| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a planetarium projector which is advantageous in size reduction with a simple configuration. <P>SOLUTION: A planetarium projector 14 projects a whole sky screen image on a dome screen 12, includes a convex mirror 16 and a projector 17, and makes projection light from the projector 17 reflected on the convex mirror 16 to thereby project the reflected light on the dome screen 12. A reflecting surface 16a of the convex mirror 16 is a free curved surface which is axially symmetrical with respect to an optical axis of a projection lens 19, and has such a shape as to equalize respective optical lengths of projection light which is emitted from the projection lens 19 and is directed to the respective positions of the dome screen 12. <P>COPYRIGHT: (C)2012,JPO&INPIT |
