Lens
A lens and lens technology, applied in the lens field, can solve problems such as small lens aperture
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Embodiment 1
[0076] image 3 The schematic diagram of the lens structure provided by the embodiment of the present invention, the focal length of the lens is 12.58 mm, the aperture Fno is 1.20, and the total length TTL of the lens is about 99.8 mm.
[0077] The data such as the radius of curvature, central thickness, refractive index nd, and Abbe constant Vd of each lens are shown in Table 1:
[0078]
[0079]
[0080] Table 1
[0081] It should be noted that the face numbers in Table 1 are figure 1 In the schematic diagram of the lens structure shown, the surface numbers of the lenses are from left to right.
[0082] According to the data in Table 1 and related formulas, it can be obtained: f2=24.65mm; NL=13; |f2 / f system|=1.96; (TTL*Fno*Fno*NL*NL) / 20000=1.21; nd5=2.051 ;nd10=1.804; Vd3=61.25; Vd4=68.62; Vd6=68.62; Vd12=68.62.
[0083] The lens provided in the first embodiment will be further introduced below through a detailed optical system analysis of the first embodiment.
...
Embodiment 2
[0087] Figure 5 The schematic diagram of the lens structure provided by the embodiment of the present invention, the focal length of the lens is 12.13 mm, the aperture Fno is 1.02, and the total length TTL of the lens is 138 mm.
[0088] The data such as the radius of curvature, central thickness, refractive index nd, and Abbe constant Vd of each lens are shown in Table 2:
[0089]
[0090]
[0091] Table 2
[0092] According to the data in Table 2 and related formulas, it can be obtained: f2=21.65mm; NL=13; |f2 / f system|=1.78; (TTL*Fno*Fno*NL*NL) / 20000=1.21; nd5=2.003 ; nd10 = 1.804; Vd3 = 81.56; Vd4 = 68.35; Vd6 = 68.35; Vd12 = 68.35.
[0093]The lens provided by the second embodiment will be further introduced below by analyzing the optical system of the second embodiment in detail.
[0094] Figure 6 is the transfer function (MTF) curve, the curve is smoothly descending and concentrated. At 140lp / mm, the MTF value within the image height of 7.48mm is greater th...
Embodiment 3
[0096] Figure 7 It is a schematic diagram of the structure of the lens provided by the embodiment of the present invention. The focal length of the lens is 12.5 mm, the aperture Fno is 1.02, and the total length TTL of the lens is 118 mm.
[0097] The data such as the radius of curvature, central thickness, refractive index nd, and Abbe constant Vd of each lens are shown in Table 3:
[0098]
[0099]
[0100] table 3
[0101] According to the data in Table 3 and related formulas, it can be obtained: f2=21.99mm; NL=14; |f2 / f system|=1.76; (TTL*Fno*Fno*NL*NL) / 20000=1.20; nd5=1.923 ;nd10=2.003; Vd3=81.56; Vd4=68.62; Vd6=68.62; Vd12=68.62.
[0102] In the following, the lens provided in the third embodiment will be further introduced by analyzing the optical system of the third embodiment in detail.
[0103] Figure 8 is the transfer function (MTF) curve, the curve is smoothly descending and concentrated. At 140lp / mm, the MTF value within the image height of 7.48mm is ...
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