CN102313741B - Automatic optical detection system - Google Patents

Abstract

The invention relates to an automatic optical detection system, which comprises a first image acquisition device, a database and a comparison unit. The first image capturing device is used for capturing a captured image of a combined frame, wherein the captured image comprises a joint area of the combined frame. The database is used for storing at least one reference image. The comparison unit is electrically connected with the first image capturing device and the database and used for comparing the captured image with the reference image and judging whether the combined frame has defects or not. The automatic optical detection system can shorten the time for detecting the combined frame and save the related labor cost.

Description

Automatic Optical Inspection System

technical field

The present invention relates to an automatic optical inspection system, in particular to an automatic optical inspection system for inspecting the bonding quality of a combined frame.

Background technique

In order to reduce the generation of waste, most of the rectangular frames currently used in flat panel displays are combined frames formed by joining multiple components. For example, as shown in FIG. 1a, the combined frame 1 is formed by joining two L-shaped components 11a and 11b. Please refer to FIG. 1b to FIG. 1e, a plurality of elongated members 12a-12d, L-shaped members 13a, 13b and elongated members 13c, equilateral U-shaped members 14a, 14b or unequal U-shaped members 15a, 15b also Can be jointed into required modular frames. The production process of the above combined frame is to punch out L-shaped, strip-shaped or U-shaped components first, and then join the components by appropriate methods, such as welding or riveting. In order to confirm the quality of joints, currently manpower is used to inspect the joints of the combined frame one by one, which not only reduces the production speed, but also increases labor costs.

To sum up, how to confirm the bonding quality of the bonding area of the combined frame at a lower cost and faster speed is a goal that needs to be worked hard at present.

Contents of the invention

The object of the present invention is to provide an automatic optical inspection system, which uses an image capture device to capture an image of a combined frame, and compares the captured image with a reference image to automatically confirm the joint of the combined frame quality.

An automatic optical inspection system according to the present invention includes a first image capture device, a database and a comparison unit. The first image capturing device is used for capturing a captured image of a combined frame, wherein the captured image includes the joint area of the combined frame. The database is used for storing at least one reference image. The comparing unit is electrically connected with the first image capturing device and the database, and is used for comparing the captured image and the reference image, and determining whether the combined frame is defective.

The beneficial technical effect of the present invention is: the automatic optical inspection system of the present invention can automatically capture the image of the combined frame, and compare the captured image with a reference image to confirm the joining quality of the combined frame. Therefore, the automatic optical inspection system of the present invention can greatly shorten the time for inspecting and producing the combined frame, and save labor costs for testing the joint quality of the combined frame.

Description of drawings

The present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings, when it is easier to understand the purpose, technical content, characteristics and effects of the present invention, wherein:

1a to 1e are schematic diagrams showing a conventional combined frame.

FIG. 2 is a schematic diagram showing an automatic optical inspection system according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing the relative positions of the image capture device and the combined frame of the automatic optical inspection system according to another embodiment of the present invention.

Detailed ways

Please refer to FIG. 2 , an automatic optical inspection system according to an embodiment of the present invention includes a first image capture device 21 a , a database 22 and a comparison unit 23 . The first image capturing device 21 a is used for capturing a captured image of a combined frame 1 . The captured image includes the junction area of the composite frame 1 . The combined frame 1 is applied to a flat display device, which can be composed of L-shaped components, strip-shaped components, U-shaped components or a combination thereof, as shown in FIGS. 1a to 1e. In one embodiment, the first image capture device can be a charge coupled device (Charge Coupled Device, CCD), a complementary metal oxide semiconductor (Complementary Metal-Oxide-Semiconductor, CMOS) sensor or a contact image sensor (Contact ImageSensor , CIS). The database 22 is used for storing at least one reference image. The comparison unit 23 is electrically connected to the first image capturing device 21 a and the database 22 . The comparing unit 23 compares the captured image captured by the first image capturing device 21 a with the reference image stored in the database 22 , and determines whether there is a defect in the bonding area of the combined frame 1 .

In one embodiment, the reference images stored in the database 22 may be captured images of combined frames with defects. Therefore, when the captured image captured by the first image capture device 21 a is identical to the reference image, it can be determined that the combined frame has a defect and must be removed. When the captured image is different from the reference image, the combined frame is determined to be qualified. It should be noted that the combined frame determined to be qualified may contain a new type of defect, that is, the captured image is different from the reference image in the database 22 . At this point, storing the captured image containing the new type of defect in the database can be used as a reference image for the next inspection.

In another embodiment, the reference images stored in the database 22 may be captured images of qualified composite frames. Therefore, when the captured image captured by the first image capture device 21 a is identical to the reference image, the combined frame is determined to be a qualified product. When the captured image is different from the reference image, it can be determined that the combined frame has defects and must be removed.

Please refer to FIG. 2 again. In one embodiment, the automatic optical inspection system of the present invention includes a warning unit 24 electrically connected to the comparison unit 23 . The warning unit 24 can be used to warn an operator to take appropriate action when the comparison unit 23 detects a defective composite frame. For example, the warning unit 24 can be an indicator light or display appropriate warning information on a display device.

Please refer to FIG. 3 , in one embodiment, the automatic optical inspection system of the present invention includes a second image capture device 21b. The second image capture device 21b is also used to capture the captured image of the combined frame for the comparison unit 23 to compare it with the reference image. In one embodiment, the second image capture device 21b can be a charge-coupled device, a CMOS sensor or a contact image sensor. As shown in FIG. 3 , the first image capture device 21a is disposed above the combined frame, that is, the direction of the image captured by the first image capture device 21a is perpendicular to the plane where the combined frame is located. The first image capture device 21a can be used to capture a top view image of the combined frame. The second image capture device 21b is disposed obliquely above the combined frame, that is, the direction of capturing images by the second image capture device 21b has an included angle with the plane where the combined frame is located. The second image capture device 21b can be used to capture oblique images of the combined frame. The top-view image captured by the first image capture device 21 a can be used to determine defects such as skewed welding, offset welding, incomplete weld bead or weld bead damage. The oblique image captured by the second image capture device 21b can be used to determine the defect that the components constituting the combined frame are not coplanar, for example, the components 11a and 11b have a height difference in the joint area, as shown in FIG. 3 .

Please refer to FIG. 3 again. In one embodiment, the automatic optical inspection system of the present invention includes a first light source 25a disposed on the upper surface side of the combined frame. The first light source 25a is used to provide illumination on the upper surface of the combined frame, so that the first image capture device 21a and/or the second image capture device 21b can capture a clearer captured image. In one embodiment, the first light source 25a can be a ring light source, and the first image capture device 21a captures the image of the combined frame through the central hole 251 of the ring light source, so that the upper surface of the combined frame will not There are blind spots for lighting and capturing images. It should be noted that arranging multiple first light sources 25a can also achieve the same effect as the ring light source. In addition, in one embodiment, the automatic optical inspection system of the present invention further includes a second light source 25b disposed on the lower surface side of the combined frame. In this way, when the weld bead is incomplete or damaged, the light emitted by the second light source 25b will pass through the defect of the weld bead, and be captured by the first image capture device 21a and presented on the captured image, so that The comparison unit 25 is easy to determine defects such as incomplete weld bead or damaged weld bead. It should be noted that the first light source 25a and/or the second light source 25b may include various light emitting color systems. According to the material properties of the combined frame, the operator can select a light source with a suitable color system to make the combined frame generate proper reflection for the image capture device to capture images.

To sum up the above, the automatic optical inspection system of the present invention can automatically capture the image of the combined frame, and compare the captured image with a reference image to confirm the joining quality of the combined frame. Therefore, the automatic optical inspection system of the present invention can greatly shorten the time for inspecting and producing the combined frame, and save labor costs for testing the joint quality of the combined frame.

The above-described embodiments are only for illustrating the technical idea and characteristics of the present invention, and its purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly. When it cannot limit the patent scope of the present invention, That is, all equivalent changes or modifications made according to the spirit disclosed in the present invention shall still fall within the patent scope of the present invention.

Claims (8)

1. an automatic optical detecting system is applied to use the fault detection at the combined frame of a flat display apparatus, it is characterized in that, comprises:

First image capture unit, in order to capturing the pick-up image of described combined frame, described pick-up image comprises the engaging zones of described combined frame and described pick-up image direction perpendicular to the plane at described combined frame place;

First light source is arranged at the upper surface side of described combined frame;

Secondary light source is arranged at the lower face side of described combined frame;

Database is in order to store at least one with reference to image; And

Comparing unit, described comparing unit and described first image capture unit and described database electrically connect, and in order to more described pick-up image and with reference to image, and judge whether described combined frame exists defective;

Second image capture unit, the plane at the pick-up image direction of described second image capture unit and described combined frame place has an angle, in order to capturing the stravismus image of described combined frame, and judge the not coplanar defective of member that constitutes described combined frame.

2. automatic optical detecting system according to claim 1 is characterized in that:

Described first light source comprises multiple luminous colour system.

3. automatic optical detecting system according to claim 1 is characterized in that:

Described first light source is annular light source.

4. automatic optical detecting system according to claim 1 is characterized in that:

Described secondary light source comprises multiple luminous colour system.

5. automatic optical detecting system according to claim 1 is characterized in that:

Described first image capture unit comprises Charged Coupled Device, CMOS semiconductor sensor or contact image sensor.

6. automatic optical detecting system according to claim 1 is characterized in that:

Described second image capture unit comprises Charged Coupled Device, CMOS semiconductor sensor or contact image sensor.

7. automatic optical detecting system according to claim 1 is characterized in that:

Also comprise: the caution unit,

Itself and described comparing unit electrically connect, and detect this combined frame with defective in order to warn the operator.

8. automatic optical detecting system according to claim 1 is characterized in that:

Described combined frame comprises L type member, long strip type member, U-shaped member or above combination.

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