CN215416079U9 - Optical imaging lens - Google Patents
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- CN215416079U9 CN215416079U9 CN202122108508.1U CN202122108508U CN215416079U9 CN 215416079 U9 CN215416079 U9 CN 215416079U9 CN 202122108508 U CN202122108508 U CN 202122108508U CN 215416079 U9 CN215416079 U9 CN 215416079U9
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Abstract
The utility model discloses an optical imaging lens, which sequentially comprises the following components from an object side to an image side along an optical axis: a diaphragm; a first lens having an optical power; a second lens having a negative optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having a negative optical power; a sixth lens having optical power; a seventh lens having optical power; and an eighth lens having optical power; wherein a center thickness CT6 of the sixth lens on the optical axis and an edge thickness ET6 of the sixth lens satisfy: 1.5 < CT6/ET6 < 2.0. And controlling the field curvature contribution of each field of view of the system within a reasonable range by restricting the ratio of the central thickness and the edge thickness of the sixth lens object.
Description
Technical Field
The utility model belongs to the field of optical imaging, and particularly relates to an optical imaging lens comprising eight lenses.
Background
With the increasing powerful photographing function of the smart phone, the demand of people for photographing by using the smart phone is also enlarged, and a plurality of application scenes which are not covered by the conventional mobile phone lens, such as optical zooming, a large image plane, an ultra-wide angle, a high-definition portrait and the like, are increased, especially the demand of the high-definition portrait lens is increased.
Based on the strong demand direction, the utility model provides an optical imaging lens consisting of eight lenses, and the optical imaging lens meets the requirements of small volume, large aperture and large image surface.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an optical imaging lens consisting of eight lenses, which has the characteristics of small volume, large aperture and large image surface.
The present application provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising:
a diaphragm;
a first lens having an optical power;
a second lens having a negative optical power;
a third lens having optical power;
the fourth lens with positive focal power has a concave object-side surface and a convex image-side surface;
a fifth lens having a negative optical power;
a sixth lens element with a focal power, wherein the object-side surface of the sixth lens element is concave and the image-side surface of the sixth lens element is convex;
a seventh lens having optical power;
an eighth lens having optical power;
wherein a center thickness CT6 of the sixth lens on the optical axis and an edge thickness ET6 of the sixth lens satisfy: 1.5 < CT6/ET6 < 2.0.
According to one embodiment of the present application, ImgH, which is half the diagonal length of the effective pixel region on the imaging plane, and TTL, which is the on-axis distance from the object-side surface of the first lens to the imaging plane, satisfy: TTL/ImgH is less than 1.3.
According to one embodiment of the application, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 2.0.
According to one embodiment of the application, half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies: Semi-FOV > 40.
According to one embodiment of the present application, a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 2.5 < (R6+ R5)/(R6-R5) < 5.5.
According to one embodiment of the present application, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, satisfies: ImgH > 8.0 mm.
According to one embodiment of the present application, a radius of curvature R6 of the image-side surface of the third lens and a radius of curvature R7 of the object-side surface of the fourth lens satisfy: -4.5 < (R6-R7)/(R6+ R7) < -1.0.
According to one embodiment of the present application, an on-axis distance SAG11 between an intersection point of the first lens object-side surface and the optical axis to an effective radius vertex of the first lens object-side surface and an on-axis distance SAG22 between an intersection point of the second lens image-side surface and the optical axis to an effective radius vertex of the second lens image-side surface satisfy: 2.5 < (SAG11+ SAG22)/(SAG11-SAG22) < 6.5.
According to one embodiment of the present application, an on-axis distance SAG52 between an intersection point of the fifth lens image-side surface and the optical axis to an effective radius vertex of the fifth lens image-side surface and an on-axis distance SAG61 between an intersection point of the sixth lens object-side surface and the optical axis to an effective radius vertex of the sixth lens object-side surface satisfy: -4.0 < (SAG52-SAG61)/(SAG52+ SAG61) < -2.0.
According to one embodiment of the application, the sum of the central thicknesses of all lenses on the optical axis, Σ CT and the central thickness of the second lens on the optical axis CT2, satisfies: 13.5 < ∑ CT/CT2 ≦ 16.
According to one embodiment of the application, the on-axis distance TTL from the object-side surface of the first lens to the image plane and the distance SD from the stop to the image-side surface of the last lens satisfy: TTL/SD is more than 1.0 and less than 1.5.
According to an embodiment of the present application, the abbe number V1 of the first lens and the abbe number V2 of the second lens satisfy: V1-V2 > 30.
According to an embodiment of the present application, the abbe number V1 of the first lens and the abbe number V4 of the fourth lens satisfy: V1-V4< 20.
The utility model has the beneficial effects that:
the optical imaging lens provided by the utility model comprises a plurality of lenses, such as a first lens to an eighth lens. The effective focal length of each lens of the optical imaging lens is constrained, and the characteristics of large image surface and ultra-thinning of the optical imaging lens are ensured; the positive and negative directions of curvature of the fourth lens and the fifth lens are restricted, distortion of the system can be reasonably controlled, the optical imaging lens has good shooting performance, and the characteristic of high image quality of the system is guaranteed. And controlling the field curvature contribution of each field of view of the system within a reasonable range by restricting the ratio of the central thickness and the edge thickness of the sixth lens object.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a lens assembly of an optical imaging lens system according to embodiment 1 of the present invention;
fig. 2a to 2d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, in an optical imaging lens according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a lens assembly according to embodiment 2 of the present invention;
fig. 4a to 4d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, according to an optical imaging lens of embodiment 2 of the present invention;
FIG. 5 is a schematic diagram of a lens assembly according to embodiment 3 of the present invention;
fig. 6a to 6d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to embodiment 3 of the present invention;
FIG. 7 is a schematic diagram of a lens assembly according to embodiment 4 of the present invention;
fig. 8a to 8d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, in an optical imaging lens according to embodiment 4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present invention.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
In the description of the present invention, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. Features, principles and other aspects of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Exemplary embodiments
The optical imaging lens according to an exemplary embodiment of the present invention includes eight lens elements, in order from an object side to an image side along an optical axis: the lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein the lenses are independent from each other, and an air space is formed between the lenses on an optical axis.
The present exemplary embodiment provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a diaphragm; a first lens having an optical power; a second lens having a negative optical power; a third lens having optical power; a fourth lens having a focal power, wherein the object-side surface of the fourth lens is a concave surface, and the image-side surface of the fourth lens is a convex surface; a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a sixth lens element with a focal power, wherein the object-side surface of the sixth lens element is concave and the image-side surface of the sixth lens element is convex; a seventh lens having optical power; and an eighth lens having optical power. The effective focal length of each lens of the optical system is restricted, so that the characteristics of large image surface and ultra-thinning of the camera lens are ensured; the positive and negative directions of the curvatures of the fourth lens and the fifth lens are restricted, the distortion of the system can be reasonably controlled, the system has good shooting performance, and the characteristic of high image quality of the system is ensured.
In the present exemplary embodiment, the center thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 of the sixth lens satisfy: 1.5 < CT6/ET6 < 2.0. And controlling the field curvature contribution of each field of view of the system within a reasonable range by restricting the ratio of the central thickness and the edge thickness of the sixth lens object. More specifically, the center thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 of the sixth lens satisfy: 1.60 < CT6/ET6 < 1.90.
In the present exemplary embodiment, ImgH that is half the diagonal length of the effective pixel region on the imaging plane and the on-axis distance TTL from the object-side surface of the first lens to the imaging plane satisfy: TTL/ImgH is less than 1.3. The optical total length of the whole optical imaging lens is limited to a certain size, so that the optical imaging lens has the characteristic of ultra-thinness. More specifically, ImgH which is half the diagonal length of the effective pixel region on the imaging plane and TTL which is the on-axis distance from the object-side surface of the first lens to the imaging plane satisfy: TTL/ImgH is less than 1.25.
In the present exemplary embodiment, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 2.0. The optical imaging lens can be ensured to have a larger aperture, the light inlet quantity of the optical imaging lens is improved, and the use requirement of a dark state environment is met. More specifically, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD is less than or equal to 1.99.
In the present exemplary embodiment, half of the maximum field angle Semi-FOV of the optical imaging system satisfies: Semi-FOV > 40. The optical imaging lens can obtain a wider imaging range, and the angle of the field of view is larger than 80 degrees. More specifically, half of the Semi-FOV of the maximum field angle of the optical imaging system satisfies: Semi-FOV > 43.
In the present exemplary 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 satisfy: 2.5 < (R6+ R5)/(R6-R5) < 5.5. The coma contribution rate of the third lens is controlled within a reasonable range by restricting the ranges of the curvature radius of the object side and the curvature radius of the image side of the third lens, so that the coma generated by the system lens can be well balanced, and good imaging quality of an off-axis field is obtained. More specifically, 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 satisfy: 2.70 < (R6+ R5)/(R6-R5) < 5.4.
In the present exemplary embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, satisfies: ImgH > 8.0 mm. The optical imaging lens is ensured to have a larger imaging range. More specifically, ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, satisfies: ImgH > 8.20 mm.
In the present exemplary embodiment, the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy: -4.5 < (R6-R7)/(R6+ R7) < -1.0. The third lens of the camera lens has a reasonable shape by restricting the relation between the curvature radius of the image surface of the third lens and the curvature radius of the object side surface of the fourth lens, so that the system focal power is reasonably born, and the aberration generated by the rear lens is balanced; and simultaneously weakening the secondary reflection ghost image generated between the third lens and the fourth lens. More specifically, the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy: -4.40 < (R6-R7)/(R6+ R7) < -1.30.
In the present exemplary embodiment, an on-axis distance SAG11 between an intersection point of the first lens object-side surface and the optical axis to an effective radius vertex of the first lens object-side surface and an on-axis distance SAG22 between an intersection point of the second lens image-side surface and the optical axis to an effective radius vertex of the second lens image-side surface satisfy: 2.5 < (SAG11+ SAG22)/(SAG11-SAG22) < 6.5. By controlling the object-side rise and image-side rise of the first lens and the second lens within a certain range, the deflection angle of the marginal rays of the system can be reasonably controlled, and the optical sensitivities of the first lens and the second lens of the sensitivity of the system are effectively reduced. More specifically, an on-axis distance SAG11 between an intersection of the first lens object-side surface and the optical axis to an effective radius vertex of the first lens object-side surface and an on-axis distance SAG22 between an intersection of the second lens image-side surface and the optical axis to an effective radius vertex of the second lens image-side surface satisfy: 2.80 < (SAG11+ SAG22)/(SAG11-SAG22) < 6.10.
In the present exemplary embodiment, an on-axis distance SAG52 between an intersection point of the fifth lens image-side surface and the optical axis to an effective radius vertex of the fifth lens image-side surface and an on-axis distance SAG61 between an intersection point of the sixth lens object-side surface and the optical axis to an effective radius vertex of the sixth lens object-side surface satisfy: -4.0 < (SAG52-SAG61)/(SAG52+ SAG61) < -2.0. By controlling the object side rise and the image side rise of the fifth lens within a certain range, the deflection angle of the edge light of the system can be reasonably controlled, and the sensitivity of the system is effectively reduced. More specifically, an on-axis distance SAG52 between an intersection of the fifth lens image-side surface and the optical axis and an effective radius vertex of the fifth lens image-side surface and an on-axis distance SAG61 between an intersection of the sixth lens object-side surface and the optical axis and an effective radius vertex of the sixth lens object-side surface satisfy: -3.70 < (SAG52-SAG61)/(SAG52+ SAG61) < -2.20.
In the present exemplary embodiment, the sum of the center thicknesses of all the lenses on the optical axis, Σ CT, and the center thickness CT2 of the second lens on the optical axis satisfies: 13.5 < ∑ CT/CT2 ≦ 16. The sum of the central thicknesses of the first lens, the second lens and the seventh lens and the medium-thickness ratio of the second lens are reasonably adjusted, so that the ghost image risk of the second lens can be effectively reduced, and the size compression of the shooting lens group is facilitated. More specifically, the sum of the center thicknesses of all the lenses on the optical axis, Σ CT, and the center thickness CT2 of the second lens on the optical axis satisfies: 13.5 < ∑ CT/CT2 ≤ 15.5.
In the present exemplary embodiment, the on-axis distance TTL from the object-side surface of the first lens to the image plane and the distance SD from the stop to the image-side surface of the last lens satisfy: TTL/SD is more than 1.0 and less than 1.5. The relative relation between the total length of the over-constrained optical system and the position of the diaphragm can reasonably control the distortion of the system, so that the system has good distortion performance. More specifically, the on-axis distance TTL from the object-side surface of the first lens to the image-side surface and the distance SD from the stop to the image-side surface of the last lens satisfy: TTL/SD is more than 1.20 and less than 1.45.
In the present exemplary embodiment, the abbe number V1 of the first lens and the abbe number V2 of the second lens satisfy: V1-V2 > 30. The vertical axis chromatic aberration, axial chromatic aberration, and chromatic spherical aberration of the system can be strongly corrected by controlling the abbe numbers of the first lens and the second lens which are positioned at the front of the system. Thereby ensuring the image quality of the system. More specifically, the abbe number V1 of the first lens and the abbe number V2 of the second lens satisfy: V1-V2 > 36.
In the present exemplary embodiment, the abbe number V1 of the first lens and the abbe number V4 of the fourth lens satisfy: V1-V4< 20. The first lens and the fourth lens of the system are made of materials with small Abbe number aberration as much as possible, so that the magnification chromatic aberration and the vertical axis chromatic aberration of the system can be effectively corrected, and the image quality of the system is better guaranteed. More specifically, the abbe number V1 of the first lens and the abbe number V4 of the fourth lens satisfy: V1-V4< 15.
In the present exemplary embodiment, the object-side surface and the image-side surface of any one of the first lens E1 through the eighth lens E8 are aspheric, and the profile x of each aspheric lens can be defined using, but not limited to, the following aspheric formula:
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.
In the present exemplary embodiment, the above-described optical imaging lens may further include a diaphragm. The stop may be disposed at an appropriate position as needed, for example, the stop may be disposed between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element on the imaging surface.
The optical imaging lens according to the above embodiment of the present invention may employ a plurality of lenses, for example, the above eight lenses. The optical imaging lens has the characteristics of large imaging image surface, wide imaging range and high imaging quality by reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, and the ultrathin property of the mobile phone is ensured.
In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the eighth lens is an aspheric mirror surface. The aspheric lens is characterized in that: the aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and astigmatic aberration, unlike a spherical lens having a constant curvature from the lens center to the lens periphery, in which the curvature is continuously varied from the lens center to the lens periphery. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens is an aspherical mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although eight lenses are exemplified in the embodiment, the optical imaging lens is not limited to include eight lenses, and may include other numbers of lenses if necessary.
Specific embodiments of an optical imaging lens suitable for the above-described embodiments are further described below with reference to the drawings.
Detailed description of the preferred embodiment 1
Fig. 1 is a schematic view of a lens assembly according to embodiment 1 of the present disclosure, wherein the optical imaging lens includes, in order from an object side to an image side along an optical axis: a 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, an eighth lens E8, a filter E9, and an image forming surface S19.
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 concave object-side surface S7 and a convex 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 negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging plane S19.
As shown in table 1, a basic parameter table of the optical imaging lens of embodiment 1 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).
TABLE 1
As shown in table 2, in embodiment 1, the total effective focal length f of the optical imaging lens is 8.69mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 10.20mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 8.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 43.0 °.
TABLE 2
The optical imaging lens in embodiment 1 satisfies:
CT6/ET6 is 1.73; where CT6 is the central thickness of the sixth lens on the optical axis, and ET6 is the edge thickness of the sixth lens.
TTL/ImgH is 1.23; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and TTL is the on-axis distance from the object-side surface of the first lens element to the imaging surface.
f/EPD is 1.99; where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging system.
(R6+ R5)/(R6-R5) ═ 5.36; wherein, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.
(R6-R7)/(R6+ R7) — 1.70; wherein R6 is the curvature radius of the image side surface of the third lens, and R7 is the curvature radius of the object side surface of the fourth lens.
(SAG11+ SAG22)/(SAG11-SAG22 is 4.34, wherein SAG11 is an on-axis distance between the intersection point of the object side surface of the first lens and the optical axis and the effective radius vertex of the object side surface of the first lens, and SAG22 is an on-axis distance between the intersection point of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens.
(SAG52-SAG61)/(SAG52+ SAG61) — 3.28; SAG52 is an on-axis distance from an intersection point of the image side surface of the fifth lens and the optical axis to an effective radius vertex of the image side surface of the fifth lens, and SAG61 is an on-axis distance from an intersection point of the object side surface of the sixth lens and the optical axis to an effective radius vertex of the object side surface of the sixth lens.
Σ CT/CT2 ═ 13.91; where Σ CT is the sum of the center thicknesses of all lenses on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.
TTL/SD is 1.30; wherein, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and SD is the distance from the diaphragm to the image side surface of the last lens.
V1-V2 ═ 36.90; wherein V1 is the abbe number of the first lens, and V2 is the abbe number of the second lens.
V1-V4 ═ 14.20; where V1 is the abbe number of the first lens and V4 is the abbe number of the fourth lens.
In example 1, the object-side surface and the image-side surface of any one of the first lens element E1 through the eighth lens element E8 are aspheric, and table 3 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S16 in example 14、A6、A8、A10、A12、A14、A16、A18、A20、 A22、A24、A26、A28And A30。
TABLE 3
Fig. 2a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2c shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 2a to 2d, the optical imaging lens according to embodiment 1 can achieve good imaging quality.
Specific example 2
Fig. 3 is a schematic view of a lens assembly according to embodiment 2 of the present invention, the optical imaging lens, in order from an object side to an image side along an optical axis, includes: a 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, an eighth lens E8, a filter E9, and an image forming surface S19.
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 concave object-side surface S7 and a convex 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 negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a convex image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging plane S19.
As shown in table 4, the basic parameter table of the optical imaging lens of embodiment 2 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).
TABLE 4
As shown in table 5, in embodiment 2, the total effective focal length f of the optical imaging lens is 8.66mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 10.20mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 8.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 43.0 °.
TABLE 5
The optical imaging lens in embodiment 2 satisfies:
CT6/ET6 is 1.62; where CT6 is the central thickness of the sixth lens on the optical axis, and ET6 is the edge thickness of the sixth lens.
TTL/ImgH is 1.23; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and TTL is the on-axis distance from the object-side surface of the first lens element to the imaging surface.
f/EPD is 1.95; where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging system.
(R6+ R5)/(R6-R5) ═ 4.70; wherein, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.
(R6-R7)/(R6+ R7) — 4.39; wherein R6 is the curvature radius of the image side surface of the third lens, and R7 is the curvature radius of the object side surface of the fourth lens.
(SAG11+ SAG22)/(SAG11-SAG22 is 6.05, wherein SAG11 is an on-axis distance between the intersection of the object side surface of the first lens and the optical axis and the effective radius vertex of the object side surface of the first lens, and SAG22 is an on-axis distance between the intersection of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens.
(SAG52-SAG61)/(SAG52+ SAG61) — 3.64; SAG52 is an on-axis distance from an intersection point of the image side surface of the fifth lens and the optical axis to an effective radius vertex of the image side surface of the fifth lens, and SAG61 is an on-axis distance from an intersection point of the object side surface of the sixth lens and the optical axis to an effective radius vertex of the object side surface of the sixth lens.
Σ CT/CT2 ═ 14.08; where Σ CT is the sum of the center thicknesses of all lenses on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.
TTL/SD is 1.30; wherein, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and SD is the distance from the diaphragm to the image side surface of the last lens.
V1-V2 ═ 36.90; wherein V1 is the abbe number of the first lens, and V2 is the abbe number of the second lens.
V1-V4 ═ 14.20; where V1 is the abbe number of the first lens and V4 is the abbe number of the fourth lens.
In example 2, the object-side surface and the image-side surface of any one of the first lens element E1 through the eighth lens element E8 are aspheric, and table 6 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S16 in example 24、A6、A8、A10、A12、A14、A16、A18、A20、 A22、A24、A26、A28And A30。
TABLE 6
Fig. 4a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4c shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 4a to 4d, the optical imaging lens according to embodiment 2 can achieve good imaging quality.
Specific example 3
Fig. 5 is a lens assembly according to embodiment 3 of the present invention, which, in order from an object side to an image side along an optical axis: a 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, an eighth lens E8, a filter E9, and an image forming surface S19.
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 convex 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 concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging plane S19.
As shown in table 7, the basic parameter table of the optical imaging lens of embodiment 3 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
TABLE 7
As shown in table 8, in embodiment 3, the total effective focal length f of the optical imaging lens is 8.66mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 10.16mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 8.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 43.3 °.
TABLE 8
The optical imaging lens in embodiment 3 satisfies:
CT6/ET6 is 1.78; where CT6 is the central thickness of the sixth lens on the optical axis, and ET6 is the edge thickness of the sixth lens.
TTL/ImgH is 1.23; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and TTL is the on-axis distance from the object-side surface of the first lens element to the imaging surface.
f/EPD is 1.75; where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging system.
(R6+ R5)/(R6-R5) ═ 2.79; wherein, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.
(R6-R7)/(R6+ R7) — 1.84; wherein R6 is the curvature radius of the image side surface of the third lens, and R7 is the curvature radius of the object side surface of the fourth lens.
(SAG11+ SAG22)/(SAG11-SAG22 is 2.87, wherein SAG11 is an on-axis distance between the intersection of the object side surface of the first lens and the optical axis and the effective radius vertex of the object side surface of the first lens, and SAG22 is an on-axis distance between the intersection of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens.
(SAG52-SAG61)/(SAG52+ SAG61) — 2.36; SAG52 is an on-axis distance from an intersection point of the image side surface of the fifth lens and the optical axis to an effective radius vertex of the image side surface of the fifth lens, and SAG61 is an on-axis distance from an intersection point of the object side surface of the sixth lens and the optical axis to an effective radius vertex of the object side surface of the sixth lens.
Σ CT/CT2 ═ 14.93; where Σ CT is the sum of the center thicknesses of all lenses on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.
TTL/SD is 1.44; wherein, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and SD is the distance from the diaphragm to the image side surface of the last lens.
V1-V2 ═ 36.90; wherein V1 is the abbe number of the first lens, and V2 is the abbe number of the second lens.
V1-V4 ═ 14.20; where V1 is the abbe number of the first lens and V4 is the abbe number of the fourth lens.
In example 3, the object-side surface and the image-side surface of any one of the first lens element E1 through the eighth lens element E8 are aspheric, and table 9 shows the high-order term coefficients a usable for the aspheric mirror surfaces S1 through S16 in example 34、A6、A8、A10、A12、A14、A16、A18、A20、 A22、A24、A26、A28And A30。
TABLE 9
Fig. 6a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6c shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 6a to 6d, the optical imaging lens according to embodiment 3 can achieve good imaging quality.
Specific example 4
Fig. 7 is a lens assembly structure of the optical imaging lens system according to embodiment 4 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a 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, an eighth lens E8, a filter E9, and an image forming surface S19.
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 concave object-side surface S7 and a convex 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 concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has positive power, and has a convex object-side surface S13 and a concave image-side surface S14. The eighth lens element E8 has negative power, and has a concave object-side surface S15 and a concave image-side surface S16. Filter E9 has an object side S17 and an image side S18. The light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging plane S19.
As shown in table 10, the basic parameter table of the optical imaging lens of embodiment 4 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Watch 10
As shown in table 11, in embodiment 4, the total effective focal length f of the optical imaging lens is 8.63mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S17 is 9.01mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 8.27 mm. Half of the maximum field angle Semi-FOV of the optical imaging lens is 43.4 °.
TABLE 11
The optical imaging lens in embodiment 4 satisfies:
CT6/ET6 is 1.86; where CT6 is the central thickness of the sixth lens on the optical axis, and ET6 is the edge thickness of the sixth lens.
TTL/ImgH is 1.09; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and TTL is the on-axis distance from the object-side surface of the first lens element to the imaging surface.
f/EPD is 1.89; where f is the effective focal length of the optical imaging lens, and EPD is the entrance pupil diameter of the optical imaging system.
(R6+ R5)/(R6-R5) ═ 3.28; wherein, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.
(R6-R7)/(R6+ R7) — 1.32; wherein R6 is the curvature radius of the image side surface of the third lens, and R7 is the curvature radius of the object side surface of the fourth lens.
(SAG11+ SAG22)/(SAG11-SAG22 is 3.14, wherein SAG11 is an on-axis distance between the intersection point of the object side surface of the first lens and the optical axis and the effective radius vertex of the object side surface of the first lens, and SAG22 is an on-axis distance between the intersection point of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens.
(SAG52-SAG61)/(SAG52+ SAG61) — 2.26; SAG52 is an on-axis distance from an intersection point of the image side surface of the fifth lens and the optical axis to an effective radius vertex of the image side surface of the fifth lens, and SAG61 is an on-axis distance from an intersection point of the object side surface of the sixth lens and the optical axis to an effective radius vertex of the object side surface of the sixth lens.
Σ CT/CT2 ═ 15.41; where Σ CT is the sum of the center thicknesses of all lenses on the optical axis, and CT2 is the center thickness of the second lens on the optical axis.
TTL/SD is 1.25; wherein, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and SD is the distance from the diaphragm to the image side surface of the last lens.
V1-V2 ═ 36.90; wherein V1 is the abbe number of the first lens, and V2 is the abbe number of the second lens.
V1-V4 ═ 14.20; where V1 is the abbe number of the first lens and V4 is the abbe number of the fourth lens.
In example 4, the object-side surface and the image-side surface of any one of the first lens element E1 through the eighth lens element E8 are aspheric, and table 12 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S16 in example 44、A6、A8、A10、A12、A14、A16、A18、A20、A22、 A24、A26、A28And A30。
TABLE 12
Fig. 8a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8c shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 8a to 8d, the optical imaging lens according to embodiment 4 can achieve good imaging quality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, improvements, equivalents and the like that fall within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (13)
1. An optical imaging lens, in order from an object side to an image side along an optical axis, comprising:
a diaphragm;
a first lens having an optical power;
a second lens having a negative optical power;
a third lens having optical power;
the fourth lens with positive focal power has a concave object-side surface and a convex image-side surface;
a fifth lens having a negative optical power;
a sixth lens element with a focal power, wherein the object-side surface of the sixth lens element is concave and the image-side surface of the sixth lens element is convex;
a seventh lens having optical power;
an eighth lens having optical power;
wherein a center thickness CT6 of the sixth lens on the optical axis and an edge thickness ET6 of the sixth lens satisfy: 1.5 < CT6/ET6 < 2.0.
2. The optical imaging lens of claim 1, wherein ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, and TTL, which is the on-axis distance from the object side surface of the first lens to the imaging plane, satisfy: TTL/ImgH is less than 1.3.
3. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 2.0.
4. The optical imaging lens according to claim 1, wherein the Semi-FOV of the maximum field angle of the optical imaging system satisfies: Semi-FOV > 40.
5. The optical imaging lens of claim 1, wherein 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 satisfy: 2.5 < (R6+ R5)/(R6-R5) < 5.5.
6. The optical imaging lens according to claim 1, wherein ImgH, which is half the diagonal length of the effective pixel area on the imaging plane, satisfies: ImgH > 8.0 mm.
7. The optical imaging lens of claim 1, wherein the radius of curvature R6 of the image-side surface of the third lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy: -4.5 < (R6-R7)/(R6+ R7) < -1.0.
8. The optical imaging lens of claim 1, wherein an on-axis distance SAG11 from the intersection of the first lens object-side surface and the optical axis to the effective radius vertex of the first lens object-side surface and an on-axis distance SAG22 from the intersection of the second lens image-side surface and the optical axis to the effective radius vertex of the second lens image-side surface satisfy: 2.5 < (SAG11+ SAG22)/(SAG11-SAG22) < 6.5.
9. The optical imaging lens of claim 1, wherein an on-axis distance SAG52 from an intersection point of the fifth lens image side surface and the optical axis to an effective radius vertex of the fifth lens image side surface and an on-axis distance SAG61 from an intersection point of the sixth lens object side surface and the optical axis to an effective radius vertex of the sixth lens object side surface satisfy: -4.0 < (SAG52-SAG61)/(SAG52+ SAG61) < -2.0.
10. The optical imaging lens of claim 1, wherein sum of central thicknesses of all lenses on an optical axis, Σ CT and central thickness of the second lens on an optical axis CT2 satisfy: 13.5 < ∑ CT/CT2 ≦ 16.
11. The optical imaging lens of claim 1, wherein the on-axis distance TTL from the object-side surface of the first lens to the imaging surface and the distance SD from the stop to the image-side surface of the last lens satisfy: TTL/SD is more than 1.0 and less than 1.5.
12. The optical imaging lens of claim 1, wherein abbe number V1 of the first lens and abbe number V2 of the second lens satisfy: V1-V2 > 30.
13. The optical imaging lens of claim 1, wherein abbe number V1 of the first lens and abbe number V4 of the fourth lens satisfy: V1-V4< 20.
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