CN115185067B - Optical imaging lens and imaging device - Google Patents
Optical imaging lens and imaging device Download PDFInfo
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- CN115185067B CN115185067B CN202211106406.9A CN202211106406A CN115185067B CN 115185067 B CN115185067 B CN 115185067B CN 202211106406 A CN202211106406 A CN 202211106406A CN 115185067 B CN115185067 B CN 115185067B
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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
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- 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, which sequentially comprise the following components from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; the image side surface of the second lens is a concave surface; a third lens having a negative refractive power, the object-side surface of which is concave; the fourth lens with positive focal power has a convex object-side surface and a convex image-side surface; a diaphragm; the fifth lens with positive focal power has a convex object-side surface and a convex image-side surface; the sixth lens with negative focal power has a concave object-side surface and a concave image-side surface; the object side surface and the image side surface of the seventh lens are convex surfaces; the object side surface of the eighth lens with positive focal power is a concave surface, and the image side surface of the eighth lens is a convex surface. The invention has at least the characteristics of large wide angle and high resolution.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical imaging lens and imaging equipment.
Background
The vehicle-mounted all-round system consists of four ultra-wide-angle cameras which are arranged on the front, the rear, the left and the right of a vehicle body and used for simultaneously acquiring images around the vehicle, and after image processing, the images can be finally spliced into a seamless 360-degree panoramic top view around the vehicle, so that a driver can observe road conditions around the vehicle according to the panoramic top view, and driving safety indexes are improved. Therefore, the vehicle-mounted all-round system greatly expands the sensing capability of a driver on the surrounding environment, so that the driver can feel unfortunate and relaxed when handling the conditions of vehicle starting, driving turning, parking in a place, meeting in a narrow road, obstacle avoidance and the like, and the occurrence of accidents such as scraping, even collision and rolling can be effectively reduced.
Because the vehicle-mounted panoramic system is applied to the complex outdoor environment, the requirement on the carried ultra-wide-angle camera is extremely high, the field angle is required to be large, and the vehicle-mounted panoramic system also needs to have good thermal stability so that the vehicle-mounted panoramic system can keep good resolving power under high and low temperature environments. Therefore, it is highly desirable to develop an in-vehicle camera having a large wide angle and a high resolution balance.
Disclosure of Invention
Based on this, an object of the present invention is to provide an optical imaging lens and an imaging apparatus having at least a large wide angle and a high resolving power.
The invention achieves 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 optical filter comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens and an optical filter; the first lens has negative focal power, and 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 image side surface of the second lens is a concave surface; the third lens has negative focal power, and the object side surface of the third lens is a concave 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 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 cemented lens group; the seventh lens has positive focal power, and the object side surface and the image side surface of the seventh lens are convex surfaces; the eighth lens element has positive focal power, and has a concave object-side surface and a convex image-side surface.
In a second aspect, the present invention further provides an imaging device, which includes 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 has the beneficial effects of good thermal stability, large wide angle and convenience in assembly while realizing good imaging quality through reasonable configuration of the lens surface types and reasonable collocation of focal power.
Drawings
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 schematic diagram of relative illumination of an optical imaging lens according to a first embodiment of the invention.
FIG. 3 is a schematic diagram of F-Theta distortion of an optical imaging lens according to a first embodiment of the present invention.
Fig. 4 is a schematic MTF diagram of an optical imaging lens according to a first embodiment of the disclosure.
Fig. 5 is a schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating relative illuminance of an optical imaging lens according to a second embodiment of the present invention.
FIG. 7 is a schematic diagram of F-Theta distortion of an optical imaging lens according to a second embodiment of the present invention.
Fig. 8 is a schematic MTF diagram of an optical imaging lens according to a second embodiment of the present disclosure.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Embodiments of the invention are given in the accompanying 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.
An embodiment of the present invention provides an optical imaging lens, which sequentially includes, from an object side to an image plane along an optical axis: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a filter.
The first lens has 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, and the image side surface of the second lens is a concave surface; the third lens has negative focal power, and the object side surface of the third lens is a concave surface; the fourth lens has positive focal power, and the object side surface and the image side surface of the fourth lens are convex surfaces; the diaphragm is arranged between the fourth lens and the fifth lens; 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 cemented lens group; the seventh lens has positive focal power, and the object side surface and the image side surface of the seventh lens are convex surfaces; the eighth lens element has a positive refractive power, and has a concave object-side surface and a convex image-side surface.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
0.02<TTL/IH/FOV<0.04； （1）
wherein, TTL represents the optical total length of the optical imaging lens, IH represents the half-image height of the optical imaging lens, and FOV represents the maximum field angle of the optical imaging lens. Satisfying above-mentioned conditional expression (1), can realize compressing the total length of camera lens when optical imaging lens image plane enlarges, realize the miniaturization of camera lens when promoting the camera lens resolution to carry on terminal equipment.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
0.5<f/IH<0.6； （2）
wherein f represents the effective focal length of the optical imaging lens, and IH represents the half-image height of the optical imaging lens. Satisfying above-mentioned conditional expression (2), showing that optical imaging lens has great image plane, can satisfy the formation of image demand of big target surface chip.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
f/ENPD<2.11； （3）
wherein f represents an effective focal length of the optical imaging lens, and ENPD represents an entrance pupil diameter of the optical imaging lens. Satisfying the above conditional expression (3), by placing the stop between the fourth lens and the fifth lens, the optical imaging lens can be made to have a larger aperture and have good imaging quality in a bright and dark environment.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
15.1°<(CRA) max <18.9°； （4）
wherein, (CRA) max And the maximum value of the incidence angle of the chief ray of the optical imaging lens in the full field of view on the image plane is represented. The CRA of the optical imaging lens can be matched with the CRA of the chip photosensitive element by meeting the conditional expression (4), and the photosensitive efficiency of the chip is improved.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
3.2<|R8|/R7<4.5； （5）
wherein R7 represents a radius of curvature of the object-side surface of the fourth lens, and R8 represents a radius of curvature of the image-side surface of the fourth lens. The relative positions of the pupil images of the ghost images secondarily reflected by the object side surface of the fourth lens and the image side surface of the fourth lens on the focal plane can be changed by satisfying the conditional expression (5), the pupil images of the ghost images can be far away from the focal plane by controlling the curvature radius, the relative energy value of the ghost images is effectively reduced, and the quality of the imaging picture of the lens is improved.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
1.65<BFL/f<1.75； （6）
wherein BFL represents the optical back focus of the optical imaging lens, and f represents the effective focal length of the optical imaging lens. The condition formula (6) is met, the optical back focal length is longer on the basis of realizing the miniaturization of the optical imaging lens, the assembly difficulty of the CRA and the optical imaging lens module is favorably reduced, the sensitivity of the lens to the MTF can be effectively reduced, the production yield is improved, and the production cost is reduced.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
0.05<(T 78 *BFL)/(T 78 +BFL)<0.07； （7）
wherein, T 78 And the air space of the seventh lens and the eighth lens on the optical axis is represented, and BFL represents the optical back focus of the optical imaging lens. Satisfy above-mentioned conditional expression (7), through reducing the air space of seventh lens and eighth lens on the optical axis, can be equivalent to a slice biconvex thick lens with seventh lens and eighth lens combination, be favorable to reducing the field curvature, promote the resolution quality, realize the miniaturization of camera lens, can increase the equipment yield of camera lens simultaneously.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
2.8<f 4 /f<3.0； （8）
6.1<TTL/CT4<6.7； （9）
wherein f is 4 The effective focal length of the fourth lens is represented, f is the effective focal length of the optical imaging lens, CT4 is the center thickness of the fourth lens, and TTL is the total optical length of the optical imaging lens. The optical imaging lens meets the conditional expressions (8) to (9), and the central thickness and the focal power of the fourth lens are reasonably controlled, so that the optical imaging lens is favorably reduced in aberration, and the field curvature of the lens is optimized.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
4.5<f 56 /f<5.0； （10）
wherein f is 56 Denotes a combined focal length of the fifth lens and the sixth lens, and f denotes an effective focal length of the optical imaging lens. The optical imaging lens system meets the conditional expression (10), so that a cemented lens group formed by combining the fifth lens and the sixth lens has proper positive focal power, the chromatic aberration of the optical imaging lens system is balanced, and the resolution quality of the optical imaging lens system is improved.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
6.2<TTL/CT5<7.0； （11）
16<TTL/CT6<22； （12）
wherein CT5 represents the central thickness of the fifth lens, CT6 represents the central thickness of the sixth lens, and TTL represents the total optical length of the optical imaging lens. Satisfying the above conditional expressions (11) to (12), it is advantageous to optimize curvature of field by increasing the center thickness of the fifth lens and the center thickness of the sixth lens.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
0.9<Vd5/Vd6<1.0； （13）
2.3<Nd5/Nd6<2.5； （14）
where Vd5 denotes an abbe number of the fifth lens, vd6 denotes an abbe number of the sixth lens, nd5 denotes a refractive index of the fifth lens, and Nd6 denotes a refractive index of the sixth lens. Satisfying the above conditional expressions (13) to (14), it is more advantageous to eliminate chromatic aberration by increasing the abbe number difference and the refractive index difference between the fifth lens and the sixth lens.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
1.4<f 1 /f 2 <1.7； （15）
wherein, f 1 Representing the effective focal length of the first lens, f 2 Representing the effective focal length of the second lens. The first lens and the second lens have appropriate negative focal power when the condition formula (15) is met, light can be smoothly transited, the field angle of the optical imaging lens is enlarged, the difficulty of correcting distortion and chromatic aberration of the rear end lens is reduced, and the image quality of the optical imaging lens is improved.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
-3.7<f 3 /f<-3.2； （16）
0.03<CT3/TTL<0.05； （17）
-0.8<(R5+R6)/(R5-R6)<-0.6； （18）
wherein f is 3 The effective focal length of the third lens is represented, f is the effective focal length of the optical imaging lens, CT3 is the central thickness of the third lens, TTL is the optical total length of the optical imaging lens, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens. Satisfy the above conditional expressions (16) to (18)The surface type and the focal power of the third lens are reasonably adjusted, so that the aberration of the optical imaging lens is favorably corrected, and the image quality of the optical imaging lens is improved.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
2.9<f 7 /f<3.4； （19）
2.4<R12/ f<2.6； （20）
-5.2<R13/ f<-3.4； （21）
wherein, f 7 Denotes an effective focal length of the seventh lens, f denotes an effective focal length of the optical imaging lens, R12 denotes a radius of curvature of an object-side surface of the seventh lens, and R13 denotes a radius of curvature of an image-side surface of the seventh lens. The surface type and focal power of the seventh lens are reasonably controlled to satisfy the conditional expressions (19) to (21), so that the spherical aberration, the coma aberration, the astigmatism and the field curvature of the optical imaging lens are balanced, and the image quality of the optical imaging lens is improved.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
Z 3 (h 3 )=0，h 3 ∈[-S3, S3]the number of real number solutions of (2) is greater than or equal to 3; (22)
Wherein, Z 3 (h 3 ) An aspheric surface equation, h, representing the object-side surface of the second lens 3 And S3 represents the effective semi-aperture of the object side surface of the second lens. The condition formula (22) is satisfied, the surface shape reverse curvature can be increased by increasing the number of zero point solutions of the aspheric surface shape equation, the surface shape reverse curvature is beneficial to correcting the phenomenon of image plane bending, and the purpose of uniform full-field imaging quality is achieved.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
-26°<|ϕ12|-arctan[S12/(R12 2 -S12 2 ) 1/2 ] <26°； （23）
-22°<|ϕ13|-arctan[S13/(R13 2 -S13 2 ) 1/2 ] <22°； （24）
wherein \ 98112 represents a face center angle of an object-side surface of the seventh lens at an effective half aperture, \ 98113 represents a face center angle of an image-side surface of the seventh lens at an effective half aperture, S12 represents an effective half aperture of the object-side surface of the seventh lens, S13 represents an effective half aperture of the image-side surface of the seventh lens, R12 represents a radius of curvature of the object-side surface of the seventh lens, and R13 represents a radius of curvature of the image-side surface of the seventh lens. The conditional expressions (23) to (24) are satisfied, so that the variation trend of focal power from the center to the edge of the seventh lens is closer to a cosine function, and the defocusing curves of all the fields are more gathered when the temperature changes, which is beneficial to improving the temperature performance of the lens.
-0.5<f 1 /(R1+R2)<-0.4； （25）
Wherein f is 1 Represents an effective focal length of the first lens, R1 represents a radius of curvature of an object-side surface of the first lens, and R2 represents a radius of curvature of an image-side surface of the first lens. The optical imaging lens meets the conditional expression (25), and by reasonably constraining the surface type of the object side surface and the image side surface of the first lens, the bending degree of light rays at the image side surface of the first lens is favorably reduced, the astigmatism amount of the optical imaging lens is reduced, the optical imaging lens is ensured to have a larger field angle and small distortion, and the imaging quality is improved.
In some embodiments, the first lens and the fourth lens are glass spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are plastic aspheric lenses. By adopting a plurality of plastic aspheric lenses, the production cost can be reduced to a great extent, and meanwhile, excellent imaging quality can be ensured.
The aspheric surface shapes of the optical imaging lens in the embodiment of the invention all satisfy the following equation:
wherein z represents the distance between the curved surface and the vertex of the curved surface in the optical axis direction, C represents the curvature of the vertex of the curved surface, K represents a quadric coefficient, h represents the distance between the optical axis and the curved surface, and B, C, D, E and F respectively represent the curved surface coefficients of fourth order, sixth order, eighth order, tenth order and twelfth order.
The present application is further illustrated in the following examples. In each of the following embodiments, the thickness and the radius of curvature of each lens in the optical imaging lens are different, and specific differences can be referred to in the parameter tables in the embodiments. The following examples are only preferred embodiments of the present application, but the embodiments of the present application are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative point of the present application should be construed as being equivalent substitutions and are included in the scope of the present application.
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 S18 along an optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9.
Specifically, the first lens element L1 has a negative refractive power, and the object-side surface S1 is a convex surface and the image-side surface S2 is a concave surface; the second lens element L2 has a negative power, and has a concave object-side surface S3 at the paraxial region and a concave image-side surface S4; the third lens L3 has negative focal power, and the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface; the fourth lens L4 has positive focal power, and both the object-side surface S7 and the image-side surface S8 are convex surfaces; the stop ST is disposed between the fourth lens L4 and the fifth lens L5; the fifth lens L5 has positive focal power, and both the object-side surface S9 and the image-side surface are convex surfaces; the sixth lens L6 has negative focal power, the object side surface and the image side surface S11 of the sixth lens are both concave surfaces, the fifth lens L5 and the sixth lens L6 form a cemented lens group, and the cemented surface of the cemented lens group is S10; the seventh lens element L7 has positive focal power, and both the object-side surface S12 and the image-side surface S13 are convex surfaces; the eighth lens element L8 has positive refractive power, and has a concave object-side surface S14 and a convex image-side surface S15; the object side surface of the filter L9 is S16, and the image side surface is S17; the first lens L1 and the fourth lens L4 are glass spherical lenses, and the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are plastic aspheric lenses.
Please refer to table 1, which shows the related parameters of each lens of the optical imaging lens system 100 according to the first embodiment of the present invention.
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
Referring to fig. 2, fig. 3 and fig. 4, a relative illumination curve, an F-Theta distortion curve and an MTF curve of the optical imaging lens in the present embodiment are shown, respectively.
The relative illuminance curve of fig. 2 represents the relative illuminance values for different field angles on the imaging plane. In fig. 2, the horizontal axis represents the angle of view (unit: degree) and the vertical axis represents the relative contrast value (normalized value, maximum scale value of 1.0). As can be seen from fig. 2, the relative contrast values in the 90% field are all greater than 0.6, indicating that the optical imaging lens has good light transmission performance.
The F-Theta distortion curve of fig. 3 represents F-Theta distortion values for different field angles on the imaging plane. In FIG. 3, the horizontal axis represents the F-Theta distortion value (unit:%), and the vertical axis represents the half field angle (unit: degree). It can be seen from fig. 3 that the F-Theta distortion value within the full field angle is controlled within ± 5%, which indicates that the relationship between the image height and the field angle of the optical imaging lens is approximately linearly changed, and the image frame ratio is more real.
The MTF curves of fig. 4 represent paraxial MTFs for different spatial frequencies. In fig. 4, the horizontal axis represents spatial frequency (unit: line pair/mm), and the vertical axis represents MTF values. As can be seen from fig. 4, the paraxial MTF value at the maximum spatial frequency is still 0.6 or more, which indicates that the paraxial aberration of the optical imaging lens 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 present invention is shown, where the optical imaging lens 200 in this embodiment is substantially the same as the optical imaging lens 100 in the first embodiment, but the difference is that curvature radius, material, thickness, etc. of each lens are different, and specific parameters of each lens are shown in table 3.
TABLE 3
In this embodiment, the parameters of each lens aspheric surface of the optical imaging lens 200 are shown in table 4.
TABLE 4
Referring to fig. 6, fig. 7 and fig. 8, a graph of relative illumination, an F-Theta distortion graph and an MTF graph of the optical imaging lens in the present embodiment are respectively shown. As can be seen from fig. 6, the relative contrast values in the 90% field are all greater than 0.6, indicating that the optical imaging lens has good light transmission performance. As can be seen from fig. 7, the F-Theta distortion value within the full field angle is controlled within ± 5%, which indicates that the relationship between the image height and the field angle of the optical imaging lens is approximately linearly changed, and the image frame ratio is more real. As can be seen from fig. 8, the paraxial MTF value at the maximum spatial frequency is still 0.6 or more, which indicates that the paraxial aberration of the optical imaging lens is well corrected.
Tables 5 and 6 show the corresponding optical characteristics in the above two embodiments, including the effective focal length F, total optical length TTL, field angle FOV, F # and half image height IH of the system, the focal length of each lens, and the corresponding values for each of the aforementioned conditions.
TABLE 5
TABLE 6
In summary, the optical imaging lens provided by the invention adopts two glass lenses and six plastic aspheric lenses, and through reasonable configuration of the surface types of the lenses and reasonable collocation of focal power, the lens has the beneficial effects of good thermal stability, large wide angle, convenience in assembly and the like while realizing good imaging quality, and by using a plurality of plastic lenses, the production cost can be reduced to a great extent, and meanwhile, good imaging quality is ensured.
Third embodiment
The present embodiment provides an imaging apparatus, which includes the optical imaging lens (for example, the optical imaging lens 100) in any of the above embodiments, and an imaging element, where the imaging element is disposed outside the imaging surface S18, and the imaging element converts an optical image formed by the optical imaging lens 100 into an electrical signal.
Further, the imaging element may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device provided by the embodiment comprises the optical imaging lens, and various aberrations of the imaging system are better corrected by adopting a mode of combining a glass spherical surface and a plastic aspheric surface, so that the imaging device provided by the embodiment has the characteristics of large wide angle, miniaturization, high resolving power and the like.
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 will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and the embodiments of the present invention may be changed or modified in any form without departing from the principles, and thus, fall within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (11)
1. An optical imaging lens, comprising eight lenses, in order from an object side to an image plane along an optical axis, comprising:
the lens comprises a first lens with negative 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 with negative focal power, the image side surface of the second lens is a concave surface;
a third lens having a negative optical power, an object side surface of the third lens being a concave surface;
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;
a diaphragm;
a fifth lens having positive optical power, the fifth lens having both an object-side surface and an image-side surface which are convex;
the fifth lens and the sixth lens form a cemented lens group;
a seventh lens having a positive optical power, the seventh lens having convex object and image side surfaces;
the lens system comprises an eighth lens with positive focal power, wherein the object-side surface of the eighth lens is a concave surface, and the image-side surface of the eighth lens is a convex surface.
2. The optical imaging lens of claim 1, wherein the first lens and the fourth lens are spherical glass lenses, and the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are aspheric plastic lenses.
3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0.02<TTL/IH/FOV<0.04；
wherein, TTL represents the optical total length of the optical imaging lens, IH represents the half-image height of the optical imaging lens, and FOV represents the maximum field angle of the optical imaging lens.
4. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies the following conditional expression:
0.5<f/IH<0.6；
wherein f represents the effective focal length of the optical imaging lens, and IH represents the half-image height of the optical imaging lens.
5. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies the following conditional expression:
3.2<|R8|/R7<4.5；
wherein R7 represents a radius of curvature of the object-side surface of the fourth lens, and R8 represents a radius of curvature of the image-side surface of the fourth lens.
6. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
1.65<BFL/f<1.75；
wherein BFL represents the optical back focus of the optical imaging lens, and f represents the effective focal length of the optical imaging lens.
7. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies the following conditional expression:
4.5<f 56 /f<5.0；
wherein, f 56 Denotes a combined focal length of the fifth lens and the sixth lens, and f denotes an effective focal length of the optical imaging lens.
8. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies the following conditional expression:
1.4<f 1 /f 2 <1.7；
wherein f is 1 Denotes an effective focal length of the first lens, f 2 Representing the effective focal length of the second lens.
9. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
-3.7<f 3 /f<-3.2；
0.03<CT3/TTL<0.05；
-0.8<(R5+R6)/(R5-R6)<-0.6；
wherein, f 3 The effective focal length of the third lens is represented, f is the effective focal length of the optical imaging lens, CT3 is the central thickness of the third lens, TTL is the optical total length of the optical imaging lens, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.
10. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies the following conditional expression:
2.9<f 7 /f<3.4；
2.4<R12/f<2.6；
-5.2<R13/f<-3.4；
wherein f is 7 F table representing effective focal length of the seventh lensAnd the effective focal length of the optical imaging lens is shown, R12 represents the curvature radius of the object side surface of the seventh lens, and R13 represents the curvature radius of the image side surface of the seventh lens.
11. An image forming apparatus characterized in that: an optical imaging lens according to any one of claims 1 to 10, comprising an imaging element for converting an optical image formed by the optical imaging lens into an electrical signal.
Priority Applications (1)
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| CN115494624B (en) * | 2022-11-16 | 2023-04-07 | 江西联创电子有限公司 | Optical lens |
| CN116661110B (en) * | 2023-08-02 | 2023-11-07 | 江西欧菲光学有限公司 | Optical lens, camera module and terminal equipment |
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