CN211043777U - Optical imaging lens group - Google Patents
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- CN211043777U CN211043777U CN201921628342.2U CN201921628342U CN211043777U CN 211043777 U CN211043777 U CN 211043777U CN 201921628342 U CN201921628342 U CN 201921628342U CN 211043777 U CN211043777 U CN 211043777U
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Abstract
The application discloses an optical imaging lens group, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the first lens has positive focal power, the object side surface of the first lens is convex, the image side surface of the first lens is concave, the total effective focal length f of the optical imaging lens group and the maximum half field angle Semi-FOV of the optical imaging lens group meet f × tan (Semi-FOV) > 7.5mm, and the distance TT L 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 line length of an effective pixel area on the imaging surface of the optical imaging lens group meet L/ImgH < 1.3.
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, people have higher and higher requirements for the imaging quality of portable electronic products such as mobile phones and tablet computers. Meanwhile, with the continuous development of common photosensitive device technologies such as a photosensitive coupling device (CCD) and a Complementary Metal Oxide Semiconductor (CMOS), the corresponding imaging lens also meets the requirement of high imaging quality. On the other hand, with the trend of light and thin portable electronic products such as smart phones and tablet computers, more stringent requirements are put on the miniaturization of optical imaging lens sets used in cooperation.
How to satisfy the characteristics of ultra-large image plane, high imaging quality and ultra-short total length is one of the problems to be solved urgently in the field of lens design.
SUMMERY OF THE UTILITY MODEL
The application provides an optical imaging lens group which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the total effective focal length f of the optical imaging lens group and the maximum half field angle Semi-FOV of the optical imaging lens group can satisfy f × tan (Semi-FOV) > 7.5 mm.
In one embodiment, a distance TT L from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis and a half of a diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group satisfy TT L/ImgH < 1.3.
In one embodiment, the maximum effective radius DT51 of the object-side surface of the fifth lens and the maximum effective radius DT71 of the object-side surface of the seventh lens may satisfy: 0.3 < DT51/DT71 < 0.8.
In one embodiment, the total effective focal length f of the optical imaging lens group and the effective focal length f1 of the first lens can satisfy: f1/f is more than 0.5 and less than 1.0.
In one embodiment, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens may satisfy: -1.0 < f7/f6 < 0.
In one embodiment, the total effective focal length f of the optical imaging lens group, 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 may satisfy: f/(R2-R1) is more than 0.5 and less than 1.5.
In one embodiment, the effective focal length f2 of the second lens, the radius of curvature R3 of the object-side surface of the second lens, and the radius of curvature R4 of the image-side surface of the second lens may satisfy: 0.5 < (R4-R3)/f2 < 1.5.
In one embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R6 of the image-side surface of the third lens may satisfy: 0.5 < R5/R6 < 1.5.
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: 0.3 < R9/R8 < 1.3.
In one embodiment, the radius of curvature R11 of the object-side surface of the sixth lens and the effective focal length f6 of the sixth lens may satisfy: r11/f6 is more than 0.5 and less than 1.0.
In one embodiment, the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens may satisfy: -1.0 < R13/R14 < 0.
In one embodiment, 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, and the central thickness CT4 of the fourth lens on the optical axis may satisfy: 0.7 < CT1/(CT2+ CT3+ CT4) < 1.2.
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, and a separation distance T34 on the optical axis of the third lens and the fourth lens may satisfy: 0.5 < T23/(T12+ T34) < 1.
In one embodiment, a central thickness CT5 of the fifth lens on the optical axis, a central thickness CT6 of the sixth lens on the optical axis, a separation distance T56 of the fifth lens and the sixth lens on the optical axis, and a separation distance T67 of the sixth lens and the seventh lens on the optical axis may satisfy: 0.5 < (CT5+ CT6)/(T56+ T67) < 1.0.
In one embodiment, a distance SAG61 on the optical axis from the intersection point of the object-side surface of the sixth lens and the optical axis to the effective radius vertex of the object-side surface of the sixth lens and 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 may satisfy: 0.5 < SAG61/SAG62 < 1.0.
In one embodiment, a distance SAG71 on the optical axis from the intersection point of the object-side surface of the seventh lens and the optical axis to the effective radius vertex of the object-side surface of the seventh 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: 0.7 < SAG71/SAG72 < 1.2.
In one embodiment, the first lens element can have a positive optical power, and the object-side surface can be convex and the image-side surface can be concave.
In one embodiment, the second lens element can have a negative optical power, and the object-side surface can be convex and the image-side surface can be concave.
In one embodiment, the object-side surface of the third lens element can be convex and the image-side surface can be concave.
In one embodiment, the fourth lens may have a negative optical power, and the image-side surface thereof may be concave.
In one embodiment, the object side surface of the fifth lens may be convex.
In one embodiment, the sixth lens may have a positive optical power and the object side surface thereof may be convex.
In one embodiment, the seventh lens element can have a negative optical power, and the object side surface can be concave and the image side surface can be concave.
The optical imaging lens group has at least one beneficial effect of large image surface, short optical total length, high imaging quality and the like by adopting seven lenses and reasonably distributing focal power, surface type, center thickness of each lens, axial distance between each lens and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 shows a schematic structural view of an optical imaging lens 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;
fig. 12A to 12D 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 6;
fig. 13 is a schematic view showing a structure of an optical imaging lens group according to embodiment 7 of the present application;
fig. 14A to 14D 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 7.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for 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 optical power, and the object side surface may be convex and the image side surface may be concave.
In an exemplary embodiment, the second lens may have a negative power, and the object side surface may be convex and the image side surface may be concave.
In an exemplary embodiment, the third lens has a positive or negative power, and the object-side surface may be convex and the image-side surface may be concave.
In an exemplary embodiment, the fourth lens may have a negative optical power, and the image-side surface thereof may be concave.
In an exemplary embodiment, the fifth lens has a positive or negative power, and the object-side surface thereof may be convex.
In an exemplary embodiment, the sixth lens may have a positive optical power, and the object-side surface thereof may be convex.
In an exemplary embodiment, the seventh lens may have a negative optical power, and both the object-side surface and the image-side surface thereof may be concave.
The focal power and the surface type of the first lens and the second lens are reasonably controlled, so that the aberration of a field of view on the axis of the optical imaging lens group is favorably reduced, and the axis of the optical imaging lens group has good imaging performance. By controlling the focal power of the third lens, the fourth lens and the fifth lens, the surface type of the object-side surface and the image-side surface of the third lens, the surface type of the image-side surface of the fourth lens and the surface type of the object-side surface of the fifth lens, the high-order aberration generated by the lenses can be balanced, so that each field of view of the optical imaging lens group has smaller aberration. By controlling the focal power of the sixth lens and the seventh lens and the surface type of the object side surface of the sixth lens and the surface type of the object side surface and the image side surface of the seventh lens, the matching of the chief ray and the image surface of the optical imaging lens group is facilitated. The first lens to the seventh lens are reasonably matched, so that the incident angle of the chief ray of the imaging system to the image plane can be reduced while the ultrathin and large image plane is ensured, and the relative illumination of the image plane is improved.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy f × tan (Semi-FOV) > 7.5mm, where f is a total effective focal length of the optical imaging lens group and the Semi-FOV is a maximum half field angle of the optical imaging lens group, more specifically, f and the Semi-FOV may further satisfy f × tan (Semi-FOV) > 7.7mm, f × tan (Semi-FOV) > 7.5mm, which is advantageous for satisfying characteristics of an oversized imaging surface of the optical imaging lens group while achieving ultra-thin characteristics of the optical imaging lens group.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy TT L/ImgH < 1.3, where TT L is a distance on an optical axis from an object side surface of a first lens to an imaging surface of the optical imaging lens group, and ImgH is a half of a diagonal length of an effective pixel region on the imaging surface of the optical imaging lens group, and TT L/ImgH < 1.3 may effectively restrict a volume of an optical system, satisfying a characteristic of an ultra-large imaging surface while the optical imaging lens group has an ultra-thin characteristic.
In an exemplary embodiment, Imgh, which is half the diagonal length of an effective pixel area on an imaging surface of an optical imaging lens group, may satisfy Imgh ≧ 7.5 mm. The ImgH is more than or equal to 7.5mm, and the large imaging surface characteristic can be realized.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3 < DT51/DT71 < 0.8, where DT51 is the maximum effective radius of the object-side surface of the fifth lens and DT71 is the maximum effective radius of the object-side surface of the seventh lens. More specifically, DT51 and DT71 further satisfy: 0.35 < DT51/DT71 < 0.75. The size of the rear end of the optical imaging lens group can be reduced, light with poor imaging quality is eliminated on the premise of ensuring the marginal field illumination of the optical imaging lens group, and excellent imaging quality is further ensured.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < f1/f < 1.0, where f is the total effective focal length of the optical imaging lens group, and f1 is the effective focal length of the first lens. More specifically, f1 and f further satisfy: f1/f is more than 0.6 and less than 0.9. The requirement that f1/f is more than 0.5 and less than 1.0 is met, the protruding height of the object side surface of the first lens can be effectively controlled, sufficient light is ensured to be incident into the optical imaging lens group, and sufficient brightness of imaging is ensured.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: -1.0 < f7/f6 < 0, wherein f6 is the effective focal length of the sixth lens and f7 is the effective focal length of the seventh lens. More specifically, f7 and f6 may further satisfy: -0.8 < f7/f6 < -0.4. The requirements that f7/f6 is more than-1.0 and less than 0 are met, the optical sensitivities of the seventh lens and the sixth lens can be effectively reduced, and the mass production is favorably realized.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < f/(R2-R1) < 1.5, where f is a total effective focal length of the optical imaging lens group, R1 is a radius of curvature of an object-side surface of the first lens, and R2 is a radius of curvature of an image-side surface of the first lens. More specifically, f, R2, and R1 may further satisfy: f/(R2-R1) is more than 0.8 and less than 1.0. The optical imaging lens group meets the condition that f/(R2-R1) is more than 0.5 and less than 1.5, can converge the light incident from the object side of the first lens, and ensures that the light with enough angle is incident into the optical imaging lens group.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < (R4-R3)/f2 < 1.5, wherein f2 is the effective focal length of the second lens, R3 is the radius of curvature of the object-side surface of the second lens, and R4 is the radius of curvature of the image-side surface of the second lens. More specifically, R4, R3, and f2 may further satisfy: 0.6 < (R4-R3)/f2 < 1.0. Satisfies 0.5 < (R4-R3)/f2 < 1.5, can disperse light collected by the lens with positive focal power, has the function of balancing the spherical aberration of the optical imaging lens group, and further ensures that the spherical aberration of the whole optical imaging lens group is small.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < R5/R6 < 1.5, wherein R5 is a radius of curvature of an object-side surface of the third lens, and R6 is a radius of curvature of an image-side surface of the third lens. More specifically, R5 and R6 may further satisfy: 0.6 < R5/R6 < 1.3. Satisfying 0.5 < R5/R6 < 1.5, the focal power of the optical imaging lens group can be reasonably distributed, so that the positive and negative spherical aberration of the front group lens and the rear group lens can be mutually offset.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.3 < R9/R8 < 1.3, 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: 0.4 < R9/R8 < 0.9. Satisfying 0.3 < R9/R8 < 1.3, the on-axis aberration of the optical imaging lens group can be effectively balanced.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < R11/f6 < 1.0, wherein R11 is a radius of curvature of an object side surface of the sixth lens, and f6 is an effective focal length of the sixth lens. More specifically, R11 and f6 may further satisfy: r11/f6 is more than 0.5 and less than 0.7. The optical sensitivity of the sixth lens can be effectively reduced and the mass production can be realized favorably when R11/f6 is more than 0.5 and less than 1.0.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: -1.0 < R13/R14 < 0, wherein R13 is the radius of curvature of the object-side surface of the seventh lens and R14 is the radius of curvature of the image-side surface of the seventh lens. More specifically, R13 and R14 may further satisfy: -0.5 < R13/R14 < -0.2. The optical imaging lens group satisfies the condition that R13/R14 is more than-1.0 and less than 0, and is favorable for ensuring that the seventh lens has proper focal power, so that light rays are reasonably distributed on an imaging surface, and the characteristic of an ultra-large image surface of the optical imaging lens group is further realized.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.7 < CT1/(CT2+ CT3+ CT4) < 1.2, where CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, CT3 is the central thickness of the third lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis. More specifically, CT1, CT2, CT3, and CT4 may further satisfy: 0.8 < CT1/(CT2+ CT3+ CT4) < 1.0. The requirements of 0.7 < CT1/(CT2+ CT3+ CT4) < 1.2 are met, the assembly process of the optical imaging lens group can be favorably ensured, the ultrathin characteristic of the optical imaging lens group is realized, and the requirement of the whole machine is favorably met.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < T23/(T12+ T34) < 1, 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, and T34 is a separation distance of the third lens and the fourth lens on the optical axis. More specifically, T23, T12, and T34 may further satisfy: 0.5 < T23/(T12+ T34) < 0.85. The requirements that T23/(T12+ T34) is more than 0.5 and less than 1 are met, the sensitivity of air intervals in the optical imaging lens group can be reduced, the optical imaging lens group is ensured to have better imaging quality, and the mass production is favorably realized.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 < (CT5+ CT6)/(T56+ T67) < 1.0, wherein CT5 is a central thickness of the fifth lens on the optical axis, CT6 is a central thickness of the sixth lens on the optical axis, T56 is a separation distance of the fifth lens and the sixth lens on the optical axis, and T67 is a separation distance of the sixth lens and the seventh lens on the optical axis. More specifically, CT5, CT6, T56 and T67 may further satisfy: 0.5 < (CT5+ CT6)/(T56+ T67) < 0.8. Satisfy 0.5 < (CT5+ CT6)/(T56+ T67) < 1.0, both can improve the stability of optical imaging lens group equipment, can improve optical imaging lens group injection moulding's stability again, and then improve optical imaging lens group's production yield.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.5 & lt SAG61/SAG62 & lt 1.0, wherein SAG61 is a distance on the optical axis from the intersection point of the object side surface of the sixth lens and the optical axis to the effective radius vertex of the object side surface of the sixth lens, and 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. More specifically, SAG61 and SAG62 further may satisfy: 0.6 < SAG61/SAG62 < 0.8. The condition that 0.5 & lt SAG61/SAG62 & lt 1.0 is met, the incident angle of the chief ray on the image side surface of the sixth lens can be effectively reduced, and the matching degree of the optical imaging lens group and the chip is improved.
In an exemplary embodiment, an optical imaging lens group according to the present application may satisfy: 0.7 < SAG71/SAG72 < 1.2, wherein SAG71 is a distance on the optical axis from the intersection point of the object side surface of the seventh lens and the optical axis to the effective radius vertex of the object side surface of the seventh 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, SAG71 and SAG72 further may satisfy: 0.8 < SAG71/SAG72 < 1.0. The requirement of 0.7 < SAG71/SAG72 < 1.2 is favorable for higher relative illumination when the chief ray of the optical imaging lens group is incident on the imaging surface at a smaller incident angle, and simultaneously the seventh lens has better processability.
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 with the configuration can ensure a large image surface and simultaneously realize the characteristics of ultra-short system total length, 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 convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a convex 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 9.03mm, the total length TT L 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 9.99mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens group is 8.00mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 41.3 °, and the ratio f/EPD of the total effective focal length f to the entrance pupil diameter EPD is 2.00.
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. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S14 used in example 14、A6、A8、A10、A12、A14、A16、A18And A20。
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 2.0445E-02 | -2.7991E-03 | 7.8046E-04 | -1.7870E-04 | 2.2991E-05 | 3.0187E-06 | -1.9911E-06 | 3.4221E-07 | -2.2723E-08 |
| S2 | -2.4528E-03 | 1.3154E-03 | -1.4571E-03 | 1.1729E-03 | -6.0681E-04 | 1.9447E-04 | -3.7494E-05 | 3.9805E-06 | -1.8011E-07 |
| S3 | -1.4922E-03 | 1.6743E-03 | -5.3352E-04 | 3.5773E-04 | -2.0569E-04 | 8.0921E-05 | -1.8640E-05 | 2.3145E-06 | -1.1978E-07 |
| S4 | 1.4728E-04 | 2.7439E-03 | -1.7494E-03 | 1.5709E-03 | -8.6881E-04 | 3.0107E-04 | -5.7943E-05 | 5.3342E-06 | -1.1210E-07 |
| S5 | -7.9509E-03 | 1.2422E-03 | -2.3718E-03 | 2.5091E-03 | -1.7370E-03 | 7.6294E-04 | -2.0676E-04 | 3.1775E-05 | -2.1418E-06 |
| S6 | -7.6853E-03 | 4.1802E-04 | 2.4856E-04 | -9.3698E-04 | 7.8995E-04 | -3.4700E-04 | 8.2256E-05 | -9.6940E-06 | 3.9501E-07 |
| S7 | -1.9923E-02 | 3.4320E-03 | -5.2139E-03 | 4.7863E-03 | -3.0295E-03 | 1.2379E-03 | -3.1296E-04 | 4.4357E-05 | -2.6868E-06 |
| S8 | -2.0710E-02 | 5.5262E-03 | -4.8233E-03 | 2.9196E-03 | -1.2406E-03 | 3.5227E-04 | -6.2947E-05 | 6.4022E-06 | -2.7838E-07 |
| S9 | -1.8236E-02 | 5.1634E-03 | -1.4809E-03 | 2.6597E-04 | -3.6778E-05 | 4.4147E-06 | -4.7190E-07 | 3.7399E-08 | -1.3843E-09 |
| S10 | -2.0661E-02 | 5.2106E-03 | -1.0365E-03 | 1.4379E-04 | -1.4081E-05 | 9.8566E-07 | -4.9622E-08 | 1.8284E-09 | -3.9572E-11 |
| S11 | -1.1112E-02 | 4.0636E-04 | -3.7982E-05 | 1.9256E-05 | -5.9044E-06 | 7.8618E-07 | -5.4900E-08 | 2.0704E-09 | -3.3732E-11 |
| S12 | -2.4410E-04 | -1.2428E-03 | 1.8995E-04 | -2.4769E-06 | -3.0430E-06 | 4.1541E-07 | -2.4588E-08 | 7.0386E-10 | -7.9547E-12 |
| S13 | -1.9194E-02 | 3.0113E-03 | -2.2928E-04 | 1.0973E-05 | -3.4911E-07 | 7.3559E-09 | -9.7910E-11 | 7.3605E-13 | -2.3362E-15 |
| S14 | -1.1884E-02 | 1.5255E-03 | -1.1522E-04 | 5.2411E-06 | -1.4029E-07 | 1.7532E-09 | 5.5105E-12 | -3.9265E-13 | 2.9892E-15 |
TABLE 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 positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a convex 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 8.90mm, the total length TT L of the optical imaging lens group is 9.99mm, half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens group is 7.82mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 41.5 °, and the ratio f/EPD of the total effective focal length f to the entrance pupil diameter EPD is 1.97.
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). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 3
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 2.0151E-02 | -2.4368E-03 | 3.2754E-04 | 1.4688E-04 | -1.2170E-04 | 4.3072E-05 | -8.7110E-06 | 9.6706E-07 | -4.7169E-08 |
| S2 | -2.2541E-03 | 1.1258E-03 | -1.1580E-03 | 9.1949E-04 | -4.8095E-04 | 1.5632E-04 | -3.0522E-05 | 3.2740E-06 | -1.4946E-07 |
| S3 | -1.2804E-03 | 1.9246E-03 | -7.6088E-04 | 4.8822E-04 | -2.6038E-04 | 9.6815E-05 | -2.1669E-05 | 2.6443E-06 | -1.3507E-07 |
| S4 | 5.4741E-04 | 1.9604E-03 | -1.1400E-05 | -4.3763E-04 | 5.0259E-04 | -2.7580E-04 | 8.8424E-05 | -1.5261E-05 | 1.1169E-06 |
| S5 | -7.7701E-03 | 1.1283E-03 | -1.4391E-03 | 1.2171E-03 | -7.5490E-04 | 3.1218E-04 | -8.2396E-05 | 1.2662E-05 | -8.7740E-07 |
| S6 | -8.2950E-03 | 2.2260E-03 | -2.5705E-03 | 1.9914E-03 | -1.1099E-03 | 4.1352E-04 | -1.0016E-04 | 1.4225E-05 | -9.1582E-07 |
| S7 | -2.1049E-02 | 5.4161E-03 | -7.0806E-03 | 5.9933E-03 | -3.5163E-03 | 1.3472E-03 | -3.2198E-04 | 4.3360E-05 | -2.5040E-06 |
| S8 | -2.1278E-02 | 6.2808E-03 | -5.3236E-03 | 3.1967E-03 | -1.3557E-03 | 3.8448E-04 | -6.8688E-05 | 6.9808E-06 | -3.0353E-07 |
| S9 | -1.7942E-02 | 4.7858E-03 | -1.2327E-03 | 1.7897E-04 | -1.5936E-05 | 9.3918E-07 | -1.0664E-07 | 1.6069E-08 | -8.5945E-10 |
| S10 | -1.9734E-02 | 4.5946E-03 | -8.1488E-04 | 9.4365E-05 | -6.6270E-06 | 2.0055E-07 | 5.2299E-09 | -4.5261E-10 | 3.7608E-12 |
| S11 | -9.8796E-03 | 1.9869E-04 | 4.9115E-05 | -4.4360E-06 | -1.3282E-06 | 2.4383E-07 | -1.7482E-08 | 6.4811E-10 | -1.0395E-11 |
| S12 | 1.1100E-03 | -1.4339E-03 | 2.4392E-04 | -1.5229E-05 | -8.3553E-07 | 1.8437E-07 | -1.1176E-08 | 3.0505E-10 | -3.2068E-12 |
| S13 | -1.8685E-02 | 2.8785E-03 | -2.1523E-04 | 1.0137E-05 | -3.1993E-07 | 6.7816E-09 | -9.2749E-11 | 7.3934E-13 | -2.6085E-15 |
| S14 | -1.1512E-02 | 1.5148E-03 | -1.1736E-04 | 5.5688E-06 | -1.6419E-07 | 2.8137E-09 | -2.2432E-11 | -1.7119E-15 | 7.8482E-16 |
TABLE 4
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 negative power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a convex 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 concave 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 8.90mm, the total length TT L of the optical imaging lens group is 9.99mm, half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens group is 8.00mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 41.5 °, and the ratio f/EPD of the total effective focal length f to the entrance pupil diameter EPD is 2.00.
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). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 5
TABLE 6
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 positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a convex 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 concave 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 8.90mm, the total length TT L of the optical imaging lens group is 9.99mm, half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens group is 8.00mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 41.5 °, and the ratio f/EPD of the total effective focal length f to the entrance pupil diameter EPD is 1.97.
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). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 7
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 2.0053E-02 | -2.4745E-03 | 3.3756E-04 | 1.6491E-04 | -1.4277E-04 | 5.2908E-05 | -1.1113E-05 | 1.2720E-06 | -6.2952E-08 |
| S2 | -1.5625E-03 | 8.9377E-04 | -1.1400E-03 | 9.4728E-04 | -5.0017E-04 | 1.6361E-04 | -3.2204E-05 | 3.4885E-06 | -1.6104E-07 |
| S3 | -4.9092E-05 | 1.2732E-03 | -3.8304E-04 | 2.7355E-04 | -1.6038E-04 | 6.6193E-05 | -1.6098E-05 | 2.0933E-06 | -1.1234E-07 |
| S4 | 1.0919E-03 | 1.8973E-03 | -5.4566E-04 | 2.6030E-04 | 3.8661E-05 | -9.1217E-05 | 4.4996E-05 | -9.8007E-06 | 8.3863E-07 |
| S5 | -6.7182E-03 | 3.0570E-04 | -2.7803E-04 | -1.3557E-06 | 9.9188E-05 | -7.0109E-05 | 2.2647E-05 | -3.5112E-06 | 1.8961E-07 |
| S6 | -7.1787E-03 | 1.4876E-03 | -1.6881E-03 | 1.2410E-03 | -6.5984E-04 | 2.3240E-04 | -5.3934E-05 | 7.4589E-06 | -4.8556E-07 |
| S7 | -1.9667E-02 | 2.3770E-03 | -3.1376E-03 | 2.5338E-03 | -1.5075E-03 | 5.9719E-04 | -1.4925E-04 | 2.1078E-05 | -1.2745E-06 |
| S8 | -1.9543E-02 | 4.6327E-03 | -4.3288E-03 | 2.7936E-03 | -1.2443E-03 | 3.6584E-04 | -6.7167E-05 | 6.9784E-06 | -3.0937E-07 |
| S9 | -1.5943E-02 | 4.3402E-03 | -1.0753E-03 | 1.1081E-04 | 8.7145E-06 | -4.5804E-06 | 6.3284E-07 | -3.9120E-08 | 9.0141E-10 |
| S10 | -1.8587E-02 | 4.4498E-03 | -7.8826E-04 | 8.3383E-05 | -3.7865E-06 | -2.1983E-07 | 4.1641E-08 | -2.2095E-09 | 4.0889E-11 |
| S11 | -9.7947E-03 | 3.6942E-04 | 8.6053E-05 | -2.6269E-05 | 3.1328E-06 | -2.5312E-07 | 1.4289E-08 | -4.5993E-10 | 6.0651E-12 |
| S12 | 1.4050E-03 | -1.7124E-03 | 3.6964E-04 | -4.2906E-05 | 2.6797E-06 | -8.7334E-08 | 1.2868E-09 | -4.6010E-12 | -7.5235E-15 |
| S13 | -2.0301E-02 | 3.1485E-03 | -2.3826E-04 | 1.1172E-05 | -3.4316E-07 | 6.9053E-09 | -8.7262E-11 | 6.2324E-13 | -1.8970E-15 |
| S14 | -1.1502E-02 | 1.4227E-03 | -9.4639E-05 | 3.1710E-06 | -2.4818E-08 | -1.9478E-09 | 7.2613E-11 | -1.0264E-12 | 5.3913E-15 |
TABLE 8
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 negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a convex 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 9.03mm, the total length TT L of the optical imaging lens group is 9.99mm, half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens group is 8.00mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 41.3 °, and the ratio f/EPD of the total effective focal length f to the entrance pupil diameter EPD is 2.00.
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). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 9
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 2.0323E-02 | -2.4556E-03 | 4.3782E-04 | 2.1149E-05 | -4.2306E-05 | 1.3677E-05 | -2.3565E-06 | 2.2092E-07 | -1.0646E-08 |
| S2 | -2.9439E-03 | 1.2174E-03 | -8.1748E-04 | 6.4385E-04 | -3.6937E-04 | 1.3044E-04 | -2.7183E-05 | 3.0640E-06 | -1.4504E-07 |
| S3 | -8.2396E-04 | 1.8261E-03 | 2.1431E-04 | -4.9089E-04 | 2.6918E-04 | -7.5962E-05 | 1.2247E-05 | -1.0340E-06 | 3.4940E-08 |
| S4 | 1.5788E-03 | 2.3672E-03 | -6.3293E-04 | 5.4402E-04 | -3.8287E-04 | 1.8169E-04 | -4.7099E-05 | 6.1925E-06 | -2.9019E-07 |
| S5 | -6.6647E-03 | -2.5794E-03 | 6.5325E-03 | -7.3403E-03 | 5.0059E-03 | -2.1185E-03 | 5.4252E-04 | -7.6905E-05 | 4.6313E-06 |
| S6 | -8.9582E-03 | 1.4634E-03 | -5.6025E-04 | 5.3220E-05 | 1.0892E-04 | -7.5008E-05 | 1.9719E-05 | -2.2334E-06 | 5.6593E-08 |
| S7 | -1.8814E-02 | 3.9019E-03 | -5.8455E-03 | 5.1082E-03 | -3.0697E-03 | 1.1994E-03 | -2.9121E-04 | 3.9687E-05 | -2.3103E-06 |
| S8 | -1.9984E-02 | 5.7682E-03 | -5.5329E-03 | 3.5248E-03 | -1.5737E-03 | 4.6862E-04 | -8.7655E-05 | 9.2931E-06 | -4.1974E-07 |
| S9 | -1.8821E-02 | 5.2325E-03 | -1.2860E-03 | 1.4182E-04 | 6.8341E-06 | -4.8725E-06 | 7.4050E-07 | -5.1477E-08 | 1.3734E-09 |
| S10 | -2.0392E-02 | 5.2264E-03 | -1.0074E-03 | 1.2951E-04 | -1.0737E-05 | 5.4520E-07 | -1.3049E-08 | -8.9314E-11 | 7.7952E-12 |
| S11 | -1.0653E-02 | 2.3837E-04 | 1.7628E-04 | -5.2678E-05 | 8.2689E-06 | -9.3173E-07 | 6.7285E-08 | -2.5860E-09 | 3.9673E-11 |
| S12 | -7.4001E-04 | -1.0193E-03 | 2.0576E-04 | -8.9191E-06 | -1.9825E-06 | 2.9006E-07 | -1.6152E-08 | 4.2115E-10 | -4.2543E-12 |
| S13 | -2.0819E-02 | 3.2618E-03 | -2.4274E-04 | 1.0889E-05 | -3.1016E-07 | 5.5552E-09 | -5.8310E-11 | 2.9570E-13 | -3.4635E-16 |
| S14 | -1.1832E-02 | 1.4488E-03 | -9.3527E-05 | 2.7135E-06 | 1.6609E-08 | -3.7835E-09 | 1.1653E-10 | -1.5697E-12 | 8.1117E-15 |
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 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 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 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 9.03mm, the total length TT L of the optical imaging lens group is 10.00mm, half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens group is 8.00mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 41.3 °, and the ratio f/EPD of the total effective focal length f to the entrance pupil diameter EPD is 2.00.
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). Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 11
TABLE 12
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.
Example 7
An optical imaging lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic structural view of an optical imaging lens group according to embodiment 7 of the present application.
As shown in fig. 13, 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 negative power, and has a concave 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 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 9.02mm, the total length TT L of the optical imaging lens group is 10.00mm, half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging lens group is 8.00mm, the maximum half field angle Semi-FOV of the optical imaging lens group is 41.3 °, and the ratio f/EPD of the total effective focal length f to the entrance pupil diameter EPD is 2.00.
Table 13 shows a basic parameter table of the optical imaging lens group of example 7, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 14
Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 7, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 7. Fig. 14C shows a distortion curve of the optical imaging lens group of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 7, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 14A to 14D, the optical imaging lens group according to embodiment 7 can achieve good imaging quality.
In summary, examples 1 to 7 each satisfy the relationship shown in table 15.
| Conditions/examples | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| f×tan(HFOV)(mm) | 7.92 | 7.88 | 7.87 | 7.87 | 7.92 | 7.92 | 7.92 |
| TTL/ImgH | 1.25 | 1.28 | 1.25 | 1.25 | 1.25 | 1.25 | 1.25 |
| DT51/DT71 | 0.47 | 0.47 | 0.49 | 0.68 | 0.47 | 0.48 | 0.49 |
| f1/f | 0.79 | 0.81 | 0.81 | 0.81 | 0.77 | 0.78 | 0.78 |
| f7/f6 | -0.58 | -0.61 | -0.62 | -0.62 | -0.58 | -0.54 | -0.55 |
| f/(R2-R1) | 0.94 | 0.90 | 0.89 | 0.88 | 0.81 | 0.89 | 0.89 |
| (R4-R3)/f2 | 0.63 | 0.66 | 0.65 | 0.68 | 0.79 | 0.92 | 0.92 |
| R5/R6 | 0.70 | 0.72 | 0.71 | 0.71 | 1.17 | 0.73 | 0.74 |
| R9/R8 | 0.58 | 0.82 | 0.53 | 0.59 | 0.78 | 0.70 | 0.43 |
| R11/f6 | 0.62 | 0.63 | 0.53 | 0.53 | 0.64 | 0.57 | 0.56 |
| R13/R14 | -0.37 | -0.42 | -0.39 | -0.38 | -0.38 | -0.39 | -0.39 |
| CT1/(CT2+CT3+CT4) | 0.84 | 0.86 | 0.83 | 0.86 | 0.95 | 0.88 | 0.90 |
| T23/(T12+T34) | 0.59 | 0.60 | 0.57 | 0.57 | 0.81 | 0.59 | 0.58 |
| (CT5+CT6)/(T56+T67) | 0.67 | 0.73 | 0.70 | 0.71 | 0.68 | 0.64 | 0.63 |
| SAG61/SAG62 | 0.69 | 0.66 | 0.68 | 0.69 | 0.64 | 0.74 | 0.74 |
| SAG71/SAG72 | 0.88 | 0.91 | 0.92 | 0.93 | 0.88 | 0.89 | 0.89 |
Watch 15
The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens 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 (36)
1. The optical imaging lens assembly comprises, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having optical power,
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 total effective focal length f of the optical imaging lens group and the maximum half field angle Semi-FOV of the optical imaging lens group satisfy f × tan (Semi-FOV) > 7.5mm, and
the distance TT L between the object side surface of the first lens and 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 meet the condition that TT L/ImgH is less than 1.3.
2. The optical imaging lens group of claim 1, wherein the maximum effective radius DT51 of the object side surface of the fifth lens and the maximum effective radius DT71 of the object side surface of the seventh lens satisfy: 0.3 < DT51/DT71 < 0.8.
3. The optical imaging lens group of claim 1 wherein the total effective focal length f of the optical imaging lens group and the effective focal length f1 of the first lens satisfy: f1/f is more than 0.5 and less than 1.0.
4. The optical imaging lens group of claim 1, wherein the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -1.0 < f7/f6 < 0.
5. The optical imaging lens group of claim 1 wherein the total effective focal length f of the optical imaging lens group, 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: f/(R2-R1) is more than 0.5 and less than 1.5.
6. The optical imaging lens group of claim 1 wherein the second lens element has a negative power and has a convex object-side surface and a concave image-side surface.
7. The optical imaging lens group of claim 6, wherein the effective focal length f2 of the second lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.5 < (R4-R3)/f2 < 1.5.
8. The optical imaging lens group of claim 1,
the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the fourth lens has negative focal power, and the image side surface of the fourth lens is a concave surface; and
the object side surface of the fifth lens is a convex surface.
9. The optical imaging lens group of claim 8, wherein the radius of curvature of the object-side surface of the third lens, R5, and the radius of curvature of the image-side surface of the third lens, R6, satisfy: 0.5 < R5/R6 < 1.5.
10. The optical imaging lens group of claim 8, 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: 0.3 < R9/R8 < 1.3.
11. The optical imaging lens group of claim 1,
the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; and
the seventh lens element has a negative focal power, and has a concave object-side surface and a concave image-side surface.
12. The optical imaging lens group of claim 11 wherein the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy: r11/f6 is more than 0.5 and less than 1.0.
13. The optical imaging lens group of claim 11, wherein the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: -1.0 < R13/R14 < 0.
14. The optical imaging lens group of claim 1, wherein a distance SAG61 on the optical axis from an intersection point 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 to 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 satisfies: 0.5 < SAG61/SAG62 < 1.0.
15. The optical imaging lens group of claim 1, wherein a distance SAG71 on the optical axis from an intersection point of an object-side surface of the seventh lens and the optical axis to an effective radius vertex of an object-side surface of the seventh 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 an image-side surface of the seventh lens satisfies: 0.7 < SAG71/SAG72 < 1.2.
16. The optical imaging lens group of any one of claims 1 to 15, wherein 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, and a central thickness CT4 of the fourth lens on the optical axis satisfy: 0.7 < CT1/(CT2+ CT3+ CT4) < 1.2.
17. The optical imaging lens group according to any one of claims 1 to 15, 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, and a separation distance T34 on the optical axis of the third lens and the fourth lens satisfy: 0.5 < T23/(T12+ T34) < 1.
18. The optical imaging lens group according to any one of claims 1 to 15, wherein a central thickness CT5 of the fifth lens on the optical axis, a central thickness CT6 of the sixth lens on the optical axis, a separation distance T56 of the fifth lens and the sixth lens on the optical axis, and a separation distance T67 of the sixth lens and the seventh lens on the optical axis satisfy: 0.5 < (CT5+ CT6)/(T56+ T67) < 1.0.
19. The optical imaging lens assembly comprises, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having optical power,
the total effective focal length f of the optical imaging lens group and the maximum half field angle Semi-FOV of the optical imaging lens group satisfy f × tan (Semi-FOV) > 7.5mm, and
the total effective focal length f of the optical imaging lens group and the effective focal length f1 of the first lens meet the following conditions: f1/f is more than 0.5 and less than 1.0.
20. The optical imaging lens group of claim 19 wherein the maximum effective radius DT51 of the object side surface of the fifth lens and the maximum effective radius DT71 of the object side surface of the seventh lens satisfy: 0.3 < DT51/DT71 < 0.8.
21. The optical imaging lens group of claim 19 wherein the total effective focal length f of the optical imaging lens group and the effective focal length f1 of the first lens satisfy: f1/f is more than 0.5 and less than 1.0.
22. The optical imaging lens group of claim 19 wherein the total effective focal length f of the optical imaging lens group, 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: f/(R2-R1) is more than 0.5 and less than 1.5.
23. The optical imaging lens group of claim 19 wherein the second lens element has a negative power and has a convex object-side surface and a concave image-side surface.
24. The optical imaging lens group of claim 23 wherein the effective focal length f2 of the second lens, the radius of curvature R3 of the object side surface of the second lens, and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.5 < (R4-R3)/f2 < 1.5.
25. The optical imaging lens group of claim 19,
the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the fourth lens has negative focal power, and the image side surface of the fourth lens is a concave surface; and
the object side surface of the fifth lens is a convex surface.
26. The optical imaging lens group of claim 25, wherein the radius of curvature of the object-side surface of the third lens, R5, and the radius of curvature of the image-side surface of the third lens, R6, satisfy: 0.5 < R5/R6 < 1.5.
27. The optical imaging lens group of claim 25, 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: 0.3 < R9/R8 < 1.3.
28. The optical imaging lens group of claim 19,
the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; and
the seventh lens element has a negative focal power, and has a concave object-side surface and a concave image-side surface.
29. The optical imaging lens group of claim 28 wherein the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -1.0 < f7/f6 < 0.
30. The optical imaging lens group of claim 28 wherein the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy: r11/f6 is more than 0.5 and less than 1.0.
31. The optical imaging lens group of claim 28, wherein the radius of curvature R13 of the object-side surface of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: -1.0 < R13/R14 < 0.
32. The optical imaging lens group of claim 28 wherein a distance SAG61 on the optical axis from an intersection point 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 to 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 satisfies: 0.5 < SAG61/SAG62 < 1.0.
33. The optical imaging lens group of claim 28 wherein a distance SAG71 on the optical axis from an intersection point of an object-side surface of the seventh lens and the optical axis to an effective radius vertex of an object-side surface of the seventh 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 an image-side surface of the seventh lens satisfies: 0.7 < SAG71/SAG72 < 1.2.
34. The optical imaging lens group of any one of claims 19 to 33, wherein 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, and a central thickness CT4 of the fourth lens on the optical axis satisfy: 0.7 < CT1/(CT2+ CT3+ CT4) < 1.2.
35. The optical imaging lens group of any one of claims 19 to 33, 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, and a separation distance T34 on the optical axis of the third lens and the fourth lens satisfy: 0.5 < T23/(T12+ T34) < 1.
36. The optical imaging lens group of any one of claims 19 to 33, wherein a central thickness CT5 of the fifth lens on the optical axis, a central thickness CT6 of the sixth lens on the optical axis, a separation distance T56 of the fifth lens and the sixth lens on the optical axis, and a separation distance T67 of the sixth lens and the seventh lens on the optical axis satisfy: 0.5 < (CT5+ CT6)/(T56+ T67) < 1.0.
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| CN110542996A (en) * | 2019-09-27 | 2019-12-06 | 浙江舜宇光学有限公司 | Optical imaging lens group |
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| CN114637094A (en) * | 2022-02-18 | 2022-06-17 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
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| CN110542996A (en) * | 2019-09-27 | 2019-12-06 | 浙江舜宇光学有限公司 | Optical imaging lens group |
| CN110542996B (en) * | 2019-09-27 | 2024-05-03 | 浙江舜宇光学有限公司 | Optical imaging lens group |
| TWI751905B (en) * | 2020-08-18 | 2022-01-01 | 南韓商三星電機股份有限公司 | Imaging lens system |
| CN113325554A (en) * | 2020-10-13 | 2021-08-31 | 浙江舜宇光学有限公司 | Optical imaging lens group |
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| CN114637094A (en) * | 2022-02-18 | 2022-06-17 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
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