Medium-long focal length and micro-distance optical system and electronic equipment

Abstract

The invention discloses a medium-long-focus and micro-distance optical system and electronic equipment, which can realize a long-focus and micro-distance shooting function so as to meet almost all-scene shooting requirements and effectively reduce the number of cameras required by the electronic equipment. The medium-long focal length and micro-distance optical system comprises a first lens, a second lens and an image sensor which are sequentially arranged according to a light inlet direction, the second lens is connected with a driving piece and can be driven to move between the first lens and the image sensor so as to be close to or far away from the first lens; wherein the focal length f7 of the first lens is greater than or equal to 3.2 mm and less than or equal to 4mm; and the focal length f8 of the second lens is greater than or equal to-3.2 mm and less than or equal to-2.2 mm.

Description

Technical Field

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

[0002] The shooting function has become a basic function of most electronic devices (for example, smart phones, tablets, etc.). With the popularity of shooting functions in electronic devices, users have higher and higher requirements for the shooting quality of electronic devices. For electronic devices, different cameras are needed in different shooting scenes. For example, different cameras are needed in scenes such as telephoto shooting and macro shooting. In order to achieve the shooting functions of the above scenes, this also leads to a large number of cameras in electronic devices, which is not conducive to the lightweight processing of electronic devices and increases the production costs of manufacturers.

[0003] Therefore, finding a technical solution that can solve the above technical problems has become an important topic studied by technical personnel in this field. Summary of the invention

[0004] The embodiment of the present invention discloses a medium-long focal length and macro optical system and electronic equipment to solve the above technical problems.

[0005] The present invention provides a medium-long focal length and macro optical system, comprising a first lens, a second lens and an image sensor arranged in sequence according to a light input direction;

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

[0007] 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 50-60 mm, the field of view angle of the medium-long focal length and macro optical system is 35-45°, and the target surface size of the image sensor ranges from 1 / 4" to 1 / 3.06".

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

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

[0011] The first lens, the first aperture, the second lens, and the third lens are sequentially arranged inside the first lens barrel according to the light input direction.

[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 comprises a second lens barrel, a fourth lens, a fifth lens, a sixth lens and at least one second aperture;

[0016] The fourth lens, the fifth lens, the second aperture and the sixth lens are sequentially arranged inside the second lens barrel according to the light input direction.

[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 an dispersion coefficient of 52<Vd1<58.

[0020] Optionally, 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-order aspheric surfaces, and the aspheric surface shape satisfies the following formula:

[0021]

[0022] Where: Z is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis;

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

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

[0025] An embodiment of the present invention discloses an electronic device, comprising the above-mentioned medium-long focal length and macro optical system.

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

[0027] The second lens of the medium-long focal length and macro optical system of the present invention can be moved closer to or farther from the first lens under the drive of the driving member. In the above design, when long focal length shooting is required, the second lens can be driven to move in the direction of the first lens to get closer to the first lens; when close-up or macro shooting is required, the second lens can be driven to move away from the first lens to a suitable position. Through the above design, the long focal length and macro optical system can realize the 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 equipment, and thus reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic structural diagram of a medium-long focal length and macro optical system provided by the present invention when in a long focal length shooting state;

[0030] Figure 2 A schematic structural diagram of a medium-long focal length and macro optical system provided by the present invention when in a macro shooting state;

[0031] Figure 3 This is a light path diagram of the medium-long focal length and macro optical system in the first embodiment of the present invention when it is in a long focal length shooting state;

[0032] Figure 4 This is a light path diagram of the medium-long focal length and macro optical system in the first embodiment of the present invention when it is in a macro shooting state;

[0033] Figure 5 for Figure 3 Evaluation of the MTF curve corresponding to the medium-telephoto and macro optical system;

[0034] Figure 6 for Figure 4 Evaluation of the MTF curve corresponding to the medium-telephoto and macro optical system;

[0035] Figure 7for Figure 3 Defocus curve corresponding to the medium-telephoto and macro optical system;

[0036] Figure 8 for Figure 4 Defocus curve corresponding to the medium-telephoto and macro optical system;

[0037] Fig. 9 for Figure 3 Distortion curve corresponding to the medium-telephoto and macro optical system;

[0038] Fig.10 for Figure 4 Distortion curve corresponding to the medium-telephoto and macro optical system;

[0039] Fig.11 This is a light path diagram of the medium-long focal length and macro optical system in the second embodiment of the present invention when it is in a long focal length shooting state;

[0040] Fig.12 is a light path diagram of the medium-long focal length and macro optical system in the second embodiment of the present invention when it is in a macro shooting state;

[0041] Fig.13 for Fig.11 Evaluation of the MTF curve corresponding to the medium-telephoto and macro optical system;

[0042] Fig.14 for Fig.12 Evaluation of the MTF curve corresponding to the medium-telephoto and macro optical system;

[0043] Fig.15 for Fig.11 Defocus curve corresponding to the medium-telephoto and macro optical system;

[0044] Fig.16 for Fig.12 Defocus curve corresponding to the medium-telephoto and macro optical system;

[0045] Fig.17 for Fig.11 Distortion curve corresponding to the medium-telephoto and macro optical system;

[0046] Fig.18 for Fig.12 Distortion curve corresponding to the medium-telephoto and macro optical system;

[0047] Fig.19 This is a light path diagram of the medium-long focal length and macro optical system in Embodiment 3 of the present invention when it is in a long focal length shooting state;

[0048] Fig. 20 This is a light path diagram of the medium-long focal length and macro optical system in Embodiment 3 of the present invention when it is in a macro shooting state;

[0049] Fig.21 for Fig.19 Evaluation of the MTF curve corresponding to the medium-telephoto and macro optical system;

[0050] Fig. 22 for Fig. 20 Evaluation of the MTF curve corresponding to the medium-telephoto and macro optical system;

[0051] Fig.23 for Fig.19 Defocus curve corresponding to the medium-telephoto and macro optical system;

[0052] Fig.24 for Fig. 20 Defocus curve corresponding to the medium-telephoto and macro optical system;

[0053] Fig.25 for Fig.19 Distortion curve corresponding to the medium-telephoto and macro optical system;

[0054] Fig.26 for Fig. 20 Distortion curve corresponding to the medium-telephoto and macro optical system;

[0055] Illustration: first lens 1; first lens 11; second lens 12; third lens 13; second lens 2; fourth lens 21; fifth lens 22; sixth lens 23; filter 3; image sensor 4. DETAILED DESCRIPTION

[0056] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0057] See also Figure 1 to Figure 2 The present invention provides a medium-long focal length and macro optical system, comprising a first lens 1, a second lens 2 and an image sensor 4 arranged in sequence according to the light input direction;

[0058] The second lens 2 is connected to a driving member and the second lens 2 can be driven to move between the first lens 1 and the image sensor 4 to get closer to or farther 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 50-60 mm, the field of view angle of the medium-long focal length and macro optical system is 35-45°, 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 interval T3 between the first lens 1 and the second lens 2 satisfies T3>0.24mm, thereby satisfying the separation of the lens barrel structure in 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;

[0070] The first lens 11, the first aperture, the second lens 12, and the third lens 13 are sequentially arranged inside the first lens barrel according to the light input direction.

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

[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 an dispersion coefficient of 53<Vd3<59.

[0075] It should be noted that the above parameter range can ensure that the telephoto and macro optical system in the present application can shorten the total optical length while ensuring a large field of view and a large amount of light input, thereby facilitating size reduction and correcting chromatic aberration. In addition, the above lenses are made of resin materials to 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;

[0077] The fourth lens 21, the fifth lens 22, the second aperture and the sixth lens 23 are sequentially arranged inside the second lens barrel according to the light input direction.

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

[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 an Abbe number of 52<Vd1<58.

[0082] It should be noted that the above parameter range can ensure that the telephoto and macro optical system in the present application can shorten the total optical length while ensuring a large field of view and a large amount of light input, thereby facilitating size reduction and correcting chromatic aberration. In addition, the above lenses are made of resin materials to reduce production costs.

[0083] Furthermore, 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 aspheric surfaces, and the aspheric surface shape satisfies the following formula:

[0084]

[0085] Where: Z is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis;

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

[0087] Furthermore, a filter 33 is disposed 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 messy light by selectively transmitting or absorbing light within a specific frequency range, so that the image sensor 4 obtains appropriate light.

[0089] See also Figure 1 to Figure 2 The present invention provides an electronic device, comprising the above-mentioned medium-long focal length and macro optical system.

[0090] The electronic device may specifically be a smart phone, a tablet computer, a laptop computer, etc., and this embodiment does not limit this.

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

[0092] The wide-angle camera has an equivalent focal length of 20 to 25 mm, a field of view of 80 to 90°, and a target surface size of the image sensor 4 ranging from 1 / 3.06" to 1 / 2.78";

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

[0094] 1. It can cover wide-angle, telephoto, and macro shooting functions, meeting the shooting needs of almost all scenes, and reducing the number of cameras in electronic equipment, saving production costs.

[0095] 2. The medium-telephoto and macro optical system has excellent portrait shooting focal length and portrait shooting effect;

[0096] 3. Internal focus realizes auto focus from infinity to macro. The height of the first lens 1 is fixed and does not change with the change of the photographed object, and the second lens 2 has a small movement range;

[0097] 4. The medium-telephoto and macro optical system has a large magnification ratio and can capture distant details, solving problems such as light being blocked when taking close-up shots and edge distortion of wide-angle lenses.

[0098] The following is a specific example to illustrate the effect of the medium-long focal length and macro optical system provided by the embodiment of the present application.

[0099] Embodiment 1

[0100] See also Figures 3 to 10 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;

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

[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 of the first lens 1 is f7=3.32 mm;

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

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

[0106] The center thickness of the second lens 2 T2 = 2.62 mm;

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

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

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

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

[0111] Table 1

[0112]

[0113] The aspheric coefficients are shown in Table 2 below:

[0114] Table 2

[0115] 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 -3.40E-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

[0116] The technical indicators of this embodiment are as follows:

[0117] 1. Equivalent focal length: 52mm, system focal length: f=5.47mm@inf; f=4.52mm@Macro5cm;

[0118] 2. Macro magnification: 0.11x; equivalent magnification: 4.1x;

[0119] 3. Aperture number F#: 2.4@inf; 2.86@Macro5cm;

[0120] 4. Field of view 2θ: 45.8°@inf; 45.4°@Macro5cm;

[0121] 5. Optical back focus FBL: 0.97mm@inf; 0.66mm@Macro5cm;

[0122] 6. Total optical length TTL: 6.42mm;

[0123] 7. Image height IMH>4.8mm, with 1 / 4” CMOS.

[0124] The imaging effect of this embodiment is as follows Figure 5 and Figure 6 The MTF curve evaluation shown in the figure shows that the MTF curves under each field of view all decrease smoothly, indicating that the optical system has good imaging effect and resolution in the entire field of view from inf to Macro.

[0125] like Figure 7 and Figure 8 As shown, the defocus curve at 110lp / mm shows that the optical system has good control over the aberration of the entire field of view from inf to Macro and has a wider depth of focus.

[0126] like Fig. 9 and Fig.10 The full field distortion curve of the optical system shown shows that the optical distortion of the optical system from inf to Macro is actually within 3%.

[0127] Embodiment 2

[0128] See also Figures 11 to 18 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;

[0129] The first lens 1 includes an aperture stop, a first lens 11, a second lens 12, and a third lens 13;

[0130] The second lens 2 includes a light shielding stop, a fourth lens 21, a fifth lens 22 and a sixth lens 23;

[0131] The focal length of the first lens 1 is f7=3.86 mm;

[0132] The focal length of the second lens 2 is f8 = -3.04 mm;

[0133] The center thickness of the first lens 1 is T1 = 2.35 mm;

[0134] The center thickness of the second lens 2 T2 = 3.27 mm;

[0135] The air gap between the two lenses at the distance of the photographed object is 0.375mm≤T3≤0.649mm;

[0136] The first lens 11 is an aspheric lens with positive power, the second lens 12 is an aspheric lens with negative power, the third lens 13 is an aspheric lens with positive power, the fourth lens 21 is an aspheric lens with negative power, the fifth lens 22 is an aspheric lens with negative power, and the sixth lens 23 is an aspheric lens with negative power, all of which are made of resin;

[0137] The focal lengths of each lens are f1=4.70mm, f2=-6.72mm, f3=4.51mm, f4=-12.77mm, f5=-41.62mm, and f6=-5.73mm.

[0138] The relevant parameters of each lens and the lens moving position spacing at each object distance are shown in Table 3 below:

[0139] Table 3

[0140]

[0141] The aspheric coefficients are shown in Table 4 below:

[0142] Table 4

[0143] 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 -1.6gE-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 4.70E-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 10 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

[0144] The technical indicators of this embodiment are as follows:

[0145] 1. Equivalent focal length: 60mm, system focal length: f=6.35mm@inf; f=5.5mm@Macro8cm;

[0146] 2. Macro magnification: 0.073x Equivalent magnification: 3.7x;

[0147] 3. Aperture number F#: 2.23@inf; 2.19@Macro8cm

[0148] 4. Field of view 2θ: 42.5°@inf; 42°@Macro8cm

[0149] 5. Optical back focus FBL: 1.01mm@inf; 0.74mm@Macro8cm

[0150] 6. Total optical length TTL: 7mm

[0151] 7. Image height IMH>4.8mm with 1 / 4” CMOS

[0152] The imaging effect of this embodiment is as follows Fig.13 and Fig.14 The MTF curve evaluation shown in the figure shows that the MTF curves under each field of view all decrease smoothly, indicating that the optical system has good imaging effect and resolution in the entire field of view from inf to Macro.

[0153] like Fig.15 and Fig.16 As shown, the defocus curve at 110lp / mm shows that the optical system has good control over the aberration of the entire field of view from inf to Macro and has a wider depth of focus.

[0154] like Fig.17 and Fig.18 As shown in the full field distortion curve of the optical system, the optical distortion of the surface optical system from inf to Macro is actually within 3%.

[0155] Embodiment 3

[0156] See also 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;

[0157] The first lens 1 includes an aperture stop, a first lens 11, a second lens 12, and a third lens 13;

[0158] The second lens 2 includes a light shielding stop, a fourth lens 21, a fifth lens 22 and a sixth lens 23;

[0159] The focal length of the first lens 1 is f7=3.92 mm;

[0160] The focal length of the second lens 2 is f8 = -2.98 mm;

[0161] The center thickness of the first lens 1 is T1 = 2.42 mm;

[0162] The center thickness of the second lens 2 is T2 = 3.52 mm;

[0163] The air gap between the two lenses at the distance of the photographed object is 0.357mm≤T3≤0.605mm;

[0164] The first lens 11 is an aspheric lens with positive power, the second lens 12 is an aspheric lens with negative power, the third lens 13 is an aspheric lens with positive power, the fourth lens 21 is an aspheric lens with negative power, the fifth lens 22 is an aspheric lens with negative power, and the sixth lens 23 is an aspheric lens with negative power, all of which are made of resin;

[0165] The focal lengths of each lens are f1=4.73mm, f2=-7.54mm, f3=4.89mm, f4=-9.21mm, f5=-116.59mm, and f6=-6.34mm.

[0166] The relevant parameters of each lens and the lens moving position spacing at each object distance are shown in Table 5 below:

[0167] Table 5

[0168]

[0169]

[0170] The aspheric coefficients are shown in Table 6 below:

[0171] Table 6

[0172] 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 -1.70E-02 4.71E-03 -6.08E-03 2.35E-03 -1.16E-04 5 99.000 -5.81E-03 -1.23E-02 9.70E-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

[0173] The technical indicators of this embodiment are as follows:

[0174] 1. Equivalent focal length: 50mm, system focal length: f=6.68mm@inf; f=5.84mm@Macro8cm;

[0175] 2. Macro magnification: 0.064x Equivalent magnification: 1.9x;

[0176] 3. Aperture number F#: 2.4@inf; 2.38@Macro8cm;

[0177] 4. Field of view 2θ: 47.8°@inf; 48°@Macro8cm;

[0178] 5. Optical back focus FBL: 1.0mm@inf; 0.756mm@Macro8cm;

[0179] 6. Total optical length TTL: 7.3mm;

[0180] 7. Image height IMH>6.1mm with 1 / 3.06” CMOS

[0181] The imaging effect of this embodiment is as follows Fig.21 and Fig. 22 The MTF curve evaluation shown in the figure shows that the MTF curves under each field of view all decrease smoothly, indicating that the optical system has good imaging effect and resolution in the entire field of view from inf to Macro.

[0182] like Fig.23 and Fig.24 As shown, the defocus curve at 110lp / mm shows that the optical system has good control over the aberration of the entire field of view from inf to Macro and has a wider depth of focus.

[0183] like Fig.25 and Fig.26 As shown in the full field distortion curve of the optical system, the optical distortion of the surface optical system from inf to Macro is actually within 3%.

[0184] The above is a detailed introduction to a medium-long focal length and macro optical system and an electronic device provided by the present invention. For a person skilled in the art, according to the concept of the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A medium-long focal length and macro optical system, characterized in that: It includes a first lens, a second lens and an image sensor which are arranged in sequence according to the light input direction; The second lens is connected to a driving member and the second lens can be driven to move between the first lens and the image sensor to be closer to or farther from the first lens; 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.

2. The medium-long focal length and macro optical system according to claim 1, characterized in that: The equivalent focal length of the medium-long focal length and macro optical system is 50-60 mm, the field of view of the medium-long focal length and macro optical system is 35-45°, and the target surface size of the image sensor ranges from 1 / 4" to 1 / 3.06".

3. The medium-long focal length and macro optical system according to claim 1, characterized in that: The center thickness T1 of the first lens satisfies 2.3mm≤T1≤2.7mm; the center thickness T2 of the second lens satisfies 2.6mm≤T2≤3.6mm; and the air interval T3 between the first lens and the second lens satisfies T3>0.24mm.

4. The medium-long focal length and macro optical system according to claim 1, characterized in that: The first lens comprises a first lens barrel, a first lens, a second lens, a third lens and at least one first aperture; The first lens, the first aperture, the second lens, and the third lens are sequentially arranged inside the first lens barrel according to the light input direction.

5. The medium-long focal length and macro optical system according to claim 4, characterized in that: 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.

6. The medium-long focal length and macro optical system according to claim 4, characterized in that: The second lens comprises a second lens barrel, a fourth lens, a fifth lens, a sixth lens and at least one second aperture; The fourth lens, the fifth lens, the second aperture and the sixth lens are sequentially arranged inside the second lens barrel according to the light input direction.

7. The medium-long focal length and macro optical system according to claim 6, characterized in that: 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 an dispersion coefficient of 52<Vd1<58.

8. The medium-long focal length and macro optical system according to claim 6, characterized in that: 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-order aspheric surfaces, and the aspheric surface shape satisfies the following formula: ； Where: Z is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; C=1 / r, r represents the radius of curvature of the lens surface, k is the cone coefficient, A is the 4th aspheric coefficient, B is the 6th aspheric coefficient, C is the 8th aspheric coefficient, D is the 10th aspheric coefficient, E is the 12th aspheric coefficient, F is the 14th aspheric coefficient, and G is the 16th aspheric coefficient.

9. The medium-long focal length and macro optical system according to claim 1, characterized in that: A filter is also arranged between the second lens and the image sensor.

10. An electronic device, characterized in that: It comprises the medium-long focal length and macro optical system as claimed in any one of claims 1 to 9.

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