Multi-layer synchronous measurement method for curved surface light-transmitting piece

Abstract

The invention relates to a multi-layer synchronous measurement method for a curved surface light-transmitting piece. The method comprises the following steps: fixing a to-be-measured curved surface light-transmitting piece on a horizontal displacement table, and collecting images; performing closed operation on the images, and filling small holes in an upper contour; performing open operation on the images, and removing burrs on the images; enabling each image to present an upper contour and a lower contour of the curved surface light-transmitting piece, and extracting corresponding pixel positions of the upper contour and the lower contour in the image; substituting the extracted pixel coordinates into a calibration relational expression; and processing the plurality of images to obtain three-dimensional information of the whole to-be-measured piece.

Description

technical field [0001] The invention relates to a double-layer synchronous measurement technology of a curved light-transmitting screen based on laser scanning Background technique [0002] There are many examples of curved light-transmitting screens in life, such as mobile phone screens, optical glass, etc. Taking the mobile phone screen as an example, with the continuous increase of its application requirements and the continuous improvement of processing technology, the mobile phone screen is no longer just the shape of flat glass in the past, but is developing towards hyperboloid, four-curved or even octa-curved surfaces. In the manufacturing process of mobile phone curved screens, it is inevitable that the positioning of some functional holes is not accurate or the thickness of the mobile phone screen is uneven. Therefore, before automatic assembly, it is often necessary to check the key structure and screen thickness Detection is performed to avoid a great impact on t...

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Problems solved by technology

[0004] (1) From the perspective of whether the function is realized or not, the capacitive sensing method and the fluorescent immersion method can certainly detect the thickness of the glass, but the measurement task cannot be completed due to the limitation of the measurement principle of the curved surface structure.

[0005] (2) From the perspective of work efficiency, the polychromatic confocal method is measured by point scanning. For the penetrating part with a large surface to be measured, the measurement takes a long time. In addition, for the measurement of the curved surface, it is necessary to couple the rotary axis. Only by rotating the screen of the mobile phone under test can the scanning of the curved surface be realized, which will further reduce the work efficiency; also for contact measurement, such as Keyence’s contact sensor, two probes are used to measure the thickness. scan separately

This will undoubtedly increase the cost of measurement

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