CN115437108A - Optical imaging lens - Google Patents
Optical imaging lens Download PDFInfo
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- CN115437108A CN115437108A CN202210598101.8A CN202210598101A CN115437108A CN 115437108 A CN115437108 A CN 115437108A CN 202210598101 A CN202210598101 A CN 202210598101A CN 115437108 A CN115437108 A CN 115437108A
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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
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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
- G02B13/18—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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Abstract
The application discloses optical imaging lens includes following preface from object side to image side along optical axis: a first lens having a negative optical power; a second lens having a positive optical power; a third lens having positive optical power; a fourth lens having a negative optical power; a fifth lens having a positive optical power; a sixth lens having positive optical power; and a seventh lens having a negative optical power. At least three of the first lens, the second lens and the third lens are made of plastic. The fifth lens is made of glass, and the object side surface and the image side surface of the fifth lens are both spherical surfaces. The effective focal length f1 of the first lens, the effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens satisfy the following conditions: f 1/(f 4+ f 7) < 1.3 < 0.5.
Description
Divisional application statement
The application is a divisional application of a Chinese patent application with the invention name of 'optical imaging lens' and the application number of 202110618104.9, which is filed in 2021, 06, 03.
Technical Field
The present application relates to the field of optical elements, and more particularly, to an optical imaging lens.
Background
With the development of video monitoring towards high definition, from the first 30 ten thousand pixels to 300 ten thousand pixels, the global video monitoring technology is undergoing a technological innovation, and a monitoring lens as a core component of video monitoring is beginning to enter a stage of high-speed development. The security monitoring system is being more and more widely applied to the monitoring of road traffic industry, production, hospitals, airports, libraries and other public places as an important development field of video monitoring, and the security camera is a vital component in the security monitoring system, however, the number of lenses with large aperture and large target surface on the market is small, and most of the lenses are all-glass lenses, and the cost of the lenses is high, so that the development of the market at present increasingly needs to achieve high-definition imaging on the basis of cost reduction, and the security lens with large aperture and large target surface.
Disclosure of Invention
An aspect of the present disclosure 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 positive optical power; a third lens having optical power; a fourth lens having a negative optical power; a fifth lens having a focal power; a sixth lens having positive optical power; and a seventh lens having optical power. At least three of the first lens element to the fourth lens element may be made of plastic. The fifth lens can be made of glass, and both the object side surface and the image side surface of the fifth lens can be spherical surfaces. The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens can satisfy f/EPD < 1.25.
In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens along the optical axis may satisfy: TTL is more than 27mm and less than 40mm.
In one embodiment, the effective focal length f1 of the first lens, the effective focal length f4 of the fourth lens, and the effective focal length f7 of the seventh lens may satisfy: f 1/(f 4+ f 7) < 0.5 < 1.3.
In one embodiment, the effective focal length f3 of the third lens, the effective focal length f6 of the sixth lens, and the effective focal length f5 of the fifth lens may satisfy: 1.2 < (f 3+ f 6)/f 5 < 1.9.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f of the optical imaging lens may satisfy: 1.0 < (R1 + R2)/f < 1.5.
In one embodiment, a curvature radius R11 of an object-side surface of the sixth lens element and a curvature radius R12 of an image-side surface of the sixth lens element may satisfy: 1.1 < (R11-R12)/(R11 + R12) < 2.2.
In one embodiment, a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T23 on the optical axis of the second lens and the third lens, a separation distance T45 on the optical axis of the fourth lens and the fifth lens, and a separation distance T56 on the optical axis of the fifth lens and the sixth lens may satisfy: 0.6 < T12/(T23 + T45+ T56) < 2.5.
In one embodiment, the maximum effective semi-caliber DT11 of the object-side surface of the first lens, the maximum effective semi-caliber DT71 of the object-side surface of the seventh lens and the maximum effective semi-caliber DT31 of the object-side surface of the third lens satisfy: 1.4 < (DT 11+ DT 71)/DT 31 < 1.9.
In one embodiment, the optical imaging lens further includes a diaphragm, and a distance SL from the diaphragm to the imaging surface along the optical axis and a combined focal length f345 of the third lens, the fourth lens, and the fifth lens may satisfy: 1.1 < SL/f345 < 1.6.
In one embodiment, a combined focal length f67 of the sixth lens and the seventh lens, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis may satisfy: f 67/(CT 6+ CT 7) < 6.9 < 2.4.
In one embodiment, an on-axis distance SAG11 from an intersection point of the object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens, an on-axis distance SAG12 from an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens, an on-axis distance SAG31 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 an on-axis distance SAG32 from an intersection point of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens may satisfy: 1.0 < (SAG 11+ SAG 12)/(SAG 31-SAG 32) < 1.7.
In one embodiment, an on-axis distance SAG51 from an intersection of the object-side surface of the fifth lens and the optical axis to an effective radius vertex of the object-side surface of the fifth lens, an on-axis distance SAG52 from an intersection of the image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens to an on-axis distance SAG61 from an intersection of the object-side surface of the sixth lens and the optical axis to an effective radius vertex of the object-side surface of the sixth lens, and an on-axis distance SAG62 from an intersection of the image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens may satisfy: 0.7 < (SAG 51-SAG 52)/(SAG 61-SAG 62) < 1.2.
In one embodiment, a center thickness CT3 of the third lens on the optical axis and an edge thickness ET3 of the third lens may satisfy: 2.4 < CT3/ET3 < 3.2.
In one embodiment, the edge thicknesses ET1, ET2, ET4 of the first lens and the fourth lens and the edge thickness ET5 of the fifth lens may satisfy: 0.8 < (ET 1+ ET 2)/(ET 4+ ET 5) < 1.3.
Another aspect of the present disclosure provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a negative optical power; a second lens having positive optical power; a third lens having optical power; a fourth lens having a negative optical power; a fifth lens having optical power; a sixth lens having positive optical power; and a seventh lens having optical power. At least three of the first lens element to the fourth lens element may be made of plastic. The fifth lens can be made of glass, and both the object side surface and the image side surface of the fifth lens can be spherical surfaces. The effective focal length f1 of the first lens, the effective focal length f4 of the fourth lens and the effective focal length f7 of the seventh lens can satisfy: f 1/(f 4+ f 7) < 1.3 < 0.5.
In one embodiment, a distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens along the optical axis may satisfy: TTL is more than 27mm and less than 40mm.
In one embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy f/EPD < 1.25.
In one embodiment, the effective focal length f3 of the third lens, the effective focal length f6 of the sixth lens, and the effective focal length f5 of the fifth lens may satisfy: 1.2 < (f 3+ f 6)/f 5 < 1.9.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f of the optical imaging lens may satisfy: 1.0 < (R1 + R2)/f < 1.5.
In one embodiment, a curvature radius R11 of an object-side surface of the sixth lens element and a curvature radius R12 of an image-side surface of the sixth lens element may satisfy: 1.1 < (R11-R12)/(R11 + R12) < 2.2.
In one embodiment, a separation distance T12 of the first lens and the second lens on the optical axis, a separation distance T23 of the second lens and the third lens on the optical axis, a separation distance T45 of the fourth lens and the fifth lens on the optical axis, and a separation distance T56 of the fifth lens and the sixth lens on the optical axis may satisfy: 0.6 < T12/(T23 + T45+ T56) < 2.5.
In one embodiment, the maximum effective semi-caliber DT11 of the object-side surface of the first lens, the maximum effective semi-caliber DT71 of the object-side surface of the seventh lens and the maximum effective semi-caliber DT31 of the object-side surface of the third lens satisfy: 1.4 < (DT 11+ DT 71)/DT 31 < 1.9.
In one embodiment, the optical imaging lens further includes a stop, and a distance SL from the stop to the imaging surface along the optical axis and a combined focal length f345 of the third lens, the fourth lens and the fifth lens may satisfy: 1.1 < SL/f345 < 1.6.
In one embodiment, a combined focal length f67 of the sixth lens and the seventh lens, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis may satisfy: f 67/(CT 6+ CT 7) < 6.9 < 2.4.
In one embodiment, an on-axis distance SAG11 from an intersection of the object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens, an on-axis distance SAG12 from an intersection of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens, an on-axis distance SAG31 from an intersection 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 an on-axis distance SAG32 from an intersection of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens may satisfy: 1.0 < (SAG 11+ SAG 12)/(SAG 31-SAG 32) < 1.7.
In one embodiment, an on-axis distance SAG51 from an intersection point of an object-side surface of the fifth lens and the optical axis to a vertex of an effective radius of an object-side surface of the fifth lens, an on-axis distance SAG52 from an intersection point of an image-side surface of the fifth lens and the optical axis to a vertex of an effective radius of an image-side surface of the sixth lens to an on-axis distance SAG61 from an intersection point of an object-side surface of the sixth lens and the optical axis to a vertex of an effective radius of an object-side surface of the sixth lens, and an on-axis distance SAG62 from an intersection point of an image-side surface of the sixth lens and the optical axis to a vertex of an effective radius of an image-side surface of the sixth lens may satisfy: 0.7 < (SAG 51-SAG 52)/(SAG 61-SAG 62) < 1.2.
In one embodiment, a center thickness CT3 of the third lens on the optical axis and an edge thickness ET3 of the third lens may satisfy: 2.4 < CT3/ET3 < 3.2.
In one embodiment, the first lens edge thickness ET1, the second lens edge thickness ET2, the fourth lens edge thickness ET4, and the fifth lens edge thickness ET5 may satisfy: 0.8 < (ET 1+ ET 2)/(ET 4+ ET 5) < 1.3.
The seven-piece type lens framework is adopted, and the lens has the beneficial effects of at least one of large aperture, high pixel, low cost, good imaging quality and the like by reasonably distributing the focal power of each lens and optimally selecting the surface type, the thickness, the material and the like of each lens.
Drawings
Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:
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 axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, respectively;
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 axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, respectively;
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; and
fig. 12A to 12D 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 6.
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 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.
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. In this document, the surface of each lens closest to the subject is referred to as the object-side surface of the lens, and the surface of each lens closest to the image plane is referred to as 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 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.
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, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The following provides a detailed description of the features, principles, and other aspects of the present application.
The optical imaging lens according to the exemplary embodiment of the present application may include, for example, seven lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis.
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 positive optical power or a negative optical power; the fourth lens may have a negative optical power; the fifth lens may have a positive power or a negative power; the sixth lens may have a positive optical power; the seventh lens may have a positive power or a negative power. The second lens with positive focal power and the fourth lens with negative focal power are matched with the sixth lens with positive focal power, so that the distribution of focal power is facilitated, and the image quality of the lens can be improved on the basis of meeting the photographic effect.
In an exemplary embodiment, at least three of the first lens to the fourth lens may be made of plastic. The front four lenses adopt at least three plastic lenses, which is beneficial to reducing the manufacturing cost of the lens.
In an exemplary embodiment, the fifth lens may be made of glass. The object side surface and the image side surface of the fifth lens can be spherical surfaces.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression f/EPD < 1.25, where f is an effective focal length of the optical imaging lens and EPD is an entrance pupil diameter of the optical imaging lens.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 27mm < TTL < 40mm, where TTL is a distance along an optical axis from an object side surface of the first lens element to an imaging surface of the optical imaging lens. The distance from the object side surface of the first lens to the imaging surface of the optical imaging lens along the optical axis is controlled within the range, so that the phenomenon that the TTL is too short and the phase difference is increased to further reduce the performance of the lens can be avoided, meanwhile, the phenomenon that the overall size of the lens caused by too long TTL is not in accordance with the structural requirement can be avoided, the total size of the lens can be effectively reduced, and the market demand can be better met. More specifically, TTL can satisfy 27mm < TTL < 36mm.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.5 < f 1/(f 4+ f 7) < 1.3, where f1 is an effective focal length of the first lens, f4 is an effective focal length of the fourth lens, and f7 is an effective focal length of the seventh lens. By controlling the ratio of the effective focal length of the first lens to the sum of the effective focal length of the fourth lens and the effective focal length of the seventh lens within the range, the overall optical power distribution of the system can be facilitated, the risks of sensitivity increase, yield reduction and the like caused by excessive concentration on the first lens can be avoided, and a series of problems of sensitivity and the like caused by excessive concentration on the following lenses can be avoided. More specifically, f1, f4 and f7 may satisfy 0.6 < f 1/(f 4+ f 7) < 1.1.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 1.2 < (f 3+ f 6)/f 5 < 1.9, where f3 is an effective focal length of the third lens, f6 is an effective focal length of the sixth lens, and f5 is an effective focal length of the fifth lens. By controlling the ratio of the sum of the effective focal length of the third lens and the effective focal length of the sixth lens to the effective focal length of the fifth lens within the range, the overall optical power distribution of the system can be facilitated, the lens has better manufacturability, and the subsequent processing and assembly of the lens are facilitated. More specifically, f3, f6 and f5 may satisfy 1.2 < (f 3+ f 6)/f 5 < 1.8.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 1.0 < (R1 + R2)/f < 1.5, where R1 is a radius of curvature of an object-side surface of the first lens, R2 is a radius of curvature of an image-side surface of the first lens, and f is an effective focal length of the optical imaging lens. By controlling the ratio of the sum of the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the first lens to the effective focal length of the optical imaging lens within the range, the contribution of astigmatism and coma of the first lens can be controlled within a reasonable range, and astigmatism and coma left by the front lens can be effectively balanced, so that the lens has better imaging quality. More specifically, R1, R2 and f may satisfy 1.1 < (R1 + R2)/f < 1.4.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 1.1 < (R11-R12)/(R11 + R12) < 2.2, where R11 is a radius of curvature of an object-side surface of the sixth lens and R12 is a radius of curvature of an image-side surface of the sixth lens. By controlling the ratio of the difference between the curvature radius of the object-side surface of the sixth lens element and the curvature radius of the image-side surface of the sixth lens element to the sum of the curvature radius of the object-side surface of the sixth lens element and the curvature radius of the image-side surface of the sixth lens element within the range, the difficulty in the aspect of processing of the sixth lens element due to the fact that the sixth lens element is too thin can be avoided, the structural size of the sixth lens element is reasonably adjusted, and the system distortion influence quantity can be balanced while the system size is reduced and good processability is maintained. More specifically, R11 and R12 may satisfy 1.2 < (R11-R12)/(R11 + R12) < 2.2.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.6 < T12/(T23 + T45+ T56) < 2.5, where T12 is a separation distance of the first lens and the second lens on the optical axis, T23 is a separation distance of the second lens and the third lens on the optical axis, T45 is a separation distance of the fourth lens and the fifth lens on the optical axis, and T56 is a separation distance of the fifth lens and the sixth lens on the optical axis. The ratio of the sum of the spacing distance of the first lens and the second lens on the optical axis to the spacing distance of the second lens and the third lens on the optical axis to the sum of the spacing distance of the fourth lens and the fifth lens on the optical axis to the sum of the spacing distance of the fifth lens and the sixth lens on the optical axis is controlled in the range, so that the improvement of the integral large aperture effect of the lens can be facilitated, the field curvature and the chromatic aberration can be avoided, and the astigmatism and the spherical aberration are not easy to generate. More specifically, T12, T23, T45 and T56 may satisfy 0.7 < T12/(T23 + T45+ T56) < 2.4.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 1.4 < (DT 11+ DT 71)/DT 31 < 1.9, where DT11 is a maximum effective half aperture of an object side surface of the first lens, DT71 is a maximum effective half aperture of an object side surface of the seventh lens, and DT31 is a maximum effective half aperture of an object side surface of the third lens. By controlling the ratio of the sum of the maximum effective semi-caliber of the object-side surface of the first lens and the maximum effective semi-caliber of the object-side surface of the seventh lens to the maximum effective semi-caliber of the object-side surface of the third lens within the range, the longitudinal spherical aberration of the system can be improved, the ghost image at the center of the image plane can be improved, the chromatic aberration of the system can be effectively balanced, and the difficulty in the aspect of processing technology caused by the overlarge lenses can be avoided. More specifically, DT11, DT71 and DT31 may satisfy 1.5 < (DT 11+ DT 71)/DT 31 < 1.9.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 1.1 < SL/f345 < 1.6, where SL is a distance along an optical axis from a diaphragm of the optical imaging lens to an imaging surface of the optical imaging lens, and f345 is a combined focal length of the third lens, the fourth lens, and the fifth lens. By controlling the ratio of the distance from the diaphragm of the optical imaging lens to the imaging surface of the optical imaging lens along the optical axis to the combined focal length of the third lens, the fourth lens and the fifth lens within the range, the correction of high-order compound aberration can be further enhanced on the basis of reducing three-level aberrations such as spherical aberration, coma aberration, curvature of field and the like, in addition, the aperture can be increased, the light transmission amount of the optical system can be enhanced, the image surface brightness can be improved, and the image quality can be improved. More specifically, SL and f345 may satisfy 1.2 < SL/f345 < 1.5.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 2.4 < f 67/(CT 6+ CT 7) < 6.9, where f67 is a combined focal length of the sixth lens and the seventh lens, CT6 is a center thickness of the sixth lens on the optical axis, and CT7 is a center thickness of the seventh lens on the optical axis. By controlling the ratio of the combined focal length of the sixth lens and the seventh lens to the sum of the central thickness of the sixth lens on the optical axis and the central thickness of the seventh lens on the optical axis within the range, the overall performance of the system can be improved, the problem of the overall size increase of the system caused by the excessive thickness of the sixth lens and the seventh lens can be avoided, and the risk of the reduction of manufacturability caused by the excessive thickness of the sixth lens and the seventh lens can be avoided. More specifically, f67, CT6 and CT7 may satisfy 2.5 < f 67/(CT 6+ CT 7) < 6.8.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 1.0 < (SAG 11+ SAG 12)/(SAG 31-SAG 32) < 1.7, where SAG11 is an on-axis distance from an intersection of an object-side surface and an optical axis of the first lens to an effective radius vertex of the object-side surface of the first lens, SAG12 is an on-axis distance from an intersection of an image-side surface and an optical axis of the first lens to an effective radius vertex of the image-side surface of the first lens, SAG31 is an on-axis distance from an intersection of an object-side surface and an optical axis of the third lens to an effective radius vertex of the object-side surface of the third lens, and SAG32 is an on-axis distance from an intersection of an image-side surface and an optical axis of the third lens to an effective radius vertex of the image-side surface of the third lens. The ratio of the sum of the axial distance from the intersection point of the object side surface and the optical axis of the first lens to the effective radius peak of the object side surface of the first lens, the axial distance from the intersection point of the image side surface and the optical axis of the first lens to the effective radius peak of the image side surface of the first lens, and the difference of the axial distance from the intersection point of the object side surface and the optical axis of the third lens to the effective radius peak of the object side surface of the third lens and the axial distance from the intersection point of the image side surface and the optical axis of the third lens to the effective radius peak of the image side surface of the third lens is controlled to be within the range, so that the spherical aberration of the middle field and the coma of the edge field can be improved, the system has better aberration correction capability, the effective focal length of the system can be improved on the premise of keeping the imaging quality of the lens, the relative illumination of the system can be increased, and the imaging quality of the lens under a darker environment can be improved. More specifically, SAG11, SAG12, SAG31 and SAG32 may satisfy 1.1 < (SAG 11+ SAG 12)/(SAG 31-SAG 32) < 1.7.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.7 < (SAG 51-SAG 52)/(SAG 61-SAG 62) < 1.2, where SAG51 is an on-axis distance from an intersection of an object-side surface of the fifth lens and an optical axis to an effective radius vertex of the object-side surface of the fifth lens, SAG52 is an on-axis distance from an intersection of an image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens, SAG61 is an on-axis distance from an intersection of an object-side surface of the sixth lens and the optical axis to an effective radius vertex of the object-side surface of the sixth lens, and SAG62 is an on-axis distance from an intersection of an image-side surface of the sixth lens and the optical axis to an effective radius vertex of the image-side surface of the sixth lens. The ratio of the difference between the axial distance from the intersection point of the object-side surface of the fifth lens and the optical axis to the effective radius peak of the object-side surface of the fifth lens, the axial distance from the intersection point of the object-side surface of the fifth lens and the optical axis to the effective radius peak of the image-side surface of the fifth lens, the difference between the axial distance from the intersection point of the object-side surface of the sixth lens and the optical axis to the effective radius peak of the object-side surface of the sixth lens, and the axial distance from the intersection point of the image-side surface of the sixth lens and the optical axis to the effective radius peak of the image-side surface of the sixth lens is controlled to be within the range, so that the sensitivity of the fifth lens and the sixth lens can be improved, the stray light ghost image can be comprehensively improved, the better processing manufacturability of the lenses can be kept, and the mass production is ensured to be smooth. More specifically, SAG51, SAG52, SAG61 and SAG62 may satisfy 0.7 < (SAG 51-SAG 52)/(SAG 61-SAG 62) < 1.1.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 2.4 < CT3/ET3 < 3.2, where CT3 is a central thickness of the third lens on the optical axis, and ET3 is an edge thickness of the third lens. By controlling the ratio of the central thickness of the third lens on the optical axis to the edge thickness of the third lens within the range, the difficulty in processing caused by the over-thinness of the third lens can be effectively avoided, the system sensitivity can be reduced, and the overall yield can be improved. More specifically, CT3 and ET3 may satisfy 2.4 < CT3/ET3 < 3.1.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.8 < (ET 1+ ET 2)/(ET 4+ ET 5) < 1.3, where ET1 is an edge thickness of the first lens, ET2 is an edge thickness of the second lens, ET4 is an edge thickness of the fourth lens, and ET5 is an edge thickness of the fifth lens. By controlling the ratio of the sum of the edge thickness of the first lens and the edge thickness of the second lens to the sum of the edge thickness of the fourth lens and the edge thickness of the fifth lens within the range, the longitudinal spherical aberration of the system can be improved, the ghost image at the center of the image plane can be improved, and the structural stability of the system can be enhanced. More specifically, ET1, ET2, ET4 and ET5 can satisfy 0.9 < (ET 1+ ET 2)/(ET 4+ ET 5) < 1.2.
In an exemplary embodiment, the optical imaging lens may further include at least one diaphragm. The diaphragm may be disposed at an appropriate position as needed, for example, between the second lens and the third lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface.
The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, seven lenses as described above. By reasonably distributing the focal power, the surface type, the material, the central thickness of each lens, the axial distance between each lens and the like, the lens has the characteristics of large aperture, high pixel, low cost, good imaging quality and the like.
In the embodiment of the present application, the mirror surfaces of the first lens, the second lens, the third lens, the fourth lens, the sixth lens, and the seventh lens may have at least one aspherical mirror surface, that is, at least one aspherical mirror surface may be included in the object side surface of the first lens to the image side surface of the fourth lens and the object side surface of the sixth lens to the image side surface of the seventh lens. 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 in imaging can be eliminated as much as possible, and the imaging quality is further improved. 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 sixth lens, and the seventh lens is an aspherical mirror surface. Optionally, each of the first, second, third, fourth, sixth, and seventh 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 seven 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 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 seventh lens E7, and a filter E8.
The first lens element E1 has a negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has a positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave 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 positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has a negative refractive power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 1 shows basic parameters of the optical imaging lens of embodiment 1, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm).
TABLE 1
In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 to the fourth lens E4 and the sixth lens E6 and the seventh lens E7 are aspheric, and the surface type x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:
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 =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. The high-order term coefficients A usable for the aspherical mirror surfaces S1 to S8 and S11 to S14 in example 1 are shown in tables 2-1 and 2-2 below 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
| Flour mark | A4 | A6 | A8 | A10 | A12 |
| S1 | -2.1157E-03 | -2.2595E-05 | 2.8773E-06 | -1.3232E-07 | 4.3570E-09 |
| S2 | -1.3069E-03 | -5.2670E-05 | 1.0070E-05 | -1.0569E-06 | 8.5885E-08 |
| S3 | -6.0255E-05 | 1.0781E-07 | -4.8160E-07 | -3.5394E-08 | 1.1013E-09 |
| S4 | 4.7784E-04 | -7.6861E-06 | 1.5146E-07 | -4.2443E-08 | 1.7884E-09 |
| S5 | 3.1614E-04 | -7.4246E-06 | 7.1449E-07 | -5.7593E-08 | 2.1728E-09 |
| S6 | 1.7050E-03 | -6.4460E-05 | 3.9641E-06 | -1.9482E-07 | 6.0804E-09 |
| S7 | -3.0431E-03 | 1.6085E-04 | -7.2779E-06 | 2.1164E-07 | -3.9917E-09 |
| S8 | -5.9850E-03 | 3.9385E-04 | -2.4739E-05 | 1.2214E-06 | -4.4136E-08 |
| S11 | 1.7403E-03 | -8.2817E-05 | 5.8346E-06 | -2.9641E-07 | 1.0865E-08 |
| S12 | 4.6476E-03 | -4.4417E-04 | 4.8347E-05 | -3.8966E-06 | 2.1855E-07 |
| S13 | -3.5722E-03 | 2.5180E-05 | -1.1225E-05 | 2.9763E-06 | -3.8976E-07 |
| S14 | -8.9386E-03 | 7.7589E-04 | -8.9433E-05 | 8.8875E-06 | -6.6528E-07 |
TABLE 2-1
| Flour mark | A14 | A16 | A18 | A20 |
| S1 | -9.8767E-11 | 1.3148E-12 | -7.7816E-15 | 0.0000E+00 |
| S2 | -4.9032E-09 | 1.8027E-10 | -3.8045E-12 | 3.5250E-14 |
| S3 | -2.9719E-11 | 5.6569E-13 | 0.0000E+00 | 0.0000E+00 |
| S4 | -4.0308E-11 | 6.7521E-13 | -6.3304E-15 | 0.0000E+00 |
| S5 | -4.6130E-11 | 5.5421E-13 | -2.9261E-15 | 0.0000E+00 |
| S6 | -1.1484E-10 | 1.2334E-12 | -5.8078E-15 | 0.0000E+00 |
| S7 | 5.0635E-11 | -4.2996E-13 | 2.2168E-15 | -5.1706E-18 |
| S8 | 1.0937E-09 | -1.6949E-11 | 1.3531E-13 | -1.8689E-16 |
| S11 | -2.5546E-10 | 3.3066E-12 | -1.7964E-14 | 0.0000E+00 |
| S12 | -8.1149E-09 | 1.8466E-10 | -2.2901E-12 | 1.1718E-14 |
| S13 | 2.8492E-08 | -1.2098E-09 | 2.7799E-11 | -2.6455E-13 |
| S14 | 3.4363E-08 | -1.1329E-09 | 2.1268E-11 | -1.7148E-13 |
Tables 2 to 2
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the convergent focus deviation 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 a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 2A to 2D, the optical imaging lens system 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, a description 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, in order from an object side to an image side along an optical axis, comprises: 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 seventh lens E7, and a filter E8.
The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has a positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave 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 positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 3 shows basic parameters of the optical imaging lens of embodiment 2, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 4-1 and 4-2 show the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to S8 and S11 to S14 in example 2 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 3
| Flour mark | A4 | A6 | A8 | A10 | A12 |
| S1 | -1.8287E-03 | -1.2328E-05 | 1.4752E-06 | -4.0340E-08 | 1.0778E-09 |
| S2 | -1.4049E-03 | -3.9926E-05 | 6.9088E-06 | -9.0651E-07 | 9.9191E-08 |
| S3 | -1.4438E-04 | -2.2217E-05 | -9.9606E-07 | 2.9418E-08 | -1.9263E-09 |
| S4 | 6.5540E-05 | -2.0489E-06 | -7.4358E-07 | 3.8067E-08 | -1.1963E-09 |
| S5 | 4.8961E-05 | 3.4026E-06 | 9.2977E-09 | -1.4857E-09 | -4.5515E-11 |
| S6 | 1.0031E-03 | -2.8164E-05 | 1.2069E-06 | -3.4579E-08 | 5.0887E-10 |
| S7 | -3.5686E-03 | 2.0208E-04 | -8.8493E-06 | 2.5869E-07 | -4.8729E-09 |
| S8 | -6.1171E-03 | 4.2538E-04 | -2.6698E-05 | 1.3500E-06 | -5.1550E-08 |
| S11 | 8.8433E-04 | -5.9321E-05 | 5.3286E-06 | -3.0275E-07 | 1.0734E-08 |
| S12 | 4.2027E-03 | -3.2375E-04 | 2.3538E-05 | -1.2609E-06 | 4.6222E-08 |
| S13 | -4.0383E-03 | 2.5517E-04 | -3.6709E-05 | 4.0425E-06 | -3.1949E-07 |
| S14 | -1.1000E-02 | 1.3080E-03 | -1.7030E-04 | 1.8134E-05 | -1.4265E-06 |
TABLE 4-1
| Flour mark | A14 | A16 | A18 | A20 |
| S1 | -3.0654E-11 | 5.2492E-13 | -3.3625E-15 | 0.0000E+00 |
| S2 | -6.9631E-09 | 2.9372E-10 | -6.8073E-12 | 6.7282E-14 |
| S3 | 7.5601E-11 | -1.2915E-12 | 0.0000E+00 | 0.0000E+00 |
| S4 | 2.1647E-11 | -1.5844E-13 | -2.5139E-16 | 0.0000E+00 |
| S5 | 1.2571E-12 | -7.2128E-15 | 0.0000E+00 | 0.0000E+00 |
| S6 | -3.6474E-12 | 1.0179E-14 | 0.0000E+00 | 0.0000E+00 |
| S7 | 5.7455E-11 | -4.0471E-13 | 1.5406E-15 | -2.4111E-18 |
| S8 | 1.3910E-09 | -2.4464E-11 | 2.4759E-13 | -1.0812E-15 |
| S11 | -2.3903E-10 | 3.2054E-12 | -2.3416E-14 | 7.1195E-17 |
| S12 | -1.1083E-09 | 1.6226E-11 | -1.2649E-13 | 3.7239E-16 |
| S13 | 1.6418E-08 | -5.1655E-10 | 9.0324E-12 | -6.7143E-14 |
| S14 | 7.6989E-08 | -2.6422E-09 | 5.1430E-11 | -4.2908E-13 |
TABLE 4-2
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the convergent focus deviation 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 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 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, in order from an object side to an image side along an optical axis, comprises: 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 seventh lens E7, and a filter E8.
The first lens element E1 has a negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has a positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive refractive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. The filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 5 shows basic parameters of the optical imaging lens of embodiment 3, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 6-1 and 6-2 show the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to S8 and S11 to S14 in example 3 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 5
| Flour mark | A4 | A6 | A8 | A10 | A12 |
| S1 | -1.5157E-03 | -1.0078E-05 | 8.8988E-07 | -8.6859E-09 | -9.0974E-10 |
| S2 | -8.6330E-04 | -2.5297E-05 | 3.7494E-06 | -2.7663E-07 | 2.1185E-08 |
| S3 | -1.9227E-04 | -2.6407E-05 | 1.6961E-06 | -1.1663E-07 | 4.8641E-09 |
| S4 | 5.2369E-04 | -4.5180E-05 | 2.8755E-06 | -1.3663E-07 | 3.8841E-09 |
| S5 | 6.5101E-04 | -7.2416E-05 | 5.9750E-06 | -3.4519E-07 | 1.3327E-08 |
| S6 | 1.7909E-03 | -1.0610E-04 | 7.4532E-06 | -3.9634E-07 | 1.4458E-08 |
| S7 | -2.9424E-03 | 1.9872E-04 | -1.3119E-05 | 7.1576E-07 | -3.2098E-08 |
| S8 | -5.7806E-03 | 5.0108E-04 | -4.4325E-05 | 3.2421E-06 | -1.7985E-07 |
| S11 | 1.5332E-03 | -8.2958E-05 | 8.5444E-06 | -7.7410E-07 | 4.9549E-08 |
| S12 | 4.2858E-03 | -2.2033E-04 | 5.5377E-06 | 6.3593E-07 | -9.2881E-08 |
| S13 | -5.3921E-03 | 3.5544E-04 | -3.9982E-05 | 2.8221E-06 | -1.2015E-07 |
| S14 | -1.1260E-02 | 1.2534E-03 | -1.5128E-04 | 1.4344E-05 | -1.0080E-06 |
TABLE 6-1
| Flour mark | A14 | A16 | A18 | A20 |
| S1 | 3.7934E-11 | -6.0244E-13 | 3.4682E-15 | 0.0000E+00 |
| S2 | -1.2954E-09 | 4.8161E-11 | -9.4663E-13 | 7.5138E-15 |
| S3 | -1.7004E-10 | 2.7843E-12 | 0.0000E+00 | 0.0000E+00 |
| S4 | -6.5657E-11 | 5.9126E-13 | -9.5930E-16 | 0.0000E+00 |
| S5 | -3.3656E-10 | 5.0173E-12 | -3.3045E-14 | 0.0000E+00 |
| S6 | -3.3907E-10 | 4.6311E-12 | -2.7871E-14 | 0.0000E+00 |
| S7 | 1.0898E-09 | -2.4855E-11 | 3.3245E-13 | -1.9754E-15 |
| S8 | 7.0595E-09 | -1.8144E-10 | 2.7147E-12 | -1.7873E-14 |
| S11 | -2.1340E-09 | 5.7785E-11 | -8.7421E-13 | 5.6100E-15 |
| S12 | 5.7079E-09 | -1.9421E-10 | 3.5918E-12 | -2.8354E-14 |
| S13 | 1.5913E-09 | 9.3569E-11 | -4.1689E-12 | 4.9013E-14 |
| S14 | 4.9763E-08 | -1.6094E-09 | 3.0457E-11 | -2.5538E-13 |
TABLE 6-2
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the convergent focus deviation 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 image heights. 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 system 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 configuration 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 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 seventh lens E7, and a filter E8.
The first lens element E1 has a negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has a positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive refractive power, and has a convex object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 7 shows basic parameters of the optical imaging lens of embodiment 4, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 8-1 and 8-2 show the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to S8 and S11 to S14 in example 4 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 7
| Flour mark | A4 | A6 | A8 | A10 | A12 |
| S1 | -1.0328E-03 | -6.3203E-06 | 4.2715E-07 | -9.8065E-09 | 1.8889E-10 |
| S2 | -5.9132E-04 | -1.3187E-05 | 1.1393E-06 | -6.7014E-08 | 4.2020E-09 |
| S3 | 1.7401E-05 | -6.1256E-06 | 1.9048E-07 | -4.2166E-08 | 1.9767E-09 |
| S4 | 4.1316E-04 | -1.1024E-05 | 3.2709E-07 | -2.1224E-08 | 5.8868E-10 |
| S5 | 2.8896E-04 | -1.1178E-05 | 5.6203E-07 | -2.8457E-08 | 8.2895E-10 |
| S6 | 1.1047E-03 | -4.0287E-05 | 1.7937E-06 | -6.1404E-08 | 1.3414E-09 |
| S7 | -1.4467E-03 | 6.6731E-05 | -3.4822E-06 | 1.5275E-07 | -5.2118E-09 |
| S8 | -3.1327E-03 | 1.6870E-04 | -9.6776E-06 | 4.6681E-07 | -1.6918E-08 |
| S11 | 1.0320E-03 | -4.6246E-05 | 3.2892E-06 | -2.1055E-07 | 1.0338E-08 |
| S12 | 2.5425E-03 | -1.2469E-04 | 6.0638E-06 | -2.3246E-07 | 7.0067E-09 |
| S13 | -3.1470E-03 | 9.0742E-05 | -7.0080E-06 | 3.5498E-07 | -1.1617E-08 |
| S14 | -6.7816E-03 | 4.9447E-04 | -4.1505E-05 | 2.7378E-06 | -1.3061E-07 |
TABLE 8-1
TABLE 8-2
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the convergent focus deviation 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 image heights. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents a deviation of different image heights on the imaging surface 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, in order from an object side to an image side along an optical axis, comprises: 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 seventh lens E7, and a filter E8.
The first lens element E1 has a negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has a positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave 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 positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has a negative refractive power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 9 shows basic parameters of the optical imaging lens of embodiment 5, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 10-1 and 10-2 show the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to S8 and S11 to S14 in example 5 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 9
| Flour mark | A4 | A6 | A8 | A10 | A12 |
| S1 | -1.5342E-03 | -1.0231E-05 | 3.7384E-07 | -8.1468E-09 | 9.8791E-10 |
| S2 | -8.7728E-04 | -1.1234E-05 | -1.2836E-07 | 4.4162E-08 | -3.1551E-10 |
| S3 | -4.8384E-04 | 2.2808E-05 | -1.2136E-06 | -1.0758E-07 | 9.5853E-09 |
| S4 | 3.1025E-04 | 2.4130E-05 | -3.7182E-06 | 1.8849E-07 | -5.3767E-09 |
| S5 | 4.3024E-04 | 1.5960E-05 | -3.7340E-06 | 2.1357E-07 | -6.8998E-09 |
| S6 | 1.9937E-03 | -9.6641E-05 | 4.2396E-06 | -1.6033E-07 | 5.1446E-09 |
| S7 | -2.1566E-03 | 1.3624E-04 | -1.0665E-05 | 5.7319E-07 | -1.9402E-08 |
| S8 | -5.6900E-03 | 4.7804E-04 | -4.0914E-05 | 2.8518E-06 | -1.4987E-07 |
| S11 | 1.6280E-03 | -7.7082E-05 | 8.8087E-06 | -7.8585E-07 | 4.8463E-08 |
| S12 | 3.7680E-03 | -7.0028E-05 | -2.3619E-05 | 4.6959E-06 | -4.7252E-07 |
| S13 | -5.8700E-03 | 4.2259E-04 | -6.6298E-05 | 7.6534E-06 | -6.7575E-07 |
| S14 | -1.1278E-02 | 1.1341E-03 | -1.2317E-04 | 9.6716E-06 | -4.2052E-07 |
TABLE 10-1
| Flour mark | A14 | A16 | A18 | A20 |
| S1 | -4.0486E-11 | 6.3260E-13 | -2.9731E-15 | 0.0000E+00 |
| S2 | -3.9833E-11 | 9.6883E-13 | 0.0000E+00 | 0.0000E+00 |
| S3 | -3.0479E-10 | 3.3117E-12 | 0.0000E+00 | 0.0000E+00 |
| S4 | 9.4322E-11 | -1.0914E-12 | 7.3619E-15 | 0.0000E+00 |
| S5 | 1.3356E-10 | -1.4374E-12 | 6.8219E-15 | 0.0000E+00 |
| S6 | -1.1615E-10 | 1.5453E-12 | -8.7631E-15 | 0.0000E+00 |
| S7 | 4.0137E-10 | -4.4655E-12 | 1.4571E-14 | 9.6060E-17 |
| S8 | 5.6451E-09 | -1.4243E-10 | 2.1400E-12 | -1.4431E-14 |
| S11 | -2.0138E-09 | 5.2413E-11 | -7.1948E-13 | 2.9391E-15 |
| S12 | 2.8874E-08 | -1.0731E-09 | 2.2328E-11 | -2.0028E-13 |
| S13 | 4.1969E-08 | -1.6550E-09 | 3.6574E-11 | -3.4155E-13 |
| S14 | -7.2451E-10 | 1.2339E-09 | -6.3289E-11 | 1.0964E-12 |
TABLE 10-2
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the convergent focus deviation 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 image heights. 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, in order from an object side to an image side along an optical axis, comprises: 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 seventh lens E7, and a filter E8.
The first lens element E1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has a positive refractive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative power, and has a convex object-side surface S7 and a concave 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 positive refractive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has a negative refractive power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side surface S15 and an image side surface S16. The optical imaging lens has an imaging surface S17, and light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 11 shows basic parameters of the optical imaging lens of embodiment 6, in which the unit of the radius of curvature and the thickness/distance are both millimeters (mm). Tables 12-1 and 12-2 show the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to S8 and S11 to S14 in example 6 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 Wherein each aspherical surface shape can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 11
TABLE 12-1
| Flour mark | A14 | A16 | A18 | A20 |
| S1 | 1.3147E-10 | -2.2546E-12 | 1.6299E-14 | 0.0000E+00 |
| S2 | -7.1309E-10 | 3.2686E-11 | -6.7424E-13 | 5.1537E-15 |
| S3 | -5.1456E-10 | 8.1264E-12 | 0.0000E+00 | 0.0000E+00 |
| S4 | 3.0521E-10 | -5.5506E-12 | 4.2662E-14 | 0.0000E+00 |
| S5 | 1.5841E-10 | -1.9112E-12 | 8.8307E-15 | 0.0000E+00 |
| S6 | -1.9021E-10 | 1.8290E-12 | -7.0963E-15 | 0.0000E+00 |
| S7 | 1.9996E-09 | -4.6325E-11 | 5.9956E-13 | -3.3005E-15 |
| S8 | 7.4680E-09 | -1.8432E-10 | 2.6164E-12 | -1.6158E-14 |
| S11 | -4.3816E-09 | 1.3483E-10 | -2.3529E-12 | 1.7581E-14 |
| S12 | 3.3844E-09 | -8.4322E-11 | 9.6636E-13 | -2.8470E-15 |
| S13 | 1.6591E-08 | -5.5171E-10 | 1.1567E-11 | -1.1858E-13 |
| S14 | 8.0983E-08 | -3.2621E-09 | 7.8828E-11 | -8.5424E-13 |
TABLE 12-2
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which represents the convergent focus deviation 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 image heights. 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.
Further, in embodiments 1 to 6, the effective focal length values f1 to f7 of the respective lenses, the effective focal length f of the optical imaging lens, the distance TTL along the optical axis from the object side surface of the first lens of the optical imaging lens to the imaging surface of the optical imaging lens, the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, and the maximum field angle FOV of the optical imaging lens are as shown in table 13.
Table 13 each of the conditional expressions in example 1 to example 6 satisfies the condition shown in table 14.
| Conditions/examples | 1 | 2 | 3 | 4 | 5 | 6 |
| f/EPD | 0.95 | 0.95 | 1.20 | 0.95 | 0.95 | 0.90 |
| TTL(mm) | 31.00 | 31.00 | 33.34 | 35.50 | 28.00 | 28.00 |
| f1/(f4+f7) | 0.67 | 0.79 | 0.85 | 0.87 | 0.98 | 1.05 |
| (f3+f6)/f5 | 1.40 | 1.30 | 1.48 | 1.65 | 1.59 | 1.70 |
| (R1+R2)/f | 1.24 | 1.34 | 1.15 | 1.29 | 1.30 | 1.31 |
| (R11-R12)/(R11+R12) | 2.11 | 1.74 | 1.27 | 1.47 | 1.27 | 1.35 |
| T12/(T23+T45+T56) | 0.95 | 2.19 | 0.74 | 0.77 | 1.70 | 2.35 |
| (DT11+DT71)/DT31 | 1.58 | 1.69 | 1.83 | 1.66 | 1.66 | 1.65 |
| SL/f345 | 1.25 | 1.23 | 1.36 | 1.34 | 1.27 | 1.41 |
| f67/(CT6+CT7) | 4.38 | 2.51 | 6.19 | 5.40 | 6.25 | 6.74 |
| (SAG11+SAG12)/(SAG31-SAG32) | 1.14 | 1.21 | 1.61 | 1.35 | 1.43 | 1.44 |
| (SAG51-SAG52)/(SAG61-SAG62) | 0.92 | 0.79 | 0.88 | 0.88 | 0.87 | 1.03 |
| CT3/ET3 | 2.97 | 2.50 | 2.68 | 2.98 | 2.61 | 2.81 |
| (ET1+ET2)/(ET4+ET5) | 1.06 | 0.96 | 0.93 | 1.11 | 1.06 | 0.99 |
TABLE 14
The present application also provides an imaging Device, which is provided with an electron photosensitive element to form an image, wherein the electron photosensitive element may be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (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 a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the scope of the present application. 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, in order from an object side to an image side along an optical axis, comprises:
a first lens having a negative optical power;
a second lens having a positive optical power;
a third lens having a positive optical power;
a fourth lens having a negative optical power;
a fifth lens having positive optical power;
a sixth lens having positive optical power; and
a seventh lens having a negative optical power,
the optical imaging lens satisfies:
at least three lenses of the first lens to the fourth lens are made of plastic;
the fifth lens is made of glass, and the object side surface and the image side surface of the fifth lens are spherical surfaces; and
0.5 < f 1/(f 4+ f 7) < 1.3, where f1 is an effective focal length of the first lens, f4 is an effective focal length of the fourth lens, and f7 is an effective focal length of the seventh lens.
2. The optical imaging lens of claim 1, wherein a distance TTL between an object side surface of the first lens element and an image plane of the optical imaging lens along the optical axis satisfies:
27mm＜TTL＜40mm。
3. the optical imaging lens of claim 2, wherein the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy:
0.90≤f/EPD＜1.25。
4. the optical imaging lens according to claim 1, wherein an effective focal length f3 of the third lens, an effective focal length f6 of the sixth lens, and an effective focal length f5 of the fifth lens satisfy:
1.2＜(f3+f6)/f5＜1.9。
5. the optical imaging lens of claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f of the optical imaging lens satisfy:
1.0＜(R1+R2)/f＜1.5。
6. the optical imaging lens according to claim 1, wherein a radius of curvature R11 of an object-side surface of the sixth lens and a radius of curvature R12 of an image-side surface of the sixth lens satisfy:
1.1＜(R11-R12)/(R11+R12)＜2.2。
7. the optical imaging lens according to claim 1, wherein a separation distance T12 on the optical axis of the first lens and the second lens, a separation distance T23 on the optical axis of the second lens and the third lens, a separation distance T45 on the optical axis of the fourth lens and the fifth lens, and a separation distance T56 on the optical axis of the fifth lens and the sixth lens satisfy:
0.6＜T12/(T23+T45+T56)＜2.5。
8. the optical imaging lens according to any one of claims 1 to 7, wherein the maximum effective semi-aperture diameter DT11 of the object-side surface of the first lens, the maximum effective semi-aperture diameter DT71 of the object-side surface of the seventh lens, and the maximum effective semi-aperture diameter DT31 of the object-side surface of the third lens satisfy:
1.4＜(DT11+DT71)/DT31＜1.9。
9. the optical imaging lens according to any one of claims 1 to 7, characterized in that the optical imaging lens further comprises a diaphragm, and a distance SL from the diaphragm to an imaging surface of the optical imaging lens along the optical axis and a combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy:
1.1＜SL/f345＜1.6。
10. the optical imaging lens according to any one of claims 1 to 7, characterized in that a combined focal length f67 of the sixth lens and the seventh lens, a central thickness CT6 of the sixth lens on the optical axis, and a central thickness CT7 of the seventh lens on the optical axis satisfy:
2.4＜f67/(CT6+CT7)＜6.9。
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