CN113156621B - Optical imaging lens and imaging apparatus - Google Patents
Optical imaging lens and imaging apparatus Download PDFInfo
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- CN113156621B CN113156621B CN202110488005.3A CN202110488005A CN113156621B CN 113156621 B CN113156621 B CN 113156621B CN 202110488005 A CN202110488005 A CN 202110488005A CN 113156621 B CN113156621 B CN 113156621B
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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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
- 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
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Abstract
The invention discloses an optical imaging lens and imaging equipment, wherein the optical imaging lens consists of seven lenses, and the optical imaging lens sequentially comprises the following components from an object side to an imaging surface along an optical axis: the first lens with positive focal power, its object side is a convex surface, the image side is a concave surface; a second lens having a negative optical power, both the object-side surface and the image-side surface of which are concave; a third lens having a positive refractive power, an object-side surface of which is convex; a diaphragm; a fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex; a fifth lens element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex; a sixth lens element having a negative refractive power, wherein both the object-side surface and the image-side surface are concave; a seventh lens element with positive refractive power having a convex object-side surface and a concave image-side surface; wherein, the seven lenses are all glass lenses. The optical imaging lens has the advantages of high pixel, long focal length and small distortion.
Description
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 optical imaging lens and the imaging device provided by the invention have the advantages of small angle, long focal length and low distortion, can provide a 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, which is composed of seven lenses, and the optical imaging lens sequentially includes, from an object side to an imaging surface along an optical axis: the lens comprises a first lens with positive 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; a second lens having a negative optical power, the second lens having concave object and image side surfaces; a third lens having a positive optical power, an object side surface of the third lens being convex; a diaphragm; the fourth lens is provided with positive focal power, and the object side surface and the image side surface of the fourth lens are convex surfaces; the lens comprises a fifth lens with positive focal power, wherein both the object-side surface and the image-side surface of the fifth lens are convex surfaces; a sixth lens element having a negative optical power, the sixth lens element having a concave object-side surface and a concave image-side surface; the lens comprises a seventh lens with positive focal power, wherein the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface; the optical filter is arranged between the seventh lens and the imaging surface; wherein 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.
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 provided by the invention adopts seven lenses with specific shapes and refractive powers, so that the lens has the advantages of high pixel, long focal length and small distortion, and can effectively correct the aberration of the marginal field of view, thereby improving the resolution capability of the edge of the optical imaging lens.
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 in a first embodiment of the present invention;
fig. 2 is a distortion graph of an optical imaging lens in a first embodiment of the present invention;
FIG. 3 is a graph illustrating an axial chromatic aberration of an optical imaging lens according to a first embodiment of the present invention;
FIG. 4 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an optical imaging lens system according to a second embodiment of the present invention;
FIG. 6 is a distortion curve diagram of an optical imaging lens in a second embodiment of the present invention;
FIG. 7 is a graph of axial chromatic aberration of an optical imaging lens according to a second embodiment of the present invention;
FIG. 8 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an optical imaging lens system according to a third embodiment of the present invention;
fig. 10 is a distortion graph of an optical imaging lens in a third embodiment of the present invention;
FIG. 11 is a graph showing axial chromatic aberration of an optical imaging lens according to a third embodiment of the present invention;
FIG. 12 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a third embodiment of the present invention;
fig. 13 is a schematic structural view of an image forming apparatus according to a fourth 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 consists of seven lenses, and the optical imaging lens 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 diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter.
The first lens has positive 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, and the object side surface and the image side surface of the second lens are both concave surfaces;
the third lens has positive focal power, and the object side surface of the third lens is a convex surface;
the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces;
the fifth lens has positive focal power, and both the object side surface and the image side surface of the fifth lens are convex surfaces;
the sixth lens has negative focal power, the object side surface and the image side surface of the sixth lens are both concave surfaces, and the fifth lens and the sixth lens form a bonding body;
the seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface.
The glass lens has more stable thermal stability, 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. Of course, other combinations of lens materials are possible to achieve the described effect.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
6.5＜TTL/BFL＜8；（1）
TTL/D＜4.5；（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), the long focal length can be achieved under the condition of properly lengthening the length of the lens and restraining the effective aperture of the lens, and better cooperation with a specific module and a high-pixel chip is realized, so that the lens has good resolution capability.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
2.0＜fL1/f＜4.5；（3）
-0.9＜fL2/f＜-0.5；（4）
3＜fL3/f＜4.5；（5）
0.8＜fL4/f＜1；（6）
1.45＜fL5/f＜1.70；（7）
-0.8＜fL6/f＜-0.5；（8）
1.8＜fL7/f＜2.2；（9）
wherein f denotes a focal length of the optical imaging lens, fL1Denotes the focal length of the first lens, fL2Denotes the focal length of the second lens, fL3Denotes the focal length of the third lens, fL4Denotes the focal length of the fourth lens, fL5Denotes the focal length of the fifth lens, fL6Denotes the focal length of the sixth lens, fL7To representThe focal length of the seventh lens.
The combination of the focal lengths and the surface shapes of the seven lenses can be basically limited by satisfying the conditional expressions (3) to (9), so that the effect of the long focus of the lens can be realized, and meanwhile, the aberration of the lens can be effectively reduced, so that the lens has higher resolving power.
In some embodiments, in order to reasonably limit the ability of the first and second lenses to converge the light beams, the optical imaging lens satisfies the following conditional expression:
2.5＜|f1/fL1+f3/fL2|＜6.5；（10）
R3/f3+R4/f4＜0.01；（11）
wherein f is1Denotes the focal length of the object side of the first lens, f3Denotes the focal length of the object side of the second lens, f4Denotes the focal length of the image side of the second lens, fL1Denotes the focal length of the first lens, fL2Denotes the focal length, R, of the second lens3Denotes the radius of curvature, R, of the object-side surface of the second lens4The radius of curvature of the image-side surface of the second lens is indicated.
The conditional expressions (10) and (11) are satisfied, so that the incident angle of incident light can be effectively reduced, and the volume of the rear end of the lens is reduced; the first lens is a convex lens, and the second lens is a concave lens, so that the distortion of the whole optical system can be greatly reduced; when the conditional expression (10) is satisfied, the sum of the curvature radius and the focal length ratio of the object plane and the image plane of the second lens is controlled to be close to zero, so that the correction of the subsequent lens aberration of the system is facilitated.
In some embodiments, in order to effectively control the distortion of the lens, the optical imaging lens satisfies the following conditional expression:
θ/IH2＜0.02rad/mm2；（12）
where θ represents a half angle of view (unit: radian) of the optical imaging lens, and IH represents an image height corresponding to the optical imaging lens at the half angle of view θ.
Satisfying the above conditional expression (12), the imaging system can have negative distortion and be controlled within-2%, which indicates that the lens has larger image height in the edge field, and the edge field can have better imaging effect after the taken photo is stretched.
In some embodiments, the fifth lens and the sixth lens constitute a cemented lens group, and the fifth lens and the sixth lens satisfy the following conditional expressions:
0.3＜|R10/fL56|＜0.5；（13）
Vd5-Vd6＜40；（14）
wherein R is10Radius of curvature of cemented surface of cemented lens group, fL56Denotes the focal length of the cemented lens group, Vd5Abbe number, Vd, of the fifth lens6The abbe number of the sixth lens is shown.
The chromatic aberration of the lens can be effectively corrected by satisfying the conditional expressions (13) and (14), and the curvature radius of the adhesive surface of the adhesive body consisting of the fifth lens and the sixth lens is controlled, so that the chromatic aberration of magnification of the marginal field of view can be effectively reduced.
In some embodiments, the sixth lens satisfies the following conditional expression:
2.2＜ET6/CT6＜3.8；（15）
-2.2＜R10/R11＜-1.1；（16）
1.2＜d10/d11＜1.4；（17）
wherein, ET6Denotes the edge thickness, CT, of the sixth lens6Denotes the center thickness, R, of the sixth lens10Radius of curvature, R, of cemented surface of cemented lens group11Denotes a radius of curvature of an image-side surface of the sixth lens element, d10Represents the effective aperture of the object side surface of the sixth lens, d11The effective aperture of the image-side surface of the sixth lens is shown.
Satisfying the above conditional expressions (15) to (17), the sixth lens can be made in the shape of a concave lens to achieve the gluing with the fifth lens, reducing chromatic aberration; meanwhile, the aperture of the lens of the sixth lens is restricted, the aperture of a light beam is also restricted, the incident angle of a main light ray is reduced, and imaging of a rear system is facilitated.
In some embodiments, the seventh lens satisfies the following conditional expression:
0.72＜ET7/CT7＜0.82；（18）
0.33＜R12/R13＜0.42；（19）
1.1＜d12/d13＜1.2；（20）
wherein, ET7Denotes the edge thickness, CT, of the seventh lens7Denotes the center thickness, R, of the seventh lens12Denotes a radius of curvature, R, of an object side surface of the seventh lens13Denotes a radius of curvature of an image side surface of the seventh lens, d12Represents the effective aperture of the object side surface of the seventh lens, d13The effective aperture of the image-side surface of the seventh lens is shown.
Satisfying the above conditional expressions (18) to (20), the seventh lens can be made to be a meniscus structure which does not cause large aberration by itself and which appropriately restricts the ratio of the edge thickness and the center thickness thereof, making it easy to process. Meanwhile, 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, and imaging at the edge can be clearer.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
10mm<f<16mm；（21）
25°<FOV<45°；（22）
where f denotes a focal length of the optical imaging lens, and FOV denotes a maximum angle of view of the optical imaging lens. Satisfying the above conditional expressions (21) and (22) indicates that the lens has the characteristics of long focal length and small viewing angle, and can realize high-definition imaging at a longer distance.
Compared with spherical lenses, the aspheric lenses have better spherical aberration correction capability, and some aspheric 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.
The optical imaging lens has the advantages that the optical imaging lens is ensured to have high pixels, long focal length and small distortion, meanwhile, the aberration of the marginal field of view is effectively corrected, so that the peripheral resolving power of the imaging lens is improved, and the lens is composed of all-glass lenses, so that the optical imaging lens has good thermal stability and still has good imaging capability under the condition of low temperature and high temperature.
The aspheric surface shape of the optical imaging lens meets the following equation:
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.
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.
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 second lens L2, a third lens L3, a diaphragm ST, 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 L2 has negative power, and both the object-side surface S3 and the image-side surface S4 of the second lens are concave.
The third lens L3 has positive refractive power, and has a convex object-side surface S5 and a concave image-side surface S6.
The fourth lens L4 has positive optical power, and both the object-side surface S7 and the image-side surface S8 of the fourth lens are convex.
The fifth lens L5 has positive optical power, and both the object-side surface S9 and the image-side surface of the fifth lens are convex.
The sixth lens L6 has negative power, the object-side surface and the image-side surface S11 of the sixth lens are both concave, the fifth lens L5 and the sixth lens L6 are cemented into a cemented body, and the image-side surface of the fifth lens and the object-side surface of the sixth lens are cemented into a cemented surface S10.
The seventh lens L7 has positive power, and the object-side surface S12 of the seventh lens is convex and the image-side surface S13 is concave.
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
In this embodiment, the parameters of each lens aspheric surface of the optical imaging lens 100 are shown in table 2.
TABLE 2
In the present embodiment, graphs of distortion, axial chromatic aberration, and vertical axis chromatic aberration of the optical imaging lens 100 are shown in fig. 2, 3, and 4, 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 greater than-1%, and is a negative distortion, which indicates that the distortion of the optical imaging lens 100 is well corrected.
Referring to fig. 3, a graph of axial chromatic aberration of the optical imaging lens 100 according to the first embodiment of the present invention is shown, and it can be seen from the graph that the offset of chromatic aberration is controlled within ± 0.02 mm, which illustrates that the optical imaging lens 100 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Referring to fig. 4, a vertical axis chromatic aberration curve 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 ± 3 microns, which indicates that the vertical axis chromatic aberration of the optical imaging lens 100 is well corrected.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical imaging lens 200 according to a second embodiment of the invention is shown. 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 third lens L3 and the fourth lens L4 of the optical imaging lens 200 in the present embodiment are closer to each other, and the curvature radius and material selection of each lens are different.
The parameters related to each lens of the optical imaging lens 200 provided in the present embodiment are shown in table 3.
TABLE 3
The parameters of each lens aspheric surface of the optical imaging lens 200 of the present embodiment are shown in table 4.
TABLE 4
Referring to fig. 6, 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 a negative value and is greater than-1%, and is a negative distortion, which indicates that the distortion of the optical imaging lens 200 is well corrected.
Referring to fig. 7, a graph of axial chromatic aberration of the optical imaging lens 200 according to the second embodiment of the present invention is shown, and it can be seen from the graph that the offset of the chromatic aberration is controlled within ± 0.02 mm, which illustrates that the optical imaging lens 200 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Referring to fig. 8, a vertical axis chromatic aberration curve 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 ± 2.5 microns, which indicates that the vertical axis chromatic aberration of the optical imaging lens 200 is well corrected.
Third embodiment
Referring to fig. 9, a structure diagram of an optical imaging lens 300 according to the present embodiment is shown. 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 the image-side surface of the third lens L3 of the optical imaging lens 300 in the present embodiment is a convex surface, and the curvature radius and material selection of each lens 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
The parameters of each lens aspheric surface of the optical imaging lens 300 of the present embodiment are shown in table 6.
TABLE 6
Referring to fig. 10, 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 greater than-2%, and is a negative distortion, which indicates that the distortion of the optical imaging lens 300 is well corrected.
Referring to fig. 11, a graph of axial chromatic aberration of the optical imaging lens 300 according to the third embodiment of the present invention is shown, and it can be seen from the graph that the offset of chromatic aberration is controlled within ± 0.04 mm, which illustrates that the optical imaging lens 300 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Referring to fig. 12, it can be seen that the vertical axis chromatic aberration of the optical imaging lens 300 according to the third embodiment of the present invention is controlled within ± 3.5 microns, which indicates that the vertical axis chromatic aberration of the optical imaging lens 300 is well corrected.
Please refer to table 7, which shows the optical characteristics corresponding to the optical imaging lens provided in the above three embodiments, including the focal length F, the total optical length TTL, the field angle FOV and the F # of the lens, and also including the related values corresponding to each of the above conditional expressions.
TABLE 7
In summary, the first lens and the second lens are used for collecting light rays, so that the incident angle of the incident light rays is reduced, the lens volume is reduced, and the subsequent correction of the imaging system on aberration is facilitated; the second lens is a biconcave spherical lens and is mainly used for correcting the distortion of the first lens and enabling converged light rays to enter smoothly, so that tolerance is reduced; the third lens is a positive lens with the two-side vector height being close, so that the aberration caused by the lens can be effectively reduced; the fourth lens is a biconvex aspheric lens and is mainly used for correcting spherical aberration and coma aberration brought by the front lens group of the diaphragm; the fifth lens and the sixth lens are matched for eliminating field curvature, wherein the fifth lens has positive focal power and uses a high-refractive-index glass material, the sixth lens has negative focal power and uses a low-refractive-index glass material, the reduction of spherical aberration and lateral chromatic aberration is facilitated, the chromatic dispersion of the relative part of the sixth lens and the seventh lens deviates from an Abbe empirical formula greatly, the correction of a secondary spectrum is facilitated, and an imaging system can have a good imaging effect in a wide visible light range; 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.
Fourth embodiment
Referring to fig. 13, an imaging device 400 according to a fourth embodiment of the present invention is shown, where the imaging device 400 may include an imaging element 410 and an optical imaging lens (e.g., the optical imaging lens 100) in any of the embodiments described above. The imaging element 410 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 400 may be a vehicle-mounted camera, a mobile phone, a tablet computer, or any other electronic device equipped with the optical imaging lens.
The imaging device 400 provided by the embodiment of the application comprises the optical imaging lens 100, and because the optical imaging lens 100 has the advantages of high pixel, long focal length and small distortion, the aberration of the marginal field of view can be effectively corrected, and the imaging device 400 with the optical imaging lens 100 also has the advantages of high pixel, long focal length and small distortion, and meanwhile, the aberration of the marginal field of view can be effectively corrected.
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 (10)
1. An optical imaging lens is composed of seven lenses, and is characterized in that the optical imaging lens sequentially comprises the following components from an object side to an imaging surface along an optical axis:
the lens comprises a first lens with positive 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;
a second lens having a negative optical power, the second lens having concave object and image side surfaces;
a third lens having a positive optical power, an object side surface of the third lens being convex;
a diaphragm;
the fourth lens is provided with positive focal power, and the object side surface and the image side surface of the fourth lens are convex surfaces;
the lens comprises a fifth lens with positive focal power, wherein both the object-side surface and the image-side surface of the fifth lens are convex surfaces;
a sixth lens element having a negative optical power, the sixth lens element having a concave object-side surface and a concave image-side surface;
the lens comprises a seventh lens with positive focal power, wherein the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface;
wherein 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;
the optical imaging lens meets the following conditional expression:
10mm<f<16mm；
25°<FOV<45°；
wherein f represents a focal length of the optical imaging lens, and FOV represents a maximum field angle of the optical imaging lens.
2. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
6.5＜TTL/BFL＜8；
TTL/D＜4.5；
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:
2.0＜fL1/f＜4.5；
-0.9＜fL2/f＜-0.5；
3＜fL3/f＜4.5；
0.8＜fL4/f＜1；
1.45＜fL5/f＜1.70；
-0.8＜fL6/f＜-0.5；
1.8＜fL7/f＜2.2；
wherein f represents the focal length of the optical imaging lens, fL1Denotes the focal length of the first lens, fL2Denotes the focal length of the second lens, fL3Denotes the focal length of the third lens, fL4Denotes the focal length of the fourth lens, fL5Denotes a focal length of the fifth lens, fL6Denotes a focal length, f, of the sixth lensL7Denotes a focal length of the seventh lens.
4. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
2.5＜|f1/fL1+f3/fL2|＜6.5；
R3/f3+R4/f4＜0.01；
wherein f is1Denotes the focal length of the object side of the first lens, f3Denotes the focal length of the object side of the second lens, f4Representing the focal length of the image side of the second lens, fL1Denotes the focal length of the first lens, fL2Denotes the focal length, R, of the second lens3Represents a radius of curvature, R, of an object-side surface of the second lens4Represents 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:
θ/IH2＜0.02rad/mm2；
wherein θ represents a half field angle of the optical imaging lens, and IH represents an image height corresponding to the optical imaging lens at the half field angle θ.
6. The optical imaging lens according to claim 1, wherein the fifth lens and the sixth lens constitute a cemented lens group, and the optical imaging lens satisfies the following conditional expression:
0.3＜|R10/fL56|＜0.5；
Vd5-Vd6＜40；
wherein R is10Represents a radius of curvature of a cemented surface of the cemented lens group, fL56Denotes a focal length, Vd, of the cemented lens group5Denotes an Abbe number, Vd, of the fifth lens6Represents an abbe number of the sixth lens.
7. The optical imaging lens according to claim 1, wherein the fifth lens and the sixth lens constitute a cemented lens group, and the optical imaging lens satisfies the following conditional expression:
2.2＜ET6/CT6＜3.8；
-2.2＜R10/R11＜-1.1；
1.2＜d10/d11＜1.4；
wherein, ET6Representing the edge thickness, CT, of the sixth lens6Represents the center thickness, R, of the sixth lens10Represents a radius of curvature, R, of a cemented surface of the cemented lens group11Represents a radius of curvature of an image-side surface of the sixth lens element, d10Represents an effective aperture of an object side surface of the sixth lens, d11And an effective aperture of an image side surface of the sixth lens.
8. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0.72＜ET7/CT7＜0.82；
0.33＜R12/R13＜0.42；
1.1＜d12/d13＜1.2；
wherein, ET7Representing the edge thickness, CT, of the seventh lens7Represents the center thickness, R, of the seventh lens12Represents a radius of curvature, R, of an object side surface of the seventh lens13Represents a radius of curvature of an image side surface of the seventh lens, d12Represents an effective aperture of an object side surface of the seventh lens, d13And an effective aperture of an image side surface of the seventh lens.
9. The optical imaging lens of claim 1, wherein the fourth lens and the seventh lens are both aspheric lenses, and the first lens, the second lens, the third lens, the fifth lens and the sixth lens are all spherical lenses.
10. An imaging apparatus comprising the optical imaging lens according to any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical imaging lens into an electric signal.
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| CN202110488005.3A CN113156621B (en) | 2021-05-06 | 2021-05-06 | Optical imaging lens and imaging apparatus |
| PCT/CN2022/090997 WO2022233304A1 (en) | 2021-05-06 | 2022-05-05 | Optical imaging lens and imaging device |
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| TWI663424B (en) * | 2018-08-23 | 2019-06-21 | 大立光電股份有限公司 | Photographing lens system, imaging apparatus and electronic device |
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