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.

Active Publication Date: 2020-01-03
合肥联创光学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fisheye lenses used in the surveillance field usually require good imaging quality under both visible light and infrared light conditions, and can achieve clear and bright surveillance images even under low illumination at night.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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]

[01...

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Abstract

The invention discloses a fish-eye lens, from the object side to the imaging side in sequence, comprising a first lens having a negative power and being a meniscus spherical lens with the concave surface facing the imaging side; a second lens having a negative power and being a meniscus aspherical lens with the concave surface facing the object side; a third lens having a positive power and beinga double convex spherical lens; a fourth lens having a positive power and being a double convex spherical lens; a fifth lens having a negative power and being a meniscus spherical lens with the concave surface facing the object side; and a sixth lens having a positive power and being a meniscus aspherical lens with the concave surface facing the imaging side or being a double convex aspherical lens, wherein the fourth lens and the fifth lens form a gluing lens. The fish-eye lens has the advantages of short total length, large image surface, wide angle, good day and night confocal performance and good imaging qulity.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to a fisheye lens. Background technique [0002] The fisheye lens is a wide-angle lens with a large outer diameter of the front lens, an extremely short focal length, and a field of view of more than 170°. Due to the advantage of a large field of view, the fisheye lens is generally widely used in security monitoring and panoramic cameras. , sports cameras and vehicle-mounted camera fields. [0003] At present, with the continuous development of optical technology, the structure and performance of fisheye lenses are constantly improving. Fisheye lenses used in the surveillance field usually require good imaging quality under visible light and infrared light conditions, and can achieve clear and bright surveillance images even under low illumination at night. However, most of the existing fisheye lenses do not have day and night The confocal function cannot meet the day and n...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/06G02B13/14G02B13/18
CPCG02B13/0045G02B13/006G02B13/008G02B13/06
Inventor 高博李伟娜黄健新韩建
Owner 合肥联创光学有限公司
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