CN211698374U - Optical lens, camera module and electronic equipment - Google Patents
Optical lens, camera module and electronic equipment Download PDFInfo
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- CN211698374U CN211698374U CN201921747091.XU CN201921747091U CN211698374U CN 211698374 U CN211698374 U CN 211698374U CN 201921747091 U CN201921747091 U CN 201921747091U CN 211698374 U CN211698374 U CN 211698374U
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Abstract
The application discloses an optical lens, at least includes from object side to image side along optical axis: an aperture, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a fourth lens having a negative refractive power; the effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy the following relation: | f/f2 | 0.73. The application also discloses a camera module and electronic equipment.
Description
Technical Field
The application relates to the field of optical elements, in particular to an optical lens, a camera module and electronic equipment.
Background
With the wide application of electronic devices, the requirements on the imaging function of the electronic devices are higher and higher; therefore, an optical lens capable of clearly photographing a short-distance object (e.g., a distance in the order of millimeters) is required.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides an optical lens, a camera module and an electronic device, which can clearly shoot objects in a short distance (such as a distance in millimeter magnitude).
The technical scheme of the embodiment of the application is realized as follows:
the present disclosure provides an optical lens assembly, including, from an object side to an image side along an optical axis:
an aperture, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a fourth lens having a negative refractive power;
the effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy the following relation: | f/f2 | 0.73.
In the above solution, the entrance pupil diameter EPD of the optical lens and the effective half aperture DTg of the aperture at the object side of the aperture satisfy the following relationship: EPD/DTg > 1.6.
In the above scheme, the height H1 of the object and the image height H2 of the object after passing through the optical lens satisfy the following relationship: 0.70 < H2/H1 < 0.85.
In the above scheme, the length ImgH of the half diagonal line of the effective pixel area on the imaging surface of the optical lens and the effective focal length f of the optical lens satisfy the following relationship: 1.0 < ImgH/f < 1.6.
In the above solution, the radius of curvature R1 of the object-side surface of the first lens and the effective focal length f1 of the first lens satisfy the following relationship: 0.5 < R1/f1 < 1.3.
In the above solution, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the distance TTL from the object-side surface of the first lens to the image plane of the optical lens on the optical axis satisfy the following relationships: 0.5 < CT (CT1+ CT2)/TTL 5 < 1.4.
In the above scheme, the entrance pupil diameter EPD of the optical lens and the half diagonal length ImgH of the effective pixel area on the imaging surface of the optical lens satisfy the following relationship: 0.3 < EPD/ImgH < 0.6.
In the foregoing solution, the distance TTL between the object-side surface of the first lens and the imaging surface of the optical lens on the optical axis and the length ImgH of the half diagonal line of the effective pixel area on the imaging surface of the optical lens satisfy the following relationship: TTL/ImgH is less than or equal to 1.6.
In the above aspect, after the fourth lens from the object side to the image side along the optical axis, the optical lens further includes: and a fifth lens.
The embodiment of the application further provides a camera module, which comprises the optical lens and the image sensor.
The embodiment of the application also provides electronic equipment, and the electronic equipment comprises the optical lens.
The optical lens, the camera module and the electronic device provided in the embodiments of the present application at least include, from an object side to an image side along an optical axis: an aperture, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a fourth lens having a negative refractive power; the effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy the following relation: | f/f2 | 0.73. By utilizing the optical lens and the electronic equipment provided by the embodiment of the application, a short-distance object can be clearly shot, such as a clear object with a shooting object distance of 3 mm.
Drawings
FIG. 1 is a schematic view illustrating an external optical lens installed outside an electronic device according to the present application;
FIG. 2 is a schematic view of an alternative structure of an optical lens according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of an alternative structure of an optical lens according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a light path in an optical lens according to an embodiment of the present disclosure when an imaging object distance of the optical lens is 3 mm;
FIG. 5 is a first schematic diagram illustrating optical performance of an optical lens according to an alternative embodiment of the present application;
FIG. 6 is a second schematic diagram illustrating optical performance of an optical lens according to an alternative embodiment of the present application;
fig. 7 is a third schematic diagram illustrating optical performance of an optical lens according to an alternative embodiment of the present application.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In order to photograph an object with an object distance of millimeter order, for example, when the object distance is smaller than 3mm, an optical lens inside the electronic device is not focused, and the object with the object distance of millimeter order cannot be imaged. However, the external optical lens may be disposed outside the electronic device, and the external optical lens may be attached to a surface of a main camera lens of the electronic device, as shown in fig. 1. However, the external optical lens increases the volume of the electronic device and is inconvenient to use.
In view of the above problems, the present application provides an optical lens, which has an alternative structure as shown in fig. 2, and includes, from an object side to an image side along an optical axis of the optical lens, at least: a diaphragm 10, a first lens 11 having a positive refractive power, a second lens 12 having a negative refractive power, a third lens 13 having a positive refractive power, and a fourth lens 14 having a negative refractive power.
In some embodiments, the first lens 11 has an object side surface 1 and an image side surface 2, and both the object side surface 1 and the image side surface 2 are convex. The second lens element 12 has an object side surface 3 and an image side surface 4, the object side surface 3 being concave. The third lens 13 has an object-side surface 5 and an image-side surface 6, wherein the object-side surface 5 is a concave surface, and the image-side surface 6 is a convex surface. The fourth lens element 14 has an object-side surface 7 and an image-side surface 8, wherein the object-side surface 7 is convex and the image-side surface 8 is concave.
In some embodiments, the entrance pupil diameter EPD of the optical lens and the effective half aperture DTg of the aperture 10 at the object side of the aperture 10 satisfy the following relationship: EPD/DTg > 1.6; such as: EPD/DTg is 2.0.
In some embodiments, the effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy the following relationship: | f/f2 | 0.73; such as f/f 2-0.5 or f/f 2-0.4.
In some embodiments, the height H1 of the object and the image height H2 of the object after the optical lens satisfy the following relationship: 0.70 < H2/H1 < 0.85; namely, the magnification ratio of the object imaged after passing through the optical lens is 0.70 to 0.85 times. In particular implementations, the magnification scale may be calculated by calculating a ratio of the height of the imaged object to the height of the object.
In some embodiments, the half diagonal length ImgH of the effective pixel area on the imaging plane of the optical lens and the effective focal length f of the optical lens satisfy the following relationship: 1.0 < ImgH/f < 1.6; for example, ImgH/f is 1.3.
In some embodiments, the radius of curvature R1 of the object side 1 of the first lens 11 and the effective focal length f1 of the first lens 11 satisfy the following relationship: 0.5 < R1/f1 < 1.3; for example, R1/f1 is 0.8.
In some embodiments, the central thickness CT1 of the first lens 11 on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the distance TTL from the object-side surface of the first lens 11 to the image plane of the optical lens satisfy the following relationship on the optical axis:
0.5﹤(CT1+CT2)/TTL*5﹤1.4。
in some embodiments, the entrance pupil diameter EPD of the optical lens and the half diagonal length ImgH of the effective pixel area on the imaging plane of the optical lens satisfy the following relationship: 0.3 < EPD/ImgH < 0.6.
In some embodiments, the distance TTL between the object-side surface 1 of the first lens element 11 and the imaging surface of the optical lens on the optical axis and the length ImgH of the half diagonal of the effective pixel area on the imaging surface of the optical lens satisfy the following relationship: TTL/ImgH is less than or equal to 1.6.
In some embodiments, as shown in fig. 3, in addition to the above elements, an alternative structure of the optical lens system from the object side to the image side along the optical axis after the fourth lens 14, the optical lens system further includes: and a fifth lens 15. The fifth lens 15 has an object side surface 9 and an image side surface 10; the fifth lens 15 may be an optical filter, or the fifth lens may be a glass sheet.
In the embodiment of the present application, the basic parameter table of the optical lens is as shown in table 1 below:
TABLE 1
The curvature radius in table 1 refers to a curvature radius at an intersection point of the optical axis and the object side surface or the image side surface. The distance-0.043 mm in table 1 means the distance between the aperture 10 and the apex of the object side 1 of the first lens 11 on the optical axis. The distance 0.579mm in table 1 refers to the distance between the vertex of the object side surface 1 of the first lens piece 11 and the vertex of the image side surface 2 of the first lens piece 11. The distance 0.018mm in table 1 means a distance between the vertex of the image side surface 2 of the first lens piece 11 and the vertex of the object side surface 3 of the second lens piece 12 on the optical axis. By analogy, the distance 0.210mm in table 1 refers to the distance on the optical axis between the vertex of the object-side face 3 of the second lens 12 and the vertex of the image-side face 4 of the second lens. 0.241 in table 1 is a distance between a vertex of the image side surface 4 of the second lens 12 and a vertex of the object side surface 5 of the third lens 13 on the optical axis. 0.934mm in table 1 refers to a distance on the optical axis between the vertex of the object side surface 5 of the third mirror 13 and the vertex of the image side surface 6 of the third mirror 13. 0.020mm in table 1 refers to the distance on the optical axis between the vertex of the image side surface 6 of the third mirror 13 and the vertex of the object side surface 7 of the fourth mirror 14. 0.407mm in table 1 means a distance between the vertex of the object-side surface 7 of the fourth mirror 14 and the vertex of the image-side surface 8 of the fourth mirror 14 on the optical axis. 0.666mm in table 1 refers to the distance on the optical axis between the vertex of the image side surface 8 of the fourth lens 14 and the vertex of the object side surface 9 of the fifth lens 15. 0.210 in table 1 refers to a distance between a vertex of the object-side surface 9 of the fifth mirror 15 and a vertex of the image-side surface 10 of the fifth mirror 15 on the optical axis. 0.285mm in table 1 means a distance between the vertex of the image side surface 10 of the fifth mirror 15 and the object image on the optical axis.
In some embodiments of the present application, the object-side surface and the image-side surface of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 are aspheric, and the aspheric surface satisfies the following formula:
wherein z is the depth of the aspheric surface, i.e. the distance between a point on the aspheric surface, for example, with an optical axis of Y, and a tangent plane perpendicular to the optical axis and passing through the vertex of the aspheric surface; c is 1/r, r is the surface curvature radius, h is the distance between the aspheric point and the optical axis, k is the cone coefficient, a is the fourth order coefficient, B is the sixth order coefficient, C is the eighth order coefficient, D is the tenth order coefficient, E is the twelfth order coefficient, F is the fourteenth order coefficient, and G is the sixteenth order coefficient. The parameters of each aspherical surface are shown in table 2 below:
TABLE 2
An optical lens based on fig. 2, table 1 and table 2 has an effective focal length f Of 1.335mm, a distance TTL Of 3.57mm on the optical axis from an object side surface Of the first lens to an image plane Of the optical lens, a Field Of View (FOV) Of a maximum image height Of 77.6 degrees, and an aperture value (f-number) Of 2.8.
The above tables 1 and 2 are merely an example, and the basic parameters of the optical lens and the parameters of each aspherical surface may be appropriately changed within the range satisfying the protection of the present application.
In this alternative embodiment, when the imaging object distance of the optical lens is 3mm, as shown in fig. 4, the light ray path in the optical lens forms an image after passing through the aperture 10, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 in sequence.
Fig. 5 is a schematic diagram of an optical performance of an optical lens according to an alternative embodiment of the present application, where the resolving power is a line pair that can be resolved by the optical lens per millimeter. As can be seen from fig. 5, when the Y-axis imaging height is 0.8mm and the resolving power of the optical lens is 110LP/mm, the MTF is 0.7.
A second schematic diagram of optical performance of the optical lens according to the alternative embodiment of the present application is, as shown in fig. 6, a schematic diagram of lateral chromatic aberration of imaging; the lateral chromatic aberration of light with different wavelengths is based on light with the wavelength of 555 nm.
Fig. 7 is a schematic diagram of an optical performance of an optical lens according to an alternative embodiment of the present application, which is a schematic diagram of a distortion curve of an image. The optical lens provided by the embodiment of the application is positioned in the camera module, and by utilizing the optical lens provided by the embodiment of the application or the camera module comprising the optical lens provided by the embodiment of the application, close-range objects can be clearly shot, such as objects with millimeter-order object distance; specifically, an object with an object distance of 3mm can be shot clearly; as can be seen from the optical performance diagrams shown in fig. 5, 6, and 7, the optical lens provided in the embodiment of the present application can achieve good imaging quality.
The camera module that this application embodiment provided can include image sensor in addition to the optical lens that this application embodiment provided.
The embodiment of the application also provides electronic equipment comprising the optical lens provided by the embodiment of the application.
It should be noted that in the embodiments of the present application, the expressions first, second, third, etc. are only used for distinguishing one feature from another, or for distinguishing different elements in the same class, and do not indicate any limitation on the feature or element. Accordingly, the first lens in the embodiments of the present application may also be referred to as a seventh lens, or an eighth lens, etc. without departing from the teachings of the present application.
The size, thickness and shape of the various lenses may be exaggerated for illustrative purposes and for purposes of explanation. That is, the shapes of the spherical surfaces or the aspherical surfaces shown in the drawings are shown by way of example, and thus, the shapes of the spherical surfaces or the aspherical surfaces are not limited to the shapes of the spherical surfaces or the aspherical surfaces described in the drawings; the figures are purely exemplary and not drawn to scale.
In the embodiments of the present application, the terms "comprises," "comprising," "includes," "including," and "includes" when used in this specification, specify the presence of stated features, elements, and components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, the term "comprising at least" when used in the present specification means that other features or elements than the at least included features or elements recited may be included.
In the embodiment of the present application, the surface of each lens closest to the object to be photographed is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (11)
1. An optical lens, comprising, from an object side to an image side along an optical axis:
an aperture, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a fourth lens having a negative refractive power;
the effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy the following relation: | f/f2 | 0.73.
2. An optical lens as claimed in claim 1, characterized in that the entrance pupil diameter EPD of the optical lens and the effective half aperture DTg of the aperture at the object side of the aperture satisfy the following relation: EPD/DTg > 1.6.
3. An optical lens according to claim 1, characterized in that the height H1 of an object and the image height H2 of the object after passing through the optical lens satisfy the following relationship:
0.70﹤H2/H1﹤0.85。
4. an optical lens according to claim 1, wherein a half diagonal length ImgH of an effective pixel area on an imaging plane of the optical lens and an effective focal length f of the optical lens satisfy the following relationship:
1.0﹤ImgH/f﹤1.6。
5. an optical lens according to claim 1, characterized in that the radius of curvature R1 of the object side of the first lens and the effective focal length f1 of the first lens satisfy the following relation:
0.5﹤R1/f1﹤1.3。
6. the optical lens of claim 1, wherein a center thickness CT1 of the first lens piece on the optical axis, a center thickness CT2 of the second lens piece on the optical axis, and a distance TTL between an object side surface of the first lens piece and an image plane of the optical lens on the optical axis satisfy the following relationship:
0.5﹤(CT1+CT2)/TTL*5﹤1.4。
7. the optical lens of claim 1, wherein the entrance pupil diameter EPD of the optical lens and the half diagonal length ImgH of the effective pixel area on the imaging plane of the optical lens satisfy the following relationship:
0.3﹤EPD/ImgH﹤0.6。
8. the optical lens barrel according to claim 1, wherein a distance TTL on the optical axis from an object side surface of the first lens element to an imaging surface of the optical lens to the imaging surface of the optical lens and a length ImgH of a half diagonal line of an effective pixel area on the imaging surface of the optical lens satisfy a relationship:
TTL/ImgH≤1.6。
9. an optical lens according to any one of claims 1 to 8, wherein the optical lens further includes, after the fourth lens, from an object side to an image side along an optical axis: and a fifth lens.
10. A camera module, characterized in that the camera module comprises an optical lens and an image sensor, wherein the optical lens is the optical lens according to any one of claims 1 to 9.
11. An electronic device characterized in that the electronic device comprises the optical lens of any one of claims 1 to 9.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN201921747091.XU CN211698374U (en) | 2019-10-16 | 2019-10-16 | Optical lens, camera module and electronic equipment |
EP20877213.7A EP4030215B1 (en) | 2019-10-16 | 2020-09-04 | Optical lens, camera module, and electronic device |
PCT/CN2020/113494 WO2021073303A1 (en) | 2019-10-16 | 2020-09-04 | Optical lens, camera module, and electronic device |
US17/689,951 US20220196972A1 (en) | 2019-10-16 | 2022-03-08 | Optical lens, camera module and electronic device |
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CN201921747091.XU CN211698374U (en) | 2019-10-16 | 2019-10-16 | Optical lens, camera module and electronic equipment |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2021196057A1 (en) * | 2020-04-01 | 2021-10-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Optical lens, imaging device, electrical device, method of manufacturing the same |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2021196057A1 (en) * | 2020-04-01 | 2021-10-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Optical lens, imaging device, electrical device, method of manufacturing the same |
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