CN220419664U - Optical pick-up lens - Google Patents
Optical pick-up lens Download PDFInfo
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- CN220419664U CN220419664U CN202320538006.9U CN202320538006U CN220419664U CN 220419664 U CN220419664 U CN 220419664U CN 202320538006 U CN202320538006 U CN 202320538006U CN 220419664 U CN220419664 U CN 220419664U
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Abstract
The application discloses an optical imaging lens. The optical imaging lens includes a lens group, a plurality of spacers, and a barrel for accommodating the lens group and the plurality of spacers. The lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which have optical power from an object side to an image side along an optical axis, wherein abbe numbers of at least four lenses of the first lens to the eighth lens are smaller than 30, and an air interval is arranged between any two adjacent lenses of the first lens to the eighth lens along the optical axis. The plurality of spacers includes a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer. The optical imaging lens satisfies: -5.0 < (EP 45+ EP 56)/(R9 + R12) < -0.5 and 1.5 < R15×TAN (Semi-FOV)/(D7 m-D7 m) < 9.5.
Description
Technical Field
The present application relates to the field of optical elements, and in particular, to an optical imaging lens.
Background
Currently, in many electronic products, an optical imaging lens plays an increasingly important role, and a user can take a picture through the imaging lens mounted on a mobile electronic device such as a mobile phone. In recent years, with the increase of application scenes of mobile electronic devices, shooting requirements are changing day by day. For example, in a scene like a multi-person photo, the requirements of users on the range of pictures which can be shot by a mobile phone camera lens are larger and larger, and meanwhile, the requirements on picture pixels are also higher and higher, so that many traditional lenses cannot meet the shooting requirements well, and the requirements of market development are not met.
Disclosure of Invention
An aspect of the present application provides an optical imaging lens including a lens group, a plurality of spacers, and a barrel for accommodating the lens group and the plurality of spacers. The lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which have optical power from an object side to an image side along an optical axis, wherein abbe numbers of at least four lenses of the first lens to the eighth lens are smaller than 30, and an air interval is arranged between any two adjacent lenses of the first lens to the eighth lens along the optical axis. The plurality of spacers includes: a fourth spacer located on an image side of the fourth lens and in contact with an image side portion of the fourth lens; a fifth spacer located on an image side of the fifth lens and in contact with an image side portion of the fifth lens; a sixth spacer located on an image side of the sixth lens and in contact with an image side portion of the sixth lens; and a seventh spacer located on the image side of the seventh lens and in contact with the image side portion of the seventh lens. The optical imaging lens can satisfy: -5.0 < (EP 45+ EP 56)/(r9 + R12) < -0.5 and 1.5 < r15×tan (Semi-FOV)/(D7 m-D7 m) < 9.5, wherein EP45 is a distance from the image side surface of the fourth spacer to the object side surface of the fifth spacer in the direction along the optical axis, EP56 is a distance from the image side surface of the fifth spacer to the object side surface of the sixth spacer in the direction along the optical axis, R9 is a radius of curvature of the object side surface of the fifth lens, R12 is a radius of curvature of the image side surface of the sixth lens, R15 is a radius of curvature of the object side surface of the eighth lens, semi-FOV is half of a maximum field angle of the optical imaging lens, D7m is an outer diameter of the image side surface of the seventh spacer, and D7m is an inner diameter of the image side surface of the seventh spacer.
In one embodiment, at least one of the object-side surface of the first lens to the image-side surface of the eighth lens is an aspherical mirror surface.
In one embodiment, the plurality of spacers further includes a first spacer located on an image side of the first lens and in contact with an image side portion of the first lens. The optical imaging lens can satisfy: 1.5 < (D1 s-D1 s)/(R1+R2) < 5.5, wherein D1s is the outer diameter of the object side surface of the first spacer, D1s is the inner diameter of the object side surface of the first spacer, R1 is the radius of curvature of the object side surface of the first lens, and R2 is the radius of curvature of the image side surface of the first lens.
In one embodiment, the optical imaging lens may satisfy: -2.5 < f1/EP01 < -1.5, wherein f1 is the effective focal length of the first lens, and EP01 is the separation distance in the direction along the optical axis from the object side end of the barrel to the object side of the first spacer.
In one embodiment, the optical imaging lens may satisfy: and (2) T12/CP1+f1/CT1 is less than or equal to 6.0 and less than 20.0, wherein CP1 is the maximum thickness of the first spacer, f1 is the effective focal length of the first lens, CT1 is the central thickness of the first lens on the optical axis, and T12 is the air interval between the first lens and the second lens on the optical axis.
In one embodiment, the plurality of spacers further includes a second spacer located on an image side of the second lens and in contact with an image side portion of the second lens. The optical imaging lens can satisfy: -6.0 < f 2/(d 2s-d1 m) < -3.5, where f2 is the effective focal length of the second lens, d1m is the inner diameter of the image side of the first spacer, and d2s is the inner diameter of the object side of the second spacer.
In one embodiment, the optical imaging lens may satisfy: 2.5 < D1m/R2+D2m/R4 < 4.5, wherein D1m is the outer diameter of the image side of the first spacer, D2m is the outer diameter of the image side of the second spacer, R2 is the radius of curvature of the image side of the first lens, and R4 is the radius of curvature of the image side of the second lens.
In one embodiment, the optical imaging lens may satisfy: 3.5 < (f1+f2)/EP 12 < 6.0, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and EP12 is the separation distance in the direction along the optical axis from the image side of the first spacer to the object side of the second spacer.
In one embodiment, the optical imaging lens may satisfy: 1.5 < (D2 s-D2 s)/R3 < 3.0, wherein D2s is the outer diameter of the object side of the second spacer, D2s is the inner diameter of the object side of the second spacer, and R3 is the radius of curvature of the object side of the second lens.
In one embodiment, the plurality of spacers further includes a third spacer located on an image side of the third lens and in contact with an image side portion of the third lens. The optical imaging lens can satisfy: -2.0 < (r5+r6)/(D3 s-D3 s) < -0.66, wherein R5 is the radius of curvature of the object-side surface of the third lens, R6 is the half of curvature of the image-side surface of the third lens, D3s is the outer diameter of the object-side surface of the third spacer, and D3s is the inner diameter of the object-side surface of the third spacer.
In one embodiment, the optical imaging lens may satisfy: 13.5 < f3/EP23+ T34/CP3 < 17.5, wherein f3 is the effective focal length of the third lens, T34 is the air separation of the third lens and the fourth lens on the optical axis, CP3 is the maximum thickness of the third spacer, and EP23 is the separation distance in the direction along the optical axis from the image side of the second spacer to the object side of the third spacer.
In one embodiment, the optical imaging lens may satisfy: 0 < (R8-R9)/(D4 s-D4 s) < 0.5, wherein R8 is the radius of curvature of the image side of the fourth lens element, R9 is the radius of curvature of the object side of the fifth lens element, D4s is the outer diameter of the object side of the fourth spacer element, and D4s is the inner diameter of the object side of the fourth spacer element.
In one embodiment, the optical imaging lens may satisfy: 8.0 < f4/CT4+T45/CP4 < 11.0, wherein f4 is the effective focal length of the fourth lens, T45 is the air gap on the optical axis between the fourth lens and the fifth lens, CT4 is the center thickness of the fourth lens on the optical axis, and CP4 is the maximum thickness of the fourth spacer.
In one embodiment, the optical imaging lens may satisfy: -12.5 < (r9+r10)/(D5 s-D4 m) < -8.5, wherein R9 is the radius of curvature of the object-side surface of the fifth lens, R10 is the radius of curvature of the image-side surface of the fifth lens, D5s is the outer diameter of the object-side surface of the fifth spacer, and D4m is the outer diameter of the image-side surface of the fourth spacer.
In one embodiment, the optical imaging lens may satisfy: -6.5 < f 6/(d 6s-d5 s) < -1.0, where f6 is the effective focal length of the sixth lens, d5s is the inner diameter of the object-side face of the fifth spacer, and d6s is the inner diameter of the object-side face of the sixth spacer.
In the exemplary embodiment of the present application, the optical imaging lens can have characteristics of wide angle, wide imaging range, high imaging quality, and the like by reasonably setting eight lenses, abbe numbers of each lens, air intervals between adjacent lenses, a plurality of spacers, and a lens barrel, and matching-5.0 < (EP 45+ep 56)/(r9+r12) < -0.5 and 1.5 < r15×tan (Semi-FOV)/(D7 m-D7 m) < 9.5. For example, by controlling the curvature radius of the fifth lens and the sixth lens, the outgoing light has a reasonable divergence angle, which is favorable for improving the illuminance of the main light and the overall brightness of the image plane, and by reasonably setting the interval between the fourth spacer and the fifth spacer and the interval between the fifth spacer and the sixth spacer, the edge thickness of the fifth lens and the sixth lens is favorable for being controlled in a reasonable range, and the processing and forming of the fifth lens and the sixth lens are favorable. For another example, the incidence angle of light can reach the design standard by reasonably designing half of the maximum field angle of the lens, so as to realize the basic requirement of the ultra-wide angle lens, and meanwhile, the eighth lens can be effectively controlled to have larger bending degree by reasonably setting the curvature radius of the eighth lens and the inner diameter and outer diameter parameters of the seventh spacer, the processing and forming of the eighth lens are improved, the emergent light trend is reasonably controlled, and the ideal image surface size and imaging quality are realized.
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. 1A and 1B are schematic structural views of an optical imaging lens in two embodiments of example 1, respectively;
fig. 2A and 2B show an on-axis chromatic aberration curve and an astigmatism curve, respectively, of the optical imaging lens of embodiment 1;
fig. 3A and 3B are schematic structural views of an optical imaging lens in two embodiments of example 2, respectively;
fig. 4A and 4B show an on-axis chromatic aberration curve and an astigmatism curve, respectively, of the optical imaging lens of embodiment 2;
fig. 5A and 5B are schematic structural views of an optical imaging lens in two embodiments of example 3, respectively;
fig. 6A and 6B show an on-axis chromatic aberration curve and an astigmatism curve, respectively, of the optical imaging lens of embodiment 3;
fig. 7A and 7B are schematic structural views of an optical imaging lens in two embodiments of example 4, respectively;
fig. 8A and 8B show an on-axis chromatic aberration curve and an astigmatism curve, respectively, of the optical imaging lens of embodiment 4;
FIG. 9 is a partial parametric schematic diagram of an optical imaging lens according to an embodiment of the present application; and
Fig. 10 is a schematic view of a part of an optical path in the optical imaging lens according to the embodiment 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.
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, and a first spacer may also be referred to as a second spacer or a third spacer, 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. It should be understood that the thickness, size and shape of the spacers and the lens barrel have also been slightly exaggerated in the drawings for convenience of explanation.
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 will be appreciated that the surface of each spacer closest to the subject is referred to as the object side of the spacer, and the surface of each spacer closest to the imaging plane is referred to as the image side of the spacer. The surface of the lens barrel closest to the object is referred to as the object side end of the lens barrel, and the surface of the lens barrel closest to the imaging surface is referred to as the image side end of the lens barrel.
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 represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. 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, which are all within the scope of protection of the present application, for example, the lens group (i.e., the first lens to the eighth lens) in each embodiment of the present application, the lens barrel structure, and the spacer may be arbitrarily combined, and the lens group in one embodiment is not limited to be combined with the lens barrel structure, the spacer, and the like of 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 optical imaging lens according to the exemplary embodiment of the present application may include eight lenses having optical power, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, respectively. The eight lenses are arranged in order from the object side to the image side along the optical axis. Any two adjacent lenses from the first lens to the eighth lens can have a spacing distance therebetween.
According to an exemplary embodiment of the present application, each of the first to eighth lenses may have an optical region for optical imaging and a non-optical region extending outward from an outer periphery of the optical region. In general, an optical region refers to a region of a lens for optical imaging, and a non-optical region is a structural region of the lens. In the assembly process of the optical imaging lens, spacers may be provided at the non-optical regions of the respective lenses by a process such as spot-gluing and the like and the respective lenses may be coupled into the lens barrel, respectively. In the imaging process of the optical pick-up lens, the optical area of each lens can transmit light from an object to form an optical path, so that a final optical image is formed; the non-optical areas of the assembled lenses are accommodated in the lens barrel which cannot transmit light, so that the non-optical areas do not directly participate in the imaging process of the optical imaging lens. It should be noted that for ease of description, the present application describes the individual lenses as being divided into two parts, an optical region and a non-optical region, but it should be understood that both the optical region and the non-optical region of the lens may be formed as a single piece during manufacture rather than as separate two parts.
The optical imaging lens according to the exemplary embodiment of the present application may include seven spacers respectively located between the first lens to the eighth lens, which are a first spacer, a second spacer, a third spacer, a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer, respectively. Specifically, the photographing lens may include a first spacer located at an image side of the first lens and in contact with an image side portion of the first lens, which may abut against a non-optical region of the image side of the first lens; a second spacer located on the image side of the second lens and in contact with the image side portion of the second lens, which may abut against a non-optical region of the image side of the second lens; a third spacer located on the image side of the third lens and in contact with the image side portion of the third lens, which may abut against a non-optical region of the image side of the third lens; a fourth spacer located on the image side of the fourth lens and in contact with the image side portion of the fourth lens, which may abut against a non-optical region of the image side of the fourth lens; a fifth spacer located on the image side of the fifth lens and in contact with the image side portion of the fifth lens, which may abut at the image side of the fifth lens; a sixth spacer located on the image side of the sixth lens and in contact with the image side portion of the sixth lens, which may abut at the image side of the sixth lens; and a seventh spacer located on the image side of the seventh lens and in contact with the image side portion of the seventh lens, which may abut at the image side of the seventh lens. For example, the first spacer may be in contact with the non-optical region of the image side of the first lens while being in contact with the non-optical region of the object side of the second lens. For example, the object-side surface of the first spacer may be in contact with the non-optical region of the image-side surface of the first lens, and the image-side surface of the first spacer may be in contact with the non-optical region of the object-side surface of the second lens.
The photographing lens according to the exemplary embodiments of the present application may include a barrel accommodating a lens group and a plurality of spacers. Illustratively, as shown in fig. 1A and 1B, the lens barrel may be an integrated lens barrel P0 for accommodating the first to eighth lenses E1 to E8 and the first to seventh spacers P1 to P7.
According to the exemplary embodiment of the application, the spacer can comprise at least one spacer, and the number, the thickness, the inner diameter and the outer diameter of the spacer are reasonably set, so that the assembly of the photographic lens is improved, the shielding of stray light is facilitated, and the imaging quality of the photographic lens is improved.
In an exemplary embodiment, at least four lenses of the first to eighth lenses have an abbe number of less than 30, and any adjacent two lenses of the first to eighth lenses have an air space therebetween along the optical axis. The optical imaging lens according to the present application can satisfy: -5.0 < (EP 45+ EP 56)/(r9 + R12) < -0.5 and 1.5 < r15×tan (Semi-FOV)/(D7 m-D7 m) < 9.5, wherein EP45 is a distance from the image side surface of the fourth spacer to the object side surface of the fifth spacer in the direction along the optical axis, EP56 is a distance from the image side surface of the fifth spacer to the object side surface of the sixth spacer in the direction along the optical axis, R9 is a radius of curvature of the object side surface of the fifth lens, R12 is a radius of curvature of the image side surface of the sixth lens, R15 is a radius of curvature of the object side surface of the eighth lens, semi-FOV is half of a maximum field angle of the optical imaging lens, D7m is an outer diameter of the image side surface of the seventh spacer, and D7m is an inner diameter of the image side surface of the seventh spacer. In the present application, the above-mentioned reasonable arrangement of eight lenses, abbe number of each lens, air interval between adjacent lenses, a plurality of spacers and lens barrel and matching-5.0 < (EP 45+ EP 56)/(r9 + R12) < -0.5 and 1.5 < r15×tan (Semi-FOV)/(D7 m-D7 m) < 9.5 can make the optical imaging lens have the characteristics of wide angle, wide imaging range, high imaging quality, etc. For example, by controlling the curvature radius of the fifth lens and the sixth lens, the outgoing light has a reasonable divergence angle, which is favorable for improving the illuminance of the main light and the overall brightness of the image plane, and by reasonably setting the interval between the fourth spacer and the fifth spacer and the interval between the fifth spacer and the sixth spacer, the edge thickness of the fifth lens and the sixth lens is favorable for being controlled in a reasonable range, and the processing and forming of the fifth lens and the sixth lens are favorable. For another example, the incidence angle of light can reach the design standard by reasonably designing half of the maximum field angle of the lens, so as to realize the basic requirement of the ultra-wide angle lens, and meanwhile, the eighth lens can be effectively controlled to have larger bending degree by reasonably setting the curvature radius of the eighth lens and the inner diameter and outer diameter parameters of the seventh spacer, the processing and forming of the eighth lens are improved, the emergent light trend is reasonably controlled, and the ideal image surface size and imaging quality are realized.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.5 < (D1 s-D1 s)/(R1+R2) < 5.5, wherein D1s is the outer diameter of the object side surface of the first spacer, D1s is the inner diameter of the object side surface of the first spacer, R1 is the radius of curvature of the object side surface of the first lens, and R2 is the radius of curvature of the image side surface of the first lens. Satisfy 1.5 < (D1 s-D1 s)/(R1+R2) < 5.5, can be through controlling the radius of curvature of the object side and the image side of first lens for the optical pick-up lens has bigger light ring, improves the overall brightness of camera lens, can control the external diameter size of first spacer through rationally setting up the inside and outside diameter parameter of first spacer simultaneously, and then not only be favorable to making the head diameter of camera lens satisfy the design requirement, be favorable to shielding the stray light ray of penetrating into first lens marginal zone through first spacer again, reduce the production of stray light facula.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -2.5 < f1/EP01 < -1.5, wherein f1 is the effective focal length of the first lens, and EP01 is the separation distance in the direction along the optical axis from the object side end of the barrel to the object side of the first spacer. Satisfies-2.5 < f1/EP01 < -1.5, the effective focal length of the first lens can be reasonably controlled, so that spherical aberration generated by the first lens can balance spherical aberration generated by other lenses of the optical imaging lens, further, the optical imaging lens can have better imaging quality on the axis, and meanwhile, the edge thickness of the first lens can be controlled within a reasonable range by reasonably setting the distance between the lens barrel and the first spacer, and further, the processing and forming of the first lens are improved.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: and (2) T12/CP1+f1/CT1 is less than or equal to 6.0 and less than 20.0, wherein CP1 is the maximum thickness of the first spacer, f1 is the effective focal length of the first lens, CT1 is the central thickness of the first lens on the optical axis, and T12 is the air interval between the first lens and the second lens on the optical axis. Satisfying 6.0 is less than or equal to T12/CP1+f1/CT1 < 20.0, can reducing the deflection angle of the light passing through the first lens through controlling the relevant technical parameters of the first lens, and is further beneficial to reducing the tolerance sensitivity of the lens, and meanwhile, through reasonably setting the maximum thickness of the first spacer, the stray light of the inner diameter surface of the first spacer can be effectively controlled, and further the definition of the imaging picture of the lens is improved.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -6.0 < f 2/(d 2s-d1 m) < -3.5, where f2 is the effective focal length of the second lens, d1m is the inner diameter of the image side of the first spacer, and d2s is the inner diameter of the object side of the second spacer. Satisfies-6.0 < f 2/(d 2s-d1 m) < -3.5, can make incident light effectively gather in the vicinity of the second lens by controlling the inner diameters of the first spacer and the second spacer and the effective focal length of the second lens, reduce the loss of incident light, improve the brightness of the lens, improve the definition of the picture, and simultaneously, be favorable for adjusting the divergence degree of the marginal light, reduce the parasitic light of the non-optical area of the second lens, and improve the pixels.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 2.5 < D1m/R2+D2m/R4 < 4.5, wherein D1m is the outer diameter of the image side of the first spacer, D2m is the outer diameter of the image side of the second spacer, R2 is the radius of curvature of the image side of the first lens, and R4 is the radius of curvature of the image side of the second lens. Satisfy 2.5 < D1m/R2+D2m/R4 < 4.5, can be through controlling first spacer and second spacer external diameter parameter for first lens and second lens external diameter parameter are in reasonable within range, make the trend of light in first lens and second lens mild, reduce and have big difference of level structure between first lens and the second lens, be favorable to camera lens stability of assemblage, simultaneously through rationally setting up the curvature radius of first lens and second lens, can effectively reduce epaxial colour difference, realize better imaging quality.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 3.5 < (f1+f2)/EP 12 < 6.0, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and EP12 is the separation distance in the direction along the optical axis from the image side of the first spacer to the object side of the second spacer. Satisfies 3.5 < (f1+f2)/EP 12 < 6.0, can effectively correct the distortion of the field of view in the outside of the image plane by controlling the effective focal lengths of the first lens and the second lens, thereby improving the imaging quality of the lens, and simultaneously, can enable the edge thickness of the second lens to be in the required range by reasonably setting the distance between the first spacer and the second spacer, improve the processability and the formability of the second lens, reduce the crab leg parasitic light caused by sink marks and the like.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.5 < (D2 s-D2 s)/R3 < 3.0, wherein D2s is the outer diameter of the object side of the second spacer, D2s is the inner diameter of the object side of the second spacer, and R3 is the radius of curvature of the object side of the second lens. Satisfies 1.5 < (D2 s-D2 s)/R3 < 3.0, and can effectively control the size of the annular belt of the second spacer by controlling the inner diameter and outer diameter parameters of the second spacer, so that the lens provided with the second spacer can not generate larger deformation after a reliability test, the reliability is improved, the spacer can be distinguished from other spacers at the same time, and can be used as foolproof identification, in addition, the light flux at the object side of the second lens can be reasonably controlled by reasonably setting the curvature radius of the object side of the second lens, and the imaging capability of the lens is improved.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -2.0 < (r5+r6)/(D3 s-D3 s) < -0.66, wherein R5 is the radius of curvature of the object-side surface of the third lens, R6 is the half of curvature of the image-side surface of the third lens, D3s is the outer diameter of the object-side surface of the third spacer, and D3s is the inner diameter of the object-side surface of the third spacer. Satisfies that-2.0 < (R5+R6)/(D3 s-D3 s) < -0.66, can effectively control the edge view field ray angle of the third lens within a reasonable range by controlling the curvature radius of the object side surface and the image side surface of the third lens, effectively reduce the sensitivity of the lens, and can reasonably control the thickness ratio trend of the third lens and improve the processability of the third lens by reasonably setting the inner diameter parameters and the outer diameter parameters of the third spacer.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 13.5 < f3/EP23+ T34/CP3 < 17.5, wherein f3 is the effective focal length of the third lens, T34 is the air separation of the third lens and the fourth lens on the optical axis, CP3 is the maximum thickness of the third spacer, and EP23 is the separation distance in the direction along the optical axis from the image side of the second spacer to the object side of the third spacer. Satisfies 13.5 < f3/EP23+T34/CP3 < 17.5, can effectively reduce spherical aberration and astigmatism by controlling the effective focal length of the third lens and the air interval between the third lens and the fourth lens, and can effectively control the front-rear distance of the third lens by reasonably setting the thickness of the third spacer and the distance between the second spacer and the third spacer, thereby being beneficial to reducing the field curvature sensitivity of the position close to the third lens, enabling the field curvature to be linearly changed as much as possible and improving the subsequent MTF yield.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < (R8-R9)/(D4 s-D4 s) < 0.5, wherein R8 is the radius of curvature of the image side of the fourth lens element, R9 is the radius of curvature of the object side of the fifth lens element, D4s is the outer diameter of the object side of the fourth spacer element, and D4s is the inner diameter of the object side of the fourth spacer element. Satisfies 0 < (R8-R9)/(D4 s-D4 s) < 0.5, the aspheric bending degree of the fourth lens and the fifth lens can be effectively controlled in a design target by controlling the inner diameter and the outer diameter of the fourth spacer and the curvature radius of the fourth lens and the fifth lens, and the light divergence angle passing through the fourth lens and the fifth lens can be effectively controlled while the forming processing of the fourth lens and the fifth lens is improved, so that the main light cannot deviate too much, marginal light can be reasonably absorbed, and the generation of return light in a non-optical area of the lens is reduced.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 8.0 < f4/CT4+T45/CP4 < 11.0, wherein f4 is the effective focal length of the fourth lens, T45 is the air gap on the optical axis between the fourth lens and the fifth lens, CT4 is the center thickness of the fourth lens on the optical axis, and CP4 is the maximum thickness of the fourth spacer. Satisfies 8.0 < f4/CT4+ T45/CP4 < 11.0, can effectively control the length between the fourth lens and the fifth lens by controlling the effective focal length of the fourth lens and the air interval between the fourth lens and the fifth lens, is favorable for reducing the lens length, and simultaneously is favorable for reducing the thickness ratio of the fourth lens, reducing the generation of weld marks and reducing the generation of stray light on the inner diameter surface of the fourth spacer by reasonably setting the center thickness of the fourth lens and the thickness of the fourth spacer.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -12.5 < (r9+r10)/(D5 s-D4 m) < -8.5, wherein R9 is the radius of curvature of the object-side surface of the fifth lens, R10 is the radius of curvature of the image-side surface of the fifth lens, D5s is the outer diameter of the object-side surface of the fifth spacer, and D4m is the outer diameter of the image-side surface of the fourth spacer. Satisfies-12.5 < (R9+R10)/(D5 s-D4 m) < -8.5, and the curvature radius of the fourth lens and the fifth lens can be controlled, so that the focal power of the lens close to the imaging surface of the optical imaging lens can be reduced, the optical imaging lens has better capability of balancing chromatic aberration and distortion, and meanwhile, the outer diameter gradient of the fourth spacer and the fifth spacer can be controlled within a set range by reasonably setting the outer diameter parameters of the fourth spacer and the fifth spacer, so that the assembly stability and the product consistency of the lens can be improved.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -6.5 < f 6/(d 6s-d5 s) < -1.0, where f6 is the effective focal length of the sixth lens, d5s is the inner diameter of the object-side face of the fifth spacer, and d6s is the inner diameter of the object-side face of the sixth spacer. Satisfies-6.5 < f 6/(d 6s-d5 s) < -1.0, and can effectively control the spherical aberration contribution of the sixth lens within a reasonable level by controlling the effective focal length of the sixth lens, thereby obtaining better imaging quality, and meanwhile, the inner diameter parameters of the fifth spacer and the sixth spacer are reasonably arranged, so that the deflection angle of light rays is favorably controlled within a reasonable range, the light rays at the edges are absorbed by the spacer, and stray light which is unfavorable for imaging is reduced.
In an exemplary embodiment, the optical imaging lens according to the present application further includes a stop disposed between the second lens and the third lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface. The application provides an optical pick-up lens with the characteristics of good assembly stability, high yield, wide angle, wide imaging range, high imaging quality, miniaturization, high imaging quality and the like. The optical imaging lens according to the above embodiment of the present application may employ a plurality of lenses, for example, the above eight lenses. Through reasonable distribution of focal power, surface type, material, center thickness and axial spacing among the lenses, incident light can be effectively converged, the total optical length of the imaging lens is reduced, and the processability of the imaging lens is improved, so that the optical imaging lens is more beneficial to production and processing. In the optical imaging lens according to the above embodiment of the present application, the spacer is provided between adjacent lenses, and the inner and outer diameters of the spacer are designed according to the optical path, so that stray light can be effectively blocked and eliminated, and the imaging quality of the lens can be improved. As shown in fig. 10, a schematic view of a path of a part of light rays 100 in the optical imaging lens is shown.
In an exemplary embodiment, the optical imaging lens provided in the present application may have a wide angle characteristic. By setting the number of lens sheets in the wide-angle lens to eight, the lens is beneficial to having a larger field angle by reasonable optical design and component arrangement, and the shooting range can meet most application scenes. Meanwhile, through reasonably setting related technical parameters of the eight-piece lens, the pixels of the lens are improved, so that market demands are met.
In the embodiments of the present application, at least one of the mirrors of each lens is an aspherical mirror, that is, at least one of the object side surface of the first lens to the image side surface of the eighth lens 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 at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of an object side surface and an image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are aspherical mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging lens may 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 eight lenses are described as an example in the embodiment, the optical imaging lens is not limited to include eight lenses. The optical imaging lens may also include other numbers of lenses, if desired.
Specific examples of the optical imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An optical imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1A to 2B. Fig. 1A and 1B show an optical imaging lens in two embodiments in example 1, respectively.
As shown in fig. 1A and 1B, the optical camera lens sequentially includes, from an object side to an image side: the first lens E1, the second lens E2, the stop STO (not shown), the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, a filter (not shown), and an imaging surface S19 (not shown).
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive 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 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 negative 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 concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 1 shows a basic parameter table of an optical imaging lens of embodiment 1, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 1
In this example, the total effective focal length f of the optical imaging lens is 2.45mm, and half of the maximum field angle of the optical imaging lens is 77.6 °.
As shown in fig. 1A and 1B, the optical imaging lens may include seven spacers respectively located between the first lens E1 to the eighth lens E8, which are respectively a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The optical imaging lens may further include a barrel P0 accommodating the first to eighth lenses E1 to E8 and the first to seventh spacers P1 to P7.
Table 2 shows basic parameter tables of each spacer in two embodiments in the optical imaging lens of example 1, wherein each parameter in table 2 has a unit of millimeter (mm).
| Structural parameters | Embodiment 1 | Embodiment 2 |
| D1s | 7.17 | 5.60 |
| d1s | 2.97 | 3.05 |
| EP01 | 1.38 | 1.34 |
| CP1 | 0.02 | 0.02 |
| d1m | 2.97 | 3.05 |
| d2s | 1.45 | 1.53 |
| D1m | 7.17 | 5.60 |
| D2m | 7.27 | 5.91 |
| EP12 | 0.71 | 0.74 |
| D2s | 7.27 | 5.91 |
| d2s | 1.45 | 1.53 |
| D3s | 7.37 | 6.20 |
| d3s | 1.92 | 2.01 |
| EP23 | 0.49 | 0.49 |
| CP3 | 0.02 | 0.04 |
| D4s | 7.47 | 7.55 |
| d4s | 2.41 | 2.50 |
| CP4 | 0.02 | 0.03 |
| D4m | 7.47 | 7.55 |
| D5s | 8.71 | 8.79 |
| d5s | 3.46 | 3.54 |
| d6s | 5.71 | 6.80 |
| EP45 | 0.79 | 0.77 |
| EP56 | 0.91 | 0.80 |
| D7m | 9.56 | 9.64 |
| d7m | 7.40 | 7.48 |
TABLE 2
It should be understood that in this example, the structures and parameters of each spacer in the two embodiments are merely exemplified, and the specific structures and actual parameters of each spacer are not explicitly defined. The specific structure and actual parameters of each spacer may be set in any suitable manner in actual production.
In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 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 from the top of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis directionThe distance vector height of the point; 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 3-1 and 3-2 give the higher order coefficients A that can be used for each of the aspherical mirror faces S1-S16 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.7563E+00 | -3.9289E-01 | 1.2721E-01 | -5.2978E-02 | 2.3713E-02 | -1.0926E-02 | 5.1647E-03 |
| S2 | 5.0151E-01 | -8.6232E-02 | 1.7440E-02 | -1.3476E-02 | 2.5719E-03 | 1.2169E-03 | 5.0392E-04 |
| S3 | 3.1855E-02 | 8.9212E-03 | -6.3954E-03 | -5.8033E-03 | -3.3644E-04 | 8.2288E-04 | 4.9409E-04 |
| S4 | 9.9704E-02 | 9.6497E-03 | -3.6927E-04 | -7.3981E-04 | -8.7306E-05 | 3.7480E-05 | 4.2257E-05 |
| S5 | 1.1271E-02 | 5.4168E-04 | -3.7354E-05 | 5.5302E-06 | -6.6670E-06 | 2.3680E-06 | -1.8618E-07 |
| S6 | 8.8378E-03 | 3.3454E-03 | -1.0002E-04 | -2.6697E-04 | -2.9037E-04 | -2.5929E-04 | -1.8963E-04 |
| S7 | 2.8189E-03 | -2.2192E-03 | 6.8479E-05 | 6.6902E-04 | 3.8672E-04 | 7.5680E-05 | 1.3870E-05 |
| S8 | -1.8124E-01 | -2.3312E-03 | 5.7863E-03 | 6.0001E-04 | 3.4379E-03 | -5.1290E-04 | 6.6818E-04 |
| S9 | -2.8115E-01 | -8.4452E-03 | 1.3799E-02 | 9.2264E-05 | 5.4095E-03 | -2.2302E-03 | 3.0105E-04 |
| S10 | -1.2791E-02 | -4.5580E-03 | 2.6960E-02 | -7.4329E-03 | 5.8766E-03 | -4.2328E-03 | 1.2544E-03 |
| S11 | 1.6485E-01 | -2.4767E-01 | 4.0421E-02 | -9.4170E-03 | 1.6623E-02 | 1.3910E-04 | 3.3276E-03 |
| S12 | -1.8971E+00 | 8.7106E-02 | -9.7418E-02 | 3.0085E-02 | -2.2171E-02 | 7.0297E-03 | -2.1091E-03 |
| S13 | -4.1361E+00 | 6.3082E-01 | -1.1534E-01 | 4.5517E-02 | -2.3895E-02 | 1.1107E-02 | 3.4476E-03 |
| S14 | -3.2491E-01 | -2.6304E-01 | 8.9619E-02 | -4.8378E-02 | 6.6619E-02 | -3.3179E-02 | 3.4151E-02 |
| S15 | -6.9775E+00 | 1.8683E+00 | -6.9292E-01 | 3.3931E-01 | -1.6354E-01 | 5.4498E-02 | -1.0526E-02 |
| S16 | -1.0385E+01 | 2.3456E+00 | -8.0837E-01 | 4.1061E-01 | -2.0303E-01 | 8.4280E-02 | -5.7535E-02 |
TABLE 3-1
TABLE 3-2
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve of the optical imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. As can be seen from fig. 2A and 2B, 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. 3A to 4B. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3A and 3B show the optical imaging lens in the two embodiments in example 2, respectively.
As shown in fig. 3A and 3B, the optical camera lens sequentially includes, from an object side to an image side: the first lens E1, the second lens E2, the stop STO (not shown), the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, a filter (not shown), and an imaging surface S19 (not shown).
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive 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 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 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 concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the optical imaging lens is 2.34mm, and half of the maximum field angle of the optical imaging lens is 70.5 °.
As shown in fig. 3A and 3B, the optical imaging lens may include seven spacers respectively located between the first lens E1 to the eighth lens E8, which are respectively a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The optical imaging lens may further include a barrel P0 accommodating the first to eighth lenses E1 to E8 and the first to seventh spacers P1 to P7.
It should be understood that in this example, the structures and parameters of each spacer in the two embodiments are merely exemplified, and the specific structures and actual parameters of each spacer are not explicitly defined. The specific structure and actual parameters of each spacer may be set in any suitable manner in actual production.
Table 4 shows a basic parameter table of the optical imaging lens of embodiment 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 5 shows basic parameter tables of each spacer in two embodiments in the optical imaging lens of example 2, wherein each parameter in table 5 has a unit of millimeter (mm). Tables 6-1, 6-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface profiles can be defined by equation (1) given in example 1 above.
TABLE 4 Table 4
TABLE 5
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.7741E+00 | -3.8904E-01 | 1.2769E-01 | -5.1501E-02 | 2.3768E-02 | -1.1341E-02 | 5.2418E-03 |
| S2 | 5.3405E-01 | -7.9208E-02 | 1.6737E-02 | -1.2446E-02 | 3.9911E-03 | 5.9847E-04 | 2.8219E-04 |
| S3 | 5.1049E-02 | 9.6891E-03 | -5.8894E-03 | -4.7854E-03 | -3.3184E-04 | 3.0784E-04 | 1.3456E-04 |
| S4 | 1.0142E-01 | 9.0929E-03 | -5.1593E-04 | -7.9596E-04 | -1.7035E-04 | -5.4598E-05 | -4.4323E-06 |
| S5 | 1.0800E-02 | 3.7842E-04 | -4.4049E-05 | -3.8921E-06 | -2.7351E-06 | 5.0687E-08 | -7.7596E-07 |
| S6 | 7.6485E-03 | 3.4932E-03 | -2.0688E-04 | -4.4035E-04 | -3.1533E-04 | -2.0826E-04 | -1.2579E-04 |
| S7 | 2.8189E-03 | -2.2192E-03 | 6.8479E-05 | 6.6902E-04 | 3.8672E-04 | 7.5680E-05 | 1.3870E-05 |
| S8 | -1.7367E-01 | -2.7339E-03 | 5.8771E-03 | 2.5682E-04 | 2.1854E-03 | -2.1928E-04 | 5.7242E-04 |
| S9 | -2.9525E-01 | -1.0186E-02 | 1.6747E-02 | -3.4545E-04 | 3.1135E-03 | -1.5102E-03 | 3.6115E-04 |
| S10 | -3.2853E-02 | -8.2133E-03 | 3.1247E-02 | -9.4499E-03 | 4.4751E-03 | -3.5356E-03 | 4.3534E-04 |
| S11 | 1.4581E-01 | -2.5971E-01 | 5.1288E-02 | -9.7738E-03 | 1.7705E-02 | 5.5846E-04 | 4.2732E-03 |
| S12 | -2.0836E+00 | 1.2378E-01 | -9.0600E-02 | 2.0901E-02 | -2.2102E-02 | 1.1183E-02 | -2.8611E-03 |
| S13 | -4.2977E+00 | 7.1349E-01 | -1.2440E-01 | 4.3355E-02 | -1.3283E-02 | 1.1028E-02 | -3.1860E-03 |
| S14 | -6.7240E-01 | -2.1467E-01 | 4.9045E-02 | -2.3386E-02 | 6.7359E-02 | -3.3441E-02 | 2.0796E-02 |
| S15 | -7.0086E+00 | 1.8453E+00 | -7.1630E-01 | 3.3589E-01 | -1.4734E-01 | 4.8824E-02 | -8.6112E-03 |
| S16 | -1.0507E+01 | 2.3053E+00 | -8.7306E-01 | 3.8802E-01 | -1.8877E-01 | 8.9833E-02 | -3.2978E-02 |
TABLE 6-1
TABLE 6-2
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve of the optical imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. As can be seen from fig. 4A and 4B, 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. 5A to 6B. Fig. 5A and 5B show the optical imaging lens in the two embodiments in example 3, respectively.
As shown in fig. 5A and 5B, the optical camera lens sequentially includes, from an object side to an image side: the first lens E1, the second lens E2, the stop STO (not shown), the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, a filter (not shown), and an imaging surface S19 (not shown).
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive 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 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 negative 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 convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the optical imaging lens is 2.36mm, and half of the maximum field angle of the optical imaging lens is 69.7 °.
As shown in fig. 5A and 5B, the optical imaging lens may include seven spacers respectively located between the first lens E1 to the eighth lens E8, which are respectively a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The optical imaging lens may further include a barrel P0 accommodating the first to eighth lenses E1 to E8 and the first to seventh spacers P1 to P7.
It should be understood that in this example, the structures and parameters of each spacer in the two embodiments are merely exemplified, and the specific structures and actual parameters of each spacer are not explicitly defined. The specific structure and actual parameters of each spacer may be set in any suitable manner in actual production.
Table 7 shows a basic parameter table of the optical imaging lens of embodiment 3, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows basic parameter tables of each spacer of the two embodiments in the optical imaging lens of example 3, wherein each parameter in table 8 has a unit of millimeter (mm). Tables 9-1, 9-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface profiles can be defined by equation (1) given in example 1 above.
TABLE 7
TABLE 8
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.5116E+00 | -3.2454E-01 | 1.0450E-01 | -4.2109E-02 | 1.8636E-02 | -8.3064E-03 | 3.7565E-03 |
| S2 | 4.2066E-01 | -6.8015E-02 | 1.8191E-02 | -1.0675E-02 | 2.2563E-03 | 4.0349E-04 | 2.7238E-04 |
| S3 | 4.4391E-02 | 1.1291E-02 | -7.0606E-04 | -2.7345E-03 | -3.8245E-04 | 6.7236E-05 | 3.6087E-05 |
| S4 | 8.5597E-02 | 7.3400E-03 | -2.6097E-04 | -4.6810E-04 | -7.3168E-05 | 5.6637E-06 | 1.3252E-05 |
| S5 | 1.0220E-02 | 3.4390E-04 | -4.0091E-05 | -5.9678E-07 | -1.5565E-06 | -8.0176E-07 | -2.5430E-07 |
| S6 | 4.0039E-03 | 2.1861E-03 | 8.1001E-05 | -1.3702E-05 | -4.5720E-06 | 4.8903E-07 | 5.2509E-07 |
| S7 | 3.2363E-03 | -1.5740E-03 | -4.5620E-04 | 3.8548E-05 | 9.6838E-05 | 9.0532E-06 | 2.1842E-05 |
| S8 | -1.4964E-01 | -4.9539E-03 | 3.2901E-03 | -6.7681E-04 | 1.5392E-03 | -5.9876E-04 | 2.7114E-04 |
| S9 | -2.3391E-01 | -1.4878E-02 | 9.2184E-03 | -1.8541E-03 | 2.9946E-03 | -1.1503E-03 | 2.3769E-04 |
| S10 | -3.1497E-02 | -2.1088E-02 | 2.1036E-02 | -7.9683E-03 | 4.5011E-03 | -1.9355E-03 | 7.8307E-04 |
| S11 | 1.4214E-01 | -1.8597E-01 | 2.8732E-02 | -1.8249E-02 | 6.4968E-03 | -4.8134E-03 | 2.0825E-03 |
| S12 | -1.5570E+00 | 1.0499E-01 | -6.2275E-02 | 2.7571E-02 | -1.8688E-02 | 6.7748E-03 | 8.9551E-04 |
| S13 | -3.3649E+00 | 4.6303E-01 | -7.6406E-02 | 2.7060E-02 | -1.1087E-02 | -1.7695E-03 | 1.9513E-03 |
| S14 | -1.5438E-01 | -2.3268E-01 | 4.5205E-02 | -5.9831E-02 | 7.0020E-02 | -3.4054E-02 | 1.5661E-02 |
| S15 | -6.5278E+00 | 1.7390E+00 | -6.6983E-01 | 3.0794E-01 | -1.4050E-01 | 4.2518E-02 | -5.5010E-03 |
| S16 | -1.0312E+01 | 2.3258E+00 | -8.5465E-01 | 4.0813E-01 | -1.9605E-01 | 8.2549E-02 | -5.0305E-02 |
TABLE 9-1
TABLE 9-2
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the optical imaging lens of embodiment 3, which indicates meridional image plane curvature and sagittal image plane curvature. As can be seen from fig. 6A and 6B, 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. 7A to 8B. Fig. 7A and 7B show the optical imaging lens in the two embodiments in example 4, respectively.
As shown in fig. 7A and 7B, the optical camera lens sequentially includes, from an object side to an image side: the first lens E1, the second lens E2, the stop STO (not shown), the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, a filter (not shown), and an imaging surface S19 (not shown).
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive 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 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 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 convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the total effective focal length f of the optical imaging lens is 2.37mm, and half of the maximum field angle of the optical imaging lens is 66.3 °.
As shown in fig. 7A and 7B, the optical imaging lens may include seven spacers respectively located between the first lens E1 to the eighth lens E8, which are respectively a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7. The optical imaging lens may further include a barrel P0 accommodating the first to eighth lenses E1 to E8 and the first to seventh spacers P1 to P7.
It should be understood that in this example, the structures and parameters of each spacer in the two embodiments are merely exemplified, and the specific structures and actual parameters of each spacer are not explicitly defined. The specific structure and actual parameters of each spacer may be set in any suitable manner in actual production.
Table 10 shows a basic parameter table of the optical imaging lens of embodiment 4, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 11 shows basic parameter tables of each spacer of the two embodiments in the optical imaging lens of example 4, wherein each parameter in table 11 is in millimeters (mm). Tables 12-1, 12-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, where each of the aspherical surface profiles can be defined by equation (1) given in example 1 above.
Table 10
TABLE 11
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.5101E+00 | -3.2475E-01 | 1.0495E-01 | -4.1925E-02 | 1.8613E-02 | -8.3202E-03 | 3.7559E-03 |
| S2 | 4.7178E-01 | -6.1744E-02 | 1.8633E-02 | -9.7706E-03 | 2.7180E-03 | 7.7391E-04 | 3.5177E-04 |
| S3 | 5.4499E-02 | 1.2166E-02 | -5.8504E-04 | -2.1736E-03 | -2.7478E-04 | 4.5000E-05 | 2.0290E-05 |
| S4 | 8.5783E-02 | 7.0553E-03 | -2.2555E-04 | -4.5636E-04 | -6.4919E-05 | -1.9215E-05 | 5.8283E-06 |
| S5 | 9.9942E-03 | 2.7156E-04 | -5.0985E-05 | -3.0953E-06 | -2.9008E-06 | -4.3687E-07 | -5.6248E-07 |
| S6 | 3.0288E-03 | 1.9463E-03 | 9.9160E-05 | -2.3262E-05 | -7.3081E-06 | -2.3514E-06 | 1.1643E-06 |
| S7 | 3.2363E-03 | -1.5740E-03 | -4.5620E-04 | 3.8548E-05 | 9.6838E-05 | 9.0532E-06 | 2.1842E-05 |
| S8 | -1.4239E-01 | -5.3563E-03 | 3.6480E-03 | -9.0530E-04 | 1.3820E-03 | -5.7003E-04 | 2.3186E-04 |
| S9 | -2.3617E-01 | -1.5094E-02 | 9.7840E-03 | -2.0313E-03 | 2.5049E-03 | -1.1655E-03 | 1.4305E-04 |
| S10 | -3.5328E-02 | -2.1749E-02 | 2.1895E-02 | -7.8412E-03 | 4.1936E-03 | -1.7130E-03 | 6.1849E-04 |
| S11 | 1.1514E-01 | -1.9470E-01 | 2.5371E-02 | -1.7443E-02 | 6.5946E-03 | -3.7158E-03 | 1.5698E-03 |
| S12 | -1.5700E+00 | 1.0259E-01 | -5.8420E-02 | 2.8304E-02 | -1.8785E-02 | 7.8903E-03 | -7.0210E-04 |
| S13 | -3.3757E+00 | 4.8662E-01 | -6.8518E-02 | 1.1861E-02 | -6.1185E-03 | 8.8705E-03 | 2.1771E-03 |
| S14 | -4.8541E-01 | -1.9978E-01 | 3.5440E-02 | -6.5479E-02 | 6.5164E-02 | -2.6957E-02 | 1.3735E-02 |
| S15 | -6.5075E+00 | 1.7351E+00 | -6.7494E-01 | 3.0787E-01 | -1.4158E-01 | 4.0185E-02 | -6.8537E-03 |
| S16 | -1.0326E+01 | 2.3346E+00 | -8.6071E-01 | 4.0570E-01 | -1.9991E-01 | 8.1629E-02 | -4.9376E-02 |
TABLE 12-1
TABLE 12-2
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 8B shows an astigmatism curve of the optical imaging lens of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. As can be seen from fig. 8A and 8B, the optical imaging lens provided in embodiment 4 can achieve good imaging quality.
In summary, examples 1 to 4 satisfy the relationships shown in tables 13-1 and 13-2, respectively.
TABLE 13-1
TABLE 13-2
The present application also provides an imaging device, the electron-sensitive element of which may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (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 foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but also covers other technical solutions which may be formed by any combination of the features described above or their equivalents without departing from the inventive concept. 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. An optical imaging lens, comprising:
the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which have optical power from an object side to an image side along an optical axis, wherein abbe numbers of at least four lenses from the first lens to the eighth lens are smaller than 30, and an air interval is arranged between any two adjacent lenses from the first lens to the eighth lens along the optical axis;
a plurality of spacers, comprising:
a fourth spacer located on an image side of the fourth lens and in contact with an image side portion of the fourth lens;
a fifth spacer located on an image side of the fifth lens and in contact with an image side portion of the fifth lens;
a sixth spacer located on an image side of the sixth lens and in contact with an image side portion of the sixth lens;
a seventh spacer located on an image side of the seventh lens and in contact with an image side portion of the seventh lens; and
a lens barrel for accommodating the lens group and the plurality of spacers;
wherein, the optical pick-up lens satisfies: -5.0 < (EP 45+ EP 56)/(r9 + R12) < -0.5 and 1.5 < r15×tan (Semi-FOV)/(D7 m-D7 m) < 9.5, wherein EP45 is a separation distance of the image side surface of the fourth spacer to the object side surface of the fifth spacer in the direction along the optical axis, EP56 is a separation distance of the image side surface of the fifth spacer to the object side surface of the sixth spacer in the direction along the optical axis, R9 is a radius of curvature of the object side surface of the fifth lens, R12 is a radius of curvature of the image side surface of the sixth lens, R15 is a radius of curvature of the object side surface of the eighth lens, semi-FOV is half of a maximum field angle of the optical imaging lens, D7m is an outer diameter of the image side surface of the seventh spacer, and D7m is an inner diameter of the image side surface of the seventh spacer.
2. The optical imaging lens according to claim 1, wherein the plurality of spacers further includes a first spacer which is located on an image side of the first lens and is in contact with an image side portion of the first lens,
the optical imaging lens satisfies: 1.5 < (D1 s-D1 s)/(R1+R2) < 5.5, wherein D1s is the outer diameter of the object side surface of the first spacer, D1s is the inner diameter of the object side surface of the first spacer, R1 is the radius of curvature of the object side surface of the first lens, and R2 is the radius of curvature of the image side surface of the first lens.
3. The optical imaging lens according to claim 2, wherein the optical imaging lens satisfies: -2.5 < f1/EP01 < -1.5, wherein f1 is the effective focal length of the first lens, EP01 is the separation distance in the direction along the optical axis from the object side end of the barrel to the object side of the first spacer.
4. The optical imaging lens according to claim 2, wherein the optical imaging lens satisfies: and (2) T12/CP1+f1/CT1 is less than or equal to 6.0 and less than 20.0, wherein CP1 is the maximum thickness of the first spacer, f1 is the effective focal length of the first lens, CT1 is the center thickness of the first lens on the optical axis, and T12 is the air interval between the first lens and the second lens on the optical axis.
5. The optical imaging lens according to claim 2, wherein the plurality of spacers further includes a second spacer which is located on an image side of the second lens and is in contact with an image side portion of the second lens,
the optical imaging lens satisfies: -6.0 < f 2/(d 2s-d1 m) < -3.5, where f2 is the effective focal length of the second lens, d1m is the inner diameter of the image side of the first spacer, and d2s is the inner diameter of the object side of the second spacer.
6. The optical imaging lens according to claim 5, wherein the optical imaging lens satisfies: 2.5 < D1m/R2+D2m/R4 < 4.5, wherein D1m is the outer diameter of the image side of the first spacer, D2m is the outer diameter of the image side of the second spacer, R2 is the radius of curvature of the image side of the first lens, and R4 is the radius of curvature of the image side of the second lens.
7. The optical imaging lens according to claim 5, wherein the optical imaging lens satisfies: 3.5 < (f1+f2)/EP 12 < 6.0, wherein f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, and EP12 is a separation distance in a direction along the optical axis from an image side of the first spacer to an object side of the second spacer.
8. The optical imaging lens according to claim 5, wherein the optical imaging lens satisfies: 1.5 < (D2 s-D2 s)/R3 < 3.0, wherein D2s is an outer diameter of the object side surface of the second spacer, D2s is an inner diameter of the object side surface of the second spacer, and R3 is a radius of curvature of the object side surface of the second lens.
9. The optical imaging lens according to claim 5, wherein the plurality of spacers further includes a third spacer which is located on an image side of the third lens and is in contact with an image side portion of the third lens,
the optical imaging lens satisfies: -2.0 < (r5+r6)/(D3 s-D3 s) < -0.66, wherein R5 is the radius of curvature of the object-side surface of the third lens, R6 is the half of curvature of the image-side surface of the third lens, D3s is the outer diameter of the object-side surface of the third spacer, and D3s is the inner diameter of the object-side surface of the third spacer.
10. The optical imaging lens according to claim 9, wherein the optical imaging lens satisfies: 13.5 < f3/EP23+ T34/CP3 < 17.5, wherein f3 is the effective focal length of the third lens, T34 is the air separation of the third lens and the fourth lens on the optical axis, CP3 is the maximum thickness of the third spacer, and EP23 is the separation distance in the direction along the optical axis from the image side of the second spacer to the object side of the third spacer.
11. The optical imaging lens according to any one of claims 1 to 10, wherein the optical imaging lens satisfies: 0 < (R8-R9)/(D4 s-D4 s) < 0.5, wherein R8 is a radius of curvature of an image side surface of the fourth lens, R9 is a radius of curvature of an object side surface of the fifth lens, D4s is an outer diameter of the object side surface of the fourth spacer, and D4s is an inner diameter of the object side surface of the fourth spacer.
12. The optical imaging lens according to any one of claims 1 to 10, wherein the optical imaging lens satisfies: 8.0 < f4/CT4+T45/CP4 < 11.0, wherein f4 is an effective focal length of the fourth lens, T45 is an air gap of the fourth lens and the fifth lens on the optical axis, CT4 is a center thickness of the fourth lens on the optical axis, and CP4 is a maximum thickness of the fourth spacer.
13. The optical imaging lens according to any one of claims 1 to 10, wherein the optical imaging lens satisfies: -12.5 < (r9+r10)/(D5 s-D4 m) < -8.5, wherein R9 is the radius of curvature of the object-side surface of the fifth lens, R10 is the radius of curvature of the image-side surface of the fifth lens, D5s is the outer diameter of the object-side surface of the fifth spacer, and D4m is the outer diameter of the image-side surface of the fourth spacer.
14. The optical imaging lens according to any one of claims 1 to 10, wherein the optical imaging lens satisfies: -6.5 < f 6/(d 6s-d5 s) < -1.0, wherein f6 is the effective focal length of the sixth lens, d5s is the inner diameter of the object side of the fifth spacer, and d6s is the inner diameter of the object side of the sixth spacer.
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