TWI536013B - Calibration method for appearance inspection of electronic components - Google Patents

Description

Image calibration method for electronic component appearance inspection

In particular, the present invention provides an appearance detection of an electronic component applied to an image pickup device, and obtains an actual appearance image of the electronic component, thereby correctly determining whether the appearance of the electronic component conforms to a standard, thereby effectively improving the appearance detection of the electronic component. The accuracy of the image calibration method.

According to the current research and development and innovation, the work that must be completed by many large-scale electronic circuits has been completely replaced by integrated circuits (ICs), because ICs are multi-channel in the production process. In order to ensure the quality of the product, the manufacturer will perform the appearance inspection work in addition to the electrical test of the internal circuit after the IC is completed. The appearance detection of the so-called 5S in the industry usually refers to the appearance inspection of the five faces of the electronic component (except the top surface of the pick-and-place device that is adsorbed and transferred) to detect the electronic component in the process of process or transfer. Whether the spacing or length of the electrical contacts meets the standard, or whether the electrical contacts are damaged, spilled, stained, etc., and then screen out good electronic components to eliminate defective products.

Referring to FIG. 1 , in the appearance inspection operation of the conventional electronic component, the electronic component 11 is transferred to the image capturing device 20 by the pick and place device 10 for image taking, and then analyzed by the controller to determine whether or not it is For good products. The image capturing device 20 is provided with an image pickup device 21 as a CCD at a lower position, and the bottom surface of the electronic component 11 can be imaged from bottom to top, and the analysis of the controller is performed to determine the electronic component 11 Whether the bottom surface meets the standard or not; the image capturing device 20 is provided with a frame 22 above the image capturing device 21, and the refracting mirror 23 is respectively mounted on the four inner circumferential sides of the frame 22, Four inner circumference sides The mirror 23 can display images of the four sides of the electronic component 11, so that when the image capturing device 21 focuses the image of the four prisms 23, the images of the four sides of the electronic component 11 can be obtained and transmitted through The analysis of the controller compares whether the four sides of the electronic component 11 meet the standard, and then screens out good electronic components to eliminate defective products. However, such an image capture method will have the following drawbacks:

1. Since the image pickup unit 21 cannot be assembled to achieve accurate verticality due to assembly tolerances and the like after assembly and erection, the image pickup 21 and the electronic component cannot be accurately positioned when the bottom surface of the electronic component 11 is imaged. The bottom surface of the substrate 11 is maintained in the orthogonal direction, which causes the appearance image of the bottom surface of the electronic component 11 obtained by the image pickup device 21 to be deformed, and it is impossible to correctly determine whether the bottom surface of the electronic component 11 conforms to the standard according to the deformed appearance image, thereby reducing the pair. The accuracy of the appearance of electronic components.

2. The refracting image magnifying mirrors 23 are respectively mounted on the four inner peripheral sides of the frame 22, and it is impossible to ensure a precise image capturing angle due to assembly tolerances and the like, and thus the refracting image magnifying mirror 23 appears The image of the four sides of the electronic component 11 is deformed. When the image pickup unit 21 focuses the image on the four prisms 23, the correct image of the four sides of the electronic component 11 cannot be obtained, and the deformation cannot be performed according to the deformation. The appearance image correctly determines whether the four sides of the electronic component 11 conform to the standard, thereby reducing the accuracy of the appearance detection of the electronic component.

In view of this, the inventor has been engaged in research and development and production experience of related industries for many years, and has conducted in-depth research on the problems currently faced. After long-term efforts and research, he has finally developed an effective improvement of the appearance detection accuracy of electronic components. The image acquisition method is used to effectively improve the shortcomings of the prior art, which is the design tenet of the present invention.

The object of the present invention is to provide an image capturing and calibrating method for visually detecting an appearance of an electronic component, which is provided with a frame having a precise level above the image capturing device, and at least one of the inner peripheral side of the frame is mounted on the inner side of the frame. Mirror, another form of precision can be placed on the frame calibration a fixture, the calibration fixture is provided with at least one side having precise perpendicularity and a bottom surface having a precise level, and a sample image arranged in an array is formed on the side surface and the bottom surface to make the image The image of the bottom surface of the image can be taken from below, and the image capturing error value of the image capturing device is obtained through analysis of the controller, and the image capturing device is adjusted by the image capturing error value, and then the image is adjusted. The post-camera imager takes image of the sampled image on the side of the mirror, and obtains the projection error value of the mirror through the analysis of the controller, and then uses the projection error value of the mirror as the side of the subsequent electronic component. The compensation value of the image is obtained, and the actual appearance image of the electronic component is obtained, and the appearance of the electronic component is correctly judged to conform to the standard, thereby effectively improving the accuracy of the appearance detection of the electronic component.

Conventional part:

10‧‧‧ picker

11‧‧‧Electronic components

20‧‧‧Image capture device

21‧‧‧Imager

22‧‧‧ frames

23‧‧‧Ling Mirror

Part of the invention:

30‧‧‧ machine

31‧‧‧Electronic components

32‧‧‧ picker

40‧‧‧Image capture device

41‧‧‧Imager

42‧‧‧ frames

421‧‧‧ top surface

43‧‧‧Ling Mirror

50‧‧‧ calibration fixture

51‧‧‧Contact

52‧‧‧Sampling bumps

521‧‧‧ side

5211‧‧‧Sampling image

522‧‧‧ bottom

5221‧‧‧Sampling image

Figure 1: Schematic diagram of the structure of the conventional appearance inspection.

Figure 2: Schematic diagram of the process of the present invention.

Figure 3 is a schematic view of the image taking device of the present invention.

Figure 4: Schematic diagram of the calibration fixture of the present invention.

Fig. 5 is a schematic view showing the image taking of the bottom surface of the calibration jig by the image taking device of the present invention.

Fig. 6 is a schematic view showing the image taking by the image taking device of the present invention on the side of the calibration jig.

Fig. 7 is a schematic view showing the image taking of the electronic component to be tested by the image taking device of the present invention.

In order to make the present invention further understand the present invention, the preferred embodiment and the drawings are described in detail as follows: Please refer to FIGS. 2 and 3, the image capturing method for visual inspection of the electronic component of the present invention, firstly The first step is to set up the image capturing device 40. The image capturing device 40 is provided with an adjustable image capturing device 41 on the machine table 30. Above the image capturing device 41, a frame 42 is mounted. The top surface 421 of the frame 42 has a precise level, and the inner circumference side of the frame 42 is provided with at least one refracting image. In this embodiment, The prisms 43 are respectively attached to the four inner circumference sides of the frame 42, and the image pickup unit 41 can respectively focus and image the four prisms 43.

Please refer to Figures 2, 4, and 5, and then the second step is to form a calibration fixture 50; the calibration fixture 50 is generally T-shaped, and has a precise level of contact surface 51 formed through rigorous processing. The calibration fixture 50 can be accurately placed on the top surface 421 of the frame 42 by using the contact surface 51, and the calibration fixture 50 is provided with a sampling bump 52 protruding downward through strict processing. When the calibration fixture 50 is placed on the frame 42 , the sampling protrusion 52 is placed in the frame 42 , wherein the sampling protrusion 52 is provided with at least one side 521 having precise perpendicularity and a The bottom surface 522 has a precise level, and the sampled images 5211 and 5221 arranged in an array are respectively formed on the side surface 521 and the bottom surface 522. In the embodiment, the sampling bumps 52 are provided with four precision vertical degrees. The side surface 521, the sample image 5211 of the four side surfaces 521 may be a plurality of concave holes arranged in an array and having the same pitch and size, or other plurality of regular shapes arranged in an array and having the same pitch and size, the sampling The sampled image 5221 of the bottom surface 522 of the bump 52 may also be the same One arranged in an array and having the same pitch and size of recesses or a plurality of other and arranged in an array having a regular pitch and the same dimensions of the molded article.

Please refer to FIG. 2 and FIG. 5, and then the third step is to adjust the image pickup device 41 of the image capturing device 40. The calibration fixture 50 is placed on the frame 42 and captured by the image capturing device 40. The camera 41 takes an image of the bottom surface 522 of the calibration fixture 50. Since the calibration fixture 50 is formed with a precise level of the abutting surface 51, and the frame 42 also has a top level 421 of precise level, when calibrating When the fixture 50 is placed on the top surface 421 of the frame 42 , the calibration fixture 50 can still be placed on the four sides 521 of the sampling bumps 52 in the frame 42 to maintain its accuracy. The verticality, and the bottom surface 522 of the sampling bump 52 of the calibration fixture 50, still maintains its precise level, and then the imager 41 samples the bottom surface 522 of the calibration fixture 50 from below. The image 5221 is imaged. Since the data of the size and the spacing of the sampled image 5221 is already built in the database of the controller, the image taken by the image capture device 41 on the sample image 5221 of the bottom surface 522 can be transmitted through the image. The analysis error of the controller is obtained, and the image capturing error value of the image of the image of the bottom surface 522 of the image pickup unit 41 is obtained. As described above, the bottom surface 522 of the sampling bump 52 of the calibration fixture 50 is maintained. Accurate level, so the generation of the image error value can be attributed to the error of the image finder 41, and the image finder 41 can be directly adjusted with the image error value, so that the image finder 41 and the sampler are sampled. The bottom surface 522 of the bump 52 is adjusted to remain in the orthogonal direction.

Referring to FIGS. 2 and 6, the fourth step is to calculate the projection error value of the mirror 43 of the image capturing device 40; since the image pickup 41 of the image capturing device 40 has been calibrated, and the bottom surface of the sampling bump 52 The 522 is held in the orthogonal direction, so that the four mirrors 43 are respectively imaged by the adjusted image pickup 41, since the four mirrors 43 can show the sampling of the four side faces 521 of the sampling bumps 52. The image 5211, so that when the image capturing device 41 respectively focuses the image on the four mirrors 43, the image of the image of the four sides 521 is obtained, and the image of the sampled image 5211 is obtained. The data of the size and the spacing are built into the database of the controller. Therefore, the image taken by the image capturing device 41 on the four sides 521 of the sampled image 5211 can be obtained through the analysis and comparison of the controller. The projection error value of the four mirrors 43 for the sampled image 5211 of the four sides 521 is as described above, since the imager 41 of the image capturing device 40 has been calibrated, and the calibration fixture 50 The four sides 521 of the sampling bump 52 maintain their precise perpendicularity, so the projection error Generating an error value may be attributed to problems of erecting prism 43, the prism 43 but can not be adjusted, and must be compensated is calculated in order to obtain the actual appearance of the image side surface.

Referring to FIGS. 2 and 7, the fifth step is followed by moving the electronic component 31 into the image capturing device 40 for image capture; as described above, since the image pickup device 41 of the image capturing device 40 has been calibrated, the pick and place device is used. 32 moving the electronic component 31 to be detected into the image capturing device When the image is taken, the image capturing device 41 can directly take the image from the bottom surface of the electronic component 31 to obtain the actual appearance image of the bottom surface of the electronic component 31. Since the standard image data of the bottom surface of the electronic component 31 is built in. In the database of the controller, it is possible to determine whether the bottom surface of the electronic component 31 conforms to the standard through the analysis comparison of the controller; then, when the image capturing device 41 focuses on the four mirrors 43 respectively, each diamond can be The projection error values generated by the mirrors 43 are respectively compensated for the image of the four sides of the electronic component 31, and the actual appearance images of the four sides of the electronic component 31 are obtained, because the standard image data of the four sides of the electronic component 31 are obtained. It is built into the database of the controller, so it can be judged whether the four sides of the electronic component 31 meet the standard through the analysis comparison of the controller.

In summary, with the image capturing calibration method of the present invention, it is apparent that the actual appearance image of the bottom surface and the side surface of the electronic component can be obtained, and it is possible to correctly judge whether the appearance of the electronic component conforms to the standard, thereby effectively improving the appearance detection of the electronic component. Accuracy; accordingly, the present invention is a practical and progressive design, but there is no disclosure of the same product and publication, thereby allowing the invention patent application requirements, and applying according to law.

40‧‧‧Image capture device

41‧‧‧Imager

42‧‧‧ frames

43‧‧‧Ling Mirror

50‧‧‧ calibration fixture

52‧‧‧Sampling bumps

521‧‧‧ side

5211‧‧‧Sampling image

522‧‧‧ bottom

5221‧‧‧Sampling image

Claims (9)

An image capturing and calibrating method for visual inspection of an electronic component includes the steps of: erecting an image capturing device: the camera is provided with an image capturing device and a frame having a top surface with a precise level, and the frame is mounted on the frame The inner circumference side is provided with at least one prism, and the image pickup device can focus and image the magenta; the forming calibration fixture step: the calibration fixture is formed with a precise level of contact surface, and Having at least one side having precise perpendicularity and a bottom surface having a precise level, the side surface and the bottom surface are respectively formed with a sample image; and the image capturing device of the image capturing device is adjusted: the calibration is performed The jig is placed on the top surface of the frame, and the sampled image of the bottom surface of the calibration jig is taken by the image taking device, and the comparison is adjusted by the controller to adjust the fetching a method for calculating a projection error value of a magnifying lens of the image capturing device: the image capturing device picks up the magnifying lens to obtain an image of the side sample image of the calibration jig, and transmits the image through the control Analytical comparison of the device, obtaining the prism to sample the side of the calibration fixture The projection error value of the image; the electronic component moving into the image capturing device to take the image capturing step: moving the electronic component into the image capturing device, and the image capturing device takes the bottom surface of the electronic component and the image of the prism, thereby obtaining the bottom surface of the electronic component The actual appearance image, and the projection error value generated by the prism is compensated for the image of the side of the electronic component, and the actual appearance image of the side of the electronic component is obtained, and the analysis is compared by the controller. It is judged whether the bottom surface and the side surface of the electronic component meet the standard. The method for calibrating an appearance of an electronic component according to claim 1, wherein the step of forming the calibration fixture is such that the calibration fixture has a sampling bump protruding downwardly and on the sampling bump. It is provided with at least one side with precise perpendicularity and a bottom surface with precise level. According to the method for calibrating the appearance of an electronic component according to the second aspect of the patent application, the sample image of the side surface and the bottom surface of the sampling bump is a plurality of regular shapes arranged in an array and having the same pitch and size. . The method for calibrating an appearance of an electronic component according to the first aspect of the patent application, wherein the database of the controller has built-in data of a sample image of a side surface and a bottom surface of the calibration fixture. According to the method for calibrating the appearance of an electronic component according to the first aspect of the patent application, the database of the controller has built-in standard image data of the side surface and the bottom surface of the electronic component. The image capturing method for visual inspection of an electronic component according to the first aspect of the patent application, wherein the image capturing device of the adjusting image capturing device is compared with the image analysis by the controller, and the image capturing device is obtained. The image capturing error value of the image of the bottom surface of the calibration jig is adjusted, and the image capturing device is adjusted with the image capturing error value. According to the method for calibrating the appearance of the electronic component according to the sixth aspect of the patent application, wherein the image pickup is adjusted after the image capturing error value is adjusted, the bottom surface of the image capturing device and the calibration fixture are adjusted The school remains in the orthogonal direction. The image capturing method for visual inspection of an electronic component according to the first aspect of the invention, wherein the step of erecting the image capturing device is provided with a prism mounted on each of four inner peripheral sides of the frame. The image aligning method for visual inspection of an electronic component according to claim 8 is characterized in that the step of forming the calibration fixture is such that the calibration fixture has four sides with precise perpendicularity.