CN113866936B - Optical lens, camera module and electronic equipment - Google Patents
Optical lens, camera module and electronic equipment Download PDFInfo
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- CN113866936B CN113866936B CN202010615939.4A CN202010615939A CN113866936B CN 113866936 B CN113866936 B CN 113866936B CN 202010615939 A CN202010615939 A CN 202010615939A CN 113866936 B CN113866936 B CN 113866936B
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- G—PHYSICS
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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- G—PHYSICS
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- G02B13/00—Optical objectives specially designed for the purposes specified below
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- 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 application provides an optical lens, a lens module and electronic equipment. The first lens of the optical lens has negative focal power, the second lens has positive focal power, the third lens has positive focal power, the fourth lens has positive focal power, the fifth lens has negative focal power, the fifth lens is an M-shaped lens, and at least one inflection point exists on at least one of the object side surface and the image side surface of the fifth lens. The lenses with different structures and different optical powers are matched with each other, so that the optical lens with the performances of small aperture F# value, large chief ray incidence angle, large field angle, small total optical length and the like can be obtained, and various use scenes and various use requirements can be met.
Description
Technical Field
The embodiment of the application relates to the field of lenses, in particular to an optical lens, a camera module and electronic equipment.
Background
With the progress of the imaging technology, the performance requirements for cameras are higher and higher. For example, cameras are required to have a small aperture f# value, a large chief ray incident angle, a large field angle, and a small total optical length, so that the cameras have excellent night view capturing and background blurring functions, high resolution performance, and a small length. In the prior art, a camera generally can only meet one characteristic of small aperture f# value, large chief ray incidence angle or small optical total length, and it is difficult for the camera to have small aperture f# value, large chief ray incidence angle, large field angle and small optical total length at the same time.
Disclosure of Invention
The embodiment of the application provides an optical lens, a camera module comprising the optical lens and electronic equipment comprising the camera module, and aims to obtain the optical lens which can simultaneously have the performances of small aperture F# value, large chief ray incidence angle, small total optical length and the like.
In a first aspect, an optical lens is provided. When the optical lens is provided with five lenses, the five lenses are respectively a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from the object side to the image side; when the optical lens has six lenses, the six lenses are a first lens, a second lens, a third lens, a fourth lens, a supplementary lens and a fifth lens which are sequentially arranged from an object side to an image side, and the first lens, the second lens, the third lens, the fourth lens and the fifth lens all comprise an object side face facing the object side and an image side face facing the image side. The first lens has negative focal power, the second lens has positive focal power, the third lens has positive focal power, the fourth lens has positive focal power, the fifth lens has negative focal power, the fifth lens is an M-shaped lens, and at least one inflection point exists on at least one of an object side surface and an image side surface of the fifth lens. The aperture value F# of the optical lens satisfies: f# is more than or equal to 0.8 and less than or equal to 2.8; the relationship between the effective focal length EFFL of the optical lens and the total optical length TTL of the optical lens satisfies the following conditions: EFFL/TTL is more than or equal to 0.2 and less than or equal to 0.9.
In this embodiment, first lens is negative focal power lens, can be effectual collect the external light collection of visual field and assemble in the optical system, is favorable to realizing the design of big angle of field. The second lens is a positive focal power lens, so that the light rays with large aperture and large view field are converged, the aperture of the lens is reduced, and the design of a large aperture lens is realized. The third lens can correct the residual aberration of the lens and improve the imaging quality of the lens. Wherein the third lens power may be positive or negative. The fourth lens is a positive focal power lens, can bear the main focal power of the lens, is beneficial to improving the aperture of the lens, and is further beneficial to realizing the design of a large aperture. The fifth lens is an M-shaped lens with negative focal power, at least one inflection point exists between the object side surface and at least one surface of the image measuring surface, and the characteristic that the fifth lens is M-shaped is utilized to facilitate the improvement of the incident angle of the principal ray of the lens, so that the design of a large incident angle of the principal ray is facilitated. In this embodiment, through the mutual cooperation setting of five lenses or six lenses of different structures and different focal power to can obtain the optical lens that has performances such as little light ring F# value, big principal ray incident angle and big angle of view, little optics total length simultaneously, so that the optical lens can satisfy various service scenarios and various user demands. In the embodiment of the present application, the aperture value f# satisfied by the optical lens satisfies: f# is more than or equal to 0.8 and less than or equal to 2.8, and the aperture value F# of the optical lens meets the following conditions: f# is more than or equal to 0.8 and less than or equal to 2.8. The aperture to value F# of the optical lens can be smaller, the application requirement of a large aperture in the market can be covered, and the purpose of providing a large aperture lens is achieved. The number of lenses of the optical lens is five or six, that is, the number of the optical lenses of the application is small, and the optical lens 10 can have a small total optical length through the cooperation of the structure and the focal power of the lens. In the application, the relation between the effective focal length EFFL of the optical lens and the total optical length TTL of the optical lens satisfies the following conditions: the EFFL/TTL is more than or equal to 0.2 and less than or equal to 0.9, and the optical lens can have smaller total optical length, so that the optical lens can have the characteristic of miniaturization, and is better suitable for miniaturized electronic equipment.
In some embodiments, at least one of the second lens and the fourth lens is a glass lens, and the other lenses of the optical lens are plastic lenses. Because the cost of plastic lens can be lower than the cost of glass lens, among this application embodiment, other lenses are plastic material lens, for the camera that all adopts glass lens among the prior art, adopt glass material lens and the mixed mode of lens of plastic material, can greatly reduced lens cost, be favorable to realizing the low-cost design of optical lens. In addition, the refractive index of the glass lens with the temperature change relation satisfies dn/dT >0, and the refractive index of the plastic lens with the temperature change relation satisfies dn/dT < 0, so that the optimal image plane drift (namely temperature drift) of the optical lens caused by environmental change can be corrected by utilizing the temperature characteristics of the glass lens and the plastic lens, and the optical lens can image clearly in a full temperature range from at least minus 40 ℃ to +85 ℃ in a focusing mode without a motor and the like. In the present embodiment, at least one of the second lens and the fourth lens is a glass lens, and since both the second lens and the fourth lens have positive power, correction of the optimum image plane shift of the optical lens can be more preferably achieved.
The object side surface and the image side surface of the second lens are convex at the paraxial region, and the object side surface and the image side surface of the fourth lens are convex at the paraxial region. When the second lens and/or the fourth lens are/is glass lenses, the object side surface and the image side surface of the second lens and/or the fourth lens are convex at the paraxial region, so that the dn/dT value of the second lens and/or the fourth lens is larger, and the second lens or the fourth lens can have better function of correcting the temperature drift of the optical lens.
The object side surface of the first lens is a concave surface at the paraxial region. When the measuring surface of the first lens object is concave at the paraxial region, the large aperture lens can be effectively dispersed into a larger caliber, so that the correction of the spherical aberration of the large aperture lens is facilitated, and the design of the large aperture lens is facilitated.
The object side surface of the third lens is a convex surface at the paraxial region, and the image side surface of the third lens is a concave surface at the paraxial region. The object side surface of the third lens element is convex at the paraxial region, and when the image side surface is concave at the paraxial region, the phase difference generated by the third lens element can be smaller, so that the residual aberration of the optical lens can be better corrected, and the imaging quality of the optical lens can be improved.
The object side surface of the fifth lens element may be concave or convex at the paraxial region, and the image side surface thereof may be concave at the paraxial region, so as to better improve the incident angle of the chief ray of the optical lens assembly.
In some embodiments, the focal length f of the fourth lens 4 The relationship with the focal length EFFL of the optical lens satisfies: f is more than or equal to 0.5 4 EFFL is less than or equal to 2.0. In the embodiment of the present application, since the fourth lens element takes on the main focal power of the optical lens, when the focal length f of the fourth lens element 4 When the relationship with the focal length EFFL of the optical lens satisfies the above relationshipThe design of the large aperture can be realized more easily.
In some embodiments, the relationship between the effective focal length EFFL of the optical lens and the maximum image height IH of the optical lens satisfies: EFFL/IH is more than or equal to 0.4 and less than or equal to 2.0. In the embodiment of the present application, when the optical lens satisfies the above relationship, the optical lens can be realized to have a large image height. The larger the image height which can be obtained by the optical lens under the same focal length, the larger the field angle of the optical lens, and the higher the pixels of the adaptable photosensitive element, so that the optical lens can have the characteristics of large field of view and high pixels.
In some embodiments, the relationship between the effective focal length EFFL, the aperture value f# and the total optical length TTL of the optical lens satisfies: EFFL/(F#. Times.TTL) of 0.1 to 0.5. In the present embodiment, when the optical lens satisfies the above relationship, the optical lens can have both the characteristics of a large aperture and miniaturization.
In some embodiments, the relationship between the effective focal length EFFL, the total optical length TTL, the maximum image height IH and the f# of the optical lens satisfies: (IH×EFFL)/(F# ×TTL2) is less than or equal to 0.3. In the present embodiment, when the optical lens satisfies the above relationship, the maximum image height IH of the optical lens is large, and the aperture value f# and the total optical length TTL are small, so that the optical lens can have the characteristics of a large aperture, a small size, a large angle of view, and a high pixel.
In some embodiments, the field angle FOV of the optical lens is 40 ° or more and 140 ° or less, that is, in the embodiments of the present application, the variation range of the field angle FOV of the optical lens may be larger, so that the optical lens with any field angle may be designed according to actual needs. In some embodiments of the present application, the field angle of the optical lens can reach 140 ° at maximum, so that the optical lens can have a larger shooting field.
In some embodiments, the abbe number v2 of the second lens and the abbe number v3 of the third lens satisfy the relationship: the I v2-v 3I is more than or equal to 15. When the abbe number v2 of the second lens and the abbe number v3 of the third lens meet the above relation, the third lens can more easily achieve the purpose of correcting chromatic aberration, improve imaging quality of the optical lens and enhance resolving power of the optical lens.
In some embodiments, the abbe number v4 of the fourth lens and the abbe number v3 of the third lens satisfy the relationship: the V4-V3I is more than or equal to 15. When the abbe number v4 of the fourth lens and the abbe number v3 of the third lens meet the above relation, the third lens can more easily achieve the purpose of correcting chromatic aberration, further improve the imaging quality of the optical lens and enhance the resolving power of the optical lens.
In some embodiments, the supplemental lens has optical power, and the abbe number v5 of the supplemental lens and the abbe number v4 of the fourth lens satisfy the relationship: the V4-V5I is more than or equal to 15. In this embodiment, the power of the supplemental lens can be positive or negative, and both the object-side and image-side surfaces can be convex or concave at the paraxial region. The supplementary lens is arranged between the fourth lens and the fifth lens, so that the residual aberration of the system can be effectively corrected, and the imaging quality of the optical lens is improved. Further, when the abbe number of the supplemental lens and the abbe number v4 of the fourth lens satisfy the above relationship, the purpose of correcting chromatic aberration can be more easily achieved.
In a second aspect, the present application further provides a camera module, where the camera module includes a photosensitive element and the optical lens, the photosensitive element is located on an image side of the optical lens, and the photosensitive element is configured to convert an optical signal transmitted by the optical lens into an electrical signal.
The camera module comprises the optical lens and a photosensitive element. When the camera works, light reflected by an external scenery is refracted by the optical lens and then imaged on the photosensitive element, and the photosensitive element converts an optical signal of the image into an electric signal, so that an image is obtained through shooting. In this application, because the optical lens can have performances such as little light ring F# value, big chief ray incident angle and big chief ray incident angle simultaneously for camera module can all present better imaging under different application scenes.
In a third aspect, the present application provides an electronic device. The electronic equipment comprises an image processor and a camera module, wherein the image processor is in communication connection with the camera module, the camera module is used for acquiring image data and inputting the image data into the image processor, and the image processor is used for processing the image data output from the image processor. In this application, the image processor may be an image processing chip, an image processing circuit, or an image processing algorithm code for performing image processing.
When the camera module is applied to the electronic equipment, the camera module can show better imaging effect under different application scenes, so that the electronic equipment comprising the camera module can be suitable for various application scenes, thereby improving the imaging quality of the electronic equipment and having better practical application value.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device of the present application.
Fig. 2 is a schematic diagram of an internal structure of the electronic device according to the embodiment shown in fig. 1.
Fig. 3 is a schematic structural diagram of a lens module according to an embodiment of the present application.
Fig. 4 is a schematic view of a part of the structure of an optical lens 10 according to a first embodiment of the present application.
Fig. 5 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the first embodiment.
Fig. 6 is a plot of the principal ray incidence angle of the optical lens of the first embodiment.
Fig. 7a is a temperature drift modulation contrast curve of the optical lens of the first embodiment at normal temperature.
Fig. 7b is a temperature drift modulation contrast curve of the optical lens of the first embodiment at-30 ℃.
Fig. 7c is a temperature drift modulation contrast curve of the optical lens of the first embodiment at +70 ℃.
Fig. 8 is a schematic view of a part of the structure of an optical lens 10 according to a second embodiment of the present application.
Fig. 9 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the second embodiment.
Fig. 10 is a plot of the principal ray incidence angle of the optical lens of the second embodiment.
Fig. 11a is a temperature drift modulation contrast curve of the optical lens of the second embodiment at normal temperature.
Fig. 11b is a temperature drift modulation contrast curve of the optical lens of the second embodiment at-30 ℃.
Fig. 11c is a temperature drift modulation contrast curve of the optical lens of the second embodiment at +70 ℃.
Fig. 12 is a schematic view showing a partial structure of an optical lens 10 according to a third embodiment of the present application.
Fig. 13 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the third embodiment.
Fig. 14 is a plot of the chief ray incidence angle of the optical lens of the third embodiment.
Fig. 15a is a temperature drift modulation contrast curve of the optical lens of the third embodiment at normal temperature.
Fig. 15b is a temperature drift modulation contrast curve of the optical lens of the third embodiment at-30 ℃.
Fig. 15c is a temperature drift modulation contrast curve of the optical lens of the third embodiment at +70 ℃.
Fig. 16 is a schematic view showing a partial structure of an optical lens 10 according to a fourth embodiment of the present application.
Fig. 17 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the fourth embodiment.
Fig. 18 is a principal ray incidence angle curve of the optical lens of the fourth embodiment.
Fig. 19a is a temperature drift modulation contrast curve of the optical lens of the fourth embodiment at normal temperature.
Fig. 19b is a temperature drift modulation contrast curve of the optical lens of the fourth embodiment at-30 ℃.
Fig. 19c is a temperature drift modulation contrast curve of the optical lens of the fourth embodiment at +70 ℃.
Fig. 20 is a schematic view showing a partial structure of an optical lens 10 according to a fifth embodiment of the present application.
Fig. 21 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the fifth embodiment.
Fig. 22 is a principal ray incidence angle curve of the optical lens of the fifth embodiment.
Fig. 23a is a temperature drift modulation contrast curve of the optical lens of the fifth embodiment at normal temperature.
Fig. 23b is a temperature drift modulation contrast curve of the optical lens of the fifth embodiment at-30 ℃.
Fig. 23c is a temperature drift modulation contrast curve of the optical lens of the fifth embodiment at +70 ℃.
Fig. 24 is a schematic view showing a partial structure of an optical lens 10 according to a sixth embodiment of the present application.
Fig. 25 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the sixth embodiment.
Fig. 26 is a principal ray incidence angle curve of the optical lens of the sixth embodiment.
Fig. 27a is a temperature drift modulation contrast curve of the optical lens of the sixth embodiment at normal temperature.
Fig. 27b is a temperature drift modulation contrast curve of the optical lens of the sixth embodiment at-30 ℃.
Fig. 27c is a temperature drift modulation contrast curve of the optical lens of the sixth embodiment at +70 ℃.
Fig. 28 is a schematic view of a part of the structure of an optical lens 10 according to a seventh embodiment of the present application.
Fig. 29 is a schematic view showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the seventh embodiment.
Fig. 30 is a principal ray incidence angle curve of the optical lens of the seventh embodiment.
Fig. 31a is a temperature drift modulation contrast curve of the optical lens of the seventh embodiment at normal temperature.
Fig. 31b is a temperature drift modulation contrast curve of the optical lens of the seventh embodiment at-30 ℃.
Fig. 31c is a temperature drift modulation contrast curve of the optical lens of the seventh embodiment at +70 ℃.
Fig. 32 is a schematic view showing a partial structure of an optical lens 10 according to an eighth embodiment of the present application.
Fig. 33 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, respectively, after passing through the optical lens of the eighth embodiment.
Fig. 34 is a principal ray incidence angle curve of the optical lens of the eighth embodiment.
Fig. 35a is a temperature drift modulation contrast curve of the optical lens of the eighth embodiment at normal temperature.
Fig. 35b is a temperature drift modulation contrast curve of the optical lens of the eighth embodiment at-30 ℃.
Fig. 35c is a temperature drift modulation contrast curve of the optical lens of the eighth embodiment at +70 ℃.
Fig. 36 is a schematic view showing a partial structure of an optical lens 10 according to a ninth embodiment of the present application.
Fig. 37 is a schematic view showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the ninth embodiment.
Fig. 38 is a principal ray incidence angle curve of the optical lens of the ninth embodiment.
Fig. 39a is a temperature drift modulation contrast curve of the optical lens of the ninth embodiment at normal temperature.
Fig. 39b is a temperature drift modulation contrast curve of the optical lens of the ninth embodiment at-30 ℃.
Fig. 39c is a temperature drift modulation contrast curve of the optical lens of the ninth embodiment at +70 ℃.
Fig. 40 is a schematic view of a part of the structure of an optical lens 10 according to a tenth embodiment of the present application.
Fig. 41 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, respectively, after passing through the optical lens of the tenth embodiment.
Fig. 42 is a principal ray incidence angle curve of the optical lens of the tenth embodiment.
Fig. 43a is a temperature drift modulation contrast curve of the optical lens of the tenth embodiment at normal temperature.
Fig. 43b is a temperature drift modulation contrast curve of the optical lens of the tenth embodiment at-30 ℃.
Fig. 43c is a temperature drift modulation contrast curve of the optical lens of the tenth embodiment at +70 ℃.
Fig. 44 is a partial schematic view of an optical lens 10 according to an eleventh embodiment of the present application.
Fig. 45 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the eleventh embodiment.
Fig. 46 is a principal ray incidence angle curve of the optical lens of the eleventh embodiment.
Fig. 47a is a temperature drift modulation contrast curve of the optical lens of the eleventh embodiment at normal temperature.
Fig. 47b is a temperature drift modulation contrast curve of the optical lens of the eleventh embodiment at-30 ℃.
Fig. 47c is a temperature drift modulation contrast curve of the optical lens of the eleventh embodiment at +70 ℃.
Fig. 48 is a schematic view showing a part of the structure of an optical lens 10 according to a twelfth embodiment of the present application.
Fig. 49 is a schematic view showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the twelfth embodiment.
Fig. 50 is a principal ray incidence angle curve of the optical lens of the twelfth embodiment.
Fig. 51a is a temperature drift modulation contrast curve of the optical lens of the twelfth embodiment at normal temperature.
Fig. 51b is a temperature drift modulation contrast curve of the optical lens of the twelfth embodiment at-30 ℃.
Fig. 51c is a temperature drift modulation contrast curve of the optical lens of the twelfth embodiment at +70 ℃.
Fig. 52 is a schematic view showing a partial structure of an optical lens 10 according to a thirteenth embodiment of the present application.
Fig. 53 is a schematic view showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the thirteenth embodiment.
Fig. 54 is a principal ray incidence angle curve of the optical lens of the thirteenth embodiment.
Fig. 55a is a temperature drift modulation contrast curve of the optical lens of the thirteenth embodiment at normal temperature.
Fig. 55b is a temperature drift modulation contrast curve of the optical lens of the thirteenth embodiment at-30 ℃.
Fig. 55c is a temperature drift modulation contrast curve of the optical lens of the thirteenth embodiment at +70℃.
Fig. 56 is a schematic view showing a partial structure of an optical lens 10 according to a fourteenth embodiment of the present invention.
Fig. 57 is a schematic view showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the fourteenth embodiment.
Fig. 58 is a principal ray incidence angle curve of the optical lens of the fourteenth embodiment.
Fig. 59a is a temperature drift modulation contrast curve of the optical lens of the fourteenth embodiment at normal temperature.
Fig. 59b is a temperature drift modulation contrast curve of the optical lens of the fourteenth embodiment at-30 ℃.
Fig. 59c is a temperature drift modulation contrast curve of the optical lens of the fourteenth embodiment at +70℃.
Fig. 60 is a schematic view showing a partial structure of an optical lens 10 according to a fifteenth embodiment of the present application.
Fig. 61 is a schematic view showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the fifteenth embodiment.
Fig. 62 is a principal ray incidence angle curve of the optical lens of the fifteenth embodiment.
Fig. 63a is a temperature drift modulation contrast curve of the optical lens of the fifteenth embodiment at normal temperature.
Fig. 63b is a temperature drift modulation contrast curve of the optical lens of the fifteenth embodiment at-30 ℃.
Fig. 63c is a temperature drift modulation contrast curve of the optical lens of the fifteenth embodiment at +70℃.
Fig. 64 is a schematic view showing a part of the structure of an optical lens 10 according to a sixteenth embodiment of the present application.
Fig. 65 is a schematic view showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the sixteenth embodiment.
Fig. 66 is a principal ray incidence angle curve of the optical lens of the sixteenth embodiment.
Fig. 67a is a temperature drift modulation contrast curve of the optical lens of the sixteenth embodiment at normal temperature.
Fig. 67b is a temperature drift modulation contrast curve of the optical lens of the sixteenth embodiment at-30 ℃.
Fig. 67c is a temperature drift modulation contrast curve of the optical lens of the sixteenth embodiment at +70 ℃.
Fig. 68 is a schematic view showing a partial structure of an optical lens 10 according to a seventeenth embodiment of the present application.
Fig. 69 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens of the seventeenth embodiment.
Fig. 70 is a plot of chief ray incidence angles for an optical lens of the seventeenth embodiment.
Fig. 71a is a temperature drift modulation contrast curve of the optical lens of the seventeenth embodiment at normal temperature.
Fig. 71b is a temperature drift modulation contrast curve of the optical lens of the seventeenth embodiment at-30 ℃.
Fig. 71c is a temperature drift modulation contrast curve of the optical lens of the seventeenth embodiment at +70 ℃.
Fig. 72 is a schematic view showing a partial structure of an optical lens 10 according to an eighteenth embodiment of the present application.
Fig. 73 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, respectively, after passing through the optical lens of the eighteenth embodiment.
Fig. 74 is a principal ray incidence angle curve of the optical lens of the eighteenth embodiment.
Fig. 75a is a temperature drift modulation contrast curve of the optical lens of the eighteenth embodiment at normal temperature.
Fig. 75b is a temperature drift modulation contrast curve of the optical lens of the eighteenth embodiment at-30 ℃.
Fig. 75c is a temperature drift modulation contrast curve of the optical lens of the eighteenth embodiment at +70 ℃.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
For ease of understanding, the technical terms referred to in the present application are explained and described below.
Focal length (f), also known as focal length, is a measure of the concentration or divergence of light in an optical system, meaning the perpendicular distance from the optical center of a lens or lens group to an imaging surface when a scene at infinity is brought into clear images through the lens or lens group at the imaging surface. For a thin lens, the focal length is the distance from the center of the lens to the imaging surface; for thick lenses or lens groups, the focal length is equal to the effective focal length (effective focal length, EFFL), i.e., the distance from the back major plane of the lens or lens group to the imaging plane.
The aperture is a device for controlling the quantity of light transmitted through the lens and entering the photosensitive surface of the body, and is usually arranged in the lens. The expressed aperture size is expressed in terms of F/number.
The F-number is a relative value (reciprocal of relative aperture) obtained by the focal length of the lens and the light passing diameter of the lens. The smaller the aperture F value, the more the amount of light is entered in the same unit time. The larger the aperture F value is, the smaller the depth of field is, and the photographed background content will be virtual, similar to the effect of a tele lens.
And a back focal (Back Focal Length, BFL), a distance from a lens closest to an image side in the optical lens to an imaging surface of the optical lens.
Positive optical power, which may also be referred to as positive optical power, means that the lens has a positive focal length and has the effect of converging light.
Negative power, which may also be referred to as negative power, means that the lens has a negative focal length, with the effect of diverging light.
The optical total length (total track length, TTL), which refers to the total length from the object side of the lens closest to the object side of the optical lens to the imaging plane, is a major factor in forming the camera height.
Abbe number, the Abbe's number, is the ratio of the difference in refractive index of an optical material at different wavelengths, and represents the magnitude of the material's dispersion.
In the optical apparatus, a lens of the optical apparatus is taken as a vertex, and an included angle formed by two edges of a maximum range of a measured object image passing through the lens is called a field angle. The size of the angle of view determines the field of view of the optical instrument, and the larger the angle of view, the larger the field of view and the smaller the optical magnification.
Chief ray: light passing through the center of the system entrance pupil and exit pupil.
Chief Ray Angle of incidence (CRA): the angle of incidence of the chief ray on the image plane.
Temperature bleaching: the offset of the optimal image plane of the system at a certain temperature and the optimal image plane at normal temperature.
Modulation contrast (Modulation Transfer Function, MTF): an evaluation of the imaging quality of the system.
The optical axis is a ray passing perpendicularly through the center of the ideal lens. When light parallel to the optical axis enters the convex lens, the ideal convex lens is a point where all light is converged behind the lens, and the point where all light is converged is the focal point. The light ray does not change its transmission direction when propagating along the optical axis.
And the object side is the object side by taking the lens as a boundary, and the side where the scenery to be imaged is located is the object side.
The image side is the image side with the lens as the boundary and the side where the image of the scenery to be imaged is located.
The surface of the lens near the object side is called the object side.
The surface of the lens near the image side is called the image side.
Taking a lens as a boundary, taking the side where a shot object is positioned as an object side, and the surface of the lens close to the object side can be called an object side; with the lens as a boundary, the side on which the image of the subject is located is the image side, and the surface of the lens near the image side may be referred to as the image side.
Axial chromatic aberration, also known as longitudinal chromatic aberration or positional chromatic aberration or axial chromatic aberration, a bundle of rays parallel to the optical axis, after passing through the lens, converges at different positions back and forth, this aberration being known as positional chromatic aberration or axial chromatic aberration. This is because the lens images light of each wavelength at different positions, so that the imaging surfaces of the light of different colors cannot coincide when the light is finally imaged, and the light of multiple colors is scattered to form dispersion.
Lateral chromatic aberration, also called chromatic aberration of magnification, is the difference in magnification of the optical system for different colors of light. The wavelength causes a change in the magnification of the optical system, with a change in the size of the image.
Distortion (distortion), also known as distortion, is the degree of distortion of an image of an object by an optical system relative to the object itself. The distortion is caused by the influence of the spherical aberration of the diaphragm, the height of the intersection point between the chief rays of different view fields and the Gaussian image plane after passing through the optical system is not equal to the ideal height, and the difference between the chief rays and the Gaussian image plane is the distortion. Therefore, the distortion only changes the imaging position of the off-axis object point on the ideal plane, so that the shape of the image is distorted, but the definition of the image is not affected.
The optical distortion (optical distortion) refers to the degree of distortion calculated in optical theory.
Diffraction limit (diffraction limit), which means that an ideal object point is imaged by an optical system, due to diffraction limitations, it is not possible to obtain the ideal image point, but a diffraction image of the Fulange's sum cost. Since the aperture of a general optical system is circular, the diffraction image of the f-number and the f-number is so-called airy disk. Thus, the image of each object point is a diffuse spot, and two diffuse spots are not well distinguished after being close, so that the resolution of the system is limited, and the larger the spot is, the lower the resolution is.
The on-axis thickness (TTL 1) of the multiple lenses refers to the distance between the intersection of the axis of the optical lens and the object side of the first lens and the intersection of the axis of the optical lens and the image side of the last lens.
The application provides an electronic device, which can be security monitoring cameras, vehicle-mounted cameras, smart phones, tablet computers, portable computers, video cameras, video recorders, cameras or other devices with photographing or shooting functions. Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device 1000 according to an embodiment of the present application. In this embodiment, the electronic device 1000 is a security monitoring camera. The present application describes an electronic device 1000 as an example of a security surveillance camera.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating an internal structure of the electronic device 1000 according to the embodiment shown in fig. 1. The electronic device 1000 includes a lens module 100 and an image processor 200 communicatively connected to the lens module 100. The lens module 100 is used for acquiring image data and inputting the image data into the image processor 200 so that the image processor 200 processes the image data. The communication connection between the lens module 100 and the image processor 200 may include data transmission through electrical connection such as wiring, or may also realize data transmission through coupling. It will be appreciated that the lens module 100 and the image processor 200 may be communicatively connected by other means capable of data transmission.
The function of the image processor 200 is to optimize the digital image signal by a series of complex mathematical algorithms and to finally transmit the processed signal to a display for display. The image processor 200 may be an image processing chip or a digital signal processing chip (DSP), and may be an image processing current or the like.
In some implementations, the electronic device 1000 also includes an analog-to-digital converter (also may be referred to as an a/D converter) 300. The analog-to-digital conversion module 300 is connected between the lens module 100 and the image processor 200. The analog-to-digital conversion module 300 is used for converting the signal generated by the lens module 100 into a digital image signal, transmitting the digital image signal to the image processor 200, and processing the digital image signal by the image processor 200.
In some embodiments, the electronic device 1000 further includes a memory 400, where the memory 400 is communicatively connected to the image processor 200, and the image processor 200 processes the digital image signal and then transmits the processed digital image to the memory 400, so that the image can be searched from the memory and displayed on the display screen at any time when the image needs to be checked later. In some embodiments, the image processor 200 further compresses the processed image digital signal and stores the compressed image digital signal in the memory 400, so as to save the memory 400 space. It should be noted that fig. 2 is only a schematic diagram of the internal structure of the electronic device 1000 according to one embodiment of the present application, and the positions, structures, etc. of the lens module 100, the image processor 200, the analog-to-digital conversion module 300, and the memory 400 are shown only as examples.
In this embodiment, the electronic device 1000 further includes a housing 500, and the lens module 100, the image processor 200, the analog-to-digital conversion module 300, the memory 400, and other structures are accommodated in the housing 500, so that the structures disposed in the housing 500 are protected. The housing 500 is provided with an opening 501, the lens module 100 is disposed towards the opening 501, and light outside the electronic device 1000 is irradiated into the lens module 100 through the opening 501, that is, the lens module 100 can shoot a scene outside the electronic device 1000 through the opening 501. In some implementations, the electronic device 1000 also includes a protective cover 502. The protective cover 502 is a transparent plate, and the protective cover 502 is fixed on the housing 500 and shields the opening 501, so that foreign matters such as water and dust from the outside are prevented from entering the housing 500 through the opening 501, and each structure accommodated in the housing 500 is protected.
The lens module 100 includes an optical lens 10 and a photosensitive element 20. The photosensitive element 20 is located on the image side of the optical lens 10, and the photosensitive element 20 is located on the imaging surface of the optical lens 10. The imaging plane refers to a plane where an image obtained by imaging a scene through the optical lens 10 is located. When the lens module 100 operates, a subject to be imaged is imaged on the photosensitive element 20 after passing through the optical lens 10. Specifically, the working principle of the lens module 100 is as follows: the light L reflected by the photographed object is generated by the optical lens 10 and projected onto the surface of the photosensitive element 20, and the photosensitive element 20 converts the optical image into an electrical signal, i.e., an analog image signal S1, and transmits the converted analog image signal S1 to the analog-to-digital conversion module 300, so as to be converted into a digital image signal S2 by the analog-to-digital conversion module 300 to the image processor 200.
The photosensitive element 20 is a semiconductor chip, the surface of which contains hundreds of thousands to millions of photodiodes, and when irradiated by light, charges are generated, and the charges are converted into digital signals by the analog-to-digital conversion module 300. The photosensitive element 20 may be a charge coupled device (charge coupled device, CCD) or a complementary metal oxide conductor device (complementary metal-oxide semiconductor, CMOS). The CCD 20 is made of a semiconductor material with high photosensitivity, and can convert light into electric charge, and convert the electric charge into digital signals through the A/D conversion module 300. CCDs are composed of a number of photosensitive units, typically in megapixels. When the CCD surface is irradiated by light, each photosensitive unit converts the light signal irradiated on the CCD surface into an electric signal, and the signals generated by all the photosensitive units are added together to form a complete picture. Complementary metal oxide semiconductor CMOS is mainly made of two elements, silicon and germanium, so that N (negatively charged) and P (positively charged) level semiconductors coexist on the CMOS, and the current generated by the two complementary effects can be recorded and interpreted into an image by a processing chip.
The optical lens 10 affects the imaging quality and imaging effect, and after passing through the optical lens 10, the subject light forms a clear image on the imaging plane, and the image of the subject is recorded by the photosensitive element 20 located on the imaging plane. In the present application, the optical lens 10 includes a plurality of lenses arranged from an object side to an image side, and the lenses are coaxially disposed. The image with better imaging effect is formed by the matching of the lenses. The object side refers to the side where the shot object is located, and the image side refers to the side where the imaging plane is located.
In this application, the optical lens 10 may be a fixed focal length lens or a zoom lens. The fixed focal length lens is that the lens positions in the components are relatively fixed, so that the focal length of the optical lens 10 is ensured to be fixed. The zoom lens is capable of moving relative to each other, and changes the focal length of the optical lens 10 by moving the relative positions of the different lenses. Specifically, in some embodiments, the lens module 100 further includes a driving member, where the driving member is connected to at least one lens of the optical lens 10 to drive the lens to move through the driving member, so as to change a distance between different lenses, thereby changing a focal length of the optical lens 10. In some embodiments, the driving member can also drive the lens to move, so as to achieve the focusing and anti-shake of the optical lens 10. In the embodiment of the present application, the driving member may be a motor, a voice coil motor, or other various driving structures.
In some embodiments, the optical lens 10 is capable of axial movement relative to the photosensitive element 20 such that the optical lens 10 is either near or far from the photosensitive element 20. When the optical lens 10 is a zoom lens and the focal length of the optical lens 10 is changed, the optical lens 10 is correspondingly moved axially relative to the photosensitive element 20, so that the photosensitive element 20 can be always positioned on the imaging surface of the optical lens, and better imaging of the optical lens 10 at any focal length can be ensured. It will be appreciated that in some embodiments, when the distance between the lenses in the optical lens 10 is moved to change the focal length of the optical lens 10, the distance between the lenses in the optical lens 10 and the photosensitive element 20 may also be changed so that the photosensitive element 20 is located on the imaging surface of the optical lens 10. At this time, the distance between the optical lens 10 and the photosensitive element 20 may be unchanged.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a lens module 100 according to an embodiment of the present application. In this embodiment, the lens module 100 further includes a fixed base 50 (holder), an infrared filter 30, a circuit board 60, and the like. The optical lens 10 further includes a lens barrel 10a, each lens of the optical lens 10 is fixed in the lens barrel 10a, and the lenses fixed in the lens barrel 10a are coaxially disposed.
The photosensitive element 20 is fixed to the wiring board 60 by means of bonding or sticking, and the analog-digital conversion module 300, the image processor 200, the memory 400, and the like are also bonded or stuck to the wiring board 60, so that communication connection between the photosensitive element 20, the analog-digital conversion module 300, the image processor 200, the memory 400, and the like is achieved through the wiring board 60. In some embodiments, the stationary base is fixed to the circuit board 60. The wiring board 60 may be a flexible circuit board (flexible printed circuit, FPC) or a printed circuit board (printed circuit board, PCB) for transmitting electrical signals, wherein the FPC may be a single-sided flexible board, a double-sided flexible board, a multi-layer flexible board, a rigid flexible board, a flexible circuit board of a hybrid structure, or the like. Other components included in the lens module 100 will not be described in detail herein.
In some embodiments, the infrared filter 30 may be fixed on the circuit board 60 and located between the optical lens 10 and the light sensing element 20. The light beam passing through the optical lens 10 irradiates the infrared filter 30, and is transmitted to the photosensitive element 20 through the infrared filter 30. The infrared filter can eliminate unnecessary light projected onto the photosensitive element 20, and prevent the photosensitive element 20 from generating false color or moire to improve its effective resolution and color reproducibility. In some embodiments, the infrared filter 30 may also be fixed on an end of the optical lens 10 facing the image side.
In some embodiments, the infrared filter 30 may be replaced by an electromagnetic/electromechanical filter switch (ICR). ICR is located between photosensitive element 20 and optic 11 of lens 10. Under the condition of sufficient illumination (such as white days), the ICR automatically installs an infrared filter between the photosensitive element and the lens 11 of the optical lens. The light refracted by each lens 11 of the lens 10 irradiates the infrared filter 30, and is transmitted to the photosensitive element 20 through the infrared filter 30. The infrared filter 30 can filter out unnecessary light projected onto the photosensitive element 20 to prevent the photosensitive element 20 from generating false color or moire, so as to improve the effective resolution and color reproducibility thereof, thereby enabling the lens to monitor in a color mode. Under the condition of low illumination (such as night or extremely dark light), the ICR can automatically remove the infrared filter, so that the lens is automatically converted into a black-and-white mode for monitoring, and the optical lens can work under any illumination scene.
In some embodiments, the lens 10 further includes a diaphragm 12, where the diaphragm 12 may be disposed on the object side of the plurality of lenses, or between lenses 11 of the plurality of lenses that are close to the object side. The aperture stop 12 may be an aperture stop 12, the aperture stop 12 being used to limit the amount of light entering to change the brightness of the image.
In some embodiments, the fixing base 50 is fixed on the circuit board 60, the optical lens 10, the infrared filter 30 and the photosensitive element 20 are all accommodated in the fixing base 50, and the photosensitive element 20, the infrared filter 30 and the optical lens 10 are sequentially stacked above the circuit board 60, so that the light passing through the optical lens 10 can be irradiated onto the infrared filter 30 and transmitted to the photosensitive element 20 through the infrared filter 30. The lens barrel 10a of the optical lens 10 is connected to the fixed base 50 and is movable with respect to the fixed base 50, thereby changing the distance between the optical lens 10 and the photosensitive element 20. Specifically, in some embodiments of the present application, the fixed base 50 includes a fixed cylinder 51, an inner wall of the fixed cylinder 51 is provided with an internal thread, an outer wall of the lens barrel 10a is provided with an external thread, and the lens barrel 10a is screwed with the fixed cylinder 51. The lens barrel 10a is connected to a driving member for driving the lens barrel 10a to rotate, so that the lens barrel 10a moves in an axial direction relative to the fixed barrel 51, and the lens of the optical lens 10 is moved closer to or farther from the photosensitive element 20. It will be appreciated that the lens barrel 10a may be connected to the fixed base 50 in other ways and may be moved relative to the fixed base 50. For example, the lens barrel 10a and the fixed base 50 are connected by a slide rail. In some embodiments, each lens of the optical lens 10 is disposed in the lens barrel 10a and can move relative to the lens barrel 10a, so that different lenses can relatively move to perform focusing.
Referring to fig. 2 and 3 together, in some embodiments of the present application, the optical lens 10 may be a five-lens with five lenses or a six-lens with six lenses. In the embodiment shown in fig. 2 and 3, the optical lens 10 is a five-lens assembly, and the five lens assemblies include a first lens 11, a second lens 12, a third lens 13, a fourth lens 14 and a fifth lens 15, which are sequentially arranged from an object side to an image side. The first lens 11, the second lens 12, the third lens 13, the fourth lens 14 and the fifth lens 15 are all coaxially arranged, i.e. the arrangement directions of the lenses are the same. The first lens element 11, the second lens element 12, the third lens element 13, the fourth lens element 14 and the fifth lens element 15 each comprise an object-side surface facing the object side and an image-side surface facing the image side. Referring to fig. 28, fig. 28 is a schematic diagram illustrating a part of the structure of an optical lens 10 according to a seventh embodiment of the present application. In the embodiment shown in fig. 28, the optical lens 10 is a six-lens system having six lenses, and five lenses thereof include a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16 and a fifth lens 15, which are sequentially arranged from an object side to an image side. In the present embodiment, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the supplemental lens 16, and the fifth lens 15 are all coaxially disposed, that is, the arrangement directions of the lenses are the same. The first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the supplemental lens 16 and the fifth lens 15 each include an object side surface facing the object side and an image side surface facing the image side.
Each lens of the present application is a lens having positive power or negative bending force, and when a plane mirror is interposed between the lenses, the plane mirror is not considered as a lens of the optical lens 10 of the present application. For example, when a plane mirror is interposed between the first lens 11 and the second lens 12, the plane mirror cannot be counted as the second lens of the optical lens 10 of the present application.
In this embodiment, the first lens 11 has negative focal power, so that light outside the field of view can be effectively collected and converged into the optical system, which is beneficial to realizing the design of a large angle of view. In addition, in some embodiments of the present application, the optical lens 10 is applied to electronic structures such as a monitoring device, and the size of the diameter of the incident light hole of the optical lens is less limited than that of the optical lens 10 applied to structures such as a mobile phone, so that the first lens 11 can be set as a negative focal lens, and light outside the field of view can be collected and converged into the optical system more effectively than that of the first lens set as a positive focal lens. When the object measuring surface of the first lens 11 is concave at the paraxial region, the large-aperture lens can be effectively dispersed into a larger caliber, so that the correction of the spherical aberration of the large-aperture lens is facilitated, and the large-aperture design of the optical lens 10 is facilitated. It is understood that in some embodiments of the present application, the object side surface of the first lens element 11 may be convex at the paraxial region.
The second lens 12 has positive focal power, which is beneficial to converging light rays with large aperture and large field of view, reducing the aperture of the lens, and further beneficial to realizing the large aperture design of the optical lens 10. In some embodiments, the object-side and image-side surfaces of the second lens element 12 are convex at the paraxial region. It will be appreciated that in some embodiments, only one of the object-side and image-side surfaces of the second lens element 12 may be convex, and the other concave or planar.
The third lens 13 has optical power, which can effectively correct the residual aberration of the optical lens 10 and improve the imaging quality of the optical lens 10, wherein the optical power of the third lens 13 can be positive or negative. In some embodiments, the object-measuring surface of the third lens element 13 is convex at the paraxial region, and the image-side surface of the third lens element 13 is concave at the paraxial region, so that the phase difference generated by the third lens element 13 itself can be smaller, thereby better correcting the residual aberration of the optical lens 10 and improving the imaging quality of the optical lens 10.
The fourth lens element 14 has positive focal power, and can bear the main focal power of the optical lens 10, so as to facilitate the improvement of the aperture of the optical lens 10, and further facilitate the realization of a large aperture design of the optical lens 10. In some embodiments, the object-side and image-side surfaces of the second lens element 12 are convex at the paraxial region. It will be appreciated that in some embodiments, only one of the object-side and image-side surfaces of the second lens element 12 may be convex, and the other concave or planar.
The fifth lens 15 has negative optical power, and the fifth lens 15 is an M-shaped lens, that is, the cross section of the fifth lens 15 cut through the plane passing through the optical axis is M-shaped. In other words, at least one inflection point exists on at least one of the object-side surface and the image-side surface of the fifth lens element 15, which is beneficial to improving the chief ray incident angle of the lens assembly by utilizing the characteristic of the M-shape of the fifth lens element 15, and further beneficial to realizing the design of a large chief ray incident angle. The object side surface of the fifth lens element 15 may be concave or convex at the paraxial region, and the image side surface thereof may be concave at the paraxial region, so as to better enhance the incident angle of the chief ray of the optical lens assembly. It will be appreciated that in some embodiments, or alternatively, the image side of the fifth lens 15 may be convex.
The power of the supplemental lens 16 can be positive or negative, and both the object-side and image-side surfaces can be convex or concave at the paraxial region. The supplemental lens 16 is disposed between the fourth lens 14 and the fifth lens 15, so as to effectively correct the residual aberration of the system and improve the imaging quality of the optical lens 10. That is, in the present application, the optical lens 10 of the six-piece lens has more light compensating lenses 16 than the optical lens 10 of the five-piece lens, and the residual aberration of the optical lens 10 can be reduced by the light compensating lenses 16, so that better imaging quality can be achieved.
In this embodiment, the lenses with different structures and different powers are mutually matched, so that the optical lens 10 with the performances of small aperture f# value, large chief ray incidence angle, large field angle and the like can be obtained, and the optical lens 10 can meet various use scenes and various use demands. For example, since the optical lens 10 has a smaller f# value for the optical circle (i.e., has a large aperture or an oversized aperture), the optical lens 10 is able to receive more light energy, so that the optical lens 10 can image clearly even in a low-illuminance environment. Since the optical lens 10 has a large chief ray incidence angle, the optical lens 10 of the present application can match the photosensitive element of the large chief ray incidence angle. Since the optical lens 10 has a large field angle, a wider range of scenes can be photographed. When the electronic equipment is monitoring equipment, the lens module included in the electronic equipment can have the characteristics of large aperture, high resolution, large angle of view and the like, so that the monitoring equipment can monitor a larger visual field range, and the monitoring dead angle is reduced. And moreover, clear shooting can be performed under the condition of dark illumination, and operations such as large-magnification amplification can be performed on imaging, so that the requirements of actual use are better met. In addition, in the present embodiment, the number of lenses of the optical lens 10 is five or six, that is, the number of optical lenses of the present application is small, and the optical lens 10 can have a small total optical length by matching the structure and the optical power of the optical lens 10.
In the embodiments of the present application, each lens of the optical lens 10 may be made of plastic, glass, or other composite materials. Wherein, the plastic material can easily prepare various optical lens structures with complex shapes. The refractive index n1 of the glass lens satisfies: 1.50.ltoreq.n1.ltoreq.1.90, which is larger in the selectable range of refractive index than the refractive index range (1.55-1.65) of the plastic lens, and a thinner glass lens with better performance is easier to obtain, which is beneficial to reducing the on-axis thickness TTL1 of a plurality of lenses of the optical lens 10, and further reducing the optical length TTL of the optical lens 10. Therefore, in some embodiments of the present application, the manufacturing cost, efficiency and optical effect are considered, and the specific application materials of different lenses are reasonably selected according to the needs. In some embodiments of the present application, each lens of the optical lens 10 is made of a plastic material and a glass material, so that the manufacturing cost of the optical lens 10 is reduced while the optical lens 10 can have a small optical length. In addition, the refractive index of the glass lens satisfies dn/dT >0 along with the temperature change, and the refractive index of the plastic lens satisfies dn/dT < 0 along with the temperature change, so that the optimal image plane drift of the optical lens 10 caused by environmental change can be corrected by utilizing the temperature characteristics of the glass lens and the plastic lens, and the optical lens 10 can be clearly imaged in a full temperature range from at least minus 40 ℃ to +85 ℃ without focusing by a motor or the like.
In some embodiments of the present application, at least one of the second lens 12 and the fourth lens 14 in the optical lens 10 is a glass lens, and the other lenses of the optical lens 10 are plastic lenses. For example, the optical lens 10 is a five-lens type lens including five lenses, wherein the second lens 12 is a glass lens, and the first lens 11, the third lens 13, the fourth lens 14 and the fifth lens 15 are all plastic lenses. Alternatively, the second lens 12 and the fourth lens 14 are glass lenses, and the first lens 11, the third lens 13 and the fifth lens 15 are plastic lenses. In the present embodiment, since the second lens 12 and the fourth lens 14 are both lenses having positive power, at least one of the second lens 12 and the fourth lens 14 is made of a glass material, and thus correction of the optimum image plane shift of the optical lens 10 can be more preferably achieved. The object-side and image-side surfaces of the second lens element 12 are convex at the paraxial region, and the object-side and image-side surfaces of the fourth lens element 14 are convex at the paraxial region. When the second lens element 12 and/or the fourth lens element 14 are/is glass, the object-side surface and the image-side surface of the second lens element 12 and/or the fourth lens element 14 are convex at the paraxial region, so that the dn/dT of the second lens element 12 and/or the fourth lens element 14 can be larger, and the second lens element 12 or the fourth lens element 14 can have better effect of correcting the temperature drift of the optical lens. Wherein the second lens 12 and/or the fourth lens 14 includes the second lens 12 or the fourth lens, or three cases of the second lens 12 and the fourth lens 14. For example, when the second lens element 12 is a glass lens element and both the object-side surface and the image-side surface of the second lens element 12 are convex at the paraxial region, the value of dn/dT of the second lens element 12 is larger, so that the second lens element 12 can have better effect of correcting the temperature drift of the optical lens.
In some embodiments of the present application, the aperture value f# of the optical lens 10 satisfies: f# is more than or equal to 0.8 and less than or equal to 2.8. That is, the aperture to value f# of the optical lens of the present application can be smaller, so as to cover the application requirement of the large aperture in the market, and achieve the purpose of providing a large aperture lens, so that the optical lens 10 can have a better shooting effect even under the condition of insufficient illuminance.
In some embodiments, the relationship between the effective focal length EFFL of the optical lens 10 and the total optical length TTL of the optical lens 10 satisfies: 0.2. Ltoreq. EFFL/TTL. Ltoreq.0.9, for example, EFFL/TTL may be 0.5, 0.8. In the embodiment of the present application, when the optical lens 10 satisfies the above relationship, the optical lens 10 can have a smaller total optical length, so that the optical lens 10 can have a miniaturized characteristic, and is better suitable for use in miniaturized electronic devices. The EFL, TTL, EFL/TTL representations appearing at each position in the application have the same meaning, and are not described in detail later. It is understood that in other embodiments of the present application, EFFL/TTL can be slightly less than 0.2, such as 0.19, 0.18, etc.; alternatively, the TTL/EFL may be slightly greater than 0.9, such as 0.95, 1.0, etc.
In some embodiments, the relationship between the effective focal length EFFL of the optical lens 10 and the maximum image height IH of the optical lens 10 satisfies: EFFL/IH is more than or equal to 0.4 and less than or equal to 2.0. In the present embodiment, when the optical lens 10 satisfies the above relationship, the optical lens 10 can be realized to have a large image height, so that the optical lens 10 can have characteristics of a large field of view and high pixels. It is understood that in other embodiments of the present application, EFFL/IH may also be slightly less than 0.4, such as 0.35, 0.3, etc.; or EFFL/IH may be slightly greater than 2.0, such as 2.5, 3.0, etc.
In some embodiments, the relationship between the effective focal length EFFL, the aperture value f# and the total optical length TTL of the optical lens 10 satisfies: EFFL/(F#. Times.TTL) of 0.1 to 0.5. In the present embodiment, when the optical lens 10 satisfies the above relationship, the values of f#, TTL may be small, that is, the optical lens 10 may have both the characteristics of a large aperture and miniaturization. It is understood that in other embodiments of the present application, EFFL/(F#. Times.TTL) may also be slightly less than 0.1, such as 0.09, 0.08, etc.; or EFFL/(F#. Times.TTL) may be slightly greater than 0.5, e.g., 0.55, 0.65, etc.
In some embodiments, the relationship between the effective focal length EFFL, the total optical length TTL, the maximum image height IH of the optical lens 10 and the F-number F# of the optical lens 10 satisfies: (IH×EFFL)/(F# ×TTL2) is less than or equal to 0.3. In the present embodiment, when the optical lens 10 satisfies the above relation, the values of f#, TTL are small, and the value of IH is large, so that the optical lens 10 can have the characteristics of a large aperture, a small size, a large angle of view, and a high pixel. It is understood that in other embodiments of the present application, (IH x EFFL)/(F#. Times.TTL2) may be slightly greater than 0.3, such as 0.35, 0.4, etc.
In some embodiments, the field angle FOV of the optical lens 10 is 40 ° or less and 140 ° or less, that is, in the embodiments of the present application, the variation range of the field angle FOV of the optical lens 10 may be large, so that the optical lens 10 with any field angle may be designed according to actual needs. In some embodiments of the present application, the field angle of the optical lens 10 can reach 140 ° at maximum, so that the optical lens 10 can have a larger shooting field of view.
In the present application, by reasonably setting parameters (including materials, on-axis thickness, surface parameters, etc.) of each lens in each component, the optical power of each component is reasonably distributed, so as to optimize optical parameters such as focal length, abbe number, etc. of each component, thereby enabling the optical lens 10 to have performances such as small aperture f# value, large chief ray incident angle, large field angle, etc. at the same time. Specifically, in some embodiments of the present application, the focal length f of the fourth lens 14 4 The relationship with the focal length EFFL of the optical lens 10 satisfies: f is more than or equal to 0.5 4 EFFL is less than or equal to 2.0. In the present embodiment, since the fourth lens 14 takes on the main power of the optical lens 10, the focal length f of the fourth lens 14 4 When the above relationship is satisfied with the focal length EFFL of the optical lens 10, the design of a large aperture can be more easily realized.
In some embodiments, the abbe number v2 of the second lens 12 and the abbe number v3 of the third lens 13 satisfy the relationship: the I v2-v 3I is more than or equal to 15. When the abbe number v2 of the second lens element 12 and the abbe number v3 of the third lens element 13 satisfy the above relationship, the third lens element 13 can more easily achieve the purpose of correcting chromatic aberration, improve the imaging quality of the optical lens 10, and enhance the resolving power of the optical lens 10.
In some embodiments, the abbe number v4 of the fourth lens 14 and the abbe number v3 of the third lens 13 satisfy the relationship: the V4-V3I is more than or equal to 15. When the abbe number v4 of the fourth lens 14 and the abbe number v3 of the third lens 13 satisfy the above relationship, the third lens 13 can more easily achieve the purpose of correcting chromatic aberration, further improve the imaging quality of the optical lens 10, and enhance the resolving power of the optical lens 10.
When the optical lens 10 is a six-piece lens, the optical lens 10 satisfies the relationship: v4-v5 is not less than 15, wherein v4 is the Abbe number of the fourth lens 14; v5 is the abbe number of the fifth lens from the object side to the image side of the optical lens 10, and v5 is the abbe number of the supplemental lens 16 for the six-piece optical lens 10 of the present application. In the present embodiment, when the abbe number of the supplemental lens 16 and the abbe number of the fourth lens satisfy the above relationship, the supplemental lens 16 can more easily achieve the purpose of correcting the chromatic aberration.
In some embodiments, when the image side and the object side of each lens are aspheric, and each lens satisfies the formula:
wherein z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, c is the curvature of the aspheric apex sphere, K is the conic constant, a i Is an aspherical coefficient, and ρ is a normalized axial coordinate.
By the above relation, lenses with different aspherical surfaces are obtained, so that different optical effects can be realized by different lenses, and the optical lens 10 with the required performance can be obtained by matching different aspherical lenses.
According to the given relation and range in some embodiments of the present application, through the cooperation between different lenses, the optical lens 10 can have the performances of a small aperture f# value, a large chief ray incidence angle, a large field angle and the like at the same time, so that the optical lens 10 can meet various use scenes and various use requirements. Meanwhile, a better imaging effect can be obtained.
Some specific, but non-limiting examples of embodiments of the present application are described in more detail below in conjunction with fig. 4-24.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a part of the structure of an optical lens 10 according to a first embodiment of the present application. In the present embodiment, the optical lens 10 is a five-lens type lens, and includes five lenses, namely, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15 in order from an object side to an image side. The first lens element 11 has a negative refractive power, a concave object-side surface at a paraxial region thereof, and a convex image-side surface at a paraxial region thereof. The second lens element 12 has a positive refractive power and is convex at the paraxial region. The third lens element 13 has a negative refractive power, and an object-side surface thereof is convex at a paraxial region thereof and an image-side surface thereof is concave at a paraxial region thereof. The fourth lens element 14 is a positive lens element with a glass material, and has a convex object-side surface at a paraxial region thereof. The fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is concave at a paraxial region thereof, and the image-measuring surface is concave at the paraxial region thereof. The fourth lens 14 is a glass lens, and the other lenses (including the first lens 11, the second lens 12, the third lens 13, and the fifth lens 15) are all plastic lenses.
The design parameters of the first embodiment of the present application are shown in table 1 below.
Table 1 basic parameters of the optical lens 10 of the first embodiment
Focal length EFFL | 6.44mm |
F# | 2.0 |
FOV | 94° |
IH | 9.5mm |
Total optical length TTL | 11mm |
EFFL/TTL | 0.585 |
EFFL/IH | 0.678 |
EFFL/(F#×TTL) | 0.293 |
(IH×EFFL)/(F#×TTL2) | 0.253 |
f4/EFFL | 0.74 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meanings of the respective symbols in the table are as follows.
EFFL: an effective focal length of the optical lens 10.
F#: the aperture value is a relative value (reciprocal of relative aperture) obtained from the focal length of the lens and the light passing diameter of the lens, and the smaller the aperture F value is, the more the amount of light is entered in the same unit time.
FOV: angle of view of the optical lens 10.
TTL: the optical total length of the optical lens 10.
IH: the optical lens 10 has a maximum imaging height.
f 4 : focal length of fourth lens element from object side to image side of optical lens 10, pair ofFor the purposes of this application, the focal length of the fourth lens 14 is indicated.
v2: the abbe number of the second lens from the object side to the image side of the optical lens 10, for the purposes of this application, indicates the abbe number of the second lens 12.
v3: the abbe number of the third lens element from the object side to the image side of the optical lens 10, for the purposes of this application, indicates the abbe number of the third lens element 13.
v4: the abbe number of the fourth lens element from the object side to the image side of the optical lens 10, for the purposes of this application, indicates the abbe number of the fourth lens element 14.
Note that, in this application, the symbols of TTL, EFFL, F #, FOV, IH, f4, v2, v3, v4, etc. have the same meaning, and will not be described again when they appear again later.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 2.0, an overall optical length TTL of 11mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain the optical lens 10 having the optical basic parameters in table 1, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 1. Referring to tables 2 and 3, table 2 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 according to the embodiment of the present application, and table 3 shows surface coefficients of each lens in the optical lens 10 according to the embodiment of the present application.
Table 2 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the first embodiment
In the above table, the meanings of the respective symbols in the table are as follows.
R1: the optical lens 10 has a radius of curvature at a paraxial of an object side surface of a first lens from an object side to an image side. For the purposes of this application, the radius of curvature at the paraxial of the object side of the first lens 11 is represented. Wherein the paraxial region is the region near the optical axis of the lens.
R2: the optical lens 10 has a radius of curvature at a paraxial region of an image side surface of a first lens from an object side to an image side. For the purposes of this application, the radius of curvature at the paraxial of the image side of the first lens 11 is represented.
R3: the radius of curvature at the paraxial of the object side of the second lens from the object side to the image side of the optical lens 10. For purposes of this application, the radius of curvature at the paraxial of the object side of the second lens 12 is represented.
R4: the radius of curvature at the paraxial side of the second lens from the object side to the image side of the optical lens 10. For purposes of this application, the radius of curvature at the paraxial of the image side of the second lens 12 is represented.
Stop: refers to the stop of the optical lens 10, where the Infinity means that the surface of the stop is planar.
R5: the radius of curvature at the paraxial side of the object side of the third lens from the object side to the image side of the optical lens 10. For the purposes of this application, the radius of curvature at the paraxial of the object side of the third lens 13 is represented.
R6: the radius of curvature at the paraxial side of the image side of the third lens from the object side to the image side of the optical lens 10. For the purposes of this application, the radius of curvature at the paraxial of the image side of the third lens 13 is represented.
R7: the radius of curvature at the paraxial side of the object side of the fourth lens element from the object side to the image side of the optical lens 10. For purposes of this application, the radius of curvature at the paraxial of the object side of the fourth lens 14 is represented.
R8: the radius of curvature at the paraxial region of the image side of the fourth lens element from the object side to the image side of the optical lens 10. For purposes of this application, the radius of curvature at the paraxial of the image side of the fourth lens 14 is represented.
R9: the optical lens 10 has a radius of curvature at a paraxial region of an object side surface of a fifth lens element from an object side to an image side. In the present embodiment, the radius of curvature at the paraxial region of the object side surface of the fifth lens element 15 is shown.
R10: the optical lens 10 has a radius of curvature at a paraxial region of an image side surface of a fifth lens from an object side to an image side. In the present embodiment, the curvature radius at the paraxial region of the image side surface of the fifth lens 15 is shown.
d1: on-axis thickness of the first lens from the object side to the image side of the optical lens 10. For the purposes of this application, the on-axis thickness of the first lens 11 is indicated.
d2: on-axis thickness of the second lens from the object side to the image side of the optical lens 10. For purposes of this application, the on-axis thickness of the second lens 12 is indicated.
d3: on-axis thickness of the third lens from the object side to the image side of the optical lens 10. For the purposes of this application, the on-axis thickness of the third lens 13 is indicated.
d4: on-axis thickness of the fourth lens from the object side to the image side of the optical lens 10. For purposes of this application, the on-axis thickness of the fourth lens 14 is indicated.
d5: on-axis thickness of the fifth lens from the object side to the image side of the optical lens 10. The on-axis thickness of the fifth lens 15 is shown in this embodiment.
a1: the optical lens 10 has an on-axis distance from the object side to the image side of the first lens element to the object side of the second lens element. For purposes of this application, the on-axis distance of the image side of the first lens 11 from the object side of the second lens 12 is represented.
a2: the optical lens 10 has an on-axis distance from the object side to the image side of the second lens element and the object side of the third lens element. For purposes of this application, the on-axis distance of the image side of the second lens 12 from the object side of the third lens 13 is represented.
a3: an axial distance between the image side surface of the third lens element and the object side surface of the fourth lens element from the object side to the image side of the optical lens 10. For purposes of this application, the on-axis distance of the image side of the third lens 13 from the object side of the fourth lens 14 is shown.
a4: an axial distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element from the object side to the image side of the optical lens 10. For purposes of this application, the on-axis distance of the image side of the fourth lens element 14 from the object side of the fifth lens element 15 is shown.
a5: an on-axis distance from an image side surface of a fifth lens from an object side to an image side of the optical lens 10 to an object side surface of a lens adjacent to the image side surface of the fifth lens or an object side surface of the infrared filter 30. In the present embodiment, the optical lens 10 is a five-lens type lens, the fifth lens is a fifth lens 15, and the image side surface of the fifth lens 15 is adjacent to the infrared filter 30, so in the present embodiment, a5 represents the axial distance between the image side surface of the fifth lens 15 and the object side surface of the infrared filter 30.
n1: refractive index of the first lens from the object side to the image side of the optical lens 10. For the purposes of this application, the refractive index of the first lens 11 is indicated.
n2: refractive index of the second lens from the object side to the image side of the optical lens 10. For purposes of this application, the refractive index of the second lens 12 is indicated.
n3: refractive index of the third lens from the object side to the image side of the optical lens 10. For the purposes of this application, the refractive index of the third lens 13 is indicated.
n4: refractive index of the fourth lens element from the object side to the image side of the optical lens 10. For purposes of this application, the refractive index of the fourth lens 14 is indicated.
n5: refractive index of the fifth lens from the object side to the image side of the optical lens 10. The refractive index of the fifth lens 15 is shown in this embodiment.
v1: refractive index of the first lens from the object side to the image side of the optical lens 10. For the purposes of this application, the abbe number of the first lens 11 is indicated.
v2: abbe number of the second lens from the object side to the image side of the optical lens 10. For the purposes of this application, the abbe number of the second lens 12 is indicated.
v3: abbe number of the third lens from the object side to the image side of the optical lens 10. For the purposes of this application, the abbe number of the third lens 13 is indicated.
v4: abbe number of the fourth lens from the object side to the image side of the optical lens 10. For the purposes of this application, the abbe number of the fourth lens 14 is indicated.
v5: abbe number of the fifth lens from the object side to the image side of the optical lens 10. The abbe number of the fifth lens 15 is shown in the present embodiment.
In this application, unless otherwise indicated, the meanings of the symbols are the same in the following reappearance, and will not be described again.
The parameters in the table are represented by scientific counting. For example, -5.24E+00 means-5.24X100; 3.00E-01 means 3.00X 10-1. The positive and negative of the radius of curvature means that the optical surface is convex toward the object side or convex toward the image side, and when the optical surface (including the object side or the image side) is convex toward the object side, the radius of curvature of the optical surface is positive; when the optical surface (including the object side surface or the image side surface) is convex toward the image side, the optical surface is concave toward the object side surface, and the radius of curvature of the optical surface is negative.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 3.
Table 3 aspherical coefficients of the optical lens 10 of the first embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | -2.17E-01 | 3.50E-02 | -1.19E-02 | 2.38E-03 | -2.97E-04 | 2.37E-05 | -1.20E-06 | 3.67E-08 | -6.23E-10 | 4.45E-12 |
R2 | -1.45E+01 | 4.44E-02 | -1.58E-02 | 3.19E-03 | -3.73E-04 | 2.70E-05 | -1.26E-06 | 3.78E-08 | -6.65E-10 | 5.21E-12 |
R3 | -3.70E+00 | 1.28E-02 | -5.56E-03 | 2.27E-03 | -7.52E-04 | 1.97E-04 | -3.33E-05 | 3.25E-06 | -1.68E-07 | 3.59E-09 |
R4 | 2.23E+01 | -1.17E-02 | 5.63E-03 | -2.03E-03 | 6.07E-04 | -1.27E-04 | 1.72E-05 | -1.39E-06 | 6.10E-08 | -1.10E-09 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | 4.40E+00 | -3.87E-02 | 2.88E-02 | -1.44E-02 | 5.63E-03 | -1.72E-03 | 3.46E-04 | -4.06E-05 | 2.51E-06 | -6.28E-08 |
R6 | 1.36E+00 | -4.77E-02 | 3.53E-02 | -1.72E-02 | 6.88E-03 | -2.24E-03 | 4.79E-04 | -5.94E-05 | 3.85E-06 | -1.01E-07 |
R7 | -1.05E+01 | -1.05E-02 | 6.33E-03 | -2.68E-03 | 1.17E-03 | -4.21E-04 | 8.92E-05 | -1.03E-05 | 6.10E-07 | -1.44E-08 |
R8 | -9.67E-01 | -3.42E-03 | 1.77E-04 | -1.73E-05 | -1.24E-06 | 5.60E-07 | -9.50E-09 | -6.53E-09 | 6.39E-10 | -2.87E-11 |
R9 | -5.00E+01 | -7.15E-02 | 1.40E-02 | -1.59E-03 | 1.18E-05 | 3.85E-05 | -8.08E-06 | 8.50E-07 | -4.75E-08 | 1.11E-09 |
R10 | -4.99E-01 | -7.03E-02 | 1.83E-02 | -4.00E-03 | 6.44E-04 | -7.34E-05 | 5.70E-06 | -2.84E-07 | 8.22E-09 | -1.04E-10 |
Where K is a quadric constant, and symbols such as a4, a6, a8, a10, a12, a14, a16, a18, a20 represent aspherical coefficients. Note that, in this application, when symbols such as K, a, a6, a8, a10, a12, a14, a16, a18, a20 and the like are reappeared in the following, unless otherwise explained, the meaning is the same as that of the present application, and the following description is omitted.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
In the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, c is the aspheric apex sphere curvature, K is the conic constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 5 to 7c are graphs showing the optical performance of the optical lens 10 according to the first embodiment.
Specifically, fig. 5 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the first embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 5 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 5, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 6 shows a principal ray incidence angle curve of the optical lens 10 of the first embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 6 is used to characterize the curve change of chief ray incidence angle at different image heights. As can be seen from the figure, in the first embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is 38.4 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 7a is a temperature drift modulation contrast (modulation transfer function, MTF) curve of the optical lens 10 of the first embodiment at normal temperature (22 ℃); fig. 7b is a temperature drift modulation contrast curve of the optical lens 10 of the first embodiment at-30 ℃; fig. 7c is a temperature drift modulation contrast curve of the optical lens 10 of the first embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 7a, 7b, and 7c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 8, fig. 8 is a schematic diagram illustrating a part of the structure of an optical lens 10 according to a second embodiment of the present application. In the present embodiment, the optical lens 10 is a five-lens type lens, and includes five lenses, namely, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15 in order from an object side to an image side. The first lens element 11 has a negative refractive power, a concave object-side surface at a paraxial region thereof, and a convex image-side surface at a paraxial region thereof; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the object side surface of the fourth lens element 14 is convex at the paraxial region; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is concave at a paraxial region thereof, and the image-measuring surface is concave at the paraxial region thereof. The fourth lens 14 is a glass lens, and the other lenses (including the first lens 11, the second lens 12, the third lens 13, and the fifth lens 15) are all plastic lenses.
The design parameters of the second embodiment of the present application are shown in table 4 below.
Table 4 basic parameters of the optical lens 10 of the second embodiment
Focal length EFFL | 6.41mm |
F# value | 2.0 |
FOV | 94° |
IH | 9.5mm |
Total optical length TTL | 11mm |
EFFL/TTL | 0.583 |
EFFL/IH | 0.675 |
EFFL/(F#×TTL) | 0.291 |
(IH×EFFL)/(F#×TTL2) | 0.252 |
f4/EFFL | 0.73 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is shown in table 1.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 2.0, an overall optical length TTL of 11mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain the optical lens 10 having the optical basic parameters in table 4, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 4. Referring to tables 5 and 6, table 5 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 according to the embodiment of the present application, and table 6 shows surface coefficients of each lens in the optical lens 10 according to the embodiment of the present application.
Table 5 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the second embodiment
In the above table, the meaning of each symbol in the table is shown in table 2.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 6.
Table 6 aspherical coefficients of the optical lens 10 of the second embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | 3.94E-02 | 5.30E-02 | -1.73E-02 | 3.36E-03 | -4.14E-04 | 3.34E-05 | -1.74E-06 | 5.61E-08 | -1.01E-09 | 7.72E-12 |
R2 | -3.83E+01 | 6.12E-02 | -2.19E-02 | 4.37E-03 | -5.25E-04 | 4.19E-05 | -2.34E-06 | 8.87E-08 | -2.04E-09 | 2.10E-11 |
R3 | -2.78E+00 | 3.14E-02 | -1.76E-02 | 8.03E-03 | -2.79E-03 | 6.91E-04 | -1.10E-04 | 1.05E-05 | -5.41E-07 | 1.17E-08 |
R4 | 5.00E+01 | -8.26E-03 | 2.27E-03 | -8.51E-04 | 3.64E-04 | -9.87E-05 | 1.52E-05 | -1.32E-06 | 5.91E-08 | -1.08E-09 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | -2.88E+01 | -1.10E-02 | 8.42E-03 | -4.19E-03 | 1.90E-03 | -6.61E-04 | 1.33E-04 | -1.46E-05 | 8.17E-07 | -1.82E-08 |
R6 | 1.91E+01 | -2.11E-02 | 1.63E-02 | -7.82E-03 | 3.50E-03 | -1.20E-03 | 2.47E-04 | -2.82E-05 | 1.65E-06 | -3.88E-08 |
R7 | -1.53E+01 | -1.30E-02 | 7.80E-03 | -3.79E-03 | 1.63E-03 | -5.12E-04 | 9.60E-05 | -1.01E-05 | 5.50E-07 | -1.21E-08 |
R8 | -8.15E-01 | -4.34E-03 | 1.86E-04 | -1.36E-05 | -2.28E-06 | 5.55E-07 | 2.13E-09 | -5.80E-09 | 3.24E-10 | -1.18E-11 |
R9 | 5.00E+01 | -7.65E-02 | 1.33E-02 | -8.95E-04 | -2.15E-04 | 8.77E-05 | -1.50E-05 | 1.44E-06 | -7.52E-08 | 1.65E-09 |
R10 | -5.36E-01 | -7.47E-02 | 1.93E-02 | -4.26E-03 | 6.91E-04 | -7.96E-05 | 6.24E-06 | -3.15E-07 | 9.20E-09 | -1.18E-10 |
In the above table, the meaning of each symbol in the table is shown in table 3.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 9 to 11c are graphs showing the optical performance of the optical lens 10 according to the second embodiment.
Specifically, fig. 9 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the second embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 9 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 9, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 10 shows a principal ray incidence angle curve of the optical lens 10 of the second embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 10 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the second embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is up to 37.2 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 11a is a temperature drift modulation contrast curve of the optical lens 10 of the second embodiment at normal temperature (22 ℃); FIG. 11b is a temperature drift modulation contrast curve of the optical lens 10 of the second embodiment at-30 ℃; fig. 11c is a temperature drift modulation contrast curve of the optical lens 10 according to the second embodiment at +70℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 11a, 11b, and 11c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 12, fig. 12 is a schematic view illustrating a part of the structure of an optical lens 10 according to a third embodiment of the present disclosure. In the present embodiment, the optical lens 10 is a five-lens type lens, and includes five lenses, namely, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15 in order from an object side to an image side. The first lens element 11 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the fourth lens element 14 has a convex object-side surface at the paraxial region; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is concave at a paraxial region thereof, and the image-measuring surface is concave at the paraxial region thereof. The fourth lens 14 is a glass lens, and the other lenses (including the first lens 11, the second lens 12, the third lens 13, and the fifth lens 15) are all plastic lenses.
The design parameters of the third embodiment of the present application are shown in table 7 below.
Table 7 basic parameters of the optical lens 10 of the third embodiment
In the above table, the meanings of the respective symbols in the table are as follows.
EFFL: an effective focal length of the optical lens 10.
F#: the aperture value is a relative value (reciprocal of relative aperture) obtained from the focal length of the lens and the light passing diameter of the lens, and the smaller the aperture F value is, the more the amount of light is entered in the same unit time.
FOV: angle of view of the optical lens 10.
TTL: the total optical length of the optical lens 10, TTL, is the sum of the back focal length BFL of the optical lens 10 and the on-axis thickness TTL1 of the multiple lenses of the optical lens 10.
IH: the optical lens 10 has a maximum imaging height.
f 4 : focal length of the fourth lens 14.
v2: abbe number of the second lens 12.
v3: abbe number of the third lens 13.
v4: abbe number of the fourth lens 14.
In the present application, TTL, EFFL, F #, FOV, IH, f 4 The symbols of v2, v3, v4, etc. have the same meaning, and will not be described again in the subsequent process.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 2.0, an overall optical length TTL of 11.5mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain the optical lens 10 having the optical basic parameters in table 7, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 7. Referring to tables 8 and 9, table 8 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 according to the embodiment of the present application, and table 9 shows surface coefficients of each lens in the optical lens 10 according to the embodiment of the present application.
Table 8 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the third embodiment
In the above table, the meaning of each symbol in the table is shown in table 2.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 9.
Table 9 aspherical coefficients of optical lens 10 of the third embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | 1.11E+00 | 1.74E-02 | -4.31E-03 | 6.70E-04 | -6.97E-05 | 4.89E-06 | -2.22E-07 | 6.12E-09 | -9.27E-11 | 5.89E-13 |
R2 | -1.06E+01 | 5.63E-03 | 1.95E-03 | -1.33E-03 | 3.61E-04 | -5.24E-05 | 4.38E-06 | -2.12E-07 | 5.47E-09 | -5.88E-11 |
R3 | -4.24E+00 | 9.89E-04 | 2.32E-03 | -3.51E-04 | -1.77E-04 | 1.05E-04 | -2.28E-05 | 2.51E-06 | -1.39E-07 | 3.12E-09 |
R4 | 1.71E+01 | -8.25E-03 | 3.30E-03 | -9.24E-04 | 2.33E-04 | -4.42E-05 | 5.53E-06 | -4.18E-07 | 1.70E-08 | -2.83E-10 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | 4.17E+01 | -3.38E-02 | 2.39E-02 | -1.13E-02 | 4.20E-03 | -1.22E-03 | 2.36E-04 | -2.65E-05 | 1.57E-06 | -3.79E-08 |
R6 | 2.06E+00 | -4.32E-02 | 3.04E-02 | -1.38E-02 | 5.05E-03 | -1.47E-03 | 2.82E-04 | -3.17E-05 | 1.88E-06 | -4.53E-08 |
R7 | -9.09E+00 | -9.04E-03 | 5.62E-03 | -2.03E-03 | 6.65E-04 | -1.74E-04 | 2.80E-05 | -2.52E-06 | 1.17E-07 | -2.18E-09 |
R8 | -1.74E+00 | -3.15E-03 | 1.56E-04 | -1.10E-05 | -1.93E-06 | 5.39E-07 | 2.16E-09 | -6.26E-09 | 4.38E-10 | -1.53E-11 |
R9 | -5.00E+01 | -6.50E-02 | 1.20E-02 | -1.14E-03 | -1.14E-04 | 6.76E-05 | -1.25E-05 | 1.25E-06 | -6.71E-08 | 1.51E-09 |
R10 | -4.94E-01 | -6.54E-02 | 1.63E-02 | -3.44E-03 | 5.34E-04 | -5.89E-05 | 4.44E-06 | -2.16E-07 | 6.09E-09 | -7.58E-11 |
In the above table, the meaning of each symbol in the table is shown in table 3.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
In the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, c is the aspheric apex sphere curvature, K is the conic constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 13 to 15c are graphs showing the optical performance of the optical lens 10 according to the third embodiment.
Specifically, fig. 13 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the third embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 13 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 13, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 14 shows a principal ray incidence angle curve of the optical lens 10 of the third embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 14 is used to characterize the curve change of chief ray incidence angle at different image heights. As can be seen from the figure, in the third embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 reaches 38.2 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 15a is a temperature drift modulation contrast curve of the optical lens 10 of the third embodiment at normal temperature (22 ℃); fig. 15b is a temperature drift modulation contrast curve of the optical lens 10 of the third embodiment at-30 ℃; fig. 15c is a temperature drift modulation contrast curve of the optical lens 10 according to the third embodiment at +70℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 15a, 15b, and 15c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 16, fig. 16 is a schematic view illustrating a part of the structure of an optical lens 10 according to a fourth embodiment of the present disclosure. In the present embodiment, the optical lens 10 is a five-lens type lens, and includes five lenses, namely, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15 in order from an object side to an image side. The first lens element 11 has a negative refractive power, a concave object-side surface at a paraxial region thereof, and a convex image-side surface at a paraxial region thereof; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the fourth lens element 14 has a convex object-side surface at the paraxial region; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is concave at a paraxial region thereof, and the image-measuring surface is concave at the paraxial region thereof. The fourth lens 14 is a glass lens, and the other lenses (including the first lens 11, the second lens 12, the third lens 13, and the fifth lens 15) are all plastic lenses.
The design parameters of the fourth embodiment of the present application are shown in table 10 below.
Table 10 basic parameters of the optical lens 10 of the fourth embodiment
In the above table, the meanings of the respective symbols in the table are as follows.
EFFL: an effective focal length of the optical lens 10.
F#: the aperture value is a relative value (reciprocal of relative aperture) obtained from the focal length of the lens and the light passing diameter of the lens, and the smaller the aperture F value is, the more the amount of light is entered in the same unit time.
FOV: angle of view of the optical lens 10.
TTL: the total optical length of the optical lens 10, TTL, is the sum of the back focal length BFL of the optical lens 10 and the on-axis thickness TTL1 of the multiple lenses of the optical lens 10.
IH: the optical lens 10 has a maximum imaging height.
f4: focal length of the fourth lens 14.
v2: abbe number of the second lens 12.
v3: abbe number of the third lens 13.
v4: abbe number of the fourth lens 14.
In the present application, TTL, EFFL, F #, FOV, IH, f 4 The symbols of v2, v3, v4, etc. have the same meaning, and will not be described again in the subsequent process.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 2.0, an overall optical length TTL of 13.1mm, an ih of 9.5mm, and a fov of 119 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time. In this embodiment, the optical overall length of the optical lens 10 is increased by an appropriate amount as compared with the first embodiment, so that the angle of view of the optical lens 10 of this embodiment is made larger, and a larger field of view can be obtained by photographing.
In order to obtain the optical lens 10 having the optical basic parameters in table 10, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 10. Referring to table 11 and table 12, table 11 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 12 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 11 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the fourth embodiment
In the above table, the meaning of each symbol in the table is shown in table 2.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 12.
Table 12 aspherical coefficient of optical lens 10 of the fourth embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | -4.95E-01 | 1.36E-02 | -1.71E-03 | 1.89E-04 | -1.71E-05 | 1.12E-06 | -4.79E-08 | 1.19E-09 | -1.32E-11 | 8.07E-15 |
R2 | -2.16E+01 | 2.08E-02 | -2.32E-03 | 1.90E-04 | 1.67E-05 | -1.14E-05 | 2.23E-06 | -2.31E-07 | 1.26E-08 | -2.85E-10 |
R3 | -2.79E+00 | 1.46E-02 | -2.61E-03 | 8.50E-04 | -2.72E-04 | 8.36E-05 | -2.17E-05 | 3.93E-06 | -4.17E-07 | 1.88E-08 |
R4 | 3.82E+00 | 2.86E-03 | -1.20E-03 | 1.04E-03 | -5.79E-04 | 2.04E-04 | -4.50E-05 | 5.67E-06 | -3.44E-07 | 7.05E-09 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | -1.55E+01 | -1.83E-02 | 2.27E-02 | -5.09E-02 | 7.88E-02 | -7.69E-02 | 4.66E-02 | -1.71E-02 | 3.47E-03 | -3.00E-04 |
R6 | 1.41E+00 | -3.06E-02 | 3.89E-02 | -7.42E-02 | 1.10E-01 | -1.05E-01 | 6.29E-02 | -2.30E-02 | 4.70E-03 | -4.12E-04 |
R7 | -5.23E+00 | -1.05E-02 | 2.28E-02 | -4.16E-02 | 5.34E-02 | -4.26E-02 | 2.09E-02 | -6.12E-03 | 9.77E-04 | -6.52E-05 |
R8 | -1.89E+00 | -2.73E-03 | 2.29E-04 | -6.83E-06 | -1.14E-06 | 5.18E-07 | -1.24E-08 | -6.57E-09 | 6.61E-10 | -2.05E-11 |
R9 | -4.24E+01 | -6.17E-02 | 1.07E-02 | -2.37E-03 | 6.93E-04 | -1.55E-04 | 2.27E-05 | -2.04E-06 | 1.03E-07 | -2.24E-09 |
R10 | -5.37E-01 | -6.11E-02 | 1.39E-02 | -2.95E-03 | 4.92E-04 | -6.02E-05 | 5.09E-06 | -2.78E-07 | 8.75E-09 | -1.21E-10 |
In the above table, the meaning of each symbol in the table is shown in table 3.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
In the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 17 to 19c are graphs showing the optical performance of the optical lens 10 according to the fourth embodiment.
Specifically, fig. 17 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the fourth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 17 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 17, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 18 shows a principal ray incidence angle curve of the optical lens 10 of the fourth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 18 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the fourth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is 42.3 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 19a is a temperature drift modulation contrast curve of the optical lens 10 of the fourth embodiment at normal temperature (22 ℃); fig. 19b is a temperature drift modulation contrast curve of the optical lens 10 of the fourth embodiment at-30 ℃; fig. 19c is a temperature drift modulation contrast curve of the optical lens 10 of the fourth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 19a, 19b, and 19c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 20, fig. 20 is a schematic view illustrating a part of the structure of an optical lens 10 according to a fifth embodiment of the present application. In the present embodiment, the optical lens 10 is a five-lens type lens, and includes five lenses, namely, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15 in order from an object side to an image side. The first lens element 11 has a negative refractive power, a concave object-side surface at a paraxial region thereof, and a convex image-side surface at a paraxial region thereof; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the object side surface of the fourth lens element 14 is convex at the paraxial region; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is concave at a paraxial region thereof, and the image-measuring surface is concave at the paraxial region thereof. The fourth lens 14 is a glass lens, and the other lenses (including the first lens 11, the second lens 12, the third lens 13, and the fifth lens 15) are all plastic lenses.
The design parameters of the fifth embodiment of the present application are shown in table 13 below.
Table 13 basic parameters of the optical lens 10 of the fifth embodiment
In the above table, the meaning of each symbol in the table is shown in table 1.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 2.0, an overall optical length TTL of 7.0mm, an ih of 4.6mm, and a fov of 40 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time. Compared to the first embodiment, the present embodiment has a smaller optical overall length of the optical lens 10, and can be used in a miniaturized electronic device.
In order to obtain the optical lens 10 having the optical basic parameters in table 13, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 13. Referring to table 14 and table 15, table 14 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 15 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 14 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the fifth embodiment
In the above table, the meaning of each symbol in the table is shown in table 2.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 15.
Table 15 aspherical coefficients of optical lens 10 of the fifth embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | 1.16E+01 | -2.55E-02 | 1.07E-02 | -1.62E-03 | 1.28E-04 | -5.73E-06 | 1.40E-07 | -1.55E-09 | -3.11E-14 | 9.94E-14 |
R2 | -1.02E+01 | -4.23E-03 | 5.90E-03 | -8.81E-04 | 4.53E-06 | 1.10E-05 | -1.24E-06 | 6.22E-08 | -1.54E-09 | 1.52E-11 |
R3 | -4.12E+00 | 1.69E-02 | -1.25E-02 | 1.01E-02 | -4.18E-03 | 8.87E-04 | -1.04E-04 | 6.93E-06 | -2.44E-07 | 3.55E-09 |
R4 | 3.05E+01 | 8.11E-02 | -1.25E-01 | 8.94E-02 | -3.81E-02 | 9.94E-03 | -1.58E-03 | 1.49E-04 | -7.61E-06 | 1.63E-07 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | 5.00E+01 | 1.49E-01 | -1.61E-01 | 9.69E-02 | -4.03E-02 | 1.09E-02 | -1.81E-03 | 1.81E-04 | -9.92E-06 | 2.29E-07 |
R6 | -2.16E+00 | 5.36E-02 | -5.85E-02 | 2.96E-02 | -1.44E-02 | 4.79E-03 | -9.28E-04 | 1.02E-04 | -5.90E-06 | 1.42E-07 |
R7 | -3.70E+01 | -1.23E-02 | -9.77E-03 | 9.71E-03 | -9.28E-03 | 3.93E-03 | -8.27E-04 | 9.27E-05 | -5.33E-06 | 1.24E-07 |
R8 | 1.85E+01 | -3.08E-02 | 2.09E-03 | -4.57E-04 | -3.02E-04 | -5.08E-05 | 2.65E-05 | 2.73E-05 | 9.42E-06 | -6.71E-06 |
R9 | -5.00E+01 | -7.09E-02 | 4.33E-03 | -4.52E-03 | 1.56E-03 | -5.71E-05 | -4.31E-05 | 7.54E-06 | -4.95E-07 | 1.18E-08 |
R10 | -4.44E+01 | -9.82E-03 | -1.46E-02 | 7.05E-03 | -1.94E-03 | 3.28E-04 | -3.20E-05 | 1.75E-06 | -5.00E-08 | 5.83E-10 |
In the above table, the meaning of each symbol in the table is shown in table 3.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 21 to 23c are graphs showing the optical performance of the optical lens 10 according to the fifth embodiment.
Specifically, fig. 21 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the fifth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 21 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 21, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 22 shows a principal ray incidence angle curve of the optical lens 10 of the fifth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 22 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the fifth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 reaches 27.8 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 23a is a temperature drift modulation contrast curve of the optical lens 10 of the fifth embodiment at normal temperature (22 ℃); fig. 23b is a temperature drift modulation contrast curve of the optical lens 10 of the fifth embodiment at-30 ℃; fig. 23c is a temperature drift modulation contrast curve of the optical lens 10 of the fifth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 23a, 23b, and 23c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 24, fig. 24 is a schematic view showing a part of the structure of an optical lens 10 according to a sixth embodiment of the present application. In the present embodiment, the optical lens 10 is a five-lens type lens, and includes five lenses, namely, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15 in order from an object side to an image side. The first lens element 11 has a negative refractive power, a concave object-side surface at a paraxial region thereof, and a convex image-side surface at a paraxial region thereof; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the fourth lens element 14 has a convex object-side surface at the paraxial region; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is concave at a paraxial region thereof, and the image-measuring surface is concave at the paraxial region thereof. The second lens 12 is a glass lens, and the other lenses (including the first lens 11, the fourth lens 14, the third lens 13, and the fifth lens 15) are all plastic lenses.
The design parameters of the sixth embodiment of the present application are shown in table 16 below.
Table 16 basic parameters of the optical lens 10 of the sixth embodiment
Focal length EFFL | 5.82mm |
F# value | 2.0 |
FOV | 94° |
IH | 9.5mm |
Total optical length TTL | 10.5mm |
EFFL/TTL | 0.554 |
EFFL/IH | 0.613 |
EFFL/(F#×TTL) | 0.277 |
(IH×EFFL)/(F#×TTL2) | 0.279 |
f4/EFFL | 0.877 |
|v2-v3| | 29.2 |
|v4-v3| | 36.5 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is shown in table 1.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 2.0, an overall optical length TTL of 10.5mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain the optical lens 10 having the optical basic parameters in table 16, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 16. Referring to table 17 and table 18, table 17 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 18 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 17 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the sixth embodiment
In the above table, the meaning of each symbol in the table is shown in table 2.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 18.
Table 18 aspherical coefficient of optical lens 10 of the sixth embodiment
In the above table, the meaning of each symbol in the table is shown in table 3.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 25 to 27c are graphs showing the optical performance of the optical lens 10 according to the sixth embodiment.
Specifically, fig. 25 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the sixth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 25 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 25, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 26 shows a principal ray incidence angle curve of the optical lens 10 of the sixth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 26 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the sixth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 reaches 27.8 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 27a is a temperature drift modulation contrast curve of the optical lens 10 of the sixth embodiment at normal temperature (22 ℃); fig. 27b is a temperature drift modulation contrast curve of the optical lens 10 of the sixth embodiment at-30 ℃; fig. 27c is a temperature drift modulation contrast curve of the optical lens 10 of the sixth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 27a, 27b and 27c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 28, fig. 28 is a schematic diagram illustrating a part of the structure of an optical lens 10 according to a seventh embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a negative refractive power, a concave object-side surface at a paraxial region thereof, and a convex image-side surface at a paraxial region thereof; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is convex at a paraxial region thereof and the image-side surface is concave at a paraxial region thereof. The fourth lens 14 is a glass lens, and the other lenses (including the first lens 11, the second lens 12, the third lens 13, the supplemental lens 16, and the fifth lens 15) are all plastic lenses.
Design parameters of the seventh embodiment of the present application are as shown in table 19 below.
Table 19 basic parameters of the optical lens 10 of the seventh embodiment
Focal length EFFL | 5.62mm |
F# value | 1.5 |
FOV | 94° |
IH | 9.5mm |
Total optical length TTL | 14mm |
EFFL/TTL | 0.40 |
EFFL/IH | 0.592 |
EFFL/(F#×TTL) | 0.267 |
(IH×EFFL)/(F#×TTL2) | 0.182 |
f4/EFFL | 0.95 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
|v4-v5| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In this application, v5 denotes the abbe number of the fifth lens from the object side to the image side of the optical lens 10. In the present embodiment, since the optical lens 10 is a six-piece lens and the fifth lens from the object side to the image side of the optical lens 10 is a supplementary lens, v5 in the present embodiment represents the abbe number of the supplementary lens 16. The meaning of each of the other symbols in the table is shown in table 1.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 1.5, an overall optical length TTL of 14mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain the optical lens 10 having the optical basic parameters in table 19, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 19. Referring to table 20 and table 21, table 20 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 21 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 20 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the seventh embodiment
In the present application, R9 represents a radius of curvature at a paraxial of an object side of a fifth lens from an object side to an image side of the optical lens 10; r10 denotes a radius of curvature of the optical lens 10 at a paraxial region of an image side of a fifth lens from an object side to an image side. In the present embodiment, since the optical lens 10 is a six-piece lens, and the fifth lens from the object side to the image side of the optical lens 10 is a supplemental lens, in the present embodiment, R9 represents a radius of curvature at the paraxial region of the object side of the supplemental lens 16, and R10 represents a radius of curvature at the paraxial region of the image side of the supplemental lens 16. R11 represents a radius of curvature of the optical lens 10 at a paraxial region of an object side of the sixth lens element from the object side to the image side; r12 represents a radius of curvature of the optical lens 10 at a paraxial region of an image side of a sixth lens from an object side to an image side. In the present embodiment, since the sixth lens element from the object side to the image side of the optical lens 10 is the fifth lens element 15, in the present embodiment, R11 represents the radius of curvature at the paraxial region of the object side surface of the fifth lens element 15, and R12 represents the radius of curvature at the paraxial region of the image side surface of the fifth lens element 15.
In this application, d5 represents the on-axis thickness of the fifth lens from the object side to the image side of the optical lens 10. In the present embodiment, since the optical lens 10 is a six-piece lens, and the fifth lens from the object side to the image side of the optical lens 10 is a supplemental lens, d5 in the present embodiment represents the on-axis thickness of the supplemental lens 16. In this application, d65 denotes an on-axis thickness of the sixth lens element from the object side to the image side of the optical lens 10. In the present embodiment, since the optical lens 10 is a six-piece lens, and the sixth lens piece from the object side to the image side of the optical lens 10 is the fifth lens piece 15, d6 in the present embodiment represents the on-axis thickness of the fifth lens piece 15.
In this application, a5 represents an on-axis distance from an image side surface of the fifth lens from the object side to the image side to an object side surface of a lens adjacent to the image side surface of the fifth lens or an object side surface of the infrared filter 30 of the optical lens 10. In the present embodiment, since the optical lens 10 is a six-piece lens, the fifth lens piece from the object side to the image side of the optical lens 10 is the supplemental lens 16, and the image side surface of the supplemental lens 16 is adjacent to the fifth lens piece 15, in the present embodiment, a5 represents the on-axis distance between the image side surface of the on-axis lens piece and the object side surface of the fifth lens piece 15. a6 represents an on-axis distance from the image side of the sixth lens element from the object side to the image side to the object side of the lens element adjacent to the image side of the sixth lens element or the object side of the infrared filter 30. In the present embodiment, since the optical lens 10 is a six-piece lens, the sixth lens piece from the object side to the image side of the optical lens 10 is the fifth lens piece 15, and the image side surface of the fifth lens piece 15 is adjacent to the infrared filter 30, in the present embodiment, a6 represents the axial distance between the image side surface of the fifth lens piece 15 and the object side surface of the infrared filter 30.
n5 denotes a refractive index of a fifth lens from the object side to the image side of the optical lens 10. In the present embodiment, when the fifth lens element from the object side to the image side of the optical lens 10 is the supplemental lens element 16, n6 in the present embodiment represents the refractive index of the supplemental lens element 16; n6 denotes a refractive index of a sixth lens element from the object side to the image side of the optical lens 10. In the present embodiment, when the sixth lens element from the object side to the image side of the optical lens 10 is the supplemental lens element 16, n6 in the present embodiment represents the refractive index of the fifth lens element 15.
v5 denotes an abbe number of the fifth lens from the object side to the image side of the optical lens 10. In the present embodiment, v5 represents the abbe number of the supplemental lens 16 when the fifth lens from the object side to the image side of the optical lens 10 is the supplemental lens 16. v6 denotes an abbe number of the sixth lens element from the object side to the image side of the optical lens 10. In the present embodiment, when the sixth lens element from the object side to the image side of the optical lens 10 is the supplemental lens element 16, v6 in the present embodiment represents the abbe number of the fifth lens element 15.
Note that, in the above table, except for R9, R10, R11, R12, d5, d6, a5, a6, n5, n6, v5, v6, the meanings of the other symbols are the same as those in table 2, and the specific symbol meanings refer to table 2, and are not repeated here.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 21.
Table 21 aspherical coefficients of optical lens 10 of the seventh embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | -3.12E-01 | 1.50E-02 | -1.83E-03 | 1.87E-04 | -1.47E-05 | 8.33E-07 | -3.27E-08 | 8.27E-10 | -1.20E-11 | 7.57E-14 |
R2 | -5.00E+01 | 1.65E-02 | -1.39E-03 | 2.59E-05 | 1.68E-05 | -3.13E-06 | 2.85E-07 | -1.48E-08 | 4.24E-10 | -5.14E-12 |
R3 | -4.40E+00 | 8.63E-03 | -9.13E-04 | 2.19E-04 | -7.01E-05 | 1.81E-05 | -3.08E-06 | 3.15E-07 | -1.75E-08 | 3.99E-10 |
R4 | 3.74E+00 | 6.14E-03 | -2.38E-03 | 1.08E-03 | -3.60E-04 | 7.95E-05 | -1.13E-05 | 9.83E-07 | -4.81E-08 | 1.01E-09 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | -1.47E+00 | -9.52E-03 | -1.29E-03 | 1.40E-03 | -6.20E-04 | 1.65E-04 | -2.65E-05 | 2.55E-06 | -1.34E-07 | 2.94E-09 |
R6 | 3.00E-01 | -1.77E-02 | 9.67E-04 | 8.02E-04 | -5.47E-04 | 1.83E-04 | -3.45E-05 | 3.73E-06 | -2.14E-07 | 4.97E-09 |
R7 | -4.34E+00 | 7.45E-05 | -4.75E-04 | 3.18E-04 | -2.38E-04 | 1.02E-04 | -2.69E-05 | 4.33E-06 | -3.85E-07 | 1.45E-08 |
R8 | 8.41E+00 | -2.16E-03 | -2.05E-04 | 3.86E-05 | 5.75E-06 | 2.68E-07 | -4.46E-08 | -1.08E-08 | -1.10E-09 | 2.31E-10 |
R9 | 5.00E+01 | -4.34E-03 | 1.34E-04 | -8.50E-06 | 8.08E-06 | 1.63E-06 | 1.62E-07 | -5.39E-08 | -1.02E-08 | 1.41E-09 |
R10 | -4.98E+01 | 9.83E-04 | 4.56E-04 | 2.62E-04 | -2.50E-04 | 1.01E-04 | -2.29E-05 | 3.02E-06 | -2.13E-07 | 6.16E-09 |
R11 | -2.84E+00 | -2.51E-02 | -5.08E-04 | 1.69E-03 | -7.65E-04 | 1.96E-04 | -3.03E-05 | 2.80E-06 | -1.39E-07 | 2.84E-09 |
R12 | -2.78E-01 | -2.62E-02 | 1.94E-03 | 1.93E-04 | -1.13E-04 | 2.03E-05 | -2.05E-06 | 1.21E-07 | -3.94E-09 | 5.46E-11 |
In the above table, R9 represents the radius of curvature at the paraxial of the object side of the supplemental lens 16, and R10 represents the radius of curvature at the paraxial of the image side of the supplemental lens 16; r11 represents a radius of curvature at the paraxial region of the object side surface of the fifth lens 15, and R12 represents a radius of curvature at the paraxial region of the image side surface of the fifth lens 15; in the table, the meanings of the symbols other than R9, R10, R11 and R12 are shown in Table 3.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 29 to 31c are graphs showing the optical performance of the optical lens 10 according to the seventh embodiment.
Specifically, fig. 29 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the seventh embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 29 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 29, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 30 shows a principal ray incidence angle curve of the optical lens 10 of the seventh embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 30 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the seventh embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 reaches 37.9 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 31a is a temperature drift modulation contrast curve of the optical lens 10 of the seventh embodiment at normal temperature (22 ℃); fig. 31b is a temperature drift modulation contrast curve of the optical lens 10 of the seventh embodiment at-30 ℃; fig. 31c is a temperature drift modulation contrast curve of the optical lens 10 according to the seventh embodiment at +70℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 31a, 31b, and 31c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 32, fig. 32 is a schematic diagram illustrating a part of the structure of an optical lens 10 according to an eighth embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a negative refractive power, a concave object-side surface at a paraxial region thereof, and a convex image-side surface at a paraxial region thereof; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is convex at a paraxial region thereof, and the image-measuring surface is convex at the paraxial region thereof. The fourth lens 14 is a glass lens, and the other lenses (including the first lens 11, the second lens 12, the third lens 13, the supplemental lens 16, and the fifth lens 15) are all plastic lenses.
The design parameters of the eighth embodiment of the present application are shown in table 22 below.
Table 22 basic parameters of the optical lens 10 of the eighth embodiment
Focal length EFFL | 5.62mm |
F# value | 1.5 |
FOV | 94° |
IH | 9.5mm |
Total optical length TTL | 14mm |
EFFL/TTL | 0.40 |
EFFL/IH | 0.595 |
EFFL/(F#×TTL) | 0.269 |
(IH×EFFL)/(F#×TTL2) | 0.183 |
f4/EFFL | 0.98 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
|v4-v5| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 1.5, an overall optical length TTL of 14mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain the optical lens 10 having the optical basic parameters in table 22, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 22. Referring to table 23 and table 24, table 23 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 24 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 23 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the eighth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 24.
Table 24 aspherical coefficient of optical lens 10 according to eighth embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | -3.43E-01 | 1.39E-02 | -1.54E-03 | 1.54E-04 | -1.25E-05 | 7.63E-07 | -3.26E-08 | 9.06E-10 | -1.45E-11 | 1.00E-13 |
R2 | -3.69E+01 | 1.53E-02 | -1.18E-03 | 5.82E-05 | 3.17E-06 | -1.05E-06 | 1.11E-07 | -6.82E-09 | 2.41E-10 | -3.64E-12 |
R3 | -3.38E+00 | 8.04E-03 | -7.02E-04 | 9.99E-05 | -8.55E-06 | -8.86E-07 | 4.18E-07 | -6.16E-08 | 4.28E-09 | -1.20E-10 |
R4 | 2.73E+00 | 7.03E-03 | -2.81E-03 | 1.01E-03 | -2.75E-04 | 5.30E-05 | -6.89E-06 | 5.67E-07 | -2.65E-08 | 5.32E-10 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | -1.82E+00 | -1.50E-02 | 9.24E-04 | 1.04E-04 | -3.82E-05 | 1.05E-05 | -1.63E-06 | 1.20E-07 | -2.79E-09 | -5.16E-11 |
R6 | 4.37E-01 | -2.41E-02 | 4.37E-03 | -1.29E-03 | 4.36E-04 | -1.05E-04 | 1.72E-05 | -1.80E-06 | 1.05E-07 | -2.64E-09 |
R7 | -4.04E+00 | 5.06E-04 | -5.97E-04 | 3.71E-04 | -2.56E-04 | 1.05E-04 | -2.59E-05 | 3.83E-06 | -3.07E-07 | 1.01E-08 |
R8 | 7.90E+00 | -3.01E-03 | -1.79E-04 | 4.43E-05 | 4.90E-06 | 3.91E-08 | -6.24E-08 | -9.39E-09 | -5.61E-10 | 2.69E-10 |
R9 | -4.74E+01 | -6.42E-03 | 9.90E-05 | -2.70E-06 | 1.33E-05 | 1.94E-06 | 7.41E-08 | -7.39E-08 | -1.07E-08 | 1.87E-09 |
R10 | -1.86E+01 | 6.44E-03 | -1.22E-03 | 3.89E-04 | -1.23E-04 | 3.95E-05 | -8.21E-06 | 1.06E-06 | -7.68E-08 | 2.34E-09 |
R11 | -6.23E+00 | -2.72E-02 | 5.93E-04 | 1.16E-03 | -5.79E-04 | 1.54E-04 | -2.42E-05 | 2.24E-06 | -1.10E-07 | 2.14E-09 |
R12 | -1.83E-01 | -2.85E-02 | 3.07E-03 | -1.71E-04 | -3.65E-05 | 9.97E-06 | -1.16E-06 | 7.46E-08 | -2.60E-09 | 3.86E-11 |
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 33 to 35c are graphs showing the optical performance of the optical lens 10 according to the eighth embodiment.
Specifically, fig. 33 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the eighth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 33 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 33, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 34 shows a principal ray incidence angle curve of the optical lens 10 of the eighth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 34 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the eighth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is 38.8 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 35a is a temperature drift modulation contrast curve of the optical lens 10 of the eighth embodiment at normal temperature (22 ℃); fig. 35b is a temperature drift modulation contrast curve of the optical lens 10 of the eighth embodiment at-30 ℃; fig. 35c is a temperature drift modulation contrast curve of the optical lens 10 according to the eighth embodiment at +70℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 35a, 35b, and 35c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 36, fig. 36 is a schematic view illustrating a part of the structure of an optical lens 10 according to a ninth embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a negative refractive power, a concave object-side surface at a paraxial region thereof, and a convex image-side surface at a paraxial region thereof; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is convex at a paraxial region thereof, and the image-measuring surface is convex at the paraxial region thereof. The fourth lens 14 is a glass lens, and the other lenses (including the first lens 11, the second lens 12, the third lens 13, the supplemental lens 16, and the fifth lens 15) are all plastic lenses.
Design parameters of the ninth embodiment of the present application are shown in table 25 below.
Table 25 basic parameters of the optical lens 10 of the ninth embodiment
Focal length EFFL | 5.67mm |
F# value | 1.5 |
FOV | 94° |
IH | 9.5mm |
Total optical length TTL | 14mm |
EFFL/TTL | 0.41 |
EFFL/IH | 0.597 |
EFFL/(F#×TTL) | 0.270 |
(IH×EFFL)/(F#×TTL2) | 0.183 |
f4/EFFL | 0.94 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
|v4-v5| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 1.5, an overall optical length TTL of 14mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain the optical lens 10 having the optical basic parameters in table 25, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 25. Referring to table 26 and table 27, table 26 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 27 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 26 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the ninth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 27.
Table 27 aspherical coefficients of optical lens 10 of the ninth embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | -3.80E-01 | 1.50E-02 | -1.67E-03 | 1.66E-04 | -1.35E-05 | 8.38E-07 | -3.64E-08 | 1.03E-09 | -1.67E-11 | 1.17E-13 |
R2 | -4.18E+01 | 1.64E-02 | -1.15E-03 | 1.35E-05 | 1.23E-05 | -2.36E-06 | 2.37E-07 | -1.39E-08 | 4.51E-10 | -6.16E-12 |
R3 | -3.30E+00 | 1.02E-02 | -8.83E-04 | -9.11E-05 | 1.21E-04 | -4.16E-05 | 7.95E-06 | -8.90E-07 | 5.44E-08 | -1.41E-09 |
R4 | 1.99E+00 | 4.52E-03 | -3.20E-04 | 1.18E-04 | -7.79E-05 | 2.65E-05 | -5.15E-06 | 5.78E-07 | -3.49E-08 | 8.73E-10 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | -2.40E+00 | -2.05E-02 | 3.19E-03 | 1.36E-04 | -3.10E-04 | 1.05E-04 | -1.85E-05 | 1.87E-06 | -1.04E-07 | 2.46E-09 |
R6 | 4.94E-01 | -2.78E-02 | 3.58E-03 | 1.04E-03 | -1.03E-03 | 3.97E-04 | -8.77E-05 | 1.15E-05 | -8.28E-07 | 2.49E-08 |
R7 | -3.55E+00 | -5.95E-04 | 2.59E-04 | -2.77E-04 | 1.19E-04 | -3.11E-05 | 4.47E-06 | -2.82E-07 | 1.92E-09 | 3.27E-10 |
R8 | 8.79E+00 | -1.63E-03 | -2.99E-04 | 5.26E-05 | 8.66E-06 | 6.32E-07 | -4.21E-08 | -2.27E-08 | -3.03E-09 | 8.70E-10 |
R9 | -1.86E+01 | -6.64E-03 | 3.87E-04 | -9.04E-06 | 9.59E-06 | 1.44E-06 | 6.95E-08 | -5.67E-08 | -7.15E-09 | 1.32E-09 |
R10 | -5.00E+01 | 2.28E-03 | -2.42E-05 | 4.00E-04 | -2.39E-04 | 8.01E-05 | -1.59E-05 | 1.88E-06 | -1.19E-07 | 3.11E-09 |
R11 | -4.29E+01 | -3.54E-02 | 2.60E-03 | 2.76E-04 | -1.91E-04 | 4.55E-05 | -6.18E-06 | 4.80E-07 | -1.68E-08 | 9.16E-11 |
R12 | -4.05E-01 | -4.19E-02 | 6.53E-03 | -8.96E-04 | 7.86E-05 | -3.38E-06 | -9.17E-08 | 2.00E-08 | -9.79E-10 | 1.70E-11 |
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 37 to 39c are graphs showing the optical performance of the optical lens 10 according to the ninth embodiment.
Specifically, fig. 37 is a schematic diagram showing axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the ninth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 37 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 37, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 38 shows a principal ray incidence angle curve of the optical lens 10 of the ninth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 38 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the ninth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is up to 42.5 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 39a is a temperature drift modulation contrast curve of the optical lens 10 of the ninth embodiment at normal temperature (22 ℃); fig. 39b is a temperature drift modulation contrast curve of the optical lens 10 of the ninth embodiment at-30 ℃; fig. 39c is a temperature drift modulation contrast curve of the optical lens 10 of the ninth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 39a, 39b, and 39c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 40, fig. 40 is a schematic view illustrating a part of the structure of an optical lens 10 according to a tenth embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is convex at a paraxial region thereof, and the image-measuring surface is convex at the paraxial region thereof. The fourth lens 14 is a glass lens, and the other lenses (including the first lens 11, the second lens 12, the third lens 13, the supplemental lens 16, and the fifth lens 15) are all plastic lenses.
Design parameters of the tenth embodiment of the present application are as shown in table 28 below.
Table 28 basic parameters of the optical lens 10 of the tenth embodiment
Focal length EFFL | 5.77mm |
F# value | 1.5 |
FOV | 94° |
IH | 9.5mm |
Total optical length TTL | 14mm |
EFFL/TTL | 0.41 |
EFFL/IH | 0.607 |
EFFL/(F#×TTL) | 0.275 |
(IH×EFFL)/(F#×TTL2) | 0.186 |
f4/EFFL | 0.97 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
|v4-v5| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 1.5, an overall optical length TTL of 14mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain an optical lens 10 having the optical basic parameters in table 28, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain an optical lens 10 having the optical parameters in table 28. Referring to table 29 and table 30, table 29 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 30 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 29 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the tenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 30.
Table 30 aspherical coefficient of optical lens 10 according to tenth embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | -1.31E-01 | 7.69E-03 | -7.86E-04 | 8.28E-05 | -7.17E-06 | 4.50E-07 | -1.89E-08 | 5.01E-10 | -7.47E-12 | 4.72E-14 |
R2 | -3.97E-01 | 4.14E-03 | -2.49E-04 | 1.27E-05 | 2.47E-06 | -7.23E-07 | 7.42E-08 | -3.79E-09 | 9.67E-11 | -9.86E-13 |
R3 | -3.99E+00 | 7.47E-03 | -5.08E-04 | -3.20E-05 | 4.01E-05 | -1.16E-05 | 1.84E-06 | -1.74E-07 | 9.09E-09 | -2.02E-10 |
R4 | 2.92E+00 | 4.79E-03 | -1.24E-03 | 3.37E-04 | -7.60E-05 | 1.27E-05 | -1.48E-06 | 1.13E-07 | -5.09E-09 | 1.00E-10 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | -2.09E+00 | -1.47E-02 | 5.20E-04 | 1.11E-04 | -2.99E-05 | 9.57E-06 | -1.45E-06 | 1.05E-07 | -3.54E-09 | 3.59E-11 |
R6 | 4.70E-01 | -2.26E-02 | 2.11E-03 | -8.92E-05 | -7.26E-05 | 5.26E-05 | -1.52E-05 | 2.41E-06 | -1.99E-07 | 6.54E-09 |
R7 | -2.53E+00 | 1.70E-04 | -2.16E-04 | 2.10E-05 | -2.06E-06 | -5.17E-07 | 4.04E-07 | -6.64E-08 | 4.19E-09 | -9.16E-11 |
R8 | 7.94E+00 | -2.17E-03 | -2.44E-04 | 4.99E-05 | 6.45E-06 | 1.75E-07 | -6.31E-08 | -9.72E-09 | -4.45E-10 | 1.78E-10 |
R9 | 5.00E+01 | -6.53E-03 | 1.88E-04 | -1.40E-05 | 8.47E-06 | 1.44E-06 | 1.29E-07 | -5.04E-08 | -9.37E-09 | 1.35E-09 |
R10 | -2.48E+01 | -2.03E-04 | 4.21E-04 | 2.39E-04 | -1.94E-04 | 7.14E-05 | -1.48E-05 | 1.77E-06 | -1.14E-07 | 2.96E-09 |
R11 | -2.84E+00 | -2.22E-02 | 1.43E-03 | 1.56E-04 | -1.35E-04 | 3.70E-05 | -5.58E-06 | 4.82E-07 | -2.14E-08 | 3.65E-10 |
R12 | -2.38E-01 | -2.43E-02 | 2.54E-03 | -2.01E-04 | -6.47E-06 | 3.81E-06 | -4.73E-07 | 3.04E-08 | -1.03E-09 | 1.46E-11 |
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 41 to 43c are graphs showing the optical performance of the optical lens 10 according to the tenth embodiment.
Specifically, fig. 41 is a schematic diagram of axial chromatic aberration after light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passes through the optical lens 10 of the tenth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 41 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 41, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 42 shows a principal ray incidence angle curve of the optical lens 10 of the tenth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 42 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the tenth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is up to 40.6 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 43a is a temperature drift modulation contrast curve of the optical lens 10 of the tenth embodiment at normal temperature (22 ℃); fig. 43b is a temperature drift modulation contrast curve of the optical lens 10 of the tenth embodiment at-30 ℃; fig. 43c is a temperature drift modulation contrast curve of the optical lens 10 according to the tenth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 43a, 43b, and 43c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 44, fig. 44 is a schematic view showing a part of the structure of an optical lens 10 according to an eleventh embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a positive refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is convex at a paraxial region thereof, and the image-measuring surface is convex at the paraxial region thereof. The fourth lens 14 is a glass lens, and the other lenses (including the first lens 11, the second lens 12, the third lens 13, the supplemental lens 16, and the fifth lens 15) are all plastic lenses.
The design parameters of the eleventh embodiment of the present application are as shown in table 31 below.
Table 31 basic parameters of the optical lens 10 of the eleventh embodiment
Focal length EFFL | 5.62mm |
F# value | 1.5 |
FOV | 94° |
IH | 9.5mm |
Total optical length TTL | 15mm |
EFFL/TTL | 0.375 |
EFFL/IH | 0.592 |
EFFL/(F#×TTL) | 0.250 |
(IH×EFFL)/(F#×TTL2) | 0.158 |
f4/EFFL | 0.99 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
|v4-v5| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 1.5, an overall optical length TTL of 14mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain the optical lens 10 having the optical basic parameters in table 31, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 31. Referring to table 32 and table 33, table 32 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 33 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 32 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the eleventh embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 33.
Table 33 aspherical coefficient of optical lens 10 of the eleventh embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | -3.45E-01 | 1.26E-02 | -1.59E-03 | 1.72E-04 | -1.41E-05 | 8.37E-07 | -3.40E-08 | 8.87E-10 | -1.32E-11 | 8.44E-14 |
R2 | -5.00E+01 | 1.78E-02 | -1.74E-03 | 4.55E-05 | 2.41E-05 | -5.16E-06 | 5.27E-07 | -2.97E-08 | 8.77E-10 | -1.06E-11 |
R3 | -2.97E+00 | 1.04E-02 | -1.58E-03 | 2.69E-04 | -3.81E-05 | 4.26E-06 | -3.58E-07 | 1.89E-08 | -4.20E-10 | -4.09E-12 |
R4 | 7.63E+00 | -7.19E-03 | 4.43E-03 | -1.46E-03 | 3.22E-04 | -4.80E-05 | 4.68E-06 | -2.80E-07 | 9.16E-09 | -1.22E-10 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | -3.59E+00 | -1.81E-02 | 1.41E-03 | 5.64E-04 | -4.19E-04 | 1.33E-04 | -2.42E-05 | 2.63E-06 | -1.59E-07 | 4.09E-09 |
R6 | -5.85E-02 | -1.55E-02 | -3.39E-03 | 3.29E-03 | -1.44E-03 | 3.96E-04 | -6.89E-05 | 7.35E-06 | -4.36E-07 | 1.09E-08 |
R7 | -1.81E+00 | 6.56E-04 | -5.97E-05 | -1.73E-04 | 1.04E-04 | -3.46E-05 | 6.78E-06 | -7.40E-07 | 4.12E-08 | -9.11E-10 |
R8 | 8.26E+00 | -1.61E-03 | -2.43E-04 | 3.25E-05 | 6.12E-06 | 4.38E-07 | -2.60E-08 | -1.11E-08 | -1.42E-09 | 2.27E-10 |
R9 | 2.21E+01 | -5.96E-03 | 2.44E-04 | -4.06E-06 | 5.05E-06 | 1.04E-06 | 1.41E-07 | -4.22E-08 | -8.11E-09 | 1.14E-09 |
R10 | -5.00E+01 | -1.00E-03 | 6.70E-04 | 9.49E-05 | -8.97E-05 | 2.96E-05 | -5.23E-06 | 5.16E-07 | -2.65E-08 | 5.47E-10 |
R11 | 6.42E+00 | -1.97E-02 | 1.76E-03 | -5.42E-04 | 2.20E-04 | -5.73E-05 | 9.40E-06 | -9.25E-07 | 4.95E-08 | -1.10E-09 |
R12 | -4.32E-01 | -1.31E-02 | 4.11E-04 | 1.63E-04 | -4.76E-05 | 6.71E-06 | -5.67E-07 | 2.90E-08 | -8.29E-10 | 1.01E-11 |
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 45 to 47c are graphs showing the optical performance of the optical lens 10 of the eleventh embodiment.
Specifically, fig. 45 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 according to the tenth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 45 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 45, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 46 shows a principal ray incidence angle curve of the optical lens 10 of the eleventh embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 46 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the eleventh embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is 36.5 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 47a is a temperature drift modulation contrast curve of the optical lens 10 of the eleventh embodiment at normal temperature (22 ℃); fig. 47b is a temperature drift modulation contrast curve of the optical lens 10 of the eleventh embodiment at-30 ℃; fig. 47c is a temperature drift modulation contrast curve of the optical lens 10 according to the tenth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 47a, 47b and 47c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 48, fig. 48 is a schematic diagram illustrating a part of the structure of an optical lens 10 according to a twelfth embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is convex at a paraxial region thereof, and the image-measuring surface is convex at the paraxial region thereof. The second lens 12 is a glass lens, and the other lenses (including the first lens 11, the third lens 13, the fourth lens 14, the supplemental lens 16, and the fifth lens 15) are plastic lenses.
Design parameters of the twelfth embodiment of the present application are as shown in table 34 below.
Table 34 basic parameters of the optical lens 10 of the twelfth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 1.5, an overall optical length TTL of 14mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain an optical lens 10 having the optical basic parameters in table 34, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain an optical lens 10 having the optical parameters in table 34. Referring to table 35 and table 36, table 35 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 36 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 35 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the twelfth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 36.
Table 36 aspherical coefficient of optical lens 10 of twelfth embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | -5.27E+00 | 8.30E-03 | -6.65E-04 | 3.83E-05 | -1.39E-06 | 3.33E-09 | 1.96E-09 | -7.96E-11 | 1.34E-12 | -8.51E-15 |
R2 | -4.68E+01 | 9.46E-03 | 2.38E-04 | -1.00E-04 | 1.22E-05 | -2.27E-07 | -8.75E-08 | 8.13E-09 | -2.79E-10 | 3.45E-12 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R3 | -5.00E+01 | 4.77E-03 | -9.14E-04 | 1.05E-04 | 3.23E-05 | -1.91E-05 | 4.24E-06 | -5.01E-07 | 3.05E-08 | -7.41E-10 |
R4 | -9.76E+00 | 1.90E-04 | -3.63E-05 | -9.94E-06 | -1.42E-06 | 7.56E-08 | 4.28E-19 | -4.01E-22 | -1.09E-23 | -3.77E-25 |
R5 | -5.18E+00 | -7.80E-03 | 2.59E-03 | -9.65E-04 | 2.98E-04 | -9.37E-05 | 2.15E-05 | -3.05E-06 | 2.35E-07 | -7.47E-09 |
R6 | -5.86E-01 | -1.52E-02 | 4.10E-03 | -1.48E-03 | 4.71E-04 | -1.53E-04 | 3.67E-05 | -5.43E-06 | 4.34E-07 | -1.42E-08 |
R7 | -7.01E-01 | -2.49E-03 | 8.70E-04 | -2.73E-05 | -5.73E-05 | 1.80E-05 | -2.48E-06 | 1.77E-07 | -6.37E-09 | 9.11E-11 |
R8 | 5.79E-01 | -2.72E-02 | 2.12E-02 | -1.04E-02 | 3.56E-03 | -8.29E-04 | 1.28E-04 | -1.25E-05 | 6.86E-07 | -1.61E-08 |
R9 | -8.47E+00 | -3.54E-02 | 2.04E-02 | -8.16E-03 | 2.11E-03 | -3.01E-04 | 3.46E-06 | 6.57E-06 | -1.02E-06 | 5.10E-08 |
R10 | 4.29E-01 | -1.52E-02 | 4.96E-03 | -2.29E-04 | -5.50E-04 | 2.91E-04 | -7.63E-05 | 1.16E-05 | -9.69E-07 | 3.34E-08 |
R11 | 2.97E+00 | -2.58E-02 | 1.53E-03 | -5.96E-05 | -5.63E-06 | -5.72E-06 | 2.65E-06 | -4.56E-07 | 3.77E-08 | -1.21E-09 |
R12 | -2.97E-01 | -2.73E-02 | 3.04E-03 | -2.93E-04 | 1.11E-05 | 1.19E-06 | -2.16E-07 | 1.47E-08 | -4.99E-10 | 7.00E-12 |
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 49 to 51c are graphs showing the optical performance of the optical lens 10 according to the twelfth embodiment.
Specifically, fig. 49 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 according to the tenth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 49 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 49, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 50 shows a principal ray incidence angle curve of the optical lens 10 of the twelfth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 50 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the twelfth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 reaches 38.7 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 51a is a temperature drift modulation contrast curve of the optical lens 10 of the twelfth embodiment at normal temperature (22 ℃); FIG. 51b is a graph showing the temperature drift modulation contrast at-30deg.C of the optical lens 10 according to the twelfth embodiment; fig. 51c is a temperature drift modulation contrast curve of the optical lens 10 according to the tenth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 51a, 51b, and 51c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 52, fig. 52 is a schematic diagram illustrating a part of the structure of an optical lens 10 according to a thirteenth embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a positive power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has at least one inflection point on each of an object-side surface and an image-side surface, wherein the object-side surface is convex at a paraxial region thereof, and the image-measuring surface is convex at the paraxial region thereof. The second lens 12 is a glass lens, and the other lenses (including the first lens 11, the third lens 13, the fourth lens 14, the supplemental lens 16, and the fifth lens 15) are plastic lenses.
Design parameters of the thirteenth embodiment of the present application are as shown in table 37 below.
Table 37 basic parameters of the optical lens 10 of the thirteenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 1.5, an overall optical length TTL of 14mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain the optical lens 10 having the optical basic parameters in table 37, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 37. Referring to table 38 and table 39, table 38 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 39 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 38 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the thirteenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 39.
Table 39 aspherical coefficient of optical lens 10 of thirteenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 53 to 55c are graphs showing the optical performance of the optical lens 10 according to the thirteenth embodiment.
Specifically, fig. 53 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 according to the tenth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 53 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 53, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 54 shows a principal ray incidence angle curve of the optical lens 10 of the thirteenth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 54 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the thirteenth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is 38.8 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 55a is a temperature drift modulation contrast curve of the optical lens 10 of the thirteenth embodiment at normal temperature (22 ℃); fig. 55b is a temperature drift modulation contrast curve of the optical lens 10 of the thirteenth embodiment at-30 ℃; fig. 55c is a temperature drift modulation contrast curve of the optical lens 10 according to the tenth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 55a, 55b, and 55c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, that is, the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, that is, the optical lens 10 has a smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have a better imaging effect at different temperatures.
Referring to fig. 56, fig. 56 is a schematic view showing a part of the structure of an optical lens 10 according to a fourteenth embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has an M-shaped object-side surface with no inflection point, a concave object-side surface at a paraxial region, at least one inflection point at an image-side surface, and a convex image-measuring surface at the paraxial region. The second lens 12 is a glass lens, and the other lenses (including the first lens 11, the third lens 13, the fourth lens 14, the supplemental lens 16, and the fifth lens 15) are plastic lenses.
Design parameters of the fourteenth embodiment of the present application are as shown in table 40 below.
Table 40 basic parameters of the optical lens 10 of the fourteenth embodiment
Focal length EFFL | 5.79mm |
F# value | 1.5 |
FOV | 94° |
IH | 9.5mm |
Total optical length TTL | 14mm |
EFFL/TTL | 0.41 |
EFFL/IH | 0.609 |
EFFL/(F#×TTL) | 0.276 |
(IH×EFFL)/(F#×TTL2) | 0.187 |
f4/EFFL | 0.879 |
|v2-v3| | 29.2 |
|v4-v3| | 35.6 |
|v4-v5| | 35.6 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 1.5, an overall optical length TTL of 14mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time.
In order to obtain the optical lens 10 having the optical basic parameters in table 40, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 40. Referring to table 41 and table 42, table 41 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 42 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 41 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the fourteenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 42.
Table 42 aspherical coefficient of optical lens 10 of the fourteenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 57 to 59c are graphs showing the optical performance of the optical lens 10 of the fourteenth embodiment.
Specifically, fig. 57 is a schematic diagram of axial chromatic aberration after light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passes through the optical lens 10 of the tenth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 57 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 57, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 58 shows a principal ray incidence angle curve of the optical lens 10 of the fourteenth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 58 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the fourteenth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is 38.8 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 59a is a temperature drift modulation contrast curve of the optical lens 10 of the fourteenth embodiment at normal temperature (22 ℃); fig. 59b is a temperature drift modulation contrast curve of the optical lens 10 of the fourteenth embodiment at-30 ℃; fig. 59c is a temperature drift modulation contrast curve of the optical lens 10 of the tenth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency relationship at different image height positions, respectively. As can be seen from fig. 59a, 59b, and 59c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, that is, the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, that is, the optical lens 10 has a smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have a better imaging effect at different temperatures.
Referring to fig. 60, fig. 60 is a schematic view showing a part of the structure of an optical lens 10 according to a fifteenth embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has an M-shaped object-side surface with no inflection point, a concave object-side surface at a paraxial region, at least one inflection point at an image-side surface, and a convex image-measuring surface at the paraxial region. The second lens 12 is a glass lens, and the other lenses (including the first lens 11, the third lens 13, the fourth lens 14, the supplemental lens 16, and the fifth lens 15) are plastic lenses.
The design parameters of the fifteenth embodiment of the present application are as follows in table 43.
Table 43 basic parameters of the optical lens 10 of the fifteenth embodiment
Focal length EFFL | 6.0mm |
F# value | 2.0 |
FOV | 94° |
IH | 9.5mm |
Total optical length TTL | 10mm |
EFFL/TTL | 0.62 |
EFFL/IH | 0.633 |
EFFL/(F#×TTL) | 0.301 |
(IH×EFFL)/(F#×TTL2) | 0.286 |
f4/EFFL | 0.96 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
|v4-v5| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 2.0, an overall optical length TTL of 10mm, an ih of 9.5mm, and a fov of 94 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time. The optical lens 10 of the present embodiment has a smaller optical overall length than that of the seventh embodiment, and can be more suitably used in a small electronic device.
In order to obtain the optical lens 10 having the optical basic parameters in table 43, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 43. Referring to table 44 and table 45, table 44 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 45 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 44 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the fifteenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 45.
Table 45 aspherical coefficient of optical lens 10 of the fifteenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 61 to 63c are graphs showing the optical performance of the optical lens 10 according to the fifteenth embodiment.
Specifically, fig. 61 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the tenth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 61 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 61, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 62 shows a principal ray incidence angle curve of the optical lens 10 of the fifteenth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 62 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the fifteenth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is up to 39.0 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 63a is a temperature drift modulation contrast curve of the optical lens 10 of the fifteenth embodiment at normal temperature (22 ℃); fig. 63b is a temperature drift modulation contrast curve of the optical lens 10 of the fifteenth embodiment at-30 ℃; fig. 63c is a temperature drift modulation contrast curve of the optical lens 10 according to the tenth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 63a, 63b, and 63c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 64, fig. 64 is a schematic view showing a part of the structure of an optical lens 10 according to a sixteenth embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has an M-shaped object-side surface with no inflection point, a concave object-side surface at a paraxial region, at least one inflection point at an image-side surface, and a convex image-measuring surface at the paraxial region. The second lens 12 is a glass lens, and the other lenses (including the first lens 11, the third lens 13, the fourth lens 14, the supplemental lens 16, and the fifth lens 15) are plastic lenses.
Design parameters of the sixteenth embodiment of the present application are as shown in table 46 below.
Table 46 basic parameters of the optical lens 10 of the sixteenth embodiment
Focal length EFFL | 5.82mm |
F# value | 2.0 |
FOV | 44° |
IH | 4.6mm |
Total optical length TTL | 7mm |
EFFL/TTL | 0.83 |
EFFL/IH | 1.26 |
EFFL/(F#×TTL) | 0.417 |
(IH×EFFL)/(F#×TTL2) | 0.27 |
f4/EFFL | 0.96 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
|v4-v5| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 2.0, an overall optical length TTL of 7mm, an ih of 4.6mm, and a fov of 44 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time. The optical lens 10 of the present embodiment has a smaller total optical length than the seventh embodiment, and can be applied to a small electronic device.
In order to obtain an optical lens 10 having the optical basic parameters in table 46, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain an optical lens 10 having the optical parameters in table 46. Referring to table 47 and table 48, table 47 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 48 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 47 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the sixteenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 of the present embodiment are shown in table 48.
Table 48 aspherical coefficient of optical lens 10 of sixteenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 65 to 67c are graphs showing the optical performance of the optical lens 10 according to the sixteenth embodiment.
Specifically, fig. 65 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the tenth sixth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 65 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 65, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 66 shows a principal ray incidence angle curve of the optical lens 10 of the sixteenth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). Fig. 66 is used to characterize the change in the curve of chief ray incidence angle at different image heights. As can be seen from the figure, in the sixteenth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is up to 27.4 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 67a is a temperature drift modulation contrast curve of the optical lens 10 of the sixteenth embodiment at normal temperature (22 ℃); fig. 67b is a temperature drift modulation contrast curve of the optical lens 10 of the sixteenth embodiment at-30 ℃; fig. 67c is a temperature drift modulation contrast curve of the optical lens 10 according to the tenth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 67a, 67b, and 67c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 68, fig. 68 is a schematic view showing a part of the structure of an optical lens 10 according to a seventeenth embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has an M-shaped object-side surface with no inflection point, a concave object-side surface at a paraxial region, at least one inflection point at an image-side surface, and a convex image-measuring surface at the paraxial region. The second lens 12 is a glass lens, and the other lenses (including the first lens 11, the third lens 13, the fourth lens 14, the supplemental lens 16, and the fifth lens 15) are plastic lenses.
Design parameters of the seventeenth embodiment of the present application are as shown in table 49 below.
Table 49 basic parameters of the optical lens 10 of the seventeenth embodiment
Focal length EFFL | 3.96mm |
F# value | 2.0 |
FOV | 128° |
IH | 9.5mm |
Total optical length TTL | 15.58mm |
EFFL/TTL | 0.254 |
EFFL/IH | 0.417 |
EFFL/(F#×TTL) | 0.127 |
(IH×EFFL)/(F#×TTL2) | 0.077 |
f4/EFFL | 1.20 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
|v4-v5| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 2.0, an overall optical length TTL of 7mm, an ih of 4.6mm, and a fov of 44 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time. The optical lens 10 of the present embodiment has a smaller total optical length than the seventh embodiment, and can be applied to a small electronic device.
In order to obtain the optical lens 10 having the optical basic parameters in table 49, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 49. Referring to table 50 and table 51, table 50 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 51 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 50 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the seventeenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 51.
Table 51 aspherical coefficient of optical lens 10 according to seventeenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 69 to 71c are diagrams showing the optical performance of the optical lens 10 according to the seventeenth embodiment.
Specifically, fig. 69 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 of the tenth seventh embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 69 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 69, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 70 shows a principal ray incidence angle curve of the optical lens 10 of the seventeenth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). The graph 70 is used to characterize the curve change of chief ray incidence angle at different image heights. As can be seen from the figure, in the seventeenth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 is up to 37.6 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 71a is a temperature drift modulation contrast curve of the optical lens 10 of the seventeenth embodiment at normal temperature (22 ℃); fig. 71b is a temperature drift modulation contrast curve of the optical lens 10 of the seventeenth embodiment at-30 ℃; fig. 71c is a temperature drift modulation contrast curve of the optical lens 10 according to the tenth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 71a, 71b and 71c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
Referring to fig. 72, fig. 72 is a schematic view showing a part of the structure of an optical lens 10 according to an eighteenth embodiment of the present application. In the present embodiment, the optical lens 10 is a six-lens type lens including six lenses, and the six lenses are a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a supplemental lens 16, and a fifth lens 15 in order from the object side to the image side. The first lens element 11 has a concave object-side surface at the paraxial region and a concave image-side surface at the paraxial region; the second lens element 12 has a positive refractive power, and has convex object-side and image-side surfaces at paraxial regions; the third lens element 13 has a negative refractive power, a convex object-side surface at the paraxial region thereof, and a concave image-side surface at the paraxial region thereof; the fourth lens element 14 has a convex object-side surface at the paraxial region; the supplemental lens 16 is a negative power lens with concave object-side and image-side surfaces at paraxial regions; the fifth lens element 15 has an M-shaped object-side surface with no inflection point, a concave object-side surface at a paraxial region, at least one inflection point at an image-side surface, and a convex image-measuring surface at the paraxial region. The second lens 12 is a glass lens, and the other lenses (including the first lens 11, the third lens 13, the fourth lens 14, the supplemental lens 16, and the fifth lens 15) are plastic lenses.
The design parameters of the eighteenth embodiment of the present application are as shown in table 52 below.
Table 52 basic parameters of the optical lens 10 of the eighteenth embodiment
Focal length EFFL | 4.0mm |
F# value | 1.0 |
FOV | 44° |
IH | 3.52mm |
Total optical length TTL | 15.58mm |
EFFL/TTL | 0.241 |
EFFL/IH | 1.14 |
EFFL/(F#×TTL) | 0.241 |
(IH×EFFL)/(F#×TTL2) | 0.05 |
f4/EFFL | 1.06 |
|v2-v3| | 35.6 |
|v4-v3| | 29.2 |
|v4-v5| | 29.2 |
Design wavelength | 650nm,610nm,555nm,510nm,470nm |
In the above table, the meaning of each symbol in the table is referred to in table 19.
From the above table, it can be seen that: the optical lens 10 provided in this embodiment has an f# value of 2.0, an overall optical length TTL of 7mm, an ih of 4.6mm, and a fov of 44 °, that is, the optical lens 10 of this embodiment can have the characteristics of a large aperture, a large viewing angle, a large image height (with high resolution), and a small optical length at the same time. The optical lens 10 of the present embodiment has a smaller total optical length than the seventh embodiment, and can be applied to a small electronic device.
In order to obtain the optical lens 10 having the optical basic parameters in table 52, parameters such as radius of curvature, thickness, refractive index, abbe number, and the like of each lens, and surface coefficients of the object side surface and the image side surface of each lens need to be able to be matched to obtain the optical lens 10 having the optical parameters in table 52. Referring to table 53 and table 54, table 53 shows parameters such as radius of curvature, thickness, refractive index, abbe number, etc. of each lens in the optical lens 10 in the embodiment of the present application, and table 54 shows surface coefficients of each lens in the optical lens 10 in the embodiment of the present application.
Table 53 radius of curvature, thickness, refractive index, abbe number of each lens in the optical lens 10 of the eighteenth embodiment
In the above table, the meaning of each symbol in the table is referred to in table 20.
In the present embodiment, the object side surface and the image side surface of each lens are aspherical surfaces, and the surface coefficients and the aspherical coefficients thereof are both aspherical surfaces. The surface coefficients of the lenses in the optical lens 10 according to the present embodiment are shown in table 54.
Table 54 aspherical coefficient of optical lens 10 of the eighteenth embodiment
k | a4 | a6 | a8 | a10 | a12 | a14 | a16 | a18 | a20 | |
R1 | -7.44E-01 | 1.28E-02 | -1.08E-03 | 9.66E-05 | -8.47E-06 | 5.93E-07 | -2.78E-08 | 7.92E-10 | -1.23E-11 | 8.02E-14 |
R2 | -3.01E+01 | 8.56E-03 | 5.05E-05 | -9.61E-05 | 2.38E-05 | -4.06E-06 | 4.30E-07 | -2.57E-08 | 7.91E-10 | -9.73E-12 |
R3 | -4.81E+00 | 6.70E-03 | -2.95E-04 | -4.87E-05 | 3.17E-05 | -8.66E-06 | 1.35E-06 | -1.22E-07 | 5.83E-09 | -1.17E-10 |
R4 | 4.03E+00 | 7.65E-03 | -2.72E-03 | 6.03E-04 | -4.63E-05 | -6.47E-06 | 1.68E-06 | -1.47E-07 | 6.06E-09 | -9.92E-11 |
Stop | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
R5 | -3.17E+00 | -2.25E-03 | -2.73E-03 | -1.77E-03 | 1.45E-03 | -4.23E-04 | 6.57E-05 | -5.79E-06 | 2.73E-07 | -5.40E-09 |
R6 | 3.21E-01 | -4.31E-03 | -6.19E-04 | -4.10E-03 | 2.76E-03 | -8.50E-04 | 1.50E-04 | -1.55E-05 | 8.95E-07 | -2.23E-08 |
R7 | -1.37E+00 | 4.68E-03 | -8.94E-04 | 1.81E-04 | -2.35E-04 | 1.31E-04 | -3.72E-05 | 5.66E-06 | -4.42E-07 | 1.40E-08 |
R8 | 7.88E+00 | -7.02E-04 | -1.16E-04 | 3.91E-05 | 4.89E-06 | 9.75E-08 | -6.60E-08 | -1.22E-08 | -8.78E-10 | 3.54E-10 |
R9 | -5.00E+01 | -3.15E-03 | 4.93E-04 | 4.06E-05 | 1.23E-05 | 1.71E-06 | 1.15E-07 | -6.34E-08 | -1.17E-08 | 8.41E-10 |
R10 | -3.69E+01 | -9.32E-03 | 2.83E-03 | -9.10E-04 | 3.05E-04 | -6.62E-05 | 8.51E-06 | -6.25E-07 | 2.41E-08 | -3.81E-10 |
R11 | -5.57E+00 | -7.00E-03 | -3.00E-02 | 2.45E-03 | 3.36E-03 | -1.29E-03 | 2.14E-04 | -1.84E-05 | 7.87E-07 | -1.31E-08 |
R12 | -1.00E+00 | -2.27E-02 | -3.59E-02 | 2.00E-02 | -4.88E-03 | 6.62E-04 | -5.32E-05 | 2.53E-06 | -6.62E-08 | 7.34E-10 |
In the above table, the meaning of each symbol in the table is referred to in table 21.
In the present embodiment, the surface shape of each of the first lens 11 to the fifth lens 15 is an aspherical surface, and can be defined by the following aspherical surface equation:
in the present embodiment, in the case of the present embodiment,
where z is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, i.e., the distance from a point on the aspheric surface to the optical axis, c is the aspheric apex sphere curvature, K is the quadric constant, and a4, a6, a8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.
Fig. 73 to 75c are graphs showing the optical performance of the optical lens 10 according to the eighteenth embodiment.
Specifically, fig. 73 is a schematic diagram of axial chromatic aberration of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm passing through the optical lens 10 according to the tenth eighth embodiment. Indicating the depth of focus position of the light of different wavelengths on the image side of the optical lens 10 after passing through the optical lens 10. The ordinate of fig. 73 represents the normalized pupil coordinate, and the abscissa represents the aberration in the axial direction in millimeters. As can be seen from fig. 73, in the present embodiment, the axial aberration is controlled to a small extent, and the axial chromatic aberration of the optical lens 10 is well corrected.
Fig. 74 shows a principal ray incidence angle curve of the optical lens 10 of the eighteenth embodiment. The abscissa thereof represents the Image Height (IH) in millimeters (mm); the ordinate thereof indicates the chief ray incidence angle (CRA) in degrees (°). FIG. 74 is a graph depicting the change in the chief ray angle of incidence at different image heights. As can be seen from the figure, in the eighteenth embodiment of the present application, the maximum chief ray incidence angle of the optical lens 10 reaches 28.1 °, and the optical lens 10 of the present embodiment can be adapted to a detector with a large chief ray incidence angle.
Fig. 75a is a temperature drift modulation contrast curve of the optical lens 10 of the eighteenth embodiment at normal temperature (22 ℃); fig. 75b is a temperature drift modulation contrast curve of the optical lens 10 of the eighteenth embodiment at-30 ℃; fig. 75c is a temperature drift modulation contrast curve of the optical lens 10 according to the tenth eighth embodiment at +70 ℃. The abscissa is the spatial frequency in units of: lp/mm. The ordinate is modulation contrast MTF. Each line in the figure represents the modulation contrast versus spatial frequency at a different image height position, respectively. As can be seen from fig. 75a, 75b, and 75c, the modulation contrast of the optical lens 10 is substantially the same at different temperatures, i.e. the optical lens 10 of the present embodiment can clearly image under a wide temperature condition, i.e. the optical lens 10 has smaller temperature drift in a larger temperature variation range, so that the optical lens 10 of the present embodiment can have better imaging effect at different temperatures.
The foregoing is merely 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 think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to 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 (14)
1. The optical lens is characterized by comprising five lenses or six lenses, wherein when the optical lens is provided with five lenses, the five lenses are respectively a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side; when the optical lens has six lenses, the six lenses are a first lens, a second lens, a third lens, a fourth lens, a supplementary lens and a fifth lens which are sequentially arranged from an object side to an image side, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens all comprise an object side face facing the object side and an image side face facing the image side;
the first lens has negative focal power, the second lens has positive focal power, the third lens has positive focal power, the fourth lens has positive focal power, the fifth lens has negative focal power, the fifth lens is an M-shaped lens, and at least one inflection point exists on at least one of an object side surface and an image side surface of the fifth lens;
The aperture value F# of the optical lens satisfies: f# is more than or equal to 0.8 and less than or equal to 2.8;
the relationship between the effective focal length EFFL of the optical lens and the total optical length TTL of the optical lens satisfies the following conditions: EFFL/TTL is more than or equal to 0.2 and less than or equal to 0.9;
the fourth lens can bear the main focal power of the optical lens, at least one of the second lens and the fourth lens is a glass lens, the other lenses of the optical lens are plastic lenses, the refractive index of the glass lenses with the temperature change relation satisfies dn/dT >0, and the refractive index of the plastic lenses with the temperature change relation satisfies dn/dT < 0;
the clear imaging temperature range of the optical lens is-40 ℃ to +85 ℃.
2. The optical lens of claim 1, wherein the object-side surface and the image-side surface of the second lens element are convex at the paraxial region, and the object-side surface and the image-side surface of the fourth lens element are convex at the paraxial region.
3. The optical lens of claim 1 or 2, wherein the object side surface of the first lens element is concave at the paraxial region.
4. The optical lens of claim 1 or 2, wherein the object-side surface of the third lens element is convex at the paraxial region and the image-side surface of the third lens element is concave at the paraxial region.
5. The optical lens according to claim 1 or 2, wherein the focal length f of the fourth lens 4 The relationship with the focal length EFFL of the optical lens satisfies: f is more than or equal to 0.5 4 /EFFL≤2.0。
6. The optical lens according to claim 1 or 2, wherein the relation between the effective focal length EFFL of the optical lens and the maximum image height IH of the optical lens satisfies: EFFL/IH is more than or equal to 0.4 and less than or equal to 2.0.
7. The optical lens according to claim 1 or 2, wherein the relation between the effective focal length EFFL, the aperture value f# and the total optical length TTL of the optical lens satisfies: EFFL/(F#. Times.TTL) of 0.1 to 0.5.
8. The optical lens according to claim 1 or 2, wherein the relation between the effective focal length EFFL, the total optical length TTL, the maximum image height IH and the f# of the optical lens satisfies: (IH X EFFL)/(F#. Times.TTL) 2 )≤0.3。
9. An optical lens according to claim 1 or 2, characterized in that the field angle FOV of the optical lens satisfies 40 ° -140 °.
10. The optical lens according to claim 1 or 2, characterized in that the abbe number v2 of the second lens and the abbe number v3 of the third lens satisfy the relation: the I v2-v 3I is more than or equal to 15.
11. The optical lens according to claim 1 or 2, characterized in that the abbe number v4 of the fourth lens and the abbe number v3 of the third lens satisfy the relation: the V4-V3I is more than or equal to 15.
12. The optical lens according to claim 1 or 2, characterized in that the supplemental lens has optical power, and the abbe number v5 of the supplemental lens and the abbe number v4 of the fourth lens satisfy the relationship: the V4-V5I is more than or equal to 15.
13. A camera module comprising a photosensitive element and an optical lens according to any one of claims 1 to 12, the photosensitive element being located on an image side of the optical lens, the photosensitive element being configured to convert an optical signal transmitted through the optical lens into an electrical signal.
14. An electronic device comprising an image processor and the camera module of claim 13, the image processor being communicatively coupled to the camera module, the camera module being configured to obtain image data and input the image data into the image processor, the image processor being configured to process the image data output therefrom.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202010615939.4A CN113866936B (en) | 2020-06-30 | 2020-06-30 | Optical lens, camera module and electronic equipment |
PCT/CN2021/098725 WO2022001589A1 (en) | 2020-06-30 | 2021-06-07 | Optical lens, camera module, and electronic device |
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JP4760109B2 (en) * | 2005-04-22 | 2011-08-31 | コニカミノルタオプト株式会社 | Imaging lens, imaging device, and portable terminal |
CN101641739A (en) * | 2007-03-28 | 2010-02-03 | 柯尼卡美能达精密光学株式会社 | Objective optical element unit for optical pickup device, and optical pickup device |
CN102023370B (en) * | 2009-09-15 | 2012-05-23 | 大立光电股份有限公司 | Imaging lens system |
US8786957B2 (en) * | 2011-07-01 | 2014-07-22 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus including the same |
JP6265334B2 (en) * | 2014-03-20 | 2018-01-24 | 株式会社オプトロジック | Imaging lens |
CN110568589B (en) * | 2016-08-26 | 2021-09-24 | 大立光电股份有限公司 | Image lens, image capturing device and electronic device |
TWI644141B (en) * | 2016-10-14 | 2018-12-11 | 大立光電股份有限公司 | Optical imaging module, image capturing apparatus and electronic device |
CN107065126A (en) * | 2016-12-23 | 2017-08-18 | 捷西迪(广州)光学科技有限公司 | A kind of lens devices |
US10962691B2 (en) * | 2017-03-06 | 2021-03-30 | Omnivision Technologies, Inc. | Athermal doublet lens with large thermo-optic coefficients |
CN108051899B (en) * | 2017-12-27 | 2024-10-22 | 江西联创电子有限公司 | Image pickup lens |
TWI641864B (en) * | 2018-01-24 | 2018-11-21 | 大立光電股份有限公司 | Photographing lens assembly, image capturing unit and electronic device |
CN109870787B (en) * | 2019-03-20 | 2020-11-17 | 江西联益光学有限公司 | Optical imaging lens |
CN110187483B (en) * | 2019-06-03 | 2021-07-13 | 贵州旭业光电有限公司 | Wide-angle lens and electronic equipment |
CN110361842B (en) * | 2019-06-30 | 2021-10-19 | 瑞声光学解决方案私人有限公司 | Image pickup optical lens |
CN110749981B (en) * | 2019-11-22 | 2021-11-12 | 诚瑞光学(常州)股份有限公司 | Image pickup optical lens |
CN111158126B (en) * | 2020-04-02 | 2020-08-14 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
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CN113866936A (en) | 2021-12-31 |
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