Long-wave infrared zoom lens unit
A zoom lens and long-wave infrared technology, applied in the field of long-wave infrared zoom lenses, can solve the problems that the details of objects cannot be clearly displayed, the range of temperature changes in the use environment is small, and there is no super wide field of view, and the thermal expansion coefficient can be achieved. Small, reduce the phenomenon of image plane drift, and compensate the effect of thermal difference
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Embodiment 1
[0078] The focal length of the long-wave infrared zoom lens of the present invention is ft=8-12mm, and the F number of the optical system is FNO=1.1. The focal length of the first lens 1 is f1=-25.29mm; the focal length of the second lens 2 is f2=-50.78mm; the focal length of the third lens 3 is f3=16.74mm; the focal length of the fifth lens 5 is f5=20.85mm. BFL / ft=0.933, according to the relationship between the above-mentioned first lens 1, second lens 2, third lens 3, fifth lens 5 and the lens of the present invention, the data in Table 1 is calculated.
[0079] ft=8mm
ft=10mm
ft=12mm
f1 / ft=-3.16
f1 / ft=-2.53
f1 / ft=-2.11
f2 / ft=-6.35
f2 / ft=-5.08
f2 / ft=-4.23
f3 / ft=2.09
f3 / ft=1.67
f3 / ft=1.40
f5 / ft=2.61
f5 / ft=2.09
f5 / ft=1.74
[0080] Table I
[0081] In this embodiment, the specific parameters of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are sho...
Embodiment 2
[0100] The focal length of the long-wave infrared zoom lens of the present invention is ft=8-12mm, and the F number of the optical system is FNO=1.1. The focal length of the first lens 1 is f1=-20.67mm; the focal length of the second lens 2 is f2=-24.61mm; the focal length of the third lens 3 is f3=12.03mm; the focal length of the fifth lens 5 is f5=16.78mm. BFL / ft=0.734, according to the relationship between the above-mentioned first lens 1, second lens 2, third lens 3, fifth lens 5 and the lens of the present invention, the data in Table 6 is calculated.
[0101] ft=8mm
ft=10mm
ft=12mm
f1 / ft=-2.58
f1 / ft=-2.07
f1 / ft=-1.72
f2 / ft=-3.08
f2 / ft=-2.46
f2 / ft=-2.05
f3 / ft=1.50
f3 / ft=1.20
f3 / ft=1.00
f5 / ft=2.10
f5 / ft=1.68
f5 / ft=1.40
[0102] Table six
[0103] In this embodiment, the specific parameters of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are s...
Embodiment 3
[0124] The focal length of the long-wave infrared zoom lens of the present invention is ft=8-12mm, and the F number of the optical system is FNO=1.1. The focal length of the first lens 1 is f1=-25.34mm; the focal length of the second lens 2 is f2=-74.49mm; the focal length of the third lens 3 is f3=17.11mm; the focal length of the fifth lens 5 is f5=17.29mm. BFL / ft=1.24 According to the relationship between the first lens 1, the second lens 2, the third lens 3, and the fifth lens 5 and the lenses of the present invention, the data in Table 11 are calculated.
[0125] ft=8mm
ft=10mm
ft=12mm
f1 / ft=-3.17
f1 / ft=-2.53
f1 / ft=-2.11
f2 / ft=-9.31
f2 / ft=-7.45
f2 / ft=-6.21
f3 / ft=2.14
f3 / ft=1.71
f3 / ft=1.43
f5 / ft=2.16
f5 / ft=1.73
f5 / ft=1.44
[0126] Table Eleven
[0127] In this embodiment, the specific parameters of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 ...
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