Device for continuously inspecting surface of object

Abstract

Abstract PURPOSE: To measure the smoothness of surface of a long broad belt-shaped material optically without the affection of vertical movement caused by a changes of tension and temperature by changing the angle of inclination of parallel optical elements arranged in the course of light beam. CONSTITUTION: The laser beam 13 from the light source 1 is applied to the object 9 to be inspected, which is made contact with the conveyer roller 10 and bent at it while conveyed, in a fixed direction. That is, the beam 13 is reflected by the plane mirror 4 through the half-mirror 3, and scans the surface of object by means of the rotary polygonal mirror 5 through the convex lens 8. The scanning light is converged to the receiver 12 by the convex lens 11. A change of the quantity of light is detected by the receiver 12, the splitted light by the half-mirror 3 is detected by the phototransistors 6, 7 to obtain a synchronous pulse, only a signal in the desired area of the light quantity change signal is taken and compared with a reference value to check itself. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Hisashi Kudo

Bibliographic Details