| 摘要 |
PROBLEM TO BE SOLVED: To provide a reflection and refraction type macro projection optical system which shortens the overall length from a light beam incidence part to an image plane position, is inexpensive and easy to assemble, and can form high resolution with wide image size as a macro projection optical system which projects an image of a body on a photosensitive body such as a solid-state image pickup element and a film with high magnification of the image. SOLUTION: A reflecting surface and a translucent surface are formed on the same surface and optical elements are constituted on the top and reverse surfaces of one lens. Further, this reflection and refraction type macro projection optical system is made small-sized by shortening the overall length from the light beam incidence part to the image plane position since the spherical coma can be corrected at the same time by making at least two of four constituted surfaces in total aphserical and shortening the interval between reflectors as 2nd and 3rd surfaces and the curvature of field can be corrected by making a 4th surface in the center of the optical axis convex to the light incidence side and giving intense negative power, is inexpensive and easy to assemble, and can actualize high resolution with a wide image size.
|
