Light diffusivity measuring apparatus and light diffusivity measuring method

摘要

PROBLEM TO BE SOLVED: To provide an optical diffusion degree measurement device capable of measuring dependency of various surface rugged shapes of a test piece on optical diffusion degree.SOLUTION: An optical diffusion degree measurement device includes: a light source 10; a light source slit 11 for forming measuring light emitted from the light source 10 onto a test piece 20; a first lens 12 for making the measuring light penetrated through the light source slit 11 hit onto the test piece 20 with the light source slit 11 being a focal surface; a second lens 13 for receiving transmitted light of the measuring light being hit onto the test piece 20 to focus the transmitted light; a variable slit 14 that is disposed between the second lens 13 and an optical receiver 15 on a focal plane of the second lens 13 and makes the width of a penetration section variable by moving a shading section; and the optical receiver 15 for receiving the measuring light penetrated through the variable slit 14.SELECTED DRAWING: Figure 1