The reflective mark has the retro-reflective function which returns the reflection light to the light source direction. (Retro-reflective is special reflection structure in the optics. It is the reflection phenomenon in which the incident light is returned in the incident direction.)

 

Structurally, the reflective mark is the thickness of 100 to 300 µm thin and flexible sheet which consists of large number of micro high refractive glass bead (100 µm in diameter) inside the resin connection. The beads are uniformly arranged to obtain a certain effect. Each glass bead is a perfect circle ball and works as a convex lens. The incident light is passed through the glass body and refracted to focus on a point. The reflection layer is made in the bottom part of the ball and the light is passed through the glass body to return to the original light source direction.

 

The structure of the reflective mark

 

The system of the reflective mark