Fish-eye lens
A fisheye lens and lens technology, applied in the field of optical lenses, can solve the problems of inability to meet day and night monitoring functions, lack of day and night confocal functions, and poor lens imaging quality, and achieve the effects of good imaging quality, total length, and large aperture.
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Embodiment 1
[0048] see figure 1 , shows a fisheye lens 100 provided by the first embodiment of the present invention, the fisheye lens 100 includes in sequence from the object side to the imaging surface: a first lens L1, a second lens L2, a third lens L3, and a diaphragm S7 , the fourth lens L4, the fifth lens L5, the sixth lens L6, and the filter L7.
[0049] The first lens L1 is a spherical lens with negative refractive power, the object side S1 is convex, and the image side S2 is concave;
[0050] The second lens L2 is an aspheric lens with negative refractive power, the object side S3 is concave, and the image side S4 is convex;
[0051] The third lens L3 is a spherical lens with positive refractive power, and its object side S5 and image side S6 are both convex;
[0052] The fourth lens L4 is a spherical lens with positive refractive power, and its object side S8 and image side S9-1 are both convex;
[0053] The fifth lens L5 is a spherical lens with negative refractive power, th...
Embodiment 2
[0092] see Figure 5 , which is a schematic structural diagram of the fisheye lens 200 in the second embodiment of the present invention. The fisheye lens 200 in this embodiment is roughly the same as the fisheye lens 100 in the first embodiment. The degree of unevenness of the surface of each lens is different.
[0093] At the same time, the relevant parameters of each lens of the fisheye lens 200 in this embodiment are different from the relevant parameters of each lens of the fisheye lens 100 in the first embodiment.
[0094] Please refer to Table 3, which shows the relevant parameters of each lens of the fisheye lens 200 in this embodiment.
[0095] table 3
[0096]
[0097]
[0098] Please refer to Table 4, which shows the relevant parameters of the aspheric surface of the fisheye lens 200 in this embodiment.
[0099] Table 4
[0100]
[0101] see Image 6 , shows the field curvature curve of the fisheye lens 200 in the present embodiment; please refer to Fi...
Embodiment 3
[0104] see Figure 9 , is a schematic structural diagram of the fisheye lens 300 in the third embodiment of the present invention. The fisheye lens 300 in this embodiment is roughly the same as the fisheye lens 100 in the first embodiment, except that the last piece of The shape of the spherical surface is different. The sixth lens L6 of the fisheye lens 300 in this embodiment is a biconvex aspheric lens, while the sixth lens L6 of the first embodiment is a meniscus aspheric lens with a concave surface facing the image plane. . In addition, the degree of unevenness of the surface of each lens is different.
[0105] At the same time, the relevant parameters of each lens of the fisheye lens 300 in this embodiment are different from the relevant parameters of each lens of the fisheye lens 100 in the first embodiment.
[0106] Please refer to Table 5, which shows the relevant parameters of each lens of the fisheye lens 300 in this embodiment.
[0107] table 5
[0108]
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