| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-performance image-formation optical system which is miniaturized and thinned by folding an optical path by the use of a reflection surface on which the number of reflecting times is small. SOLUTION: This optical system is provided with a 1st prism 10 on the object side and a 2nd prism 20 on the image side and is formed by an image- formation system which does not form an intermediate image. The 2nd prism 20 is provided with a 1st surface 21 making luminous flux incident, a 2nd surface 22 reflecting the incident luminous flux inside the prism, a 3rd surface 23 reflecting the reflected luminous flux inside the prism and a 4th surface 24 emitting the luminous flux to the outside. At least either of the 2nd surface and the 3rd surface 23 has a rotationally asymmetric curved surface shape to give power to the luminous flux and correct the aberration caused by an eccentricity. Furthermore, the 1st prism 10 is provided with at least one reflection surface 12 reflecting the luminous flux inside the prism and the reflection surface 12 has a rotationally asymmetric surface shape to give the power to the luminous flux and correct the aberration caused by an eccentricity.
|
