JP2002257532A - Inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection device capable of acquiring a proper image without increasing a cost. SOLUTION: A camera 11 is disposed just above a conveyance line for passing a plastic (polyethylene terephthalate) bottle 2, and a cylinder-shaped cylindrical mirror 12 is disposed between the camera 11 and the plastic bottle 2. The inside surface 13 of the cylindrical mirror 12 projects a circumferential surface image S of a cap 3 of the plastic bottle 2 so as to be able to be imaged by the camera 11. A lens part 21 of the camera 11 is encircled by a circular ring- shaped illumination 22, and the circumferential surface 5 of the cap 3 is irradiated with light 31 from the illumination 22 through the cylindrical mirror 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection apparatus for obtaining a peripheral image of a work.

[0002]

2. Description of the Related Art Conventionally, when inspecting a PET bottle,
An inspection apparatus 101 as shown in FIG. 2 was used.

The inspection apparatus 101 is, for example, an apparatus for simultaneously inspecting the appearance of a side surface of a cap 112 of a plastic bottle 111, and includes a camera 113 disposed above the plastic bottle 111. Between the camera 113 and the PET bottle 111, a bowl-shaped, cylindrical cylindrical mirror 114 having an opening at the bottom is disposed, and the cylindrical mirror 114 converts the peripheral image of the cap 112 into the camera. The projection 113 is formed to have a larger diameter from the lower side to the upper side so that the image can be projected. A circular ring-shaped illumination 115 is provided on the cylindrical mirror 114 along the upper edge of the cylindrical mirror 114 so that the cap 112 can be irradiated with light 116.

The imaging range of the camera 113 is as follows:
The camera 113 is set so as to cover the cylindrical mirror 114, and the camera 113 is configured to obtain a peripheral image of the cap 112 via the cylindrical mirror 114.

[0005]

However, in the inspection apparatus 101, the light 11 illuminated from the illumination 115
6 and 116, on the top surface of the cap 112, most of them are reflected to the camera 113 side, while the cap 1
Most of the twelve sides are reflected obliquely downward as indicated by the broken lines in the figure. For this reason, the top surface image of the cap 112 obtained by the camera 113 has high brightness, but the peripheral image of the cap 112 has low brightness.
This makes it difficult to set the aperture.

In order to solve this problem, it is conceivable to arrange a plurality of lights 121,... On the side of the cap 112, but in this case, the cost is increased and the peripheral surface of the cap 112 is curved. Therefore, there is a problem that the illuminated light becomes weaker as the distance from the center of the illumination increases, and it is difficult to obtain a clear image.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide an inspection apparatus capable of obtaining an appropriate image without increasing costs. .

[0008]

In order to solve the above-mentioned problems, in the inspection apparatus of the present invention, a peripheral image of the work is captured by the camera between the work and a camera for imaging the work. In an inspection apparatus provided with cylindrical projection means for projecting an image, a ring-shaped illumination is provided outside the imaging range of the camera and at a position near the camera, and light from the illumination impinges the projection means. The illumination was arranged at a position where the peripheral surface of the work was irradiated through the intermediary.

That is, light from illumination provided at a position near the camera is applied to the peripheral surface of the work through a projection unit that projects a peripheral image of the work. As a result, uniform light is radiated from the surroundings onto the peripheral surface of the work. The peripheral surface of the workpiece that has received the light is projected by the camera so as to be imageable by the camera, and is imaged by the camera.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an inspection apparatus 1 according to the present embodiment. The inspection apparatus 1 is an apparatus for inspecting, for example, the appearance of a peripheral surface 5 of a cap 3 of a plastic bottle 2 as a work. The inspection apparatus 1 is installed on a transport line on which a plastic bottle 2 before shipment is transported, and is configured to be able to acquire a peripheral image S of the plastic bottle 2 passing below.

That is, a camera 11 is provided immediately above a transport line through which the plastic bottle 2 passes.
Between the camera 11 and the plastic bottle 2, there is provided a cylindrical mirror 12 as a bowl-shaped cylindrical opening means having a downward opening, and an inner surface 1 of the cylindrical mirror 12.
Numeral 3 is formed in a curved shape having a larger diameter from below to above so that the peripheral surface image S of the cap 3 can be projected by the camera 11 so as to be imageable. The cylindrical mirror 12 is not limited to a bowl shape, but may be an elliptical shape, a parabolic shape, or a cylindrical shape.

A circular ring-shaped illumination 22 is provided so as to surround the outer periphery of the lens portion 21 of the camera 11, and the illumination 22 is out of the imaging range of the camera 11, and 11 is located in the vicinity. Thereby, the illumination 22 is arranged at a position where the projected light 31 irradiates the peripheral surface 5 of the cap 3 via the cylindrical mirror 12.

The imaging range of the camera 11 is set so as to cover the cylindrical mirror 12, and the camera 11 converts the peripheral image S of the cap 3 into the cylindrical mirror 1.
2. And
The camera 11 is connected to an image analysis device (not shown), and is configured to analyze the acquired peripheral surface image S and inspect the PET bottle 2 before shipping.

In the embodiment having the above-described configuration, the cylindrical mirror 12 that projects the peripheral image S of the cap 3 by using the light 31 from the illumination 22 provided near the lens unit 21 of the camera 11 is used. By doing so, it is possible to uniformly irradiate the peripheral surface 5 of the cap 3 from the periphery thereof. Therefore, the cost can be reduced as compared with a case where a plurality of lights are arranged on the transport line of the plastic bottle 2 while avoiding the passage of the plastic bottle 2, and the curved peripheral surface 5 can be used. Even with this, a clear image with little change in luminance can be obtained. Thereby, the efficiency at the time of analysis can be improved.

The peripheral image S of the cap 3 receiving the light 31 can be projected by the cylindrical mirror 12 and imaged by the camera 11. Therefore, since the path of the light 31 from the illumination 22 to the peripheral surface 5 of the cap 3 and the path from the peripheral surface 5 of the cap 3 to the camera 11 are different, most of the projected light 31 is reflected in different directions. As compared with the related art, it is possible to obtain the peripheral image S having higher luminance. This makes it easier to set the aperture as compared to the related art in which the top surface image obtained by the camera 11 has a high luminance while the peripheral image S has a low luminance. At the same time without any problems.

Further, since the ring-shaped illumination 22 is provided close to the lens portion 21 of the camera 11,
Its outer diameter dimension can be made smaller than in the prior art. Thereby, space saving can be achieved. Further, the diameter of the illumination 22 can be reduced, and the light 31 diffused from the illumination 22 can be collected on the peripheral surface 5 of the cap 3 by the cylindrical mirror 12, thereby contributing to a reduction in power consumption. .

In the present embodiment, the case where the peripheral surface 5 of the cap 3 of the plastic bottle 2 is imaged and inspected has been described as an example, but the peripheral surface 5 of another inspection object is inspected. It may be used at the time.

[0018]

As described above, in the inspection apparatus of the present invention, the light from the illumination provided near the camera is used by projecting means for projecting the peripheral image of the work. The peripheral surface of the work can be uniformly irradiated from the periphery. Therefore, as compared with the case where a plurality of illuminations are arranged on the side of the work, the cost can be reduced, and a clear image with little change in luminance can be obtained even on a curved peripheral surface. Can be.

Further, the peripheral image of the work which has received the light can be projected by the projection means and taken by the camera. Therefore, the path of the light from the illumination to the peripheral surface of the work and the path from the peripheral surface of the work to the camera are different, so that compared to the conventional method, most of the light is reflected in different directions. Can be obtained.

Further, since the ring-shaped illumination is provided close to the camera, its outer diameter can be reduced. Thereby, space saving can be achieved. Further, while reducing the diameter of the illumination, and condensing the light diffused from the illumination onto the peripheral surface of the work by the projection means, it is possible to reduce the power consumption.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a conventional inspection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inspection apparatus 2 PET bottle (work) 5 Peripheral surface 11 Camera 12 Cylindrical mirror (projection means) 22 Illumination 31 Light S Peripheral image

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Claims (1)

[The claims] An inspection apparatus provided with a cylindrical projection means for projecting a peripheral image of the work so as to be able to be imaged by the camera, between the work and a camera for imaging the work. A ring-shaped illumination is provided at a position outside the imaging range and in the vicinity of the camera, and the illumination is arranged at a position where light from the illumination irradiates the peripheral surface of the work via the projection unit. Inspection equipment.