United States Patent of Glass Surface Stress Meter and Multiple-tempered Glass Surface Stress Meter

Patent No.: US 11,060,930 B2

Owner: Suzhou PTC Optical Instrument

As we known, a tempered glass is also called a reinforced glass. It is a kind of prestress glass. And it off- sets the surface stress when bearing an external force, thus, carrying capacity is improved. As a result, tempered glass is widely used in building door and windows, automobile door and windows, display industry and various electronic instruments. With the touch panel to achieve the application effect by the operation method that press external pressure to react the assembly, a mechanical anti-pressure becomes to be important regulations and index to major manufacturers .

In addition, although the bearing capacity has been improved after the glass is tempered. The stress is usually extremely uneven that will reduce the mechanical strength and thermal stability which will affect the safety and even lead to self-explosion. Especially with a flourish development of the touch industry, the mechanical anti-pressure becomes an important regulation and index for various manufacturers. Large stress influence the optical light transmission and imaging quality for optical glass seriously.

The invention of glass surface stress meter and multiple-tempered

Surface Stress Meter solve the problem in the prior art that glass surface stress is hard to test.

When PTC’s present invention is used to test the multiple-tempered glass surface stress ,drop few refracting liquid on the refracting prism surface through the automatic dripping device, then place the measuring glass on the refracting prism .The light enters into the imaging lens to image identification after the light reflected with by the refracting prism. The recognized image is converted into the digital signal with the glass surface stress information through the sensor ,and achieves the final stress calculation by the data processing element at last. Due to the multiple optical path system design is adopted in the present invention, the angle of the light source ,lens and the imaging tubes could be adjusted at the same time through the light source height adjusting device, lens adjust structure and angle adjustment of the imaging lens tube to result at last one quite clear interference fringe in each light path. In this way , the image recognition of the one and multiple strengthened interference fringes can be carried out at the same time without mutual influence ,and the measuring precision and effect is improved.