Patent ID: 8206634

Claim:
A method for manufacturing a light guiding panel comprising: transferring a transparent substrate that is a raw material for the light guiding panel, so that the substrate passes below an outlet of an injection pipe at a predetermined speed; making a predetermined amount of minute particles contained in a container free-fall in a unit time; and forming a desired distribution of recesses formed on a surface of the transparent substrate, by mixing the free-falling minute particles with a high speed compressed fluid flow, and injecting the mixed particles on the surface of the transparent substrate being transferred, wherein the minute particles are injected through the injection pipe that has an increased width and decreased thickness from an inlet to an outlet of the injection pipe, in which the injected minute particles form a desired distribution of recesses formed on the surface of the transparent substrate and the particles are injected in a belt shape that has a long width and a thickness relatively less than the width and has a changing trend in the width direction while there is a corresponding changing trend in the distribution density of the recesses formed.