Ultra-thin imaging lens
By adopting a three-lens design and optimized surface structure and optical parameters in the imaging lens, combined with the aperture, the problem of heavy existing imaging lenses is solved, and a thinner, higher resolution and wider viewing angle lens is achieved, suitable for small or thin portable electronic products.
Patent Information
- Application Number
- CN202510236848.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2025-03-28
AI Technical Summary
Due to its heavy weight, existing imaging lenses are difficult to adapt to small or thin portable electronic products, and cannot effectively shorten the lens size or increase the viewing angle.
A three-lens design including a first lens, a second lens and a third lens is adopted, and the surface-shaped structure and optical parameters of each lens are optimized, and the aperture is combined to control the amount of light passing.
It realizes that the overall lens is lighter and thinner, maintains high imaging quality while shortening the lens size and improving the viewing angle. It has the characteristics of high resolution, wide viewing angle and large aperture, and is suitable for small or thin portable electronic imaging devices.
Smart Images
Figure CN119717226A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of imaging lenses, and in particular to an ultra-thin imaging lens. Background Art
[0002] With the development of science and technology, people's requirements for electronic products are getting higher and higher. The thickness of electronic products is also required to be thinner and lighter. In addition, the imaging lenses attached to electronic products need to be thinner, lighter in size, and more functional.
[0003] The imaging lenses currently attached to electronic products are generally composed of multiple layers of lens sheets, which makes the lenses as a whole relatively thick and heavy. This makes it impossible to effectively shorten the overall size of the imaging lenses and improve their viewing angles, thereby failing to better equip small or thin portable electronic products. Summary of the invention
[0004] The purpose of the present invention is to solve the problem in the prior art that the imaging lens is relatively thick and heavy, and thus cannot be better adapted to small or thin portable electronic products, and to propose an ultra-thin imaging lens.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An ultra-thin imaging lens comprises a first lens, a second lens and a third lens, wherein the object side surfaces and image side surfaces of the first lens, the second lens and the third lens are all aspherical surfaces, and further comprises an aperture arranged between the second lens and the third lens, wherein the first lens has negative refractive power, the second lens and the third lens both have positive refractive power, the object side surface of the first lens is concave at the paraxial position, the object side surface of the second lens is convex, the image side surface of the third lens is convex, the 0.227<f / R4<0.259, and the 30<V1-V2<33.
[0006] In order to select the range of the curvature radii of the object-side surface and the object-side surface of the first lens, preferably, -1<(R1+R2) / (R1-R2)<1.
[0007] In order to select the range of the focal length of the first lens and the radius of curvature of the object side surface thereof, preferably, the 0.01 <f1 / R1<0.03。
[0008] In order to select the central thickness range of the first lens and the second lens, preferably, the 0.2 <ct1 / ct2<0.5。
[0009] In order to select the range of the total optical length of the camera optical lens and the focal length of the high-definition optical imaging lens, preferably, the 5.0 <TTL / f<5.3。
[0010] In order to select the range of the distance between the object side vertex of the first lens and the imaging plane and the diagonal length of the maximum viewing angle of the lens group on the imaging plane, preferably, the 1.3 <TL / Dg<1.6。
[0011] In order to select the range of the focal length of the combination of the first lens and the second lens and the focal length of the third lens, preferably, the -6.2 <F12 / F3<-2.3。
[0012] In order to select the range of the focal length of the second lens and the radius of curvature of the object side surface thereof, preferably, the 1.6 <f2 / R3<1.8。
[0013] In order to select the range of the focal length of the third lens and the curvature radius of its image side surface, preferably, the -2.6 <f3 / R6<1.3。
[0014] Compared with the prior art, the present invention provides an ultra-thin imaging lens having the following beneficial effects: 1. The ultra-thin imaging lens adopts a three-lens design consisting of a first lens, a second lens, a third lens and an aperture, and combines the surface structure of each lens with the optimization range of optical parameters to make the lens as a whole lighter and thinner. It can effectively shorten the overall size of the lens and improve its lens viewing angle while maintaining high imaging quality, thereby making the lens have the characteristics of high resolution, wide viewing angle and large aperture, so that it can be better adapted to the use of small or thin portable electronic imaging devices.
[0015] The parts not involved in the device are the same as the prior art or can be implemented by using the prior art. The present invention solves the problem in the prior art that the imaging lens is relatively thick and heavy as a whole, so it cannot be better adapted to small or thin portable electronic products. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a plane exploded view of an ultra-thin imaging lens proposed by the present invention; Figure 2 Distortion of an ultra-thin imaging lens proposed by the present invention Figure 1 ; Figure 3 Axial chromatic aberration curve of an ultra-thin imaging lens proposed by the present invention Figure 1 ; Figure 4 Distortion of an ultra-thin imaging lens proposed by the present invention Figure 2 ; Figure 5 Axial chromatic aberration curve of an ultra-thin imaging lens proposed by the present invention Figure 2 ; Figure 6Distortion of an ultra-thin imaging lens proposed by the present invention Figure 3 ; Figure 7 Axial chromatic aberration curve of an ultra-thin imaging lens proposed by the present invention Figure 3 ; Figure 8 Distortion of an ultra-thin imaging lens proposed by the present invention Figure 4 ; Fig. 9 Axial chromatic aberration curve of an ultra-thin imaging lens proposed by the present invention Figure 4 ; Fig.10 Distortion of an ultra-thin imaging lens proposed by the present invention Figure 5 ; Fig.11 Axial chromatic aberration curve of an ultra-thin imaging lens proposed by the present invention Figure 5 .
[0017] In the figure: 1, first lens; 2, second lens; 3, third lens; 4, aperture. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0019] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0020] Embodiment 1: Reference Figure 1The embodiment of the present invention provides an ultra-thin imaging lens, comprising a first lens 1, a second lens 2 and a third lens 3, wherein the object side surfaces and the image side surfaces of the first lens 1, the second lens 2 and the third lens 3 are all aspherical surfaces, and further comprising an aperture 4 disposed between the second lens 2 and the third lens 3, wherein the aperture 4 is used in the lens to control the amount of light passing therethrough, wherein the first lens 1 has a negative refractive power, and the second lens 2 and the third lens 3 both have a positive refractive power, and the positive and negative refractive powers can cause the incident light to diffuse outward, thereby expanding the field of view angle, Distortion is reduced, thereby optimizing the optical performance of the entire system. The object side surface of the first lens 1 is concave at the paraxial position, the object side surface of the second lens 2 is convex, and the image side surface of the third lens 3 is convex. 0.227<f / R4<0.259, the focal length of the high-definition optical imaging lens and the radius of curvature of the image side surface of the second lens 2 can be selected, 30<V1-V2<33, the range of the Abbe number of the first lens 1 and the Abbe number of the second lens 2 can be selected, wherein the higher the Abbe number, the less chromatic aberration and the better the image quality.
[0021] Specifically, when in use, by adopting a three-lens design consisting of a first lens 1, a second lens 2, a third lens 3 and an aperture 4, and combining the surface structure of each lens with the optimization range of optical parameters, the lens as a whole is made thinner and lighter, and the overall size of the lens can be effectively shortened and its lens viewing angle can be improved while maintaining high imaging quality, thereby making the lens have the characteristics of high resolution, wide viewing angle and large aperture, so that it can be better adapted to the use of small or thin portable electronic imaging devices.
[0022] The above -1<(R1+R2) / (R1-R2)<1.
[0023] Specifically, the range of the curvature radii of the object-side surface and the phase-side surface of the first lens 1 can be selected through the numerical interval.
[0024] Above 0.01 <f1 / R1<0.03。
[0025] Specifically, the range of the focal length of the first lens 1 and the radius of curvature of the object side surface thereof can be selected through the numerical interval.
[0026] Above 0.2 <ct1 / ct2<0.5。
[0027] Specifically, the center thickness range of the first lens 1 and the second lens 2 can be selected through the numerical range.
[0028] Above 5.0 <TTL / f<5.3。
[0029] Specifically, the range of the total optical length of the camera optical lens and the focal length of the high-definition optical imaging lens can be selected through the numerical range.
[0030] 1.3 above <TL / Dg<1.6。
[0031] Specifically, through the numerical interval, the range of the distance between the object side vertex of the first lens 1 and the imaging plane and the diagonal length of the maximum viewing angle of the lens group on the image plane can be selected.
[0032] Above - 6.2 <F12 / F3<-2.3。
[0033] Specifically, through the numerical interval, the range of the focal length of the combination of the first lens 1 and the second lens 2 and the focal length of the third lens 3 can be selected.
[0034] 1.6 above <f2 / R3<1.8。
[0035] Specifically, through the numerical interval, the range of the focal length of the second lens 2 and the radius of curvature of the object side surface thereof can be selected.
[0036] Above - 2.6 <f3 / R6<1.3。
[0037] Specifically, the range of the focal length of the third lens 3 and the radius of curvature of the image-side surface thereof can be selected through the numerical interval.
[0038] The meanings of “alphanumeric values” in the present invention are as follows: f: focal length of high-definition optical imaging lens; R4: the radius of curvature of the image side of the second lens 2; V1: Abbe number of the first lens 1; V2: Abbe number of the second lens 2; R1: the radius of curvature of the object side surface of the first lens 1; R2: the radius of curvature of the image side of the first lens 1; f1: focal length of the first lens 1; TTL: total optical length of the camera optical lens; CT1: center thickness of the first lens 1; CT2: center thickness of the second lens 2; TL: the distance between the object side vertex of the first lens 1 and the imaging surface; Dg: The diagonal length of the image plane at the maximum viewing angle of the lens group; f12: focal length of the first lens 1 and the second lens 2 combined; f3: focal length of the third lens 3; f2: focal length of the second lens 2; R3: the radius of curvature of the object side surface of the second lens 2; R6: the curvature radius of the image-side surface of the third lens 3 .
[0039] Embodiment 2: Based on the first embodiment, the specific parameters selected are f=0.78mm, Fno=2.35, FOV=160.70° and aspheric coefficient to obtain the following table: Specifically, through the data in the above table, it is possible to generate Figure 2 and Figure 3 .
[0040] Embodiment three: Based on the first embodiment, the specific parameters selected are f=0.76mm, Fno=2.34, FOV=160.26° and aspheric coefficient to obtain the following table: Specifically, through the data in the above table, it is possible to generate Figure 4 and Figure 5 .
[0041] Embodiment 4: Based on the first embodiment, the specific parameters selected are f=0.78mm, Fno=2.35, FOV=160.87° and aspheric coefficient to obtain the following table: Specifically, through the data in the above table, it is possible to generate Figure 6 and Figure 7 .
[0042] Embodiment five: Based on the first embodiment, the specific parameters selected are f=0.78mm, Fno=2.32, FOV=139.72° and aspheric coefficient to obtain the following table: Specifically, through the data in the above table, it is possible to generate Figure 8 and Fig. 9 .
[0043] Embodiment six: Based on the first embodiment, the specific parameters selected are f=0.79mm, Fno=2.34, FOV=160.78° and aspheric coefficient to obtain the following table: Specifically, through the data in the above table, it is possible to generate Fig.10 and Fig.11 .
[0044] In the above table: f represents focal length, Fno represents aperture number, and FOV represents field of view. These three parameters work together in the design of high-pixel telephoto cameras to ensure that users can obtain high-quality images.
[0045] The present invention is achieved by Figure 2 , Figure 4 , Figure 6 , Figure 8 as well as Fig.10 The comparison of the changes in the distortion curves shows that the size of the deformation of the object after being imaged by the lens is that the closer the distortion curve is to 0, the closer the image shape is to the shape of the object; And, through Figure 3 , Figure 5 , Figure 7 , Fig. 9 as well as Fig.11 The mutual comparison of the changes in the central axial chromatic aberration curves shows that each curve represents the focal position of light of different wavelengths after passing through the lens, and the closer the different curves are, the better the chromatic aberration effect of the lens.
[0046] The ultra-thin imaging lens adopts a three-lens design consisting of a first lens 1, a second lens 2, a third lens 3 and an aperture 4. At the same time, the surface structure of each lens is combined with the optimization range of optical parameters to make the lens as a whole lighter and thinner. The overall size of the lens can be effectively shortened and its lens viewing angle can be improved while maintaining high imaging quality, thereby making the lens have the characteristics of high resolution, wide viewing angle and large aperture, so that it can be better adapted to the use of small or thin portable electronic imaging devices.
[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. An ultra-thin imaging lens, comprising a first lens (1), a second lens (2) and a third lens (3), characterized in that: The object side surfaces and image side surfaces of the first lens (1), the second lens (2) and the third lens (3) are all aspherical surfaces, and further include a stop (4) arranged between the second lens (2) and the third lens (3). The first lens (1) has negative refractive power, the second lens (2) and the third lens (3) both have positive refractive power, the object side surface of the first lens (1) is concave at the paraxial position, the object side surface of the second lens (2) is convex, the image side surface of the third lens (3) is convex, 0.227<f / R4<0.259, and 30<V1-V2<33.
2. The ultra-thin imaging lens according to claim 1, characterized in that: The -1<(R1+R2) / (R1-R2)<1.
3. The ultra-thin imaging lens according to claim 1, characterized in that: 0.01 <f1 / R1<0.03。 4. The ultra-thin imaging lens according to claim 1, characterized in that: 0.2 <ct1 / ct2<0.5。 5. The ultra-thin imaging lens according to claim 1, characterized in that: 5.0 <TTL / f<5.3。 6. The ultra-thin imaging lens according to claim 1, characterized in that: 1.3 <TL / Dg<1.6。 7. The ultra-thin imaging lens according to claim 1, characterized in that: -6.2 <F12 / F3<-2.3。 8. The ultra-thin imaging lens according to claim 1, characterized in that: 1.6 <f2 / R3<1.8。 9. The ultra-thin imaging lens according to claim 1, characterized in that: Said-2.6 <f3 / R6<1.3。