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

Claim 19:
20. 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 systemare 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 eyepiece system omprises a III-1 lens, a III-2 lens, and a III-3 lens;
wherein the III-1 fens is with negative refractive power and comprises a concave surface facing the object side;
wherein the III-2 lens is with positive refractive power and comprises a convex surface facing the image side;
wherein the III-3 lens is a biconvex lens with positive refractive power and comprises a convex surface facing the object side and another convex surface facing the image side.