| 摘要 |
PURPOSE:To obtain good quality images of erecting images, large aperture ratios and high magnifications by disposing the 1st spherical reflection mirror, the 2nd spherical reflection mirror and a relay lens optical system on the same axis. CONSTITUTION:A through-hole 1 is pierced in the 1st spherical reflection mirror M1, which has the concave face of a radius R1 of curvature. The 2nd spherical reflection mirror M2 having the convex face of a radius R2 of curvature is disposed on the same optical axis P as the 1st reflection mirror M1. Incident light Q is reflected by the concave face of the 1st reflection mirror M1, advances to the 2nd reflection mirror M2, is further reflected by the convex face thereof, and forms the combined image Y1 of the 1st and 2nd mirrors M1, M2 against the axis P. Further, a condenser lens G1 of positive focus, a positive lens 2, G3 and G4 constituting negative lenses, G5 and G6 constituting negative lenses, and a positive lens G7 are disposed, and the combined image Y1 is inverted by the combining effect of these lenses G2-G7 to the inverted and combined image Y2 which is visible through an eyepiece lens system 2. |
