Auto-focus system and method and optical imaging inspection apparatus
An automatic focus and instrument technology, applied in the field of image detection equipment and automatic focus system, can solve the problem that the object under test cannot be controlled within the depth of field, achieve accurate centroid position, and reduce the effect of the center of mass being left and right
Active Publication Date: 2018-03-09
UTECHZONE CO LTD
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Problems solved by technology
In the process of conveying, it is desired to detect the object. Due to the effect of air floatation, the object will be suspended above the stage, and the height of the suspension will float within a certain range (for example, 300um). Since the depth of field of a general camera is only 35um, it cannot Precisely control the object under test within the depth of field
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[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.
[0038] figure 1 It is a preferred embodiment of the image inspection apparatus 100 of the present invention, which is used to take an image of the surface of an object 4 and perform defect detection according to the imaged result, so as to find out the defects existing on the object 4 . The image detection instrument 100 includes an auto-focus system 1 , an image capturing unit 2 , an illumination unit 3 and an image detection unit 20 . Wherein, the auto-f...
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The invention discloses an auto-focus system and method and an optical imaging inspection apparatus employing the same. The auto-focus system mainly includes a linear light source, an objective lens,a light shielding component, an image sensing device, and a focus adjustment module. The linear light source is used to generate a linear light spot. The objective lens is used to receive a portion ofthe linear flare and project the portion of the linear flare to an object. The light blocking member is disposed on the optical path between the linear light source and the objective lens to partially block the linear light spot so that only the portion of the linear light spot enters the objective lens. The image sensing device is used for capturing the portion of the object and the linear lightspot, thereby obtaining a target image. In addition, the focus adjustment module determines the focus state of the object according to the length, width, and position of the portion of the linear spot in the target image, so as to adjust the distance between the objective lens and the object.
Description
technical field [0001] The invention relates to an automatic focus technology, especially an automatic focus system and method capable of achieving rapid focus, and an image detection instrument using the two. Background technique [0002] Traditional precision inspection usually includes an optical instrument (such as line scan camera, area scan camera, etc.) to capture images of the surface of the object, and then use computer image processing technology to detect defects such as foreign objects or abnormal patterns. However, in some cases, the object is not statically captured by the detection instrument, but will appear to be floating, and once the position changes, it will be out of focus. [0003] For example, when inspecting precision objects (such as panels), in order to avoid defects caused by scratches or stains on the conveyor belt during the conveying process, some precision objects will be equipped with an air bearing platform to make the objects float and Avoi...
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IPC IPC(8): G01N21/88
CPCG01N21/8806
Inventor 黄家麟
Owner UTECHZONE CO LTD