CN113514940B - Optical imaging lens and imaging apparatus - Google Patents

Optical imaging lens and imaging apparatus Download PDF

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CN113514940B
CN113514940B CN202111077373.5A CN202111077373A CN113514940B CN 113514940 B CN113514940 B CN 113514940B CN 202111077373 A CN202111077373 A CN 202111077373A CN 113514940 B CN113514940 B CN 113514940B
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lens
optical imaging
imaging lens
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image
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CN113514940A (en
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王昆
魏文哲
王克民
曾吉勇
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Jiangxi Lianchuang Electronic Co Ltd
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Jiangxi Lianchuang Electronic Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

The invention discloses an optical imaging lens and imaging equipment, the optical imaging lens comprises the following components in sequence from an object side to an imaging surface along an optical axis: a first lens having a focal power, an object-side surface of the first lens being a convex surface, and an image-side surface of the first lens being a concave surface; a second lens with negative focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens having a positive refractive power, both the object-side surface and the image-side surface of the third lens being convex; a fourth lens having a positive refractive power, an object-side surface of which is convex; the image side surface of the fifth lens is a concave surface, and the fourth lens and the fifth lens form a cemented lens; a sixth lens having a positive refractive power, an object-side surface of which is convex; a seventh lens having a negative refractive power, an object side surface of which is concave; and a diaphragm positioned between the first lens and the third lens; the optical imaging lens is provided with at least one aspheric lens. The optical imaging lens at least has the advantages of long focal length, large aperture and low distortion.

Description

Optical imaging lens and imaging apparatus
Technical Field
The present invention relates to the field of imaging lens technology, and in particular, to an optical imaging lens and an imaging device.
Background
With the development of automatic driving technology, ADAS (Advanced Driver assistance System) has become a standard configuration for many automobiles; the vehicle-mounted camera lens is used as a key device of the ADAS, can sense the road conditions around the vehicle in real time, realizes the functions of forward collision early warning, lane deviation warning, pedestrian detection and the like, and directly influences the safety coefficient of the ADAS due to the performance of the vehicle-mounted camera lens, so that the performance requirement on the vehicle-mounted camera lens is higher and higher.
The optical lens carried in the ADAS and applied to the front of the vehicle mainly identifies the front condition of the vehicle, and requires that obstacles can be clearly distinguished out of one hundred meters, so that collision early warning is realized. At present, vehicle-mounted lenses used for identifying targets in front of a vehicle are usually designed for close-range targets, the field angle of the lenses is relatively large, although the lenses can better image the close-range targets, the imaging effect on the far-range targets is poor, the identification accuracy rate of the middle-range and long-range targets cannot be considered, the effective target identification range is reduced, and the requirement of the vehicle on the front pre-aiming distance during running at a high speed is difficult to meet.
Disclosure of Invention
Therefore, the invention aims to provide an optical imaging lens and an imaging device, which have the advantages of at least long focal length, large aperture and low distortion, can provide high-definition imaging effect, are applied to a vehicle-mounted monitoring system, and can improve the imaging quality and the identification accuracy of a long-distance target.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides an optical imaging lens, comprising, in order from an object side to an imaging plane along an optical axis: the lens comprises a first lens with focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens is provided with negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens having a positive optical power, the third lens having convex object and image side surfaces; a fourth lens having a positive optical power, an object side surface of the fourth lens being convex; the image side surface of the fifth lens is a concave surface, and the fourth lens and the fifth lens form a cemented lens; a sixth lens having a positive optical power, an object side surface of the sixth lens being convex; a seventh lens having a negative optical power, an object side surface of the seventh lens being a concave surface; the diaphragm is positioned between the first lens and the second lens or between the second lens and the third lens; the optical imaging lens is provided with at least one aspheric lens.
In a second aspect, the present invention provides an imaging apparatus, including an imaging element and the optical imaging lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the optical imaging lens into an electrical signal.
Compared with the prior art, the optical imaging lens and the imaging equipment provided by the invention have the advantages that the lens has the advantages of high pixel, long focal length, large aperture and small distortion by adopting the seven lenses with specific shapes and focal powers, and can effectively correct the aberration of the marginal field of view, so that the resolution capability of the edge of the optical imaging lens is improved.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical imaging lens according to a first embodiment of the present invention;
FIG. 2 is a distortion curve diagram of an optical imaging lens according to a first embodiment of the present invention;
FIG. 3 is a vertical axis chromatic aberration diagram of the optical imaging lens according to the first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 5 is a distortion curve diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 6 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an optical imaging lens system according to a third embodiment of the present invention;
FIG. 8 is a distortion curve diagram of an optical imaging lens according to a third embodiment of the present invention;
FIG. 9 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a third embodiment of the present invention;
FIG. 10 is a schematic structural diagram of an optical imaging lens system according to a fourth embodiment of the present invention;
fig. 11 is a distortion graph of an optical imaging lens according to a fourth embodiment of the present invention;
FIG. 12 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a fourth embodiment of the present invention;
fig. 13 is a schematic configuration diagram of an image forming apparatus according to a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The invention provides an optical imaging lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis:
the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an optical filter and a diaphragm positioned between the first lens and the third lens.
The first lens has positive focal power or negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has positive focal power, and both the object side surface and the image side surface of the third lens are convex surfaces;
the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface;
the fifth lens has negative focal power, the image side surface of the fifth lens is a concave surface, and the fourth lens and the fifth lens form a cemented lens;
the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface;
the seventh lens has negative focal power, and the object side surface of the seventh lens is a concave surface.
The thermal stability of the glass lens is more stable, and in order to enable the lens to have better thermal stability, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all glass lenses. It should be noted that other combinations of lens materials that achieve the above effects are also possible. Meanwhile, in order to achieve a better imaging effect, the optical imaging lens at least comprises an aspheric lens.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
7＜TTL/BFL＜9；（1）
2.5＜TTL/D＜3；（2）
wherein, TTL represents the total optical length of the optical imaging lens, BFL represents the vertical distance from the image-side surface vertex of the seventh lens element to the imaging surface, and D represents the effective aperture of the optical imaging lens.
Satisfying the above conditional expressions (1) and (2), can reach longer focal length under the condition of properly controlling the length of the lens and restricting the effective aperture of the lens, and cooperate with a specific module and a high-pixel chip, so that the lens has longer visual field distance and good resolution capability.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
-3.5＜fL2/f＜-2；（3）
-4<(R3+R4)/(R3-R4)<-1.1；（4）
wherein f represents the focal length of the optical imaging lens, fL2Denotes a focal length of the second lens, R3 denotes a radius of curvature of an object-side surface of the second lens, and R4 denotes a radius of curvature of an image-side surface of the second lens.
Satisfying above-mentioned conditional expressions (3) and (4), can confirm that the second lens is negative focal power and the meniscus lens of bending to the image side basically, can effectively reduce the field curvature and the distortion of camera lens, make the camera lens possess higher resolving power, simultaneously, the second lens sets up behind the diaphragm, also can play the effect of diverging light.
In some embodiments, in order to reasonably limit the ability of the first lens to converge the light beam, the optical imaging lens satisfies the following conditional expression:
0.5＜f1/fL1+f3/fL2＜1；（5）
|R3/f3+R4/f4|＜0.01；（6）
where f1 denotes a focal length of the object side surface of the first lens, f3 denotes a focal length of the object side surface of the second lens, f4 denotes a focal length of the image side surface of the second lens, fL1Denotes the focal length of the first lens, fL2Denotes a focal length of the second lens, R3 denotes a radius of curvature of an object-side surface of the second lens, and R4 denotes a radius of curvature of an image-side surface of the second lens.
The conditional expression (5) is met, and the incident angle of incident light can be effectively reduced by reasonably setting the surface type focal lengths of the first lens and the second lens, so that the aperture of the front end of the lens is reduced, and the whole volume of the lens is further reduced; and meanwhile, the conditional expression (6) is satisfied, the sum of the curvature radius and the surface focal distance ratio of the object side surface and the image side surface of the second lens can be controlled to be close to zero, the correction of the aberration of the subsequent lens of the system is facilitated, and the integral image resolving capability of the lens is improved.
In some embodiments, in order to effectively control the distortion of the lens, the optical imaging lens satisfies the following conditional expression:
0.01rad/mm2＜θ/IH2＜0.02rad/mm2；（7）
wherein θ represents a half field angle (unit: radian) of the optical imaging lens, and IH represents a corresponding image height of the optical imaging lens at the half field angle.
Satisfying the above condition (7), can make imaging system possess negative distortion and distortion value control within-2.5%, show that the camera lens possesses bigger image height in marginal visual field, after the photograph of shooing is stretched, can make marginal visual field have better imaging.
In some embodiments, the fourth lens and the fifth lens constitute a cemented lens, and the fourth lens and the fifth lens satisfy the following conditional expressions:
-2<fL4/fL5<-1.2；（8）
0.2<CTL45/TTL<0.3（9）
wherein f isL4Denotes the focal length of the fourth lens, fL5Denotes the focal length, CT, of the fifth lensL45Indicating the center thickness of the cemented lensAnd TTL represents the total optical length of the optical imaging lens.
Satisfying above-mentioned conditional expression (8), can rationally control the focal length of the fourth lens of positive focal power and the fifth lens of negative focal power and account for than, can realize better achromatic effect, can effectively reduce the vertical axis chromatic aberration and the field curvature of marginal visual field simultaneously. Satisfying above-mentioned conditional expression (9), can rationally control cemented lens in the shared proportion in whole camera lens, make each lens thickness distribute evenly, convenient processing and equipment.
In some embodiments, the first lens satisfies the following conditional expression:
0.6＜ET1/CT1＜1.2；（10）
0.6mm＜DM1-DM2＜1.3mm；（11）
where ET1 denotes an edge thickness of the first lens, CT1 denotes a center thickness of the first lens, DM1 denotes an effective aperture of an object-side surface of the first lens, and DM2 denotes an effective aperture of an image-side surface of the first lens.
The first lens meets the conditional expressions (10) and (11), so that the shape of the first lens is very uniform, one-time die-casting molding is facilitated, and processing and manufacturing of the lens are facilitated; meanwhile, the aperture of the lens of the first lens is restrained, the aperture of a light beam is restrained, the incident angle of a main light ray is reduced, the tolerance influence caused by the first lens is effectively reduced, and the assembly yield is greatly improved.
In some embodiments, the seventh lens satisfies the following conditional expression:
1.2＜ET7/CT7＜2.4；（12）
-1.5<R12/f<-0.4；（13）
where ET7 denotes an edge thickness of the seventh lens, CT7 denotes a center thickness of the seventh lens, R12 denotes a radius of curvature of an object side surface of the seventh lens, and f denotes a focal length of the optical imaging lens.
The seventh lens can be made to be thin in the middle and thick at the edge by satisfying the conditional expression (12), and can have a larger image height under the condition of limited lens length; the seventh lens is a glass aspheric lens, so that aberrations such as spherical aberration, field curvature and distortion generated by the front lens can be effectively corrected by reasonably limiting the surface type of the seventh lens, and the imaging of the edge can be clearer.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
f/IH>3.7；（14）
f/D<1.5；（15）
wherein f represents the focal length of the optical imaging lens, IH represents the corresponding image height of the optical imaging lens in a half field of view, and D represents the effective aperture of the optical imaging lens.
Satisfying the above conditional expression (14), indicating that the lens has a long focal length characteristic; the light-transmitting aperture of the lens can be increased by meeting the conditional expression (15), so that the light transmission is increased, the image definition is improved, and the imaging effect of a large aperture is realized.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
1.0<fL3/f<1.5；（16）
-10<fL45/f<-2；（17）
0.5<fL6/f<1.5；（18）
-3<fL7/f<-0.5；（19）
wherein f isL3Denotes the focal length of the third lens, fL45Denotes the focal length of the cemented lens, fL6Denotes the focal length of the sixth lens, fL7Denotes a focal length of the seventh lens, and f denotes a focal length of the optical imaging lens.
The conditional expressions (16) - (19) are satisfied, the focal power ratio of each lens can be reasonably distributed, chromatic aberration among the lenses can be compensated mutually, chromatic aberration of the whole lens can be well corrected, and the whole imaging quality is improved.
Compared with spherical lenses, the aspherical lenses have better spherical aberration correction capability, and some non-curved lenses are adopted in the optical imaging lens in order to improve the imaging quality of the lens and realize the miniaturization of the lens volume.
Satisfying above-mentioned configuration and being favorable to guaranteeing optical imaging lens has high pixel, long focal length, big light ring, little distortion, effectively corrects the aberration of marginal field of view simultaneously to improved imaging lens marginal resolution ability to the camera lens comprises full glass lens, makes the camera lens possess good heat stability, under the circumstances of high low temperature, still possesses good imaging ability.
The invention is further illustrated below in the following examples. In each embodiment, the thickness, the curvature radius, and the material selection part of each lens in the optical imaging lens are different, and the specific difference can be referred to the parameter table of each embodiment. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
As an embodiment, when the lenses in the optical imaging lens are aspheric lenses, the aspheric surface shapes each satisfy the following equation:
Figure 519918DEST_PATH_IMAGE001
，
wherein z represents the distance in the optical axis direction from the curved surface vertex, c represents the curvature of the curved surface vertex, K represents the conic coefficient, h represents the distance from the optical axis to the curved surface, and B, C, D, E and F represent the fourth, sixth, eighth, tenth and twelfth order curved surface coefficients, respectively.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical imaging lens 100 according to a first embodiment of the present invention is shown, where the optical imaging lens 100 sequentially includes, from an object side to an image plane along an optical axis: the lens comprises a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.
The first lens element L1 has positive optical power, and has a convex object-side surface S1 and a concave image-side surface S2.
The second lens element L2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4.
The third lens L3 has positive optical power, and both the object-side surface S5 and the image-side surface S6 of the third lens are convex.
The fourth lens L4 has positive optical power, and both the object-side surface S7 and the image-side surface of the fourth lens are convex.
The fifth lens L5 has negative power, the object-side surface and the image-side surface S9 of the fifth lens are both concave, the fourth lens L4 and the fifth lens L5 are cemented into a cemented body, and the image-side surface of the fourth lens and the object-side surface of the fifth lens are cemented into a cemented surface S8.
The sixth lens element L6 has positive refractive power, and has a convex object-side surface S10 and a concave image-side surface S11.
The seventh lens L7 has negative power, the object side surface S12 of the seventh lens is concave, and the image side surface S13 of the seventh lens is concave at the paraxial region.
The first lens L1 and the seventh lens L7 are glass aspheric lenses, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all glass spherical lenses.
The relevant parameters of each lens in the optical imaging lens 100 provided in the first embodiment of the present invention are shown in table 1.
TABLE 1
Figure 380427DEST_PATH_IMAGE002
In this embodiment, the parameters of each lens aspheric surface of the optical imaging lens 100 are shown in table 2.
TABLE 2
Figure 844906DEST_PATH_IMAGE003
In the present embodiment, the distortion curve and the vertical axis chromatic aberration curve of the optical imaging lens 100 are shown in fig. 2 and 3, respectively.
Referring to fig. 2, it is shown a F-tan θ distortion diagram of the optical imaging lens 100 according to the first embodiment of the present invention, and it can be seen from the diagram that the F-tan θ distortion of the lens is negative and within-2%, and is negative, which indicates that the distortion of the optical imaging lens 100 is well corrected.
Referring to fig. 3, a vertical axis chromatic aberration diagram of the optical imaging lens 100 according to the first embodiment of the present invention is shown, and it can be seen from the diagram that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are controlled within ± 2 microns, which indicates that the vertical axis chromatic aberration of the optical imaging lens 100 is well corrected.
Second embodiment
Referring to fig. 4, a schematic structural diagram of an optical imaging lens 200 according to a second embodiment of the present invention is shown, in which the optical imaging lens 200 in the present embodiment is substantially the same as the optical imaging lens 100 in the first embodiment, except that the first lens L1 of the optical imaging lens 200 in the present embodiment is a negative power lens, the cemented surface of the cemented lens composed of the fourth lens L4 and the fifth lens L5 is close to a plane, the image side S13 of the seventh lens is a convex surface, and the curvature radius, material, thickness, and the like of each lens are different, and specific parameters related to each lens are shown in table 3.
TABLE 3
Figure 982627DEST_PATH_IMAGE004
The parameters of each lens aspheric surface of the optical imaging lens 200 of the present embodiment are shown in table 4.
TABLE 4
Figure 569466DEST_PATH_IMAGE005
Referring to fig. 5, it is shown a F-tan θ distortion diagram of an optical imaging lens 200 according to a second embodiment of the present invention, and it can be seen from the diagram that the F-tan θ distortion of the lens is negative and within-2%, and is negative, which indicates that the distortion of the optical imaging lens 200 is well corrected.
Referring to fig. 6, a vertical axis chromatic aberration diagram of the optical imaging lens 200 according to the second embodiment of the present invention is shown, and it can be seen from the diagram that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are controlled within ± 3 microns, which indicates that the vertical axis chromatic aberration of the optical imaging lens 200 is well corrected.
Third embodiment
Referring to fig. 7, a schematic structural diagram of an optical imaging lens 300 according to a third embodiment of the present invention is shown, in which the optical imaging lens 300 in the present embodiment is substantially the same as the optical imaging lens 100 in the first embodiment, except that an image-side surface S11 of a sixth lens L6 of the optical imaging lens 300 in the present embodiment is a convex surface, an image-side surface S13 of a seventh lens is a convex surface, and curvature radii, materials, thicknesses, and the like of other lenses are different.
The parameters related to the respective lenses of the optical imaging lens 300 provided in the present embodiment are shown in table 5.
TABLE 5
Figure 120533DEST_PATH_IMAGE006
The parameters of each lens aspheric surface of the optical imaging lens 300 of the present embodiment are shown in table 6.
TABLE 6
Figure 326386DEST_PATH_IMAGE007
Referring to fig. 8, it is shown a F-tan θ distortion diagram of an optical imaging lens 300 according to a third embodiment of the present invention, and it can be seen from the diagram that the F-tan θ distortion of the lens is negative and within-2.5%, and is negative, which indicates that the distortion of the optical imaging lens 300 is well corrected.
Referring to fig. 9, a vertical axis chromatic aberration diagram of the optical imaging lens 300 according to the third embodiment of the present invention is shown, and it can be seen from the diagram that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are controlled within ± 1.5 microns, which indicates that the vertical axis chromatic aberration of the optical imaging lens 300 is well corrected.
Fourth embodiment
Referring to fig. 10, a schematic structural diagram of an optical imaging lens 400 according to a fourth embodiment of the invention is shown. The optical imaging lens 400 in the present embodiment is substantially the same as the optical imaging lens 100 in the first embodiment, except that the stop ST of the optical imaging lens 400 in the present embodiment is located between the second lens L2 and the third lens L3, the image-side surface S13 of the seventh lens is a convex surface, and the curvature radius, material, thickness, etc. of each lens are different, and specific parameters of each lens are shown in table 7.
TABLE 7
Figure 443247DEST_PATH_IMAGE008
The parameters of each lens aspheric surface of the optical imaging lens 400 of the present embodiment are shown in table 8.
TABLE 8
Figure 341933DEST_PATH_IMAGE009
Referring to fig. 11, it is shown a F-tan θ distortion diagram of an optical imaging lens 400 according to a fourth embodiment of the present invention, and it can be seen from the diagram that the F-tan θ distortion of the lens is negative and within-2%, and is negative, which indicates that the distortion of the optical imaging lens 400 is well corrected.
Referring to fig. 12, a vertical axis chromatic aberration diagram of an optical imaging lens 400 according to a fourth embodiment of the present invention is shown, and it can be seen from the diagram that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are controlled within ± 2 microns, which indicates that the vertical axis chromatic aberration of the optical imaging lens 400 is well corrected.
Please refer to table 9, which shows the optical characteristics corresponding to the optical imaging lens provided in the above four embodiments, including the focal length F, total optical length TTL, maximum field angle FOV and F # of the optical imaging lens, and image height IH, and further including the corresponding values of each of the above conditional expressions.
TABLE 9
Figure 177033DEST_PATH_IMAGE010
In summary, in the optical imaging lens provided in the embodiment of the present invention, the first lens is used for collecting light, so as to reduce the incident angle of the incident light, which is beneficial to reducing the aperture and the overall volume of the front end of the lens, and is convenient for the imaging system to correct the subsequent aberration; the second lens is a meniscus lens which is bent towards the image space and is mainly used for correcting the distortion of the lens and smoothly diverging and injecting converged light rays, so that the tolerance is favorably reduced; the third lens is a biconvex positive focal power lens with the two-side vector height close, so that the aberration brought by the lens can be effectively reduced; the fourth lens and the fifth lens are matched to eliminate field curvature, wherein the fourth lens is made of a glass material with positive focal power, the fifth lens is made of a glass material with negative focal power, spherical aberration and vertical axis chromatic aberration are reduced, and the Abbe number difference value of the fourth lens and the fifth lens is larger than 20, so that secondary spectrum is corrected, and an imaging system can have a good imaging effect in a wider visible light range; the sixth lens is a positive focal power lens and is mainly used for contracting light rays and reducing spherical aberration and coma aberration brought by the lens; the seventh lens is a meniscus aspheric lens and is mainly used for correcting distortion and astigmatism and increasing optical back focus. Each lens is a glass lens, so that the lens has better thermal stability and mechanical strength, and is beneficial to working in an extreme environment.
Fifth embodiment
Referring to fig. 13, an imaging apparatus 500 according to a fifth embodiment of the present invention is shown, where the imaging apparatus 500 may include an imaging element 510 and an optical imaging lens (e.g., the optical imaging lens 100) in any of the embodiments described above. The imaging element 510 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 500 may be a vehicle-mounted image pickup device, a security monitor, a motion camera, or any other electronic device equipped with the optical imaging lens.
The imaging device 500 provided by the embodiment of the application includes the optical imaging lens 100, and since the optical imaging lens 100 has the advantages of long focal length, large aperture and low distortion, the imaging device 500 having the optical imaging lens 100 also has the advantages of long focal length, large aperture and low distortion.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (13)

1. An optical imaging lens, comprising seven lenses in sequence from an object side to an imaging surface along an optical axis:
the lens comprises a first lens with focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens is provided with negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
a third lens having a positive optical power, the third lens having convex object and image side surfaces;
a fourth lens having a positive optical power, an object side surface of the fourth lens being convex;
the image side surface of the fifth lens is a concave surface, and the fourth lens and the fifth lens form a cemented lens;
a sixth lens having a positive optical power, an object side surface of the sixth lens being convex;
a seventh lens having a negative optical power, an object side surface of the seventh lens being a concave surface; and
a diaphragm positioned between the first lens and the third lens;
the optical imaging lens is provided with at least one aspheric lens;
the optical imaging lens meets the following conditional expression:
0.01rad/mm2＜θ/IH2＜0.02rad/mm2；
wherein θ represents a half field angle of the optical imaging lens, and IH represents a corresponding image height of the optical imaging lens in the half field of view.
2. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
7＜TTL/BFL＜9；
2.5<TTL/D＜3；
wherein, TTL represents the total optical length of the optical imaging lens, BFL represents the vertical distance from the image-side surface vertex of the seventh lens element to the imaging surface, and D represents the effective aperture of the optical imaging lens.
3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
-3.5＜fL2/f＜-2；
-4<(R3+R4)/(R3-R4)<-1.1；
wherein f represents the focal length of the optical imaging lens, fL2Denotes a focal length of the second lens, R3 denotes a radius of curvature of an object-side surface of the second lens, and R4 denotes a radius of curvature of an image-side surface of the second lens.
4. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0.5＜f1/fL1+f3/fL2＜1；
|R3/f3+R4/f4|＜0.01；
wherein f1 denotes a focal length of an object side surface of the first lens, f3 denotes a focal length of an object side surface of the second lens, f4 denotes a focal length of an image side surface of the second lens, fL1Denotes the focal length of the first lens, fL2Denotes a focal length of the second lens, R3 denotes a radius of curvature of an object-side surface of the second lens, and R4 denotes a radius of curvature of an image-side surface of the second lens.
5. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
-2<fL4/fL5<-1.2；
0.2<CTL45/TTL<0.3；
wherein f isL4Denotes the focal length of the fourth lens, fL5Denotes the focal length, CT, of the fifth lensL45Represents the center thickness of the cemented lens, and TTL represents the total optical length of the optical imaging lens.
6. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0.6＜ET1/CT1＜1.2；
0.6mm＜DM1-DM2＜1.3mm；
wherein ET1 represents an edge thickness of the first lens, CT1 represents a center thickness of the first lens, DM1 represents an effective aperture of an object side surface of the first lens, and DM2 represents an effective aperture of an image side surface of the first lens.
7. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
1.2＜ET7/CT7＜2.4；
-1.5<R12/f<-0.4；
wherein ET7 denotes an edge thickness of the seventh lens, CT7 denotes a center thickness of the seventh lens, R12 denotes a radius of curvature of an object side surface of the seventh lens, and f denotes a focal length of the optical imaging lens.
8. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
f/IH>3.7；
f/D<1.5；
wherein f represents the focal length of the optical imaging lens, IH represents the corresponding image height of the optical imaging lens in a half field of view, and D represents the effective aperture of the optical imaging lens.
9. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
1.0<fL3/f<1.5；
-10<fL45/f<-2；
0.5<fL6/f<1.5；
-3<fL7/f<-0.5；
wherein f isL3Denotes the focal length of the third lens, fL45Denotes the focal length of the cemented lens, fL6Denotes a focal length, f, of the sixth lensL7Denotes a focal length of the seventh lens, fRepresents the focal length of the optical imaging lens.
10. The optical imaging lens according to claim 1, wherein the first lens and the seventh lens are glass aspheric lenses, and the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are glass spherical lenses.
11. The optical imaging lens of claim 1, wherein the image-side surface of the sixth lens element is concave, and the image-side surface of the seventh lens element is convex or concave at a paraxial region.
12. The optical imaging lens assembly as claimed in claim 1, wherein the image-side surface of the sixth lens element is convex, and the image-side surface of the seventh lens element is convex.
13. An imaging apparatus comprising the optical imaging lens according to any one of claims 1 to 12 and an imaging element for converting an optical image formed by the optical imaging lens into an electric signal.
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