CN219085210U - Image pickup lens - Google Patents

Abstract

The application discloses an imaging lens, which comprises an optical lens group and a plurality of interval elements, wherein the optical lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis, and a seventh lens is used as a sixth lens, wherein the first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has negative focal power, and the object side surface of the second lens is a convex surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; wherein the plurality of spacer elements includes a fifth spacer element located between the fifth lens and the sixth lens and a sixth spacer element located between the sixth lens and the seventh lens, and the total effective focal length f of the optical lens group, the thickness CP5 of the fifth spacer element, the thickness CP6 of the sixth spacer element, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 15< f/(CP5+CP6-CT 6) <70.

Description

Image pickup lens

Technical Field

The present application relates to the field of optical elements, and in particular, to an imaging lens.

Background

With the performance improvement and size reduction of the charge-coupled device (CCD) and the complementary metal oxide semiconductor (complementary metal-oxide semiconductor, CMOS) image sensor, the corresponding imaging lens is required to meet the requirements of high imaging quality and miniaturization.

Imaging lenses generally include a plurality of lenses and a spacer element for coupling adjacent lenses, and for imaging lenses including five or more lenses, a problem of assembly stability due to a large level difference between the lenses occurs. Along with the increase of the image plane, the edge of the lens is easy to generate a stray light phenomenon, and the problems of stray light and assembly stability seriously affect the imaging quality of the imaging lens. Therefore, how to reasonably set the optical parameters of the imaging lens and the structures and dimensions of the lens and the spacer element to improve the stray light and optimize the assembly stability of the lens is a problem to be solved in the art.

It should be appreciated that this background section is intended to provide, in part, a useful background for understanding the technology, however, that such content does not necessarily fall within the knowledge or understanding of one of skill in the art prior to the filing date of this application.

Disclosure of Invention

The application provides an imaging lens, which comprises an optical lens group and a plurality of interval elements, and is characterized in that the optical lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens with optical power from an object side to an image side along an optical axis, wherein the sixth lens is a seventh lens, and the first lens has positive optical power and the object side of the first lens is a convex surface; the second lens has negative focal power, and the object side surface of the second lens is a convex surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; and the plurality of spacer elements comprises at least one spacer element located between any adjacent two lenses, the at least one spacer element being in contact with a lens located on an object side thereof, wherein the at least one spacer element located between the fifth lens and the sixth lens comprises a fifth spacer element and the at least one spacer element located between the sixth lens and the seventh lens comprises a sixth spacer element, and a total effective focal length f of the optical lens group, a thickness CP5 of the fifth spacer element, a thickness CP6 of the sixth spacer element, and a center thickness CT6 of the sixth lens on the optical axis satisfy: 15< f/(CP5+CP6-CT 6) <70.

In one embodiment of the present application, the third lens has negative optical power; and the seventh lens has negative optical power.

In one embodiment of the present application, the fifth lens has negative optical power, and an image side surface thereof is concave; and the sixth lens has positive focal power, and the image side surface of the sixth lens is concave.

In one embodiment of the present application, the object side of the fifth spacer element is in contact with the image side of the fifth lens and the object side of the sixth spacer element is in contact with the image side of the sixth lens.

In one embodiment of the present application, the plurality of spacer elements further comprises a first spacer element located between the first lens and the second lens, wherein an image side surface of the first lens and an edge region of an object side surface of the second lens bear against each other, and the first spacer element is not in contact with the object side surface of the second lens.

In one embodiment of the present application, a radius of curvature R11 of the object side surface of the sixth lens, a radius of curvature R12 of the image side surface of the sixth lens, a distance T56 of the fifth lens and the sixth lens on the optical axis, a distance T67 of the sixth lens and the seventh lens on the optical axis, an inner diameter d5s of the object side surface of the fifth spacer element, an inner diameter d6m of the image side surface of the sixth spacer element, and a distance EP56 of the fifth spacer element and the sixth spacer element on the optical axis satisfy: 20< (R12/R11) ((d 6m-d5 s)/(t56+ep 56+t67)) <40.

In one embodiment of the present application, the imaging lens further includes a barrel for accommodating the lens group and the plurality of spacer elements, wherein a total effective focal length f of the optical lens group, a dimension L of the barrel in the optical axis direction, an outer diameter D0m of an image side end of the barrel, and an inner diameter D0s of an object side end of the barrel satisfy: 7mm < f (L/(D0 m-D0 s)). Ltoreq.10 mm.

In one embodiment of the present application, the imaging lens further includes: a lens barrel for accommodating the lens group and the plurality of spacer elements; and the plurality of spacer elements further includes a first spacer element located between the first lens and the second lens, the first spacer element being in contact with an image side surface of the first lens, wherein an aperture value Fno of the optical lens group, an outer diameter D1s of an object side surface of the first spacer element, an inner diameter D1s of the object side surface of the first spacer element, a distance EP01 on the optical axis from an object side end of the lens barrel to the object side surface of the first spacer element, and a center thickness CT1 of the first lens on the optical axis satisfy: fno (D1 s-D1 s)/(EP 01-CT 1) no more than 10.0 and no more than 30.

In one embodiment of the present application, the plurality of spacer elements further includes a third spacer element located between the third lens and the fourth lens and a fourth spacer element located between the fourth lens and the fifth lens, wherein the third spacer element is in contact with an image side surface of the third lens, the fourth spacer element is in contact with an image side surface of the fourth lens, and a center thickness CT4 of the fourth lens on the optical axis, a thickness CP3 of the third spacer element, a thickness CP4 of the fourth spacer element, a distance EP34 of the third spacer element and the fourth spacer element on the optical axis satisfy: CT4-EP 34/(CP3+CP4) <5.0.

In one embodiment of the present application, the plurality of spacer elements further includes a third spacer element located between the third lens and the fourth lens and a fourth spacer element located between the fourth lens and the fifth lens, wherein the third spacer element is in contact with an image side surface of the third lens, the fourth spacer element is in contact with an image side surface of the fourth lens, and a distance T45 of the fourth lens and the fifth lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a thickness CP3 of the third spacer element, a thickness CP4 of the fourth spacer element, a distance EP34 of the third spacer element and the fourth spacer element on the optical axis satisfy: 1.5< EP34/(T45-CT 4) +CT4/(CP3+CP4) <20.

In one embodiment of the present application, the imaging lens further includes a barrel for accommodating the lens group and the plurality of spacer elements; and the plurality of spacer elements further includes a fourth spacer element located between the fourth lens and the fifth lens, the fourth spacer element being in contact with an image side surface of the fourth lens, and an outer diameter D0m of an image side end of the lens barrel, an outer diameter D0s of an object side end of the lens barrel, an inner diameter D4m of an image side surface of the fourth spacer element, an inner diameter D4s of an object side surface of the fourth spacer element, and a distance T45 on the optical axis between the fourth lens and the fifth lens satisfying: 4< (D0 m-D4 m)/T45- (D0 s-D4 s)/T45 is less than or equal to 7.

In one embodiment of the present application, the plurality of spacer elements further includes a second spacer element located between the second lens and the third lens and a third spacer element located between the third lens and the fourth lens, wherein the second spacer element is in contact with an image side surface of the second lens, the third spacer element is in contact with an image side surface of the third lens, and a total effective focal length f of the optical lens group, an entrance pupil diameter EPD of the optical lens group, an inner diameter d3s of an object side surface of the third spacer element, a distance EP23 of the second spacer element and the third spacer element on the optical axis, and a distance T23 of the second lens and the third lens on the optical axis satisfy: 8<f/(d 3 s-EPD)/(EP 23/T23) <38.

In one embodiment of the present application, the plurality of spacer elements further includes a first spacer element located between the first lens and the second lens, a second spacer element located between the second lens and the third lens, and a third spacer element located between the third lens and the fourth lens, wherein the first spacer element is in contact with an image side surface of the first lens, the second spacer element is in contact with an image side surface of the second lens, the third spacer element is in contact with an image side surface of the third lens, and an inner diameter d2s of an object side surface of the second spacer element, an inner diameter d3s of an object side surface of the third spacer element, a distance EP12 of the first spacer element from the second spacer element on the optical axis, a distance EP23 of the second spacer element from the third spacer element on the optical axis, and a distance T23 of the second lens and the third lens on the optical axis satisfy: 9< (d2s+d3s)/(EP 12+EP 23-T23) is less than or equal to 15.

In one embodiment of the present application, the plurality of spacer elements further includes a third spacer element located between the third lens and the fourth lens and a fourth spacer element located between the fourth lens and the fifth lens, wherein the third spacer element is in contact with an image side surface of the third lens, the fourth spacer element is in contact with an image side surface of the fourth lens, and a radius of curvature R7 of an object side surface of the fourth lens, a radius of curvature R13 of an object side surface of the seventh lens, an outer diameter D6m of an image side surface of the sixth spacer element, an outer diameter D3m of an image side surface of the third spacer element, a distance EP34 of the third spacer element from the fourth spacer element on the optical axis, a distance EP56 of the fifth spacer element from the sixth spacer element on the optical axis, a distance T45 of the fourth lens from the fifth lens on the optical axis, and a distance T67 of the sixth lens from the seventh lens on the optical axis are satisfied. 13 +|R7/R13| ((D6 m-D3 m)/(EP 34+T45+EP 56+T67)) <25.

In one embodiment of the present application, a lens barrel for accommodating the lens group and the plurality of spacer elements is further included, wherein a dimension L of the lens barrel in the optical axis direction, an outer diameter D0m of an image side end of the lens barrel, an outer diameter D0s of an object side end of the lens barrel, and a maximum field angle FOV of the optical lens group satisfy: 1.8.ltoreq.L/(D0 m-D0 s))/Tan (FOV/3.ltoreq.2.6.

The imaging lens of the present application includes a lens group composed of a plurality of (e.g., seven) lenses and a plurality of spacer elements, and by disposing the spacer elements between the lenses, the step difference between the lenses is reduced. Through the total effective focal length of reasonable setting camera lens for this camera lens has long burnt characteristics, in addition through the focal power of reasonable distribution first lens, second lens and third lens, face, the center thickness of sixth lens and the thickness of fifth interval element and sixth interval element, make interval element's total intensity control in suitable range, and can improve stray light, improve the stability of assemblage and improve the product yield.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:

FIG. 1 illustrates a parametric annotation schematic of an imaging lens according to the present application;

fig. 2 shows a schematic structural view of an optical lens group according to embodiment 1 of the present application;

fig. 3 shows a schematic cross-sectional view of an imaging lens including the optical lens group shown in fig. 2 according to embodiment 1 of the present application;

fig. 4 shows a schematic cross-sectional view of another image pickup lens including the optical lens group shown in fig. 2 according to embodiment 1 of the present application;

fig. 5 shows a schematic cross-sectional view of still another image pickup lens including the optical lens group shown in fig. 2 according to embodiment 1 of the present application;

fig. 6A to 6D show an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and an on-axis chromatic aberration curve, respectively, of the optical lens group according to embodiment 2 of the present application;

fig. 7 shows a schematic structural view of an optical lens group according to embodiment 2 of the present application;

fig. 8 is a schematic cross-sectional view showing an image pickup lens including the optical lens group shown in fig. 7 according to embodiment 2 of the present application;

fig. 9 shows a schematic cross-sectional view of another image pickup lens including the optical lens group shown in fig. 7 according to embodiment 2 of the present application;

fig. 10 shows a schematic cross-sectional view of still another image pickup lens including the optical lens group shown in fig. 7 according to embodiment 2 of the present application;

Fig. 11A to 11D show an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and an on-axis chromatic aberration curve, respectively, of the optical lens group according to embodiment 2 of the present application;

fig. 12 shows a schematic structural view of an optical lens group according to embodiment 3 of the present application;

fig. 13 is a schematic cross-sectional view showing an image pickup lens including the optical lens group shown in fig. 12 according to embodiment 3 of the present application;

fig. 14 shows a schematic cross-sectional view of another image pickup lens including the optical lens group shown in fig. 12 according to embodiment 3 of the present application;

fig. 15 shows a schematic cross-sectional view of still another image pickup lens including the optical lens group shown in fig. 12 according to embodiment 3 of the present application;

fig. 16A to 16D show an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and an on-axis chromatic aberration curve, respectively, of the optical lens group according to embodiment 3 of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.

It 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.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The following examples merely illustrate a few embodiments of the present utility model, which are described in greater detail and are not to be construed as limiting the scope of the utility model. It should be noted that, for those skilled in the art, several modifications and improvements may be made without departing from the concept of the present application, and these modifications and improvements fall within the scope of the present utility model, for example, the optical lens group, the lens barrel structure and the spacing element in the embodiments of the present application may be arbitrarily combined, and the optical lens group in one embodiment is not limited to be combined with the lens barrel structure, the spacing element and the like in the embodiment. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The features, principles, and other aspects of the present application are described in detail below.

The image pickup lens according to the exemplary embodiments of the present application may include an optical lens group including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens each having optical power, a plurality of spacer elements, and a lens barrel for accommodating the optical lens group and the plurality of optical elements.

In an exemplary embodiment, the first lens may have positive optical power, an object-side surface thereof may be convex, an image-side surface thereof may be concave, and the second lens may have negative optical power, an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the third lens element with negative refractive power may have a convex object-side surface or a concave image-side surface; the fourth lens element may have positive refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be convex; the fifth lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the sixth lens element with positive refractive power may have a convex object-side surface and a concave image-side surface; the seventh lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and wherein the image-side surface thereof may be concave. The effect of shooting can be effectively improved by reasonably distributing the surface shape and the focal power of each lens of the shooting lens.

In an exemplary embodiment, the imaging lens further includes a plurality of spacer elements including at least one spacer element located between any adjacent two lenses. The plurality of spacer elements may include, for example, a first spacer element between the first lens and the second lens, a second spacer element between the second lens and the third lens, a third spacer element between the third lens and the fourth lens, a fourth spacer element between the fourth lens and the fifth lens, a fifth spacer element between the fifth lens and the sixth lens, and a sixth spacer element between the sixth lens and the seventh lens.

In some exemplary embodiments, the image side of the first lens may be in contact with the object side of the first spacer element, the object side of the second lens may be in contact with the image side of the first spacer element, the image side of the second lens may be in contact with the object side of the second spacer element, the object side of the third lens may be in contact with the object side of the third spacer element, the object side of the fourth lens may be in contact with the image side of the third spacer element, the image side of the fourth lens may be in contact with the object side of the fourth spacer element, the object side of the fifth lens may be in contact with the image side of the fourth spacer element, the image side of the fifth lens may be in contact with the object side of the fifth spacer element, the object side of the sixth lens may be in contact with the image side of the fifth spacer element, and the image side of the sixth lens may be in contact with the object side of the sixth spacer element. Alternatively, any of the above-described first to sixth spacing elements may be in full contact with the non-optically effective portion of the lens located on its object side. Illustratively, any of the above-mentioned spacing elements may also be in full contact with the non-optically active portion of the lens on its image side, so that both the object side and the image side of each lens are supported by the spacing element, and the non-optically active portions of each adjacent lens are separated by the spacing element therebetween, which can effectively prevent the lens from suffering from poor performance due to shrinkage deformation after high temperature and high humidity. In addition, through reasonably setting the bearing relation between each interval element and the lens, the incident light range can be reasonably limited, light with poor edge quality is removed, off-axis aberration is reduced, stray light paths generated by reflection of each lens can be shielded, and the imaging quality of an optical system is improved.

In other exemplary embodiments, the non-optically effective area of the image side of at least one of the first to seventh lenses may be partially in contact with the object side of the adjacent spacer element, i.e., the radial dimension (e.g., the dimension perpendicular to the optical axis) of the non-optically effective portion of the image side of the at least one lens may be greater than the radial dimension (e.g., the dimension perpendicular to the optical axis) of the portion of the adjacent spacer element in contact with the at least one lens. For example, the non-optically active area of the image side of the first lens may be in partial contact with the object side of the first spacer element, wherein the radial dimension of the non-optically active portion of the first lens may be greater than the radial dimension of the portion of the first spacer element in contact with the first lens. In some examples, the edge regions of the non-optical regions of the image side of at least one lens may have a protruding structure protruding toward the optical axis direction such that the edge regions of the image side of the at least one lens may bear against each other with the corresponding edge regions of the object side of an adjacent lens. For example, the edge region of the image side surface of the first lens may have a convex structure protruding toward the optical axis direction, and the convex structure may contact the edge region of the object side surface of the second lens, so that the image side surface of the first lens and the edge region of the object side surface of the second lens bear against each other. In this example, the first spacer element may not be in contact with the object side surface of the second lens, so that the second lens can be effectively prevented from being deformed by the pressing of the first spacer element. In addition, the edge areas of the image side surface of the first lens and the object side surface of the second lens are mutually supported, so that the formability of the lens can be effectively ensured by the side thickness of each other, and the allowance is provided for improving the parasitic light problem possibly occurring in the follow-up process; in the case of improving curvature of field and dispersion by changing sagittal height, margin is also provided for improving performance yield.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the total effective focal length f of the optical lens group, the thickness CP5 of the fifth spacer element, the thickness CP6 of the sixth spacer element and the center thickness CT6 of the sixth lens on the optical axis satisfy between: 15< f/(CP5+CP6-CT 6) <70. The strength of the spacing element can be effectively ensured to be controlled in a proper range by meeting the conditions, and the problems of poor assembly stability, low performance yield and the like caused by large step difference between lenses can be improved by adding auxiliary bearing between the spacing element and the lens barrel; the stray light problem can be ameliorated by the rational arrangement of spacing elements.

It should be understood that, in order to make the structures and labels of the drawings clearer, the dimensions of the structures of the individual lenses and the individual spacing elements are merely given as examples in fig. 1, and the dimensions of the similar structures of the remaining lenses and the remaining spacing elements are defined by referring to the above-mentioned related dimensional structures and labels which have been labeled, and are not repeated herein.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the radius of curvature R11 of the object side of the sixth lens, the radius of curvature R12 of the image side of the sixth lens, the distance T56 of the fifth lens and the sixth lens on the optical axis, the distance T67 of the sixth lens and the seventh lens on the optical axis, the inner diameter d5s of the object side of the fifth spacing element, the inner diameter d6m of the image side of the sixth spacing element and the distance EP56 of the fifth spacing element and the sixth spacing element satisfy between: 20< (R12/R11) ((d 6m-d5 s)/(t56+ep 56+t67)) <40. The conditions are met, the gradual uniformity of the outline shape of the lens can be ensured, and the problems that the sixth lens is easy to break due to the fact that the center is too thin and the edge is easy to collapse due to the fact that the edge is too thin are avoided; and further avoiding the increase of processing cost caused by the technical problems of lens surface type, strength, injection molding fluidity molding and the like; in addition, the problem of lens weld marks caused by the fact that the thickness ratio of the sixth lens is too thick can be reduced, lens forming is improved, and the risk of weld marks is avoided in advance.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the imaging lens further comprises a barrel for accommodating the lens group and the plurality of spacer elements, wherein the total effective focal length f of the optical lens group, the dimension L of the barrel in the optical axis direction, the outer diameter D0m of the image side end of the barrel, and the inner diameter D0s of the object side end of the barrel satisfy: 7mm < f (L/(D0 m-D0 s)). Ltoreq.10 mm. Because the lens is supported by the lens barrel, the optical performance of the lens is greatly influenced by the structure of the lens barrel, the range of the conditions is met, the risks in the lens barrel forming process can be reduced, for example, the processing stability of a lens barrel copying mould and the risks of scratch in appearance are ensured, the roundness and the roundness of the inner diameter of the lens barrel are ensured to be in a reasonable range, and the assembling stability of the lens is improved.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens further comprises a barrel for accommodating the lens group and the plurality of spacer elements; and the plurality of spacer elements further includes a first spacer element located between the first lens and the second lens, the first spacer element being in contact with an image side surface of the first lens, wherein an aperture value Fno of the optical lens group, an outer diameter D1s of an object side surface of the first spacer element, an inner diameter D1s of the object side surface of the first spacer element, a distance EP01 on an optical axis from an object side end of the lens barrel to the object side surface of the first spacer element, and a center thickness CT1 of the first lens on the optical axis satisfy between: fno (D1 s-D1 s)/(EP 01-CT 1) no more than 10.0 and no more than 30. The requirements are met, the bearing surface of the lens barrel top surface can be ensured to have enough wall thickness, so that the bearing strength of the first lens is improved, the thickness of the light-transmitting hole can be ensured, and feathers and other stray lights caused by the fact that the light-transmitting hole is shiny when in injection molding due to insufficient thickness of the light-transmitting hole are avoided; under the condition of ensuring the thickness ratio and the diameter-thickness ratio of the lens, the thickness intensity of the head of the lens barrel is ensured, so that the light source is not directly penetrated through the lens barrel, and the stray light is improved.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the plurality of spacer elements further comprises a third spacer element located between the third lens and the fourth lens and a fourth spacer element located between the fourth lens and the fifth lens, wherein the third spacer element is in contact with the image side surface of the third lens, the fourth spacer element is in contact with the image side surface of the fourth lens, and a center thickness CT4 of the fourth lens on the optical axis, a thickness CP3 of the third spacer element, a thickness CP4 of the fourth spacer element, a distance EP34 of the third spacer element and the fourth spacer element on the optical axis satisfy: CT4-EP 34/(CP3+CP4) <5.0. The axial dimension of the spacing element is controlled to be within a reasonable range, and stray light of the spacing element can be optimized only by modifying the structure of the inner diameter surface, so that a stray light path of the spacing element can be intercepted in the meat reduction process, and the stray light caused by reflection of the spacing element can be reduced.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the plurality of spacer elements further comprises a third spacer element located between the third lens and the fourth lens and a fourth spacer element located between the fourth lens and the fifth lens, wherein the third spacer element is in contact with the image side of the third lens, the fourth spacer element is in contact with the image side of the fourth lens, and the distance T45 on the optical axis between the fourth lens and the fifth lens, the center thickness CT4 on the optical axis of the fourth lens, the thickness CP3 of the third spacer element, the thickness CP4 of the fourth spacer element, the distance EP34 on the optical axis between the third spacer element and the fourth spacer element satisfy: 1.5< EP34/(T45-CT 4) +CT4/(CP3+CP4) <20. The thickness of the spacing element is controlled by meeting the above conditional expression, when the metal spacing ring is required to be increased in the large-level-difference structure, the weight of the metal spacing ring can be controlled by controlling the size of the spacing element, so that the total weight of the lens is controlled within a reasonable range; the surface shape of the fourth lens can be ensured, and the performance yield is improved.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the camera lens further comprises a barrel for accommodating the lens group and the plurality of spacer elements; and the plurality of spacing elements further includes a fourth spacing element located between the fourth lens and the fifth lens, the fourth spacing element being in contact with the image side surface of the fourth lens, and an outer diameter D0m of the image side end of the barrel, an outer diameter D0s of the object side end of the barrel, an inner diameter D4m of the image side surface of the fourth spacing element, an inner diameter D4s of the object side surface of the fourth spacing element, and a distance T45 on the optical axis between the fourth lens and the fifth lens satisfying: 4< (D0 m-D4 m)/T45- (D0 s-D4 s)/T45 is less than or equal to 7. The lens barrel has the advantages that the lens barrel can be guaranteed to have enough rigidity and strength, the uniformity of the thickness of the lens barrel is improved, the molding risk of the lens barrel is improved, the processing stability of the lens barrel copying mold and the risk of scratch in appearance are guaranteed, meanwhile, the roundness and the roundness of the inner diameter of the lens barrel are guaranteed to be within the design requirement range of the lens, and the assembling stability of the lens barrel is improved; helping to control the size of the spacing element, intercept the stray light path and simultaneously help to reduce stray light caused by reflection of the spacing element; the size of the lens can be controlled to control the weight of the metal space ring, so that the total weight of the lens is controlled within a reasonable range.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the plurality of spacer elements further comprises a second spacer element located between the second lens and the third lens and a third spacer element located between the third lens and the fourth lens, wherein the second spacer element is in contact with the image side of the second lens, the third spacer element is in contact with the image side of the third lens, and the total effective focal length f of the optical lens group, the entrance pupil diameter EPD of the optical lens group, the inner diameter d3s of the object side of the third spacer element, the distance EP23 of the second spacer element from the third spacer element on the optical axis and the distance T23 of the second lens and the third lens on the optical axis satisfy: 8<f/(d 3 s-EPD)/(EP 23/T23) <38. The condition is met, the light-passing holes can be filled with thick meat, and feathers and other parasitic lights caused by the fact that the holes are shiny during injection molding due to insufficient meat thickness are avoided; the dislocation of the bearing position of the first lens and the bearing position of the top surface is reduced, and the deformation of the lens barrel is reduced; to help control the size of the spacer element to intercept the stray light path while helping to reduce stray light due to reflection by the spacer element.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the plurality of spacer elements further comprises a first spacer element located between the first lens and the second lens, a second spacer element located between the second lens and the third lens, and a third spacer element located between the third lens and the fourth lens, wherein the first spacer element is in contact with the image side of the first lens, the second spacer element is in contact with the image side of the second lens, the third spacer element is in contact with the image side of the third lens, and an inner diameter d2s of the object side of the second spacer element, an inner diameter d3s of the object side of the third spacer element, a distance EP12 of the first spacer element and the second spacer element on the optical axis, a distance EP23 of the second spacer element and the third spacer element on the optical axis, and a distance T23 of the second lens and the third lens on the optical axis satisfy: 9< (d2s+d3s)/(EP 12+EP 23-T23) is less than or equal to 15. The lens barrel meets the conditions, is beneficial to reducing dislocation of the bearing position of the first lens and the bearing position of the top surface and reducing deformation of the lens barrel; the outer diameter difference of the front three lenses or the front four lenses can be ensured to be not large, so that large step difference is prevented from occurring at the position, and the performance stability is facilitated; the dimension of the spacing element is controlled, so that the lenses are prevented from being cracked due to mutual contact when the reliability experiment is carried out; the spacer element may intercept the stray light path and help reduce stray light due to reflection by the spacer element.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the plurality of spacer elements further comprises a third spacer element located between the third lens and the fourth lens and a fourth spacer element located between the fourth lens and the fifth lens, wherein the third spacer element is in contact with the image side surface of the third lens, the fourth spacer element is in contact with the image side surface of the fourth lens, and the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer element, the outer diameter D3m of the image side surface of the third spacer element, the distance EP34 of the third spacer element and the fourth spacer element on the optical axis, the distance EP56 of the fifth spacer element and the sixth spacer element on the optical axis, the distance T45 of the fourth lens and the fifth lens on the optical axis, and the distance T67 of the sixth lens and the seventh lens on the optical axis satisfy: 13 +|R7/R13| ((D6 m-D3 m)/(EP 34+T45+EP 56+T67)) <25. The lens spacing device meets the above conditions, is favorable for controlling the uniformity of the inter-lens step difference, prevents large step difference from being gathered between certain two lenses, avoids the condition that the weight of the lens is out of tolerance due to the adoption of the metal spacing ring by the spacing element, and can further ensure that the maximum step difference size between the lenses is limited in a reasonable value range, effectively ensure the assembly stability and further ensure the performance and the yield.

In an exemplary embodiment, referring to the dimensioning of fig. 1, the imaging lens further comprises a lens barrel P0 for accommodating the lens group and the plurality of spacing elements, wherein a dimension L of the lens barrel P0 in the optical axis direction, an outer diameter D0m of an image side end of the lens barrel P0, an outer diameter D0s of an object side end of the lens barrel P0, and a maximum field angle FOV of the optical lens group satisfy: 1.8.ltoreq.L/(D0 m-D0 s))/Tan (FOV/3.ltoreq.2.6. Because all lenses are supported by the lens barrel, the optical performance of the lens is greatly influenced by the design of the lens barrel, the lens barrel can be ensured to have enough rigidity and strength by controlling the condition, the uniformity of the thickness of the lens barrel is improved, the molding risk of the lens barrel is improved, the processing stability of the lens barrel copying mold and the risk of scratch in appearance are ensured, meanwhile, the roundness and the roundness of the inner diameter of the lens barrel are ensured to be within the design requirement range of the lens, and the assembling stability of the lens barrel is improved.

In an exemplary embodiment, the optical lens group according to the present application may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging plane.

The optical lens group according to the above-described embodiments of the present application may employ a plurality of lenses, for example, the above seven-lens. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the low-order aberration of the imaging lens can be effectively balanced and controlled, the sensitivity of the tolerance can be reduced, and the miniaturization of the imaging lens can be kept.

In an embodiment of the present application, at least one of the mirrors of each of the first to seventh lenses is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, the object side surface and the image side surface of each of the first lens to the seventh lens are aspherical mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens can be varied to achieve the various results and advantages described in the present specification without departing from the technical solutions claimed herein. For example, although seven lenses are described as an example in the embodiment, the imaging lens is not limited to include seven lenses. The camera lens may also include other numbers of lenses, if desired.

Specific examples of the imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical lens group and an imaging lens according to embodiment 1 of the present application are described below with reference to fig. 2 to 6C. Fig. 2 shows a schematic structural view of an optical lens group according to embodiment 1 of the present application. Fig. 3 to 5 show schematic cross-sectional views of three kinds of imaging lenses including the optical lens group shown in fig. 2 according to embodiment 1 of the present application, respectively.

As shown in fig. 2, the optical lens assembly sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

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 convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative 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 positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

Table 1 shows the basic parameter table of the optical lens group of example 1, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 1

In the present embodiment, the total effective focal length f of the optical lens group is 8.17mm, the aperture value Fno of the optical lens group is 2.00, and the maximum field angle FOV of the optical lens group is 90.6 °.

In the present embodiment, the aspherical surface profile x included in the object side surface and the image side surface of the lens in the first lens E1 to the seventh lens E7 can be defined by, but not limited to, the following aspherical surface formulae:

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 Table 2 gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for the aspherical mirrors S1 to S14 in example 1.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-4.9721E-04

9.7965E-04

-1.2845E-03

1.0736E-03

-5.6620E-04

1.9136E-04

-4.1064E-05

S2

-6.4061E-03

1.5719E-03

-7.5666E-04

1.0296E-03

-9.4422E-04

5.2185E-04

-1.7849E-04

S3

-6.6099E-03

3.5631E-03

-2.4758E-03

3.5622E-03

-3.2824E-03

1.8352E-03

-6.3588E-04

S4

-1.4570E-03

1.9308E-03

1.3023E-03

-2.5610E-03

2.7694E-03

-1.9106E-03

8.3195E-04

S5

-1.5044E-02

1.0873E-03

2.5590E-04

-1.2890E-03

8.4471E-04

-2.7433E-04

4.3538E-05

S6

-1.8284E-02

3.6098E-03

-1.8085E-03

5.3748E-04

-9.9431E-05

9.1816E-06

0.0000E+00

S7

-1.1935E-02

-1.2174E-03

1.5185E-03

-1.0067E-03

4.6439E-04

-1.4216E-04

2.8579E-05

S8

-6.2376E-03

-2.5860E-03

1.0899E-03

-3.8401E-04

9.8845E-05

-1.5819E-05

1.4306E-06

S9

-2.8733E-02

1.3700E-02

-3.6082E-03

4.9096E-05

2.6689E-04

-9.0001E-05

1.5475E-05

S10

-1.0974E-01

4.4801E-02

-1.4303E-02

3.2619E-03

-5.1407E-04

5.4631E-05

-3.8184E-06

S11

-5.9648E-02

1.9734E-02

-6.1057E-03

1.3760E-03

-2.3082E-04

2.8562E-05

-2.5595E-06

S12

2.6395E-02

-8.3952E-03

1.8064E-03

-3.2016E-04

4.2838E-05

-4.0886E-06

2.7225E-07

S13

1.0980E-02

-4.3427E-03

1.2477E-03

-1.8422E-04

1.6471E-05

-9.7937E-07

4.0650E-08

S14

-6.7336E-04

-1.9398E-03

5.5294E-04

-8.5023E-05

8.1140E-06

-5.0322E-07

2.0625E-08

Face number

A18

A20

A22

A24

A26

A28

A30

S1

5.3149E-06

-3.7180E-07

1.0540E-08

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S2

3.6883E-05

-4.1939E-06

2.0035E-07

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S3

1.3369E-04

-1.5569E-05

7.6747E-07

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S4

-2.2018E-04

3.2379E-05

-2.0271E-06

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S5

-2.5230E-06

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S6

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S7

-3.5477E-06

2.4369E-07

-7.0647E-09

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S8

-5.3904E-08

-1.4160E-11

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S9

-1.5878E-06

9.7576E-08

-3.2995E-09

4.6914E-11

0.0000E+00

0.0000E+00

0.0000E+00

S10

1.6867E-07

-4.3438E-09

5.3848E-11

-1.5914E-13

0.0000E+00

0.0000E+00

0.0000E+00

S11

1.6402E-07

-7.4154E-09

2.3077E-10

-4.7042E-12

5.6581E-14

-3.0457E-16

0.0000E+00

S12

-1.2481E-08

3.8543E-10

-7.6561E-12

8.8395E-14

-4.5118E-16

0.0000E+00

0.0000E+00

S13

-1.2044E-09

2.5556E-11

-3.8217E-13

3.8524E-15

-2.3646E-17

6.7099E-20

0.0000E+00

S14

-5.4841E-10

8.4916E-12

-3.5049E-14

-1.4269E-15

3.2144E-17

-2.9461E-19

1.0759E-21

TABLE 2

As shown in fig. 3, the imaging lens 110 includes the above-described optical lens group, lens barrel, and a plurality of spacer elements. Of the above-described plurality of spacer elements, the first spacer element P1 is located between the first lens E1 and the second lens E2 and is in full contact with the non-optically effective area of the image side of the first lens E1, the image side of the first spacer element P1 is in full contact with the non-optically effective area of the object side of the second lens E2, the second spacer element P2 is located between the second lens E2 and the third lens E3 and is in full contact with the non-optically effective area of the image side of the second lens E2, the image side of the second spacer element P2 is in full contact with the non-optically effective area of the object side of the third lens E3, the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and is in full contact with the non-optically effective area of the image side of the third lens E3, the image side of the third spacer element P3 is in full contact with the non-optically effective area of the object side of the fourth lens E4, the fourth spacer element P4 and the spacer element P4b are located between the fourth lens E4 and the fifth lens E5 with the object side of the fourth spacer element P4 in full contact with the non-optically effective area of the image side of the fourth lens E4, the object side of the spacer element P4b is in contact with the image side of the fourth spacer element P4, the fifth spacer element P5 and the spacer element P5b are located between the fifth lens E5 and the sixth lens E6 with the object side of the fifth spacer element P5 in full contact with the non-optically effective area of the image side of the fifth lens E5, the object side of the spacer element P5b is in contact with the image side of the fifth spacer element P5, and the sixth spacer element P6 and the spacer element P6b are located between the sixth lens E6 and the seventh lens E7 with the object side of the sixth spacer element P6 in full contact with the non-optically effective area of the image side of the sixth lens E6, the object side surface of the spacer element P6b is in contact with the image side surface of the sixth spacer element P6. In the imaging lens 110, the fourth, fifth, and sixth spacer elements P4, P5, and P6 are spacers, and the remaining spacer elements are spacers. The spacing element can be used for coupling adjacent lenses and blocking external redundant light rays from entering, and the structural stability of the camera lens can be enhanced by reasonably arranging the positions of the spacing element and each lens.

As shown in fig. 4 and 5, the imaging lens 120 and the imaging lens 130 may have a similar structure to the imaging lens 110, except that in the imaging lens 120 and the imaging lens 130, a third spacer element P3b in contact with the image side surface of the third spacer element P3 is included between the third lens E3 and the fourth lens E4 in addition to the third spacer element P3 in contact with the image side surface of the third lens E3. In the imaging lens 120 and the imaging lens 130, the spacer element P3b, the fourth spacer element P4, the fifth spacer element P5, and the sixth spacer element P6 are spacers, and the remaining spacer elements are spacers.

Fig. 6A shows an astigmatism curve of the imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6B shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 6C shows a magnification chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 6D shows an on-axis chromatic aberration curve of the imaging system of embodiment 1, which represents the focus deviation of light rays of different wavelengths after passing through the lens. As can be seen from fig. 6A to 6D, the imaging lens provided in embodiment 1 can achieve good imaging quality.

Example 2

An optical lens group and an imaging lens according to embodiment 2 of the present application are described below with reference to fig. 7 to 11C. Fig. 7 shows a schematic structural view of an optical lens group according to embodiment 2 of the present application. Fig. 8 to 10 respectively show schematic sectional views of three kinds of imaging lenses including the optical lens group shown in fig. 7 according to embodiment 2 of the present application.

As shown in fig. 7, the optical lens assembly sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

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 concave, 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 convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative 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 positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

Table 3 shows the basic parameter table of the optical lens group of example 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 3 Table 3

In the present embodiment, the total effective focal length f of the optical lens group is 8.88mm, the aperture value Fno of the optical lens group is 1.95, and the maximum field angle FOV of the optical lens group is 83.5 °.

Table 4 shows the higher order coefficients that can be used for each of the mirrors of the aspherical surfaces S1 to S14 in embodiment 2, wherein each aspherical surface profile can be defined by the formula (1) given in embodiment 1 above.

TABLE 4 Table 4

As shown in fig. 8, the imaging lens 210 includes the above-described optical lens group, lens barrel, and a plurality of spacer elements. Of the above-described plurality of spacer elements, the first spacer element P1 is located between the first lens E1 and the second lens E2 and is in full contact with the non-optically effective area of the image side of the first lens E1, the image side of the first spacer element P1 is in full contact with the non-optically effective area of the object side of the second lens E2, the second spacer element P2 is located between the second lens E2 and the third lens E3 and the object side of the second spacer element P2 is in full contact with the non-optically effective area of the image side of the second lens E2, the image side of the second spacer element P2 is in full contact with the non-optically effective area of the object side of the third lens E3, the third spacer element P3 and the spacer element P3b are located between the third lens E3 and the fourth lens E4, and the object side of the third spacer element P3 is in full contact with the non-optically effective area of the image side of the third lens E3, the object side of the spacer element P3b is in full contact with the non-optically active area of the image side of the third spacer element P3, the fourth spacer element P4 and the spacer element P4b are located between the fourth lens E4 and the fifth lens E5 and the object side of the fourth spacer element P4 is in full contact with the non-optically active area of the image side of the fourth lens E4, the object side of the spacer element P4b is in full contact with the non-optically active area of the image side of the fourth spacer element P4, the fifth spacer element P5 and the spacer element P5b are located between the fifth lens E5 and the sixth lens E6 and the object side of the fifth spacer element P5 is in full contact with the non-optically active area of the image side of the fifth lens E5, the object side of the spacer element P5b is in full contact with the image side of the fifth spacer element P5, and a sixth spacer element P6 and a spacer element P6b are located between the sixth lens E6 and the seventh lens E7 and the object side of the sixth spacer element P6 is in full contact with the non-optically active area of the image side of the sixth lens E6, the object side of the spacer element P6b being in contact with the image side of the sixth spacer element P6. In the imaging lens 210, the third, fourth, fifth, and sixth spacer elements P3, P4, P5, and P6 are spacers, and the remaining spacer elements are spacers. The spacing element can be used for coupling adjacent lenses and blocking external redundant light rays from entering, and the structural stability of the camera lens can be enhanced by reasonably arranging the positions of the spacing element and each lens.

As shown in fig. 9, the image pickup lens 220 may have a similar structure to the image pickup lens 210, except that in the image pickup lens 220, only the fourth spacer element P4 contacting the image side surface of the fourth lens E4 may be included between the fourth lens E4 and the fifth lens E5. In the imaging lens 220, the third, fifth, and sixth spacer elements P3, P5, and P6 are spacers, and the remaining spacer elements are spacers.

As shown in fig. 10, the image pickup lens 230 may have a similar structure to the image pickup lens 220, except that in the image pickup lens 230, only the third spacer element P3 contacting the image side surface of the third lens E3 may be included between the third lens E3 and the fourth lens E4. In the imaging lens 230, the fifth and sixth spacer elements P5 and P6 are spacers, and the remaining spacer elements are spacers.

Fig. 11A shows an astigmatism curve of the imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 11B shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 11C shows a magnification chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 11D shows an on-axis chromatic aberration curve of the imaging system of embodiment 2, which represents the focus deviation of light rays of different wavelengths after passing through the lens. As can be seen from fig. 11A to 11D, the imaging lens provided in embodiment 2 can achieve good imaging quality.

Example 3

An optical lens group and an imaging lens according to embodiment 3 of the present application are described below with reference to fig. 12 to 16C. Fig. 11 shows a schematic structural view of an optical lens group according to embodiment 3 of the present application. Fig. 13 to 15 show schematic cross-sectional views of three kinds of imaging lenses including the optical lens group shown in fig. 12 according to embodiment 3 of the present application, respectively.

As shown in fig. 12, the optical lens assembly sequentially includes, from an object side to an image side along an optical axis: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

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 convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative 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 positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

Table 5 shows the basic parameter table of the optical lens group of example 3, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).

/>

TABLE 5

In the present embodiment, the total effective focal length f of the optical lens group is 8.95mm, the aperture value Fno of the optical lens group is 1.93, and the maximum field angle FOV of the optical lens group is 84.0 °.

Table 6 shows the higher order coefficients that can be used for each of the mirrors of the aspherical surfaces S2 to S14 in embodiment 3, wherein each aspherical surface profile can be defined by the formula (1) given in embodiment 1 above.

TABLE 6

As shown in fig. 13, the imaging lens 310 includes the above-described optical lens group, lens barrel, and a plurality of spacer elements. Among the above-described plurality of spacer elements, the first spacer element P1 is located between the first lens E1 and the second lens E2 and is in partial contact with the non-optically effective area of the image side surface of the first lens E1, and the edge area of the non-optically effective area of the image side surface of the first lens E1 may have a convex structure H that protrudes toward the optical axis direction, and the convex structure H may bear against the edge area of the object side surface of the second lens. In addition, the first spacer element P1 may not contact the object side surface of the second lens. The second spacer element P2 is located between the second lens E2 and the third lens E3 with the object-side surface of the second spacer element P2 being in full contact with the non-optically active area of the image-side surface of the second lens E2, the image-side surface of the second spacer element P2 being in full contact with the non-optically active area of the object-side surface of the third lens E3, the third spacer element P3 and the spacer element P3b being located between the third lens E3 and the fourth lens E4 with the object-side surface of the third spacer element P3 being in full contact with the non-optically active area of the image-side surface of the third lens E3, the object-side surface of the spacer element P3b being in full contact with the image-side surface of the third spacer element P3, the fourth spacer element P4 being located between the fourth lens E4 and the fifth lens E5 with the object-side surface of the fourth spacer element P4 being in full contact with the non-optically active area of the image-side surface of the fourth lens E4, the image side of the fourth spacer element P4 is in full contact with the non-optically active area of the object side of the fifth lens E5, the fifth spacer element P5 and the spacer element P5b are located between the fifth lens E5 and the sixth lens E6 and the object side of the fifth spacer element P5 is in full contact with the non-optically active area of the image side of the fifth lens E5, the object side of the spacer element P5b is in contact with the image side of the fifth spacer element P5, and the sixth spacer element P6 and the spacer element P6b are located between the sixth lens E6 and the seventh lens E7 and the object side of the sixth spacer element P6 is in full contact with the non-optically active area of the image side of the sixth lens E6 and the object side of the spacer element P6b is in contact with the image side of the sixth spacer element P6. In the imaging lens 310, the third, fifth, and sixth spacer elements P3, P5, and P6 are spacers, and the remaining spacer elements are spacers. The spacing element can be used for coupling adjacent lenses and blocking external redundant light rays from entering, and the structural stability of the camera lens can be enhanced by reasonably arranging the positions of the spacing element and each lens.

As shown in fig. 14, the imaging lens 320 includes the above-described optical lens group, barrel, and a plurality of spacer elements. Of the plurality of spacer elements, the first spacer element P1 is located between the first lens E1 and the second lens E2 and the object side of the first spacer element P1 is in full contact with the non-optically active area of the image side of the first lens E1, the image side of the first spacer element P1 is in full contact with the non-optically active area of the object side of the second lens E2, the second spacer element P2 is located between the second lens E2 and the third lens E3 and the object side of the second spacer element P2 is in full contact with the non-optically active area of the image side of the second lens E2, the image side of the second spacer element P2 is located between the third lens E3 and the fourth lens E4 and the object side of the third spacer element P3 is in full contact with the non-optically active area of the image side of the third lens E3, the image side of the third spacer element P3 is in full contact with the non-optically active area of the image side of the fourth lens E4, the fourth spacer element P4 is located between the fourth spacer element P4 and the image side of the fourth lens E2 and the fifth spacer element P5 is located between the image side of the fourth spacer element P2 and the fifth spacer element P5 is located between the image side of the fourth spacer element P4 and the fifth spacer element P5 is located between the fourth spacer element P4 and the fifth spacer element P5 and the image side of the fourth spacer element P4 is in full contact with the non-optically active area of the image side of the fourth spacer element P3, and a sixth spacer element P6 and a spacer element P6b are located between the sixth lens E6 and the seventh lens E7 and the object side of the sixth spacer element P6 is in full contact with the non-optically active area of the image side of the sixth lens E6, the object side of the spacer element P6b being in contact with the image side of the sixth spacer element P6. In the imaging lens 320, the fifth and sixth spacer elements P5 and P6 are spacers, and the remaining spacer elements are spacers. The spacing element can be used for coupling adjacent lenses and blocking external redundant light rays from entering, and the structural stability of the camera lens can be enhanced by reasonably arranging the positions of the spacing element and each lens.

As shown in fig. 15, the image pickup lens 330 may have a similar structure to the image pickup lens 310, except that in the image pickup lens 330, only the third spacer element P3 contacting the image side surface of the third lens E3 may be included between the third lens E3 and the fourth lens E4. In the imaging lens 330, the fifth and sixth spacer elements P5 and P6 are spacers, and the remaining spacer elements are spacers.

Fig. 16A shows an astigmatism curve of the imaging lens of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16B shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 16C shows a magnification chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 16D shows an on-axis chromatic aberration curve of the imaging system of embodiment 3, which represents the focus deviation of light rays of different wavelengths after passing through the lens. As can be seen from fig. 16A to 16D, the imaging lens provided in embodiment 3 can achieve good imaging quality.

Table 7 shows basic parameter tables of the lens barrels and the spacer elements of the three imaging lenses of examples 1 to 3, wherein each parameter in table 7 has a unit of millimeter (mm).

TABLE 7

In summary, examples 1 to 3 satisfy the relationships shown in table 8, respectively.

TABLE 8

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It should be understood by those skilled in the art that the scope of protection referred to in this application is not limited to the specific combination of the above technical features, but also encompasses other technical solutions formed by any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims (14)

1. The imaging lens comprises an optical lens group and a plurality of interval elements, and is characterized in that the optical lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a seventh lens from an object side to an image side along an optical axis, wherein,

the first lens has positive focal power, and the object side surface of the first lens is a convex surface;

the second lens has negative focal power, and the object side surface of the second lens is a convex surface;

the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; and the plurality of spacer elements comprises at least one spacer element located between any adjacent two lenses, wherein the at least one spacer element is in contact with a lens located on an object side thereof, wherein the at least one spacer element located between the fifth lens and the sixth lens comprises a fifth spacer element and the at least one spacer element located between the sixth lens and the seventh lens comprises a sixth spacer element, and a total effective focal length f of the optical lens group, a thickness CP5 of the fifth spacer element, a thickness CP6 of the sixth spacer element, and a center thickness CT6 of the sixth lens on the optical axis satisfy: 15 < f/(CP5+CP6-CT 6) < 70.

2. The imaging lens as claimed in claim 1, wherein,

the third lens has negative focal power; and

the seventh lens has negative optical power.

3. The imaging lens as claimed in claim 1, wherein,

the fifth lens has negative focal power, and the image side surface of the fifth lens is a concave surface; and

the sixth lens has positive focal power, and an image side surface of the sixth lens is concave.

4. The imaging lens system according to claim 1, wherein the plurality of spacer elements further comprises a first spacer element located between the first lens and the second lens, wherein an image side surface of the first lens and an object side surface of the second lens bear against each other and wherein the first spacer element is not in contact with the object side surface of the second lens.

5. The imaging lens system according to claim 1 or 3, wherein a radius of curvature R11 of an object side surface of the sixth lens, a radius of curvature R12 of an image side surface of the sixth lens, a distance T56 of the fifth lens and the sixth lens on the optical axis, a distance T67 of the sixth lens and the seventh lens on the optical axis, an inner diameter d5s of an object side surface of the fifth spacer element, an inner diameter d6m of an image side surface of the sixth spacer element, and a distance EP56 of the fifth spacer element and the sixth spacer element satisfy:

20＜(R12/R11)*((d6m-d5s)/(T56+EP56+T67))＜40。

6. The imaging lens according to claim 1, further comprising a barrel for accommodating the lens group and the plurality of spacer elements, wherein a total effective focal length f of the optical lens group, a dimension L of the barrel in the optical axis direction, an outer diameter D0m of an image side end of the barrel, and an inner diameter D0s of an object side end of the barrel satisfy: 7mm < f (L/(D0 m-D0 s)). Ltoreq.10 mm.

7. The imaging lens according to claim 1, further comprising:

a lens barrel for accommodating the lens group and the plurality of spacer elements; and the plurality of spacing elements further comprises a first spacing element located between the first lens and the second lens, and

the aperture value Fno of the optical lens group, the outer diameter D1s of the object side surface of the first spacing element, the inner diameter dls of the object side surface of the first spacing element, the distance EP01 from the object side end of the lens barrel to the object side surface of the first spacing element on the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy:

10.0≤Fno*(D1s-dls)/(EP01-CT1)≤30。

8. the imaging lens according to claim 1 or 2, wherein the plurality of spacer elements further includes a third spacer element between the third lens and the fourth lens and a fourth spacer element between the fourth lens and the fifth lens, and

The center thickness CT4 of the fourth lens on the optical axis, the thickness CP3 of the third spacer element, the thickness CP4 of the fourth spacer element, the distance EP34 between the third spacer element and the fourth spacer element on the optical axis satisfy: CT4-EP 34/(CP3+CP4) < 5.0.

9. The imaging lens according to claim 2 or 3, wherein the plurality of spacer elements further includes a third spacer element between the third lens and the fourth lens and a fourth spacer element between the fourth lens and the fifth lens, and

the distance T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the thickness CP3 of the third spacer element, the thickness CP4 of the fourth spacer element, and the distance EP34 between the third spacer element and the fourth spacer element on the optical axis satisfy: EP 34/(T45-CT 4) +CT4/(CP3+CP4) < 20, 1.5.

10. The imaging lens according to claim 1 or 3, further comprising a barrel for accommodating the lens group and the plurality of spacer elements; and the plurality of spacing elements further comprises a fourth spacing element located between the fourth lens and the fifth lens, and

An outer diameter D0m of an image side end of the lens barrel, an outer diameter D0s of an object side end of the lens barrel, an inner diameter D4m of an image side surface of the fourth spacing element, an inner diameter D4s of an object side surface of the fourth spacing element, and a distance T45 between the fourth lens and the fifth lens on the optical axis satisfy: 4 < (D0 m-D4 m)/T45- (D0 s-D4 s)/T45 is less than or equal to 7.

11. The imaging lens according to claim 1 or 2, wherein the plurality of spacer elements further includes a second spacer element between the second lens and the third lens and a third spacer element between the third lens and the fourth lens, and

the total effective focal length f of the optical lens group, the entrance pupil diameter EPD of the optical lens group, the inner diameter d3s of the object side surface of the third spacing element, the distance EP23 between the second spacing element and the third spacing element on the optical axis, and the distance T23 between the second lens and the third lens on the optical axis satisfy:

8＜f/(d3s-EPD)*(EP23/T23)＜38。

12. the imaging lens according to claim 1 or 2, wherein the plurality of spacer elements further includes a first spacer element between the first lens and the second lens, a second spacer element between the second lens and the third lens, and a third spacer element between the third lens and the fourth lens, and

An inner diameter d2s of the object side surface of the second spacer element, an inner diameter d3s of the third spacer element, a distance EP12 of the first spacer element from the second spacer element on the optical axis, a distance EP23 of the second spacer element from the third spacer element on the optical axis, and a distance T23 of the second lens and the third lens on the optical axis satisfy: and 9 < (d2s+d3s)/(EP 12+EP 23-T23) is less than or equal to 15.

13. The imaging lens according to claim 2 or 3, wherein the plurality of spacer elements further includes a third spacer element between the third lens and the fourth lens and a fourth spacer element between the fourth lens and the fifth lens, and

a radius of curvature R7 of the object side surface of the fourth lens, a radius of curvature R13 of the object side surface of the seventh lens, an outer diameter D6m of the image side surface of the sixth spacer element, an outer diameter D3m of the image side surface of the third spacer element, a distance EP34 of the third spacer element from the fourth spacer element on the optical axis, a distance EP56 of the fifth spacer element from the sixth spacer element on the optical axis, a distance T45 of the fourth lens and the fifth lens on the optical axis, and a distance T67 of the sixth lens and the seventh lens on the optical axis satisfy the following conditions:

13≤|R7/R13|*((D6m-D3m)/(EP34+T45+EP56+T67))＜25。

14. The imaging lens according to claim 1, further comprising a barrel for accommodating the lens group and the plurality of spacer elements, wherein a dimension L of the barrel in the optical axis direction, an outer diameter D0m of an image side end of the barrel, an outer diameter D0s of an object side end of the barrel, and a maximum field angle FOV of the optical lens group satisfy: 1.8.ltoreq.L/(D0 m-D0 s))/Tan (FOV/3.ltoreq.2.6.

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