CN116661108A - Optical imaging lens - Google Patents

Optical imaging lens Download PDF

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Publication number
CN116661108A
CN116661108A CN202310590452.9A CN202310590452A CN116661108A CN 116661108 A CN116661108 A CN 116661108A CN 202310590452 A CN202310590452 A CN 202310590452A CN 116661108 A CN116661108 A CN 116661108A
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CN
China
Prior art keywords
lens
optical imaging
imaging lens
equal
optical
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CN202310590452.9A
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Chinese (zh)
Inventor
翟林燕
应永茂
曾繁胜
李晓蕾
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Sunny Optics Zhongshan Co Ltd
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Sunny Optics Zhongshan Co Ltd
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Application filed by Sunny Optics Zhongshan Co Ltd filed Critical Sunny Optics Zhongshan Co Ltd
Priority to CN202310590452.9A priority Critical patent/CN116661108A/en
Publication of CN116661108A publication Critical patent/CN116661108A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The application discloses an optical imaging lens, which sequentially comprises from an object side to an image side along an optical axis: the first lens is provided with negative 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; a second lens having negative optical power; the third lens is provided with negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface; a fourth lens having positive optical power; a fifth lens having positive optical power; a sixth lens having positive optical power; a seventh lens having negative optical power; and an eighth lens having positive optical power.

Description

Optical imaging lens
Technical Field
The application relates to the field of optical devices, in particular to an optical imaging lens.
Background
Along with the development of scientific technology, the requirements of fields such as panoramic monitoring, unmanned aerial vehicles, motion cameras, vehicle-mounted lenses and the like on the optical imaging lenses are continuously increased, and accordingly, the requirements on the quality of the optical imaging lenses are higher and higher.
For an optical imaging lens of an unmanned aerial vehicle or a moving camera, the optical imaging lens needs to have a high resolution, a large angle of view, a large aperture, and a large field of view range and high brightness. However, the conventional optical imaging lens cannot satisfy characteristics such as a large angle of view or a large aperture while realizing high resolution.
Disclosure of Invention
The present application provides an optical imaging lens that at least solves or partially solves at least one problem, or other problems, present in the prior art.
An aspect of the present application provides an optical imaging lens including, in order from an object side to an image side along an optical axis: the first lens is provided with negative 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; a second lens having negative optical power; the third lens is provided with negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface; a fourth lens having positive optical power; a fifth lens having positive optical power; a sixth lens having positive optical power; a seventh lens having negative optical power; and an eighth lens having positive optical power.
According to an exemplary embodiment of the present application, the optical imaging lens further includes a ninth lens having negative optical power and disposed between the object side and the first lens.
According to an exemplary embodiment of the application, the object-side surface of the second lens is convex and the image-side surface is concave.
According to an exemplary embodiment of the application, the object-side surface of the fourth lens element is convex and the image-side surface is concave.
According to an exemplary embodiment of the present application, the object-side surface of the fifth lens element is convex, and the image-side surface is convex.
According to an exemplary embodiment of the application, the object-side surface of the sixth lens element is convex and the image-side surface is convex.
According to an exemplary embodiment of the present application, the sixth lens is configured as a cemented lens, and includes a negative lens having a convex surface facing the object side and a positive lens having a biconvex shape.
According to an exemplary embodiment of the present application, the object-side surface of the seventh lens is concave, and the image-side surface is concave.
According to an exemplary embodiment of the present application, the object side surface of the eighth lens element is convex, and the image side surface is convex.
According to an exemplary embodiment of the present application, the object-side surface of the ninth lens element is convex and the image-side surface is concave.
According to an exemplary embodiment of the present application, the maximum light passing aperture D of the optical imaging lens and the effective focal length f9 of the ninth lens satisfy: -1.3.ltoreq.D/f9.ltoreq.0.1.
According to an exemplary embodiment of the present application, the effective focal length f9 of the ninth lens and the total effective focal length f of the optical imaging lens satisfy: f9/f is more than or equal to 1.3 and less than or equal to 10.8.
According to an exemplary embodiment of the present application, the radius of curvature R91 of the object side surface of the ninth lens and the radius of curvature R92 of the image side surface of the ninth lens satisfy: R91/R92 is more than or equal to 1.0 and less than or equal to 2.5.
According to an exemplary embodiment of the present application, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens satisfy: -9.6.ltoreq.f1/f.ltoreq.4.8.
According to an exemplary embodiment of the present application, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens satisfy: -4.5.ltoreq.f2/f.ltoreq.2.0.
According to an exemplary embodiment of the present application, the optical imaging lens further includes a stop, and the effective focal length f3 of the third lens and the effective focal length fa of the lens group before the stop satisfy: f3/fa is less than or equal to 1.8 and less than or equal to 2.8.
According to an exemplary embodiment of the present application, the optical imaging lens further includes a stop, and the effective focal length f4 of the fourth lens and the effective focal length fa of the lens group before the stop satisfy: -4.5.ltoreq.f4/fa.ltoreq.2.5.
According to an exemplary embodiment of the present application, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: f4/f5 is more than or equal to 0.8 and less than or equal to 2.0.
According to an exemplary embodiment of the present application, the effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging lens satisfy: f6/f is more than or equal to 2.2 and less than or equal to 5.2.
According to an exemplary embodiment of the present application, the effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging lens satisfy: -3.5.ltoreq.f7/f.ltoreq.1.5.
According to an exemplary embodiment of the present application, the effective focal length f8 of the eighth lens and the total effective focal length f of the optical imaging lens satisfy: f8/f is more than or equal to 2.1 and less than or equal to 3.8.
According to an exemplary embodiment of the present application, the optical imaging lens further includes a diaphragm, and the effective focal length fa of the lens group before the diaphragm and the total effective focal length f of the optical imaging lens satisfy: -fa/f is less than or equal to 1.5 and less than or equal to-0.8.
According to an exemplary embodiment of the present application, the optical imaging lens further includes a diaphragm, and the effective focal length fb of the lens group after the diaphragm and the total effective focal length f of the optical imaging lens satisfy: fb/f is more than or equal to 2.0 and less than or equal to 3.5.
According to an exemplary embodiment of the present application, the optical imaging lens further includes a stop, and the effective focal length fa of the lens group before the stop and the effective focal length fb of the lens group after the stop satisfy: -fa/fb is less than or equal to 0.6 and less than or equal to-0.3.
According to an exemplary embodiment of the present application, the optical imaging lens further includes a diaphragm, and the air interval T4S of the fourth lens and the diaphragm on the optical axis satisfies the optical total length TTL of the optical imaging lens: T4S/TTL is more than or equal to 0 and less than or equal to 0.1.
According to an exemplary embodiment of the present application, the optical imaging lens further includes a diaphragm, and an air interval T34 of the third lens and the fourth lens on the optical axis and an air interval T4S of the fourth lens and the diaphragm on the optical axis satisfy: T34/T4S is more than or equal to 0.2 and less than or equal to 1.2.
According to an exemplary embodiment of the present application, the radius of curvature R21 of the object side surface of the second lens and the radius of curvature R22 of the image side surface of the second lens satisfy: (R21-R22)/(R21+R22) is less than or equal to 0.1 and less than or equal to 1.2.
According to an exemplary embodiment of the present application, the center thickness CT4 of the fourth lens on the optical axis, the air interval T45 of the fourth lens and the fifth lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis satisfy: T45/(CT 4+ CT 5) is less than or equal to 0 and less than or equal to 0.1.
According to an exemplary embodiment of the present application, the maximum field angle FOV of the optical imaging lens, the image height H of the optical imaging lens at the maximum field angle, and the maximum light passing aperture D of the optical imaging lens satisfy: FOV/H/D is less than or equal to 1.5 and less than or equal to 2.8.
According to an exemplary embodiment of the present application, the total effective focal length f of the optical imaging lens and the entrance pupil diameter ENPD of the optical imaging lens satisfy: f/ENPD is more than or equal to 1.6 and less than or equal to 1.9.
According to an exemplary embodiment of the present application, the maximum light passing aperture D8 of the eighth lens and the image height H of the optical imaging lens at the maximum field angle satisfy: D8/H is more than or equal to 0.2 and less than or equal to 1.5.
According to an exemplary embodiment of the present application, the back focal length BFL of the optical imaging lens and the total optical length TTL of the optical imaging lens satisfy: BFL/TTL is more than or equal to 0.05 and less than or equal to 0.2.
The application adopts nine lenses, and can ensure that the optical imaging lens can meet the use of high and low temperature environments by reasonably distributing the focal power, the surface shape, the thickness, the interval, the reasonable parameter setting and the like of each lens, and realize at least one beneficial effect of high resolution (twenty-five million pixels), large field of view (FOV=196°), large aperture (FNO is less than or equal to 1.8), high and low temperature non-virtual focus and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1 shows a schematic configuration diagram of an optical imaging lens according to embodiment 1 of the present application;
fig. 2 shows a schematic configuration diagram of an optical imaging lens according to embodiment 2 of the present application;
fig. 3 is a schematic diagram showing the structure of an optical imaging lens according to embodiment 3 of the present application;
fig. 4 shows a schematic structural view of an optical imaging lens according to embodiment 4 of the present application; and
fig. 5 shows a schematic structural diagram of an optical imaging lens according to embodiment 5 of the present application.
Detailed Description
For a better understanding of the application, various aspects of the application are described in detail with reference to the drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, then 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 referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature.
Unless defined otherwise, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terms 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, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The optical imaging lens according to an exemplary embodiment of the present application may include 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, which are sequentially arranged from an object side to an image side along an optical axis. An air space may be provided between adjacent two lenses of the first to eighth lenses.
In an exemplary embodiment, the first lens may have negative optical power. The object-side surface of the first lens element may be convex, and the image-side surface thereof may be concave. By arranging the first lens in the structure, the incident angle of light on the object side surface of the second lens can be reduced, advanced aberration generated by the rear lens due to overlarge incident angle is avoided, and the image quality of the optical imaging lens is improved.
In an exemplary embodiment, the second lens may have negative optical power. The object-side surface of the second lens element may be convex, and the image-side surface may be concave. The second lens may be an aspherical lens. By arranging the second lens in the structure form, the aberration of the optical imaging lens in the central field area can be effectively corrected, and the large aperture of the optical imaging lens can be realized.
In an exemplary embodiment, the third lens may have negative optical power. The object-side surface of the third lens element may be concave, and the image-side surface may be concave. The third lens may be an aspherical lens. By setting the third lens in the above structural form, the aberration of the optical imaging lens in the central field area can be effectively corrected, and the large aperture of the optical imaging lens can be realized.
In an exemplary embodiment, the fourth lens may have positive optical power. The fourth lens element may have a convex object-side surface and a concave image-side surface. The fourth lens may be an aspherical lens. By setting the fourth lens in the above structural form, the aberration of the optical imaging lens in the central field area can be effectively corrected, and the large aperture of the optical imaging lens can be realized.
In an exemplary embodiment, the fifth lens may have positive optical power. The object side surface of the fifth lens element may be convex, and the image side surface of the fifth lens element may be convex. By arranging the fifth lens in the structural form and matching with the aspheric design of the fifth lens, the residual astigmatism of the front lens can be effectively corrected. The fifth lens is arranged in the structural form and matched with the spherical design of the fifth lens, and the material with stable thermal expansion is selected, so that the thermal compensation of the optical imaging lens is realized.
In an exemplary embodiment, the sixth lens may have positive optical power. The object-side surface of the sixth lens element may be convex, and the image-side surface of the sixth lens element may be convex. By arranging the sixth lens in the structure form, the converging of light is facilitated.
In an exemplary embodiment, the sixth lens may be configured as a cemented lens having positive optical power, specifically including one negative lens and one positive lens, and an image side surface of the negative lens may be cemented with an object side surface of the positive lens. The object side surface of the negative lens can be a convex surface, and the image side surface can be a concave surface; the object-side surface of the positive lens may be convex, and the image-side surface may be convex. By setting the sixth lens as a cemented lens, tolerance sensitivity of the optical imaging lens can be reduced, and the negative lens is made of a material with a high refractive index and a low abbe number, and the positive lens is made of a material with a low refractive index and a high abbe number, which is favorable for correcting chromatic aberration of the optical imaging lens and improving imaging quality of the optical imaging lens.
In an exemplary embodiment, the seventh lens may have negative optical power. The object-side surface of the seventh lens element may be concave, and the image-side surface may be concave. By arranging the seventh lens in the structural form, not only can the spherical aberration and the coma aberration generated by the sixth lens be compensated, but also the residual astigmatism generated by all the lenses in front can be compensated, and further the imaging quality of the optical imaging lens is improved.
In an exemplary embodiment, the eighth lens may have positive optical power. The object-side surface of the eighth lens element may be convex, and the image-side surface of the eighth lens element may be convex. By setting the eighth lens to the above-described structural form, it is advantageous to reduce the Chief Ray Angle (CRA) of the optical imaging lens so as to satisfy the CRA curve requirement of the rear chip. The CRA of the optical imaging lens may be, for example, 10 ° or less.
In an exemplary embodiment, the optical imaging lens may further include a ninth lens disposed between the object side and the first lens. The ninth lens may have negative optical power. The object-side surface of the ninth lens element may be convex, and the image-side surface thereof may be concave. By arranging the ninth lens in the above structural form, the incident angle of the light on the object side surface of the first lens can be reduced, and the light can smoothly enter the rear of the system, which is beneficial to correcting the rear group aberration. As an example, the ninth lens may be, for example, a cover glass or an integral optical architecture.
In an exemplary embodiment, the optical imaging lens may further include a diaphragm. The diaphragm may be disposed, for example, between the fourth lens and the fifth lens. All lenses between the object side and the diaphragm constitute a lens group before the diaphragm. All lenses between the image side and the diaphragm constitute a diaphragm rear lens group.
In an exemplary embodiment, the maximum light passing aperture D of the optical imaging lens and the effective focal length f9 of the ninth lens may satisfy: -1.3.ltoreq.D/f9.ltoreq.0.1. The ratio of the maximum light passing caliber of the optical imaging lens to the effective focal length of the ninth lens is reasonably configured, so that large-angle light rays can enter the system, and the angle of view of the optical imaging lens is increased. The maximum field angle FOV of the optical imaging lens may be 196 ° for example.
In an exemplary embodiment, the effective focal length f9 of the ninth lens and the total effective focal length f of the optical imaging lens may satisfy: f9/f is more than or equal to 1.3 and less than or equal to 10.8. The effective focal length value of the ninth lens is reasonably configured, so that the spherical aberration and the coma aberration of the optical imaging lens can be effectively reduced.
In an exemplary embodiment, the radius of curvature R91 of the object side surface of the ninth lens and the radius of curvature R92 of the image side surface of the ninth lens may satisfy: R91/R92 is more than or equal to 1.0 and less than or equal to 2.5. The shapes of the object side surface and the image side surface of the ninth lens are reasonably configured, so that the collection of large-angle light rays is facilitated, the large-angle light rays enter the system, and the caliber and the size of the front end of the optical imaging lens are further reduced.
In an exemplary embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens may satisfy: -9.6.ltoreq.f1/f.ltoreq.4.8. The effective focal length value of the first lens is reasonably configured, so that the first lens can play a role of diverging light, the light trend is enabled to be in stable transition, large-angle light can enter the rear lens as much as possible, and the illuminance of the optical imaging lens is improved.
In an exemplary embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens may satisfy: -4.5.ltoreq.f2/f.ltoreq.2.0. The effective focal length value of the second lens is reasonably configured, so that the second lens can play a role of diverging light, the light trend is enabled to be in stable transition, large-angle light can enter the rear lens as much as possible, and the illuminance of the optical imaging lens is improved.
In the exemplary embodiment, the effective focal length f3 of the third lens and the effective focal length fa of the pre-stop lens group may satisfy: f3/fa is less than or equal to 1.8 and less than or equal to 2.8. The ratio of the effective focal length of the third lens to the effective focal length of the lens group before the diaphragm is reasonably configured, so that the astigmatism of the whole optical imaging lens can be corrected.
In the exemplary embodiment, the effective focal length f4 of the fourth lens and the effective focal length fa of the pre-stop lens group may satisfy: -4.5.ltoreq.f4/fa.ltoreq.2.5. The ratio of the effective focal length of the fourth lens to the effective focal length of the lens group before the diaphragm is reasonably configured, so that the astigmatism of the whole optical imaging lens can be corrected.
In an exemplary embodiment, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens may satisfy: f4/f5 is more than or equal to 0.8 and less than or equal to 2.0. The effective focal length values of the fourth lens and the fifth lens are reasonably distributed, so that the aberration of the optical imaging lens in the central field area can be corrected, the thermal compensation of the optical imaging lens can be realized, and the optical imaging lens is ensured to have good temperature performance.
In an exemplary embodiment, the effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging lens may satisfy: f6/f is more than or equal to 2.2 and less than or equal to 5.2. When the sixth lens is a thick lens, the effective focal length value of the sixth lens is reasonably configured, so that astigmatism generated by the sixth lens can be avoided; when the sixth lens is a cemented lens, the effective focal length value of the sixth lens is reasonably configured, so that chromatic aberration of the optical imaging lens can be effectively corrected.
In an exemplary embodiment, the effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging lens may satisfy: -3.5.ltoreq.f7/f.ltoreq.1.5. The effective focal length value of the seventh lens is reasonably configured, so that astigmatism generated by each positive lens in the diaphragm rear group lens is balanced.
In an exemplary embodiment, the effective focal length f8 of the eighth lens and the total effective focal length f of the optical imaging lens may satisfy: f8/f is more than or equal to 2.1 and less than or equal to 3.8. And the effective focal length value of the eighth lens is reasonably configured, so that the maximum field principal ray emitted by the seventh lens is favorably turned over, and the image height of the optical imaging lens is ensured to meet the requirement.
In an exemplary embodiment, the effective focal length fa of the stop-front lens group and the total effective focal length f of the optical imaging lens may satisfy: -fa/f is less than or equal to 1.5 and less than or equal to-0.8. The effective focal length value of the lens group in front of the diaphragm is reasonably configured, so that the control of the light beam trend is facilitated, the sensitivity of the optical imaging lens is reduced, and the imaging quality of the optical imaging lens is improved.
In an exemplary embodiment, the effective focal length fb of the stop-rear lens group and the total effective focal length f of the optical imaging lens may satisfy: fb/f is more than or equal to 2.0 and less than or equal to 3.5. The effective focal length value of the lens group behind the diaphragm is reasonably configured, so that the control of the light beam trend is facilitated, the sensitivity of the optical imaging lens is reduced, and the imaging quality of the optical imaging lens is improved.
In an exemplary embodiment, the effective focal length fa of the lens group before the stop and the effective focal length fb of the lens group after the stop may satisfy: -fa/fb is less than or equal to 0.6 and less than or equal to-0.3. The effective focal length values of the lens group before the diaphragm and the lens group after the diaphragm are reasonably configured, so that the positive and negative focal powers of the lens group before the diaphragm and the lens group after the diaphragm are reasonably matched, the light trend is controlled, the light trend is more gentle, the sensitivity of the optical imaging lens is reduced, and the imaging quality of the optical imaging lens is improved.
In an exemplary embodiment, the air interval T4S of the fourth lens and the diaphragm on the optical axis and the total optical length TTL of the optical imaging lens may satisfy: T4S/TTL is more than or equal to 0 and less than or equal to 0.1. And the air interval between the fourth lens and the diaphragm on the optical axis is reasonably configured, so that smooth transition of light rays near the diaphragm is facilitated, and high resolution of the optical imaging lens is realized.
In an exemplary embodiment, the air interval T34 of the third lens and the fourth lens on the optical axis and the air interval T4S of the fourth lens and the diaphragm on the optical axis may satisfy: T34/T4S is more than or equal to 0.2 and less than or equal to 1.2. And the air interval of the third lens and the fourth lens on the optical axis and the air interval of the fourth lens and the diaphragm on the optical axis are reasonably distributed, so that the coma aberration of the optical imaging lens is corrected, and the tolerance sensitivity of the optical imaging lens is reduced.
In an exemplary embodiment, the radius of curvature R21 of the object side surface of the second lens and the radius of curvature R22 of the image side surface of the second lens may satisfy: (R21-R22)/(R21+R22) is less than or equal to 0.1 and less than or equal to 1.2. The curvature radius of the object side surface and the curvature radius of the image side surface of the second lens are reasonably configured, so that the light emitted from the second lens can be ensured to be more gentle when entering the object side surface of the third lens, and the tolerance sensitivity of the optical imaging lens is reduced.
In an exemplary embodiment, the center thickness CT4 of the fourth lens on the optical axis, the air interval T45 of the fourth lens and the fifth lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis may satisfy: T45/(CT 4+ CT 5) is less than or equal to 0 and less than or equal to 0.1. The center thickness of the fourth lens on the optical axis, the air interval of the fourth lens and the fifth lens on the optical axis and the center thickness of the fifth lens on the optical axis are reasonably configured, so that the characteristics of eliminating temperature drift of the optical imaging lens can be better realized, and the coma aberration, astigmatism and other off-axis aberration of the optical imaging lens can be effectively corrected.
In an exemplary embodiment, the maximum field angle FOV of the optical imaging lens, the image height H of the optical imaging lens at the maximum field angle, and the maximum light passing aperture D of the optical imaging lens may satisfy: FOV/H/D is less than or equal to 1.5 and less than or equal to 2.8. The maximum field angle, the image height and the maximum light-transmitting aperture of the optical imaging lens are reasonably configured, the viewpoint position of the optical imaging lens can be effectively controlled, the light-transmitting aperture is ensured to meet the design requirement, and the shorter the focal length is, the larger the field angle is, and the smaller the opposite is; meanwhile, the optical imaging lens can have a reasonable field angle when corresponding to different sensors.
In an exemplary embodiment, the total effective focal length f of the optical imaging lens and the entrance pupil diameter ENPD of the optical imaging lens may satisfy: f/ENPD is more than or equal to 1.6 and less than or equal to 1.9. The ratio of the total effective focal length of the optical imaging lens to the entrance pupil diameter of the optical imaging lens is reasonably configured, so that the large aperture of the optical imaging lens is realized, the light flux of the optical imaging lens is increased, and the imaging brightness and contrast of the optical imaging lens are improved.
In an exemplary embodiment, the maximum light transmission aperture D8 of the eighth lens and the image height H of the optical imaging lens at the maximum field angle may satisfy: D8/H is more than or equal to 0.2 and less than or equal to 1.5. The ratio of the maximum light transmission caliber of the eighth lens to the image height of the optical imaging lens at the maximum field angle is reasonably configured, so that light rays emitted from the eighth lens can be smoothly transited to an image plane, the inclination angle (CRA) of principal rays is reduced, and the tolerance and manufacturability of the optical imaging lens are improved.
In an exemplary embodiment, the back focal length BFL of the optical imaging lens and the total optical length TTL of the optical imaging lens may satisfy: BFL/TTL is more than or equal to 0.05 and less than or equal to 0.2. The ratio of the back focal length of the optical imaging lens to the total optical length of the optical imaging lens is reasonably configured, so that the miniaturization of the optical imaging lens is facilitated, and the ghost image energy generated by the reflection between the optical imaging lens and the center of the optical filter is reduced.
The optical imaging lens according to the above embodiment of the present application may employ a plurality of lenses, for example, the above nine lenses, and at least one of a large field of view, a large aperture, high resolution, miniaturization, high and low temperature non-virtual focus of the optical imaging lens can be realized by reasonably distributing optical parameters such as optical power of each lens, surface thickness of each lens, and on-axis spacing between each lens. The optical imaging lens provided by the application can be an optical imaging lens with a maximum field angle fov=196°, a relative F number FNO less than or equal to 1.8 and twenty-five million pixels.
In an embodiment of the present application, at least one of the mirror surfaces of each of the first to ninth lenses is an aspherical mirror surface. The aspherical 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 a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality.
However, those skilled in the art will appreciate that the various results and advantages described in this specification can be obtained by changing the number of lenses making up an optical imaging lens without departing from the technical solution claimed in the present application.
Specific examples of the optical imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1. Fig. 1 is a schematic structural diagram of an optical imaging lens according to embodiment 1 of the present application.
As shown in fig. 1, the optical imaging lens 100 includes, in order from an object side to an image side along an optical axis: a ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5.
The ninth lens element L9 has negative refractive power, wherein an object-side surface S1 thereof is convex and an image-side surface S2 thereof is concave. The first lens element L1 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The third lens element L3 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fourth lens element L4 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The fifth lens element L5 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The sixth lens element L6 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The seventh lens element L7 has negative refractive power, wherein an object-side surface S15 thereof is concave, and an image-side surface S16 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S17 thereof is convex, and an image-side surface S18 thereof is convex. The filter C has an object side surface S19 and an image side surface S20. Light from the object passes sequentially through the respective surfaces S1 to S20 and is finally imaged on the imaging plane IMA. The surfaces S1 to S20 are not shown in fig. 1.
Table 1 shows a basic parameter table of the optical imaging lens 100 of embodiment 1, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 1
In embodiment 1, the object side surface and the image side surface of any one of the second lens L2 to the fourth lens L4, the sixth lens L6 to the eighth lens L8 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 2 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S5-S10, S13-S18 of example 1 4 、A 6 、A 8 、A 10 And A 12 。
Face number k A4 A6 A8 A10 A12
S5 0 5.46E-04 -7.69E-04 9.50E-05 -5.23E-06 1.20E-07
S6 -2.029 5.24E-02 -7.75E-03 4.75E-04 7.05E-05 -1.76E-05
S7 0 -2.81E-03 -7.40E-04 6.40E-04 -1.50E-05 -7.56E-06
S8 0 -8.93E-03 5.06E-03 9.15E-04 1.94E-04 5.06E-05
S9 -1.779 -1.03E-03 2.45E-03 7.62E-04 1.92E-05 -1.59E-05
S10 0 1.00E-02 -1.61E-03 1.84E-03 -8.47E-04 2.28E-04
S13 0 5.74E-04 -1.77E-03 5.51E-04 -7.61E-05 -4.68E-05
S14 0 -1.42E-02 6.08E-03 -3.30E-03 4.54E-04 3.54E-06
S15 0 -1.73E-02 5.70E-03 -4.25E-03 8.36E-04 -1.00E-05
S16 0 -8.28E-03 2.07E-03 -6.21E-04 1.79E-04 -9.18E-06
S17 0 -2.06E-02 1.50E-03 -1.60E-04 -2.61E-05 -7.65E-07
S18 0 8.33E-03 -2.15E-03 3.96E-04 -8.10E-05 3.35E-06
TABLE 2
Example 2
An optical imaging lens according to embodiment 2 of the present application is described below with reference to fig. 2. Fig. 2 is a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present application.
As shown in fig. 2, the optical imaging lens 200 includes, in order from an object side to an image side along an optical axis: a ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5.
The ninth lens element L9 has negative refractive power, wherein an object-side surface S1 thereof is convex and an image-side surface S2 thereof is concave. The first lens element L1 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The third lens element L3 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fourth lens element L4 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The fifth lens element L5 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The sixth lens element L6 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The seventh lens element L7 has negative refractive power, wherein an object-side surface S15 thereof is concave, and an image-side surface S16 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S17 thereof is convex, and an image-side surface S18 thereof is convex. The filter C has an object side surface S19 and an image side surface S20. Light from the object passes sequentially through the respective surfaces S1 to S20 and is finally imaged on the imaging plane IMA. The surfaces S1 to S20 are not shown in fig. 1.
Table 3 shows a basic parameter table of the optical imaging lens 200 of embodiment 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 3 Table 3
In embodiment 2, the object side surface and the image side surface of any one of the second lens L2 to the fourth lens L4, the fifth lens L5, the seventh lens L7, and the eighth lens L8 are aspherical surfaces. Table 4 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S5-S10, S11-S12, S15-S18 used in example 2 4 、A 6 、A 8 、A 10 And A 12 。
Face number k A4 A6 A8 A10 A12
S5 0 -7.20E-03 -5.45E-04 1.06E-04 -6.16E-06 1.15E-07
S6 -1.587 2.16E-02 -2.91E-03 6.61E-04 -1.64E-04 2.29E-05
S7 0.854 -5.35E-04 -3.42E-03 5.50E-04 5.07E-05 -6.93E-06
S8 -7.314 7.03E-03 2.75E-03 -6.70E-04 -1.60E-04 4.65E-05
S9 -5.790 1.10E-03 5.35E-03 -2.00E-03 1.90E-04 -2.10E-05
S10 0 1.11E-03 4.61E-03 -2.22E-03 9.67E-05 -1.85E-06
S11 1.161 5.14E-03 4.58E-03 -1.33E-03 -5.33E-05 3.65E-05
S12 -0.178 7.32E-03 2.27E-03 -9.92E-04 8.43E-04 -1.70E-04
S15 -3.814 -3.81E-03 -3.05E-03 7.82E-06 2.15E-04 -5.10E-05
S16 0.158 -8.31E-03 6.20E-04 3.79E-04 -1.69E-04 1.27E-05
S17 -0.506 -1.92E-02 3.90E-03 -3.04E-04 -1.79E-05 8.03E-07
S18 0.986 1.75E-03 4.11E-05 1.10E-04 -4.96E-06 -5.66E-07
TABLE 4 Table 4
Example 3
An optical imaging lens according to embodiment 3 of the present application is described below with reference to fig. 3. Fig. 3 is a schematic structural diagram of an optical imaging lens according to embodiment 3 of the present application.
As shown in fig. 3, the optical imaging lens 300 includes, in order from an object side to an image side along an optical axis: a ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5.
The ninth lens element L9 has negative refractive power, wherein an object-side surface S1 thereof is convex and an image-side surface S2 thereof is concave. The first lens element L1 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The third lens element L3 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fourth lens element L4 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The fifth lens element L5 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The sixth lens element L6 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The seventh lens element L7 has negative refractive power, wherein an object-side surface S15 thereof is concave, and an image-side surface S16 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S17 thereof is convex, and an image-side surface S18 thereof is convex. The filter C has an object side surface S19 and an image side surface S20. Light from the object passes sequentially through the respective surfaces S1 to S20 and is finally imaged on the imaging plane IMA. The surfaces S1 to S20 are not shown in fig. 1.
Table 5 shows a basic parameter table of the optical imaging lens 300 of embodiment 3, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
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TABLE 5
In embodiment 3, the object side surface and the image side surface of any one of the second lens L2 to the fourth lens L4, the fifth lens L5, the seventh lens L7, and the eighth lens L8 are aspherical surfaces. Table 6 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S5-S10, S11-S12, S15-S18 used in example 3 4 、A 6 、A 8 、A 10 And A 12 。
Face number k A4 A6 A8 A10 A12
S5 0 -2.46E-03 -3.66E-04 8.75E-05 -6.22E-06 1.31E-07
S6 -0.909 1.72E-03 -9.25E-05 -6.66E-05 8.04E-05 4.39E-06
S7 -0.960 2.55E-03 4.10E-04 -1.25E-04 7.64E-05 -8.71E-06
S8 -26.870 1.85E-02 1.02E-03 -1.29E-03 5.25E-04 3.66E-05
S9 -10.497 1.29E-02 -1.45E-03 -9.86E-04 4.75E-04 -9.86E-06
S10 0 -2.23E-02 1.32E-02 -2.90E-03 8.83E-05 1.71E-05
S11 -35 -7.41E-04 5.99E-03 4.04E-04 -4.79E-04 7.67E-05
S12 1.127 2.26E-03 3.73E-03 -1.54E-03 7.59E-04 -8.13E-05
S15 -3.720 6.26E-06 -1.56E-03 -1.25E-04 3.93E-06 2.95E-06
S16 0.509 -2.73E-03 1.98E-03 -2.75E-04 -1.18E-04 1.79E-05
S17 -0.696 -1.82E-02 3.29E-03 -4.94E-04 5.94E-05 -6.42E-06
S18 2.856 -6.06E-04 -1.13E-03 1.58E-04 1.12E-05 -2.37E-06
TABLE 6
Example 4
An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 4. Fig. 4 is a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present application.
As shown in fig. 4, the optical imaging lens 400 includes, in order from an object side to an image side along an optical axis: a ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens, a seventh lens L7, and an eighth lens L8. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5.
The ninth lens element L9 has negative refractive power, wherein an object-side surface S1 thereof is convex and an image-side surface S2 thereof is concave. The first lens element L1 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The third lens element L3 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fourth lens element L4 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The fifth lens element L5 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The sixth lens is a cemented lens including a negative lens L61 and a positive lens L62; the object side surface S13 of the negative lens L61 is convex, and the image side surface S14 is concave; the object side surface of the positive lens L62 is convex, and the image side surface S15 is convex. The seventh lens element L7 has negative refractive power, wherein an object-side surface S16 thereof is concave, and an image-side surface S17 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S18 thereof is convex, and an image-side surface S19 thereof is convex. The filter C has an object side surface S20 and an image side surface S21. Light from the object passes sequentially through the respective surfaces S1 to S21 and is finally imaged on the imaging plane IMA. The surfaces S1 to S21 are not shown in fig. 1.
Table 7 shows a basic parameter table of the optical imaging lens 400 of embodiment 4, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 7
In embodiment 4, the second to fourth lenses L2 to L4, the fifth lens L5, and the seventh lensThe object side surface and the image side surface of either one of the lens L7 and the eighth lens L8 are aspherical surfaces. Table 8 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S5-S10, S11-S12, S16-S19 used in example 4 4 、A 6 、A 8 、A 10 And A 12 。
Face number k A4 A6 A8 A10 A12
S5 0 4.04E-03 -6.01E-04 7.15E-05 -4.16E-06 9.68E-08
S6 -1.827 1.15E-02 1.32E-03 -6.68E-04 1.31E-04 7.25E-06
S7 0.123 -1.41E-03 2.52E-03 -4.68E-04 9.01E-05 -8.89E-06
S8 -13.893 3.07E-02 -1.73E-03 -9.78E-05 9.00E-05 5.01E-05
S9 -4.964 1.61E-02 -7.71E-04 -7.05E-04 2.03E-04 -8.17E-07
S10 0 -1.11E-02 1.50E-02 -3.88E-03 2.39E-04 2.80E-05
S11 -30.210 7.67E-03 2.08E-03 2.61E-04 -4.17E-04 5.74E-05
S12 0.326 5.76E-04 2.64E-03 -1.37E-03 5.03E-04 -6.84E-05
S16 -9.044 1.04E-04 -1.33E-03 2.18E-05 -7.18E-05 1.55E-06
S17 0.212 -6.72E-03 1.59E-03 -1.23E-04 -1.07E-04 1.26E-05
S18 -0.782 -1.94E-02 3.60E-03 -4.81E-04 4.84E-05 -3.33E-06
S19 1.775 1.24E-02 -2.61E-03 2.35E-04 2.86E-06 1.05E-06
TABLE 8
Example 5
An optical imaging lens according to embodiment 5 of the present application is described below with reference to fig. 5. Fig. 5 is a schematic structural diagram of an optical imaging lens according to embodiment 5 of the present application.
As shown in fig. 5, the optical imaging lens 500 includes, in order from an object side to an image side along an optical axis: a ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens, a seventh lens L7, and an eighth lens L8. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5.
The ninth lens element L9 has negative refractive power, wherein an object-side surface S1 thereof is convex and an image-side surface S2 thereof is concave. The first lens element L1 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The third lens element L3 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fourth lens element L4 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The fifth lens element L5 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The sixth lens is a cemented lens including a negative lens L61 and a positive lens L62; the object side surface S13 of the negative lens L61 is convex, and the image side surface S14 is concave; the object side surface of the positive lens L62 is convex, and the image side surface S15 is convex. The seventh lens element L7 has negative refractive power, wherein an object-side surface S16 thereof is concave, and an image-side surface S17 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S18 thereof is convex, and an image-side surface S19 thereof is convex. The filter C has an object side surface S20 and an image side surface S21. Light from the object passes sequentially through the respective surfaces S1 to S21 and is finally imaged on the imaging plane IMA. The surfaces S1 to S21 are not shown in fig. 1.
Table 9 shows a basic parameter table of the optical imaging lens 500 of embodiment 5, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
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TABLE 9
In embodiment 5, the object side surface and the image side surface of any one of the second lens L2, the third lens L3, the fifth lens L5, the seventh lens L7, and the eighth lens L8 are aspherical surfaces. Table 10 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S5-S8, S11-S12, S16-S19 used in example 5 4 、A 6 、A 8 、A 10 And A 12 。
Face number k A4 A6 A8 A10 A12
S5 0 -1.69E-03 -5.17E-04 7.73E-05 -4.06E-06 7.78E-08
S6 -1.499 1.07E-02 -8.33E-04 -8.30E-04 1.98E-04 -7.09E-06
S7 -0.064 -5.71E-04 2.95E-03 -6.03E-04 7.11E-05 -4.60E-06
S8 -9.016 3.13E-02 -1.53E-03 4.00E-04 -1.26E-04 7.43E-06
S11 -7.397 9.81E-03 1.33E-03 8.91E-05 -8.25E-06 6.56E-05
S12 -0.859 2.64E-03 3.81E-03 -1.23E-03 4.31E-04 4.00E-05
S16 -7.892 3.79E-05 -1.75E-03 -2.42E-05 -2.39E-05 1.68E-05
S17 0.134 -7.86E-03 1.60E-03 -5.06E-05 -8.95E-05 1.39E-05
S18 -0.997 -2.08E-02 3.70E-03 -4.48E-04 5.62E-05 -4.62E-06
S19 1.549 1.01E-02 -2.45E-03 3.25E-04 7.12E-06 -3.92E-07
Table 10
In summary, the conditional expressions in embodiment 1 to embodiment 5 satisfy the relationship shown in table 11.
TABLE 11
The present application also provides an imaging device whose electronic photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS), the imaging device being equipped with the above-described optical imaging lens.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (10)

1. The optical imaging lens is characterized by comprising, in order from an object side to an image side along an optical axis:
the first lens is provided with negative 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;
a second lens having negative optical power;
the third lens is provided with negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
a fourth lens having positive optical power;
a fifth lens having positive optical power;
a sixth lens having positive optical power;
a seventh lens having negative optical power; and
and an eighth lens having positive optical power.
2. The optical imaging lens of claim 1, further comprising a ninth lens having negative optical power and disposed between the object side and the first lens.
3. The optical imaging lens as claimed in claim 2, wherein a maximum light passing aperture D of the optical imaging lens and an effective focal length f9 of the ninth lens satisfy: -1.3.ltoreq.D/f9.ltoreq.0.1.
4. The optical imaging lens of claim 2, wherein a radius of curvature R91 of an object side surface of the ninth lens and a radius of curvature R92 of an image side surface of the ninth lens satisfy: R91/R92 is more than or equal to 1.0 and less than or equal to 2.5.
5. The optical imaging lens according to claim 1 or 2, further comprising a stop, and the effective focal length f3 of the third lens and the effective focal length fa of the lens group before the stop satisfy: f3/fa is less than or equal to 1.8 and less than or equal to 2.8.
6. The optical imaging lens according to claim 1 or 2, further comprising a stop, and the effective focal length f4 of the fourth lens and the effective focal length fa of the lens group before the stop satisfy: -4.5.ltoreq.f4/fa.ltoreq.2.5.
7. The optical imaging lens according to claim 1 or 2, further comprising a stop, and the effective focal length fa of the lens group before the stop and the effective focal length fb of the lens group after the stop satisfy: -fa/fb is less than or equal to 0.6 and less than or equal to-0.3.
8. The optical imaging lens according to claim 1 or 2, further comprising a diaphragm, and an air interval T4S of the fourth lens and the diaphragm on the optical axis and an optical total length TTL of the optical imaging lens satisfy: T4S/TTL is more than or equal to 0 and less than or equal to 0.1.
9. The optical imaging lens according to claim 1 or 2, wherein a center thickness CT4 of the fourth lens on the optical axis, an air interval T45 of the fourth lens and the fifth lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy: T45/(CT 4+ CT 5) is less than or equal to 0 and less than or equal to 0.1.
10. The optical imaging lens according to claim 1 or 2, wherein a maximum field angle FOV of the optical imaging lens, an image height H of the optical imaging lens at the maximum field angle, and a maximum light passing aperture D of the optical imaging lens satisfy: FOV/H/D is less than or equal to 1.5 and less than or equal to 2.8.
CN202310590452.9A 2023-05-23 2023-05-23 Optical imaging lens Pending CN116661108A (en)

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