Patent ID: 8974086
Filing Date: 2015-03-10
Classification: B29D,C03B,G02B,Y10T

Abstract:
1. A lens used for a line generating optical system which generates a line using light from a light source, wherein; X-axis is defined in longitudinal direction of the generated line, Y-axis is defined in width direction of the generated line and Z-axis is defined in direction of the optical axis and wherein; the light source and the lens are arranged along Z-axis such that lights emitted by the light source travel along Z-axis and pass through the lens to generate the line and wherein; the lens has an optical surface which does not collimate the light in X-axis direction and which collimates or collects the light in Y-axis direction alone, the optical surface being a free form surface, and wherein; the optical surface is formed using a mold which has been machined with a tool, inclination of direction of transferred tool mark with respect to X-axis being from 40 degrees to 50 degrees in an area of 80% or more of the optical surface when the lens is arranged in the line generating optical system.