CN112578530A - Imaging lens - Google Patents

Imaging lens Download PDF

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Publication number
CN112578530A
CN112578530A CN201910923848.4A CN201910923848A CN112578530A CN 112578530 A CN112578530 A CN 112578530A CN 201910923848 A CN201910923848 A CN 201910923848A CN 112578530 A CN112578530 A CN 112578530A
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China
Prior art keywords
lens
refractive power
lens element
imaging
positive refractive
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CN201910923848.4A
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Chinese (zh)
Inventor
姚淳飏
张锡龄
陈建宏
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Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
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Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
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Application filed by Sintai Optical Shenzhen Co Ltd, Asia Optical Co Inc filed Critical Sintai Optical Shenzhen Co Ltd
Priority to CN201910923848.4A priority Critical patent/CN112578530A/en
Priority to US17/004,255 priority patent/US11668902B2/en
Publication of CN112578530A publication Critical patent/CN112578530A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • 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
    • G02B13/18—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

An imaging lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has a positive refractive power. The second lens has a positive refractive power. The third lens has refractive power and is a meniscus lens. The fourth lens has positive refractive power. The fifth lens has refractive power and is a meniscus lens. The first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are arranged along an optical axis in order from an object side to an image side. The imaging lens satisfies the following conditions: TTL is more than or equal to 8mm and less than or equal to 9 mm; wherein, TTL is a distance on the optical axis from the object side surface of the first lens element to the image plane.

Description

Imaging lens
Technical Field
The invention relates to an imaging lens.
Background
The development trend of the existing imaging lens is continuously towards miniaturization development, and along with different application requirements, the existing imaging lens still needs to have the characteristics of high resolution and environmental temperature change resistance, and the existing imaging lens cannot meet the existing requirements, and needs to have another imaging lens with a new framework to meet the requirements of miniaturization, high resolution and environmental temperature change resistance.
Disclosure of Invention
The present invention is directed to an imaging lens, and provides an imaging lens with a shorter total length, a higher resolution, and an environmental temperature change resistance, but still having good optical performance, aiming at the defect that the imaging lens in the prior art cannot simultaneously satisfy the requirements of miniaturization, high resolution, and environmental temperature change resistance.
The present invention provides an imaging lens including a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens has a positive refractive power. The second lens has a positive refractive power. The third lens has refractive power and is a meniscus lens. The fourth lens has positive refractive power. The fifth lens has refractive power and is a meniscus lens. The first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are arranged along an optical axis in order from an object side to an image side. The imaging lens satisfies the following conditions: TTL is more than or equal to 8mm and less than or equal to 9 mm; wherein, TTL is a distance on the optical axis from the object side surface of the first lens element to the image plane.
Another imaging lens of the invention includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has a positive refractive power. The second lens has a positive refractive power. The third lens has refractive power and is a meniscus lens. The fourth lens has positive refractive power. The fifth lens has refractive power and is a meniscus lens. The first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are arranged along an optical axis in order from an object side to an image side. The imaging lens satisfies the following conditions: TE is more than or equal to 0.5 and less than or equal to 1.41; wherein, T is the thickness of the first lens on the optical axis, and E is the thickness of the outermost edge of the first lens.
Another imaging lens of the invention includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has a positive refractive power. The second lens has a positive refractive power. The third lens has refractive power and is a meniscus lens. The fourth lens has positive refractive power. The fifth lens has refractive power and is a meniscus lens. The first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are arranged along an optical axis in order from an object side to an image side. The imaging lens satisfies the following conditions: d is f2, D is more than or equal to 2.85mm and less than or equal to 2.95 mm; where D is the effective diameter of the entrance pupil of the imaging lens and f is the effective focal length of the imaging lens.
Another imaging lens of the invention includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has a positive refractive power. The second lens has a positive refractive power. The third lens has refractive power and is a meniscus lens. The fourth lens has positive refractive power. The fifth lens has refractive power and is a meniscus lens. The first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are arranged along an optical axis in order from an object side to an image side. The imaging lens satisfies the following conditions: FOV is more than or equal to 55 degrees and less than or equal to 65 degrees; wherein, the FOV is a full field of view of the imaging lens.
Another imaging lens of the invention includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has a positive refractive power. The second lens has a positive refractive power. The third lens has refractive power and is a meniscus lens. The fourth lens has positive refractive power. The fifth lens has refractive power and is a meniscus lens. The first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are arranged along an optical axis in order from an object side to an image side. The imaging lens satisfies the following conditions: nd (neodymium)1Not less than 1.9; wherein, Nd1Is the refractive index of the first lens.
Another imaging lens of the invention includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has positive refractive power. The second lens has a positive refractive power. The third lens has refractive power and is a meniscus lens. The fourth lens has positive refractive power. The fifth lens has refractive power and is a meniscus lens. The first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are arranged along an optical axis in order from an object side to an image side. The imaging lens satisfies the following conditions: vd1<20; wherein, Vd1Is the abbe number of the first lens.
Another imaging lens of the invention includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has a positive refractive power. The second lens has a positive refractive power. The third lens has refractive power and is a meniscus lens. The fourth lens has positive refractive power. The fifth lens has refractive power and is a meniscus lens. The first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are arranged along an optical axis in order from an object side to an image side. The imaging lens satisfies the following conditions: TCE is more than or equal to 0 ℃ and less than 10 multiplied by 10-6DEG C; wherein TCE is the coefficient of thermal expansion of the first lens.
The first lens and the fourth lens are made of glass material, the second lens, the third lens and the fifth lens are made of plastic material, and the lens further comprises an aperture which is arranged between the first lens and the second lens.
The fourth lens element includes a convex surface facing the object side and another convex surface facing the image side.
The fifth lens element includes a convex surface facing the object side and a concave surface facing the image side.
Formula Nd1Not less than 1.9, which is helpful to control the size of the optical effective diameter of the lens, and the optimal effect range is not less than 2.2 Nd1More than or equal to 1.9, and the miniaturization of the lens is facilitated if the range is met. Formula Vd1<20, can help to strengthen the chromatic aberration correcting capability of the first lens, and the best effect range is 17<Vd1<20 according to theThe range has the best achromatic conditions.
The imaging lens has the following beneficial effects: the lens has the advantages of short total length, high resolution, environmental temperature change resistance and good optical performance.
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 a lens configuration and an optical path of an imaging lens according to a first embodiment of the invention.
Fig. 2A is a Field Curvature (Field Curvature) diagram of the first embodiment of the imaging lens according to the present invention.
Fig. 2B is a Distortion (aberration) diagram of the first embodiment of the imaging lens according to the present invention.
Fig. 2C is a Modulation Transfer Function (Modulation Transfer Function) diagram of the imaging lens according to the first embodiment of the invention.
Fig. 3 is a lens arrangement and an optical path diagram of an imaging lens according to a second embodiment of the invention.
Fig. 4A is a field curvature diagram of a second embodiment of an imaging lens according to the present invention.
Fig. 4B is a distortion diagram of the second embodiment of the imaging lens according to the present invention.
Fig. 4C is a diagram of modulation transfer functions of the imaging lens according to the second embodiment of the invention.
Fig. 5 is a lens arrangement and an optical path diagram of a third embodiment of an imaging lens according to the invention.
Fig. 6A is a field curvature diagram of a third embodiment of an imaging lens according to the present invention.
Fig. 6B is a distortion diagram of a third embodiment of an imaging lens according to the present invention.
Fig. 6C is a diagram of a modulation transfer function of an imaging lens according to a third embodiment of the invention.
Fig. 7 is a schematic diagram of a lens configuration and an optical path of an imaging lens according to a fourth embodiment of the invention.
Fig. 8A is a field curvature diagram of a fourth embodiment of an imaging lens according to the present invention.
Fig. 8B is a distortion diagram of a fourth embodiment of an imaging lens according to the present invention.
Fig. 8C is a diagram of a modulation transfer function of a fourth embodiment of an imaging lens according to the invention.
Detailed Description
The present invention provides an imaging lens, including: the first lens has positive refractive power; the second lens has positive refractive power; the third lens has refractive power and is a meniscus lens; the fourth lens has positive refractive power; and a fifth lens element having refractive power, the fifth lens element being a meniscus lens element; the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis; the imaging lens satisfies the following conditions: TTL is more than or equal to 8mm and less than or equal to 9 mm; wherein, TTL is a distance on the optical axis from the object side surface of the first lens element to the image plane.
The present invention provides another imaging lens including: the first lens has positive refractive power; the second lens has positive refractive power; the third lens has refractive power and is a meniscus lens; the fourth lens has positive refractive power; and a fifth lens element having refractive power, the fifth lens element being a meniscus lens element; the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis; the imaging lens satisfies the following conditions: TE is more than or equal to 0.5 and less than or equal to 1.41; wherein, T is the thickness of the first lens on the optical axis, and E is the thickness of the outermost edge of the first lens.
The present invention provides another imaging lens including: the first lens has positive refractive power; the second lens has positive refractive power; the third lens has refractive power and is a meniscus lens; the fourth lens has positive refractive power; and a fifth lens element having refractive power, the fifth lens element being a meniscus lens element; the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis; the imaging lens satisfies the following conditions: d is f2, D is more than or equal to 2.85mm and less than or equal to 2.95 mm; where D is the effective diameter of the entrance pupil of the imaging lens and f is the effective focal length of the imaging lens.
The present invention provides another imaging lens including: the first lens has positive refractive power; the second lens has positive refractive power; the third lens has refractive power and is a meniscus lens; the fourth lens has positive refractive power; and a fifth lens element having refractive power, the fifth lens element being a meniscus lens element; the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis; the imaging lens satisfies the following conditions: FOV is more than or equal to 55 degrees and less than or equal to 65 degrees; wherein, the FOV is a full field of view of the imaging lens.
The present invention provides another imaging lens including: the first lens has positive refractive power; the second lens has positive refractive power; the third lens has refractive power and is a meniscus lens; the fourth lens has positive refractive power; and a fifth lens element having refractive power, the fifth lens element being a meniscus lens element; the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis; the imaging lens satisfies the following conditions: nd (neodymium)1Not less than 1.9; wherein, Nd1Is the refractive index of the first lens.
The present invention provides another imaging lens including: the first lens has positive refractive power; the second lens has positive refractive power; the third lens has refractive power and is a meniscus lens; the fourth lens has positive refractive power; and a fifth lens element having refractive power, the fifth lens element being a meniscus lens element; the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis; the imaging lens satisfies the following conditions: vd1<20; wherein, Vd1Is the abbe number of the first lens.
The present invention provides another imaging lens including: the first lens has positive refractive power; the second lens has positive refractive power; the third lens has refractive power and is a meniscus lens; the fourth lens has positive refractive power; and a fifth lens element having refractive power, the fifth lens element being a meniscus lens element; wherein the first lens, the second lens,The third lens element, the fourth lens element and the fifth lens element are arranged along an optical axis in order from an object side to an image side; the imaging lens satisfies the following conditions: TCE is more than or equal to 0/DEG C and less than 10 multiplied by 10-6/° c; wherein TCE is the coefficient of thermal expansion of the first lens.
Please refer to the following tables i, ii, iv, v, seventh, eighth, tenth and eleventh, wherein tables i, iv, seventh and tenth are the related parameter tables of the lenses according to the first to fourth embodiments of the imaging lens of the present invention, respectively, and tables ii, iv, eighth and eleventh are the related parameter tables of the aspheric surfaces of the aspheric lenses of tables i, iv, seventh and tenth, respectively.
Fig. 1, 3, 5, and 7 are schematic diagrams of lens configurations and optical paths of first, second, third, and fourth embodiments of the imaging lens of the present invention, respectively, wherein the first lenses L11, L21, L31, and L41 are meniscus lenses having positive refractive power, and are made of glass materials, and the object-side surfaces S11, S21, S31, and S41 are convex surfaces, the image-side surfaces S12, S22, S32, and S42 are concave surfaces, and the object-side surfaces S11, S21, S31, S41, the image-side surfaces S12, S22, S32, and S42 are spherical surfaces.
The second lenses L12, L22, L32, and L42 are meniscus lenses having positive refractive power, and are made of plastic material, and have concave object-side surfaces S14, S24, S34, and S44, convex image-side surfaces S15, S25, S35, and S45, and aspheric object-side surfaces S14, S24, S34, and S44 and image-side surfaces S15, S25, S35, and S45.
The third lenses L13, L23, L33, and L43 are meniscus lenses having negative refractive power, and are made of plastic material, and have concave object-side surfaces S16, S26, S36, and S46, convex image-side surfaces S17, S27, S37, and S47, and aspheric object-side surfaces S16, S26, S36, and S46 and image-side surfaces S17, S27, S37, and S47.
The fourth lenses L14, L24, L34, and L44 are biconvex lenses having positive refractive power, and are made of glass material, and have convex object-side surfaces S18, S28, S38, and S48, convex image-side surfaces S19, S29, S39, and S49, and spherical surfaces on the object-side surfaces S18, S28, S38, and S48 and the image-side surfaces S19, S29, S39, and S49.
The fifth lenses L15, L25, L35, and L45 are meniscus lenses having negative refractive power, and are made of plastic material, wherein the object-side surfaces S110, S210, S310, and S410 are convex surfaces, the image-side surfaces S111, S211, S311, and S411 are concave surfaces, and the object-side surfaces S110, S210, S310, and S410 and the image-side surfaces S111, S211, S311, and S411 are aspheric surfaces.
In addition, the imaging lenses 1, 2, 3, 4 at least satisfy one of the following conditions:
D＝f/2，2.85mm≤D≤2.95mm (1)
FOV is more than or equal to 55 degrees and less than or equal to 65 degrees (2)
8mm≤TTL≤9mm (3)
Nd1≥1.9 (4)
0.5≤T/E≤1.41 (5)
0/℃≤TCE＜10×10-6/℃ (6)
Vd1<20 (7)
2.2≥Nd1≥1.9 (8)
17<Vd1<20 (9)
Wherein f is an effective focal length of the imaging lenses 1, 2, 3, 4, D is an effective diameter of the entrance pupils of the imaging lenses 1, 2, 3, 4, FOV is a full field of view of the imaging lenses 1, 2, 3, 4, TTL is an object-side surface S11, S21, S31, S41 of the first lenses L11, L21, L31, L41 to the imaging surfaces IMA1, IMA2, IMA3, IMA4 to the distances among the optical axes OA1, OA2, OA3, OA4, Nd 4, in the first to fourth embodiments, and Nd is an effective focal length of the imaging lenses 1, 2, 3, 4, D is an effective diameter of the entrance pupils of the imaging lenses 1, 2, 3, 4, in the first to fourth embodiments, and TTL is an effective field of the first to fourth embodiments, respectively1In the first to fourth embodiments, refractive indexes of the first lenses L11, L21, L31, and L41, T is thicknesses of the first lenses L11, L21, L31, and L41 on optical axes OA1, OA2, OA3, and OA4 in the first to fourth embodiments, E is thicknesses of outermost edges of the first lenses L11, L21, L31, and L41 in the first to fourth embodiments, and TCE is thermal expansion coefficients of the first lenses L11, L21, L31, and L41 in the first to fourth embodiments, and Vd is a refractive index of the first lenses L11, L21, L31, and L41 in the first to fourth embodiments1Abbe numbers of the first lenses L11, L21, L31, L41 in the first to fourth embodiments. So that the total length of the imaging lenses 1, 2, 3 and 4 can be effectively reduced,The resolution ratio is effectively improved, the environment temperature change is effectively resisted, the aberration is effectively corrected, and the chromatic aberration is effectively corrected.
A first embodiment of the imaging lens of the present invention will now be described in detail. Referring to fig. 1, the imaging lens 1 includes, in order from an object side to an image side along an optical axis OA1, a first lens element L11, an aperture stop ST1, a second lens element L12, a third lens element L13, a fourth lens element L14, a fifth lens element L15, and a filter OF 1. In imaging, light from the object side is finally imaged on the imaging surface IMA 1. According to [ embodiments ] the first to thirteenth paragraphs, wherein:
the filter OF1 has an object-side surface S112 and an image-side surface S113 both being planar;
by using the design that the lens, the diaphragm ST1 at least satisfy one of the conditions (1) to (7), the imaging lens 1 can effectively reduce the total length of the lens, effectively improve the resolution, effectively resist the environmental temperature change, effectively correct the aberration, and effectively correct the chromatic aberration.
If condition (4) is Nd1A value of less than 1.9, the ability to assist in controlling the size of the lens' effective optical path is reduced. Thus, Nd1Must be at least 1.9 or more, so that the optimum effective range is 2.2. gtoreq.Nd1More than or equal to 1.9, and the miniaturization of the lens is facilitated if the range is met.
Table one is a table of relevant parameters of each lens of the imaging lens 1 in fig. 1.
Watch 1
Figure BDA0002218347160000081
The aspherical surface sag z of the aspherical lens in table i is obtained by the following equation:
z＝ch2/{1+[1-(k+1)c2h2]1/2}+Ah4+Bh6+Ch8+Dh10+Eh12+Fh14+Gh16
wherein:
c: a curvature;
h: the vertical distance from any point on the surface of the lens to the optical axis;
k: a cone coefficient;
a to G: an aspheric surface coefficient.
The second table is a table of the relevant parameters of the aspheric surface of the aspheric lens in the first table, where k is the Conic coefficient (Conic Constant) and A-G are aspheric coefficients.
Watch two
Figure BDA0002218347160000082
Figure BDA0002218347160000091
Table three shows the related parameter values of the imaging lens 1 of the first embodiment and the calculated values corresponding to the conditions (1) to (7), and it can be seen from table three that the imaging lens 1 of the first embodiment can satisfy the requirements of the conditions (1) to (7).
Watch III
Figure BDA0002218347160000092
In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirement, and as can be seen from fig. 2A, the curvature of field of the imaging lens 1 of the first embodiment is between-0.03 mm and 0.05 mm. As can be seen from fig. 2B, the distortion of the imaging lens 1 of the first embodiment is between 0% and 2.5%. As shown in fig. 2C, the modulation transfer function value of the imaging lens 1 of the first embodiment is between 0.66 and 1.0.
It is apparent that the curvature of field and distortion of the imaging lens 1 of the first embodiment can be effectively corrected, and the lens resolution 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 an imaging lens according to a second embodiment of the invention. The imaging lens 2 includes, in order from an object side to an image side along an optical axis OA2, a first lens element L21, an aperture stop ST2, a second lens element L22, a third lens element L23, a fourth lens element L24, a fifth lens element L25, and a filter OF 2. In imaging, light from the object side is finally imaged on the imaging surface IMA 2. According to [ embodiments ] the first to thirteenth paragraphs, wherein:
the filter OF2 has an object-side surface S212 and an image-side surface S213 both being planar;
by using the design that the lens, the diaphragm ST2 at least satisfy one of the conditions (1) to (7), the imaging lens 2 can effectively reduce the total length of the lens, effectively increase the resolution, effectively resist the environmental temperature change, effectively correct the aberration, and effectively correct the chromatic aberration.
If condition (7) Vd1If the value of (b) is greater than 20, the chromatic aberration correction capability of the first lens L11 is degraded. Thus, Vd1Must be at least less than 20, so that the optimum effect range is 17<Vd1<If the range is satisfied, the optimum achromatization condition is satisfied.
Table four is a table of relevant parameters of each lens of the imaging lens 2 in fig. 3.
Watch four
Figure BDA0002218347160000101
The aspherical surface concavity z of the aspherical lens in table four is defined as in the first embodiment. Table five is a table of the relevant parameters of the aspheric surface of the aspheric lens in table four, and the definition of the relevant coefficients is the same as that of the first embodiment, which is not repeated herein.
Watch five
Figure BDA0002218347160000102
Figure BDA0002218347160000111
Table six shows the related parameter values of the imaging lens 2 of the second embodiment and the calculated values corresponding to the conditions (1) to (7), and it can be seen from table six that the imaging lens 2 of the second embodiment can satisfy the requirements of the conditions (1) to (7).
Watch six
Figure BDA0002218347160000112
In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirement, and as can be seen from fig. 4A, the curvature of field of the imaging lens 2 of the second embodiment is between-0.04 mm and 0.05 mm. As can be seen from fig. 4B, the distortion of the imaging lens 2 of the second embodiment is between 0% and 1.6%. As shown in fig. 4C, the modulation transfer function value of the imaging lens 2 of the second embodiment is between 0.67 and 1.0.
It is apparent that the curvature of field, distortion of the imaging lens 2 of the second embodiment can be effectively corrected, and the lens resolution 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 an imaging lens according to a third embodiment of the invention. The imaging lens 3 includes, in order from an object side to an image side along an optical axis OA3, a first lens element L31, an aperture stop ST3, a second lens element L32, a third lens element L33, a fourth lens element L34, a fifth lens element L35, and a filter OF 3. In imaging, light from the object side is finally imaged on the imaging surface IMA 3. According to [ embodiments ] the first to thirteenth paragraphs, wherein:
the filter OF3 has an object-side surface S312 and an image-side surface S313 that are both planar;
by using the design that the lens, the diaphragm ST3 at least satisfy one of the conditions (1) to (7), the imaging lens 3 can effectively reduce the total length of the lens, effectively increase the resolution, effectively resist the environmental temperature change, effectively correct the aberration, and effectively correct the chromatic aberration.
Table seven is a table of relevant parameters of each lens of the imaging lens 3 in fig. 5.
Watch seven
Figure BDA0002218347160000113
Figure BDA0002218347160000121
The aspherical surface concavity z of the aspherical lens in table seven is as defined in the first embodiment. Table eight is a table of relevant parameters of the aspheric surface of the aspheric lens in table seven, and the definition of the relevant coefficients is the same as that of the first embodiment, which is not repeated herein.
Table eight
Figure BDA0002218347160000122
Table nine shows the values of the parameters associated with the imaging lens 3 of the third embodiment and the calculated values corresponding to the conditions (1) to (7), and it can be seen from table nine that the imaging lens 3 of the third embodiment can satisfy the requirements of the conditions (1) to (7).
Watch nine
Figure BDA0002218347160000123
In addition, the optical performance of the imaging lens 3 of the third embodiment can also meet the requirement, and as can be seen from fig. 6A, the curvature of field of the imaging lens 3 of the third embodiment is between-0.035 mm and 0.045 mm. As can be seen from fig. 6B, the distortion of the imaging lens 3 of the third embodiment is between 0% and 1.6%. As can be seen from fig. 6C, the modulation transfer function value of the imaging lens 3 of the third embodiment is between 0.67 and 1.0.
It is obvious that the curvature of field and distortion of the imaging lens 3 of the third embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.
Referring to fig. 7, fig. 7 is a schematic diagram illustrating a lens configuration and an optical path of an imaging lens according to a fourth embodiment of the invention. The imaging lens 4 includes, in order from an object side to an image side along an optical axis OA4, a first lens element L41, an aperture stop ST4, a second lens element L42, a third lens element L43, a fourth lens element L44, a fifth lens element L45, and a filter OF 4. In imaging, light from the object side is finally imaged on the imaging surface IMA 4. According to [ embodiments ] the first to thirteenth paragraphs, wherein:
the filter OF4 has an object-side surface S412 and an image-side surface S413 that are both planar;
by using the design that the lens, the diaphragm ST4 at least satisfy one of the conditions (1) to (7), the imaging lens 4 can effectively reduce the total lens length, effectively increase the resolution, effectively resist the environmental temperature change, effectively correct the aberration, and effectively correct the chromatic aberration.
Table ten is a table of relevant parameters of each lens of the imaging lens 4 in fig. 7.
Watch ten
Figure BDA0002218347160000131
The aspherical surface concavity z of the aspherical lens in table ten is as defined in the first embodiment. Table eleven is a table of relevant parameters of the aspheric surface of the aspheric lens in table eleven, and the definition of the relevant coefficients is the same as that of the first embodiment, which is not repeated herein.
Watch eleven
Figure BDA0002218347160000141
Table twelve shows the related parameter values of the imaging lens 4 of the fourth embodiment and the calculated values corresponding to the conditions (1) to (7), and it can be seen from table twelve that the imaging lens 4 of the fourth embodiment can satisfy the requirements of the conditions (1) to (7).
Watch twelve
Figure BDA0002218347160000142
In addition, the optical performance of the imaging lens 4 of the fourth embodiment can also meet the requirement, and as can be seen from fig. 8A, the curvature of field of the imaging lens 4 of the fourth embodiment is between-0.04 mm and 0.035 mm. As can be seen from fig. 8B, the distortion of the imaging lens 4 of the fourth embodiment is between 0% and 1.6%. As shown in fig. 8C, the modulation transfer function value of the imaging lens 4 of the fourth embodiment is between 0.66 and 1.0.
It is obvious that the curvature of field and distortion of the imaging lens 4 of the fourth embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims (10)

1. An imaging lens, characterized by comprising:
the first lens has positive refractive power;
the second lens has positive refractive power;
the third lens has refractive power and is a meniscus lens;
the fourth lens has positive refractive power; and
the fifth lens has refractive power and is a meniscus lens;
wherein the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis;
the imaging lens meets the following conditions:
8mm≤TTL≤9mm；
wherein, TTL is a distance between an object side surface of the first lens element and an image plane on the optical axis.
2. An imaging lens, characterized by comprising:
the first lens has positive refractive power;
the second lens has positive refractive power;
the third lens has refractive power and is a meniscus lens;
the fourth lens has positive refractive power; and
the fifth lens has refractive power and is a meniscus lens;
wherein the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis;
the imaging lens meets the following conditions:
0.5≤T/E≤1.41；
wherein T is the thickness of the first lens element on the optical axis, and E is the thickness of the outermost edge of the first lens element.
3. An imaging lens, characterized by comprising:
the first lens has positive refractive power;
the second lens has positive refractive power;
the third lens has refractive power and is a meniscus lens;
the fourth lens has positive refractive power; and
the fifth lens has refractive power and is a meniscus lens;
wherein the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis;
the imaging lens meets the following conditions:
D＝f/2，2.85mm≤D≤2.95mm；
wherein D is the effective diameter of the entrance pupil of the imaging lens, and f is the effective focal length of the imaging lens.
4. An imaging lens, characterized by comprising:
the first lens has positive refractive power;
the second lens has positive refractive power;
the third lens has refractive power and is a meniscus lens;
the fourth lens has positive refractive power; and
the fifth lens has refractive power and is a meniscus lens;
wherein the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis;
the imaging lens meets the following conditions:
FOV is more than or equal to 55 degrees and less than or equal to 65 degrees;
wherein, the FOV is a full field of view of the imaging lens.
5. An imaging lens, characterized by comprising:
the first lens has positive refractive power;
the second lens has positive refractive power;
the third lens has refractive power and is a meniscus lens;
the fourth lens has positive refractive power; and
the fifth lens has refractive power and is a meniscus lens;
wherein the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis;
the imaging lens meets the following conditions:
Nd1≥1.9；
wherein, Nd1Is the refractive index of the first lens.
6. An imaging lens, characterized by comprising:
the first lens has positive refractive power;
the second lens has positive refractive power;
the third lens has refractive power and is a meniscus lens;
the fourth lens has positive refractive power; and
the fifth lens has refractive power and is a meniscus lens;
wherein the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis;
the imaging lens meets the following conditions:
Vd1<20；
wherein, Vd1Is the abbe number of the first lens.
7. An imaging lens, characterized by comprising:
the first lens has positive refractive power;
the second lens has positive refractive power;
the third lens has refractive power and is a meniscus lens;
the fourth lens has positive refractive power; and
the fifth lens has refractive power and is a meniscus lens;
wherein the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are sequentially arranged from an object side to an image side along an optical axis;
the imaging lens meets the following conditions:
0/℃≤TCE＜10×10-6/℃；
wherein TCE is the thermal expansion coefficient of the first lens.
8. The imaging lens according to any one of claims 1 to 7, wherein the first lens element and the fourth lens element are made of glass, the second lens element, the third lens element and the fifth lens element are made of plastic, and further comprising an aperture stop disposed between the first lens element and the second lens element.
9. The imaging lens according to any one of claims 1 to 7,
the first lens element includes a convex surface facing the object side and a 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; and
the fourth lens element includes a convex surface facing the object side and another convex surface facing the image side.
10. The imaging lens according to any one of claims 1 to 7,
the third lens element includes a concave surface facing the object side and a convex surface facing the image side; and
the fifth lens element includes a convex surface facing the object side and a concave surface facing the image side;
the imaging lens at least meets one of the following conditions:
2.2≥Nd1≥1.9；
17<Vd1<20；
wherein, Nd1Is the refractive index of the first lens, Vd1Is the abbe number of the first lens.
CN201910923848.4A 2019-09-27 2019-09-27 Imaging lens Pending CN112578530A (en)

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