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

Claim 17:
18. The scope as claimed in claim 12, wherein:
the eyepiece system is with positive refractive power and a combination of the relay lens system and the eyepiece system is with negative refractive power;
the III-1 lens is with negative refractive power and comprises a concave surface facing the object side;
the III-2 lens is with positive refractive power and comprises a convex surface facing the image side;
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; and
the scope satisfies at least one of following conditions:

−10≤R101/TTLEYE≤−5;

1≤R101/R122≤4;

0.5≤ROBJ1/TTLOBJ≤3;

−3≤R92/TTLELMaxM≤−1;

31 3.3≤R122/TTLEYE≤−1.8;

0≤|R92/R101|0.25;

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.