CN113552701A - Optical imaging lens - Google Patents

Optical imaging lens Download PDF

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Publication number
CN113552701A
CN113552701A CN202110980069.5A CN202110980069A CN113552701A CN 113552701 A CN113552701 A CN 113552701A CN 202110980069 A CN202110980069 A CN 202110980069A CN 113552701 A CN113552701 A CN 113552701A
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lens
optical
image
optical imaging
axis
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徐武超
王金超
戴付建
赵烈烽
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN202110980069.5A priority Critical patent/CN113552701A/en
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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
    • 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

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

The invention discloses an optical imaging lens, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having a negative refractive power, the object-side surface of which is convex; a diaphragm; a third lens having optical power; a fourth lens having an optical power; a fifth lens having a positive optical power; a sixth lens having optical power; wherein the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: 1.0 < R3/R4 < 3.5. The positive and negative distribution of the focal power of each component of the control system is reasonable, the low-order aberration of the control system can be effectively balanced, the tolerance sensitivity can be reduced by controlling the curvature radius ratio of the second lens, and the miniaturization of the system is maintained. By reasonably controlling the ratio, the inclination angles of the image side surface of the third lens and the image side surface of the second lens can be effectively controlled, and the ghost risk between the third lens and the second lens is reduced.

Description

Optical imaging lens
Technical Field
The invention belongs to the field of optical imaging, and particularly relates to an optical imaging lens comprising six lenses.
Background
With the popularization of portable electronic products such as mobile phones and tablet computers, people put higher demands on the diversity of functions of the electronic products. Meanwhile, with the development of scientific technology, the camera shooting technology is more mature, and higher requirements are provided for the imaging quality. Therefore, the invention provides the camera lens group based on the infrared band, which has small distortion and can obtain good imaging effect on the basis of ensuring the miniaturization and ultrathin characteristics of the lens.
Disclosure of Invention
The invention aims to provide an optical imaging lens consisting of six lenses, which has small distortion and good imaging effect on the basis of ensuring the miniaturization and ultrathin characteristics of the lens.
The present invention provides an optical imaging lens, sequentially comprising, from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having a negative refractive power, the object-side surface of which is convex; a diaphragm; a third lens having optical power; a fourth lens having an optical power; a fifth lens having a positive optical power; a sixth lens having optical power; wherein a radius of curvature R3 of the second lens object side surface and a radius of curvature R4 of the second lens image side surface satisfy: 1.0 < R3/R4 < 3.5.
According to an embodiment of the present application, an on-axis distance SAG31 between an intersection of the third lens object-side surface and the optical axis to an effective radius vertex of the third lens object-side surface and an on-axis distance SAG21 between an intersection of the second lens object-side surface and the optical axis to an effective radius vertex of the second lens object-side surface satisfy: 2.4 < SAG31/SAG21 < 6.8.
According to one embodiment of the present application, the maximum field angle FOV of the optical imaging lens satisfies: FOV > 90.
According to one embodiment of the present application, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 2.5.
According to one embodiment of the present application, an on-axis distance TTL from an object-side surface of the first lens to the imaging surface and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.6.
According to an embodiment of the present application, an on-axis distance SAG51 between an intersection of the fifth lens object-side surface and the optical axis to an effective radius vertex of the fifth lens object-side surface and an on-axis distance SAG62 between an intersection of the sixth lens image-side surface and the optical axis to an effective radius vertex of the sixth lens image-side surface satisfy: 1.5 < SAG62/SAG51 < 2.5.
According to one embodiment of the present application, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 1.5 < CT1/ET1 < 2.0.
According to one embodiment of the present application, a combined focal length f123 of the first lens, the second lens, and the third lens and an effective focal length f of the optical imaging lens satisfy: f123/f is more than 1.5 and less than 3.0.
According to one embodiment of the present application, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, and the on-axis distance TD from the object-side surface of the first lens to the image-side surface of the last lens satisfy: imgH/TD is more than 0.5 and less than 1.5.
According to an embodiment of the present application, an air interval T45 of the fourth lens and the fifth lens on the optical axis and an air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy: 3.7 < T56/T45 < 8.4.
According to one embodiment of the application, the distance SD from the stop to the image side surface of the last lens and the sum Σ AT of the air intervals on the optical axis between the first lens and any two adjacent lenses having optical powers in the lens closest to the imaging plane satisfy: 2.0 < SD/∑ AT < 3.1.
According to one embodiment of the present application, the absolute value of the optical distortion | OPD | satisfies: the < 1.5% of OPD.
The present invention further provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having an optical power; a second lens having a negative refractive power, the object-side surface of which is convex; a diaphragm; a third lens having optical power; a fourth lens having an optical power; a fifth lens having a positive optical power; a sixth lens having optical power; wherein an on-axis distance SAG31 between an intersection point of the third lens object-side surface and the optical axis and an effective radius vertex of the third lens object-side surface and an on-axis distance SAG21 between an intersection point of the second lens object-side surface and the optical axis and an effective radius vertex of the second lens object-side surface satisfy: 2.4 < SAG31/SAG21 < 6.8.
According to one embodiment of the present application, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: 1.0 < R3/R4 < 3.5.
According to one embodiment of the present application, the maximum field angle FOV of the optical imaging lens satisfies: FOV > 90.
According to one embodiment of the present application, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 2.5.
According to one embodiment of the present application, an on-axis distance TTL from an object-side surface of the first lens to the imaging surface and a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.6.
According to an embodiment of the present application, an on-axis distance SAG51 between an intersection of the fifth lens object-side surface and the optical axis to an effective radius vertex of the fifth lens object-side surface and an on-axis distance SAG62 between an intersection of the sixth lens image-side surface and the optical axis to an effective radius vertex of the sixth lens image-side surface satisfy: 1.5 < SAG62/SAG51 < 2.5.
According to one embodiment of the present application, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 1.5 < CT1/ET1 < 2.0.
According to one embodiment of the present application, a combined focal length f123 of the first lens, the second lens, and the third lens and an effective focal length f of the optical imaging lens satisfy: f123/f is more than 1.5 and less than 3.0.
According to one embodiment of the present application, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, and the on-axis distance TD from the object-side surface of the first lens to the image-side surface of the last lens satisfy: imgH/TD is more than 0.5 and less than 1.5.
According to an embodiment of the present application, an air interval T45 of the fourth lens and the fifth lens on the optical axis and an air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy: 3.7 < T56/T45 < 8.4.
According to one embodiment of the application, the distance SD from the stop to the image side surface of the last lens and the sum Σ AT of the air intervals on the optical axis between the first lens and any two adjacent lenses having optical powers in the lens closest to the imaging plane satisfy: 2.0 < SD/∑ AT < 3.1.
According to one embodiment of the present application, the absolute value of the optical distortion | OPD | satisfies: the < 1.5% of OPD.
The invention has the beneficial effects that:
the optical imaging lens provided by the invention comprises a plurality of lenses, such as a first lens to a sixth lens. The positive and negative distribution of the focal power of each component of the control system is reasonable, the low-order aberration of the control system can be effectively balanced, the tolerance sensitivity can be reduced by controlling the curvature radius ratio of the second lens, and the miniaturization of the system is maintained. By reasonably controlling the ratio, the inclination angles of the image side surface of the third lens and the image side surface of the second lens can be effectively controlled, and the ghost risk between the third lens and the second lens is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a lens assembly of an optical imaging lens system according to embodiment 1 of the present invention;
fig. 2a to 2d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, in an optical imaging lens according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a lens assembly according to embodiment 2 of the present invention;
fig. 4a to 4d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, according to an optical imaging lens of embodiment 2 of the present invention;
FIG. 5 is a schematic diagram of a lens assembly according to embodiment 3 of the present invention;
fig. 6a to 6d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to embodiment 3 of the present invention;
FIG. 7 is a schematic diagram of a lens assembly according to embodiment 4 of the present invention;
fig. 8a to 8d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, in an optical imaging lens according to embodiment 4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present invention.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
In the description of the present invention, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. Features, principles and other aspects of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Exemplary embodiments
The optical imaging lens according to an exemplary embodiment of the present invention includes six lenses, in order from an object side to an image side along an optical axis: the lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the lenses are independent from each other, and an air space is formed between the lenses on an optical axis.
In this exemplary embodiment, the image sensor, in order from an object side to an image side along an optical axis, comprises: the optical system comprises, in order from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having a negative refractive power, the object-side surface of which is convex; a diaphragm; a third lens having optical power; a fourth lens having an optical power; a fifth lens having a positive optical power; a sixth lens having optical power.
In the present exemplary embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: 1.0 < R3/R4 < 3.5. The positive and negative distribution of the focal power of each component of the control system is reasonable, the low-order aberration of the control system can be effectively balanced, the tolerance sensitivity can be reduced by controlling the curvature radius ratio of the second lens, and the miniaturization of the system is maintained. More specifically, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy: 1.20 < R3/R4 < 3.15.
In the present exemplary embodiment, an on-axis distance SAG31 between the intersection of the third lens object-side surface and the optical axis to the effective radius vertex of the third lens object-side surface and an on-axis distance SAG21 between the intersection of the second lens object-side surface and the optical axis to the effective radius vertex of the second lens object-side surface satisfy: 2.4 < SAG31/SAG21 < 6.8. By reasonably controlling the ratio, the inclination angles of the image side surface of the third lens and the image side surface of the second lens can be effectively controlled, and the ghost risk between the third lens and the second lens is reduced. More specifically, an on-axis distance SAG31 between the intersection of the third lens object-side surface and the optical axis to the effective radius vertex of the third lens object-side surface and an on-axis distance SAG21 between the intersection of the second lens object-side surface and the optical axis to the effective radius vertex of the second lens object-side surface satisfy: 2.40 < SAG31/SAG21 < 6.75.
In the present exemplary embodiment, the center thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 3.0 < CT4/ET4 < 3.5. The thickness ratio of the fourth lens can be controlled by controlling the ratio of the central thickness to the edge thickness of the fourth lens, the problem that the fourth lens is too thick or too thin in the design process is prevented, the processing feasibility of the fourth lens is ensured, and meanwhile, the difficulty in the aspects of forming stress, film coating and the like in the later period can be avoided. More specifically, the central thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 3.10 < CT4/ET4 < 3.30.
In the present exemplary embodiment, the maximum field angle FOV of the optical imaging lens satisfies: FOV > 90. By optimizing the optical system, the maximum field angle of the imaging lens is larger than 90 degrees, so that the characteristic of wide angle of the system is achieved. More specifically, the maximum field angle FOV of the optical imaging lens satisfies: FOV >95 °.
In the present exemplary embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 2.5. The F number of the imaging system is less than 2.5 through the distribution of the system power, and the characteristic of the large aperture of the system is completed. More specifically, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 2.10.
In the present exemplary embodiment, the on-axis distance TTL from the object-side surface of the first lens to the imaging plane and the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfy: TTL/ImgH is less than 1.6. The ultra-thin characteristic of the optical system is realized by restricting the ratio of the total length of the imaging system to the half image surface to be less than 1.6. More specifically, the on-axis distance TTL from the object-side surface of the first lens element to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH is less than 1.55.
In the present exemplary embodiment, an on-axis distance SAG51 between an intersection point of the fifth lens object-side surface and the optical axis to an effective radius vertex of the fifth lens object-side surface and an on-axis distance SAG62 between an intersection point of the sixth lens image-side surface and the optical axis to an effective radius vertex of the sixth lens image-side surface satisfy: 1.5 < SAG62/SAG51 < 2.5. By reasonably controlling the ratio, the inclination angles of the image side surface of the fifth lens and the image side surface of the sixth lens can be effectively controlled, and the ghost risk between the fifth lens and the sixth lens is reduced. More specifically, an on-axis distance SAG51 between an intersection of the fifth lens object-side surface and the optical axis and an effective radius vertex of the fifth lens object-side surface and an on-axis distance SAG62 between an intersection of the sixth lens image-side surface and the optical axis and an effective radius vertex of the sixth lens image-side surface satisfy: 1.52 < SAG62/SAG51 < 2.40.
In the present exemplary embodiment, the edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 1.5 < CT1/ET1 < 2.0. By controlling the ratio of the central thickness to the edge thickness of the first lens, the condition of uneven thickness of the lens in the design process is effectively prevented. More specifically, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 1.70 < CT1/ET1 < 1.95.
In the present exemplary embodiment, the combined focal length f123 of the first lens, the second lens, and the third lens and the effective focal length f of the optical imaging lens satisfy: f123/f is more than 1.5 and less than 3.0. By restricting the ratio of the combined focal length of the first lens, the second lens and the third lens to the effective focal length of the optical imaging lens within a certain range, the field curvature of the system can be reasonably controlled within a certain range. More specifically, the combined focal length f123 of the first lens, the second lens, and the third lens and the effective focal length f of the optical imaging lens satisfy: f123/f is more than 1.70 and less than 2.70.
In the present exemplary embodiment, ImgH, which is half the diagonal length of the effective pixel region on the imaging plane, and the on-axis distance TD from the object-side surface of the first lens to the image-side surface of the last lens satisfy: imgH/TD is more than 0.5 and less than 1.5. By restricting the ratio of the length of the half diagonal line of the effective pixel area on the imaging surface to the axial distance from the object side surface of the first lens to the image side surface of the last lens, the size of the view field is effectively controlled, and better imaging quality is obtained. More specifically, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, and the on-axis distance TD from the object-side surface of the first lens to the image-side surface of the last lens satisfy: imgH/TD is more than 0.85 and less than 1.20.
In the present exemplary embodiment, the air interval T45 of the fourth lens and the fifth lens on the optical axis and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy: 3.7 < T56/T45 < 8.4. By constraining the ratio of the fifth lens and fourth air space to the fourth lens and fifth lens air space, the field curvature contribution of each field of view can be controlled to a reasonable range. More specifically, an air interval T45 of the fourth lens and the fifth lens on the optical axis and an air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy: 3.75 < T56/T45 < 8.35.
In the present exemplary embodiment, the distance SD from the stop to the image side surface of the last lens and the sum Σ AT of the air intervals on the optical axis between the first lens and any adjacent two lenses having optical powers in the lens closest to the imaging plane satisfy: 2.0 < SD/∑ AT < 3.1. The distortion contribution of each visual field of the optical imaging lens is controlled within a reasonable range by controlling the ratio of the distance from the diaphragm to the image side surface of the last lens and the sum of the air intervals on the optical axis between the first lens and any two adjacent lenses with focal power in the lens closest to the imaging surface, and the imaging quality is improved. More specifically, the distance SD from the stop to the image side surface of the last lens and the sum Σ AT of the air intervals on the optical axis between the first lens and any adjacent two lenses having optical powers in the lens closest to the imaging surface satisfy: 2.45 < SD/∑ AT < 3.1.
In the present exemplary embodiment, the absolute value | OPD | of the optical distortion satisfies: the < 1.5% of OPD. The optical distortion of the imaging lens is controlled to be less than 1.5%, so that the lens has the characteristic of small distortion. More specifically, the absolute value | OPD | of the optical distortion satisfies: the < 1.5% of OPD.
In the present exemplary embodiment, the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 are aspheric, and the profile x of each aspheric lens can be defined using, but not limited to, the following aspheric formula:
Figure BDA0003228731790000061
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.
In the present exemplary embodiment, the above-described optical imaging lens may further include a diaphragm. The stop may be disposed at an appropriate position as needed, for example, the stop may be disposed between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.
The optical imaging lens according to the above embodiment of the present invention may employ a plurality of lenses, for example, the above six lenses. The optical imaging lens has the characteristics of large imaging image surface, wide imaging range and high imaging quality by reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, and the ultrathin property of the mobile phone is ensured.
In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the sixth lens is an aspheric mirror surface. The aspheric lens is characterized in that: the aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and astigmatic aberration, unlike a spherical lens having a constant curvature from the lens center to the lens periphery, in which the curvature is continuously varied from the lens center to the lens periphery. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspheric mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although seven lenses are exemplified in the embodiment, the optical imaging lens is not limited to include seven lenses, and may include other numbers of lenses if necessary.
Specific embodiments of an optical imaging lens suitable for the above-described embodiments are further described below with reference to the drawings.
Detailed description of the preferred embodiment 1
Fig. 1 is a schematic view of a lens assembly according to embodiment 1 of the present disclosure, wherein the optical imaging lens includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging plane S15.
As shown in table 1, a basic parameter table of the optical imaging lens of embodiment 1 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).
Figure BDA0003228731790000071
Figure BDA0003228731790000081
TABLE 1
As shown in table 2, in embodiment 1, the total effective focal length f of the optical imaging lens is 3.38mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S15 is 5.11mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S15 is 3.71 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 47.8 °. The on-axis distance SAG51 between the intersection of the fifth lens object-side surface and the optical axis to the effective radius vertex of the fifth lens object-side surface is-0.06. And the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens is-0.09. The edge thickness ET4 of the fourth lens is 0.25.
Figure BDA0003228731790000082
TABLE 2
The optical imaging lens in embodiment 1 satisfies:
R3/R4 ═ 1.23; wherein R3 is the curvature radius of the object-side surface of the second lens, and R4 is the curvature radius of the image-side surface of the second lens.
SAG31/SAG21 is 3.43; SAG31 is an on-axis distance from an intersection point of the object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, and SAG21 is an on-axis distance from an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens.
CT4/ET 4-3.11; where CT4 is the central thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens.
FOV 95.6 °; wherein, the FOV is the maximum field angle of the optical imaging lens.
f/EPD is 2.05; wherein f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.
TTL/ImgH is 1.38; wherein, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.
SAG62/SAG51 is 1.55; SAG51 is an on-axis distance between an intersection point of the fifth lens object-side surface and the optical axis and an effective radius vertex of the fifth lens object-side surface, and SAG62 is an on-axis distance between an intersection point of the sixth lens image-side surface and the optical axis and an effective radius vertex of the sixth lens image-side surface.
CT1/ET1 is 1.91; where ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.
f123/f is 2.10; wherein f123 is a combined focal length of the first lens, the second lens and the third lens, and f is an effective focal length of the optical imaging lens.
ImgH/TD is 1.13; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, and TD is the on-axis distance from the object-side surface of the first lens to the image-side surface of the last lens.
T56/T45 ═ 8.31; where T45 is an air space on the optical axis of the fourth lens and the fifth lens, and T56 is an air space on the optical axis of the fifth lens and the sixth lens.
SD/AT 2.49; wherein SD is the distance from the diaphragm to the image side surface of the last lens, and Sigma AT is the sum of the air intervals on the optical axis between the first lens and any two adjacent lenses with focal power in the lens closest to the imaging surface.
In example 1, the object-side surface and the image-side surface of any one of the first lens element E1 through the sixth lens element E6 are aspheric, and table 3 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S12 in example 14、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 -8.1154E-02 -5.9174E-03 3.4983E-03 3.1869E-03 7.6452E-04 -2.7309E-04 -8.6170E-04
S2 -6.6825E-02 1.1858E-02 -2.2988E-03 7.9437E-04 -1.5960E-05 5.8075E-06 -2.6857E-06
S3 -5.7843E-02 1.2137E-02 -2.3913E-03 6.2767E-04 -6.2881E-05 -2.0829E-05 -8.3646E-06
S4 -3.0532E-02 1.4677E-03 -4.7259E-04 7.9906E-05 -3.9316E-06 -8.1159E-06 -4.4937E-07
S5 -1.5761E-01 -8.5059E-03 1.2680E-04 8.4743E-04 2.6781E-04 8.8237E-05 -6.6245E-05
S6 -2.3525E-01 6.9002E-03 -1.5879E-03 9.1701E-04 3.5756E-05 1.0033E-03 -9.6288E-05
S7 -1.4139E-02 7.9327E-02 -1.8166E-02 -3.2842E-04 -1.1739E-03 2.5789E-03 -1.4205E-03
S8 -3.2290E-01 1.6183E-01 3.9096E-02 -1.8418E-02 -6.0221E-03 -3.6588E-03 3.8363E-03
S9 2.8428E-01 -4.1072E-01 2.5500E-01 -7.9770E-02 2.4596E-02 -1.5900E-02 5.4912E-03
S10 1.5367E+00 -7.3909E-01 3.5539E-01 -1.3700E-01 5.2033E-02 -1.9643E-02 2.8722E-03
S11 -2.8696E+00 4.8784E-01 -1.2808E-01 1.2496E-02 5.0586E-03 4.1602E-04 -9.3256E-05
S12 -6.0331E+00 1.2463E+00 -4.2236E-01 1.4379E-01 -4.7315E-02 2.3101E-02 -1.2187E-02
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 -8.3249E-04 -7.2016E-04 -4.3813E-04 -2.3087E-04 -5.8081E-05 -1.8938E-06 1.6041E-05
S2 -6.9384E-06 -3.6989E-06 -4.0948E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 -6.8589E-06 -1.6372E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S4 -4.4188E-06 2.5464E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S5 -1.4156E-05 -2.7079E-05 -1.0230E-05 -1.0077E-05 -3.6477E-06 0.0000E+00 0.0000E+00
S6 1.4701E-05 -8.3059E-05 1.2159E-05 -7.2262E-06 1.5068E-06 0.0000E+00 0.0000E+00
S7 1.9371E-06 1.9186E-04 1.5465E-05 -8.3273E-05 3.6442E-06 4.2753E-05 -1.7907E-05
S8 8.4490E-04 -2.0889E-04 -5.7415E-04 -1.0109E-04 8.9747E-05 6.6120E-05 -2.2257E-05
S9 -1.0011E-03 1.6199E-03 -1.1632E-03 3.8564E-04 -1.4742E-04 4.7460E-05 0.0000E+00
S10 8.9989E-04 -7.1564E-04 7.5011E-04 -5.6489E-04 1.1658E-04 3.1876E-05 0.0000E+00
S11 -1.0005E-03 1.6817E-03 -1.0933E-03 2.2918E-04 2.7604E-04 1.2048E-04 -1.4347E-04
S12 6.7291E-03 -3.2226E-03 3.8595E-04 2.0823E-05 5.4431E-04 -1.6109E-05 4.2807E-05
TABLE 3
Fig. 2a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2c shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 2a to 2d, the optical imaging lens according to embodiment 1 can achieve good imaging quality.
Specific example 2
Fig. 3 is a schematic view of a lens assembly according to embodiment 2 of the present invention, the optical imaging lens, in order from an object side to an image side along an optical axis, includes: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging plane S15.
As shown in table 4, the basic parameter table of the optical imaging lens of embodiment 2 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).
Figure BDA0003228731790000101
Figure BDA0003228731790000111
TABLE 4
As shown in table 5, in embodiment 2, the total effective focal length f of the optical imaging lens is 3.21mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S15 is 5.12mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S15 is 3.41 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 47.8 °. And the on-axis distance SAG51 between the intersection point of the object-side surface of the fifth lens and the optical axis and the effective radius vertex of the object-side surface of the fifth lens is equal to 0.25. And the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens is 0.40. The edge thickness ET4 of the fourth lens is 0.25.
Figure BDA0003228731790000112
TABLE 5
The optical imaging lens in embodiment 2 satisfies:
R3/R4 ═ 1.63; wherein R3 is the curvature radius of the object-side surface of the second lens, and R4 is the curvature radius of the image-side surface of the second lens.
SAG31/SAG21 is 6.41; SAG31 is an on-axis distance from an intersection point of the object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, and SAG21 is an on-axis distance from an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens.
CT4/ET 4-3.28; where CT4 is the central thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens.
FOV 95.6 °; wherein, the FOV is the maximum field angle of the optical imaging lens.
f/EPD is 2.05; wherein f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.
TTL/ImgH is 1.50; wherein, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.
SAG62/SAG51 is 1.58; SAG51 is an on-axis distance between an intersection point of the fifth lens object-side surface and the optical axis and an effective radius vertex of the fifth lens object-side surface, and SAG62 is an on-axis distance between an intersection point of the sixth lens image-side surface and the optical axis and an effective radius vertex of the sixth lens image-side surface.
CT1/ET1 ═ 1.80; where ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.
f123/f 2.44; wherein f123 is a combined focal length of the first lens, the second lens and the third lens, and f is an effective focal length of the optical imaging lens.
ImgH/TD is 0.89; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, and TD is the on-axis distance from the object-side surface of the first lens to the image-side surface of the last lens.
T56/T45 ═ 5.61; where T45 is an air space on the optical axis of the fourth lens and the fifth lens, and T56 is an air space on the optical axis of the fifth lens and the sixth lens.
SD/AT 3.09; wherein SD is the distance from the diaphragm to the image side surface of the last lens, and Sigma AT is the sum of the air intervals on the optical axis between the first lens and any two adjacent lenses with focal power in the lens closest to the imaging surface.
In example 2, the object-side surface and the image-side surface of any one of the first lens element E1 through the sixth lens element E6 are aspheric, and table 6 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S12 in example 24、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 -5.5120E-02 -5.6955E-03 -3.9091E-04 3.3738E-04 9.5612E-06 4.1231E-05 -2.6588E-05
S2 -6.8231E-02 8.4657E-03 -1.3602E-03 5.1834E-04 -6.9456E-05 -1.1070E-05 -2.2670E-05
S3 -5.8680E-02 1.0612E-02 -2.5014E-03 9.3429E-04 -3.4942E-05 -3.1875E-05 -5.8449E-05
S4 -2.7776E-02 3.8676E-04 -4.2917E-04 8.7913E-05 4.0273E-05 1.7599E-05 1.6572E-05
S5 -1.8234E-01 -1.3859E-02 -2.5286E-04 1.5607E-03 7.7366E-04 1.7806E-04 -1.0592E-04
S6 -2.3310E-01 9.4920E-03 -2.2734E-03 1.4585E-03 1.1438E-03 6.5357E-04 -3.6651E-04
S7 -3.7026E-03 7.7360E-02 -1.6520E-02 -9.8469E-04 4.6542E-04 1.3448E-03 -1.1443E-03
S8 -3.2739E-01 1.6311E-01 3.8491E-02 -1.7172E-02 -4.8480E-03 -3.8532E-03 3.2644E-03
S9 2.6604E-01 -3.8400E-01 2.8091E-01 -1.0355E-01 2.6077E-02 -1.8880E-02 1.0823E-02
S10 1.6520E+00 -7.3985E-01 3.6041E-01 -1.3348E-01 5.0212E-02 -1.9019E-02 2.3292E-03
S11 -2.8052E+00 5.1105E-01 -1.4772E-01 4.2378E-03 2.8752E-03 -1.7040E-03 -2.6021E-04
S12 -5.9585E+00 1.2696E+00 -4.3382E-01 1.4476E-01 -5.2080E-02 2.3170E-02 -1.1872E-02
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 1.4011E-05 -1.1419E-05 1.1283E-05 -4.1388E-06 1.7706E-06 -4.7841E-06 2.4049E-06
S2 -2.2089E-05 -1.9147E-05 -1.1286E-05 -1.3896E-06 5.8473E-06 8.5899E-06 4.0566E-06
S3 -2.5471E-05 8.7633E-06 1.2462E-05 3.0784E-06 9.6388E-07 0.0000E+00 0.0000E+00
S4 -7.4834E-07 -6.3354E-07 -7.2764E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S5 -8.0795E-05 -7.5544E-05 -3.5871E-05 -1.7647E-05 -1.7789E-07 0.0000E+00 0.0000E+00
S6 -1.3510E-04 -1.9181E-04 -9.3309E-05 -5.1616E-05 -1.3568E-05 0.0000E+00 0.0000E+00
S7 4.4271E-04 -4.8552E-05 -6.0969E-05 -1.7807E-05 2.4087E-05 -1.2744E-05 3.7885E-06
S8 7.7231E-04 7.4983E-05 -4.0659E-04 -1.8333E-04 2.0769E-07 5.0739E-05 6.2908E-06
S9 -1.5516E-03 8.0876E-04 -1.7880E-03 8.5546E-04 -2.5751E-04 2.0760E-04 -7.6777E-05
S10 6.4734E-04 -6.5699E-04 8.4523E-04 -5.1968E-04 1.9187E-04 5.7002E-05 -4.8941E-05
S11 -4.4528E-04 1.9057E-03 -1.4573E-03 2.2894E-04 3.6648E-04 2.0904E-04 -1.7751E-04
S12 6.8796E-03 -3.3129E-03 1.1423E-04 -8.8912E-05 5.2562E-04 -1.4869E-04 -7.8437E-06
TABLE 6
Fig. 4a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4c shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 4a to 4d, the optical imaging lens according to embodiment 2 can achieve good imaging quality.
Specific example 3
Fig. 5 is a lens assembly according to embodiment 3 of the present invention, which, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging plane S15.
As shown in table 7, the basic parameter table of the optical imaging lens of embodiment 3 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Figure BDA0003228731790000131
TABLE 7
As shown in table 8, in embodiment 3, the total effective focal length f of the optical imaging lens is 3.25mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S15 is 5.11mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S15 is 3.45 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 47.8 °. And the on-axis distance SAG51 between the intersection point of the fifth lens object-side surface and the optical axis and the effective radius vertex of the fifth lens object-side surface is 0.26. And the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens is 0.48. The edge thickness ET4 of the fourth lens is 0.25.
Figure BDA0003228731790000141
TABLE 8
The optical imaging lens in embodiment 3 satisfies:
R3/R4 ═ 2.19; wherein R3 is the curvature radius of the object-side surface of the second lens, and R4 is the curvature radius of the image-side surface of the second lens.
SAG31/SAG21 is 6.74; SAG31 is an on-axis distance from an intersection point of the object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, and SAG21 is an on-axis distance from an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens.
CT4/ET 4-3.27; where CT4 is the central thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens.
FOV 95.6 °; wherein, the FOV is the maximum field angle of the optical imaging lens.
f/EPD is 2.05; wherein f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.
TTL/ImgH is 1.48; wherein, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.
SAG62/SAG51 is 1.85; SAG51 is an on-axis distance between an intersection point of the fifth lens object-side surface and the optical axis and an effective radius vertex of the fifth lens object-side surface, and SAG62 is an on-axis distance between an intersection point of the sixth lens image-side surface and the optical axis and an effective radius vertex of the sixth lens image-side surface.
CT1/ET1 is 1.78; where ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.
f123/f 2.44; wherein f123 is a combined focal length of the first lens, the second lens and the third lens, and f is an effective focal length of the optical imaging lens.
ImgH/TD is 0.91; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, and TD is the on-axis distance from the object-side surface of the first lens to the image-side surface of the last lens.
T56/T45 ═ 5.49; where T45 is an air space on the optical axis of the fourth lens and the fifth lens, and T56 is an air space on the optical axis of the fifth lens and the sixth lens.
SD/AT 2.91; wherein SD is the distance from the diaphragm to the image side surface of the last lens, and Sigma AT is the sum of the air intervals on the optical axis between the first lens and any two adjacent lenses with focal power in the lens closest to the imaging surface.
In example 3, the object-side surface and the image-side surface of any one of the first lens element E1 through the sixth lens element E6 are aspheric, and table 9 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S12 in example 34、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 -5.9109E-02 -5.6124E-03 6.9718E-05 4.1642E-04 -2.3609E-05 2.4031E-05 -3.6643E-05
S2 -6.3854E-02 9.0087E-03 -1.7371E-03 4.0860E-04 -8.9309E-05 -1.6084E-05 2.9902E-06
S3 -4.4104E-02 6.4312E-03 -2.4948E-03 3.2656E-04 8.7932E-05 1.3813E-04 1.2980E-04
S4 -2.6858E-02 -7.5522E-04 -5.0779E-04 -5.3733E-05 -1.8170E-05 -5.3244E-05 -2.0797E-05
S5 -1.6817E-01 -1.7966E-02 -1.8940E-03 5.9295E-04 6.1007E-04 2.9233E-04 1.1021E-04
S6 -1.7854E-01 9.8196E-03 6.9764E-06 6.6746E-04 5.8711E-04 -2.1308E-04 -4.9337E-04
S7 2.5587E-03 7.6382E-02 -1.7603E-02 -8.5522E-04 1.0469E-03 5.8108E-04 -8.4049E-04
S8 -3.0852E-01 1.4562E-01 4.2155E-02 -1.5141E-02 -2.4765E-03 -5.1989E-03 2.8698E-03
S9 2.3216E-01 -3.8650E-01 2.9584E-01 -1.1612E-01 2.7649E-02 -1.5747E-02 1.3492E-02
S10 1.8115E+00 -7.6468E-01 3.9964E-01 -1.4811E-01 5.3788E-02 -2.3620E-02 3.7945E-03
S11 -2.8368E+00 5.1115E-01 -1.5829E-01 2.6083E-02 8.2757E-03 -6.5631E-03 -1.3178E-03
S12 -6.6031E+00 1.3947E+00 -5.0107E-01 1.9263E-01 -7.0279E-02 2.7086E-02 -1.3881E-02
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 1.0942E-05 -1.2194E-05 8.9639E-06 -3.8362E-06 1.7564E-06 -4.4949E-06 2.6457E-06
S2 1.1293E-06 6.4223E-06 8.2545E-07 -3.8264E-06 -2.5193E-06 -8.6128E-07 1.3300E-06
S3 8.2610E-05 5.1792E-05 1.6456E-05 -6.9575E-06 -2.0045E-05 -1.9863E-05 -7.3050E-06
S4 -3.6423E-05 -1.9059E-05 -2.5781E-05 -1.4069E-05 -1.5761E-05 -6.2242E-06 -4.6934E-06
S5 9.2307E-05 6.3947E-05 4.1570E-05 1.8528E-05 7.7146E-06 0.0000E+00 0.0000E+00
S6 -1.4719E-04 -7.6052E-05 -2.1906E-05 1.1713E-06 5.2670E-06 0.0000E+00 0.0000E+00
S7 3.2456E-04 -3.5360E-05 -4.9439E-05 -8.8847E-06 2.1085E-05 -1.3842E-05 5.6266E-06
S8 4.0157E-04 2.2833E-04 -3.4382E-04 -1.8916E-04 -7.1297E-07 3.4518E-05 2.6195E-05
S9 -3.5607E-03 6.9227E-04 -1.8878E-03 1.1046E-03 -3.9088E-04 3.9057E-04 -1.7600E-04
S10 1.8880E-03 -5.1756E-04 6.8938E-04 -8.8410E-04 2.9362E-04 1.1474E-04 -7.1491E-05
S11 -5.0497E-04 -5.6902E-04 -1.3630E-03 1.1880E-03 2.1426E-04 2.4797E-04 -4.5594E-05
S12 7.2734E-03 -5.0638E-03 2.7417E-03 -9.3429E-04 1.6510E-05 -1.0513E-04 2.1469E-04
TABLE 9
Fig. 6a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6c shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 6a to 6d, the optical imaging lens according to embodiment 3 can achieve good imaging quality.
Specific example 4
Fig. 7 is a lens assembly structure of the optical imaging lens system according to embodiment 4 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging plane S15.
As shown in table 10, the basic parameter table of the optical imaging lens of embodiment 4 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Figure BDA0003228731790000161
Watch 10
As shown in table 11, in embodiment 4, the total effective focal length f of the optical imaging lens is 3.23mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S15 is 5.07mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S15 is 3.43 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 47.8 °. And the on-axis distance SAG51 between the intersection point of the object-side surface of the fifth lens and the optical axis and the effective radius vertex of the object-side surface of the fifth lens is 0.06. And the on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens is 0.13. The edge thickness ET4 of the fourth lens is 0.26.
Figure BDA0003228731790000171
TABLE 11
The optical imaging lens in embodiment 4 satisfies:
R3/R4 ═ 3.11; wherein R3 is the curvature radius of the object-side surface of the second lens, and R4 is the curvature radius of the image-side surface of the second lens.
SAG31/SAG21 is 2.45; SAG31 is an on-axis distance from an intersection point of the object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, and SAG21 is an on-axis distance from an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens.
CT4/ET 4-3.15; where CT4 is the central thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens.
FOV 95.6 °; wherein, the FOV is the maximum field angle of the optical imaging lens.
f/EPD is 2.05; wherein f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging lens.
TTL/ImgH is 1.48; wherein, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.
SAG62/SAG51 is 2.35; SAG51 is an on-axis distance between an intersection point of the fifth lens object-side surface and the optical axis and an effective radius vertex of the fifth lens object-side surface, and SAG62 is an on-axis distance between an intersection point of the sixth lens image-side surface and the optical axis and an effective radius vertex of the sixth lens image-side surface.
CT1/ET1 ═ 1.72; where ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.
f123/f is 2.69; wherein f123 is a combined focal length of the first lens, the second lens and the third lens, and f is an effective focal length of the optical imaging lens.
ImgH/TD is 0.89; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane, and TD is the on-axis distance from the object-side surface of the first lens to the image-side surface of the last lens.
T56/T45 ═ 3.76; where T45 is an air space on the optical axis of the fourth lens and the fifth lens, and T56 is an air space on the optical axis of the fifth lens and the sixth lens.
SD/AT 2.98; wherein SD is the distance from the diaphragm to the image side surface of the last lens, and Sigma AT is the sum of the air intervals on the optical axis between the first lens and any two adjacent lenses with focal power in the lens closest to the imaging surface.
In example 4, the object-side surface and the image-side surface of any one of the first lens element E1 through the sixth lens element E6 are aspheric, and table 12 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S12 in example 44、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 -5.0308E-02 -5.1879E-03 -5.9366E-04 1.6187E-04 -2.8585E-05 2.4363E-05 -3.1365E-05
S2 -6.0139E-02 9.2006E-03 -2.5823E-03 6.0046E-04 -1.3347E-04 -6.2092E-06 -1.5884E-06
S3 -4.8383E-02 9.4022E-03 -2.3307E-03 4.2447E-04 -7.8069E-05 -1.6531E-05 1.1601E-05
S4 -2.7512E-02 1.4305E-03 -3.2741E-04 -4.8991E-06 4.3812E-05 -3.0562E-05 2.6252E-05
S5 -1.5178E-01 -5.2542E-03 -1.2353E-04 7.2073E-04 2.1573E-04 7.3613E-05 -3.0930E-05
S6 -2.3625E-01 7.3350E-03 -4.3272E-03 1.7336E-03 8.7796E-05 5.4913E-04 -1.1069E-04
S7 -2.3526E-02 8.2447E-02 -1.9259E-02 2.2444E-03 -1.7022E-03 1.5792E-03 -8.3729E-04
S8 -3.1965E-01 1.9081E-01 3.3314E-02 -2.3843E-02 -4.0139E-03 -2.9685E-03 4.3071E-03
S9 2.7566E-01 -3.9142E-01 2.9291E-01 -1.1048E-01 2.6357E-02 -1.7496E-02 1.0483E-02
S10 1.6296E+00 -7.7757E-01 3.7816E-01 -1.6120E-01 5.6114E-02 -2.4085E-02 3.7234E-03
S11 -2.9980E+00 5.4134E-01 -1.7083E-01 8.8501E-03 1.4536E-03 -1.5828E-03 6.2628E-04
S12 -6.5615E+00 1.3671E+00 -4.9079E-01 1.6188E-01 -5.9878E-02 2.6429E-02 -1.4240E-02
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 8.2461E-06 -9.5358E-06 6.1455E-06 -4.2312E-06 -1.2303E-06 -2.9836E-06 3.6752E-06
S2 3.4894E-06 4.1405E-06 2.8661E-06 -5.7663E-06 -1.8455E-06 -3.3569E-06 2.5190E-06
S3 2.0115E-06 9.1284E-06 9.8529E-06 9.9148E-06 6.3708E-06 -2.6460E-06 -1.8037E-06
S4 -8.8972E-06 1.6807E-05 -3.7154E-06 7.8629E-06 -2.4032E-06 6.3509E-06 -1.6188E-06
S5 -6.7210E-06 -1.5388E-05 -3.9487E-06 -9.7166E-07 1.4338E-06 0.0000E+00 0.0000E+00
S6 5.8706E-05 -4.9305E-05 5.1527E-06 -9.0583E-06 4.1798E-06 0.0000E+00 0.0000E+00
S7 2.5409E-04 -6.8988E-05 1.0352E-06 -2.4528E-05 1.4471E-05 -9.8581E-07 3.0228E-07
S8 3.3669E-04 -3.6477E-04 -4.6788E-04 -4.7332E-05 1.2395E-04 2.4594E-05 -1.7511E-05
S9 -1.8768E-03 1.1698E-03 -1.8786E-03 8.8928E-04 -2.2141E-04 1.3140E-04 -5.6507E-05
S10 1.5078E-03 -4.3398E-04 1.0594E-03 -6.9008E-04 4.1077E-04 5.2286E-05 -1.0527E-04
S11 7.7964E-04 2.4987E-03 -7.1502E-04 7.4537E-04 5.8475E-04 -1.4467E-04 -3.6392E-04
S12 7.7687E-03 -4.1053E-03 1.8629E-03 1.0418E-03 6.6231E-04 -6.5044E-04 9.9145E-05
TABLE 12
Fig. 8a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8c shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 8a to 8d, the optical imaging lens according to embodiment 4 can achieve good imaging quality.
The present invention is not limited to the above preferred embodiments, and any modifications, improvements, equivalents, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An optical imaging lens, in order from an object side to an image side along an optical axis, comprising:
a first lens having an optical power;
a second lens having a negative refractive power, the object-side surface of which is convex;
a diaphragm;
a third lens having optical power;
a fourth lens having an optical power;
a fifth lens having a positive optical power;
a sixth lens having optical power;
wherein a radius of curvature R3 of the second lens object side surface and a radius of curvature R4 of the second lens image side surface satisfy: 1.0 < R3/R4 < 3.5.
2. The optical imaging lens of claim 1, wherein an on-axis distance SAG31 from the intersection of the third lens object-side surface and the optical axis to the effective radius vertex of the third lens object-side surface and an on-axis distance SAG21 from the intersection of the second lens object-side surface and the optical axis to the effective radius vertex of the second lens object-side surface satisfy: 2.4 < SAG31/SAG21 < 6.8.
3. The optical imaging lens of claim 1, wherein the maximum field angle FOV of the optical imaging lens satisfies: FOV > 90.
4. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 2.5.
5. The optical imaging lens of claim 1, wherein the on-axis distance TTL from the object-side surface of the first lens element to the imaging plane satisfies, with ImgH, half the diagonal length of the effective pixel area on the imaging plane: TTL/ImgH is less than 1.6.
6. An optical imaging lens, in order from an object side to an image side along an optical axis, comprising:
a first lens having an optical power;
a second lens having a negative refractive power, the object-side surface of which is convex;
a diaphragm;
a third lens having optical power;
a fourth lens having an optical power;
a fifth lens having a positive optical power;
a sixth lens having optical power;
wherein an on-axis distance SAG31 between an intersection point of the third lens object-side surface and the optical axis and an effective radius vertex of the third lens object-side surface and an on-axis distance SAG21 between an intersection point of the second lens object-side surface and the optical axis and an effective radius vertex of the second lens object-side surface satisfy: 2.4 < SAG31/SAG21 < 6.8.
7. The optical imaging lens of claim 13, wherein ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, and the on-axis distance TD from the object side of the first lens to the image side of the last lens satisfy: imgH/TD is more than 0.5 and less than 1.5.
8. An optical imaging lens as claimed in claim 13, wherein an air interval T45 between the fourth lens and the fifth lens on the optical axis and an air interval T56 between the fifth lens and the sixth lens on the optical axis satisfy: 3.7 < T56/T45 < 8.4.
9. The optical imaging lens according to claim 13, wherein a distance SD from the stop to the image side surface of the last lens and a sum Σ AT of an air interval on the optical axis between the first lens and any two adjacent lenses having optical powers in the lens closest to the imaging surface satisfy: 2.0 < SD/∑ AT < 3.1.
10. The optical imaging lens according to claim 13, characterized in that an absolute value | OPD | of optical distortion satisfies: the < 1.5% of OPD.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114967068A (en) * 2022-07-28 2022-08-30 浙江华诺康科技有限公司 Imaging system and optical lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114967068A (en) * 2022-07-28 2022-08-30 浙江华诺康科技有限公司 Imaging system and optical lens

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