element F-1 was laminated (stacked) on the surface of a slide glass (manufactured by Matsunami Glass Industry Co., Ltd., product name: "White slide glass cut-off No. 1 S1126"). While peeling the protective layer, the photosensitive layer of the photosensitive element is in contact with the surface of the slide glass, and the lamination is carried out using heat rolls at 110°C at a pressure of 0.2 MPa and a roll speed of 1.0 m/min. I went with After laminating the photosensitive layer on the slide glass, exposure processing and coloring processing were carried out under the same conditions as in the pattern substrate production, and the support was peeled off to produce a sample for transmittance measurement.
- the absorbance of the photosensitive layer was measured using a U-3310 spectrophotometer (manufactured by Hitachi High-Tech Science Co., Ltd., measurement conditions: wavelength range: 330 to 700 nm, scan speed: 300 nm/min, scan interval: 0.50 nm). Baseline measurements were made using untreated glass slides for reference and sample. From the obtained measurement spectrum, the absorbance at the wavelength (635 nm) of the inspection light was recorded, and the transmittance of the inspection light was calculated.
- the pattern detection rate is the probability that the inspection apparatus can identify the outline of the resist pattern and recognize the pattern when the appearance inspection is performed.
- the inspection apparatus sets an appropriate gray level (threshold value for brightness/darkness binarization) according to each of Examples 1 to 12, and when this setting is completed, it is OK. If an error occurred without completion, it was judged as NG.
- A is given when the result is OK every time
- B is given when the probability of being NG is low even though the result is not OK every time, and the probability of NG is high.
- C is the case.
- A is less than 10 minutes/cm 2
- B is 10 minutes/cm 2 or more and less than 5000 minutes/100 cm 2
- C is 5000 minutes/100 cm 2 or more.
- the pattern detection rate was higher than in Examples 11-12. From this result, in the appearance inspection of the resist pattern performed based on the reflected light from the substrate on which the resist pattern is formed, by coloring the resist pattern, the outline of the resist pattern can be easily detected, and the inspection accuracy can be improved. was confirmed.
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Abstract
Description
実施形態に係るレジストパターンの検査方法は、レジストパターンが形成された基板からの反射光に基づいてレジストパターンを外観検査する外観検査工程を備える。レジストパターンの検査方法は、外観検査工程の前に、基板上にレジストパターンを形成するレジストパターン形成工程を含んでもよい。また、レジストパターンの検査方法は、他の工程を含んでもよい。本明細書において「工程」との語は、独立した工程だけではなく、他の工程と明確に区別できない場合であってもその工程の所期の作用が達成されれば、本用語に含まれる。レジストパターンとは、感光性樹脂組成物の光硬化物パターンともいえ、レリーフパターンともいえる。
図1に示すように、レジストパターン形成工程は、感光層を基板上に積層する感光層形成工程(図1(a)参照)と、感光層の所定部分に活性光線を照射して光硬化部を形成する露光工程(図1(b)参照)と、感光層の所定部分以外の領域を基板上から除去する現像工程(図1(c)参照)と、を有する。レジストパターン形成工程は、必要に応じて、他の工程を含んでもよい。
図1(a)に示すように、感光層形成工程では、基板1上に感光層2及び支持体3を形成する。基板1は、例えば、絶縁層1aと、絶縁層1a上に形成された導体層1bと、を備えている。感光層2は、基板1の導体層1b上に形成される。導体層1bは、例えば、無電解銅めっきである。
図1(b)に示すように、露光工程では、支持体3を介して感光層2を活性光線によって露光する。これにより、活性光線が照射された露光部が光硬化して、光硬化部2a(潜像)が形成される。露光方法としては、公知の露光方式を適用でき、例えば、アートワークと呼ばれるフォトマスク5を介して活性光線を画像状に照射する方法(マスク露光方式)、LDI(Laser Direct Imaging)露光方式、又は、フォトマスクの像を投影させた活性光線を用いレンズを介して画像状に照射する方法(投影露光方式)等が挙げられる。
図1(c)に示すように、現像工程では、感光層2の未硬化部2bを基板1上から除去する。現像工程により、感光層2が光硬化した光硬化部2aからなるレジストパターン6が基板1上に形成される。
外観検査工程では、レジストパターン6が形成された基板1からの反射光に基づいてレジストパターン6を外観検査する。
実施形態に係るレジストパターンの検査方法は、必要に応じて、基板1上に形成されたレジストパターン6を発色させる発色工程を備えてもよい。ここで、発色するとは、無色透明の状態から色が発現する場合だけではなく、既に色が発現された状態から色が濃くなる場合も意味する。色が濃くなるとは、例えば、光の透過度が低くなることをいう。発色工程は、例えば、レジストパターン形成工程の後、かつ、検査工程及び外観検査工程の前に行う。発色工程としては、例えば、露光処理、加熱処理、露光加熱処理、及び染色処理の少なくとも一つの処理を行う。
露光処理では、レジストパターン6を発色させるためにレジストパターン6を露光する。例えば、レジストパターン形成工程において、光発色剤が含まれたレジストパターン6を形成しておく。光発色剤は、露光することで発色する(光と反応して発色する)発色剤である。光発色剤は、例えば、露光及び昇温により発色する発色剤であってもよく、昇温により発色が促進される発色剤であってもよい。光発色剤が含まれたレジストパターン6は、例えば、感光層2に光発色剤を含ませておくことにより形成される。このような光発色剤としては、例えば、トリブロモフェニルスルホン、ロイコクリスタルバイオレット、ジフェニルアミン、ベンジルアミン、トリフェニルアミン、ジエチルアニリン及びo-クロロアニリン等が用いられる。そして、露光処理において、レジストパターン6が形成された基板1を活性光線によって露光する。これにより、レジストパターン6に含まれている光発色剤が発色する。露光処理では、例えば、外観検査工程で基板1に出射する検査光の、露光処理前のレジストパターン6の透過率に対する露光処理後のレジストパターン6の透過率の割合が、98%以下、96%以下、又は90%以下となるように、レジストパターン6を露光する。
加熱処理では、レジストパターン6を発色させるためにレジストパターン6を加熱する。例えば、レジストパターン形成工程において、熱発色剤が含まれたレジストパターン6を形成する。熱発色剤は、昇温が発色に寄与する発色剤である。熱発色剤は、例えば、昇温により発色される発色剤であってもよく、露光により発色して昇温により発色が促進される発色剤であってもよい。熱発色剤が含まれたレジストパターン6は、例えば、感光層2に発色剤を含ませておくことにより形成される。このような熱発色剤としては、例えば、光発色剤と同様のもの用いることができる。そして、加熱処理において、レジストパターン6が形成された基板1を加熱する。これにより、レジストパターン6に含まれている熱発色剤が発色する。加熱処理では、例えば、外観検査工程で基板1に出射する検査光の、加熱処理前のレジストパターン6の透過率に対する加熱処理後のレジストパターン6の透過率の割合が、98%以下、96%以下、又は90%以下となるように、レジストパターン6を加熱する。
露光加熱処理では、レジストパターン6を発色させるためにレジストパターン6を露光及び加熱する。例えば、レジストパターン形成工程において、光熱発色剤が含まれたレジストパターン6を形成しておく。光熱発色剤は、露光及び昇温が発色に寄与する発色剤である。光熱発色剤は、例えば、露光により発色して昇温により発色が促進される発色剤であってもよい。光熱発色剤が含まれたレジストパターン6は、例えば、感光層2に光熱発色剤を含ませておくことにより形成される。このような光熱発色剤としては、例えば、光発色剤と同様のものを用いることができる。そして、露光加熱処理において、レジストパターン6が形成された基板1を活性光線によって露光するとともに加熱する。これにより、レジストパターン6に含まれている光熱発色剤が発色する。露光加熱処理では、例えば、外観検査工程で基板1に出射する検査光の、露光加熱処理前のレジストパターン6の透過率に対する露光加熱処理後のレジストパターン6の透過率の割合が、98%以下、96%以下、又は90%以下となるように、レジストパターン6を露光及び加熱する。
染色処理では、レジストパターン6を発色させるためにレジストパターン6を染色する。例えば、レジストパターン6が形成された基板1を染色液に浸す。染色液としては、例えば、樹脂用染料SDN黒(大阪化成株式会社製、商品名)が用いられる。この場合、基板1全体を染色液に浸してもよく、レジストパターン6全体が染色液に浸されるように基板1の一部を染色液に浸してもよい。また、例えば、レジストパターン6が形成された基板1に染色液を滴下してもよい。この場合、基板1全体に染色液を滴下してもよく、レジストパターン6全体に染色液が滴下されるように基板1の一部に染色液を滴下してもよい。
実施形態に係るレジストパターンの製造方法は、基板1上にレジストパターン6を形成するレジストパターン形成工程と、レジストパターン形成工程の後に、レジストパターン6を発色させる発色工程と、を備える。レジストパターンの製造方法のレジストパターン形成工程は、例えば、上述したレジストパターンの検査方法のレジストパターン形成工程と同様としてもよい。また、レジストパターンの製造方法の発色工程は、例えば、上述したレジストパターンの検査方法の発色工程と同様としてもよい。レジストパターンの製造方法は、他の工程を含んでもよい。
本実施形態に係る基板選別方法は、レジストパターン6が形成された基板1からの反射光に基づいてレジストパターン6を外観検査する外観検査工程と、外観検査工程における外観検査に基づいてレジストパターン6を評価する評価工程と、を備える。基板選別方法の外観検査工程は、例えば、上述したレジストパターンの検査方法の外観検査工程と同様としてもよい。基板選別方法は、他の工程を含んでもよい。
評価工程では、レジストパターン6を所定の基準で評価する。
本実施形態に係るプリント配線板の製造方法は、上述した基板選別方法におけるレジストパターンの評価が基準を満たす基板をエッチング処理又はめっき処理して導体パターンを形成する導体パターン形成工程を備える。つまり、導体パターン形成工程では、基板選別方法におけるレジストパターンの評価が基準を満たさない基板に対しては、エッチング処理又はめっき処理して導体パターンを形成しない。本実施形態に係るプリント配線板の製造方法は、必要に応じてレジストパターン除去工程等のその他の工程を含んでもよい。
実施例1~12及び比較例1では、表1及び以下に示す感光性エレメント及び基材を用いた。なお、感光性エレメントの商品名の下二桁は感光層の膜厚(単位:μm)を示す。
(感光性エレメント)
F-1:RY-5115(昭和電工マテリアルズ株式会社製、商品名)
F-2:RY-5125(昭和電工マテリアルズ株式会社製、商品名、感光層組成は(F-1)と同一)
F-3:FL-7225(昭和電工マテリアルズ株式会社製、商品名)
F-4:ME-3606SG(昭和電工マテリアルズ株式会社製、商品名)
F-5:RY-5115(昭和電工マテリアルズ株式会社製、商品名)のMKG(マラカイトグリーン)を10倍量にして製造した感光性エレメント
(基材)
S-1:CuスパッタPETフィルム(ジオマテック株式会社製、板厚:125μm、Ra<50nm)
S-2:GL-102(味の素ファインテクノ株式会社製、商品名、Ra:約100nm)
S-3:MCL-E67(昭和電工マテリアルズ株式会社製、商品名、Ra:約300nm)
実施例1~5、7及び8~11では、防湿条件下で保管していたS-1を、導電層としての銅層を有する基板として用いた。実施例6、8及び比較例1では、導電層としての銅層を有する基板を酸洗及び水洗して空気流で乾燥した後、基板を80℃に加温した。その後、実施例1~12及び比較例1では、感光性エレメントを基板の銅層の表面にラミネート(積層)した。ラミネートは、感光性エレメントの保護層を剥離しながら、感光性エレメントの感光層が基板の銅層の表面に接するようにして、110℃のヒートロールを用いて、0.4MPaの圧着圧力、1.0m/分のロール速度で行った。こうして、基板と感光層と支持体とがこの順で積層された、実施例1~12及び比較例1の積層体を得た。得られた積層体は以下に示す試験の試験片として用いた。
[実施例1~7、9~12及び比較例1]
ガラスクロムタイプのフォトマスク(解像性評価用またはパターン検査用)を用いて、超高圧水銀ランプ(365nm)を光源とする投影露光装置(ウシオ電機株式会社製、商品名「UX-2240SM」)を用いて、所定のエネルギー量で感光層を露光した(露光処理)。なお、解像性評価用フォトマスクには、ライン幅/スペース幅がx/x(x:1~30、単位:μm)の配線パターンを有するものを用い、パターン検査用フォトマスクには、ライン幅/スペース幅がx/x(x:10,15,20、単位:μm)の配線パターンを有するもの(パターンエリア:90mm×90mm)を用いた。
半導体レーザー(375nm及び405nm混線、波長の比率は任意で変更可能(375nm:405nm=0:100~100:0))を光源とする直描露光装置(日本オルボテック株式会社製、商品名「Nuvogo Fine 8」)を用いて、所定のエネルギー量で感光層を露光した。露光後、実施例1~7、9~10及び比較例1と同じ手順で現像処理を行って、解像性評価用パターン基板及び検査用パターン基板を作製した。
検査用パターン基板を用いて、以下の処理を行った。
樹脂用染料SDN黒(大阪化成株式会社製、商品名)を用いて、水で20倍に薄めた溶液を300ml作製し(液温:25℃)、外径20×25×5cmのステンレスバットに満たした。溶液中に現像後の基板を浸漬し、適宜軽く基板を動かしながら3時間染色した。所定時間後、引き上げて水洗し、エアブロー乾燥した。
平行露光機(オーク製作所製、商品名「EXM-1201」、365nm及び405nm混線)を用いて、現像後の基板全体に約2.0J露光した。露光時の基板表面近傍の温度は、31℃であった。
大型UV照射装置(オーク製作所社製、商品名「QRM-2317-F-00」)を用いて、1回当たりの露光量が約0.5Jとなるコンベア速度で、現像後基板をコンベアに流して露光処理した。実施例3では、露光処理を1回行い、露光量を0.5Jとした。実施例3の露光時の基板表面近傍の温度は、35℃であった。実施例4、6-8では、露光処理を2回行い、合計の露光量を1Jとした。実施例4、6-8の露光時の基板表面近傍の温度は、50℃であった。実施例5、9では、露光処理を3回行い、合計の露光量を1.5Jとした。実施例5の露光時の基板表面近傍の温度は、35℃であった。実施例5、9の露光時の基板表面近傍の温度は、62℃であった。
スライドガラス(松浪硝子工業株式会社製、商品名「白スライドグラス 切放No.1 S1126」)表面に、F-1の感光性エレメントをラミネート(積層)した。ラミネートは、保護層を剥離しながら、感光性エレメントの感光層がスライドガラス表面に接するようにして、110℃のヒートロールを用いて、0.2MPaの圧着圧力、1.0m/分のロール速度で行った。スライドガラス上に感光層を積層した後、パターン基板作製時と同等の条件で露光処理及び着色処理を行い、支持体を剥離し、透過率測定用のサンプルを作製した。感光層の吸光度は、U-3310形分光光度計(株式会社日立ハイテクサイエンス製、測定条件 波長範囲:330~700nm、スキャンスピード:300nm/分、スキャン間隔:0.50nm)を用いて測定した。ベースライン測定は、リファレンス及びサンプルに未処理のスライドガラスを用いて行った。得られた測定スペクトルから、検査光の波長(635nm)における吸光度を記録し、検査光の透過率を算出した。
実施例1~12では、レジストパターンの外観検査として、AOI Ultra Fusion 600(日本オルボテック株式会社製、商品名)を用いて、レジストパターンの欠陥を検出した。パネル極性はNegativeに設定し、ライト強度は正反射光:120、拡散反射光:60、使用ライトは赤色のみとした。比較例1では、レジストパターンの外観検査として、SU-1500(株式会社日立ハイテクノロジーズ製、商品名)のSEMを用いて、レジストパターンの欠陥を観察した。このとき、加速電圧は15kV、電流値は10μAとした。そして、実施例1~12及び比較例1について、外観検査の時間を評価し、実施例1~12については、レジストパターンの欠陥のパターン検出率についても評価した。パターン検出率とは、外観検査を行う際に、検査装置がレジストパターンの輪郭を識別してパターンを認識できた確率をいう。つまり、外観検査を行う前に、検査装置により、実施例1~12のそれぞれに応じた適正なグレイレベル(明暗二値化の閾値)設定を行い、この設定が完了すればOK、この設定が完了せずにエラーが発生すればNGとした。そして、レジストパターンの欠陥のパターン検出率の評価では、毎回OKとなった場合をA、毎回OKとならなかったがNGとなった確率が低かった場合をBとし、NGとなった確率が高かった場合をCとした。外観検査の時間の評価では、10分/cm2未満をA、10分/cm2以上5000分/100cm2未満をB、5000分/100cm2以上をCとした。
表1に示すように、実施例1~12では、比較例1に比べて、検査時間が顕著に短縮された。この結果から、レジストパターンが形成された基板からの反射光に基づいてレジストパターンを外観検査することで、SEMを用いた外観検査に比べて、短時間でレジストパターンの欠陥を検出することができることが確認された。
Claims (21)
- レジストパターンが形成された基板からの反射光に基づいて前記レジストパターンを外観検査する外観検査工程を備える、
レジストパターンの検査方法。 - 前記外観検査工程では、基板からの反射光に基づいて前記レジストパターンの輪郭を検出し、検出した前記輪郭に基づいて前記レジストパターンを外観検査する、
請求項1に記載のレジストパターンの検査方法。 - 前記外観検査工程では、検出した前記輪郭と前記レジストパターンを形成するためのパターンデータとを対比する、
請求項2に記載のレジストパターンの検査方法。 - 前記外観検査工程では、検出した前記輪郭に基づいて前記レジストパターンの線幅を計測する、
請求項2に記載のレジストパターンの検査方法。 - 前記基板上に前記レジストパターンを形成するレジストパターン形成工程と、
前記レジストパターン形成工程の後に、前記レジストパターンを発色させる発色工程と、を更に備える、
請求項1~4の何れか一項に記載のレジストパターンの検査方法。 - 前記発色工程では、前記レジストパターンを発色させるために前記レジストパターンを露光する、
請求項5に記載のレジストパターンの検査方法。 - 前記発色工程では、前記レジストパターンを発色させるために前記レジストパターンを加熱する、
請求項5又は6に記載のレジストパターンの検査方法。 - 前記発色工程では、前記レジストパターンを発色させるために前記レジストパターンの温度を35℃以上150℃以下にする、
請求項5~7の何れか一項に記載のレジストパターンの検査方法。 - 前記発色工程では、前記レジストパターンを発色させるために前記レジストパターンを染色する、
請求項5~8の何れか一項に記載のレジストパターンの検査方法。 - 前記レジストパターン形成工程では、光と反応して発色する光発色剤が含まれた前記レジストパターンを形成する、
請求項5~9の何れか一項に記載のレジストパターンの検査方法。 - 前記レジストパターン形成工程では、1μm以上100μm以下の厚さの前記レジストパターンを形成する、
請求項5~10の何れか一項に記載のレジストパターンの検査方法。 - 基板上にレジストパターンを形成するレジストパターン形成工程と、
前記レジストパターン形成工程の後に、前記レジストパターンを発色させる発色工程と、を備える、
レジストパターンの製造方法。 - 前記発色工程では、前記レジストパターンを発色させるために前記レジストパターンを露光する、
請求項12に記載のレジストパターンの製造方法。 - 前記発色工程では、前記レジストパターンを発色させるために前記レジストパターンを加熱する、
請求項12又は13に記載のレジストパターンの製造方法。 - 前記発色工程では、前記レジストパターンを発色させるために前記レジストパターンの温度を35℃以上150℃以下にする、
請求項12~14の何れか一項に記載のレジストパターンの製造方法。 - 前記発色工程では、前記レジストパターンを発色させるために前記レジストパターンを染色する、
請求項12~15の何れか一項に記載のレジストパターンの製造方法。 - 前記レジストパターン形成工程では、光と反応して発色する光発色剤が含まれた前記レジストパターンを形成する、
請求項12~16の何れか一項に記載のレジストパターンの製造方法。 - 前記レジストパターン形成工程では、1μm以上100μm以下の厚さの前記レジストパターンを形成する、
請求項12~17の何れか一項に記載のレジストパターンの製造方法。 - レジストパターンが形成された基板からの反射光に基づいて前記レジストパターンを外観検査する外観検査工程と、
前記外観検査工程における前記外観検査に基づいて前記レジストパターンを評価する評価工程と、を備える、
基板選別方法。 - 前記評価工程では、前記レジストパターンの欠陥の数又は形状により前記レジストパターンを評価する、
請求項19に記載の基板選別方法。 - 請求項19又は20に記載の基板選別方法における前記レジストパターンの前記評価が基準を満たす前記基板をエッチング処理又はめっき処理して導体パターンを形成する導体パターン形成工程を備える、
プリント配線板の製造方法。
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PCT/JP2021/002093 WO2022157895A1 (ja) | 2021-01-21 | 2021-01-21 | レジストパターンの検査方法、レジストパターンの製造方法、基板選別方法、及びプリント配線板の製造方法 |
CN202180090280.8A CN116745604A (zh) | 2021-01-21 | 2021-01-21 | 抗蚀图案的检查方法、抗蚀图案的制造方法、基板筛选方法及印刷线路板的制造方法 |
JP2022576304A JPWO2022157895A1 (ja) | 2021-01-21 | 2021-01-21 | |
TW110144542A TW202231152A (zh) | 2021-01-21 | 2021-11-30 | 抗蝕圖案之檢查方法、抗蝕圖案之製造方法、基板篩選方法及印刷配線板之製造方法 |
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Citations (6)
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JPH04152343A (ja) * | 1990-10-17 | 1992-05-26 | Hitachi Chem Co Ltd | プリント配線板の製造方法 |
JPH07336024A (ja) * | 1994-06-07 | 1995-12-22 | Hitachi Ltd | 薄膜配線の形成方法 |
JPH09257640A (ja) * | 1996-03-22 | 1997-10-03 | Toppan Printing Co Ltd | パターン欠陥検査方法及びそれを用いた金属薄板パターンエッチング製品の製造方法 |
JPH10170715A (ja) * | 1996-12-12 | 1998-06-26 | Canon Inc | 樹脂ブラックマトリクスの製造方法、該方法によって製造された樹脂ブラックマトリクス、該ブラックマトリクスを有する液晶用カラーフィルター及び該カラーフィルターを用いた液晶パネル |
JP2006086154A (ja) * | 2004-09-14 | 2006-03-30 | Matsushita Electric Ind Co Ltd | マクロ検査方法 |
US20200183283A1 (en) * | 2018-12-10 | 2020-06-11 | Kla Corporation | Inspection sensitivity improvements for optical and electron beam inspection |
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JP2005207802A (ja) | 2004-01-21 | 2005-08-04 | Toshiba Corp | レジストパターン検査方法及びその検査装置 |
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- 2021-01-21 KR KR1020237026365A patent/KR20230132495A/ko active Search and Examination
- 2021-01-21 WO PCT/JP2021/002093 patent/WO2022157895A1/ja active Application Filing
- 2021-01-21 CN CN202180090280.8A patent/CN116745604A/zh active Pending
- 2021-11-30 TW TW110144542A patent/TW202231152A/zh unknown
Patent Citations (6)
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JPH04152343A (ja) * | 1990-10-17 | 1992-05-26 | Hitachi Chem Co Ltd | プリント配線板の製造方法 |
JPH07336024A (ja) * | 1994-06-07 | 1995-12-22 | Hitachi Ltd | 薄膜配線の形成方法 |
JPH09257640A (ja) * | 1996-03-22 | 1997-10-03 | Toppan Printing Co Ltd | パターン欠陥検査方法及びそれを用いた金属薄板パターンエッチング製品の製造方法 |
JPH10170715A (ja) * | 1996-12-12 | 1998-06-26 | Canon Inc | 樹脂ブラックマトリクスの製造方法、該方法によって製造された樹脂ブラックマトリクス、該ブラックマトリクスを有する液晶用カラーフィルター及び該カラーフィルターを用いた液晶パネル |
JP2006086154A (ja) * | 2004-09-14 | 2006-03-30 | Matsushita Electric Ind Co Ltd | マクロ検査方法 |
US20200183283A1 (en) * | 2018-12-10 | 2020-06-11 | Kla Corporation | Inspection sensitivity improvements for optical and electron beam inspection |
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TW202231152A (zh) | 2022-08-01 |
JPWO2022157895A1 (ja) | 2022-07-28 |
KR20230132495A (ko) | 2023-09-15 |
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