TWI673478B - Optical testing equipment and method thereof - Google Patents

Abstract

A color light optical detection device is provided with a platform on which a test piece bearing portion is provided. A light source module and a photographing module are provided above the test piece bearing portion, and a control module is electrically connected to the light source module. And the photographic module, the light source module can respectively emit two or more colored lights with different wavelengths toward the test piece bearing portion, and the photographic module includes a camera body and a non-achromatic lens; when the present invention is used, it is A test piece is set on the test piece bearing portion, and the control module drives the light source module to illuminate the test piece with monochromatic color light, and then a monochromatic image is shot by the photographing module. With different characteristics of the focal plane position, different heights of the test piece are selected for optical detection.

Description

Colored light optical detection equipment and method

The invention relates to an optical inspection method, in particular to an optical detection device and method for capturing monochrome images for image recognition.

The current method for detecting defects of electronic components such as display panels and circuit boards is to obtain all or part of the display panel and circuit board by using an optical inspection equipment (AOI) to illuminate and photograph the test panel and circuit board test strips. Image, and then use computer image recognition or manual interpretation to determine whether the electronic component is defective.

Although the above-mentioned method for detecting electronic components using optical detection equipment can achieve the effect of judging the defects of electronic components, when the optical detection equipment is shooting electronic components, in order to make the captured shooting image clear, the depth of field is used to cover the entire height of the electronic components. Camera lens to shoot, but in this way the images of the test strip regardless of the height position will be superimposed in the same image frame, when the test strip has a certain degree of transparency or when the surface of the test strip has a high and low level difference, it is complicated and back and forth Confused photographic images are particularly prone to making it difficult to determine test strip flaws.

Because the existing optical detection equipment cannot respectively shoot images with clear display contents at different heights of the test strip at different heights, it is difficult to read the optical images. To this end, the present invention provides a device and method that can shoot clear images in different focal planes, and improve the accuracy of image recognition.

In order to achieve the above object, the present invention provides a color light optical detection device, including: a body provided with a platform on which a test piece bearing portion is provided; a light source module disposed above the platform, and the light source module A light module can emit colored light of two or more different wavelengths toward the test piece bearing part; a photographing module is provided with a camera body above the platform, and a non-achromatic lens is mounted on the camera body, and the non-achromatic lens faces the The test strip loading section captures an image; and a control module, which is electrically connected to the light source module and the camera body, respectively, and the control module controls the camera body to respectively shoot a light source module when the light source module is illuminated with a monochromatic color light. Monochrome images, each monochrome image shows a clear focal plane position with different heights, and each monochrome image is used by the control module to identify defects.

Preferably, the present invention is provided with a suspension arm on one side of the platform, and the light source module and the photography module are respectively disposed on the suspension arm.

Operating the above-mentioned colored light optical detection device, the present invention provides an optical detection method, the steps of which include: setting a test piece: placing a test piece on a test piece bearing portion; shooting a monochrome image: illuminating the test with a single color light And use a photographic module with a non-achromatic lens to take a monochromatic image of the test strip, and select the monochromatic image to display a clear focal plane by selecting different wavelengths of colored light to illuminate the test strip; and identify defects : Detect flaws at the same height as the test piece and the focal plane with the monochrome image.

The effect of the present invention is that the position of the focal plane can be changed by changing the wavelength of the colored light used in the illumination. Therefore, when the user needs to detect the position of the top surface of the test strip is different, or the bottom surface of the video sheet is changed, The monochromatic image can be obtained by taking the monochromatic image of the color light, and the image of the focal plane can be obtained for optical detection and interpretation, which can avoid the influence of the images on the test strip at different levels, and it is more accurate to identify and judge the defects of the test strip at different levels.

10‧‧‧ body

11‧‧‧platform

12‧‧‧ Cantilever

13‧‧‧Test piece loading section

20‧‧‧light source module

30‧‧‧Photographic Module

31‧‧‧ camera body

32‧‧‧non-achromatic lens

40‧‧‧control module

A‧‧‧ Test piece

X‧‧‧ focal plane

Y‧‧‧ focal plane

FIG. 1 is a schematic diagram of a color light optical detection device according to a preferred embodiment of the present invention.

FIG. 2 is a block diagram of a color light optical detection device according to a preferred embodiment of the present invention.

3 is a schematic diagram of different focal planes of a color light optical detection device according to a preferred embodiment of the present invention.

FIG. 4 is a flowchart of steps of an optical detection method according to a preferred embodiment of the present invention.

In order to understand the technical features and practical effects of the present invention in detail, and can be implemented in accordance with the contents of the description, the preferred embodiment shown in the drawings is further described in detail as follows.

Please refer to the preferred embodiment of the present invention as shown in FIG. 1 and FIG. 2. The present invention provides a color light optical detection device, including: a body 10 including a platform 11 and a suspension arm 12 coupled to one side of the platform 11. In this preferred embodiment, the suspension arm 12 is a mechanical arm, and a test piece supporting portion 13 is provided on the platform 11. The test piece supporting portion 13 is used for placing a test piece A of an electronic component.

A light source module 20 is fixedly coupled to the suspension arm 12 and is located above the test piece bearing portion 13. The light source module 20 can emit colored light of two or more different wavelengths toward the test piece bearing portion 13. The light source module 20 emits different wavelengths, that is, the colored light of different colors can be separated at the same place or location. For example, in the preferred embodiment, the light source module 20 can emit red lights toward the test piece bearing portion 13 at the same place. And blue shades.

A photographic module 30 includes a camera body 31 and a non-achromatic lens 32 mounted on the camera body 31. The camera body 31 is a camera body of a charge coupled device (CCD) and is fixedly coupled to the suspension arm 12. The non-achromatic lens 32 may be a lenticular lens without chromatic aberration correction. Single lens lenses such as mirrors, meniscus lenses, etc., and the non-achromatic lens 32 is preferably a lens having a shallow depth of field so as not to cover the entire height of the test piece A. The focal point of the non-achromatic lens 32 is located at the top of the test piece A. Between the bottom surface and the bottom surface, but can be adjusted to be slightly higher than the top surface of the test strip A or slightly lower than the bottom surface of the test strip A according to shooting requirements, and the non-achromatic lens 32 shoots an image toward the test strip bearing portion 13 The light reflected by the light source module 20 to illuminate the test piece carrier 13 will fall into the field of view of the non-achromatic lens 32.

A control module 40 is electrically connected to the suspension arm 12, the light source module 20, and the camera body 31, respectively. The control module 40 drives the light source module 20 to illuminate the test piece A with blue or red colored light. At this time, the camera body 31 is controlled to shoot a monochromatic image of the test piece A. Due to the different focal lengths of colored light of different wavelengths and colors, for example, the focal length of shorter blue light is shorter than that of longer red light. Monochrome images of different colors show clear focal plane positions with different heights.

As shown in FIG. 3, in the preferred embodiment, the focal plane X position of the blue monochrome image is higher than the focal plane Y position of the red monochrome image. The present invention appropriately adjusts the non-achromatic before use. After the focal point position of the lens 32 and the color wavelengths of the red and blue light emitted by the light source module 20, the focal plane X and Y positions of the blue and red monochrome image can be located on the top surface of the test piece A. And the bottom surface, when the control module 40 is provided with the monochrome image to judge the flaws on the top or bottom surface of the test piece A, the monochrome image pair can be selected by adjusting the color of the color light emitted by the light source module 20 The height of the focal plane of the test piece A should be adjusted by changing the wavelength of the colored light of the illumination, instead of adjusting the focal plane height by adjusting the change of the focal point of the non-achromatic lens 32 (usually the camera module 30 does not Adjust the focus point again) to avoid the interference of the images of different heights of the test strip A, so that the flaws at the same height of the test strip A and the focal plane can be more accurately determined.

As shown in the flowchart of the steps shown in FIG. 4, the present invention operates the color light optical detection device to perform a color light optical detection method, and the steps include:

(S01) Setting a test piece: As shown in FIG. 1 and FIG. 2, a test piece A is placed on a test piece bearing portion 13.

(S02) Take a monochrome image: Illuminate the test piece A with the monochromatic light such as red or blue color light emitted by the light source module 20, and use the non-achromatic lens 32 of the photographic module 30 to shoot the test piece A A red or blue monochrome image. As described above, by selecting colored light with different wavelengths to illuminate the test piece A to capture a monochrome image, the monochrome image can be selected to display a clear focal plane, such as a shorter wavelength. The color light illuminates the test piece A, and the monochromatic image shows a clearer focal plane position of the test piece A, and vice versa, the lower the focal plane position. The image corresponds to the focal plane height of test piece A.

(S03) Detecting defects: Detecting defects in the test strip A and the focal plane by using the monochrome image to provide the control module 40 or manually, to avoid overlapping display of content at different height positions in the same image, causing It is difficult to judge the defects in the image.

The above description is only the preferred embodiments of the present invention, and is not intended to limit the scope of the rights claimed by the present invention. Any other equivalent changes or modifications made without departing from the spirit disclosed by the present invention should be included in the present invention. Within the scope of patent application.

Claims (3)

A color light optical detection device includes: a body provided with a platform on which a test piece bearing portion is provided; a light source module disposed above the platform, and the light source modules can respectively face the test piece bearing portion Emitting two or more colored lights of different wavelengths; a photographing module is provided with a camera body above the platform, a non-achromatic lens is mounted on the camera body, and the non-achromatic lens is directed toward the test piece loading portion to shoot an image; And a control module, which is electrically connected to the light source module and the camera body, respectively, the control module controls the camera body to take a monochromatic image when the light source module is illuminated with colored light of the same wavelength, by selecting different wavelengths The color light is used to select whether the monochrome image shows a clear focal plane height, and the control module uses the monochrome image to judge a defect. According to the color light optical detection device of claim 1, a suspension arm is provided on one side of the platform, and the light source module and the photographing module are respectively disposed on the suspension arm. A color light optical detection method includes the steps of: setting a test piece: placing a test piece on a test piece bearing portion; shooting a monochromatic image: illuminating the test piece with monochromatic color light, and photographing with a non-achromatic lens The module shoots a monochromatic image of the test strip. By selecting the color light of different wavelengths to illuminate the test strip, the monochromatic image is selected to display a clear focal plane, which is located between the top and bottom surfaces of the test strip. ; And interpretation of flaws: use the monochrome image to determine flaws at the same height as the test strip and the focal plane.