A medium telephoto and macro optical system and an electronic device

Abstract

The present invention discloses a medium-long focal length and macro optical system and an electronic device, which can realize shooting functions covering long focal length and macro, so as to meet the shooting requirements of almost all scenarios and effectively reduce the number of cameras required for the electronic device. The medium-long focal length and macro optical system in the present invention includes a first lens, a second lens and an image sensor arranged in sequence along the light incident direction; the second lens is connected with a driving member and the second lens can be driven to displace between the first lens and the image sensor to approach or move away from the first lens; wherein, the focal length f7 of the first lens satisfies: 3.2 mm ≤ f7 ≤ 4 mm; the focal length f8 of the second lens satisfies: -3.2 mm ≤ f8 ≤ -2.2 mm.

Description

Technical Field

[0001] The present invention relates to the technical field of optical system design, and particularly to a medium-long focal length and macro optical system and an electronic device. Background Art

[0002] The shooting function has become a basic function of most electronic devices (such as smartphones, tablets, etc.). With the popularization of the shooting function in electronic devices, users' requirements for the shooting quality of electronic devices are also getting higher and higher. For electronic devices, different cameras are required in different shooting scenarios. For example, different cameras are required in scenarios such as long focal length shooting and macro shooting. To implement the above shooting functions, this also leads to a large number of cameras in the electronic device, which is not conducive to the thinning of the electronic device and increases the production cost of the manufacturer.

[0003] Therefore, finding a technical solution that can solve the above technical problems has become an important research topic for those skilled in the art. Summary of the Invention

[0004] Embodiments of the present invention disclose a medium-long focal length and macro optical system and an electronic device to solve the above technical problems.

[0005] A medium-long focal length and macro optical system provided by the present invention includes a first lens, a second lens, and an image sensor arranged in sequence along the light incident direction;

[0006] The second lens is connected with a driving member and the second lens can be driven to displace between the first lens and the image sensor to approach or move away from the first lens;

[0007] Wherein, the focal length f7 of the first lens satisfies: 3.2 mm ≤ f7 ≤ 4 mm; the focal length f8 of the second lens satisfies: -3.2 mm ≤ f8 ≤ -2.2 mm.

[0008] Optionally, the equivalent focal length of the medium-long focal length and macro optical system is 50 mm to 60 mm, the field of view angle of the medium-long focal length and macro optical system is 35° to 45°, and the range of the target surface size of the image sensor is 1 / 4" to 1 / 3.06".

[0009] Optionally, the central thickness T1 of the first lens satisfies 2.3 mm ≤ T1 ≤ 2.7 mm; the central thickness T2 of the second lens satisfies 2.6 mm ≤ T2 ≤ 3.6 mm; the air gap T3 between the first lens and the second lens satisfies T3 > 0.24 mm.

[0010] Optionally, the first lens includes a first lens barrel, a first lens, a second lens, a third lens, and at least one first aperture;

[0011] Among them, the first lens, the first diaphragm, the second lens, and the third lens are arranged in sequence along the light incident direction inside the first lens barrel.

[0012] Optionally, the first lens is made of a resin material with a refractive index of 1.52 < Nd1 < 1.56 and a dispersion coefficient of 52 < Vd1 < 58;

[0013] The second lens is made of a resin material with a refractive index of 1.62 < Nd2 < 1.68 and a dispersion coefficient of 22 < Vd2 < 28;

[0014] The third lens is made of a resin material with a refractive index of 1.52 < Nd3 < 1.55 and a dispersion coefficient of 53 < Vd3 < 59.

[0015] Optionally, the second lens unit includes a second lens barrel, a fourth lens, a fifth lens, a sixth lens, and at least one second diaphragm;

[0016] Among them, the fourth lens, the fifth lens, the second diaphragm, and the sixth lens are arranged in sequence along the light incident direction inside the second lens barrel.

[0017] Optionally, the fourth lens is made of a resin material with a refractive index of 1.52 < Nd4 < 1.55 and a dispersion coefficient of 53 < Vd4 < 59;

[0018] The fifth lens is made of a resin material with a refractive index of 1.62 < Nd5 < 1.68 and a dispersion coefficient of 22 < Vd5 < 28;

[0019] The sixth lens is made of a resin material with a refractive index of 1.52 < Nd1 < 1.56 and a dispersion coefficient of 52 < Vd1 < 58.

[0020] Optionally, the surface profiles of the 12 surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all even aspheres, and the aspherical surface profiles satisfy the following formula:

[0021]

[0022] Where: Z is the sagitta of the aspherical surface at a position with a height of h along the optical axis direction, measured from the vertex of the aspherical surface;

[0023] C = 1 / r, r represents the radius of curvature of the lens surface, k is the conic coefficient, A is the 4th-order aspherical coefficient, B is the 6th-order aspherical coefficient, C is the 8th-order aspherical coefficient, D is the 10th-order aspherical coefficient, E is the 12th-order aspherical coefficient, F is the 14th-order aspherical coefficient, and G is the 16th-order aspherical coefficient.

[0024] Optionally, a filter is further disposed between the second lens and the image sensor.

[0025] An embodiment of the present invention discloses an electronic device, including the above-mentioned medium telephoto and macro optical system.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] In the medium telephoto and macro optical system of the present invention, the second lens can be driven by the driving member to approach or move away from the first lens. In the above design, when telephoto shooting is required, the second lens can be driven to move in the direction of the first lens to approach the first lens; when close-up or macro shooting is required, the second lens can be driven to move in the direction away from the first lens to a suitable position. Through the above design, the medium telephoto and macro optical system can realize shooting functions covering telephoto and macro, so as to meet the shooting needs of almost all scenarios, effectively reduce the number of cameras required for the electronic device, and further reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 FIG. 18 is a schematic structural diagram of a medium telephoto and macro optical system provided by the present invention in a telephoto shooting state;

[0030] Figure 2 FIG. 22 is a schematic structural diagram of a medium telephoto and macro optical system provided by the present invention in a macro shooting state;

[0031] Figure 3 FIG. 26 is an optical path diagram of the medium telephoto and macro optical system in Embodiment 1 of the present invention in a telephoto shooting state;

[0032] Figure 4 FIG. 30 is an optical path diagram of the medium telephoto and macro optical system in Embodiment 1 of the present invention in a macro shooting state;

[0033] Figure 5 For Figure 3 MTF curve evaluation corresponding to the medium telephoto and macro optical system;

[0034] Figure 6 For Figure 4 MTF curve evaluation corresponding to the medium telephoto and macro optical system;

[0035] Figure 7For Figure 3 The defocus curve corresponding to the medium telephoto and macro optical system;

[0036] Figure 8 For Figure 4 The defocus curve corresponding to the medium telephoto and macro optical system;

[0037] Figure 9 For Figure 3 The distortion curve corresponding to the medium telephoto and macro optical system;

[0038] Figure 10 For Figure 4 The distortion curve corresponding to the medium telephoto and macro optical system;

[0039] Figure 11 The optical path diagram of the medium telephoto and macro optical system in the telephoto shooting state in the second embodiment of the present invention;

[0040] Figure 12 The optical path diagram of the medium telephoto and macro optical system in the macro shooting state in the second embodiment of the present invention;

[0041] Figure 13 For Figure 11 The MTF curve evaluation corresponding to the medium telephoto and macro optical system;

[0042] Figure 14 For Figure 12 The MTF curve evaluation corresponding to the medium telephoto and macro optical system;

[0043] Figure 15 For Figure 11 The defocus curve corresponding to the medium telephoto and macro optical system;

[0044] Figure 16 For Figure 12 The defocus curve corresponding to the medium telephoto and macro optical system;

[0045] Figure 17 For Figure 11 The distortion curve corresponding to the medium telephoto and macro optical system;

[0046] Figure 18 For Figure 12 The distortion curve corresponding to the medium telephoto and macro optical system;

[0047] Figure 19 The optical path diagram of the medium telephoto and macro optical system in the telephoto shooting state in the third embodiment of the present invention;

[0048] Figure 20 The optical path diagram of the medium telephoto and macro optical system in the macro shooting state in the third embodiment of the present invention;

[0049] Figure 21 For Figure 19 the MTF curve evaluation corresponding to the medium telephoto and macro optical system;

[0050] Figure 22 For Figure 20 the MTF curve evaluation corresponding to the medium telephoto and macro optical system;

[0051] Figure 23 For Figure 19 the defocus curve corresponding to the medium telephoto and macro optical system;

[0052] Figure 24 For Figure 20 the defocus curve corresponding to the medium telephoto and macro optical system;

[0053] Figure 25 For Figure 19 the distortion curve corresponding to the medium telephoto and macro optical system;

[0054] Figure 26 For Figure 20 the distortion curve corresponding to the medium telephoto and macro optical system;

[0055] Illustration: First lens 1; First lens element 11; Second lens element 12; Third lens element 13; Second lens 2; Fourth lens element 21; Fifth lens element 22; Sixth lens element 23; Filter 3; Image sensor 4. Detailed implementation manners

[0056] To enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0057] Please refer to Figures 1 to 2 , a medium telephoto and macro optical system provided by the present invention includes a first lens 1, a second lens 2, and an image sensor 4 arranged in sequence along the light incident direction;

[0058] The second lens 2 is connected with a driving member, and the second lens 2 can be driven to displace between the first lens 1 and the image sensor 4 to approach or move away from the first lens 1. Specifically, the driving member is a voice coil motor;

[0059] Among them, the focal length f7 of the first lens 1 satisfies: 3.2mm≤f7≤4mm; the focal length f8 of the second lens 2 satisfies: -3.2mm≤f8≤-2.2mm, specifically, f7 can be 3.2mm, 3.4mm, etc.; f8 can be -3.1mm, -3.0mm, etc.

[0060] It should be noted that the above range selection of focal length f7 and focal length f8 can ensure that the optical system of this embodiment shortens the total optical length under the conditions of a large field of view and a large amount of light input, thereby facilitating size reduction and meeting the trend of thinner and lighter electronic devices.

[0061] The second lens 2 of the medium-long focal length and macro optical system of the present invention can be driven by the driving member to move closer to or farther from the first lens 1. In the above design, when long focal length shooting is required, the second lens 2 can be driven to move in the direction of the first lens 1 to get closer to the first lens 1; when close-up or macro shooting is required, the second lens 2 can be driven to move to a suitable position away from the first lens 1. Through the above design, the long focal length and macro optical system can achieve shooting functions covering long focal length and macro, thereby meeting the shooting needs of almost all scenes, effectively reducing the number of cameras required for electronic devices, and thus reducing production costs.

[0062] In addition, in the prior art, macro photography is mostly done by using a wide-angle camera to perform AF autofocus while taking into account the macro. This method of macro photography has the following disadvantages:

[0063] 1. The wide-angle macro has a low magnification ratio; 2. The wide-angle macro lens has a relatively low resolution, and only the central field of view can be clearly focused, and there is almost no resolution capability beyond 0.3F; 3. Wide-angle macro requires shooting at an extreme focusing distance, which is very easy to block light and produce shadows. The medium-long focal length and macro optical system in this embodiment has a large magnification ratio and can capture distant details. It has excellent long-focus shooting function and also solves the problems of light blocking of the subject when shooting close-up and edge distortion of the wide-angle lens.

[0064] Furthermore, the equivalent focal length of the medium-long focal length and macro optical system in the present invention is 50mm to 60mm, the field of view angle of the medium-long focal length and macro optical system is 35° to 45°, for example, it can be 40°, 36°, etc., and the target surface size of the image sensor 4 ranges from 1 / 4" to 1 / 3.06".

[0065] Furthermore, in order to meet the shooting functions of telephoto and macro, the center thickness T1 of the first lens 1 in the present invention satisfies 2.3mm≤T1≤2.7mm; the center thickness T2 of the second lens 2 satisfies 2.6mm≤T2≤3.6mm;

[0066] Specifically, T1 can be 2.3 mm, 2.4 mm, 2.5 mm, etc., and T2 can be 3.0 mm, 3.1 mm, 3.5 mm, etc.

[0067] In addition, the air gap T3 between the first lens 1 and the second lens 2 satisfies T3 > 0.24 mm, so as to meet the disassembly of the endoscope barrel structure of the optical system;

[0068] Specifically, T3 can be 0.25 mm, 0.26 mm, etc.

[0069] Furthermore, the first lens 1 in the present invention specifically includes a first lens barrel, a first lens 11, a second lens 12, a third lens 13, and at least one first aperture stop;

[0070] Among them, the first lens 11, the first aperture stop, the second lens 12, and the third lens 13 are arranged in sequence along the light incident direction inside the first lens barrel.

[0071] It should be noted that the above-mentioned first aperture stop is specifically an aperture diaphragm.

[0072] Specifically, the first lens 11 in the present invention is made of a resin material with a refractive index of 1.52 < Nd1 < 1.56 and a dispersion coefficient of 52 < Vd1 < 58;

[0073] The second lens 12 is made of a resin material with a refractive index of 1.62 < Nd2 < 1.68 and a dispersion coefficient of 22 < Vd2 < 28;

[0074] The third lens 13 is made of a resin material with a refractive index of 1.52 < Nd3 < 1.55 and a dispersion coefficient of 53 < Vd3 < 59.

[0075] It should be noted that the above parameter ranges can ensure that in the long-focus and macro optical system of the present application, while ensuring a large field of view angle and a large light input amount, the overall optical length is shortened, which is beneficial to reducing the size, and at the same time, chromatic aberration can be corrected. In addition, using resin materials to manufacture the above lenses can reduce production costs.

[0076] Furthermore, the second lens 2 in the present invention includes a second lens barrel, a fourth lens 21, a fifth lens 22, a sixth lens 23, and at least one second aperture stop;

[0077] Among them, the fourth lens 21, the fifth lens 22, the second aperture stop, and the sixth lens 23 are arranged in sequence along the light incident direction inside the second lens barrel.

[0078] It should be noted that the second aperture stop in this embodiment is specifically a light-shielding aperture stop.

[0079] Specifically, the fourth lens 21 is made of a resin material with a refractive index of 1.52 < Nd4 < 1.55 and a dispersion coefficient of 53 < Vd4 < 59;

[0080] The fifth lens 22 is made of a resin material with a refractive index of 1.62 < Nd5 < 1.68 and a dispersion coefficient of 22 < Vd5 < 28;

[0081] The sixth lens 23 is made of a resin material with a refractive index of 1.52 < Nd1 < 1.56 and a dispersion coefficient of 52 < Vd1 < 58.

[0082] It should be noted that the above parameter ranges can ensure that in the long - focal - length and macro - shooting optical system of the present application, while ensuring a large field of view angle and a large light - input amount, the overall optical length is shortened, which is beneficial to reducing the size. At the same time, chromatic aberration can be corrected. In addition, manufacturing the above lenses with resin materials can reduce production costs.

[0083] Furthermore, the surface profiles of the 12 surfaces of the first lens 11, the second lens 12, the third lens 13, the fourth lens 21, the fifth lens 22, and the sixth lens 23 in the present invention are all even - order aspherical surfaces, and the aspherical surface profile satisfies the following formula:

[0084]

[0085] where: Z is the sagitta of the aspherical surface at a position with a height of h along the optical axis, which is the distance from the vertex of the aspherical surface;

[0086] C = 1 / r, where r represents the curvature radius of the lens surface, k is the conic coefficient, A is the 4th - order aspherical coefficient, B is the 6th - order aspherical coefficient, C is the 8th - order aspherical coefficient, D is the 10th - order aspherical coefficient, E is the 12th - order aspherical coefficient, F is the 14th - order aspherical coefficient, and G is the 16th - order aspherical coefficient.

[0087] Furthermore, a filter 33 is also provided between the second lens 2 and the image sensor 4.

[0088] It should be noted that the filter 33 in this embodiment is specifically a filter glass, and its main function is to control the color and intensity of light. The filter 33 can adjust the brightness of light, change the color of light, or filter out miscellaneous light by selectively transmitting or absorbing light within a specific frequency range, so that the image sensor 4 can obtain appropriate light.

[0089] Please refer to Figures 1 to 2 , an electronic device provided by the present invention includes the above - mentioned long - focal - length and macro - shooting optical system.

[0090] Among them, the electronic device can specifically be a smart phone, a tablet computer, a notebook computer, etc., and this embodiment does not limit this.

[0091] Furthermore, the electronic device in this embodiment may further include a wide-angle camera;

[0092] Among them, the equivalent focal length of the wide-angle camera is 20mm to 25mm, the field of view angle is 80° to 90°, and the range of the target surface size of the image sensor 4 is 1 / 3.06” to 1 / 2.78”;

[0093] It should be noted that through the above design, the electronic device in this embodiment has the following advantages by adopting the above solution:

[0094] 1. It can cover the shooting functions of wide-angle, telephoto, and macro, meet the shooting needs of almost all scenarios, reduce the number of cameras of the electronic device, and save production costs.

[0095] 2. The medium telephoto and macro optical system has excellent portrait shooting focal lengths and portrait shooting effects;

[0096] 3. The internal focusing realizes automatic focusing from infinity to macro. The height of the first lens 1 is fixed and does not change due to the change of the shooting object, and the second lens 2 has a small movement stroke;

[0097] 4. The medium telephoto and macro optical system has a large magnification ratio and can capture details a little farther away, solving problems such as the light of the shooting object being blocked during close shooting and the edge distortion of the wide-angle lens.

[0098] The following uses specific embodiments to illustrate the effects of the medium telephoto and macro optical system provided by the embodiments of the present application.

[0099] Embodiment 1

[0100] Please refer to Figures 3 to 10 , the medium telephoto and macro optical system in this embodiment includes a first lens 1, a second lens 2, a filter 33, and an image sensor 4;

[0101] The first lens 1 includes a first lens 11, an aperture stop, a second lens 12, and a third lens 13 group;

[0102] The second lens 2 includes a fourth lens 21, a fifth lens 22, a light-shielding stop, and a sixth lens 23;

[0103] The focal length f7 of the first lens 1 is 3.32mm;

[0104] The focal length f8 of the second lens 2 is -2.44mm.

[0105] The central thickness T1 of the first lens 1 is 2.58mm;

[0106] The central thickness T2 of the second lens 2 is 2.62mm;

[0107] The air gap between the two lenses at the object distance being photographed is 0.246 mm ≤ T3 ≤ 0.557 mm;

[0108] The first lens 11 is an aspherical lens with a positive optical power, the second lens 12 is an aspherical lens with a negative optical power, the third lens 13 is an aspherical lens with a positive optical power, the fourth lens 21 is an aspherical lens with a negative optical power, the fifth lens 22 is an aspherical lens with a positive optical power, and the sixth lens 23 is an aspherical lens with a negative optical power, all of which are made of resin;

[0109] The focal lengths of each lens are f1 = 4.28 mm, f2 = -7.06 mm, f3 = 4.05 mm, f4 = -8.53 mm, f5 = 43.418 mm, f6 = -3.83 mm.

[0110] The relevant parameters of each lens and the lens movement position spacing at each object distance are shown in Table 1 below:

[0111] Table 1

[0112]

[0113]

[0114] The aspherical coefficients are shown in Table 2 below:

[0115] Table 2

[0116] K A B C D E 1 -4.510 5.26E-03 -6.31E-03 -4.16E-04 -3.76E-04 2 22.715 -3.50E-02 -1.44E-03 5.93E-03 -1.53E-03 -4.80E-05 4 -22.021 -1.11E-02 -5.20E-03 8.09E-03 7.99E-04 -1.61E-03 5 47.193 1.03E-02 -1.39E-02 1.28E-03 1.98E-03 6 -46.674 -1.37E-02 -3.18E-02 -6.00E-03 -1.06E-03 7 6.058 -5.51E-04 6.09E-03 -1.13E-02 2.38E-03 7.65E-04 8 -64.035 3.05E-02 3.71E-03 6.93E-03 5.65E-04 9 97.002 3.52E-02 -4.68E-02 2.36E-02 -3.67E-03 -1.02E-03 10 31.919 -3.4OE-02 -4.62E-02 2.29E-03 -4.96E-03 2.37E-05 11 -70.187 -4.86E-02 -5.41E-03 -4.26E-03 2.50E-03 5.40E-05 12 5.142 -1.23E-01 2.82E-02 -4.44E-03 4.69E-04 13 -35.689 -7.29E-02 1.66E-02 -2.03E-03 -3.26E-05

[0117] The technical indicators of this embodiment are as follows:

[0118] 1. Equivalent focal length: 52 mm, system focal length: f = 5.47 mm @ inf; f = 4.52 mm @ Macro5cm;

[0119] 2. Macro magnification ratio: 0.11x; equivalent magnification ratio: 4.1x;

[0120] 3. Aperture number F#: 2.4 @ inf; 2.86 @ Macro5cm;

[0121] 4. Field of view angle 2θ: 45.8° @ inf; 45.4° @ Macro5cm;

[0122] 5. Optical back focus FBL: 0.97 mm @ inf; 0.66 mm @ Macro5cm;

[0123] 6. Optical total length TTL: 6.42 mm;

[0124] 7. Image height IMH > 4.8 mm, paired with 1 / 4” CMOS.

[0125] The imaging effect of this embodiment is as Figure 5 and Figure 6 evaluated by the MTF curve shown. The MTF curves under each field of view decline smoothly, indicating that the optical system has good imaging effects and resolution within the entire field of view from infinity to macro.

[0126] As Figure 7 and Figure 8 shown, the defocus curve at 110 lp / mm indicates that the optical system has good aberration control within the entire field of view from infinity to macro and has a relatively wide depth of focus.

[0127] As Figure 9 and Figure 10 shown by the full-field distortion curve of the optical system, the surface optical system has an actual optical distortion within 3% from infinity to macro.

[0128] Embodiment 2

[0129] Please refer to Figures 11 to 18 , the medium-telephoto and macro optical system in this embodiment includes a first lens 1, a second lens 2, a filter 33, and an image sensor 4;

[0130] The first lens 1 includes an aperture stop, a first lens 11, a second lens 12, and a third lens 13;

[0131] The second lens 2 includes a light-shielding stop, a fourth lens 21, a fifth lens 22, and a sixth lens 23;

[0132] The focal length f7 of the first lens 1 is 3.86 mm;

[0133] The focal length f8 of the second lens 2 is -3.04 mm ;

[0134] The central thickness T1 of the first lens 1 is 2.35 mm;

[0135] The central thickness T2 of the second lens 2 is 3.27 mm;

[0136] The air gap between the two lenses at the object distance being imaged is 0.375 mm ≤ T3 ≤ 0.649 mm;

[0137] The first lens 11 is an aspherical lens with positive optical power, the second lens 12 is an aspherical lens with negative optical power, the third lens 13 is an aspherical lens with positive optical power, the fourth lens 21 is an aspherical lens with negative optical power, the fifth lens 22 is an aspherical lens with negative optical power, and the sixth lens 23 is an aspherical lens with negative optical power, all of which are made of resin;

[0138] The focal lengths of its respective lenses are f1 = 4.70 mm, f2 = -6.72 mm, f3 = 4.51 mm, f4 = -12.77 mm, f5 = -41.62 mm, and f6 = -5.73 mm.

[0139] The relevant parameters of each lens and the lens movement position spacing at each object distance are shown in Table 3 below:

[0140] Table 3

[0141]

[0142]

[0143] The aspherical coefficients are shown in Table 4 below:

[0144] Table 4

[0145] K A B C D E 2 0.478 1.43E-03 -1.76E-02 9.23E-03 -3.36E-03 1.62E-05 3 99.001 1.52E-02 -1.69E-02 -2.99E-03 1.12E-03 -6.94E-05 4 -99.012 -1.76E-02 6.29E-03 -6.79E-03 2.14E-03 -8.99E-05 5 53.933 -7.03E-03 -1.42E-02 9.98E-03 -2.50E-03 4.7OE-05 6 -29.720 -2.51E-02 -1.41E-02 -2.81E-03 9.53E-04 -4.69E-05 7 1.693 -8.72E-03 -9.50E-03 -1.22E-04 3.04E-04 -4.38E-06 8 -18.637 6.78E-03 2.75E-03 5.83E-04 -6.11E-05 -2.80E-05 9 -99.012 2.37E-02 -1.74E-02 6.00E-03 -1.35E-03 4.52E-06 i0 94.970 -2.14E-02 -2.62E-02 3.95E-03 -6.29E-06 -3.88E-04 11 -67.191 -2.49E-02 -1.07E-02 3.64E-03 -3.96E-04 2.96E-05 12 97.341 -8.47E-02 2.32E-02 -3.17E-03 2.85E-04 -8.46E-06 13 -11.973 -4.82E-02 1.41E-02 -2.10E-03 1.27E-04 1.67E-07

[0146] The technical indicators of this embodiment are as follows:

[0147] 1. Equivalent focal length: 60 mm, system focal length: f = 6.35 mm @ inf; f = 5.5 mm @ Macro8cm;

[0148] 2. Macro magnification ratio: 0.073x, equivalent magnification ratio: 3.7x;

[0149] 3. Aperture number F#: 2.23 @ inf; 2.19 @ Macro8cm

[0150] 4. Field of view angle 2θ: 42.5° @ inf; 42° @ Macro8cm

[0151] 5. Optical back focus FBL: 1.01 mm @ inf; 0.74 mm @ Macro8cm

[0152] 6. Optical total length TTL: 7 mm

[0153] 7. Image height IMH > 4.8 mm with 1 / 4” CMOS

[0154] The imaging effect of this embodiment is evaluated by the MTF curves as shown in Figure 13 and Figure 14 The MTF curves at each field of view decline smoothly, indicating that the optical system has good imaging effects and resolution throughout the entire field of view from inf to Macro.

[0155] As shown in Figure 15 and Figure 16 The defocus curves at 110 l p / mm show that the optical system has good aberration control and a relatively wide depth of focus throughout the entire field of view from inf to Macro.

[0156] As Figure 17 and Figure 18 shown, for the full field distortion curve of the optical system, the optical distortion of the surface optical system is within 3% from infinity to macro.

[0157] Embodiment 3

[0158] Please refer to Figures 19 to 26 , the medium - long - focal - length and macro optical system in this embodiment includes a first lens 1, a second lens 2, a filter 33, and an image sensor 4;

[0159] The first lens 1 includes an aperture stop, a first lens 11, a second lens 12, and a third lens 13;

[0160] The second lens 2 includes a light - shielding stop, a fourth lens 21, a fifth lens 22, and a sixth lens 23;

[0161] The focal length f7 of the first lens 1 is 3.92 mm;

[0162] The focal length f8 of the second lens 2 is - 2.98 mm;

[0163] The central thickness T1 of the first lens 1 is 2.42 mm;

[0164] The central thickness T2 of the second lens 2 is 3.52 mm;

[0165] The air gap between the two lenses at the object distance is 0.357 mm ≤ T3 ≤ 0.605 mm;

[0166] The first lens 11 is an aspherical lens with a positive optical power, the second lens 12 is an aspherical lens with a negative optical power, the third lens 13 is an aspherical lens with a positive optical power, the fourth lens 21 is an aspherical lens with a negative optical power, the fifth lens 22 is an aspherical lens with a negative optical power, and the sixth lens 23 is an aspherical lens with a negative optical power, all of which are made of resin;

[0167] The focal lengths of each lens are f1 = 4.73 mm, f2 = - 7.54 mm, f3 = 4.89 mm, f4 = - 9.21 mm, f5 = - 116.59 mm, f6 = - 6.34 mm.

[0168] The relevant parameters of each lens and the lens movement position spacing at each object distance are shown in Table 5 below:

[0169] Table 5

[0170]

[0171]

[0172] The aspherical coefficients are shown in Table 6 below:

[0173] Table 6

[0174] K A B C D E 2 0.122 -1.89E-03 -1.14E-02 7.37E-03 -3.83E-03 4.58E-04 3 97.585 9.58E-03 -1.53E-02 -1.14E-03 5.27E-04 1.50E-04 4 -98.999 -1.7OE-02 4.71E-03 -6.08E-03 2.35E-03 -1.16E-04 5 99.000 -5.81E-03 -1.23E-02 9.7OE-03 -2.98E-03 2.23E-04 6 -42.103 -2.84E-02 -1.01E-02 -1.95E-03 7.84E-04 -5.21E-05 7 1.057 -1.22E-02 -7.63E-03 5.80E-04 1.54E-05 2.29E-05 8 -14.269 1.99E-02 7.55E-04 8.88E-04 8.15E-06 -3.69E-07 9 -99.001 4.63E-02 -1.89E-02 8.20E-03 -2.25E-03 3.26E-04 10 99.000 -3.18E-02 -1.84E-02 4.15E-03 -4.04E-04 -2.29E-04 11 64.436 -3.08E-02 -6.37E-03 3.16E-03 -6.61E-04 7.74E-05 12 68.504 -9.06E-02 2.32E-02 -2.79E-03 1.88E-04 -6.96E-06 13 -10.289 -4.80E-02 1.23E-02 -1.65E-03 1.18E-04 -3.60E-06

[0175] The technical indicators of this embodiment are as follows:

[0176] 1. Equivalent focal length: 50 mm, system focal length: f = 6.68 mm @ inf; f = 5.84 mm @ Macro8cm;

[0177] 2. Macro magnification: 0.064x, equivalent magnification: 1.9x;

[0178] 3. Aperture number F#: 2.4 @ inf; 2.38 @ Macro8cm;

[0179] 4. Field of view 2θ: 47.8° @ inf; 48° @ Macro8cm;

[0180] 5. Optical back focal length FBL: 1.0 mm @ inf; 0.756 mm @ Macro8cm;

[0181] 6. Total optical length TTL: 7.3 mm;

[0182] 7. Image height IMH > 6.1 mm, paired with 1 / 3.06” CMOS

[0183] The imaging effect of this embodiment is evaluated by the MTF curves as shown in Figure 21 and Figure 22 . The MTF curves at each field of view decline smoothly, indicating that the optical system has good imaging effects and resolution within the entire field of view from inf to Macro.

[0184] As shown in Figure 23 and Figure 24 , the defocus curves at 110 lp / mm show that the optical system has good control of aberrations within the entire field of view from inf to Macro and has a relatively wide depth of focus.

[0185] As shown in Figure 25 and Figure 26 , the distortion curve of the optical system across the entire field of view shows that the optical distortion of the optical system is within 3% in practice from inf to Macro.

[0186] The above has introduced in detail a medium-long focal length and macro optical system and an electronic device provided by the present invention. For those of ordinary skill in the art, according to the idea of the embodiments of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A medium telephoto and macro optical system, characterized in that, The medium telephoto and macro optical system is composed of a first lens, a second lens, and an image sensor arranged in sequence along the light incident direction; The first lens has a positive focal power, and the second lens has a negative focal power; The first lens includes a first lens barrel, a first lens with a positive focal power, a second lens with a negative focal power, a third lens with a positive focal power, and at least one first aperture stop; the first lens, the first aperture stop, the second lens, and the third lens are arranged in sequence along the light incident direction inside the first lens barrel; the number of lenses included in the first lens is three; The second lens includes a second lens barrel, a fourth lens with a negative focal power, a fifth lens with a focal power, a sixth lens with a negative focal power, and at least one second aperture stop; the fourth lens, the fifth lens, the second aperture stop, and the sixth lens are arranged in sequence along the light incident direction inside the second lens barrel; the number of lenses included in the second lens is three; The second lens is connected with a driving member and can be driven to displace between the first lens and the image sensor to approach or move away from the first lens; Wherein, the focal length f7 of the first lens satisfies: 3.2mm ≤ f7 ≤ 4mm; the focal length f8 of the second lens satisfies: -3.2mm ≤ f8 ≤ -2.2mm.

2. The telephoto and macro optical system according to claim 1, wherein The equivalent focal length of the medium telephoto and macro optical system is 50mm to 60mm, the field of view angle of the medium telephoto and macro optical system is 35° to 45°, and the range of the target surface size of the image sensor is 1 / 4" to 1 / 3.06".

3. The telephoto and macro optical system according to claim 1, wherein The central thickness T1 of the first lens satisfies 2.3mm ≤ T1 ≤ 2.7mm; the central thickness T2 of the second lens satisfies 2.6mm ≤ T2 ≤ 3.6mm; the air gap T3 between the first lens and the second lens satisfies T3 > 0.24mm.

4. The telephoto and macro optical system according to claim 1, wherein The first lens is made of a resin material with a refractive index of 1.52 < Nd1 < 1.56 and a dispersion coefficient of 52 < Vd1 < 58; The second lens is made of a resin material with a refractive index of 1.62 < Nd2 < 1.68 and a dispersion coefficient of 22 < Vd2 < 28; The third lens is made of a resin material with a refractive index of 1.52 < Nd3 < 1.55 and a dispersion coefficient of 53 < Vd3 < 59.

5. The medium telephoto and macro optical system according to claim 1, wherein The fourth lens is made of a resin material with a refractive index of 1.52 < Nd4 < 1.55 and a dispersion coefficient of 53 < Vd4 < 59; The fifth lens is made of a resin material with a refractive index of 1.62 < Nd5 < 1.68 and a dispersion coefficient of 22 < Vd5 < 28; The sixth lens is made of a resin material with a refractive index of 1.52 < Nd1 < 1.56 and a dispersion coefficient of 52 < Vd1 < 58.

6. The telephoto and macro optical system according to claim 1, characterized in that The surface profiles of the 12 surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all even aspherical surfaces, and the aspherical surface profiles satisfy the following formula: Where: Z is the sagitta, which is the distance from the vertex of the aspheric surface to the position at height h along the optical axis direction of the aspheric surface; C = 1 / r, where r represents the radius of curvature of the mirror surface, k is the conic coefficient, A is the 4th-order aspheric coefficient, B is the 6th-order aspheric coefficient, C is the 8th-order aspheric coefficient, D is the 10th-order aspheric coefficient, E is the 12th-order aspheric coefficient, F is the 14th-order aspheric coefficient, and G is the 16th-order aspheric coefficient.

7. The telephoto and macro optical system according to claim 1, wherein A filter is also provided between the second lens and the image sensor.

8. An electronic device, characterized in that, It includes the medium telephoto and macro optical system according to any one of claims 1 to 7.

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