JP3020089U - Light source device for product inspection - Google Patents

Abstract

(57) [Abstract] [Purpose] An image processing device for determining the quality of various characters formed on the front surface of a bottle container cap by printing or the like and the quality of a backing member provided on the back surface of the cap. Provided is a light source device for product inspection, which is useful for inspecting with higher accuracy by using. [Structure] The light source device for product inspection according to the present invention uses the image processing device to inspect the quality of the character formed on the front surface of the cap for the bottle container by using the front surface of the cap in a dark place. A light source device for illuminating a product, comprising a substrate having an opening for imaging, and a plurality of light emitting diodes radially arranged below the opening, wherein the light emitting diode has a tip in plan view. Is arranged so as to face inward, and at the time of inspection, the character portion formed on the front surface of the cap or the portion surrounding the character is made blacker than other portions and illuminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is provided with the quality of various characters, figures, and patterns (hereinafter collectively referred to as characters) formed by a method such as printing on the front surface of the cap for a bottle container and the back surface of the cap. The light source device for product inspection used when inspecting the quality of the backing member that has been installed, and particularly when the quality of the above is inspected using an image processing device, the front or back surface of the cap is in a dark place. The present invention relates to a light source device for product inspection for illuminating with light.

[0002]

[Prior art]

 Conventionally, various characters have been formed by printing or the like on the surface of the cap of a bottle container that holds soft drinks, alcohols, foods such as jams, and the like. These characters are mainly drawn or framed by red, green, or blue colors. For example, when the cap material is aluminum, a desired character is often drawn on the substrate. In addition, when the cap material is steel, the base material is once printed on a plain white color, and the desired character is often drawn mainly on this with a red, green or blue color. . If the cap material is steel, the desired character is printed in white on the solid base, which is mainly reddish, greenish, or bluish, and as a result, the character concerned is printed. May be bordered by red, green or bluish colors.

By the way, when the cap having the desired character formed on the surface is actually attached to the bottle container, the character is good or bad, that is, whether there is color unevenness, scratches, dust adhesion, printing misalignment, etc. in the character. It is necessary to inspect in advance and remove the cap on which a bad character is formed. Conventionally, the above-mentioned inspection was liable to human visual perception, but recently, it has become faster to perform it using a machine.

In general, a machine is used to inspect whether a character is good or bad, and an image of an object to be inspected is picked up in a constant light environment to obtain image pickup data. Based on the image pickup data, an image processing apparatus outputs image processing data. After the acquisition, the image processing data is compared with the image processing data of a non-defective product recorded in advance. Then, the object to be inspected for which the image processing data that deviates from the image processing data of the non-defective product by a predetermined reference value or more is obtained is regarded as a defective product, and is excluded by an appropriate means. The image data of the object to be inspected necessary for this inspection is generally obtained by illuminating the object to be inspected by a fluorescent lamp or a halogen lamp in a dark place, and imaging the object to be inspected under this condition for a monochrome image (for example, CCD camera ).

Further, a backing member for packing or the like is provided on the back surface of the cap for the bottle container, but recently, the quality of the backing member, that is, dirt, adhesion of dust, loss of the backing member, etc. As for the presence / absence, they have come to be inspected by machines in the same way as the above-mentioned inspection of characters.

[0006]

[Problems to be solved by the device]

 When an object to be inspected is illuminated by a fluorescent lamp or a halogen lamp in a dark place and the object to be inspected under this condition is imaged by an image pickup device (for example, a CCD camera) for black and white images, recent image pickup devices have high sensitivity. Therefore, it is often possible to obtain imaging data by sensing even the flicker that inevitably occurs in fluorescent lamps and halogen lamps. Further, when the inspection object is illuminated by a fluorescent lamp or a halogen lamp in a dark place, even a slight unevenness on the surface of the inspection object tends to cause a large diffuse reflection. Therefore, when the above-mentioned inspection is performed using an image processing device based on the imaging data obtained under the condition that the inspection object is illuminated by a fluorescent lamp or a halogen lamp in the dark, it is originally a non-defective product. The inspection accuracy is lowered as a result of the inspected object that should be judged as being often judged as defective.

A first object of the present invention is to more accurately inspect the quality of various characters formed on the front surface of a cap for a bottle container by a method such as printing by using an image processing device. Another object of the present invention is to provide a useful light source device for product inspection.

A second object of the present invention is a product inspection, which is useful for inspecting the quality of the backing member provided on the back surface of the cap for bottle containers with higher accuracy using an image processing apparatus. It is to provide a light source device for inspection.

[0009]

[Means for Solving the Problems]

 The light source device for product inspection according to the present invention, which achieves the above-mentioned first object, is provided with a table of the cap when the quality of the character formed on the front surface of the cap for the bottle container is inspected by using the image processing device. A light source device for inspecting a product in a dark place, comprising: a substrate having an opening for imaging; and a plurality of light emitting diodes radially arranged below the opening. Is placed with the tip facing inward in plan view, and at the time of inspection, illuminates the character part formed on the front surface of the cap or the part surrounding the character by turning it blacker than other parts. The light source device is hereinafter referred to as the light source device I.

Further, the light source device for product inspection of the present invention which achieves the above second object is used when the quality of the backing member provided on the back surface of the cap for the bottle container is inspected by using the image processing device. A light source device for inspecting a product, which illuminates the back surface of the cap in a dark place, comprising: a substrate having an opening for imaging; a green light emitting diode radially arranged below the opening; and the green light emitting diode. A red light-emitting diode closely arranged in a radial pattern, and the green light-emitting diode and the red light-emitting diode are arranged with their optical axes horizontal, and the tip is arranged inward in plan view, At the time of inspection, the defective portion existing on the backing member is made blacker than other portions and illuminated, or a shadow caused by the presence of the defective portion is generated. Hereinafter, this light source device is referred to as a light source device II).

Hereinafter, the present invention will be described in detail. First, the light source device I of the present invention will be described. The light source device I includes, as described above, a substrate having an opening for imaging, and a plurality of light emitting diodes radially arranged below the opening. The light emitting diode is arranged with its tip facing inward in plan view.

Here, the “substrate having an opening for imaging” as referred to in the present invention means (1) a flat plate (single plate or plywood) having a desired shape in the central portion or in the vicinity thereof in the thickness direction of the flat plate. A form in which a penetrating imaging opening is provided, or (2) a recess for radially disposing the light-emitting diodes described later in or near the center of a flat plate (single plate or plywood) of the desired shape. And an opening for imaging that penetrates in the thickness direction of the bottom is provided at or near the center of the bottom of the recess.

The outline shape of the substrate in plan view is not particularly limited, but a circular shape is preferable. Also, if necessary, a connection part for connecting the light emitting diode described below to an external power source, and an engaging part for allowing the light emitting diode described below to be arranged at a predetermined position by an appropriate supporting member at the time of inspection. May be provided on the substrate. This substrate is placed horizontally during inspection.

The imaging opening provided on the substrate is for defining the imaging range of the imaging device. The horizontal cross-sectional shape of the opening is not particularly limited, but normally, it may be a circle having a diameter larger than the diameter of the tip of the lens (optical section) of the imaging device. The image pickup device is arranged such that the optical axis of the lens (optical unit) is oriented in the vertical direction, and at the time of inspection, images the object to be inspected arranged below the opening from the opening side.

In the light source device I, a plurality of light emitting diodes are radially arranged below the opening. And these light emitting diodes are arrange | positioned so that a front end may face inward in planar view. Here, the term “below the image capturing opening” used in the present invention is defined as “above the image capturing opening” on the side where the lens (optical section) of the image capturing apparatus is arranged during actual inspection. Means below when.

The light emitting diodes may be arranged radially in one stage, or may be divided into two or more stages and arranged in a radial manner. Whether to dispose in one step radially or to dispose in two or more steps respectively in a radial direction can be appropriately selected depending on the intended use of the light source device, the light emitting characteristics of the light emitting diode to be used, and the like. When the light emitting diodes are radially arranged, each light emitting diode may be directly fixed to the above-mentioned substrate, or may be supported by another member other than the substrate.

In the light source device I, the reason for arranging the light emitting diodes radially so that the tips thereof face the inner side in plan view is to illuminate the front surface of the inspected object as evenly as possible. is there. Here, the “tip of the light emitting diode” in the present invention means the tip of the light emitting surface. It is desirable that each light emitting diode is radially arranged with its tip directed to one point, but it may be radially arranged toward one point with some variation. In each case where the light emitting diodes are arranged in a radial pattern with the tip end facing one point, and when the light emitting diodes are arranged in a radial pattern with the tip end facing substantially one point with some variation, In the invention, the above-mentioned one point is called “center of the light emitting diodes radially arranged”.

When the light along the optical axis of the light emitting diode hits the front surface of the cap, a bright spot is generated, and when the bright spot is imaged, the inspection accuracy is lowered. Further, when this bright spot occurs, it becomes difficult to illuminate the character portion formed on the front surface of the cap or the portion surrounding the character by making it blacker than other portions. Therefore, each light-emitting diode has its optical axis set to be horizontal or its optical axis is set in the horizontal direction so that the light off the optical axis can illuminate the front surface of the inspected cap. It is preferable to arrange it so that it faces downward by an angle. When arranging the light-emitting diode so that the optical axis faces downward by a predetermined angle from the horizontal direction, the above-mentioned angle is the maximum diameter of the cap to be inspected or the distance between the light source device and the front surface of the cap at the time of inspection. It is appropriately selected according to the above. The "optical axis" of the light emitting diode referred to in the present invention means the optical axis of the lens that constitutes the light emitting diode, and the thickness direction of the above-mentioned substrate having an opening for imaging is the vertical direction. When the optical axis is in a direction orthogonal to the vertical direction, or in a direction substantially orthogonal to the vertical direction, the optical axis is horizontal.

The light source device I including the substrate and the light emitting diode described above illuminates the character portion formed on the front surface of the cap or the portion surrounding the character by making it blacker than other portions during inspection. . Whether or not the character portion formed on the front surface of the cap or the portion surrounding the character is illuminated with a blacker color than the other portions during inspection depends on the color of the portion and the emission color of the light source device. Therefore, in the light source device I of the present invention, the type of the light emitting diode is designed so that the character portion formed on the front surface of the cap or the portion surrounding the character is illuminated in a darker color than other portions during inspection. Is appropriately selected according to the type of character to be inspected.

For example, when the character to be inspected is one that is drawn or framed in a bluish or greenish color, the above light emitting diodes include a plurality of green light emitting diodes radially arranged. , Using a plurality of red light-emitting diodes radially arranged close to the green light-emitting diode, and illuminance when only the green light-emitting diode and the red light-emitting diode are all illuminated. -60 lux, the illuminance when only the red light emitting diodes are all turned on is 350 to 500 lux, and the illuminance when all the green light emitting diodes and the red light emitting diodes are all turned on is 390 to 560 lux. (Hereinafter, the light source device I configured as described above is referred to as “light source”). Device IA ".).

Here, the above-mentioned illuminance when only all the green light-emitting diodes are turned on and the above-mentioned illuminance when all the green light-emitting diodes and the red light-emitting diodes are all turned on mean the illuminance measured under the following conditions. . That is, the light source device I is arranged horizontally with the side provided with the light emitting diodes facing down, and under this state, at a point 30 mm apart vertically downward from the center of the radially arranged green light emitting diodes. It means the measured illuminance. Further, the above illuminance when only the red light emitting diodes are all turned on means the illuminance measured under the following conditions. That is, the light source device I is arranged horizontally with the side on which the light emitting diode is provided facing down, and under this state, at a point 22 mm below the center of the red light emitting diodes radially arranged vertically below the center. It means the measured illuminance.

The green light emitting diode and the red light emitting diode may be arranged with their optical axes horizontal, or may be arranged with their optical axes inclined downward by a predetermined angle from the horizontal direction. In order to prevent the occurrence of bright spots on the front surface of the cap during inspection and to obtain the desired illuminance, both the green and red light emitting diodes should have their optical axes oriented 0 to 30 ° downward from the horizontal direction. It is preferable to arrange them.

As the above-mentioned green light emitting diode constituting the light source device IA, one having a peak emission wavelength within a range of 500 to 570 nm can be used, and as a red light emitting diode, a peak emission wavelength within a range of 620 to 700 nm. You can use the one inside. Among these light emitting diodes, it is particularly preferable to combine a green light emitting diode having a peak emission wavelength of 560 nm and a red light emitting diode having a peak emission wavelength of 660 nm to satisfy the above illuminance conditions. In order to satisfy the above illuminance condition by combining a green light emitting diode having a peak emission wavelength of 560 nm and a red light emitting diode having a peak emission wavelength of 660 nm, the green light emitting diode manufactured by Stanley Electric Co., Ltd. is used as the green light emitting diode. HPG5066X (part number) is particularly preferable, and BR5374 (part number) manufactured by Stanley Electric Co., Ltd. or KR5005S (part number) manufactured by the same is particularly preferable as the red light emitting diode.

The arrangement specifications of the green light emitting diodes to satisfy the above illuminance condition when only the green light emitting diodes are all lit are as follows: The diameter varies depending on whether the light source device IA is used for inspecting a cap having a maximum diameter. For example, the green light emitting diode is HP G5066X (product number) manufactured by Stanley Electric Co., Ltd., and the cap diameter of the bottle container to be inspected (before mounting on the bottle container) is 60.5 mm or less. In this case, it is preferable that 30 to 60 of the above HPG5066X (product number) are radially arranged so that the diameter of the circle in contact with the tip of each light emitting diode is 100 to 120 mm.

In addition, the specification of the arrangement of the red light emitting diode for satisfying the above illuminance condition when only the red light emitting diode is all turned on is as follows. It will change depending on the diameter of the radial arrangement. For example, the red light emitting diode is BR5374 (product number) or KR5005S (product number) manufactured by Stanley Electric Co., Ltd., and the maximum size of the cap for the bottle container to be inspected (before being attached to the bottle container) Is less than 60.5 mm, the diameter of the circle in contact with the tip of each light emitting diode is 100 to 150 mm with 30 to 60 pieces of BR5374 (product number) or KR5005S (product number) described above. It is preferable to arrange them radially.

Either the green light emitting diode or the red light emitting diode may be positioned vertically upward, but from the standpoint of satisfying the above illuminance condition when all the green light emitting diode and the red light emitting diode are turned on, , When only the red light emitting diodes are turned on vertically below the green light emitting diodes that are radially arranged so as to achieve the illuminance condition when all the green light emitting diodes are turned on. It is preferable to radially arrange the red light emitting diodes so as to achieve the illuminance condition. At this time, the vertical distance between the center of the green light emitting diodes radially arranged and the center of the red light emitting diode radially arranged vertically below the green light emitting diode is approximately 7 to 9 mm. .

In each of the case where the green light emitting diode is arranged vertically above the red light emitting diode and the case where it is arranged vertically below the red light emitting diode, each of the green light emitting diode and each of the red light emitting diode is It is preferable that they are arranged so as to be alternately located in a plan view. Further, it is preferable that the light emitting diode in the upper stage is disposed so as to protrude inward in plan view with respect to the light emitting diode in the lower stage.

The front surface of the cap for a bottle container in which a character drawn or framed in blue or green is formed on the front surface from a predetermined distance by the above-mentioned light source device IA. When illuminated in a dark place, the bluish or greenish parts appear blacker than other parts. The distance between the light source device IA and the front surface of the cap at this time is approximately 30 to 60 mm, which is a vertical distance between the center of the radially arranged green light emitting diodes and the front surface of the cap as the inspection object. Is.

Since the bluish color part or the greenish color part looks blacker than other parts and the flicker of the light emitting diode itself is extremely small, it is possible to draw or draw a bluish color or a green color on the front surface. When the above-mentioned light source device IA is used as the light source device for inspecting the front surface of the cap for the bottle container on which the bordered character is formed, the quality of the character described above is determined by the image processing device, especially the black and white. It becomes possible to accurately grasp the shape of the character when inspecting using the image processing apparatus for images, and as a result, it becomes easy to inspect the quality of the character with high accuracy. The cap diameter of the cap that can suitably use this light source device IA as a light source device for product inspection is approximately 120 mm or less.

On the other hand, when the character to be inspected is drawn or framed in a reddish color, the above light emitting diodes are arranged radially and vertically in a plurality of stages. It is preferable to use the plurality of green light emitting diodes and to configure the light source device I so that the illuminance when all the green light emitting diodes are turned on is 150 to 370 lux (hereinafter, configured as described above). The light source device I is referred to as "light source device IB").

Here, the above-mentioned illuminance when only the green light emitting diodes are all lit means the illuminance measured under the following conditions. That is, the light source device IB is arranged horizontally with the side provided with the light emitting diode facing downward, and in this state, it is separated from the center of the lowermost green light emitting diode arranged radially in the vertical direction by 30 mm. It means the illuminance measured at the point.

The light source device IB satisfying the above illuminance condition is usually obtained by arranging the green light emitting diodes radially and vertically in two or three stages. You may arrange | position in steps. When arranging the green light emitting diodes radially and in two stages in the vertical direction, the optical axis of each of the green light emitting diodes in the first stage should be oriented 0 to 10 ° downward from the horizontal direction. In addition, the optical axis of each of the second-stage green light-emitting diodes below the first-stage green light-emitting diode shall be placed 0 to 15 ° downward from the horizontal direction. Is preferred. In this case, the vertical distance between the center of the radially arranged first green light emitting diodes and the center of the radially arranged second green light emitting diodes shall be approximately 0 to 10 mm. Preferably.

Further, when the green light emitting diodes are arranged radially and divided into three stages in the vertical direction, the optical axis of each of the first stage green light emitting diodes is from the horizontal direction. The optical axis of each of the second-stage green light-emitting diodes installed below the first-stage green light-emitting diode is oriented 0 to 20 ° downward, and its optical axis is oriented 0 to 15 ° downward from the horizontal direction. It is preferable to arrange the third-stage green light-emitting diodes provided below the second-stage green light-emitting diodes so that their optical axes are oriented 0 to 12 ° downward from the horizontal direction. In this case, the vertical distance between the center of the first-stage green light emitting diodes radially arranged and the center of the second-stage green light emitting diodes radially arranged, and the radial distance It is preferable that the vertical distance between the center of the second stage green light emitting diode and the center of the radially arranged third stage green light emitting diode are both approximately 0 to 10 mm.

As the green light emitting diode, one having a peak emission wavelength in the range of 500 to 570 nm can be used, but the above illuminance condition should be satisfied by using a green light emitting diode having a peak emission wavelength of 560 nm. Is particularly preferable. From the standpoint of satisfying the above illuminance conditions by using a green light emitting diode having a peak emission wavelength of 560 nm, HPG 5066X (product number) manufactured by Stanley Electric Co., Ltd. is particularly preferable as the green light emitting diode.

The specifications for arranging the green light emitting diodes in each stage include, in addition to the light emitting characteristics of the green light emitting diodes to be used, how large the diameters of the green light emitting diodes are radially arranged, in other words, what is the maximum value. It varies depending on whether the light source device IB is used to inspect a cap having a diameter. For example, the green light emitting diode is the above-mentioned HPG5066X (product number) manufactured by Stanley Electric Co., Ltd., and the cap diameter of the bottle container to be inspected (before mounting on the bottle container) is 60.5 mm or less. In this case, for each stage, 30 to 60 of the above HPG5066X (product number) are set in the horizontal direction so that the diameter of the circle contacting the tips of these light emitting diodes is 100 to 150 mm. It is preferable to arrange them in a radial pattern with the angle facing downward.

It is preferable that the green light emitting diodes of two adjacent stages are arranged so as to be alternately located in a plan view. Further, it is preferable that the green light emitting diode in the upper stage is arranged so as to protrude inward in plan view with respect to the green light emitting diode in the lower stage.

When the front surface of the cap for a bottle container in which the front surface has a character drawn or colored in reddish color is illuminated by the above-mentioned light source device IB in a dark place from a predetermined distance. , The reddish part looks blacker than other parts. At this time, the distance between the light source device IB and the front surface of the cap is the vertical distance between the center of the bottommost green light emitting diode radially arranged and the front surface of the cap as the inspection object. It is approximately 10 to 50 mm.

Since the reddish color portion looks blacker than other portions and the flicker of the light emitting diode itself is extremely small, a character drawn or framed in a reddish color is formed on the front surface. When the above-mentioned light source device IB is used as the light source device for inspecting the front surface of the cap for the bottle container, the image quality of the character is determined by using the image processing device, especially the image processing device for monochrome image. It becomes possible to accurately grasp the shape of the character at the time of inspection, and as a result, it becomes easy to inspect the quality of the character with high accuracy. The light source device IB can be preferably used as a light source device for product inspection, and the cap diameter of the cap is approximately 120 mm or less.

Next, the light source device II of the present invention will be described. As described above, the light source device II of the present invention illuminates the back surface of the cap for bottle containers in the dark when the quality of the backing member provided on the back surface is inspected by using the image processing apparatus. The light source device II includes a substrate having an opening for imaging, a green light emitting diode radially arranged below the opening, and a radial light emitting diode close to the green light emitting diode. And the red light emitting diode is arranged in a horizontal direction, and the green light emitting diode and the red light emitting diode are both arranged such that their optical axes are horizontal and their tips are directed inward in plan view. The light source device II may be any device capable of producing a shadow caused by a defective portion existing on the backing member provided on the back surface of the cap at the time of inspection. In the light source device IA, the respective light emitting diodes are the same as the light emitting diodes arranged with their optical axes horizontal, and therefore the description thereof is omitted here.

The light source device II is the same as the light source device IA of the present invention described above in which each light emitting diode is arranged with its optical axis horizontal. can do. That is, the illuminance when only the green light emitting diodes are all turned on is 40 to 60 lux, the illuminance when only the red light emitting diodes are all turned on is 350 to 500 lux, and the green light emitting diode and the red light emitting diodes are all turned on. An illuminance of 390 to 560 lux can be used.

Either of the green light emitting diode and the red light emitting diode may be positioned vertically upward, but from the standpoint of satisfying the above illuminance condition when all of the green light emitting diode and the red light emitting diode are turned on, , When only the red light emitting diodes are turned on vertically below the green light emitting diodes that are radially arranged so as to achieve the illuminance condition when all the green light emitting diodes are turned on. It is preferable to radially arrange the red light emitting diodes so as to achieve the illuminance condition. At this time, the vertical distance between the center of the green light emitting diodes radially arranged and the center of the red light emitting diode radially arranged vertically below the green light emitting diode is approximately 7 to 9 mm. .

In each of the case where the green light emitting diode is arranged vertically above the red light emitting diode and the case where it is arranged vertically below the red light emitting diode, each of the green light emitting diode and each of the red light emitting diode is It is preferable that they are arranged so as to be alternately located in a plan view. Further, it is preferable that the light emitting diode in the upper stage is disposed so as to protrude inward in plan view with respect to the light emitting diode in the lower stage.

When the back surface of the bottle container cap having the backing member provided on the back surface is illuminated in the dark from a predetermined distance by the above-mentioned light source device II, stains and dust adhere to the backing member. When there is a defective portion such as a defect, the defective portion is blackened and illuminated compared to other portions, and when there is a defective portion such as a defect, a shadow is generated due to the existence of the defective portion. These defective portions or their shadows can be easily caught by the image processing device. At this time, the distance between the light source device II and the back surface of the cap is about 30 to 60 mm, which is a vertical distance between the center of the lowermost light emitting diodes radially arranged and the back surface of the cap as the inspection object.

Since the defective portion existing in the backing member or its shadow is easily caught by the image processing apparatus and the flicker of the light emitting diode itself is extremely small, the backing member is provided on the back surface. When the above-mentioned light source device II is used as the light source device for inspecting the back surface of the cap for the bottle container, the quality of the backing member is checked by an image processing device, especially an image processing device for black and white images. At the time of inspection, it becomes possible to accurately grasp the presence or absence of a defective portion in the backing member, and as a result, it becomes easy to inspect the quality of the backing member with high accuracy. The light source device II can be preferably used as a light source device for product inspection, and the cap diameter of the cap is approximately 120 mm or less.

[0045]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is a bottom view of an example of a light source device for product inspection (corresponding to the light source device IA and the light source device II) according to the present invention, and FIG. 2 is a light source device for product inspection shown in FIG. FIG. 3 is a diagram for explaining a mounting state of a green light emitting diode and a red light emitting diode in FIG. The light source device 1 shown in FIGS. 1 and 2 includes a substrate 3 having an opening 2 for imaging, a plurality of green light emitting diodes 10 radially arranged below the opening 2 for imaging, and the green color. A plurality of red light emitting diodes 20 are arranged radially below the light emitting diode in the vertical direction.

The substrate 3 is composed of three substrates 3a, 3b and 3c, and the overall shape thereof is a green light emitting diode 10 and a red light emitting diode at the center of a flat plate having a circular shape with a diameter of 170 mm in plan view. Recesses 4 for radially arranging the diodes 20 are provided, and an opening 2 for imaging that penetrates in the thickness direction of the central portion is provided in the central portion of the substrate 3a which is the bottom of the concave portion 4. ing. The horizontal cross-sectional shape of the opening 2 is circular, and its diameter is 80 mm. Further, on the outer peripheral surface of the substrate 3, groove-shaped engaging portions 5 are provided all around for the convenience of connecting each green light emitting diode 10 and each red light emitting diode 20 to an external power source. There is.

Each green light emitting diode 10 is arranged on the substrate 3 in a state of being sandwiched between the substrate 3a and the substrate 3b so that the free end of each lead portion 10a reaches the outside, and these green light emitting diodes 10 are emitted. The diode 10 is composed of HPG5066X (product number) manufactured by Stanley Electric Co., Ltd., which has a peak emission wavelength of 560 nm. The total number of the green light emitting diodes 10 is 30, and these green light emitting diodes 10 have their tips 10b directed inward in plan view, and the circles in contact with the tips 10b are equidistantly spaced so as to have a diameter of 105 mm. Are arranged radially. As a result, the inner peripheral surface of the substrate 3 in the portion where the opening 2 is provided projects more inward than any of the green light emitting diodes 10 in plan view. Further, each green light emitting diode 10 is provided such that its optical axis (shown by a chain line L ₁ in FIG. 2) is horizontal. The centers of these green light emitting diodes 10 arranged radially are point P ₁ in FIGS. 1 and 2, and this point P ₁ is 7.5 mm vertically below the center P ₀ of the opening 2. In the distance. It should be noted that the symbol L ₀ in FIG. 2 indicates a vertical line passing through the center P ₀ of the opening 2.

On the other hand, the red light emitting diode 20 is provided on the substrate 3 in a state of being sandwiched between the substrate 3b and the substrate 3c so that the free ends of the respective lead portions 20a reach the outside, and these red light emitting diodes 20 are provided. The red light emitting diode 20 is composed of BR5374 (product number) manufactured by Stanley Electric Co., Ltd., which has a peak emission wavelength of 660 nm. The total number of red light emitting diodes 20 is 30, and these red light emitting diodes 20 have their tips 20b directed inward in plan view, and the circles in contact with the tips 20b are equidistantly spaced so that their diameters are 115 mm. Are arranged radially. As a result, each of the green light emitting diodes 10 described above projects more inward than any of the red light emitting diodes 20 in plan view. Further, the red light emitting diodes 20 are arranged so as to be positioned alternately with the green light emitting diode 10 when seen in a plan view. Each red light emitting diode 20 is provided such that its optical axis (indicated by a chain line L ₂ in FIG. 2) is horizontal, and the centers of these red light emitting diodes 20 arranged radially are This is the point P ₂ in FIGS. 1 and 2. This point P ₂ is located 8 mm below the center P ₁ of the radially arranged green light emitting diodes 10 in the vertical direction.

In the light source device 1 configured as described above, the illuminance when only the green light emitting diodes 10 are all turned on is about 50 lux, and the illuminance when only the red light emitting diodes 20 are all turned on is about 450 lux. The illuminance when the green light emitting diode 10 and the red light emitting diode 20 are all turned on is about 500 lux.

It should be noted that the illuminance when only the green light emitting diodes 10 are all turned on and the illumination when all the green light emitting diodes 10 and the red light emitting diodes 20 are all turned on are with the side provided with the light emitting diodes facing down. 1 is arranged horizontally, and under this condition, it is a value measured at a point 30 mm below the point P _{1 in} the vertically downward direction. Further, the illuminance when only the red light emitting diodes 20 are all turned on is such that the light source device 1 is arranged horizontally with the side provided with the light emitting diodes facing down, and under this condition, the vertical direction from the point P _{2 described above.} It is a value measured at a point 22 mm below.

The light source device 1 described above is provided on the back surface of the cap or the quality of the character drawn or outlined in blue or green on the front surface of the bottle container cap having a maximum diameter of 18 to 100 mm. It is suitable as a light source device for illuminating the front surface or the back surface of the cap in a dark place when inspecting the quality of the backing member thus obtained by using an image processing device, particularly an image processing device for black and white images.

The inspection using the above light source device 1 is performed as follows, for example. That is, as schematically shown in FIG. 3, the above-mentioned light source is connected with the lead portion 10a of each green light emitting diode 10 and the lead portion 20a of each red light emitting diode 20 connected to an external power source (not shown). The device 1 is horizontally arranged in a dark place by a support member (not shown), and a cap 26 as an inspection object is intermittently conveyed below the device 1 by a transfer means 25 such as a turntable connected to a conveyor. . The distance between the light source device 1 and the cap 26 at the time of image pickup is from the point P ₁ in the light source device 1 to the front surface (when inspecting a character) or the back surface (when inspecting the backing member) of the cap 26. The vertical distance D to) is kept within the range of 30 to 60 mm. Further, the cap 26 at the time of imaging is arranged inside the ring of the green light emitting diodes 10 radially arranged in the light source device 1 so as to be located in a plan view.

On the other hand, the tip of the lens (optical part) 28 of the image pickup device 27 such as a CCD camera is arranged vertically above the opening 2 of the light source device 1 arranged horizontally. At this time, the optical axis of the lens (optical section) 28 is oriented in the vertical direction. Then, the cap 26 is imaged in a dark place in a state where all the green light emitting diodes 10 and all the red light emitting diodes 20 are turned on.

Using the above light source device 1 as a light source device for inspection, a CCD camera for capturing a monochrome image and an image processing device were used to examine the inspection accuracy in the following manner. First, 15 good non-defective aluminum caps with a maximum diameter of 60.5 mm, which have a predetermined character printed in blue on the front side, and intentionally stain the character part of the non-defective product with a white paint marker of 3 mmφ. Five defective products prepared in step 1 were prepared, and these were mixed and subjected to inspection (hereinafter, this inspection is referred to as "inspection I").

In addition, 15 good aluminum caps with predetermined characters printed in green on the front surface and 3mmφ stains were intentionally attached to the character parts of the good products with white paint markers. Five prepared defective products were prepared, and these were mixed and subjected to inspection (hereinafter, this inspection is referred to as “inspection II”).

Further, 15 non-defective aluminum caps provided with a backing member (made of polyvinyl chloride) for packing on the back surface and 2 mmφ and 0.8 mm depth intentionally in the backing member part of the non-defective product. Five defective products prepared by providing the defective portion were prepared, and these were mixed and subjected to inspection (hereinafter, this inspection is referred to as "inspection III").

In addition, 15 non-defective aluminum caps provided with a backing member for packing (the material is polyvinyl chloride) on the back surface, and the backing member part of the non-defective product is intentionally 1 mmφ with black oil-based magic. We prepared 5 defective products that were manufactured by adding the stains, and mixed and submitted them for inspection (hereinafter, this inspection is called "inspection IV").

As a result, in each of the inspections I to IV, the false positive rate in which a good product was erroneously recognized as a defective product and the false positive rate in which a defective product was erroneously recognized as a good product were both 0%. Could be inspected. In both of the above-mentioned inspection I and inspection II, the character portion was turned blacker than the other portions and illuminated. In addition, during the above-mentioned inspection III, the defective portion (dirt portion) was turned blacker than other portions and illuminated. Then, at the time of the above-mentioned inspection IV, a shadow was generated due to the presence of the defective portion (defective portion), and this shadow was captured by the CCD camera.

Embodiment 2 FIG. 4 is a bottom view of an example of a light source device for product inspection (corresponding to the light source device IB) according to the present invention, and FIG. 5 shows the light source device for product inspection shown in FIG. It is a figure for demonstrating the attachment state of the green light emitting diode of the 1st step, and the green light emitting diode of the 2nd step. The light source device 31 shown in FIGS. 4 and 5 includes a substrate 33 having an opening 32 for imaging, and a plurality of first-stage green light-emitting elements radially arranged below the opening 32 for imaging. The photodiode 40 and the plurality of second-stage green light-emitting diodes 50 radially arranged below the first-stage plurality of green light-emitting diodes 40 are provided.

The substrate 33 is made of a single plate, and the overall shape thereof is such that the first-stage green light-emitting diodes 40 are radially arranged in the central portion of a flat plate having a circular shape with a diameter of 160 mm in plan view. A concave portion 34 is provided for this purpose, and an opening 32 for imaging that penetrates in the thickness direction of the bottom portion is provided in the central portion of the bottom portion of the concave portion 34. The horizontal cross-sectional shape of the opening 32 is circular, and its diameter is 90 mm. In addition, on the main surface of the substrate 33 on the side of the opening 32, a groove-shaped member is provided for the convenience of connecting the green light emitting diodes 40 and 50 of the first and second stages to an external power source. The joint portion 35 is provided in an annular shape.

In the green light emitting diodes 40 and 50 of the first and second stages, the free ends of the lead portions 40 a and 50 a penetrate the groove-shaped engaging portion 35 of the substrate 33 in the thickness direction thereof. Each of these green light emitting diodes 40 and 50 is composed of HPG5 066X (product number) manufactured by Stanley Electric Co., Ltd. having a peak emission wavelength of 560 nm. The total number of the green light emitting diodes 40 and 50 in the first and second stages is 60, respectively.

The respective green light emitting diodes 40 of the first stage are arranged radially with their tips 40b directed inward in plan view and at equal intervals so that the diameter of the circle in contact with the tips 40b is 103 mm. Has been done. As a result, the inner peripheral surface of the substrate 33 in the portion where the opening 32 is provided projects more inward than any of the green light emitting diodes 40 in plan view. Further, each green light emitting diode 40 is provided so that its optical axis (shown by a chain line L ₁₁ in FIG. 5) is downward by 8 ° from the horizontal direction. The center of the first-stage green light emitting diodes 40 arranged radially is a point P ₁₁ in FIGS. 4 and 5, and the point P ₁₁ is vertically below the center P ₁₀ of the opening 32. It is at a distance of 18 mm. The reference symbol L ₁₀ in FIG. 5 indicates a vertical line passing through the center P ₁₀ of the opening 32.

On the other hand, the respective green light emitting diodes 50 of the second stage have their tips 50b directed inward in plan view, and are radially arranged at equal intervals so that the diameter of the circle in contact with the tips 50b is 124 mm. It is set up. As a result, each green light emitting diode 40 in the first stage projects inward in plan view more than any of the green light emitting diodes 50 in the second stage. Further, the second-stage green light emitting diodes 50 are arranged so as to be positioned alternately with the first-stage green light emitting diodes 40 when viewed in a plan view. Each green light emitting diode 50 in the second stage is provided such that its optical axis (shown by the alternate long and short dash line L ₁₂ in FIG. 5) is oriented downward by 15 ° from the horizontal direction, and these green light emitting diodes 50 are arranged radially. The center of the red light emitting diode 50 is the point P ₁₂ in FIGS. 4 and 5. The point P ₁₂ is 12 mm vertically below the center P ₁₁ of the green light emitting diodes 40 arranged radially.

In the light source device 31 configured as described above, the illuminance when only the first-stage green light-emitting diode 40 is fully illuminated is about 110 lux, and only the second-stage green light-emitting diode 50 is illuminated. The illuminance when all the LEDs are turned on is about 110 lux, and the illuminance when all the first-stage green light emitting diodes 40 and the second-stage green light emitting diodes 50 are each illuminated is about 220 lux.

It should be noted that, in addition to the illuminance arrangement when only the first-stage green light-emitting diodes 40 are all lit, when the first-stage green light-emitting diodes 40 and the second-stage green light-emitting diodes 50 are all lit, The illuminance is a value obtained by arranging the light source device 31 horizontally with the side on which the light emitting diode is provided facing down, and under this condition, at a point 30 mm away vertically from the point P _{11 in} the vertical direction. Further, the illuminance when only the second-stage green light emitting diode 50 is turned on is such that the light source device 31 is arranged horizontally with the side provided with the light emitting diode facing down. It is a value measured at a point 18 mm below _{12 in} the vertical direction.

The above-mentioned light source device 31 is an image processing device, especially an image processing device for black-and-white images, which is used to determine the quality of a character drawn or framed in a reddish color on the surface of the bottle container cap having a maximum diameter of 18 to 100 mm. It is suitable as a light source device for illuminating the front surface of the cap in a dark place when inspecting using the device.

The inspection using the light source device 31 is performed in the same manner as the inspection using the light source device 1 of the first embodiment, for example. However, the distance between the light source device 31 and the cap that is the object to be inspected at this time is such that the vertical distance from the point P ₁₁ in the light source device 31 to the front surface of the cap is within a range of 10 to 50 mm. Kept in.

Using the above-mentioned light source device 31 as a light source device for inspection, a CCD camera for capturing a monochrome image and an image processing device were used to examine the inspection accuracy in the following manner. That is, 15 good non-defective aluminum caps with a maximum diameter of 60.5 mm that have a predetermined character printed in red on the front surface, and the character part of the non-defective product is intentionally stained with 3 mmφ with white paint markers. Five defective products produced by this were prepared, and these were mixed and used for inspection. As a result, both the false positive rate in which a good product was mistakenly recognized as a defective product and the false positive rate in which a defective product was falsely recognized as a good product were both 0%, and highly accurate inspection was possible. At the time of the above inspection, the character part was illuminated with a blacker color than the other parts.

Embodiment 3 FIG. 6 is a bottom view of another example of a light source device for product inspection (corresponding to the light source device IB) according to the present invention, and FIG. 7 is a light source device for product inspection shown in FIG. FIG. 6 is a diagram for explaining a mounting state of the first-stage green light-emitting diode, the second-stage green light-emitting diode, and the third-stage green light-emitting diode in FIG. The light source device 61 shown in FIGS. 6 and 7 includes a substrate 63 having an imaging opening 62 and a plurality of first-stage green light-emitting elements radially arranged below the imaging opening 62. The photodiode 70, the plurality of second-stage green light-emitting diodes 80 radially arranged vertically below the first-stage plurality of green light-emitting diodes 70, and the plurality of second-stage green light-emitting diodes 80. The plurality of green light emitting diodes 90 of the third stage arranged radially below the diode 80 in the vertical direction.

The substrate 63 is made of a single plate, and the overall shape thereof is such that the first-stage green light-emitting diodes 70 are radially arranged in the central portion of a flat plate having a circular shape with a diameter of 180 mm in plan view. A concave portion 64 is provided for this purpose, and an opening 62 for imaging that penetrates in the thickness direction of the bottom portion is provided in the central portion of the bottom portion of the concave portion 64. The horizontal cross-sectional shape of the opening 62 is circular, and its diameter is 90 mm. Further, on the main surface of the substrate 63 on the opening 62 side, a groove-shaped engaging portion 65 is provided in an annular shape for the convenience of connecting the green light emitting diodes 70, 80 and 90 to an external power source. There is.

In the green light emitting diodes 70, 80, 90 of the first to third stages, the free ends of the lead portions 70 a, 80 a, 90 a are provided with the groove-shaped engaging portions 65 of the substrate 63. Of the green light emitting diodes 70, 80, 90 of the first to third stages, each having a peak emission wavelength of 560 nm, manufactured by Stanley Electric Co., Ltd. It consists of HPG5066X (product number). The total number of the green light emitting diodes 70 in the first to third stages is 60.

The green LEDs 70 of the first stage are arranged radially with their tips 70b facing inward in plan view and at equal intervals so that the diameter of the circle in contact with the tips 70b is 100 mm. Has been done. As a result, the inner peripheral surface of the substrate 63 at the portion where the opening 62 is provided projects more inward than any of the green light emitting diodes 70 in plan view. Further, each green light emitting diode 70 is provided so that its optical axis (shown by a chain line L ₂₁ in FIG. 5) is oriented downward by 19 ° from the horizontal direction. The center of the first-stage green light emitting diodes 70 radially arranged is a point P ₂₁ in FIGS. 6 and 7, and the point P ₂₁ is 27 mm vertically below the center P ₂₀ of the opening 62. In the distance. It should be noted that reference numeral L ₂₀ in FIG. 7 indicates a vertical line passing through the center P ₂₀ of the opening 62.

On the other hand, the respective green light emitting diodes 80 of the second stage have their tips 80b directed inward in plan view, and are radially arranged at equal intervals so that the diameter of the circle in contact with the tips 80b is 120 mm. It is set up. As a result, each of the green light emitting diodes 70 of the first stage projects more inward in plan view than any of the green light emitting diodes 80 of the second stage. Further, the second-stage green light-emitting diodes 80 are arranged so as to be positioned alternately with the first-stage green light-emitting diodes 70 when seen in a plan view. Each green light emitting diode 80 of the second stage is provided such that its optical axis (shown by the alternate long and short dash line L ₂₂ in FIG. 5) is oriented downward by 15 ° from the horizontal direction, and these green light emitting diodes are arranged radially. The center of the red light emitting diode 80 is the point P ₂₂ in FIGS. 6 and 7. The point P ₂₂ is located 3 mm below the center P ₂₁ of the radially arranged first-stage green light emitting diodes 70 in the vertical direction.

Each green light emitting diode 90 in the third stage has its tips 90b directed inward in plan view, and is radially arranged at equal intervals so that the diameter of the circle in contact with the tips 90b is 140 mm. Has been done. As a result, the green light emitting diodes 80 of the second stage project inward in plan view more than any of the green light emitting diodes 90 of the third stage. Further, the green light emitting diodes 90 of the third stage are arranged so as to be positioned alternately with the green light emitting diodes 80 of the second stage when seen in a plan view. The green light emitting diodes 90 of the third stage are provided such that their optical axes (shown by the one-dot chain line L ₂₃ in FIG. 7) are oriented downward by 11.5 ° from the horizontal direction, and are arranged radially. The center of these red light emitting diodes 90 is the point P ₂₃ in FIGS. 6 and 7. This point P ₂₃ is located 3 mm vertically below the center P ₂₂ of the second-stage green light emitting diodes 70 radially arranged.

In the light source device 61 configured as described above, the illuminance when only the first-stage green light-emitting diode 70 is entirely turned on is about 100 lux, and only the second-stage green light-emitting diode 80 is illuminated. The illuminance when all lights up is about 110 lux, the illuminance when only all the third stage green light emitting diodes 90 are about 120 lux, and the first to third stage green light emitting diodes 70, 80 , 90 are all illuminated, the illuminance is about 330 lux.

The illuminance when only the first-stage green light-emitting diodes 70 are all lit, the illuminance when all the second-stage green light-emitting diodes 80 are all lit, and the third-stage green light-emitting diode The illuminance when only 90 is turned on and the illuminance when all of the first to third stage green light emitting diodes 70, 80, 90 are turned on are with the side provided with the light emitting diode facing down. The light source device 61 is arranged horizontally, and in this state, the value is measured at a point 30 mm away from the point P _{23 in} the vertical downward direction.

The above-described light source device 61 is an image processing device, especially an image processing device for black-and-white images, which determines whether a character drawn or framed in a reddish color on the front surface of the bottle container cap having a maximum diameter of 18 to 100 mm is good or bad. It is suitable as a light source device for illuminating the front surface of the cap in a dark place when inspecting using the device.

The inspection using the light source device 61 described above is performed in the same manner as the inspection using the light source device 1 of the first embodiment, for example. However, the distance between the light source device 61 and the cap that is the object to be inspected at this time is such that the vertical distance from the point P ₃₃ in the light source device 61 to the front surface of the cap is within a range of 10 to 50 mm. Kept in.

The above-mentioned light source device 61 was used as a light source device for inspection, and a CCD camera for capturing a monochrome image and an image processing device were used to examine the inspection accuracy in the following manner. That is, 15 good non-defective aluminum caps with a maximum diameter of 60.5 mm that have a predetermined character printed in red on the front surface, and the character part of the non-defective product is intentionally stained with 3 mmφ with white paint markers. Five defective products produced by this were prepared, and these were mixed and used for inspection. As a result, both the false positive rate in which a good product was mistakenly recognized as a defective product and the false positive rate in which a defective product was falsely recognized as a good product were both 0%, and highly accurate inspection was possible. At the time of the above inspection, the character part was illuminated with a blacker color than the other parts.

[0080]

[Effect of device]

 As described above, by using the inspection light source device of the present invention, the quality of various characters formed by a method such as printing on the front surface of the cap for the bottle container and the back surface of the cap can be provided. The quality of the backing member can be inspected with higher accuracy using an image processing device.

[Brief description of drawings]

FIG. 1 is a bottom view of an example of a light source device for product inspection (corresponding to a light source device IA and a light source device II) of the present invention.

FIG. 2 is a diagram for explaining a mounting state of a green light emitting diode and a red light emitting diode in the light source device for product inspection shown in FIG.

3 is a diagram for explaining an example of product inspection using the light source device for product inspection shown in FIG.

FIG. 4 is a bottom view of an example of a light source device for product inspection (corresponding to the light source device IB) of the present invention.

5 is a first diagram of the light source device for product inspection shown in FIG.
It is a figure for demonstrating the attachment state of the green light emitting diode of the 2nd step, and the green light emitting diode of the 2nd step.

FIG. 6 is a bottom view of another example of the light source device for product inspection (corresponding to the light source device IB) of the present invention.

7 is a first diagram of the light source device for product inspection shown in FIG.
It is a figure for demonstrating the attachment state of the green light emitting diode of the 2nd step, the green light emitting diode of the 2nd step, and the green light emitting diode of the 3rd step.

[Explanation of symbols]

1 light source device for product inspection (equivalent to light source device IA and light source device II) 2 opening for imaging 3 substrate 10 green light emitting diode 10b tip of green light emitting diode 20 red light emitting diode 20b tip of red light emitting diode P ₁ radial Center of green light emitting diode arranged in P ₂ Center of green light emitting diode radially arranged 31 Light source device for product inspection (corresponding to light source device IB) 32 Imaging opening 33 Substrate 40 First stage Green LED 40b of the first stage Green LED of the first stage 50 Green LED 50 of the second stage 50b Green LED of the second stage P ₁₁ Radial green of the first stage center 61 product inspection light source device of the second stage of the green light emitting diode disposed at the center P ₁₂ radial light emitting diodes (light source 62) Opening for image pickup 63 Substrate 70 First stage green light emitting diode 70b Tip of first stage green light emitting diode 80 Second stage green light emitting diode 80b Second stage disposed at the center P ₂₂ radial green light emitting diodes of the tip 90 the third stage of the green light emitting diode 90b third stage the green light-emitting diode tip P ₂₁ first stage green light emitting diode disposed radially The center of the second-stage green light-emitting diode P ₂₃ The center of the third-stage green light-emitting diode radially arranged

Claims (14)

[Scope of utility model registration request] 1. A light source device for product inspection, which illuminates the front surface of the cap in a dark place when the quality of a character formed on the front surface of a bottle container cap is inspected by using an image processing device, The product inspection light source device includes a substrate having an opening for imaging, and a plurality of light emitting diodes radially arranged below the opening, and the light emitting diode has a tip inside when viewed from above. The light source device for product inspection, characterized in that the character portion formed on the front surface of the cap or the portion surrounding the character is made blacker than other portions and illuminated at the time of inspection. 2. A plurality of light emitting diodes arranged below an imaging opening, a plurality of green light emitting diodes radially arranged, and a plurality of light emitting diodes radially arranged close to the green light emitting diodes. It is composed of a red light emitting diode, the illuminance when all the green light emitting diodes are all turned on is 40 to 60 lux, the illuminance when all the red light emitting diodes are all turned on, 350 to 500 lux, the green light emitting diode and the red light. The illuminance when all the light emitting diodes are turned on is 390 to 560 lux, and when the quality of the character drawn or framed in blue or green on the front surface of the cap is inspected using an image processing device. The light source device according to claim 1, wherein the light source device is used for illuminating the front surface of the cap in a dark place. 3. The light source device according to claim 2, wherein the green light-emitting diode and the red light-emitting diode are respectively arranged with their optical axes facing downward from the horizontal direction by 0 to 30 °. 4. The light source device according to claim 2, wherein the green light emitting diode has a peak emission wavelength of 560 nm, and the red light emitting diode has a peak emission wavelength of 660 nm. 5. At the time of inspection, the green light emitting diodes are arranged so that the vertical distance between the center of the radially arranged green light emitting diodes and the front surface of the cap is 30 to 60 mm.
The light source device according to claim 4. 6. A light emitting diode arranged below an opening for imaging comprises a plurality of green light emitting diodes arranged radially and vertically in a plurality of stages. The illuminance when all the light emitting diodes are turned on is 150 to 370 lux, and when the quality of a character drawn or framed in a reddish color on the front surface of the cap is inspected by using an image processing device, the cap surface is displayed. The light source device according to claim 1, wherein the light source device is used for illuminating a surface in a dark place. 7. The green light emitting diodes are radial and
It is arranged in two stages in the vertical direction, and each of the green LEDs of the first stage has its optical axis from 0 to 10 from the horizontal direction.
Downward, and below the first-stage green light-emitting diodes, the second-stage green light-emitting diodes are respectively arranged with their optical axes oriented 0 to 15 ° downward from the horizontal direction. The light source device according to claim 6. 8. The green light emitting diodes are radial and
It is arranged in three stages in the vertical direction, and each of the first-stage green light emitting diodes has an optical axis from 0 to 20 from the horizontal direction.
Downward, and below the first-stage green light-emitting diode, each of the second-stage green light-emitting diodes has its optical axis oriented 0 to 15 ° downward from the horizontal direction, and the second-stage green light-emitting diode is lowered. 7. The light source device according to claim 6, wherein each of the third-stage green light emitting diodes is arranged below the diode with the optical axis thereof facing downward by 0 to 12 ° from the horizontal direction. 9. The light source device according to claim 6, wherein the peak light emission wavelength of the green light emitting diode is 560 nm. 10. At the time of inspection, the green light emitting diodes at the bottom of the radial arrangement are arranged such that the vertical distance between the center and the front surface of the cap is 10 to 50 mm.
The light source device according to any one of claims 6 to 9. 11. A light source device for product inspection, which illuminates the back surface of the cap in the dark when the quality of a backing member provided on the back surface of a bottle container cap is inspected by using an image processing apparatus. The inspection light source device includes a substrate having an opening for imaging, a green light emitting diode radially arranged below the opening, and a red light emitting diode radially arranged close to the green light emitting diode. Both of the green light emitting diode and the red light emitting diode are arranged with their optical axes horizontal, and their tips are directed inward in plan view. The light source device for product inspection, wherein the light source device is made blacker than the part to illuminate, or causes a shadow due to the presence of the defective part. 12. The illuminance when only the green light emitting diodes are all turned on is 40 to 60 lux, and the illuminance when only the red light emitting diodes are all turned on is 350 to 500 lux. The green light emitting diode and the red light emitting diode are respectively illuminated. Illuminance when all lights are 390-56
The light source device according to claim 11, wherein the light source device has 0 lux. 13. The peak emission wavelength of a green light emitting diode is 560 nm, and the peak emission wavelength of a red light emitting diode is 660 nm.
The light source device according to. 14. The inspection device is arranged such that a vertical distance between a center of the green light emitting diodes radially arranged and a back surface of the cap is 30 to 60 mm at the time of inspection.
~ The light source device according to claim 13.