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Optical lens

An optical lens and optical length technology, applied in the field of optical lenses, can solve the problems of large overall field of view and short focal length of the lens, and achieve the effect of small field of view on the object side, good observation, and long focal length

Active Publication Date: 2016-02-24
NINGBO SUNNY AUTOMOTIVE OPTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing Chinese patent document CN204229034U adopts an optical system with five lenses. Although the performance is good in all aspects, the focal length of the lens is relatively short and the overall field of view is relatively large, which lacks the requirements for distinguishing the details of the road surface. , There is still room for further improvement in terms of resolution in the high-frequency region

Method used

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Experimental program
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Effect test

Embodiment 1

[0049] An optical lens, from the object side to the image side, sequentially includes a first lens L1 with a positive refractive power and a convex surface facing the object side, a meniscus-shaped second lens L2 with a convex surface facing the object side, and a biconcave third lens L3 , a fourth lens L4, a fifth lens L5, and a sixth lens L6 with positive refractive power.

[0050] Fifth lens L5 and sixth lens L6 are not necessarily required to have positive refractive power.

[0051] The first lens L1 satisfies the following formula:

[0052] 0.5≤F1 / F≤8.0

[0053] Wherein, F1 is the focal length value of the first lens L1, and F represents the focal length value of the entire group of optical lenses.

[0054] The first lens L1 has positive refractive power, can gather light from the object side, can effectively correct the aberration of the entire optical system, realize high pixel and small distortion of the optical lens, and lengthen the overall focal length of the lens...

Embodiment 2

[0067] Figure 1a It is a structural schematic diagram of an optical lens provided in an embodiment of the present invention. The optical lens includes in order from the object side to the image side: a first lens L1, a second lens L2, an aperture element L7, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter Color film IR, glass film CG and imaging surface IMA. Wherein, the first lens L1 is a lens with a positive refractive power and a convex surface facing the object side, the second lens L2 is a meniscus lens with a positive refractive power and a convex surface facing the object side, and the third lens L3 is A biconcave lens, the fourth lens L4 has a positive refractive power, the fifth lens L5 is a biconvex lens with a positive refractive power, the sixth lens L6 is a biconcave lens with a negative refractive power, and the fifth lens L5 and sixth lens L6 form a cemented lens.

[0068] The first lens L1 has a positive refractive power, can ga...

Embodiment 3

[0081] The main difference between the present embodiment and the second embodiment is that the selection of the lens material in the present embodiment is different, and the optical power of the second lens is different.

[0082] Such as Figure 2a As shown, an optical lens, from the object side to the image side, includes: a first lens L1, a second lens L2, an aperture element L7, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6, color filter IR, glass CG and imaging surface IMA. Wherein, the first lens L1 is a lens with a positive refractive power and a convex surface facing the object side, the second lens L2 is a meniscus lens with a negative refractive power and a convex surface facing the object side, and the third lens L3 It is a biconcave lens with negative refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 is a biconvex lens with positive refractive power, and the sixth lens L6 has negative refractive power ...

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Abstract

The invention discloses an optical lens. The optical lens sequentially comprises, from the object side to the image side, a first lens which has positive focal power and of which the convex side faces the object side, a second lens of which the convex side faces the object side, a biconcave third lens, a fourth lens which has positive focal power, a fifth lens, and a sixth lens. The optical lens provided by the invention has the advantages of high resolution, small distortion, large aperture and small size. Moreover, the focal length is relatively large, the field range is reduced, the details of the object can be observed better under the condition of same image plane size, and the demand for small-field observation is satisfied.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to an optical lens. Background technique [0002] With the development of active safety in the automotive industry, the requirements for vehicle front-view cameras continue to increase. On the one hand, the forward-looking camera is used for road monitoring and driving assistance systems. It not only needs to have a high resolution to ensure the clarity of the observed picture, but also needs to meet the requirements of small distortion and reduce the degree of picture distortion and deformation. On the other hand, some requirements, such as driving recorders, etc., mainly focus on the objects in front and the details of road conditions, and have requirements for the observation field of view. At the same time, it is necessary to avoid objects such as in-vehicle devices other than road conditions in the screen due to an excessively large field of view. . The existing Chine...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/18
CPCG02B13/001G02B13/002G02B13/0045G02B13/005
Inventor 姚波张野王东方
Owner NINGBO SUNNY AUTOMOTIVE OPTECH
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