KR20140099136A - Vision inspection apparatus comprising light part of plural line - Google Patents

Abstract

A vision inspecting apparatus photographs an assembled or mounted object to be inspected and compares the photographed image with a previously inputted object image, in order to determine whether the quality of the object is good or bad, in a component assembly process. The vision inspecting apparatus comprises a stage unit which fixates or transfers an object to be inspected in an inspection position; a lighting unit which is positioned in the upper part of the stage unit in order to provide lighting for the object; a camera unit which is positioned in the center of the lighting unit in order to obtain a two-dimensional (2D) image of the object; a grid pattern radiating unit which is placed at a side of the camera unit; a vision processing unit which reads the image photographed by the camera unit in order to determine whether the quality of the object is good or bad; and a control unit which controls the stage unit, the grid pattern radiating unit, and the camera unit. The lighting unit includes lighting members placed in multiple rows along the height direction of the vision inspecting apparatus.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vision inspection apparatus including a plurality of rows of illumination members,

The present invention relates to a vision inspection apparatus, and more particularly, to a vision inspection apparatus that includes illumination members of different colors arranged in a plurality of rows along a height direction of a vision inspection apparatus, The present invention relates to a vision inspection apparatus having a plurality of rows of illumination members configured to enable reliable height measurement.

In general, Surface Mounting Technology (SMT) for assembling surface mount components on a printed circuit board (PCB) is a technology for miniaturizing / integrating Surface Mounting Device (SMD) Development of precise assembly equipment for precise assembly, and techniques for operating various assembly equipment.

Typically, the surface mount line consists of equipment such as surface mount and vision inspection devices.

The surface mount device is a device for mounting a surface mount component on a printed circuit board. Various surface mount components supplied in the form of a tape, a stick, and a tray are supplied from a component feeder, And then putting it on the mounting position on the circuit board.

The vision inspection apparatus inspects the mounting state of the surface mounted component before or after the soldering process of the surface mounted component is completed, and transfers the printed circuit board to the next process according to the inspection result.

A typical vision inspection method is a method in which when an object to be inspected is horizontally conveyed through a conveyor, an initial position is adjusted in a position adjuster, and after the adjustment is completed, light is irradiated onto a LED component or a printed circuit board through a grating, By analyzing the shape of the shadow formed on the surface of the object to be inspected, the three-dimensional height is measured.

Thereafter, the photographed portion is calculated and compared with the reference value to check the quality / defect of the component mounting associated with the height, or to check whether the surface mounted component is mounted.

All of the above inspection methods measure a two-dimensional shadow shape and calculate a three-dimensional height by using a trigonometric function.

Therefore, it is very important for the vision inspection apparatus using the structured light that the shadow pattern formed by the irradiated light is clearly photographed.

However, when the light from the grid pattern irradiating unit for irradiating the grid pattern light is reflected by the surface of the object to be inspected, when an amount of regular reflection is generated, an excessively large amount of light is incident through the camera, Can not be obtained.

In the case where a clear image can not be obtained as described above, it may be a limit to accurately determine a fine pattern or a three-dimensional shape of a small component.

The present invention provides a vision inspection apparatus including a plurality of rows of illumination members capable of improving the reliability of height measurement by analyzing the height only in a region excluding a region where the grid pattern irradiation light is specularly reflected at the time of measuring the height of the small component will be.

According to an aspect of the present invention, there is provided an apparatus for inspecting vision, comprising: a camera for photographing an object to be inspected assembled or mounted in a process of assembling a part, comparing a photographed image with a target image inputted in advance, An illumination unit that is disposed at an upper portion of the stage and that provides illumination to the object to be inspected; and an illumination unit that is positioned at the center of the illumination unit and that is located at an upper side of the stage unit, A vision processing unit for reading the image photographed by the camera unit and discriminating the good or bad of the inspected object, and a projection unit for projecting the two- And a control unit for controlling the grid pattern irradiating unit and the camera unit, Lighting unit is characterized by including the illumination member arranged in a plurality of rows along the height direction of the vision inspection device.

Preferably, the illumination unit includes a red illumination member, a green illumination member, and a blue illumination member arranged in the height direction of the vision inspection apparatus.

The illumination members may be ring lights arranged annularly inside the housing of the vision inspection apparatus.

Preferably, the ring illumination arranged at a higher position in the illumination section is constituted by ring illumination of a smaller diameter.

Here, the height of the object to be inspected is calculated only by the region other than the region where the light is regularly reflected by the grid pattern irradiating portion.

Preferably, the region where the light is regularly reflected by the grating pattern irradiating portion is determined as the light irradiation angle by the grating pattern irradiating portion, and the region other than the light irradiation region by the illumination member having the same light irradiation angle as the grating pattern irradiating portion Is used to calculate the height of the object to be inspected.

According to the present invention, the reliability of the height measurement can be improved by analyzing the height only in a region excluding the region where the grid-pattern irradiated light is specularly reflected at the time of measuring the height of the object to be inspected.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a configuration diagram of a vision inspection apparatus including a plurality of rows of illumination members according to the present invention,
2 is a perspective view showing a state in which light is illuminated on a part to be inspected.

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

Prior to this, the terms used in the specification and claims should not be construed in a dictionary sense, and the inventor may, on the principle that the concept of a term can be properly defined in order to explain its invention in the best way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Therefore, the embodiments shown in the present specification and the drawings are only exemplary embodiments of the present invention, and not all of the technical ideas of the present invention are presented. Therefore, various equivalents It should be understood that water and variations may exist.

Fig. 1 is a configuration diagram of a vision inspection apparatus including a plurality of rows of illumination members according to the present invention, and Fig. 2 is a perspective view showing a state in which light is illuminated on a part to be inspected.

1 and 2, the vision inspection apparatus according to the present invention is a vision inspection apparatus according to the present invention, which photographs an object to be inspected assembled or mounted in a process of assembling parts, compares the photographed image with a target image inputted in advance, (10) for fixing or transferring the object to be inspected (15) to an inspection position, and a control unit (14) which is positioned above the stage unit (10) A camera unit 20 positioned at the center of the illumination unit 40 to acquire a two-dimensional shape of the object to be inspected, and a grid pattern inspection unit 20 disposed at a side of the camera unit 20. The illumination unit 40, A vision processor 50 for reading the image photographed by the camera unit 20 and discriminating the good or bad of the object to be inspected 15 and a control unit for controlling the stage unit 10 and the grid pattern irradiating unit 30) and the camera The illumination unit 40 includes illumination members 42, 44, and 46 arranged in a plurality of rows along the height direction of the vision inspection apparatus, do.

The vision inspection apparatus according to the present invention is installed so as to perform vision inspection before being transferred to a next process through a conveyor of a preceding equipment when inspecting a surface mounted component of a printed circuit board finished in a surface mounting line.

Such a vision inspection device may be installed in a manner such that it is disposed in a space formed between the conveyor of the line and the trailing equipment and the conveyor, or may be used in the form of a single table without being linked with the line or trailing equipment.

The stage unit 10 is configured to seat the object 15 to be inspected such as a PCB substrate to be subjected to the vision inspection. For example, the stage unit 10 includes a robot arm, a conveying roller or a motor through a control of the control unit 60, The object to be inspected 15, which is conveyed by a conveying means such as a conveying means, is seated.

The camera unit 20 is configured to capture a two-dimensional shape of the object to be inspected and the grid pattern illumination light, and is installed in the center of the interior of the housing of the vision inspection apparatus.

The image sensing unit included in the camera unit 20 includes an imaging device such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal-Oxide Semiconductor).

The grid pattern irradiating unit 30 is arranged on the side of the camera unit 20 for measuring the height by irradiating the surface of the object to be inspected 15 with grating light.

The grid pattern irradiating unit 30 includes a grating or a liquid crystal panel or a digital micromirror display (DMD) and a light source.

The shadow of the lattice is irradiated onto the object 15 under the control of the control unit 60 and the degree of the shadow of the lattice is deformed on the object 15 is detected by the camera unit 20 The height of the object to be inspected can be calculated.

The illuminating unit 40 includes an upper illuminating member 42, a central illuminating member 44, and a lower illuminating member 46 at a lower portion of the camera unit 20, for illuminating the inspection object 15 .

Here, the upper illuminating member 42 emits red light, the central illuminating member 44 emits green light, and the lower illuminating member 46 emits blue light.

The illumination members (42, 44, 46) are configured as annular ring illumination and are arranged along the height direction inside the housing of the vision inspection apparatus.

At this time, the ring illumination disposed at a higher position among the illumination members (42, 44, 46) is constituted by ring illumination having a smaller diameter.

As described above, a typical vision inspection apparatus forms a grid-like shadow on the surface of the inspection object 15, and captures the grid-like shadow formed through the camera section 20. The three-dimensional height of the object to be inspected is measured.

Here, in the portion where the three-dimensional height is the same on the surface of the inspection object 15, the grid-like shadows are photographed in a straight line shape.

However, in the case where the three-dimensional height is different on the surface of the object to be inspected 15, the lattice-like shadows are distorted in such a manner as to be mutually misaligned. By calculating the degree of such distortion by the trigonometric function, It is possible to calculate the three-dimensional height of the lens 15.

The vision processor 50 calculates image information of the object 15 to be inspected obtained from the camera unit 20 through a mathematical process such as Fourier transform and compares the image information with a previously inputted reference value Thereby judging the defective quality of the object 15 to be inspected.

That is, the image photographed by the camera unit 20 is read by the vision processor 50 to calculate the three-dimensional height of the surface of the object to be inspected 15, If the stored reference data height is significantly higher or lower than the stored reference data height, it is determined that the object to be inspected 15, such as a chip on a PCB substrate, is not properly mounted.

The control unit 60 is a component for controlling driving and operation of the camera unit 20 and the illumination unit 40 and may be provided to control the driving of the entire inspection apparatus according to the present invention.

The controller 60 performs physical control such as position control of the inspection apparatus, processing of photographed images, and light source control according to a system control program, as well as performing a data operation operation.

In addition, the control unit 60 is responsible for overall control of an inspection device such as an output device control for outputting inspection results to a monitor and an input device control for an operator to set and input various items.

On the other hand, when the grid pattern irradiating unit 30 irradiates the grid pattern light, it is difficult to accurately grasp the shape of the grid pattern light due to the blurring of light in the area where the regular reflection occurs in the surface of the inspection object 15.

As described above, when the light is irradiated by the grid pattern irradiating unit 30, regular reflection of light occurs even when the illumination unit 40 has the same light irradiation angle.

That is, when the light irradiation angle by the grid pattern irradiating unit 30 is a, if the specular reflection occurs in the inspection object in the area of the light reflection angle a, the area of the illumination part 40 where the regular reflection occurs For the illumination member having the same light aberration a, specular reflection occurs with respect to the illumination light.

2, a red light R, a green light G and a blue light B are irradiated on the surface of the object 15 to be inspected. And the surface of the object 15 to be inspected by the green light illumination member 44 and the blue light illumination member 46 are different from each other, Each area has a different color of light.

If the specular reflection of the grid pattern irradiated light by the grid pattern irradiating unit 30 occurs in the blue light illumination part B, the light irradiation angle by the grid pattern irradiating unit 30 with respect to the object to be inspected 15 The angle of light irradiation by the blue light illuminating member 42 is the same or very similar to that of the blue light illuminating member 42. At this time, a shape irradiated with the lattice pattern light is photographed on the remaining area except for the area to which the blue light is irradiated, 15).

Thus, the reliability of the height calculation can be improved by calculating the height of the component only from the remaining region except for the portion where the grid pattern light by the grid pattern irradiating portion 30 causes regular reflection on the surface of the object 15 to be inspected.

While the present invention has been described with reference to the exemplary embodiments and the drawings, it is to be understood that the technical scope of the present invention is not limited to these embodiments and that various changes and modifications will be apparent to those skilled in the art. Various modifications and variations may be made without departing from the scope of the appended claims.

10: stage unit 20: camera unit
30: grid pattern inspection part 40: illumination part
50: vision processor 60:

Claims (6)

A vision inspection apparatus for photographing an object to be inspected assembled or assembled in a process of assembling a part with a camera and comparing the photographed image with a preliminarily inputted object image to discriminate the good or bad of the object to be inspected,
A stage unit for fixing or transferring the inspection object to an inspection position;
An illumination unit positioned above the stage unit and providing illumination to the object to be inspected;
A camera unit positioned at the center of the illumination unit to acquire a two-dimensional shape of the inspection object;
A grid pattern irradiating unit disposed on a side of the camera unit;
A vision processor for reading the image photographed by the camera unit and discriminating the good or bad of the object to be inspected;
And a control unit for controlling the stage unit, the grid pattern irradiating unit, and the camera unit,
Wherein the illumination unit includes a plurality of rows of illumination members arranged in a plurality of rows along a height direction of the vision inspection apparatus. The method according to claim 1,
Wherein the illumination unit comprises a red illumination member, a green illumination member, and a blue illumination member arranged in the height direction of the vision inspection apparatus. 3. The method of claim 2,
Wherein the illumination members are ring lights arranged annularly inside the housing of the vision inspection apparatus. The method of claim 3,
And the ring illumination disposed at a higher position in the illumination section is constituted by a ring illumination of a smaller diameter. 5. The method of claim 4,
And the height of the object to be inspected is calculated only by the region other than the region where the light is regularly reflected by the grid pattern irradiating portion. 6. The method of claim 5,
The region where the light is regularly reflected by the grid pattern irradiating portion is judged as the light irradiation angle by the grid pattern irradiating portion and only the region other than the light irradiation region by the illumination member having the same light irradiation angle as the grid pattern irradiating portion, Of the plurality of rows of illumination members.

Images