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Optical System Lens

An optical system and lens technology, applied in optics, optical components, instruments, etc., can solve the problems of insufficient lens focal length, unreasonable distribution of telephoto power, low refractive index of materials, etc. The effect of light path design

Active Publication Date: 2019-11-19
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the defect of ultra-low dispersion glass is that the refractive index of the material is generally not high. A large amount of ultra-low dispersion glass causes the lens to bear insufficient focal length, and the optical power at the telephoto end cannot be reasonably shared. Therefore, most lenses cannot achieve infrared commonality at the telephoto end. focal function

Method used

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Examples

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Embodiment 1

[0051] Such as figure 1 As shown, this embodiment includes the first fixed lens group G1 with positive refractive power, the first zoom lens group G2 with negative refractive power, the aperture stop STP, and the second fixed lens group with positive refractive power from the object side to the image side. Two zoom lens groups G3, a focusing lens group G4 with negative power, a second fixed lens group G5 with positive power, and an optical filter ICF from the object side to the image side along the optical axis through the first zoom lens group At the same time, the second zoom lens group moves along the optical axis, and the position of the lens group on the optical axis corresponds to the position of the first zoom lens group, so as to realize the zoom from the wide-angle end to the telephoto end; through the focusing lens group Move along the optical axis to perform correction and focus adjustment of the image plane variation accompanying the magnification change.

[0052]...

Embodiment 2

[0076] Such as Figure 4 As shown, the zoom lens in this embodiment is compared with Embodiment 1. In this embodiment, the second lens L2 with negative refractive power is cemented with the first lens L1 with positive refractive power, and the refractive index of the lens material and Abbe The collocation of the number ensures the peripheral chromatic aberration transition of the optical system as much as possible.

[0077] Various numerical data about the zoom lens of Example 2 are shown below.

[0078] EFL=6.40 (wide-angle end)~265.0 (telephoto end)

[0079] F number = 1.51 (wide-angle end) ~ 4.58 (telephoto end)

[0080] Table 4 shows the structural parameters of the lens of Example 2; Table 5 shows the zoom parameters of the lens of Example 2; Table 6 shows the aspheric coefficient of the lens of Example 2.

[0081] Figure 5 It is the various aberration diagrams of the wide-angle end of the lens of embodiment 2 with respect to the d line; Figure 6 It is each aberrat...

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Abstract

An optical system lens sequentially comprises a first fixed lens group, a first zoom lens group, an aperture diaphragm, a second zoom lens group, a focus lens group, a second fixed lens group and an optical filter from an object side to an image side, wherein the first fixed lens group has positive power, the first zoom lens group has negative power, the second fixed lens group has positive power,the focus lens group has negative power, and the second fixed lens group has positive power. The optical system lens has the advantages of ultrahigh rate, full-rate infrared confocal property, smallsize, large aperture and the like. Moreover, aberration can be effectively corrected by crossing a whole zoom domain, and the optical system lens can correspond to a solid-state imaging element capable of performing ultra-high-definition 4K image photography.

Description

technical field [0001] The invention relates to a technology in the field of optical devices, in particular to an optical system lens with a large zoom ratio of 4K resolution performance. Background technique [0002] In order to ensure that the focal length at the telephoto end is long enough, the high-magnification zoom lens has to reserve sufficient space for the zoom group to move, sacrificing the overall length of the lens. A large zoom stroke will result in a longer lens mechanism frame, which will cause great trouble to the coaxiality of the processing; at the same time, the drive motor screw of the zoom group must be extended accordingly, which will lead to poor motor stability and slow zoom speed. However, an excessively large magnification-travel ratio makes the magnification of the lens sensitive, and the accumulated air gap error will affect the length of the zoom stroke, thereby affecting the magnification consistency of the lens. As the focal length increases,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/14
CPCG02B15/14
Inventor 厉冰川李长峰尚洁阳盛亚茗张平华
Owner JIAXING ZHONGRUN OPTICAL TECH
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