Resin flow direction inspection device and resin flow direction inspection method

Abstract

To inspect the direction of flow of resin on the entire area of a resin molded component to easily visualize the direction of flow of resin.SOLUTION: A resin flow direction inspection device rotates a rotation color filter unit 11 by at least 180 degrees, the rotation color filter unit formed with a first color filter that passes a first color through a diaphragm hole for passing only regular reflection light parallel to an optical axis of an object-side telecentric optical system and is formed with a second color filter that extends in a filter arrangement direction A on an outer peripheral part of the diaphragm hole and passes a second color, sequentially acquires surface images D1-D3 of a resin molded component along with the rotation and associates the surface images and a rotation angle in the filter arrangement direction A with each other, creates, for the surface images D1-D3, partial flow direction images D11-D13 obtained by drawing line segments estimating the filter arrangement direction A as a flow direction in areas corresponding to image areas E11, E12, E21, E31 having only a color component value of the first color, and creates an image obtained by combining the partial flow direction images D11-D13 as a resin flow direction image D20.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a resin flow direction inspection device and a resin flow direction inspection method that can inspect the resin flow direction in a resin molded part in a planar manner and easily visualize the resin flow direction. [Background technology]

[0002] Traditionally, most resin-molded parts, such as plastic components, are formed by injection molding. Injection molding can result in weld lines, which are linear marks caused by the joining of resin flows, and sink marks, which are depressions. Since weld lines and sink marks not only result in poor appearance but also reduce strength, it is important to inspect the resin flow within the mold during injection molding to reduce defects such as weld lines and sink marks.

[0003] This resin flow within the mold can be determined by inspecting the resin flow of the resin molded part. Generally, resin molded parts contain reinforcing fillers, especially needle-shaped fillers, so the direction of resin flow can be determined by examining the orientation of these fillers. Conventionally, to examine the orientation of these fillers, the resin molded part was crushed and the cross section was observed using an electron microscope or similar.

[0004] Patent Document 1 discloses an optical arrangement in which a beam from a white light source is passed through a pinhole and directed onto a plane to be inspected, the reflected light is returned to the objective lens and passed through a beam splitter near the focal plane, and a plurality of concentric rings are provided on the focal plane, with different color filters arranged for each band of the rings, and the light passing through the filters is colored according to the magnitude of the tilt angle of the object to be inspected, thereby displaying the color distribution in color. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 63-26512 Summary of the Invention [Problem to be solved by the invention]

[0006] When examining the orientation of fillers using an electron microscope or the like, it is possible to pinpoint the direction of resin flow, but it is difficult to determine the direction of resin flow that is continuous across a surface. Furthermore, when examining the orientation of fillers using an electron microscope or the like, preprocessing such as crushing and cutting the resin molded part is required, which makes the inspection process laborious.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide a resin flow direction inspection device and a resin flow direction inspection method that can inspect the resin flow direction in a resin molded part on a planar basis and easily visualize the resin flow direction. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the object, the present invention provides a resin flow direction inspection device for inspecting the resin flow direction in one or more resin molded parts, the device comprising: a large-diameter convex lens forming an object-side telecentric optical system; Light from a large-diameter convex lens A second color is passed through a diaphragm hole that passes only specularly reflected light parallel to the optical axis on the object side with the optical axis as the center at the position where the axis passes. 1 A color filter is formed, and the outer periphery of the aperture hole is The large-diameter convex lens The aperture is provided in the filter arrangement direction passing through the image side focal position and directed radially outward from the aperture hole. The direction is the same but the direction is opposite a second color filter disposed in both directions and passing a second color different from the first color is formed to pass diffused light; A fan-shaped portion of the outer periphery that is perpendicular to the filter arrangement direction and has an angle of at least 90 degrees in the circumferential direction around a line passing through the optical axis The outer peripheral portion other than the second color filter is shielded from light. and a lens element arranged perpendicular to the optical axis at the image side focal position of the large diameter convex lens.The present invention is characterized by comprising a color filter unit, a rotation drive unit that rotates the color filter unit and / or the resin molded part relatively by at least 180 degrees around the optical axis, an imaging unit that sequentially acquires surface images of the resin molded part as the color filter unit rotates, a matching unit that matches the surface images acquired by the imaging unit with the rotation angle of the filter arrangement direction, and a flow direction image generation unit that draws line segments that estimate the filter arrangement direction as the flow direction in an area corresponding to an image area containing only the color component values ​​of the first color for each surface image that is sequentially acquired as the rotation occurs, and generates an image that combines the line segments drawn for each surface image as a resin flow direction image.

[0009] The present invention also provides a resin flow direction inspection device for inspecting a resin flow direction in one or more resin molded parts, the device comprising: a large-diameter convex lens forming an object-side telecentric optical system; Light from a large-diameter convex lens A second color is passed through a diaphragm hole that passes only specularly reflected light parallel to the optical axis on the object side with the optical axis as the center at the position where the axis passes. 1 A color filter is formed, and the outer periphery of the aperture hole is The large-diameter convex lens The aperture is provided in the filter arrangement direction passing through the image side focal position and directed radially outward from the aperture hole. The direction is the same but the direction is opposite a second color filter disposed in both directions and passing a second color different from the first color is formed to pass diffused light; A fan-shaped portion of the outer periphery that is perpendicular to the filter arrangement direction and has an angle of at least 90 degrees in the circumferential direction around a line passing through the optical axis The outer peripheral portion other than the second color filter is shielded from light. and a lens element arranged perpendicular to the optical axis at the image side focal position of the large diameter convex lens.The device is characterized by comprising a color filter unit, a rotation drive unit that rotates the color filter unit and / or the resin molded component relatively by at least 180 degrees around the optical axis, an imaging unit that sequentially acquires surface images of the resin molded component as the color filter unit rotates, a matching unit that matches the surface images acquired by the imaging unit with the rotation angle of the filter arrangement direction, and a flow direction image generation unit that draws line segments with a flow direction perpendicular to the filter arrangement direction in areas corresponding to image areas where the second color component value, which is the color component value of the second color, is equal to or greater than a predetermined value for each surface image that is sequentially acquired as the rotation occurs, and generates an image that combines the line segments drawn for each surface image as a resin flow direction image.

[0010] In the present invention, the flow direction image is obtained by interpolating each line segment using a curve.

[0011] In the above invention, the resin molded part may further contain needle-like or fibrous filler.

[0012] In the present invention, the surface image is a surface image of two or more combined resin molded parts.

[0013] The present invention also provides a resin flow direction inspection method for inspecting a resin flow direction in one or more resin molded parts, comprising: Light from a large-diameter convex lens A second color is passed through a diaphragm hole that passes only specularly reflected light parallel to the optical axis on the object side with the optical axis as the center at the position where the axis passes. 1 A color filter is formed, and the outer periphery of the aperture hole is The large-diameter convex lens The aperture is provided in the filter arrangement direction passing through the image side focal position and directed radially outward from the aperture hole. The direction is the same but the direction is opposite a second color filter disposed in both directions and passing a second color different from the first color is formed to pass diffused light; A fan-shaped portion of the outer periphery that is perpendicular to the filter arrangement direction and has an angle of at least 90 degrees in the circumferential direction around a line passing through the optical axis The outer peripheral portion other than the second color filter is shielded from light. and a lens element arranged perpendicular to the optical axis at the image side focal position of the large diameter convex lens.The method includes an imaging step of providing a color filter unit, rotating the color filter unit and / or the resin molded part relatively around the optical axis by at least 180 degrees, sequentially acquiring surface images of the resin molded part as the rotation occurs, and associating the acquired surface images with the rotation angle of the filter arrangement direction; and a flow direction image generation step of drawing lines, estimated to be the filter arrangement direction as the flow direction, in an area corresponding to an image area containing only color component values ​​of the first color for each surface image sequentially acquired as the rotation occurs, and generating an image by combining the line segments drawn for each surface image as a resin flow direction image.

[0014] The present invention also provides a resin flow direction inspection method for inspecting a resin flow direction in one or more resin molded parts, comprising: Light from a large-diameter convex lens A first color filter that passes a first color is formed in an aperture hole that passes only specularly reflected light parallel to the optical axis on the object side with the optical axis as the center at a position where the axis passes, and a first color filter that passes a first color is formed in the aperture hole on the outer periphery The large-diameter convex lens The aperture is provided in the filter arrangement direction passing through the image side focal position and directed radially outward from the aperture hole. The direction is the same but the direction is opposite a second color filter disposed in both directions and passing a second color different from the first color is formed to pass diffused light; A fan-shaped portion of the outer periphery that is perpendicular to the filter arrangement direction and has an angle of at least 90 degrees in the circumferential direction around a line passing through the optical axis The outer peripheral portion other than the second color filter is shielded from light. and a lens element arranged perpendicular to the optical axis at the image side focal position of the large diameter convex lens. The method includes an imaging step of providing a color filter unit, rotating the color filter unit and / or the resin molded component relatively around the optical axis by at least 180 degrees, sequentially acquiring surface images of the resin molded component as the rotation occurs, and associating the acquired surface images with the rotation angle of the filter arrangement direction; and a flow direction image generation step of drawing line segments, with the flow direction being perpendicular to the filter arrangement direction, in areas corresponding to image areas where the second color component value, which is the color component value of the second color, is equal to or greater than a predetermined value for each surface image sequentially acquired as the rotation occurs, and generating an image by combining the line segments drawn for each surface image as a resin flow direction image. [Effects of the Invention]

[0015] According to the present invention, the flow direction of resin in a resin molded part can be inspected planarly, and the flow direction of resin can be easily visualized. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a resin flow direction inspection device according to this embodiment. [Figure 2] FIG. 2 is a diagram showing the configuration of an imaging camera and an example of specularly reflected light and diffused light. [Figure 3] FIG. 3 is a diagram showing the configuration of the rotary color filter unit. [Figure 4] FIG. 4 is a diagram showing an imaging area on the surface that is imaged by an imaging camera. [Figure 5] Figure 5 shows an example of multiple surface images of an imaging area of ​​the surface captured while rotating a rotary color filter unit, partial flow direction images generated based on each surface image, and a flow direction image synthesized from each partial flow direction image. [Figure 6] FIG. 6 is a diagram showing an example of a flow direction image obtained by curved line interpolation. [Figure 7] FIG. 7 is a flowchart showing the flow direction image generation processing procedure performed by the control unit. [Figure 8] FIG. 8 is an explanatory diagram illustrating generation of a partial flow direction image according to a modified example. [Figure 9] FIG. 9 is a diagram showing an example in which an image region of only the first color on the surface image has an arbitrary shape. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, a resin flow direction inspection device and a resin flow direction inspection method according to the present embodiment will be described with reference to the accompanying drawings.

[0018] <Summary configuration> FIG. 1 is a schematic diagram showing the configuration of a resin flow direction inspection device 1 according to this embodiment. As shown in FIG. 1, the resin flow direction inspection device 1 uses an imaging camera 8 having an object-side telecentric system to rotate a rotating color filter unit 11, which functions as a color filter unit and is located within the imaging camera 8, to acquire multiple surface images of specularly reflected light from the surface S of a resin molded part 100 to which needle-like or fibrous filler has been added, and diffused light in a specific diffusion direction (filter arrangement direction), each colored with a different color. A resin flow direction image is then generated based on these multiple surface images. Details of the acquisition of the surface images and the generation of the resin flow direction image will be described later. The filler added to the resin molded part 100 may be spherical or planar, or may not be added at all.

[0019] The resin flow direction inspection device 1 has an input unit 2, a display unit 3, a memory unit 4, a control unit 5, a light source 6, a beam splitter 7, an imaging camera 8, a rotation drive unit 9, and an encoder 9a. The resin molded part 100 is, for example, an injection-molded resin molded part, to which needle-shaped or fibrous filler has been added as described above.

[0020] The input unit 2 is an input interface such as a mouse or keyboard. The display unit 3 is a display interface such as a liquid crystal display that displays various information. The storage unit 4 is a storage device such as a hard disk drive or non-volatile memory. The light source 6 is a white light source that emits parallel light perpendicular to the surface S via a beam splitter 7, and the light reflected from the surface S is input to the imaging camera 8 via the beam splitter 7. At this time, the specularly reflected light from the surface S is made parallel to the optical axis of the imaging camera 8. The imaging camera 8 is an imaging device that constitutes an image-side telecentric system that captures the reflected light from the surface S.

[0021] It is also possible to reflect and input specularly reflected light from the surface S so that it is parallel to the optical axis of the imaging camera 8, without using the beam splitter 7. In this case, collimated light from the light source 6 is made to be obliquely incident on the surface S, and the optical axis of the surface S or the imaging camera 8 is tilted.

[0022] The control unit 5 is a control unit that controls the entire resin flow direction inspection device 1, and has an image acquisition processing unit 5a, a correspondence unit 5b, a flow direction image generation unit 5c, and a display processing unit 5d. The control unit 5 stores programs corresponding to these functional units in a storage device such as a nonvolatile memory or a magnetic disk device, and loads these programs into memory and executes them on the CPU to execute the corresponding processes.

[0023] The image acquisition processing unit 5a operates the light source 6, the imaging camera 8, and the rotation drive unit 9 to acquire a surface image of the surface S of the resin molded part 100. The image acquisition processing unit 5a controls the rotation of the rotating color filter unit 11 in the imaging camera 8 via the rotation drive unit 9, and the imaging camera 8 sequentially acquires surface images as the rotating color filter unit 11 rotates.

[0024] The association unit 5b associates the surface image acquired by the imaging camera 8 with the rotation angle (filter arrangement direction) of the rotary color filter unit 11 accompanying the rotation of the rotary color filter unit 11. The rotation angle of the rotary color filter unit 11 is acquired by the encoder 9a.

[0025] The flow direction image generator 5c draws line segments, estimating the filter arrangement direction as the resin flow direction, in areas corresponding to image areas containing only the first color (red) component value for each surface image sequentially acquired as the rotary color filter unit 11 rotates, and generates an image as a resin flow direction image by combining the line segments drawn for each surface image. Here, the first color (red) is the color applied to specularly reflected light by the rotary color filter unit 11. The rotary color filter unit 11 also colors diffused light in the filter arrangement direction with a second color (blue).

[0026] The display processing unit 5d outputs the flow direction image generated by the flow direction image generating unit 5c to the display unit 3 for display.

[0027] <Configuration of the imaging camera and rotating color filter unit> 2 is a diagram showing the configuration of the imaging camera 8 and an example of the specularly reflected light L and the diffused light L1, L2.

[0028] 2, imaging camera 8 is provided with a large-diameter convex lens 10 on the surface S side, which has a large-diameter input area that can input all specularly reflected light from surface S parallel to optical axis C and forms an object-side telecentric optical system. Since large-diameter convex lens 10 has a large diameter, its thickness in the direction of optical axis C increases, so it is preferable to use a Fresnel lens.

[0029] A rotary color filter unit 11 is disposed at a focal point FC on the image side of the large-diameter convex lens 10. The rotary color filter unit 11 is disposed perpendicular to the optical axis C of the large-diameter convex lens 10 and is rotatable about the focal point FC. The rotary color filter unit 11 has a first color filter 12a that passes a first color (red) through an aperture hole 11a at a position where the optical axis C passes through, the first color filter 12a being centered on the optical axis C and allowing only specularly reflected light L parallel to the optical axis C on the object side to pass. The rotary color filter unit 11 also has a second color filter 12b that is disposed on the outer periphery of the aperture hole 11a in a filter arrangement direction A that passes through the focal point FC or the optical axis C, and extends linearly in both directions radially outward from the aperture hole 11a to pass a second color (blue) different from the first color (red), thereby allowing diffused light L1 and L2 to pass. The second color filter 12b forms two strip-shaped filters in the filter arrangement direction A, centered on the optical axis C. The rotating color filter unit 11 also has a light-shielding film 12c that shields the outer periphery of the second color filter 12b. The second color filter 12b extends linearly from the aperture hole 11a in the filter arrangement direction A, but may instead have a fan-shaped shape that expands radially, or may be partially formed without connecting to the aperture hole 11a or without continuing radially. The light-shielding film 12c only needs to shield at least a fan-shaped portion that extends 90 degrees in the circumferential direction around a line that is perpendicular to the filter arrangement direction A and passes through the optical axis C. For example, it only needs to shield at least a fan-shaped portion that extends 90 degrees in both the ±X directions in FIG. 3 .

[0030] The rotary color filter unit 11 is driven to rotate by the rotary drive unit 9. For example, as shown in FIG. 3, it rotates in a clockwise direction RA, rotating at least 180°. The rotation angle of the rotary color filter unit 11 is detected by the encoder 9a. Acquisition of surface images as the rotary color filter unit 11 rotates is performed at predetermined rotation angles, for example, 10°, 20°, and 45°. If the predetermined rotation angle is 45°, 0° and 180° represent the same filter arrangement direction A, so four surface images are sufficient. Surface images may be acquired at each predetermined rotation angle from a moving image. The rotary drive unit 9 may rotate the resin molded part 100 around the optical axis C, instead of the rotary color filter unit 11. In this case, the rotary color filter unit 11 does not rotate. Alternatively, both the rotary color filter unit 11 and the resin molded part 100 may be rotated. That is, it is sufficient that the rotary color filter unit 11 and the resin molded part 100 rotate relative to each other.

[0031] Aperture convex lens 13 forms an image of the light that has passed through rotary color filter unit 11 on image sensor 14. Image sensor 14 may have an array of pixels that can receive at least a first color and a second color.

[0032] 2, the diffused light L1 and L2 from position P1 passes through second color filter 12b and forms an image at position P2 on image sensor 14. Of the diffused light from position P1, the light that strikes light-shielding film 12c is blocked by light-shielding film 12c and does not reach image sensor 14.

[0033] <Generation of resin flow direction images> Here, an example of the process for generating a resin flow direction image will be described. Fig. 4 is a diagram showing an imaging area E of the surface S that is imaged by the imaging camera 8. Fig. 4 shows a resin flow AR that is invisible to the naked eye. Fig. 5 is a diagram showing an example of a plurality of surface images D1 to D3 of the imaging area E of the surface S that are imaged while the rotary color filter unit 11 is rotated, partial flow direction images D11 to D13 generated based on the surface images D1 to D3, and a flow direction image D20 obtained by combining the partial flow direction images D11 to D13. Fig. 5 shows surface images D1 to D3 at rotation angles of 0°, 45°, and 135°.

[0034] The surface image D1 shown in FIG. 5(a) is an image obtained when the filter arrangement direction A is 0°. The entire surface of the surface image D1 is colored with red specularly reflected light L that passed through the first color filter 12a. Furthermore, the surface image D1 is colored blue as light diffused in the filter arrangement direction A passes through the second color filter 12b. The second color filter 12b primarily transmits light diffused in the filter arrangement direction A, but also transmits a small amount of light diffused inclined relative to the filter arrangement direction A. The amount of transmitted diffused light decreases depending on the angle with respect to the filter arrangement direction A. The image regions E11 and E12, which are colored only red, can be said to have no diffused light in the filter arrangement direction A. Because the resin molded part 100 contains filler, diffused light occurs everywhere. Conversely, the image regions E11 and E12, which are colored only red, can be said to have only diffused light perpendicular to the filter arrangement direction A.

[0035] In fact, in the experiment, only diffused light perpendicular to the filter arrangement direction A was present in the image regions E11 and E12 colored only red. Diffused light diffuses in a direction perpendicular to the longitudinal direction of the needle-like or fibrous filler added to the resin. Therefore, it is estimated that the resin flows in the image regions E11 and E12 colored only red in the same direction as the filter arrangement direction A. For this reason, the flow direction image generating unit 5c generates a partial flow direction image D11 in which line segments oriented in the filter arrangement direction A are drawn in the areas corresponding to the image regions E11 and E12 colored only red. The direction of the line segments in this partial flow direction image D11 and the areas in which the line segments are drawn match the actual resin flow direction shown in FIG. 4.

[0036] 5(b), a partial flow direction image D12 is obtained. The flow direction image generating unit 5c generates a partial flow direction image D12 by drawing line segments facing the filter arrangement direction A in an area corresponding to image area E21, which is colored only red in the surface image D2, assuming that the resin flows in the same direction as the filter arrangement direction A. The line segments in the partial flow direction image D12 are oriented in the filter arrangement direction A at a rotation angle of 45°.

[0037] 5(c), a partial flow direction image D13 is obtained. The flow direction image generating unit 5c generates a partial flow direction image D13 by drawing line segments facing the filter arrangement direction A in an area corresponding to image area E31, which is colored only red in the surface image D3, assuming that the resin flows in the same direction as the filter arrangement direction A. The line segments in the partial flow direction image D13 are facing the filter arrangement direction A at a rotation angle of 135°.

[0038] Thereafter, the flow direction image generation unit 5c generates a flow direction image D20 by combining the partial flow direction images D11 to D13. The display processing unit 5d outputs and displays the generated flow direction image D20 on the display unit 3. The planar flow of the generated flow direction image D20 matches the planar flow AR shown in Fig. 4, making it possible to easily and quickly inspect the planar flow of resin in the resin molded part 100.

[0039] Note that since the flow direction image D20 shown in Fig. 5 is a discontinuous flow made up of a combination of line segments, each line segment may be subjected to curved line interpolation to create a flow direction image D30, as shown in Fig. 6. Curved line interpolation can be easily performed using a Bezier curve or a spline curve.

[0040] <Flow direction image generation process> 7 is a flowchart showing the flow direction image generation processing procedure performed by the control unit 5. As shown in FIG. 7, the control unit 5 first sets the rotation angle of the filter arrangement direction A to an initial value (0°) (step S110). Thereafter, the image capturing camera 8 acquires a surface image (step S120). Then, a partial flow direction image is generated in an area corresponding to an image area containing only the color component values ​​of the first color (red) by drawing a line segment with the filter arrangement direction A as the resin flow direction (step S130).

[0041] Thereafter, it is determined whether the rotation angle is 180° (step S140). If the rotation angle is not 180° (step S150: No), the rotating color filter unit 11 is driven to the next rotation angle (step S150), and the process proceeds to step S120. On the other hand, if the rotation angle is 180° (step S140: Yes), a flow direction image is generated by combining the partial flow direction images, and is displayed (step S160), and the process ends.

[0042] <Modification> Fig. 8 is an explanatory diagram illustrating generation of a partial flow direction image according to a modified example. Fig. 8 shows a partial flow direction image D12' obtained by a modified example for the surface image D2 with a rotation angle of 45° shown in Fig. 5. In the above embodiment, a line segment indicating the flow direction was drawn in an area corresponding to the image region E21 colored only in the first color (red). However, in this modified example, a partial flow direction image D12' is generated in which a line segment, the flow direction of which is perpendicular to the filter arrangement direction A, is drawn in an area corresponding to an image region E23 in the surface image D2 that is colored in the first color and also in the second color (blue) and whose blue color component value is equal to or greater than a predetermined value.

[0043] The partial flow direction image obtained by this modification is different from that of the embodiment, but the flow direction image obtained by combining the partial flow direction images is the same as that of the embodiment.

[0044] In the above-described embodiment and modified example, the image regions of the surface image containing only the first color and the image regions containing both the first and second colors are horizontally strip-shaped. However, as shown in FIG. 9, image regions E41 and E42 of arbitrary shapes on the surface image may be acquired as image regions containing only the first color, forming the surface image D4. In this case, a partial flow direction image D14 may be generated by drawing line segments in the filter arrangement direction A in regions E41' and E42' corresponding to the image regions E41 and E42. The same applies to the modified example. In this case, a partial flow direction image may be generated by drawing line segments perpendicular to the filter arrangement direction A in regions corresponding to the regions containing the first and second colors, where the color component value of the second color is equal to or greater than a predetermined value. While the image regions E41 and E42 of the surface image D4 shown in FIG. 9 are rectangular, they may have any shape, including circular and elliptical shapes, depending on the flow distribution of the resin flow AR.

[0045] Furthermore, although the above surface image is of a single resin molded part, it may be a surface image of a combination of multiple resin molded parts. In other words, the surface images of multiple resin molded parts may be acquired as a single surface image.

[0046] Note that the configurations illustrated in the above embodiments and modifications are merely functional schematics and do not necessarily have to be physically configured as shown. In other words, the distribution and integration of each device is not limited to that illustrated, and all or part of them can be functionally or physically distributed and integrated in any unit depending on various loads, usage conditions, etc. [Industrial Applicability]

[0047] The resin flow direction inspection device and resin flow direction inspection method of the present invention are useful when it is desired to inspect the resin flow direction of a resin molded part on a planar basis and easily visualize the resin flow direction. [Explanation of symbols]

[0048] 1. Resin flow direction inspection device 2 Input section 3 Display section 4 Storage section 5. Control section 5a Image acquisition processing section 5b Mapping section 5c Flow direction image generation unit 5d Display processing section 6 light source 7 Beam Splitter 8 Imaging camera 9 Rotation drive unit 9a Encoder 10 Large diameter convex lens 11 Rotating color filter unit 11a aperture hole 12a First color filter 12b Second color filter 12c light shielding film 13 Aperture convex lens 14 Image sensor 100 Resin molded parts A Filter placement direction C optical axis D1~D4 Surface images D11~D14,D12´ Partial flow direction images D20, D30 flow direction images E Imaging area E11,E12,E21,E22,E23,E31,E41,E42 Image area E41´,E42´ area P1,P2 position S surface

Claims

1. A resin flow direction inspection device that inspects the resin flow direction in one or more resin molded parts, a large-diameter convex lens that forms an object-side telecentric optical system; a first color filter that passes a first color through an aperture hole that passes only specularly reflected light parallel to the optical axis on the object side and is centered on the optical axis, and a second color filter that passes a second color different from the first color and is disposed on the outer periphery of the aperture hole in a filter arrangement direction that passes through an image-side focal position of the large-diameter convex lens, the second color filter being disposed in the same direction but opposite directions radially outward from the aperture hole and passing diffused light; a color filter section that is orthogonal to the filter arrangement direction and forms a sector-shaped portion of the outer periphery that is at least 90 degrees in the circumferential direction around a straight line that passes through the optical axis, except for the second color filter, and is disposed perpendicular to the optical axis at the image-side focal position of the large-diameter convex lens; a rotation drive unit that rotates the color filter unit and / or the resin molded component relatively around the optical axis by at least 180 degrees; an imaging unit that sequentially acquires surface images of the resin molded part as the color filter unit rotates; a correlation unit that correlates the surface image acquired by the imaging unit with the rotation angle of the filter arrangement direction; a flow direction image generating unit that draws line segments estimated by setting the filter arrangement direction as the flow direction in an area corresponding to an image area containing only the color component values ​​of the first color for each surface image sequentially acquired in accordance with the rotation, and generates an image obtained by combining the line segments drawn for each surface image as a resin flow direction image; A resin flow direction inspection device comprising:

2. A resin flow direction inspection device that inspects the resin flow direction in one or more resin molded parts, a large-diameter convex lens that forms an object-side telecentric optical system; a first color filter that passes a first color through an aperture hole that passes only specularly reflected light parallel to the optical axis on the object side and is centered on the optical axis, and a second color filter that passes a second color different from the first color and is disposed on the outer periphery of the aperture hole in a filter arrangement direction that passes through an image-side focal position of the large-diameter convex lens, the second color filter being disposed in the same direction but opposite directions radially outward from the aperture hole and passing diffused light; a color filter section that is orthogonal to the filter arrangement direction and forms a sector-shaped portion of the outer periphery that is at least 90 degrees in the circumferential direction around a straight line that passes through the optical axis, except for the second color filter, and is disposed perpendicular to the optical axis at the image-side focal position of the large-diameter convex lens; a rotation drive unit that rotates the color filter unit and / or the resin molded component relatively around the optical axis by at least 180 degrees; an imaging unit that sequentially acquires surface images of the resin molded part as the color filter unit rotates; a correlation unit that correlates the surface image acquired by the imaging unit with the rotation angle of the filter arrangement direction; a flow direction image generating unit that draws line segments, the direction of flow being perpendicular to the filter arrangement direction, in an area corresponding to an image area where a second color component value that is a color component value of the second color is equal to or greater than a predetermined value for each surface image that is sequentially acquired in accordance with the rotation, and generates an image that combines the line segments drawn for each surface image as a resin flow direction image; A resin flow direction inspection device comprising:

3. 3. The resin flow direction inspection device according to claim 1, wherein the flow direction image is obtained by curve interpolation of each line segment.

4. 4. The resin flow direction inspection device according to claim 1, wherein the resin molded part contains needle-shaped or fibrous filler.

5. 5. The resin flow direction inspection device according to claim 1, wherein the surface image is a surface image of two or more combined resin molded parts.

6. A resin flow direction inspection method for inspecting a resin flow direction in one or more resin molded parts, comprising: a first color filter that passes a first color through an aperture hole that passes only specularly reflected light that is parallel to the optical axis on the object side and is centered on the optical axis, and a second color filter that passes a second color different from the first color is formed on the outer periphery of the aperture hole, the second color filter being arranged in a filter arrangement direction that passes through an image-side focal position of the large-diameter convex lens and in the same direction but opposite directions toward the outside in the radial direction with respect to the aperture hole, the second color filter allowing diffused light to pass through, and a sector-shaped portion of the outer periphery that is orthogonal to the filter arrangement direction and that extends at least 90 degrees in the circumferential direction around a straight line that passes through the optical axis, other than the second color filter, that is light-shielded, and a color filter portion that is arranged perpendicular to the optical axis at the image-side focal position of the large-diameter convex lens is provided; an imaging step of rotating the color filter unit and / or the resin molded component relatively by at least 180 degrees around the optical axis, sequentially acquiring surface images of the resin molded component as the component rotates, and associating the acquired surface images with the rotation angle of the filter arrangement direction; a flow direction image generating step of drawing line segments, estimated as the filter arrangement direction as the flow direction, in an area corresponding to an image area containing only the color component values ​​of the first color for each surface image sequentially acquired in accordance with the rotation, and generating an image obtained by combining the line segments drawn for each surface image as a resin flow direction image; A resin flow direction inspection method comprising:

7. A resin flow direction inspection method for inspecting a resin flow direction in one or more resin molded parts, comprising: a first color filter that passes a first color through an aperture hole that passes only specularly reflected light that is parallel to the optical axis on the object side and is centered on the optical axis, and a second color filter that passes a second color different from the first color is formed on the outer periphery of the aperture hole, the second color filter being arranged in a filter arrangement direction that passes through an image-side focal position of the large-diameter convex lens and in the same direction but opposite directions toward the outside in the radial direction with respect to the aperture hole, the second color filter allowing diffused light to pass through, and a sector-shaped portion of the outer periphery that is orthogonal to the filter arrangement direction and that extends at least 90 degrees in the circumferential direction around a straight line passing through the optical axis, other than the second color filter, that is light-shielded, and a color filter portion that is arranged perpendicular to the optical axis at the image-side focal position of the large-diameter convex lens is provided; an imaging step of rotating the color filter unit and / or the resin molded component relatively by at least 180 degrees around the optical axis, sequentially acquiring surface images of the resin molded component as the component rotates, and associating the acquired surface images with the rotation angle of the filter arrangement direction; a flow direction image generating step of drawing line segments, the direction perpendicular to the filter arrangement direction being the flow direction, in an area corresponding to an image area where a second color component value that is a color component value of the second color is equal to or greater than a predetermined value for each surface image sequentially acquired with the rotation, and generating an image as a resin flow direction image by combining the line segments drawn for each surface image; A resin flow direction inspection method comprising:

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