Telescope and telescope series
AssigneeAsia Optical Co., Inc.
InventorShogo Okubo
Life of this patent
Estimating the term…
Abstract
A relay optical system (RL) of this telescope has arranged therein, in the following order from the object side: a first lens group (G1) having positive refractive power; a second lens group (G2) having positive refractive power; a third lens group (G3) having positive refractive power; a fourth lens group (G4) having negative refractive power; and a fifth lens group (G5) having positive refractive power, wherein the magnification of the telescope can be changed by causing an image formed on a first image plane (IM1) to be re-formed on a second image plane (IM2) and further causing the second lens group (G2) and the third lens group (G3) to move along the optical axis, and thereby varying the image-forming magnification of the relay optical system (RL).
Claims19
A telescope comprising:
- an objective lens system;
- a relay lens system;
- and
- an eyepiece system;
- wherein the objective lens system, the relay lens system, and the eyepiece system are arranged in order from an object side;
- wherein the relay lens system comprises a first lens group having positive refractive power, a second lens group having positive refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power, all of which are arranged in order from the object side, wherein an image is formed by the objective lens system;
- wherein the second lens group and the third lens group move along an optical axis to change the image magnification of the relay lens system.
A telescope series comprising:
- a first telescope;
- and
- a second telescope;
- wherein the first telescope comprises a first objective lens system, a first relay lens system, and a first eyepiece system, all of which are arranged in order from an object side;
- wherein the second telescope comprises a second objective lens system, a second relay lens system, and a second eyepiece system, all of which are arranged in order from the object side;
- wherein the first relay lens system comprises a first lens group having positive refractive power, a second lens group having positive refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power, all of which are arranged in order from the object side, wherein an image is formed by the first objective lens system;
- wherein the second lens group and the third lens group move along an optical axis to change the image magnification of the first relay lens system;
- wherein the second relay lens system is composed of the same lens group as the first relay lens system and an image formed by the second objective lens system is reimaged on an image plane which is between the second relay lens system and the second eyepiece system;
- wherein the magnification of the second telescope can be changed by moving the second lens group and the third lens group along the optical axis to change the image magnification of the second relay lens system.
Dependencies are inferred from the claim text.