CN111308673A - Wide-angle lens, camera module and electronic device - Google Patents
Wide-angle lens, camera module and electronic device Download PDFInfo
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- CN111308673A CN111308673A CN202010120953.7A CN202010120953A CN111308673A CN 111308673 A CN111308673 A CN 111308673A CN 202010120953 A CN202010120953 A CN 202010120953A CN 111308673 A CN111308673 A CN 111308673A
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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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Abstract
The application discloses wide-angle lens, camera module and electron device. The wide-angle lens includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The first lens element with negative refractive power has a concave image-side surface; the second lens element with positive refractive power has a convex object-side surface; the third lens element with positive refractive power has a convex image-side surface; the fourth lens element with negative refractive power has a concave object-side surface; the fifth lens element with positive refractive power has a convex image-side surface; the sixth lens element with negative refractive power; the wide-angle lens satisfies the following conditions: -4< f6/f < -3. The wide-angle lens, the camera module and the electronic device in the embodiment of the application are beneficial to the wide-angle lens to realize a larger field angle and correct various aberrations and chromatic aberration such as distortion and the like by reasonably configuring the shape and the positive and negative refractive power of each lens, so that the resolution of an image shot by the wide-angle lens is improved, and the imaging quality of the wide-angle lens is improved.
Description
Technical Field
The present disclosure relates to imaging technologies, and particularly to a wide-angle lens, a camera module and an electronic device.
Background
A wide-angle lens is a lens having a large Field of view (FOV). Due to the wide field of view, the wide-angle lens can shoot a wide scene in a narrow space. The wide-angle lens has another characteristic of large depth of field, and is easy to make both the near view and the far view clear. However, the wide-angle lens has a large field angle, which easily causes a large lens distortion, generally greater than 20%, so that the edge of a photographed object is deformed, i.e., the aberration is large, and meanwhile, the chromatic aberration is also large, the resolving power is low, and the imaging quality of the wide-angle lens is poor.
Disclosure of Invention
The embodiment of the application provides a wide-angle lens, a camera module and an electronic device.
The wide-angle lens provided in this embodiment includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The first lens element with negative refractive power has a concave image-side surface; the second lens element with positive refractive power has a convex object-side surface; the third lens element with positive refractive power has a convex image-side surface; the fourth lens element with negative refractive power has a concave object-side surface; the fifth lens element with positive refractive power has a convex image-side surface; the sixth lens element has negative refractive power. The wide-angle lens meets the following conditions: -4< f6/f < -3. Wherein f6 is an effective focal length of the sixth lens element, and f is an effective focal length of the wide-angle lens.
The camera module that this application embodiment provided includes image sensor and wide-angle lens. The image sensor is arranged on the image side of the wide-angle lens. The wide-angle lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along the optical axis in sequence. The first lens element with negative refractive power has a concave image-side surface; the second lens element with positive refractive power has a convex object-side surface; the third lens element with positive refractive power has a convex image-side surface; the fourth lens element with negative refractive power has a concave object-side surface; the fifth lens element with positive refractive power has a convex image-side surface; the sixth lens element has negative refractive power. The wide-angle lens meets the following conditions: -4< f6/f < -3. Wherein f6 is an effective focal length of the sixth lens element, and f is an effective focal length of the wide-angle lens.
The electronic device provided by the embodiment of the application comprises a camera module and a shell. The camera module is mounted on the housing. The camera module comprises an image sensor and a wide-angle lens. The image sensor is arranged on the image side of the wide-angle lens. The wide-angle lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along the optical axis in sequence. The first lens element with negative refractive power has a concave image-side surface; the second lens element with positive refractive power has a convex object-side surface; the third lens element with positive refractive power has a convex image-side surface; the fourth lens element with negative refractive power has a concave object-side surface; the fifth lens element with positive refractive power has a convex image-side surface; the sixth lens element has negative refractive power. The wide-angle lens meets the following conditions: -4< f6/f < -3. Wherein f6 is an effective focal length of the sixth lens element, and f is an effective focal length of the wide-angle lens.
In the wide-angle lens, the camera module and the electronic device in the embodiment of the application, the wide-angle lens is in a set range through reasonably configuring the shape and the positive and negative refractive power of each lens, and the ratio of the effective focal length of the sixth lens to the effective focal length of the wide-angle lens is set, so that the wide-angle lens can correct various aberrations and chromatic aberrations such as distortion while realizing a larger field angle, the resolution of an image shot by the wide-angle lens is improved, and the imaging quality of the wide-angle lens is improved.
Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application 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 electronic device according to some embodiments of the present application;
FIG. 2 is a schematic view of a camera module according to some embodiments of the present disclosure;
FIG. 3 is a schematic view of a camera module according to some embodiments of the present disclosure;
FIG. 4 is a schematic diagram illustrating vertical axis chromatic aberration of a wide-angle lens according to a first embodiment of the present application;
FIG. 5 is a schematic view of field curvature and distortion of a wide-angle lens according to a first embodiment of the present application;
fig. 6 is a schematic diagram of relative illuminance of a wide-angle lens according to a first embodiment of the present application;
FIG. 7 is a schematic diagram of the optical modulation transfer function of a wide-angle lens of the first embodiment of the present application;
FIG. 8 is a schematic diagram illustrating vertical axis chromatic aberration of a wide-angle lens according to a second embodiment of the present application;
FIG. 9 is a schematic view of field curvature and distortion of a wide-angle lens according to a second embodiment of the present application;
FIG. 10 is a diagram illustrating relative illumination of a wide-angle lens according to a second embodiment of the present application;
fig. 11 is a schematic diagram of an optical modulation transfer function of a wide-angle lens according to a second embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the application. In order to simplify the disclosure of the embodiments of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application.
Referring to fig. 1, an electronic device 2000 according to an embodiment of the present disclosure includes a camera module 1000 and a housing 200. The electronic device 2000 may be a mobile phone, a tablet computer, a notebook computer, a game machine, a smart watch, a smart bracelet, a head display device, an unmanned aerial vehicle, a Digital Still Camera (DSC), a Digital video recorder (DVC), a driving recorder, and other monitoring devices, and other electronic devices having a Camera or a camcorder. In the embodiment of the present application, the electronic device 2000 is a mobile phone as an example, and it is understood that the specific form of the electronic device 2000 is not limited to the mobile phone.
The camera module 1000 is combined with the housing 200. The chassis 200 may be used to mount the camera module 1000, or the chassis 200 may serve as a mounting carrier of the camera module 1000. The chassis 200 may support, connect, protect, etc. the camera module 1000. The chassis 200 may also be used to mount functional modules of the electronic device 2000, such as a power supply module, an imaging module, and a communication module, so that the chassis 200 provides protection for the functional modules, such as dust prevention, drop prevention, and water prevention. The material of the casing 200 may be plastic, metal, glass, etc., and is not limited herein.
Referring to fig. 2, a camera module 1000 according to an embodiment of the present disclosure includes an image sensor 402 and a wide-angle lens 300.
The image sensor 402 is located at the end of the optical path. The light is imaged and converged on the surface of the image sensor 402 through the wide-angle lens 300, and the image sensor 402 converts the converged light into an electrical signal for imaging. The image sensor 402 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled Device (CCD) image sensor. The image sensor 402 may be a visible light image sensor or an infrared image sensor. A filter 401 may be placed in front of the image sensor 402. The filter 401 may be an IR pass filter, an IR cut filter, or the like, and different types of filters may be used according to actual applications. For example, when the camera module 1000 employs an IR pass filter and the image sensor 402 is an infrared image sensor, only infrared light is allowed to pass through the filter 401 to the image sensor 402, and the camera module 1000 acquires an infrared image, which can be used for iris recognition, or for acquiring depth information as a structured light image for structured light distance measurement, or for 3D modeling together with a visible light image, or for binocular distance measurement, etc. When the camera module 1000 employs an IR cut filter and the image sensor 402 is a visible light image sensor, infrared light is not allowed to pass through the filter 401, but visible light is allowed to pass through the filter 401 and reach the image sensor 402, and the camera module 1000 acquires a visible light image, which can be used as a general shooting requirement.
Referring to fig. 2, the wide-angle lens 300 of the present embodiment includes, in order from an object side to an image side, a first lens element 301, a second lens element 302, a third lens element 303, a fourth lens element 304, a fifth lens element 305, and a sixth lens element 306. The first lens element 301 with negative refractive power has a concave image-side surface S2; the second lens element 302 with positive refractive power has a convex object-side surface S3 of the second lens element 302; the third lens element 303 with positive refractive power has a convex image-side surface S7 of the third lens element 303; the fourth lens element 304 with negative refractive power has a concave object-side surface S8 of the fourth lens element 304; the fifth lens element 305 with positive refractive power has a convex image-side surface S11; the sixth lens element 306 with negative refractive power. The wide-angle lens 300 satisfies the following conditions: -4< f6/f < -3; where f6 is the effective focal length of sixth lens element 306, and f is the effective focal length of wide-angle lens 300. That is, f6/f can be any value greater than-4 and less than-3. For example, f6/f can be-3.9, -3.8, -3.7, -3.6, -3.5, -3.4, -3.3, -3.2, -3.1, etc.
In the wide-angle lens 300, the camera module 1000, and the electronic device 2000 of the embodiment of the application, the wide-angle lens 300 is configured by reasonably configuring the shape and the positive and negative refractive powers of each lens, and the ratio of the effective focal length of the sixth lens 306 to the effective focal length of the wide-angle lens 300 is set within a set range, so that the wide-angle lens 300 can correct various aberrations and chromatic aberrations such as distortion while realizing a larger field angle, and the resolution of an image shot by the wide-angle lens 300 is improved, thereby improving the imaging quality of the wide-angle lens 300.
Note that in this embodiment mode, the object side surface of the lens refers to a surface of the lens close to the object side, and the image side surface of the lens refers to a surface of the lens close to the image side (the same applies below). The effective focal length refers to the distance from the optical center of the lens to the focal point of the light collection when parallel light enters the first lens 301, the second lens 302, the third lens 303, the fourth lens 304, the fifth lens 305 and the sixth lens 306 (or enters the wide-angle lens 300), and is a measure for the light collection or divergence in the optical system.
In some embodiments, wide-angle lens 300 may satisfy any one or more of the following conditions:
-2.2<f1/f<-1.2；
1.5<f2/f<2.5；
0.5<f3/f<1.5；
-2.2< f4/f < -1.2; and
0.7<f5/f<1.7；
where f is an effective focal length of the wide-angle lens 300, f1 is an effective focal length of the first lens element 301, f2 is an effective focal length of the second lens element 302, f3 is an effective focal length of the third lens element 303, f4 is an effective focal length of the fourth lens element 304, and f5 is an effective focal length of the fifth lens element 305.
That is, f1/f can be any value greater than-2.2 and less than-1.2. For example, f1/f can be-2.1, -2.0, -1.9, -1.8, -1.7, -1.6, -1.5, -1.4, -1.3, and the like. f2/f can be any value greater than 1.5 and less than 2.5. For example, f2/f can be 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, etc. f3/f can be any value greater than 0.5 and less than 1.5. For example, f3/f can be 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, etc. f4/f can be any value greater than-2.2 and less than-1.2. For example, f4/f can be-2.1, -2.0, -1.9, -1.8, -1.7, -1.6, -1.5, -1.4, -1.3, and the like. f5/f can be any value greater than 0.7 and less than 1.7. For example, f5/f can be 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, and the like.
The lens configuration meeting the above conditions is beneficial for the wide-angle lens 300 to further correct various aberrations such as distortion and chromatic aberration, and improves the resolution of the image shot by the wide-angle lens 300, thereby further improving the imaging quality of the wide-angle lens 300.
In some embodiments, wide-angle lens 300 may satisfy any one or more of the following conditions:
6<R1/R2<7；
0.3<R3/R4<1.3；
-5.2<R5/R6<-4.2；
-7.7<R7/R8<-6.7；
16.5< R9/R10< 19; and
1<R11/R12<2；
where R1 is a radius of curvature of the object-side surface S1 of the first lens 301, R2 is a radius of curvature of the image-side surface S2 of the first lens 301, R3 is a radius of curvature of the object-side surface S3 of the second lens 302, R4 is a radius of curvature of the image-side surface S4 of the second lens 302, R5 is a radius of curvature of the object-side surface S6 of the third lens 303, R6 is a radius of curvature of the image-side surface S7 of the third lens 303, R7 is a radius of curvature of the object-side surface S8 of the fourth lens 304, R8 is a radius of curvature of the image-side surface S9 of the fourth lens 304, R9 is a radius of curvature of the object-side surface S10 of the fifth lens 305, R10 is a radius of curvature of the image-side surface S11 of the fifth lens 305, R11 is a radius of curvature of the object-side surface S12 of the sixth lens 306, and R12 is a radius of curvature of the image-side surface.
That is, R1/R2 can be any value greater than 6 and less than 7. For example, R1/R2 can be 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, and the like. R3/R4 can be any value greater than 0.3 and less than 1.3. For example, R3/R4 can be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, and the like. R5/R6 can be any value greater than-5.2 and less than-4.2. For example, R5/R6 can be-5.1, -5.0, -4.9, -4.8, -4.7, -4.6, -4.5, -4.4, -4.3, and the like. R7/R8 can be any value greater than-7.7 and less than-6.7. For example, R7/R8 can be-7.6, -7.5, -7.4, -7.3, -7.2, -7.1, -7.0, -6.8, and the like. R9/R10 can be any value greater than 16.5 and less than 19. For example, R9/R10 can be 16.6, 16.8, 17.0, 17.2, 17.4, 17.6, 17.8, 18.0, 18.2, 18.4, 18.6, 18.8, 18.9, and the like. R11/R12 can be any value greater than 1 and less than 2. For example, R11/R12 can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, and the like.
The lens configuration meeting the above conditions is beneficial for the wide-angle lens 300 to further correct various aberrations such as distortion and chromatic aberration, improve the resolving power of the image shot by the wide-angle lens 300, and is beneficial for improving the relative illumination at the edge of the lens imaging, thereby further improving the imaging quality of the wide-angle lens 300.
Referring to fig. 3, in some embodiments, the wide-angle lens 300 further includes an aperture 310, and the aperture 310 may be disposed between the second lens 302 and the third lens 303, which may facilitate the symmetrical layout of the front and the rear portions of the wide-angle lens 300, thereby facilitating the correction of the aberration of the wide-angle lens 300. Symmetrical layout, i.e. as shown in fig. 3, the shape and orientation of the first lens 301 before the aperture 310 and the fourth lens 304 after the aperture 310 are symmetrical; the shape and orientation of the second lens 302 before the stop 310 and the third lens 303 after the stop 310 are symmetrical.
The wide-angle lens 300 has a large field angle, which tends to cause the lens of the wide-angle lens 300 close to the object side, especially the first lens, to have a large aperture and to be curved inward greatly, thereby affecting the size and overall aesthetics of the wide-angle lens 300 and related products. The symmetrical layout enables the shapes, positions and orientations of the lenses in front of and behind the diaphragm 310 to be symmetrically distributed, so that the overall aperture of each lens is uniformly distributed, and the size miniaturization and overall aesthetic degree improvement of the wide-angle lens 300 and related products thereof in the embodiment of the application are facilitated.
In one example, when the stop 310 is disposed between the second lens 302 and the third lens 303, the stop 310 may be disposed on the image-side surface S2 of the first lens 301, or between the image-side surface S2 of the first lens 301 and the object-side surface S6 of the third lens 303, or on the object-side surface S6 of the third lens 303.
Referring to fig. 3, in some embodiments, the wide-angle lens 300 may further satisfy the following condition: 0.9< D1/D2< 1.1; where D1 is the aperture of the object-side surface S1 of the first lens element 301, and D2 is the aperture of the image-side surface S13 of the sixth lens element 306.
That is, D1/D2 may be any value greater than 0.9 and less than 1.1. For example, D1/D2 can be 0.91, 0.93, 0.95, 0.97, 0.99, 1.01, 1.03, 1.05, 1.07, 1.09, and the like.
Satisfying 0.9< D1/D2<1.1 is more advantageous for size miniaturization and overall aesthetic enhancement of the wide-angle lens 300 and the related products thereof according to the embodiments of the present application.
Referring to fig. 2, in some embodiments, the first lens 301, the second lens 302, the third lens 303, the fourth lens 304, the fifth lens 305, and the sixth lens 306 of the wide-angle lens 300 may all be aspheric lenses. Because the aspheric lens has a plurality of surface equation variables, the wide-angle lens 300 is beneficial to having more optimization schemes in the design, thereby being beneficial to correcting the aberration of the wide-angle lens 300. Meanwhile, the processing technology of the aspheric lens is mature, and the large-scale production of the aspheric lens in the wide-angle lens 300 is facilitated.
In some embodiments, the aspheric lens is an even-order aspheric lens, and the surface form equation of the even-order aspheric lens is as follows:
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric coefficient.
This embodiment uses even aspheric lens as the lens of wide-angle lens 300 in this application embodiment, is favorable to the camera lens to obtain better optimization scheme in the design to be favorable to correcting wide-angle lens 300's aberration more.
In some embodiments, the first lens 301, the second lens 302, the third lens 303, the fourth lens 304, the fifth lens 305, and the sixth lens 306 in the wide-angle lens 300 may be made of plastic, which is beneficial to reducing the weight of the wide-angle lens 300, reducing the production cost of the wide-angle lens 300, and facilitating mass production of the wide-angle lens 300.
In some embodiments, the field angle of the wide-angle lens 300 is greater than 100 degrees, so that a wide scene can be shot in a narrow space, and the wide-angle lens 300 can be widely applied to various occasions, such as shooting, detection, artificial intelligence and the like, which can effectively exert the advantage of the wide field angle. For example, the wide-angle lens 300 has a field angle of 110 degrees, 120 degrees, 130 degrees, 140 degrees, 150 degrees, and the like.
In the following embodiments, the thickness, the radius of curvature, the material selection, and the like of each lens in the wide-angle lens 300 are partially different, and specific differences can be referred to the parameter tables of the following embodiments.
First embodiment of the present application
Referring to fig. 1 and table 1, the first lens element 301 of the wide-angle lens element 300 has negative refractive power, and the image-side surface S2 of the first lens element 301 is concave; the second lens element 302 with positive refractive power has a convex object-side surface S3 of the second lens element 302; the third lens element 303 with positive refractive power has a convex image-side surface S7 of the third lens element 303; the fourth lens element 304 with negative refractive power has a concave object-side surface S8 of the fourth lens element 304; the fifth lens element 305 with positive refractive power has a convex image-side surface S11; and a sixth lens element 306, the sixth lens element 306 having negative refractive power.
The wide-angle lens 300 satisfies the following conditions: -4< f6/f < -3; where f6 is the effective focal length of sixth lens element 306, and f is the effective focal length of wide-angle lens 300.
The relevant parameters of the respective surfaces of the respective lenses in the wide-angle lens 300 in the first embodiment are shown in table 1.
TABLE 1
The aspherical coefficients of the respective surfaces of the respective lenses in the wide-angle lens 300 in the first embodiment are shown in table 2.
TABLE 2
Fig. 4 shows a vertical axis chromatic aberration graph of the wide-angle lens 300 in the first embodiment, since the smaller the data range of the image point, the smaller the vertical axis chromatic aberration of the lens, which represents the better the performance of the lens. As can be seen from fig. 4, the vertical axis chromatic aberration of the wide-angle lens 300 is small, which indicates that the color reduction degree of the image formed by the wide-angle lens 300 is high, i.e. the chromatic aberration in the first embodiment can be well corrected.
As can be seen from fig. 5, a light beam with a wavelength of 0.555 μm passes through the wide-angle lens 300 of the first embodiment, and the distortion in the meridional (tagential) direction and the Sagittal (Sagittal) direction is between-0.025 mm and 0.040 mm. A beam of light having a wavelength of 0.555 μm is distorted by 0% to 12% through the wide-angle lens 300 of the first embodiment, and the maximum distortion is less than 15%. That is, in the first embodiment, the distortion of the wide-angle lens 300 can be corrected well, and the image restoration degree of the image is high.
As can be seen from fig. 6, after a light beam with a wavelength range of 0555 μm passes through wide-angle lens 300 of the first embodiment, the relative illumination of 2.37mm at the maximum image plane is better than 0.5, and wide-angle lens 300 has better optical performance.
As can be seen from fig. 7, the wide-angle lens 300 of the first embodiment has a field height of 0.0mm, 0.23mm, 0.45mm, 0.68mm, 0.91mm, 1.14mm, 1.36mm, 1.59mm, 1.82mm, 2.04mm, 2.27mm, 2.37mm, a spatial frequency of 0lp/mm to 167lp/mm, a modulation conversion function value of 0.12 to 1.0, and a modulation conversion function value of better than 0.4 at 100lp/mm in the imaging range for light rays with a wavelength ranging from 0.436 μm to 0.656 μm in the meridian (tagential) direction and the Sagittal (Sagittal) direction, respectively, i.e., the wide-angle lens 300 has a better resolution.
The wide-angle lens 300 of the first embodiment has fov ° of 120 °, F number of 2.0, half-image height of 2.27mm, maximum imaging circle radius of 2.37mm, and effective focal length F of 2 mm. The chromatic aberration and distortion of the wide-angle lens 300 of the first embodiment can be effectively corrected, and the lens resolution and the relative illumination at the maximum image plane can also meet the requirements, so that the wide-angle lens 300 of the first embodiment has higher imaging quality.
Second embodiment of the present application
Referring to fig. 1 and table 3, the first lens element 301 of the wide-angle lens element 300 has negative refractive power, and the image-side surface S2 of the first lens element 301 is concave; the second lens element 302 with positive refractive power has a convex object-side surface S3 of the second lens element 302; the third lens element 303 with positive refractive power has a convex image-side surface S7 of the third lens element 303; the fourth lens element 304 with negative refractive power has a concave object-side surface S8 of the fourth lens element 304; the fifth lens element 305 with positive refractive power has a convex image-side surface S11; and a sixth lens element 306, the sixth lens element 306 having negative refractive power.
The wide-angle lens 300 satisfies the following conditions: -4< f6/f < -3; where f6 is the effective focal length of sixth lens element 306, and f is the effective focal length of wide-angle lens 300.
The relevant parameters of the respective surfaces of the respective lenses in the wide-angle lens 300 in the second embodiment are shown in table 3.
TABLE 3
The aspherical coefficients of the respective surfaces of the respective lenses in the wide-angle lens 300 in the second embodiment are shown in table 4.
TABLE 4
Fig. 8 shows a vertical axis chromatic aberration graph of the wide-angle lens 300 in the second embodiment, since the smaller the data range of the image point, the smaller the vertical axis chromatic aberration of the lens, which represents the better the performance of the lens. As can be seen from fig. 8, the vertical axis chromatic aberration of the wide-angle lens 300 is small, which indicates that the color reduction degree of the image formed by the wide-angle lens 300 is high, i.e. the chromatic aberration in the second embodiment can be well corrected.
As can be seen from FIG. 9, a light beam with a wavelength of 0.555 μm passes through the wide-angle lens 300 of the second embodiment, and the distortion in the meridional (Tangential) direction and the Sagittal (Sagittal) direction is between-0.035 mm and 0.028 mm. A beam of light having a wavelength of 0.555 μm is distorted by the wide-angle lens 300 of the second embodiment by 0% to 18%, and the maximum distortion is less than 20%. That is, in the second embodiment, the distortion of the wide-angle lens 300 can be corrected well, and the image restoration degree is high.
The relative illumination at the imaging edge of wide-angle lens 300 (i.e., near 2.37 mm) will typically be low. As can be seen from fig. 10, after a light beam with a wavelength range of 0555 μm passes through the wide-angle lens 300 of the second embodiment, the relative illumination at the maximum image plane of 2.37mm is close to 0.5, and the wide-angle lens 300 has better optical performance.
As can be seen from fig. 11, the wide-angle lens 300 of the second embodiment has a field height of 0.0mm, 0.23mm, 0.45mm, 0.68mm, 0.91mm, 1.14mm, 1.36mm, 1.59mm, 1.82mm, 2.04mm, 2.27mm, 2.37mm, a spatial frequency of 0lp/mm to 167lp/mm, a modulation conversion function value of 0.20 to 1.00, and a modulation conversion function value of better than 0.4 at 100lp/mm in the imaging range for light rays with a wavelength ranging from 0.436 μm to 0.656 μm in the meridian (tagential) direction and the Sagittal (Sagittal) direction, respectively, i.e., the wide-angle lens 300 has a better resolution.
The wide-angle lens 300 of the second embodiment is fov at 120 °, F number at 2.0, half-image height at 2.27mm, maximum imaging circle radius at 2.37mm, and effective focal length F at 2 mm. The chromatic aberration and distortion of the wide-angle lens 300 of the second embodiment can be effectively corrected, and the lens resolution and the relative illumination at the maximum image plane can also meet the requirements, so that the wide-angle lens 300 of the second embodiment has higher imaging quality.
To sum up, in the wide-angle lens 300, the camera module 1000 and the electronic device 2000 of the embodiment of the present application, the wide-angle lens 300 is in the setting range through the shape and the positive and negative refractive power of each lens of reasonable configuration, and the ratio of the effective focal length of the sixth lens 306 to the effective focal length of the wide-angle lens 300 is set, which is beneficial to the wide-angle lens 300 to realize a larger field angle, and meanwhile, various aberrations and chromatic aberration such as distortion can be corrected, and the resolution of the image shot by the wide-angle lens 300 is improved, thereby improving the imaging quality of the wide-angle lens 300, and ensuring the miniaturization of the wide-angle lens 300.
In the description herein, reference to the description of the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like means 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 application. In this specification, schematic representations of the above terms 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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present application, which is defined by the claims and their equivalents.
Claims (10)
1. A wide-angle lens comprising, in order from an object side to an image side along an optical axis:
the first lens element with negative refractive power has a concave image-side surface;
a second lens element with positive refractive power having a convex object-side surface;
a third lens element with positive refractive power having a convex image-side surface;
a fourth lens element with negative refractive power having a concave object-side surface;
a fifth lens element with positive refractive power having a convex image-side surface; and
a sixth lens element with negative refractive power;
the wide-angle lens meets the following conditions:
-4<f6/f<-3；
wherein f6 is an effective focal length of the sixth lens element, and f is an effective focal length of the wide-angle lens.
2. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies any one or more of the following conditions:
-2.2<f1/f<-1.2；
1.5<f2/f<2.5；
0.5<f3/f<1.5；
-2.2< f4/f < -1.2; and
0.7<f5/f<1.7；
wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.
3. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies any one or more of the following conditions:
6<R1/R2<7；
0.3<R3/R4<1.3；
-5.2<R5/R6<-4.2；
-7.7<R7/R8<-6.7；
16.5< R9/R10< 19; and
1<R11/R12<2；
wherein R1 is a radius of curvature of an object-side surface of the first lens element, R2 is a radius of curvature of an image-side surface of the first lens element, R3 is a radius of curvature of an object-side surface of the second lens element, R4 is a radius of curvature of an image-side surface of the second lens element, R5 is a radius of curvature of an object-side surface of the third lens element, R6 is a radius of curvature of an image-side surface of the third lens element, R7 is a radius of curvature of an object-side surface of the fourth lens element, R8 is a radius of curvature of an image-side surface of the fourth lens element, R9 is a radius of curvature of an object-side surface of the fifth lens element, R10 is a radius of curvature of an image-side surface of the fifth lens element, R11 is a radius of curvature of an object-side surface of the sixth lens element, and R12 is a radius of curvature of an image.
4. The wide-angle lens of claim 1, further comprising an aperture disposed between the second lens and the third lens.
5. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following condition:
0.9<D1/D2<1.1；
wherein D1 is the aperture of the object side surface of the first lens element, and D2 is the aperture of the image side surface of the sixth lens element.
6. The wide-angle lens of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are each aspheric lenses.
7. The wide-angle lens of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all made of plastic.
8. The wide-angle lens of claim 1, wherein the wide-angle lens has a field angle greater than 100 degrees.
9. A camera module, comprising:
an image sensor; and
the wide-angle lens of any one of claims 1 to 8, the image sensor being disposed on an image side of the wide-angle lens.
10. An electronic device, comprising the camera module of claim 9 and a housing, the camera module being mounted on the housing.
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| CN202010120953.7A CN111308673B (en) | 2020-02-26 | 2020-02-26 | Wide-angle lens, camera module and electronic device |
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| CN111308673B (en) | 2022-03-22 |
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