Image inspection device and image inspection method

Abstract

To provide an image inspection device and an image inspection method capable of clearly capturing an image of the appearance of a workpiece.SOLUTION: An image inspection device 1 comprises: a mirror rotating body 12; an imaging section 13; a plurality of illumination sections that is provided to the mirror rotating body 12 and generates subject light by irradiating a workpiece with illumination light from a plurality of directions around an axis X11; an illumination setting section 152 that sets illumination intensity of each of the plurality of illumination sections individually; a drive section 14 that drives the mirror rotating body 12 rotationally around the axis X11; and an imaging-processing section 151 that causes the drive section 14 to drive the mirror rotating body 12 rotationally, and causes the imaging section 13 to capture an image of the workpiece when the mirror rotating body 12 is positioned at a preset setting angle.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an image inspection device and an image inspection method for photographing a workpiece and performing inspection using the photographed image. [Background technology]

[0002] Conventionally, an image inspection device and an image inspection method for photographing and inspecting a workpiece are known (see, for example, Patent Document 1). In the image inspection device and image inspection method described in Patent Document 1, a ring-shaped illumination unit is provided that surrounds the workpiece, and the appearance of the workpiece is photographed under that illumination. In the technology described in Patent Document 1, the workpiece is photographed as a single image around the central axis of a mirror over its entire circumference.

[0003] In response to this, there is a demand for inspecting the appearance of a workpiece individually from one or more directions, and so technologies that enable photographing of the workpiece from any direction have been considered. One example of such a technology is a technique in which a mirror rotating body that can rotate around the workpiece guides subject light to an imaging unit, thereby photographing the workpiece from a direction according to the position of the mirror rotating body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-240728 Summary of the Invention [Problem to be solved by the invention]

[0005] When photographing using the above-described mirror rotating body under illumination by a ring-shaped illumination unit as described in Patent Document 1, the illumination intensity from some directions may be insufficient due to interference with the mirrors in the mirror rotating body, resulting in a dark image. On the other hand, if the illumination intensity of the ring-shaped illumination unit is increased to compensate for this lack of illumination intensity, the illumination from other directions may be too bright, resulting in overexposed highlights. Such dark or overexposed images make the appearance of the workpiece in the image unclear, making them undesirable for visual inspection.

[0006] Therefore, the present invention focuses on the above-mentioned problems and aims to provide an image inspection device and an image inspection method that can clearly capture the appearance of a workpiece. [Means for solving the problem]

[0007] In order to solve the above problem, the image inspection device is characterized by comprising: a mirror rotor having one or more mirrors rotatable around a predetermined axis, which reflects subject light from a workpiece arranged on the axis and guides it to a shooting position; a shooting unit installed at the shooting position and receives the subject light to photograph the workpiece; a plurality of lighting units installed on the mirror rotor so as to rotate together with the mirror rotor around the axis, which generate the subject light by irradiating the workpiece with illumination light from multiple directions around the axis; an illumination setting unit which individually sets the lighting intensity of each of the plurality of lighting units; a drive unit which drives the mirror rotor to rotate around the axis; and a shooting processing unit which drives the mirror rotor to rotate with the drive unit and causes the shooting unit to photograph the workpiece when the mirror rotor is positioned at a predetermined setting angle.

[0008] In addition, in order to solve the above problem, the image inspection method is characterized by comprising a work placement process for placing the work on the axis of the above-mentioned image inspection device, an illumination setting process for individually setting the illumination intensity of each of the multiple illumination units, and an imaging processing process for rotating the mirror rotor with the drive unit and causing the imaging unit to photograph the work when the mirror rotor is positioned at a predetermined setting angle. [Effects of the Invention]

[0009] According to the image inspection device and image inspection method described above, the appearance of the workpiece can be clearly photographed. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing an image inspection device according to an embodiment; [Figure 2] FIG. 2 is a perspective view of the mirror rotating body shown in FIG. 1 as seen from the workpiece side. [Figure 3] 3 is a plan view showing the state of the mirror rotating body shown in FIG. 2 rotated around an axis line serving as the center of rotation, as viewed from the direction of arrow V11 in FIG. 2. FIG. [Figure 4] 3 is a cross-sectional view taken along line V12-V12 in FIG. 2, illustrating how subject light from a workpiece is guided toward an imaging unit in the mirror rotating body shown in FIG. 2. FIG. [Figure 5] FIG. 2 is a schematic diagram showing an image obtained by photographing in a full lighting mode performed by the image inspection device shown in FIG. 1 and an image obtained by silhouette photographing in a back lighting mode, side by side. [Figure 6] 2 is a schematic flowchart showing the flow of processing of an image inspection method performed in the image inspection device shown in FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of an image inspection device and an image inspection method will be described below.

[0012] FIG. 1 is a perspective view showing an image inspection device according to one embodiment.

[0013] The image inspection device 1 of this embodiment is a device that takes an electric wire with terminals W1 shown in Fig. 2 and subsequent figures as a workpiece to be inspected, photographs the electric wire from multiple angles around the wire, and performs an appearance inspection based on the photographed images. This image inspection device 1 first includes an apparatus frame 11, a mirror rotating body 12, an imaging unit 13, a driving unit 14, and a processing unit 15.

[0014] The device frame 11 is a frame portion that supports the mirror rotor 12, the photographing unit 13, and the drive unit 14, and includes a base portion 111, a mirror rotation holder 112, and a photographing holder 113. The base portion 111 is a rectangular flat plate, and the mirror rotation holder 112 and the photographing holder 113 are installed on the upper surface of the base portion 111 in the longitudinal direction D11, in that order from the workpiece side. The mirror rotation holder 112 is a rectangular flat plate that is erected on the upper surface of the base portion 111 with its long side extending in the erecting direction D12, and the mirror rotor 12 and the motor 141 of the drive unit 14 are held on the workpiece side of the front and back surfaces of the mirror rotation holder 112. Furthermore, a rotation transmission mechanism 142 of the drive unit 14 is held on the opposite surface of the mirror rotation holder 112. The imaging holding part 113 is a part that holds the imaging part 13 at an imaging position P11, which is on the opposite side of the mirror rotor 12 across the mirror rotation holding part 112. The imaging holding part 113 includes a rectangular flat plate part 113a that is fixed to the base part 111 along its longitudinal direction D11, and a pair of holding legs 113b that are erected at both ends of the plate part 113a and that hold the imaging part 13.

[0015] The mirror rotor 12 has one or more mirrors rotatably mounted around a predetermined axis X11 along the longitudinal direction D11 of the base portion 111, and is a component that reflects subject light from a workpiece placed on the axis X11 and guides it to a photographing position P11. As described above, the mirror rotor 12 is rotatably held on the workpiece-side surface of the mirror rotation holder 112. This mirror rotor 12 will be described in detail later with reference to a separate drawing.

[0016] The photographing unit 13 is installed at the photographing position P11, and is a part that receives subject light from the workpiece and photographs the workpiece, and is equipped with a camera 131 and a photographing lens 132. The camera 131 is held by the holding leg 113b on the side of the photographing holding unit 113 that is farther from the mirror rotation holding unit 112, and is the part that photographs. The photographing lens 132 has a roughly cylindrical appearance, and one end side is held by the camera 131, and the middle part is held by the holding leg 113b on the mirror rotation holding unit 112 side of the photographing holding unit 113. This photographing lens 132 is a part that collects subject light from the mirror rotor 12 and sends it to the camera 131.

[0017] The drive unit 14 is a component that drives the mirror rotor 12 to rotate around the axis X11, which serves as the center of rotation, and includes a motor 141 and a rotation transmission mechanism 142. The motor 141 is a servo motor whose rotation can be controlled and is held above the mirror rotor 12 on the workpiece side of the mirror rotation holder 112. The rotation transmission mechanism 142 includes a small pulley 142a, a large pulley 142b, and a transmission belt 142c. The small pulley 142a is a pulley component that passes through the mirror rotation holder 112 and is connected to the rotation shaft of the motor 141. The large pulley 142b is a pulley component that is rotatable around the axis X11 of the mirror rotor 12, passes through the mirror rotation holder 112 and is connected to the mirror rotor 12, and has a larger diameter than the small pulley 142a. The transmission belt 142c is a belt component that connects the small pulley 142a and the large pulley 142b and transmits the rotation of the small pulley 142a to the large pulley 142b.

[0018] The processing unit 15 is a control part that is connected to the photographing unit 13, the driving unit 14, and the lighting unit 16 (described later) provided on the mirror rotating body 12 to control their operation, and also performs various processes based on the image photographed by the driving unit 14. The processing unit 15 includes a photographing processing unit 151 and a lighting setting unit 152. The photographing processing unit 151 and the lighting setting unit 152 will be described in detail later with reference to separate drawings.

[0019] Next, the mirror rotor 12 will be described in detail.

[0020] FIG. 2 is a perspective view of the mirror rotor shown in FIG. 1 as seen from the workpiece side, and FIG. 3 is a plan view showing the mirror rotor shown in FIG. 2 as it rotates around an axis serving as the center of rotation, as viewed from the direction of arrow V11 in FIG. 2. FIG. 4 is a cross-sectional view taken along line V12-V12 in FIG. 2, showing how subject light from the workpiece is guided toward the imaging unit in the mirror rotor shown in FIG. 2. Note that FIG. 3 shows the circular connecting plate 142b-1 of the large pulley 142b, which is not shown in FIG. 2, behind the mirror rotor 12. FIG. 4 also shows the mirror rotation holder 112, the large pulley 142b including the circular connecting plate 142b-1, and a portion of the imaging lens 132 in the imaging unit 13, all of which are shown in FIG. 1, together with the mirror rotor 12.

[0021] First, the terminal-equipped electric wire W1 as the work in this embodiment is formed by crimping and connecting female connector terminals W13 to the ends of two electric wires W12 that are exposed in an untwisted state at the end of a twisted pair electric wire W11. The mirror rotating body 12 is provided with a rectangular work arrangement space 12a that surrounds an axis X11 that serves as the center of rotation of the mirror rotating body 12. The terminal-equipped electric wire W1 is arranged on the axis X11 with its electric wire axis aligned along the axis X11 so that the electric wire ends to which the connector terminals W13 are crimped and connected fit within the work arrangement space 12a.

[0022] The mirror rotor 12 is provided with four illumination units 16 that irradiate illumination light L11 from each of four inner surfaces surrounding the axis X11 in the workpiece placement space 12a. These four illumination units 16 are provided on the mirror rotor 12 so as to rotate together with the mirror rotor 12 about the axis X11, and irradiate the terminal-attached electric wire W1 (the workpiece) with illumination light L11 from multiple directions (four directions in this embodiment) about the axis X11. These four illumination units 16 are arranged at 90° intervals about the axis X11 and comprise a front illumination unit 161, a pair of side illumination units 162, and a back illumination unit 163. The front illumination unit 161 is arranged on the front side of the image capture, with the side on which a half mirror 122a (described later) is arranged as viewed from the terminal-attached electric wire W1 being the front side. Of the illumination light L11 from the four directions, front illumination light L111 is irradiated by transmitting through the half mirror 122a. The pair of side illumination units 162 are arranged at a pair of left and right positions spaced ±90° around the axis X11 from the front illumination unit 161, and each side emits side illumination light L112 of the illumination light L11 in four directions. The back illumination unit 163 is arranged on the imaging back side, with the side opposite to the side on which the half mirror 122a is arranged as viewed from the terminal-attached electric wire W1 being the imaging back side, and emits back illumination light L113 of the illumination light L11 in four directions from this imaging back side. The four illumination units 16 are connected to the processing unit 15 via an illumination cable 16a (FIG. 1).

[0023] Hereinafter, mainly with reference to FIG. 4, a mirror configuration will be described in which the mirror rotor 12 reflects the front illumination light L111 by the terminal-attached electric wire W1 as the workpiece, and guides the reflected light L12 to the shooting side as subject light.

[0024] The mirror rotor 12 is provided with a plurality of mirrors rotatable about the axis X11, including one half-mirror prism 122 and a pair of mirror prisms 123. The half-mirror prism 122 is a rectangular block-shaped prism component arranged between the front illumination unit 161 and the work placement space 12a so that one of its outer surfaces is the inner surface of the work placement space 12a. A half-mirror 122a is formed on an inner diagonal surface of the half-mirror prism 122. The half-mirror 122a is arranged facing the terminal-attached electric wire W1 and serves as a facing mirror that reflects subject light. The half-mirror 122a transmits the front illumination light L111 into the work placement space 12a and reflects the reflected light L12 reflected by the terminal-attached electric wire W1 toward the shooting side as subject light.

[0025] Reflected light L12 as subject light reflected by half mirror 122a of half mirror prism 122 is reflected toward axis X11 by mirror 123a in one mirror prism 123. It is further reflected toward the shooting side along axis X11 by mirror 123a in the other mirror prism 123. Reflected light L12 reflected by the last mirror 123a passes through through hole 142b-2 in large pulley 142b including circular connecting plate 142b-1, enters shooting lens 132 of shooting unit 13, and is condensed toward camera 131.

[0026] The driving unit 14 shown in Fig. 1 drives the mirror rotor 12 described above to rotate around an axis X11 on which the terminal-attached electric wire W1 as the work is arranged, in a clockwise rotation direction D13 as viewed from the work side as shown in Fig. 3. At this time, the driving unit 14 sends a signal indicating the motor rotation angle of the motor 141 to the processing unit 15. An imaging processing unit 151 in the processing unit 15 causes the driving unit 14 to drive the mirror rotor 12 to rotate, and also causes the imaging unit 13 to capture an image of the terminal-attached electric wire W1 when the mirror rotor 12 is positioned at a preset angle.

[0027] In this embodiment, the illumination setting unit 152 in the processing unit 15 individually sets the illumination intensity of each of the four illumination units 16. First, the illumination setting unit 152 sets the illumination intensity of the front illumination unit 161 among the four illumination units 16 to be stronger than the illumination intensity of the other illumination units. The illumination intensity of the front illumination light L111 from the front illumination unit 161 is attenuated to 1 / 2 when passing through the half mirror 122a. Furthermore, the illumination intensity of the reflected light L12, which is the front illumination light L111 reflected by the terminal-equipped electric wire W1, is also attenuated to 1 / 2 when passing through the half mirror 122a. In other words, the illumination intensity of the front illumination light L111 from the front illumination unit 161 is attenuated to 1 / 4 by the time it reaches the imaging unit 13, including the attenuation of the reflected light L12. To compensate for this attenuation of the front illumination light L111, the illumination setting unit 152 sets the illumination intensity of the front illumination unit 161 to be approximately four times stronger than the illumination intensity of the other illumination units.

[0028] Furthermore, the illumination setting unit 152 sets the illumination intensity of the backlight unit 163 of the four illumination units 16 to be weaker than the illumination intensity of the other illumination units. This is to prevent backlight shooting from occurring due to the backlight illumination light L113 from the backlight unit 163 being too strong. Furthermore, the illumination setting unit 152 sets the illumination intensity of the pair of side illumination units 162 to be approximately intermediate between the illumination intensity of the front illumination unit 161 and the illumination intensity of the backlight unit 163.

[0029] Basically, photographing at a plurality of set angles performed by rotating the mirror rotator 12 is performed under the illumination of the four illuminators 16 whose illumination intensities have been set by the illumination setting unit 152 as described above. In this embodiment, the illumination setting unit 152 not only individually sets the illumination intensities of the four illuminators 16, but also performs illumination switching control to switch between an all-on mode and a backlighting mode as described below. The all-on mode is a mode in which all four illuminators 16 whose illumination intensities have been set as described above are turned on, and normal photographing is performed in this all-on mode. In contrast, the backlighting mode is a mode in which only the backlighting unit is turned on, and is set in response to a user's designated operation when performing silhouette photographing as described below.

[0030] Figure 5 is a schematic diagram showing, side by side, an image captured in full illumination mode and an image captured in silhouette illumination mode in the image inspection device shown in Figure 1. Figure 5(A) shows a first image G11 captured in full illumination mode, and Figure 5(B) shows a second image G12 captured in back illumination mode.

[0031] In the example of Fig. 5, the workpiece is a twisted shielded pair electric wire W2 instead of the above-described electric wire with terminal W1. At one end of this twisted shielded pair electric wire W2, two electric wires W21 serving as core wires are exposed in an untwisted state. In addition, the braided shield W22 covering the two electric wires W21 is exposed in a state where it is folded back to the outside of the outermost coating portion W23 at the base side of the exposed electric wires W21. Furthermore, in the example of Fig. 5, fine wire portions W24 are frayed and protrude from the folded back portion of the braided shield W22.

[0032] The first captured image G11 in full illumination mode shown in Figure 5(A) is an image in which the surface shape of the twisted shielded pair electric wire W2 as the workpiece is illuminated in detail. Photographing in full illumination mode is performed for basic appearance inspections, etc. However, in this first captured image G11, the fine wire portion W24 is likely to be lost in the illumination light L11 from four directions and become overexposed during photographing. Note that Figure 5(A) illustrates the wire portion W24, which is likely to be lost in the first captured image G11 due to overexposure, for illustrative purposes.

[0033] 5(B), the second image G12 captured in the back-lit mode is a silhouette image of the twisted shielded pair electric wire W2 illuminated only by the backlight L113. In this silhouette image, the fine outline of the twisted shielded pair electric wire W2 stands out, and the minute bare wire portion W24 also appears as a black line. Photographing in the back-lit mode is performed for the purpose of inspecting for the presence or absence of minute objects such as the bare wire portion W24.

[0034] The image inspection device 1 shown in Figure 1 inspects workpieces such as terminal-attached electric wires W1 and twisted shielded pair electric wires W2 using the following image inspection method, which includes the lighting switching control between the full lighting mode and back lighting mode described above.

[0035] FIG. 6 is a schematic flowchart showing the flow of processing of the image inspection method performed in the image inspection device shown in FIG.

[0036] 6, first, a workpiece placement step (S11) is performed in which a workpiece is placed on an axis X11 inside the workpiece placement space 12a in the image inspection device 1. Next, a mode determination step (S12) is performed in the illumination setting unit 152 of the processing unit 15 in which it is determined whether the designated lighting mode is the full lighting mode. If the determination is YES, the illumination setting unit 152 performs a full lighting setting step (S13) in which the illumination intensity of each of the four illumination units 16 is individually set as described above. Thereafter, the illumination setting unit 152 performs a full lighting step (S14) in which all four illumination units 16 are turned on at the set lighting intensity. On the other hand, if the determination result in the mode determination step (S12) is NO, the illumination setting unit 152 performs a backlight setting step (S15) in which it sets only the illumination intensity of the backlight unit 163 to a predetermined intensity. Thereafter, the illumination setting unit 152 performs a backlighting step (S16) in which it turns on only the backlight unit 163 at the set illumination intensity.

[0037] When lighting is performed in the full lighting step (S14) or the back lighting step (S16), the photographing processing unit 151 performs a photographing processing step (S17). The photographing processing step (S17) is a step of causing the drive unit 14 to rotate the mirror rotator 12, and causing the photographing unit 13 to photograph the workpiece when the mirror rotator 12 is positioned at a preset angle. After this photographing processing step (S17), the processing unit 15 performs an inspection processing step (S18) such as an appearance inspection based on the acquired photographed image and checking for the presence or absence of the above-mentioned minute objects.

[0038] The image inspection device 1 and image inspection method of the embodiment described above can provide the following effects. That is, according to this embodiment, the illumination intensity of each of the four illumination units 16 is set individually by the illumination setting unit 152. This individual setting makes it possible to appropriately set the illumination intensity in each direction relative to the workpiece, thereby suppressing overexposure due to insufficient illumination intensity or excessive illumination intensity in the captured image. Furthermore, because these suppression effects are obtained, this embodiment makes it possible to clearly capture the appearance of the workpiece.

[0039] In this embodiment, the illumination setting unit 152 sets the illumination intensity of the front illumination unit 161, which irradiates front illumination light L111 by transmitting it through the half mirror 122a of the mirror rotator 12, to be stronger than the illumination intensity of the other illumination units 16. With this configuration, firstly, the half mirror 122a and the front illumination units 161 are compactly arranged in the irradiation direction of the front illumination light L111, so that the structure of the multiple illumination units 16 and the mirror rotator 12 can be made compact. Furthermore, the illumination setting unit 152 compensates for the decrease in intensity due to passage through the half mirror 122a by setting the illumination intensity of the front illumination unit 161 to be stronger, so that it is possible to effectively achieve both compactness and ensuring sufficient illumination intensity on the front side of the image.

[0040] Furthermore, in this embodiment, the illumination setting unit 152 sets the illumination intensity of the backlight unit 163 to be weaker than the illumination intensity of the other illumination units 16. This configuration effectively prevents situations such as backlighting photography due to the backlight illumination light L113 irradiated from the back side of photography being too bright.

[0041] In this embodiment, the illumination setting unit 152 performs illumination switching control to switch between a full illumination mode in which all four illumination units 16 are illuminated, and a backlighting mode in which only the backlighting unit 163 is illuminated. With this configuration, the full illumination mode can be used to illuminate and photograph the surface shape and other details of the workpiece, and the backlighting mode can be used to photograph a silhouette that highlights the fine contours of the workpiece.

[0042] In this embodiment, the four illumination units 16 are arranged at 90° intervals around the axis X11. With this configuration, the workpiece can be illuminated with illumination light of appropriate illumination intensity according to each direction at 90° intervals around the axis X11, allowing the appearance of the workpiece to be photographed more clearly.

[0043] The above-described embodiments merely show typical forms of the image inspection device and image inspection method. The image inspection device and image inspection method are not limited to these, and can be implemented in various modifications.

[0044] For example, in the above-described embodiment, as an example of an image inspection device and an image inspection method, an image inspection device 1 and an image inspection method are exemplified in which an electric wire with terminal W1 or a twisted shielded pair electric wire W12 is photographed as a work and various inspections are performed. However, the image inspection device and the image inspection method are not limited to these, and may be one in which an electric wire other than these or any member other than an electric wire is photographed and inspected as a work.

[0045] Furthermore, in the above-described embodiment, as an example of an image inspection device and an image inspection method, an image inspection device 1 and an image inspection method are exemplified in which, while rotating the mirror rotor 12, an image is captured based on the subject light from the rotating mirror rotor 12. However, the image inspection device and the image inspection method are not limited to this, and may also capture images by stopping the mirror rotor at a set angle.

[0046] Furthermore, in the above-described embodiment, as an example of an image inspection device and an image inspection method, an image inspection device 1 and an image inspection method are exemplified in which the illumination setting unit 152 sets the illumination intensity of the front illumination unit 161, which irradiates the front illumination light L111 through the half mirror 122a, to a high level. However, the image inspection device is not limited to this, and for example, the front illumination unit may be arranged so as not to overlap with the half mirror, and its illumination intensity may be set to the same level as the other illumination units. However, as described above, by arranging the front illumination unit 161 so as to face the half mirror 122a and setting its illumination intensity to a high level, it is possible to effectively achieve both downsizing of the device and ensuring sufficient illumination intensity on the front side of the image being photographed.

[0047] Furthermore, in the above-described embodiment, as an example of an image inspection device and an image inspection method, an image inspection device 1 and an image inspection method in which the illumination setting unit 152 sets the illumination intensity of the backlight unit 163 to a low level are exemplified. However, the image inspection device and the image inspection method are not limited to this, and for example, the illumination intensity of the backlight unit may be set to the same level as other illumination units. However, as described above, by setting the illumination intensity of the backlight unit 163 to a low level, backlit photography can be effectively avoided.

[0048] Furthermore, in the above-described embodiment, as an example of an image inspection device and an image inspection method, an image inspection device 1 and an image inspection method are exemplified in which the illumination setting unit 152 performs lighting switching control to switch between a full lighting mode and a back lighting mode. However, the image inspection device and the image inspection method are not limited to this, and may perform imaging only in the full lighting mode. However, as described above, the lighting switching control makes it possible to illuminate and image the surface shape, etc. of the workpiece in detail, and to perform silhouette imaging that highlights the fine contour shape of the workpiece.

[0049] Furthermore, in the above-described embodiment, an image inspection device 1 in which four illumination units 16 are arranged at 90° intervals around the axis X11 is exemplified as an example of an image inspection device. However, the image inspection device is not limited to this, and any number and locations of illumination units may be adopted. However, as described above, by arranging the four illumination units 16 at 90° intervals around X11, the appearance of the workpiece can be captured more clearly. [Explanation of symbols]

[0050] 1. Image inspection equipment 11 Device frame 12 Mirror Rotating Body 12a Work placement space 13 Photography Department 14 Drive unit 15 Processing section 16 Lighting Department 16a lighting cable 111 Base part 112 Mirror rotation holder 113 Filming holding section 113a Plate section 113b retaining leg 122 Half mirror prism 122a Half mirror 123 Mirror Prism 123a Mirror 131 Camera 132 Camera Lens 141 Motor 142 Rotational Transmission Mechanism 142a Small pulley 142b Big pulley 142b-1 Circular connecting plate 142b-2 Through hole 142c Transmission Belt 151 Photography processing section 152 Lighting Settings 161 Front lighting section 162 Side lighting section 163 Back lighting section D11 Longitudinal direction D12 Erecting direction D13 Rotation direction G11 First captured image G12 Second captured image L11 illumination light L12 reflected light L111 Front illumination light L112 Side lighting L113 Backlight P11 Shooting position S11 Work placement process S12 Mode determination process S13 All lighting setting process S14 Complete lighting process S15 Back lighting setting process S16 Back lighting process S17 Shooting processing process S18 Inspection processing process W1 Terminal-attached wire (work) W2 Twisted shielded pair wire (work) W11 twisted pair wire W12,W21 Electric wire W13 connector terminal W23 Outermost covering part W24 Element wire part X11 axis

Claims

1. a mirror rotor having one or more mirrors rotatably provided around a predetermined axis, which reflects subject light from a workpiece arranged on the axis and guides it to a photographing position; An imaging unit that is installed at the imaging position and receives the subject light to image the workpiece; a plurality of illumination units provided on the mirror rotor so as to rotate together with the mirror rotor about the axis, the illumination units irradiating the workpiece with illumination light from a plurality of directions about the axis to generate the subject light; an illumination setting unit that individually sets the illumination intensity of each of the plurality of illumination units; a drive unit that drives the mirror rotor to rotate around the axis; an imaging processing unit that causes the driving unit to rotate the mirror rotating body and causes the imaging unit to photograph the workpiece when the mirror rotating body is positioned at a preset angle; An image inspection device comprising:

2. The mirror rotating body has a half mirror as one of the mirrors, the half mirror being arranged to face the work and reflecting the subject light, One of the plurality of illumination units is a front illumination unit that is arranged on the front side of the workpiece, with the side on which the half mirror is arranged as seen from the workpiece being the front side of the photographing image, and that irradiates the illumination light by transmitting through the half mirror, 2. The image inspection device according to claim 1, wherein the illumination setting unit sets the illumination intensity of the front illumination unit among the plurality of illumination units to be stronger than the illumination intensity of the other illumination units.

3. The mirror rotating body has a facing mirror as one of the mirrors, the facing mirror being arranged to face the work and reflecting the subject light, One of the plurality of lighting units is arranged on the photographing back side, with the side opposite to the side where the facing mirror is arranged as seen from the work, and serves as a back lighting unit that irradiates the illumination light from the photographing back side, 2. The image inspection device according to claim 1, wherein the illumination setting unit sets the illumination intensity of the backlight unit among the plurality of illumination units to be weaker than the illumination intensity of the other illumination units.

4. The mirror rotating body has a facing mirror as one of the mirrors, the facing mirror being arranged to face the work and reflecting the subject light, One of the plurality of lighting units is arranged on the photographing back side, with the side opposite to the side where the facing mirror is arranged as seen from the work, and serves as a back lighting unit that irradiates the illumination light from the photographing back side, 2. The image inspection device according to claim 1, wherein the illumination setting unit not only individually sets the illumination intensities of the plurality of illumination units, but also performs illumination switching control to switch between a full illumination mode in which all of the plurality of illumination units are turned on and a backlight illumination mode in which only the backlight unit is turned on.

5. 2. The image inspection device according to claim 1, wherein the plurality of illumination units are four illumination units arranged at 90° intervals around the axis.

6. a workpiece placement step of placing the workpiece on the axis in the image inspection device according to any one of claims 1 to 5; an illumination setting step of individually setting the illumination intensity of each of the plurality of illumination units; an imaging process step of causing the driving unit to rotate the mirror rotating body and causing the imaging unit to photograph the workpiece when the mirror rotating body is positioned at a preset angle; An image inspection method comprising:

Images