CN219695550U - Optical imaging lens - Google Patents
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- CN219695550U CN219695550U CN202320603086.1U CN202320603086U CN219695550U CN 219695550 U CN219695550 U CN 219695550U CN 202320603086 U CN202320603086 U CN 202320603086U CN 219695550 U CN219695550 U CN 219695550U
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 127
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Abstract
The application discloses an optical imaging lens, which comprises a lens barrel, a lens group and a plurality of spacing elements, wherein the lens group and the spacing elements are accommodated in the lens barrel; the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the third lens and the fourth lens have positive and negative opposite focal powers, and the thickness of the sixth lens along the direction parallel to the optical axis is increased and then reduced from a paraxial region to a paraxial region; the plurality of spacing elements includes a second spacing element located on and in contact with the image side of the second lens and a fourth spacing element located on and in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens, the effective focal length f3 of the third lens, the outer diameter D4s of the object side surface of the fourth spacing element, and the inner diameter D2m of the image side surface of the second spacing element satisfy: 0< |f4/f3|× ((D4 s-D2 m)/D2 m) <9.0.
Description
Technical Field
The present application relates to the field of optical elements, and more particularly, to an optical imaging lens.
Background
Along with the continuous improvement of the requirements of people on mobile phone shooting, at the same time, the industry also puts forward higher and higher requirements on optical imaging lenses. In the process of improving the required performance, the stability requirement on lens production is also ensured.
Taking a six-piece lens with wider application as an example, the problem of assembly performance stability of the lens is increasingly remarkable at present, wherein the problem of structural assembly performance and optical stability of the second lens, the third lens and the fourth lens of the lens are particularly remarkable, and a series of problems that the assembly requirements cannot be realized, the light inlet quantity of a system is influenced, the adjustment of coma of the system is influenced and the like due to poor matching or design of optical parameters or structural dimensions of part of components often exist, so that the lens cannot achieve the expected imaging effect. In addition, the problems that the optical element cannot accurately pass through the matching space in the lens barrel, light is blocked in the assembly process and the like can also occur in the assembly process, so that the assembly yield is not facilitated, and the improvement of the imaging quality of the lens is not facilitated.
Therefore, in view of the current situation, how to effectively improve or overcome the above-mentioned problems by optimally designing the optical parameters and the structural parameters of the lens, the spacer element, and the lens barrel, so as to achieve the effective improvement of the stability of the assembly performance of the lens, is one of the technical problems that needs to be solved by those skilled in the art.
Disclosure of Invention
An optical imaging lens may include a barrel, a lens group accommodated in the barrel, and a plurality of spacer elements. The outer ring surface of the lens barrel comprises at least one conical ring surface; the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the third lens and the fourth lens have positive and negative opposite optical power, and the thickness of the sixth lens along a direction parallel to the optical axis is increased from a paraxial region to a paraxial region and then reduced; the plurality of spacer elements may include a second spacer element located on the image side of the second lens and in contact with the image side of the second lens, and a fourth spacer element located on the image side of the fourth lens and in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens, the effective focal length f3 of the third lens, the outer diameter D4s of the object-side surface of the fourth spacing element, and the inner diameter D2m of the image-side surface of the second spacing element may satisfy: 0< |f4/f3|× ((D4 s-D2 m)/D2 m) <9.0.
In one embodiment, the effective focal length f5 of the fifth lens, the outer diameter D4m of the image side surface of the fourth spacing element, and the inner diameter D4s of the object side surface of the fourth spacing element may satisfy: 2.0< f 5/(D4 m-D4 s) <10.
In one embodiment, the plurality of spacer elements may further include a sixth spacer element located at and in contact with the image side of the sixth lens; the effective focal length f6 of the sixth lens, the inner diameter d0m of the image side end surface of the lens barrel, and the minimum inner diameter d6 of the sixth spacing element may satisfy: -5.0< f 6/(d 0m-d 6) < -2.0.
In one embodiment, the plurality of spacer elements may further include a first spacer element located at and in contact with an image side of the first lens; the aperture factor Fno of the optical imaging lens, the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element along the optical axis, and the inner diameter d1s of the object side surface of the first spacer element may satisfy: fno/(EP 01/d1 s) < 8.0.0.
In one embodiment, the effective focal length f1 of the first lens, the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacing element along the optical axis, and the air interval T12 between the first lens and the second lens on the optical axis may satisfy: 4.0< f 1/(EP 01-T12) <7.5.
In one embodiment, the radius of curvature R4 of the image side of the second lens element, the radius of curvature R8 of the image side of the fourth lens element, and the distance EP24 between the image side of the second spacer element and the object side of the fourth spacer element along the optical axis may satisfy: 15< (R4-R8)/EP 24 is less than or equal to 55.
In one embodiment, the effective focal length f2 of the second lens, the distance EP12 from the image side of the first spacer element to the object side of the second spacer element along the optical axis, and the air separation T23 of the second lens and the third lens on the optical axis may satisfy: -60< f 2/(EP 12-T23) < -30.
In one embodiment, the radius of curvature R2 of the image side of the first lens, the radius of curvature R4 of the image side of the second lens, the air space T12 of the first lens and the second lens on the optical axis, and the distance EP12 from the image side of the first spacer element to the object side of the second spacer element along the optical axis may satisfy: 20< (R2+R4)/(T12+EP 12) <30.
In one embodiment, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R1 of the object side surface of the first lens, the outer diameter D1m of the image side surface of the first spacing element and the inner diameter D1s of the object side surface of the first spacing element may satisfy: 1.5< (R2-R1)/(D1 m-D1 s) <5.0.
In one embodiment, among the first to fifth lenses, an i-th lens has negative optical power, an i-th spacer element is a spacer element located at an image side of the i-th lens and in contact with the image side of the i-th lens, and an effective focal length fi of the i-th lens and an outer diameter Dis of an object side of the i-th spacer element may satisfy: -35< fi/Dis < -1.0, wherein i is taken from 1, 2, 3, 4, 5.
In one embodiment, half of the maximum field angle Semi-FOV of the optical imaging lens, the outer diameter D4s of the object side surface of the fourth interval element, the outer diameter D0s of the object side end surface of the lens barrel, and the outer diameter D0m of the image side end surface of the lens barrel may satisfy: 0.9< tan (Semi-FOV)/((D4 s-D0 s)/(D0 m-D4 s)) <4.5.
In one embodiment, the effective focal length f1 of the first lens, the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element along the optical axis may satisfy: 3.5< f1/EP01<6.0.
In one embodiment, three lenses of the first to sixth lenses have positive optical power, and the remaining three lenses have negative optical power.
In one embodiment, the radii of curvature of the object-side surface and the image-side surface of the first lens element, the fourth lens element and the fifth lens element are respectively two numerical values with positive and negative identical signs.
The application provides an optical imaging lens which comprises a six-piece imaging lens group, a plurality of interval elements and a lens barrel, wherein the first lens to the sixth lens are sequentially arranged from an object side to an image side along an optical axis, wherein the third lens and the fourth lens have positive and negative opposite focal powers, and the thickness of the sixth lens along the direction parallel to the optical axis is increased from a paraxial region to a paraxial region and then reduced; the outer ring surface of the lens barrel comprises at least one conical ring surface; and the image side of the second lens is provided with a second spacing element contacting the image side surface thereof, the image side of the fourth lens is provided with a fourth spacing element contacting the image side surface thereof, and the effective focal length f4 of the fourth lens, the effective focal length f3 of the third lens, the outer diameter D4s of the object side surface of the fourth spacing element and the inner diameter D2m of the image side surface of the second spacing element satisfy the condition 0< |f4/f3|× ((D4 s-D2 m)/D2 m) <9.0. By the arrangement of the optical imaging lens, the application can ensure that the system has fully sufficient light entering quantity after the light passes through the second lens and the third lens; in addition, the lens meets the imaging effect, and simultaneously ensures that each element can precisely pass through the matching space among the optical lens barrels in the assembling process, so that the assembling performance of the third lens, the fourth lens and the fourth interval element is stable; and the lens can have enough space to carry out system coma adjustment, and the second interval element, the third lens, the fourth lens and the like can be prevented from blocking light rays in the assembly process, so that the imaging quality and the yield of the lens are improved.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic view showing the structure and partial parameters of an optical imaging lens according to an exemplary embodiment of the present application;
fig. 2 is a schematic diagram showing the structure of a lens group included in an optical imaging lens according to embodiment 1 of the present application;
fig. 3 to 5 show schematic structural views of an optical imaging lens according to embodiment 1 of the present application in three embodiments, respectively;
fig. 6 to 9 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 1;
fig. 10 is a schematic diagram showing the structure of a lens group included in an optical imaging lens according to embodiment 2 of the present application;
fig. 11 to 13 are schematic views showing the structure of an optical imaging lens according to embodiment 2 of the present application in three embodiments, respectively;
fig. 14 to 17 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 2;
fig. 18 is a schematic diagram showing the structure of a lens group included in an optical imaging lens according to embodiment 3 of the present application;
Fig. 19 to 21 are schematic views showing the structure of an optical imaging lens according to embodiment 3 of the present application in three embodiments, respectively;
fig. 22 to 25 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 3;
fig. 26 is a schematic diagram showing the structure of a lens group included in an optical imaging lens according to embodiment 4 of the present application;
fig. 27 to 29 are schematic views showing the structure of an optical imaging lens according to embodiment 4 of the present application in three embodiments, respectively; and
fig. 30 to 33 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 4.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be performed according to a method commonly used in the art, for example, by determining the roughness in positive and negative of an R value (R means the radius of curvature of the paraxial region). The surface of each lens closest to the subject is referred to herein as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens. In 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 image side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The following examples merely illustrate a few embodiments of the present application, which are described in greater detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
An optical imaging lens according to an exemplary embodiment of the present application may include a barrel and a lens group and a plurality of spacer elements fitted within the barrel. The lens group may be a six-piece lens group including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side to an image side along the optical axis. The plurality of spacer elements may include a second spacer element located on the image side of the second lens and in contact with the image side of the second lens, and a fourth spacer element located on the image side of the fourth lens and in contact with the image side of the fourth lens.
In an exemplary embodiment, the third lens and the fourth lens may have opposite powers.
In an exemplary embodiment, the thickness of the sixth lens in the direction parallel to the optical axis gradually increases and then gradually decreases from a paraxial region to a paraxial region, wherein the paraxial region refers to a position or region closer to the optical axis and the paraxial region refers to a position or region farther from the optical axis, that is, from a position closer to the optical axis to a position farther from the optical axis, and the thickness of the sixth lens in the direction parallel to the optical axis tends to change from increasing to decreasing.
In an exemplary embodiment, the outer annular surface of the barrel comprises at least one conical annular surface. The lens barrel may have an object side end face, an image side end face, an inner annulus, and an outer annulus, wherein the outer annulus of the lens barrel may have one or more conical annuluses, for example, in its constituent parts.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0< |f4/f3|× ((D4 s-D2 m)/D2 m) <9.0, where f4 is an effective focal length of the fourth lens, f3 is an effective focal length of the third lens, D4s is an outer diameter of an object side surface of the fourth spacer element, and D2m is an inner diameter of an image side surface of the second spacer element.
The application provides an optical imaging lens, which comprises a lens barrel, a lens group and a plurality of interval elements, wherein the lens group is assembled in the lens barrel, the lens group comprises a first lens, a second lens and a third lens, the first lens and the sixth lens are sequentially arranged from an object side to an image side along an optical axis, the third lens and the fourth lens have positive and negative opposite focal powers, and the thickness of the sixth lens along a direction parallel to the optical axis is increased from a paraxial position to a far axial position and then reduced; the outer ring surface of the lens barrel comprises at least one conical ring surface; and the image side of the second lens is provided with a second spacing element contacted with the image side surface of the second lens, the image side of the fourth lens is provided with a fourth spacing element contacted with the image side surface of the fourth lens, and the effective focal length f4 of the fourth lens, the effective focal length f3 of the third lens and the outer diameter D4s of the object side surface of the fourth spacing element and the inner diameter D2m of the image side surface of the second spacing element meet the condition 0< |f4/f3|× ((D4 s-D2 m)/D2 m) <9.0. The optical imaging lens provided by the application can ensure that the system has completely sufficient light entering quantity after light passes through the second lens and the third lens; in addition, the lens meets the imaging effect, and simultaneously ensures that each element can precisely pass through the matching space among the optical lens barrels in the assembling process, so that the assembling performance of the third lens, the fourth lens and the fourth interval element is stable; and the lens can have enough space to carry out system coma adjustment, and the second interval element, the third lens, the fourth lens and the like can be prevented from blocking light rays in the assembly process, so that the imaging quality and the yield of the lens are improved.
In an exemplary embodiment, the plurality of spacer elements may further include: a first spacer element located on and in contact with the image side of the first lens; a third spacer element located on and in contact with the image side of the third lens; a fifth spacer element located on and in contact with the image side of the fifth lens; and a sixth spacing element located on and in contact with the image side of the sixth lens.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 2.0< f 5/(D4 m-D4 s) <10, where f5 is an effective focal length of the fifth lens, D4m is an outer diameter of an image side surface of the fourth interval element, and D4s is an inner diameter of an object side surface of the fourth interval element. The ratio of the effective focal length of the fifth lens to the difference between the outer diameter of the image side surface of the fourth interval element and the inner diameter of the object side surface of the fourth interval element is controlled within the range, so that the light intensity of an off-axis vision field can be controlled, the rationality of the structure is ensured, the space of a lens in a lens barrel is reduced, the lens is favorable for adapting to different lenses, and meanwhile, the positive axis aberration part can be matched and corrected, and the imaging quality of the whole system is improved.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression-5.0 < f 6/(d 0m-d 6) < -2.0, where f6 is an effective focal length of the sixth lens, d0m is an inner diameter of an image side end surface of the lens barrel, and d6 is a minimum inner diameter of the sixth interval element. By controlling the ratio of the effective focal length of the sixth lens to the difference between the inner diameter of the image side end surface of the lens barrel and the minimum inner diameter of the sixth spacing element in the range, the center-axis distance between the sixth lens and each lens of the front end surface can be reduced in the assembling process, the center optical axis of each lens is effectively ensured, and the imaging quality of the system is improved.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 5.0+.fno/(EP 01/d1 s) <8.0, where Fno is an aperture coefficient of the optical imaging lens, EP01 is a distance from an object side end surface of the lens barrel to an object side surface of the first spacer element along the optical axis, and d1s is an inner diameter of the object side surface of the first spacer element. By controlling the aperture coefficient of the optical imaging lens, the distance from the object side end surface of the lens barrel to the object side surface of the first interval element along the optical axis and the inner diameter of the object side surface of the first interval element to satisfy the condition that the Fno/(EP 01/d1 s) <8.0, the relation between the angle of view and the clear aperture size of the lens barrel can be reasonably ensured, the matching degree of the lens and the chip can be improved, the sensitivity of the rear end lens of the imaging system can be reduced, and the production can be more effectively and stably carried out.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression of 4.0< f 1/(EP 01-T12) <7.5, where f1 is the effective focal length of the first lens, EP01 is the distance along the optical axis from the object-side end surface of the lens barrel to the object-side surface of the first spacing element, and T12 is the air spacing of the first lens and the second lens on the optical axis. The imaging system can meet the requirement of optical performance by controlling the ratio of the effective focal length of the first lens to the distance from the object side end surface of the lens barrel to the object side surface of the first spacing element along the optical axis and the difference between the air intervals of the first lens and the second lens on the optical axis in the range, the imaging quality is ensured, and stray light formed by reflection of redundant light in the effective diameter is avoided.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 15< (R4-R8)/EP 24.ltoreq.55, where R4 is a radius of curvature of an image side of the second lens, R8 is a radius of curvature of an image side of the fourth lens, and EP24 is a distance along the optical axis from the image side of the second spacer element to an object side of the fourth spacer element. By controlling the ratio of the difference between the curvature radius of the image side surface of the second lens and the curvature radius of the image side surface of the fourth lens to the distance from the image side surface of the second spacing element to the object side surface of the fourth spacing element along the optical axis within the range, the deflection angle of the external view field surface can be reasonably controlled, the fault tolerance interval of the system can be effectively improved within a certain range, and the sensitivity of the system is reduced.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the condition-60 < f 2/(EP 12-T23) < -30, where f2 is the effective focal length of the second lens, EP12 is the distance from the image side surface of the first spacer element to the object side surface of the second spacer element along the optical axis, and T23 is the air separation of the second lens and the third lens on the optical axis. By controlling the ratio of the effective focal length of the second lens to the distance from the image side surface of the first spacing element to the object side surface of the second spacing element along the optical axis and the difference between the air intervals of the second lens and the third lens on the optical axis within the range, the aberration of the front optical lens can be controlled within the focal length meeting the requirements of each lens, so that the system aberration meets the design requirements, and the edge thickness of the second lens and the third lens can be controlled, so that the second lens and the third lens can show good state in the stability of structure and assembly.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 20< (r2+r4)/(t12+ep12) <30, where R2 is a radius of curvature of an image side of the first lens, R4 is a radius of curvature of an image side of the second lens, T12 is an air gap between the first lens and the second lens on an optical axis, and EP12 is a distance from the image side of the first spacing element to an object side of the second spacing element along the optical axis. The ratio of the sum of the curvature radius of the image side surface of the first lens to the curvature radius of the image side surface of the second lens and the sum of the air interval between the first lens and the second lens on the optical axis and the distance between the image side surface of the first interval element and the object side surface of the second interval element along the optical axis is controlled in the range, so that the diameter of the entrance pupil is controlled, the structural space of the lens can be effectively reduced under the condition that the required depth of field and illumination are met, more space is provided for correcting positive off-axis aberration, and the imaging quality of the system is improved.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression of 1.5< (R2-R1)/(D1 m-D1 s) <5.0, where R2 is a radius of curvature of an image side surface of the first lens, R1 is a radius of curvature of an object side surface of the first lens, D1m is an outer diameter of an image side surface of the first spacer element, and D1s is an inner diameter of the object side surface of the first spacer element. The ratio of the difference between the curvature radius of the image side surface of the first lens and the curvature radius of the object side surface of the first lens to the difference between the outer diameter of the image side surface of the first spacing element and the inner diameter of the object side surface of the first spacing element is controlled within the range, so that the imaging quality of light passing through the first lens and the second lens can be controlled, the light angle of the field of view can be in a reasonable range, and the sensitivity of the field of view can be reduced.
In an exemplary embodiment, an i-th lens of the first to fifth lenses has negative optical power, and an image side of the i-th lens is provided with an i-th spacing element in contact with an image side thereof. The optical imaging lens can meet the condition-35 fi/Dis < -1.0, wherein fi is the effective focal length of the ith lens, dis is the outer diameter of the object side surface of the ith spacing element, and i is taken from 1, 2, 3, 4 and 5. By controlling the ratio of the effective focal length of the ith lens to the outer diameter of the object side surface of the ith spacing element in the range, the light flux required by the lens can be ensured to meet the requirement, the light convergence can be ensured to meet the requirement, and the adjustment of the structure is facilitated to reduce the lens processing and assembling difficulty.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 0.9< tan (Semi-FOV)/((D4 s-D0 s)/(D0 m-D4 s)) <4.5, where Semi-FOV is half of the maximum field angle of the optical imaging lens, D4s is the outer diameter of the object side surface of the fourth interval element, D0s is the outer diameter of the object side end surface of the lens barrel, and D0m is the outer diameter of the image side end surface of the lens barrel. By controlling the half of the maximum angle of view of the optical imaging lens, the outer diameter of the object side surface of the fourth spacer element, the outer diameter of the object side end surface of the lens barrel, and the outer diameter of the image side end surface of the lens barrel to satisfy the condition 0.9< tan (Semi-FOV)/((D4 s-D0 s)/(D0 m-D4 s)) <4.5, the outer diameter of the fourth spacer element and the angle of view of the imaging lens can be effectively controlled, the size of the imaging lens can be effectively reduced, the optical performance of the lens can be ensured, and the fitting processing injection molding can be easier, which is advantageous for stable assembly.
In an exemplary embodiment, the optical imaging lens of the present application may satisfy the conditional expression 3.5< f1/EP01<6.0, where f1 is an effective focal length of the first lens, and EP01 is a distance from an object-side end surface of the lens barrel to an object-side surface of the first spacer element along the optical axis. By controlling the ratio of the effective focal length of the first lens to the distance from the object side end surface of the lens barrel to the object side surface of the first spacing element along the optical axis within the range, enough apertures can be ensured to obtain required depth of field and illumination, the compactness of the lens structure is facilitated, meanwhile, the off-axis aberration is corrected, and the overall image quality of the system is improved.
In an exemplary embodiment, among six lenses of the first to sixth lenses, three lenses may be lenses having positive optical power, and the remaining three lenses may be lenses having negative optical power.
In an exemplary embodiment, the three lenses of the first lens element, the fourth lens element and the fifth lens element may have two values having the same sign, respectively, of the radius of curvature of the object side surface and the radius of curvature of the image side surface.
In an exemplary embodiment, the optical imaging lens of the present application may include at least one diaphragm. The diaphragm can restrict the light path and control the intensity of light. A diaphragm may be provided at an appropriate position of the optical imaging lens, for example, the diaphragm may be provided between the object side and the first lens.
In an exemplary embodiment, the optical imaging lens may further include an optical filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging surface.
The optical imaging lens according to the above-described embodiment of the present application may include a six-piece imaging lens group, a plurality of spacer elements, and a lens barrel, wherein the third lens and the fourth lens have positive and negative opposite optical powers, and a thickness of the sixth lens in a direction parallel to the optical axis increases and decreases from a paraxial region to a paraxial region; the outer ring surface of the lens barrel comprises at least one conical ring surface; and the image side of the second lens is provided with a second spacing element contacting the image side surface thereof, the image side of the fourth lens is provided with a fourth spacing element contacting the image side surface thereof, and the effective focal length f4 of the fourth lens, the effective focal length f3 of the third lens, the outer diameter D4s of the object side surface of the fourth spacing element and the inner diameter D2m of the image side surface of the second spacing element satisfy the condition 0< |f4/f3|× ((D4 s-D2 m)/D2 m) <9.0. The system can ensure that the system has fully sufficient light entering quantity after the light passes through the second lens and the third lens; in addition, the lens meets the imaging effect, and simultaneously ensures that each element can precisely pass through the matching space among the optical lens barrels in the assembling process, so that the assembling performance of the third lens, the fourth lens and the fourth interval element is stable; and the lens can have enough space to carry out system coma adjustment, and the second interval element, the third lens, the fourth lens and the like can be prevented from blocking light rays in the assembly process, so that the imaging quality and the yield of the lens are improved.
In an embodiment of the present application, one or more of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens may have one or more aspherical surfaces, and the aspherical lens has a better radius of curvature characteristic and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality.
However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging lens may be varied, as may the number of spacer elements, to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although six lenses are described as an example in the embodiment, the optical imaging lens is not limited to include six lenses. The optical imaging lens may also include other numbers of lenses, if desired. As another example, although the first to sixth spacing elements are described as an example in the embodiment, the optical imaging lens is not limited to include the first to sixth spacing elements. The optical imaging lens may also include other numbers of spacer elements, if desired.
Specific examples of the optical imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging lens according to embodiment 1 of the present application is described below with reference to fig. 2 to 9. Fig. 2 shows a schematic structural view of a lens group included in the optical imaging lens according to embodiment 1 of the present application, and fig. 3, 4, and 5 show schematic structural views of the optical imaging lens according to embodiment 1 of the present application in three different embodiments, respectively.
Referring to fig. 2 to 5, the optical imaging lens includes a lens barrel P0 and an optical lens assembly mounted in the lens barrel P0, which are sequentially arranged from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave.
In this embodiment, the optical imaging lens further includes a filter E7 located at the image side of the sixth lens E6, the filter E7 having an object side surface S13 and an image side surface S14. And, the optical imaging lens further includes an imaging surface S15, and light from the object may sequentially pass through the respective surfaces S1 to S14 and finally be imaged on the imaging surface S15, for example.
Table 1 shows basic parameters of the optical imaging lens of embodiment 1, in which the unit of curvature radius and thickness/distance is millimeter (mm).
TABLE 1
In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following tables 2-1 and 2-2 give the higher order coefficients A that can be used for each of the aspherical mirror faces S1 to S12 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
| Face number | A4 | A6 | A8 | A10 | A12 |
| S1 | 1.5007E-03 | 1.3884E-02 | -1.2794E-01 | 5.9915E-01 | -1.6371E+00 |
| S2 | -4.1546E-02 | 8.4231E-02 | -6.4838E-01 | 3.0355E+00 | -8.7291E+00 |
| S3 | -3.9923E-03 | 6.4190E-02 | 4.5743E-01 | -2.9355E+00 | 9.9742E+00 |
| S4 | -2.1013E-02 | 4.8316E-01 | -2.6605E+00 | 1.3907E+01 | -4.8106E+01 |
| S5 | -1.7821E-01 | 3.0020E-01 | -1.3462E+00 | 4.1648E+00 | -9.8850E+00 |
| S6 | -1.7974E-01 | 3.9437E-01 | -2.0880E+00 | 8.2117E+00 | -2.2657E+01 |
| S7 | -1.8954E-01 | 8.4694E-02 | 6.4581E-01 | -3.3352E+00 | 8.9834E+00 |
| S8 | -1.7666E-01 | 1.1677E-01 | 6.4821E-02 | -3.2024E-01 | 5.7847E-01 |
| S9 | -9.4319E-02 | -3.2186E-02 | 1.3627E-02 | 1.2095E-02 | -2.6658E-02 |
| S10 | -1.3508E-02 | -5.2810E-02 | 3.4111E-02 | -1.4113E-02 | 3.4383E-03 |
| S11 | -6.1051E-02 | 4.0456E-02 | -1.6401E-02 | 4.1212E-03 | -6.4709E-04 |
| S12 | -5.0821E-02 | 1.7595E-02 | -2.6890E-03 | -1.0080E-04 | 1.0441E-04 |
TABLE 2-1
| Face number | A14 | A16 | A18 | A20 |
| S1 | 2.6508E+00 | -2.5496E+00 | 1.3380E+00 | -3.0030E-01 |
| S2 | 1.5272E+01 | -1.5814E+01 | 8.8406E+00 | -2.0473E+00 |
| S3 | -2.0498E+01 | 2.5504E+01 | -1.7619E+01 | 5.1725E+00 |
| S4 | 1.0726E+02 | -1.4721E+02 | 1.1341E+02 | -3.7381E+01 |
| S5 | 1.7612E+01 | -2.2710E+01 | 1.8656E+01 | -6.9671E+00 |
| S6 | 4.0665E+01 | -4.5161E+01 | 2.8132E+01 | -7.5155E+00 |
| S7 | -1.4745E+01 | 1.4601E+01 | -8.0682E+00 | 1.9049E+00 |
| S8 | -5.4891E-01 | 2.7540E-01 | -6.8582E-02 | 6.4985E-03 |
| S9 | 2.1057E-02 | -7.9156E-03 | 1.4342E-03 | -1.0158E-04 |
| S10 | -3.5974E-04 | -1.0611E-05 | 4.7468E-06 | -2.2231E-07 |
| S11 | 6.4311E-05 | -3.9605E-06 | 1.3842E-07 | -2.0992E-09 |
| S12 | -1.8814E-05 | 1.7961E-06 | -9.2350E-08 | 1.9863E-09 |
TABLE 2-2
Fig. 3, 4 and 5 show schematic structural views of an optical imaging lens in three different implementations of embodiments 1-1, 1-2 and 1-3, respectively, and as can be seen in conjunction with fig. 3 to 5, the optical imaging lens may further include a plurality of spacer elements accommodated in the lens barrel P0.
Specifically, in embodiments 1-1, 1-2, and 1-3, the plurality of spacer elements includes: a first spacer element P1 located between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1; a second spacer element P2 located between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2; a third spacer element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fifth spacer element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5; and a sixth spacer element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.
The relevant parameter values in examples 1-1, 1-2 and 1-3 are shown in table 9, respectively, in combination with fig. 3 to 5 and fig. 1, wherein d1s is the inner diameter of the object side surface of the first spacer element P1; d1m is the outer diameter of the image side surface of the first spacer element P1; d2m is the inner diameter of the image side surface of the second spacer element P2; d2s is the outer diameter of the object side surface of the second spacer element P2; d3s is the outer diameter of the object side surface of the third spacer element P3; d4s is the inner diameter of the object side surface of the fourth spacer element P4; d4s is the outer diameter of the object side surface of the fourth spacer element P4; d4m is the outer diameter of the image side surface of the fourth spacer element P4; d6 is the minimum inner diameter of the sixth spacer element P6; d0m is the inner diameter of the image side end face of the lens barrel P0; d0s is the outer diameter of the object side end surface of the lens barrel P0; d0m is the outer diameter of the image side end face of the lens barrel P0; EP01 is a distance between the object side end surface of the lens barrel P0 and the object side surface of the first spacer element P1 along the optical axis; EP12 is the distance along the optical axis from the image side of the first spacer element P1 to the object side of the second spacer element P2; and EP24 is the distance along the optical axis from the image side of the second spacer element P2 to the object side of the fourth spacer element P4; the unit of each of the above parameters shown in Table 9 is millimeter (mm).
Fig. 6 shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which indicates the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 7 shows an astigmatism curve of the optical imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8 shows distortion curves of the optical imaging lens of embodiment 1, which represent distortion magnitude values corresponding to different image heights. Fig. 9 shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6 to 9, the optical imaging lens provided in embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging lens according to embodiment 2 of the present application is described below with reference to fig. 10 to 17. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 10 is a schematic view showing the structure of a lens group included in an optical imaging lens according to embodiment 2 of the present application, and fig. 11, 12, and 13 are schematic views showing the structure of an optical imaging lens according to embodiment 2 of the present application in three different embodiments, respectively.
Referring to fig. 10 to 13, the optical imaging lens includes a barrel P0 and an optical lens assembly mounted in the barrel P0 and sequentially arranged from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex.
In this embodiment, the optical imaging lens further includes a filter E7 located at the image side of the sixth lens E6, the filter E7 having an object side surface S13 and an image side surface S14. And, the optical imaging lens further includes an imaging surface S15, and light from the object may sequentially pass through the respective surfaces S1 to S14 and finally be imaged on the imaging surface S15, for example.
Table 3 shows basic parameters of the optical imaging lens of embodiment 2, in which the unit of curvature radius and thickness/distance is millimeter (mm). Tables 4-1 and 4-2 show the higher order coefficients A that can be used for each of the aspherical mirror surfaces S1 to S12 in example 2 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 3 Table 3
TABLE 4-1
| Face number | A14 | A16 | A18 | A20 |
| S1 | -2.3915E-02 | -1.1694E-02 | 1.9537E-02 | -8.6654E-03 |
| S2 | -1.5684E-01 | 6.7376E-01 | -6.8793E-01 | 2.3407E-01 |
| S3 | -7.7100E+00 | 8.1138E+00 | -4.8352E+00 | 1.2361E+00 |
| S4 | 2.3502E+01 | -2.4724E+01 | 1.3713E+01 | -2.9006E+00 |
| S5 | -6.2991E+01 | 7.7038E+01 | -5.2211E+01 | 1.5117E+01 |
| S6 | 2.9672E+00 | -2.8902E+00 | 1.5249E+00 | -3.3368E-01 |
| S7 | -6.1601E+00 | 4.2799E+00 | -1.6536E+00 | 2.6908E-01 |
| S8 | -4.5717E-01 | 1.8895E-01 | -4.1148E-02 | 3.6698E-03 |
| S9 | -5.1444E-03 | 7.8134E-04 | -5.8372E-05 | 1.5648E-06 |
| S10 | -6.9613E-04 | 4.3293E-05 | 1.7208E-06 | -2.5602E-07 |
| S11 | -1.8202E-05 | 2.0434E-06 | -1.0302E-07 | 2.0266E-09 |
| S12 | 4.0715E-05 | -2.8511E-06 | 1.0907E-07 | -1.7382E-09 |
TABLE 4-2
Fig. 11, 12 and 13 show schematic structural views of an optical imaging lens in three different implementations of examples 2-1, 2-2 and 2-3, respectively, and as can be seen in conjunction with fig. 11 to 13, the optical imaging lens may further include a plurality of spacer elements accommodated in the lens barrel P0.
Specifically, in embodiments 2-1 and 2-2, the plurality of spacer elements includes: a first spacer element P1 located between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1; a second spacer element P2 located between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2; a third spacer element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fifth spacer element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5; and a sixth spacer element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.
In embodiments 2-3, the plurality of spacer elements includes: a first spacer element P1 located between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1; a second spacer element P2 located between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2; a third spacer element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; and a sixth spacer element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.
The values of the relevant parameters in examples 2-1, 2-2 and 2-3 are shown in Table 9, respectively, wherein the meanings of the parameters are as described above, and the description thereof will not be repeated, and the units of the parameters shown in Table 9 are millimeters (mm).
Fig. 14 shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which indicates the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 15 shows an astigmatism curve of the optical imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16 shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 17 shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 14 to 17, the optical imaging lens provided in embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging lens according to embodiment 3 of the present application is described below with reference to fig. 18 to 25. Fig. 18 shows a schematic structural view of a lens group included in an optical imaging lens according to embodiment 3 of the present application, and fig. 19, 20, and 21 show schematic structural views of the optical imaging lens according to embodiment 3 of the present application in three different embodiments, respectively.
Referring to fig. 18 to 21, the optical imaging lens includes a barrel P0 and an optical lens assembly mounted in the barrel P0, sequentially arranged from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave.
In this embodiment, the optical imaging lens further includes a filter E7 located at the image side of the sixth lens E6, the filter E7 having an object side surface S13 and an image side surface S14. And, the optical imaging lens further includes an imaging surface S15, and light from the object may sequentially pass through the respective surfaces S1 to S14 and finally be imaged on the imaging surface S15, for example.
Table 5 shows basic parameters of the optical imaging lens of embodiment 3, in which the unit of curvature radius and thickness/distance is millimeter (mm). Tables 6-1 and 6-2 show the higher order term coefficients A that can be used for each of the aspherical mirror faces S1 to S12 in example 3 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 5
TABLE 6-1
| Face number | A14 | A16 | A18 | A20 |
| S1 | -1.1504E+00 | 1.0837E+00 | -5.4437E-01 | 1.1019E-01 |
| S2 | -6.2484E-01 | 9.7460E-01 | -6.8077E-01 | 1.8175E-01 |
| S3 | -1.4651E+01 | 1.4783E+01 | -8.2569E+00 | 1.9586E+00 |
| S4 | 8.4534E+00 | 2.9015E+00 | -1.1652E+01 | 6.5647E+00 |
| S5 | -5.6783E+01 | 7.4624E+01 | -5.3837E+01 | 1.6510E+01 |
| S6 | 1.8484E+01 | -1.8213E+01 | 9.9556E+00 | -2.3194E+00 |
| S7 | -1.1051E+01 | 8.4417E+00 | -3.3959E+00 | 5.0640E-01 |
| S8 | -5.7636E-01 | 2.6644E-01 | -6.4937E-02 | 6.4940E-03 |
| S9 | 5.7240E-03 | -1.6998E-03 | 2.5984E-04 | -1.5823E-05 |
| S10 | 1.1875E-03 | -3.0728E-04 | 3.9556E-05 | -2.0312E-06 |
| S11 | 7.7991E-05 | -4.9103E-06 | 1.7564E-07 | -2.7331E-09 |
| S12 | -6.3825E-05 | 5.1410E-06 | -2.3408E-07 | 4.6297E-09 |
TABLE 6-2
Fig. 19, 20 and 21 show schematic structural views of an optical imaging lens in three different implementations of embodiments 3-1, 3-2 and 3-3, respectively, and as can be seen in conjunction with fig. 19 to 21, the optical imaging lens may further include a plurality of spacer elements accommodated in the lens barrel P0.
Specifically, in embodiments 3-1, 3-2 and 3-3, the plurality of spacing elements includes: a first spacer element P1 located between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1; a second spacer element P2 located between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2; a third spacer element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fifth spacer element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5; and a sixth spacer element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.
The values of the relevant parameters in examples 3-1, 3-2 and 3-3 are shown in Table 9, respectively, wherein the meanings of the parameters are as described above, and the description thereof will not be repeated, and the units of the parameters shown in Table 9 are millimeters (mm).
Fig. 22 shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which indicates the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 23 shows an astigmatism curve of the optical imaging lens of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 24 shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 25 shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 22 to 25, the optical imaging lens provided in embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 26 to 33. Fig. 26 shows a schematic structural view of a lens group included in an optical imaging lens according to embodiment 4 of the present application, and fig. 27, 28, and 29 show schematic structural views of an optical imaging lens according to embodiment 4 of the present application in three different embodiments, respectively.
Referring to fig. 26 to 29, the optical imaging lens includes a barrel P0 and an optical lens assembly mounted in the barrel P0, sequentially arranged from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex.
In this embodiment, the optical imaging lens further includes an imaging surface S13 located at the image side of the sixth lens E6, and light from the object can sequentially pass through the respective surfaces S1 to S12 and finally be imaged on the imaging surface S13, for example.
Table 7 shows basic parameters of the optical imaging lens of embodiment 4, in which the unit of curvature radius and thickness/distance is millimeter (mm). Tables 8-1 and 8-2 show that can be used in an implementation The higher order coefficients A of the aspherical mirror surfaces S1 to S12 in example 4 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 7
TABLE 8-1
| Face number | A14 | A16 | A18 | A20 |
| S1 | -1.9700E+00 | 5.1315E+00 | -6.3538E+00 | 2.8635E+00 |
| S2 | -7.5346E+01 | 1.0854E+02 | -9.3378E+01 | 3.6040E+01 |
| S3 | -3.9567E+02 | 6.5695E+02 | -6.1091E+02 | 2.4345E+02 |
| S4 | 3.8901E+00 | -8.1165E+01 | 1.4438E+02 | -8.4753E+01 |
| S5 | -1.7330E+02 | 3.1602E+02 | -3.1296E+02 | 1.2797E+02 |
| S6 | 9.9027E+01 | -8.5636E+01 | 2.6859E+01 | 3.5373E+00 |
| S7 | 7.9773E+01 | -5.1095E+01 | -7.7236E+00 | 1.9316E+01 |
| S8 | 5.3350E+00 | -4.5436E+00 | 1.7563E+00 | -3.0914E-02 |
| S9 | 1.3321E+01 | -1.1977E+01 | 5.9897E+00 | -1.2676E+00 |
| S10 | 6.3933E-01 | -3.0028E-01 | 7.6165E-02 | -8.4281E-03 |
| S11 | -1.0156E-02 | 1.8096E-03 | -1.8135E-04 | 7.7414E-06 |
| S12 | -1.1159E-03 | 1.2492E-04 | -7.9541E-06 | 2.2064E-07 |
TABLE 8-2
Fig. 27, 28 and 29 show schematic structural views of an optical imaging lens in three different implementations of examples 4-1, 4-2 and 4-3, respectively, and as can be seen in conjunction with fig. 27 to 29, the optical imaging lens may further include a plurality of spacer elements accommodated in a lens barrel P0.
Specifically, in embodiments 4-1, 4-2, and 4-3, the plurality of spacer elements includes: a first spacer element P1 located between the first lens E1 and the second lens E2 and in contact with the image side surface of the first lens E1; a second spacer element P2 located between the second lens E2 and the third lens E3 and in contact with the image side surface of the second lens E2; a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fifth spacer element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5; and a sixth spacer element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.
The values of the relevant parameters in examples 4-1, 4-2 and 4-3 are shown in Table 9, respectively, wherein the meanings of the parameters are as described above, and the description thereof will not be repeated, and the units of the parameters shown in Table 9 are millimeters (mm).
Fig. 30 shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which indicates the focus deviation of light rays of different wavelengths after passing through the lens. Fig. 31 shows an astigmatism curve of the optical imaging lens of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 32 shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 33 shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 30 to 33, the optical imaging lens provided in embodiment 4 can achieve good imaging quality.
TABLE 9
Further, in embodiments 1 to 4, the effective focal length values f1 to f6 of the respective lenses, the effective focal length f of the optical imaging lens, and the maximum field angle FOV of the optical imaging lens are shown in table 10.
| Parameters/embodiments | 1 | 2 | 3 | 4 |
| f1(mm) | 3.12 | 3.25 | 3.15 | 2.76 |
| f2(mm) | -7.92 | -8.85 | -9.27 | -3.94 |
| f3(mm) | 20555.33 | -86.71 | -75.34 | 4.01 |
| f4(mm) | -95.04 | 31.71 | 237.09 | -9.13 |
| f5(mm) | 13.55 | 27.03 | 22.52 | 6.82 |
| f6(mm) | -3.76 | -3.37 | -4.29 | -3.64 |
| f(mm) | 4.58 | 4.58 | 4.58 | 3.95 |
| FOV(°) | 81.6 | 83.0 | 81.7 | 82.1 |
Table 10
Examples 1 to 4 satisfy the conditions shown in tables 11-1 and 11-2, respectively.
TABLE 11-1
TABLE 11-2
The application also provides an imaging device provided with an electron-sensitive element for imaging, which can be a photosensitive coupling element (Charge Coupled Device, CCD) or a complementary metal-oxide-semiconductor element (Complementary Metal Oxide Semiconductor, CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the optical imaging lens described above.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the application is not limited to the specific combination of the above technical features, but also encompasses other technical features which may be combined with any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (14)
1. An optical imaging lens comprising a lens barrel, a lens group accommodated in the lens barrel and a plurality of spacing elements, characterized in that,
the outer ring surface of the lens barrel comprises at least one conical ring surface;
the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the third lens and the fourth lens have positive and negative opposite optical power, and the thickness of the sixth lens along a direction parallel to the optical axis is increased from a paraxial region to a paraxial region and then reduced;
The plurality of spacing elements comprises: a second spacer element located on and in contact with the image side of the second lens; and a fourth spacing element located on and in contact with an image side of the fourth lens;
the optical imaging lens satisfies the following conditions:
0<|f4/f3|×((D4s-d2m)/d2m)<9.0，
wherein f4 is an effective focal length of the fourth lens element, f3 is an effective focal length of the third lens element, D4s is an outer diameter of an object side surface of the fourth spacer element, and D2m is an inner diameter of an image side surface of the second spacer element.
2. The optical imaging lens of claim 1, wherein an effective focal length f5 of the fifth lens, an outer diameter D4m of an image side surface of the fourth spacer element, and an inner diameter D4s of an object side surface of the fourth spacer element satisfy:
2.0<f5/(D4m-d4s)<10。
3. the optical imaging lens of claim 1, wherein the plurality of spacer elements further comprises: a sixth spacing element located on and in contact with the image side of the sixth lens;
an effective focal length f6 of the sixth lens, an inner diameter d0m of an image side end surface of the lens barrel, and a minimum inner diameter d6 of the sixth spacing element satisfy:
-5.0<f6/(d0m-d6)<-2.0。
4. the optical imaging lens of claim 1, wherein the plurality of spacer elements further comprises: a first spacing element located on and in contact with an image side of the first lens;
The aperture factor Fno of the optical imaging lens, the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacing element along the optical axis, and the inner diameter d1s of the object side surface of the first spacing element satisfy:
5.0≤Fno/(EP01/d1s)<8.0。
5. the optical imaging lens according to claim 4, wherein an effective focal length f1 of the first lens, a distance EP01 from an object side end surface of the lens barrel to an object side surface of the first spacer element along the optical axis, and an air interval T12 of the first lens and the second lens on the optical axis satisfy:
4.0<f1/(EP01-T12)<7.5。
6. the optical imaging lens of claim 1, wherein a radius of curvature R4 of an image side of the second lens, a radius of curvature R8 of an image side of the fourth lens, and a distance EP24 along the optical axis from the image side of the second spacer element to the object side of the fourth spacer element satisfy:
15<(R4-R8)/EP24≤55。
7. the optical imaging lens of claim 4, wherein an effective focal length f2 of the second lens, a distance EP12 from an image side surface of the first spacer element to an object side surface of the second spacer element along the optical axis, and an air space T23 of the second lens and the third lens on the optical axis satisfy:
-60<f2/(EP12-T23)<-30。
8. The optical imaging lens of claim 4, wherein a radius of curvature R2 of an image side of the first lens, a radius of curvature R4 of an image side of the second lens, an air gap T12 of the first lens and the second lens on the optical axis, and a distance EP12 from the image side of the first spacing element to the object side of the second spacing element along the optical axis satisfy:
20<(R2+R4)/(T12+EP12)<30。
9. the optical imaging lens of claim 4, wherein a radius of curvature R2 of an image side of the first lens, a radius of curvature R1 of an object side of the first lens, an outer diameter D1m of an image side of the first spacer element, and an inner diameter D1s of an object side of the first spacer element satisfy:
1.5<(R2-R1)/(D1m-d1s)<5.0。
10. the optical imaging lens as claimed in claim 1, wherein an i-th lens among the first to fifth lenses has negative optical power, the i-th spacer element is a spacer element located on and in contact with an image side of the i-th lens,
the effective focal length fi of the ith lens and the outer diameter Dis of the object side surface of the ith spacing element satisfy:
-35< fi/Dis < -1.0, wherein i is taken from 1, 2, 3, 4, 5.
11. The optical imaging lens according to claim 1, wherein a half of a maximum field angle Semi-FOV of the optical imaging lens, an outer diameter D4s of an object side surface of the fourth interval element, an outer diameter D0s of an object side end surface of the lens barrel, and an outer diameter D0m of an image side end surface of the lens barrel satisfy:
0.9<Tan(Semi-FOV)/((D4s-D0s)/(D0m-D4s))<4.5。
12. the optical imaging lens according to claim 4, wherein an effective focal length f1 of the first lens, a distance EP01 from an object side end surface of the barrel to an object side surface of the first spacer element along the optical axis satisfies:
3.5<f1/EP01<6.0。
13. the optical imaging lens of any of claims 1 to 12, wherein three of the first to sixth lenses have positive optical power and the remaining three lenses have negative optical power.
14. The optical imaging lens system according to any one of claims 1 to 12, wherein the first lens element, the fourth lens element and the fifth lens element each have two values of positive and negative identical signs in terms of the radius of curvature of the object side surface and the radius of curvature of the image side surface.
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