Optical system with optimized low-light effects

An optical system and optical axis technology, applied in the field of optical systems, can solve the problems of inability to achieve the same level of resolution, large performance loss, cost pressure, etc., and achieve the effects of rich color detail information, high picture illumination, and high resolution level.

Active Publication Date: 2020-04-14
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the external environment is complex, it is difficult to ensure that there is sufficient infrared light in the environment. It is usually necessary to equip the lens with an additional infrared light source generator and photosensitive components, which brings pressure on cost.
In infrared mode, compared with visible light imaging, there will be a greater performance loss, and the same level of resolution cannot be achieved.

Method used

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  • Optical system with optimized low-light effects
  • Optical system with optimized low-light effects
  • Optical system with optimized low-light effects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, this embodiment includes the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the aperture stop S of the system, and the second lens group with positive refractive power from the object side to the image side. Three lens groups G3, fourth lens group G4 with negative refractive power, fifth lens group G5 with positive refractive power, dual-spectrum photosensitive mechanism including dichroic prism P, infrared sensor IR-IMG and visible light sensor VIS-IMG.

[0027] The ratio of the focal length of the telephoto end of the lens of the first lens group G1 to the focal length of the lens group is (1.40, 4.25), and the focal length of the first lens on the near object side in the first lens group G1 is equal to the focal length of the lens telephoto end The ratio of the focal length is (-0.48,-0.23).

[0028] The ratio of the focal length of the first lens on the near-object side in the ...

Embodiment 2

[0062] The difference with Embodiment 1 is that in this embodiment:

[0063] The second lens group G2 includes in order from the object side: the sixth lens L6 with negative refractive power, the seventh lens L7 with negative refractive power and both sides are aspherical, and the eighth lens with positive refractive power L8 and the ninth lens L9 with negative power and aspheric surfaces on both sides.

[0064] The third lens group G3 includes in order from the object side: the tenth lens L10 with positive refractive power and both surfaces are aspherical, the eleventh lens L11 with negative refractive power, and the twelfth lens L11 with positive refractive power. Lens L12, the thirteenth lens L13 with negative refractive power and the fourteenth lens L14 with positive refractive power, wherein the eleventh lens L11 and the twelfth lens L12, the thirteenth lens L13 and the fourteenth lens L14 glued together.

[0065] Various numerical data about the zoom lens of Example 2 ...

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Abstract

An optical system with an optimized low-luminance effect comprises from an object side to an image side in order: a first lens set with positive focal power, a second lens set with negative focal power, an aperture diaphragm, a third lens set with positive focal power, a fourth lens set with negative focal power, a fifth lens set with positive focal power and a dual-spectrum photosensitive mechanism. The first lens set and the fifth lens set are fixedly arranged, the second lens set used for zooming, the aperture diaphragm, the third lens set and the fourth lens set used for focusing are movably arranged, the system has features such as respective and independent imaging of visual / infrared double light, image synthesis, sensor zooming, an ultrahigh rate, a small size and a large aperture,can correct aberrations by crossing the whole zooming region, and can correspond to a solid camera shooting element capable of performing ultra high-definition 4K image camera.

Description

technical field [0001] The invention relates to a technology in the field of optical devices, in particular to an optical system with excellent low-light effect, super large zoom ratio and 4K image quality. Background technique [0002] At this stage, the demand for low-light shooting in the market is increasingly strong, and the excellent low-light effect must require the lens to have the largest possible aperture number. In order to improve the low-light shooting effect of the lens, there are usually two solutions: one is to increase The large aperture of the lens ensures that when shooting in a dark environment, the lens can capture more imaging light, thereby improving the illumination of the picture. However, the size of the aperture depends on the effective aperture of the lens inside the lens. A larger aperture will inevitably cause the lens to become a "monster", which will cause inconvenience to lens processing and lens assembly. The second is to use infrared light...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/173
CPCG02B15/173
Inventor 厉冰川陈三忠盛亚茗张平华
Owner JIAXING ZHONGRUN OPTICAL TECH
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