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Non-contact visual detection method for Mark positioning of mobile phone touch screen

A non-contact, visual detection technology, applied in the direction of equipment with touch panel/sensor/detector, TV, program control, etc., can solve the problems of detection station change range, low efficiency, inaccurate detection, etc., to achieve automatic Effects of detection, ease of configuration, improved reliability and stability

Active Publication Date: 2018-08-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As an important part of smart phones, mobile phone touch screens, the production pass rate of touch screens and the production quality of mobile phones play a very important role in the popularization of mobile phones. Unqualified touch screens have a difference between the Mark center point and the Circle center point. Larger, it will cause a relatively large exposure problem on the front of the product
The traditional touch screen Mark detection is a semi-automatic measurement method using detection equipment manually. There is a phenomenon that the detection position changes too much due to unstable manual placement, which leads to inaccurate detection and low efficiency. The degree of automation is not as good as that of Not stable enough

Method used

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  • Non-contact visual detection method for Mark positioning of mobile phone touch screen
  • Non-contact visual detection method for Mark positioning of mobile phone touch screen
  • Non-contact visual detection method for Mark positioning of mobile phone touch screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 The process of acquiring images

[0024] A mobile phone touch screen Mark positioning non-contact visual detection device, including an image acquisition module, a motion control module, an auxiliary equipment module, a pneumatic valve control module and a host computer module; there are two image acquisition modules, each composed of black and white Composed of industrial camera, telecentric lens, purple coaxial light source and data acquisition card, the telecentric lens is installed on the black and white industrial camera, and the purple coaxial light source is installed inside the telecentric lens; each telecentric lens is at a distance from the Mark mark on the touch screen of the mobile phone Position 1090-1100mm; Two black and white industrial cameras are connected through Gige Ethernet communication and installed in the PCI slot of the industrial control computer Data acquisition card; the motion control module is composed of relay switch, PLC and p...

Embodiment 2

[0026] Example 2 Obtain image post-processing

[0027] (1) To calibrate and calibrate the black and white industrial camera image, select a checkerboard calibration plate with a grid of 0.5mm*0.5mm, and use a nonlinear correction mode to correct perspective distortion, radial distortion and plane linear distortion; the specific steps are to place the calibration in reverse board, open the vision software, and open the real-time image modules of the two black and white industrial cameras respectively to perform image capture calibration for this device. After completion, the calibration files of the first black and white industrial camera 1 and the second black and white industrial camera 2 are generated, and the calibration files are respectively loaded into the corresponding host computer module;

[0028] (2) After collecting the image and searching for the template, use the positioning function to train the image features of the rough positioning of the product offline, and ...

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Abstract

The invention belongs to the technical field of detection of electronic products and discloses a non-contact visual detection method for Mark positioning of a mobile phone touch screen. According to the method, a mobile phone touch screen detection part is divided into two regions of A and B; the region A is photographed by a first black and white industrial camera for detection; the region B is photographed by a second black and white industrial camera for detection; a Mark and a Circle of the region A are photographed by the first black and white industrial camera for detection; and the Markand the Circle of the region B are photographed by the second black and white industrial camera for detection. After photographing, an image is collected by an image collection module and image information is transmitted to an upper computer module; the upper computer module processes data, detects a deviation distance between a Mark central point and a Circle center through an image processing algorithm, displays a detection result and gives out a completion signal; and then a motion control module returns to an initial position to wait for detection of a next workpiece. With the detection method, the rapid, accurate and automatic detection for Mark positioning of the mobile phone touch screen can be realized.

Description

technical field [0001] The invention belongs to the technical field of electronic product detection, and relates to a visual detection method for electronic products, in particular to a non-contact visual detection method for Mark positioning on a touch screen of a mobile phone. Background technique [0002] With the rapid development of the mobile Internet, the hardware and software technology of smartphones has been rapidly improved, and the price is also moving towards the direction of more and more civilians, making the development of smartphones in China more and more diversified, and the scope of application It is becoming more and more comprehensive and plays an extremely important role in people's intelligent life. [0003] As an important part of smart phones, mobile phone touch screens, the production pass rate of touch screens and the production quality of mobile phones play a very important role in the popularization of mobile phones. Unqualified touch screens ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041H04N23/90
CPCG06F3/0418G06F13/4221H04M2250/22H04M1/24H04M1/0266H04N17/002G05B2219/1132G05B19/05G06T2207/30164G06T2207/30204G06T7/73G06T2207/10012G06T2207/30121H04N23/56G06T7/80G06T7/74G06F3/041G06F2203/04103G06F2213/0024G06T7/0004H04N23/90G06T5/80
Inventor 张相胜王甫姜潘丰
Owner JIANGNAN UNIV
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