CN114706193A - Optical imaging lens - Google Patents

Optical imaging lens Download PDF

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Publication number
CN114706193A
CN114706193A CN202210356912.7A CN202210356912A CN114706193A CN 114706193 A CN114706193 A CN 114706193A CN 202210356912 A CN202210356912 A CN 202210356912A CN 114706193 A CN114706193 A CN 114706193A
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China
Prior art keywords
lens
optical imaging
imaging lens
optical
focal length
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Granted
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CN202210356912.7A
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Chinese (zh)
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CN114706193B (en
Inventor
李建林
邢天祥
黄林
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 CN202210356912.7A priority Critical patent/CN114706193B/en
Publication of CN114706193A publication Critical patent/CN114706193A/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
    • G02B13/004—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 four lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

Abstract

The application discloses an optical imaging lens, which sequentially comprises from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having a positive optical power; a third lens having a negative optical power; and a fourth lens having optical power. The entrance pupil diameter EPD of the optical imaging lens and the total effective focal length f of the optical imaging lens meet the following conditions: f/EPD > 4.

Description

Optical imaging lens
Technical Field
The application relates to the field of optical elements, in particular to an optical imaging lens.
Background
In recent years, portable electronic products such as smart phones are developed rapidly, users have higher and higher requirements for functions of smart phones and the like, especially for photographing functions of the smart phones, and conventional lenses cannot meet the requirements of the users. In order to make the optical imaging lens mounted on the smart phone gradually trend toward high definition, high imaging quality and the like, the telephoto lens is favored by many lens manufacturers. However, the conventional telephoto lens has a long total length, which will seriously limit the development of miniaturization of the optical imaging lens, and further hinder the development of miniaturization of the smart phone.
Disclosure of Invention
An aspect of the present disclosure provides 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 positive optical power; a third lens having a negative optical power; and a fourth lens having optical power. The entrance pupil diameter EPD of the optical imaging lens and the total effective focal length f of the optical imaging lens can satisfy the following conditions: f/EPD > 4.
In one embodiment, the optical imaging lens may satisfy: T34/(T12+ T23) ≧ 1.89, where T12 is the air space on the optical axis of the first lens and the second lens, T23 is the air space on the optical axis of the second lens and the third lens, and T34 is the air space on the optical axis of the third lens and the fourth lens.
In one embodiment, the optical imaging lens may satisfy: 0 < f12/f < 1, where f12 is the combined focal length of the first and second lenses and f is the total effective focal length of the optical imaging lens.
In one embodiment, the optical imaging lens may satisfy: 0.88 ≦ CT2/CT3 < 3, wherein CT3 is a central thickness of the third lens on the optical axis, and CT2 is a central thickness of the second lens on the optical axis.
In one embodiment, the optical imaging lens may satisfy: 1.6 < f1/EPD < 4, where EPD is the entrance pupil diameter of the optical imaging lens and f1 is the effective focal length of the first lens.
In one embodiment, the optical imaging lens may satisfy: 0 < (R1+ R3+ R6)/(f1+ f2+ f3) < 1.2, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, R1 is the radius of curvature of the object-side surface of the first lens, R3 is the radius of curvature of the object-side surface of the second lens, and R6 is the radius of curvature of the image-side surface of the third lens.
In one embodiment, the optical imaging lens may satisfy: -3 < f3/R6 < -0.5, wherein f3 is the effective focal length of the third lens and R6 is the radius of curvature of the image-side surface of the third lens.
In one embodiment, the optical imaging lens may satisfy: DT31/DT21 < 1, where DT21 is the effective radius of the object side of the second lens and DT31 is the effective radius of the object side of the third lens.
In one embodiment, the optical imaging lens may satisfy: ET3/CT3 is ETn/CTn, wherein ET3 is the edge thickness of the third lens, CT3 is the center thickness of the third lens on the optical axis, ETn is the edge thickness of any one of the first lens, the second lens and the fourth lens, and CTn is the center thickness of any one of the first lens, the second lens and the fourth lens on the optical axis.
In one embodiment, the optical imaging lens may satisfy: 1.4 < (N1+ N2+ N3+ N4)/4 < 1.8, wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, and N4 is the refractive index of the fourth lens.
In one embodiment, the optical imaging lens may satisfy: TTL/f < 1, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens.
In one embodiment, the optical imaging lens includes a diaphragm between the first lens and the second lens, and the optical imaging lens may satisfy: and 0.8 < SL/TTL < 1, wherein SL is the distance between the diaphragm and the imaging surface of the optical imaging lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis.
In one embodiment, the optical imaging lens may satisfy: tan (Semi-FOV). times.f > 3mm, wherein the Semi-FOV is half of the maximum field angle of the optical imaging lens, and f is the total effective focal length of the optical imaging lens.
In one embodiment, the optical imaging lens may satisfy: and 0.2 & lt BFL/f & lt 0.8, wherein BFL is the distance from the image side surface of the fourth lens to the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens.
In one embodiment, the optical imaging lens further includes a prism between the object side and the first lens, the prism reflecting light incident to the prism in an incident direction to exit from the prism in an optical axis direction.
Another aspect of the present application provides an optical imaging lens. The optical imaging lens sequentially comprises from an object side to an image side along an optical axis: a first lens having a positive refractive power, an object-side surface of which is convex; the second lens with positive focal power has a convex object-side surface and a concave image-side surface; a third lens with negative focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the fourth lens with positive focal power has a convex object-side surface and a concave image-side surface; the total effective focal length f of the optical imaging lens can satisfy the following conditions: f is more than 13 mm.
In one embodiment, the optical imaging lens may satisfy: T34/(T12+ T23) ≧ 1.89, where T12 is the air space on the optical axis of the first lens and the second lens, T23 is the air space on the optical axis of the second lens and the third lens, and T34 is the air space on the optical axis of the third lens and the fourth lens.
In one embodiment, the optical imaging lens may satisfy: 0 < f12/f < 1, where f12 is the combined focal length of the first and second lenses and f is the total effective focal length of the optical imaging lens.
In one embodiment, the optical imaging lens may satisfy: 0.88 ≦ CT2/CT3 < 3, where CT3 is the central thickness of the third lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis.
In one embodiment, the optical imaging lens may satisfy: 1.6 < f1/EPD < 4, where EPD is the entrance pupil diameter of the optical imaging lens and f1 is the effective focal length of the first lens.
In one embodiment, the optical imaging lens may satisfy: 0 < (R1+ R3+ R6)/(f1+ f2+ f3) < 1.2, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, R1 is the radius of curvature of the object-side surface of the first lens, R3 is the radius of curvature of the object-side surface of the second lens, and R6 is the radius of curvature of the image-side surface of the third lens.
In one embodiment, the optical imaging lens may satisfy: -3 < f3/R6 < -0.5, wherein f3 is the effective focal length of the third lens and R6 is the radius of curvature of the image-side surface of the third lens.
In one embodiment, the optical imaging lens may satisfy: DT31/DT21 < 1, where DT21 is the effective radius of the object side of the second lens and DT31 is the effective radius of the object side of the third lens.
In one embodiment, the optical imaging lens may satisfy: ET3/CT3 is ETn/CTn, wherein ET3 is the edge thickness of the third lens, CT3 is the center thickness of the third lens on the optical axis, ETn is the edge thickness of any one of the first lens, the second lens and the fourth lens, and CTn is the center thickness of any one of the first lens, the second lens and the fourth lens on the optical axis.
In one embodiment, the optical imaging lens may satisfy: 1.4 < (N1+ N2+ N3+ N4)/4 < 1.8, wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, and N4 is the refractive index of the fourth lens.
In one embodiment, the optical imaging lens may satisfy: TTL/f < 1, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens.
In one embodiment, the optical imaging lens includes a diaphragm between the first lens and the second lens, and the optical imaging lens may satisfy: and 0.8 < SL/TTL < 1, wherein SL is the distance between the diaphragm and the imaging surface of the optical imaging lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis.
In one embodiment, the optical imaging lens may satisfy: tan (Semi-FOV). times.f > 3mm, wherein the Semi-FOV is half of the maximum field angle of the optical imaging lens, and f is the total effective focal length of the optical imaging lens.
In one embodiment, the optical imaging lens may satisfy: and 0.2 & lt BFL/f & lt 0.8, wherein BFL is the distance from the image side surface of the fourth lens to the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens.
In one embodiment, the entrance pupil diameter EPD of the optical imaging lens and the total effective focal length f of the optical imaging lens may satisfy: f/EPD > 4.
In one embodiment, the optical imaging lens further includes a prism between the object side and the first lens, the prism reflecting light incident to the prism in an incident direction to exit from the prism in an optical axis direction.
The optical imaging lens is applicable to portable electronic products and has at least one beneficial effect of long focus, miniaturization, good imaging quality and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 shows a schematic structural view of an optical imaging lens according to embodiment 1 of the present application;
fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 1;
fig. 3 is a schematic structural view showing an optical imaging lens according to embodiment 2 of the present application;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 2;
fig. 5 is a schematic structural view showing an optical imaging lens according to embodiment 3 of the present application;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 3;
fig. 7 is a schematic structural view showing an optical imaging lens according to embodiment 4 of the present application;
fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 4;
fig. 9 is a schematic structural view showing an optical imaging lens according to embodiment 5 of the present application;
fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 5;
fig. 11 is a schematic structural view showing an optical imaging lens according to embodiment 6 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 6;
fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application; and
fig. 14A to 14D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 7.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
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 application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for the sake of convenience of explanation, on the one hand. 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. On the other hand, the shape of the prism is slightly exaggerated and simplified in the drawing at the same time. Specifically, the shapes of the prisms shown in the drawings are shown by way of planar examples. In practical application, the size and structure of the prism can be specifically designed according to practical conditions.
Herein, 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.
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 the list of listed features, that 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.
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 in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The features, principles, and other aspects of the present application are described in detail below.
An optical imaging lens according to an exemplary embodiment of the present application may include a prism and four lenses having optical power. The four lenses with the focal power are respectively a first lens, a second lens, a third lens and a fourth lens. As shown in fig. 1, the prism T may reflect a light ray incident to the prism T in an incident direction Y, which may be perpendicular to the optical axis direction X, to exit from the prism T in the optical axis direction X. The four lenses are arranged in sequence from the prism to the image side along the optical axis. Any adjacent two lenses of the first lens to the fourth lens can have a spacing distance therebetween.
In an exemplary embodiment, by providing a prism in the optical imaging lens, the light may be deflected by a certain angle after passing through the prism to adjust the total effective focal length of the optical imaging lens.
In an exemplary embodiment, the first lens may have a positive power or a negative power; the second lens may have a positive optical power; the third lens may have a negative optical power; the fourth lens may have a positive power or a negative power. Through the reasonable arrangement of focal powers of the first lens to the fourth lens, the focal powers of the lenses are matched with each other, so that smaller aberration is realized, and the optimization time of the lens is shortened.
In another exemplary embodiment, the first lens may have a positive optical power, and the object-side surface thereof may be convex; the second lens can have positive focal power, and the object side surface of the second lens can be a convex surface, and the image side surface of the second lens can be a concave surface; the third lens element can have negative focal power, and the object-side surface can be convex and the image-side surface can be concave; the fourth lens element can have a positive power, and can have a convex object-side surface and a concave image-side surface. Through the focal power and the face type that rationally set up first lens to fourth lens, if through the focal power of rationally setting up the second lens, be favorable to the second lens to arrange with other lens rationally to be favorable to realizing less aberration, shorten camera lens optimization time.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: f/EPD > 4, where EPD is the entrance pupil diameter of the optical imaging lens and f is the total effective focal length of the optical imaging lens. More specifically, f and EPD may further satisfy: f/EPD > 4.4. The f/EPD is more than 4, so that the capability of the lens for containing light is favorably controlled, and the relative illumination of the lens is favorably improved.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: T34/(T12+ T23) ≧ 1.89, where T12 is the air space on the optical axis of the first lens and the second lens, T23 is the air space on the optical axis of the second lens and the third lens, and T34 is the air space on the optical axis of the third lens and the fourth lens. The requirement of T34/(T12+ T23) is more than or equal to 1.89, the sensitivity of the air gap thickness of the lens is effectively reduced, and the field curvature is corrected.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < f12/f < 1, where f12 is the combined focal length of the first and second lenses and f is the total effective focal length of the optical imaging lens. More specifically, f12 and f further satisfy: f12/f is more than 0.3 and less than 0.5. F12/f is more than 0 and less than 1, which is not only beneficial to realizing the large view field characteristic of the object space, but also beneficial to correcting the off-axis aberration of the lens and improving the imaging quality of the lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.88 ≦ CT2/CT3 < 3, where CT3 is the central thickness of the third lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis. More specifically, CT2 and CT3 further satisfy: CT2/CT3 is more than or equal to 0.88 and less than or equal to 2.1. The requirement of 0.88-CT 2/CT 3-3 is satisfied, which is beneficial to reducing the thickness sensitivity of the lens and correcting the field curvature.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.6 < f1/EPD < 4, where EPD is the entrance pupil diameter of the optical imaging lens and f1 is the effective focal length of the first lens. More specifically, EPD and f1 may further satisfy: 2.2 < f1/EPD < 3.5. Satisfying 1.6 < f1/EPD < 4 is not only beneficial to controlling the angle of view of the lens, but also beneficial to reducing the effective radius of the first lens, thereby being beneficial to satisfying the processing requirement of the first lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < (R1+ R3+ R6)/(f1+ f2+ f3) < 1.2, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, R1 is the radius of curvature of the object-side surface of the first lens, R3 is the radius of curvature of the object-side surface of the second lens, and R6 is the radius of curvature of the image-side surface of the third lens. More specifically, R1, R3, R6, f1, f2, and f3 further can satisfy: 0.2 < (R1+ R3+ R6)/(f1+ f2+ f3) < 0.8. Satisfy 0 < (R1+ R3+ R6)/(f1+ f2+ f3) < 1.2, be favorable to effectively collocating the focal power between each lens to can effectively reduce on-axis chromatic aberration, correct astigmatism and the field curvature of lens, be convenient for the matching of lens Chief Ray Angle (CRA), realize better imaging quality.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -3 < f3/R6 < -0.5, wherein f3 is the effective focal length of the third lens and R6 is the radius of curvature of the image-side surface of the third lens. More specifically, f3 and R6 may further satisfy: -2.1 < f3/R6 < -1.5. Satisfy-3 < f3/R6 < -0.5, be favorable to the reasonable curvature of controlling the third lens image side, make its field curvature contribution in reasonable range, reduce the face type sensitivity of the third lens image side.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: DT31/DT21 < 1, where DT21 is the effective radius of the object side of the second lens and DT31 is the effective radius of the object side of the third lens. The light converging lens meets the condition that DT31/DT21 is less than 1, is favorable for controlling the convergence of all light rays of a field of view in the lens and is favorable for improving the imaging quality of the field of view in the lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: ET3/CT3 is ETn/CTn, wherein ET3 is the edge thickness of the third lens, CT3 is the center thickness of the third lens on the optical axis, ETn is the edge thickness of any one of the first lens, the second lens and the fourth lens, CTn is the center thickness of any one of the first lens, the second lens and the fourth lens on the optical axis, and n is selected from 1, 2 or 4. The requirements of ET3/CT 3/ETn/CTn are met, and the processing and molding of each lens are facilitated.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.4 < (N1+ N2+ N3+ N4)/4 < 1.8, wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, N3 is the refractive index of the third lens, and N4 is the refractive index of the fourth lens. More specifically, N1, N2, N3, and N4 may further satisfy: 1.5 < (N1+ N2+ N3+ N4)/4 < 1.7. Satisfy 1.4 < (N1+ N2+ N3+ N4)/4 < 1.8, be favorable to optimizing out good image effect when reducing the cost, reduce the influence of chromatic aberration to the camera lens, improve imaging quality.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: TTL/f is less than 1, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens. The TTL/f is less than 1, and the characteristics of projecting the long focus of the lens, projecting the small depth of field and high magnification of the lens, miniaturization and the like are facilitated.
In an exemplary embodiment, an optical imaging lens according to the present application further includes a stop disposed between the first lens and the second lens. Illustratively, the optical imaging lens may satisfy: and 0.8 < SL/TTL < 1, wherein SL is the distance between the diaphragm and the imaging surface of the optical imaging lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens on the optical axis. The requirement that SL/TTL is more than 0.8 and less than 1 is met, the total length of the lens is favorably controlled, the imaging quality of the lens is improved, and the design difficulty of the lens is reduced.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: tan (Semi-FOV). times.f > 3mm, wherein the Semi-FOV is half of the maximum field angle of the optical imaging lens, and f is the total effective focal length of the optical imaging lens. More specifically, the Semi-FOV further satisfies: tan (Semi-FOV). times.f > 3.5 mm. The lens meets the requirement that Tan (Semi-FOV) x f is more than 3mm, and the imaging size of the lens can meet the requirement of the chip size.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: and 0.2 & lt BFL/f & lt 0.8, wherein BFL is the distance from the image side surface of the fourth lens to the imaging surface of the optical imaging lens on the optical axis, and f is the total effective focal length of the optical imaging lens. More specifically, BFL and f may further satisfy: BFL/f is more than 0.3 and less than 0.7. The requirement that BFL/f is more than 0.2 and less than 0.8 is met, the requirement of the lens on back focus is favorably realized, and an image formed by the lens can be better presented on a chip.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: f is more than 13mm, wherein f is the total effective focal length of the optical imaging lens. More specifically, f further satisfies: f is more than 18 mm. Satisfies the condition that f is larger than 13mm, and is beneficial to realizing the long focus of the lens.
In an exemplary embodiment, the Semi-FOV may satisfy Semi-FOV < 11 °; the ImgH can meet the requirement that the ImgH is less than 4 mm; and TTL may be in the range of 17mm to 20 mm.
In an exemplary embodiment, the total effective focal length f of the optical imaging lens group may be, for example, in the range of 19.00mm to 20.41mm, the effective focal length f1 of the first lens may be, for example, in the range of 9.51mm to 13.95mm, the effective focal length f2 of the second lens may be, for example, in the range of 13.03mm to 62.45mm, the effective focal length f3 of the third lens may be, for example, in the range of-5.90 mm to-4.45 mm, and the effective focal length f4 of the fourth lens may be, for example, in the range of 14.75mm to 27.25 mm.
In an exemplary embodiment, an optical imaging lens according to the present application further includes a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging surface. The application provides an optical imaging lens with characteristics of miniaturization, long focus, high imaging quality and the like. The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above four lenses. 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, incident light can be effectively converged, the optical total length of the imaging lens is reduced, the processability of the imaging lens is improved, and the optical imaging lens is more favorable for production and processing.
In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the fourth lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. 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 the object-side surface and the image-side surface of each of the first lens, the second lens, the third lens, and the fourth lens is an aspheric mirror surface. Optionally, each of the first, second, third, and fourth lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed technical solutions. For example, although four lenses are exemplified in the embodiment, the optical imaging lens is not limited to include seven lenses. The optical imaging lens may also include other numbers of lenses, if desired.
Specific examples of an optical imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An optical imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic structural diagram of an optical imaging lens according to embodiment 1 of the present application.
As shown in fig. 1, the optical imaging lens includes, in order from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The prism T has a light incident surface, a light reflecting surface, and a light emitting surface. 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 positive 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 concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the light incident surface of the prism T to the image side surface S8 of the fourth lens E4 and is finally imaged on the imaging surface S11.
Table 1 shows a basic parameter table of the optical imaging lens of embodiment 1, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).
Figure BDA0003577129390000091
TABLE 1
In this example, the total effective focal length f of the optical imaging lens is 20.41mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens is 18.86mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half Semi-FOV of the maximum field angle of the optical imaging lens is 9.87 °, and the aperture value Fno of the optical imaging lens is 4.49.
In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the fourth lens E4 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:
Figure BDA0003577129390000092
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 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S8 used in example 14、A6、A8、A10、A12、A14、A16、A18And A20。
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
TABLE 2
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 angles of view. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents a deviation of different image heights on the imaging plane after 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.
Example 2
An optical imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present application.
As shown in fig. 3, the optical imaging lens includes, in order from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The prism T has a light incident surface, a light reflecting surface, and a light emitting surface. The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive 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 concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the light incident surface of the prism T to the image side surface S8 of the fourth lens E4 and is finally imaged on the imaging surface S11.
In this example, the total effective focal length f of the optical imaging lens is 19.00mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens is 18.00mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half Semi-FOV of the maximum angle of view of the optical imaging lens is 10.71 °, and the aperture value Fno of the optical imaging lens is 4.52.
Table 3 shows a basic parameter table of the optical imaging lens of embodiment 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure BDA0003577129390000101
TABLE 3
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -4.3572E-03 -4.4987E-04 1.4918E-04 -1.4122E-05 4.4333E-06 -4.3012E-06 -2.6467E-07 -8.3269E-07 -1.4586E-06
S2 1.1733E-03 3.7534E-04 2.3076E-04 -8.7168E-05 3.4610E-05 -1.4554E-05 5.6530E-06 -1.6177E-06 2.2867E-07
S3 8.8864E-03 5.3433E-03 1.0889E-03 -3.3175E-04 1.6905E-04 -6.3297E-05 2.5196E-05 -9.3622E-06 6.2044E-07
S4 -7.5931E-03 7.6988E-04 3.3833E-03 -6.3267E-04 7.6476E-04 -3.1059E-04 4.1059E-05 -9.4647E-05 3.7603E-06
S5 -3.3346E-03 -3.9152E-03 1.2175E-03 -5.6571E-04 2.6527E-04 -9.9532E-05 4.2757E-05 -1.0309E-05 7.5997E-07
S6 -1.3006E-02 -1.3085E-03 1.9919E-04 -6.6755E-05 3.8773E-05 -1.7465E-05 8.2743E-06 -3.4486E-06 5.8468E-07
S7 1.1505E-03 4.2513E-03 6.1565E-04 -2.9831E-04 -1.2707E-04 6.7745E-05 1.1581E-04 5.5087E-05 -5.1081E-06
S8 1.3292E-02 1.1083E-03 3.5780E-04 8.1644E-05 9.8658E-05 5.1162E-05 6.2636E-05 4.1622E-05 3.3207E-05
TABLE 4
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 meridional field curvature and 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 angles of view. 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 plane after 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.
Example 3
An optical imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural view of an optical imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging lens includes, in order from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The prism T has a light incident surface, a light reflecting surface, and a light emitting surface. 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 positive 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 concave image-side surface S8. The filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the light incident surface of the prism T to the image side surface S8 of the fourth lens E4 and is finally imaged on the imaging surface S11.
In this example, the total effective focal length f of the optical imaging lens is 19.00mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens is 17.98mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half Semi-FOV of the maximum angle of view of the optical imaging lens is 10.79 °, and the aperture value Fno of the optical imaging lens is 4.52.
Table 5 shows a basic parameter table of the optical imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure BDA0003577129390000121
TABLE 5
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.6564E-04 2.9102E-05 -2.1104E-05 1.4154E-05 -4.3751E-06 4.9498E-06 -4.6245E-06 -8.2593E+01 5.5066E+01
S2 1.8315E-03 1.9014E-04 8.0186E-05 -2.3574E-05 6.8630E-06 -4.5776E-06 3.2648E-06 -6.2966E-07 -5.9926E-08
S3 -8.4752E-05 1.8701E-05 -4.5938E-05 -1.4192E-06 -2.1568E-05 -6.5080E-06 -4.7521E-06 -9.6712E-06 -1.9017E-05
S4 2.5972E-03 -3.7529E-03 -2.6400E-04 7.1772E-05 -6.1292E-05 -2.2193E-05 -2.9625E-05 -1.2680E-05 -7.8785E-06
S5 9.8184E-04 -1.1517E-02 1.0613E-03 -3.6373E-05 6.5765E-06 2.1662E-05 2.7564E-05 2.5317E-05 1.4617E-05
S6 -1.4306E-04 -6.0083E-03 4.7315E-04 5.3320E-06 1.6534E-05 4.5389E-06 3.3037E-06 -1.3550E-06 3.0260E-06
S7 -1.4188E-03 3.6527E-05 1.2736E-04 -9.8248E-05 2.3609E-05 -4.4026E-06 1.1924E-05 -1.9396E-05 -2.3502E-05
S8 1.1851E-03 -1.5134E-04 -3.6621E-05 5.8869E-05 -4.0188E-05 2.4900E-05 -2.1753E-05 -5.2264E-07 -4.0759E-05
TABLE 6
Fig. 6A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 3, which represent 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 meridional field curvature and 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 angles of view. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging plane after 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.
Example 4
An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging lens includes, in order from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The prism T has a light incident surface, a light reflecting surface, and a light emitting surface. The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive 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 concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the light incident surface of the prism T to the image side surface S8 of the fourth lens E4 and is finally imaged on the imaging surface S11.
In this example, the total effective focal length f of the optical imaging lens is 19.00mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens is 17.99mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half Semi-FOV of the maximum angle of view of the optical imaging lens is 10.78 °, and the aperture value Fno of the optical imaging lens is 4.52.
Table 7 shows a basic parameter table of the optical imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure BDA0003577129390000131
TABLE 7
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.6519E-03 1.5100E-04 -1.3882E-04 -1.3677E-05 6.2389E-06 -1.2859E-06 -1.2824E-06 4.4953E-07 1.8946E-08
S2 6.2908E-03 3.3165E-05 -2.0676E-04 3.4743E-06 6.4866E-06 9.0491E-07 -2.4949E-06 4.2871E-07 8.7950E-08
S3 1.6987E+04 -3.3967E+03 1.1325E+03 -4.8497E+02 2.4267E+02 -1.3482E+02 8.0891E+01 -5.1476E+01 3.4318E+01
S4 1.2077E-02 8.4659E-05 4.8390E-04 -4.2947E-05 3.9424E-06 1.0137E-05 1.6886E-06 1.1660E-06 1.3442E-07
S5 1.6804E-03 -1.6317E-02 9.2430E-04 5.3630E-04 1.2482E-03 6.4136E-04 3.0261E-04 9.4251E-05 2.4342E-05
S6 -6.0119E-04 -6.6105E-03 1.0312E-03 -4.1359E-04 -2.6996E-05 -1.1285E-04 -5.4362E-05 -2.7426E-05 -2.6872E-06
S7 9.2656E+02 9.2656E+02 9.2656E+02 9.2656E+02 9.2656E+02 2.9300E+00 2.9301E+00 9.2656E+02 9.2656E+02
S8 8.3944E+03 -1.6790E+03 5.5972E+02 -2.3991E+02 1.1997E+02 -6.6661E+01 4.0004E+01 -2.5462E+01 1.6979E+01
TABLE 8
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 meridional field curvature and 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 angles of view. 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 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.
Example 5
An optical imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural diagram of an optical imaging lens according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging lens includes, in order from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The prism T has a light incident surface, a light reflecting surface, and a light emitting surface. The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive 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 concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the light incident surface of the prism T to the image side surface S8 of the fourth lens E4 and is finally imaged on the imaging surface S11.
In this example, the total effective focal length f of the optical imaging lens is 19.03mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens is 17.99mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half Semi-FOV of the maximum angle of view of the optical imaging lens is 10.70 °, and the aperture value Fno of the optical imaging lens is 4.49.
Table 9 shows a basic parameter table of the optical imaging lens of embodiment 5, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure BDA0003577129390000141
TABLE 9
Figure BDA0003577129390000142
Figure BDA0003577129390000151
TABLE 10
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 5. Fig. 10C shows a distortion curve of the optical imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different angles of view. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging lens according to embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic structural view of an optical imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, the optical imaging lens includes, in order from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The prism T has a light incident surface, a light reflecting surface, and a light emitting surface. The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive 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 concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the light incident surface of the prism T to the image side surface S8 of the fourth lens E4 and is finally imaged on the imaging surface S11.
In this example, the total effective focal length f of the optical imaging lens is 19.00mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens is 18.00mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half Semi-FOV of the maximum angle of view of the optical imaging lens is 10.71 °, and the aperture value Fno of the optical imaging lens is 4.52.
Table 11 shows a basic parameter table of the optical imaging lens of embodiment 6, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure BDA0003577129390000152
Figure BDA0003577129390000161
TABLE 11
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -4.3572E-03 -4.4987E-04 1.4918E-04 -1.4122E-05 4.4333E-06 -4.3012E-06 -2.6467E-07 -8.3269E-07 -1.4586E-06
S2 1.1733E-03 3.7534E-04 2.3076E-04 -8.7168E-05 3.4610E-05 -1.4554E-05 5.6530E-06 -1.6177E-06 2.2867E-07
S3 8.8864E-03 5.3433E-03 1.0889E-03 -3.3175E-04 1.6905E-04 -6.3297E-05 2.5196E-05 -9.3622E-06 6.2044E-07
S4 -7.5931E-03 7.6988E-04 3.3833E-03 -6.3267E-04 7.6476E-04 -3.1059E-04 4.1059E-05 -9.4647E-05 3.7603E-06
S5 -3.3346E-03 -3.9152E-03 1.2175E-03 -5.6571E-04 2.6527E-04 -9.9532E-05 4.2757E-05 -1.0309E-05 7.5997E-07
S6 -1.3006E-02 -1.3085E-03 1.9919E-04 -6.6755E-05 3.8773E-05 -1.7465E-05 8.2743E-06 -3.4486E-06 5.8468E-07
S7 1.1505E-03 4.2513E-03 6.1565E-04 -2.9831E-04 -1.2707E-04 6.7745E-05 1.1581E-04 5.5087E-05 -5.1081E-06
S8 1.3292E-02 1.1083E-03 3.5780E-04 8.1644E-05 9.8658E-05 5.1162E-05 6.2636E-05 4.1622E-05 3.3207E-05
TABLE 12
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 6. Fig. 12C shows a distortion curve of the optical imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different angles of view. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 6, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 12A to 12D, the optical imaging lens according to embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 is a schematic view showing a configuration of an optical imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, the optical imaging lens includes, in order from an object side to an image side: a prism T, a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The prism T has a light incident surface, a light reflecting surface, and a light emitting surface. The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive 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 concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the light incident surface of the prism T to the image side surface S8 of the fourth lens E4 and is finally imaged on the image plane S11.
In this example, the total effective focal length f of the optical imaging lens is 19.00mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S11 of the optical imaging lens is 18.00mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the optical imaging lens is 3.63mm, the half Semi-FOV of the maximum angle of view of the optical imaging lens is 10.68 °, and the aperture value Fno of the optical imaging lens is 4.49.
Table 13 shows a basic parameter table of the optical imaging lens of embodiment 7, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure BDA0003577129390000171
Watch 13
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.2985E-02 -3.2290E-05 4.5340E-04 1.4656E-04 1.4700E-05 -7.6948E-06 -3.5600E-06 -6.2772E-07 -4.3409E-08
S2 1.5610E-03 1.0389E-03 4.9664E-04 9.9338E-05 -4.1588E-07 -5.5321E-06 -1.4901E-06 -1.8942E-07 -1.0176E-08
S3 6.4451E-03 2.5420E-03 7.2590E-04 1.5856E-04 2.3029E-05 1.3274E-06 -2.1363E-07 -5.0434E-08 -3.3208E-09
S4 3.6900E-03 8.2405E-04 2.0515E-04 4.3255E-05 8.1584E-06 1.5467E-06 2.5476E-07 2.8257E-08 1.4841E-09
S5 1.8999E-03 -1.8141E-03 -4.5017E-04 -5.5069E-05 1.4179E-06 1.7647E-06 3.0221E-07 2.3461E-08 6.6824E-10
S6 -6.3040E-03 -9.0162E-04 -2.7256E-04 -2.3137E-05 4.8065E-06 2.2633E-06 4.5718E-07 5.1888E-08 2.6525E-09
S7 2.0586E-02 2.4529E-03 8.2972E-05 -1.8217E-05 3.9661E-06 2.3929E-06 4.1204E-07 3.0635E-08 6.5621E-10
S8 2.1751E-02 1.7756E-03 -3.3705E-06 -5.0773E-05 -1.2126E-05 -7.6899E-07 2.2692E-07 5.4836E-08 3.8849E-09
TABLE 14
Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 7, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 7. Fig. 14C shows a distortion curve of the optical imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different angles of view. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 7, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 14A to 14D, the optical imaging lens according to embodiment 7 can achieve good imaging quality.
In summary, examples 1 to 7 each satisfy the relationship shown in table 15.
Figure BDA0003577129390000172
Figure BDA0003577129390000181
Watch 15
The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.
The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (10)

1. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:
a first lens having an optical power;
a second lens having positive optical power;
a third lens having a negative optical power; and
a fourth lens having a focal power;
the entrance pupil diameter EPD of the optical imaging lens and the total effective focal length f of the optical imaging lens meet: f/EPD > 4.
2. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies: T34/(T12+ T23) ≧ 1.89, where T12 is an air space on the optical axis of the first lens and the second lens, T23 is an air space on the optical axis of the second lens and the third lens, and T34 is an air space on the optical axis of the third lens and the fourth lens.
3. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies: 0 < f12/f < 1, wherein f12 is the combined focal length of the first and second lenses.
4. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies: 0.88 ≦ CT2/CT3 < 3, where CT3 is the central thickness of the third lens on the optical axis and CT2 is the central thickness of the second lens on the optical axis.
5. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies: 1.6 < f1/EPD < 4, where EPD is the entrance pupil diameter of the optical imaging lens and f1 is the effective focal length of the first lens.
6. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: 0 < (R1+ R3+ R6)/(f1+ f2+ f3) < 1.2, wherein f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, f3 is an effective focal length of the third lens, R1 is a radius of curvature of an object-side surface of the first lens, R3 is a radius of curvature of an object-side surface of the second lens, and R6 is a radius of curvature of an image-side surface of the third lens.
7. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies: -3 < f3/R6 < -0.5, wherein f3 is the effective focal length of the third lens and R6 is the radius of curvature of the image-side surface of the third lens.
8. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies: DT31/DT21 < 1, where DT21 is the effective radius of the object side of the second lens and DT31 is the effective radius of the object side of the third lens.
9. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: ET3/CT3 ≧ ETn/CTn, where ET3 is an edge thickness of the third lens, CT3 is a center thickness of the third lens on the optical axis, ETn is an edge thickness of any one of the first lens, the second lens, and the fourth lens, and CTn is a center thickness of any one of the first lens, the second lens, and the fourth lens on the optical axis.
10. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:
a first lens having a positive refractive power, an object-side surface of which is convex;
the second lens with positive focal power has a convex object-side surface and a concave image-side surface;
a third lens with negative focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; and
a fourth lens with positive focal power, wherein the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface;
the total effective focal length f of the optical imaging lens meets the following requirements: f is more than 13 mm.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110456481A (en) * 2019-08-19 2019-11-15 浙江舜宇光学有限公司 Optical imaging lens
US20220011552A1 (en) * 2020-07-08 2022-01-13 Zhejiang Sunny Optics Co., Ltd. Optical Imaging Lens Assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110456481A (en) * 2019-08-19 2019-11-15 浙江舜宇光学有限公司 Optical imaging lens
US20220011552A1 (en) * 2020-07-08 2022-01-13 Zhejiang Sunny Optics Co., Ltd. Optical Imaging Lens Assembly

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