Illumination system, automatic optical inspection device including the illumination system, and method thereof
A lighting system and lighting unit technology, applied in the field of lighting systems, can solve problems such as the difficulty in detecting copper-colored copper foil pads exposed copper, the inability to truly restore the color of the tested circuit board, and the color cast of the image to achieve enhanced Effect of appearance defect detection ability
Active Publication Date: 2016-08-24
上海赫立智能机器有限公司
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to overcome the problem that the lighting system in the prior art easily causes image color cast and cannot truly restore the color of the inspected circuit board, as well as the problem of virtual soldering of mounted components, and the problem of red copper-colored copper There are relatively difficult defects in the detection of exposed copper problems on foil pads, and a lighting system, an automatic optical inspection device including the lighting system and a method thereof are provided
Method used
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[0027] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.
[0028] Such as figure 1 As shown, the lighting system of the present invention includes a casing 1, which is a hollow structure, and the top surface and the bottom surface of the casing 1 are both provided with openings, and a dust protection lens 5 is provided at the opening of the top surface. During detection, the circuit board 7 to be tested is laid flat under the casing 1 .
[0029] An oblique lighting unit is accommodated at the bottom of the casing 1 . The oblique illumination unit includes a plurality of first light emitting elements 2, which form an inverted cone-shaped light beam, and the light beam is irradiated on the circuit board 7 to form an oblique illumination area. The oblique lighting unit is a prior art, and will not be repeated here. However, different from the pr...
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The invention discloses a lighting system, an automatic optical detector comprising the lighting system, and a method of the automatic optical detector. The lighting system comprises an oblique incidence lighting unit and a coaxial epi-lighting unit which respectively form an oblique incidence lighting area and an epi-lighting area on a detected circuit board, and both of the lighting areas cover the detected area of the detected circuit board. The automatic optical detector further comprises a camera vertically arranged above the lighting system. The method comprises the steps: firstly, starting the coaxial epi-lighting unit, utilizing the camera to acquire a first picture of the detected circuit board; secondly, closing the coaxial epi-lighting unit; thirdly, starting the oblique incidence lighting unit, and utilizing the camera to acquire a second picture of the detected circuit board; and fourthly, closing the oblique incidence lighting unit. The true color of the detected circuit board can be truly restored, and a bonding pad covered by a soldering tin on a red copper foil bonding pad and a bonding pad with copper exposure defect can be effectively distinguished. The coaxial epi-lighting unit enhances the capability of detecting appearance defects at the soldering position of mounting elements.
Description
technical field [0001] The invention relates to an illumination system, an automatic optical inspection device comprising the illumination system and a method thereof. Background technique [0002] PCB (Printed Circuit Board) has a wide range of applications, such as mobile phones, telephones, televisions, computers, automobiles, copiers, printers, air conditioners and other electronic products can be found everywhere. In the PCBA (Printed Circuit Board Assembly) production process, the miniaturization and densification of components has always been a development trend. Relying on the traditional manual visual inspection method, it is impossible to perform fast, reliable and consistent appearance defect detection on densely distributed components. , virtual soldering, side standing, tombstone, anti-sticking, damage, multiple pieces, tin beads, scratches on printed circuit boards, etc.), and it is impossible to keep accurate inspection records. Faced with such a situation, ...
Claims
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IPC IPC(8): F21S8/00F21V19/00F21V5/04F21V17/00G01N21/956F21Y115/10
Inventor 程克林
Owner 上海赫立智能机器有限公司