| 摘要 |
PURPOSE:To miniaturize an eyepiece, by fixing a viewfield lens with an internal focus type eyepiece to exchange the eyepiece and varying the magnification ratio. CONSTITUTION:An eyepiece consists of a viewfield lens 2, an eye lens 3 and a focal plate 4. Both the lens 2 and the plate 4 are fixed, and the lens 3 is exchanged with an eye lens 3' or 3'' having different magnification ratios. Thus an eyepiece is obtained with different magnification ratios. An image formed by an objective lens 1 is formed on the plate 4 through the lens 2. Accordingly the position has no change for the images formed on the plate 4 through the lens 1. These images are observed through either one of eye lenses 3, 3' and 3'' with different magnification ratios in accordance with the eye lens. However, no exchange is required for the plate 4 since the images formed on the plate 4 are quite equal to each other. |
