When we observe the tempered glass at a certain distance and angle under a certain lighting condition, we will look at the tempered glass surface with irregularly distributed colored markings, so that the colored markings are our Usually referred to as "stress spots."

Tempered glass pressure spot / stress spots

Although the existence of stress spots does not affect the reflection of the glass (without reflection distortion), it does not affect the transmission of the glass (without affecting the resolution and without optical distortion). It is an optical feature of all tempered glass and is not a quality problem or a quality defect in the manufacture of toughened glass by handset manufacturers of tempered film.

However, tempered glass as a safety glass, its scope of application has become more and more widespread, people are more and more demanding on the appearance of glass, especially when used as a large area of the curtain wall tempered glass stress will give The appearance of glass has a very negative impact, and even affect the overall appearance of the building effect, so people are more and more concerned about stress spots.

All transparent materials can be divided into isotropic materials and anisotropic materials. When light passes through the isotropic material, the speed of light is the same in all directions, and the exit and incident light do not change. An annealed glass is an isotropic material. When the light through the heterosexual material, the incident light will be divided into two at different speeds and have different distances of the rays, the outgoing light and incident light changes, poor annealed glass, including tempered glass belongs to the direction Heterosexual material.

As a heterogeneous materials, tempered glass, for the phenomenon of stress spots Phone tempered membrane manufacturers wholesalers can use the principle of photoelastic to explain for everyone: When a bunch of polarized light through the tempered glass, because of the internal glass Permanent stress (steel stress), then this beam will be split into two beams of different speeds of transmission of polarized light, that is, light and slow light, also known as birefringence phenomenon.

When two beams of light form at one point intersect the beam of light formed at a different point, there will be a phase difference at the point of intersection of the beams because of the difference in the speed of light propagation, at which point both beams interfere Phenomenon, when the two beams of light in the same direction of amplitude, the light intensity will be strengthened to produce a bright field of view, that is, bright spots; when the opposite direction of light amplitude, the light intensity will be reduced to produce dark field, that is, dark spots . As long as the tempered glass in the plane direction there is a stress distribution uneven phenomenon will produce stress spots.

In addition, the reflection of the glass surface will make the reflected light and transmission have a certain polarization effect, the light into the interior of the glass is actually only light with polarization effect, which is the mobile phone manufacturers wholesalers of steel membrane manufacturers Why do you see the light and dark streaks or stripes of the truth.