CN210639336U - Imaging lens group and imaging device - Google Patents
Imaging lens group and imaging device Download PDFInfo
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- CN210639336U CN210639336U CN201921481910.0U CN201921481910U CN210639336U CN 210639336 U CN210639336 U CN 210639336U CN 201921481910 U CN201921481910 U CN 201921481910U CN 210639336 U CN210639336 U CN 210639336U
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Abstract
The utility model provides an imaging lens group and image device. The imaging lens group comprises a first imaging lens, a second imaging lens and a third imaging lens which are arranged at intervals in sequence, and the first imaging lens, the second imaging lens and the third imaging lens meet the requirements: fno of 1.0 <1＜Fno2＜Fno3＜3.0；5.0mm＞F1＞F2＞F3＞1.0mm；P1＜P2＜P3(ii) a Wherein, Fno1Is the f-number of the first imaging lens，Fno2F, the f number of the second imaging lens3F is the F-number of the third imaging lens1Is the effective focal length of the first imaging lens, F2Is the effective focal length of the second imaging lens, F3Is the effective focal length, P, of the third imaging lens1Is the object distance, P, of the first imaging lens2Is the object distance, P, of the second imaging lens3Is the object distance of the third imaging lens. The utility model provides an among the prior art imaging device have the problem that the resolution ratio of 3D structured light is low in the scene far away.
Description
Technical Field
The utility model relates to an optical lens imaging technology field particularly, relates to an imaging lens group and image device.
Background
In recent years, with the gradual rise of three-dimensional depth application, chip technology and intelligent algorithms are rapidly developed, a structured light lens is used for projecting light emitted by an infrared LD (laser diode) or a VCSEL (vertical cavity surface emitting laser) to an interactive target, a projection beam is subjected to optical diffraction element (DOE) to realize the redistribution of a projection image on the target, a pattern projected on the object is received by a camera lens, and a three-dimensional image containing the position depth information of the projected object can be calculated after certain algorithm processing. The 3D structured light needs to actively emit a fixed spot pattern which is designed in advance and has high precision, so that the three-dimensional structured light has the advantages of being applicable to a dark environment, high in measurement precision, high in resolution and the like, and also has the essential defect that the measurement distance is short. Once the scene is far away, e.g. into an outdoor scene or the depth of the scene exceeds 1-10m, the diffuse spot of the optical pattern will grow, resulting in defocus and increased error.
That is, the imaging device in the related art has a problem that the resolution of the 3D structured light in the distant scene is low.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide an imaging lens assembly and an imaging device, which solve the problem of low resolution of 3D structured light in the existing remote scene of the imaging device in the prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided an imaging lens assembly, including a first imaging lens, a second imaging lens and a third imaging lens which are sequentially disposed at intervals, the first imaging lens, the second imaging lens and the third imaging lens satisfy therebetween: fno of 1.0 <1＜Fno2＜Fno3＜3.0；5.0mm＞F1＞F2＞F3＞1.0mm；P1＜P2＜P3(ii) a Wherein, Fno1F, the f number of the first imaging lens2F, the f number of the second imaging lens3F is the F-number of the third imaging lens1Is the effective focal length of the first imaging lens, F2Is the effective focal length of the second imaging lens, F3Is the effective focal length, P, of the third imaging lens1Is the object distance, P, of the first imaging lens2Is the object distance, P, of the second imaging lens3Is the object distance of the third imaging lens.
Further, the first imaging lens includes at least three lenses having positive optical power; the second imaging lens comprises at least three lenses with positive focal power; the third imaging lens includes at least three lenses having positive optical power.
Furthermore, the first imaging lens comprises at least five plastic lenses; the second imaging lens comprises at least five plastic lenses; the third imaging lens comprises at least five plastic lenses.
Further, the first imaging lens, the second imaging lens and the third imaging lens are all provided with lenses with at least one aspheric lens surface.
Further, the angle of view Fov of the third imaging lens3Greater than the first imaging lens angle of view Fov1And the angle of view Fov of the third imaging lens3Greater than the second imaging lens angle of view Fov2。
Furthermore, any two adjacent lenses in the first imaging lens have air space on the optical axis of the first imaging lens; any two adjacent lenses in the second imaging lens have air space on the optical axis of the first imaging lens; any two adjacent lenses in the third imaging lens have air space on the optical axis of the first imaging lens.
Further, the object distance P of the second imaging lens2500mm or more and 1500mm or less.
Further, the second imaging lens hasEffective focal length F2Effective focal length f of the first lens of the second imaging lens21Effective focal length f of fifth lens of second imaging lens25And an effective focal length f of a sixth lens of the second imaging lens26Satisfy 0.7 < F2/(f21+f25+f26)＜1.0。
Further, a radius of curvature R of a second lens object-side surface of a second lens of the second imaging lens23And the curvature radius R of the second lens image side surface of the second lens of the second imaging lens24And the curvature radius R of the object side surface of the first lens of the second imaging lens21And a radius of curvature R of a first lens image-side surface of a first lens of a second imaging lens22Satisfies 0.4 < (R)23+R24)/(R21+R22)＜0.8。
Further, a distance TTL between an object-side surface of the first lens element of the second imaging lens and an image plane of the second imaging lens is on an optical axis of the second imaging lens2ImgH which is half of diagonal length of effective pixel area on imaging surface of second imaging lens2Satisfy TTL therebetween2/ImgH2＜1.65。
Further, the effective focal length f of the first lens of the third imaging lens31The effective focal length f of the second lens of the third imaging lens32An effective focal length f of a third lens of the third imaging lens33The effective focal length f of the fourth lens of the third imaging lens34An effective focal length f of a fifth lens of the third imaging lens35And an effective focal length f of a sixth lens of the third imaging lens36Satisfy-1.0 < (f)31+f34+f36)/(f32+f33+f35)＜-0.4。
Further, a radius of curvature R of an object-side surface of the fifth lens of the third imaging lens39And the curvature radius R of the image side surface of the fifth lens of the third imaging lens310Satisfies 0.6 < (R)39+R310)/(R39+R310)＜0.9。
Further, the optical axis of the first imaging lens, the optical axis of the second imaging lens and the optical axis of the third imaging lens are all not coaxial.
According to another aspect of the present invention, there is provided an imaging device including the above-mentioned imaging lens group.
Use the technical scheme of the utility model, the imaging lens group is including first imaging lens, second imaging lens and the third imaging lens that set up in proper order at the interval, and the f-number Fno of first imaging lens1F number Fno of the second imaging lens2And f-number Fno of third imaging lens3Satisfy 1.0 < Fno1＜Fno2＜Fno3Less than 3.0; effective focal length F of the first imaging lens1Effective focal length F of the second imaging lens2And effective focal length F of the third imaging lens3Satisfy 5.0mm & gtF1＞F2＞F3Is more than 1.0 mm; object distance P of first imaging lens1The object distance P of the second imaging lens2And object distance P of third imaging lens3Satisfy P1＜P2＜P3。
By arranging the f-numbers, focal lengths and object distances of the first imaging lens, the second imaging lens and the third imaging lens into different gradients, so that the depths of field and the detected distances of the three imaging lenses have different ranges, the finally obtained depth map can use the weighted combination of the three depth maps to increase the resolution of the imaging lens group. Of course, the distribution of the weights of the lenses in the imaging lens group can be different, so that the proportion of the weight of the lens with clearer imaging in the imaging lens group is large, and the depth of field and the imaging resolution of the imaging lens group can be increased. Therefore, partial low-definition regions caused by the fact that the depth of field and the detection distance are not corresponding in the three lenses can be compensated, noise points, blank points or data error points which possibly occur in the depth map of a single lens can be made up, and the imaging resolution of the imaging lens group can be improved aiming at scenes with different shapes and distributions under different distances.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, 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 shows a schematic structural diagram of a first imaging lens according to a first embodiment of the present invention; and
fig. 2 illustrates an on-axis chromatic aberration curve of the first imaging lens of fig. 1;
FIG. 3 illustrates an astigmatism curve of the first imaging lens of FIG. 1;
fig. 4 illustrates a distortion curve of the first imaging lens of fig. 1;
fig. 5 illustrates a chromatic aberration of magnification curve of the first imaging lens in fig. 1;
fig. 6 is a schematic structural diagram of a first imaging lens according to a second embodiment of the present invention;
fig. 7 illustrates an on-axis chromatic aberration curve of the first imaging lens of fig. 6;
fig. 8 illustrates an astigmatism curve of the first imaging lens of fig. 6;
fig. 9 illustrates a distortion curve of the first imaging lens of fig. 6;
fig. 10 illustrates a chromatic aberration of magnification curve of the first imaging lens in fig. 6;
fig. 11 is a schematic structural diagram of a first imaging lens according to a third embodiment of the present invention;
fig. 12 shows on-axis chromatic aberration curves of the first imaging lens in fig. 11;
fig. 13 illustrates an astigmatism curve of the first imaging lens of fig. 11;
fig. 14 illustrates a distortion curve of the first imaging lens of fig. 11;
fig. 15 shows a chromatic aberration of magnification curve of the first imaging lens in fig. 11;
fig. 16 is a schematic structural diagram of a second imaging lens according to a fourth embodiment of the present invention;
fig. 17 shows an on-axis chromatic aberration curve of the second imaging lens in fig. 16;
FIG. 18 illustrates an astigmatism curve for the second imaging lens of FIG. 16;
fig. 19 illustrates a distortion curve of the second imaging lens of fig. 16;
fig. 20 shows a magnification chromatic aberration curve of the second imaging lens in fig. 16;
fig. 21 is a schematic structural diagram of a fifth imaging lens according to an embodiment of the present invention;
fig. 22 shows an on-axis chromatic aberration curve of the second imaging lens in fig. 21;
FIG. 23 illustrates an astigmatism curve of the second imaging lens of FIG. 21;
fig. 24 illustrates a distortion curve of the second imaging lens of fig. 21;
fig. 25 shows a magnification chromatic aberration curve of the second imaging lens in fig. 21;
fig. 26 is a schematic structural diagram illustrating a second imaging lens according to a sixth embodiment of the present invention;
fig. 27 shows an on-axis chromatic aberration curve of the second imaging lens in fig. 26;
FIG. 28 illustrates an astigmatism curve for the second imaging lens of FIG. 26;
fig. 29 shows a distortion curve of the second imaging lens of fig. 26;
fig. 30 shows a magnification chromatic aberration curve of the second imaging lens in fig. 26;
fig. 31 is a schematic structural diagram of a third imaging lens in the seventh embodiment of the present invention;
fig. 32 shows an on-axis chromatic aberration curve of the third imaging lens in fig. 31;
fig. 33 shows an astigmatism curve of the third imaging lens in fig. 31;
fig. 34 shows distortion curves of the third imaging lens in fig. 31;
fig. 35 shows a chromatic aberration of magnification curve of the third imaging lens in fig. 31;
fig. 36 shows a schematic structural diagram of a third imaging lens in the eighth embodiment of the present invention;
fig. 37 shows on-axis chromatic aberration curves of the third imaging lens in fig. 36;
FIG. 38 shows an astigmatism curve for the third imaging lens of FIG. 36;
fig. 39 shows distortion curves of the third imaging lens in fig. 36;
fig. 40 shows a chromatic aberration of magnification curve of the third imaging lens in fig. 36;
fig. 41 shows a schematic structural diagram of a third imaging lens in a ninth embodiment of the present invention;
fig. 42 shows an on-axis chromatic aberration curve of the third imaging lens in fig. 41;
fig. 43 shows an astigmatism curve of the third imaging lens in fig. 41;
fig. 44 illustrates a distortion curve of the third imaging lens of fig. 41;
fig. 45 shows a chromatic aberration of magnification curve of the third imaging lens in fig. 41;
fig. 46 shows a schematic structural view of an image forming apparatus of the present invention.
Wherein the figures include the following reference numerals:
10. a first imaging lens; 20. a second imaging lens; 30. a third imaging lens; e11, a first lens of the first imaging lens; s11, a first lens object side surface of a first lens of the first imaging lens; s12, a first lens image side surface of a first lens of the first imaging lens; e12, a second lens of the first imaging lens; s13, a second lens object side surface of a second lens of the first imaging lens; s14, a second lens image side surface of a second lens of the first imaging lens; e13, a third lens of the first imaging lens; s15, a third lens object side surface of a third lens of the first imaging lens; s16, the third lens image side surface of the third lens of the first imaging lens; e14, a fourth lens of the first imaging lens; s17, a fourth lens object side surface of a fourth lens of the first imaging lens; s18, the fourth lens image side surface of the fourth lens of the first imaging lens; e15, a fifth lens of the first imaging lens; s19, the object side surface of the fifth lens of the first imaging lens; s110, a fifth lens image side surface of a fifth lens of the first imaging lens; e16, a sixth lens of the first imaging lens; s111, a sixth lens object side surface of a sixth lens of the first imaging lens; s112, a sixth lens image side surface of a sixth lens of the first imaging lens; e17, a filter of the first imaging lens; s113, the object side face of a filter of the first imaging lens; s114, the image side face of a filter plate of the first imaging lens; s115, an imaging surface of the first imaging lens; e18, a seventh lens of the first imaging lens; s116, a seventh lens object side surface of a seventh lens of the first imaging lens; s117, a seventh lens image side surface of a seventh lens of the first imaging lens; STO1, stop of first imaging lens; e21, a first lens of a second imaging lens; s21, the object side surface of the first lens of the second imaging lens; s22, the first lens image side surface of the first lens of the second imaging lens; e22, a second lens of the second imaging lens; s23, a second lens object side surface of a second lens of the second imaging lens; s24, a second lens image side surface of a second lens of the second imaging lens; e23, a third lens of the second imaging lens; s25, a third lens object side surface of a third lens of the second imaging lens; s26, the image side surface of the third lens of the second imaging lens; e24, fourth lens of the second imaging lens; s27, a fourth lens object side surface of a fourth lens of the second imaging lens; s28, a fourth lens image-side surface of a fourth lens of the second imaging lens; e25, a fifth lens of the second imaging lens; s29, a fifth lens object side surface of a fifth lens of the second imaging lens; s210, a fifth lens image side surface of a fifth lens of the second imaging lens; e26, a sixth lens of the second imaging lens; s211, a sixth lens object side surface of a sixth lens of the second imaging lens; s212, a sixth lens image side surface of a sixth lens of the second imaging lens; e27, a filter of the second imaging lens; s213, the object side surface of a filter of the second imaging lens; s214, the image side surface of the filter plate of the second imaging lens; s215, an imaging surface of a second imaging lens; STO2, stop of second imaging lens; e31, a first lens of a third imaging lens; s31, a first lens object side surface of a first lens of the third imaging lens; s32, the first lens image side surface of the first lens of the third imaging lens; e32, a second lens of the third imaging lens; s33, a second lens object side surface of a second lens of the third imaging lens; s34, a second lens image-side surface of a second lens of the third imaging lens; e33, a third lens of a third imaging lens; s35, a third lens object-side surface of a third lens of the third imaging lens; s36, a third lens image-side surface of a third lens of the third imaging lens; e34, a fourth lens of the third imaging lens; s37, a fourth lens object-side surface of a fourth lens of the third imaging lens; s38, a fourth lens image-side surface of a fourth lens of the third imaging lens; e35, a fifth lens of the third imaging lens; s39, the object side surface of the fifth lens of the third imaging lens; s310, a fifth lens image side surface of a fifth lens of the third imaging lens; e36, a sixth lens of the third imaging lens; s311, a sixth lens object-side surface of a sixth lens of the third imaging lens; s312, a sixth lens image-side surface of a sixth lens of the third imaging lens; e37, a filter of the third imaging lens; s313, the object side surface of a filter of the third imaging lens; s314, the image side surface of the filter of the third imaging lens; s315, an imaging surface of a third imaging lens; STO3, diaphragm of the third imaging lens.
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 accompanying drawings in conjunction with embodiments.
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 application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; 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 close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. 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. For the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.
In order to solve the problem that imaging device has the resolution ratio low of 3D structured light far away in the scene among the prior art, the utility model provides an imaging lens group and imaging device.
As shown in fig. 1 to 46, the imaging lens group includes a first imaging lens 10, a second imaging lens 20 and a third imaging lens 30 which are sequentially disposed at intervals, and an f-number Fno of the first imaging lens1F number Fno of the second imaging lens2And f-number Fno of third imaging lens3Satisfy 1.0 < Fno1＜Fno2＜Fno3Less than 3.0; effective focal length F of the first imaging lens1Effective focal length F of the second imaging lens2And effective focal length F of the third imaging lens3Satisfy 5.0mm & gtF1＞F2＞F3Is more than 1.0 mm; object distance P of first imaging lens1The object distance P of the second imaging lens2And object distance P of third imaging lens3Satisfy P1＜P2＜P3。
By arranging the f-numbers, focal lengths and object distances of the first imaging lens 10, the second imaging lens 20 and the third imaging lens 30 to be different gradients so that the depths of field and the detected distances of the three imaging lenses have different ranges, the finally obtained depth map can use a weighted combination of the three depth maps to increase the resolution of the imaging by the imaging lens group. Of course, the distribution of the weights of the lenses in the imaging lens group can be different, so that the proportion of the weight of the lens with clearer imaging in the imaging lens group is large, and the depth of field and the imaging resolution of the imaging lens group can be increased. Therefore, partial low-definition regions caused by the fact that the depth of field and the detection distance are not corresponding in the three imaging lenses can be compensated, noise points, blank points or data error points which possibly occur in a depth map of a single imaging lens can be made up, and the imaging resolution of the imaging lens group can be improved aiming at scenes with different shapes and distributions under different distances.
Specifically, the second imaging lens is selected as the predetermined lens, the image error formed by the predetermined lens is a2, the image error formed by the first imaging lens is a1, the image error formed by the third imaging lens is a3, a1, a2 and a3 are compared, when a1> a2 and a3> a2, the weight of the corresponding depth of the image formed by the predetermined lens is increased, and when a1< a2 and a3> a2, the weight of the corresponding depth of the image formed by the first imaging lens is increased; when a1> a2 and a3< a2, increasing the weight of the depth corresponding to the image formed by the third imaging lens; when a1< a2 and a3< a2, the weight of the depth corresponding to the image formed by the first imaging lens and the weight of the depth corresponding to the image formed by the third imaging lens are simultaneously increased. The contrast of the image formed by the predetermined lens is b2, the contrast of the image formed by the first imaging lens is b1, the contrast of the image formed by the third imaging lens is b3, b1, b2 and b3 are compared, the weight of the depth corresponding to the image formed by the predetermined lens is increased when b1< b2 and b3< b2, the weight of the depth corresponding to the image formed by the third imaging lens is increased when b1< b2 and b3> b2, the weight of the depth corresponding to the image formed by the first imaging lens is increased when b1> b2 and b3< b2, and the weight of the depth corresponding to the image formed by the first imaging lens and the weight of the depth corresponding to the image formed by the third imaging lens are increased simultaneously when b1> b2 and b3> b 2. It should be noted that the predetermined lens may be the first imaging lens or the third imaging lens, only the second imaging lens is used as the predetermined lens for description, and the imaging lens with the image error a1 may be the third imaging lens or the second imaging lens, not only the first imaging lens, and for convenience of description, a1 corresponds to the first imaging lens, and a3 corresponds to the third imaging lens.
The imaging lens group can select a lens needed by the three imaging lenses according to the position, brightness, depth of field, resolution and the like of the image collected by the imaging lens group to perform shooting and imaging.
Specifically, the first imaging lens 10 includes at least three lenses having positive refractive power; the second imaging lens 20 includes at least three lenses having positive optical power; the third imaging lens 30 includes at least three lenses having positive optical power. The focal power of each imaging lens is reasonably configured, the deflection angle of light rays between the lenses can be reduced, and the sensitivity of the lenses is reduced, so that the tolerance condition is relaxed, the process difficulty of the imaging lens group is reduced, and the imaging lens group is convenient to manufacture.
Optionally, the first imaging lens 10 includes at least five plastic lenses; the second imaging lens 20 includes at least five plastic lenses; the third imaging lens 30 includes at least five plastic lenses. The materials of the lenses in the three imaging lenses are reasonably configured, so that the material cost can be saved, the process flow can be simplified, the weight of the imaging lenses can be reduced, and the trend of lightening and thinning of the imaging lenses is met.
The first imaging lens 10, the second imaging lens 20, and the third imaging lens 30 each have a lens in which at least one lens mirror surface is aspherical. The introduction of the aspheric mirror surface into the imaging lens can not only greatly increase the degree of freedom in optical design, but also correct most of aberrations (spherical aberration, coma aberration, field region, distortion, etc.), thereby further improving the imaging quality of the imaging lens group. 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.
Angle of view Fov of third imaging lens3Greater than the first imaging lens angle of view Fov1And the angle of view Fov of the third imaging lens3Greater than the second imaging lens angle of view Fov2. The imaging lens group can improve the imaging height of the imaging lens group, and can also avoid the overlarge aberration of the marginal field of view of the imaging lens group, so that the imaging lens group has the characteristics of wide imaging range and high imaging quality, the visual range of the imaging lens group during imaging is effectively increased, and the shooting experience effect of a user is increased.
Specifically, any two adjacent lenses in the first imaging lens have an air space on the optical axis of the first imaging lens; any two adjacent lenses in the second imaging lens have air space on the optical axis of the second imaging lens; any two adjacent lenses in the third imaging lens have air space on the optical axis of the third imaging lens. Air intervals between adjacent lenses in the three imaging lenses are reasonably configured, deflection of light rays between the lenses can be relieved, collision between the adjacent lenses during assembly can be reduced, and scratches of the lenses are reduced. Of course, a spacer or a spacer ring can be added at the air space between adjacent lenses according to the requirement, so that the stability of the imaging lens structure can be enhanced, the imaging lens can be kept miniaturized, and the stray light of the system can be improved.
Object distance P of second imaging lens2500mm or more and 1500mm or less. Because the diffuse spot of the optical pattern is continuously enlarged when the scene distance is from near to far, the defocusing and the error are easily causedAnd reasonably controlling the distance from an object in the second imaging lens 20 to the object side of the first lens of the second lens on the optical axis of the second imaging lens, so that the initial weight of the second imaging lens 20 is larger, and increasing or decreasing the weights of the first imaging lens 10 and the third imaging lens in real time according to the depth of field measured by the second imaging lens 20 in real time, so as to effectively improve the imaging efficiency and the frame number and increase the imaging definition.
Effective focal length F of the second imaging lens2Effective focal length f of the first lens of the second imaging lens21Effective focal length f of fifth lens of second imaging lens25And an effective focal length f of a sixth lens of the second imaging lens26Satisfy 0.7 < F2/(f21+f25+f26) Is less than 1.0. By reasonably controlling the range of the conditional expression, the excessive concentration of focal power can be avoided, the aberration correction capability of the system can be well improved, and meanwhile, the size of the second imaging lens can be effectively reduced so as to realize the lightness and thinness of the second imaging lens.
Specifically, the radius of curvature R of the second lens object-side surface of the second lens of the second imaging lens23And the curvature radius R of the second lens image side surface of the second lens of the second imaging lens24And the curvature radius R of the object side surface of the first lens of the second imaging lens21And a radius of curvature R of a first lens image-side surface of a first lens of a second imaging lens22Satisfies 0.4 < (R)23+R24)/(R21+R22) Is less than 0.8. By controlling the curvature radius of the first lens of the second imaging lens and the curvature radius of the second lens of the second imaging lens, the second imaging lens 20 can well realize the deflection of the optical path, so as to balance the high-level spherical aberration generated by the second imaging lens 20.
In the second imaging lens 20, the distance TTL between the object-side surface of the first lens element of the first imaging lens and the image plane of the second imaging lens is on the optical axis of the second imaging lens2ImgH which is half of diagonal length of effective pixel area on imaging surface of second imaging lens2Satisfy TTL therebetween2/ImgH2Is less than 1.65. By controlling the first lens of the first lens in the second imaging lens 20The ratio of the distance between the object side surface and the imaging surface of the second imaging lens on the optical axis of the second imaging lens to the half of the diagonal length of the effective pixel area on the imaging surface of the second imaging lens is in a reasonable range, so that the optical system of the second imaging lens has a short length, the optical system of the second imaging lens can be ensured to have a large enough image surface, more detailed information of a shot object can be presented, and imaging is clearer.
Effective focal length f of first lens of third imaging lens31The effective focal length f of the second lens of the third imaging lens32An effective focal length f of a third lens of the third imaging lens33The effective focal length f of the fourth lens of the third imaging lens34An effective focal length f of a fifth lens of the third imaging lens35And an effective focal length f of a sixth lens of the third imaging lens36Satisfy-1.0 < (f)31+f34+f36)/(f32+f33+f35) < -0.4. By reasonably distributing the focal power of each lens of the third imaging lens, the contribution amount of the curvature of field of each lens can be reasonably controlled, so that the curvature of field of the third imaging lens is controlled within a reasonable range.
Radius of curvature R of fifth lens object-side surface of fifth lens of third imaging lens39And the curvature radius R of the image side surface of the fifth lens of the third imaging lens310Satisfies 0.6 < (R)39+R310)/(R39+R310) Is less than 0.9. The deflection angle of the marginal light of the optical imaging system of the third imaging lens can be reasonably controlled by the arrangement, and the sensitivity of the optical imaging system of the third imaging lens can be effectively reduced.
The optical axis of the first imaging lens, the optical axis of the second imaging lens and the optical axis of the third imaging lens are all not coaxial. Set up like this and be convenient for compare the difference in height of three imaging lens, make things convenient for the assembly of module. When the three imaging lenses are assembled, the appropriate total TTL lengths are selected, so that the height differences of the three imaging lenses are in a reasonable range.
The imaging lens group in this application can improve 3D structure light depth detection resolution ratio in more remote scene, realizes obtaining more accurate effectual depth image.
Optionally, the imaging device comprises the imaging lens group described above. The imaging device can shoot objects with multiple depth of field, and the imaging definition of the imaging device is improved. The imaging device can be a mobile phone, a tablet computer or a computer.
Examples of specific surface types and parameters of the imaging lens group applicable to the above-described embodiments are further described below with reference to the drawings. It should be noted that the first to third embodiments mainly exemplify the first imaging lens 10, the fourth to sixth embodiments mainly exemplify the second imaging lens 20, and the seventh to ninth embodiments mainly exemplify the third imaging lens 30. The first imaging lens 10, the second imaging lens 20, and the third imaging lens 30 in the embodiment may be arbitrarily combined. Of course, the present invention may be combined with other embodiments not mentioned in the present application, and only some of the above conditional expressions need to be satisfied.
Example one
Note that, in the present embodiment, the first imaging lens 10 is defined.
As shown in fig. 1, the first imaging lens 10 includes, in order from an object side to an image side along an optical axis: the first lens E11 of the first imaging lens, the second lens E12 of the first imaging lens, the stop STO1 of the first imaging lens, the third lens E13 of the first imaging lens, the fourth lens E14 of the first imaging lens, the fifth lens E15 of the first imaging lens, the sixth lens E16 of the first imaging lens, the filter E17 of the first imaging lens, and the imaging surface S115 of the first imaging lens.
The first lens E11 of the first imaging lens has negative focal power, the first lens object-side surface S11 of the first lens of the first imaging lens is convex, and the first lens image-side surface S12 of the first lens of the first imaging lens is concave; the second lens E12 of the first imaging lens has positive focal power, the second lens object-side surface S13 of the second lens of the first imaging lens is convex, and the second lens image-side surface S14 of the second lens of the first imaging lens is concave; the third lens element E13 of the first imaging lens has positive refractive power, the object-side surface S15 of the third lens element of the first imaging lens is convex, and the image-side surface S16 of the third lens element of the first imaging lens is convex; the fourth lens E14 of the first imaging lens has negative focal power, the fourth lens object-side surface S17 of the fourth lens of the first imaging lens is a concave surface, and the fourth lens image-side surface S18 of the fourth lens of the first imaging lens is a concave surface; the fifth lens element E15 of the first imaging lens has positive refractive power, the fifth lens object-side surface S19 of the fifth lens element of the first imaging lens is convex, and the fifth lens image-side surface S110 of the fifth lens element of the first imaging lens is convex; the sixth lens element E16 of the first imaging lens has positive refractive power, the sixth lens object-side surface S111 of the sixth lens element of the first imaging lens is convex, and the sixth lens image-side surface S112 of the sixth lens element of the first imaging lens is concave. The filter E17 of the first imaging lens has a filter object-side surface S113 of the first imaging lens and a filter image-side surface S114 of the first imaging lens. The light from the object passes through the surfaces in sequence and is finally imaged on the imaging surface S115 of the first imaging lens. The first table shows the surface type, the radius of curvature, the thickness, the material and the conic coefficient of each lens of the first imaging lens in this embodiment, wherein the unit of the radius of curvature and the thickness are both millimeters.
Table one: detailed optical data of the first imaging lens in this embodiment
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Material of | Coefficient of cone |
| OBJ | Spherical surface | All-round | 125.0000 | |||
| S11 | Aspherical surface | 203.8253 | 0.7155 | 1.55,56.1 | Plastic cement | 0.0000 |
| S12 | Aspherical surface | 4.0951 | 1.9622 | -0.3795 | ||
| S13 | Aspherical surface | 3.9799 | 0.8023 | 1.62,25.9 | Plastic cement | 0.2138 |
| S14 | Aspherical surface | 5.5537 | 1.2328 | 6.6372 | ||
| STO1 | Spherical surface | All-round | 0.1449 | 0.0000 | ||
| S15 | Aspherical surface | 9.9565 | 1.5633 | 1.55,56.1 | Plastic cement | 9.3748 |
| S16 | Aspherical surface | -4.1987 | 0.9177 | 1.6145 | ||
| S17 | Aspherical surface | -8.5542 | 0.5875 | 1.68,19.2 | Plastic cement | 5.1264 |
| S18 | Aspherical surface | 21.5077 | 0.1746 | 0.0000 | ||
| S19 | Aspherical surface | 17.3420 | 2.1748 | 1.55,56.1 | Plastic cement | -71.1483 |
| S110 | Aspherical surface | -5.0220 | 0.8877 | 0.3090 | ||
| S111 | Aspherical surface | 2.1324 | 0.9307 | 1.64,24.0 | Plastic cement | -3.3479 |
| S112 | Aspherical surface | 1.8162 | 1.0338 | -2.3649 | ||
| S113 | Spherical surface | All-round | 0.2750 | 1.52,64.2 | Glass | |
| S114 | Spherical surface | All-round | 1.4474 | |||
| S115 | Spherical surface | All-round |
In this example, each lens may be an aspherical lens, and each aspherical surface type x is defined by the following formula:
wherein x is the distance rise from the aspheric surface vertex at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface,
(i.e., paraxial curvature c is the inverse of radius of curvature R in Table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the i-th order of the aspherical surface.
Table two shows the high-order term coefficients of the aspherical surfaces of the aspherical lenses that can be used for the first imaging lens in this embodiment.
Table two: in the present embodiment, the high-order coefficient of each aspherical surface of the first imaging lens
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 |
| S11 | 3.1845E-01 | -2.4964E-01 | 1.4422E-01 | -5.7906E-02 | 1.5901E-02 | -2.8300E-03 | 2.9300E-04 | -1.4000E-05 |
| S12 | 7.7940E-03 | -8.6000E-04 | -1.7000E-05 | 9.1053E-06 | -6.7076E-07 | 1.5308E-08 | 0.0000E+00 | 0.0000E+00 |
| S13 | -6.8000E-04 | 5.5100E-04 | -2.0000E-04 | 5.6110E-05 | -4.8774E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S14 | 3.9100E-03 | 2.7800E-04 | 2.1300E-04 | -2.1053E-05 | 7.8463E-06 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S15 | -9.5000E-04 | -2.2000E-04 | -2.1000E-06 | -1.8620E-05 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S16 | -8.6290E-02 | 1.3765E-02 | 1.9792E-01 | -1.0014E+00 | 1.2750E+00 | 1.0369E+00 | -3.4444E+00 | 1.9606E+00 |
| S17 | -2.9654E-01 | -9.3142E-01 | 5.2641E+00 | -1.4012E+01 | 2.1609E+01 | -2.0168E+01 | 1.0530E+01 | -2.3184E+00 |
| S18 | -1.0726E-01 | -1.4407E+00 | 4.7781E+00 | -8.0142E+00 | 8.1749E+00 | -5.0581E+00 | 1.7430E+00 | -2.5635E-01 |
| S19 | 1.5441E-01 | -1.3405E+00 | 2.8239E+00 | -3.5770E+00 | 2.9570E+00 | -1.5127E+00 | 4.3100E-01 | -5.2460E-02 |
| S110 | -7.9276E-01 | 1.9889E+00 | -3.3304E+00 | 3.7208E+00 | -2.6976E+00 | 1.2138E+00 | -3.0118E-01 | 3.0980E-02 |
| S111 | -4.4433E-01 | -2.2900E-03 | 4.6742E-02 | 2.3050E-03 | -1.2896E-02 | 5.2770E-03 | -8.9000E-04 | 5.6500E-05 |
| S112 | -5.2543E-01 | 2.4845E-01 | -8.1480E-02 | 1.6561E-02 | -1.8501E-03 | 7.6800E-05 | 3.7200E-06 | -3.5000E-07 |
Table three shows the effective focal length F of the first imaging lens in this embodiment1Effective focal length f of each lens of the first imaging lens11To f16The first lens object side surface S11 of the first imaging lens to the first imaging lensDistance TTL of imaging surface S115 on optical axis1And ImgH which is half the diagonal length of the effective pixel area on the imaging surface of the first imaging lens1F number Fno of the first imaging lens1Object distance P of the first imaging lens1And a maximum half-market field angle Semi-FOV1 of the first imaging lens.
Table three: parameters of optical imaging lens
| |
1 |
| f11(mm) | -7.66 |
| f12(mm) | 18.93 |
| f13(mm) | 5.62 |
| f14(mm) | -8.94 |
| f15(mm) | 7.38 |
| f16(mm) | 126.89 |
| F1(mm) | 4.25 |
| TTL1(mm) | 14.85 |
| ImgH1(mm) | 7.62 |
| Fno1 | 1.94 |
| P1(mm) | 125.00 |
| Semi-FOV1(°) | 60.2 |
In the embodiment, the length of the first imaging lens 10 from the first lens object side surface S11 of the first lens of the first imaging lens to the imaging surface S115 of the first imaging lens on the optical axis is 14.85mm, the effective focal length of the first imaging lens is 4.25mm, the imaging height of the first imaging lens is 7.62mm, the maximum half field angle of the first imaging lens is 60.2 degrees, the aperture value of the first imaging lens is 1.94, and the object distance of the first imaging lens is 125 mm. This example has guaranteed great light ring when guaranteeing the miniaturization of optical imaging lens, can acquire more light inlet volume, reduces optical aberration when light is not enough, promotes the image acquisition quality, acquires stable formation of image effect. Note that the larger the aperture value, the smaller the aperture, and the smaller the aperture value, the larger the aperture.
Fig. 2 shows an on-axis chromatic aberration curve on the first imaging lens 10 in this embodiment, which indicates that the converging focal points of the light rays with different wavelengths after passing through the optical system deviate, so that the image focal planes of the light rays with different wavelengths cannot coincide at the time of final imaging, and the polychromatic light spreads to form chromatic dispersion. Fig. 3 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the first imaging lens in the present embodiment. Fig. 4 shows distortion curves of the first imaging lens in the present embodiment, which represent distortion magnitude values in the case of different angles of view. Fig. 5 shows a chromatic aberration of magnification curve of the first imaging lens in the present embodiment, which represents a phase difference of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 2 to 5, the first imaging lens 10 of the present embodiment is suitable for portable electronic products, and has a large aperture and good imaging quality.
Example two
In embodiment two, the first imaging lens 10 is defined.
As shown in fig. 6, the first imaging lens 10 includes, in order from an object side to an image side along an optical axis: a stop STO1 of the first imaging lens, a first lens E11 of the first imaging lens, a second lens E12 of the first imaging lens, a third lens E13 of the first imaging lens, a fourth lens E14 of the first imaging lens, a fifth lens E15 of the first imaging lens, a sixth lens E16 of the first imaging lens, a filter E17 of the first imaging lens, and an imaging surface S115 of the first imaging lens.
The first lens E11 of the first imaging lens has positive focal power, the first lens object-side surface S11 of the first lens of the first imaging lens is convex, and the first lens image-side surface S12 of the first lens of the first imaging lens is concave; the second lens E12 of the first imaging lens has negative focal power, the second lens object-side surface S13 of the second lens of the first imaging lens is convex, and the second lens image-side surface S14 of the second lens of the first imaging lens is concave; the third lens element E13 of the first imaging lens has positive refractive power, the object-side surface S15 of the third lens element of the first imaging lens is convex, and the image-side surface S16 of the third lens element of the first imaging lens is convex; the fourth lens element E14 of the first imaging lens has negative refractive power, the fourth lens object-side surface S17 of the fourth lens element of the first imaging lens is concave, and the fourth lens image-side surface S18 of the fourth lens element of the first imaging lens is convex; the fifth lens element E15 of the first imaging lens has positive refractive power, the fifth lens object-side surface S19 of the fifth lens element of the first imaging lens is convex, and the fifth lens image-side surface S110 of the fifth lens element of the first imaging lens is concave; the sixth lens element E16 of the first imaging lens has negative refractive power, the sixth lens object-side surface S111 of the sixth lens element of the first imaging lens is convex, and the sixth lens image-side surface S112 of the sixth lens element of the first imaging lens is concave. The filter E17 of the first imaging lens has a filter object-side surface S113 of the first imaging lens and a filter image-side surface S114 of the first imaging lens. The light from the object passes through the surfaces in sequence and is finally imaged on the imaging surface S115 of the first imaging lens. Table four shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the first imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters.
Table four: detailed optical data of the first imaging lens in this embodiment
Table five shows the high-order term coefficients of the respective aspherical surfaces of the respective aspherical surface lenses usable for the first imaging lens in this embodiment.
Table five: in the present embodiment, the high-order coefficient of each aspherical surface of the first imaging lens
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S11 | 7.5922E-02 | 5.9110E-03 | -6.3790E-02 | 2.2741E-01 | -4.4463E-01 | 5.1562E-01 | -3.5577E-01 | 1.3365E-01 | -2.1580E-02 |
| S12 | -9.6610E-02 | 8.6615E-02 | -5.2858E-02 | 2.0801E-02 | -4.1650E-02 | 5.2897E-02 | -3.2630E-02 | 1.0187E-02 | -1.6100E-03 |
| S13 | -1.5950E-01 | 2.3906E-01 | -2.8853E-01 | 9.1258E-01 | -2.3990E+00 | 3.7090E+00 | -3.3005E+00 | 1.5910E+00 | -3.2235E-01 |
| S14 | -8.8890E-02 | 2.1674E-01 | -3.0903E-01 | 1.0098E+00 | -2.2780E+00 | 2.7218E+00 | -1.2338E+00 | -3.4508E-01 | 3.9453E-01 |
| S15 | -9.5190E-02 | 3.5466E-02 | -2.6797E-01 | 2.6353E-01 | 7.7197E-01 | -3.4584E+00 | 5.5847E+00 | -4.3002E+00 | 1.3274E+00 |
| S16 | -1.1818E-01 | 3.6250E-02 | 1.7945E-01 | -1.1608E+00 | 2.5723E+00 | -3.2040E+00 | 2.4475E+00 | -1.0939E+00 | 2.2009E-01 |
| S17 | -2.1277E-01 | 1.6408E-01 | 4.6623E-01 | -1.8017E+00 | 3.1395E+00 | -2.9786E+00 | 1.5461E+00 | -4.0599E-01 | 4.0585E-02 |
| S18 | -2.5568E-01 | 1.7308E-01 | 1.5204E-01 | -5.8505E-01 | 8.7158E-01 | -7.0276E-01 | 3.1419E-01 | -7.3640E-02 | 7.0930E-03 |
| S19 | -8.9010E-02 | -2.5310E-02 | 4.7413E-02 | -5.0680E-02 | 3.4693E-02 | -1.4810E-02 | 3.7950E-03 | -5.3000E-04 | 3.0300E-05 |
| S110 | -6.7800E-03 | -2.1740E-02 | -5.3825E-03 | 1.2792E-02 | -7.8900E-03 | 2.6910E-03 | -5.4000E-04 | 6.0000E-05 | -2.8000E-06 |
| S111 | -3.3742E-01 | 1.9049E-01 | -8.8770E-02 | 3.1305E-02 | -7.4600E-03 | 1.1550E-03 | -1.1000E-04 | 6.2500E-06 | -1.5000E-07 |
| S112 | -1.6231E-01 | 9.3393E-02 | -4.3358E-02 | 1.4023E-02 | -2.9900E-03 | 4.1200E-04 | -3.6000E-05 | 1.7800E-06 | -3.9000E-08 |
Table six shows the effective focal length F of the first imaging lens in this embodiment1Effective focal length f of each lens of the first imaging lens11To f16TTL (distance between object side surface S11 of first lens of first imaging lens and imaging surface S115 of first imaging lens on optical axis)1And ImgH which is half the diagonal length of the effective pixel area on the imaging surface of the first imaging lens1F number Fno of the first imaging lens1Object distance P of the first imaging lens1And a maximum half-market field angle Semi-FOV1 of the first imaging lens.
Table six: parameters of optical imaging lens
In the embodiment, the length of the first imaging lens 10 from the first lens object side surface S11 of the first lens of the first imaging lens to the imaging surface S115 of the first imaging lens on the optical axis is 5.33mm, the effective focal length of the first imaging lens is 4.31mm, the imaging height of the first imaging lens is 3.89mm, the maximum half field angle of the first imaging lens is 38.9 degrees, the aperture value of the first imaging lens is 1.80, and the object distance of the first imaging lens is 105 mm. This example has guaranteed great light ring when guaranteeing the miniaturization of optical imaging lens, can acquire more light inlet volume, reduces optical aberration when light is not enough, promotes the image acquisition quality, acquires stable formation of image effect. Note that the larger the aperture value, the smaller the aperture, and the smaller the aperture value, the larger the aperture.
Fig. 7 shows an on-axis chromatic aberration curve on the first imaging lens 10 in the present embodiment, which indicates that the converging focal points of the light rays with different wavelengths after passing through the optical system are deviated, so that the image focal planes of the light rays with different wavelengths cannot coincide at the time of final imaging, and the polychromatic light is dispersed to form chromatic dispersion. Fig. 8 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the first imaging lens in the present embodiment. Fig. 9 shows distortion curves of the first imaging lens in the present embodiment, which represent distortion magnitude values in the case of different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the first imaging lens in the present embodiment, which represents a phase difference of different image heights on the imaging surface after light passes through the optical imaging lens. As can be seen from fig. 6 to 10, the first imaging lens 10 in the present embodiment is suitable for portable electronic products, and has a large aperture and good imaging quality.
EXAMPLE III
Note that, in the present embodiment, the first imaging lens 10 is defined.
As shown in fig. 11, the first imaging lens 10 includes, in order from an object side to an image side along an optical axis: the first lens E11 of the first imaging lens, the second lens E12 of the first imaging lens, the third lens E13 of the first imaging lens, the fourth lens E14 of the first imaging lens, the fifth lens E15 of the first imaging lens, the sixth lens E16 of the first imaging lens, the seventh lens E18 of the first imaging lens, the filter E17 of the first imaging lens, and the imaging surface S115 of the first imaging lens. Note that in this embodiment, the third lens image-side surface S16 of the third lens of the first imaging lens serves as the stop STO1 of the first imaging lens.
The first lens E11 of the first imaging lens has positive focal power, the first lens object-side surface S11 of the first lens of the first imaging lens is convex, and the first lens image-side surface S12 of the first lens of the first imaging lens is concave; the second lens E12 of the first imaging lens has negative focal power, the second lens object-side surface S13 of the second lens of the first imaging lens is convex, and the second lens image-side surface S14 of the second lens of the first imaging lens is concave; the third lens element E13 of the first imaging lens has positive refractive power, the object-side surface S15 of the third lens element of the first imaging lens is convex, and the image-side surface S16 of the third lens element of the first imaging lens is concave; the fourth lens element E14 of the first imaging lens has negative refractive power, the fourth lens object-side surface S17 of the fourth lens element of the first imaging lens is concave, and the fourth lens image-side surface S18 of the fourth lens element of the first imaging lens is convex; the fifth lens element E15 of the first imaging lens has positive refractive power, the fifth lens object-side surface S19 of the fifth lens element of the first imaging lens is concave, and the fifth lens image-side surface S110 of the fifth lens element of the first imaging lens is convex; the sixth lens element E16 of the first imaging lens has positive refractive power, the sixth lens object-side surface S111 of the sixth lens element of the first imaging lens is convex, and the sixth lens image-side surface S112 of the sixth lens element of the first imaging lens is convex; the seventh lens element E18 of the first imaging lens has negative refractive power, the seventh object-side surface S116 of the seventh lens element of the first imaging lens is convex, and the seventh image-side surface S117 of the seventh lens element of the first imaging lens is concave; the filter E17 of the first imaging lens has a filter object-side surface S113 of the first imaging lens and a filter image-side surface S114 of the first imaging lens. The light from the object passes through the surfaces in sequence and is finally imaged on the imaging surface S115 of the first imaging lens. Table seven shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the first imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters.
TABLE VII: detailed optical data of the first imaging lens in this embodiment
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Material of | Coefficient of cone |
| 0BJ | Spherical surface | All-round | 58.8000 | |||
| S11 | Aspherical surface | 1.7274 | 0.7221 | 1.55，56.1 | Plastic cement | -0.2584 |
| S12 | Aspherical surface | 4.7592 | 0.0811 | -0.8037 | ||
| S13 | Aspherical surface | 2.7861 | 0.2156 | 1.67，20.4 | Plastic cement | -18.6301 |
| S14 | Aspherical surface | 1.7505 | 0.0945 | -4.4023 | ||
| S15 | Aspherical surface | 2.5849 | 0.5398 | 1.55，56.1 | Plastic cement | -0.4658 |
| S16(STO) | Aspherical surface | 12.6138 | 0.3583 | 0.0000 | ||
| S17 | Aspherical surface | -17.0146 | 0.4267 | 1.67，20.4 | Plastic cement | 97.3264 |
| S18 | Aspherical surface | -3185.9400 | 0.2831 | 99.0000 | ||
| S19 | Aspherical surface | -20.9991 | 0.4210 | 1.66，21.5 | Plastic cement | 99.0000 |
| S110 | Aspherical surface | -13.9313 | 0.2374 | 49.5587 | ||
| S111 | Aspherical surface | 4.5013 | 0.4684 | 1.55，56.1 | Plastic cement | -0.1782 |
| S112 | Aspherical surface | -869.7100 | 0.3134 | 99.0000 | ||
| S116 | Aspherical surface | 5.0191 | 0.2373 | 1.55，56.1 | Plastic cement | -0.4644 |
| S117 | Aspherical surface | 1.3821 | 0.2032 | -7.2797 | ||
| S113 | Spherical surface | All-round | 0.1078 | 1.52，64.2 | Glass | |
| S114 | Spherical surface | All-round | 0.5429 | |||
| S115 | Spherical surface | All-round |
Table eight shows the high-order term coefficients of the aspherical surfaces of the aspherical surface lenses that can be used for the first imaging lens in this embodiment.
Table eight: in the present embodiment, the high-order coefficient of each aspherical surface of the first imaging lens
| Flour mark | A4 | A6 | A8 | A10 | A 2 | A14 | A16 | A18 | A20 |
| S11 | 6.0140E-03 | 8.6398E-04 | -1.0120E-02 | 3.2354E-02 | -5.1790E-02 | 4.6076E-02 | -2.3330E-02 | 6.1290E-03 | -6.4000E-04 |
| S12 | 1.3440E-03 | 1.6632E-02 | -6.5720E-02 | 8.0595E-02 | -3.9920E-02 | -1.3460E-02 | 2.7181E-02 | -1.2340E-02 | 1.9360E-03 |
| S13 | 1.4640E-02 | -8.3191E-03 | -9.8080E-02 | 2.5346E-01 | -3.2867E-01 | 2.5731E-01 | -1.1945E-01 | 3.0605E-02 | -3.4300E-03 |
| S14 | -2.4890E-02 | 8.7649E-02 | -2.5107E-01 | 4.0797E-01 | -3.3694E-01 | 4.1220E-02 | 1.6168E-01 | -1.1721E-01 | 2.4781E-02 |
| S15 | -1.9540E-02 | 1.3046E-02 | 5.8465E-02 | -3.9818E-01 | 1.0036E+00 | -1.3908E+00 | 1.1115E+00 | -4.7125E-01 | 8.1858E-02 |
| S16 | -5.3000E-04 | -1.0060E-01 | 3.2948E-01 | -6.0082E-01 | 5.2905E-01 | -4.5090E-02 | -3.1704E-01 | 2.5033E-01 | -6.1480E-02 |
| S17 | -7.1040E-02 | -8.2782E-02 | 1.6722E-01 | -1.8633E-01 | -2.6216E-01 | 1.0369E+00 | -1.2947E+00 | 7.5447E-01 | -1.7366E-01 |
| S18 | -5.6890E-02 | -2.2348E-02 | -1.2600E-02 | 5.8332E-02 | -1.0669E-01 | 1.1411E-01 | -6.6300E-02 | 1.9297E-02 | -2.0700E-03 |
| S19 | -1.4920E-02 | -4.8469E-02 | 1.4602E-01 | -3.9592E-01 | 6.0401E-01 | -5.7412E-01 | 3.3227E-01 | -1.0612E-01 | 1.4203E-02 |
| S110 | -3.6130E-02 | -7.3929E-03 | -3.2000E-03 | 4.9333E-02 | -7.7870E-02 | 5.6487E-02 | -2.1610E-02 | 4.2140E-03 | -3.3000E-04 |
| S111 | 2.4373E-02 | -1.3636E-01 | 5.5555E-02 | 2.3777E-02 | -4.1170E-02 | 2.2827E-02 | -6.5400E-03 | 9.6000E-04 | -5.7000E-05 |
| S112 | 1.9724E-01 | -2.5974E-01 | 1.7125E-01 | -7.5080E-02 | 2.2189E-02 | -4.3400E-03 | 5.4200E-04 | -3.9000E-05 | 1.2900E-06 |
| S116 | -2.3447E-01 | 1.5384E-01 | -6.4510E-02 | 1.7630E-02 | -3.1000E-03 | 3.4600E-04 | -2.4000E-05 | 8.8300E-07 | -1.4000E-08 |
| S117 | -1.4993E-01 | 9.3089E-02 | -4.3160E-02 | 1.4316E-02 | -3.2400E-03 | 4.8300E-04 | -4.5000E-05 | 2.3700E-06 | -5.4000E-08 |
Table nine shows the effective focal length F of the first imaging lens in this embodiment1Effective focal length f of each lens of the first imaging lens11To f17TTL (distance between object side surface S11 of first lens of first imaging lens and imaging surface S115 of first imaging lens on optical axis)1And ImgH which is half the diagonal length of the effective pixel area on the imaging surface of the first imaging lens1F number Fno of the first imaging lens1Object distance P of the first imaging lens1And a maximum half-market field angle Semi-FOV1 of the first imaging lens. In addition, f is17Is an effective focal length of the seventh lens E18 of the first imaging lens.
Table nine: parameters of optical imaging lens
| |
3 |
| f11(mm) | 4.58 |
| f12(mm) | -7.70 |
| f13(mm) | 5.84 |
| f14(mm) | -25.63 |
| f15(mm) | 61.45 |
| f16(mm) | 8.20 |
| f17(mm) | -3.57 |
| F1(mm) | 4.05 |
| TTL1(mm) | 5.25 |
| ImgH1(mm) | 3.58 |
| Fno1 | 1.48 |
| P1(mm) | 58.80 |
| Semi-FOV1(°) | 36.8 |
In the embodiment, the length of the first imaging lens 10 from the first lens object side surface S11 of the first lens of the first imaging lens to the imaging surface S115 of the first imaging lens on the optical axis is 5.25mm, the effective focal length of the first imaging lens is 4.05mm, the imaging height of the first imaging lens is 3.58mm, the maximum half field angle of the first imaging lens is 36.8 degrees, the aperture value of the first imaging lens is 1.48, and the object distance of the first imaging lens is 58.8 mm. This example has guaranteed great light ring when guaranteeing the miniaturization of optical imaging lens, can acquire more light inlet volume, reduces optical aberration when light is not enough, promotes the image acquisition quality, acquires stable formation of image effect. Note that the larger the aperture value, the smaller the aperture, and the smaller the aperture value, the larger the aperture.
Fig. 12 shows an on-axis chromatic aberration curve on the first imaging lens 10 in the present embodiment, which indicates that the converging focal points of the light rays with different wavelengths after passing through the optical system are deviated, so that the image focal planes of the light rays with different wavelengths at the time of final imaging cannot coincide, and the polychromatic light is dispersed to form chromatic dispersion. Fig. 13 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the first imaging lens in the present embodiment. Fig. 14 shows distortion curves of the first imaging lens in the present embodiment, which represent distortion magnitude values in the case of different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the first imaging lens in the present embodiment, which represents a phase difference of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 12 to 15, the first imaging lens 10 in the present embodiment is suitable for portable electronic products, and has a large aperture and good imaging quality.
Example four
In this embodiment, the second imaging lens 20 is defined.
As shown in fig. 16, the second imaging lens 20 includes, in order from the object side to the image side along the optical axis: stop STO2 of the second imaging lens, first lens E21 of the second imaging lens, second lens E22 of the second imaging lens, third lens E23 of the second imaging lens, fourth lens E24 of the second imaging lens, fifth lens E25 of the second imaging lens, sixth lens E26 of the second imaging lens, filter E27 of the second imaging lens, and imaging surface S215 of the second imaging lens.
The first lens E21 of the second imaging lens has positive focal power, the first lens object-side surface S21 of the first lens of the second imaging lens is convex, and the first lens image-side surface S22 of the first lens of the second imaging lens is concave; the second lens E22 of the second imaging lens has negative focal power, the second lens object-side surface S23 of the second lens of the second imaging lens is convex, and the second lens image-side surface S24 of the second lens of the second imaging lens is concave; the third lens E23 of the second imaging lens has positive refractive power, the third lens object-side surface S25 of the third lens of the second imaging lens is convex, and the third lens image-side surface S26 of the third lens of the second imaging lens is concave; the fourth lens E24 of the second imaging lens has negative focal power, the fourth lens object-side surface S27 of the fourth lens of the second imaging lens is concave, and the fourth lens image-side surface S28 of the fourth lens of the second imaging lens is convex; the fifth lens element E25 of the second imaging lens has positive refractive power, the fifth lens object-side surface S29 of the fifth lens element of the second imaging lens is convex, and the fifth lens image-side surface S210 of the fifth lens element of the second imaging lens is convex; the sixth lens element E26 of the second imaging lens has negative refractive power, and the sixth lens object-side surface S211 and the sixth lens image-side surface S212 of the sixth lens element of the second imaging lens are concave and convex, respectively. The filter E27 of the second imaging lens has a filter object-side surface S213 of the second imaging lens and a filter image-side surface S214 of the second imaging lens. The light from the object passes through the surfaces in sequence and is finally imaged on the imaging plane S215 of the second imaging lens. Table ten shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the second imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters.
TABLE Ten: detailed optical data of the second imaging lens in the present embodiment
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Material of | Coefficient of cone |
| OBJ | Spherical surface | All-round | 1000.0000 | |||
| STO2 | Spherical surface | All-round | -0.1973 | |||
| S21 | Aspherical surface | 1.4868 | 0.4648 | 1.55,56.1 | Plastic cement | -1.0909 |
| S22 | Aspherical surface | 5.9829 | 0.1029 | -73.4794 | ||
| S23 | Aspherical surface | 3.0757 | 0.2185 | 1.66,21.5 | Plastic cement | 0.0000 |
| S24 | Aspherical surface | 1.7002 | 0.1543 | -0.3666 | ||
| S25 | Aspherical surface | 3.0822 | 0.3141 | 1.55,56.1 | Plastic cement | -7.9316 |
| S26 | Aspherical surface | 41.2161 | 0.3668 | -99.9900 | ||
| S27 | Aspherical surface | -4.5335 | 0.2824 | 1.66,21.5 | Plastic cement | -99.9900 |
| S28 | Aspherical surface | -31.9368 | 0.2886 | 0.0000 | ||
| S29 | Aspherical surface | 2.6381 | 0.4172 | 1.55,56.1 | Plastic cement | -0.0181 |
| S210 | Aspherical surface | -2.2768 | 0.2748 | -20.9515 | ||
| S211 | Aspherical surface | -3.5799 | 0.2694 | 1.54,55.7 | Plastic cement | -5.6518 |
| S212 | Aspherical surface | 1.5115 | 0.4725 | -13.0858 | ||
| S213 | Spherical surface | All-round | 0.1995 | 1.52,64.2 | Glass | |
| S214 | Spherical surface | All-round | 0.2375 | |||
| S215 | Spherical surface | All-round |
Table eleven shows the high-order term coefficients of the respective aspherical surfaces of the respective aspherical surface lenses usable for the second imaging lens in this embodiment.
Table eleven: in the present embodiment, the higher-order coefficient of each aspherical surface of the second imaging lens
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 |
| S21 | 2.7720E-02 | 3.7457E-02 | -8.1150E-02 | 6.7547E-02 | 5.8721E-02 | -9.3900E-02 |
| S22 | -8.0540E-02 | 3.3312E-01 | -5.0322E-01 | 4.8797E-01 | -3.1062E-01 | 0.0000E+00 |
| S23 | -3.3067E-01 | 8.6489E-01 | -1.2527E+00 | 1.1610E+00 | -6.6182E-01 | 0.0000E+00 |
| S24 | -3.4912E-01 | 8.3518E-01 | -1.4680E+00 | 1.7863E+00 | -1.0559E+00 | 0.0000E+00 |
| S25 | -8.6970E-02 | 6.5614E-02 | 2.5149E-01 | -1.4813E+00 | 2.9719E+00 | -1.7162E+00 |
| S26 | -1.8250E-02 | -8.6060E-02 | 3.8853E-01 | -9.1571E-01 | 8.6067E-01 | 0.0000E+00 |
| S27 | -3.8621E-01 | 3.7411E-01 | -2.4549E-01 | -3.3328E-02 | 4.6168E-02 | 0.0000E+00 |
| S28 | -3.1029E-01 | 1.7829E-01 | 1.3384E-02 | -1.0567E-01 | 8.1164E-02 | -2.1063E-02 |
| S29 | -1.5940E-02 | 4.7359E-02 | 5.9400E-04 | -1.2359E-02 | 3.4350E-03 | 0.0000E+00 |
| S210 | 2.0223E-01 | -5.3640E-02 | 6.5200E-03 | 4.5276E-04 | 6.5000E-04 | -1.6550E-04 |
| S211 | 4.3749E-02 | 1.0070E-03 | -1.5900E-03 | -1.4130E-04 | 3.4600E-05 | -5.4696E-07 |
| S212 | 5.1409E-02 | -3.9000E-03 | 1.6300E-04 | -3.8730E-05 | 6.7900E-06 | 5.4017E-07 |
Table twelve shows the effective focal length F of the second imaging lens in this embodiment2Effective focal length f of each lens of the second imaging lens21To f26A distance TTL on an optical axis from a first lens object side surface S21 of the second imaging lens to an imaging surface S215 of the second imaging lens2And ImgH which is half the diagonal length of the effective pixel area on the imaging surface of the second imaging lens2F number Fno of the second imaging lens2Object distance P of the second imaging lens2And a maximum half-market field angle Semi-FOV2 of the second imaging lens.
Table twelve: parameters of the second imaging lens
| Example parameters | 4 |
| f21(mm) | 3.50 |
| f22(mm) | -6.18 |
| f23(mm) | 6.08 |
| f24(mm) | -8.08 |
| f25(mm) | 2.31 |
| f26(mm) | -1.94 |
| F2(mm) | 3.48 |
| TTL2(mm) | 4.06 |
| ImgH2(mm) | 2.99 |
| Fno2 | 1.98 |
| P2(mm) | 1000.00 |
| Semi-FOV2(°) | 40.4 |
In the embodiment, the length of the second imaging lens 20 from the first lens object side surface S21 of the first lens of the second imaging lens to the imaging surface S215 of the second imaging lens on the optical axis is 4.06mm, the effective focal length of the second imaging lens is 3.48mm, the image height of the second imaging lens is 2.99mm, the maximum half field angle of the second imaging lens is 40.4 degrees, the aperture value of the second imaging lens is 1.98, and the object distance of the second imaging lens is 1000 mm. This example has guaranteed great light ring when guaranteeing the miniaturization of optical imaging lens, can acquire more light inlet volume, reduces optical aberration when light is not enough, promotes the image acquisition quality, acquires stable formation of image effect. Note that the larger the aperture value, the smaller the aperture, and the smaller the aperture value, the larger the aperture.
In the present embodiment, it is preferred that,
P21000mm, the object distance of second imaging lens is between 500mm to 1500mm, can increase and decrease the weight of first imaging lens 10 and third imaging lens according to the depth of field that second imaging lens 20 measured in real time, effectively improves the imaging efficiency and the frame number of imaging lens group, increases the definition of formation of image.
F2/(f21+f25+f26)＝0.90，F2/(f21+f25+f26) In the range of 0.7 to 1.0, the excessive concentration of focal power can be avoided, the aberration correction capability of the imaging system of the second imaging lens can be well improved, the size of the second imaging lens is effectively reduced, and the lightness and thinness are realized.
(R23+R24)/(R21+R22)＝0.64，(R23+R24)/(R21+R22) Between 0.4 and 0.8, so that the second imaging lens 20 can well realize the deflection of the optical path, and the high-level spherical aberration generated by the second imaging lens 20 is balanced.
TTL2/ImgH2＝1.36，TTL2/ImgH2Between 0 and 1.65, under the condition of a short length, the optical system of the second imaging lens can ensure that the optical system of the second imaging lens has a large enough image surface to present more detailed information of the shot object, so that the imaging is clearer.
Fig. 17 shows an on-axis chromatic aberration curve on the second imaging lens 20 in the present embodiment, which indicates that the converging focal points of the light rays with different wavelengths after passing through the optical system are deviated, so that the image focal planes of the light rays with different wavelengths at the time of final imaging cannot coincide, and the polychromatic light is dispersed to form chromatic dispersion. Fig. 18 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the second imaging lens in the present embodiment. Fig. 19 shows distortion curves of the second imaging lens in the present embodiment, which represent distortion magnitude values in the case of different angles of view. Fig. 20 shows a magnification chromatic aberration curve of the second imaging lens in the present embodiment, which represents a phase difference of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 17 to 20, the second imaging lens 20 in the present embodiment is suitable for portable electronic products, and has a large aperture and good imaging quality.
EXAMPLE five
In this embodiment, the second imaging lens 20 is defined.
As shown in fig. 21, the second imaging lens 20 includes, in order from the object side to the image side along the optical axis: stop STO2 of the second imaging lens, first lens E21 of the second imaging lens, second lens E22 of the second imaging lens, third lens E23 of the second imaging lens, fourth lens E24 of the second imaging lens, fifth lens E25 of the second imaging lens, sixth lens E26 of the second imaging lens, filter E27 of the second imaging lens, and imaging surface S215 of the second imaging lens.
The first lens E21 of the second imaging lens has positive focal power, the first lens object-side surface S21 of the first lens of the second imaging lens is convex, and the first lens image-side surface S22 of the first lens of the second imaging lens is concave; the second lens E22 of the second imaging lens has negative focal power, the second lens object-side surface S23 of the second lens of the second imaging lens is convex, and the second lens image-side surface S24 of the second lens of the second imaging lens is concave; the third lens E23 of the second imaging lens has positive refractive power, the third lens object-side surface S25 of the third lens of the second imaging lens is convex, and the third lens image-side surface S26 of the third lens of the second imaging lens is convex; the fourth lens E24 of the second imaging lens has negative refractive power, the fourth lens object-side surface S27 of the fourth lens of the second imaging lens is a concave surface, and the fourth lens image-side surface S28 of the fourth lens of the second imaging lens is a concave surface; the fifth lens element E25 of the second imaging lens has positive refractive power, the fifth lens object-side surface S29 of the fifth lens element of the second imaging lens is convex, and the fifth lens image-side surface S210 of the fifth lens element of the second imaging lens is convex; the sixth lens element E26 of the second imaging lens has negative refractive power, and the sixth lens object-side surface S211 and the sixth lens image-side surface S212 of the sixth lens element of the second imaging lens are convex and concave, respectively. The filter E27 of the second imaging lens has a filter object-side surface S213 of the second imaging lens and a filter image-side surface S214 of the second imaging lens. The light from the object passes through the surfaces in sequence and is finally imaged on the imaging plane S215 of the second imaging lens. Table thirteen shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the second imaging lens in the present embodiment, where the unit of the radius of curvature and the thickness are both millimeters.
Table thirteen: detailed optical data of the second imaging lens in the present embodiment
Table fourteen shows the high-order term coefficients of each aspherical surface lens that can be used for the second imaging lens in this embodiment.
Table fourteen: in the present embodiment, the higher-order coefficient of each aspherical surface of the second imaging lens
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S21 | 3.1727E-02 | 8.8552E-03 | 6.7254E-02 | -1.6713E-01 | 2.2517E-01 | -1.1671E-01 | -7.4738E-11 |
| S22 | -4.9990E-02 | 1.9041E-01 | -3.4751E-01 | 3.8439E-01 | -2.1418E-01 | -1.9140E-02 | 1.0449E-10 |
| S23 | -2.5696E-01 | 5.1748E-01 | -7.3433E-01 | 5.6756E-01 | -2.9813E-01 | -2.6000E-10 | -2.1722E-10 |
| S24 | -2.6881E-01 | 6.0610E-01 | -9.5714E-01 | 9.2736E-01 | -4.7306E-01 | -7.4000E-04 | 1.9573E-10 |
| S25 | -5.5410E-02 | 5.0061E-02 | 2.5449E-01 | -1.0621E+00 | 1.6476E+00 | -8.0732E-01 | 5.4969E-09 |
| S26 | -3.7030E-02 | -7.2696E-02 | 4.3756E-01 | -8.5473E-01 | 6.2211E-01 | 1.5818E-02 | -1.6873E-07 |
| S27 | -3.4944E-01 | 2.8991E-01 | -1.8466E-01 | -7.4000E-03 | 2.8766E-02 | 0.0000E+00 | 0.0000E+00 |
| S28 | -4.1531E-01 | 2.4570E-01 | 1.9230E-02 | -2.0042E-01 | 1.7641E-01 | -4.7140E-02 | 0.0000E+00 |
| S29 | -2.1800E-03 | 6.9711E-02 | 1.6168E-03 | -2.1462E-02 | 6.3190E-03 | 0.0000E+00 | 0.0000E+00 |
| S210 | 2.9004E-01 | -7.4639E-02 | 7.2129E-03 | -4.9543E-04 | 1.4580E-03 | -3.2000E-04 | 0.0000E+00 |
| S211 | 4.3932E-02 | 4.7924E-03 | -2.7379E-03 | -2.8588E-04 | 7.2300E-05 | -3.3000E-06 | 0.0000E+00 |
| S212 | 8.0624E-02 | -8.2978E-03 | 3.6876E-04 | 7.3650E-05 | 7.5900E-07 | -1.8000E-06 | 0.0000E+00 |
Table fifteen shows the effective focal length F of the second imaging lens in this embodiment2Effective focal length f of each lens of the second imaging lens21To f26A distance TTL on an optical axis from a first lens object side surface S21 of the second imaging lens to an imaging surface S215 of the second imaging lens2And ImgH which is half the diagonal length of the effective pixel area on the imaging surface of the second imaging lens2F number Fno of the second imaging lens2Object distance P of the second imaging lens2And a maximum half-market field angle Semi-FOV2 of the second imaging lens.
Table fifteen: parameters of the second imaging lens
In the embodiment, the length of the second imaging lens 20 from the first lens object side surface S21 of the first lens of the second imaging lens to the imaging surface S215 of the second imaging lens on the optical axis is 4.03mm, the effective focal length of the second imaging lens is 3.06mm, the image height of the second imaging lens is 2.79mm, the maximum half field angle of the second imaging lens is 42.8 degrees, the aperture value of the second imaging lens is 2.40, and the object distance of the second imaging lens is 800 mm.
In the present embodiment, it is preferred that,
P2800mm, the object distance of second imaging lens is between 500mm to 1500mm, can increase and decrease the weight of first imaging lens 10 and third imaging lens according to the depth of field that second imaging lens 20 measured in real time, effectively improves the imaging efficiency and the frame number of imaging lens group, increases the definition of formation of image.
F2/(f21+f25+f26)＝0.80，F2/(f21+f25+f26) In the range of 0.7 to 1.0, the excessive concentration of focal power can be avoided, the aberration correction capability of the imaging system of the second imaging lens can be well improved, the size of the second imaging lens is effectively reduced, and the lightness and thinness are realized.
(R23+R24)/(R21+R22)＝0.74，(R23+R24)/(R21+R22) Between 0.4 and 0.8, so that the second imaging lens 20 can well realize the deflection of the optical path, and the high-level spherical aberration generated by the second imaging lens 20 is balanced.
TTL2/ImgH2＝1.44，TTL2/ImgH2Between 0 and 1.65, under the condition of a short length, the optical system of the second imaging lens can ensure that the optical system of the second imaging lens has a large enough image surface to present more detailed information of the shot object, so that the imaging is clearer.
Fig. 22 shows an on-axis chromatic aberration curve on the second imaging lens 20 in the present embodiment, which indicates that the converging focal points of the light rays with different wavelengths after passing through the optical system are deviated, so that the image focal planes of the light rays with different wavelengths at the time of final imaging cannot coincide, and the polychromatic light is dispersed to form chromatic dispersion. Fig. 23 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the second imaging lens in the present embodiment. Fig. 24 shows distortion curves of the second imaging lens in the present embodiment, which represent distortion magnitude values in the case of different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the second imaging lens in the present embodiment, which represents a phase difference of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 22 to 25, the second imaging lens 20 in the present embodiment is suitable for portable electronic products, and has a large aperture and good imaging quality.
EXAMPLE six
In this embodiment, the second imaging lens 20 is defined.
As shown in fig. 26, the second imaging lens 20 includes, in order from the object side to the image side along the optical axis: stop STO2 of the second imaging lens, first lens E21 of the second imaging lens, second lens E22 of the second imaging lens, third lens E23 of the second imaging lens, fourth lens E24 of the second imaging lens, fifth lens E25 of the second imaging lens, sixth lens E26 of the second imaging lens, filter E27 of the second imaging lens, and imaging surface S215 of the second imaging lens.
The first lens E21 of the second imaging lens has positive focal power, the first lens object-side surface S21 of the first lens of the second imaging lens is convex, and the first lens image-side surface S22 of the first lens of the second imaging lens is concave; the second lens E22 of the second imaging lens has negative focal power, the second lens object-side surface S23 of the second lens of the second imaging lens is convex, and the second lens image-side surface S24 of the second lens of the second imaging lens is concave; the third lens E23 of the second imaging lens has positive refractive power, the third lens object-side surface S25 of the third lens of the second imaging lens is convex, and the third lens image-side surface S26 of the third lens of the second imaging lens is convex; the fourth lens E24 of the second imaging lens has negative refractive power, the fourth lens object-side surface S27 of the fourth lens of the second imaging lens is a concave surface, and the fourth lens image-side surface S28 of the fourth lens of the second imaging lens is a concave surface; the fifth lens element E25 of the second imaging lens has positive refractive power, the fifth lens object-side surface S29 of the fifth lens element of the second imaging lens is convex, and the fifth lens image-side surface S210 of the fifth lens element of the second imaging lens is convex; the sixth lens element E26 of the second imaging lens has negative refractive power, and the sixth lens object-side surface S211 and the sixth lens image-side surface S212 of the sixth lens element of the second imaging lens are convex and concave, respectively. The filter E27 of the second imaging lens has a filter object-side surface S213 of the second imaging lens and a filter image-side surface S214 of the second imaging lens. The light from the object passes through the surfaces in sequence and is finally imaged on the imaging plane S215 of the second imaging lens. Table sixteen shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the second imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters.
Table sixteen: detailed optical data of the second imaging lens in the present embodiment
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Material of | Coefficient of cone |
| OBJ | Spherical surface | All-round | 1200.0000 | |||
| STO | Spherical surface | All-round | -0.2371 | |||
| S21 | Aspherical surface | 1.7665 | 0.5599 | 1.55,56.1 | Plastic cement | -0.5492 |
| S22 | Aspherical surface | 11.9794 | 0.1785 | -14.8529 | ||
| S23 | Aspherical surface | 4.6655 | 0.1914 | 1.66,21.5 | Plastic cement | -23.3705 |
| S24 | Aspherical surface | 2.1898 | 0.2987 | -1.2145 | ||
| S25 | Aspherical surface | 6.4502 | 0.4047 | 1.55,56.1 | Plastic cement | -49.3887 |
| S26 | Aspherical surface | -20.2646 | 0.4347 | -200.0000 | ||
| S27 | Aspherical surface | -24.5203 | 0.2640 | 1.66,21.5 | Plastic cement | 100.0000 |
| S28 | Aspherical surface | 7.8647 | 0.2664 | -156.3322 | ||
| S29 | Aspherical surface | 3.2874 | 0.6470 | 1.55,56.1 | Plastic cement | -1.8728 |
| S210 | Aspherical surface | -2.3135 | 0.3426 | -12.0310 | ||
| S211 | Aspherical surface | 59.8925 | 0.3594 | 1.54,55.7 | Plastic cement | -200.0000 |
| S212 | Aspherical surface | 1.1881 | 0.4645 | -6.2968 | ||
| S213 | Spherical surface | All-round | 0.2398 | 1.52,64.2 | Glass | |
| S214 | Spherical surface | All-round | 0.1723 | |||
| S215 | Spherical surface | All-round |
Table seventeen shows the high-order term coefficients of the respective aspherical surfaces of the respective aspherical surface lenses that can be used for the second imaging lens in this embodiment.
Table seventeen: in the present embodiment, the higher-order coefficient of each aspherical surface of the second imaging lens
Table eighteen shows the effective focal length F of the second imaging lens in this embodiment2Effective focal length f of each lens of the second imaging lens21To f26A distance TTL on an optical axis from a first lens object side surface S21 of the second imaging lens to an imaging surface S215 of the second imaging lens2And ImgH which is half the diagonal length of the effective pixel area on the imaging surface of the second imaging lens2F number Fno of the second imaging lens2Object distance P of the second imaging lens2And a maximum half-market field angle Semi-FOV2 of the second imaging lens.
Table eighteen: parameters of the second imaging lens
| Example parameters | 6 |
| f21(mm) | 3.72 |
| f22(mm) | -6.49 |
| f23(mm) | 9.01 |
| f24(mm) | -9.04 |
| f25(mm) | 2.59 |
| f26(mm) | -2.26 |
| F2(mm) | 3.86 |
| TTL2(mm) | 4.82 |
| ImgH2(mm) | 2.98 |
| Fno2 | 2.00 |
| P2(mm) | 1200.00 |
| Semi-FOV2(°) | 37.9 |
In the embodiment, the length of the second imaging lens 20 from the first lens object side surface S21 of the first lens of the second imaging lens to the imaging surface S215 of the second imaging lens on the optical axis is 4.82mm, the effective focal length of the second imaging lens is 3.86mm, the image height of the second imaging lens is 2.98mm, the maximum half field angle of the second imaging lens is 37.9 degrees, the aperture value of the second imaging lens is 2.00, and the object distance of the second imaging lens is 1200 mm. In the present embodiment, it is preferred that,
P21200mm, the object distance of the second imaging lens is 500mm to 1500mm, and the weights of the first imaging lens 10 and the third imaging lens can be increased or decreased in real time according to the depth of field measured by the second imaging lens 20, so that the imaging efficiency and the frame number of the imaging lens group are effectively improved, and the imaging definition is increased.
F2/(f21+f25+f26)＝0.95，F2/(f21+f25+f26) In the range of 0.7 to 1.0, the excessive concentration of focal power can be avoided, the aberration correction capability of the imaging system of the second imaging lens can be well improved, the size of the second imaging lens is effectively reduced, and the lightness and thinness are realized.
(R23+R24)/(R21+R22)＝0.50，(R23+R24)/(R21+R22) Between 0.4 and 0.8, so that the second imaging lens 20 can well realize the deflection of the optical path, and the high-level spherical aberration generated by the second imaging lens 20 is balanced.
TTL2/ImgH2＝1.62，TTL2/ImgH2Between 0 and 1.65, under the condition that the optical system of the second imaging lens has a shorter length, the optical system of the second imaging lens can be ensured to have a large enough image surface to present more detailed information of the shot object, so that the imaging is clearer.
Fig. 27 shows an on-axis chromatic aberration curve on the second imaging lens 20 in the present embodiment, which indicates that the converging focal points of the light rays with different wavelengths after passing through the optical system are deviated, so that the image focal planes of the light rays with different wavelengths at the time of final imaging cannot coincide, and the polychromatic light spreads to form chromatic dispersion. Fig. 28 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the second imaging lens in the present embodiment. Fig. 29 shows distortion curves of the second imaging lens in the present embodiment, which represent distortion magnitude values in the case of different angles of view. Fig. 30 shows a magnification chromatic aberration curve of the second imaging lens in the present embodiment, which represents a phase difference of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 27 to 30, the second imaging lens 20 in the present embodiment is suitable for portable electronic products, and has a large aperture and good imaging quality.
EXAMPLE seven
In the present embodiment, the third imaging lens 30 is defined.
As shown in fig. 31, the third imaging lens 30 includes, in order from the object side to the image side along the optical axis: the first lens E31 of the third imaging lens, the second lens E32 of the third imaging lens, the stop STO3 of the third imaging lens, the third lens E33 of the third imaging lens, the fourth lens E34 of the third imaging lens, the fifth lens E35 of the third imaging lens, the sixth lens E36 of the third imaging lens, the filter E37 of the third imaging lens, and the imaging surface S315 of the third imaging lens.
The first lens E31 of the third imaging lens has negative focal power, the first lens object-side surface S31 of the first lens of the third imaging lens is a concave surface, and the first lens image-side surface S32 of the first lens of the third imaging lens is a concave surface; the second lens E32 of the third imaging lens has positive focal power, the second lens object-side surface S33 of the second lens of the third imaging lens is convex, and the second lens image-side surface S34 of the second lens of the third imaging lens is concave; the third lens E33 of the third imaging lens has positive focal power, the third lens object-side surface S35 of the third lens of the third imaging lens is convex, and the third lens image-side surface S36 of the third lens of the third imaging lens is convex; the fourth lens E34 of the third imaging lens has negative focal power, the fourth lens object-side surface S37 of the fourth lens of the third imaging lens is a concave surface, and the fourth lens image-side surface S38 of the fourth lens of the third imaging lens is a concave surface; the fifth lens element E35 of the third imaging lens has positive focal power, the fifth lens element object-side surface S39 of the fifth lens element of the third imaging lens is convex, and the fifth lens element image-side surface S310 of the fifth lens element of the third imaging lens is convex; the sixth lens element E36 of the third imaging lens has negative refractive power, the sixth lens object-side surface S311 of the sixth lens element of the third imaging lens is convex, and the sixth lens image-side surface S312 of the sixth lens element of the third imaging lens is concave. The filter E37 of the third imaging lens has a filter object-side surface S313 of the third imaging lens and a filter image-side surface S314 of the third imaging lens. The light from the object passes through the surfaces in sequence and is finally imaged on the imaging plane S315 of the third imaging lens. Table nineteenth shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the third imaging lens in the present embodiment, where the unit of the radius of curvature and the thickness are both millimeters.
Table nineteen: detailed optical data of the third imaging lens in the present embodiment
Table twenty shows the high-order term coefficients of the aspherical surfaces of the aspherical surface lenses that can be used for the third imaging lens in this embodiment.
Table twenty: high-order coefficient of each aspherical surface of the third imaging lens in this embodiment
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S31 | 1.0268E-02 | -3.3370E-03 | 7.5700E-04 | -9.7000E-05 | 7.1800E-06 | -2.9000E-07 | 5.0300E-09 |
| S32 | 1.5417E-02 | 4.8610E-04 | -1.8460E-03 | 5.5360E-04 | -7.5097E-05 | 4.4026E-06 | -6.6669E-08 |
| S33 | -1.5780E-03 | 2.6353E-02 | -2.3100E-03 | -2.9100E-03 | 5.7900E-04 | -4.0000E-07 | -1.8000E-07 |
| S34 | 4.0005E-02 | 9.1240E-02 | -7.2030E-02 | 3.7619E-02 | -2.5000E-04 | -2.1000E-04 | -2.1000E-04 |
| S35 | -5.2230E-03 | -2.8798E-02 | 3.6437E-02 | -2.9930E-02 | -1.1704E-01 | 1.2657E-01 | -1.9320E-02 |
| S36 | 4.8039E-02 | -1.4433E-01 | 2.4787E-01 | -3.2044E-01 | 2.0248E-01 | -5.4840E-02 | 1.8910E-03 |
| S37 | -1.9847E-01 | 1.2471E-02 | 1.6256E-01 | -2.2146E-01 | 9.0116E-02 | -1.3510E-02 | -9.5000E-04 |
| S38 | -6.0678E-02 | -3.8962E-02 | 1.0329E-01 | -8.0490E-02 | 3.0583E-02 | -5.5600E-03 | 3.6900E-04 |
| S39 | 8.4766E-02 | -1.3306E-01 | 8.9162E-02 | -3.0070E-02 | 4.0880E-03 | 1.7300E-04 | -7.1000E-05 |
| S310 | 1.4193E-01 | -7.8360E-02 | 5.6467E-02 | -2.9620E-02 | 9.1180E-03 | -1.4800E-03 | 9.9400E-05 |
| S311 | -2.2851E-02 | -3.8838E-02 | 3.1019E-02 | -1.1200E-02 | 1.8730E-03 | -1.2000E-04 | -1.3000E-08 |
| S312 | -5.5388E-02 | 1.2155E-02 | -1.2900E-03 | -1.4000E-06 | 1.0000E-05 | -5.3000E-07 | -1.1000E-11 |
Table twenty-one shows the effective focal length F of the third imaging lens in this embodiment3Effective focal length f of each lens of the third imaging lens31To f36A distance TTL on the optical axis from the object side surface S31 of the first lens of the third imaging lens to the imaging surface S315 of the third imaging lens3And ImgH which is half the diagonal length of the effective pixel region on the imaging surface of the third imaging lens3F number Fno of the third imaging lens3Object distance P of the third imaging lens3And a maximum half-market field angle Semi-FOV3 of the third imaging lens.
Table twenty one: parameters of the third imaging lens
In the embodiment, the length of the third imaging lens 30 from the first lens object side surface S31 of the first lens of the third imaging lens to the imaging surface S315 of the third imaging lens on the optical axis is 8.22mm, the effective focal length of the third imaging lens is 1.75mm, the image height of the third imaging lens is 3.85mm, the maximum half field angle of the third imaging lens is 68.5 degrees, and the aperture value of the third imaging lens is 2.43.
In the present embodiment, it is preferred that,
(f31+f34+f36)/(f32+f33+f35)＝-0.85，(f31+f34+f36)/(f32+f33+f35) In the range of-1.0 to-0.4, the contribution amount of the curvature of field of each lens of the third imaging lens can be reasonably controlled, so that the curvature of field of the third imaging lens is controlled in a reasonable range.
(R39+R310)/(R39+R310)＝0.85，(R39+R310)/(R39+R310) Within the range of 0.6 to 0.9, the deflection angle of the marginal light of the optical imaging system of the third imaging lens can be reasonably controlled, and the sensitivity of the optical imaging system of the third imaging lens can be effectively reduced.
Fig. 32 shows an on-axis chromatic aberration curve on the third imaging lens 30 in the present embodiment, which indicates that the converging focal points of the light rays with different wavelengths after passing through the optical system are deviated, so that the image focal planes of the light rays with different wavelengths cannot coincide at the time of final imaging, and the polychromatic light spreads to form chromatic dispersion. Fig. 33 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the third imaging lens in the present embodiment. Fig. 34 shows distortion curves of the third imaging lens in the present embodiment, which represent distortion magnitude values in the case of different angles of view. Fig. 35 shows a chromatic aberration of magnification curve of the third imaging lens in the present embodiment, which represents a phase difference of different image heights on the imaging surface after light passes through the optical imaging lens. As can be seen from fig. 32 to 35, the third imaging lens 30 in the present embodiment is suitable for portable electronic products, and has a large aperture and good imaging quality.
Example eight
In the present embodiment, the third imaging lens 30 is defined.
As shown in fig. 36, the third imaging lens 30 includes, in order from the object side to the image side along the optical axis: the first lens E31 of the third imaging lens, the second lens E32 of the third imaging lens, the stop STO3 of the third imaging lens, the third lens E33 of the third imaging lens, the fourth lens E34 of the third imaging lens, the fifth lens E35 of the third imaging lens, the sixth lens E36 of the third imaging lens, the filter E37 of the third imaging lens, and the imaging surface S315 of the third imaging lens.
The first lens E31 of the third imaging lens has negative focal power, the first lens object-side surface S31 of the first lens of the third imaging lens is a convex surface, and the first lens image-side surface S32 of the first lens of the third imaging lens is a concave surface; the second lens E32 of the third imaging lens has positive focal power, the second lens object-side surface S33 of the second lens of the third imaging lens is convex, and the second lens image-side surface S34 of the second lens of the third imaging lens is concave; the third lens E33 of the third imaging lens has positive focal power, the third lens object-side surface S35 of the third lens of the third imaging lens is convex, and the third lens image-side surface S36 of the third lens of the third imaging lens is convex; the fourth lens E34 of the third imaging lens has negative focal power, the fourth lens object-side surface S37 of the fourth lens of the third imaging lens is convex, and the fourth lens image-side surface S38 of the fourth lens of the third imaging lens is concave; the fifth lens element E35 of the third imaging lens has positive focal power, the fifth lens element object-side surface S39 of the fifth lens element of the third imaging lens is convex, and the fifth lens element image-side surface S310 of the fifth lens element of the third imaging lens is convex; the sixth lens element E36 of the third imaging lens has negative refractive power, the sixth lens object-side surface S311 of the sixth lens element of the third imaging lens is concave, and the sixth lens image-side surface S312 of the sixth lens element of the third imaging lens is convex. The filter E37 of the third imaging lens has a filter object-side surface S313 of the third imaging lens and a filter image-side surface S314 of the third imaging lens. The light from the object passes through the surfaces in sequence and is finally imaged on the imaging plane S315 of the third imaging lens. Table twenty two shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the third imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters.
TABLE twenty-two: detailed optical data of the third imaging lens in the present embodiment
| Flour mark | Surface type | Radius of curvature | Thickness of | Material | Material of | Coefficient of cone |
| OBJ | Spherical surface | All-round | All-round | |||
| S1 | Aspherical surface | 6.9406 | 0.1803 | 1.55,56.1 | Plastic cement | -2.8367 |
| S2 | Aspherical surface | 1.7487 | 1.3641 | -1.3493 | ||
| S3 | Aspherical surface | 2.2805 | 0.3669 | 1.65,23.5 | Plastic cement | -0.8386 |
| S4 | Aspherical surface | 3.2170 | 0.9491 | -4.5177 | ||
| STO | Spherical surface | All-round | 0.0270 | 0.0000 | ||
| S5 | Aspherical surface | -900.0000 | 0.9543 | 1.55,56.1 | Plastic cement | -5817.5982 |
| S6 | Aspherical surface | -1.4423 | 0.2271 | -0.0914 | ||
| S7 | Aspherical surface | 7.5233 | 0.2009 | 1.65,23.5 | Plastic cement | -17.5686 |
| S8 | Aspherical surface | 2.1161 | 0.1825 | -10.3337 | ||
| S9 | Aspherical surface | 13.3381 | 1.7224 | 1.55,56.1 | Plastic cement | -955.4503 |
| S10 | Aspherical surface | -1.4259 | 0.4246 | -0.6669 | ||
| S11 | Aspherical surface | 11.4238 | 0.5754 | 1.65,23.5 | Plastic cement | 17.7527 |
| S12 | Aspherical surface | 1.5136 | 0.8534 | -4.7866 | ||
| S13 | Spherical surface | All-round | 0.2700 | 1.52,64.2 | Glass | |
| S14 | Spherical surface | All-round | 0.2698 | |||
| S15 | Spherical surface | All-round |
Table twenty three shows the high-order term coefficients of the respective aspherical surfaces of the respective aspherical surface lenses usable for the third imaging lens in this embodiment.
Table twenty three: high-order coefficient of each aspherical surface of the third imaging lens in this embodiment
Table twenty-four shows the effective focal length F of the third imaging lens in this embodiment3Each of the third imaging lensesEffective focal length f of the lens31To f36A distance TTL on the optical axis from the object side surface S31 of the first lens of the third imaging lens to the imaging surface S315 of the third imaging lens3And ImgH which is half the diagonal length of the effective pixel region on the imaging surface of the third imaging lens3F number Fno of the third imaging lens3Object distance P of the third imaging lens3And a maximum half-market field angle Semi-FOV3 of the third imaging lens.
Table twenty-four: parameters of the third imaging lens
| Example parameters | 8 |
| f31(mm) | -4.34 |
| f32(mm) | 10.54 |
| f33(mm) | 2.65 |
| f34(mm) | -4.64 |
| f35(mm) | 2.46 |
| f36(mm) | -2.77 |
| F3(mm) | 2.41 |
| TTL3(mm) | 8.57 |
| ImgH3(mm) | 3.68 |
| Fno3 | 2.90 |
| P3(mm) | All-round |
| Semi-FOV3(°) | 68.5 |
In the embodiment, the length of the third imaging lens 30 from the first lens object side surface S31 of the first lens of the third imaging lens to the imaging surface S315 of the third imaging lens on the optical axis is 8.57mm, the effective focal length of the third imaging lens is 2.41mm, the image height of the third imaging lens is 3.68mm, the maximum half field angle of the third imaging lens is 68.5 degrees, and the aperture value of the third imaging lens is 2.90. In the present embodiment, it is preferred that,
(f31+f34+f36)/(f32+f33+f35)＝-0.75，(f31+f34+f36)/(f32+f33+f35) In the range of-1.0 to-0.4, the contribution amount of the curvature of field of each lens of the third imaging lens can be reasonably controlled, so that the curvature of field of the third imaging lens is controlled in a reasonable range.
(R39+R310)/(R39+R310)＝0.81，(R39+R310)/(R39+R310) Within the range of 0.6 to 0.9, the deflection angle of the marginal light of the optical imaging system of the third imaging lens can be reasonably controlled, and the sensitivity of the optical imaging system of the third imaging lens can be effectively reduced.
Fig. 37 shows an on-axis chromatic aberration curve on the third imaging lens 30 in the present embodiment, which indicates that the converging focal points of the light rays with different wavelengths after passing through the optical system are deviated, so that the image focal planes of the light rays with different wavelengths at the time of final imaging cannot coincide, and the polychromatic light is dispersed to form chromatic dispersion. Fig. 38 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the third imaging lens in the present embodiment. Fig. 39 shows distortion curves of the third imaging lens in the present embodiment, which represent distortion magnitude values in the case of different angles of view. Fig. 40 shows a chromatic aberration of magnification curve of the third imaging lens in the present embodiment, which represents a phase difference of different image heights on the imaging surface after light passes through the optical imaging lens. As can be seen from fig. 37 to 40, the third imaging lens 30 in the present embodiment is suitable for portable electronic products, and has a large aperture and good imaging quality.
Example nine
In the present embodiment, the third imaging lens 30 is defined.
As shown in fig. 41, the third imaging lens 30 includes, in order from the object side to the image side along the optical axis: the first lens E31 of the third imaging lens, the second lens E32 of the third imaging lens, the stop STO3 of the third imaging lens, the third lens E33 of the third imaging lens, the fourth lens E34 of the third imaging lens, the fifth lens E35 of the third imaging lens, the sixth lens E36 of the third imaging lens, the filter E37 of the third imaging lens, and the imaging surface S315 of the third imaging lens.
The first lens E31 of the third imaging lens has negative focal power, the first lens object-side surface S31 of the first lens of the third imaging lens is a convex surface, and the first lens image-side surface S32 of the first lens of the third imaging lens is a concave surface; the second lens E32 of the third imaging lens has positive focal power, the second lens object-side surface S33 of the second lens of the third imaging lens is convex, and the second lens image-side surface S34 of the second lens of the third imaging lens is concave; the third lens E33 of the third imaging lens has positive focal power, the third lens object-side surface S35 of the third lens of the third imaging lens is a concave surface, and the third lens image-side surface S36 of the third lens of the third imaging lens is a convex surface; the fourth lens E34 of the third imaging lens has negative focal power, the fourth lens object-side surface S37 of the fourth lens of the third imaging lens is convex, and the fourth lens image-side surface S38 of the fourth lens of the third imaging lens is concave; the fifth lens element E35 of the third imaging lens has positive focal power, the fifth lens element object-side surface S39 of the fifth lens element of the third imaging lens is convex, and the fifth lens element image-side surface S310 of the fifth lens element of the third imaging lens is convex; the sixth lens element E36 of the third imaging lens has negative refractive power, the sixth lens object-side surface S311 of the sixth lens element of the third imaging lens is convex, and the sixth lens image-side surface S312 of the sixth lens element of the third imaging lens is concave. The filter E37 of the third imaging lens has a filter object-side surface S313 of the third imaging lens and a filter image-side surface S314 of the third imaging lens. The light from the object passes through the surfaces in sequence and is finally imaged on the imaging plane S315 of the third imaging lens. Table twenty-five shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the third imaging lens in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters.
Table twenty-five: detailed optical data of the third imaging lens in the present embodiment
Table twenty-six shows the high-order term coefficients of the respective aspherical surfaces of the respective aspherical surface lenses usable for the third imaging lens in this implementation.
Table twenty-six: high-order coefficient of each aspherical surface of the third imaging lens in this embodiment
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S31 | 1.1395E-02 | -4.3918E-03 | 1.1065E-03 | -1.5704E-04 | 1.3000E-05 | -6.0000E-07 | 1.3000E-08 |
| S32 | 3.3346E-02 | 3.4040E-03 | -3.8398E-03 | 1.4951E-03 | -2.6000E-04 | 1.7300E-05 | -6.1000E-07 |
| S33 | 2.1464E-02 | 2.2895E-02 | -1.0544E-02 | -3.1783E-03 | 1.0490E-03 | -8.1000E-07 | -4.0000E-07 |
| S34 | 7.0574E-02 | 7.8477E-02 | -6.7707E-02 | 3.0233E-02 | -4.5000E-04 | -4.3000E-04 | -4.7000E-04 |
| S35 | -8.4260E-03 | -5.2840E-02 | 7.9719E-02 | -5.1933E-02 | -2.1214E-01 | 2.5561E-01 | -4.3480E-02 |
| S36 | 4.2439E-02 | -1.4971E-01 | 3.6693E-01 | -5.2983E-01 | 3.6701E-01 | -1.1076E-01 | 4.2550E-03 |
| S37 | -1.9448E-01 | -8.6994E-03 | 2.4960E-01 | -3.3841E-01 | 1.6334E-01 | -2.7280E-02 | -2.1400E-03 |
| S38 | -7.7204E-02 | -5.4622E-02 | 1.5115E-01 | -1.2996E-01 | 5.5433E-02 | -1.1220E-02 | 8.3000E-04 |
| S39 | 9.0500E-02 | -1.7185E-01 | 1.3063E-01 | -4.8674E-02 | 7.4090E-03 | 3.5000E-04 | -1.6000E-04 |
| S310 | 1.3137E-01 | -1.0106E-01 | 8.1529E-02 | -4.8159E-02 | 1.6527E-02 | -3.0000E-03 | 2.2400E-04 |
| S311 | -2.9447E-02 | -4.4443E-02 | 4.0996E-02 | -1.7595E-02 | 3.3950E-03 | -2.5000E-04 | -2.9000E-08 |
| S312 | -4.9899E-02 | 1.3239E-02 | -1.7593E-03 | -2.2131E-06 | 1.8200E-05 | -1.1000E-06 | -2.4000E-11 |
Table twenty-seventh shows the effective focal length F of the third imaging lens in this embodiment3Effective focal length f of each lens of the third imaging lens31To f36A distance TTL on the optical axis from the object side surface S31 of the first lens of the third imaging lens to the imaging surface S315 of the third imaging lens3And ImgH which is half the diagonal length of the effective pixel region on the imaging surface of the third imaging lens3F number Fno of the third imaging lens3Object distance P of the third imaging lens3And a maximum half-market field angle Semi-FOV3 of the third imaging lens.
Table twenty-seven: parameters of the third imaging lens
| EXAMPLES referenceNumber of | 9 |
| f31(mm) | -3.62 |
| f32(mm) | 16.25 |
| f33(mm) | 2.13 |
| f34(mm) | -4.52 |
| f35(mm) | 2.37 |
| f36(mm) | -2.27 |
| F3(mm) | 2.29 |
| TTL3(mm) | 8.57 |
| ImgH3(mm) | 3.63 |
| Fno3 | 2.76 |
| P3(mm) | All-round |
| Semi-FOV3(°) | 68.5 |
In the embodiment, the length of the third imaging lens 30 from the first lens object side surface S31 of the first lens of the third imaging lens to the imaging surface S315 of the third imaging lens on the optical axis is 8.57mm, the effective focal length of the third imaging lens is 2.29mm, the image height of the third imaging lens is 3.63mm, the maximum half field angle of the third imaging lens is 68.5 degrees, and the aperture value of the third imaging lens is 2.76. In the present embodiment, it is preferred that,
(f31+f34+f36)/(f32+f33+f35)＝-0.50，(f31+f34+f36)/(f32+f33+f35) In the range of-1.0 to-0.4, the contribution amount of the curvature of field of each lens of the third imaging lens can be reasonably controlled, so that the curvature of field of the third imaging lens is controlled in a reasonable range.
(R39+R310)/(R39+R310)＝0.70，(R39+R310)/(R39+R310) Within the range of 0.6 to 0.9, the deflection angle of the marginal light of the optical imaging system of the third imaging lens can be reasonably controlled, and the sensitivity of the optical imaging system of the third imaging lens can be effectively reduced.
Fig. 42 shows an on-axis chromatic aberration curve on the third imaging lens 30 in the present embodiment, which indicates that the converging focal points of the light rays with different wavelengths after passing through the optical system are deviated, so that the image focal planes of the light rays with different wavelengths at the time of final imaging cannot coincide, and the polychromatic light is dispersed to form chromatic dispersion. Fig. 43 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the third imaging lens in the present embodiment. Fig. 44 shows distortion curves of the third imaging lens in the present embodiment, which represent distortion magnitude values in the case of different angles of view. Fig. 45 shows a chromatic aberration of magnification curve of the third imaging lens in the present embodiment, which represents a phase difference of different image heights on the imaging surface after light passes through the optical imaging lens. As can be seen from fig. 42 to 45, the third imaging lens 30 in the present embodiment is suitable for portable electronic products, and has a large aperture and good imaging quality.
It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to 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. An imaging lens group, comprising a first imaging lens (10), a second imaging lens (20) and a third imaging lens (30) which are sequentially arranged at intervals, wherein the first imaging lens (10), the second imaging lens (20) and the third imaging lens (30) satisfy:
1.0＜Fno1＜Fno2＜Fno3＜3.0；
5.0mm＞F1＞F2＞F3＞1.0mm；
P1＜P2＜P3；
wherein, Fno1Is the f-number of the first imaging lens, Fno2Is the f-number of the second imaging lens, Fno3Is the F-number of the third imaging lens, F1Is an effective focal length of the first imaging lens, F2Is the effective focal length of the second imaging lens, F3Is an effective focal length, P, of the third imaging lens1Is the object distance, P, of the first imaging lens2Is an object distance, P, of the second imaging lens3Is the object distance of the third imaging lens.
2. The imaging lens group of claim 1,
the first imaging lens (10) comprises at least three lenses with positive focal power;
the second imaging lens (20) comprises at least three lenses having positive optical power;
the third imaging lens (30) includes at least three lenses having positive optical power.
3. The imaging lens group of claim 2,
the first imaging lens (10), the second imaging lens (20) and the third imaging lens (30) are provided with lenses of which at least one lens surface is aspheric; and/or
Angle of view Fov of the third imaging lens3Angle of view Fov greater than the first imaging lens1And a field angle Fov of the third imaging lens3Angle of view Fov greater than the second imaging lens2。
4. The imaging lens group according to any one of claims 1 to3, characterized in that an object distance P of the second imaging lens2Greater than or equal to 500mmAnd less than or equal to 1500 mm.
5. The imaging lens group according to any one of claims 1 to3,
effective focal length F of the second imaging lens2Effective focal length f of the first lens of the second imaging lens21Effective focal length f of fifth lens of the second imaging lens25And an effective focal length f of a sixth lens of the second imaging lens26Satisfy 0.7 < F2/(f21+f25+f26) Less than 1.0; and/or
A radius of curvature R of a second lens object-side surface of a second lens of the second imaging lens23And the curvature radius R of the second lens image side surface of the second lens of the second imaging lens24And the curvature radius R of the object side surface of the first lens of the second imaging lens21And a radius of curvature R of a first lens image-side surface of the first lens of the second imaging lens22Satisfies 0.4 < (R)23+R24)/(R21+R22)＜0.8。
6. The imaging lens group according to any of claims 1 to3, wherein a distance TTL on an optical axis of the second imaging lens between an object side surface of the first lens element of the second imaging lens and an imaging surface of the second imaging lens2And ImgH which is half of the diagonal length of the effective pixel area on the imaging surface of the second imaging lens2Satisfy TTL therebetween2/ImgH2＜1.65。
7. The imaging lens group according to any of claims 1 to3, wherein the effective focal length f of the first lens of the third imaging lens31An effective focal length f of a second lens of the third imaging lens32An effective focal length f of a third lens of the third imaging lens33An effective focal length f of a fourth lens of the third imaging lens34The thirdEffective focal length f of fifth lens of imaging lens35And an effective focal length f of a sixth lens of the third imaging lens36Satisfy-1.0 < (f)31+f34+f36)/(f32+f33+f35)＜-0.4。
8. The imaging lens group according to any of claims 1 to3, wherein a radius of curvature R of an object side surface of the fifth lens of the third imaging lens39And the curvature radius R of the image side surface of the fifth lens of the third imaging lens310Satisfies 0.6 < (R)39+R310)/(R39+R310)＜0.9。
9. The imaging lens group according to any one of claims 1 to3, wherein an optical axis of the first imaging lens, an optical axis of the second imaging lens and an optical axis of the third imaging lens are all not coaxial.
10. An imaging apparatus, characterized by comprising the imaging lens group according to any one of claims 1 to 9.
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| CN201921481910.0U CN210639336U (en) | 2019-09-06 | 2019-09-06 | Imaging lens group and imaging device |
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| CN110426828A (en) * | 2019-09-06 | 2019-11-08 | 浙江舜宇光学有限公司 | Imaging lens group and imaging device |
| CN110426828B (en) * | 2019-09-06 | 2024-04-23 | 浙江舜宇光学有限公司 | Imaging lens group and imaging device |
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