CN115586619A - Wide-angle lens - Google Patents

Wide-angle lens Download PDF

Info

Publication number
CN115586619A
CN115586619A CN202110759874.5A CN202110759874A CN115586619A CN 115586619 A CN115586619 A CN 115586619A CN 202110759874 A CN202110759874 A CN 202110759874A CN 115586619 A CN115586619 A CN 115586619A
Authority
CN
China
Prior art keywords
lens
wide
lens element
image
curvature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110759874.5A
Other languages
Chinese (zh)
Inventor
王立楷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
Original Assignee
Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sintai Optical Shenzhen Co Ltd, Asia Optical Co Inc filed Critical Sintai Optical Shenzhen Co Ltd
Priority to CN202110759874.5A priority Critical patent/CN115586619A/en
Priority to US17/834,991 priority patent/US20230020801A1/en
Publication of CN115586619A publication Critical patent/CN115586619A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Abstract

A wide-angle lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power and is a meniscus lens. The second lens has positive refractive power and is a meniscus lens. The third lens has a refractive power. The fourth lens element with negative refractive power is a biconcave lens element and has a concave surface facing the object side and another concave surface facing the image side. The fifth lens element has a positive refractive power and includes a convex surface facing the object side. The sixth lens element has refractive power and includes a concave surface facing the object side. The first, second, third, fourth, fifth and sixth lenses are arranged along an optical axis in order from an object side to an image side.

Description

Wide-angle lens
Technical Field
The invention relates to a wide-angle lens.
Background
The current wide-angle lens cannot meet the current requirements, and needs another wide-angle lens with a new framework to meet the requirements of large field of view and high resolution at the same time.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a wide-angle lens, which has a large field of view and a high resolution, but still has good optical performance, aiming at the defect that the wide-angle lens in the prior art cannot meet the requirements of large field of view and high resolution at the same time.
The present invention adopts a technical solution to solve the technical problem of providing a wide-angle lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has negative refractive power and is a meniscus lens. The second lens has positive refractive power and is a meniscus lens. The third lens has a refractive power. The fourth lens element with negative refractive power is a biconcave lens element and has a concave surface facing the object side and another concave surface facing the image side. The fifth lens element has a positive refractive power and includes a convex surface facing the object side. The sixth lens element has refractive power and includes a concave surface facing the object side. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially disposed from an object side to an image side along an optical axis.
Wherein the third lens has a positive refractive power and the sixth lens has a positive refractive power.
The first lens element includes a convex surface facing the object side and another concave surface facing the image side.
The second lens element includes a concave surface facing the object side and a convex surface facing the image side.
The third lens element is a biconvex lens element and has a convex surface facing the object side and another convex surface facing the image side.
The fifth lens element is a biconvex lens element and may further include another convex surface facing the image side.
The sixth lens element is a meniscus lens element and may further include a convex surface facing the image side.
The wide-angle lens of the invention may further comprise an aperture stop disposed between the second lens element and the third lens element.
Wherein the wide-angle lens at least satisfies one of the following conditions: 0.6<∣R 11 /R 41 ∣<2.4；4<R 21 /(R 12 +R 22 )<13.5；9.9<R 42 /CT4<103；1.3<R 51 /(f2-CT5)<3.5；4<f2/(CT2-CT6)<8.2; wherein R is 11 Is the radius of curvature, R, of the object-side surface of the first lens 12 Is the radius of curvature, R, of the image-side surface of the first lens 21 Is the radius of curvature, R, of the object-side surface of the second lens 22 Is the radius of curvature, R, of the image-side surface of the second lens 41 Is the radius of curvature, R, of the object-side surface of the fourth lens 42 Is the radius of curvature, R, of the image-side surface of the fourth lens 51 The curvature radius of the object-side surface of the fifth lens element, CT2 is an axial distance from the object-side surface to the image-side surface of the second lens element, CT4 is an axial distance from the object-side surface to the image-side surface of the fourth lens element, CT5 is an axial distance from the object-side surface to the image-side surface of the fifth lens element, CT6 is an axial distance from the object-side surface to the image-side surface of the sixth lens element, and f2 is an effective focal length of the second lens element.
The wide-angle lens meets the following conditions: -13<(R 42 +R 41 )/R 32 <0.3；5mm<∣R 61 /Nd1∣<15mm；11mm<∣R 41 -f2∣<25mm；-3.2<f1/(R 41 +f5)<2.3；3.3mm<R 42 /(Vd3/Vd4)<30mm; wherein R is 32 Is the radius of curvature, R, of the image-side surface of the third lens 41 Is the radius of curvature, R, of the object-side surface of the fourth lens 42 Is the radius of curvature R of the image side surface of the fourth lens 61 The curvature radius of the object-side surface of the sixth lens element, nd1, f2, f5, vd3, and Vd4 are the refractive index of the first lens element, the effective focal length of the second lens element, the effective focal length of the fifth lens element, the abbe number of the third lens element, and the abbe number of the fourth lens element, respectively.
The wide-angle lens has the following beneficial effects: the field of view is large, the resolution is high, and the optical performance is good.
Drawings
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic diagram of lens configuration and optical path of a wide-angle lens according to a first embodiment of the present invention.
Fig. 2A, 2B, 2C, and 2D are a Longitudinal Aberration (Longitudinal Aberration) diagram, a Field Curvature (Field Curvature) diagram, a Distortion (Distortion) diagram, and a Relative Illumination (Relative Illumination) diagram of the wide-angle lens according to the first embodiment of the present invention, respectively.
Fig. 3 is a schematic diagram of a lens configuration and an optical path of a wide-angle lens according to a second embodiment of the present invention.
Fig. 4A, 4B, 4C and 4D are a longitudinal aberration diagram, a field curvature diagram, a distortion diagram and a relative illumination diagram of a wide-angle lens according to a second embodiment of the present invention.
Fig. 5 is a lens configuration and optical path diagram of a wide-angle lens according to a third embodiment of the present invention.
Fig. 6A, 6B, 6C and 6D are a longitudinal aberration diagram, a field curvature diagram, a distortion diagram and a relative illumination diagram of the wide-angle lens according to the third embodiment of the present invention.
Detailed Description
The present invention provides a wide-angle lens, including: the first lens has negative refractive power, is a meniscus lens and comprises a convex surface facing to the object side and a concave surface facing to the image side; the second lens has positive refractive power, is a meniscus lens and comprises a concave surface facing to the object side and a convex surface facing to the image side; the third lens has refractive power; the fourth lens element with negative refractive power comprises a biconcave lens element with a concave surface facing the object side and another concave surface facing the image side; the fifth lens has positive refractive power and comprises a convex surface facing the object side; the sixth lens has refractive power and comprises a concave surface facing the object side; the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially disposed from an object side to an image side along an optical axis.
Please refer to the following tables, table one, table two, table four, table five, table seven and table eight, where table one, table four and table seven are the related parameter tables of each lens in the first to third embodiments of the wide-angle lens according to the present invention, and table two, table five and table eight are the related parameter tables of each lens in the first to third embodiments of the wide-angle lens according to the present inventionIn the following embodiments, the aspherical surface sag z of the aspherical lens is obtained by the following formula: z = ch 2 /{1+[1-(k+1)c 2 h 2 ] 1/2 }+Ah 4 +Bh 6 +Ch 8 +Dh 10 Wherein: c is curvature, h is the perpendicular distance from any point of the lens surface to the optical axis, k is Conic coefficient (Conic Constant), A-D are aspheric coefficients, and E in the coefficients represents scientific notation, e.g. E-03 represents 10 -3 。
Fig. 1, 3 and 5 are schematic diagrams illustrating lens configurations and optical paths of first, second and third embodiments of a wide-angle lens according to the present invention, wherein the first lenses L11, L21 and L31 are meniscus lenses with negative refractive power, and are made of plastic materials, the object-side surfaces S11, S21 and S31 are convex surfaces, the image-side surfaces S12, S22 and S32 are concave surfaces, and the object-side surfaces S11, S21 and S31 and the image-side surfaces S12, S22 and S32 are aspheric surfaces. The second lenses L12, L22, L32 are meniscus lenses with positive refractive power, and are made of plastic materials, wherein the object side surfaces S13, S23, S33 are concave surfaces, the image side surfaces S14, S24, S34 are convex surfaces, and the object side surfaces S13, S23, S33 and the image side surfaces S14, S24, S34 are aspheric surfaces. The third lenses L13, L23, and L33 are biconvex lenses with positive refractive power, made of plastic material, and have convex object-side surfaces S16, S26, and S36, convex image-side surfaces S17, S27, and S37, and aspheric object-side surfaces S16, S26, and S36 and image-side surfaces S17, S27, and S37. The fourth lenses L14, L24, and L34 are biconcave lenses having negative refractive power, and made of plastic material, and have concave object-side surfaces S18, S28, and S38, concave image-side surfaces S19, S29, and S39, and aspheric surfaces on the object-side surfaces S18, S28, and S38 and the image-side surfaces S19, S29, and S39. The fifth lenses L15, L25, and L35 are biconvex lenses made of plastic material, and have object-side surfaces S110, S210, and S310 being convex surfaces, image-side surfaces S111, S211, and S311 being convex surfaces, and the object-side surfaces S110, S210, and S310 and the image-side surfaces S111, S211, and S311 being aspheric surfaces. The sixth lenses L16, L26, and L36 are meniscus lenses with positive refractive power, made of plastic material, and have concave object-side surfaces S112, S212, and S312, convex image-side surfaces S113, S213, and S313, and aspheric object-side surfaces S112, S212, and S312 and image-side surfaces S113, S213, and S313.
In the wide-angle lens of the present invention, an air space may be provided between two adjacent lenses of the first lens element to the sixth lens element on the optical axis, that is, the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element may be six single non-cemented lens elements. Since the manufacturing process of the cemented lens is more complicated than that of the non-cemented lens, especially the cemented surfaces of the two lenses need to have a curved surface with high accuracy, so as to achieve high degree of conformity when the two lenses are cemented, and in the process of cementing, poor degree of conformity due to misalignment may also cause an impact on the overall optical imaging quality. Therefore, in the wide-angle lens of the invention, an air space can be formed between any two adjacent lenses on the optical axis, so that the assembly simplicity of the wide-angle lens can be ensured, and the assembly yield can be increased.
In addition, the wide- angle lenses 1, 2, 3 satisfy at least one of the following conditions:
0.6<∣R 11 /R 41 ∣<2.4； (1)
4<R 21 /(R 12 +R 22 )<13.5； (2)
9.9<R 42 /CT4<103； (3)
1.3<R 51 /(f2-CT5)<3.5； (4)
4<f2/(CT2-CT6)<8.2； (5)
5mm<∣R 61 /Nd1∣<15mm； (6)
11mm<∣R 41 -f2∣<25mm； (7)
-3.2<f1/(R 41 +f5)<2.3； (8)
-13<(R 42 +R 41 )/R 32 <0.3； (9)
3.3mm<R 42 /(Vd3/Vd4)<30mm； (10)
wherein R is 11 In the first to third embodiments, the radius of curvature, R, of the object-side surfaces S11, S21, S31 of the first lenses L11, L21, L31 12 In the first to third embodiments, the radius of curvature, R, of the image-side surfaces S12, S22, S32 of the first lenses L11, L21, L31 21 The object side surfaces S13, S23, S33 of the second lenses L12, L22, L32 have a radius of curvature R in the first to third embodiments 22 The radius of curvature, R, of the image-side surfaces S14, S24, S34 of the second lenses L12, L22, L32 in the first to third embodiments 32 The radius of curvature, R, of the image-side surfaces S17, S27, S37 of the third lenses L13, L23, L33 in the first to third embodiments 41 The object side surfaces S18, S28, S38 of the fourth lenses L14, L24, L34 have the radius of curvature, R 42 The image side surfaces S19, S29, S39 of the fourth lenses L14, L24, L34 have a radius of curvature R in the first to third embodiments 51 The object side surfaces S110, S210, S310 of the fifth lenses L15, L25, L35 have a radius of curvature R in the first to third embodiments 61 In the first to third embodiments, the radius of curvature of the object-side surfaces S112, S212, S312 of the sixth lenses L16, L26, L36, CT2 is the distance between the object-side surfaces S13, S23, S33 of the second lenses L12, L22, L32 and the image-side surfaces S14, S24, S34 on the optical axes OA1, OA2, OA3, CT4 is the distance between the object-side surfaces S18, S28, S38 of the fourth lenses L14, L24, L34 and the image-side surfaces S19, S29, S39 on the optical axes OA1, OA2, OA3, CT5 is the distance between the object-side surfaces S110, S210, S310 and the image-side surfaces S111, S211, S311 of the fifth lenses L15, L25, L35 on the optical axes OA1, OA2, OA3, CT6 is the distance between the object-side surfaces S112, S212, S312 and the image-side surfaces S113, S213, S313 of the sixth lenses L16, L26, L36 on the optical axes OA1, OA2, OA3 in the first to third embodiments, f1 is the effective focal length of the first lenses L11, L21, L31, f2 is the effective focal length of the second lenses L12, L22, L32 in the first to third embodiments, f5 is the effective focal length of the fifth lenses L15, L25, L35 in the first to third embodiments, nd1 is the refractive index of the first lenses L11, L21, L31 in the first to third embodiments, vd3 is the abbe coefficient of the third lenses L13, L23, L33 in the first to third embodiments, and Vd4 is the abbe coefficient of the first to third embodimentsIn the example, abbe numbers of the fourth lenses L14, L24, and L34 are shown. Therefore, the wide- angle lenses 1, 2 and 3 can effectively improve the field of view, effectively improve the resolution and effectively correct the aberration.
When condition (1) is satisfied: 0.6<∣R 11 /R 41 ∣<2.4, a wide angle lens may be provided with sufficient power to control the field of view and help correct aberrations. When condition (2) is satisfied: 4<R 21 /(R 12 +R 22 )<13.5, a wide angle lens may be provided with sufficient power to control the field of view and help correct aberrations. When condition (3) is satisfied: 9.9<R 42 /CT4<103, the fourth lens element may have a proper thickness and focal length to correct the off-axis aberration. When condition (4) is satisfied: 1.3<R 51 /(f2-CT5)<3.5, the fifth lens element can have a proper thickness and focal length to correct the off-axis aberration. When condition (5) is satisfied: 4<f2/(CT2-CT6)<At 8.2, the second and fifth lenses can have appropriate thickness and focal length to correct off-axis aberration. When condition (6) is satisfied: 5mm<∣R 61 /Nd1∣<When the thickness is 15mm, aberration can be corrected and resolution can be improved. When condition (7) is satisfied: 11mm<∣R 41 -f2∣<When the thickness is 25mm, aberration can be corrected and resolution can be improved. When condition (8) is satisfied: -3.2<f1/(R 41 +f5)<2.3, aberration can be corrected and resolution can be improved. When condition (9) is satisfied: -13<(R 42 +R 41 )/R 32 <When the optical axis is 0.3, aberration can be corrected and resolution can be improved. When condition (10) is satisfied: 3.3mm<R 42 /(Vd3/Vd4)<When the thickness is 30mm, aberration can be corrected and resolution can be improved.
A first embodiment of the wide-angle lens of the present invention will now be described in detail. Referring to fig. 1, the wide-angle lens 1 includes, in order from an object side to an image side along an optical axis OA1, a first lens element L11, a second lens element L12, an aperture stop ST1, a third lens element L13, a fourth lens element L14, a fifth lens element L15, a sixth lens element L16, a filter OF1, and a cover glass CG1. When imaging, light from the object side is finally imaged on an imaging surface IMA 1. According to [ embodiments ] the first to third paragraphs, wherein: the object-side surface S114 and the image-side surface S115 OF the filter OF1 are both planar; the object-side surface S116 and the image-side surface S117 of the cover glass CG1 are both flat surfaces; by using the design that the lens, the diaphragm ST1 and at least one of the conditions (1) to (10) are satisfied, the wide-angle lens 1 can effectively improve the field of view, effectively improve the resolution and effectively correct the aberration.
Table one is a table of relevant parameters of each lens of the wide-angle lens 1 in fig. 1.
Watch 1
Figure BDA0003148832350000061
Figure BDA0003148832350000071
The second table shows the relevant parameters of the aspheric surface of the aspheric lens in the first table.
Watch two
Surface number k A B C D
S11 -1.044 -1.26E-04 -1.03E-05 1.35E-07 0
S12 -0.916 1.02E-03 3.39E-05 -3.23E-06 0
S13 0.000 -2.34E-03 1.17E-04 -1.34E-06 0
S14 -1.633 2.72E-03 -1.50E-04 9.20E-06 0
S16 0.000 0.00E+00 0.00E+00 0.00E+00 0
S17 -1514.254 9.01E-03 -1.21E-03 1.51E-04 -1.14E-05
S18 2.869 3.52E-03 -6.61E-04 1.19E-04 -9.29E-06
S19 0.000 -8.58E-03 7.23E-04 -5.75E-05 -1.01E-06
S110 -3.434 -3.52E-03 4.55E-04 -3.19E-05 7.06E-07
S111 -0.499 2.11E-03 -2.11E-04 1.03E-05 -2.19E-07
S112 0.000 2.06E-03 6.01E-05 -4.42E-06 1.94E-07
S113 0.000 5.23E-04 -1.31E-04 9.99E-08 6.61E-08
Table three shows the relevant parameter values of the wide-angle lens 1 of the first embodiment and the calculated values corresponding to the conditions (1) to (10), and it can be seen from table three that the wide-angle lens 1 of the first embodiment can satisfy the requirements of the conditions (1) to (10).
Watch III
CT2 3.50mm CT4 1.00mm CT5 4.08mm
CT6 0.94mm ∣R 11 /R 41 ∣ 0.72 R 21 /(R 12 +R 22 ) 4.99
R 42 /CT4 10.07 R 51 /(f2-CT5) 1.51 f2/(CT2-CT6) 4.89
∣R 61 /Nd1∣ 14.17mm ∣R 41 -f2∣ 23.90mm f1/(R 41 +f5) 2.00
(R 42 +R 41 )/R 32 0.19 R 42 /(Vd3/Vd4) 3.66mm
In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirement, and as can be seen from fig. 2A, the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between-0.08 mm and 0.03 mm. As can be seen from fig. 2B, the field curvature of the wide-angle lens 1 of the first embodiment is between-0.12 mm and 0.20 mm. As can be seen from fig. 2C, the wide-angle lens 1 of the first embodiment has a distortion of-16% to 9%. As shown in fig. 2D, the wide-angle lens 1 of the first embodiment has a relative illumination intensity of 0.47 to 1.0 in the Y-field of 0mm to 6.4mm for light with a wavelength of 0.5550 μm. It is obvious that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 1 of the first embodiment can be effectively corrected, and the relative illumination can also meet the requirements, thereby obtaining better optical performance.
Referring to fig. 3, fig. 3 is a schematic diagram of a lens configuration and an optical path of a wide-angle lens according to a second embodiment of the invention. The wide-angle lens 2 includes, in order from an object side to an image side along an optical axis OA2, a first lens L21, a second lens L22, an aperture stop ST2, a third lens L23, a fourth lens L24, a fifth lens L25, a sixth lens L26, a filter OF2, and a protective glass CG2. In imaging, light from the object side is finally imaged on an imaging surface IMA 2. According to [ embodiments ] the first to third paragraphs, wherein: the object-side surface S214 and the image-side surface S215 OF the filter OF2 are both flat surfaces; the object-side surface S216 and the image-side surface S217 of the cover glass CG2 are both flat; by using the design that the lens, the diaphragm ST2 and at least one of the conditions (1) to (10) are satisfied, the wide-angle lens 2 can effectively improve the field of view, effectively improve the resolution and effectively correct the aberration.
Table four is a table of the relevant parameters of each lens of the wide-angle lens 2 in fig. 3.
Watch four
Figure BDA0003148832350000081
Figure BDA0003148832350000091
Table five is a table of relevant parameters of the aspherical surface of the aspherical lens of table four.
Watch five
Surface number k A B C D
S21 -2.245 -2.77E-04 -2.03E-06 1.13E-07 0
S22 -0.911 1.15E-03 8.83E-05 -2.71E-06 0
S23 -1.923 -4.94E-03 1.17E-05 8.78E-06 0
S24 -1.740 4.05E-03 -4.75E-04 3.64E-05 0
S26 0.000 0.00E+00 0.00E+00 0.00E+00 0
S27 0.000 1.56E-02 -2.06E-03 2.95E-04 -2.36E-05
S28 3.382 6.19E-03 -1.06E-03 2.41E-04 -1.88E-05
S29 0.000 -1.24E-02 8.97E-04 -1.95E-05 -1.58E-05
S210 0.000 -3.77E-03 8.57E-04 -7.47E-05 2.27E-06
S211 2.491 3.42E-03 -4.07E-04 2.27E-05 -5.16E-07
S212 -0.094 3.16E-03 7.47E-05 -9.61E-06 4.27E-07
S213 -0.331 2.46E-03 -2.32E-04 2.74E-07 1.73E-07
Table six shows the relevant parameter values of the wide-angle lens 2 of the second embodiment and the calculated values corresponding to the conditions (1) to (10), and it can be seen from table six that the wide-angle lens 2 of the second embodiment can satisfy the requirements of the conditions (1) to (10).
Watch six
CT2 3.32mm CT4 0.81mm CT5 3.77mm
CT6 2.22mm ∣R 11 /R 41 ∣ 2.21 R 21 /(R 12 +R 22 ) 12.88
R 42 /CT4 38.75 R 51 /(f2-CT5) 3.24 f2/(CT2-CT6) 7.10
∣R 61 /Nd1∣ 5.65mm ∣R 41 -f2∣ 12.52mm f1/(R 41 +f5) -3.01
(R 42 +R 41 )/R 32 -4.44 R 42 /(Vd3/Vd4) 11.42mm
In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirement, and as can be seen from fig. 4A, the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between-0.20 mm and 0.05 mm. As can be seen from fig. 4B, the field curvature of the wide-angle lens 2 of the second embodiment is between-0.35 mm and 0.15 mm. As can be seen from fig. 4C, the wide-angle lens 2 of the second embodiment has a distortion of between-10% and 9%. As shown in fig. 4D, the wide-angle lens 2 of the second embodiment has a relative illumination intensity of 0.38 to 1.0 in the Y-field of 0mm to 6.4mm for light with a wavelength of 0.5550 μm. It is obvious that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected, and the relative illumination can also meet the requirements, thereby obtaining better optical performance.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating a lens configuration and an optical path of a wide-angle lens according to a third embodiment of the present invention. The wide-angle lens 3 includes, in order from an object side to an image side along an optical axis OA3, a first lens L31, a second lens L32, an aperture stop ST3, a third lens L33, a fourth lens L34, a fifth lens L35, a sixth lens L36, a filter OF3, and a protective glass CG3. In imaging, light from the object side is finally imaged on an imaging surface IMA 3. According to [ embodiments ] the first to third paragraphs, wherein: the object-side surface S314 and the image-side surface S315 OF the filter OF3 are both flat; the object-side surface S316 and the image-side surface S317 of the cover glass CG3 are both flat; by using the design that the lens, the diaphragm ST3 and at least one of the conditions (1) to (10) are satisfied, the wide-angle lens 3 can effectively improve the field of view, effectively improve the resolution and effectively correct the aberration.
Table seven is a table of parameters related to the respective lenses of the wide-angle lens 3 in fig. 5.
Watch seven
Figure BDA0003148832350000101
Table eight is a table of relevant parameters of the aspherical surfaces of the aspherical lenses in table seven.
Watch eight
Figure BDA0003148832350000102
Figure BDA0003148832350000111
Table nine shows the related parameter values of the wide-angle lens 3 of the third embodiment and the calculated values corresponding to the conditions (1) to (10), and it can be seen from table nine that the wide-angle lens 3 of the third embodiment can satisfy the requirements of the conditions (1) to (10).
Watch nine
CT2 3.19mm CT4 0.80mm CT5 3.54mm
CT6 2.22mm ∣R 11 /R 41 ∣ 2.35 R 21 /(R 12 +R 22 ) 13.33
R 42 /CT4 102.63 R 51 /(f2-CT5) 3.16 f2/(CT2-CT6) 7.99
∣R 61 /Nd1∣ 5.22mm ∣R 41 -f2∣ 12.13mm f1/(R 41 +f5) -2.51
(R 42 +R 41 )/R 32 -12.83 R 42 /(Vd3/Vd4) 29.84mm
In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirement, and as can be seen from fig. 6A, the longitudinal aberration of the wide-angle lens 3 of the third embodiment is between-0.20 mm and 0.05 mm. As can be seen from fig. 6B, the field curvature of the wide-angle lens 3 of the third embodiment is between-0.30 mm and 0.15 mm. As can be seen from fig. 6C, the wide-angle lens 3 of the third embodiment has a distortion of-12% to 8%. As shown in fig. 6D, the wide-angle lens 3 of the third embodiment has a relative illumination intensity of 0.40 to 1.0 in the Y-field of 0mm to 6.4mm for light with a wavelength of 0.5550 μm. It is obvious that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected, and the relative illumination can also meet the requirements, thereby obtaining better optical performance.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims (10)

1. A wide-angle lens, comprising:
the first lens has negative refractive power and is a meniscus lens;
the second lens has positive refractive power and is a meniscus lens;
the third lens has refractive power;
the fourth lens element with negative refractive power has a concave surface facing the object side and a concave surface facing the image side;
the fifth lens has positive refractive power and comprises a convex surface facing the object side; and
the sixth lens has refractive power, and comprises a concave surface facing the object side;
the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially disposed along an optical axis from an object side to an image side.
2. The wide-angle lens of claim 1, wherein the third lens has positive power and the sixth lens has positive power.
3. The wide-angle lens of claim 2, wherein the first lens element comprises a convex surface facing the object side and a concave surface facing the image side.
4. The wide-angle lens of claim 2, wherein the second lens element comprises a concave surface facing the object side and a convex surface facing the image side.
5. The wide-angle lens of claim 2, wherein the third lens element is a biconvex lens element and comprises a convex surface facing the object side and another convex surface facing the image side.
6. The wide-angle lens of claim 2, wherein the fifth lens element is biconvex and further comprises another convex surface facing the image side.
7. The wide-angle lens of claim 2, wherein the sixth lens element is a meniscus lens element and further comprises a convex surface facing the image side.
8. The wide-angle lens of claim 1, further comprising an aperture stop disposed between the second lens element and the third lens element.
9. The wide-angle lens of any one of claims 1 to 8, wherein the wide-angle lens satisfies at least one of the following conditions:
0.6<∣R 11 /R 41 ∣<2.4；
4<R 21 /(R 12 +R 22 )<13.5；
9.9<R 42 /CT4<103；
1.3<R 51 /(f2-CT5)<3.5；
4<f2/(CT2-CT6)<8.2；
wherein R is 11 Is the radius of curvature, R, of the object-side surface of the first lens 12 Is the radius of curvature, R, of the image-side surface of the first lens 21 Is the radius of curvature, R, of the object-side surface of the second lens 22 Is the radius of curvature, R, of the image-side surface of the second lens 41 Is the radius of curvature, R, of the object-side surface of the fourth lens 42 Is the radius of curvature, R, of the image-side surface of the fourth lens 51 The curvature radius of the object-side surface of the fifth lens element, CT2 is the distance between the object-side surface and the image-side surface of the second lens element, CT4 is the distance between the object-side surface and the image-side surface of the fourth lens element, CT5 is the distance between the object-side surface and the image-side surface of the fifth lens element, and CT6 isThe distance between the object side surface and the image side surface of the sixth lens element on the optical axis, and f2 is the effective focal length of the second lens element.
10. The wide-angle lens of any one of claims 1 to 8, wherein the wide-angle lens satisfies the following condition:
-13<(R 42 +R 41 )/R 32 <0.3；
5mm<∣R 61 /Nd1∣<15mm；
11mm<∣R 41 -f2∣<25mm；
-3.2<f1/(R 41 +f5)<2.3；
3.3mm<R 42 /(Vd3/Vd4)<30mm；
wherein R is 32 Is the radius of curvature, R, of the image-side surface of the third lens 41 Is the radius of curvature, R, of the object-side surface of the fourth lens 42 Is the radius of curvature, R, of the image-side surface of the fourth lens 61 The curvature radius of the object-side surface of the sixth lens element is defined as Nd1, the refractive index of the first lens element, f1, the effective focal length of the first lens element, f2, f5, the effective focal length of the second lens element, vd3, and Vd4, respectively.
CN202110759874.5A 2021-07-05 2021-07-05 Wide-angle lens Pending CN115586619A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202110759874.5A CN115586619A (en) 2021-07-05 2021-07-05 Wide-angle lens
US17/834,991 US20230020801A1 (en) 2021-07-05 2022-06-08 Wide-Angle Lens Assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110759874.5A CN115586619A (en) 2021-07-05 2021-07-05 Wide-angle lens

Publications (1)

Publication Number Publication Date
CN115586619A true CN115586619A (en) 2023-01-10

Family

ID=84771107

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110759874.5A Pending CN115586619A (en) 2021-07-05 2021-07-05 Wide-angle lens

Country Status (1)

Country Link
CN (1) CN115586619A (en)

Similar Documents

Publication Publication Date Title
US10859795B2 (en) Lens assembly
US10133034B2 (en) Projection lens assembly
CN111487744B (en) Imaging lens
CN111722356B (en) Imaging lens
US10955645B2 (en) Wide-angle lens assembly
CN110888225B (en) Imaging lens
US11698512B2 (en) Wide-angle lens assembly
US20210181486A1 (en) Wide-Angle Lens Assembly
CN112462485B (en) Imaging lens
CN111290099B (en) Imaging lens
TWI679447B (en) Lens assembly
CN115728918A (en) Wide-angle lens
CN112987233B (en) Wide-angle lens
CN113009678B (en) Wide-angle lens
CN115586619A (en) Wide-angle lens
TW202225770A (en) Wide-angle lens assembly
CN113933958A (en) Imaging lens
TWI821702B (en) Wide-angle lens assembly
TWI786810B (en) Wide-angle lens assembly
CN112485883B (en) Imaging lens
TWI815459B (en) Lens assembly
CN114442262B (en) Imaging lens
CN115047586B (en) Imaging lens
CN112485884B (en) Wide-angle lens
TWI746031B (en) Lens assembly

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination