JPH1054807A - Apparatus for inspecting side face of mouth of bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To photograph a screen without a distortion even when a reflecting part is not concentric to a position of a bottle, by constituting the reflecting part set above the bottle of a polyhedron with an inner face as a reflecting face. SOLUTION: A reflecting part 3 set above a bottle 1 for reflecting upward light from the whole circumference of a side face 1a of a mouth of the bottle 1 is composed of an inverted pyramidal polyhedron. As inner face of the polyhedron is a reflecting face 3a. An illumination light from an illuminating part 2 penetrates the whole circumference of the mouth side face 1a, enters the reflecting part 3, is reflected at the reflecting face 3a and photographed at 4. Since the reflecting part 3 is a polyhedron, an image of the mouth side face 1a is not a single continuous ring, but images seen from faces of the polyhedron. For instance, when the reflecting face 3a comprises four faces, the image of the side face 1a is an image of four images 6a-6b seen from directions different every 90 deg. on a screen. Even when the reflecting part 3 is not concentric to a position of the bottle 1, the image is not distorted. An image-processing part 5 compares brightnesses of pixels of the images 6a-6b and judges that the bottle is defective when a difference of the brightnesses is not smaller than a fixed condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for optically inspecting the entire periphery of the mouth of a bottle.

[0002]

2. Description of the Related Art As a device for inspecting the entire periphery of the mouth of a bottle without rotating the bottle during the movement of the bottle, an illuminating unit for illuminating the entire periphery of the mouth of the bottle with illumination light, A reflecting portion provided concentrically around the mouth side and reflecting light from the mouth side upward, an imaging portion provided above the bottle concentrically with the bottle and photographing light from the mouth side, and the obtained image There is an image processing unit that detects a defect from the surface, and the reflection unit is a truncated inverted cone and the inner surface is a reflection surface.

[0003]

However, in the case of a truncated inverted conical body, the image on the side of the mouth is ring-shaped, so that there is no problem when the position of the bottle is concentric with the reflector. Otherwise, the image is distorted, making it difficult to detect defects.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has a bottle-side surface which can obtain an image without distortion even when the position of the bottle is not concentric with a reflecting portion for reflecting light from the bottle upward. It is an object of the present invention to provide an inspection device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides an illuminating unit for illuminating the entire surface of a mouth of a bottle with illumination light, and a top of the bottle surrounding the mouth concentrically with the bottle. A reflecting portion provided upward to reflect light from the entire periphery of the mouth side surface,
In the inspection apparatus for the mouth side of a bottle comprising an imaging unit provided above the bottle concentrically with the bottle and photographing light from the mouth side and an image processing unit for detecting a defect from the obtained image, the reflection unit is The polyhedron is characterized in that the inner surface of the polyhedron is a reflection surface.

According to the present invention, since the reflecting portion is a polyhedron, the image on the side of the mouth does not form a single ring.
The image is viewed from each side of the polyhedron. For example, if the number of surfaces is four, the surface is viewed almost half way from directions different by 90 °. That is, four images are arranged on one screen.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an apparatus for inspecting the mouth side of a bottle according to the present invention will be described below with reference to FIGS. FIG.
BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the whole structure of the inspection apparatus of the mouth side of a bottle of this invention. In FIG. 1, reference numeral 1 denotes a bottle, and an obliquely upper portion of the bottle 1 is provided with an annular illuminating unit 2 for allowing illumination light to enter the entire periphery of the mouth side surface 1 a.

A reflector 3 is provided above the bottle 1 so as to surround the mouth side 1a concentrically with the bottle 1 and reflects upward light from the entire periphery of the mouth side 1a. The reflecting portion 3 is formed of a truncated inverted pyramidal polyhedron, and the inner surface of the polyhedron is a reflecting surface 3a. FIG. 2 is a plan view of the reflecting portion 3 made of a polyhedron. The polyhedron shown in FIG. 2A is formed of a tetrahedron connected from an upper portion to a lower portion, and four reflecting surfaces 3a are formed on an inner surface. The polyhedron shown in FIG. 2B is formed of a tetrahedron in which only the lower end is connected, and similarly, four reflection surfaces 3a are formed on the inner surface. FIG. 2 (a) and FIG.
In (b), a tetrahedron is illustrated, but a hexahedron may be used.

Above the reflection unit 3, an imaging unit 4 which is provided concentrically with the bottle 1 and comprises a CCD camera for photographing light from the side surface 1a of the bottle 1 is provided. The imaging unit 4 is connected to the image processing unit 5 and detects a defect on the side of the mouth from the image obtained by the imaging unit 4.

Next, the operation of the apparatus for inspecting the side face of a bottle constructed as described above will be described. Illumination light from the illumination unit 2 is incident on the entire periphery of the mouth side surface 1 a of the bottle 1. Light transmitted through the entire periphery of the mouth side surface 1a is incident on the reflecting portion 3 made of a polyhedron, is reflected by the reflecting surface 3a, and the reflected light is imaged by the imaging portion 4.

Since the reflecting portion 3 is a polyhedron, the mouth side surface 1a
Is not formed into a single ring, so that it is an image viewed from each surface constituting the polyhedron. For example, as shown in FIG. 2A and FIG. 2B, when the number of the reflecting surfaces 3a is four, the reflection surface 3a is viewed almost every half circumference from directions different by 90 °. That is, as shown in FIG. 3, four images 6a,
6b, 6c, and 6d are arranged on one screen.
The image 6e at the center is an image formed by light directly entering the imaging unit 4 from the top surface. Images 6a, 6 obtained
The image processing unit 5 compares the brightness of each pixel from b, 6c, and 6d, and determines that there is a defect when the difference in brightness is equal to or more than a certain condition.

[0012]

As described above, according to the present invention, the image of the entire periphery of the mouth side of the bottle is not a single continuous ring but an intermittent image from each plane of the polyhedron. Therefore, even if the position of the reflection part and the bottle are not concentric, the image is not distorted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an overall configuration of a bottle side inspection apparatus according to the present invention.

FIG. 2 is a plan view showing a reflection portion in the inspection device for the side surface of the mouth of the bottle.

FIG. 3 is a diagram showing an image captured by an imaging unit in the inspection device for the side surface of the bottle mouth.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottle 1a Mouth side surface 2 Illumination part 3 Reflection part 3a Reflection surface 4 Imaging part 5 Image processing part 6a-6e Image

Claims (1)

[Claims] 1. An illumination section for injecting illumination light all around the mouth side of a bottle, and a reflection provided at an upper part of the bottle so as to surround the mouth side concentrically with the bottle and reflecting light from the entire periphery of the mouth side upward. Department and
In a bottle side inspection apparatus, comprising: an imaging unit provided above the bottle concentrically with the bottle and capturing light from the side of the mouth; and an image processing unit for detecting a defect from the obtained image, the reflection unit includes: An inspection device for a bottle side surface, wherein the polyhedron has an inner surface which is a reflection surface.