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fixed focus lens

A fixed-focus lens and lens technology, which is applied in the field of optical systems, can solve problems such as large dispersion, serious purple fringing, and blurred lens imaging, and achieve clear and bright images, reduce processing difficulty and cost, and have a wide range of applications

Active Publication Date: 2020-03-31
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of lens has excellent imaging in the ultraviolet light field, it often causes problems such as blurred lens imaging, serious purple fringing, and large dispersion when used in conjunction with visible light.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] like figure 1 As shown, in this embodiment, the first lens group G1 with positive refractive power, the diaphragm STP, and the second lens group G2 with positive refractive power are arranged sequentially from the object plane side to the image plane side along the light incident direction, wherein : The first lens group G1 includes a first lens L1 with negative power, a second lens L2 with positive power, a third lens L3 with negative power, and a fourth lens L4 with positive power; The second lens group G2 includes a fifth lens L5 with negative power, a sixth lens L6 with positive power, a seventh lens L7 with positive power, and an eighth lens L8 with positive power.

[0029] Specifically, the overall focal length of the lens described in this embodiment is F=30 mm, the aperture number Fno=2, and the field of view Fov=26°.

[0030] The lens structure parameters of this embodiment are specifically as follows:

[0031] surface serial number surface type ...

Embodiment 2

[0040] like Figure 5 Shown is a schematic diagram of the structure of this embodiment. Compared with Example 1, this example adds a balance lens LX with negative refractive power behind the diaphragm STP. This lens can further balance the focal length allocation ratio of the two lens groups and reduce the spherical image of the lens in the example. Poor, so that the image quality can be further improved.

[0041] Specifically, the overall focal length of the lens described in this embodiment is F=27mm, the aperture number Fno=2.4, and the horizontal field of view Fov=22°.

[0042] The lens structure parameters of this embodiment are specifically as follows:

[0043]

[0044]

[0045] In this embodiment, the overall focal length ratios of the first lens group G1 , the second lens group G2 , and the fixed-focus lens are 1.09 and 1.02 respectively: at this time, the focal length ratios of the front and rear of the lens can balance the optical distortion caused by imaging...

Embodiment 3

[0053] like Figure 9 Shown is a schematic diagram of the structure of this embodiment. In this embodiment, on the basis of Embodiment 2, a first balanced lens LX1 with positive refractive power and a second balanced lens LX2 with positive refractive power are added in front and rear of the diaphragm STP respectively.

[0054] The first balanced lens LX1 adopts a glass material with a higher Abbe number, which further reduces the lateral chromatic aberration and spherical aberration of the lens compared with the previous two embodiments.

[0055] The balanced lens LX and the second balanced lens LX2 adopt the combination of negative and positive lenses, which not only balances the focal length ratio between the first lens group G1 and the second lens group G2, but also reduces the coma aberration and image curvature of the system, The imaging quality of the lens of this embodiment is further improved.

[0056] Specifically, the overall focal length of the lens described in t...

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Abstract

The invention relates to a prime lens. The prime lens comprises a first lens group with positive focal power, a diaphragm and a second lens group with positive focal power sequentially from an objectsurface side to an image surface side, wherein the fist lens group comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power anda fourth lens with positive focal power; and the second lens group comprises a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power and an eighth lens with positive focal power. The prime lens has imaging capability up to 8M pixel, can be applied to near ultraviolet imaging, can be applied to imaging in the visible light waveband range, does not have obvious purple boundary and chromatic dispersion and has clear and bright image quality. The integral relative illumination of the camera lens reaches more than 90 percent, the imaging uniformity is achieved, dark corners do not exist at the periphery, and the optical distortion of the camera lens is controlled to be within 1 percent.

Description

technical field [0001] The invention relates to a technology in the field of optical systems, in particular to a fixed-focus imaging lens for visible light and near-ultraviolet fields. Background technique [0002] In the fields of near-ultraviolet and visible light, few lenses can be compatible with both wavelengths. Existing lenses on the market can generally only be used in the near-ultraviolet field. This type of lens is generally used in high-end fields such as lithography machines and three-dimensional printers. The special application in this field requires high imaging quality of the lens, so the lens is generally used in a single field. At the same time, this type of lens also needs to meet high relative illumination in order to ensure the overall uniformity of the image surface brightness. In addition, optical distortion is also an important consideration. Although this type of lens has excellent imaging in the ultraviolet light field, it often causes problems s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/14
CPCG02B13/0015G02B13/143
Inventor 尚洁阳诸益炜盛亚茗
Owner JIAXING ZHONGRUN OPTICAL TECH
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