| 摘要 |
<p>An endoscope relay lens for transmitting an optical image along a narrow cylinder comprises two identical end lenses (64a,66a) affixed to opposed ends of a center lens (62a)to define a cylinder. The relay lens is symmetrical about a plane bisecting the center of the center lens. The axial length of each end lens is equal to or greater than one-half its diameter. Optimal performance characteristics are achieved when the radii of curvature of the lenses and the axial lengths of the lenses cooperate so that the distance from an object being viewed to the exterior surface of the end lens closest to the object is one-half the distance between relay lenses in a pair and one-half the distance between sets of relay lens pairs. The center lens may be spherical.</p> |
