| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a projector lens capable of controlling in high precision a fine concavo-convex surface by abrasive processing or a grain pattern surface by sandblast processing, and completely controlling generation of spectral colors in the spectral color region near a cutoff line. <P>SOLUTION: A plurality of intersections E are set in a lattice shape on a spherical surface of a projector lens 4 formed with a convex part 4a. The setting range of the intersections E is set by the intersections among a plane A which includes an X axis and rotates in a prescribed range, a plane B which includes a Y axis and rotates in a prescribed range, and the spherical surface of the projector lens 4, when the X axis, the Y axis, and the Z axis (optical axis) which mutually intersect at the focal point F2 are set. The convex part 4a is defined by its height H and a size P. A radius R of the spherical surface of the convex part 4a has a value of (P<SP POS="POST">2</SP>+4H<SP POS="POST">2</SP>)/8H. <P>COPYRIGHT: (C)2013,JPO&INPIT |
