KR101955238B1 - Lighting system, inspection system and control system - Google Patents

Abstract

Wherein the illumination system captures a first surface of the inspected object on which the mark is printed, the first surface having the mark on the periphery of the mark, and inspects the position of the design of the inspected object based on the sensed image Is used. This illumination system is provided with a light source which is disposed on the back surface side of the first surface of the inspected object and has an upper end located above the inspected object and a lower end located below the inspected object, And a reflecting member disposed on the first surface side above the inspected object and inclined with respect to the irradiation direction of the light so as to face the first surface of the inspected object and reflecting the light from the illumination. The illumination directly irradiates light to the back surface of the first surface of the inspected object and indirectly irradiates the first surface of the inspected object through the reflective member.

Description

TECHNICAL FIELD [0001] The present invention relates to a lighting system, an inspection system, and a control system,

The present invention relates to an illumination system, an inspection system and a control system.

The present application claims priority based on Japanese Patent Application No. 2011-120962 filed on May 30, 2011, the contents of which are incorporated herein by reference.

Fig. 13 is a schematic view showing the shape of a charger P0 for carrying out a process of filling contents with a tube such as a plastic tube or a laminated tube.

A charger P0 for performing a process of charging the contents with a tube is usually provided in the clean room R. [ The charger P0 is covered by a protective cover made of a metal matrix so that dust and dirt do not enter the tube. The protective cover has a transparent portion such as polycarbonate. Therefore, the worker W can confirm the tube in the charger P0 by the light from the light L0 installed in the clean room R. FIG.

In this process, the contents of the tube are filled, and the opening end of the tube is thermally fused and compression-bonded, followed by heat sealing, and then the position of the tube design is inspected.

Conventionally, the inspection of the position of the tube design was performed by a worker. However, in order to inspect tubes thoroughly, it is necessary to perform this inspection in inline of the production process, which requires a lot of labor and takes time.

Therefore, it is considered to detect the position of the tube design by imaging the tube and processing the sensed inspection image. Patent Documents 1 and 2 disclose techniques for inspecting the appearance of an inspected object by image processing. Patent Document 3 describes a technique of irradiating an inspection object with inspection light and inspecting the surface of the inspection object based on the change of the reflection light.

Japanese Unexamined Patent Application Publication No. 6-1249 Japanese Patent Application Laid-Open No. 2007-161257 Japanese Patent Application Laid-Open No. 2005-291771

However, since the charger is covered with the metal cover, the light amount is insufficient for capturing a proper inspection image for image processing even though the brightness of the charger is as bright as the human eye can design the tube in the charger. For this reason, it is considered that illumination is provided in the charger, and the tube is irradiated with light directly to pick up the image. However, when there is gloss on the surface of the tube, there arises a problem in that a stable inspection image can not be obtained because the tube surface is streaked.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide an image pickup apparatus capable of capturing an image capable of detecting the position of a tube design by image processing even if the tube has a gloss on the tube surface while preventing dust and / An illumination system, an inspection system, and a control system.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. An illumination system according to an embodiment of the present invention is an illumination system in which an image of a first surface having a gloss around the mark is taken as a surface of the inspected object on which the mark is printed, It is used in the inspection system to check the position. The illumination system includes a light source for emitting light having an upper end positioned above the inspected object and a lower end located below the inspected object and disposed on a rear surface side of the first surface of the inspected object, And a reflecting member which is disposed above the inspected object as the first surface side of the inspection object and which is inclined with respect to the irradiation direction of the light so as to face the first surface of the inspected object and reflects the light from the illumination. The illumination directly irradiates light to the rear surface of the first surface of the back surface of the inspected object and indirectly irradiates light to the first surface of the inspected object through the reflective member.

The illumination system may further include an imaging unit disposed on the side opposite to the illumination with respect to the reflecting member to obtain an image including at least the left and right ends of the mark and the inspected object by imaging the first surface of the inspected object .

In the illumination system, the material of the reflecting surface of the reflecting member may be polytetrafluoroethylene.

An inspection system according to an embodiment of the present invention uses the illumination system to detect the position of the design of the inspected object. The inspection system includes an imaging unit for imaging the first surface of the inspected object, a determination unit for determining a range in which the mark should be present in the image picked up by the imaging unit, And a detection unit for detecting the position of the design of the inspected object based on the presence or absence of the mark.

A control system according to an embodiment of the present invention uses the inspection system to determine good or defective products of an inspected object flowing through a production line. The control system includes a control unit that determines a good or a defective product of each of the inspected objects flowing through the production line based on the detection result by the detection unit.

(Effects of the Invention)

According to the present invention, the inspection object is illuminated from the back surface of the first surface on which the mark is printed, and the light irradiated from the illumination is reflected to the first surface of the inspected object by the reflection member. Therefore, even when there is gloss on the surface of the inspected object, it is possible to prevent the halation, and the mark of the inspected object can be clearly picked up. As a result, it is possible to pick up an image that can detect the position of the design by image processing even if the object is glossy with the surface while preventing the dust or the dust from being mixed into the inspected object by covering the cover with the charger.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram for explaining a definition of a term according to an embodiment of the present invention; FIG.
2 is a view showing the result of measurement of the glossiness in the inspected object.
3 is a schematic view showing an example of a charger into which the control system according to the present embodiment is introduced.
4 is a schematic diagram showing the configuration of a control system according to the present embodiment.
5 is a block diagram showing the functional configuration of the inspection system according to the present embodiment.
Fig. 6 is a schematic view showing an installation position of the illumination system according to the present embodiment.
7 is a diagram showing an image picked up by the illumination system according to the present embodiment.
8A is an explanatory diagram of an affirmative judgment process in the image processing apparatus according to the present embodiment.
Fig. 8B is an explanatory diagram of the positive / negative determination processing in the image processing apparatus according to the present embodiment.
FIG. 8C is an explanatory diagram of an affirmative judgment process in the image processing apparatus according to the present embodiment. FIG.
Fig. 8D is an explanatory diagram of the positive / negative determination processing in the image processing apparatus according to the present embodiment.
Fig. 9 is a flow chart showing the procedure of the positive / negative determination process according to the present embodiment.
10A is a diagram showing the result of imaging by a camera in the illumination system according to the present embodiment.
Fig. 10B is a diagram showing the image pickup result of the camera in the illumination system according to the present embodiment. Fig.
Fig. 10C is a diagram showing the image pickup result of the camera in the illumination system according to the present embodiment. Fig.
11 is a diagram showing an experimental result of an inspection system according to the present embodiment.
12 is a graph showing changes in illuminance at the tube position according to the present embodiment.
13 is a schematic view showing the shape of a charger for carrying out a process of filling contents with a tube.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, referring to FIG. 1, the following words are defined as follows.

The inspected object according to the present embodiment is a tube T such as a plastic tube or a laminate tube, and has a glossy surface on the printed surface around the mark I. The gloss in the present embodiment refers to a characteristic in which, when light from a light source is reflected by a reflective object, a mirror image of the light source is reflected on the surface of the reflective object. For example, when a light is directly applied to a glossy object such as aluminum or stainless steel, a mirror image of the light source is reflected on the surface. The gloss can be judged by measuring the glossiness in addition to the visual judgment. The glossiness is a numerical value showing the result of specular reflection of the light hitting the surface of the reflective object. The shine in the present embodiment means that the glossiness measured by the measuring instrument under predetermined measurement conditions is not less than a predetermined value (100 or more in this embodiment (100 or 100 OVER (reference value))). In the present embodiment, it is preferable that the glossiness of a glossy one is 1000 or less. Therefore, it is preferable that the glossy degree of gloss on the printed surface around the mark I is 100 or more and 1000 or less. The gloss was quoted from JIS Z 8741-1997 and measured with Groschi et al. (IG-320) of Horiba Seisakusho Co., Ltd. as a measuring instrument. A method of measuring glossiness will be described. First, only the measurement plane was cut out from the cylindrical laminate tube, and the measurement plane was flattened. Then, the glossiness of the surface of the measurement surface was measured with a gross streak. The conditions for measuring the glossiness will be described. The gloss of the laminate tube was measured at an incidence angle of 60 degrees and an angle of reflection of 60 degrees with respect to the gloss of the surface of the glass plate having a refractive index of 1.567 as a reference (100). In this case, the specular reflectance of the glass plate is 10%. Therefore, the glossiness is 1000 when the mirror reflectance is 100%.

Fig. 2 shows measurement results of the degree of gloss of a measurement object determined to have no gloss (no apparent gloss " No ") and a measurement object determined to have gloss (glossiness "present") visually. The measurement objects "Brilliant Mower Fresh Spear Mint", "Dent Healthless Abrasive Gel", "Dent Health SP", "Dent Health Intrusion Block (registered trademark)", "Hightech (registered trademark)", "Hightech mild" Is a laminate tube. As shown in Fig. 2, the glossiness in "Brilliant Mower Fresh Spear Mint", "Dent Healthless Polishing Gel", "Dent Health SP" and "Dent Health Immersion Block (registered trademark)" having an apparent gloss " OVER ". On the other hand, the glossiness in the "hightech (registered trademark)", "hightemtmild" and "system sensitive", which are apparently "none", is less than 100.

Returning to Fig. 1, the description of the tube T is continued. A mark (I) is printed on the tube (T). The surface of the tube T on which the mark I is defined is defined as a front surface (first surface). Further, the back surface of the surface of the tube T on which the mark I is defined is defined as the back surface. The mark I is a mark for detecting the deviation (position) of the design in the tube T. The color of the mark I (for example, black) is referred to as a mark color. The portion of the tube T that is heat-sealed by thermally melting and pressing the opening portion is referred to as an end sealing portion E. The tube sealing portion E side is set to be upward while the tube T is standing and the up and down direction is set downward with the main outlet (cap C) side down. The direction orthogonal to the up-and-down direction is defined as the left-to-right direction when the front surface of the tube T is in the frontal state while the tube T stands up with the cap C down.

That is, the tube T comprises a first side surface and a second side surface which are substantially symmetrical. The upper ends of the first side surface and the second side surface are joined by the end sealing portion E. Both left and right ends of the first and second sides are continuous. The outer surfaces of the first side surface and the second side surface are substantially opposite to each other. The outer surface of the first side is the front surface of the tube T. And the outer surface of the second side is the back surface of the tube T. [

3 is a schematic view showing an example of a charger P into which the control system according to the present embodiment is introduced.

The charging device P is a production line for charging the contents of a toothpaste or the like into the tube T and heat-sealing the opening of the tube T after charging.

At the center of the charger P, a table in the form of a race track is provided. And a plurality of tubular tube holders provided in the periphery of the table are horizontally movable in the circumferential direction of the table in an aligned state. These tube holders are configured to move around the table by a transport mechanism (not shown) installed along the peripheral surface of the table.

The tube T is supplied from the supply part 101 of the charger P to the tube holder and moves to the discharge part 112 along the circumferential surface of the table. The new tubes T are supplied to the tube holder in a state in which the cap C side of the new tubes T is opened downward. Next, the tube insertion portion 102 presses the tube T into the tube holder and inserts the tube T into the tube holder. Next, the cap identifying unit 103 confirms that the cap C is attached to the tube T by the sensor. Then, the foreign material removing unit 104 blows clean air into the tube T to remove foreign matter in the tube T. [ Then, the insulator 105 charges the contents of the tube T.

The mark alignment section 106 detects the mark I of the tube T by the color sensor and aligns the tube T so that the mark I is directed in a predetermined direction. Then, the breed identification unit 107 confirms the breed of the tube T by the camera. Then, the heat sealing portion 108 heat-seals the opening portion of the tube T by thermally melting and pressing. Then, the package lot imprinting section 109 stamps the packaging lot on the end sealing section E. Then, the appearance inspection unit 110 inspects the position of the design of the tube T. [ Then, the R cutter portion 111 cuts the end portion of the end sealing portion (E). Finally, the discharge unit 112 discharges the tube T by a damper type conveyor 113 in a post-process.

4 is a schematic diagram showing the configuration of a control system according to the present embodiment.

The control system checks the position of the design of the tube T in the visual inspection unit 110 in the charger P. [ The control system includes an illumination unit 1, a reflection plate 2, a camera (imaging unit) 3, an image processing apparatus 4, and a sequencer 5. The illumination unit 1, the reflection plate 2, and the camera 3 are installed in the visual inspection unit 110 in the charger P. The illuminator (1) irradiates light to the back surface of the tube (T) flowing in the charger (P) and the reflection plate. The reflecting plate (reflecting member) 2 reflects the light from the illumination 1 to the front of the tube T. [ The camera 3 takes an image of the front surface of the tube T to generate an image, and outputs the generated image to the image processing apparatus 4. [ Hereinafter, a system constituted by the illumination unit 1, the reflection plate 2, and the camera 3 is referred to as an illumination system. The detailed configuration of the illumination system will be described later.

The image processing apparatus 4 detects the left-right shift of the design in the tube T based on the image input from the camera 3. [ Then, the image processing apparatus 4 judges a good or defective product of the tube T based on the detection result, and outputs the determination result to the sequencer 5. The sequencer 5 judges the good or defective of each of the tubes T flowing in the charger P based on the input judgment result and stores the status information (good or defective) in the respective tubes T . The sequencer (5) then outputs an operation instruction to the damper type conveyor (113) based on the status information of each tube (T). For example, the sequencer 5 outputs an operation instruction to the damper type conveyor 113 to discharge the tube T in a post-process (first direction) of the production line when the tube T is good. On the other hand, when the tube T is a defective product, the sequencer 5 outputs an operation instruction to the damper-type conveyor 113 to discharge the tube T out of the production line (second direction).

5 is a block diagram showing the functional configuration of the inspection system according to the present embodiment.

The inspection system is used in the above-described control system, and is a system for judging good or defective products of the tube T. The inspection system includes an illumination system, an image processing apparatus 4, an input unit 6, an illumination control unit 7, and a display unit 8. The detailed configuration of the illumination system will be described later.

The input unit 6 receives an input of a control value for controlling the illuminance of the illumination light 1. The illumination control unit 7 controls the illuminance of the illumination 1 based on the control value input by the input unit 6. Specifically, the illumination control section 7 controls the illuminance of the illumination 1, for example, by changing the supply voltage or current to the illumination 1. [ The display unit 8 displays an image captured by the camera 3. [ With this configuration, the operator can set the illuminance of the illumination 1 by the input unit 6 while confirming the image displayed on the display unit 8 at the time of the inspection. As a result, the illuminance of the illumination light 1 can be adjusted according to the size, shape, and design of the tube T as an inspected object.

The image processing apparatus 4 for determining a good or defective product of the tube T based on an image captured by the camera 3 includes an image input unit 401, an edge detection unit 402, a window determination unit 403, A shift detection section 404, a determination section 405, and a determination result output section 406. [ The image processing apparatus 4 judges the good or defective product of the tube T based on the position of the mark I of the tube T. [ The image input unit 401 receives input of an image from the camera 3 and outputs the input image to the display unit 8 and the edge detection unit 402. [ The edge detecting unit 402 detects the edge of the left end of the tube T in the input image. The window determination unit 403 determines a mark detection window that is a range in which the mark I should exist based on the edge of the left end detected by the edge detection unit 402. [

The shift detection section 404 detects a shift in the design of the tube T based on whether or not the mark I is present in the mark detection window determined by the window determination section 403. [ Specifically, the misalignment detector 404 counts the number of pixels of the mark color in the mark detection window and judges that the mark I exists in the mark detection window when the number of counted pixels is within the predetermined range (alpha). The upper limit value and the lower limit value of the range [alpha] are set in advance. For example, the range [alpha] is regarded as a pixel or the like of 80% or more of the pixels in the mark detection window. On the other hand, the shift detection section 404 determines that there is no mark I in the mark detection window when the counted number of pixels is out of the range alpha, and detects the design deviation of the tube T. [ The judging unit 405 judges the good or defective product of the tube T on the basis of the detection result of the misalignment detecting unit 404. More specifically, the judging unit 405 judges that the tube T is good when the design deviation is not detected, and judges that the tube T is defective when the design deviation is detected. The determination result output unit 406 transmits the determination result by the determination unit 405 to the sequencer 5. [

Fig. 6 is a schematic view showing an installation position of the illumination system according to the present embodiment.

In Fig. 6, the direction in which the front surface of the tube T is directed is defined forward. Further, the direction in which the back surface of the tube T faces is defined as a rear direction.

The lighting system includes an illumination unit 1, a reflection plate 2, and a camera 3. The lighting system is installed in the visual inspection unit 110 in the charger P. A tube T is disposed between the illumination unit 1 and the reflection plate 2.

The light 1 is a surface light source such as an LED (Light Emitting Diode), and the color of the light is white. The horizontal width (or vertical width) of the illumination 1 is at least larger than the horizontal width of the tube T. The vertical width (or horizontal width) of the illumination light 1 is at least larger than the vertical width of the mark I. The light 1 is installed in a limited space (for example, a depth of 35 mm to 95 mm) in the charger P. For this reason, it is preferable to use a thin (for example, about 8 mm in thickness) illumination as the illumination light 1.

The illumination unit 1 is installed at a position behind the tube T toward the front of the light emitting unit. The illuminator 1 is installed to irradiate the back surface of the tube T that flows in the reflector 2 and the charger P. Here, the illumination 1 is installed so as to irradiate the rear surface of the tube T at least including the left and right ends of the tube T located above the lower portion of the mark I at least.

The reflector 2 is a plate that reflects light. The material of the reflecting surface of the reflection plate 2 is polytetrafluoroethylene. Polytetrafluoroethylene diffuses light more than mirrors. The color of the reflection surface of the reflection plate 2 is preferably white so that the color of the reflection plate 2 is not reflected on the tube T. [

The reflection plate 2 is installed at a position ahead of the tube T toward the rear of the reflection surface so as to reflect the light irradiated from the illumination 1 around the mark I of the tube T. [ The angle of the reflecting surface of the reflection plate 2 with respect to the light irradiation direction (horizontal direction) in the light source (illumination 1) is?. The angle [theta] is from 30 degrees to 60 degrees, preferably from 40 degrees to 50 degrees, more preferably 45 degrees.

The camera 3 is a CCD (Charge Coupled Device Image Sensor) camera.

The camera 3 is installed at a position ahead of the tube T toward the rear of the optical system. The camera 3 is installed so that the front surface of the tube T flowing in the charger P can include at least the left and right ends of the mark I and the tube T. [

The height of the illumination light 1, the reflection plate 2 and the camera 3 and the angle? Of the reflection plate 2 are adjustable. Thus, the positions of the illumination unit 1, the reflection plate 2, and the camera 3 can be adjusted according to the size, shape, and design of the tube T as an inspected object.

6 shows an example of the installation positions of the illumination 1, the reflection plate 2 and the camera 3 with respect to the tube T having a height of 140 mm (sign h). The illumination 1 is installed at a position 112 mm (j) in height behind the center of the tube T by 55 mm (sign i). That is, the illumination light 1 is arranged on the back side of the tube T. The upper end of the illumination 1 is located above the tube T. The lower end of the illumination 1 is located below the mark I. The reflection plate 2 is installed at an angle? = 45 degrees at a position ahead of the light 1 by 100 mm (code k). That is, the reflection plate 2 is disposed above the tube T as the first surface side of the tube T. The reflection plate 2 is inclined with respect to the irradiation direction of the light of the illumination 1 so as to face the first surface of the tube T. The camera 3 is installed at a position in front of 65 mm (m) from the bottom of the reflector 2 as 130 mm (reference numeral 1) forward from the center of the tube T.

Each of the charging devices P is made up of two sets of tubes T. Therefore, two illumination systems may be arranged side by side, and two tubes T may be imaged at substantially the same time and inspected. In this case, the width of the illumination light 1 may be increased so that the two tubes T can be irradiated with one illumination light 1.

7 is an image picked up by the illumination system according to the present embodiment.

The illumination 1 irradiates the back surface of the tube T as shown in Fig. 7, so that the left and right ends of the tube T above the lower portion of the mark I are clearly picked up. That is, in the image captured by the camera 3 as shown in Fig. 7, the illumination 1 (that is, the light 1 from the illumination 1) is illuminated on the background of both the left and right ends of the tube T above the bottom of the mark I Direct survey light). Therefore, the right and left ends of the tube T can be detected satisfactorily. Further, since the light of the illumination light 1 is diffused by the reflection plate 2 to irradiate the mark I, it is possible to prevent the halation and to pick up the image of the mark I clearly.

Next, the processing of the image processing apparatus 4 for detecting the design deviation of the tube T from the image picked up by the above-described illumination system will be described.

8A to 8D are explanatory diagrams of the positive / negative determination processing in the image processing apparatus 4 according to the present embodiment.

First, the image input unit 401 acquires an image from the camera 3 (see Fig. 8A). Subsequently, the edge detector 402 scans from the left to the right in the inspection window W, which is a preset range, and detects the portion with the largest color change as the tube edge G (see Fig. 8B). Then, the window determination unit 403 determines the mark detection window M based on the tube edge G (see FIGS. 8C and 8D). More specifically, the window determination unit 403 sets an area on the right side of the predetermined edge of the tube edge G to the mark detection window M. [

Subsequently, the shift detection unit 404 counts the pixels of the mark color in the mark detection window M. [

The shift detection section 404 detects that there is no deviation in the design of the tube T when the counted number of pixels is within the range (alpha) (see Fig. 8C). On the other hand, the shift detection section 404 detects that the design of the tube T deviates when the counted number of pixels is out of the range alpha (Fig. 8D). Finally, the judging unit 405 judges that the tube T which is not deficient in design is a good product, and judges that the tube T deviating from the design is a defective product. For example, in the case of the tube T shown in FIG. 8C, since the mark I exists at the position of the mark detection window M, the number of pixels of the mark color is within the range?. Therefore, the image processing apparatus 4 judges that the tube T shown in Fig. 8C is good. On the other hand, in the case of the tube T shown in Fig. 8D, since the mark I does not exist at the position of the mark detection window M, the number of pixels of the mark color is " 0 " Therefore, the image processing apparatus 4 judges that the tube T shown in Fig. 8D is a defective product.

Next, with reference to Fig. 9, a description will be given of a positive / negative determination process by the image processing apparatus 3. Fig. Fig. 9 is a flow chart showing the procedure of the positive / negative determination process according to the present embodiment.

First, the edge detector 402 scans the inspection window W from the left to right in the image acquired from the camera 3, and detects the portion with the largest color change as the tube edge G (step S101). Next, the window determination unit 403 determines the mark detection window M based on the tube edge G (step S102). Subsequently, the shift detection section 404 counts the number of pixels of the mark color in the mark detection window M (step S103). Then, the misalignment detecting section 404 judges whether or not the number of pixels of the counted mark color is within the range? (The number of pixels is within the predetermined threshold value) (step S104). If the counted number of pixels is within the range alpha (step S104: Yes), the determining unit 405 determines that the tube T is good (step S105) and ends the processing. On the other hand, if the counted number of pixels is not in the range? (Step S104: No), the determining unit 405 determines that the tube T is a defective product NG (step S106) and ends the processing.

Next, the image pickup result obtained by the illumination system according to the present embodiment is compared with the image pickup result obtained when the tube T is directly irradiated.

10A to 10C show imaging results of the camera 3 in the illumination system according to the present embodiment. 10A shows an image pickup result in the case where polytetrafluoroethylene is used as the material of the reflector 2 in the arrangement of the above-described illumination system. Fig. 10B shows the result of imaging in the case where the reflector 2 is a mirror in the arrangement of the above-described illumination system. 10C shows an image pickup result when the front surface of the tube T is directly irradiated from the illumination light 1 for comparison.

As shown in Fig. 10C, when the front surface of the tube T is directly irradiated and picked up, the mark I is lost due to the generation of the halting in the end sealing portion E, and the tube edge G of the tube T, Is blurred. Therefore, when the tube T is directly irradiated, the mark I can not be detected by image processing. On the other hand, as shown in Fig. 10B, when a mirror is used for the reflection plate 2 in the illumination system, the mark I can be picked up because the halation can be suppressed as compared with the case of direct irradiation. However, since the diffuse ratio of light is lower than that of polytetrafluoroethylene in the mirror, there is a case where the color of the mark (I) is blurred or the color (for example, blue) is reflected in the mark color as shown in FIG. Therefore, when a mirror is used for the reflection plate 2, the detection rate of the mark I decreases. 10A, when the polytetrafluoroethylene is used for the reflection plate 2 in the illumination system according to the present embodiment, the marks I and the tube edges G are sharpened by preventing the halation Can be picked up. Therefore, good results were obtained when the inspection was performed on the basis of the captured image. Thus, in the case where the reflection plate 2 is made of polytetrafluoroethylene in the arrangement of the above-described illumination system, the mark I can be detected more accurately by image processing.

11 shows an experimental result of the inspection system according to the present embodiment.

In the table shown in Fig. 11, the tube quality indicates the result of determination of good or defective product by visual inspection. The tester determination indicates the determination result of the good (OK) or the defective (NG) by the inspection system. As shown in Fig. 11, the judgment result by the inspection system coincides with the judgment result by the visual inspection. As described above, the inspection system according to the present embodiment can maintain the inspection quality in the case where the inspection is performed as in the prior art.

12 is a graph showing changes in illuminance at the position of the tube T according to the present embodiment.

In this graph, the abscissa is a control value (the unit is a knob volume (Vol (Volume)) for controlling the intensity (illumination) of the light emitting the light source. The vertical axis indicates the illuminance (unit: Lux) at the position of the tube T.

A line 201 shown in Fig. 12 shows a change in illuminance when the front surface of the tube T is directly irradiated with the illumination light 1. A line 202 shows a change in illuminance when a mirror is used for the reflector 2 in the illumination system according to the present embodiment. A line 203 indicates the change in illuminance when polytetrafluoroethylene is used as the reflector in the illumination system according to the present embodiment.

As shown in Fig. 12, the illuminance of the tube T in the case of using the illumination system according to the present embodiment changes approximately linearly with respect to the control value. Therefore, the illuminance can be more finely adjusted depending on the design and shape of the tube T. On the other hand, when the front surface of the tube T is directly irradiated, the illuminance is unstable with respect to the control value and it is difficult to adjust the illuminance.

In addition, the illuminance when polytetrafluoroethylene is used for the reflector 2 is changed more gently than the case where a mirror is used for the reflector 2. This is because polytetrafluoroethylene diffuses light more than a mirror. Therefore, in the case of using the polytetrafluoroethylene as the reflector 2, the halation is less likely to occur than in the case of using a mirror.

Thus, according to the present embodiment, the tube T is irradiated with the illumination light 1 from the back surface, and the light emitted from the illumination light 1 is reflected on the front surface of the tube T in the reflection plate 2. Therefore, T) of the tube T can be imaged more clearly by preventing the halation in the covered charger P, even if there is gloss on the surface of the tube T, in order to prevent the incorporation of dust or dirt. This makes it possible to judge whether the tube T is good or defective with high precision on the production line.

The operator who performs inspection by providing the input section 6, the illumination control section 7 and the display section 8 can finely adjust the illuminance of the illumination 1 according to the design or shape of the tube T while confirming the captured image have. Further, since the light of the illumination light 1 is diffused and reflected by using the polytetrafluoroethylene as the reflector 2, the illuminance of the light reflected on the front surface of the tube T can be adjusted more finely.

A program for realizing each step shown in Fig. 9 is recorded on a computer-readable recording medium, and a program recorded on the recording medium is read into a computer system and executed to determine whether the tube T is good or defective It is also good. The " computer system " used herein may include hardware such as an OS or a peripheral device.

The term "computer-readable recording medium" refers to a storage device such as a flexible disk, a magneto-optical disk, a ROM, a nonvolatile memory such as a flash memory, a portable medium such as a CD-ROM, or a hard disk built in a computer system.

The term " computer readable recording medium " refers to a volatile memory (e.g., a dynamic random access memory (DRAM)) in a computer system serving as a server or a client when a program is transmitted through a communication line such as a network, And a program that is maintained for a predetermined period of time.

The program may be transferred from a computer system stored in a storage device or the like to another computer system via a transmission medium or a transmission wave in the transmission medium. Refers to a medium having a function of transmitting information such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.

The program may be for realizing a part of the functions described above.

The above-described functions may be realized by a combination with a program already recorded in the computer system, or a so-called differential file (differential program).

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific structure is not limited to the above, and various design changes and the like can be made within the scope not departing from the gist of the present invention.

For example, in the present embodiment, the material of the reflecting surface of the reflection plate 2 is made of polytetrafluoroethylene, but the present invention is not limited to this. Other materials such as polypropylene and polyethylene may be used for the reflector 2 if the material has a high diffusivity.

In this embodiment, the light source 1 is an LED, but the present invention is not limited to this. For example, the light source 1 may be a different light source such as a fluorescent lamp or a halogen lamp.

The present invention can be applied to an illumination system, an inspection system, and a control system.

1 light 2 reflector
3 camera 4 image processing device
5 sequencer 6 input unit
7 Lighting control unit 8 Display unit
401 Image input unit 402 Edge detection unit
403 Window determination unit 404 Dislocation detection unit
405 judgment section 406 judgment result output section
T tube (inspected object)

Claims (5)

A method for inspecting the position of a design of an object to be inspected based on a sensed image, comprising the steps of: capturing a first surface of the inspected object on which a mark is printed, As a system,
An illumination unit arranged on a back surface side of the first surface of the inspected object and having an upper end located above the inspected object and a lower end located below the inspected object,
A reflecting member which is disposed above the inspected object as the first surface side of the inspected object and which is inclined with respect to the irradiation direction of the light of the illumination so as to face the first surface of the inspected object and reflects the light from the illumination Respectively,
Wherein the illumination directly irradiates light to the back surface of the first surface of the inspected object and indirectly irradiates light to the first surface of the inspected object through the reflective member. The method according to claim 1,
Further comprising an image pickup unit disposed on the side opposite to the illumination with respect to the reflecting member to obtain an image including at least both the left and right ends of the mark and the inspected object by imaging the first surface of the inspected object . 3. The method according to claim 1 or 2,
Wherein the material of the reflecting surface of the reflecting member is polytetrafluoroethylene. An inspection system for detecting a position of a design of an object to be inspected using the illumination system according to claim 2,
A determination unit that determines a range in which the mark should be present in the image captured by the imaging unit;
And a detection unit that detects a position of the design of the inspected object based on the presence or absence of the mark in the range determined by the determination unit. A control system for determining good or defective products of an inspected object flowing through a production line using the inspection system according to claim 4,
And a control unit for determining a good or a defective product of each of the inspected objects flowing through the production line based on the detection result by the detection unit.

Images