| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical measuring instrument capable of always keeping a light detection region constant even in a case that the distance from a light source to a measuring target varies, capable of avoiding the effect of a change in the distance and capable of preventing stray light from the outside of a measuring area from being thrown to cause an error to enhance measuring precision. <P>SOLUTION: The optical measuring instrument includes the light source for illuminating the measuring target, a photodetector for detecting the light reflected from the measuring surface of the measuring target and an aperture part having an aperture part for restricting the illumination light thrown on the measuring surface of the measuring target and the reflected light reflected from the measuring surface of the measuring target to be detected by the photodetector and constituted so that the measuring target is optically measured in a non-contact state without being brought into contact with the measuring surface of the measuring target. The aperture member is constituted of a first aperture member for determining the illumination region with respect to the measuring surface of the measuring target and a second aperture member for determining the measuring area of the reflected light reflected from the measuring surface of the measuring target to be thrown on the photodetector. <P>COPYRIGHT: (C)2007,JPO&INPIT |
