Optical imaging system, imaging device and electronic equipment

Abstract

The present invention provides an optical imaging system which sequentially includes a first lens with a positive optical power from the object side to the image side; a second lens with a negative optical power; a third lens with a negative optical power; a fourth lens with an optical power; and a fifth lens with an optical power; wherein, the optical imaging system satisfies the conditional formula: 0.5 < map2 / map1; where map2 is the clear aperture of light rays on the image side surface of the fifth lens when the field angle in the diagonal direction of the optical imaging system is the largest; and map1 is the clear aperture of light rays of the central field on the image side surface of the fifth lens. The optical imaging system of the present invention has a large light incident amount while ensuring miniaturization, a high relative brightness, and high imaging quality in an environment with insufficient light. In addition, the present invention also provides an imaging device and an electronic device.

Description

Technical Field

[0001] The present invention relates to optical imaging technology, and in particular to an optical imaging system, an imaging device and an electronic device. Background Art

[0002] With the continuous development of camera-related technologies, photography has become a standard feature of smart electronic products, and consumers are increasingly demanding electronic products with ideal photography effects. Some high-pixel optical imaging systems, combined with the application of optimized software algorithms, have excellent photography effects, providing consumers with an excellent experience. However, with the improvement in performance and increase in size of commonly used photosensitive elements such as charge coupled devices (CCDs) or complementary metal-oxide semiconductors (CMOSs), the increase in the number of pixels in the photosensitive elements and the decrease in pixel size have placed higher demands on the miniaturization of imaging lenses. In addition, for low-light environments such as night, rainy days, and starry skies, the amount of light entering the lens is required to be even higher. At the same time, to ensure high imaging quality of optical lenses, more lenses are required, which inevitably brings more difficulties to the miniaturization design of the lens. Existing optical imaging systems, while meeting the requirements of miniaturization, have relatively low brightness and cannot well meet the needs of shooting in low-light environments. Summary of the Invention

[0003] In view of this, the present invention provides an optical imaging system that ensures miniaturization while having a large amount of light input, high relative brightness, and high imaging quality in low-light environments.

[0004] It is also necessary to provide an imaging device using the above optical imaging system.

[0005] In addition, it is also necessary to provide an electronic device using the above-mentioned orientation device.

[0006] An optical imaging system, comprising, from the object side to the image side, the following components:

[0007] a first lens having positive optical power;

[0008] a second lens having negative optical power;

[0009] a third lens having negative optical power;

[0010] a fourth lens having optical power; and

[0011] a fifth lens having optical power;

[0012] Wherein, the optical imaging system satisfies the conditional formula: 0.5 <map2 / map1;

[0013] Among them, map2 is the light aperture of the light on the side of the image of the fifth lens when the diagonal field of view of the optical imaging system is the largest; map1 is the light aperture of the central field of view light on the side of the image of the fifth lens.

[0014] When the ratio of map2 / map1 is greater than 0.5, it is beneficial to improve the relative brightness of the optical imaging system, making the optical imaging system more suitable for shooting environments with insufficient light.

[0015] The first, second, third, fourth, and fifth lenses are all aspherical lenses. Using aspherical lenses allows for easy fabrication into shapes other than spherical surfaces, providing more control variables and helping to reduce aberrations. This allows for better imaging with fewer lenses, further reducing the number of lenses and achieving miniaturization.

[0016] The object side of the first lens is convex near the optical axis and concave at the circumference, while the image side is convex at the circumference. This helps to improve the optical power, better focus light, and reduce spherical aberration.

[0017] The second lens has a convex surface at the periphery of the object side and a concave surface at the periphery near the optical axis of the image side. This helps to diverge light, compensate for the first lens, and reduce chromatic aberration.

[0018] The third lens has a concave surface on its object side near the optical axis and a convex surface on its circumference, while the image side has a concave surface on its circumference. This helps to diverge light, compensate for the first lens, reduce chromatic aberration, and increase the focal length of the optical imaging system.

[0019] The image side surface of the fourth lens is convex near the optical axis and the circumference, which is conducive to increasing the incident cone angle of light, thereby improving the relative brightness of the optical imaging system.

[0020] The optical imaging system further includes an infrared filter located between the fifth lens and the imaging surface. The infrared filter can filter out infrared light, reduce some ghosting and stray light, and also provide some protection for the photosensitive element.

[0021] Wherein, the optical imaging system satisfies the following conditional formula:

[0022] TTL / Imgh<2.05;

[0023] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and Imgh is half of the diagonal length of the effective pixel area of the optical imaging system on the imaging surface.

[0024] When TTL / Imgh < 2.05, it is beneficial to the miniaturization of the optical imaging system.

[0025] Among them, the optical imaging system satisfies the following conditional formula:

[0026] TTL / f < 0.95;

[0027] Among them, f is the effective focal length of the optical imaging system, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0028] When TTL / f < 0.95, it is beneficial to the miniaturization of the optical imaging system.

[0029] Among them, the optical imaging system satisfies the following conditional formula:

[0030] 3.2 < TTL / T34 < 4.5;

[0031] Among them, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis, and T34 is the air gap on the optical axis between the third lens and the fourth lens.

[0032] When 3.2 < TTL / T34 < 4.5, it can effectively increase the light exit angle of the marginal field of view, thereby improving the relative brightness of the optical imaging system.

[0033] Among them, the optical imaging system satisfies the following conditional formula:

[0034] 0 < dist1 - dist2 < 0.015;

[0035] Among them, dist1 is the optical distortion of the maximum field of view of the optical imaging system, and dist2 is the optical distortion in the narrow side direction of the effective pixel area of the imaging surface.

[0036] When 0 < dist1 - dist2 < 0.015, it can effectively reduce the distortion of the overall imaging picture of the optical imaging system.

[0037] Among them, the optical imaging system satisfies the following conditional formula:

[0038] (R9 + R10) / (R9 - R10) < -50;

[0039] Among them, R9 is the curvature radius of the object side surface of the fifth lens on the optical axis, and R10 is the curvature radius of the image side surface of the fifth lens on the optical axis.

[0040] When (R9+R10) / (R9-R10)<-50, the curvature radius of the object side of the third lens at the optical axis and the curvature radius of the image side at the optical axis are more appropriate, which can reasonably increase the incident angle to meet the image height requirement of the optical imaging system, while reducing the sensitivity of the optical imaging system and improving assembly stability.

[0041] Wherein, the optical imaging system satisfies the following conditional formula:

[0042] Imgh / tan(HFOV)>6;

[0043] Among them, Imgh is half of the diagonal length of the effective pixel area of the optical imaging system on the imaging surface, and HFOV is half of the maximum field of view of the optical imaging system.

[0044] When Imgh / tan(HFOV)>6, it is beneficial to maintain the telephoto characteristics of the optical imaging system.

[0045] An imaging device, comprising:

[0046] The above-mentioned optical imaging system; and

[0047] A photosensitive element is located on the image side of the optical imaging system.

[0048] The imaging device of the present invention has a large amount of light input and high relative brightness while ensuring miniaturization, and has high imaging quality in low-light environments.

[0049] An electronic device comprising:

[0050] Equipment body and;

[0051] The above-mentioned imaging device is installed on the device body.

[0052] The electronic device of the present invention has a large amount of light intake and high relative brightness while ensuring miniaturization, and has high imaging quality in low-light environments.

[0053] Therefore, the optical imaging system of the present invention has a large amount of light input and high relative brightness while ensuring miniaturization, and has high imaging quality in low-light environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the structural features and effects of the present invention, it is described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] Figure 1-1 Schematic diagram of the structure of the optical imaging system according to the first embodiment of the present invention.

[0056] Figure 1-2From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the first embodiment of the present invention.

[0057] Figure 2-1 2 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present invention.

[0058] Figure 2-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the second embodiment of the present invention.

[0059] Figure 3-1 2 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present invention.

[0060] Figure 3-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the third embodiment of the present invention.

[0061] Figure 4-1 FIG. 4 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention.

[0062] Figure 4-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the fourth embodiment of the present invention.

[0063] Figure 5-1 FIG. 5 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.

[0064] Figure 5-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the fifth embodiment of the present invention.

[0065] Figure 6-1 2 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention.

[0066] Figure 6-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the sixth embodiment of the present invention.

[0067] Figure 7 A schematic structural diagram of an imaging device according to an embodiment of the present invention.

[0068] Figure 8 A schematic structural diagram of an electronic device according to an embodiment of the present invention. Specific embodiments

[0069] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0070] Please refer to Figure 1-1 , Figure 2-1 , Figure 3-1 , Figure 4-1 , Figure 5-1 and Figure 6-1 , the optical imaging system 100 of the embodiment of the present invention is applied to imaging devices such as mobile phones and drones, and sequentially includes a first lens L1 with a positive optical power, a second lens L2 with a negative optical power, a third lens L3 with a negative optical power, a fourth lens L4 with an optical power, and a fifth lens L5 with an optical power from the object side to the image side.

[0071] "Focal power" is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam, and it characterizes the ability of an optical system to deflect light rays.

[0072] Among them, the optical imaging system 100 satisfies the conditional formula: 0.5 < map2 / map1; where map2 is the clear aperture of the light ray on the image side surface of the fifth lens when the maximum field angle in the diagonal direction of the optical imaging system; map1 is the clear aperture of the central field light ray on the image side surface of the fifth lens. More specifically, map2 / map1 can be 0.51, 0.55, 0.58, 0.60, 0.7, 0.8, 0.9, etc. When the ratio of map2 / map1 is greater than 0.5, it is beneficial to improve the relative brightness of the optical imaging system.

[0073] The optical imaging system 100 of the present invention has a large light input while ensuring miniaturization, high relative brightness, and high imaging quality in low-light environments.

[0074] Optionally, the first lens L1 is made of glass or plastic, and has an object side surface S1 and an image side surface S2. The object side surface S1 and the image side surface S2 can be spherical surfaces or aspherical surfaces. The object side surface S1 is convex near the optical axis and concave at the circumference, and the image side surface S2 can be convex or concave near the optical axis and convex at the circumference. The surface type design of the first lens L1 is beneficial to increase the optical power, better converge light rays, and weaken spherical aberration. Using an aspherical lens can be easily made into a shape other than a spherical surface, obtaining more control variables, which is beneficial to reducing aberration, and has the advantage of obtaining good imaging with a smaller number of lenses; thereby reducing the number of lenses and meeting the miniaturization requirement.

[0075] An “aspherical lens” refers to a lens with at least one aspherical surface.

[0076] Optionally, the second lens L2 is made of plastic or glass and has an object-side surface S3 and an image-side surface S4. The object-side surface S3 and the image-side surface S4 can be spherical or aspherical. The object-side surface S3 can be convex or concave near the optical axis and convex at the circumference, while the image-side surface S4 is concave near the optical axis and at the circumference. The surface design of the second lens L2 is conducive to diverging light, compensating with the first lens, and reducing chromatic aberration. At the same time, the use of aspherical lenses can easily make shapes other than spherical surfaces, obtaining more control variables, which is conducive to reducing aberrations and achieving the advantage of good imaging with fewer lenses; thereby reducing the number of lenses and meeting miniaturization requirements.

[0077] Optionally, the third lens L3 is made of plastic or glass, and has an object side surface S5 and an image side surface S6. The object side surface S5 and the image side surface S6 can be spherical or aspherical. The object side surface S5 is concave near the optical axis and convex at the circumference, and the image side surface S6 can be convex or concave near the optical axis and concave at the circumference. The surface design of the third lens L3 is conducive to diverging light, compensating with the first lens, reducing chromatic aberration, and at the same time, improving the focal length of the optical imaging system 100. The use of aspheric lenses can easily make shapes other than spherical surfaces, obtain more control variables, help eliminate aberrations, and obtain the advantage of good imaging with fewer lenses; thereby reducing the number of lenses and meeting miniaturization requirements.

[0078] Optionally, the fourth lens L4 is made of plastic or glass and has an object-side surface S7 and an image-side surface S8. The object-side surface S7 and the image-side surface S8 can be spherical or aspherical. The object-side surface S7 can be convex or concave near the optical axis and can be convex or concave at the circumference, while the image-side surface S8 is convex near the optical axis and at the circumference. The fourth lens L4 is beneficial for increasing the incident cone angle of light, thereby improving the relative brightness of the optical imaging system 100. The use of an aspherical lens can easily produce a shape other than a spherical surface, obtain more control variables, and help to reduce aberrations. It is advantageous to obtain the advantage of good imaging with fewer lenses; thereby reducing the number of lenses and meeting miniaturization requirements.

[0079] Optionally, the fourth lens L4 can have positive or negative optical power. Optionally, the fifth lens L5 is made of plastic or glass and has an object-side surface S9 and an image-side surface S10. Both the object-side surface S9 and the image-side surface S10 can be spherical or aspherical. The object-side surface S9 can be convex or concave near the optical axis and can be convex or concave at the circumference. The image-side surface S10 can be convex or concave near the optical axis and can be convex or concave at the circumference. The use of aspherical lenses can easily produce shapes other than spherical surfaces, obtaining more control variables, which is beneficial for reducing aberrations and achieving the advantage of good imaging with fewer lenses; thereby reducing the number of lenses and meeting miniaturization requirements.

[0080] Optionally, the fifth lens L5 may have positive or negative refractive power.

[0081] In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all made of plastic, which can reduce the weight of the optical imaging system 100 and lower the production cost.

[0082] In other embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all made of glass. In this case, the optical imaging system 100 can withstand higher temperatures and has better optical performance.

[0083] In other embodiments, the first lens L1 is made of glass, while the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are made of plastic. The first lens closest to the object side is made of glass to better withstand the effects of the object-side ambient temperature. Meanwhile, the other lenses are made of plastic, which significantly reduces the weight of the optical imaging system 100 and reduces production costs.

[0084] In some embodiments, when the object-side surface and / or the image-side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are aspherical surfaces, the aspherical surfaces satisfy the following relationship:

[0085] Formula (1)

[0086] Wherein, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the object side or image side, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface (at the optical axis), k is the cone coefficient, and Ai is the i-th order aspheric coefficient of the object side or image side.

[0087] In some embodiments, the optical imaging system 100 further includes an aperture 10 located on the object side of the first lens element L1. Specifically, the aperture 10 can be located above the object-side surface S1, or it can be positioned between the object plane and the object-side surface S1, i.e., the aperture 10 does not directly contact the object-side surface S1. Positioning the aperture 10 on the object side of the first lens element L1 can impart a telecentric effect to the optical imaging system 100, thereby increasing the efficiency of image reception by the photosensitive element.

[0088] In some embodiments, the optical imaging system 100 further includes an infrared filter 30. The infrared filter 30 has a first surface 31 and a second surface 32. The infrared filter 30 is made of glass and is located between the fifth lens element L5 and the imaging surface 50. The infrared filter 30 can filter out infrared light, reduce ghost images, and provide some protection for the photosensitive element.

[0089] The term "ghost image" in the present invention refers to an additional image generated near the focal plane of an optical system due to reflection from the lens surface, which is generally darker in brightness and offset from the original image.

[0090] In some embodiments, the optical imaging system 100 satisfies the following conditional equation:

[0091] TTL / Imgh<2.05;

[0092] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and Imgh is half of the diagonal length of the effective pixel area of the optical imaging system on the imaging surface.

[0093] That is, TTL / Imgh can be any value less than 2.05, such as 0.1, 0.5, 0.8, 1.0, 1.2, 1.5, 1.6, 1.9, 2.0, etc.

[0094] When TTL / Imgh<2.05, it is conducive to the miniaturization of the optical imaging system.

[0095] In some embodiments, the optical imaging system 100 satisfies the following conditional equation:

[0096] TTL / f<0.95;

[0097] Wherein, f is the effective focal length of the optical imaging system, and TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0098] That is, TTL / f can be any value less than 0.95, such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 0.9, etc.

[0099] When TTL / f < 0.95, it is beneficial to the miniaturization of the optical imaging system.

[0100] In some embodiments, the optical imaging system 100 satisfies the following conditional expression:

[0101] 3.2 < TTL / T34 < 4.5;

[0102] Where, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis, and T34 is the air gap on the optical axis between the third lens and the fourth lens.

[0103] That is to say, TTL / T34 can be any value between 3.2 and 4.5, such as 3.3, 3.5, 3.8, 4.0, 4.2, 4.3, 4.4, etc.

[0104] When 3.2 < TTL / T34 < 4.5, it can effectively increase the light exit angle of the marginal field of view, thereby improving the relative brightness of the optical imaging system 100.

[0105] In some embodiments, the optical imaging system 100 satisfies the following conditional expression:

[0106] 0 < dist1 - dist2 < 0.015;

[0107] Where, dist1 is the optical distortion of the maximum field of view of the optical imaging system, and dist2 is the optical distortion in the narrow side direction of the effective pixel region of the imaging surface.

[0108] That is to say, dist1 - dist2 can be any value between 0 and 0.015, such as 0.001, 0.003, 0.005, 0.008, 0.01, 0.012, 0.014, etc.

[0109] When 0 < dist1 - dist2 < 0.015, it can effectively reduce the distortion of the overall imaging picture of the optical imaging system 100.

[0110] In some embodiments, the optical imaging system 100 satisfies the following conditional expression:

[0111] (R9 + R10) / (R9 - R10) < -50;

[0112] Where, R9 is the curvature radius of the object side surface of the fifth lens on the optical axis, and R10 is the curvature radius of the image side surface of the fifth lens on the optical axis according to

[0113] That is, (R9+R10) / (R9-R10) can be any value less than -50, such as -0.5, -2, -5, -10, -15, -20, -30, -40, -45, -49.9, etc.

[0114] When (R9+R10) / (R9-R10)<-50, the curvature radii of the object-side surface S5 and the image-side surface S6 of the third lens element L3 at the optical axis are more appropriate, which can reasonably increase the incident angle to meet the image height requirement of the optical imaging system, while reducing the sensitivity of the optical imaging system and improving assembly stability.

[0115] In some embodiments, the optical imaging system 100 satisfies the following conditional equation:

[0116] Imgh / tan(HFOV)>6;

[0117] Among them, Imgh is half of the diagonal length of the effective pixel area of the optical imaging system on the imaging surface, and HFOV is half of the maximum field of view of the optical imaging system 100, that is, HFOV is the diagonal field of view of the optical imaging system 100.

[0118] That is, Imgh / tan(HFOV) can be any value greater than 6, such as 6.1, 6.5, 7, 8, 9, 15, etc.

[0119] When Imgh / tan(HFOV)>6, it is beneficial to maintain the telephoto characteristics of the optical imaging system.

[0120] The optical imaging system 100 of the present invention is further described in detail below with reference to specific embodiments.

[0121] First embodiment

[0122] See Figure 1-1 and Figure 1-2 ,in Figure 1-1 is a schematic structural diagram of the optical imaging system 100 according to the first embodiment. Figure 1-2 From left to right are the spherical aberration, astigmatism and distortion curves of the first embodiment of the present invention. Figure 1-1 It can be seen that the optical imaging system 100 of this embodiment includes, from the object side to the image side, an aperture 10 with positive optical power, a first lens L1, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, an infrared filter 30, and an imaging surface 50.

[0123] The first lens L1 is made of plastic, and both its object-side surface S1 and image-side surface S2 are aspherical. The object-side surface S1 is convex near the optical axis and concave at the circumference, while the image-side surface S2 is convex near the optical axis and convex at the circumference.

[0124] The second lens L2 is made of plastic, and its object-side surface S3 and image-side surface S4 are both aspherical. The object-side surface S3 is convex near the optical axis and convex at the circumference, while the image-side surface S4 is concave near the optical axis and at the circumference.

[0125] The third lens L3 is made of plastic, and its object-side surface S5 and image-side surface S6 are both aspherical. Object-side surface S5 is concave near the optical axis and convex at the circumference, while image-side surface S6 is concave near the optical axis and concave at the circumference.

[0126] The fourth lens L4 is made of plastic, and its object-side surface S7 and image-side surface S8 are both aspherical. Object-side surface S7 is concave near the optical axis and convex at the circumference, while image-side surface S8 is convex near the optical axis and at the circumference.

[0127] The fifth lens element L5 is made of plastic, with both its object-side surface S9 and image-side surface S10 being aspherical. Object-side surface S9 is concave near the optical axis and along its circumference. Image-side surface S10 is concave near the optical axis and convex along its circumference.

[0128] In this embodiment, TTL=5.54, Imgh=2.77, TTL / Imgh=2.00; f=6.21, TTL / f=0.89; map2=0.28, map1=0.46, map2 / map1=0.620; T34=1.51, TTL / T34=3.67; dist1=0.014, dist2=0.009, dist1-dist2=0.005; R9=-3.46, R10=22.85, (R9+R10) / (R9-R10)=-0.74; HFOV=23.75, Imgh / tan(HFOV)=6.29.

[0129] In this embodiment, the optical imaging system 100 satisfies the conditions in Table 1 and Table 2 below.

[0130]

[0131]

[0132]

[0133] In Table 1, FNO is the aperture number of the optical imaging system, and FOV is the field of view angle of the optical imaging system in the diagonal direction.

[0134] Table 2 shows the aspheric surface data of the first embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4th to 20th order aspheric surface coefficients of each surface.

[0135] Depend on Figure 1-2 It can be seen that the optical imaging system 100 of the present invention has a relatively high resolution while meeting the requirements of miniaturization.

[0136] Second embodiment

[0137] See Figure 2-1 and Figure 2-2 ,in Figure 2-1 is a structural diagram of an optical imaging system 100 according to a second embodiment. Figure 2-2 From left to right are the spherical aberration, astigmatism and distortion curves of the second embodiment of the present invention. Figure 2-1 It can be seen that the optical imaging system 100 of this embodiment includes, from the object side to the image side, an aperture 10 with positive optical power, a first lens L1, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, an infrared filter 30, and an imaging surface 50.

[0138] The first lens L1 is made of plastic, and both its object-side surface S1 and image-side surface S2 are aspherical. The object-side surface S1 is convex near the optical axis and concave at the circumference, while the image-side surface S2 is convex near the optical axis and convex at the circumference.

[0139] The second lens L2 is made of plastic, and its object-side surface S3 and image-side surface S4 are both aspherical. The object-side surface S3 is convex near the optical axis and convex at the circumference, while the image-side surface S4 is concave near the optical axis and at the circumference.

[0140] The third lens L3 is made of plastic, and its object-side surface S5 and image-side surface S6 are both aspherical. Object-side surface S5 is concave near the optical axis and convex at the circumference, while image-side surface S6 is convex near the optical axis and concave at the circumference.

[0141] The fourth lens L4 is made of plastic, with both its object-side surface S7 and image-side surface S8 being aspherical. Object-side surface S7 is concave near the optical axis and concave around the periphery, while image-side surface S8 is convex near the optical axis and around the periphery.

[0142] The fifth lens element L5 is made of plastic, with both its object-side surface S9 and image-side surface S10 being aspherical. Object-side surface S9 is concave near the optical axis and along its circumference. Image-side surface S10 is convex near the optical axis and concave along its circumference.

[0143] In this embodiment, TTL=5.55, Imgh=2.77, TTL / Imgh=2.00; f=6.22, TTL / f=0.89; map2=0.28, map1=0.44, map2 / map1=0.633; T34=1.58, TTL / T34=3.51; dist1=0.014, dist2=0.009, dist1-dist2=0.005; R9=-3.05, R10=-885, (R9+R10) / (R9-R10)=-1.01; HFOV=23.75, Imgh / tan(HFOV)=6.29.

[0144] In this embodiment, the optical imaging system 100 satisfies the conditions in Table 3 and Table 4 below.

[0145]

[0146]

[0147] In Table 3, FNO is the aperture number of the optical imaging system, and FOV is the field of view angle of the optical imaging system in the diagonal direction.

[0148] Table 4 shows the aspheric surface data of the second embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4th to 20th order aspheric surface coefficients of each surface.

[0149] Depend on Figure 2-2 It can be seen that the optical imaging system 100 of the present invention has a high resolution while meeting the requirements of miniaturization.

[0150] Third embodiment

[0151] See Figure 3-1 and Figure 3-2 ,in Figure 3-1 is a schematic structural diagram of an optical imaging system 100 according to a third embodiment. Figure 3-2 From left to right are the spherical aberration, astigmatism and distortion curves of the third embodiment of the present invention. Figure 3-1 It can be seen that the optical imaging system 100 of this embodiment includes, from the object side to the image side, an aperture 10 with positive optical power, a first lens L1, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, an infrared filter 30, and an imaging surface 50.

[0152] The first lens L1 is made of plastic, and its object-side surface S1 and image-side surface S2 are both aspherical. The object-side surface S1 is convex near the optical axis and concave at the circumference, while the image-side surface S2 is convex near the optical axis and at the circumference.

[0153] The second lens L2 is made of plastic, and its object-side surface S3 and image-side surface S4 are both aspherical. The object-side surface S3 is concave near the optical axis and convex at the circumference, while the image-side surface S4 is concave near the optical axis and at the circumference.

[0154] The third lens L3 is made of plastic, and its object-side surface S5 and image-side surface S6 are both aspherical. Object-side surface S5 is concave near the optical axis and convex at the circumference, while image-side surface S6 is concave near the optical axis and at the circumference.

[0155] The fourth lens L4 is made of plastic, with both its object-side surface S7 and image-side surface S8 being aspherical. Object-side surface S7 is convex near the optical axis and concave at its circumference, while image-side surface S8 is convex near the optical axis and at its circumference.

[0156] The fifth lens element L5 is made of plastic, with both its object-side surface S9 and image-side surface S10 being aspherical. Object-side surface S9 is concave near the optical axis and along its circumference. Image-side surface S10 is convex near the optical axis and concave along its circumference.

[0157] In this embodiment, TTL=5.55, Imgh=2.77, TTL / Imgh=2.00; f=6.20, TTL / f=0.9; map2=0.26, map1=0.46, map2 / map1=0.574; T34=1.43, TTL / T34=3.88; dist1=0.015, dist2=0.003, dist1-dist2=0.012; R9=-4.03, R10=-94.48, (R9+R10) / (R9-R10)=-1.09; HFOV=23.75, Imgh / tan(HFOV)=6.29.

[0158] In this embodiment, the optical imaging system 100 satisfies the conditions of Table 5 and Table 6 below.

[0159]

[0160]

[0161] In Table 5, FNO is the aperture number of the optical imaging system, and FOV is the field of view angle of the optical imaging system in the diagonal direction.

[0162] Table 6 shows the aspheric surface data of the third embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4th to 20th order aspheric surface coefficients of each surface.

[0163] Depend on Figure 3-2 It can be seen that the optical imaging system 100 of the present invention has a high resolution while meeting the requirements of miniaturization.

[0164] Fourth embodiment

[0165] See Figure 4-1 and Figure 4-2 ,in Figure 4-1 is a schematic structural diagram of an optical imaging system 100 according to a fourth embodiment. Figure 4-2 From left to right are the spherical aberration, astigmatism and distortion curves of the fourth embodiment of the present invention. Figure 4-1 It can be seen that the optical imaging system 100 of this embodiment includes, from the object side to the image side, an aperture 10 with positive optical power, a first lens L1, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, an infrared filter 30, and an imaging surface 50.

[0166] The first lens L1 is made of plastic, and both its object-side surface S1 and image-side surface S2 are aspherical. The object-side surface S1 is convex near the optical axis and concave at the circumference, while the image-side surface S2 is concave near the optical axis and convex at the circumference.

[0167] The second lens L2 is made of plastic, and its object-side surface S3 and image-side surface S4 are both aspherical. The object-side surface S3 is convex near the optical axis and around the circumference, while the image-side surface S4 is concave near the optical axis and around the circumference.

[0168] The third lens L3 is made of plastic, and its object-side surface S5 and image-side surface S6 are both aspherical. Object-side surface S5 is concave near the optical axis and convex at the circumference, while image-side surface S6 is convex near the optical axis and concave at the circumference.

[0169] The fourth lens L4 is made of plastic, with both its object-side surface S7 and image-side surface S8 being aspherical. Object-side surface S7 is concave near the optical axis and around its circumference, while image-side surface S8 is convex near the optical axis and around its circumference.

[0170] The fifth lens element L5 is made of plastic, with both its object-side surface S9 and image-side surface S10 being aspherical. Object-side surface S9 is concave near the optical axis and convex at its circumference. Image-side surface S10 is concave near the optical axis and convex at its circumference.

[0171] In this embodiment, TTL=5.55, Imgh=2.77, TTL / Imgh=2.00; f=6.20, TTL / f=0.9; map2=0.28, map1=0.48, map2 / map1=0.590; T34=1.39, TTL / T34=4.00; dist1=0.016, dist2=0.006, dist1-dist2=0.010; R9=-5.71, R10=9.16, (R9+R10) / (R9-R10)=-0.23; HFOV=23.75, Imgh / tan(HFOV)=6.29.

[0172] In this embodiment, the optical imaging system 100 satisfies the conditions of Table 7 and Table 8 below.

[0173]

[0174]

[0175] In Table 7, FNO is the aperture number of the optical imaging system, and FOV is the field of view angle of the optical imaging system in the diagonal direction.

[0176] Table 8 shows the aspheric surface data of the fourth embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4th to 20th order aspheric surface coefficients of each surface.

[0177] Depend on Figure 4-2 It can be seen that the optical imaging system 100 of the present invention has a high resolution while meeting the requirements of miniaturization.

[0178] Fifth embodiment

[0179] See Figure 5-1 and Figure 5-2 ,in Figure 5-1 is a schematic structural diagram of an optical imaging system 100 according to a fifth embodiment. Figure 5-2 From left to right are the spherical aberration, astigmatism and distortion curves of the fifth embodiment of the present invention. Figure 5-1 It can be seen that the optical imaging system 100 of this embodiment includes, from the object side to the image side, an aperture 10 with positive optical power, a first lens L1, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with negative optical power, a fifth lens L5 with negative optical power, an infrared filter 30, and an imaging surface 50.

[0180] The first lens L1 is made of plastic, and its object-side surface S1 and image-side surface S2 are both aspherical. The object-side surface S1 is convex near the optical axis and concave at the circumference, while the image-side surface S2 is convex near the optical axis and at the circumference.

[0181] The second lens L2 is made of plastic, and its object-side surface S3 and image-side surface S4 are both aspherical. The object-side surface S3 is convex near the optical axis and around the circumference, while the image-side surface S4 is concave near the optical axis and around the circumference.

[0182] The third lens L3 is made of plastic, and its object-side surface S5 and image-side surface S6 are both aspherical. Object-side surface S5 is concave near the optical axis and convex at the circumference, while image-side surface S6 is concave near the optical axis and at the circumference.

[0183] The fourth lens L4 is made of plastic, and its object-side surface S7 and image-side surface S8 are both aspherical. Object-side surface S7 is concave near the optical axis and convex at the circumference, while image-side surface S8 is convex near the optical axis and at the circumference.

[0184] The fifth lens element L5 is made of plastic, with both its object-side surface S9 and image-side surface S10 being aspherical. Object-side surface S9 is concave near the optical axis and along its circumference. Image-side surface S10 is convex near the optical axis and concave along its circumference.

[0185] In this embodiment, TTL=5.55, Imgh=2.77, TTL / Imgh=2.00; f=6.20, TTL / f=0.9; map2=0.27, map1=0.42, map2 / map1=0.639; T34=1.50, TTL / T34=3.7; dist1=0.019, dist2=0.009, dist1-dist2=0.009; R9=-4.58, R10=-8.86, (R9+R10) / (R9-R10)=-3.14; HFOV=23.70, Imgh / tan(HFOV)=6.31.

[0186] In this embodiment, the optical imaging system 100 satisfies the conditions of Table 9 and Table 10 below.

[0187]

[0188]

[0189]

[0190] In Table 9, FNO is the aperture number of the optical imaging system, and FOV is the field of view angle of the optical imaging system in the diagonal direction.

[0191] Table 10 shows the aspheric surface data of the fifth embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4th to 20th order aspheric surface coefficients of each surface.

[0192] Depend on Figure 5-2 It can be seen that the optical imaging system 100 of the present invention has a high resolution while meeting the requirements of miniaturization.

[0193] Sixth embodiment

[0194] See Figure 6-1 and Figure 6-2 ,in Figure 6-1 is a schematic structural diagram of an optical imaging system 100 according to a sixth embodiment. Figure 6-2 From left to right are the spherical aberration, astigmatism and distortion curves of the sixth embodiment of the present invention. Figure 6-1It can be seen that the optical imaging system 100 of this embodiment includes, from the object side to the image side, an aperture 10 with positive optical power, a first lens element L1, a second lens element L2 with negative optical power, a third lens element L3 with negative optical power, a fourth lens element L4 with negative optical power, a fifth lens element L5 with positive optical power, an infrared filter 30, and an imaging surface 50.

[0195] The first lens L1 is made of plastic, and its object-side surface S1 and image-side surface S2 are both aspherical. The object-side surface S1 is convex near the optical axis and concave at the circumference, while the image-side surface S2 is convex near the optical axis and at the circumference.

[0196] The second lens L2 is made of plastic, and its object-side surface S3 and image-side surface S4 are both aspherical. The object-side surface S3 is convex near the optical axis and around the circumference, while the image-side surface S4 is concave near the optical axis and around the circumference.

[0197] The third lens L3 is made of plastic, and its object-side surface S5 and image-side surface S6 are both aspherical. Object-side surface S5 is concave near the optical axis and convex at the circumference, while image-side surface S6 is concave near the optical axis and at the circumference.

[0198] The fourth lens L4 is made of plastic, with both its object-side surface S7 and image-side surface S8 being aspherical. Object-side surface S7 is concave near the optical axis and around its circumference, while image-side surface S8 is convex near the optical axis and around its circumference.

[0199] The fifth lens element L5 is made of plastic, with both its object-side surface S9 and image-side surface S10 being aspherical. Object-side surface S9 is convex near the optical axis and concave along its circumference. Image-side surface S10 is concave near the optical axis and along its circumference.

[0200] In this embodiment, TTL=5.55, Imgh=2.77, TTL / Imgh=2.00; f=6.20, TTL / f=0.9; map2=0.29, map1=0.50, map2 / map1=0.570; T34=1.50, TTL / T34=3.7; dist1=0.018, dist2=0.012, dist1-dist2=0.006; R9=13.13, R10=14, (R9+R10) / (R9-R10)=-31.13; HFOV=23.70, Imgh / tan(HFOV)=6.31.

[0201] In this embodiment, the optical imaging system 100 satisfies the conditions of Table 11 and Table 12 below.

[0202]

[0203]

[0204] In Table 11, FNO is the aperture number of the optical imaging system, and FOV is the field of view angle of the optical imaging system in the diagonal direction.

[0205] Table 12 shows the aspheric surface data of the sixth embodiment, where k is the conic coefficient of each surface, and A4-A20 are the 4th to 20th order aspheric surface coefficients of each surface.

[0206] Depend on Figure 6-2 It can be seen that the optical imaging system 100 of the present invention has a high resolution while meeting the requirements of miniaturization.

[0207] like Figure 7 As shown, the present invention further provides an imaging device 200 comprising the optical imaging system 100 and a photosensitive element 210 of the present invention. The photosensitive element 210 is located on the image side of the optical imaging system 100.

[0208] The photosensitive element 210 of the present invention may be a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) sensor.

[0209] For other features of the imaging device 200 , please refer to the above description and will not be repeated here.

[0210] The imaging device 200 of the present invention has a large amount of light input and high relative brightness while ensuring miniaturization, and has high imaging quality in low-light environments.

[0211] like Figure 8 As shown, the present invention further provides an electronic device 300 , which includes a device body 310 and the imaging device 200 of the present invention. The orientation device 200 is mounted on the device body 310 .

[0212] The electronic device 300 of the present invention has a large amount of light intake and high relative brightness while ensuring miniaturization, and has high imaging quality in low-light environments.

[0213] The electronic device 300 of the present invention includes but is not limited to computers, laptops, tablet computers, mobile phones, cameras, smart bracelets, smart watches, smart glasses, etc.

[0214] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An optical imaging system, characterized in that: The optical imaging system is composed of a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The optical imaging system includes, from the object side to the image side, the following: a first lens having positive optical power; a second lens having negative optical power; a third lens having negative optical power; a fourth lens element having optical power, wherein the image-side surface of the fourth lens element is convex near the optical axis and at the circumference; and a fifth lens having optical power, wherein the fifth lens is an aspherical lens; Wherein, the optical imaging system satisfies the conditional formula: 0.5 <map2 / map1; Among them, map2 is the light aperture of the light on the image side of the fifth lens when the field of view angle in the diagonal direction of the optical imaging system is the largest; map1 is the light aperture of the central field of view light on the image side of the fifth lens.

2. The optical imaging system according to claim 1, wherein: The first lens, the second lens, the third lens and the fourth lens are all aspherical lenses.

3. The optical imaging system according to claim 1, wherein: The object side surface of the first lens is convex near the optical axis and concave at the circumference; the image side surface is convex at the circumference.

4. The optical imaging system according to claim 1, wherein: The object side of the second lens is convex at the circumference; the image side is concave near the optical axis and at the circumference.

5. The optical imaging system according to claim 1, wherein: The object side surface of the third lens is concave near the optical axis and convex at the circumference; the image side surface is concave at the circumference.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the condition: 0.5 <map2 / map1≤0.639。 7. The optical imaging system according to claim 1, wherein: The optical imaging system further includes an infrared filter, which is located between the fifth lens and the imaging plane.

8. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: TTL / Imgh<2.05; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and Imgh is half of the diagonal length of the effective pixel area of the optical imaging system on the imaging surface.

9. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 0.89≤TTL / f<0.95; Wherein, f is the effective focal length of the optical imaging system, and TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

10. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 3.2 <TTL / T34<4.5; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

11. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 0 <dist1-dist2<0.015; Among them, dist1 is the optical distortion of the maximum field of view of the optical imaging system, and dist2 is the optical distortion in the narrow side direction of the effective pixel area of the imaging surface.

12. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: -31.13≤(R9+R10) / (R9-R10)≤-0.23; Wherein, R9 is the curvature radius of the object side surface of the fifth lens at the optical axis, and R10 is the curvature radius of the image side surface of the fifth lens at the optical axis.

13. The optical imaging system according to any one of claims 1 to 12, characterized in that: The optical imaging system satisfies the following conditional formula: Imgh / tan(HFOV)>6; Among them, Imgh is half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system, and HFOV is half of the maximum field of view of the optical imaging system.

14. An imaging device, characterized in that: include: The optical imaging system according to any one of claims 1 to 13; and A photosensitive element is located on the image side of the optical imaging system.

15. An electronic device, characterized in that: include: Equipment body and; The imaging device according to claim 14, wherein the imaging device is mounted on the device body.

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