Glass-plastic mixed lens for motion camera

Abstract

The invention discloses a glass-plastic mixed lens for a motion camera, and belongs to the technical field of camera lenses. A glass-plastic hybrid lens for a motion camera comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the object side surface and the image side surface of the fifth lens are spherical surfaces, and the object side surfaces and the image side surfaces of the first lens, the second lens, the third lens, the fourth lens and the sixth lens are aspheric surfaces; according to the invention, the glass-plastic mixed six-lens design composed of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the diaphragm is adopted, and under the combination of the surface shape structure of each lens and the optimal range of optical parameters, high resolution, low distortion and good color rendition can be realized. The weight of the lens is reduced, the light weight is realized, the cost can be reduced, and the adaptability of the lens in a high-temperature and high-humidity environment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of camera lenses, and particularly to a hybrid glass and plastic lens for an action camera. Background Art

[0002] An action camera is a small and rugged digital camera designed specifically for shooting dynamic scenes and extreme sports. Through the camera lens, stable imaging performance can be maintained in high-dynamic environments (such as high-speed movement, vibration, temperature difference changes, etc.) to facilitate outdoor shooting and framing.

[0003] Currently, traditional lenses mostly adopt an all-glass lens design. Although the imaging quality is high, the weight is large, which is not conducive to the portability of action cameras. While the all-plastic lens design is light in weight, it is prone to deformation in high-temperature and high-humidity environments, affecting imaging stability. Therefore, to solve the above-mentioned problems, a hybrid glass and plastic lens is provided to meet the requirements of action cameras for high imaging quality, light weight, and adaptability to high-temperature and high-humidity environments. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the existing action camera lenses are difficult to meet the requirements of high imaging quality, light weight, and adaptability to high-temperature and high-humidity environments, and to propose a hybrid glass and plastic lens for an action camera.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A hybrid glass and plastic lens for an action camera includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The object side and the image side of the fifth lens are both spherical surfaces, and the object side and the image side of the first lens, the second lens, the third lens, the fourth lens, and the sixth lens are all aspherical surfaces. It also includes a diaphragm disposed between the second lens and the third lens. Among them, the first lens, the fourth lens, and the sixth lens all have negative refractive powers, the second lens, the third lens, and the fifth lens all have positive refractive powers. The object side of the first lens is convex at the paraxial region, the object side of the fourth lens and the image side of the fourth lens are both concave at the paraxial region, the object sides of the second lens and the third lens are both convex, the image sides of the third lens and the fifth lens are both convex, 0.13 < f / R4 < 0.16, and 3.18 < V4 + V5 < 3.23.

[0006] To select a suitable parameter range for the lens, preferably, 0.31 < (R2 + R3) / (R2 - R3) < 0.38.

[0007] To select a suitable parameter range for the lens, preferably, -7.30 < f6 / R6 < -6.29.

[0008] To select a suitable parameter range for the lens, preferably, \(0.73 < ct1 / ct2 < 0.76\).

[0009] To select a suitable parameter range for the lens, preferably, \(3.62 < TL / f < 3.97\).

[0010] To select a suitable parameter range for the lens, preferably, \(2.81 < TL / Dg < 3.46\).

[0011] To select a suitable parameter range for the lens, preferably, \(0.05 < f45 / f6 < 0.08\).

[0012] To select a suitable parameter range for the lens, preferably, \(-4.62 < f2 / R3 < -4.32\).

[0013] To select a suitable parameter range for the lens, preferably, \(1.13 < f3 / R6 < 1.24\).

[0014] Compared with the prior art, the present invention provides a hybrid glass-plastic lens for an action camera, having the following beneficial effects: 1. The hybrid glass-plastic lens for the action camera, through the use of a hybrid six-lens design composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a diaphragm, and in combination with the optimal range of the surface shape structure and optical parameters of each lens, can achieve high resolution, low distortion, and good color reproduction. It not only reduces the weight of the lens to achieve lightweight, but also can reduce costs and improve the adaptability of the lens in high-temperature and humid environments.

[0015] Parts not involved in this device are the same as those in the prior art or can be implemented using the prior art. The present invention solves the problem that the existing action camera lens is difficult to meet the requirements for high imaging quality, lightweight, and adaptability to high-temperature and humid environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic plan view of a hybrid glass-plastic lens for an action camera proposed by the present invention; Figure 2 It is the distortion of a hybrid glass-plastic lens for an action camera proposed by the present invention Figure 1 ; Figure 3 It is the axial chromatic aberration curve of a hybrid glass-plastic lens for an action camera proposed by the present invention Figure 1 ; Figure 4 It is the distortion of a hybrid glass-plastic lens for an action camera proposed by the present invention Figure 2 ; Figure 5Axial chromatic aberration curve of a hybrid glass-plastic lens for an action camera proposed by the present invention Figure 2 ; Figure 6 Distortion of a hybrid glass-plastic lens for an action camera proposed by the present invention Figure 3 ; Figure 7 Axial chromatic aberration curve of a hybrid glass-plastic lens for an action camera proposed by the present invention Figure 3 ; Figure 8 Distortion of a hybrid glass-plastic lens for an action camera proposed by the present invention Figure 4 ; Figure 9 Axial chromatic aberration curve of a hybrid glass-plastic lens for an action camera proposed by the present invention Figure 4 .

[0017] In the figure: 1, the first lens; 2, the second lens; 3, the third lens; 4, the fourth lens; 5, the fifth lens; 6, the sixth lens; 7, the diaphragm. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 should not be construed as a limitation of the present invention.

[0020] Embodiment 1: Refer to Figure 1, an embodiment of the present invention provides a hybrid glass-plastic lens for a sports camera, including a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6. Both the object side and the image side of the fifth lens 5 are spherical surfaces, and both the object side and the image side of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the sixth lens 6 are aspherical surfaces. It also includes a diaphragm 7 disposed between the second lens 2 and the third lens 3. The diaphragm 7 is used to control the amount of light passing through in the lens. Among them, the first lens 1, the fourth lens 4, and the sixth lens 6 all have negative refractive powers, and the second lens 2, the third lens 3, and the fifth lens 5 all have positive refractive powers. These positive and negative refractive powers will cause the incident light to spread outwards, expand the field of view angle, reduce distortion, and thus optimize the optical performance of the entire system. The object side of the first lens 1 is convex at the paraxial region, the object side of the fourth lens 4 is concave at the paraxial region, and the image side of the fourth lens 4 is also concave at the paraxial region. The object sides of the second lens 2 and the third lens 3 are both convex, and the image sides of the third lens 3 and the fifth lens 5 are both convex. 0.13 < f / R4 < 0.16, which can select the range of the overall focal length value of the lens group divided by the curvature radius of the image side of the second lens 2. 3.18 < V4 + V5 < 3.23, which can select the range of the sum of the dispersion coefficients of the fourth lens 4 and the fifth lens 5.

[0021] Specifically, when in use, by adopting a hybrid glass-plastic six-lens design composed of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the diaphragm 7, and combining with the optimal range of the surface shape structure and optical parameters of each lens, high resolution, low distortion, and good color reproduction can be achieved. It not only reduces the weight of the lens to achieve lightweight, but also can reduce costs and improve the adaptability of the lens in high-temperature and humid environments.

[0022] 0.31 < (R2 + R3) / (R2 - R3) < 0.38.

[0023] Specifically, through the parameter interval, the range of the sum of the curvature radius of the object side of the second lens 2 and the curvature radius of the image side of the third lens 3 divided by the curvature radius of the object side of the second lens 2 minus the curvature radius of the image side of the third lens 3 can be selected.

[0024] -7.30 < f6 / R6 < -6.29.

[0025] Specifically, through the parameter interval, the range of the focal length of the sixth lens 6 divided by the curvature radius of the object side of the sixth lens 6 can be selected.

[0026] 0.73 < ct1 / ct2 < 0.76.

[0027] Specifically, through the parameter interval, the range of the central thickness of the first lens 1 divided by the central thickness of the second lens 2 can be selected.

[0028] 3.62 < TL / f < 3.97.

[0029] Specifically, through the parameter range, the range of the distance from the object-side vertex of the first lens 1 to the imaging surface divided by the overall focal length value of the lens group can be selected.

[0030] 2.81 < TL / Dg < 3.46.

[0031] Specifically, through the parameter range, the range of the distance from the object-side vertex of the first lens 1 to the imaging surface divided by the diagonal length of the image formed by the maximum usable viewing angle of the lens group on the image surface can be selected.

[0032] 0.05 < f45 / f6 < 0.08.

[0033] Specifically, through the parameter range, the range of the focal length of the combination of the fourth lens 4 and the fifth lens 5 divided by the focal length of the sixth lens 6 can be selected.

[0034] -4.62 < f2 / R3 < -4.32.

[0035] Specifically, through the parameter range, the range of the focal length of the second lens 2 divided by the curvature radius of the image-side surface of the third lens 3 can be selected.

[0036] 1.13 < f3 / R6 < 1.24.

[0037] Specifically, through the parameter range, the range of the focal length of the third lens 3 divided by the curvature radius of the object-side surface of the sixth lens 6 can be selected.

[0038] The meanings represented by the "alphabetical numerical values" in the present invention are as follows: f: The overall focal length value of the lens group; R4: The curvature radius of the image-side surface of the second lens 2; V4: The dispersion coefficient of the fourth lens 4; V5: The dispersion coefficient of the fifth lens 5; R2: The curvature radius of the object-side surface of the second lens 2; R3: The curvature radius of the image-side surface of the third lens 3; f6: The focal length of the sixth lens 6; R6: The curvature radius of the object-side surface of the sixth lens 6; CT1: The central thickness of the first lens 1; CT2: The central thickness of the second lens 2; TL: The distance from the object-side vertex of the first lens 1 to the imaging surface; Dg: The diagonal length of the image formed by the maximum usable viewing angle of the lens group on the image surface; f45: The focal length of the combination of the fourth lens 4 and the fifth lens 5; f2: Focal length of the second lens 2; f3: Focal length of the third lens 3.

[0039] Example 2: Based on Example 1, the specific parameter selections are f = 1.48 mm, Fno = 2.19, FOV = 134°, and the aspherical coefficients to obtain the following table: Specifically, from the data in the above table, it is possible to generate Figure 2 and Figure 3 .

[0040] Example 3: Based on Example 1, the specific parameter selections are f = 1.46 mm, Fno = 2.18, FOV = 134°, and the aspherical coefficients to obtain the following table: Specifically, from the data in the above table, it is possible to generate Figure 4 and Figure 5 .

[0041] Example 4: Based on Example 1, the specific parameter selections are f = 1.44 mm, Fno = 2.18, FOV = 134°, and the aspherical coefficients to obtain the following table: Specifically, from the data in the above table, it is possible to generate Figure 6 and Figure 7 .

[0042] Example 5: Based on Example 1, the specific parameter selections are f = 1.43 mm, Fno = 2.18, FOV = 134°, and the aspherical coefficients to obtain the following table: Specifically, from the data in the above table, it is possible to generate Figure 8 and Figure 9 .

[0043] In the above table: f represents the focal length, Fno represents the f-number, and FOV represents the field of view. These three parameters act together in the design of a hybrid plastic and glass lens for an action camera to ensure that the lens has the characteristics of high imaging quality, light weight, and adaptability to high-temperature and humid environments.

[0044] The present invention is through Figure 2 , Figure 4 , Figure 6 , Figure 8 By comparing the changes in the distortion curves in it is concluded that: the performance of the lens at different focal lengths, the magnitude of the deformation of the object after imaging through the lens, and the closer the distortion curve is to 0, the closer the shape of the image is to the shape of the object; And, by Figure 3 , Figure 5 , Figure 7 , Figure 9 By comparing the changes in the axial chromatic aberration curves in it is concluded 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.

[0045] This optical short-focus under-screen fingerprint recognition lens, by adopting a hybrid plastic and glass six-lens design composed of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a diaphragm 7, and combining the surface shape structure and the optimal range of optical parameters of each lens, can achieve high resolution, low distortion, and good color reproduction, not only reducing the weight of the lens to achieve light weight, but also reducing costs and improving the adaptability of the lens to high-temperature and humid environments.

[0046] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A glass-plastic hybrid lens for a sports camera, comprising a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5) and a sixth lens (6), characterized in that: The object side surface and the image side surface of the fifth lens (5) are both spherical surfaces, the object side surface and the image side surface of the first lens (1), the second lens (2), the third lens (3), the fourth lens (4) and the sixth lens (6) are all aspherical surfaces, and further comprises an aperture stop (7) arranged between the second lens (2) and the third lens (3). The first lens (1), the fourth lens (4) and the sixth lens (6) all have negative refractive power, the second lens (2), the third lens (3) and the fifth lens (5) all have positive refractive power, the object side surface of the first lens (1) is convex at the paraxial position, the object side surface and the image side surface of the fourth lens (4) are both concave at the paraxial position, the object side surfaces of the second lens (2) and the third lens (3) are both convex, the image side surfaces of the third lens (3) and the fifth lens (5) are both convex, 0.13<f / R4<0.16, and 3.18<V4+V5<3.

23.

2. The glass-plastic hybrid lens for a sports camera according to claim 1, characterized in that: The 0.31<(R2+R3) / (R2-R3)<0.

38.

3. The glass-plastic hybrid lens for a sports camera according to claim 1, characterized in that: -7.30 <f6 / R6<-6.29。 4. The glass-plastic hybrid lens for a sports camera according to claim 1, characterized in that: 0.73 <ct1 / ct2<0.76。 5. The glass-plastic hybrid lens for a sports camera according to claim 1, characterized in that: 3.62 <TL / f<3.97。 6. The glass-plastic hybrid lens for a sports camera according to claim 1, characterized in that: 2.81 <TL / Dg<3.46。 7. The glass-plastic hybrid lens for a sports camera according to claim 1, characterized in that: 0.05 <f45 / f6<0.08。 8. The glass-plastic hybrid lens for a sports camera according to claim 1, characterized in that: -4.62 <f2 / R3<-4.32。 9. The glass-plastic hybrid lens for a sports camera according to claim 1, characterized in that: 1.13 <f3 / R6<1.24。

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