A zoom lens that changes the shape of the lens

Abstract

The present invention relates to the field of optical imaging technology, and in particular to a zoom lens that changes the shape of a lens. It includes a first lens group, a second lens group, a stop, a third lens group, and a fourth lens group that are arranged in sequence from the object side to the image side along the optical axis; the first lens group includes a first lens and a second lens, the second lens group includes a third lens, the third lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens, and the fourth lens group includes a tenth lens; wherein the object side surface of the first lens is a convex surface, the object side surface of the fourth lens is a convex surface, the third lens is a zoom lens whose object side surface changes the surface shape according to a specific focal length requirement, the sixth lens has a positive refractive power, the ninth lens has a positive refractive power, and the tenth lens is a focusing lens whose object side surface changes the surface shape according to a specific focal length requirement. The present invention can change the shooting range by adjusting the focal length without changing the distance, thereby improving the shooting type of the lens.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging, and in particular to a zoom lens capable of changing the shape of a lens. Background Art

[0002] With the rapid development of mobile devices such as mobile phones, they have become an indispensable part of people's lives. People are paying more and more attention to the lenses in mobile devices such as mobile phones, and their performance requirements are getting higher and higher. Most of the previous lenses were fixed-focus lenses, and the lens shooting range was fixed and could not achieve multi-functional shooting. Existing zoom lenses all achieve zoom shooting by moving the lens group. The zoom method has high requirements for motors, high moving precision, large size, and slow response speed. Summary of the invention

[0003] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a zoom lens capable of changing the shape of lenses, which can achieve the function of changing the spacing between lenses in the optical system by changing the shape of lenses in the optical system.

[0004] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0005] The present invention provides a zoom lens capable of changing the shape of a lens, comprising a first lens group, a second lens group, a third lens group and a fourth lens group arranged in sequence from the object side to the image side along an optical axis; an aperture is arranged between the second lens group and the third lens group; the first lens group comprises a first lens and a second lens, the second lens group comprises a third lens, the third lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, and the fourth lens group comprises a tenth lens; wherein the object side surface of the first lens is a convex surface, the object side surface of the fourth lens is a convex surface, the third lens is a zoom lens whose object side surface changes its surface shape according to a specific focal length requirement, the sixth lens has a positive refractive power, the ninth lens has a positive refractive power, and the tenth lens is a focusing lens whose object side surface changes its surface shape according to a specific focal length requirement; the zoom lens satisfies the following relationship:

[0006] 3≥Ft / Fw≥2

[0007] Wherein, Ft is the focal length of the zoom lens at telephoto, and Fw is the focal length of the zoom lens at wide angle. After satisfying the above formula, the zoom lens can achieve 2 to 3 times optical zoom.

[0008] Furthermore, the zoom lens also satisfies the following relationship:

[0009] (F2W+F2T) / (R5W+R5T)>-18

[0010] Among them, F2W is the focal length of the second lens group at wide angle; F2T is the focal length of the second lens group at telephoto; R5W is the R value of the object side of the second lens group at wide angle; R5T is the R value of the object side of the second lens group at telephoto. After satisfying the above formulas, the zoom lens can achieve the change of the focal length of the optical system by changing the change of the lens surface.

[0011] Furthermore, the zoom lens also satisfies the following relationship:

[0012] 0 <F6 / F9<4.5

[0013] Wherein, F6 is the effective focal length of the sixth lens, and F9 is the effective focal length of the ninth lens. After satisfying the formula, the effect of optical system distortion can be improved.

[0014] Furthermore, the zoom lens also satisfies the following relationship:

[0015] -18<(R1+R8) / (R1-R8)<4

[0016] Wherein, R1 is the curvature radius of the object side surface of the first lens, and R8 is the curvature radius of the object side surface of the fourth lens. After satisfying the above formula, the resolving power of the optical system can be effectively improved.

[0017] Furthermore, the zoom lens also satisfies the following relationship:

[0018] 3>R1 / F1>-1

[0019] Wherein, R1 is the radius of curvature of the object side of the first lens, and F1 is the effective focal length of the first lens. After satisfying the above formula, the illumination effect of the optical system can be effectively improved.

[0020] Furthermore, the zoom lens also satisfies the following relationship:

[0021] -30 <F2W / F4W<80

[0022] 1 <F2T / F4T<11

[0023] Among them, F2W is the effective focal length of the second lens group in wide-angle state, F4W is the effective focal length of the fourth lens group in wide-angle state, F2T is the effective focal length of the second lens group in telephoto state; F4T is the effective focal length of the fourth lens group in telephoto state. After satisfying the above formula, the zoom efficiency of the optical system can be effectively improved.

[0024] Furthermore, the surface shapes of all lenses in the first lens group, the second lens group, the third lens group and the fourth lens group satisfy the spherical surface formula or the aspherical surface formula, wherein the aspherical surface coefficient satisfies the following equation:

[0025] Z=cy 2 / [1+{1-(1+k)c 2 y 2} 1 / 2 ]+A4y 4 +A6y 6 +A8y 8 +A10y 10 +A12y 12 +

[0026] A14y 14

[0027] Among them, Z is the aspheric surface sag height, c is the aspheric surface paraxial curvature, y is the lens diameter, k is the cone coefficient, A4 is the 4th aspheric surface coefficient, A6 is the 6th aspheric surface coefficient, A8 is the 8th aspheric surface coefficient, A10 is the 10th aspheric surface coefficient, A12 is the 12th aspheric surface coefficient, and A14 is the 14th aspheric surface coefficient. Meeting the above expression can achieve the ability to correct aberrations that the previous spherical surface could not achieve, and improve the shooting effect of the lens.

[0028] The beneficial effects of the present invention are as follows: the zoom lens of the present invention can change the shooting range by adjusting the focal length without changing the distance between lenses, thereby improving the shooting type of the lens, and can realize the shooting of distant scenes while satisfying the shooting of nearby scenes, and can effectively improve the shooting clarity of the zoom lens, and realize a more uniform distribution of brightness when shooting pictures.

[0029] The present invention adopts a combination of ten lenses, allocates different lenses to different lens groups, and reasonably allocates the optical focal length and surface shape of each lens, so that the zoom lens has a continuous zoom function and can produce high-quality images at different focal lengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a zoom lens according to Embodiment 1 of the present application is shown;

[0031] Figure 2A , Figure 2B The distortion curves of the zoom lens of Example 1 in the telephoto state and the wide-angle state are shown respectively;

[0032] Figure 2C The illumination curves of the zoom lens of Example 1 in the telephoto state and the wide-angle state are shown;

[0033] Figure 2D , Figure 2E The MTF curves of the zoom lens of Example 1 in the telephoto state and the wide-angle state are shown respectively;

[0034] Figure 3 A schematic structural diagram of a zoom lens according to Embodiment 2 of the present application is shown;

[0035] Figure 4A , Figure 4B The distortion curves of the zoom lens of Example 2 in the telephoto state and the wide-angle state are shown respectively;

[0036] Figure 4C The illumination curves of the zoom lens of Example 2 in the telephoto state and the wide-angle state are shown;

[0037] Figure 4D , Figure 4E The MTF curves of the zoom lens of Example 2 in the telephoto state and the wide-angle state are shown respectively;

[0038] Figure 5 A schematic structural diagram of a zoom lens according to Embodiment 3 of the present application is shown;

[0039] Fig. 6A , Figure 6B The distortion curves of the zoom lens of Example 3 in the telephoto state and the wide-angle state are shown respectively;

[0040] Figure 6C shows the illumination curves of the zoom lens of Example 3 in the telephoto state and the wide-angle state;

[0041] Fig.6D , Fig. 6E The MTF curves of the zoom lens of Example 3 in the telephoto state and the wide-angle state are shown respectively;

[0042] Among them, the horizontal axis of the distortion curve is distortion (the value is %), and the vertical axis is the image height field; the horizontal axis of the illumination curve is the image height field, and the vertical axis is illumination; the horizontal axis of the MTF curve is the field of view, and the vertical axis is the MTF value.

[0043] In the figure: 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, sixth lens; 7, seventh lens; 8, eighth lens; 9, ninth lens; 10, tenth lens; 11, aperture. DETAILED DESCRIPTION

[0044] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0045] Example 1

[0046] The following reference Figure 1 It is a 2D diagram of the optical lens provided according to Example 1 of the present application.

[0047] like Figure 1As shown, the lenses of the zoom lens are distributed in sequence along the optical axis: a first lens 1 with positive refractive power; a second lens 2 with negative refractive power; a third lens 3 with variable refractive power; an aperture 11; a fourth lens 4 with negative refractive power; a fifth lens 5 with positive refractive power; a sixth lens 6 with positive refractive power; a seventh lens 7 with positive refractive power; an eighth lens 8 with negative refractive power; a ninth lens 9 with positive refractive power; and a tenth lens 10 with variable refractive power. Among them, the object side of the third lens 3 is a zoom lens whose surface shape can be changed according to the specific focal length requirements, and the third lens 3 is composed of a liquid lens and a glass lens. The tenth lens 10 is a focusing lens that can change the shape of the object side of the lens.

[0048] Table 1 (a) shows the surface type, curvature radius, thickness and material of each lens of the zoom lens of Example 1. The units of the curvature radius and thickness are both millimeters (mm).

[0049] Please refer to the following table for the specific design parameters of the lens assembly of this embodiment:

[0050] Table 1(a)

[0051]

[0052]

[0053] Table 1(b)

[0054] Face number K A4 A6 A8 A10 A12 A14 R1 -2.80E+00 -2.07E-05 2.21E-06 -2.14E-07 0.00E+00 0.00E+00 0.00E+00 R2 -1.34E+00 2.51E-05 -2.82E-07 5.69E-08 0.00E+00 0.00E+00 0.00E+00 R3 -9.55E-03 7.52E-07 1.06E-05 2.56E-06 4.32E-08 5.90E-08 0.00E+00 R4 -3.08E-01 3.24E-06 -5.97E-06 -4.55E-06 -2.49E-07 1.17E-07 0.00E+00 R5 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 R6 4.12E+00 -6.68E-04 -1.12E-03 -7.29E-04 0.00E+00 0.00E+00 0.00E+00 R7 5.27E+00 -5.35E-05 -7.34E-05 -1.06E-04 2.00E-06 0.00E+00 0.00E+00 R8 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 R9 -5.93E-01 -1.36E-05 4.22E-05 3.48E-05 2.22E-05 1.47E-11 0.00E+00 S10 -5.25E-03 -2.03E-05 -3.19E-06 1.15E-04 8.24E-05 2.97E-11 -1.02E-12 R11 9.84E-01 -9.38E-05 8.32E-05 2.46E-05 9.88E-06 7.13E-06 0.00E+00 R12 1.37E-02 -4.80E-06 -4.03E-05 -1.10E-05 -5.69E-06 0.00E+00 0.00E+00 R13 6.22E+01 -5.13E-05 1.09E-05 1.43E-06 -2.87E-06 0.00E+00 0.00E+00 R14 3.64E-01 -2.83E-05 1.24E-05 3.11E-06 2.52E-06 0.00E+00 0.00E+00 R15 -1.09E+00 2.86E-05 -1.97E-05 -3.93E-06 -2.76E-06 0.00E+00 0.00E+00 R16 9.87E-02 -1.13E-04 2.78E-05 3.36E-06 6.46E-07 0.00E+00 0.00E+00 R17 -1.93E-02 1.33E-04 -3.20E-05 -3.96E-06 0.00E+00 0.00E+00 0.00E+00 R18 -4.58E+00 -3.93E-05 1.59E-06 9.25E-07 0.00E+00 0.00E+00 0.00E+00 R19 -1.47E+00 6.67E-06 7.84E-07 1.19E-07 0.00E+00 0.00E+00 0.00E+00 R20 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 R21 -7.29E-03 2.64E-06 -2.34E-07 3.20E-08 0.00E+00 0.00E+00 0.00E+00 R22 5.64E-01 -2.03E-05 -2.02E-06 -1.94E-08 0.00E+00 0.00E+00 0.00E+00

[0055] In this embodiment, specific parameters of the zoom lens are shown in the following table:

[0056] Table 1(c)

[0057]

[0058] According to Table 1(a), Table 1(b) and Figure 1 The structural characteristics and material characteristics of the zoom lens shown in the embodiment have a small size, and the light can be focused on the image plane.

[0059] According to the values ​​in Table 1(c), Figure 2A and Figure 2B The distortion curve clearly shows that the zoom lens can effectively improve the influence of distortion during zooming and achieve clear shooting effects.

[0060] According to the values ​​in Table 1(c), Figure 2C The medium illumination curve clearly shows that the zoom lens can meet the requirement of uniform illumination distribution during zooming, improve illumination, and make the overall brightness of the picture uniform.

[0061] According to the values ​​in Table 1(c), and Figure 2D and Figure 2E The 42lp / mm and 84lp / mm MTF curves clearly show that the image of the zoom lens is clear during the zooming process.

[0062] Based on the above information, this zoom lens has the characteristics of small size, uniform brightness, and clear shooting.

[0063] Example 2

[0064] The following reference Figure 3 This is a 2D diagram of an optical lens according to Example 2 of the present application.

[0065] like Figure 3 As shown, the lenses of the zoom lens are distributed in sequence along the optical axis: a first lens with negative refractive power; a second lens with positive refractive power; a third lens with variable refractive power; an aperture; a fourth lens with positive refractive power; a fifth lens with negative refractive power; a sixth lens with positive refractive power; a seventh lens with negative refractive power; an eighth lens with positive refractive power; a ninth lens with positive refractive power; and a tenth lens with variable refractive power.

[0066] Table 2 (a) shows the surface type, curvature radius, thickness and material of each lens of the zoom lens of Example 2. The units of the curvature radius and thickness are both millimeters (mm).

[0067] Please refer to the following table for the specific design parameters of the lens assembly of this embodiment:

[0068] Table 2(a)

[0069]

[0070]

[0071] In this embodiment, specific parameters of the zoom lens are shown in the following table:

[0072] Table 2(b)

[0073]

[0074] According to Table 2(a) and Figure 3 The structural characteristics and material characteristics of the zoom lens shown in Example 2 are relatively small in size, and light can be focused on the image plane.

[0075] According to the values ​​in Table 2(b), Figure 4A and Figure 4BThe distortion curve clearly shows that the zoom lens can effectively improve the influence of distortion during zooming and achieve clear shooting effects.

[0076] According to the values ​​in Table 2(b), Figure 4C The medium illumination curve clearly shows that the zoom lens can meet the requirement of uniform illumination distribution during zooming, improve illumination, and make the overall brightness of the picture uniform.

[0077] According to the values ​​in Table 2(c), Figure 4D and Figure 4E The 110lp / mm and 220lp / mm MTF curves clearly show that the image of the zoom lens is clear during the zooming process.

[0078] According to the above information, this zoom lens has the characteristics of small size, clear shooting and uniform brightness.

[0079] Example 3

[0080] The following reference Figure 5 This is a 2D diagram of an optical lens according to Example 3 of the present application.

[0081] like Figure 5 As shown, the lenses of the zoom lens are distributed in sequence along the optical axis: a first lens with negative refractive power; a second lens with positive refractive power; a third lens with variable refractive power; an aperture; a fourth lens with positive refractive power; a fifth lens with negative refractive power; a sixth lens with positive refractive power; a seventh lens with negative refractive power; an eighth lens with positive refractive power; a ninth lens with positive refractive power; and a tenth lens with variable refractive power.

[0082] Table 3 (a) shows the surface type, curvature radius, thickness and material of each lens of the zoom lens of Example 3. The units of the curvature radius and thickness are both millimeters (mm).

[0083] Please refer to the following table for the specific design parameters of the lens assembly of this embodiment:

[0084] Table 3(a)

[0085]

[0086]

[0087] In this embodiment, specific parameters of the zoom lens are shown in the following table:

[0088] Table 3(b)

[0089]

[0090] According to Table 3(a) and Figure 5 The structural characteristics and material characteristics of the zoom lens shown in Example 3 are relatively small in size, and light can be focused on the image plane.

[0091] According to the values ​​in Table 3(b), Fig. 6A and Figure 6B The distortion curve clearly shows that the zoom lens can effectively improve the influence of distortion during zooming and achieve clear shooting effects.

[0092] According to the values ​​in Table 3(b), Figure 6C The medium illumination curve clearly shows that the zoom lens can meet the requirement of uniform illumination distribution during zooming, improve illumination, and make the overall brightness of the picture uniform.

[0093] According to the values ​​in Table 3(b), Fig.6D and Fig. 6E The MTF curves at 110lp / mm and 220lp / mm clearly show that the image of the zoom lens is clear during the zooming process.

[0094] Based on the above information, this zoom lens has the characteristics of small size, uniform brightness, and clear shooting.

Claims

1. A zoom lens with a variable lens shape, characterized in that: The zoom lens is composed of a first lens group, a second lens group, a third lens group and a fourth lens group which are arranged in sequence from the object side to the image side along the optical axis; the first lens group is composed of a first lens and a second lens, the second lens group is composed of a third lens, the third lens group is composed of a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, and the fourth lens group is composed of a tenth lens; The first lens has a convex object side surface, the fourth lens has a convex object side surface, the third lens is a zoom lens whose object side surface changes according to a specific focal length requirement, the sixth lens has a positive refractive power, the ninth lens has a positive refractive power, and the tenth lens is a focus lens whose object side surface changes according to a specific focal length requirement; the zoom lens satisfies the following relationship: 3≥Ft / Fw≥2 -18<(F2W+F2T) / (R5W+R5T) ≤-4.4 Among them, Ft is the focal length of the zoom lens at telephoto, Fw is the focal length of the zoom lens at wide angle, F2W is the focal length of the second lens group at wide angle, and F2T is the focal length of the second lens group at telephoto; R5W is the R value of the object side of the second lens group at wide angle, and R5T is the R value of the object side of the second lens group at telephoto.

2. The zoom lens with a variable lens shape according to claim 1, characterized in that: The zoom lens also satisfies the following relationship: 1.8≤F6 / F9<4.5 Among them, F6 is the effective focal length of the sixth lens, and F9 is the effective focal length of the ninth lens.

3. The zoom lens with a variable lens shape according to claim 1, characterized in that: The zoom lens also satisfies the following relationship: -18<(R1+R8) / (R1-R8)<4 Wherein, R1 is the curvature radius of the object side surface of the first lens, and R8 is the curvature radius of the object side surface of the fourth lens.

4. The zoom lens with a variable lens shape according to claim 1, characterized in that: The zoom lens also satisfies the following relationship: -0.4≤R1 / F1≤2.04 Wherein, R1 is the radius of curvature of the object side surface of the first lens, and F1 is the effective focal length of the first lens.

5. The zoom lens with a variable lens shape according to claim 1, characterized in that: The zoom lens also satisfies the following relationship: -30 <F2W / F4W<80 1 <F2T / F4T<11 Among them, F2W is the effective focal length of the second lens group in wide-angle state, and F4W is the effective focal length of the fourth lens group in wide-angle state. F2T is the effective focal length of the second lens group in telephoto state; F4T is the effective focal length of the fourth lens group in telephoto state.

6. The zoom lens with a variable lens shape according to claim 1, characterized in that: The lenses in the first lens group, the second lens group, the third lens group and the fourth lens group all satisfy the spherical formula or the aspherical formula, wherein the aspherical coefficient satisfies the following equation: Z=cy 2 / [1+{1-(1+k)c 2 y 2 } 1 / 2 ]+A4y 4 +A6y 6 +A8y 8 +A10y 10 +A12y 12 +A14y 14 Among them, Z is the aspheric surface sag, c is the aspheric surface paraxial curvature, y is the lens aperture, k is the cone coefficient, A4 is the fourth-order aspheric Surface coefficient, A6 is the 6th aspheric coefficient, A8 is the 8th aspheric coefficient, A10 is the 10th aspheric coefficient, A12 is the 12th aspheric coefficient, and A14 is the 14th aspheric coefficient.

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