| 摘要 |
PURPOSE:To make it possible to simply evaluate the surface of a film having high appearance quality such as excellent glossiness or sharpness, by detecting only reflected light forming a definite angle to an incident direction in the reflected light from a surface to be measured. CONSTITUTION:Parallel luminous flux is vertically incident to a surface 14 to be measured and the reflected light thereof is taken out of the parallel luminous flux by a translucent mirror 15 to be converged to the focal surface of a lens by a condensing lens 16 while the light intensity distribution on the focal surface is detected by a photodiode array 18. When an ftheta lens is used as the condensing lens 16, only light reflected to the same direction is separated from the other reflected light and can be detected effectively. Then, the ratio of the light intensity of the component of reflected light forming an angle of almost zero to the incident direction of parallel luminous flux in the reflected light from the surface 14 to be measured and that of the component of reflected light forming an angle of 0.5-20 deg. to the incident direction of parallel luminous flux is calculated by an amplifying operation apparatus to enable the evaluation of the appearance properties of a film. |
