Patent ID: 11971603
Assignee: ASIA OPTICAL CO., INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A scope comprising:
an objective lens system which is with refractive power;
a relay lens system which is with refractive power and comprises a first lens group, a second lens group, and a third lens group; and
an eyepiece system which is with refractive power;
wherein the first lens group is with positive refractive power;
wherein the second lens group comprises a II-2-1 lens and a II-2-2 lens, and both of which are cemented and the II-2-1 lens is a meniscus lens;
wherein the third lens group comprises a II-3-1 lens having a convex surface facing an object side and a II-3-2 lens having a convex surface facing an image side, and both of which are cemented;
wherein the second lens group and the third lens group can move along an optical axis to change a magnification of the relay lens system and thereby change a magnification of the scope;
wherein the objective lens system, the relay lens system, and the eyepiece system are arranged in order from the object side to the image side along the optical axis;
wherein the first lens group, the second lens group, and the third lens group are arranged in order from the object side to the image side along the optical axis;
wherein the II-2-1 lens, the II-2-2 lens, the II-3-1 lens, and the II-3-2 lens are arranged in order from the object side to the image side along the optical axis;
wherein the scope satisfies at least one of following conditions:

−10≤R101/TTLEYE≤−5;

0.5≤ROBJ1/TTLOBJ≤3;

−3≤R92/TTLELMaxM≤−1;

−3.3≤R122/TTLEYE≤−1.8;

wherein R101 is a radius of curvature of an object side surface of the lens closest to the object side in the eyepiece system, TTLEYE is an interval between the object side surface of the lens closest to the object side to an image side surface of the lens closest to the image side along the optical axis in the eyepiece system, R122 is a radius of curvature of the image side surface of the lens closest to the image side in the eyepiece system, ROBJ1 is a radius of curvature of an object side surface of the lens closest to the object side in the objective lens system, TTLOBJ is an interval from the object side surface of the lens closest to the object side to an image side surface of the lens closest to the image side along the optical axis in the objective lens system, R92 is a radius of curvature of an image side surface of the lens closest to the image side in the relay lens system, and TTLELMaxM is an interval from an object side surface of the lens closest to the object side to the image side surface of the lens closest to the image side along the optical axis in the relay lens system when the magnification of the relay lens system is at maximum.