US 12,435,974 B2
Multilayer film measuring device and multilayer film measuring method
Ling-Kuei Hung, Miaoli County (TW); Jiang-Yun Zhou, Miaoli County (TW); Hung-Chuan Mai, Miaoli County (TW); and Sheng-Chun Chuang, Miaoli County (TW)
Assigned to Interface Technology (ChengDu) Co., Ltd., Chengdu (CN); Interface Optoelectronics (ShenZhen) Co., Ltd., Shenzhen (CN); and General Interface Solution Limited, Miaoli County (TW)
Filed by Interface Technology (ChengDu) Co., Ltd., Sichuan (CN); Interface Optoelectronics (ShenZhen) Co., Ltd., Guangdong (CN); and General Interface Solution Limited, Miaoli County (TW)
Filed on May 16, 2023, as Appl. No. 18/197,832.
Claims priority of application No. 202310488962.5 (CN), filed on May 4, 2023.
Prior Publication US 2024/0369354 A1, Nov. 7, 2024
Int. Cl. G01B 11/30 (2006.01)
CPC G01B 11/303 (2013.01) 9 Claims
OG exemplary drawing
 
1. A multilayer film measuring device, comprising:
a measuring module, having a projection port and a receiving port on one side thereof, the measuring module further including a light source unit, the light source unit being located corresponding to the projection port for generating a laser beam;
a multilayer film to be measured, having a first waveplate and a reflective polarizer, wherein the first waveplate is closer to the measuring module than the reflective polarizer;
a circular polarization module, located between the measuring module and the multilayer film to be measured, the circular polarization module having a second waveplate and a second linear polarizer, wherein the second linear polarizer is closer to the measuring module than the second waveplate;
wherein when the light source unit projects the laser beam from the projection port, the laser beam passes through the circular polarization module to the multilayer film to be measured, the reflective polarizer completely reflects the laser beam through the circular polarization module to the receiving port, and the laser beam shifted by a surface of the first waveplate is absorbed by the second linear polarizer.