Prime lens
A fixed-focus lens and lens technology, which is applied in the field of fixed-focus lenses, can solve the problems of reducing the authenticity of restored images and image edge deformation, and achieve the effects of good processing and assembly tolerances, small image deformation, and good manufacturability
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Embodiment approach 1
[0056] figure 1 It is a diagram schematically showing the structure of a fixed-focus lens according to Embodiment 1 of the present invention.
[0057] In this embodiment, the FNO of the fixed-focus lens is 2.2, the total length of the lens is 15.98 mm, the diagonal field angle is 105.8°, and the aperture is located on the object side of the fifth lens L5.
[0058] The following table 2 lists the relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:
[0059]
[0060]
[0061] Table 2
[0062] Table 3 lists the aspheric coefficients of each aspheric lens in this embodiment, K is the quadric surface constant of the surface, and A, B, C, D, E, and F are respectively the fourth order, sixth order, and eighth order , 10th order, 12th order, and 14th order aspheric coefficients.
[0063] Face number K A B C D E F S3 -0.2323 7.84E-03 -7.72E-04 6.19...
Embodiment approach 2
[0067] Figure 6 It is a diagram schematically showing the structure of a fixed-focus lens according to Embodiment 2 of the present invention.
[0068] In this embodiment, the FNO of the fixed-focus lens is 2.18, the total length of the lens is 15.64 mm, the diagonal field angle is 104.8°, and the aperture is located on the object side of the fifth lens L5.
[0069] The following table 4 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:
[0070] Face number surface type R value thickness Refractive index Abbe number S0(OBJ) sphere Infinity Infinity S1 sphere 18.6743 1.2300 1.50 69.0 S2 sphere 6.7370 1.6222 S3 Aspherical 11.7780 0.7798 1.49 60.0 S4 Aspherical 3.3453 1.7987 S5 sphere -12.3657 2.1999 1.53 50.0 S6 sphere -7.2147 0.1353 S7 sphere 4.8521 1.5744 1.6...
Embodiment approach 3
[0078] Figure 11 is a schematic diagram showing the structure of a fixed-focus lens according to Embodiment 3 of the present invention.
[0079] In this embodiment, FNO of the fixed-focus lens is 2.16, the total length of the lens is 15.85 mm, the diagonal field angle is 106.9°, and the aperture is located between the fourth lens L4 and the fifth lens L5.
[0080] The following table 6 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:
[0081] Face number surface type R value thickness Refractive index Abbe number S0(OBJ) sphere Infinity Infinity S1 sphere 16.0000 0.9145 1.45 69.0 S2 sphere 4.2357 1.3215 S3 Aspherical 9.0852 1.0561 1.68 94.0 S4 Aspherical 3.4273 1.6275 S5 sphere -24.5073 0.6746 1.49 71.0 S6 sphere -13.9635 1.1014 S7 sphere 3.9258 1.9746 1.77...
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