CN114355577A - Camera lens - Google Patents

Camera lens Download PDF

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Publication number
CN114355577A
CN114355577A CN202210056962.3A CN202210056962A CN114355577A CN 114355577 A CN114355577 A CN 114355577A CN 202210056962 A CN202210056962 A CN 202210056962A CN 114355577 A CN114355577 A CN 114355577A
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lens
imaging
refractive power
lens element
distance
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CN202210056962.3A
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CN114355577B (en
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王彦
肖海东
戴付建
赵烈烽
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Abstract

The invention provides a camera lens. Camera lens includes in proper order along the optical axis by light incident side to light outgoing side: a first lens element with negative refractive power; a second lens element with positive refractive power; a third lens element with negative refractive power; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power; wherein, when the object distance is 25mm, the on-axis distance TTL from the surface of the first lens close to the incident side to the imaging surfaceAWhen the distance from the object to the object is 25mm, the axial distance BFL from the surface of the fifth lens close to the emergent side to the imaging surfaceASatisfies the following conditions: TTL (transistor-transistor logic)A/BFLA<3.5. The invention solves the problem that the wide angle and the microspur of the camera lens in the prior art are difficult to be considered simultaneously.

Description

Camera lens
Technical Field
The invention relates to the technical field of optical imaging equipment, in particular to a camera lens.
Background
With the rapid development of the shooting technology of the smart phone, the public has higher and higher requirements on the shooting capability of the camera lens applied to the smart phone, and the camera lens is required to meet various shooting requirements of the public. Currently, the imaging lens is gradually developed from single shooting to double shooting, three shooting, four shooting, and the like. The multi-camera lens applied to the smart phone in the prior art generally carries a wide-angle camera so as to meet the shooting requirement of a large field of view. However, with the diversification of the application scenes of the camera lens on the mobile phone, some users want to meet the requirement of macro shooting on the basis of wide angle, but the prior art is difficult to meet the requirement.
That is, the imaging lens in the related art has a problem that it is difficult to simultaneously achieve both a wide angle and a macro.
Disclosure of Invention
The invention mainly aims to provide an image pickup lens, which solves the problem that the wide angle and the micro distance of the image pickup lens in the prior art are difficult to be considered simultaneously.
In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens comprising, in order from a light incident side to a light exit side along an optical axis: a first lens element with negative refractive power; a second lens element with positive refractive power; a third lens element with negative refractive power; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power; wherein, when the object distance is 25mm, the on-axis distance TTL from the surface of the first lens close to the incident side to the imaging surfaceAWhen the distance from the object to the object is 25mm, the axial distance BFL from the surface of the fifth lens close to the emergent side to the imaging surfaceASatisfies the following conditions: TTL (transistor-transistor logic)A/BFLA<3.5。
Further, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy: 1.3< (f1+ f5)/f3< 2.3.
Further, the curvature radius R3 of the surface of the second lens close to the incident side, the curvature radius R4 of the surface of the second lens close to the exit side, and the effective focal length f2 of the second lens satisfy: 2.1< (R3-R4)/f2< 3.0.
Further, the curvature radius R6 of the surface of the third lens on the emission side, the curvature radius R8 of the surface of the fourth lens on the emission side, and the effective focal length f of the imaging lens satisfy: 1.6< (R6-R8)/f < 2.2.
Further, a curvature radius R9 of a surface of the fifth lens on the incident side and a curvature radius R10 of a surface of the fifth lens on the exit side satisfy: 1.3< R9/R10< 1.8.
Further, the combined focal length f23 of the second and third lenses and the combined focal length f45 of the fourth and fifth lenses satisfy the following condition: 1.1< f23/f45< 2.0.
Further, an on-axis distance SAG12 between an intersection point of the surface of the first lens close to the exit side and the optical axis to an effective radius vertex of the surface of the first lens close to the exit side, an on-axis distance SAG22 between an intersection point of the surface of the second lens close to the exit side and the optical axis to an effective radius vertex of the surface of the second lens close to the exit side, an air interval T12 of the first lens and the second lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG12-SAG22)/(T12+ CT2) < 0.8.
Further, the central thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 2.8< CT4/ET4< 3.5.
Further, the central thickness CT5 of the fifth lens on the optical axis and the edge thickness ET5 of the fifth lens satisfy: 1.2< ET5/CT5< 2.2.
Further, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens satisfy: 1.0< (ET1+ ET2)/ET3< 1.5.
According to another aspect of the present invention, there is provided an image pickup lens including, in order from a light incident side to a light exit side along an optical axis: a first lens element with negative refractive power; a second lens element with positive refractive power; a third lens element with negative refractive power; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power; the curvature radius R6 of the surface close to the emergent side of the third lens, the curvature radius R8 of the surface close to the emergent side of the fourth lens and the effective focal length f of the imaging lens satisfy the following conditions: 1.6< (R6-R8)/f < 2.2.
Further, when the object distance is 25mm, and the on-axis distance TTLA from the surface of the first lens close to the incident side to the imaging plane and the object distance is 25mm, the on-axis distance BFLA from the surface of the fifth lens close to the exit side to the imaging plane satisfy: TTLA/BFLA < 3.5; the effective focal length f1 of the first lens, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy that: 1.3< (f1+ f5)/f3< 2.3.
Further, the curvature radius R3 of the surface of the second lens close to the incident side, the curvature radius R4 of the surface of the second lens close to the exit side, and the effective focal length f2 of the second lens satisfy: 2.1< (R3-R4)/f2< 3.0.
Further, a curvature radius R9 of a surface of the fifth lens on the incident side and a curvature radius R10 of a surface of the fifth lens on the exit side satisfy: 1.3< R9/R10< 1.8.
Further, the combined focal length f23 of the second and third lenses and the combined focal length f45 of the fourth and fifth lenses satisfy the following condition: 1.1< f23/f45< 2.0.
Further, an on-axis distance SAG12 between an intersection point of the surface of the first lens close to the exit side and the optical axis to an effective radius vertex of the surface of the first lens close to the exit side, an on-axis distance SAG22 between an intersection point of the surface of the second lens close to the exit side and the optical axis to an effective radius vertex of the surface of the second lens close to the exit side, an air interval T12 of the first lens and the second lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG12-SAG22)/(T12+ CT2) < 0.8.
Further, the central thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 2.8< CT4/ET4< 3.5.
Further, the central thickness CT5 of the fifth lens on the optical axis and the edge thickness ET5 of the fifth lens satisfy: 1.2< ET5/CT5< 2.2.
Further, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens satisfy: 1.0< (ET1+ ET2)/ET3< 1.5.
By applying the technical scheme of the invention, the camera lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from a light incidence side to a light emergence side along an optical axis, wherein the first lens has negative refractive power; the second lens element with positive refractive power; the third lens element with negative refractive power; the fourth lens element with positive refractive power; the fifth lens element with negative refractive power; wherein, when the object distance is 25mm, the on-axis distance TTL from the surface of the first lens close to the incident side to the imaging surfaceAWhen the distance from the object to the object is 25mm, the axial distance BFL from the surface of the fifth lens close to the emergent side to the imaging surfaceASatisfies the following conditions: TTL (transistor-transistor logic)A/BFLA<3.5。
The refractive power of each lens in the camera lens is reasonably configured, and when the refractive power of the first lens is negative, the inclination angle of incident light rays is favorably reduced, so that the large field of view of an object space is effectively shared, and a larger field angle range is obtained; when the refractive power of the second lens element is positive, the second lens element is combined with the first lens element, which is beneficial to correcting off-axis aberration and improving imaging quality. When the refractive power of the third lens is negative, the light rays can be diffused, and the image plane of the system is enlarged; on the basis, the refractive power of the fourth lens element is reasonably controlled to be positive, and the refractive power of the fifth lens element is reasonably controlled to be negative, so that the lens elements can be combined with the lens elements, astigmatism in a system is balanced, and tolerance sensitivity is reduced. When the object distance is restricted to be 25mm, the on-axis distance TTL from the surface close to the incident side of the first lens to the imaging surfaceAWhen the distance from the object to the object is 25mm, the axial distance BFL from the surface of the fifth lens close to the emergent side to the imaging surfaceAThe ratio between the two is favorable for reasonably controlling the back focus of the camera lens and leaving a proper space for the automatic focusing of the camera lens, thereby ensuring the shooting effect of the camera lens under the micro-distance of 25mm and ensuring the imaging quality.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view showing a configuration of an imaging lens in a case where an object distance is 25mm according to a first example of the present invention;
fig. 2 and 3 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 1;
fig. 4 is a schematic view showing a configuration of an imaging lens in a case where an object distance is 50mm according to a first example of the present invention;
fig. 5 and 6 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 4;
fig. 7 is a schematic diagram showing a configuration of an imaging lens when an object distance is infinity according to a first example of the present invention;
fig. 8 and 9 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 7;
fig. 10 is a schematic view showing the configuration of an imaging lens in example two of the present invention when the object distance is 25 mm;
fig. 11 and 12 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 10;
fig. 13 is a schematic view showing the configuration of an imaging lens in a case where the object distance is 50mm according to example two of the present invention;
fig. 14 and 15 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 13;
fig. 16 is a schematic diagram showing a configuration of an imaging lens in a case where an object distance is infinity according to a second example of the present invention;
fig. 17 and 18 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 16;
fig. 19 is a schematic view showing a configuration of an imaging lens in a case where an object distance is 25mm according to a third example of the present invention;
fig. 20 and 21 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 19;
fig. 22 is a schematic view showing a configuration of an imaging lens in a case where an object distance is 50mm according to a third example of the present invention;
fig. 23 and 24 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 22;
fig. 25 is a schematic diagram showing a configuration of an imaging lens when an object distance is infinity according to a third example of the present invention;
fig. 26 and 27 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 25;
fig. 28 is a schematic view showing a configuration of an imaging lens when an object distance is 25mm in example four of the present invention;
fig. 29 and 30 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 28;
fig. 31 is a schematic view showing a configuration of an imaging lens when an object distance is 50mm in example four of the present invention;
fig. 32 and 33 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 31;
fig. 34 is a schematic diagram showing a configuration of an imaging lens when an object distance is infinity according to example four of the present invention;
fig. 35 and 36 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 34;
fig. 37 is a schematic view showing a configuration of an imaging lens when an object distance is 25mm in example five of the present invention;
fig. 38 and 39 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 37;
fig. 40 is a schematic view showing a configuration of an imaging lens when an object distance is 50mm in example five of the present invention;
fig. 41 and 42 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 40;
fig. 43 is a schematic diagram showing a configuration of an imaging lens when an object distance is infinity according to example five of the present invention;
fig. 44 and 45 show an astigmatism curve and a distortion curve, respectively, of the imaging lens in fig. 43.
Wherein the figures include the following reference numerals:
e1, first lens; s1, a surface of the first lens near the incident side; s2, the surface of the first lens close to the emergent side; STO, stop; e2, second lens; s3, a surface of the second lens near the incident side; s4, the surface of the second lens close to the emergent side; e3, third lens; s5, a surface of the third lens near the incident side; s6, the surface of the third lens close to the emergent side; e4, fourth lens; s7, a surface of the fourth lens near the incident side; s8, the surface of the fourth lens close to the emergent side; e5, fifth lens; s9, a surface of the fifth lens near the incident side; s10, the surface of the fifth lens close to the emergent side; e6, optical filters; s11, the surface of the filter close to the incident side; s12, the surface of the filter close to the emergent side; and S13, imaging surface.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all 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.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens on the light incident side becomes the surface of the lens on the light incident side, and the surface of each lens on the light outgoing side is referred to as the surface of the lens on the light outgoing side. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. On the surface close to the incident side, when the R value is positive, the surface is judged to be convex, and when the R value is negative, the surface is judged to be concave; the surface closer to the emission side is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.
The invention provides a camera lens, aiming at solving the problem that the wide angle and the microspur of the camera lens in the prior art are difficult to be considered simultaneously.
Example one
As shown in fig. 1 to 45, the image capturing lens sequentially includes a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element along an optical axis from a light incident side to a light emitting side, wherein the first lens element has a negative refractive power; the second lens element with positive refractive power; the third lens element with negative refractive power; the fourth lens element with positive refractive power; the fifth lens element with negative refractive power; wherein, when the object distance is 25mm, the on-axis distance TTL from the surface of the first lens close to the incident side to the imaging surfaceAWhen the distance from the object to the object is 25mm, the axial distance BFL from the surface of the fifth lens close to the emergent side to the imaging surfaceASatisfies the following conditions: TTL (transistor-transistor logic)A/BFLA<3.5。
Preferably, TTLA/BFLA<3.3。
Reasonable configuration cameraWhen the refractive power of the first lens element is negative, the refractive power of each lens element in the image lens is favorable for reducing the inclination angle of incident light, so that the large field of view of the object space is effectively shared, and a larger field of view angle range is obtained; when the refractive power of the second lens element is positive, the second lens element is combined with the first lens element, which is beneficial to correcting off-axis aberration and improving imaging quality. When the refractive power of the third lens is negative, the light rays can be diffused, and the image plane of the system is enlarged; on the basis, the refractive power of the fourth lens element is reasonably controlled to be positive, and the refractive power of the fifth lens element is reasonably controlled to be negative, so that the lens elements can be combined with the lens elements, astigmatism in a system is balanced, and tolerance sensitivity is reduced. When the object distance is restricted to be 25mm, the on-axis distance TTL from the surface close to the incident side of the first lens to the imaging surfaceAWhen the distance from the object to the object is 25mm, the axial distance BFL from the surface of the fifth lens close to the emergent side to the imaging surfaceAThe ratio between the two is favorable for reasonably controlling the back focus of the camera lens and leaving a proper space for the automatic focusing of the camera lens, thereby ensuring the shooting effect of the camera lens under the micro-distance of 25mm and ensuring the imaging quality.
The camera lens is a five-piece wide-angle automatic focusing lens, and can meet the shooting requirement of a micro distance under an object distance of 25mm on the basis of meeting the shooting requirement of a large field angle.
In the present embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the effective focal length f5 of the fifth lens satisfy: 1.3< (f1+ f5)/f3< 2.3. The condition is satisfied, the deflection angle of light can be reduced, and the imaging quality of the camera lens is improved. Preferably, 1.4< (f1+ f5)/f3< 2.2.
In the present embodiment, the curvature radius R3 of the surface of the second lens on the incident side, the curvature radius R4 of the surface of the second lens on the exit side, and the effective focal length f2 of the second lens satisfy: 2.1< (R3-R4)/f2< 3.0. Satisfying the conditional expression, the contribution of the second lens to the astigmatism of the system can be reasonably controlled. Preferably, 2.2< (R3-R4)/f2< 2.9.
In the present embodiment, the curvature radius R6 of the surface on the exit side of the third lens, the curvature radius R8 of the surface on the exit side of the fourth lens, and the effective focal length f of the imaging lens satisfy: 1.6< (R6-R8)/f < 2.2. The system spherical aberration can be effectively eliminated to obtain a high-definition image when the conditional expression is satisfied. Preferably, 1.8< (R6-R8)/f < 2.1.
In the present embodiment, a curvature radius R9 of a surface of the fifth lens on the incident side and a curvature radius R10 of a surface of the fifth lens on the exit side satisfy: 1.3< R9/R10< 1.8. By restricting the ratio of the curvature radius R9 of the surface of the fifth lens close to the incident side to the curvature radius R10 of the surface of the fifth lens close to the emergent side within a reasonable range, the ray angle of the marginal field of view can be within a reasonable range, and the sensitivity of the system can be effectively reduced. Preferably, 1.5< R9/R10< 1.7.
In the present embodiment, a combined focal length f23 of the second and third lenses and a combined focal length f45 of the fourth and fifth lenses satisfy: 1.1< f23/f45< 2.0. By controlling the ratio of the combined focal length f23 of the second lens element and the third lens element to the combined focal length f45 of the fourth lens element and the fifth lens element within a reasonable range, the refractive power of the camera lens can be reasonably distributed, so that the camera lens has good imaging quality and the sensitivity of the camera lens is effectively reduced. Preferably, 1.3< f23/f45< 1.9.
In the present embodiment, an on-axis distance SAG12 between an intersection point of a surface on the exit side of the first lens and the optical axis to an effective radius vertex of the surface on the exit side of the first lens, an on-axis distance SAG22 between an intersection point of a surface on the exit side of the second lens and the optical axis to an effective radius vertex of a surface on the exit side of the second lens, an air interval T12 of the first lens and the second lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG12-SAG22)/(T12+ CT2) < 0.8. The distortion contribution amount of the camera lens can be reasonably controlled by satisfying the conditional expression, so that the camera lens has good distortion performance. Preferably, 0.4< (SAG12-SAG22)/(T12+ CT2) < 0.6.
In the present embodiment, the central thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 2.8< CT4/ET4< 3.5. The ratio of the central thickness CT4 of the fourth lens on the optical axis to the edge thickness ET4 of the fourth lens is controlled within a reasonable range, so that the fourth lens has good machinability, the total length TTL of the system can be guaranteed within a certain range, and miniaturization is effectively guaranteed. Preferably 3.0< CT4/ET4< 3.3.
In the present embodiment, the center thickness CT5 of the fifth lens on the optical axis and the edge thickness ET5 of the fifth lens satisfy: 1.2< ET5/CT5< 2.2. The astigmatism in the system can be balanced, the ghost image in the system can be reduced, and the imaging quality can be guaranteed. Preferably, 1.4< ET5/CT5< 2.0.
In the present embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, and the edge thickness ET3 of the third lens satisfy: 1.0< (ET1+ ET2)/ET3< 1.5. By controlling the conditional expressions among the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens within a reasonable range, the expression of the curvature of field of the system can be reasonably controlled, the aberration of the camera lens in an off-axis field of view is small, ghost images in the system are reduced, and the imaging quality is improved. Preferably, 1.2< (ET1+ ET2)/ET3< 1.4.
Example two
As shown in fig. 1 to 45, the image capturing lens sequentially includes a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element along an optical axis from a light incident side to a light emitting side, wherein the first lens element has a negative refractive power; the second lens element with positive refractive power; the third lens element with negative refractive power; the fourth lens element with positive refractive power; the fifth lens element with negative refractive power; the curvature radius R6 of the surface close to the emergent side of the third lens, the curvature radius R8 of the surface close to the emergent side of the fourth lens and the effective focal length f of the imaging lens satisfy the following conditions: 1.6< (R6-R8)/f < 2.2.
Preferably, 1.8< (R6-R8)/f < 2.1.
The refractive power of each lens in the camera lens is reasonably configured, and when the refractive power of the first lens is negative, the inclination angle of incident light rays is favorably reduced, so that the large field of view of an object space is effectively shared, and a larger field angle range is obtained; when the refractive power of the second lens element is positive, the second lens element is combined with the first lens element, which is beneficial to correcting off-axis aberration and improving imaging quality. When the refractive power of the third lens is negative, the light rays can be diffused, and the image plane of the system is enlarged; on the basis, the refractive power of the fourth lens element is reasonably controlled to be positive, and the refractive power of the fifth lens element is reasonably controlled to be negative, so that the lens elements can be combined with the lens elements, astigmatism in a system is balanced, and tolerance sensitivity is reduced. By controlling the relation between the curvature radius R6 of the surface of the third lens close to the emergent side, the curvature radius R8 of the surface of the fourth lens close to the emergent side and the effective focal length f of the camera lens within a reasonable range, the spherical aberration of the system can be effectively eliminated, so that a high-definition image is obtained, and the imaging quality is ensured.
The camera lens is a five-piece wide-angle automatic focusing lens, and can meet the shooting requirement of a micro distance under an object distance of 25mm on the basis of meeting the shooting requirement of a large field angle.
In this embodiment, when the object distance is 25mm, the on-axis distance TTL from the surface of the first lens close to the incident side to the imaging surfaceAWhen the distance from the object to the object is 25mm, the axial distance BFL from the surface of the fifth lens close to the emergent side to the imaging surfaceASatisfies the following conditions: TTL (transistor-transistor logic)A/BFLA<3.5. When the object distance is restricted to be 25mm, the on-axis distance TTL from the surface close to the incident side of the first lens to the imaging surfaceAWhen the distance from the object to the object is 25mm, the axial distance BFL from the surface of the fifth lens close to the emergent side to the imaging surfaceAThe ratio between the two is favorable for reasonably controlling the back focus of the camera lens and leaving a proper space for the automatic focusing of the camera lens, thereby ensuring the shooting effect of the camera lens under the micro-distance of 25mm and ensuring the imaging quality. Preferably, TTLA/BFLA<3.3。
In the present embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the effective focal length f5 of the fifth lens satisfy: 1.3< (f1+ f5)/f3< 2.3. The condition is satisfied, the deflection angle of light can be reduced, and the imaging quality of the camera lens is improved. Preferably, 1.4< (f1+ f5)/f3< 2.2.
In the present embodiment, the curvature radius R3 of the surface of the second lens on the incident side, the curvature radius R4 of the surface of the second lens on the exit side, and the effective focal length f2 of the second lens satisfy: 2.1< (R3-R4)/f2< 3.0. Satisfying the conditional expression, the contribution of the second lens to the astigmatism of the system can be reasonably controlled. Preferably, 2.2< (R3-R4)/f2< 2.9.
In the present embodiment, a curvature radius R9 of a surface of the fifth lens on the incident side and a curvature radius R10 of a surface of the fifth lens on the exit side satisfy: 1.3< R9/R10< 1.8. By restricting the ratio of the curvature radius R9 of the surface of the fifth lens close to the incident side to the curvature radius R10 of the surface of the fifth lens close to the emergent side within a reasonable range, the ray angle of the marginal field of view can be within a reasonable range, and the sensitivity of the system can be effectively reduced. Preferably, 1.5< R9/R10< 1.7.
In the present embodiment, a combined focal length f23 of the second and third lenses and a combined focal length f45 of the fourth and fifth lenses satisfy: 1.1< f23/f45< 2.0. By controlling the ratio of the combined focal length f23 of the second lens element and the third lens element to the combined focal length f45 of the fourth lens element and the fifth lens element within a reasonable range, the refractive power of the camera lens can be reasonably distributed, so that the camera lens has good imaging quality and the sensitivity of the camera lens is effectively reduced. Preferably, 1.3< f23/f45< 1.9.
In the present embodiment, an on-axis distance SAG12 between an intersection point of a surface on the exit side of the first lens and the optical axis to an effective radius vertex of the surface on the exit side of the first lens, an on-axis distance SAG22 between an intersection point of a surface on the exit side of the second lens and the optical axis to an effective radius vertex of a surface on the exit side of the second lens, an air interval T12 of the first lens and the second lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG12-SAG22)/(T12+ CT2) < 0.8. The distortion contribution amount of the camera lens can be reasonably controlled by satisfying the conditional expression, so that the camera lens has good distortion performance. Preferably, 0.4< (SAG12-SAG22)/(T12+ CT2) < 0.6.
In the present embodiment, the central thickness CT4 of the fourth lens on the optical axis and the edge thickness ET4 of the fourth lens satisfy: 2.8< CT4/ET4< 3.5. The ratio of the central thickness CT4 of the fourth lens on the optical axis to the edge thickness ET4 of the fourth lens is controlled within a reasonable range, so that the fourth lens has good machinability, the total length TTL of the system can be guaranteed within a certain range, and miniaturization is effectively guaranteed. Preferably 3.0< CT4/ET4< 3.3.
In the present embodiment, the center thickness CT5 of the fifth lens on the optical axis and the edge thickness ET5 of the fifth lens satisfy: 1.2< ET5/CT5< 2.2. The astigmatism in the system can be balanced, the ghost image in the system can be reduced, and the imaging quality can be guaranteed. Preferably, 1.4< ET5/CT5< 2.0.
In the present embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, and the edge thickness ET3 of the third lens satisfy: 1.0< (ET1+ ET2)/ET3< 1.5. By controlling the conditional expressions among the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens and the edge thickness ET3 of the third lens within a reasonable range, the expression of the curvature of field of the system can be reasonably controlled, the aberration of the camera lens in an off-axis field of view is small, ghost images in the system are reduced, and the imaging quality is improved. Preferably, 1.2< (ET1+ ET2)/ET3< 1.4.
The above-described image pickup lens may further optionally include a filter for correcting color deviation or a protective glass for protecting a photosensitive element located on the image forming surface.
The imaging lens in the present application may employ a plurality of lenses, for example, the five lenses described above. By reasonably distributing the refractive power, the surface shape, the center thickness of each lens, the on-axis distance between each lens and the like, the sensitivity of the lens can be effectively reduced, the machinability of the lens can be improved, and the camera lens is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The left side is the light incident side and the right side is the light emergent side.
In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.
However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the imaging lens is not limited to including five lenses. The camera lens may also include other numbers of lenses, as desired.
Examples of specific surface types and parameters of the imaging lens applicable to the above embodiments are further described below with reference to the drawings.
It should be noted that any one of the following examples one to five is applicable to all embodiments of the present application.
Example one
As shown in fig. 1 to 9, an imaging lens of the first example of the present application is described. Fig. 1 is a schematic diagram showing a configuration of an imaging lens in a case where an object distance is 25mm in example one. Fig. 4 is a schematic diagram showing the configuration of an imaging lens in the case where the object distance is 50mm in example one. Fig. 7 is a schematic diagram showing a configuration of an imaging lens in a case where the object distance is infinity according to example one.
As shown in fig. 1, 4 and 7, the camera lens sequentially includes, from the light incident side to the light exiting side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.
The first lens element E1 has negative refractive power, and the surface S1 of the first lens element near the incident side is concave, and the surface S2 of the first lens element near the exit side is concave. The second lens element E2 has positive refractive power, and its surface S3 on the incident side is convex and its surface S4 on the exit side is convex. The third lens element E3 has negative refractive power, and its surface S5 on the incident side is convex and its surface S6 on the exit side is concave. The fourth lens element E4 has positive refractive power, and a surface S7 of the fourth lens element near the incident side is concave, and a surface S8 of the fourth lens element near the exit side is convex. The fifth lens element E5 has negative refractive power, and its surface S9 on the incident side is convex and its surface S10 on the exit side is concave. The filter E6 has a face S11 on the incident side of the filter and a face S12 on the emission side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this example, the total effective focal length f of the imaging lens is 1.68mm, and the image height ImgH of the imaging lens is 2.42 mm.
Table 1 shows a basic structural parameter table of the imaging lens of example one, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).
Figure BDA0003476716040000101
TABLE 1
In the first example, a surface near the incident side and a surface near the exit side of any one of the first lens E1 to the fifth lens E5 are both aspheric surfaces, and the surface type of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:
Figure BDA0003476716040000102
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30, which can be used for each of the aspherical mirrors S1-S10 in example one.
Figure BDA0003476716040000103
Figure BDA0003476716040000111
TABLE 2
Table 3 shows a parameter table of the imaging lens of example one at object distances of 25mm, 50mm, and infinity. Wherein D1 and D14 are the data shown in Table 1; TTL is the total system length of the camera lens.
Object distance/parameter D1(mm) D14(mm) TTL(mm)
25mm 25.0000 0.5615 4.27
50mm 50.0000 0.5033 4.21
All-round All-round 0.4459 4.15
TABLE 3
Fig. 2 shows an astigmatism curve of the imaging lens at an object distance of 25 mm. Fig. 3 shows a distortion curve of the imaging lens at an object distance of 25 mm. Fig. 5 shows an astigmatism curve of the imaging lens at an object distance of 50 mm. Fig. 6 shows a distortion curve of the imaging lens at an object distance of 50 mm. Fig. 8 shows an astigmatism curve of the imaging lens when the object distance is infinity. Fig. 9 shows a distortion curve of the imaging lens when the object distance is infinity. The astigmatism curve represents meridional image plane curvature and sagittal image plane curvature, and the distortion curve represents distortion magnitude values corresponding to different angles of view.
As can be seen from fig. 1 to 9, the imaging lens according to the first example can achieve good imaging quality.
Example two
As shown in fig. 10 to 18, an imaging lens of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 10 is a schematic diagram showing the configuration of the imaging lens in example two when the object distance is 25 mm. Fig. 13 is a schematic diagram showing the configuration of the imaging lens in example two when the object distance is 50 mm. Fig. 16 is a schematic diagram showing a configuration of an imaging lens in example two when the object distance is infinity.
As shown in fig. 10, 13 and 16, the camera lens includes, in order from the light incident side to the light exit side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.
The first lens element E1 has negative refractive power, and the surface S1 of the first lens element near the incident side is convex, and the surface S2 of the first lens element near the exit side is concave. The second lens element E2 has positive refractive power, and its surface S3 on the incident side is convex and its surface S4 on the exit side is convex. The third lens element E3 has negative refractive power, and its surface S5 on the incident side is convex and its surface S6 on the exit side is concave. The fourth lens element E4 has positive refractive power, and a surface S7 of the fourth lens element near the incident side is concave, and a surface S8 of the fourth lens element near the exit side is convex. The fifth lens element E5 has negative refractive power, and its surface S9 on the incident side is convex and its surface S10 on the exit side is concave. The filter E6 has a face S11 on the incident side of the filter and a face S12 on the emission side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this example, the total effective focal length f of the imaging lens is 1.69mm, and the image height ImgH of the imaging lens is 2.42 mm.
Table 4 shows a basic structural parameter table of the imaging lens of example two, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).
Figure BDA0003476716040000121
TABLE 4
Table 5 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.
Figure BDA0003476716040000122
Figure BDA0003476716040000131
TABLE 5
Table 6 shows a parameter table of the imaging lens of example two when the object distance is 25mm, 50mm, and infinity. Wherein D1 and D14 are the data shown in Table 4; TTL is the total system length of the camera lens.
Object distance/parameter D1(mm) D14(mm) TTL(mm)
25mm 25.0000 0.5507 4.27
50mm 50.0000 0.4933 4.21
All-round All-round 0.4375 4.15
TABLE 6
Fig. 11 shows an astigmatism curve of the imaging lens when the object distance is 25 mm. Fig. 12 shows a distortion curve of the imaging lens at an object distance of 25 mm. Fig. 14 shows an astigmatism curve of the imaging lens at an object distance of 50 mm. Fig. 15 shows a distortion curve of the imaging lens at an object distance of 50 mm. Fig. 17 shows an astigmatism curve of the imaging lens when the object distance is infinity. Fig. 18 shows a distortion curve of the imaging lens when the object distance is infinity. The astigmatism curve represents meridional image plane curvature and sagittal image plane curvature, and the distortion curve represents distortion magnitude values corresponding to different angles of view.
As can be seen from fig. 10 to 18, the imaging lens according to example two can achieve good imaging quality.
Example III
As shown in fig. 19 to 27, an imaging lens of example three of the present application is described. Fig. 19 is a schematic diagram showing the configuration of an imaging lens in example three when the object distance is 25 mm. Fig. 22 is a schematic diagram showing the configuration of an imaging lens in example three when the object distance is 50 mm. Fig. 25 is a schematic diagram showing a configuration of an imaging lens in a case where the object distance is infinity in example three.
As shown in fig. 19, 22 and 25, the camera lens includes, in order from the light incident side to the light exit side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.
The first lens element E1 has negative refractive power, and the surface S1 of the first lens element near the incident side is concave, and the surface S2 of the first lens element near the exit side is convex. The second lens element E2 has positive refractive power, and its surface S3 on the incident side is convex and its surface S4 on the exit side is convex. The third lens element E3 has negative refractive power, and its surface S5 on the incident side is convex and its surface S6 on the exit side is concave. The fourth lens element E4 has positive refractive power, and a surface S7 of the fourth lens element near the incident side is concave, and a surface S8 of the fourth lens element near the exit side is convex. The fifth lens element E5 has negative refractive power, and its surface S9 on the incident side is convex and its surface S10 on the exit side is concave. The filter E6 has a face S11 on the incident side of the filter and a face S12 on the emission side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this example, the total effective focal length f of the imaging lens is 1.69mm, and the image height ImgH of the imaging lens is 2.42 mm.
Table 7 shows a basic structural parameter table of the imaging lens of example three, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).
Figure BDA0003476716040000141
TABLE 7
Table 8 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 1.0158E+00 -3.1984E+00 2.1709E+01 -1.5070E+02 8.1001E+02 -3.1881E+03 9.1866E+03
S2 1.3722E+00 -6.5958E+00 8.7592E+01 -5.8053E+02 -2.7431E+03 9.4824E+04 -9.6109E+05
S3 1.8654E-01 -2.0658E+01 1.0723E+03 -4.0732E+04 1.1827E+06 -2.6258E+07 4.3460E+08
S4 -1.5275E+00 1.4277E+01 -2.3468E+02 3.5446E+03 -4.2640E+04 4.1957E+05 -3.5139E+06
S5 -1.7407E+00 8.5138E+00 -7.5125E+01 8.8943E+02 -9.7219E+03 8.3089E+04 -5.5051E+05
S6 -5.1793E-01 -1.8003E+00 3.9314E+01 -3.6959E+02 2.5141E+03 -1.3220E+04 5.3146E+04
S7 4.0982E-01 -3.7309E+00 2.0223E+01 -6.4759E+01 1.4584E+02 -3.6317E+02 1.2679E+03
S8 -4.4564E-01 4.2631E+00 -2.7043E+01 1.3383E+02 -5.2426E+02 1.6090E+03 -3.7569E+03
S9 -1.4725E+00 3.8090E+00 -1.8043E+01 7.7556E+01 -2.3617E+02 5.1083E+02 -8.0250E+02
S10 -2.1745E+00 4.1908E+00 -6.9726E+00 9.6856E+00 -1.0907E+01 9.6342E+00 -6.5195E+00
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 -1.9461E+04 3.0239E+04 -3.4026E+04 2.6951E+04 -1.4231E+04 4.4903E+03 -6.3933E+02
S2 5.7884E+06 -2.3245E+07 6.4135E+07 -1.2065E+08 1.4827E+08 -1.0748E+08 3.4870E+07
S3 -5.2498E+09 4.5575E+10 -2.7954E+11 1.1782E+12 -3.2401E+12 5.2296E+12 -3.7546E+12
S4 2.4212E+07 -1.2786E+08 4.8749E+08 -1.2786E+09 2.1749E+09 -2.1540E+09 9.4180E+08
S5 2.8315E+06 -1.1078E+07 3.1873E+07 -6.4573E+07 8.6576E+07 -6.8688E+07 2.4366E+07
S6 -1.5989E+05 3.5347E+05 -5.6290E+05 6.2656E+05 -4.6197E+05 2.0254E+05 -3.9946E+04
S7 -3.9022E+03 8.3073E+03 -1.1804E+04 1.1063E+04 -6.5888E+03 2.2644E+03 -3.4243E+02
S8 6.5099E+03 -8.2117E+03 7.3880E+03 -4.5980E+03 1.8754E+03 -4.5005E+02 4.8087E+01
S9 9.2442E+02 -7.7873E+02 4.7292E+02 -2.0108E+02 5.6694E+01 -9.5071E+00 7.1693E-01
S10 3.3263E+00 -1.2592E+00 3.4547E-01 -6.6075E-02 8.2290E-03 -5.8467E-04 1.7080E-05
TABLE 8
Table 9 shows a parameter table of the imaging lens of example three when the object distance is 25mm, 50mm, and infinity. Wherein D1 and D14 are the data shown in Table 7; TTL is the total system length of the camera lens.
Object distance/parameter D1(mm) D14(mm) TTL(mm)
25mm 25.0000 0.5417 4.22
50mm 50.0000 0.4832 4.17
All-round All-round 0.4284 4.11
TABLE 9
Fig. 20 shows an astigmatism curve of the imaging lens when the object distance is 25 mm. Fig. 21 shows a distortion curve of the imaging lens when the object distance is 25 mm. Fig. 23 shows an astigmatism curve of the imaging lens when the object distance is 50 mm. Fig. 24 shows a distortion curve of the imaging lens at an object distance of 50 mm. Fig. 26 shows an astigmatism curve of the imaging lens when the object distance is infinity. Fig. 27 shows a distortion curve of the imaging lens when the object distance is infinity. The astigmatism curve represents meridional image plane curvature and sagittal image plane curvature, and the distortion curve represents distortion magnitude values corresponding to different angles of view.
As can be seen from fig. 19 to 27, the imaging lens according to the third example can achieve good image quality.
Example four
As shown in fig. 28 to 36, an imaging lens of the present example four is described. Fig. 28 is a schematic diagram showing the configuration of an imaging lens in example four when the object distance is 25 mm. Fig. 31 is a schematic diagram showing the configuration of an imaging lens in example four when the object distance is 50 mm. Fig. 34 shows a schematic configuration diagram of an imaging lens in example four when the object distance is infinity.
As shown in fig. 28, 31, and 34, the camera lens includes, in order from the light incident side to the light exit side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.
The first lens element E1 has negative refractive power, and the surface S1 of the first lens element near the incident side is concave, and the surface S2 of the first lens element near the exit side is concave. The second lens element E2 has positive refractive power, and its surface S3 on the incident side is convex and its surface S4 on the exit side is convex. The third lens element E3 has negative refractive power, and its surface S5 on the incident side is concave, and its surface S6 on the exit side is concave. The fourth lens element E4 has positive refractive power, and a surface S7 of the fourth lens element near the incident side is concave, and a surface S8 of the fourth lens element near the exit side is convex. The fifth lens element E5 has negative refractive power, and its surface S9 on the incident side is convex and its surface S10 on the exit side is concave. The filter E6 has a face S11 on the incident side of the filter and a face S12 on the emission side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this example, the total effective focal length f of the imaging lens is 1.69mm, and the image height ImgH of the imaging lens is 2.42 mm.
Table 10 shows a basic structural parameter table of the imaging lens of example four, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).
Figure BDA0003476716040000151
Figure BDA0003476716040000161
Watch 10
Table 11 shows the high-order term coefficients that can be used for each aspherical mirror surface in example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 9.1716E-01 -1.5509E+00 -1.4119E+00 5.3417E+01 -3.8346E+02 1.6935E+03 -5.1905E+03
S2 1.4526E+00 -6.8425E+00 8.3309E+01 3.5259E+01 -2.1133E+04 3.8256E+05 -3.7448E+06
S3 -1.9210E-03 4.5458E+00 -6.6593E+02 3.0373E+04 -7.3789E+05 1.0361E+07 -7.7239E+07
S4 -1.6854E+00 2.8383E+01 -7.6232E+02 1.4694E+04 -1.9101E+05 1.7138E+06 -1.0883E+07
S5 -1.6623E+00 2.3952E+00 8.3143E+01 -1.7739E+03 2.2489E+04 -1.9985E+05 1.2738E+06
S6 -4.7897E-01 -5.4826E+00 1.1100E+02 -1.1958E+03 8.9635E+03 -4.8584E+04 1.9211E+05
S7 3.8764E-01 -2.6840E+00 1.0690E+01 -1.4500E+01 -6.8145E+01 4.6125E+02 -1.4066E+03
S8 -5.3426E-01 4.2730E+00 -1.8125E+01 4.2895E+01 -3.3896E+01 -1.0681E+02 4.0983E+02
S9 -1.3369E+00 3.7587E+00 -1.4808E+01 4.5154E+01 -9.5197E+01 1.4090E+02 -1.4971E+02
S10 -1.7424E+00 3.0664E+00 -5.0843E+00 7.2635E+00 -8.1653E+00 6.7022E+00 -3.7629E+00
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 1.1392E+04 -1.7935E+04 1.9926E+04 -1.5093E+04 7.3245E+03 -2.0204E+03 2.3556E+02
S2 2.3674E+07 -1.0210E+08 3.0467E+08 -6.2100E+08 8.2730E+08 -6.5040E+08 2.2911E+08
S3 7.6485E+07 4.4171E+09 -4.7490E+10 2.5511E+11 -7.9608E+11 1.3770E+12 -1.0259E+12
S4 4.9629E+07 -1.6314E+08 3.8331E+08 -6.2806E+08 6.8207E+08 -4.4163E+08 1.2923E+08
S5 -5.8562E+06 1.9388E+07 -4.5708E+07 7.4779E+07 -8.0628E+07 5.1504E+07 -1.4760E+07
S6 -5.5480E+05 1.1639E+06 -1.7478E+06 1.8251E+06 -1.2549E+06 5.0929E+05 -9.2113E+04
S7 2.7402E+03 -3.6837E+03 3.4813E+03 -2.2839E+03 9.9409E+02 -2.5874E+02 3.0522E+01
S8 -7.0521E+02 7.5877E+02 -5.5051E+02 2.7333E+02 -9.0366E+01 1.8135E+01 -1.6813E+00
S9 1.1500E+02 -6.2906E+01 2.3359E+01 -5.2392E+00 4.6309E-01 5.5373E-02 -1.2092E-02
S10 1.2801E+00 -1.3697E-01 -9.2790E-02 5.1696E-02 -1.2409E-02 1.5347E-03 -7.9544E-05
TABLE 11
Table 12 shows a parameter table of the imaging lens of example four at object distances of 25mm, 50mm, and infinity. Wherein D1 and D14 are the data shown in Table 10; TTL is the total system length of the camera lens.
Object distance/parameter D1(mm) D14(mm) TTL(mm)
25mm 25.0000 0.5571 4.30
50mm 50.0000 0.4988 4.24
All-round All-round 0.4427 4.19
TABLE 12
Fig. 29 shows an astigmatism curve of the imaging lens when the object distance is 25 mm. Fig. 30 shows a distortion curve of the imaging lens at an object distance of 25 mm. Fig. 32 shows an astigmatism curve of the imaging lens when the object distance is 50 mm. Fig. 33 shows a distortion curve of the imaging lens at an object distance of 50 mm. Fig. 35 shows an astigmatism curve of the imaging lens when the object distance is infinity. Fig. 36 shows a distortion curve of the imaging lens when the object distance is infinity. The astigmatism curve represents meridional image plane curvature and sagittal image plane curvature, and the distortion curve represents distortion magnitude values corresponding to different angles of view.
As can be seen from fig. 28 to 36, the imaging lens according to example four can achieve good imaging quality.
Example five
As shown in fig. 37 to 45, an imaging lens of example five of the present application is described. Fig. 37 is a schematic diagram showing the configuration of an imaging lens in example five when the object distance is 25 mm. Fig. 40 is a schematic diagram showing the configuration of an imaging lens in example five when the object distance is 50 mm. Fig. 43 is a schematic diagram showing a configuration of an imaging lens when the object distance is infinity in example five.
As shown in fig. 37, 40, and 43, the camera lens includes, in order from the light incident side to the light exit side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.
The first lens element E1 has negative refractive power, and the surface S1 of the first lens element near the incident side is concave, and the surface S2 of the first lens element near the exit side is concave. The second lens element E2 has positive refractive power, and its surface S3 on the incident side is convex and its surface S4 on the exit side is convex. The third lens element E3 has negative refractive power, and its surface S5 on the incident side is convex and its surface S6 on the exit side is concave. The fourth lens element E4 has positive refractive power, and a surface S7 of the fourth lens element near the incident side is convex, and a surface S8 of the fourth lens element near the exit side is convex. The fifth lens element E5 has negative refractive power, and its surface S9 on the incident side is convex and its surface S10 on the exit side is concave. The filter E6 has a face S11 on the incident side of the filter and a face S12 on the emission side of the filter. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this example, the total effective focal length f of the imaging lens is 1.69mm, and the image height ImgH of the imaging lens is 2.42 mm.
Table 13 shows a basic structural parameter table of the imaging lens of example five, in which the units of the radius of curvature and the thickness/distance are millimeters (mm).
Figure BDA0003476716040000171
Figure BDA0003476716040000181
Watch 13
Table 14 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 9.2390E-01 -2.0652E+00 6.6736E+00 -1.3820E+01 -3.3895E+01 4.8667E+02 -2.3968E+03
S2 1.3619E+00 -1.3601E+00 -1.3027E+02 5.0581E+03 -9.7009E+04 1.1623E+06 -9.3941E+06
S3 -1.1933E-02 4.4753E+00 -6.2553E+02 2.7998E+04 -6.6508E+05 8.9506E+06 -5.8605E+07
S4 -1.4702E+00 1.1277E+01 -1.4274E+02 7.9805E+02 1.6970E+04 -4.5345E+05 5.2332E+06
S5 -1.6226E+00 2.3226E+00 7.5935E+01 -1.5137E+03 1.7245E+04 -1.3215E+05 6.8572E+05
S6 -4.5940E-01 -6.6896E+00 1.4219E+02 -1.6935E+03 1.4022E+04 -8.3123E+04 3.5667E+05
S7 4.1331E-01 -3.4353E+00 1.8565E+01 -6.3180E+01 1.2918E+02 -8.9622E+01 -3.2142E+02
S8 -5.5031E-01 5.0404E+00 -2.9317E+01 1.2703E+02 -4.2535E+02 1.1194E+03 -2.2846E+03
S9 -1.3584E+00 4.1119E+00 -1.9946E+01 7.6692E+01 -2.0736E+02 4.0191E+02 -5.6988E+02
S10 -1.7168E+00 2.7541E+00 -3.8230E+00 4.4247E+00 -4.0854E+00 2.7877E+00 -1.2481E+00
Flour mark A18 A20 A22 A24 A26 A28 A30
S1 7.2418E+03 -1.4698E+04 2.0432E+04 -1.9225E+04 1.1724E+04 -4.1894E+03 6.6750E+02
S2 5.3081E+07 -2.1262E+08 6.0195E+08 -1.1790E+09 1.5211E+09 -1.1635E+09 3.9988E+08
S3 -9.7988E+07 5.5936E+09 -5.3205E+10 2.7475E+11 -8.4166E+11 1.4415E+12 -1.0681E+12
S4 -3.6913E+07 1.7282E+08 -5.4952E+08 1.1760E+09 -1.6237E+09 1.3071E+09 -4.6622E+08
S5 -2.3168E+06 4.4425E+06 -1.5544E+06 -1.4604E+07 3.7488E+07 -4.0271E+07 1.7034E+07
S6 -1.1134E+06 2.5241E+06 -4.1058E+06 4.6657E+06 -3.5142E+06 1.5756E+06 -3.1820E+05
S7 1.2197E+03 -2.1795E+03 2.4577E+03 -1.8311E+03 8.7889E+02 -2.4706E+02 3.0958E+01
S8 3.5279E+03 -4.0165E+03 3.2829E+03 -1.8617E+03 6.9305E+02 -1.5204E+02 1.4886E+01
S9 5.9508E+02 -4.5520E+02 2.5096E+02 -9.6732E+01 2.4673E+01 -3.7354E+00 2.5385E-01
S10 2.4582E-01 8.7946E-02 -8.6189E-02 3.1898E-02 -6.6305E-03 7.6122E-04 -3.7759E-05
TABLE 14
Table 15 shows a parameter table of the imaging lens of example five when the object distance is 25mm, 50mm, and infinity. Wherein D1 and D14 are the data shown in Table 13; TTL is the total system length of the camera lens.
Object distance/parameter D1(mm) D14(mm) TTL(mm)
25mm 25.0000 0.5422 4.26
50mm 50.0000 0.4838 4.20
All-round All-round 0.4279 4.15
Watch 15
Fig. 38 shows an astigmatism curve of the imaging lens when the object distance is 25 mm. Fig. 39 shows a distortion curve of the imaging lens at an object distance of 25 mm. Fig. 41 shows an astigmatism curve of the imaging lens when the object distance is 50 mm. Fig. 42 shows a distortion curve of the imaging lens at an object distance of 50 mm. Fig. 44 shows an astigmatism curve of the imaging lens when the object distance is infinity. Fig. 45 shows a distortion curve of the imaging lens when the object distance is infinity. The astigmatism curve represents meridional image plane curvature and sagittal image plane curvature, and the distortion curve represents distortion magnitude values corresponding to different angles of view.
As can be seen from fig. 37 to 45, the imaging lens according to example four can achieve good imaging quality.
To sum up, examples one to five respectively satisfy the relationships shown in table 16.
Conditional formula/example 1 2 3 4 5
TTLA/BFLA 3.16 3.20 3.22 3.20 3.24
(f1+f5)/f3 1.51 1.46 1.51 2.16 1.55
(R3-R4)/f2 2.33 2.29 2.81 2.47 2.30
(R6-R8)/f 1.81 1.81 2.05 2.07 1.81
R9/R10 1.59 1.59 1.68 1.60 1.60
f23/f45 1.70 1.67 1.39 1.80 1.80
(SAG12-SAG22)/(T12+CT2) 0.49 0.50 0.46 0.51 0.50
CT4/ET4 3.17 3.23 3.13 3.12 3.05
ET5/CT5 1.41 1.58 1.99 1.56 1.72
(ET1+ET2)/ET3 1.34 1.29 1.28 1.22 1.27
Table 16 table 17 gives effective focal lengths f of the imaging lenses of example one to example five, effective focal lengths f1 to f5 of the respective lenses, and the like.
Parameter/example 1 2 3 4 5
f1(mm) -4.42 -4.37 -5.36 -4.49 -4.33
f2(mm) 2.30 2.30 2.19 2.04 2.33
f3(mm) -5.50 -5.65 -5.55 -3.90 -5.27
f4(mm) 1.69 1.69 1.66 1.69 1.69
f5(mm) -3.92 -3.87 -3.03 -3.93 -3.85
f(mm) 1.68 1.69 1.69 1.69 1.69
ImgH(mm) 2.42 2.42 2.42 2.42 2.42
TABLE 17
The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the above-described image pickup lens.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A camera lens, characterized by comprising in order from a light incident side to a light exit side along an optical axis:
a first lens element with negative refractive power;
a second lens element with positive refractive power;
a third lens element with negative refractive power;
a fourth lens element with positive refractive power;
a fifth lens element with negative refractive power;
wherein, when the object distance is 25mm, the on-axis distance TTL from the surface of the first lens close to the incident side to the imaging surfaceAAnd when the distance between the fifth lens and the object is 25mm, the axial distance BFL from the surface of the fifth lens close to the emergent side to the imaging surfaceASatisfies the following conditions: TTL (transistor-transistor logic)A/BFLA<3.5。
2. The imaging lens according to claim 1, wherein an effective focal length f1 of the first lens, an effective focal length f3 of the third lens, and an effective focal length f5 of the fifth lens satisfy: 1.3< (f1+ f5)/f3< 2.3.
3. The imaging lens according to claim 1, wherein a curvature radius R3 of a surface of the second lens on an incident side, a curvature radius R4 of a surface of the second lens on an exit side, and an effective focal length f2 of the second lens satisfy: 2.1< (R3-R4)/f2< 3.0.
4. The imaging lens according to claim 1, wherein a curvature radius R6 of a surface on the exit side of the third lens, a curvature radius R8 of a surface on the exit side of the fourth lens, and an effective focal length f of the imaging lens satisfy: 1.6< (R6-R8)/f < 2.2.
5. The imaging lens according to claim 1, wherein a radius of curvature R9 of a surface of the fifth lens on an incident side and a radius of curvature R10 of a surface of the fifth lens on an exit side satisfy: 1.3< R9/R10< 1.8.
6. The imaging lens according to claim 1, wherein a combined focal length f23 of the second and third lenses and a combined focal length f45 of the fourth and fifth lenses satisfy: 1.1< f23/f45< 2.0.
7. The imaging lens according to claim 1, wherein an on-axis distance SAG12 between an intersection point of the optical axis and a surface close to an emission side of the first lens to an effective radius apex of the surface close to the emission side of the first lens, an on-axis distance SAG22 between an intersection point of the optical axis and a surface close to an emission side of the second lens to an effective radius apex of a surface close to an emission side of the second lens, an air interval T12 of the first lens and the second lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG12-SAG22)/(T12+ CT2) < 0.8.
8. The imaging lens according to claim 1, wherein a center thickness CT4 of the fourth lens on the optical axis and an edge thickness ET4 of the fourth lens satisfy: 2.8< CT4/ET4< 3.5.
9. The imaging lens according to claim 1, wherein a center thickness CT5 of the fifth lens on the optical axis and an edge thickness ET5 of the fifth lens satisfy: 1.2< ET5/CT5< 2.2.
10. A camera lens, characterized by comprising in order from a light incident side to a light exit side along an optical axis:
a first lens element with negative refractive power;
a second lens element with positive refractive power;
a third lens element with negative refractive power;
a fourth lens element with positive refractive power;
a fifth lens element with negative refractive power;
wherein a curvature radius R6 of a surface of the third lens close to the exit side, a curvature radius R8 of a surface of the fourth lens close to the exit side, and an effective focal length f of the imaging lens satisfy: 1.6< (R6-R8)/f < 2.2.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108303781A (en) * 2017-10-19 2018-07-20 瑞声声学科技(深圳)有限公司 Pick-up lens
CN110187473A (en) * 2019-06-21 2019-08-30 广东旭业光电科技股份有限公司 Five chip wide-angle lens of one kind and electronic equipment
CN112083548A (en) * 2019-06-13 2020-12-15 南昌欧菲精密光学制品有限公司 Optical assembly, imaging module and electronic equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108303781A (en) * 2017-10-19 2018-07-20 瑞声声学科技(深圳)有限公司 Pick-up lens
CN112083548A (en) * 2019-06-13 2020-12-15 南昌欧菲精密光学制品有限公司 Optical assembly, imaging module and electronic equipment
CN110187473A (en) * 2019-06-21 2019-08-30 广东旭业光电科技股份有限公司 Five chip wide-angle lens of one kind and electronic equipment

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