Curved glass profile error detection method
A technology of curved glass and detection method, which is applied to measurement devices, instruments, optical devices, etc., can solve problems such as failure to meet detection requirements, standard curve error, curve deformation and distortion, etc., and achieve the effect of cost and technical improvement
Active Publication Date: 2018-06-29
SUZHOU YIMEIDE TECH CO LTD
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Problems solved by technology
For the measurement of the profile of curved glass, the current main device is to use a three-coordinate measuring machine, which has low measurement efficiency and can only be used for random inspection, which does not meet the full inspection requirements of mass production of curved glass
[0003] At present, the non-contact displacement sensor is used to detect the glass surface, and the points collected by the spectral confocal laser sensor are generally used to directly fit the curve and compare it with the standard curve. In this way, the parallelism between the spectral confocal laser sensor motion trajectory and the glass plane is extremely high. , if the parallelism cannot be guaranteed, then the curve fitted by the points collected by the sensor will be deformed and distorted, and there will be a large error with the standard curve, or even fail to meet the detection requirements
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[0023] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0024] Please refer to Figure 1 to Figure 2 , the invention provides a method for detecting the profile of curved glass, comprising the following steps:
[0025] Step 1: Provide a curved glass 1, divide the curved glass 1 into a plane part 12 and a curved part 11, and use a spectral confocal laser sensor to collect points on the curved glass 1 to fit and define a reference surface O. The method for defining the reference surface is: The critical straight line is moved twice toward the plane part, and points between the straight lines obtained by the two shifts are collected for polynomial fitting to obtain the reference plane.
[0026] Please refer to figure 2 , to establish a two-dimensional coordinate system, figure 2 Then it i...
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A curved glass profile error detection method provided by the invention does not need to ensure the high parallelism of a motion track of a sensor and a glass plane portion. The method employs pointscollected at the glass plane portion through a spectrum confocal sensor to fit a surface as a reference surface, and compares distances between some points, on the curve, fitted by the collection points on the curve surface portion through the spectrum confocal sensor to detect whether the glass curve surface profile error achieves a standard or not so as to greatly improve the cost and the technology.
Description
technical field [0001] The invention relates to the field of machine vision, in particular to a method for detecting the profile of curved glass. Background technique [0002] Curved glass is the current development trend of smart phones and some electronic wearable devices, and the market demand is increasing day by day. The curved surface profile, glass thickness, and flatness of curved glass itself are important precision indicators of curved glass, which require key control during the production process. For the measurement of the profile of curved glass, the current main device is to use a three-coordinate measuring machine, which has low measurement efficiency and can only be used for random inspection, which does not meet the full inspection requirements of mass production of curved glass. [0003] At present, the non-contact displacement sensor is used to detect the glass surface, and the points collected by the spectral confocal laser sensor are generally used to d...
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IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 靳登科孙文政李庆冬雷海涛
Owner SUZHOU YIMEIDE TECH CO LTD