Optical imaging lens and electronic equipment

Abstract

The present invention discloses an optical imaging lens and electronic equipment. The lens includes a stop, and a first lens with positive focal power, the object side of the lens is convex and the image side is concave; a second lens with negative focal power; a third lens with positive focal power; a fourth lens with negative focal power; a fifth lens with negative focal power; a sixth lens with positive focal power; and a seventh lens with negative focal power. The optical TTL of the lens of the present invention is less than 9mm, and adopts a 7-piece glass-plastic hybrid structure design. The overall size of the lens is small and easy to install and use. This solution adopts a design of six plastic aspheric lenses plus one glass aspheric lens; the use of glass aspheric lenses is conducive to correcting system temperature drift. The lens can solve at least one technical shortcoming mentioned in the background technology.

Description

Technical Field

[0001] The present invention relates to the technical field of small-volume high-definition optical lenses, and in particular to an optical imaging lens and electronic equipment. Background Art

[0002] As electronic devices tend to be thinner and lighter, lenses are required to be both miniaturized and have higher imaging quality to meet market demand. However, as the size of the lens decreases, the field of view of the lens will inevitably be sacrificed to a certain extent. For example:

[0003] 1) The optical TTL is too large and has too many lenses, which makes the overall cost and weight of the lens too high, and has limitations on installation and use;

[0004] 2) The lens imaging quality is poor and cannot meet the requirements of high-definition imaging;

[0005] 3) The temperature drift control is poor and VCM is required for focusing, which is costly. Summary of the Invention

[0006] In view of this, the present invention aims to provide an optical imaging lens and an electronic device, which can solve at least one of the technical shortcomings mentioned in the background art.

[0007] According to one aspect of the present invention, there is provided an optical imaging lens, a diaphragm, and,

[0008] a first lens having positive optical power, the object-side surface of the lens being convex and the image-side surface being concave;

[0009] a second lens having negative optical power, the object-side surface of the lens being convex and the image-side surface being concave;

[0010] a third lens having positive optical power, the object-side surface of the lens being convex and the image-side surface being concave;

[0011] a fourth lens element having negative optical power, the object-side surface of the lens being concave and the image-side surface being convex;

[0012] a fifth lens element having negative optical power, the object side surface of the lens being concave and the image side surface being convex;

[0013] a sixth lens having positive optical power;

[0014] The seventh lens has negative optical power.

[0015] In the above technical solution, the front iris can better control the size of the lens head, which is more conducive to lens miniaturization. At the same time, by adjusting the distance between different lenses and the curvature radius and surface shape of each lens, this solution can effectively control system distortion, reduce the volume, correct aberrations, and achieve better image quality.

[0016] In some embodiments, the third lens is a glass aspherical lens, and the remaining lenses are plastic aspherical lenses; the lenses satisfy the following conditional formula:

[0017] TTL<9mm

[0018] Wherein, TTL is the total optical length of the lens.

[0019] In the above technical solution, the optical TTL is less than 9mm, and the 7-piece glass-plastic hybrid structure design makes the lens small in overall size and easy to install and use. This solution uses six plastic aspheric lenses plus one glass aspheric lens design; the use of glass aspheric lenses is beneficial for correcting system temperature drift; at the same time, the reasonable optical power of each lens can better optimize the optical structure while facilitating lens structural design, and is more conducive to lens miniaturization. This solution's lens is paired with a 1-inch sensor, and the MTF from center to edge can reach 86lp / mm>0.4 at room temperature, which greatly improves the lens's imaging quality, meets high-definition imaging requirements, and improves practicality.

[0020] In some embodiments, the lens satisfies the following conditional formula:

[0021] 9<|f1|<11; 16<|f2|<19; 8<|f3|<10; 60<|f4|<145;

[0022] 30<|f5|<100; 15<|f6|<20; 6<|f6|<7

[0023] Where, f1, f2, f3, f 4、 f5, f6, and f7 are the focal lengths of the first, second, third, fourth, fifth, sixth, and seventh lenses, respectively.

[0024] In the above technical solution, by reasonably allocating the optical power of each lens, the aberration of the lens can be effectively balanced and controlled, so that the system can obtain better imaging quality.

[0025] In some embodiments, the lens satisfies the following conditional formula:

[0026] 1.0<|f1 / f|<1.5; 1.5<|f2 / f|<2.5; 1.0<|f3 / f|<1.5; 7.0<|f4 / f|<18.0;

[0027] 3.0<|f5 / f|<12.0; 1.5<|f6 / f|<2.5; 0.5<|f7 / f|<1.0

[0028] Where f is the overall focal length of the lens, f1, f2, f3, f 4、f5, f6, and f7 are the focal lengths of the first, second, third, fourth, fifth, sixth, and seventh lenses, respectively.

[0029] In the above technical solution, by reasonably allocating the optical power of each lens, the aberration of the lens can be effectively balanced and controlled, so that the system can obtain better imaging quality.

[0030] In some embodiments, the lens satisfies the following conditional formula:

[0031] (SG1+SG2+SG3)>0.7

[0032] In the formula, SG1 is the sagittal height of the first lens of the lens close to the image side, SG2 is the sagittal height of the second lens of the lens close to the image side, and SG3 is the sagittal height of the third lens of the lens close to the image side.

[0033] In the above technical solution, satisfying the above formula can enable the system to maintain low distortion with a large field of view and a large image surface.

[0034] In some embodiments, the lens satisfies the following conditional formula:

[0035] 0.1 <N3*CT3 / f3<0.2;dn3 / dt3> 0

[0036] Wherein, N3 is the refractive index of the third lens, CT3 is the center thickness of the third lens on the optical axis, f3 is the focal length of the third lens, and dn3 / dt3 is the refractive index temperature coefficient of the third lens.

[0037] In the above technical solution, satisfying the above formula can better correct the temperature drift of the system, so that the system has a good imaging effect under high and low temperature conditions.

[0038] In some embodiments, the lens satisfies the following conditional formula:

[0039] 1.5 <ALT / AAG<2.1

[0040] Wherein, ALT is the sum of the center thicknesses of the first lens to the seventh lens on the optical axis, and AAG is the sum of the air gaps between the first lens to the seventh lens on the optical axis.

[0041] In the above technical solution, satisfying the above formula can better distribute the optical focal length between the lenses, so that the lens has better imaging quality. At the same time, it can also effectively compress the total length of the lens, which is more conducive to the assembly of the rear-end lens module.

[0042] In some embodiments, the lens satisfies the following conditional formula:

[0043] 4.5<(V1+V3) / V2<6.0; 0.5<(V5+V7) / V6<1.5

[0044] Wherein, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, and V7 is the Abbe number of the seventh lens.

[0045] In the above technical solution, satisfying the above formula can better correct the system aberration, so that the system has lower chromatic aberration and better imaging quality.

[0046] According to another aspect of the present invention, there is provided an electronic device, comprising:

[0047] An image sensor is configured to receive the image formed by the optical imaging lens.

[0048] In the above technical solution, the advantages of the electronic device depend on the optical imaging lens, which will not be explained in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0050] Figure 1 、 Figure 9 、 Figure 17 1 are cross-sectional views of an optical imaging lens (optical system) according to Examples 1 to 3 of the present invention;

[0051] Figure 2 、 Figure 10 、 Figure 18 MTF curves of an optical imaging lens (optical system) according to Examples 1 to 3 of the present invention at 25°C in the visible light range of 435nm-650nm;

[0052] Figure 3 、 Figure 11 、 Figure 19 Defocus curves of an optical imaging lens (optical system) according to Examples 1 to 3 of the present invention under visible light 435nm-650nm;

[0053] Figure 4 、 Figure 12 、 Figure 20These are MTF curves of an optical imaging lens (optical system) according to Examples 1 to 3 of the present invention under visible light 435nm-650nm-30°C;

[0054] Figure 5 、 Figure 13 、 Figure 21 MTF curves of an optical imaging lens (optical system) according to Examples 1 to 3 of the present invention at 70°C in the visible light range of 435nm-650nm;

[0055] Figure 6 、 Figure 14 、 Figure 22 These are lateral chromatic aberration curves of an optical imaging lens (optical system) according to Examples 1 to 3 of the present invention under visible light 435nm-650nm;

[0056] Figure 7 、 Figure 15 、 Figure 23 These are longitudinal chromatic aberration curves of an optical imaging lens (optical system) according to Examples 1 to 3 of the present invention under visible light 435nm-650nm;

[0057] Figure 8 、 Figure 16 、 Figure 24 Graphs showing field curvature and distortion of an optical imaging lens (optical system) according to Examples 1 to 3 of the present invention under visible light ranging from 435 nm to 650 nm are shown respectively.

[0058] Figure 25 It is a structural diagram of an electronic device example 4 of the present invention. DETAILED DESCRIPTION

[0059] The present invention will be described in further detail below with reference to the accompanying drawings and examples. It is particularly noted that the following examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Similarly, the following examples are only some embodiments of the present invention and are not intended to be exhaustive. All other embodiments obtained by those of ordinary skill in the art without creative effort are intended to fall within the scope of protection of the present invention.

[0060] The present invention aims to provide an optical imaging lens and electronic device with high optical performance. Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0061] Figure 1 、 Figure 9 、 Figure 17The following are cross-sectional views of optical imaging lenses (optical systems) according to Examples 1 to 3, respectively. The optical imaging lenses according to each example are used for optical devices including imaging devices such as digital cameras, digital still cameras, broadcast cameras, and surveillance cameras, and interchangeable lenses. In each cross-sectional view, the left side is the object side OBJ and the right side is the image side IMA. In each cross-sectional view, Li represents the i-th lens. ST represents an aperture (fixed aperture or visible aperture). IMA represents an image plane, and when the optical imaging lenses 1 to 3 according to each example are used in the imaging optical system of a digital camera or a digital still camera, a solid-state imaging element (photoelectric conversion element) such as a CMOS image sensor or a CCD image sensor is arranged on the imaging plane IMA.

[0062] The optical imaging lens according to each example includes, in order from the object side to the image side, a stop, and,

[0063] a first lens L1 having positive refractive power, the object-side surface of the lens being convex and the image-side surface being concave;

[0064] a second lens L2 having negative optical power, the object-side surface of the lens being convex and the image-side surface being concave;

[0065] a third lens L3 having positive optical power, the object-side surface of the lens being convex and the image-side surface being concave;

[0066] a fourth lens element L4 having negative optical power, the object side surface of the lens being concave and the image side surface being convex;

[0067] a fifth lens element L5 having negative optical power, the object side surface of the lens being concave and the image side surface being convex;

[0068] a sixth lens L6 having positive refractive power;

[0069] a seventh lens L7 having negative optical power;

[0070] Filter G.

[0071] The lens uses a combination of six plastic aspherical surfaces and one glass aspherical surface (the third lens is a glass aspherical lens, and the rest are plastic aspherical lenses), and adopts an aperture front structure, with the aperture placed in front of the first lens.

[0072] The optical imaging lens according to each example may satisfy at least one of the following setting conditions 1) to 7):

[0073] 1) TTL<9mm;

[0074] 2)9<|f1|<11; 16<|f2|<19; 8<|f3|<10; 60<|f4|<145; 30<|f5|<100; 15<|f6

[0075] |<20;6<|f6|<7;

[0076] 3)1.0<|f1 / f|<1.5; 1.5<|f2 / f|<2.5; 1.0<|f3 / f|<1.5; 7.0<|f4 / f|<18.0;

[0077] 3.0<|f5 / f|<12.0; 1.5<|f6 / f|<2.5; 0.5<|f7 / f|<1.0;

[0078] 4)(SG1+SG2+SG3)>0.7;

[0079] 5)0.1 <N3*CT3 / f3<0.2;dn3 / dt3> 0;

[0080] 6)1.5 <ALT / AAG<2.1;

[0081] 7)4.5<(V1+V3) / V2<6.0; 0.5<(V5+V7) / V6<1.5;

[0082] In the above conditional formula, TTL is the total optical length of the lens; f1, f2, f3, f 4、 f5, f6, and f7 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens, respectively; f is the overall focal length of the lens; SG1 is the sagittal height of the first lens of the lens close to the image side surface, SG2 is the sagittal height of the second lens of the lens close to the image side surface, and SG3 is the sagittal height of the third lens of the lens close to the image side surface; N3 is the refractive index of the third lens, CT3 is the center thickness of the third lens on the optical axis, f3 is the focal length of the third lens, and dn3 / dt3 is the refractive index temperature coefficient of the third lens; ALT is the sum of the center thicknesses of the first lens to the seventh lens on the optical axis, and AAG is the sum of the air gaps from the first lens to the seventh lens on the optical axis; V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, and V7 is the Abbe number of the seventh lens.

[0083] Condition 1) defines the total optical length of the lens. By properly setting this condition, the lens can be compact, making it extremely convenient to install and use. If it exceeds the upper limit, the lens will be too large and cannot meet the requirements of miniaturization.

[0084] Equation 2) defines the focal lengths of each lens. By properly setting these conditions and rationally distributing the focal power of each lens, we can effectively balance and control lens aberrations, enabling the system to achieve optimal imaging quality. Focal lengths above or below the upper limit for these seven focal lengths will result in uneven distribution of lens power, leading to excessive overall lens aberrations and compromising system imaging quality.

[0085] Conditional Equation 3) defines the ratio of the focal length of each lens to the total focal length. By properly setting these conditions and rationally distributing the focal power of each lens, we can effectively balance and control lens aberrations, achieving optimal system imaging quality. Focal lengths above or below the upper limit for these seven focal lengths will result in uneven distribution of lens power, leading to excessive overall lens aberrations and compromising system imaging quality.

[0086] Equation 4 defines the image-side sag of the first three lenses. By properly setting these conditions, the system can maintain low distortion even with a wide field of view and large image area. If the value falls below the lower limit, the lens distortion will be excessive, resulting in severe distortion in the actual shot and reduced image quality.

[0087] Conditional equation 5) defines the ratio of the product of the third lens' refractive index and center thickness to the focal length, as well as the third lens' temperature coefficient. By properly setting these conditions, the system can be effectively corrected for temperature drift, ensuring excellent imaging performance in both high and low temperature conditions. If this product ratio exceeds the upper limit, the lens will be overcorrected for temperature drift, resulting in large defocus and poor imaging quality in both high and low temperature conditions. However, if it is below the lower limit, the lens will be undercorrected for temperature drift, resulting in excessive defocus and poor imaging quality in both high and low temperature conditions. Furthermore, if dn3 / dt3 < 0, the lens will be unable to correct for temperature drift, making it unusable in both high and low temperature conditions.

[0088] Conditional Equation 6) defines the ratio of the sum of the center thicknesses to the sum of the air gaps. By properly setting these conditions, the optical power between the lenses can be better distributed, resulting in a lens with better imaging quality. At the same time, the overall lens length can be effectively compressed, making it more convenient for the assembly of the back-end lens module. If the ratio is higher than the upper limit, the lens air gap will be too small, making it difficult to distribute the optical power between the lenses, affecting the imaging quality. Furthermore, too small an air gap will also affect the lens assembly yield. However, if the ratio is lower than the lower limit, the lens thickness will be too small and the gap will be too large, affecting the lens molding process and making it impossible to guarantee the imaging quality of the actual lens produced. It will also prevent the overall lens length from being effectively compressed, which is not conducive to the miniaturization of the lens.

[0089] Conditional Equation 7 defines the relationships between the first, second, and third lenses, and the fifth, sixth, and seventh lenses, respectively. By properly setting these conditions, system aberrations can be better corrected, resulting in lower chromatic aberration and better image quality. If the conditional Equation exceeds the upper limit, correction of the violet portion of the lens will be difficult, resulting in significant chromatic aberration and noticeable blue-purple fringing in real-life shots. However, if the conditional Equation falls below the lower limit, excessive chromatic aberration will occur, affecting image quality and the quality of the shot.

[0090] A detailed description will now be given of optical imaging lenses according to various examples.

[0091] For the optical structure of Example 1, please refer to Figure 1 The specific parameters of Example 1 are shown in Tables 1 and 2. In Example 1, the focal length of the lens is f = 8.395, the field of view of the lens is FOV = 85°, and the image height of the lens is 16.384. The conditional formula is as follows:

[0092] 1) TTL = 8.99 mm;

[0093] 2)|f1|=9.552; |f2|=18.129; |f3|=9.862; |f4|=87.908; |f5|=33.001;

[0094] |f6|=15.252; |f6|=6.412; (round to three decimal places)

[0095] 3)|f1 / f|=1.388; |f2 / f|=2.159; |f3 / f|=1.175; |f4 / f|=10.471; |f5 / f|=3.931;

[0096] |f6 / f|=1.817; |f7 / f|=0.764; (round to three decimal places)

[0097] 4)(SG1+SG2+SG3)=0.863;

[0098] 5)N3*CT3 / f3=0.106; dn3 / dt3=3.51E-06;

[0099] 6) ALT / AAG=1.881;

[0100] 7) (V1+V3) / V2=5.647; (V5+V7) / V6=1.371; (round to three decimal places)

[0101] Table 1 Example 1 Parameters

[0102]

[0103]

[0104] Table 2 Aspheric coefficient table of Example 1

[0105] Face number K A2 A4 A6 A8 A10 A12 A14 A16 3 0.00 0.00 -2.074E-03 1.266E-03 -1.457E-03 4.434E-04 -1.036E-04 -2.421E-05 4.979E-06 4 0.00 0.00 -1.348E-02 9.963E-03 -4.011E-03 -5.241E-04 3.958E-04 -2.432E-05 -7.175E-06 5 -24.95 0.00 2.839E-02 -1.375E-02 1.036E-02 -6.488E-03 2.162E-03 -2.549E-04 -2.842E-06 6 -8.70 0.00 1.465E-02 1.650E-02 -2.167E-02 1.714E-02 -8.291E-03 2.277E-03 -2.712E-04 7 -8.28 0.00 1.895E-02 1.926E-03 1.604E-03 -5.922E-04 1.536E-04 0.000E+00 0.000E+00 8 -14.12 0.00 8.229E-03 -3.350E-04 3.363E-03 -9.172E-04 3.253E-04 0.000E+00 0.000E+00 9 133.30 0.00 -7.567E-03 -5.778E-03 1.378E-02 -1.197E-02 5.870E-03 -1.431E-03 1.249E-04 10 66.33 0.00 -1.641E-02 1.283E-02 -7.276E-03 3.696E-03 -9.246E-04 8.814E-05 -1.436E-06 11 -51.29 0.00 -3.280E-02 6.586E-03 7.100E-04 -9.121E-04 3.174E-04 -5.429E-05 3.571E-06 12 -101.10 0.00 -3.506E-02 9.290E-03 -2.233E-03 5.232E-04 -8.022E-05 6.402E-06 -2.063E-07 13 7.97 0.00 -2.215E-02 3.139E-03 -2.343E-03 7.294E-04 -1.170E-04 9.531E-06 -3.074E-07 14 -14.79 0.00 6.513E-03 -3.936E-03 5.643E-04 -4.203E-05 1.617E-06 -2.531E-08 1.450E-11 15 -9.72 0.00 -8.636E-03 8.875E-04 -4.662E-05 1.723E-06 -4.500E-08 7.124E-10 -4.959E-12 16 5.37 0.00 -5.089E-03 1.694E-05 2.024E-05 -1.526E-06 4.846E-08 -6.992E-10 3.697E-12

[0106] See also Figure 2 , Example 1 MTF curve at 25°C for visible light 435nm-650nm; the figure shows that the MTF is greater than 0.7 at the center at 86lp / mm and greater than 0.4 at the edge, indicating excellent imaging quality and high lens resolution.

[0107] See also Figure 3 , Example 1 defocus curve diagram under visible light 435nm-650nm; the figure shows that the defocus curves of the lens in each field of view under visible light are relatively concentrated, and the defocus amount is small.

[0108] See also Figure 4 The MTF curve of Example 1 under visible light 435nm-650nm-30℃. As can be seen from the figure, the MTF is greater than 0.7 at the center and greater than 0.4 at the edge at 86lp / mm, indicating good imaging quality even at low temperatures.

[0109] See also Figure 5 , Example 1 MTF curve at 70℃ for visible light 435nm-650nm; As can be seen from the figure, the MTF is greater than 0.3 at 86lp / mm, and it still has good imaging quality at high temperature

[0110] See also Figure 6 Example 1 shows the lateral chromatic aberration curve under visible light of 435nm-650nm. It can be seen that the lens chromatic aberration is within 5μm, with high color reproduction. The blue-purple fringing phenomenon is well corrected under night vision confocal conditions.

[0111] See also Figure 7 , Example 1 longitudinal chromatic aberration curve under visible light 435nm-650nm; it can be seen that the lens has small axial chromatic aberration, good color reproduction, small color difference, and no obvious blue-purple fringing phenomenon;

[0112] See also Figure 8 , Example 1 shows the field curvature and distortion diagram under visible light 435nm-650nm; it can be seen that the field curvature and distortion of the lens at each wavelength are well controlled, and the optical distortion is within 6%, which effectively improves the image quality and facilitates later image correction.

[0113] For the optical structure of Example 2, please refer to Figure 9 The specific parameters of Example 2 are shown in Tables 3 and 4. In Example 2, the focal length of the lens is f = 8.272, the field of view of the lens is FOV = 85°, and the image height of the lens is 16.384. The conditional formula is as follows:

[0114] 1) TTL = 8.99 mm;

[0115] 2)|f1|=9.843; |f2|=17.793; |f3|=9.700; |f4|=60.587; |f5|=96.032;

[0116] |f6|=18.454; |f6|=6.778; (round to three decimal places)

[0117] 3)|f1 / f|=1.190; |f2 / f|=2.151; |f3 / f|=1.173; |f4 / f|=7.324; |f5 / f|=11.609;

[0118] |f6 / f|=2.231; |f7 / f|=0.819; (round to three decimal places)

[0119] 4)(SG1+SG2+SG3)=0.758;

[0120] 5)N3*CT3 / f3=0.133; dn3 / dt3=3.51E-06;

[0121] 6) ALT / AAG=2.042;

[0122] 7) (V1+V3) / V2=5.647; (V5+V7) / V6=1.371; (round to three decimal places)

[0123] Table 3 Example 2 parameter table

[0124]

[0125]

[0126] Table 4 Aspheric coefficient table of Example 2

[0127] Face number K A2 A4 A6 A8 A10 A12 A14 A16 3 0.00 0.00 6.690E-04 6.612E-04 -6.502E-04 1.052E-04 -6.435E-06 -1.184E-05 -1.622E-06 4 0.00 0.00 -6.353E-03 9.107E-03 -4.815E-03 -1.070E-04 2.884E-04 2.859E-05 -1.991E-05 5 -24.10 0.00 3.314E-02 -1.984E-02 1.191E-02 -6.847E-03 2.259E-03 -2.537E-04 -7.759E-06 6 -6.32 0.00 2.720E-03 2.081E-02 -2.362E-02 1.622E-02 -7.637E-03 2.209E-03 -2.765E-04 7 -13.51 0.00 2.456E-02 4.013E-04 -6.541E-04 -2.592E-04 2.114E-04 0.000E+00 0.000E+00 8 -5.06 0.00 2.446E-03 -3.013E-04 2.452E-03 -4.043E-04 1.141E-04 0.000E+00 0.000E+00 9 103.45 0.00 -1.412E-02 -6.898E-04 9.741E-03 -1.114E-02 6.621E-03 -1.876E-03 1.872E-04 10 79.28 0.00 -2.048E-02 1.409E-02 -8.028E-03 3.954E-03 -8.983E-04 2.345E-05 1.058E-05 11 86.83 0.00 -3.987E-02 8.465E-03 1.348E-04 -8.852E-04 3.439E-04 -5.674E-05 2.510E-06 12 -99.12 0.00 -3.798E-02 9.576E-03 -2.282E-03 5.418E-04 -8.187E-05 6.269E-06 -2.207E-07 13 6.64 0.00 -1.833E-02 2.810E-03 -2.343E-03 7.292E-04 -1.176E-04 9.619E-06 -3.102E-07 14 100.63 0.00 7.272E-03 -4.089E-03 5.693E-04 -4.290E-05 1.685E-06 -2.415E-08 -1.119E-10 15 -12.24 0.00 -8.385E-03 8.895E-04 -4.702E-05 1.728E-06 -4.510E-08 7.109E-10 -4.804E-12 16 6.33 0.00 -5.888E-03 4.653E-05 2.062E-05 -1.551E-06 4.854E-08 -7.019E-10 3.771E-12

[0128] See also Figure 10 , Example 2 MTF curve at 25°C for visible light 435nm-650nm; the figure shows that the MTF is greater than 0.7 at the center at 86lp / mm and greater than 0.4 at the edge, indicating excellent imaging quality and high lens resolution.

[0129] See also Figure 11 , Example 2 defocus curve diagram under visible light 435nm-650nm; the figure shows that the defocus curves of the lens in each field of view under visible light are relatively concentrated, and the defocus amount is small.

[0130] See also Figure 12 The MTF curve of Example 2 under visible light 435nm-650nm-30℃. As can be seen from the figure, the MTF is greater than 0.7 at the center and greater than 0.4 at the edge at 86lp / mm, indicating good imaging quality even at low temperatures.

[0131] See also Figure 13 , Example 2 MTF curve at 70℃ for visible light 435nm-650nm; it can be seen from the figure that the MTF is greater than 0.3 at 86lp / mm, and it still has good imaging quality at high temperature.

[0132] See also Figure 14 , Example 2 shows the lateral chromatic aberration curve under visible light 435nm-650nm; it can be seen that the lens chromatic aberration is within 6μm, with high color reproduction, and the blue-purple fringing phenomenon is well corrected under night vision confocal conditions.

[0133] See also Figure 15 , Example 2 longitudinal chromatic aberration curve under visible light 435nm-650nm; it can be seen that the lens has small axial chromatic aberration, good color reproduction, small color difference, and no obvious blue-purple fringing phenomenon.

[0134] See also Figure 16 , Example 2 shows the field curvature and distortion diagram under visible light 435nm-650nm; it can be seen that the field curvature and distortion of the lens at each wavelength are well controlled, and the optical distortion is within 6%, which effectively improves the image quality and facilitates later image correction.

[0135] For the optical structure of Example 3, please refer to Figure 17 The specific parameters of Example 3 are shown in Tables 5 and 6. In Example 3, the focal length of the lens is f = 8.290, the field of view of the lens is FOV = 85°, and the image height of the lens is 16.384. The conditional formula is as follows:

[0136] 1) TTL = 8.97 mm;

[0137] 2)|f1|=10.942; |f2|=16.329; |f3|=8.391; |f4|=141.114; |f5|=39.902;

[0138] |f6|=19.627; |f6|=6.471; (round to three decimal places)

[0139] 3)|f1 / f|=1.320; |f2 / f|=1.970; |f3 / f|=1.012; |f4 / f|=17.022; |f5 / f|=4.813;

[0140] |f6 / f|=2.368; |f7 / f|=0.781; (round to three decimal places)

[0141] 4)(SG1+SG2+SG3)=0.877;

[0142] 5)N3*CT3 / f3=0.133; dn3 / dt3=4.45E-06;

[0143] 6) ALT / AAG=1.695;

[0144] 7) (V1+V3) / V2=4.900; (V5+V7) / V6=0.788; (round to three decimal places)

[0145] Table 5 Example 3 parameter table

[0146]

[0147]

[0148] Table 6 Aspheric coefficient table of Example 3

[0149]

[0150] See also Figure 18 , Example 3 MTF curve at 25°C for visible light 435nm-650nm; the figure shows that the MTF is greater than 0.7 at the center at 86lp / mm and greater than 0.4 at the edge, indicating excellent imaging quality and high lens resolution.

[0151] See also Figure 19 , Example 3 defocus curve diagram under visible light 435nm-650nm; the figure shows that the defocus curves of the lens in each field of view under visible light are relatively concentrated, and the defocus amount is small.

[0152] See also Figure 20 , the MTF curve of Example 3 under visible light 435nm-650nm-30℃; it can be seen from the figure that the MTF is greater than 0.7 at the center and greater than 0.4 at the edge at 86lp / mm, and it still has good imaging quality at low temperatures.

[0153] See also Figure 21 , Example 3 MTF curve at 70℃ for visible light 435nm-650nm; it can be seen from the figure that the MTF is greater than 0.3 at 86lp / mm, and it still has good imaging quality at high temperature.

[0154] See also Figure 22, Example 3 shows the lateral chromatic aberration curve under visible light 435nm-650nm; it can be seen that the lens chromatic aberration is within 6μm, with high color reproduction, and the blue-purple fringing phenomenon is well corrected under night vision confocal conditions.

[0155] See also Figure 23 , Example 3 longitudinal chromatic aberration curve under visible light 435nm-650nm; it can be seen that the lens has small axial chromatic aberration, good color reproduction, small color difference, and no obvious blue-purple fringing phenomenon.

[0156] See also Figure 24 , Example 3 shows the field curvature and distortion diagram under visible light 435nm-650nm; it can be seen that the field curvature and distortion of the lens at each wavelength are well controlled, and the optical distortion is within 6%, which effectively improves the image quality and facilitates later image correction.

[0157] Based on Examples 1 to 4, this case has the following specific advantages:

[0158] 1. The optical TTL is less than 9mm, and it adopts a 7-piece glass-plastic hybrid structure design. The overall size of the lens is small and easy to install and use.

[0159] 2. When paired with a 1-inch sensor, at 86lp / mm, the full-field MTF is greater than 0.4, which can meet high-definition imaging requirements.

[0160] 3. Good temperature drift control, with excellent imaging quality at both high and low temperatures.

[0161] Example 4

[0162] Reference Figure 25 , a description will be given of electronic device A according to Example 4 of the present invention. Figure 25 is a schematic diagram of an electronic device (camera) using any one of the optical imaging lenses according to Examples 1 to 3 for an imaging optical system.

[0163] exist Figure 25 , reference numeral A2 denotes an electronic device body, and reference numeral A1 denotes an imaging optical system (interchangeable lens) including any one of the optical imaging lenses according to Examples 1 to 3. Reference numeral A3 denotes an image sensor (photoelectric conversion element) such as a CMOS image sensor or a CCD image sensor, which is built into the camera body A2 and receives light from the imaging optical system A1 (optical image formed by the imaging optical system A1) and performs photoelectric conversion.

[0164] By using the optical imaging lens according to any one of Examples 1 to 3 for an electronic device such as a digital still camera, it is possible to obtain an electronic device having an optical imaging lens with high optical performance.

[0165] Various examples may provide electronic devices having high optical performance.

[0166] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. An optical imaging lens, characterized in that: From object side to image side, they are: diaphragm, and, a first lens having positive optical power, the object-side surface of the lens being convex and the image-side surface being concave; a second lens having negative optical power, the object-side surface of the lens being convex and the image-side surface being concave; a third lens having positive optical power, the object-side surface of the lens being convex and the image-side surface being concave; a fourth lens element having negative optical power, the object-side surface of the lens being concave and the image-side surface being convex; a fifth lens element having negative optical power, the object side surface of the lens being concave and the image side surface being convex; a sixth lens having positive optical power; a seventh lens having negative optical power; The lens satisfies the following conditional formula: 9<| f1 |<11; 16<| f2 |<19; 8<| f3 |<10; 60<| f4 |<145; 30<| f5 |<100; 15<| f6 |<20; 6<| f6 |<7; Where, f1, f2, f3, f 4、 f5, f6, and f7 are the focal lengths of the first, second, third, fourth, fifth, sixth, and seventh lenses, respectively; The lens satisfies the following conditional formula: 1.0<| f1 / f |<1.5; 1.5<| f2 / f |<2.5; 1.0<| f3 / f |<1.5; 7.0<| f4 / f |<18.0; 3.0<|f5 / f |<12.0; 1.5<| f6 / f |<2.5; 0.5<| f7 / f |<1.0; Where f is the overall focal length of the lens, f1, f2, f3, f 4、 f5, f6, and f7 are the focal lengths of the first, second, third, fourth, fifth, sixth, and seventh lenses, respectively.

2. The optical imaging lens according to claim 1, wherein: The third lens is a glass aspherical lens, and the rest are plastic aspherical lenses; the lens meets the following conditional formula: TTL<9mm Wherein, TTL is the total optical length of the lens.

3. The optical imaging lens according to claim 1, wherein: The lens satisfies the following conditional formula: 8.2mm< EFL <8.4mm; FOV=85°; F#=2.4 Wherein, EFL is the effective focal length of the lens, FOV is the field of view of the lens, and F# is the clear aperture of the lens.

4. The optical imaging lens according to claim 1, wherein: The lens satisfies the following conditional formula: (SG1+SG2+SG3)>0.7 In the formula, SG1 is the sagittal height of the first lens of the lens close to the image side, SG2 is the sagittal height of the second lens of the lens close to the image side, and SG3 is the sagittal height of the third lens of the lens close to the image side.

5. The optical imaging lens according to claim 1, wherein: The lens satisfies the following conditional formula: 0.1 <N3*CT3 / f3<0.2;dn3 / dt3> 0 Wherein, N3 is the refractive index of the third lens, CT3 is the center thickness of the third lens on the optical axis, f3 is the focal length of the third lens, and dn3 / dt3 is the refractive index temperature coefficient of the third lens.

6. The optical imaging lens according to claim 1, wherein: The lens satisfies the following conditional formula: 1.5 <ALT / AAG<2.1 Wherein, ALT is the sum of the center thicknesses of the first lens to the seventh lens on the optical axis, and AAG is the sum of the air gaps between the first lens to the seventh lens on the optical axis.

7. The optical imaging lens according to claim 1, wherein: The lens satisfies the following conditional formula: 4.5<(V1+V3) / V2<6.0; 0.5<(V5+V7) / V6<1.5 Wherein, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, and V7 is the Abbe number of the seventh lens.

8. An electronic device, characterized in that: An optical imaging lens according to any one of claims 1 to 7; and An image sensor is configured to receive the image formed by the optical imaging lens.

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