Inspection system

Abstract

Provided is an inspection system capable of simplifying wiring. The inspection system (1) is provided with: an illuminator (2) that emits light from a plurality of light-emitting elements (20) and illuminates an object (M) to be inspected; a lighting controller (3) that divides the plurality of light-emitting elements (20) into N regions and emits light by sequentially supplying current during respective lighting periods; a camera (4) that sequentially captures an image of the article (M) during an image capture period synchronized with the illumination period; an inspection system control device (5); a first wiring cable (6) for supplying DC power from the camera (4) to the lighting controller (3); and a second wiring cable (7) for supplying DC power from the inspection system control device (5) to the camera, N images captured by the camera (4) being reconfigured as one inspection image by inter-image calculation or by inter-image calculation and inter-pixel calculation.

Description

Technical Field

[0001] The present invention relates to an inspection system for inspecting an object by irradiating light to the object and photographing the object with a camera. Background Art

[0002] Conventionally, when inspecting items (products) produced by a factory production line through an inspection line, the items are illuminated by an illuminator and photographed by a camera so as not to miss defects, foreign matter, etc. The illuminator emits light by receiving a supply of current from a lighting controller to illuminate the item. The camera controls the photographing period by an inspection system control device that controls the entire inspection system, and sends the photographed image to the inspection system control device. The illuminator controller is controlled by the camera or the inspection system control device so that the illumination period of the illuminator is synchronized with the photographing period.

[0003] Here, since the lighting controller supplies a large current required for lighting an article to the lighting device, the required power is generally supplied from an AC outlet via an AC power supply wiring cable as disclosed in Patent Document 1, for example.

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-181589 Summary of the invention

[0007] -Problems to be solved by the invention-

[0008] However, when an AC power wiring cable is set up for the lighting controller in the inspection system, there are also other wiring cables (wiring cables between the inspection system control device and the camera and between the camera (or inspection system control device) and the lighting controller), and the wiring is cumbersome. In addition, it is easy to cause wiring errors.

[0009] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an inspection system capable of simplifying wiring.

[0010] -Methods for solving problems-

[0011] In order to achieve the above-mentioned purpose, the inspection system involved in the embodiment of the present invention comprises: an illuminator, having a plurality of light-emitting elements, emitting light from the plurality of light-emitting elements to illuminate an object to be inspected; a lighting controller, dividing the plurality of light-emitting elements into N (N is a natural number greater than 2) areas, and sequentially supplying current to emit light during the respective lighting periods of the N areas; a camera, sequentially photographing the object during a camera period synchronized with the lighting period; an inspection system control device; a first wiring cable, supplying DC power from the camera to the lighting controller, or from the lighting controller to the camera; and a second wiring cable, supplying DC power from the inspection system control device to the camera, or from the inspection system control device to the lighting controller, wherein the N images photographed by the camera are reconstructed into one inspection image in the inspection system control device or in the camera through inter-image operations, or through inter-image operations and inter-pixel operations.

[0012] Preferably, the inter-image operation is: an operation of selecting the brightness of one image from N images for each pixel, an operation of selecting the brightness of multiple images from N images for each pixel and adding them, or an operation of selecting the brightness of multiple images from N images for each pixel and averaging them.

[0013] Preferably, the first wiring cable supplies the DC power from the camera to the lighting controller and transmits a signal for controlling the lighting period, and the second wiring cable supplies the DC power from the inspection system control device to the camera and transmits a signal for controlling the camera period.

[0014] Alternatively, preferably, the first wiring cable supplies the DC power from the lighting controller to the camera and transmits a signal for controlling the camera period, and the second wiring cable supplies the DC power from the inspection system control device to the lighting controller and transmits a signal for controlling the lighting period.

[0015] The illuminator has red, green and blue light-emitting elements in each of the N areas, and the lighting controller is capable of supplying current to the light-emitting elements of a first color among red, green and blue in sequence to radiate light during the lighting period of each of the N areas, and then, supplying current to the light-emitting elements of a second color other than the first color in sequence to radiate light during the lighting period of each of the N areas, and then, supplying current to the light-emitting elements of a third color other than the first and second colors in sequence to radiate light during the lighting period of each of the N areas.

[0016] -Effects of the Invention-

[0017] According to the inspection system of the present invention, wiring can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic external view showing an inspection system according to an embodiment of the present invention.

[0019] Figure 2 It is a front view showing an example of an illuminator of the above inspection system.

[0020] Figure 3 is a circuit diagram showing an example of an illuminator of the above inspection system.

[0021] Figure 4 This is a waveform diagram showing the timing of illumination and imaging of the same inspection system in a simplified manner.

[0022] Figure 5 is a block diagram showing an example of a lighting controller of the inspection system as above.

[0023] Fig. 6A This is a photograph showing the first image among 16 images as an example of images captured by the camera of the above inspection system.

[0024] Figure 6B This is a photograph showing the second image among 16 images as an example of images captured by the camera of the above inspection system.

[0025] Figure 6C This is a photograph showing the third image among 16 images as an example of images captured by the camera of the above inspection system.

[0026] Fig.6D This is a photograph showing the fourth image among 16 images as an example of images captured by the camera of the above inspection system.

[0027] Fig. 6E This is a photograph showing the fifth image among 16 images as an example of images captured by the camera of the above inspection system.

[0028] Fig. 6F This is a photograph showing the sixth image among 16 images as an example of images captured by the camera of the above inspection system.

[0029] Figure 6G This is a photograph showing the seventh image among 16 images as an example of images captured by the camera of the above inspection system.

[0030] Figure 6H This is a photograph showing the eighth image among 16 images as an example of images captured by the camera of the above inspection system.

[0031] Fig.6I This is a photograph showing the 9th image among 16 images as an example of images captured by the camera of the above inspection system.

[0032] Figure 6J This is a photograph showing the tenth image among 16 images as an example of images captured by the camera of the above inspection system.

[0033] Figure 6K This is a photograph showing the 11th image among 16 images as an example of an image captured by the camera of the above inspection system.

[0034] Figure 6L This is a photograph showing the twelfth image among 16 images as an example of images captured by the camera of the above inspection system.

[0035] Figure 6M This is a photograph showing the 13th image among 16 images as an example of an image captured by the camera of the above inspection system.

[0036] Figure 6N This is a photograph showing the 14th image among 16 images as an example of an image captured by the camera of the above inspection system.

[0037] Fig.6O This is a photograph showing the 15th image among 16 images as an example of an image captured by the camera of the above inspection system.

[0038] Figure 6P This is a photograph showing the 16th image among 16 images as an example of an image captured by the camera of the above inspection system.

[0039] Figure 7 is a block diagram showing an example of a camera of the above inspection system.

[0040] Fig. 8A This is an image in which the brightness of one image is selected for each pixel as an example of an inspection image of the inspection system described above.

[0041] Figure 8B This is an image obtained by selecting the brightness of all (16) images for each pixel and adding them together as an example of an inspection image of the inspection system described above.

[0042] Figure 8CThis is an image in which the brightness of all (16) images is selected for each pixel and averaged as an example of an inspection image of the inspection system described above.

[0043] Fig. 9 1 is a block diagram showing an example of an inspection system control device of the above inspection system.

[0044] Fig.10 This is a schematic external view showing another inspection system according to an embodiment of the present invention.

[0045] Fig.11 is a block diagram showing an example of a lighting controller of another inspection system as above.

[0046] Fig.12 is a block diagram showing an example of a camera of another inspection system as above.

[0047] Fig.13 1 is a block diagram showing an example of an inspection system control device of another inspection system as above. DETAILED DESCRIPTION

[0048] The following describes the method for implementing the present invention. Figure 1 As shown, the inspection system 1 according to the embodiment of the present invention includes an illuminator 2, an illumination controller 3, a camera 4, an inspection system control device 5, a first wiring cable 6, and a second wiring cable 7. Figure 1 FIG. 4 shows a state where the object M is illuminated by the illuminator 2 and photographed by the camera 4. Figure 1 In the figure, a coffee bottle is exemplified as the object M, the illuminator 2 is arranged at the depth side of the object M, the light emitting surface (front surface) is inclined toward the front, and the camera 4 is arranged above the object M. In addition, the inspection system control device 5 is usually relatively far away.

[0049] The illuminator 2 has a plurality of light emitting elements (LEDs, etc.) 20. Light is radiated from the plurality of light emitting elements 20 to illuminate the object M to be inspected. The illuminator 2 can be a surface illuminator in which the plurality of light emitting elements 20 are arranged in a planar shape (vertically and horizontally), a line illuminator arranged in a linear shape, a ring illuminator arranged in a ring shape, etc. Figure 1 and the following Figure 2 The luminaire 2 shown is a surface luminaire in which 192 light emitting elements 20 are arranged in a surface shape, 12 in the vertical direction and 16 in the horizontal direction.

[0050] The luminaire 2 can be configured to be divided into Figure 2 As shown in FIG. N To be supplied with current, so that according to the area 2A1 ~ 2A N Each (i.e., each area 2AJ (J is any natural number from 1 to N)) to emit light. Figure 2 In the figure, the dotted lines represent the regions 2A J The division is as follows: N is set to 16, and each area is 2A J The number of the light emitting elements 20 is 3 in the vertical direction and 4 in the horizontal direction, which is 12 in total.

[0051] The illuminator 2 is connected in parallel and / or in series with a plurality of light emitting elements 20. Figure 3 As shown, the lighting device 2 can be set according to each area 2A J Each of the settings to set the current flowing into terminal 2I J and current flows out of terminal 2O J In addition, Figure 3 The component indicated by symbol 21 is a resistor for current limiting. The current flows into the terminal 2I J and current flows out of terminal 2O J Any of them can be in the area 2A1~2A N Shared between.

[0052] The lighting controller 3 divides the plurality of light emitting elements 20 into N areas 2A1 to 2A N , in each area 2A J The current I is supplied sequentially during the lighting period Ta. J To radiate light.

[0053] The lighting controller 3 is operated by supplying DC (direct current) power from the first wiring cable 6. The lighting controller 3 uses the supplied DC power while maintaining the voltage as it is or by stepping up or down the voltage.

[0054] The lighting period Ta is synchronized with the imaging period Td described later, and the lighting period Ta is controlled by a signal for controlling the lighting period Ta (including a synchronization signal SY for the imaging period Td and the lighting period Ta) transmitted by the first wiring cable 6. (See Figure 4 ). The lighting period Ta is preset, for example, it can be set to 5 milliseconds to 20 milliseconds. The current supply can use a PWM pulse current. The PWM period Tb can be set to about 8 microseconds, for example. The PWM pulse width Tc is the time width corresponding to the preset dimming color level. In addition, Figure 4 In order to make the above-mentioned period Tb and pulse width Tc easier to understand, they are shown in an enlarged manner.

[0055] The detailed structure of the lighting controller 3 is not particularly limited, but for example Figure 5As shown, it can be provided with a CPU 31, a program unit 32, a set value storage unit 33, a working memory unit 34, an interface unit 35, a setting unit 36, and a lighting device current supply unit 37. In the lighting controller 3, the CPU 31 controls each unit according to the program stored in the program unit 32 and using the working memory unit 34.

[0056] The interface 35 is a portion to which the first wiring cable 6 is connected. The first wiring cable 6 can be provided with a power line 6DC for supplying DC power, a signal line 6SI for controlling a signal during the lighting period Ta, and a ground line 6GND, and terminals to which the lines are connected can be provided at the interface 35. The signal line 6SI is one or more.

[0057] The setting unit 36 ​​can make the setting value storage unit 33 store the above-mentioned lighting period Ta, pulse width Tc and other values ​​set by the setting dial 36D and the like. The setting value storage unit 33 can use a non-volatile memory and the like. The lighting current supply unit 37 can be set to be provided with respective areas 2A of the lighting device 2. J The current flows into terminal 2I J and current flows out of terminal 2O J Connect the illuminator current outflow terminal 37O J , lighting current flows into terminal 37I J .

[0058] In addition, the lighting controller 3 and the lighting device 2 may be independently provided and connected by a connection member 8 (wiring cable etc.), or may be integrated.

[0059] Next, the camera 4 will be described.

[0060] The camera 4 supplies DC power to the lighting controller 3 via the first wiring cable 6. The DC power has a voltage of 3.3V, 5V, etc., for example.

[0061] The camera 4 can only supply a small amount of power to the outside. J Supply current I sequentially (rather than all at once) J , so the required power can be less. Therefore, the camera 4 can supply the required power to the lighting controller 3.

[0062] In this way, the lighting controller 3 need not be connected to the AC power supply wiring cable but only to the first wiring cable 6 from the camera 4. This simplifies the wiring.

[0063] Furthermore, the camera 4 transmits a signal for controlling the lighting period Ta including the synchronization signal SY to the lighting controller 3 via the first wiring cable 6 .

[0064] Furthermore, the camera 4 sequentially photographs the objects M during the photographing period Td synchronized with the illumination period Ta (see Figure 4 That is, in synchronization with the synchronization signal SY transmitted from the camera 4, the area 2A of the lighting device 2 is illuminated during the illumination period Ta. J The camera 4 takes pictures during the shooting period Td. Figure 4 In the example, PH is used to indicate the signal to start shooting.

[0065] In this way, N images of the same object M taken from the same position can be obtained by only different illumination. For example, when N is 16, the following can be obtained: Figure 6A to Figure 6P In addition, Fig. 6A This is a photograph of the area 2A1 of the illuminator 2 when light is radiated. Figure 6B This is a photograph of the area 2A2 of the illuminator 2 radiating light. Figure 6C This is a photograph of the area 2A3 of the illuminator 2 when light is radiated. Fig.6D This is a photograph of the area 2A4 of the illuminator 2 when light is radiated. Fig. 6E This is a photograph of the area 2A5 of the illuminator 2 when light is radiated. Fig. 6F This is a photograph of the area 2A6 of the illuminator 2 when light is radiated. Figure 6G This is a photograph of the area 2A7 of the illuminator 2 when light is radiated. Figure 6H This is a photograph of the area 2A8 of the illuminator 2 when light is radiated. Fig.6I This is a photograph of the area 2A9 of the illuminator 2 when light is radiated. Figure 6J It is the area 2A of the illuminator 2 10 The photo when the light was radiated, Figure 6K It is the area 2A of the illuminator 2 11 The photo when the light was radiated, Figure 6L It is the area 2A of the illuminator 2 12 The photo when the light was radiated, Figure 6M It is the area 2A of the illuminator 2 13 The photo when the light was radiated, Figure 6N It is the area 2A of the illuminator 2 14 The photo when the light was radiated, Fig.6O It is the area 2A of the illuminator 2 15 The photo when the light was radiated, Figure 6P It is the area 2A of the illuminator 2 16 Photographs taken when light was emitted.

[0066] The camera 4 is operated by being supplied with DC (direct current) power from the second wiring cable 7. In the camera 4, the DC power supplied is used by maintaining the voltage as it is or by stepping up or down the voltage. In addition, as described above, the camera 4 supplies DC power to the lighting controller 3 via the first wiring cable 6, but the voltage of the DC power supplied to the lighting controller 3 may be the same as the voltage of the DC power supplied from the second wiring cable 7, or may be a voltage after stepping up or down the voltage.

[0067] The imaging period Td of the camera 4 is controlled by a signal for controlling the imaging period Td transmitted by the second wiring cable 7. The synchronization signal SY transmitted from the camera 4 to the lighting controller 3 may be generated in the camera 4 in synchronization with the imaging period Td, or may be transmitted by the second wiring cable 7.

[0068] Furthermore, the N images (or one inspection image described later) captured by the camera 4 are transmitted to the inspection system control device 5 described later via the second wiring cable 7 .

[0069] The detailed structure of the camera 4 is not particularly limited, but for example Figure 7 As shown, the camera 4 may include a CPU 41, a program unit 42, a working memory unit 43, a first interface unit 44, a second interface unit 45, and an imaging unit 46. In the camera 4, the CPU 41 controls each unit using the working memory unit 43 according to a program stored in the program unit 42.

[0070] The first interface unit 44 can be provided with terminals to which the above-mentioned power line 6DC of the first wiring cable 6 , the signal line 6SI of a signal for controlling the lighting period Ta, and the ground line 6GND are respectively connected.

[0071] The second interface 45 is a portion to which the second wiring cable 7 is connected. The second wiring cable 7 can include a power line 7DC for supplying DC power, a signal line 7SI for transmitting a signal or an image for controlling the imaging period Td, and a ground line 7GND, and terminals for connecting the lines can be provided at the second interface 45. The signal line 7SI is usually a plurality of lines.

[0072] The imaging unit 46 performs imaging during the imaging period Td described above by means of the imaging device 46M. Figure 6A to Figure 6P As shown, it is possible to shoot in monochrome.

[0073] Next, the inspection system control device 5 is described. In the inspection system control device 5, N images are reconstructed into one inspection image through inter-image operations, or through inter-image operations and inter-pixel operations. The inspection image is an image observed by an inspector using the inspection system 1. In addition, the so-called inter-image operation refers to an operation between multiple images, and the so-called inter-pixel operation refers to an operation between adjacent pixels that form an image.

[0074] As a specific example, the inter-image operation can be an operation for selecting the brightness of one image from N images for each pixel. For example, when N is 16, it can be set to select the brightness of the Kth (K is any natural number from 1 to 16) highest brightness among each pixel. In this way, it can be reconstructed to be the same as the N areas 2A1 to 2A2 of the illuminator 2. N The image obtained by emitting light once is equivalent to Fig. 8A In addition, various inspection images can be obtained depending on what number K is set to. Fig. 8A , K is 8.

[0075] In addition, as a specific example, the inter-image operation can also be set as an operation in which the brightness of multiple images is selected from N for each pixel and added. For example, when N is 16, it can be set as an operation in which the brightness of each pixel is selected from the brightness of the Kth (K is any natural number from 1 to 16) to the brightness of the Lth (L is any natural number from 2 to 16 greater than K) highest and added. In this way, it can also be reconstructed as an operation with N areas 2A1 to 2A2 of the lighting device 2. N One inspection image that is equivalent to an image obtained by radiating light at one time. In addition, various inspection images can be acquired depending on which numbers K and L are set to.

[0076] For example, if K is set to 1 and L is set to 16, and the brightness of all (16) images is selected in each pixel and added, it can be reconstructed as Figure 8B An inspection image as shown.

[0077] In addition, as a specific example, the inter-image operation can also be set as an operation that selects the brightness of multiple images from N for each pixel and averages them. For example, when N is 16, it can be set as an operation that selects the brightness of the Kth (K is any natural number from 1 to 16) highest brightness to the Lth (L is any natural number from 2 to 16 greater than K) highest brightness in each pixel and averages them. In this way, it can also be reconstructed as an operation with N areas 2A1 to 2A2 of the lighting device 2. N One inspection image that is equivalent to an image obtained by radiating light at one time. In addition, various inspection images can be acquired depending on which numbers K and L are set to.

[0078] For example, if K is set to 1 and L is set to 16, and the brightness of all (16) images is selected and averaged in each pixel, it can be reconstructed as Figure 8C An inspection image as shown.

[0079] The above-mentioned specific example of inter-image calculation can also reconstruct one inspection image by further combining various inter-pixel calculations.

[0080] The above-mentioned reconstruction of the inspection image may be performed not in the inspection system control device 5 but in the camera 4. The inspection system control device 5 can also perform various processes such as sending the inspection image to a display device or exchanging data with a system outside the inspection system 1.

[0081] The detailed structure of the inspection system control device 5 is not particularly limited, but for example Fig. 9 As shown, it can include a CPU 51, a program unit 52, a working memory unit 53, an interface unit 54, and a power supply unit 55. In the inspection system control device 5, the CPU 51 controls the interface unit 54 and the like using the working memory unit 53 according to the program stored in the program unit 52. The program unit 52 includes a program for reconstructing the inspection image.

[0082] The interface portion 54 can be provided with terminals to which the above-mentioned power line 7DC, signal line 7SI, and ground line 7GND of the second wiring cable 7 are connected respectively.

[0083] The power supply unit 55 is connected to the AC power supply wiring cable 9 , generates DC power for the inspection system control device 5 from the AC power supply, and supplies the DC power to each unit in the inspection system control device 5 .

[0084] Next, another inspection system 1' according to an embodiment of the present invention will be described. Fig.10 As shown, the inspection system 1' includes an illuminator 2, an illumination controller 3', a camera 4', an inspection system control device 5', a first wiring cable 6', and a second wiring cable 7'. The illuminator 2 is the same as described above. The illumination controller 3', the camera 4', the inspection system control device 5', the first wiring cable 6', and the second wiring cable 7' correspond to the illumination controller 3, the camera 4, the inspection system control device 5, the first wiring cable 6, and the second wiring cable 7 described above, respectively, but in appearance, the wiring method of the second wiring cable 7' of the inspection system 1' is different from the wiring method of the second wiring cable 7 in the inspection system 1. Therefore, the illumination controller 3', the camera 4', the inspection system control device 5', the first wiring cable 6', and the second wiring cable 7' are different from the illumination controller 3, the camera 4, the inspection system control device 5, the first wiring cable 6, and the second wiring cable 7 in the following aspects, respectively.

[0085] The lighting controller 3' is operated by supplying DC (direct current) power from the second wiring cable 7', and is controlled by a signal for controlling the lighting period Ta transmitted by the second wiring cable 7'. In addition, the lighting controller 3' sends a signal for controlling the camera period Td including a synchronization signal SY to the camera 4' via the first wiring cable 6'. The synchronization signal SY can be generated in the lighting controller 3' in synchronization with the lighting period Ta, or can be transmitted by the second wiring cable 7'. In addition, the lighting controller 3' receives N images (or 1 inspection image) captured by the camera 4' via the first wiring cable 6', and transmits them to the inspection system control device 5' via the second wiring cable 7'.

[0086] In this way, the lighting controller 3 ′ controls each area 2A of the lighting device 2. J Supply current I sequentially (not all at once) J Since the required power can be less, it is sufficient to connect only the second wiring cable 7' from the inspection system control device 5' and the first wiring cable 6' toward the camera 4' without connecting the AC power wiring cable. This simplifies the wiring.

[0087] like Fig.11 As shown, the detailed structure of the lighting controller 3' can be set to include a first interface part 35A and a second interface part 35B instead of the interface part 35 in the lighting controller 3. The first interface part 35A is a part to which the first wiring cable 6' is connected. The first wiring cable 6' can be set to include a power line 6DC' for supplying DC power, a signal line 6SI' for transmitting a signal and an image during the imaging period Td, and a ground line 6GND', and the terminals to which the lines are connected can be set at the first interface part 35A. The signal line 6SI' is usually a plurality of lines.

[0088] The second interface 35B is a portion to which the second wiring cable 7' is connected. The second wiring cable 7' can be provided with a power line 7DC' for supplying DC power, a signal line 7SI' for transmitting a signal for controlling the lighting period Ta, an image, etc., and a ground line 7GND', and the terminals to which the lines are connected can be provided at the second interface 35B. There are usually a plurality of signal lines 7SI'.

[0089] The camera 4' is operated by supplying DC (direct current) power from the first wiring cable 6'. As described above, the N images (or one inspection image) captured by the camera 4' are transmitted to the inspection system control device 5' via the first wiring cable 6' and the second wiring cable 7'.

[0090] like Fig.12As shown, the detailed structure of the camera 4' can be set without the second interface part 45 in the camera 4, and an interface part 44' can be provided instead of the first interface part 44. The interface part 44' can be provided with terminals for connecting the above-mentioned power line 6DC', signal line 6SI', and ground line 6GND' of the first wiring cable 6'.

[0091] like Fig.13 As shown, the detailed structure of the inspection system control device 5' can be set to include an interface unit 54' instead of the interface unit 54 in the inspection system control device 5. The interface unit 54' can be provided with terminals for connecting the power line 7DC', signal line 7SI', and ground line 7GND' of the second wiring cable 7'.

[0092] Next, a case where the lighting device 2 of the inspection system 1 and 1 ′ is a color lighting will be described. In this case, the camera 4 (or 4 ′) can capture images in monochrome.

[0093] Illuminator 2 is divided into N areas 2A1 to 2A N Each of the regions 2A1 to 2A2 has a red, green, and blue light emitting element 20. Furthermore, the red, green, and blue light emitting elements 20 can be configured to be arranged in the regions 2A1 to 2A3. N The current inflow terminals 2I1 to 2I N And current outflow terminals 2O1~2O N .

[0094] The lighting controller 3 (or 3') is in N areas 2A1-2A N In each lighting period Ta, current is sequentially supplied to the light emitting element 20 of the first color among red, green, and blue to emit light, and then, in the N regions 2A1 to 2A N In each lighting period Ta, current is sequentially supplied to the light emitting elements 20 of the second color other than the first color to emit light, and then, in the N regions 2A1 to 2A N In each lighting period Ta, current is sequentially supplied to the light emitting elements of a third color other than the first color and the second color to emit light.

[0095] The camera 4 (or 4') sequentially takes pictures during the shooting period Td in the same manner as described above. In the inspection system control device 5 (or 5'), it is set that one inspection image is reconstructed for red, green, and blue in the same manner as described above, and these three inspection images can be further synthesized. As a result, one color inspection image can be generated.

[0096] The inspection system according to the embodiment of the present invention has been described above, but the present invention is not limited to the contents described in the embodiment, and various design changes can be made within the scope of the matters described in the claims. For example, although the effect of simplification of wiring is reduced, it is also possible to provide a third wiring cable in the inspection system 1', and transmit N images (or 1 inspection image) captured by the camera 4' directly to the inspection system control device 5' via the third wiring cable.

[0097] -Explanation of symbols-

[0098] 1.1' Check the system

[0099] 2 illuminators

[0100] 20 Light-emitting element

[0101] 21 Resistors

[0102] 2A J (2A1~2A N ) Area

[0103] 2I J (2I1~2I N ) Current flows into the terminal

[0104] 2O J (2O1~2O N ) Current outflow terminal

[0105] 3.3' Lighting Controller

[0106] 31 CPU

[0107] 32 Program Department

[0108] 33 Setting value storage unit

[0109] 34 Working memory section

[0110] 35 Interface

[0111] 35A 1st interface

[0112] 35B 2nd interface

[0113] 36 Setting Department

[0114] 36D Setting Dial

[0115] 37 Illuminating current supply unit

[0116] 37I J (37I1~37I N ) The lighting current flows into the terminal

[0117] 37O J (37O1~37O N ) Illuminating current outflow terminal

[0118] 4. 4' Camera

[0119] 41 CPU

[0120] 42 Program Department

[0121] 43 Working memory section

[0122] 44 1st interface

[0123] 44' Interface

[0124] 45 2nd interface

[0125] 46 Camera Department

[0126] 46M Camera Mechanism

[0127] 5.5' Check system control device

[0128] 51 CPU

[0129] 52 Program Department

[0130] 53 Working memory section

[0131] 54, 54' interface

[0132] 55 Power Supply

[0133] 6, 6' 1st wiring cable

[0134] 6DC, 6DC' power cord

[0135] 6SI, 6SI' signal line

[0136] 6GND, 6GND' ground wire

[0137] 7, 7' 2nd wiring cable

[0138] 7DC, 7DC' power cord

[0139] 7SI, 7SI' signal line

[0140] 7GND, 7GND' ground wire

[0141] 8 Connecting components

[0142] 9AC power wiring cable

[0143] I J (I1~I N) Current

[0144] M Items

[0145] PH signal to turn on the camera

[0146] SY Synchronous signal

[0147] During the lighting period

[0148] Tb PWM period

[0149] Tc PWM pulse width

[0150] Td During filming.

Claims

1. An inspection system comprising: An illuminator having a plurality of light emitting elements, and emitting light from the plurality of light emitting elements to illuminate an object to be inspected; A lighting controller that divides the plurality of light-emitting elements into N regions and sequentially supplies current to emit light during lighting periods of the N regions, where N is a natural number greater than or equal to 2; A camera that sequentially photographs the objects during a photographing period synchronized with the lighting period; Check system controls; a first wiring cable for supplying DC power from the camera to the lighting controller or from the lighting controller to the camera; and a second wiring cable for supplying DC power from the inspection system control device to the camera, or for supplying DC power from the inspection system control device to the lighting controller, The N images captured by the camera are reconstructed into one inspection image by inter-image calculation or inter-image calculation and inter-pixel calculation in the inspection system control device or in the camera.

2. The inspection system according to claim 1, wherein: The inter-image operation is: an operation of selecting the brightness of one of the images from N for each pixel, or an operation of selecting the brightness of multiple images from N for each pixel and adding them, or an operation of selecting the brightness of multiple images from N for each pixel and averaging them.

3. The inspection system according to claim 1 or 2, wherein: The first wiring cable supplies the DC power from the camera to the lighting controller and transmits a signal for controlling the lighting period. The second wiring cable supplies the DC power from the inspection system control device to the camera and transmits a signal for controlling the imaging period.

4. The inspection system according to claim 1 or 2, wherein: The first wiring cable supplies the DC power from the lighting controller to the camera and transmits a signal for controlling the imaging period. The second wiring cable supplies the DC power from the inspection system control device to the lighting controller, and transmits a signal for controlling the lighting period.

5. The inspection system according to claim 1 or 2, wherein: The illuminator has red, green and blue light emitting elements for each of the N regions. The lighting controller sequentially supplies current to the light-emitting elements of a first color among red, green, and blue to radiate light during the lighting period of each of the N areas, and then sequentially supplies current to the light-emitting elements of a second color other than the first color to radiate light during the lighting period of each of the N areas, and then sequentially supplies current to the light-emitting elements of a third color other than the first and second colors to radiate light during the lighting period of each of the N areas.

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