Patent ID: 6970297

Claim:
A method for designing a lens that converts a laser beam into laser lines of uniform brightness on a planar surface, the lens having a refractive index, the method including the following steps: a. setting a length, which is taken as the length of the laser lines formed on the planar surface, with the length starting from a starting point at the lens; b. setting an altitude, which is the distance between the laser beam and the plane; c. dividing the length into a plurality of equal partitions to obtain a plurality of partition points that are spaced equi-distantly apart from each other; d. calculating a plurality of refraction angles based on the altitude and the distances between the starting point and each partition point; e. calculating a plurality of plane angles for the lens based on the refractive index of the lens and the plurality of refraction angles; and f. forming a continuous incline on the lens based on the plane angles.