Patent ID: 9682458
Date: 2017-06-20
CPC Classifications: B24B

Claim:
1. A method for controlling a grinding of a flexible substrate, comprising: grinding an etching side of the flexible substrate; irradiating the flexible substrate with infrared rays or near infrared waves of near infrared rays emitted by an infrared sensor, receiving waves reflected by a side opposite to the grinding side and waves reflected by the grinding side of the flexible substrate respectively, and calculating a distance from the grinding side to the side opposite to the grinding side of the flexible substrate based on the received waves reflected by the side opposite to the grinding side and the received waves reflected by the grinding side of the flexible substrate, wherein, emitting the infrared rays or the near infrared rays with different wavelengths and same light intensity at non-overlapping time sequences by a plurality of sub light sources of the infrared sensor; collecting infrared images formed by the infrared rays or the near infrared rays with the different wavelengths reflected by the flexible substrate at different timings; accumulating the light intensity of each pixel in the infrared image collected regarding the different wavelength to obtain an overall light intensity of the image; and comparing the overall light intensities obtained regarding different wavelengths with each other, and calculating the distance from the grinding side to the side opposite to the grinding side of the flexible substrate based on the maximum value of the differences of any two of the overall light intensities; comparing the distance from the grinding side to the side opposite to the grinding side of the flexible substrate with a predetermined thickness of the flexible substrate, and controlling an extent of grinding by a grinding device based on a difference of the distance from the grinding side to the side opposite to the grinding side of the flexible substrate and the predetermined thickness of the flexible substrate.