CN211905835U - Optical imaging lens group - Google Patents
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- CN211905835U CN211905835U CN202020391883.4U CN202020391883U CN211905835U CN 211905835 U CN211905835 U CN 211905835U CN 202020391883 U CN202020391883 U CN 202020391883U CN 211905835 U CN211905835 U CN 211905835U
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Abstract
The application discloses an optical imaging lens assembly, which comprises, in order from an object side to an image side along an optical axis: a first lens having an optical power; a second lens having an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens element having a negative refractive power, the object-side surface of which is concave; a sixth lens having a refractive power, an image-side surface of which is convex; and a seventh lens having optical power. The half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group satisfies: ImgH > 5.5 mm. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group satisfy that: TTL/ImgH is less than 1.35.
Description
Technical Field
The application relates to the field of optical elements, in particular to an optical imaging lens group.
Background
With the rapid development of portable electronic products such as smart phones in recent years, manufacturers of portable electronic products such as smart phones have put forward more and more new demands on portable electronic products such as smart phones. Imaging lenses of portable electronic products such as smart phones are increasingly pursuing the characteristic of high imaging quality, which provides higher challenges for the design of optical systems.
Generally, a photosensitive Device of a lens of a portable electronic product such as a smart phone is a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Sensor. Due to the continuous development of semiconductor manufacturing technology, the corresponding imaging lens also meets the requirement of high imaging quality. Therefore, the camera lens with good imaging quality is always a selling point for manufacturers of portable electronic products such as smart phones.
SUMMERY OF THE UTILITY MODEL
An aspect of the present application provides an optical imaging lens assembly, 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 an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens element having a negative refractive power, the object-side surface of which is concave; a sixth lens having a refractive power, an image-side surface of which is convex; and a seventh lens having optical power. The half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group can satisfy: ImgH > 5.5 mm. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group can satisfy the following conditions: TTL/ImgH is less than 1.35.
In one embodiment, at least one mirror surface of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror surface.
In one embodiment, the total effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group may satisfy: f/EPD < 1.9.
In one embodiment, the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens may satisfy: f2/f5 is more than 0.7 and less than 1.7.
In one embodiment, a separation distance T45 on the optical axis of the fourth lens and the fifth lens, a separation distance T56 on the optical axis of the fifth lens and the sixth lens, and a separation distance T67 on the optical axis of the sixth lens and the seventh lens may satisfy: 0.2 < (T45+ T56)/T67 < 0.7.
In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens group satisfy: f1/f is more than 0.5 and less than 1.0.
In one embodiment, the total effective focal length f of the optical imaging lens group, the Semi-FOV half of the maximum field angle of the optical imaging lens group, and the combined focal length f56 of the fifth and sixth lenses may satisfy: 0.3 < f × tan (Semi-FOV)/f56 < 0.8.
In one embodiment, the effective focal length f6 of the sixth lens and the combined focal length f1234 of the first, second, third, and fourth lenses may satisfy: 0.5 < f6/f1234 < 1.0.
In one embodiment, a distance SAG62 on the optical axis from the intersection point of the image-side surface of the sixth lens and the optical axis to the effective radius vertex of the image-side surface of the sixth lens and a distance SAG72 on the optical axis from the intersection point of the image-side surface of the seventh lens and the optical axis to the effective radius vertex of the image-side surface of the seventh lens may satisfy: 0.3 < SAG62/SAG72 < 0.8.
In one embodiment, a distance SAG11 on the optical axis from the intersection point of the object-side surface of the first lens and the optical axis to the effective radius vertex of the object-side surface of the first lens and a distance SAG52 on the optical axis from the intersection point of the image-side surface of the fifth lens and the optical axis to the effective radius vertex of the image-side surface of the fifth lens may satisfy: -1.0 < SAG52/SAG11 < -0.5.
In one embodiment, the edge thickness ET2 of the second lens and the edge thickness ET6 of the sixth lens may satisfy: 0.5 < ET2/ET6 < 1.5.
In one embodiment, the second lens has a negative power, the image-side surface of the second lens is concave, and the radius of curvature R4 of the image-side surface of the second lens and the total effective focal length f of the optical imaging lens group satisfy: r4/f is more than 0.5 and less than 1.5.
In one embodiment, the seventh lens has a negative power, the object-side surface of the seventh lens is concave, the image-side surface of the seventh lens is concave, and the radius of curvature R13 of the object-side surface of the seventh lens, the radius of curvature R14 of the image-side surface of the seventh lens, and the effective focal length f7 of the seventh lens satisfy: -1.0 < f7/(R13+ R14) < 0.
In one embodiment, the first lens has positive optical power, the object-side surface of the first lens is convex, the image-side surface of the first lens is concave, and the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: 0.5 < (R2-R1)/(R1+ R2) < 1.0.
In one embodiment, the radius of curvature R8 of the image-side surface of the fourth lens and the radius of curvature R9 of the object-side surface of the fifth lens may satisfy: 0.2 < (R8-R9)/(R8+ R9) < 1.2.
In one embodiment, the sixth lens element has positive optical power, the object-side surface of the sixth lens element is convex, and the radius of curvature R11 of the object-side surface of the sixth lens element and the radius of curvature R12 of the image-side surface of the sixth lens element satisfy: -1.3 < R12/R11 < -0.3.
In one embodiment, a central thickness CT1 of the first lens on the optical axis, a central thickness CT2 of the second lens on the optical axis, a central thickness CT3 of the third lens on the optical axis, a central thickness CT4 of the fourth lens on the optical axis, and a central thickness CT5 of the fifth lens on the optical axis may satisfy: 0.5 < (CT3+ CT4+ CT5)/(CT1+ CT2) < 1.0.
In one embodiment, the image-side surface of the fourth lens element may be convex.
Another aspect of the present application provides an optical imaging lens assembly, 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 an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens element having a negative refractive power, the object-side surface of which is concave; a sixth lens having a refractive power, an image-side surface of which is convex; and a seventh lens having optical power. The total effective focal length f of the optical imaging lens group, half of the Semi-FOV of the maximum field angle of the optical imaging lens group, and the combined focal length f56 of the fifth lens and the sixth lens may satisfy: 0.3 < f × tan (Semi-FOV)/f56 < 0.8. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group can satisfy the following conditions: TTL/ImgH is less than 1.35.
The optical imaging system has at least one beneficial effect of large image surface, good imaging quality and the like by reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like of each lens.
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 group according to embodiment 1 of the present application;
fig. 2A to 2D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 1;
fig. 3 shows a schematic structural view of an optical imaging lens group according to embodiment 2 of the present application;
fig. 4A to 4D 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 group of embodiment 2;
fig. 5 is a schematic view showing a structure of an optical imaging lens group according to embodiment 3 of the present application;
fig. 6A to 6D 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 group of embodiment 3;
fig. 7 is a schematic view showing a structure of an optical imaging lens group 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 group of embodiment 4;
fig. 9 is a schematic view showing a structure of an optical imaging lens group according to embodiment 5 of the present application;
fig. 10A to 10D respectively show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens group of example 5;
fig. 11 is a schematic view showing a structure of an optical imaging lens group according to embodiment 6 of the present application; and
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 group of example 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. 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 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 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.
The optical imaging lens group according to an exemplary embodiment of the present application may include seven lenses having optical power, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, respectively. The seven lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the seventh lens may have a spacing distance therebetween.
In an exemplary embodiment, the first lens may have a positive power or a negative power; the second lens may have a positive or negative optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens may have a positive power or a negative power; the fifth lens can have negative focal power, and the object side surface of the fifth lens can be a concave surface; the sixth lens can have positive focal power or negative focal power, and the image side surface of the sixth lens can be a convex surface; and the seventh lens may have a positive power or a negative power.
By reasonably controlling the distribution of the focal power of each lens of the optical imaging lens group, the low-order aberration of the system can be effectively balanced, and the tolerance sensitivity of the system can be effectively reduced.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: TTL/ImgH < 1.35, wherein, TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group. More specifically, TTL and ImgH may further satisfy: TTL/ImgH is less than 1.31. The TTL/ImgH is less than 1.35, and the miniaturization of the system is favorably realized.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: ImgH > 5.5mm, wherein ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group. More specifically, ImgH further satisfies: ImgH > 5.7 mm. The requirement that ImgH is more than 5.5mm can be met, the optical system has the characteristic of high pixel, and the system resolving power can be effectively improved.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: f/EPD < 1.9, wherein f is the total effective focal length of the optical imaging lens group, and EPD is the entrance pupil diameter of the optical imaging lens group. The f/EPD is less than 1.9, the light flux of the system can be increased, and the imaging effect in a dark environment is enhanced.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.7 < f2/f5 < 1.7, wherein f2 is the effective focal length of the second lens and f5 is the effective focal length of the fifth lens. More specifically, f2 and f5 may further satisfy: f2/f5 is more than 0.7 and less than 1.3. Satisfying 0.7 < f2/f5 < 1.7, the contribution amount of the second lens and the fifth lens to the curvature of field of the system can be well controlled.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.2 < (T45+ T56)/T67 < 0.7, wherein T45 is a distance between the fourth lens and the fifth lens on the optical axis, T56 is a distance between the fifth lens and the sixth lens on the optical axis, and T67 is a distance between the sixth lens and the seventh lens on the optical axis. More specifically, T45, T56, and T67 may further satisfy: 0.3 < (T45+ T56)/T67 < 0.6. The requirement that 0.2 < (T45+ T56)/T67 < 0.7 is met, the spacing distance from the fourth lens to the seventh lens can be reasonably distributed, the field curvature of the system can be reasonably controlled, and the system has better imaging capability.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < f1/f < 1.0, wherein f1 is the effective focal length of the first lens, and f is the total effective focal length of the optical imaging lens group. More specifically, f1 and f further satisfy: f1/f is more than 0.7 and less than 0.9. Satisfying 0.5 < f1/f < 1.0, the spherical aberration contribution of the first lens can be effectively controlled, and the system aberration can be reduced.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3 < f × tan (Semi-FOV)/f56 < 0.8, wherein f is the total effective focal length of the optical imaging lens group, the Semi-FOV is half of the maximum field angle of the optical imaging lens group, and f56 is the combined focal length of the fifth lens and the sixth lens. More specifically, f, Semi-FOV and f56 further satisfy: 0.5 < f × tan (Semi-FOV)/f56 < 0.7. The optical power of the fifth lens and the sixth lens can be well controlled, the contribution amount of the fifth lens and the sixth lens to the spherical aberration of the system can be reasonably controlled, the whole optical system has smaller spherical aberration, and the resolution of the system is improved.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < f6/f1234 < 1.0, where f6 is the effective focal length of the sixth lens and f1234 is the combined focal length of the first, second, third and fourth lenses. More specifically, f6 and f1234 further satisfy: 0.7 < f6/f1234 < 1.0. The optical power of the first four lenses and the focal power of the sixth lens can be reasonably distributed, and the positive spherical aberration and the negative spherical aberration generated by each element can be reasonably controlled, so that the system has smaller aberration, and the imaging capability of the system is improved.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3 < SAG62/SAG72 < 0.8, wherein SAG62 is a distance on the optical axis from the intersection point of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens, and SAG72 is a distance on the optical axis from the intersection point of the image side surface of the seventh lens and the optical axis to the effective radius vertex of the image side surface of the seventh lens. More specifically, SAG62 and SAG72 further may satisfy: 0.4 < SAG62/SAG72 < 0.7. The requirements that 0.3 is more than SAG62/SAG72 is more than 0.8 are met, the shapes of the sixth lens and the seventh lens can be well controlled, and further the light trend is controlled, so that the system is well matched with a chip.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: -1.0 < SAG52/SAG11 < -0.5, wherein SAG11 is the distance on the optical axis from the intersection of the object-side surface of the first lens and the optical axis to the vertex of the effective radius of the object-side surface of the first lens, and SAG52 is the distance on the optical axis from the intersection of the image-side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image-side surface of the fifth lens. More specifically, SAG52 and SAG11 further may satisfy: -1.0 < SAG52/SAG11 < -0.7. Satisfy-1.0 < SAG52/SAG11 < -0.5, can rationally control the shape of first lens and fifth lens, and then rationally distribute its focal power, make the lens that has positive focal power and the lens that has negative focal power match better in order to obtain better image quality.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < ET2/ET6 < 1.5, wherein ET2 is the edge thickness of the second lens and ET6 is the edge thickness of the sixth lens. More specifically, ET2 and ET6 further satisfy: 0.7 < ET2/ET6 < 1.2. The requirements that ET2/ET6 is more than 0.5 and less than 1.5 are met, the edge thicknesses of the second lens and the sixth lens can be well controlled, the processability of the lens is improved, the lens is favorably formed, and the image quality of an edge view field can be ensured.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < R4/f < 1.5, wherein R4 is the radius of curvature of the image side surface of the second lens, and f is the total effective focal length of the optical imaging lens group. More specifically, R4 and f further satisfy: r4/f is more than 0.8 and less than 1.3. The requirement that R4/f is more than 0.5 and less than 1.5 is met, the contribution of the image side of the second lens to the spherical aberration and the distortion of the system can be reduced, the system has less aberration, and the imaging capability of the system is improved.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: -1.0 < f7/(R13+ R14) < 0, wherein R13 is the radius of curvature of the object-side surface of the seventh lens, R14 is the radius of curvature of the image-side surface of the seventh lens, and f7 is the effective focal length of the seventh lens. More specifically, f7, R13, and R14 may further satisfy: -0.8 < f7/(R13+ R14) < -0.3. Satisfies the condition that f7/(R13+ R14) < 0 is more than-1.0, can better control the shape of the seventh lens, ensures the processing property of the lens, is beneficial to the molding of the lens and improves the yield of the system.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < (R2-R1)/(R1+ R2) < 1.0, wherein R1 is the radius of curvature of the object-side surface of the first lens and R2 is the radius of curvature of the image-side surface of the first lens. More specifically, R1 and R2 may further satisfy: 0.5 < (R2-R1)/(R1+ R2) < 0.8. Satisfy 0.5 < (R2-R1)/(R1+ R2) < 1.0, can effectively control the shape of the first lens, reduce the contribution of the first lens to high order aberration, make the system have better resolving power.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.2 < (R8-R9)/(R8+ R9) < 1.2, wherein R8 is a radius of curvature of an image-side surface of the fourth lens, and R9 is a radius of curvature of an object-side surface of the fifth lens. More specifically, R8 and R9 may further satisfy: 0.3 < (R8-R9)/(R8+ R9) < 0.8. The requirement that 0.2 < (R8-R9)/(R8+ R9) < 1.2 is met, the shapes of the fourth lens and the fifth lens can be effectively controlled, the contribution amount of the fourth lens and the fifth lens to high-order aberration is reduced, and the imaging capacity of the system is improved.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: -1.3 < R12/R11 < -0.3, wherein R11 is the radius of curvature of the object-side surface of the sixth lens and R12 is the radius of curvature of the image-side surface of the sixth lens. More specifically, R12 and R11 may further satisfy: -1.0 < R12/R11 < -0.5. The optical lens meets the requirements that R12/R11 is more than-1.3 and less than-0.3, can better control the shape and focal power of the sixth lens, reasonably control the trend of light rays, reduce the contribution amount of the lens to high-order aberration, enable the system to have smaller aberration and further improve the resolving power of the system.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < (CT3+ CT4+ CT5)/(CT1+ CT2) < 1.0, wherein CT1 is a central thickness of the first lens on the optical axis, CT2 is a central thickness of the second lens on the optical axis, CT3 is a central thickness of the third lens on the optical axis, CT4 is a central thickness of the fourth lens on the optical axis, and CT5 is a central thickness of the fifth lens on the optical axis. More specifically, CT3, CT4, CT5, CT1, and CT2 may further satisfy: 0.7 < (CT3+ CT4+ CT5)/(CT1+ CT2) < 0.9. The requirement of 0.5 < (CT3+ CT4+ CT5)/(CT1+ CT2) < 1.0 is met, the central thicknesses of the front five lenses are favorably and reasonably distributed, the contribution amount of each lens to the field curvature of the system can be well controlled, the system has smaller field curvature, and the performance of the system is further improved.
In an exemplary embodiment, the first lens may have a positive optical power, and the object side surface may be convex and the image side surface may be concave. The focal power and the surface type of the first lens are reasonably distributed, so that the low-order aberration of the system can be effectively balanced, the tolerance sensitivity of the system can be reduced, the imaging capability of the system can be improved, and the system has better image quality.
In an exemplary embodiment, the second lens may have a negative optical power, and the image-side surface thereof may be concave. The focal power and the surface type of the second lens are reasonably distributed, so that the low-order aberration of the system can be effectively balanced, the tolerance sensitivity of the system can be reduced, the imaging capability of the system can be improved, and the system has better image quality.
In an exemplary embodiment, the image-side surface of the fourth lens may be convex. The surface type of the fourth lens is reasonably distributed, so that the low-order aberration of the system can be effectively balanced, the tolerance sensitivity of the system can be reduced, the imaging capability of the system can be improved, and the system has better image quality.
In an exemplary embodiment, the sixth lens may have a positive optical power, and the object-side surface thereof may be convex. The focal power and the surface type of the sixth lens are reasonably distributed, so that the low-order aberration of the system can be effectively balanced, the tolerance sensitivity of the system can be reduced, the imaging capability of the system can be improved, and the system has better image quality.
In an exemplary embodiment, the seventh lens element may have a negative optical power, and the object-side surface thereof may be concave and the image-side surface thereof may be concave. The focal power and the surface type of the seventh lens are reasonably distributed, so that the low-order aberration of the system can be effectively balanced, the tolerance sensitivity of the system can be reduced, the imaging capability of the system can be improved, and the system has better image quality.
In an exemplary embodiment, an optical imaging lens group according to the present application further includes a stop disposed between the object side and the first lens. Optionally, the optical imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on an imaging surface.
The optical imaging lens group 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 central thickness of each lens, the on-axis distance between each lens and the like, the volume of the optical imaging lens group can be effectively reduced, and the processability of the optical imaging lens group can be improved, so that the optical imaging lens group is more favorable for production and processing and can be suitable for portable electronic products. The optical imaging lens group configured as described above can have features such as miniaturization, large image plane, good imaging quality, and the like.
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 seventh 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 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 fifth lens, the sixth lens, and the seventh lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, fifth, 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 group can be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although seven lenses are exemplified in the embodiment, the optical imaging lens group is not limited to include seven lenses. The optical imaging lens group may also include other numbers of lenses, if desired.
Specific examples of the optical imaging lens group applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An optical imaging lens group 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 group according to embodiment 1 of the present application.
As shown in fig. 1, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 1 shows a basic parameter table of the optical imaging lens group of embodiment 1, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 1
In the present example, the total effective focal length f of the optical imaging lens group is 6.70mm, the total length TTL of the optical imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens group) is 7.49mm, half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens group is 5.75mm, half semifov of the maximum field angle of the optical imaging lens group is 40.2 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 1.88.
In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 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:
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. The high-order term coefficients A usable for the aspherical mirror surfaces S1 to S14 in example 1 are shown in Table 2-1 and Table 2-2 below4、A6、A8、A10、A12、A14、A16、A18、 A20、A22、A24And A26。
TABLE 2-1
| Flour mark | A16 | A18 | A20 | A22 | A24 | A26 |
| S1 | 1.5944E-05 | -2.3601E-06 | -1.0439E-06 | 2.1059E-07 | -6.9402E-09 | 0.0000E+00 |
| S2 | -2.0101E-04 | 2.4675E-05 | -1.0873E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | 3.4033E-03 | -7.1881E-04 | 6.4741E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S4 | -1.9086E-03 | 1.6012E-04 | 2.7949E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S5 | -2.3735E-02 | 6.1714E-03 | -6.8358E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S6 | -7.2247E-03 | 1.1740E-03 | -7.1018E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S7 | -7.3711E-03 | 1.3108E-03 | -9.4429E-05 | -9.9422E-08 | 0.0000E+00 | 0.0000E+00 |
| S8 | -5.0357E-04 | 7.9572E-05 | -5.4578E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S9 | -2.0510E-04 | 2.9454E-05 | -1.7151E-06 | 5.7920E-08 | -5.8074E-09 | 0.0000E+00 |
| S10 | 5.1925E-05 | -3.4921E-06 | 9.2883E-08 | -2.2379E-09 | 1.8588E-10 | 0.0000E+00 |
| S11 | 6.8404E-05 | -5.3655E-06 | 1.9658E-07 | -5.6065E-09 | 3.2611E-10 | 0.0000E+00 |
| S12 | 1.6857E-06 | -1.1102E-07 | 2.4709E-09 | -1.3908E-12 | 8.4217E-13 | 0.0000E+00 |
| S13 | 5.7406E-08 | -1.0587E-09 | 4.1832E-12 | 1.4104E-13 | -2.5392E-15 | 4.2554E-17 |
| S14 | 3.3677E-09 | -4.1939E-11 | -1.9646E-13 | 4.2071E-15 | -7.7222E-17 | 0.0000E+00 |
Tables 2 to 2
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 1, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 1. Fig. 2C shows a distortion curve of the optical imaging lens group 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 group 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 assembly of embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging lens group 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 view of an optical imaging lens group according to embodiment 2 of the present application.
As shown in fig. 3, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In the present example, the total effective focal length f of the optical imaging lens group is 6.70mm, the total length TTL of the optical imaging lens group is 7.49mm, half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging lens group is 5.75mm, half Semi-FOV of the maximum field angle of the optical imaging lens group is 40.2 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 1.88.
Table 3 shows a basic parameter table of the optical imaging lens group of embodiment 2, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 4-1 and 4-2 show the 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 the formula (1) given in example 1 above.
TABLE 3
TABLE 4-1
| Flour mark | A16 | A18 | A20 | A22 | A24 | A26 |
| S1 | 8.1708E-04 | -1.3479E-04 | 9.2266E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | 2.1205E-04 | -6.4109E-05 | 7.0120E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | 2.4735E-03 | -5.2895E-04 | 4.8843E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S4 | -3.5496E-02 | 9.5726E-03 | -1.0953E-03 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S5 | -2.8167E-02 | 8.8175E-03 | -1.1312E-03 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S6 | -7.9611E-03 | 1.8710E-03 | -1.7914E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S7 | -1.5574E-02 | 3.4432E-03 | -3.0657E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S8 | -4.6182E-03 | 7.8493E-04 | -5.4758E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S9 | 1.1498E-03 | -1.7539E-04 | 1.2339E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S10 | 4.0544E-04 | -8.5265E-05 | 1.0760E-05 | -6.0268E-07 | 0.0000E+00 | 0.0000E+00 |
| S11 | 1.5736E-03 | -4.0273E-04 | 7.1639E-05 | -8.2208E-06 | 5.4069E-07 | -1.5390E-08 |
| S12 | 2.0245E-05 | -3.8673E-06 | 7.6730E-07 | -9.1701E-08 | 5.6484E-09 | -1.4042E-10 |
| S13 | -2.7597E-06 | 1.6146E-07 | -6.4103E-09 | 1.6400E-10 | -2.4221E-12 | 1.5513E-14 |
| S14 | -9.4782E-07 | 5.2393E-08 | -2.0059E-09 | 5.0399E-11 | -7.4543E-13 | 4.9018E-15 |
TABLE 4-2
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 2, which represents a 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 group of embodiment 2. Fig. 4C shows a distortion curve of the optical imaging lens group 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 group of embodiment 2, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 4A to 4D, the optical imaging lens assembly of embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging lens group 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 group according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In the present example, the total effective focal length f of the optical imaging lens group is 6.70mm, the total length TTL of the optical imaging lens group is 7.49mm, half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging lens group is 5.75mm, half Semi-FOV of the maximum field angle of the optical imaging lens group is 40.2 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 1.87.
Table 5 shows a basic parameter table of the optical imaging lens group of embodiment 3, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 6-1 and 6-2 show the 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 the formula (1) given in example 1 above.
TABLE 5
TABLE 6-1
| Flour mark | A16 | A18 | A20 | A22 | A24 | A26 |
| S1 | 6.8625E-04 | -1.1663E-04 | 8.2093E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | 4.0802E-05 | -2.3475E-05 | 3.0751E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | 1.4210E-03 | -3.1844E-04 | 3.0613E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S4 | -1.3302E-02 | 3.4843E-03 | -3.8392E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S5 | 1.6185E-02 | -3.1362E-03 | 2.2375E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S6 | -3.1363E-02 | 1.3092E-02 | -2.9561E-03 | 2.8048E-04 | 0.0000E+00 | 0.0000E+00 |
| S7 | -2.8685E-03 | 7.5425E-04 | -6.9287E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S8 | -2.5522E-03 | 4.6543E-04 | -3.4776E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S9 | -5.8100E-05 | 4.5409E-05 | -4.3223E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S10 | 7.2387E-04 | -1.1390E-04 | 1.0505E-05 | -4.3060E-07 | 0.0000E+00 | 0.0000E+00 |
| S11 | -3.5614E-04 | 5.1165E-05 | -3.5074E-07 | -8.8483E-07 | 1.0767E-07 | -4.1475E-09 |
| S12 | -4.3964E-04 | 7.5875E-05 | -8.5433E-06 | 6.0579E-07 | -2.4613E-08 | 4.3764E-10 |
| S13 | -8.5248E-06 | 6.0176E-07 | -2.8768E-08 | 8.9164E-10 | -1.6186E-11 | 1.3075E-13 |
| S14 | -1.4486E-06 | 8.2698E-08 | -3.2315E-09 | 8.2203E-11 | -1.2244E-12 | 8.0831E-15 |
TABLE 6-2
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 3, which represents a 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 group of embodiment 3. Fig. 6C shows a distortion curve of the optical imaging lens group 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 group of embodiment 3, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 6A to 6D, the optical imaging lens assembly according to embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging lens group 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 group according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has negative power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In the present example, the total effective focal length f of the optical imaging lens group is 6.71mm, the total length TTL of the optical imaging lens group is 7.49mm, half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging lens group is 5.75mm, half Semi-FOV of the maximum field angle of the optical imaging lens group is 40.2 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 1.85.
Table 7 shows a basic parameter table of the optical imaging lens group of embodiment 4, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 8-1 and 8-2 show the 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 the formula (1) given in example 1 above.
TABLE 7
TABLE 8-1
| Flour mark | A16 | A18 | A20 | A22 | A24 | A26 |
| S1 | 8.6690E-04 | -1.4393E-04 | 9.9617E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | -1.4104E-05 | -1.6439E-05 | 2.7331E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | 3.0346E-03 | -6.4619E-04 | 5.8653E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S4 | -1.2267E-02 | 3.2470E-03 | -3.6176E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S5 | 2.6474E-02 | -5.7499E-03 | 5.0947E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S6 | -2.9256E-02 | 1.1842E-02 | -2.6207E-03 | 2.4543E-04 | 0.0000E+00 | 0.0000E+00 |
| S7 | -2.4862E-03 | 6.2165E-04 | -5.5364E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S8 | -3.1711E-03 | 5.5931E-04 | -4.0563E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S9 | -7.6643E-04 | 1.4579E-04 | -1.0162E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S10 | 2.1602E-04 | -4.2412E-05 | 4.9750E-06 | -2.5362E-07 | 0.0000E+00 | 0.0000E+00 |
| S11 | 4.6883E-06 | -4.3492E-05 | 1.4627E-05 | -2.2974E-06 | 1.8040E-07 | -5.7055E-09 |
| S12 | -4.5163E-04 | 7.5315E-05 | -8.2223E-06 | 5.6726E-07 | -2.2497E-08 | 3.9159E-10 |
| S13 | -8.2266E-06 | 5.6654E-07 | -2.6410E-08 | 7.9717E-10 | -1.4073E-11 | 1.1039E-13 |
| S14 | -1.2104E-06 | 6.0009E-08 | -1.9359E-09 | 3.7236E-11 | -3.4818E-13 | 7.2116E-16 |
TABLE 8-2
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 4, which represents a 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 group of embodiment 4. Fig. 8C shows a distortion curve of the optical imaging lens group 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 group 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 assembly according to embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural view of an optical imaging lens group according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In the present example, the total effective focal length f of the optical imaging lens group is 6.70mm, the total length TTL of the optical imaging lens group is 7.49mm, half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging lens group is 5.75mm, half Semi-FOV of the maximum field angle of the optical imaging lens group is 40.1 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 1.87.
Table 9 shows a basic parameter table of the optical imaging lens group of embodiment 5, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 10-1 and 10-2 show the 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 the formula (1) given in example 1 above.
TABLE 9
TABLE 10-1
| Flour mark | A16 | A18 | A20 | A22 | A24 | A26 |
| S1 | 3.7694E-04 | -7.1193E-05 | 5.4827E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | -3.1447E-06 | -5.2726E-06 | 8.2469E-07 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | 1.9886E-03 | -4.1511E-04 | 3.7289E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S4 | -9.9470E-03 | 2.6067E-03 | -2.8349E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S5 | 4.3994E-02 | -1.0221E-02 | 9.7450E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S6 | 4.1937E-02 | -9.3856E-03 | 8.9357E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S7 | 6.0055E-04 | 2.6136E-04 | -4.1162E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S8 | -3.1523E-03 | 5.4219E-04 | -3.8897E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S9 | 1.4281E-05 | 6.3268E-06 | -6.7797E-07 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S10 | 5.8844E-04 | -1.0390E-04 | 9.8289E-06 | -3.8796E-07 | 0.0000E+00 | 0.0000E+00 |
| S11 | -1.8705E-03 | 4.3404E-04 | -6.2378E-05 | 5.2690E-06 | -2.3137E-07 | 3.7641E-09 |
| S12 | -4.5636E-04 | 8.3809E-05 | -9.9772E-06 | 7.4536E-07 | -3.1841E-08 | 5.9445E-10 |
| S13 | -8.3680E-06 | 5.3522E-07 | -2.3137E-08 | 6.4744E-10 | -1.0598E-11 | 7.7098E-14 |
| S14 | -1.2534E-06 | 6.0895E-08 | -1.9322E-09 | 3.6987E-11 | -3.5759E-13 | 9.9474E-16 |
TABLE 10-2
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 5, which represents a 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 group of embodiment 5. Fig. 10C shows a distortion curve of the optical imaging lens group 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 group of embodiment 5, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging lens assembly according to embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging lens group 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 group according to embodiment 6 of the present application.
As shown in fig. 11, the optical imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave 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 concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In the present example, the total effective focal length f of the optical imaging lens group is 6.71mm, the total length TTL of the optical imaging lens group is 7.49mm, half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the optical imaging lens group is 5.75mm, half Semi-FOV of the maximum field angle of the optical imaging lens group is 40.1 °, and the ratio f/EPD of the total effective focal length f of the optical imaging lens group to the entrance pupil diameter EPD of the optical imaging lens group is 1.87.
Table 11 shows a basic parameter table of the optical imaging lens group of example 6, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Tables 12-1, 12-2 show the 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 the formula (1) given in example 1 above.
TABLE 11
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 |
| S1 | 1.3435E-04 | -4.2473E-04 | 1.6175E-03 | -2.6055E-03 | 2.3007E-03 | -1.2193E-03 |
| S2 | -1.0998E-02 | 9.0517E-04 | 5.3208E-03 | -9.0514E-03 | 8.2102E-03 | -4.6204E-03 |
| S3 | -9.3145E-03 | 1.1007E-02 | 3.0338E-03 | -9.8007E-03 | 9.4671E-03 | -5.4638E-03 |
| S4 | -1.2356E-03 | 1.6670E-02 | -1.4156E-02 | 2.2182E-02 | -2.6472E-02 | 1.9703E-02 |
| S5 | -2.0777E-02 | -2.7884E-02 | 5.9861E-02 | -1.1106E-01 | 1.2356E-01 | -8.5858E-02 |
| S6 | -6.5816E-03 | -4.2435E-02 | 6.7828E-02 | -1.0726E-01 | 1.0918E-01 | -6.9478E-02 |
| S7 | -1.0604E-02 | -1.9616E-02 | 9.8989E-03 | -3.5013E-03 | -4.3847E-03 | 8.4691E-03 |
| S8 | -2.5227E-02 | 5.2497E-03 | -1.8130E-02 | 1.9016E-02 | -1.2886E-02 | 6.1207E-03 |
| S9 | -4.2761E-02 | 1.9475E-02 | -9.4177E-03 | -2.1142E-03 | 3.9703E-03 | -1.7087E-03 |
| S10 | -7.0500E-02 | 3.0492E-02 | -1.0518E-02 | -1.8018E-05 | 2.1053E-03 | -1.1305E-03 |
| S11 | -3.9524E-02 | 2.1173E-03 | -2.2264E-03 | 1.1119E-03 | -9.3362E-04 | 6.6374E-04 |
| S12 | 1.3653E-02 | -9.5301E-03 | -1.3232E-03 | 2.4591E-03 | -1.4016E-03 | 5.6300E-04 |
| S13 | -2.5051E-02 | 1.5201E-02 | -7.8414E-03 | 2.7717E-03 | -6.1407E-04 | 8.9089E-05 |
| S14 | -3.4466E-02 | 1.2780E-02 | -4.1791E-03 | 9.6481E-04 | -1.5282E-04 | 1.6713E-05 |
TABLE 12-1
| Flour mark | A16 | A18 | A20 | A22 | A24 | A26 |
| S1 | 3.7771E-04 | -6.3889E-05 | 4.4201E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | 1.5570E-03 | -2.8584E-04 | 2.1893E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S3 | 1.9710E-03 | -3.9769E-04 | 3.4162E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S4 | -8.6648E-03 | 2.0760E-03 | -2.0141E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S5 | 3.6012E-02 | -8.1622E-03 | 7.5796E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S6 | 2.7610E-02 | -6.1614E-03 | 5.8000E-04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S7 | -4.7029E-03 | 1.1141E-03 | -9.8545E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S8 | -1.8532E-03 | 3.1372E-04 | -2.2279E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S9 | 3.6910E-04 | -4.2363E-05 | 2.1238E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S10 | 3.0708E-04 | -4.7210E-05 | 3.8655E-06 | -1.2769E-07 | 0.0000E+00 | 0.0000E+00 |
| S11 | -2.5679E-04 | 5.2655E-05 | -5.1088E-06 | 7.2594E-08 | 2.3925E-08 | -1.3025E-09 |
| S12 | -1.5164E-04 | 2.6557E-05 | -2.9922E-06 | 2.0999E-07 | -8.3750E-09 | 1.4526E-10 |
| S13 | -8.7582E-06 | 5.9000E-07 | -2.6898E-08 | 7.9457E-10 | -1.3741E-11 | 1.0569E-13 |
| S14 | -1.2671E-06 | 6.5917E-08 | -2.2824E-09 | 4.9388E-11 | -5.8582E-13 | 2.7185E-15 |
TABLE 12-2
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 6, which represents a 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 group of embodiment 6. Fig. 12C shows a distortion curve of the optical imaging lens group 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 group of embodiment 6, which represents a deviation of different image heights on an imaging surface after light passes through the lens. As can be seen from fig. 12A to 12D, the optical imaging lens group according to embodiment 6 can achieve good imaging quality.
In summary, examples 1 to 6 each satisfy the relationship shown in table 13.
| Conditions/examples | 1 | 2 | 3 | 4 | 5 | 6 |
| TTL/ImgH | 1.30 | 1.30 | 1.30 | 1.30 | 1.30 | 1.30 |
| f2/f5 | 0.78 | 0.75 | 0.78 | 0.93 | 1.21 | 0.90 |
| f1/f | 0.83 | 0.81 | 0.80 | 0.80 | 0.76 | 0.77 |
| (T45+T56)/T67 | 0.55 | 0.49 | 0.43 | 0.43 | 0.32 | 0.40 |
| f×tan(Semi-FOV)/f56 | 0.57 | 0.61 | 0.56 | 0.57 | 0.54 | 0.54 |
| f6/f1234 | 0.94 | 0.93 | 0.97 | 0.93 | 0.79 | 0.89 |
| SAG62/SAG72 | 0.56 | 0.59 | 0.48 | 0.51 | 0.50 | 0.48 |
| SAG52/SAG11 | -0.86 | -0.73 | -0.85 | -0.81 | -0.89 | -0.82 |
| ET2/ET6 | 0.75 | 1.12 | 0.91 | 0.87 | 0.89 | 0.82 |
| R4/f | 0.88 | 0.96 | 0.96 | 0.97 | 0.98 | 1.25 |
| f7/(R13+R14) | -0.39 | -0.71 | -0.70 | -0.74 | -0.73 | -0.70 |
| (R2-R1)/(R1+R2) | 0.59 | 0.63 | 0.64 | 0.64 | 0.69 | 0.67 |
| (R8-R9)/(R8+R9) | 0.73 | 0.34 | 0.33 | 0.34 | 0.48 | 0.34 |
| R12/R11 | -0.71 | -0.58 | -0.55 | -0.67 | -0.79 | -0.96 |
| (CT3+CT4+CT5)/(CT1+CT2) | 0.87 | 0.76 | 0.81 | 0.79 | 0.79 | 0.82 |
Watch 13
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 group described above.
The above description is only a preferred embodiment 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 the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned 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 (34)
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 an optical power;
a third lens having optical power;
a fourth lens having an optical power;
a fifth lens element having a negative refractive power, the object-side surface of which is concave;
a sixth lens having a refractive power, an image-side surface of which is convex; and
a seventh lens having optical power;
the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group satisfies: ImgH > 5.5 mm;
the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group satisfy that: TTL/ImgH is less than 1.35.
2. The optical imaging lens group of claim 1 wherein the total effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group satisfy: f/EPD < 1.9.
3. The optical imaging lens group of claim 1, wherein the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: f2/f5 is more than 0.7 and less than 1.7.
4. The optical imaging lens group of claim 1, wherein a separation distance T45 on the optical axis of the fourth lens and the fifth lens, a separation distance T56 on the optical axis of the fifth lens and the sixth lens, and a separation distance T67 on the optical axis of the sixth lens and the seventh lens satisfy: 0.2 < (T45+ T56)/T67 < 0.7.
5. The optical imaging lens group of claim 1 wherein the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens group satisfy: f1/f is more than 0.5 and less than 1.0.
6. The optical imaging lens group of claim 1 wherein the total effective focal length f of the optical imaging lens group, half of the Semi-FOV of the maximum field angle of the optical imaging lens group, and the combined focal length f56 of the fifth and sixth lenses satisfy: 0.3 < f × tan (Semi-FOV)/f56 < 0.8.
7. The optical imaging lens group of claim 1, wherein an effective focal length f6 of the sixth lens and a combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens satisfy: 0.5 < f6/f1234 < 1.0.
8. The optical imaging lens group of claim 1, wherein a distance SAG62 on the optical axis from an intersection point 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 to a distance SAG72 on the optical axis from an intersection point of an image-side surface of the seventh lens and the optical axis to an effective radius vertex of the image-side surface of the seventh lens satisfies: 0.3 < SAG62/SAG72 < 0.8.
9. The optical imaging lens group of claim 1, wherein a distance SAG11 on the optical axis from an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of an object-side surface of the first lens to a distance SAG52 on the optical axis from an intersection point of an image-side surface of the fifth lens and the optical axis to an effective radius vertex of an image-side surface of the fifth lens satisfies: -1.0 < SAG52/SAG11 < -0.5.
10. The optical imaging lens group of claim 1, wherein the edge thickness ET2 of the second lens and the edge thickness ET6 of the sixth lens satisfy: 0.5 < ET2/ET6 < 1.5.
11. The optical imaging lens group of claim 1 wherein the second lens has a negative optical power with a concave image-side surface, and
the curvature radius R4 of the image side surface of the second lens and the total effective focal length f of the optical imaging lens group meet the following conditions: r4/f is more than 0.5 and less than 1.5.
12. The optical imaging lens group of claim 1 wherein the seventh lens element has a negative optical power and has a concave object-side surface and a concave image-side surface, and
a radius of curvature R13 of an object-side surface of the seventh lens, a radius of curvature R14 of an image-side surface of the seventh lens, and an effective focal length f7 of the seventh lens satisfy: -1.0 < f7/(R13+ R14) < 0.
13. The optical imaging lens group of claim 1 wherein the first lens element has positive optical power with a convex object-side surface and a concave image-side surface, and
a radius of curvature R1 of an object-side surface of the first lens and a radius of curvature R2 of an image-side surface of the first lens satisfy: 0.5 < (R2-R1)/(R1+ R2) < 1.0.
14. The optical imaging lens group of claim 1, wherein the radius of curvature R8 of the image-side surface of the fourth lens and the radius of curvature R9 of the object-side surface of the fifth lens satisfy: 0.2 < (R8-R9)/(R8+ R9) < 1.2.
15. The optical imaging lens group of claim 1 wherein the sixth lens element has positive optical power and a convex object-side surface, and
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: -1.3 < R12/R11 < -0.3.
16. The optical imaging lens group of claim 1, wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy: 0.5 < (CT3+ CT4+ CT5)/(CT1+ CT2) < 1.0.
17. The optical imaging lens group of any one of claims 1-16, wherein the image side surface of the fourth lens is convex.
18. 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 an optical power;
a third lens having optical power;
a fourth lens having an optical power;
a fifth lens element having a negative refractive power, the object-side surface of which is concave;
a sixth lens having a refractive power, an image-side surface of which is convex; and
a seventh lens having optical power;
a total effective focal length f of the optical imaging lens group, a half Semi-FOV of a maximum field angle of the optical imaging lens group, and a combined focal length f56 of the fifth lens and the sixth lens satisfy: 0.3 < f × tan (Semi-FOV)/f56 < 0.8;
the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group satisfy that: TTL/ImgH is less than 1.35.
19. The optical imaging lens group of claim 18,
the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, and the image side surface of the second lens is a concave surface;
the image side surface of the fourth lens is a convex surface;
the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface;
the seventh lens element has a negative focal power, and has a concave object-side surface and a concave image-side surface.
20. The optical imaging lens group of claim 18 wherein the total effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group satisfy: f/EPD < 1.9.
21. The optical imaging lens group of claim 18 wherein the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy: f2/f5 is more than 0.7 and less than 1.7.
22. The optical imaging lens group of claim 18 wherein a separation distance T45 on the optical axis of the fourth lens and the fifth lens, a separation distance T56 on the optical axis of the fifth lens and the sixth lens, and a separation distance T67 on the optical axis of the sixth lens and the seventh lens satisfy: 0.2 < (T45+ T56)/T67 < 0.7.
23. The optical imaging lens group of claim 18 wherein the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens group satisfy: f1/f is more than 0.5 and less than 1.0.
24. The optical imaging lens group of claim 18, wherein ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group, satisfies: ImgH > 5.5 mm.
25. The optical imaging lens group of claim 18, wherein an effective focal length f6 of the sixth lens and a combined focal length f1234 of the first, second, third and fourth lenses satisfy: 0.5 < f6/f1234 < 1.0.
26. The optical imaging lens group of claim 18, wherein a distance SAG62 on the optical axis from an intersection point 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 to a distance SAG72 on the optical axis from an intersection point of the image-side surface of the seventh lens and the optical axis to an effective radius vertex of the image-side surface of the seventh lens satisfies: 0.3 < SAG62/SAG72 < 0.8.
27. The optical imaging lens group of claim 18 wherein a distance SAG11 on the optical axis from an intersection point of an 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 to a distance SAG52 on the optical axis from an intersection point 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 satisfies: -1.0 < SAG52/SAG11 < -0.5.
28. The optical imaging lens group of claim 18 wherein the edge thickness ET2 of the second lens and the edge thickness ET6 of the sixth lens satisfy: 0.5 < ET2/ET6 < 1.5.
29. The optical imaging lens group of claim 18 wherein the radius of curvature R4 of the image side surface of the second lens and the total effective focal length f of the optical imaging lens group satisfy: r4/f is more than 0.5 and less than 1.5.
30. The optical imaging lens group of claim 18, wherein the radius of curvature of the object-side surface of the seventh lens, R13, the radius of curvature of the image-side surface of the seventh lens, R14, and the effective focal length f7 of the seventh lens satisfy: -1.0 < f7/(R13+ R14) < 0.
31. The optical imaging lens group of claim 18 wherein the radius of curvature of the object-side surface of the first lens, R1, and the radius of curvature of the image-side surface of the first lens, R2, satisfy: 0.5 < (R2-R1)/(R1+ R2) < 1.0.
32. The optical imaging lens group of claim 18 wherein the radius of curvature R8 of the image-side surface of the fourth lens and the radius of curvature R9 of the object-side surface of the fifth lens satisfy: 0.2 < (R8-R9)/(R8+ R9) < 1.2.
33. The optical imaging lens group of claim 18 wherein the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: -1.3 < R12/R11 < -0.3.
34. The optical imaging lens group of claim 18 wherein the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.5 < (CT3+ CT4+ CT5)/(CT1+ CT2) < 1.0.
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