WO2018079955A1

WO2018079955A1 - Vision inspection device

Info

Publication number: WO2018079955A1
Application number: PCT/KR2017/003745
Authority: WO
Inventors: 이창희; 박상필; 최길영
Original assignee: (주) 진코퍼레이션
Priority date: 2016-10-26
Filing date: 2017-04-05
Publication date: 2018-05-03
Also published as: KR101717730B1; JP2020503528A

Abstract

The present invention relates to a vision inspection device, comprising: a case having a transmission window on one surface thereof so as to transmit the light of illumination towards an object to be recognized; a camera module for photographing the object to be recognized located outside of the transmission window; an LED illumination module provided at one side of the case and irradiating light to the object to be recognized through the transmission window; a half mirror provided inside the case and refracting the light, which is irradiated from the LED illumination module, towards the side of the object to be recognized; a primary diffusion plate provided between the LED illumination module and the half mirror and diffusing the scattered light irradiated from the LED illumination module; and a second diffusion plate provided on an inner wall of the case and diffusing the scattered light passed through the primary diffusion plate and the scattered light having passed through the half mirror or reflected at the half mirror.

Description

Vision inspection device

The present invention relates to a vision inspection apparatus for photographing and inspecting a product or barcode attached to the product or OCR characters.

At various stages of the production site and distribution, a vision inspection device that recognizes / inspects barcodes, OCR characters, product shapes, etc., and reflects the inspection results in each process and distribution stage, is widely used in various industries. In the production and distribution stages, the vision package was generally smoothly printed by using a vision inspection device applied with a conventional technology by printing a target object or attaching a separate label directly to the outer packaging material of the product.

However, when the outside of the product is packaged in a transparent or translucent packaging such as vinyl, such as some medicines, since the light of the light is reflected on the packaging, the desired image cannot be obtained with the camera. Accordingly, in order to obtain a high quality image of the object to be recognized, it is necessary to adjust the installation position, angle, brightness, and the like of the lighting. However, even in such a case, it is difficult to obtain uniform illuminance in the entire area of the object to be recognized, and there is a problem that the lighting needs to be adjusted again even with slight environmental changes.

In addition, in order to obtain a high quality image of the object to be recognized, a worker may work to photograph the object to be recognized by bringing the packaging material of the product into close contact with the contents. Automatic or semi-automatic inspection was not possible because it was unknown in advance.

To solve this problem, some companies are using a method of obtaining a desired image by printing a photoreactive paint on the object to be recognized and irradiating ultraviolet or infrared rays from the outside to cause the object to be self-illuminated in the visible light band in the packaging material. However, these inspection methods are also burdened with separate equipment and ongoing printing costs.

In addition, in order to solve the above-mentioned problem, some companies use a dome-type diffuse lighting device, but such a dome-shaped diffuse lighting device typically has a square or rectangular shaped target area. Since a very large and heavy lighting device having a hemispherical shape having a diagonal length of the area to be recognized must be used, it unnecessarily occupies a large area and has many limitations in installation.

Prior Art Document 1: Patent Publication No. 10-1514409

Prior Art Document 2: Korean Patent Publication No. 10-1346335

An object of the present invention is to provide a vision inspection apparatus that can obtain a good image by minimizing the reflection by the packaging material when illuminating the object to be recognized wrapped in a packaging material having a high reflectance, such as vinyl.

In order to achieve the above object, the present invention provides a case having a transmission window on one surface to transmit the light of illumination to the object to be recognized; A camera module for photographing an object to be recognized located outside the transmission window; An LED lighting module installed at one side of the case and irradiating light to the object to be recognized through the transmission window; A half mirror installed inside the case and refracting light emitted from the LED lighting module toward the object to be recognized; A first diffusion plate disposed between the LED lighting module and the half mirror and configured to diffuse scattered light emitted from the LED lighting module; And a secondary diffuser plate disposed on an inner wall of the case and configured to secondarily diffuse scattered light passing through the primary diffuser plate and scattered light passed through the half mirror or reflected from the half mirror. .

Preferably, the case has a hexahedron shape, the LED lighting module receiving block is accommodated on one surface adjacent to the transmission window, the light irradiated from the LED lighting module is refracted by the half mirror And is transmitted to the transmission window.

Here, the LED lighting module accommodating block is partitioned into a plurality of accommodating spaces by a plurality of partition walls arranged in parallel with each other, the LED lighting module is divided into a plurality of accommodating in the respective accommodating spaces in a sliding manner, a plurality of LED lighting modules are characterized in that the brightness is adjusted individually.

Preferably, the LED lighting module receiving block is composed of an aluminum frame, characterized in that the silicon heat dissipation pad is installed between the LED lighting module and the aluminum frame.

On the other hand, the camera module is installed in the camera module receiving block protruding outward from one surface of the case facing the transmission window, the camera module is installed so that the optical axis is perpendicular to the transmission window, the camera module Inside the receiving block is characterized in that the total reflection mirror is installed so that the optical axis of the camera module is turned 90 degrees toward the transmission window.

According to the present invention, the light reflected toward the camera module can be minimized by minimizing the light reflected in the direction perpendicular to the transmission window among the light reflected from the object to be recognized. As a result, the camera module photographs the object to be recognized to obtain an image of good quality, and thus, the camera module can accurately recognize and inspect the object to be recognized.

1 is a perspective view showing a vision inspection apparatus according to the present invention,

Figure 2 is a side view showing a vision inspection device according to the present invention,

3 is a plan view showing a vision inspection apparatus according to the present invention,

Figure 4 is a perspective view showing the inside of the vision inspection device by cutting the vision inspection device according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the vision inspection apparatus according to the present invention.

1 to 4, the vision inspection apparatus according to the present invention, the case 100 of the hexahedral shape, the camera module 200 provided in the rear of the case 100, the LED light provided in the upper portion of the case 100 The module 300, the half mirror 400 that refracts the light irradiated from the LED lighting module 300, the primary diffuser plate 500 and the primary diffuser plate which diffuse the light emitted from the LED lighting module 300 ( And a second diffuser plate 600 for diffusing the scattered light diffused through 500.

The case 100 is a hexahedron-shaped member having a transmission window 110 on its front surface. On the outside of the transmission window 110 of the case 100, a transport conveyor (not shown) for transporting a drug to be recognized, for example, wrapped in a plastic packaging material, is disposed, and the light of the LED lighting module 300 to be described later is transmitted. The object to be recognized is irradiated through the window 110.

The camera module 200 includes a camera 210 and a lens 220, and photographs an object to be recognized located outside the transmission window 110. In this case, the case 100 includes a camera module accommodating block 101 protruding rearward at a position facing the rear surface 120, that is, the front face provided with the transmission window 110, and the camera module accommodating block 101 is provided. The camera module 200 is accommodated therein.

The LED lighting module 300 is light for irradiating the object to be recognized, and the light emitted from the LED lighting module 300 passes through the transmission window 110 to illuminate the object to be recognized. Here, the case 100 includes an LED lighting module accommodating block 102 protruding upward on the side of the upper surface 130 adjacent to the front surface provided with the transmission window 110, and the LED lighting module accommodating block 102 includes: The LED lighting module 300 is installed, and the LED lighting module 300 irradiates light downward toward the case 100.

The half mirror 400 is installed inside the case 100 and transmits about 1/2 of the incident light and reflects the rest. The half mirror 400 is installed obliquely inside the case 100 so that the light irradiated from the LED lighting module 300 is refracted toward the transmission window 110 and the light reaches the object to be recognized.

The primary diffuser plate 500 is installed between the LED lighting module 300 and the half mirror 400. Specifically, the primary diffusion plate 500 is formed of an acrylic light transmitting material, and is installed side by side with the upper surface 130 of the case 100. The primary diffuser plate 500 serves to primaryly diffuse the light emitted from the LED lighting module 300 to generate scattered light. The light scattered through the primary diffuser plate 500 is refracted by the half mirror 400 and transmitted to the outside of the case 100 through the transmission window 110.

The secondary diffusion plate 600 is installed on the inner wall of the case 100. Specifically, the secondary diffusion plate 600 is a case 100 except for the front surface of the case 100 is provided with a transmission window 110 and the upper surface 130 of the case 100 in which the LED lighting module 300 is installed. It is installed on the left and right sides, bottom and back of the inside. The secondary diffusion plates 600 may be formed of a material having high reflectance, for example, a fluorine resin (PTFE), a double brightness enhancement film (DBEF), and a high brightness liquid crystal composite (CLC) film. In addition, the scattered light generated through the primary diffuser plate 500 is diffused in various directions by the secondary diffuser plate 600 and irradiated outside the case 100 through the transmission window 110.

With this configuration, a part of the light emitted from the LED lighting module 300 is scattered by the primary diffuser plate 500, and some of the scattered light scattered by the primary diffuser plate 500 is directly transmitted through the window 110. Toward the transmissive window 110 by being reflected by the half mirror 400 to the transmissive window 110 or by secondary diffuser plates 600 installed on the inner wall of the case 100. Is headed. In addition, the light passing through the half mirror 400 among the scattered light scattered by the primary diffuser plate 110 is also scattered by the secondary diffuser plates 600 to transmit the transmission window 110 through the half mirror 400. You will be directed to.

As such, in the vision inspection apparatus according to the present invention, light generated from the LED lighting module 300 is scattered in numerous directions by the primary diffuser plate 500, the half mirror 400, and the secondary diffuser plate 600. Accordingly, the light passing through the transmission window 110 is transmitted through the direction perpendicular to the transmission window 110 at a predetermined angle to reach the object to be recognized. Therefore, the light reflected toward the camera module 200 may be minimized by minimizing the light reflected in the vertical direction from the light reflected from the object to be recognized. As a result, the camera module 300 may capture an object to be recognized to obtain an image of good quality. Therefore, the vision inspection apparatus according to the present invention enables accurate recognition and inspection of the object to be recognized.

Preferably, the LED lighting module receiving block 102 is partitioned into a plurality of receiving spaces by a plurality of partitions 103 arranged side by side. In addition, the LED lighting module 300 is divided into a plurality of pieces are inserted and received in a sliding manner in each accommodation space. Therefore, the LED lighting module 300 can be easily replaced.

Moreover, the plurality of LED elements provided in each LED lighting module 300 is arranged in a grid pattern of appropriate intervals. And, each LED lighting module 300 is configured to be individually adjustable brightness. By the LED lighting module 300, it is possible to provide uniform illuminance to the entire object to be recognized.

In addition, the LED lighting module receiving block 102 is composed of an aluminum frame exposed to the outside of the case 100, a silicon heat dissipation pad (not shown) is provided between the LED lighting module 300 and the aluminum frame. Accordingly, heat generated from the LED lighting module 300 can be quickly transferred to the aluminum frame side through the silicon heat radiation pad.

Meanwhile, the camera module 200 is installed in the camera module accommodating block 101 protruding outward from the rear surface 120 of the case 100 facing the transmission window 110. The camera module 200 is provided with a lens 220 facing downward so that the optical axis is perpendicular to the transmission window 110. In addition, a total reflection mirror 230 is installed below the camera module 200, and the total reflection mirror 230 serves to direct the optical axis of the camera module 200 to 90 degrees to face the transmission window 110. do.

By the arrangement of the camera module 200, the size of the camera module accommodating block 101 protruding toward the rear side of the case 100 may be minimized, thereby reducing the overall size of the vision inspection apparatus.

Claims

A case provided with a transmission window on one surface to transmit light of illumination to the object to be recognized;

A camera module for photographing an object to be recognized located outside the transmission window;

An LED lighting module installed at one side of the case and irradiating light to the object to be recognized through the transmission window;

A half mirror installed inside the case and refracting light emitted from the LED lighting module toward the object to be recognized;

A first diffusion plate disposed between the LED lighting module and the half mirror and configured to diffuse scattered light emitted from the LED lighting module; And

A secondary diffuser plate disposed on an inner wall of the case and including a secondary diffuser plate for secondarily diffusing scattered light passing through the primary diffuser plate and scattered light passing through the half mirror or reflected from the half mirror; Inspection device.
The method of claim 1,

The case has a hexahedron shape and has an LED lighting module accommodating block in which the LED lighting module is accommodated on one surface adjacent to the transmitting window, and the light irradiated from the LED lighting module is refracted by the half mirror to transmit the transmitting window. Vision inspection apparatus, characterized in that transmitted through.
The method of claim 2,

The LED lighting module accommodating block is partitioned into a plurality of accommodating spaces by a plurality of partition walls arranged in parallel with each other, the LED lighting module is divided into a plurality and accommodated in the respective accommodating spaces in a sliding manner, and a plurality of LED lights Vision inspection apparatus, characterized in that the modules are individually controlled brightness.
The method according to claim 2 or 3,

The LED lighting module accommodating block is composed of an aluminum frame, the vision inspection device, characterized in that a silicon heat dissipation pad is installed between the LED lighting module and the aluminum frame.
The method of claim 2,

The camera module is installed in the camera module receiving block protruding outward from one surface of the case facing the transmission window, the camera module is installed so that the optical axis is perpendicular to the transmission window, the camera module receiving block In the interior of the vision inspection device, characterized in that the total reflection mirror is installed so that the optical axis of the camera module is turned 90 degrees toward the transmission window.