Patent ID: 11906718
Assignee: SOOCHOW UNIVERSITY
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. The wide-aperture spherical primary mirror off-axis afocal optical system of claim 1, wherein a rise z of the secondary mirror satisfies the following expression:

z=(cr2)/{1+[1−(k+1)(c2r2)]1/2}+Ar4+Br6+Cr8 

where A, B and C are respectively quartic, sextic and octic aspherical coefficients, c is a curvature at a center of an optical surface, r is a vertical distance between a point on an aspherical curve and an optical axis, and a conic coefficient and the aspherical coefficients of the secondary mirror 2 satisfy the relational expressions of:

9.5K11.96

1.22E−9A1.78E−9

1.10E−14B1.85E−14

2.20E−19C6.05E−19.