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Large-aperture 4K prime lens

A fixed-focus lens and aperture technology, applied in the lens field, can solve the problems of increased lens production cost, unfavorable marketing, multi-lens, etc., and achieve the effect of excellent imaging quality, reduced number of lenses, and reasonable price

Pending Publication Date: 2017-11-21
DONGGUAN YUTONG OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is necessary to design a 4K ultra-high-definition wide-angle fixed-focus lens with a large aperture, more lenses will be required, which will undoubtedly greatly increase the production cost of the lens, which is not conducive to market promotion

Method used

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  • Large-aperture 4K prime lens
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  • Large-aperture 4K prime lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Please refer to figure 1 , the first lens 1 is a concave-convex negative power lens, the second lens 2 is a concave-convex negative power lens, the third lens 3 is a convex-plane positive power lens, and the fourth lens 4 is A biconvex positive power lens, the fifth lens 5 is a biconcave negative power lens, the sixth lens 6 is a biconvex positive power lens, the seventh lens 7 is a biconcave negative power lens, and the eighth lens 8 is a biconvex positive power lens.

[0033] The parameters of the first lens to the eighth lens are shown in the table below:

[0034] f1＝-13.5～-4.5

[0035] Among them, f1 to f8 respectively represent the lens focal lengths of the first lens to the eighth lens in sequence; n1 to n8 represent the refractive indices of the first lens to the eighth lens in sequence; R1, R3, R5, R7, R9, R11, R13, and R15 respectively represent the curvature radii of the surface centers of the first lens to the eighth lens facing the obje...

Embodiment 2

[0045] Example 2: Please refer to figure 2 , compared with Embodiment 1, the number and type of lenses are basically the same, but the specific lens parameters and layout are different.

[0046]The first lens 1 is a concave-convex negative power lens, the second lens 2 is a concave-convex negative power lens, the third lens 3 is a double-convex positive power lens, and the fourth lens 4 is a double-convex lens. A convex positive power lens, the fifth lens 5 is a biconcave negative power lens, the sixth lens 6 is a biconvex positive power lens, and the seventh lens 7 is a biconcave negative power lens, The eighth lens 8 is a biconvex positive power lens.

[0047] The refractive index, focal length and curvature radius parameters of the first lens to the eighth lens are shown in the following table:

[0048] f1＝-11.5～-4.5

n1＝1.43～1.85

R1＝15～200

R2＝3.1～8.9

f2＝-21.5～-10.1

n2＝1.47～1.68

R3＝-8.9～-3.1

R4＝-40～-4.5

f3＝6.5～13.5

n3＝1.7～2.1

R...

Embodiment 3

[0054] Example Three: Please refer to image 3 , compared with Embodiment 1, the number and type of lenses are basically the same, but the specific lens parameters and layout are different.

[0055] The first lens 1 is a concave-convex negative power lens, the second lens 2 is a concave-convex negative power lens, the third lens 3 is a double-convex positive power lens, and the fourth lens 4 is a double-convex lens. A convex positive power lens, the fifth lens 5 is a biconcave negative power lens, the sixth lens 6 is a biconvex positive power lens, and the seventh lens 7 is a biconcave negative power lens, The eighth lens 8 is a convex-concave positive power lens.

[0056] The parameters of the first lens to the eighth lens are shown in the table below:

[0057] f1＝-11.5～-4.5

[0058] The aspheric coefficients satisfying the above-mentioned aspheric equations in Embodiment 3 are shown in the following table:

[0059]

[0060]

[0061] In this embodiment, the ...

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Abstract

The invention provides a large-aperture 4K prime lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged along an optical axis from an object space to an image space, wherein the first lens, the third lens, the fourth lens, the fifth lens and the eighth lens are glass lenses, and the second lens, the sixth lens and the seventh lens are plastic aspherical lenses. By the aid of an 8-piece optical structure with the five glass spherical lenses and the three plastic aspherical lenses, visible light and infrared light can simultaneously reach indexes such as 4K resolution ratio, F1.4 maximum aperture, 1 / 1.8' image surface maximum 160-degree field angles and optical overall length smaller than 30mm.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to a 4K fixed-focus lens with a large aperture. Background technique [0002] In security monitoring, due to the different sizes of objects, different distances, and different lens magnifications, it is often necessary to enlarge the screen for better recognition. However, the pixels of traditional full HD cameras are only 2 million pixels. If the monitoring screen needs to be enlarged, the details will be blurred due to the low pixels. Therefore, in recent years, the concept of 4K ultra-high definition has gradually emerged in the security field. With ultra-high pixels, 4K security cameras can maintain a relatively high resolution even if the screen is enlarged, which is conducive to better identification of targets. At the same time, security monitoring needs to be carried out continuously throughout the day. Not only can it present a good picture during the day, but it also needs ...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/06G02B13/18G02B1/00G02B1/04
CPCG02B13/0045G02B13/06G02B13/18G02B1/00G02B1/04
Inventor 何剑炜刘官禄
Owner DONGGUAN YUTONG OPTICAL TECH
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