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A lens

A lens and lens technology, applied in the field of optical lenses, can solve the problems of increasing lens complexity and cost, small field of view, etc., and achieve the effect of compact structure, high definition, and wide spectrum coverage

Active Publication Date: 2019-09-24
HANGZHOU HIKMICRO SENSING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patent document CN106772939 discloses a larger aperture, but the lens adopts a plastic aspheric surface, which increases the complexity and cost of the lens
A similarly applied lens is disclosed in patent document CN106597638A, but it is a telephoto lens with a small field of view

Method used

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no. 1 example

[0067] The first embodiment of the present invention is as figure 1 As shown, from the object side to the image side, 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 are arranged in sequence. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all spherical lenses.

[0068] The first lens L1 has positive refractive power; the second lens L2 has negative refractive power. The first lens L1 is crown glass, and the second lens L2 is flint glass. This combination can reduce local chromatic aberration, and at the same time, the higher refractive index is beneficial to reduce advanced aberrations.

[0069] The third lens has positive power, the fourth lens has negative power, and the fifth lens has positive power. Advantageously, the third, fourth, and fifth lenses constitute a classic Cooke lens structure, which is benefic...

no. 2 example

[0086] The second embodiment of the present invention is as Figure 4 as shown, Figure 4 The shown lens includes in sequence from the object side to the image side: a first lens L1 with negative power, a second lens L2 with positive power, a third lens L3 with positive power, and a lens with negative power. The fourth lens L4, the fifth lens L5 having positive power, the sixth lens L6 having positive power, the seventh lens L7 and the eighth lens L8 having negative power.

[0087] The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all spherical lenses.

[0088] The first lens L1 is a negative lens and is a biconcave lens, the fourth lens L4 is a biconcave lens, and the surface of the eighth lens L8 facing the image plane is concave.

[0089] In this embodiment, the lens stop is located between the fourth lens and the fifth lens. The lens aperture corresponds to Figure 4 Surface S9(STO...

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Abstract

The invention discloses a lens. The lens includes a first lens and a second lens which are arranged in order from an object side to an image side, wherein one of the first and second lenses is a positive lens and the other is a negative lens, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens and a sixth lens with positive focal power, a seventh lens with positive focal power and an eighth lens with negative focal power. The first, second, third, fourth, fifth, sixth, seventh and eighth lenses are spherical lenses. According to the invention, the eight spherical lenses are combined to form the lens with a large aperture by appropriately selecting and arranging a lens structure, thereby providing the lens with the large aperture in a low-cost way.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to a lens with a large aperture, especially a night vision lens suitable for low illumination. Background technique [0002] With the improvement of living standards and the development of imaging technology, the requirements for safety are getting higher and higher. Due to the ability of low-light imaging devices to observe objects in extremely dark conditions, they have received continuous attention in the fields of security and defense. [0003] In order to better reflect the low illumination effect of the detector, it is necessary to design a large aperture lens. Conventional lenses in the prior art generally only have apertures below F1.4, and lenses with F1.0 that can meet the focus of visible light and near-infrared light are rarely involved. [0004] The patent document CN106772939 discloses a larger aperture, but the lens adopts a plastic aspheric surface, which in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/14G02B1/00
CPCG02B1/00G02B13/00G02B13/14
Inventor 张振洲李良辉蒋贤满葛路烨
Owner HANGZHOU HIKMICRO SENSING TECH CO LTD
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