JP5532479B2 - Mold inspection method, antiglare product haze prediction method, and antiglare product reflection image sharpness prediction method - Google Patents

Description

The present invention Rukin type inspection method can of using the uneven shape formed on the surface for a mold for molding a product that exhibits an antiglare effect, the antiglare product haze prediction method and antiglare product reflection image sharpness It relates to the prediction method.

  In order to manufacture a product having an antiglare effect, it is known that it is effective to form a fine uneven shape on the surface of the product. An example of an antiglare film having such a configuration is described in Japanese Patent Application Laid-Open No. 2006-53371 (Patent Document 1). In this document, in order to obtain an anti-glare film, it is supposed that a concavo-convex shape is provided in advance by causing fine particles to collide with the surface of a mold for forming the film.

JP 2006-53371 A

  When an uneven shape is formed on the surface of a mold and a product having an anti-glare effect is obtained by molding the product with the mold, the object to be directly subjected to the uneven shape forming process is a mold. Regardless, it is not known until the product is actually manufactured what optical characteristics appear in the product obtained from the mold. Therefore, conventionally, it was inconvenient because it was impossible to determine the suitability of the adjustment when preparing the mold. Further, when a product is manufactured for confirming the optical characteristics and the optical characteristics are confirmed, it is found that the product is defective. As a result, there is a problem that the product molded up to that point is wasted.

Therefore, the present invention relates to a mold for molding a product having an antiglare effect, and may be obtained in a product even if the product is not molded by the mold during or after the mold is manufactured. and to provide a mold inspection method can be used to estimate the optical properties, antiglare product haze prediction method and antiglare product reflection image sharpness prediction method.

In order to achieve the above object, a mold inspection method according to the present invention is a mold inspection method for forming a product exhibiting an antiglare effect by an uneven shape formed on a surface thereof. A step of projecting light from the light projecting fiber toward the inspection surface, a step of receiving reflected light from the surface to be inspected by one or more light receiving fibers, and an intensity of light received by the one or more light receiving fibers. Process. The light projecting step uses an optical fiber bundle arranged so as to surround the light projecting fiber with a plurality of light receiving fibers. The light projecting step is a first state in which any one of the plurality of light receiving fibers is positioned on an extension of a light path when the light emitted from the light projecting fiber is regularly reflected by the surface to be inspected. A first step in which the optical fiber bundle is arranged to irradiate light from the light projecting fiber, and the optical fiber bundle is arranged in a second state perpendicular to the surface to be inspected. And a second step of irradiating light from the light projecting fiber. The step of receiving light includes a third step of receiving light while performing the first step, and a fourth step of receiving light while performing the second step. The detecting step includes a step of detecting the intensity M1 of the light received in the third step and a step of detecting the intensity m1 of the light received in the fourth step. The inspection method further includes a step of obtaining m1 / (M1 + m1) as provisional haze using the intensity M1 and the intensity m1 .

  According to the present invention, instead of inspecting the product itself that exhibits the anti-glare effect by the uneven shape formed on the surface, the mold for molding such a product is inspected, Since the inspection surface is irradiated with light and the intensity of the reflected light is detected, the optical characteristics that will be obtained in the product can be obtained without molding the product with the mold during or after the mold is manufactured. Can be estimated.

It is a conceptual diagram of the metal mold | die inspection apparatus in Embodiment 1 based on this invention. It is an expansion perspective view of the edge part by the side of the measurement of the optical fiber bundle with which the metal mold | die inspection apparatus in Embodiment 1 based on this invention is provided. It is explanatory drawing of the mode of the concrete experiment relevant to Embodiment 1 based on this invention. It is sectional drawing of the edge part of the collimating lens unit with which the metal mold | die inspection apparatus in Embodiment 1 based on this invention is provided. It is a conceptual diagram of the metal mold | die inspection apparatus in Embodiment 2 based on this invention. It is sectional drawing of the optical fiber bundle with which the metal mold | die inspection apparatus in Embodiment 2 based on this invention is provided. It is explanatory drawing of the course of the light in the 1st state of the metal mold | die inspection apparatus in Embodiment 2 based on this invention. It is explanatory drawing of the course of the light in the 2nd state of the metal mold | die inspection apparatus in Embodiment 2 based on this invention. It is explanatory drawing corresponding to the 1st state of the metal mold | die inspection apparatus in Embodiment 2 based on this invention. It is explanatory drawing corresponding to the 2nd state of the metal mold | die inspection apparatus in Embodiment 2 based on this invention. It is a conceptual diagram of the metal mold | die inspection apparatus in Embodiment 3 based on this invention. It is sectional drawing of the edge part of the collimating lens unit with which the metal mold | die inspection apparatus in Embodiment 3 based on this invention is provided. It is sectional drawing of the edge part of the collimating lens unit with which the metal mold | die inspection apparatus in Embodiment 3 based on this invention is provided. It is a conceptual diagram of an example of the concrete structure of the metal mold | die inspection apparatus in Embodiment 3 based on this invention. It is a flowchart of the metal mold | die inspection method in Embodiment 4 based on this invention. It is a flowchart of the metal mold | die inspection method in Embodiment 5 based on this invention. It is a flowchart of the metal mold | die inspection method in Embodiment 6 based on this invention. It is a flowchart of the metal mold | die inspection method in Embodiment 7 based on this invention. It is a flowchart of the metal mold | die inspection method in Embodiment 8 based on this invention. It is a graph which shows the correlation with the haze calculated | required from the film, and the temporary haze calculated | required from the metal mold | die. It is a graph which shows the correlation of the reflected image definition calculated | required from the film, and the provisional reflected image definition calculated | required from the metal mold | die.

  One type of antiglare product is an antiglare film (also referred to as “AG (Anti-Glare) film”). As a method for producing an anti-glare film, there is a method in which an anti-glare treatment is performed on a film by transferring the surface shape of a mold having an uneven shape to the film surface. This method requires a technique for estimating optical characteristics of a product that will be obtained from the mold in the future during or after the mold is manufactured. In particular, there has been a strong demand for a technique for estimating the optical characteristics during the processing of a mold. However, a method for analyzing the surface shape of the mold and estimating the optical characteristics of the antiglare film produced using this mold from the obtained data has not yet been established. Therefore, the inventors analyzed the surface shape of the mold by some method to obtain data, and examined whether or not the optical characteristics of the produced antiglare product can be evaluated, and after trial and error. This led to the present invention.

  First, a basic concept of components related to the present invention will be described, and then each embodiment will be described.

(Anti-glare mold)
The “antiglare mold” is a mold having a concavo-convex shape of about several μm to several mm on the surface. This mold is usually used for transfer to a film by UV embossing or molding, and forms an antiglare surface on the workpiece. As the mold for anti-glare treatment, there may be used a mold in which the copper surface is etched and then hard scratched by hard chrome plating. In addition, a metal plate having fine irregularities formed on the surface by the bead shot method is also used as a mold for anti-glare treatment. Examples of the shape of the die include a plate shape and a roll shape die used in a roll-to-roll process.

(Light emitting fiber)
A “projection fiber” is an optical fiber that guides light emitted from a light emitter and irradiates light from one point toward a surface to be inspected. The light projecting fiber may be a single wire of a single mode or multimode optical fiber, and a configuration in which a plurality of optical fibers are bundled is also conceivable.

(Receiving fiber)
The “light receiving fiber” is an optical fiber that plays a role of guiding the light reflected from the surface to be inspected to the detection unit. The light projecting fiber may be a single wire of a single mode or multimode optical fiber, and a configuration in which a plurality of optical fibers are bundled is also conceivable.

(Optical fiber)
When the light projecting fiber or the light receiving fiber is constituted by a bundle of a plurality of optical fibers, the cross-sectional shape of the bundle may be a circle or an ellipse, and may be a quadrangle, a polygon, a ring, a line, etc. Also good. In order to facilitate the positioning of the optical fiber, the cross-sectional shape of the optical fiber bundle as a whole is preferably a shape having rotational symmetry, and particularly preferably a circular shape. When the inspection object is a curved surface having some curvature, such as when the inspection object is a cylindrical mold, according to the curvature, the obtained reflected light is close to a circle. It is preferable to use a bundle of optical fibers bundled in an elliptical shape. When the object to be inspected is a cylindrical mold, the reflected light obtained by irradiating light on an elliptical area with the cylindrical diameter direction as the major axis and the cylindrical central axis direction as the minor axis Becomes close to a circle.

  The diameter of the optical fiber to be used is not particularly limited, but the diameter of the optical fiber expected to have a good correlation with the sharpness is preferably 0.125 mm or more and 4 mm or less. Furthermore, the diameter of the optical fiber is more preferably 0.125 mm or more and 2 mm or less. When the light projecting fiber or the light receiving fiber is a single optical fiber, the diameter of the single wire is preferably set to a value within the above-described numerical range, and the light projecting fiber or the light receiving fiber is constituted by a bundle of optical fibers. In such a case, it is preferable to set the diameter of the bundle to a value within the numerical range described above. Further, it is preferable that the light projecting fiber and the light receiving fiber are arranged close to each other so as not to cause a level of crosstalk that hinders measurement through an interval equal to or smaller than the diameter of the light receiving fiber. Furthermore, in the configuration in which the light projecting fiber is disposed at the center and the light receiving fiber is disposed at the periphery, a light receiving fiber having a diameter smaller than that of the light projecting fiber can be preferably used. Particularly, it is preferably about 1/2 of the diameter of the light projecting fiber.

(light source)
As a light source, various light sources such as a light emitting diode (LED) and a laser element can be used in addition to a light bulb represented by a halogen lamp, a tungsten lamp, and a mercury lamp. As the light source, it is particularly preferable to use a solid light source such as an LED, a semiconductor laser element, or a semiconductor excitation laser element that can be easily modulated as necessary for noise removal.

  When a light bulb or LED is used as a light source, the light emitted from the optical fiber travels while spreading. However, in the present invention, the light emitted from the light projecting fiber needs to be substantially parallel light before reaching the surface to be inspected. For this reason, in the case where the light emitted from the optical fiber is light that travels while spreading, it is only necessary to appropriately combine lenses so as to make the light close to parallel light. Such an operation can generally be realized by a convex lens or a concave mirror. In addition, a lens that can make light emitted from the optical fiber almost parallel is commercially available from fiber sensor manufacturers. An example of such a lens is model F-3HA manufactured by Keyence Corporation. By combining this lens with a dedicated optical fiber (such as FU-35FZ manufactured by Keyence Corporation), substantially parallel light can be realized within a range of approximately 20 mm to 40 mm from the lens. F-3HA has an aperture diameter of about 4.3 mm and is provided with a convex lens, and is designed to be approximately parallel light with a spot diameter of about 4 mm at a position of 0 to 20 mm from the lens tip.

(Embodiment 1)
(Constitution)
With reference to FIGS. 1-4, the metal mold | die inspection apparatus in Embodiment 1 based on this invention is demonstrated. A conceptual diagram of a mold inspection apparatus according to the present embodiment is shown in FIG. The mold inspection apparatus 101 is a mold inspection apparatus for forming a product that exhibits an antiglare effect due to the uneven shape formed on the surface, and projects light toward the surface 1 a to be inspected of the mold 1. A light projecting fiber 11, one or more light receiving fibers 12 for receiving reflected light from the surface 1 a to be inspected, and a detecting unit 20 for detecting the intensity of light received by the one or more light receiving fibers 12. Is provided.

  The mold inspection apparatus 101 shown in FIG. 1 includes a plurality of light receiving fibers 12. The detection unit 20 includes a fiber sensor amplifier unit 21 and a microcontroller 22. Both the light projecting fiber 11 and the one or more light receiving fibers 12 are connected to the fiber sensor amplifier unit 21. The fiber sensor amplifier unit 21 is connected to the microcontroller 22.

  The mold inspection apparatus 101 includes a collimating lens unit 10. In FIG. 1, the collimating lens unit 10 faces obliquely downward, but is not limited to obliquely downward, and may be any orientation. FIG. 2 shows an enlarged end portion of the collimating lens unit 10. A light projecting region 11e from which light from the light projecting fiber 11 is emitted is disposed at the center, and a light receiving region 12e is disposed so as to surround the periphery thereof. The light receiving region 12e is annular. The light receiving region 12e is a region for the light receiving fiber 12 to receive light.

  A specific experiment is shown in FIG. The collimating lens unit 10 is fixed to the gantry 25, and light is irradiated toward the surface 1a to be inspected disposed below. The distance between the collimating lens unit 10 and the surface 1a to be inspected was about 20 mm. The surface 1a to be inspected is the surface of the roll-shaped mold 1. The irradiated light is a spot 2 having a diameter of 6 mm on the surface to be inspected 1a. An optical fiber bundle 13 extends from the upper end of the collimating lens unit 10 and is connected to a detection unit 20 not shown in FIG.

  An outline of the internal structure of the collimating lens unit 10 is shown in FIG. The end of the optical fiber bundle 13 is disposed inside the housing 15, and the collimator lens 14 is disposed at a position where the end of the optical fiber bundle 13 is in focus. The collimating lens 14 is held by a housing 15.

(Action / Effect)
In the mold inspection apparatus according to the present embodiment, instead of inspecting the product itself that exhibits the antiglare effect by the uneven shape formed on the surface, the mold for molding such a product is inspected. Because the surface to be inspected of the mold is irradiated with light and the intensity of the reflected light is detected, it is possible to estimate the optical characteristics that will be obtained in the product without molding the product with the mold. it can. Therefore, the situation where the product molded for the inspection is wasted can be avoided as much as possible.

(Embodiment 2)
(Constitution)
With reference to FIGS. 5-8, the metal mold | die inspection apparatus in Embodiment 2 based on this invention is demonstrated. As shown in FIG. 5, the mold inspection apparatus 102 in the present embodiment includes a plurality of light receiving fibers 12 for receiving reflected light from the surface 1a to be inspected. The plurality of light receiving fibers 12 are arranged so as to surround the light projecting fiber 11. The optical fiber bundle 13 in which the light projecting fiber 11 and the plurality of light receiving fibers 12 are combined has a plurality of light receiving fibers on the extension of the light path when the light emitted from the light projecting fiber 11 is regularly reflected by the surface 1a to be inspected. The first state where any one of 12 is located and the second state perpendicular to the surface 1a to be inspected can be taken in at least two ways.

  A cross section of the optical fiber bundle 13 is shown in FIG. In this example, six light receiving fibers 12 are arranged around one light projecting fiber 11. The number of light receiving fibers 12 is not limited to six and may be other numbers. For example, in FU-35FZ manufactured by Keyence Corporation used in the verification experiment described later, the number of light receiving fibers is eight.

  FIG. 5 shows the second state as apparent from the fact that the optical fiber bundle 13 is perpendicular to the surface 1a to be inspected. The mold inspection apparatus 102 includes a switching unit 16 for switching between the first state and the second state of the optical fiber bundle 13. The switching unit 16 can switch the direction of the optical fiber bundle 13 by a known technique. The switching unit 16 is not necessarily connected so as to directly operate the optical fiber bundle 13, but switches the state of the optical fiber bundle 13 by operating the direction of the collimating lens unit 10 as shown in FIG. It may be a thing.

(Action / Effect)
The light path in the first state is shown in FIG. 7, and the light path in the second state is shown in FIG. As shown in FIG. 7, in the first state, the optical fiber bundle 13 is slightly inclined from the perpendicular to the surface to be inspected 1a. The component specularly reflected by the inspection surface 1 a becomes reflected light 72 and enters one of the plurality of light receiving fibers 12. As shown in FIG. 8, in the second state, since the optical fiber bundle 13 is perpendicular to the surface to be inspected 1a, the light 71 emitted from the light projecting fiber 11 is regularly reflected by the surface to be inspected 1a. The resulting component becomes reflected light 72 and is incident on the light projecting fiber 11 again. Also in the first state and the second state, as a result of the light 71 entering the surface 1a to be inspected, the scattered light 73 is generated at an angle different from the reflected light 72 in addition to the reflected light 72. In the second state shown in FIG. 8, the scattered light 73 is mainly incident on the light receiving fiber 12.

  The light 71 and the reflected light 72 actually travel as a light beam having a constant cross-sectional area, but in FIGS. 7 and 8, the center line of the light beam is indicated by an arrow. Since each light beam has a constant cross-sectional area, even in the first state in which the reflected light 72 is incident on any of the plurality of light receiving fibers 12, the component incident on the light projecting fiber 11 of the reflected light 72 is completely absent. Not necessarily. Similarly, even in the second state in which the reflected light 72 is incident on the light projecting fiber 11, the component that is incident on any one of the plurality of light receiving fibers 12 in the reflected light 72 is not necessarily completely absent.

  7 and 8, the refraction by the collimating lens 14 is omitted for convenience of explanation, but the refraction angle is small even if the reflected light 72 is refracted by the collimating lens 14. Therefore, the two states as described above can be distinguished by the difference in the inclination of the optical fiber bundle 13.

  In the present embodiment, the single collimating lens unit 10 serves as both irradiation and light reception. However, the reflected and folded light rays are represented in a straight line, and further, the collimating lens unit 10 as the irradiation unit and the light receiving unit as the light receiving unit. FIGS. 9 and 10 show the collimating lens units 10 separately represented.

  FIG. 9 shows the first state. The reflected light 72 specularly reflected by the surface 1 a to be inspected is collected on the end face of the light receiving fiber 12 by the collimating lens 14 and is incident on the light receiving fiber 12.

  FIG. 10 shows the second state. The reflected light 72 specularly reflected by the surface to be inspected 1 a is collected on the end face of the light projecting fiber 11 by the collimating lens 14. Scattered light 73 traveling around the reflected light 72 is incident on the light receiving fiber 12.

  As described above, in the present embodiment, it is possible to detect the intensity of light incident on the light receiving fiber 12 in each of the first state and the second state. That is, in the first state, it is possible to grasp the intensity of the component specularly reflected by the surface to be inspected 1a in the light 71, and in the second state, the intensity of a part of the scattered light 73 caused by the light 71 is obtained. I can grasp it.

  Thereby, in this Embodiment, the intensity | strength of the component reflected regularly on the surface of a metal mold | die and the intensity | strength of the component reflected irregularly can be detected separately. The optical characteristics can be specified from the intensity information obtained in this way. That is, it is possible to estimate optical characteristics that will be obtained in a product without molding the product with a mold. Therefore, the situation where the product molded for the inspection is wasted can be avoided as much as possible.

(Embodiment 3)
(Constitution)
With reference to FIGS. 11-13, the metal mold | die inspection apparatus in Embodiment 3 based on this invention is demonstrated. As shown in FIG. 11, a mold inspection apparatus 103 according to the present embodiment is a mold inspection apparatus for forming a product that exhibits an antiglare effect due to the uneven shape formed on the surface. A light projecting fiber 11 for projecting light toward the surface 1a to be inspected, one or more light receiving fibers for receiving reflected light 72 from the surface 1a to be inspected, and light received by the one or more light receiving fibers And a detecting unit 20 for detecting the intensity of. Further, the mold inspection apparatus 103 includes a light receiving fiber bundle 17 including a plurality of light receiving fibers for receiving reflected light 72 from the surface 1a to be inspected. The light receiving fiber bundle 17 includes a first light receiving fiber 12f located at the center and a plurality of second light receiving fibers 12g surrounding the periphery of the first light receiving fiber 12f. The light receiving fiber bundle 17 is arranged so that the first light receiving fiber 12f is positioned on the extension of the light path when the light 71 emitted from the light projecting fiber 11 is regularly reflected by the surface to be inspected 1a.

  A cross section of the light receiving fiber bundle 17 is shown in FIG. In this example, six second light receiving fibers 12g are arranged around one first light receiving fiber 12f. The number of the second light receiving fibers 12g is not limited to six and may be other numbers.

  As shown in FIG. 11, the collimating lens unit 10 is provided at the tip of the light projecting fiber 11, but the collimating lens unit 10 may include optical fibers other than the light projecting fiber 11. The collimating lens unit 10 only needs to include at least the light projecting fiber 11. On the other hand, a collimating lens unit 10 i is provided at the tip of the light receiving fiber bundle 17.

  An outline of the internal structure of the collimating lens unit 10i is shown in FIG. The end of the light receiving fiber bundle 17 is disposed inside the housing 15, and the collimator lens 14 is disposed at a position where the end is in focus. The collimating lens 14 is held by a housing 15.

  An example of a specific configuration of the mold inspection apparatus 103 in the present embodiment is shown in FIG. Light emitted from the LED 30 as a light source enters the light projecting fiber 11 through the aspheric condenser lens 31. A collimating lens unit 10 is installed at the tip of the light projecting fiber 11. The light emitted from the collimating lens unit 10 and reflected by the surface to be inspected 1a enters the collimating lens unit 10i. Of the light receiving fiber bundle 17 connected to the tip of the collimating lens unit 10i, the first light receiving fiber 12f transmits light to the photodiode 32f, and the second light receiving fiber 12g transmits light to the photodiode 32g. The inspection unit 20 includes an LED driver 33 and an A / D converter 34. The LED driver 33 sends an instruction to the LED 30, and the A / D converter 34 converts the amount of light detected by the photodiodes 32f and 32g into a signal. In FIG. 14, the LED 30 and the photodiodes 32 f and 32 g are shown as being outside the inspection unit 20, but part or all of the LED 30 and the photodiodes 32 f and 32 g are provided as a part of the inspection unit 20. It may be. Further, a current / voltage conversion circuit (I / V conversion circuit) or an amplifier circuit may be provided between the A / D converter 34 and the photodiodes 32f and 32g as necessary. These circuits can be easily realized by an operational amplifier or the like. As the operational amplifier, for example, MCP6282-E / P manufactured by Microchip Technology Inc. can be employed.

  In FIG. 14, a part of the optical fibers connected to the collimating lens unit 10 extends downward and is marked with an X mark, which means that these optical fibers are not used. To do. Of the plurality of optical fibers held by the collimating lens unit 10, only the light projecting fiber 11 is used.

(Action / Effect)
In the present embodiment, the reflected light 72, which is a component of the light 71 regularly reflected by the surface 1a to be inspected, is incident on the first light receiving fiber 12f of the light receiving fiber bundle 17, and the light 71 is irregularly reflected by the surface 1a to be inspected. A part of the scattered light 73 that is the component is incident on the second light receiving fiber 12 g of the light receiving fiber bundle 17.

  Therefore, in the present embodiment, the same effect as in the second embodiment can be obtained. In the mold inspection apparatus 102 according to the second embodiment, in order to obtain the intensity of the component that is regularly reflected on the surface of the mold and the intensity of the component that is irregularly reflected, a total of two times in the first state and the second state. Although it is necessary to perform measurement, the mold inspection apparatus 103 according to the present embodiment has an advantage that it can be completed by one measurement because the light receiving fiber bundle 17 is provided.

  In the first to third embodiments, the diameter of the opening for receiving light from outside in the one or more light receiving fibers is larger than the diameter of the opening for emitting light to the outside in the light projecting fiber. Preferably they are the same or smaller. By adopting this configuration, the light receiving fiber can easily receive only a desired light component, and the probability of receiving an unwanted light component can be reduced. In addition, by adopting this configuration, the amount of light incident on the light receiving fiber greatly fluctuates due to a slight change in angle, so that a change in the intensity of light can be detected sensitively. .

(Embodiment 4)
(Inspection method)
With reference to FIG. 15, the mold inspection method in Embodiment 4 based on this invention is demonstrated. A flowchart of the mold inspection method in the present embodiment is shown in FIG. This mold inspection method is a mold inspection method for forming a product that has an antiglare effect due to the uneven shape formed on the surface, and is projected from a light projecting fiber toward the surface to be inspected of the mold. A step S1 of illuminating, a step S2 of receiving reflected light from the surface to be inspected by one or more light receiving fibers, and a step S3 of detecting the intensity of light received by the one or more light receiving fibers. The steps S1 to S3 do not mean that the step S2 is performed after the completion of the step S1, but the step S2 may be performed in parallel while performing the step S1. The same applies to steps S2 and S3 and steps S1 and S3.

  This mold inspection method can be performed using the mold inspection apparatus described in any of the first to third embodiments. In that case, what is necessary is just to light-project toward the to-be-inspected surface 1a from the light projection fiber 11 in process S1. In step S3, the intensity of light received by the light receiving fiber 12, the first light receiving fiber 12f, or the second light receiving fiber 12g may be detected by the detection unit 20.

(Action / Effect)
In the mold inspection method according to the present embodiment, instead of inspecting the product itself that exhibits the antiglare effect by the uneven shape formed on the surface, the mold for molding such a product is inspected. Because the surface to be inspected of the mold is irradiated with light and the intensity of the reflected light is detected, it is possible to estimate the optical characteristics that will be obtained in the product without molding the product with the mold. it can. Therefore, the situation where the product molded for the inspection is wasted can be avoided as much as possible.

(Embodiment 5)
(Inspection method)
With reference to FIG. 16, the metal mold | die inspection method in Embodiment 5 based on this invention is demonstrated. A flowchart of the mold inspection method in the present embodiment is shown in FIG. The mold inspection method in the present embodiment employs more preferable conditions in the mold inspection method described in the fourth embodiment. Since the mold inspection method in the present embodiment can be implemented using the mold inspection apparatus 102 described in the second embodiment, each symbol of the mold inspection apparatus 102 (see FIGS. 5 and 6) is used. This will be described below.

  In the mold inspection method in the present embodiment, the light projecting step S1 uses the optical fiber bundle 13 arranged so as to surround the light projecting fiber 11 with a plurality of light receiving fibers 12, and the light projecting step S1 is performed. The optical fiber bundle 13 is in a first state in which one of the plurality of light receiving fibers 12 is positioned on the extension of the light path when the light emitted from the light projecting fiber 11 is regularly reflected by the surface 1a to be inspected. The first step S11 for irradiating light from the light projecting fiber 11 and the optical fiber bundle 13 from the light projecting fiber 11 so as to be in a second state perpendicular to the surface 1a to be inspected. Including the second step S12 for performing the light irradiation, the light receiving step S2 includes the third step S13 for receiving light while performing the first step S11, and the fourth step S14 for receiving light while performing the second step S12. Wherein, the step S3 for detecting comprises a step of detecting the light intensity M1 received by the third step S13, and detecting the intensity of light m1 received by the fourth step S14. Either the first step S11 performed in the first state or the second step S12 performed in the second state may be performed first. Steps S1 and S2 are displayed on the flowchart of FIG. 16 as if they were related to each other, but since they are actually light irradiation and light reception, they may be performed almost simultaneously. Moreover, the time zone performed by process S1 and process S2 may overlap.

(Action / Effect)
In the mold inspection method according to the present embodiment, instead of inspecting the product itself that exhibits the antiglare effect by the uneven shape formed on the surface, the mold for molding such a product is inspected. Obtaining M1 corresponding to the intensity of light mainly composed of specularly reflected light and m1 corresponding to the intensity of light mainly composed of scattered light when the inspection surface of the mold is irradiated with light Can do. Based on the light intensities M1 and m1 thus obtained, it is possible to estimate the optical characteristics that will be obtained in the product. Therefore, it is possible to estimate the optical characteristics that will be obtained in the product without molding the product with a mold, and as a result, it is possible to avoid as much as possible the situation where the product molded for inspection is wasted.

(Embodiment 6)
(Inspection method)
With reference to FIG. 17, the mold inspection method in Embodiment 6 based on this invention is demonstrated. FIG. 17 shows a flowchart of the mold inspection method in the present embodiment. The mold inspection method in the present embodiment employs more preferable conditions in the mold inspection method described in the fourth embodiment. Since the mold inspection method in the present embodiment can be carried out using the mold inspection apparatus 103 described in the third embodiment, each symbol of the mold inspection apparatus 103 (see FIGS. 11 and 12) is used. This will be described below.

  In the mold inspection method in the present embodiment, the light projecting step S1 projects light in a direction not perpendicular to the surface to be inspected 1a, and the light receiving step S2 is performed by the first light receiving fiber 12f located at the center. Using the light receiving fiber bundle 17 arranged so as to surround the plurality of second light receiving fibers 12g, on the extension of the light path when the light emitted from the light projecting fiber 11 is regularly reflected by the surface to be inspected 1a. In step S3, the light receiving fiber bundle 17 is arranged so that the first light receiving fiber 12f is positioned to receive the reflected light from the surface 1a to be inspected, and the detection step S3 detects the intensity M1 of the light received by the first light receiving fiber 12f. Step S31 and step S32 of detecting the intensity m1 of the light received by the second light receiving fiber 12g.

(Action / Effect)
Also in the mold inspection method in the present embodiment, M1 corresponding to the intensity of light mainly composed of specularly reflected light and m1 corresponding to the intensity of light mainly composed of scattered light can be obtained. The same effects as in the fifth embodiment can be obtained. In the fifth embodiment, the detection has to be performed twice by switching the positional relationship of the apparatus between the first state and the second state. However, according to the mold inspection method in the present embodiment, the first state There is no need to switch the positional relationship between the apparatus and the second state, and M1 and m1 can be obtained quickly.

  Hereinafter, a more preferable aspect will be described with respect to the mold inspection method described in the fifth and sixth embodiments.

  It is preferable that the above-described mold inspection method further includes a step of obtaining m1 / (M1 + m1) as a temporary haze using the strength M1 and the strength m1. In this way, “provisional haze” is obtained as a parameter expected to be proportional to “haze”, which is a parameter that can be obtained by a predetermined method using a product manufactured from a mold. Can do. The provisional haze is convenient because it can be obtained from the mold itself without actually making a prototype from the mold.

  It is preferable that the above-described mold inspection method further includes a step of obtaining (M1−m1) / (M1 + m1) as the provisional reflected image definition using the intensity M1 and the intensity m1. In this way, “temporary reflected image definition” is obtained as a parameter having a meaning close to “reflected image definition” that is a parameter that can be obtained by a predetermined method using a product manufactured from a mold. Can do. In addition, the provisional reflection image definition is advantageous because it can be obtained from the mold itself without actually making a trial product from the mold.

  In the mold inspection method described above, the diameter of the opening for receiving light from the outside in the one or more light receiving fibers is larger than the diameter of the opening for emitting light to the outside in the light projecting fiber. Preferably they are the same or smaller. If this condition is satisfied, the light receiving fiber can easily receive only a desired light component, and the probability of receiving an unwanted light component can be reduced. In addition, since the amount of light incident on the light receiving fiber greatly fluctuates due to a slight change in angle, a change in light intensity can be detected sensitively.

(Embodiment 7)
(Prediction method)
With reference to FIG. 18, the anti-glare product haze prediction method in Embodiment 7 based on this invention is demonstrated. A flowchart of the anti-glare product haze prediction method in the present embodiment is shown in FIG.

  The anti-glare product haze prediction method in the present embodiment includes a step of performing the mold inspection method described in any of Embodiments 5 and 6 for the first mold and further obtaining the above-described provisional haze. A step S101 for performing, a step S102 for molding a product using the first mold, a step S103 for obtaining haze for the product by a method defined in Japanese Industrial Standard (hereinafter referred to as “JIS”) K7136, Step S104 for obtaining a haze proportionality coefficient from the ratio of the haze and the provisional haze, Step S105 for performing a mold inspection method for obtaining the provisional haze as described above for the second mold, and the second Step S106 for obtaining an estimated product haze by multiplying the provisional haze obtained from the mold by the haze proportionality coefficient.

(Action / Effect)
According to the anti-glare product haze prediction method in the present embodiment, the estimated product haze that is a parameter very close to the haze of a product to be manufactured in the future can be obtained without molding the product in the second mold. . Thereby, the situation where the product molded for the inspection is wasted can be avoided as much as possible.

  Actually, once the steps S101 to S104 are performed for the first mold and the haze proportionality coefficient is obtained, the processes S105 and S106 for the second mold are performed for one type of mold. In addition, it can be performed on a plurality of types of molds. That is, a plurality of second molds may exist. According to the present embodiment, for a plurality of types of molds, an estimated product haze is obtained based on the haze proportionality coefficient already known from the first mold without actually manufacturing a product from each mold. Can be obtained respectively, which is preferable.

(Embodiment 8)
(Prediction method)
With reference to FIG. 19, the anti-glare product reflected image definition prediction method in Embodiment 8 based on this invention is demonstrated. FIG. 19 shows a flowchart of the anti-glare product reflected image definition prediction method according to the present embodiment.

  The anti-glare product reflected image sharpness prediction method in the present embodiment performs the mold inspection method described in any of the fifth and sixth embodiments for the first mold, and further, the provisional reflected image described above. A step S201 of performing a step of obtaining a sharpness, a step S202 of forming a product using the first mold, a step S203 of obtaining a reflected image definition by a method defined in JIS K7105 for the product, A step S204 for obtaining a reflected image sharpness proportionality factor from a ratio between the reflected image sharpness and the provisional reflected image sharpness, and a step S205 for performing the mold inspection method according to claim 9 for the second mold. And a step S206 of obtaining an estimated product reflected image definition by multiplying the provisional reflected image definition obtained from the second mold by the reflected image definition factor.

(Action / Effect)
According to the anti-glare product reflected image sharpness prediction method in the present embodiment, the estimated product is a parameter very close to the reflected image sharpness of a product to be manufactured in the future without molding the product in the second mold. The sharpness of the reflected image can be obtained. Thereby, the situation where the product molded for the inspection is wasted can be avoided as much as possible.

  Actually, once the steps S201 to S204 are performed for the first mold and the reflected image sharpness proportionality coefficient is obtained, the processes S205 and S206 for the second mold are performed with one type of mold. Not only for molds, but also for multiple types of molds. That is, a plurality of second molds may exist. According to the present embodiment, for a plurality of types of molds, without actually manufacturing a product from each mold, based on the reflection image sharpness proportional coefficient already known from the first mold, It is preferable because the estimated product reflection image definition can be obtained.

  In the seventh and eighth embodiments, one type of first mold may be used, but it is preferable to obtain a proportionality coefficient by using a plurality of molds having different characteristic values as the first mold. In order to obtain one proportional coefficient to be finally adopted from a plurality of proportional coefficients respectively obtained from a plurality of molds, for example, a least square method may be used. As an equation assumed at this time, for example, y = a × x can be used. Here, y is provisional haze or provisional reflected image definition, x is haze or reflected image definition, and a is a proportional coefficient to be obtained.

(Verification experiment)
The estimated product haze and estimated product reflected image definition obtained from the mold by the prediction methods shown in the seventh and eighth embodiments are the same as the haze and reflected image definition obtained from the product manufactured using the mold. In order to confirm the degree of agreement, the inventors conducted the following experiment.

(Experiment 1)
As Experiment 1, the mold inspection apparatus 102 (see FIGS. 5 to 8) described in the second embodiment was prepared, and the mold was irradiated with light and the reflected light was observed. In this experiment, a FU-35FZ center side fiber manufactured by Keyence Corporation as the projecting fiber 11, a peripheral fiber of FU-35FZ manufactured by Keyence Corporation as the receiving fiber 12, and an F-3HA manufactured by Keyence Corporation as the collimating lens unit 10 were used. Using.

  In FU-35FZ, an optical fiber bundle in which a large number of optical fibers having a diameter of about 0.05 mm are bundled in a circular shape having a diameter of about 0.5 mm is arranged at the center of a circular region having a diameter of about 1.1 mm. The configuration is such that eight optical fibers having a diameter of about 0.265 mm surround the periphery. If the optical fiber bundle arranged in the center is regarded as an integrated optical fiber, the diameter of the optical fiber in the peripheral part is smaller than the diameter of the optical fiber arranged in the central part, compared with the optical fiber arranged in the central part. It will have a diameter of about 1/2. Moreover, the gap of the optical fiber between the central part and the peripheral part calculated from the above information is 0.035 mm or less. The optical fiber bundle at the center corresponds to the light projecting fiber 11, and the eight optical fibers at the periphery correspond to the light receiving fiber 12. F-3HA as the collimating lens unit 10 has an aperture diameter of about 4.3 mm and a convex lens so that the collimating lens unit 10 has substantially parallel light with a spot diameter of about 4 mm at a position of 0 to 20 mm from the lens tip. Designed.

  First, in order to realize the first state, F-3HA as the collimating lens unit 10 was installed with a slight shift from the position facing the surface 1a to be inspected. This angle is such that the specularly reflected light returning from the surface to be inspected 1a as the measurement object due to the light emitted from the light projecting fiber 11 arranged at the center of the FU-35FZ is reflected in the peripheral part of the FU-35FZ It is set so as to enter the arranged fiber bundle, that is, the plurality of light receiving fibers 12. The light projecting fiber 11 was connected to the “light projecting” side of a fiber amplifier FS-V31M manufactured by Keyence Corporation, and the light receiving fiber 12 was connected to the “light receiving” side of the machine. Furthermore, the analog output (1V to 5V) of FS-V31M was connected to a 12-bit A / D converter. A 12-bit A / D converter mounted on a microcontroller dsPIC30F4013-30I / P manufactured by Microchip Technology Inc was used as the A / D converter. The sampling time of the analog input was 10 μsec, and the average value measured 150 times was calculated by dsPIC30F4013-30I / P. The obtained 12-bit integer value was sent to the RS232C serial port of the personal computer via the ADM3202A, which is an RS232C level conversion IC manufactured by Analog Devices, using the UART function mounted on the microcontroller. By this measurement, a measurement value of strength M1 was obtained.

  Next, in order to implement | achieve a 2nd state, F-3HA as the collimating lens unit 10 was installed facing the measuring object surface. In this posture, the specularly reflected light returning from the surface to be inspected 1a as the measurement object due to the light emitted from the light projecting fiber 11 arranged at the center of the FU-35FZ is the central part of the FU-35FZ. Return to the fiber bundle, that is, the projecting fiber 11. The connection relationship between the light projecting fiber 11 and the light receiving fiber 12 is the same as that in the first state described above. The sampling time for analog input and the sending method to the personal computer are the same as those in the first state. By this measurement, a measured value of strength m1 was obtained.

  Next, using the obtained intensities M1 and m1, provisional haze and provisional reflected image definition are obtained as a guide instead of haze and reflected image definition, which are typical characteristic parameters desired to know about the anti-glare processing mold. It was. By definition, (M1−m1) / (M1 + m1) corresponds to provisional reflection definition, and m1 / (M1 + m1) corresponds to provisional haze.

A film was actually produced using this mold. Making a film using a mold means that the surface shape of the mold is transferred to the surface of the film. By transferring in this way, the surface of the film can be subjected to an antiglare treatment. In the experiment, the UV embossing method was used for transferring the uneven shape. Specifically, a photocurable resin composition GRANDIC 806T (Dainippon Ink Chemical Co., Ltd.) is dissolved in ethyl acetate to obtain a 50 wt% solution, and further, a photopolymerization initiator, lucillin TPO. A coating solution was prepared by adding 5 parts by weight (100 parts by weight of curable resin component) of BASF Corporation (chemical name: 2,4,6-trimethylbenzoyldiphenylphosphine oxide). Thereafter, this coating solution was applied onto a 80 μm thick triacetylcellulose (TAC) film so that the coating thickness after drying was 10 μm, and dried in a drier set at 60 ° C. for 3 minutes. The dried film was brought into close contact with the concavo-convex surface of the previously produced mold with a rubber roll so that the photocurable resin composition layer was on the mold side. In this state, light from a high-pressure mercury lamp with an intensity of 20 mW / cm ² was irradiated from the TAC film side so that the amount of light in terms of h-line was 200 mJ / cm ² to cure the photocurable resin composition layer. The layer thus cured is referred to as a “cured resin layer”. Thereafter, the TAC film was peeled from the mold together with the cured resin layer to obtain a transparent antiglare film comprising a laminate of the cured resin layer having irregularities on the surface and the TAC film.

  M and m were measured from the film thus obtained by the method defined in JIS K7105, and the sharpness of the reflected image as an optical characteristic was derived. Here, the parameters M and m without the subscript “1” are parameters defined in JIS K7105. About haze, based on JISK7136, it measured with the haze and transmittance meter HM-150 made from Murakami Color Research Laboratory. Details will be described later.

  The contents defined in JIS K7105 will be briefly described. According to JIS K7105, light emitted from a light source and transmitted through a slit is converted into parallel light by a lens, the parallel light is irradiated at 45 ° to the sample, and reflected light is received through an optical comb. Has been. The width of the slit is 0.03 ± 0.005 mm. The optical comb has a ratio of the width of the dark part to the bright part of 1: 1, and four kinds of widths of 0.125 mm, 0.5 mm, 1.0 mm, and 2.0 mm are used. The optical comb is moved at a speed of about 10 mm / min. First, the optical comb is moved with the black glass reference surface attached in place of the sample on the sample mounting base, and the received light waveform is recorded. In this case, the recording in the dark part of the optical comb is adjusted to zero. Next, the sample is placed on the sample mounting base, and the optical comb is moved and adjusted so that the highest wave height recorded is at an appropriate position on the recording paper. For the measurement, the above-described four types of optical combs are used, the optical comb is moved within a predetermined width, and the maximum wave height that can be read from the recording paper is M, and the minimum wave height is m. Using these parameters M and m, the reflected image definition is obtained as (M−m) / (M + m). The reflected image definition was measured by a chromaticity measuring device ICM-1T manufactured by Suga Test Instruments Co., Ltd. based on JIS K7105.

  About haze, it measured based on JIS K7136 with the haze and the transmittance | permeability meter HM-150 made from Murakami Color Research Laboratory Co., Ltd. for the measuring object the 80-micrometer-thick triacetylcellulose film transcribe | transferred the shape from the metal mold | die. did. This measurement will be described.

  According to JIS K7136, haze is defined as “percentage of transmitted light transmitted through the test piece that is 0.044 rad (2.5 °) or more away from incident light due to forward scattering”. . That is, the haze is a percentage of the scattered transmitted light amount in the total light transmitted light amount. In the anti-glare treatment realized by providing an uneven shape on the surface of the transparent substrate, the amount of scattered light varies depending on the refractive index of the transparent substrate on which the uneven shape is formed. However, assuming that the refractive index of the base material is almost constant and haze is expressed by the uneven shape, it can be applied to the system by estimating the ratio of the scattered light amount due to the uneven shape of the mold to the total amount of light irradiated. It is considered that haze can be estimated by obtaining a proportional coefficient. For the purpose of estimating the ratio of scattered light to the total light irradiated on the mold, it is assumed that the amount corresponding to the amount of scattered light is m1 and the amount corresponding to the total amount of light is (M1 + m1). “Provisional haze” was defined as m1 / (M1 + m1). The provisional haze defined in this way is considered to be proportional to the haze of the antiglare product realized by imparting an uneven shape to the surface of the transparent substrate having a substantially constant refractive index.

FIG. 20 shows the correlation between the haze obtained from the film and the provisional haze obtained from the mold. FIG. 21 shows the correlation between the reflected image definition obtained from the film and the provisional reflected image definition obtained from the mold. Here, the value shown as the reflected image definition is the sum of the respective measured values obtained by three types of optical combs having a width of 0.5 mm, 1.0 mm, and 2.0 mm. As apparent from FIGS. 20 and 21, it was found that both showed a good correlation. R ² described in the upper left of FIGS. 20 and 21 represents a correlation coefficient.

  The haze proportionality coefficient can be obtained from the ratio of haze to provisional haze. As shown in FIG. 20, since it was found that the temporary haze obtained from the mold is 0.3955 times the haze obtained from the product, the haze proportionality coefficient is 2.528 as the reciprocal of 0.3955.

  From the ratio between the reflected image definition and the provisional reflected image definition, the reflected image definition factor can be obtained. As shown in FIG. 21, since it was found that the provisional reflected image definition obtained from the mold is 0.0062 times the reflected image definition obtained from the product, the reflected image definition factor is 0.0062. The reciprocal is 161.29.

  It was found that there is such a correlation between the provisional haze and provisional reflected image definition obtained from the mold and the haze and reflected image definition obtained from the film. Even if a film is not prepared, the provisional haze and provisional reflected image sharpness are obtained in the mold, and the product is obtained by multiplying the corresponding one of the haze proportional coefficient and the reflected image sharpness proportional coefficient. It became possible to predict the wax haze and the sharpness of the reflected image. The parameters obtained by multiplying the proportional coefficient in this way become the estimated product haze and the estimated product reflected image definition.

  As described above, it has been clarified that the optical characteristics of the anti-glare mold can be measured only by using a very compact and simple optical system having a tip diameter of about 5 mm.

(Experiment 2)
As Experiment 2, the apparatus shown in FIG. 14 was prepared and measured. In Experiment 1, a total of two measurements were required in the first state and the second state, but in Experiment 2, M1 and m1 can be measured once.

  A combination of F-3HA manufactured by Keyence Corporation and FU-35FZ manufactured by Keyence Corporation was used as the light receiving fiber bundle 17. A fiber bundle having an opening at the center corresponds to the first light receiving fiber 12f, and a fiber bundle having an opening at the periphery corresponds to the second light receiving fiber 12g. The collimating lens unit 10i was installed at a position where the light irradiated from the collimating lens unit 10 can receive the light reflected by the mold surface, that is, the surface 1a to be inspected.

  As the LED 30 serving as a light source, a light emitting diode LXHL-LE3C manufactured by Philips Lumileds Lighting Company was used. As the aspherical condenser lens 31, two product codes 43987-K (aspherical condenser lens, outer diameter 27 mm, effective focal length 13 mm) sold by Edmund Optics Japan KK were used. Light was introduced into the light projecting fiber 11 via the aspheric condenser lens 31.

  Light was irradiated from the light projecting fiber 11 toward the surface 1a to be inspected, and the intensity of light transmitted by the first and second light receiving fibers 12f and 12g was detected by a photodiode SFH-213 manufactured by Osram Opto Semiconductors Inc.

  The intensity of light transmitted through the first light receiving fiber 12f was measured as M1, and the intensity of light transmitted through the second light receiving fiber 12g was measured as m1. After conversion to a 12-bit integer by an A / D converter, m1 / (M1 + m1) was calculated by a microcontroller to obtain provisional haze, and (M1−m1) / (M1 + m1) was calculated to obtain provisional reflected image definition.

By multiplying the haze proportionality coefficient and a reflection image sharpness proportionality coefficient obtained in Experiment 1 to these values, respectively, Uhe size and the reflection image sharpness will occur products made by the antiglare mold That is, the estimated product haze and the estimated product reflection image definition can be known.

  DESCRIPTION OF SYMBOLS 1 Mold | die, 1a to-be-inspected surface, 2 spots, 10,10i collimating lens unit, 11 light projecting fiber, 11e light projecting area, 12 light receiving fiber, 12e light receiving area, 12f 1st light receiving fiber, 12g 2nd light receiving fiber, 13 Optical fiber bundle, 14 collimating lens, 15 housing, 16 switching section, 17 light receiving fiber bundle, 20 detection section, 21 fiber sensor amplifier unit, 22 microcontroller, 25 mount, 30 LED, 31 aspheric condenser lens, 32f, 32g Photodiode, 33 LED driver, 34 A / D converter, 71 light, 72 reflected light, 73 scattered light, 101, 102, 103 Mold inspection apparatus.

Claims (7)

A mold inspection method for molding a product having an antiglare effect due to the uneven shape formed on the surface,
Projecting from the projection fiber toward the surface to be inspected of the mold,
Receiving reflected light from the surface to be inspected by one or more light receiving fibers;
Detecting the intensity of light received by the one or more light receiving fibers,
The light projecting step uses an optical fiber bundle arranged so as to surround the light projecting fiber with a plurality of light receiving fibers,
The step of projecting includes
The optical fiber bundle is arranged so that one of the plurality of light receiving fibers is positioned on an extension of the light path when the light emitted from the light projecting fiber is regularly reflected by the surface to be inspected. A first step of irradiating light from the light projecting fiber;
A second step of irradiating light from the light projecting fiber by arranging the optical fiber bundle so as to be in a second state perpendicular to the surface to be inspected,
The step of receiving light includes a third step of receiving light while performing the first step, and a fourth step of receiving light while performing the second step,
The detecting step, viewed contains a step of detecting the light intensity M1 received at said third step, and detecting the intensity of light m1 received at said fourth step,
The inspection method further includes a step of obtaining m1 / (M1 + m1) as a temporary haze using the strength M1 and the strength m1 . A mold inspection method for molding a product having an antiglare effect due to the uneven shape formed on the surface,
Projecting from the projection fiber toward the surface to be inspected of the mold,
Receiving reflected light from the surface to be inspected by one or more light receiving fibers;
Detecting the intensity of light received by the one or more light receiving fibers,
The step of projecting light projects in a direction that is not perpendicular to the surface to be inspected,
In the light receiving step, light emitted from the light projecting fiber is used as a surface to be inspected by using a light receiving fiber bundle arranged so that a plurality of second light receiving fibers surround the first light receiving fiber located at the center. Receiving the reflected light from the surface to be inspected by arranging the light receiving fiber bundle so that the first light receiving fiber is positioned on the extension of the light path when regularly reflected by
The detecting step, viewed contains a step of detecting the light intensity M1 of light received by the first light receiving fiber, and detecting the light intensity m1 of light received by the second light receiving fiber,
The inspection method further includes a step of obtaining m1 / (M1 + m1) as a temporary haze using the strength M1 and the strength m1 . A mold inspection method for molding a product having an antiglare effect due to the uneven shape formed on the surface,
Projecting from the projection fiber toward the surface to be inspected of the mold,
Receiving reflected light from the surface to be inspected by one or more light receiving fibers;
Detecting the intensity of light received by the one or more light receiving fibers,
The light projecting step uses an optical fiber bundle arranged so as to surround the light projecting fiber with a plurality of light receiving fibers,
The step of projecting includes
The optical fiber bundle is arranged so that one of the plurality of light receiving fibers is positioned on an extension of the light path when the light emitted from the light projecting fiber is regularly reflected by the surface to be inspected. A first step of irradiating light from the light projecting fiber;
A second step of irradiating light from the light projecting fiber by arranging the optical fiber bundle so as to be in a second state perpendicular to the surface to be inspected,
The step of receiving light includes a third step of receiving light while performing the first step, and a fourth step of receiving light while performing the second step,
The detecting step includes a step of detecting the intensity M1 of the light received in the third step, and a step of detecting the intensity m1 of the light received in the fourth step,
The inspection method further includes a step of obtaining (M1−m1) / (M1 + m1) as a provisional reflected image definition using the intensity M1 and the intensity m1. A mold inspection method for molding a product having an antiglare effect due to the uneven shape formed on the surface,
Projecting from the projection fiber toward the surface to be inspected of the mold,
Receiving reflected light from the surface to be inspected by one or more light receiving fibers;
Detecting the intensity of light received by the one or more light receiving fibers,
The step of projecting light projects in a direction that is not perpendicular to the surface to be inspected,
In the light receiving step, light emitted from the light projecting fiber is used as a surface to be inspected by using a light receiving fiber bundle arranged so that a plurality of second light receiving fibers surround the first light receiving fiber located at the center. Receiving the reflected light from the surface to be inspected by arranging the light receiving fiber bundle so that the first light receiving fiber is positioned on the extension of the light path when regularly reflected by
The detecting step includes a step of detecting an intensity M1 of light received by the first light receiving fiber, and a step of detecting an intensity m1 of light received by the second light receiving fiber,
The inspection method further includes a step of obtaining (M1−m1) / (M1 + m1) as a provisional reflected image definition using the intensity M1 and the intensity m1. The diameter of the opening for receiving light from outside in the one or more light receiving fibers is the same or smaller than the diameter of the opening for emitting light to the outside in the light projecting fiber. Item 5. A mold inspection method according to any one of Items 1 to 4 . Performing the mold inspection method according to claim 1 or 2 for the first mold;
Forming a product using the first mold;
About the said product, the process of calculating | requiring haze by the method defined in Japanese Industrial Standard K7136,
Obtaining a haze proportionality coefficient from the ratio of the haze and the provisional haze;
Performing the mold inspection method according to claim 1 or 2 for a second mold;
An anti-glare product haze prediction method including a step of multiplying the temporary haze obtained from the second mold by the haze proportionality coefficient to obtain an estimated product haze. Performing the mold inspection method according to claim 3 or 4 for the first mold;
Forming a product using the first mold;
About the said product, the process of calculating | requiring a reflected image definition by the method defined in Japanese Industrial Standard K7105,
Obtaining a reflected image sharpness proportional coefficient from a ratio between the reflected image sharpness and the provisional reflected image sharpness;
Performing the mold inspection method according to claim 3 or 4 for the second mold;
A step of obtaining an estimated product reflected image sharpness by multiplying the provisional reflected image sharpness obtained from the second mold by the reflected image sharpness proportional coefficient to obtain an estimated product reflected image sharpness. Prediction method.

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