Hybrid diffractive-refractive wide-angle lens

A wide-angle lens and refraction-diffraction hybrid technology, which is applied in the field of optical lenses, can solve the problems of complex structure, many lenses, and large size, and achieve the effects of improving imaging quality, correcting chromatic aberration, and large field of view

Pending Publication Date: 2018-09-28

CHINA JILIANG UNIV

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AI-Extracted Technical Summary

Problems solved by technology

[0003] At present, most of the mobile phone lenses on the market adopt a refractive structure, with many lenses, large si...

Method used

In the present invention, first lens 1, second lens 2 all are the aspheric lens that both sides are even order aspheric surface, lens curved surface adopts aspheric surface, can correct aberration very well, reach higher image quality Require.

In the present invention, the 3rd lens 3 is that the front surface is a spherical surface, and the rear surface is a binary diffract...

Abstract

The invention relates to a hybrid diffractive-refractive wide-angle lens. The hybrid diffractive-refractive wide-angle lens comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens sequentially from an object space to an image space, the first lens is a negative meniscus lens with two even-order aspheric sides, the second lens is a biconcave lens with two even-order aspheric sides, the third lens is provided with a spherical front surface and a binary diffractive rear surface, the fourth lens is a biconvex spherical lens, the fifth lens is a biconcave spherical lens, the sixth lens is a biconvex spherical lens, and the seventh lens is a negative meniscus spherical lens. The hybrid diffractive-refractive wide-angle lens adopting a hybrid manner of diffraction and refraction is small in size and light, total optical length is smaller than 18mm, achieves imaging effects of large visual field, low distortion and low chromatic aberration and obtains high imaging quality.

Application Domain

Diffraction gratings

Technology Topic

PhysicsWide-angle lens +8

Image

$Hybrid diffractive-refractive wide-angle lens$
$Hybrid diffractive-refractive wide-angle lens$
$Hybrid diffractive-refractive wide-angle lens$

Examples

Experimental program(1)

Example Embodiment

[0024] Such as figure 1 As shown, a diffractive hybrid wide-angle lens, from the object side to the image side are the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the diaphragm 5, the fifth lens 6, and the sixth lens in order 7. The seventh lens 8 and the image plane 9. The first lens 1 is a negative meniscus lens with even-order aspheric surfaces on both sides, the second lens 2 is a biconcave lens with even-order aspheric surfaces on both sides, and the front surface of the third lens 3 is a spherical surface , The rear surface is a binary diffractive surface, the fourth lens 4 is a double convex spherical lens, the fifth lens 6 is a double concave spherical lens, the sixth lens 7 is a double convex spherical lens, and the seventh lens 8 is a negative meniscus spherical lens.

[0025] In the present invention, the first lens 1 and the second lens 2 are aspheric lenses with even-order aspheric surfaces on both sides, and the curved surface of the lens adopts aspheric surfaces, which can well correct aberrations and achieve higher image quality requirements.

[0026] In the present invention, the front surface of the third lens 3 is a spherical surface, and the rear surface is a binary diffraction surface. The lens group adopts a refraction-diffraction mixing method. According to the special dispersion characteristics of the binary diffraction surface, the phase The parameter setting can well correct the chromatic aberration caused by the spherical system and greatly reduce the lateral size of the lens.

[0027] In the present invention, F=8.47mm, FOV=64°, FNO=2.37, TTL=17.32mm.

[0028] F is the overall focal length of the lens, FNO is the aperture value, FOV is the full field of view, and TTL is the total length of the optical lens.

[0029] The parameter table of the optical system of the present invention is shown in Table 1

[0030] Table 1

[0031]

[0032]

[0033] The mirrors marked with "*" in Table 1 are aspherical, and their correlation coefficients are shown in Table 2;

[0034] The aspheric surfaces of the first lens 1 and the second lens 2 satisfy the following equations:

[0035] Where: z is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h position along the optical axis direction.

[0036] C=1/r, r represents the radius of curvature of the aspheric apex, k is the conic coefficient, A, B, C, D, and E are high-order aspheric coefficients, and E represents the scientific notation.

[0037] Aspheric coefficients k, A, B, C, D, E:

[0038] Table 2

[0039] Face number

[0040] The mirror surface marked with "#" in Table 1 is a binary diffraction surface, and its correlation coefficient is shown in Table 3;

[0041] The phase parameters of the diffraction surface are determined by the following equation:

[0042] Where: M is the diffraction order, N is the coefficient of the diffraction surface polynomial, Ai is the coefficient of the diffraction surface polynomial, and ρ is the aperture of the diffraction surface.

[0043] The diffraction surface data is as follows:

[0044] table 3

[0045] M

[0046] From Figure 1-5 It can be seen that the optical system has good optical performance and realizes the characteristics of large field of view, low distortion, and low chromatic aberration.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

small size
Correct chromatic aberration

Hybrid diffractive-refractive wide-angle lens

A wide-angle lens and refraction-diffraction hybrid technology, which is applied in the field of optical lenses, can solve the problems of complex structure, many lenses, and large size, and achieve the effects of improving imaging quality, correcting chromatic aberration, and large field of view

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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