Ultra-thin imaging lens

Abstract

The utility model discloses an ultra-thin imaging lens, and belongs to the technical field of imaging lenses. An ultra-thin imaging lens comprises a first lens, a second lens and a third lens, object side surfaces and image side surfaces of the first lens, the second lens and the third lens are aspheric surfaces, and the ultra-thin imaging lens further comprises a diaphragm arranged between the second lens and the third lens; according to the utility model, a three-lens type design composed of the first lens, the second lens, the third lens and the diaphragm is adopted, and the surface shape structure of each lens is combined with the optimization range of optical parameters, so that the whole lens is lighter and thinner; according to the lens, the overall size of the lens can be effectively shortened and the visual angle of the lens can be effectively improved under the condition of maintaining high imaging quality, so that the lens has the characteristics of high resolution, wide visual angle and large aperture, and can be better adapted to small or thin portable electronic imaging devices.

Description

Technical Field

[0003]

[0001] The utility model relates to the technical field of imaging lenses, in particular to an ultra-thin imaging lens. Background Art

[0002] With the development of technology, people's requirements for electronic products are increasing, and the requirements for the thickness of electronic products are also thinner and lighter. Moreover, for the imaging lenses attached to electronic products, there are requirements for being thinner and lighter, smaller in volume, and more diverse in functions.

[0003] Currently, in the use of the imaging lenses attached to electronic products, since the lenses are usually composed of multiple lens elements, the overall lens is relatively heavy, resulting in the inability to effectively shorten the overall size of the imaging lens and increase its lens viewing angle, and thus it cannot be better equipped for the use of small or thin portable electronic products. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem in the prior art that the overall imaging lens is relatively heavy, and thus it cannot be better adapted for the use of small or thin portable electronic products, and to propose an ultra-thin imaging lens.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] An ultra-thin imaging lens includes a first lens, a second lens, and a third lens. The object side and the image side of the first lens, the second lens, and the third lens are all aspherical surfaces. It also includes an aperture stop disposed between the second lens and the third lens. Among them, the first lens has a negative refractive power, the second lens and the third lens both have positive refractive powers. The object side of the first lens is concave at the paraxial region, the object side of the second lens is convex, and the image side of the third lens is convex. The ultra-thin imaging lens satisfies the following relational expressions: 0.227 < f / R4 < 0.259, 30 < V1 - V2 < 33, where f is the focal length of the high-definition optical imaging lens, R4 is the radius of curvature of the image side of the second lens, V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

[0007] In order to select the range of the radius of curvature of the object side and the image side of the first lens, preferably, the ultra-thin imaging lens satisfies the following relational expression: -1 < (R1 + R2) / (R1 - R2) < 1, where R1 is the radius of curvature of the object side of the first lens and R2 is the radius of curvature of the image side of the first lens.

[0008] In order to select the range of the focal length of the first lens and the radius of curvature of its object side, preferably, the ultra-thin imaging lens satisfies the following relational expression: 0.01 < f1 / R1 < 0.03, where f1 is the focal length of the first lens.

[0009] To select the center thickness ranges of the first lens and the second lens, preferably, the ultra-thin imaging lens satisfies the following relational expression: 0.2 < ct1 / ct2 < 0.5, where ct1 is the center thickness of the first lens and ct2 is the center thickness of the second lens.

[0010] To select the ranges of the overall optical length of the imaging optical lens and the focal length of the high-definition optical imaging lens, preferably, the ultra-thin imaging lens satisfies the following relational expression: 5.0 < TTL / f < 5.3, where TTL is the overall optical length of the imaging optical lens.

[0011] To select the ranges of the distance between the object-side vertex of the first lens and the imaging surface and the diagonal length of the image formed by the maximum usable viewing angle of the lens group on the image surface, preferably, the ultra-thin imaging lens satisfies the following relational expression: 1.3 < TL / Dg < 1.6, where TL is the distance between the object-side vertex of the first lens and the imaging surface, and Dg is the diagonal length of the image formed by the maximum usable viewing angle of the lens group on the image surface.

[0012] To select the ranges 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 ultra-thin imaging lens satisfies the following relational expression: -6.2 < F12 / F3 < -2.3, where F12 is the focal length of the combination of the first lens and the second lens, and F3 is the focal length of the third lens.

[0013] To select the ranges of the focal length of the second lens and the curvature radius of its object-side surface, preferably, the ultra-thin imaging lens satisfies the following relational expression: 1.6 < f2 / R3 < 1.8, where f2 is the focal length of the second lens 2, and Rl is the curvature radius of the object-side surface of the second lens.

[0014] To select the ranges of the focal length of the third lens and the curvature radius of its image-side surface, preferably, the ultra-thin imaging lens satisfies the following relational expression: -2.6 < f3 / R6 < 1.3, where R6 is the curvature radius of the image-side surface of the third lens.

[0015] Compared with the prior art, the present utility model provides an ultra-thin imaging lens, which has the following beneficial effects:

[0016] 1. For the ultra-thin imaging lens, by adopting a three-lens design composed of a first lens, a second lens, a third lens and an aperture, and combining the optimal range of the surface shape structure and optical parameters of each lens, the overall lens is made thinner and lighter. It can effectively shorten the overall size of the lens and increase its lens viewing angle while maintaining high imaging quality, thereby enabling the lens to have the characteristics of high resolution, wide viewing angle and large aperture, and thus being able to better adapt to the use of small or thin portable electronic imaging devices.

[0017] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model solves the problem that in the prior art, the imaging lens is relatively thick and heavy, thus it cannot be better adapted to small or thin portable electronic products. Attached Figure Description

[0018] Figure 1 This is an exploded planar view of an ultra-thin imaging lens proposed in this utility model;

[0019] Figure 2 The present invention proposes a distortion reduction method for an ultra-thin imaging lens. Figure 1 ;

[0020] Figure 3 An axial chromatic aberration curve for an ultra-thin imaging lens proposed in this utility model. Figure 1 ;

[0021] Figure 4 The present invention proposes a distortion reduction method for an ultra-thin imaging lens. Figure 2 ;

[0022] Figure 5 An axial chromatic aberration curve for an ultra-thin imaging lens proposed in this utility model. Figure 2 ;

[0023] Figure 6 The present invention proposes a distortion reduction method for an ultra-thin imaging lens. Figure 3 ;

[0024] Figure 7 An axial chromatic aberration curve for an ultra-thin imaging lens proposed in this utility model. Figure 3 ;

[0025] Figure 8 The present invention proposes a distortion reduction method for an ultra-thin imaging lens. Figure 4 ;

[0026] Figure 9 An axial chromatic aberration curve for an ultra-thin imaging lens proposed in this utility model. Figure 4 ;

[0027] Figure 10 The present invention proposes a distortion reduction method for an ultra-thin imaging lens. Figure 5 ;

[0028] Figure 11 An axial chromatic aberration curve for an ultra-thin imaging lens proposed in this utility model. Figure 5 .

[0029] In the diagram: 1. First lens; 2. Second lens; 3. Third lens; 4. Aperture. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0031] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Example 1:

[0033] Reference Figure 1 This utility model provides an ultra-thin imaging lens, including a first lens 1, a second lens 2, and a third lens 3. The object-side and image-side surfaces of the first lens 1, second lens 2, and third lens 3 are all aspherical. It also includes an aperture stop 4 disposed between the second lens 2 and the third lens 3. The aperture stop 4 is used in the lens to control the amount of light passing through. The first lens 1 has negative refractive power, while the second lens 2 and third lens 3 both have positive refractive power. This positive and negative refractive power causes the incident light to diffuse outward, expanding the field of view and reducing distortion. The optical performance of the entire system can be optimized. 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. The ultra-thin imaging lens satisfies the following relationship: 0.227 < f / R4 < 0.259, which allows the selection of 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; 30 < V1 - V2 < 33, which allows the selection of the range of Abbe number of the first lens 1 and the second lens 2. The higher the Abbe number, the less chromatic aberration and the better the image quality.

[0034] Specifically, 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 by combining the optimized range of the surface structure and optical parameters of each lens, the overall lens becomes thinner and lighter. This allows for the effective reduction of the overall size of the lens and the improvement of its angle of view while maintaining high image quality. As a result, the lens has the characteristics of high resolution, wide angle of view, and large aperture, thus making it better suited for use in small or thin portable electronic imaging devices.

[0035] The ultra-thin imaging lens described above satisfies the following relationship: -1<(R1+R2) / (R1-R2)<1.

[0036] Specifically, the range of curvature radii of the object side and the phase side of the first lens 1 can be selected by means of numerical range.

[0037] The aforementioned ultra-thin imaging lens satisfies the following relationship: 0.01 <f1 / R1<0.03。

[0038] Specifically, the range of the focal length of the first lens 1 and the radius of curvature of its object side surface can be selected by means of numerical range.

[0039] The aforementioned ultra-thin imaging lens satisfies the following relationship: 0.2 <ct1 / ct2<0.5。

[0040] Specifically, the center thickness range of the first lens 1 and the second lens 2 can be selected by using the numerical range.

[0041] The aforementioned ultra-thin imaging lens satisfies the following relationship: 5.0 <TTL / f<5.3。

[0042] Specifically, by using numerical ranges, the range of the total optical length of the camera lens and the focal length of the high-definition optical imaging lens can be selected.

[0043] The aforementioned ultra-thin imaging lens satisfies the following relationship: 1.3 <TL / Dg<1.6。

[0044] Specifically, by using a numerical range, it is possible to select the range between the distance between the object-side vertex of the first lens 1 and the imaging plane and the diagonal length of the image plane at the maximum usable viewing angle of the lens group.

[0045] The aforementioned ultra-thin imaging lens satisfies the following relationship: -6.2 <F12 / F3<-2.3。

[0046] Specifically, by using numerical ranges, the range of focal lengths of the combination of the first lens 1 and the second lens 2 and the third lens 3 can be selected.

[0047] The aforementioned ultra-thin imaging lens satisfies the following relationship: 1.6 <f2 / R3<1.8。

[0048] Specifically, the range of the focal length of the second lens 2 and the radius of curvature of its object side surface can be selected by means of numerical range.

[0049] The aforementioned ultra-thin imaging lens satisfies the following relationship: -2.6 <f3 / R6<1.3。

[0050] Specifically, the range of the focal length of the third lens 3 and the radius of curvature of its image side can be selected by using numerical ranges.

[0051] The meanings of "alphanumeric" in this utility model are as follows:

[0052] f: Focal length of the high-definition optical imaging lens;

[0053] R4: Radius of curvature of the image side of the second lens 2;

[0054] V1: Abbe number of the first lens;

[0055] V2: Abbe number of the second lens;

[0056] R1: Radius of curvature of the object-side surface of the first lens 1;

[0057] R2: Radius of curvature of the image side of the first lens 1;

[0058] f1: Focal length of the first lens 1;

[0059] TTL: Total optical length of a camera lens;

[0060] CT1: Center thickness of the first lens 1;

[0061] CT2: Center thickness of the second lens 2;

[0062] TL: The distance between the object-side vertex of the first lens 1 and the imaging plane;

[0063] Dg: The diagonal length of the image formed on the image plane at the maximum usable viewing angle of the lens group;

[0064] f12: The focal length of the combination of the first lens 1 and the second lens 2;

[0065] f3: Focal length of the third lens 3;

[0066] f2: Focal length of the second lens 2;

[0067] R3: Radius of curvature of the object-side surface of the second lens 2;

[0068] R6: Radius of curvature of the image-side surface of the third lens 3.

[0069] Example 2:

[0070] Based on Example 1, the specific parameters selected as f=0.78mm, Fno=2.35, FOV=160.70°, and the aspheric coefficient are shown in the following table:

[0071]

[0072]

[0073] Specifically, the data in the table above can be used to generate... Figure 2 and Figure 3 .

[0074] Example 3:

[0075] Based on Example 1, the specific parameters selected were f=0.76mm, Fno=2.34, FOV=160.26°, and the aspheric coefficient, resulting in the following table:

[0076]

[0077]

[0078] Specifically, the data in the table above can be used to generate... Figure 4 and Figure 5 .

[0079] Example 4:

[0080] Based on Example 1, the specific parameters selected were f=0.78mm, Fno=2.35, FOV=160.87°, and the aspheric coefficient, resulting in the following table:

[0081]

[0082]

[0083] Specifically, the data in the table above can be used to generate... Figure 6 and Figure 7 .

[0084] Example 5:

[0085] Based on Example 1, the specific parameters selected as f=0.78mm, Fno=2.32, FOV=139.72°, and aspheric coefficient are shown in the following table:

[0086]

[0087]

[0088] Specifically, the data in the table above can be used to generate... Figure 8 and Figure 9 .

[0089] Example 6:

[0090] Based on Example 1, the specific parameters selected were f=0.79mm, Fno=2.34, FOV=160.78°, and the aspheric coefficient, resulting in the following table:

[0091]

[0092]

[0093] Specifically, the data in the table above can be used to generate... Figure 10 and Figure 11 .

[0094] In the table above: 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.

[0095] This utility model is achieved through... Figure 2 , Figure 4 , Figure 6 , Figure 8 as well as Figure 10 By comparing the changes in the distortion curves, we can conclude that the magnitude of the distortion of an object after it is imaged through a lens is such that the closer the distortion curve is to 0, the closer the shape of the image is to the shape of the object.

[0096] And, through Figure 3 , Figure 5 , Figure 7 , Figure 9 as well as Figure 11 The comparison of the changes in the central axis chromatic aberration curves shows that each curve represents the focal point of light of different wavelengths after passing through the lens, and the closer the different curves are, the better the lens's chromatic aberration effect.

[0097] This ultra-thin imaging lens employs a three-lens design consisting of a first lens 1, a second lens 2, a third lens 3, and an aperture 4. By combining the optimized surface structure and optical parameters of each lens, the overall lens becomes thinner and lighter. This allows for the effective reduction of the overall size of the lens and the improvement of its angle of view while maintaining high image quality. Consequently, the lens possesses the characteristics of high resolution, wide angle of view, and large aperture, making it better suited for use in small or thin portable electronic imaging devices.

[0098] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

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 and the image side of the first lens (1), the second lens (2), and the third lens (3) are both aspherical surfaces. An aperture stop (4) is further included and disposed between the second lens (2) and the third lens (3). Among them, the first lens (1) has a negative refractive power, the second lens (2) and the third lens (3) both have positive refractive powers. The object side of the first lens (1) is concave at the paraxial region. The object side of the second lens (2) is convex. The image side of the third lens (3) is convex. The ultra-thin imaging lens satisfies the following relationships: 0.227 < f / R4 < 0.259, 30 < V1 - V2 < 33, where f is the focal length of the high-definition optical imaging lens, R4 is the radius of curvature of the image side of the second lens (2), V1 is the Abbe number of the first lens (1), and V2 is the Abbe number of the second lens (2).

2. The ultra-thin imaging lens according to claim 1, wherein, The ultra-thin imaging lens satisfies the following relationship: -1 < (R1 + R2) / (R1 - R2) < 1, where R1 is the radius of curvature of the object side of the first lens (1), and R2 is the radius of curvature of the image side of the first lens (1).

3. The ultra-thin imaging lens according to claim 2, wherein, The ultra-thin imaging lens satisfies the following relationship: 0.01 < f1 / R1 < 0.03, where f1 is the focal length of the first lens (1).

4. The ultra-thin imaging lens according to claim 1, wherein, The ultra-thin imaging lens satisfies the following relationship: 0.2 < ct1 / ct2 < 0.5, where ct1 is the central thickness of the first lens (1), and ct2 is the central thickness of the second lens ().

5. The ultra-thin imaging lens according to claim 1, wherein, The ultra-thin imaging lens satisfies the following relationship: 5.0 < TTL / f < 5.3, where TTL is the total optical length of the imaging optical lens.

6. The ultra-thin imaging lens according to claim 1, wherein, The ultra-thin imaging lens satisfies the following relationship:

1. < TL / Dg < 1.6, where TL is the distance from the vertex on the object side of the first lens (1) to the imaging surface, and Dg is the diagonal length of the image formed by the maximum usable viewing angle of the lens group on the image surface.

7. The ultra-thin imaging lens according to claim 1, wherein, The ultra-thin imaging lens satisfies the following relationship: -6.2 < F12 / F3 < -2.3, where F12 is the focal length of the combination of the first lens (1) and the second lens (2), and F3 is the focal length of the third lens (3).

8. The ultra-thin imaging lens according to claim 1, wherein, The ultra-thin imaging lens satisfies the following relationship: 1.6 < f2 / R3 < 1.8, where f2 is the focal length of the second lens (2), and R3 is the radius of curvature of the object side of the second lens (2).

9. The ultra-thin imaging lens according to claim 7, wherein, The ultra-thin imaging lens satisfies the following relationship: -2.6 < f3 / R6 < 1.3, where R6 is the radius of curvature of the image side of the third lens (3).

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