| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical lens which is constituted compactly and optionally changes the size of an annular irradiation pattern or photodetection pattern, and to provide an illuminator and a photodetector using the optical lens. <P>SOLUTION: The optical lens 12 has a convex lens portion 12a as a body of rotation, which is made of a transparent material, disposed around a center axis O, formed in a cross section passing through the center axis and on an inclined axis A extending at a predetermined angle θ from a focus position F on one side of the center axis at a predetermined distance, and rotated around the center axis and defined. <P>COPYRIGHT: (C)2009,JPO&INPIT |
