CN220271649U - Fixed focus lens - Google Patents
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- CN220271649U CN220271649U CN202321609052.XU CN202321609052U CN220271649U CN 220271649 U CN220271649 U CN 220271649U CN 202321609052 U CN202321609052 U CN 202321609052U CN 220271649 U CN220271649 U CN 220271649U
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Abstract
The application discloses a fixed focus lens, which sequentially comprises a first lens with negative focal power from an object side to an image side along an optical axis, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; and the fifth lens with negative focal power has a concave object side surface and a concave image side surface. The radius of curvature R31 of the object side surface of the third lens, the radius of curvature R32 of the image side surface of the third lens, and the radius of curvature R22 of the image side surface of the second lens satisfy: and R < 31+R32)/R < 22 > is more than or equal to 3.73 and less than or equal to 5.16.
Description
Technical Field
The present application relates to the field of optical elements, and more particularly, to a fixed focus lens.
Background
In recent years, optical lens technology has been rapidly advanced, and plays an important role in more and more fields. With the continuous upgrading development of internet technology, video shots are widely applied to the fields of video conferences, online teaching, network video shooting and the like, and are more and more valued by the masses, so that the requirements on the image quality of the video shots are higher and higher.
However, the video conference lens in the current market still has a plurality of defects, for example, the configuration of the video conference lens in the current market is difficult to correct the system aberration, and the imaging quality is poor; the problems of overlong total length and larger volume of the lens generally exist, so that the overall cost and the weight of the lens are overhigh; moreover, the existing video conference lens often has the problem that the lens distortion management and control is not good enough, so that the shot picture is obviously deformed, and the processing of the later-stage image is affected.
Therefore, designing a fixed focus lens with low distortion, small volume, high resolution and low cost becomes a necessary trend of market development.
Disclosure of Invention
The application provides a fixed focus lens, this fixed focus lens can include in order from the object side to the image side along the optical axis: the first lens with negative focal power has a convex object side surface and a concave image side surface; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; and the fifth lens with negative focal power has a concave object side surface and a concave image side surface. The radius of curvature R31 of the object-side surface of the third lens, the radius of curvature R32 of the image-side surface of the third lens, and the radius of curvature R22 of the image-side surface of the second lens may satisfy: and R < 31+R32)/R < 22 > is more than or equal to 3.73 and less than or equal to 5.16.
In one embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the fixed focus lens may satisfy: -2.03.ltoreq.F1/F.ltoreq.1.95.
In one embodiment, the radius of curvature R11 of the object side surface of the first lens and the effective focal length F1 of the first lens may satisfy: R11/F1 is less than or equal to-1.49 and less than or equal to-1.05.
In one embodiment, the radius of curvature R11 of the object side surface of the first lens, the radius of curvature R12 of the image side surface of the first lens, and the center thickness CT1 of the first lens on the optical axis may satisfy: (R11+R12)/CT 1 is more than or equal to 9.79 and less than or equal to 11.91.
In one embodiment, the effective focal length F2 of the second lens and the total effective focal length F of the fixed focus lens may satisfy: -61 is less than or equal to F2/F is less than or equal to-48.
In one embodiment, the combined focal length F12 of the first lens and the second lens and the total effective focal length F of the fixed focus lens may satisfy: -2.30-2.21 and F12/F-2.
In one embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the fixed focus lens may satisfy: F3/F is less than or equal to 1.51 and less than or equal to 1.62.
In one embodiment, the radius of curvature R22 of the image side of the second lens, the radius of curvature R31 of the object side of the third lens, the radius of curvature R32 of the image side of the third lens, and the combined focal length F23 of the second lens and the third lens may satisfy: -3.63 < (R22+R31+R32)/F23 < 2.58.
In one embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the fixed focus lens may satisfy: F4/F is less than or equal to 1.00 and less than or equal to 1.05.
In one embodiment, the radius of curvature R41 of the object side surface of the fourth lens, the radius of curvature R42 of the image side surface of the fourth lens, and the center thickness CT4 of the fourth lens on the optical axis may satisfy: (R41+R42)/CT 4 is more than or equal to 0.017 and less than or equal to 0.160.
In one embodiment, the effective focal length F5 of the fifth lens and the total effective focal length F of the fixed focus lens may satisfy: F5/F is less than or equal to-1.13 and less than or equal to-1.11.
In one embodiment, the combined focal length F45 of the fourth lens and the fifth lens and the total effective focal length F of the fixed focus lens may satisfy: F45/F is less than or equal to 3.89 and less than or equal to 4.80.
In one 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: -0.10 < ltoreq.R 21-R22)/(R21+R22) < 0.09.
In one embodiment, a center thickness CT3 of the third lens element on the optical axis, a center thickness CT4 of the fourth lens element on the optical axis, and a center distance T34 between an object side surface of the third lens element and an image side surface of the fourth lens element on the optical axis may satisfy: (CT3+CT4)/T34 is more than or equal to 0.90 and less than or equal to 0.92.
In one embodiment, the combined focal length F345 of the third lens, the fourth lens and the fifth lens and the total effective focal length F of the fixed focus lens may satisfy: F345/F is less than or equal to 1.04 and less than or equal to 1.06.
In one embodiment, a maximum value CTmax in the center thickness of each of the first to fifth lenses on the optical axis and a minimum value CTmin in the center thickness of each of the first to fifth lenses on the optical axis may satisfy: CTmax/CTmin is less than or equal to 2.69 and less than or equal to 3.33.
In one embodiment, the abbe number Vd2 of the second lens, the abbe number Vd3 of the third lens, and the total effective focal length F of the fixed focus lens may satisfy: 13.88mm -1 ≤(Vd2+Vd3)/F≤14.02mm -1 。
In one embodiment, a distance TTL between a center of an object side surface of the first lens and an imaging surface of the fixed focus lens on the optical axis and a total effective focal length F of the fixed focus lens may satisfy: TTL/F is less than or equal to 3.00 and less than or equal to 3.08.
In one embodiment, a distance BFL between a center of an image side surface of the fifth lens element and an imaging surface of the fixed focus lens element on the optical axis and a distance TTL between a center of an object side surface of the first lens element and the imaging surface on the optical axis may satisfy: BFL/TTL is more than or equal to 0.37 and less than or equal to 0.39.
The fixed focus lens comprises first to fifth lenses which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens has negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the third lens has positive focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the fourth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface; the fifth lens has negative focal power, the object side surface is a concave surface, and the image side surface is a concave surface; the radius of curvature R31 of the object side surface and the radius of curvature R32 of the image side surface of the third lens and the radius of curvature R22 of the image side surface of the second lens are controlled to satisfy the condition that (R31+R32)/R22 is less than or equal to 3.73 and less than or equal to 5.16. By such arrangement of the fixed focus lens, the lens can be made to have at least one of the beneficial effects of low distortion, miniaturization, low cost, high resolution, and the like.
Drawings
Other features, objects, and advantages of the present application will become more apparent from the following detailed description of the embodiments, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a schematic structural view of a fixed focus lens according to embodiment 1 of the present application;
FIG. 2 is a graph of distortion of a fixed focus lens according to embodiment 1 of the present application;
fig. 3 is a schematic structural view of a fixed focus lens according to embodiment 2 of the present application;
fig. 4 is a distortion graph of a fixed focus lens according to embodiment 2 of the present application;
fig. 5 is a schematic structural view of a fixed focus lens according to embodiment 3 of the present application;
FIG. 6 is a graph of distortion of a fixed focus lens according to example 3 of the present application;
fig. 7 is a schematic structural diagram of a fixed focus lens according to embodiment 4 of the present application; and
fig. 8 is a distortion graph of a fixed focus lens according to embodiment 4 of the present application.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in 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. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, 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 subject is referred to as the object side of the lens, and the surface of each lens closest to the imaging side 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
In an exemplary embodiment, the optical lens includes, for example, five lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged in order from the object side to the image side along the optical axis.
In an exemplary embodiment, the first lens may have negative optical power; the second lens may have negative optical power; the third lens may have positive optical power; the fourth lens may have positive optical power; the fifth lens may have negative optical power.
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 may be concave. The first lens has negative focal power, the lens is in a meniscus shape with a convex surface facing the object, more incident light rays with a field of view can be converged into the optical system as much as possible, and the angle of view of the optical system is enlarged; meanwhile, the spherical aberration, the coma aberration and the astigmatism of the optical system can be effectively balanced, and the imaging quality of the optical system is improved; the optical distortion can be effectively corrected, for example, the absolute value of the optical distortion is less than or equal to 2.20%, the deformation degree of the image is greatly reduced, and the authenticity of the photographed object is effectively restored.
In an exemplary embodiment, the second lens may have negative optical power. The object-side surface of the second lens element may be concave, and the image-side surface may be convex. The second lens has negative focal power, and the lens is in a meniscus shape with the convex surface facing the image space, so that the trend of light rays can be effectively controlled, the light rays are lifted, the spherical aberration generated by the first lens is effectively balanced, and the imaging quality is improved; meanwhile, the optical distortion of the edge view field of the imaging system is effectively regulated and controlled, and the distortion amount of the edge view field is favorably controlled in a reasonable range.
In an exemplary embodiment, the third lens may have positive optical power. The object-side surface of the third lens element may be concave, and the image-side surface thereof may be convex. The third lens has positive focal power, the lens shape is concave-convex, the trend of light is controlled, the smooth transition of light is realized by compressing the angle of incident light, and meanwhile, the spherical aberration generated by each lens of the optical system is effectively balanced by introducing positive spherical aberration, so that the imaging performance of the optical system is greatly improved.
In an exemplary embodiment, the third lens may be a glass spherical lens, which is helpful to inhibit focal drift of the lens in high and low temperature environments, so as to achieve higher imaging quality of the lens in a larger temperature range (for example, -20 ℃ to 60 ℃).
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 convex image-side surface. The fourth lens has positive focal power, the lens shape is convex, the trend of light can be effectively controlled, the light can be smoothly transited to the rear of the optical system, the spherical aberration of the optical system can be corrected, the influence of the curvature of field and the coma aberration of the fourth lens on the optical lens can be effectively reduced, and the imaging performance of the optical system is greatly improved.
In an exemplary embodiment, the fifth lens may have negative optical power. The object-side surface of the fifth lens element may be concave, and the image-side surface thereof may be concave. The fifth lens has negative focal power, the lens shape is concave, the positive and negative focal power of the fifth lens can be reasonably matched with that of the fourth lens, and meanwhile, the lens shape of the fifth lens can be reasonably configured with that of the third lens, so that the trend of light rays passing through a diaphragm can be effectively controlled, the spherical aberration, the coma aberration and the astigmatism generated by an optical system are balanced, and the imaging performance of the optical system is greatly improved; meanwhile, the optical distortion can be effectively corrected, for example, the absolute value of the optical distortion is less than or equal to 2.20%, the deformation degree of the image is greatly reduced, and the authenticity of the photographed object is effectively restored.
In an exemplary embodiment, the fixed focus lens according to the present application may further include a diaphragm, for example, the diaphragm may be located between the second lens and the third lens, and may effectively collect light entering the optical system, shorten the total length of the optical system, reduce the maximum light-transmitting aperture of the optical system, and facilitate the miniaturization design of the optical lens. It should be noted that the positions of the diaphragms disclosed herein are merely examples and are not limiting; in alternative embodiments, the diaphragm may be arranged in other positions as desired.
In an exemplary embodiment, the fixed focus lens may further include a photosensitive element disposed on the imaging surface. Alternatively, the photosensitive element provided to the imaging surface may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).
In an exemplary embodiment, each lens included in the fixed focus lens may have an aspherical lens therein. For example, in one embodiment, the first lens, the second lens, the fourth lens, and the fifth lens may be lenses having aspherical surfaces.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: 3.73-5.16 (R31+R32)/R22, wherein R31 is the radius of curvature of the object side of the third lens, R32 is the radius of curvature of the image side of the third lens, and R22 is the radius of curvature of the image side of the second lens. The ratio of the sum of the curvature radius of the object side surface of the third lens and the curvature radius of the image side surface of the third lens to the curvature radius of the image side surface of the second lens is controlled within the range, so that the optical imaging system can have a larger entrance pupil diameter, the maximum light flux is ensured, and the relative illumination of the optical system is improved; meanwhile, under the condition of meeting the requirements of high resolution and illumination, the lens shape of the third lens is reasonably controlled, so that the thickness of the center of the third lens reaches the minimum value, and the design of miniaturization of an optical system is facilitated.
The fixed focus lens of the exemplary embodiment of the present application comprises first to fifth lenses sequentially arranged from an object side to an image side along an optical axis, wherein the first lens has negative focal power, the object side is a convex surface, and the image side is a concave surface; the second lens has negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the third lens has positive focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the fourth lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface; the fifth lens has negative focal power, the object side surface is a concave surface, and the image side surface is a concave surface; the radius of curvature R31 of the object side surface and the radius of curvature R32 of the image side surface of the third lens and the radius of curvature R22 of the image side surface of the second lens are controlled to satisfy the condition that (R31+R32)/R22 is less than or equal to 3.73 and less than or equal to 5.16. By such arrangement of the fixed focus lens, the lens can be made to have at least one of the advantageous effects of low distortion, miniaturization, low cost, high resolution, and high relative illuminance.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: -2.03.ltoreq.F1/F.ltoreq.1.95, wherein F1 is the effective focal length of the first lens and F is the total effective focal length of the fixed focus lens. The ratio of the effective focal length of the first lens to the total effective focal length of the fixed focus lens is controlled within the range, so that spherical aberration, coma aberration and astigmatism generated by incident light entering the optical system can be balanced, and the imaging quality of the optical system can be improved.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: -1.49.ltoreq.R11/F1.ltoreq.1.05, wherein R11 is the radius of curvature of the object side of the first lens and F1 is the effective focal length of the first lens. The ratio of the curvature radius of the object side surface of the first lens to the effective focal length of the first lens is controlled within the range, so that the lens shape of the object side surface of the first lens is controlled, more view rays are converged into the optical system, and the view angle of the optical system is effectively enlarged.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: 9.79.ltoreq.R11+R12)/CT 1.ltoreq.11.91, where R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, and CT1 is the center thickness of the first lens on the optical axis. The ratio of the sum of the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the first lens to the central thickness of the first lens on the optical axis is controlled within the range, so that the lens shape of the first lens is restrained, the lens shape of the first lens is prevented from being excessively bent, and the processing and forming of the first lens are facilitated.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: -61.ltoreq.F2/F.ltoreq.48, wherein F2 is the effective focal length of the second lens and F is the total effective focal length of the fixed focus lens. The ratio of the effective focal length of the second lens to the total effective focal length of the fixed focus lens is controlled within the range, so that the trend of light rays is controlled, the light rays are lifted, the spherical aberration generated by the first lens is effectively corrected, and the imaging quality is improved.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: -2.30.ltoreq.F12/F.ltoreq.2.21, wherein F12 is the combined focal length of the first lens and the second lens, and F is the total effective focal length of the fixed focus lens. The ratio of the combined focal length of the first lens and the second lens to the total effective focal length of the fixed-focus lens is controlled within the range, so that the off-axis aberration of the optical system can be corrected, the optical distortion of the edge view field of the imaging system can be effectively regulated and controlled, the distortion amount of the edge view field can be controlled within a reasonable range, for example, the absolute value of the optical distortion is less than or equal to 2.20%, the deformation degree of an image is greatly reduced, and the authenticity of a photographed object is effectively restored.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: F3/F is less than or equal to 1.51 and less than or equal to 1.62, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the fixed focus lens. The ratio of the effective focal length of the third lens to the total effective focal length of the fixed focus lens is controlled within the range, so that the trend of light is controlled, the smooth transition of light is realized by compressing the angle of incident light on the object side surface of the third lens, and meanwhile, the spherical aberration generated by each lens of the optical system is effectively balanced by introducing positive spherical aberration, and the imaging performance of the optical system is greatly improved.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: -3.63 +.ltoreq.R22+R31+R32)/F23 +.2.58, where R22 is the radius of curvature of the image side of the second lens, R31 is the radius of curvature of the object side of the third lens, R32 is the radius of curvature of the image side of the third lens, and F23 is the combined focal length of the second lens and the third lens. The curvature radius of the image side surface of the second lens, the curvature radius of the object side surface of the third lens, the curvature radius of the image side surface of the third lens and the combined focal length of the second lens and the third lens meet the condition that R < 22 > +R31+R32)/F23 is less than or equal to-2.58, so that smooth transition of light rays from the image side surface of the second lens to the object side surface of the third lens after passing through a diaphragm is facilitated, the deflection angles of marginal light rays in the second lens and the third lens are effectively reduced, and the imaging quality of a marginal view field is improved; meanwhile, the optical imaging system can be effectively enabled to have a larger entrance pupil diameter, the maximum light flux is ensured, and the relative illumination of the optical system is improved.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: F4/F is more than or equal to 1.00 and less than or equal to 1.05, wherein F4 is the effective focal length of the fourth lens, and F is the total effective focal length of the fixed focus lens. The ratio of the effective focal length of the fourth lens to the total effective focal length of the fixed focus lens is controlled within the range, so that spherical aberration generated by the first lens to the third lens of the optical system can be corrected, and the imaging quality of the optical system can be improved.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: (R41+R42)/CT 4 is more than or equal to 0.017 and less than or equal to 0.160, wherein R41 is the radius of curvature of the object side surface of the fourth lens, R42 is the radius of curvature of the image side surface of the fourth lens, and CT4 is the center thickness of the fourth lens on the optical axis. By controlling the ratio of the sum of the curvature radius of the object side surface of the fourth lens to the curvature radius of the image side surface of the fourth lens to the central thickness of the fourth lens on the optical axis within the range, the trend of light rays can be effectively controlled, the deflection angle of the incident light rays and the emergent light rays of the fourth lens can be slowed down, the light rays can smoothly enter the rear of the optical system, the tolerance sensitivity of the fourth lens is reduced, and the improvement of the lens assembly yield is facilitated.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: -1.13.ltoreq.F5/F.ltoreq.1.11, wherein F5 is the effective focal length of the fifth lens and F is the total effective focal length of the fixed focus lens. By controlling the ratio of the effective focal length of the fifth lens to the total effective focal length of the fixed focus lens in the range, the trend of light can be effectively controlled, so that the light is smoothly transited from the fifth lens to the imaging surface, various aberrations such as astigmatism, coma aberration and spherical aberration generated by the optical system are corrected, the imaging performance of the optical system is greatly improved, meanwhile, the optical distortion can be effectively corrected, for example, the absolute value of the optical distortion is less than or equal to 2.20%, the deformation degree of an image is greatly reduced, and the authenticity of a photographed object is effectively restored.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: F45/F is more than or equal to 3.89 and less than or equal to 4.80, wherein F45 is the combined focal length of the fourth lens and the fifth lens, and F is the total effective focal length of the fixed focus lens. By controlling the ratio of the combined focal length of the fourth lens and the fifth lens to the total effective focal length of the fixed-focus lens in the range, the spherical aberration of the optical system can be effectively corrected, and the optical imaging performance can be improved.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: -0.10 +.ltoreq.R21-R22)/(R21+R22) +.ltoreq.0.09, where R21 is the radius of curvature of the object side of the second lens and R22 is the radius of curvature of the image side of the second lens. The curvature radius of the object side surface of the second lens and the curvature radius of the image side surface of the second lens are controlled to be less than or equal to (R21-R22)/(R21+R22) and less than or equal to-0.09, so that the lens shape of the second lens is controlled, the light ray trend can be effectively controlled, the light ray is lifted, more incident light rays with a field of view enter the rear of the optical system, and the illumination is improved.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: and (CT 3+CT4)/T34 is more than or equal to 0.90 and less than or equal to 0.92, wherein CT3 is the center thickness of the third lens element on the optical axis, CT4 is the center thickness of the fourth lens element on the optical axis, and T34 is the center distance from the object side surface of the third lens element to the image side surface of the fourth lens element on the optical axis. The ratio of the center thickness of the third lens on the optical axis to the center thickness of the fourth lens on the optical axis to the center distance from the object side surface of the third lens to the image side surface of the fourth lens on the optical axis is controlled to be in the range, so that the spherical aberration and the edge aberration can be corrected, and the imaging quality of the optical system can be improved; meanwhile, on the premise of meeting high resolution, the center distance from the object side surface of the third lens to the image side surface of the fourth lens on the optical axis reaches the minimum value through reasonable regulation and control, and the design of miniaturization of the optical system is facilitated.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: F345/F is less than or equal to 1.04 and less than or equal to 1.06, wherein F345 is the combined focal length of the third lens, the fourth lens and the fifth lens, and F is the total effective focal length of the fixed focus lens. By controlling the ratio of the combined focal length of the third lens, the fourth lens and the fifth lens to the total effective focal length of the fixed-focus lens in the range, light rays of each field of view can be smoothly transited to the rear of the optical system, various aberrations generated when the light rays pass through the first lens and the second lens of the optical system can be effectively balanced, and the imaging quality of the optical lens can be improved.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: CTmax/CTmin is equal to or less than 2.69 and equal to or less than 3.33, wherein CTmax is the maximum value of the central thicknesses of the lenses of the first lens to the fifth lens on the optical axis, and CTmin is the minimum value of the central thicknesses of the lenses of the first lens to the fifth lens on the optical axis. The ratio of the maximum value to the minimum value in the central thickness of each lens on the optical axis in the first lens to the fifth lens is controlled in the range, so that the thickness of each lens of the optical lens can be reasonably controlled, the effect of each lens is stable, the change of the light trend at high and low temperatures is small, and the lens is athermalized.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: 13.88mm -1 ≤(Vd2+Vd3)/F≤14.02mm -1 Where Vd2 is the abbe number of the second lens, vd3 is the abbe number of the third lens, and F is the total effective focal length of the fixed focus lens. By controlling the ratio of the Abbe number of the second lens to the Abbe number of the third lens to the total effective focal length of the fixed focus lens within the range, the chromatic aberration of the system can be effectively corrected, which is beneficial to improving the lensSaturation of head color.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: and 3.00-TTL/F-3.08, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the fixed focus lens on the optical axis, and F is the total effective focal length of the fixed focus lens. The ratio of the distance from the center of the object side surface of the first lens to the imaging surface of the fixed focus lens on the optical axis to the total effective focal length of the fixed focus lens is controlled to be in the range, and under the condition of a certain total effective focal length of the optical system, the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens is controlled to be smaller, so that the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis is smaller, the miniaturization of the lens is facilitated, and for example, the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis is less than or equal to 23mm.
In an exemplary embodiment, the fixed focus lens according to the present application may satisfy: BFL is the distance between the center of the image side surface of the fifth lens and the imaging surface of the fixed focus lens on the optical axis, and TTL is the distance between the center of the object side surface of the first lens and the imaging surface on the optical axis. By controlling the ratio of the distance from the center of the image side surface of the fifth lens to the imaging surface of the fixed focus lens on the optical axis to the distance from the center of the object side surface of the first lens to the imaging surface on the optical axis within the range, under the condition that the total length of the optical system is fixed, the assembly yield of the optical lens can be improved by reasonably controlling the back focal length of the optical lens, and the installation of a reserved space for an optical element is facilitated, so that the design elasticity of the optical lens is increased.
In an exemplary embodiment, the fixed focus lens of the present application may further include a filter and/or a cover glass disposed between the fifth lens and the imaging surface, as needed. The optical filter can filter light having a specific wavelength, and the cover glass can prevent an image side element (e.g., a chip) of the fixed focus lens from being damaged.
A fixed focus lens according to embodiments of the present application may employ multiple lenses, such as the five lenses described above. By reasonably setting parameters such as focal power, surface shape, curvature radius, center thickness and Abbe number of each lens, the lens has at least one of the advantages of low distortion, miniaturization, low cost, high resolution and the like.
The fixed focus lens according to the embodiment of the application can realize optical distortion of less than or equal to minus 2.20 percent; the total optical length TTL is less than or equal to 23mm.
However, those skilled in the art will appreciate that the number of lenses making up a lens barrel may be varied to achieve the various results and advantages described in the specification without departing from the technical solutions claimed herein. For example, although the description has been made by taking five lenses as an example in the embodiment, the fixed focus lens is not limited to include five lenses. The fixed focus lens may also include other numbers of lenses, if desired. Specific examples of the fixed focus lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
Fig. 1 is a schematic structural diagram of a fixed focus lens according to embodiment 1 of the present application, and a fixed focus lens according to embodiment 1 of the present application is described below with reference to fig. 1.
As shown in fig. 1, the fixed focus lens sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a filter and/or a cover glass CG, and an imaging plane (IMA).
In this embodiment, the first lens element L1 has a negative refractive power, wherein the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex. The third lens element L3 has positive refractive power, wherein an object-side surface S6 thereof is concave, and an image-side surface S7 thereof is convex. The fourth lens element L4 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface S9 thereof is convex. The fifth lens element L5 has a negative refractive power, wherein an object-side surface S10 thereof is concave, and an image-side surface S11 thereof is concave.
In this embodiment, the filter and/or cover glass CG located between the fifth lens L5 and the imaging plane S14 (IMA) has an object side surface S12 and an image side surface S13. Light from the object passes sequentially through the respective surfaces S1 to S13 and is finally imaged on an imaging surface S14, where an image sensing chip IMA may be provided.
Table 1 shows the radius of curvature R, thickness CT/distance, refractive index N, and abbe number Vd of each lens of the fixed focus lens of example 1. It should be understood that, regarding the "thickness CT/distance", the thickness CT/distance of the row where S1 is located is the center thickness of the first lens L1, the thickness CT/distance of the row where S2 is located is the air gap distance between the first lens L1 and the second lens L2, the thickness CT/distance of the row where S3 is located is the center thickness of the second lens L2, and so on.
TABLE 1
In embodiment 1, the object side surface and the image side surface of the first lens element L1, the second lens element L2, the fourth lens element L4 and the fifth lens element L5 are aspheric, and the surface profile x of each aspheric lens element can be defined by, but not limited to, the following aspheric 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. The cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S1 to S4, S8 to S11 in example 1 are shown in Table 2 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
TABLE 2
In this embodiment, the aperture value fno=2.40 of the fixed focus lens; the optical distortion of the fixed focus lens is +| -1.94% |, and fig. 2 shows the distortion curve of the fixed focus lens of example 1. As can be seen from fig. 2, the fixed focus lens provided in embodiment 1 can achieve the effect of low distortion.
Example 2
Fig. 3 shows a schematic structural diagram of a fixed focus lens according to embodiment 2 of the present application, and a fixed focus lens according to embodiment 2 of the present application is described below with reference to fig. 3. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity.
As shown in fig. 3, the fixed focus lens sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a filter and/or a cover glass CG, and an imaging plane (IMA).
In this embodiment, the first lens element L1 has a negative refractive power, wherein the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex. The third lens element L3 has positive refractive power, wherein an object-side surface S6 thereof is concave, and an image-side surface S7 thereof is convex. The fourth lens element L4 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface S9 thereof is convex. The fifth lens element L5 has a negative refractive power, wherein an object-side surface S10 thereof is concave, and an image-side surface S11 thereof is concave.
In this embodiment, the filter and/or cover glass CG located between the fifth lens L5 and the imaging plane S14 (IMA) has an object side surface S12 and an image side surface S13. Light from the object passes sequentially through the respective surfaces S1 to S13 and is finally imaged on an imaging surface S14, where an image sensing chip IMA may be provided.
Table 3 shows the radius of curvature R, thickness CT/distance, refractive index N, and abbe number Vd of each lens of the fixed focus lens of example 2.
TABLE 3 Table 3
In this embodiment, the object-side surface and the image-side surface of each of the first lens element L1, the second lens element L2, the fourth lens element L4, and the fifth lens element L5 are aspherical, and each aspherical surface type can be defined by the formula (1) given in embodiment 1. Table 4 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S1 to S4, S8 to S11 used in this example 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 2.77 | 3.29E-03 | -1.80E-04 | 2.18E-05 | -3.12E-06 | 2.98E-07 | -1.54E-08 | 3.28E-10 |
| S2 | 3.68 | 6.79E-03 | -4.89E-04 | 2.46E-04 | -8.79E-05 | 1.46E-05 | -8.91E-07 | -3.00E-08 |
| S3 | -7.81 | -6.57E-03 | 9.03E-04 | -5.05E-05 | -4.46E-05 | 1.92E-05 | -3.24E-06 | 2.03E-07 |
| S4 | 0.09 | 2.20E-03 | -7.71E-05 | 9.93E-05 | -4.06E-05 | 1.00E-05 | -1.24E-06 | 6.08E-08 |
| S8 | -16.22 | 3.50E-03 | -5.41E-04 | 7.77E-05 | -8.84E-06 | 7.06E-07 | -3.40E-08 | 8.18E-10 |
| S9 | 1.74 | 1.41E-03 | -4.39E-04 | 6.95E-05 | -4.34E-06 | 6.86E-08 | 2.43E-09 | 1.77E-10 |
| S10 | -30.01 | 5.82E-03 | -1.08E-03 | 2.82E-05 | 1.26E-05 | -1.87E-06 | 9.88E-08 | -1.34E-09 |
| S11 | -28.40 | 1.26E-02 | -1.54E-03 | 1.09E-04 | -1.46E-05 | 3.14E-06 | -3.63E-07 | 1.58E-08 |
TABLE 4 Table 4
In this embodiment, the aperture value fno=2.40 of the fixed focus lens; the optical distortion of the fixed focus lens is +| -2.20% |, and fig. 4 shows the distortion curve of the fixed focus lens of example 2. As can be seen from fig. 4, the fixed focus lens as given in embodiment 2 can achieve the effect of low distortion.
Example 3
Fig. 5 shows a schematic structural diagram of a fixed focus lens according to embodiment 3 of the present application, and a fixed focus lens according to embodiment 3 of the present application is described below with reference to fig. 5.
As shown in fig. 5, the fixed focus lens sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a filter and/or a cover glass CG, and an imaging plane (IMA).
In this embodiment, the first lens element L1 has a negative refractive power, wherein the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex. The third lens element L3 has positive refractive power, wherein an object-side surface S6 thereof is concave, and an image-side surface S7 thereof is convex. The fourth lens element L4 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface S9 thereof is convex. The fifth lens element L5 has a negative refractive power, wherein an object-side surface S10 thereof is concave, and an image-side surface S11 thereof is concave.
In this embodiment, the filter and/or cover glass CG located between the fifth lens L5 and the imaging plane S14 (IMA) has an object side surface S12 and an image side surface S13. Light from the object passes sequentially through the respective surfaces S1 to S13 and is finally imaged on an imaging surface S14, where an image sensing chip IMA may be provided.
Table 5 shows the radius of curvature R, thickness CT/distance, refractive index N, and abbe number Vd of each lens of the fixed focus lens of example 3.
TABLE 5
In this embodiment, the object-side surface and the image-side surface of each of the first lens element L1, the second lens element L2, the fourth lens element L4, and the fifth lens element L5 are aspherical, and each aspherical surface type can be defined by the formula (1) given in embodiment 1. Table 6 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S1 to S4, S8 to S11 used in this example 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 4.15 | 3.29E-03 | -1.80E-04 | 2.18E-05 | -3.12E-06 | 2.98E-07 | -1.54E-08 | 3.28E-10 |
| S2 | 3.08 | 6.79E-03 | -4.89E-04 | 2.46E-04 | -8.79E-05 | 1.46E-05 | -8.91E-07 | -3.00E-08 |
| S3 | -7.99 | -6.57E-03 | 9.03E-04 | -5.05E-05 | -4.46E-05 | 1.92E-05 | -3.24E-06 | 2.03E-07 |
| S4 | 0.01 | 2.20E-03 | -7.71E-05 | 9.93E-05 | -4.06E-05 | 1.00E-05 | -1.24E-06 | 6.08E-08 |
| S8 | -17.04 | 3.50E-03 | -5.41E-04 | 7.77E-05 | -8.84E-06 | 7.06E-07 | -3.40E-08 | 8.18E-10 |
| S9 | 2.01 | 1.41E-03 | -4.39E-04 | 6.95E-05 | -4.34E-06 | 6.86E-08 | 2.43E-09 | 1.77E-10 |
| S10 | -30.01 | 5.82E-03 | -1.08E-03 | 2.82E-05 | 1.26E-05 | -1.87E-06 | 9.88E-08 | -1.34E-09 |
| S11 | -28.40 | 1.26E-02 | -1.54E-03 | 1.09E-04 | -1.46E-05 | 3.14E-06 | -3.63E-07 | 1.58E-08 |
TABLE 6
In this embodiment, the aperture value fno=2.40 of the fixed focus lens; the optical distortion of the fixed focus lens is +| -2.02% |, and fig. 6 shows the distortion curve of the fixed focus lens of example 3. As can be seen from fig. 6, the fixed focus lens provided in embodiment 3 can achieve the effect of low distortion.
Example 4
Fig. 7 shows a schematic structural diagram of a fixed focus lens according to embodiment 4 of the present application, and a fixed focus lens according to embodiment 4 of the present application is described below with reference to fig. 7.
As shown in fig. 7, the fixed focus lens sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a filter and/or a cover glass CG, and an imaging plane (IMA).
In this embodiment, the first lens element L1 has a negative refractive power, wherein the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex. The third lens element L3 has positive refractive power, wherein an object-side surface S6 thereof is concave, and an image-side surface S7 thereof is convex. The fourth lens element L4 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface S9 thereof is convex. The fifth lens element L5 has a negative refractive power, wherein an object-side surface S10 thereof is concave, and an image-side surface S11 thereof is concave.
In this embodiment, the filter and/or cover glass CG located between the fifth lens L5 and the imaging plane S14 (IMA) has an object side surface S12 and an image side surface S13. Light from the object passes sequentially through the respective surfaces S1 to S13 and is finally imaged on an imaging surface S14, where an image sensing chip IMA may be provided.
Table 7 shows the radius of curvature R, thickness CT/distance, refractive index N, and abbe number Vd of each lens of the fixed focus lens of example 4.
TABLE 7
In this embodiment, the object-side surface and the image-side surface of each of the first lens element L1, the second lens element L2, the fourth lens element L4, and the fifth lens element L5 are aspherical, and each aspherical surface type can be defined by the formula (1) given in embodiment 1. Table 8 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S1 to S4, S8 to S11 used in this example 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
TABLE 8
In this embodiment, the aperture value fno=2.40 of the fixed focus lens; the optical distortion of the fixed focus lens is +| -2.19% |, and fig. 8 shows the distortion curve of the fixed focus lens of example 4. As can be seen from fig. 8, the fixed focus lens as given in embodiment 4 can achieve the effect of low distortion.
In summary, examples 1 to 4 each satisfy the relationship shown in table 9 below.
| Conditional\embodiment | Example 1 | Example 2 | Example 3 | Example 4 |
| F1/F | -1.97 | -2.02 | -2.02 | -1.99 |
| R11/F1 | -1.42 | -1.31 | -1.11 | -1.30 |
| (R11+R12)/CT1 | 11.54 | 11.32 | 10.10 | 11.01 |
| F2/F | -54.97 | -50.01 | -58.53 | -58.99 |
| F12/F | -2.23 | -2.27 | -2.28 | -2.26 |
| F3/F | 1.55 | 1.59 | 1.53 | 1.59 |
| (R31+R32)/R22 | 4.45 | 4.04 | 4.95 | 4.02 |
| (R22+R31+R32)/F23 | -3.10 | -2.78 | -3.48 | -2.80 |
| F4/F | 1.03 | 1.01 | 1.04 | 1.02 |
| (R41+R42)/CT4 | 0.13 | 0.07 | 0.02 | 0.10 |
| F5/F | -1.12 | -1.11 | -1.12 | -1.12 |
| F45/F | 4.39 | 4.03 | 4.66 | 4.10 |
| (R21-R22)/(R21+R22) | -0.09 | -0.10 | -0.09 | -0.10 |
| (CT3+CT4)/T34 | 0.91 | 0.91 | 0.92 | 0.90 |
| F345/F | 1.05 | 1.05 | 1.05 | 1.05 |
| CTmax/CTmin | 2.87 | 2.79 | 3.24 | 2.79 |
| (Vd2+Vd3)/F(mm -1 ) | 13.96 | 13.91 | 14.00 | 14.00 |
| TTL/F | 3.05 | 3.02 | 3.06 | 3.03 |
| BFL/TTL | 0.38 | 0.38 | 0.38 | 0.38 |
TABLE 9
The application also provides electronic equipment, which can comprise the fixed focus lens and an imaging element for converting an optical image formed by the fixed focus lens into an electric signal.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the utility model. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (19)
1. The utility model provides a fixed focus camera lens which characterized in that includes in proper order from object side to image side along the optical axis:
the first lens with negative focal power has a convex object side surface and a concave image side surface;
the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;
the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; and
the object side surface of the fifth lens with negative focal power is a concave surface, the image side surface is a concave surface,
the fixed focus lens meets the following conditions:
3.73-5.16 (R31+R32)/R22, wherein R31 is the radius of curvature of the object side of the third lens, R32 is the radius of curvature of the image side of the third lens, and R22 is the radius of curvature of the image side of the second lens.
2. The fixed focus lens of claim 1, wherein an effective focal length F1 of the first lens and a total effective focal length F of the fixed focus lens satisfy: -2.03.ltoreq.F1/F.ltoreq.1.95.
3. The fixed focus lens of claim 1, wherein a radius of curvature R11 of an object side surface of the first lens and an effective focal length F1 of the first lens satisfy: R11/F1 is less than or equal to-1.49 and less than or equal to-1.05.
4. The fixed focus lens of claim 1, wherein a radius of curvature R11 of an object side surface of the first lens, a radius of curvature R12 of an image side surface of the first lens, and a center thickness CT1 of the first lens on the optical axis satisfy: (R11+R12)/CT 1 is more than or equal to 9.79 and less than or equal to 11.91.
5. The fixed focus lens of claim 1, wherein an effective focal length F2 of the second lens and a total effective focal length F of the fixed focus lens satisfy: -61 is less than or equal to F2/F is less than or equal to-48.
6. The fixed focus lens of claim 1, wherein a combined focal length F12 of the first lens and the second lens and a total effective focal length F of the fixed focus lens satisfy: -2.30-2.21 and F12/F-2.
7. The fixed focus lens of claim 1, wherein an effective focal length F3 of the third lens and a total effective focal length F of the fixed focus lens satisfy: F3/F is less than or equal to 1.51 and less than or equal to 1.62.
8. The fixed focus lens of claim 1, wherein a radius of curvature R22 of an image side of the second lens, a radius of curvature R31 of an object side of the third lens, a radius of curvature R32 of an image side of the third lens, and a combined focal length F23 of the second lens and the third lens satisfy: -3.63 < (R22+R31+R32)/F23 < 2.58.
9. The fixed focus lens of claim 1, wherein an effective focal length F4 of the fourth lens and a total effective focal length F of the fixed focus lens satisfy: F4/F is less than or equal to 1.00 and less than or equal to 1.05.
10. The fixed focus lens of claim 1, wherein a radius of curvature R41 of an object side surface of the fourth lens, a radius of curvature R42 of an image side surface of the fourth lens, and a center thickness CT4 of the fourth lens on the optical axis satisfy: (R41+R42)/CT 4 is more than or equal to 0.017 and less than or equal to 0.160.
11. The fixed focus lens of any one of claims 1 to 10, wherein an effective focal length F5 of the fifth lens and a total effective focal length F of the fixed focus lens satisfy: F5/F is less than or equal to-1.13 and less than or equal to-1.11.
12. The fixed focus lens of any one of claims 1 to 10, wherein a combined focal length F45 of the fourth lens and the fifth lens and a total effective focal length F of the fixed focus lens satisfy: F45/F is less than or equal to 3.89 and less than or equal to 4.80.
13. The fixed focus lens of any one of claims 1 to 10, wherein a radius of curvature R21 of an object side surface of the second lens and a radius of curvature R22 of an image side surface of the second lens satisfy: -0.10 < ltoreq.R 21-R22)/(R21+R22) < 0.09.
14. The fixed focus lens as claimed in any one of claims 1 to 10, wherein a center thickness CT3 of the third lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, and a center distance T34 of an object side surface of the third lens to an image side surface of the fourth lens on the optical axis satisfy: (CT3+CT4)/T34 is more than or equal to 0.90 and less than or equal to 0.92.
15. The fixed focus lens of any one of claims 1 to 10, wherein a combined focal length F345 of the third lens, the fourth lens and the fifth lens and a total effective focal length F of the fixed focus lens satisfy: F345/F is less than or equal to 1.04 and less than or equal to 1.06.
16. The fixed focus lens as claimed in any one of claims 1 to 10, wherein a maximum value CTmax in a center thickness of each of the first to fifth lenses on the optical axis and a minimum value CTmin in a center thickness of each of the first to fifth lenses on the optical axis satisfy: CTmax/CTmin is less than or equal to 2.69 and less than or equal to 3.33.
17. The fixed focus lens of any one of claims 1 to 10, wherein an abbe number Vd2 of the second lens, an abbe number Vd3 of the third lens, and a total effective focal length F of the fixed focus lens satisfy: 13.88mm -1 ≤(Vd2+Vd3)/F≤14.02mm -1 。
18. The fixed focus lens of any one of claims 1 to 10, wherein a distance TTL from a center of an object side surface of the first lens to an imaging surface of the fixed focus lens on the optical axis and a total effective focal length F of the fixed focus lens satisfy: TTL/F is less than or equal to 3.00 and less than or equal to 3.08.
19. The fixed focus lens of any one of claims 1 to 10, wherein a distance BFL from a center of an image side surface of the fifth lens to an imaging surface of the fixed focus lens on the optical axis and a distance TTL from a center of an object side surface of the first lens to the imaging surface on the optical axis satisfy: BFL/TTL is more than or equal to 0.37 and less than or equal to 0.39.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321609052.XU CN220271649U (en) | 2023-06-21 | 2023-06-21 | Fixed focus lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321609052.XU CN220271649U (en) | 2023-06-21 | 2023-06-21 | Fixed focus lens |
Publications (1)
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