Eyepiece system
AssigneeOlympus Optical Co., Ltd.
InventorsMasashi Hankawa, Tomoko Sato
Life of this patent
Estimating the term…
Abstract
An eyepiece system which is configured for observing an image formed by an objective lens system and comprises, in order from a side, of the objective lens system, a first lens element having at least one aspherical surface and a concave surface on the side of the objective lens system, at least one biconcave lens element and at least one positive lens element.
Claims15
An eyepiece for observation of an image formed by an objective lens system comprising, in order from a side of said objective lens system:
- a first lens element which has at least a positive refractive power and at least one aspherical surface;
- at least one negative lens element;
- and
- at least one positive lens element,
- wherein said first lens element satisfies the following condition:
- N.sub.d1 <1.5, 62>.upsilon..sub.d1 >54
- wherein the reference symbol N.sub.d1 represents a refractive index of said first lens element and the reference symbol .upsilon..sub.d1 designates an Abbe's number of said first lens element.
An eyepiece system comprising, in order from a side of an objective lens system, a first positive meniscus lens element having a convex surface on a side of an observer's eye, a cemented lens component consisting of a second biconcave lens element and a third biconvex lens element, and a fourth positive lens element.
An eyepiece system for observation of an image formed by an objective lens system comprising, in order from a side of said objective lens system;
- a first lens element having at least one aspherical surface and a concave surface on the side of said objective lens system;
- a second biconcave lens element having a negative refractive power,
- a third biconvex lens element and
- a fourth single lens element which has a positive refractive power and a convex surface arranged such that a curvature of an objective lens side surface of said fourth lens element is greater than that of an eye side surface thereof,
- wherein said image formed by said objective lens system is formed on an objective lens side of said first lens element of said eyepiece;
- and
- said second lens element is cemented to said third lens element to form a cemented lens component.
An eyepiece system for observation of an image formed by an objective lens system, comprising a plurality of lens elements, wherein a lens element of said plurality of lens elements is disposed on a! an objective lens side, is made of a synthetic resin material and has a positive refractive power, and the following condition (3) is satisfied:
- (3) 2<f.sub.0 /f.sub.E
- wherein the reference symbol f.sub.0 represents a focal length of said objective lens system and the reference symbol f.sub.E designates a focal length of said eyepiece system, and a surface of the lens element made of said synthetic resin material has a coating that is an antistatic and antireflection coating.
Dependencies are inferred from the claim text.