By using the surfaceStress meterCheck the stress of the periphery of the assembled and processed glasses in the lens ring. It is required that the stress of the periphery of the lens in the lens ring is basically uniform.Generally, we can observe the following four situations: 1. Uniform stress - the periphery of the lens is semicircular and uniform 2. Stress is too strong - the periphery of the lens is in a linear shape with long sharp angles 3. Local stress is too strong - there are sharp angles and long lines around the lens 4. Too weak stress - there is almost no line image around the lens
Inspection and analysis There are two cases that can not meet the requirements through surface stress meter inspection.One is that the stress is too strong or the local stress is too strong, and the other is that the stress is too weak.The main causes of excessive stress and local excessive stress are: ① The lens is too worn. ② The shape of the lens is inconsistent with the geometric shape of the mirror ring, including the shape, position and overall shape of its edges or angles. ③ The curvature of lens is inconsistent with that of lens ring. ④ Lens edge color is not on the same line. The main reason for the weak stress is that the main reason for the whole lens is small. Therefore, during assembly and processing, it can be corrected again according to the stress inspection conditions and causes, otherwise it will cause lens edge collapse, damage or lens falling off during wearing. usage method 1. Tool: stress gauge. 2. Operation steps (1) Turn on the power supply, turn on the switch, and the light will be on. (2) Place the tested glasses between the polarizer and polarizer of the instrument. (3) The inspector can observe the stress around the lens in the lens ring from the up direction of the polarizer. (4) According to the observed stress, judge whether the stress around the lens is uniform or needs to be corrected. The above is the use and precautions of surface stress gauge shared by Shenzhen Dongyi Precision Equipment Co., Ltd