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Small-distortion monitoring optical lens

An optical lens and optical system technology, applied in optics, optical components, instruments, etc., to achieve the effect of stable environmental adaptability, simple structure, and satisfying imaging quality requirements

Pending Publication Date: 2020-09-11
SIRTEC INT SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, among the only small field of view monitoring lenses, although there is a low-cost glass-plastic hybrid structure, for the driver status monitoring lens with strict environmental performance requirements, the all-glass structure with small distortion and good environmental stability is currently still The Trend of Priority Selection of Vehicle Surveillance Lens
However, the existing optical lenses cannot meet the above requirements for the time being.

Method used

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Examples

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specific Embodiment

[0047] Specific examples, see figure 1 , the optical parameters of each component are shown in Table 1:

[0048]

[0049]

[0050] Table 1

[0051] In Table 1, when the radius of curvature of the surface of the diaphragm S, the IR filter L5 and the cover glass L6 is Infinity, it means that the surface is a plane.

[0052] The stop S is placed on the object side of the first lens L1, the object side of the first lens L1 is convex, and the image side is concave; the object side of the second lens L2 is concave, and the image side is concave; the object side of the third lens L3 is concave, and the image side is convex; the object side of the fourth lens L4 is convex, and the image side is concave.

[0053] In a specific embodiment, the aspherical coefficient values ​​of each surface are as shown in Table 2:

[0054]

[0055] Table 2

[0056] In the specific embodiment, the numerical value of each parameter is as shown in table 3:

[0057] parameter TTL(...

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Abstract

The invention provides a small-distortion monitoring optical lens which has high detail resolution capability in a small field of view, is short, small and light in weight, has small distortion and stable environmental adaptability, can realize effective control of ghosting, and meets the imaging quality requirement of a monitoring lens. The small-distortion monitoring optical lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side surface to an image side surface along an optical axis, and is characterized in that the first lens has positivefocal power, and the object side surface of the first lens is a convex surface; the second lens has negative focal power, and the object side surface of the second lens is a concave surface; the third lens has positive focal power, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface; and a color filter, protective glassand IMA are sequentially arranged behind the image side surface of the fourth lens.

Description

technical field [0001] The invention relates to the technical field of lens structures, in particular to a small distortion monitoring optical lens. Background technique [0002] With the continuous development of intelligent and safe driving of automobiles, the requirements for on-board surveillance imaging lenses continue to increase. On the premise of maintaining a small field of view and high detail resolution capability of the lens, and the lens is short and lightweight, the requirements for the environmental stability of the lens and the restoration of monitoring facts, stray light, ghosting and other factors are getting higher and higher. At present, among the only small field of view monitoring lenses, although there is a low-cost glass-plastic hybrid structure, for the driver status monitoring lens with strict environmental performance requirements, the all-glass structure with small distortion and good environmental stability is currently still The trend of priori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18G02B1/00
CPCG02B1/00G02B13/004G02B13/18
Inventor 史晓梅吴喆明孙振中罗艳波杨井留
Owner SIRTEC INT SUZHOU
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