CN211263921U - Optical imaging system, imaging device and electronic equipment - Google Patents

Abstract

The utility model provides an optical imaging system, which sequentially comprises: a first lens with optical power; a second lens with positive optical power; a third lens with positive optical power; The fourth lens with optic power; the fifth lens with optical power; the sixth lens with positive power; and the seventh lens with negative power; wherein, the optical imaging system satisfies the following relation: 1<SD12 /SD21<1.4; wherein, SD12 is the effective semi-aperture of the image side of the first lens; SD21 is the effective semi-aperture of the object side of the second lens. The optical imaging system of the utility model is small in size, has a large amount of incoming light, can improve the shooting conditions in dark light, and has good imaging quality in shooting under dark light conditions. The utility model also provides an imaging device and an electronic device.

Description

Optical imaging system, imaging device and electronic equipment

technical field

The utility model relates to an optical imaging technology, in particular to an optical imaging system, an imaging device and electronic equipment.

Background technique

With the continuous development of camera-related technologies, taking pictures has become a standard function of smart electronic products, and consumers' demand for electronic products with ideal picture-taking effects is also increasing. Under the application of optimized software algorithm, it has a good photo effect and brings an excellent experience to consumers. However, with the improvement of performance and size of common photosensitive elements such as Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor (CMOS), the number of pixels of the photosensitive element increases and the number of pixels increases. The reduction in size puts forward higher requirements for the miniaturization characteristics of imaging lenses, and for environments with insufficient light, such as night, cloudy and rainy days, starry sky, etc., the requirements for the amount of light entering the lens are higher. At the same time, in order to ensure the high imaging quality of the optical lens, more lenses are needed to achieve this, which will inevitably bring more difficulties to the miniaturization design of the lens. Existing optical imaging systems, while satisfying miniaturization, are difficult to ensure high imaging quality in various complex environments.

Utility model content

In view of this, the present invention provides an optical imaging system, which is small in size, has a large amount of incoming light, and can ensure good imaging quality even in a dark environment.

It is also necessary to provide an imaging device using the above-mentioned optical imaging system.

In addition, it is also necessary to provide an electronic device using the above-mentioned alignment device.

An optical imaging system, which sequentially includes from the object side to the image side:

a first lens having optical power;

a second lens having positive optical power;

a third lens having positive optical power;

a fourth lens having optical power;

a fifth lens having optical power;

a sixth lens having positive power; and

a seventh lens with negative refractive power;

Wherein, the optical imaging system satisfies the following relationship:

1<SD12/SD21<1.4;

Wherein, SD12 is the effective semi-aperture of the image side of the first lens; SD21 is the effective semi-aperture of the object side of the second lens.

When 1<SD12/SD21<1.4, the size of the front part of the optical imaging system can be effectively reduced.

Wherein, the object side surface and the image side surface of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspherical surfaces. The use of aspherical lenses is beneficial for concentrating light and imaging. It can be easily made into shapes other than spherical surface, more control variables can be obtained, and the advantages of good imaging can be obtained with fewer lenses, thereby reducing the number of lenses and satisfying miniaturization.

Wherein, the object side near the optical axis of the first lens is concave, and the image side near the optical axis is convex. This reduces the angle of incidence of the light.

Wherein, the object side near the optical axis of the second lens is convex, and the image side near the optical axis is concave. It is used with the first lens to correct the edge chromatic aberration of the optical imaging system.

Wherein, the circumference of the object side surface of the third lens is a convex surface; the near optical axis and the circumference of the image side surface are convex surfaces. In this way, the chromatic aberration and spherical aberration of the system can be further corrected.

Wherein, the object side of the fourth lens is concave at the near-optical axis, and the circumference is convex; the image side is convex at the near-optical axis, and the circumference is concave. In this way, the distance between the third lens and the fourth lens can be reduced, and the effective aperture of the fourth lens can be reduced, thereby reducing the molding difficulty of the optical imaging system.

Wherein, the object side near optical axis and the circumference of the fifth lens are concave; the image side circumference is convex. This reduces the aberration of the light at the edge of the field of view and concentrates the light at the edge as much as possible.

Wherein, the object side near optical axis and the circumference of the sixth lens are both convex surfaces; the image side circumference is concave. In this way, the rays of the inner field of view can be concentrated and the incident angle of the chief ray can be reduced.

Wherein, the object side of the seventh lens is convex at the near optical axis, and the circumference is concave; the image side is concave at the near optical axis, and the circumference is convex. It is used to weaken spherical aberration, coma aberration and astigmatism generated by light passing through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens.

Wherein, the optical imaging system further includes an infrared filter, and the infrared filter is located between the seventh lens and the imaging surface. The infrared filter can filter out the light in the infrared band, reduce some ghost image stray light, and also play a certain role in protecting the photosensitive element.

Wherein, the optical imaging system further includes a diaphragm, and the diaphragm is located between the second lens and the third lens. The diaphragm is beneficial to balance the spherical aberration in the sagittal direction and improve the MTF performance of the optical imaging system.

Wherein, the optical imaging system satisfies the following conditional formula:

TTL/Imgh<1.3;

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 on the imaging surface.

When TTL/Imgh<1.3, the optical imaging system is more miniaturized.

Wherein, the optical imaging system satisfies the following conditional formula:

2<f/R14<4;

Wherein, f is the effective focal length of the optical imaging system, and R14 is the curvature radius of the image side surface of the seventh lens.

When 2<f/R14<4, it can better match the chief ray angle of the inner field of view of the photosensitive element.

Wherein, the optical imaging system satisfies the following conditional formula:

Fno<2;

Wherein, Fno is the aperture number of the optical imaging system.

When Fno<2, the optical imaging system can meet the requirements of miniaturization, and at the same time, it can ensure a large aperture, so that the optical imaging system has enough light input, so that the captured images are clearer, and high-quality night scenes, starry sky and other light brightness can be captured. Large object space scene.

Wherein, the optical imaging system satisfies the following conditional formula:

TTL/f<1.6;

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

When TTL/f<1.6, the optical imaging system can meet the miniaturization requirements.

Wherein, the optical imaging system satisfies the following conditional formula:

1<(R13+R14)/(R13-R14)<4;

Wherein, R13 is the radius of curvature of the object side of the seventh lens, and R14 is the radius of curvature of the image side of the seventh lens.

When 1<(R13+R14)/(R13-R14)<4, the curvature radius of the object side of the third lens and the curvature radius of the image side S6 are more suitable, and the incident angle can be reasonably increased to meet the image height of the optical imaging system requirements, while reducing the system sensitivity and improving the stability of the optical imaging system assembly.

Wherein, the optical imaging system satisfies the following conditional formula:

0.1＜T45/CT5＜1;

Wherein, T45 is the distance between the fourth lens and the fifth lens on the optical axis, and CT5 is the central thickness of the fifth lens.

When 0.1<T45/CT5<1, it is favorable for the structural arrangement of the optical imaging system.

0＜T34/CT4＜0.82;

Wherein, T34 is the distance between the third lens and the fourth lens on the optical axis, and CT4 is the central thickness of the fourth lens.

When 0<T34/CT4<0.82, it is beneficial to reduce the deflection angle of light and reduce the sensitivity of the optical imaging system 100 .

The utility model also provides an imaging device, which includes:

the above-mentioned optical imaging system; and

A photosensitive element, which is located on the image side of the optical imaging system.

The utility model also provides an electronic device, which includes:

The main body of the equipment and;

In the above-mentioned imaging device, the imaging device is installed on the main body of the device.

Therefore, the optical imaging system of the present invention has a small volume and a large amount of light through the design of the focal power and surface shape of the seven lenses, which can improve the shooting conditions in dark light, and shoot under dark light conditions. Has good imaging quality.

Description of drawings

In order to illustrate the structural features and effects of the present utility model more clearly, it will be described in detail below with reference to the accompanying drawings and specific embodiments.

1-1 is a schematic structural diagram of an optical imaging system according to the first embodiment of the present invention.

1-2 are graphs of spherical aberration, astigmatism and distortion of the optical imaging system according to the first embodiment of the present invention, from left to right.

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

FIG. 2-2 is a graph showing spherical aberration, astigmatism and distortion of the optical imaging system according to the second embodiment of the present invention, from left to right.

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

FIG. 3-2 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system according to the third embodiment of the present invention, from left to right.

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

Figure 4-2 is a graph of spherical aberration, astigmatism and distortion of the optical imaging system according to the fourth embodiment of the present invention, from left to right.

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

FIG. 5-2 is the spherical aberration, astigmatism and distortion curves of the optical imaging system according to the fifth embodiment of the present invention, from left to right.

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

FIG. 6-2 is a graph showing spherical aberration, astigmatism and distortion of the optical imaging system according to the sixth embodiment of the present invention, from left to right.

FIG. 7 is a schematic structural diagram of an imaging device according to an embodiment of the present invention.

8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Please refer to Fig. 1-1, Fig. 2-1, Fig. 3-1, Fig. 4-1, Fig. 5-1 and Fig. 6-1, the optical imaging system 100 of the embodiment of the present invention is applied to mobile phones, drones, etc. A camera of a miniature digital product, from the object side to the image side, it sequentially includes a first lens L1 with refractive power, a second lens L2 with positive refractive power, a third lens L3 with positive refractive power, and a The fourth lens L4, the fifth lens L5 having refractive power, the sixth lens L6 having positive refractive power, and the seventh lens L7 having negative refractive power. The optical imaging system satisfies the following relation:

1<SD12/SD21<1.4;

Wherein, SD12 is the effective semi-aperture of the image side of the first lens L1; SD21 is the effective semi-aperture of the object side of the second lens L2.

When 1<SD12/SD21<1.4, the size of the front of the optical imaging system 100 can be effectively reduced.

The head size of the optical imaging system 100 of the present invention is small, has a larger light-passing aperture, and has a larger amount of incoming light, which can improve the shooting conditions in dark light, and has good imaging quality in shooting under dark light conditions.

Optionally, the first lens L1 is made of plastic or glass, and has an object side S1 and an image side S2. Both the object side surface S1 and the image side surface S2 are aspherical surfaces. The object side surface S1 near the optical axis is a concave surface, and the circumference can be a convex surface or a concave surface. Like the side S2 near the optical axis is convex, and the circumference can be convex or concave. The first lens L1 may have positive refractive power or negative refractive power. The first lens L1 adopts an aspherical lens, which is favorable for converging light and imaging. It can be easily made into shapes other than spherical surface, more control variables can be obtained, and the advantages of good imaging can be obtained with fewer lenses, thereby reducing the number of lenses and satisfying miniaturization. The surface shapes of the object side S1 and the image side S2 of the first lens L1 are designed to reduce the incident angle of light.

Optionally, the second lens L2 is made of plastic or glass, and has an object side S3 and an image side S4. Both the object side surface S3 and the image side surface S4 are aspherical surfaces. The object side surface S3 near the optical axis is a convex surface, and the circumference can be a convex surface or a concave surface. Like the side S4, the near optical axis is concave, and the circumference can be convex or concave. The second lens L2 adopts an aspherical lens, which can be easily made into shapes other than spherical to obtain more control variables, which is beneficial to reduce aberrations and obtain the advantages of good imaging with a small number of lenses; thus reducing the number of lenses to meet the needs of small change. The surface shapes of the object side S3 and the image side S4 of the second lens L2 are designed to cooperate with the first lens to correct the edge chromatic aberration of the optical imaging system 100 .

Optionally, the third lens L3 is made of plastic or glass, and has an object side S5 and an image side S6. Both the object side surface S5 and the image side surface S6 are aspherical surfaces. The object side surface S5 near the optical axis can be convex or concave, and the circumference is convex. Like the side S6, the near optical axis and the circumference are convex. The third lens L3 can effectively reduce the field curvature and distortion of the system and improve the imaging quality. The third lens adopts an aspherical lens, which can be easily made into shapes other than spherical, and can obtain more control variables, which is beneficial to reduce aberrations and obtain the advantages of good imaging with a small number of lenses; thus reducing the number of lenses to meet the requirements of miniaturization . The surface design of the object side S5 and the image side S6 of the third lens L3 can further correct the chromatic aberration and spherical aberration of the system.

Optionally, the fourth lens L4 is made of plastic or glass, and has an object side surface S7 and an image side surface S8. Both the object side surface S7 and the image side surface S8 are aspherical. The object side S7 is a concave surface near the optical axis, and a convex surface at the circumference. Like the side S8, the near-optical axis is convex, and the circumference is concave. The fourth lens L4 may have positive refractive power or negative refractive power. The aspherical lens of the lens can be easily made into a shape other than the spherical surface to obtain more control variables, which is beneficial to reduce aberrations and obtain the advantages of good imaging with fewer lenses; thus reducing the number of lenses to meet miniaturization. The surface design of the object side S7 and the image side S8 of the fourth lens L4 can reduce the distance between the third lens L3 and the fourth lens L4, and reduce the effective aperture of the fourth lens L4, thereby reducing the molding of the optical imaging system 100. difficulty.

Optionally, the fifth lens L5 is made of plastic or glass, and has an object side S9 and an image side S10. Both the object side surface S9 and the image side surface S10 are aspherical surfaces. The object side surface S9 is concave at the near optical axis and at the circumference. Like the side S10 near the optical axis, it can be convex or concave, and the circumference is convex. The fifth lens L5 may have positive refractive power or negative refractive power. The aspherical lens of the lens can be easily made into a shape other than the spherical surface to obtain more control variables, which is beneficial to reduce aberrations and obtain the advantages of good imaging with fewer lenses; thus reducing the number of lenses to meet miniaturization. The surface design of the object side S9 and the image side S10 of the fifth lens L5 can reduce the aberration of the light at the edge of the field of view, and concentrate the light at the edge as much as possible.

Optionally, the sixth lens L6 is made of plastic or glass, and has an object side surface S11 and an image side surface S12. Both the object side surface S11 and the image side surface S12 are aspherical surfaces. The object side surface S11 is convex at the near optical axis and at the circumference. Like the side surface S12 near the optical axis can be convex or concave, and the circumference is concave. The aspherical lens of the lens can be easily made into a shape other than the spherical surface to obtain more control variables, which is beneficial to reduce aberrations and obtain the advantages of good imaging with fewer lenses; thus reducing the number of lenses to meet miniaturization. The surface design of the object side S11 and the image side S12 of the sixth lens L6 can condense the light in the inner field of view and reduce the incident angle of the chief ray.

Optionally, the seventh lens L7 is made of plastic or glass, and has an object side surface S13 and an image side surface S14. Both the object side surface S13 and the image side surface S14 are aspherical surfaces. The object side surface S13 is a convex surface near the optical axis, and a concave surface at the circumference. Image side S14 is concave at the near optical axis, and convex at the circumference. The aspherical lens of the lens can be easily made into a shape other than the spherical surface to obtain more control variables, which is beneficial to reduce aberrations and obtain the advantages of good imaging with fewer lenses; thus reducing the number of lenses to meet miniaturization. The surface shapes of the object side S13 and the image side S14 of the seventh lens L7 are designed to weaken the light after passing through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 The resulting spherical aberration, coma, and astigmatism.

In some embodiments, the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 and the seventh lens L7 are all made of plastic. At this time, the weight of the optical imaging system 100 can be reduced and the production cost can be reduced.

In other embodiments, the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 and the seventh lens L7 are all made of glass. At this time, the optical imaging system 100 can withstand higher temperature and has better optical performance.

In other embodiments, the first lens L1 is made of glass, and the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 and the seventh lens L7 are made of plastic. The first lens closest to the object side is made of glass material, which can better withstand the influence of the ambient temperature on the object side. At the same time, the other lenses are made of plastic material, which can reduce the weight of the optical imaging system 100 and the production cost. .

Optionally, the optical imaging system 100 further includes a diaphragm 10, and the diaphragm 10 is located between the second lens L2 and the third lens L3. The diaphragm is beneficial to balance the spherical aberration in the sagittal direction and improve the MTF (Modulation Transfer Function, modulation transfer function) performance of the optical imaging system 100 .

Optionally, the optical imaging system 100 further includes an infrared filter 30 . The infrared filter has a first side 31 and a second side 32. The infrared filter 30 is made of glass and is located between the seventh lens L7 and the imaging surface 50 . The infrared filter 30 can filter out the light in the infrared band, reduce some ghost image stray light, and can also play a certain protective role on the photosensitive element.

In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

TTL/Imgh<1.3;

Wherein, TTL is the distance from the object side S1 of the first lens L1 to the imaging surface 50 of the optical imaging system on the optical axis, and Imgh is half of the diagonal length of the effective pixel area on the imaging surface 50 .

That is, TTL/Imgh can be any value less than 1.3, such as 0.1, 0.2, 0.5, 0.7, 0.9, 1.1, 1.2, 1.29, and so on.

When TTL/Imgh<1.3, the optical imaging system is more miniaturized.

In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

2<f/R14<4;

Wherein, f is the effective focal length of the optical imaging system 100, and R14 is the curvature radius of the image side surface S14 of the seventh lens L7.

That is, f/R14 can be any value between 2 and 4, such as 2.1, 2.5, 2.8, 3.0, 3.2, 3.6, 3.9, etc.

When 2<f/R14<4, it can better match the chief ray angle of the inner field of view of the photosensitive element.

In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

Fno<2;

Wherein, Fno is the aperture number of the optical imaging system 100 .

That is, Fno can be any value less than 2, such as 0.1, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.9, etc.

When Fno<2, the optical imaging system 100 can ensure a large aperture while satisfying miniaturization, so that the optical imaging system 100 can have enough light input, so that the captured image is clearer, and high-quality night scenes, starry sky and other lights can be captured. Object space scenes with low brightness.

In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

TTL/f<1.6;

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

That is, TTL/f can be any value less than 1.6, such as 0.1, 0.5, 0.6, 0.8, 1.0, 1.2, 1.5, and so on.

When TTL/f<1.6, the optical imaging system 100 can meet the miniaturization requirement.

In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

1<(R13+R14)/(R13-R14)<4;

Wherein, R13 is the radius of curvature of the object side of the seventh lens, and R14 is the radius of curvature of the image side of the seventh lens.

That is, (R13+R14)/(R13-R14) can be any value of 1 and 4, such as 1.1, 1.5, 2.1, 2.5, 3.0, 3.5, 3.9, and so on.

When 1<(R13+R14)/(R13-R14)<4, the curvature radius of the object side surface S5 of the third lens L3 and the curvature radius of the image side surface S6 are more suitable, and the incident angle can be reasonably increased to meet the requirements of the optical imaging system. 100 image high requirements, while reducing system sensitivity and improving the stability of optical imaging system assembly.

In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

0.1＜T45/CT5＜1;

Wherein, T45 is the distance between the fourth lens L4 and the fifth lens L5 on the optical axis, and CT5 is the central thickness of the fifth lens L5.

That is, T45/CT5 can be any value between 0.1 and 1, such as 0.11, 0.3, 0.5, 0.7, 0.8, 0.85, 0.9, 0.99, etc.

When 0.1<T45/CT5<1, the structural arrangement of the optical imaging system 100 is favorable.

In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

0＜T34/CT4＜0.82;

Wherein, T34 is the distance between the third lens L3 and the fourth lens L4 on the optical axis, and CT4 is the center thickness of the fourth lens L4.

That is, T34/CT4 can be any value between 0 and 0.82, such as 0.01, 0.11, 0.3, 0.5, 0.7, 0.8, etc.

When 0<T34/CT4<0.82, it is beneficial to reduce the deflection angle of light and reduce the sensitivity of the optical imaging system.

The optical imaging system 100 of the present invention will be described in further detail below with reference to specific embodiments.

first embodiment

Please refer to FIGS. 1-1 and 1-2, wherein FIG. 1-1 is a schematic structural diagram of the optical imaging system 100 according to the first embodiment, and FIG. 1-2 is the spherical aberration of the first embodiment of the present invention from left to right. , astigmatism and distortion curves. It can be seen from FIG. 1-1 that the optical imaging system 100 of this embodiment sequentially includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a diaphragm 10, and a positive optical power. The third lens L3 with power, the fourth lens L4 with negative power, the fifth lens L5 with negative power, the sixth lens L6 with positive power, the seventh lens L7 with negative power , the infrared filter 30 and the imaging surface 50 .

The first lens L1 is made of plastic material, and the object side surface S1 and the image side surface S2 are both aspherical. The object side S1 near the optical axis is concave, and the circumference is convex. Image side S2 is convex at the near optical axis, and concave at the circumference.

The second lens L2 is made of plastic material, and the object side surface S3 and the image side surface S4 are both aspherical. The object side surface S3 is a convex surface near the optical axis, and a concave surface at the circumference. The near optical axis of the side S4 is concave, and the circumference is concave.

The third lens L3 is made of plastic material, and the object side S5 and the image side S6 are both aspherical. The object side surface S5 is a convex surface near the optical axis and a convex surface at the circumference. Like the side S6, the near optical axis and the circumference are convex.

The fourth lens L4 is made of plastic material, and the object side surface S7 and the image side surface S8 are both aspherical. The object side S7 is a concave surface near the optical axis, and a convex surface at the circumference. Like the side S8, the near-optical axis is convex, and the circumference is concave.

The fifth lens L5 is made of plastic material, and the object side surface S9 and the image side surface S10 are both aspherical. The object side surface S9 is concave at the near optical axis and at the circumference. Like the side S10, the near-optical axis is convex, and the circumference is convex.

The sixth lens L6 is made of plastic material, and the object side surface S11 and the image side surface S12 are both aspherical. The object side surface S11 is convex at the near optical axis and at the circumference. Image side S12 is concave at the near optical axis, and concave at the circumference.

The seventh lens L7 is made of plastic material, and the object side surface S13 and the image side surface S14 are both aspherical. The object side surface S13 is a convex surface near the optical axis, and a concave surface at the circumference. Image side S14 is concave at the near optical axis, and convex at the circumference.

In this embodiment, TTL=6.88, Imgh=5.32, TTL/Imgh=1.29; f=4.38, R14=1.24, f/R14=3.53; FNO=1.88; SD12=1.85, SD21=1.51, SD12/SD21= 1.227; TTL/f=1.57; R13=2.73, R14=1.24, (R13+R14)/(R13-R14)=2.66; T45=0.52, CT5=0.71, T45/CT5=0.74; T34=0.14, CT4= 0.36, T34/CT4=0.38.

In this embodiment, the optical imaging system 100 satisfies the conditions of Table 1 and Table 2 below.

In Table 1, the FOV is the field angle of the optical imaging system 100 in the diagonal direction.

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

It can be seen from FIGS. 1-2 that the optical imaging system 100 of the present invention has higher pixels under the condition of miniaturization.

Second Embodiment

Please refer to FIGS. 2-1 and 2-2, wherein FIG. 2-1 is a schematic structural diagram of the optical imaging system 100 according to the second embodiment, and FIG. 2-2 is the spherical aberration of the second embodiment of the present invention from left to right. , astigmatism and distortion curves. It can be seen from FIG. 2-1 that the optical imaging system 100 of this embodiment sequentially includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a diaphragm 10, and a positive optical power. The third lens L3 with power, the fourth lens L4 with negative power, the fifth lens L5 with negative power, the sixth lens L6 with positive power, the seventh lens L7 with negative power , the infrared filter 30 and the imaging surface 50 .

The first lens L1 is made of plastic material, and the object side surface S1 and the image side surface S2 are both aspherical. The object side S1 near the optical axis is concave, and the circumference is convex. Image side S2 is convex at the near optical axis, and concave at the circumference.

The second lens L2 is made of plastic material, and the object side surface S3 and the image side surface S4 are both aspherical. The object side surface S3 is a convex surface near the optical axis and a convex surface at the circumference. Like the side S4, the near optical axis is concave, and the circumference is convex.

The third lens L3 is made of plastic material, and the object side S5 and the image side S6 are both aspherical. The object side surface S5 is concave near the optical axis, and the circumference is convex. Like the side S6, the near optical axis and the circumference are convex.

The fourth lens L4 is made of plastic material, and the object side surface S7 and the image side surface S8 are both aspherical. The object side S7 is a concave surface near the optical axis, and a convex surface at the circumference. Like the side S8, the near-optical axis is convex, and the circumference is concave.

The fifth lens L5 is made of plastic material, and the object side surface S9 and the image side surface S10 are both aspherical. The object side surface S9 is concave at the near optical axis and at the circumference. Like the side S10, the near-optical axis is convex, and the circumference is convex.

The sixth lens L6 is made of plastic material, and the object side surface S11 and the image side surface S12 are both aspherical. The object side surface S11 is convex at the near optical axis and at the circumference. Image side S12 is convex at the near optical axis, and concave at the circumference.

The seventh lens L7 is made of plastic material, and the object side surface S13 and the image side surface S14 are both aspherical. The object side surface S13 is a convex surface near the optical axis, and a concave surface at the circumference. Image side S14 is concave at the near optical axis, and convex at the circumference.

In this embodiment, TTL=6.88, Imgh=5.32, TTL/Imgh=1.29; f=4.38, R14=1.27, f/R14=3.45; FNO=1.88; SD12=1.60, SD21=1.37, SD12/SD21= 1.168; TTL/f=1.57; R13=2.64, R14=1.27, (R13+R14)/(R13-R14)=2.85; T45=0.56, CT5=0.65, T45/CT5=0.87; T34=0.13, CT4= 0.36, T34/CT4=0.37.

In this embodiment, the optical imaging system 100 satisfies the conditions of Table 3 and Table 4 below.

The FOV in Table 3 is the angle of view of the optical imaging system 100 in the diagonal direction.

Table 4 shows the aspherical surface data of the second embodiment, wherein k is the conic coefficient of each surface, and A4-A20 are the 4th-20th order aspherical surface coefficients of each surface.

It can be seen from FIG. 2-2 that the optical imaging system 100 of the present invention has higher pixels under the condition of miniaturization.

Third Embodiment

Please refer to FIGS. 3-1 and 3-2, wherein FIG. 3-1 is a schematic structural diagram of the optical imaging system 100 according to the third embodiment, and FIG. 3-2 is the spherical aberration of the third embodiment of the present invention from left to right. , astigmatism and distortion curves. It can be seen from FIG. 3-1 that the optical imaging system 100 of this embodiment sequentially includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a diaphragm 10, and a positive light The third lens L3 with power, the fourth lens L4 with negative power, the fifth lens L5 with negative power, the sixth lens L6 with positive power, the seventh lens L7 with negative power , the infrared filter 30 and the imaging surface 50 .

The first lens L1 is made of plastic material, and the object side surface S1 and the image side surface S2 are both aspherical. The object side S1 near the optical axis is concave, and the circumference is convex. Image side S2 is convex at the near optical axis, and concave at the circumference.

The second lens L2 is made of plastic material, and the object side surface S3 and the image side surface S4 are both aspherical. The object side surface S3 is a convex surface near the optical axis, and a concave surface at the circumference. The near optical axis of the side S4 is concave, and the circumference is concave.

The third lens L3 is made of plastic material, and the object side S5 and the image side S6 are both aspherical. The object side surface S5 is a convex surface near the optical axis and a convex surface at the circumference. Like the side S6, the near optical axis and the circumference are convex.

The fourth lens L4 is made of plastic material, and the object side surface S7 and the image side surface S8 are both aspherical. The object side S7 is a concave surface near the optical axis, and a convex surface at the circumference. Like the side S8, the near-optical axis is convex, and the circumference is concave.

The fifth lens L5 is made of plastic material, and the object side surface S9 and the image side surface S10 are both aspherical. The object side surface S9 is concave at the near optical axis and at the circumference. The near optical axis of the side S10 is concave, and the circumference is convex.

The sixth lens L6 is made of plastic material, and the object side surface S11 and the image side surface S12 are both aspherical. The object side surface S11 is convex at the near optical axis and at the circumference. Image side S12 is concave at the near optical axis, and concave at the circumference.

The seventh lens L7 is made of plastic material, and the object side surface S13 and the image side surface S14 are both aspherical. The object side surface S13 is a convex surface near the optical axis, and a concave surface at the circumference. Image side S14 is concave at the near optical axis, and convex at the circumference.

In this embodiment, TTL=6.88, Imgh=5.32, TTL/Imgh=1.29; f=4.39, R14=1.29, f/R14=3.39; FNO=1.88; SD12=1.85, SD21=1.51, SD12/SD21= 1.229; TTL/f=1.57; R13=2.73, R14=1.29, (R13+R14)/(R13-R14)=2.80; T45=0.54, CT5=0.66, T45/CT5=0.82; T34=0.14, CT4= 0.34, T34/CT4=0.40.

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

The FOV in Table 5 is the field angle of the optical imaging system 100 in the diagonal direction.

Table 6 shows the aspherical surface data of the third embodiment, wherein k is the conic coefficient of each surface, and A4-A20 are the 4th-20th order aspherical surface coefficients of each surface.

It can be seen from FIG. 3-2 that the optical imaging system 100 of the present invention has higher pixels under the condition of miniaturization.

Fourth Embodiment

Please refer to FIGS. 4-1 and 4-2, wherein FIG. 4-1 is a schematic structural diagram of the optical imaging system 100 according to the fourth embodiment, and FIG. 4-2 is the spherical aberration of the fourth embodiment of the present invention from left to right. , astigmatism and distortion curves. As can be seen from FIG. 4-1 , the optical imaging system 100 of this embodiment sequentially includes a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a diaphragm 10 , and a positive refractive power lens from the object side to the image side. A third lens L3 with a high power, a fourth lens L4 with a negative power, a fifth lens L5 with a negative power, a sixth lens L6 with a positive power, a seventh lens L7 with a negative power, Infrared filter 30 and imaging surface 50 .

The first lens L1 is made of plastic material, and the object side surface S1 and the image side surface S2 are both aspherical. The object side S1 near the optical axis is concave, and the circumference is convex. Image side S2 is convex at the near optical axis, and concave at the circumference.

The second lens L2 is made of plastic material, and the object side surface S3 and the image side surface S4 are both aspherical. The object side surface S3 is a convex surface near the optical axis, and a concave surface at the circumference. Like the side S4, the near optical axis is concave, and the circumference is convex.

The third lens L3 is made of plastic material, and the object side S5 and the image side S6 are both aspherical. The object side surface S5 is a convex surface near the optical axis and a convex surface at the circumference. Like the side S6, the near optical axis and the circumference are convex.

The fourth lens L4 is made of plastic material, and the object side surface S7 and the image side surface S8 are both aspherical. The object side S7 is a concave surface near the optical axis, and a convex surface at the circumference. Like the side S8, the near-optical axis is convex, and the circumference is concave.

The fifth lens L5 is made of plastic material, and the object side surface S9 and the image side surface S10 are both aspherical. The object side surface S9 is concave at the near optical axis and at the circumference. Like the side S10, the near-optical axis is convex, and the circumference is convex.

The sixth lens L6 is made of plastic material, and the object side surface S11 and the image side surface S12 are both aspherical. The object side surface S11 is convex at the near optical axis and at the circumference. Image side S12 is convex at the near optical axis, and concave at the circumference.

The seventh lens L7 is made of plastic material, and the object side surface S13 and the image side surface S14 are both aspherical. The object side surface S13 is a convex surface near the optical axis, and a concave surface at the circumference. Image side S14 is concave at the near optical axis, and convex at the circumference.

In this embodiment, TTL=6.88, Imgh=5.32, TTL/Imgh=1.29; f=4.38, R14=1.30, f/R14=3.38; FNO=1.9; SD12=1.83, SD21=1.48, SD12/SD21= 1.239; TTL/f=1.57; R13=2.93, R14=1.30, (R13+R14)/(R13-R14)=2.56; T45=0.53, CT5=0.69, T45/CT5=0.77; T34=0.14, CT4= 0.43, T34/CT4=0.32.

In this embodiment, the optical imaging system 100 satisfies the conditions in Tables 7 and 8 below.

In Table 7, the FOV is the field angle of the optical imaging system 100 in the diagonal direction.

Table 8 shows the aspherical surface data of the fourth embodiment, wherein k is the conic coefficient of each surface, and A4-A20 are the 4th-20th order aspherical surface coefficients of each surface.

It can be seen from FIG. 4-2 that the optical imaging system 100 of the present invention has higher pixels under the condition of miniaturization.

Fifth Embodiment

Please refer to FIGS. 5-1 and 5-2, wherein FIG. 5-1 is a schematic structural diagram of the optical imaging system 100 according to the fifth embodiment, and FIG. 5-2 is the spherical aberration of the fifth embodiment of the present invention from left to right. , astigmatism and distortion curves. It can be seen from FIG. 5-1 that the optical imaging system 100 of this embodiment sequentially includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a diaphragm 10, and a positive light The third lens L3 with positive power, the fourth lens L4 with positive power, the fifth lens L5 with negative power, the sixth lens L6 with positive power, the seventh lens L7 with negative power, Infrared filter 30 and imaging surface 50 .

The first lens L1 is made of plastic material, and the object side surface S1 and the image side surface S2 are both aspherical. The object side surface S1 is a concave surface near the optical axis, and the circumference is a concave surface. Image side S2 is convex at the near optical axis, and convex at the circumference.

The second lens L2 is made of plastic material, and the object side surface S3 and the image side surface S4 are both aspherical. The object side surface S3 is a convex surface near the optical axis and a convex surface at the circumference. The near optical axis of the side S4 is concave, and the circumference is concave.

The third lens L3 is made of plastic material, and the object side S5 and the image side S6 are both aspherical. The object side surface S5 is a convex surface near the optical axis and a convex surface at the circumference. Like the side S6, the near optical axis and the circumference are convex.

The fourth lens L4 is made of plastic material, and the object side surface S7 and the image side surface S8 are both aspherical. The object side S7 is a concave surface near the optical axis, and a convex surface at the circumference. Like the side S8, the near-optical axis is convex, and the circumference is concave.

The fifth lens L5 is made of plastic material, and the object side surface S9 and the image side surface S10 are both aspherical. The object side surface S9 is concave at the near optical axis and at the circumference. Like the side S10, the near-optical axis is convex, and the circumference is convex.

The sixth lens L6 is made of plastic material, and the object side surface S11 and the image side surface S12 are both aspherical. The object side surface S11 is convex at the near optical axis and at the circumference. Image side S12 is convex at the near optical axis, and concave at the circumference.

The seventh lens L7 is made of plastic material, and the object side surface S13 and the image side surface S14 are both aspherical. The object side surface S13 is a convex surface near the optical axis, and a concave surface at the circumference. Image side S14 is concave at the near optical axis, and convex at the circumference.

In this embodiment, TTL=6.88, Imgh=5.32, TTL/Imgh=1.29; f=4.40, R14=1.44, f/R14=3.05; FNO=1.95; SD12=1.88, SD21=1.49, SD12/SD21= 1.265; TTL/f=1.56; R13=4.07, R14=1.44, (R13+R14)/(R13-R14)=2.10; T45=0.17, CT5=0.69, T45/CT5=0.25; T34=0.25, CT4= 0.34, T34/CT4=0.76.

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

The FOV in Table 9 is the field angle of the optical imaging system 100 in the diagonal direction.

Table 10 shows the aspherical surface data of the fifth embodiment, wherein k is the conic coefficient of each surface, and A4-A20 are the 4th-20th order aspherical surface coefficients of each surface.

It can be seen from FIG. 5-2 that the optical imaging system 100 of the present invention has higher pixels under the condition of miniaturization.

Sixth Embodiment

Please refer to FIGS. 6-1 and 6-2, wherein FIG. 6-1 is a schematic structural diagram of the optical imaging system 100 according to the sixth embodiment, and FIG. 6-2 is the spherical aberration of the sixth embodiment of the present invention from left to right. , astigmatism and distortion curves. It can be seen from FIG. 6-1 that the optical imaging system 100 of this embodiment sequentially includes, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a diaphragm 10, and a positive light The third lens L3 with negative power, the fourth lens L4 with negative power, the fifth lens L5 with positive power, the sixth lens L6 with positive power, the seventh lens L7 with negative power, Infrared filter 30 and imaging surface 50 .

The first lens L1 is made of plastic material, and the object side surface S1 and the image side surface S2 are both aspherical. The object side S1 near the optical axis is concave, and the circumference is convex. Image side S2 is convex at the near optical axis, and concave at the circumference.

The second lens L2 is made of plastic material, and the object side surface S3 and the image side surface S4 are both aspherical. The object side surface S3 is a convex surface near the optical axis, and a concave surface at the circumference. Like the side S4, the near optical axis is concave, and the circumference is convex.

The third lens L3 is made of plastic material, and the object side S5 and the image side S6 are both aspherical. The object side surface S5 is a convex surface near the optical axis and a convex surface at the circumference. Like the side S6, the near optical axis and the circumference are convex.

The fourth lens L4 is made of plastic material, and the object side surface S7 and the image side surface S8 are both aspherical. The object side S7 is a concave surface near the optical axis, and a convex surface at the circumference. Like the side S8, the near-optical axis is convex, and the circumference is concave.

The fifth lens L5 is made of plastic material, and the object side surface S9 and the image side surface S10 are both aspherical. The object side surface S9 is concave at the near optical axis and at the circumference. Like the side S10, the near-optical axis is convex, and the circumference is convex.

The sixth lens L6 is made of plastic material, and the object side surface S11 and the image side surface S12 are both aspherical. The object side surface S11 is convex at the near optical axis and at the circumference. Image side S12 is concave at the near optical axis, and concave at the circumference.

The seventh lens L7 is made of plastic material, and the object side surface S13 and the image side surface S14 are both aspherical. The object side surface S13 is a convex surface near the optical axis, and a concave surface at the circumference. Image side S14 is concave at the near optical axis, and convex at the circumference.

In this embodiment, TTL=6.88, Imgh=5.32, TTL/Imgh=1.29; f=4.39, R14=1.30, f/R14=3.36; FNO=1.88; SD12=1.85, SD21=1.51, SD12/SD21= 1.23; TTL/f=1.57; R13=2.82, R14=1.30, (R13+R14)/(R13-R14)=2.72; T45=0.55, CT5=0.73, T45/CT5=0.76; T34=0.13, CT4= 0.34, T34/CT4=0.38.

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

In Table 11, the FOV is the angle of view of the optical imaging system 100 in the diagonal direction.

Table 12 shows the aspherical surface data of the sixth embodiment, wherein k is the conic coefficient of each surface, and A4-A20 are the 4th-20th order aspherical surface coefficients of each surface.

It can be seen from FIG. 6-2 that the optical imaging system 100 of the present invention has higher pixels under the condition of miniaturization.

As shown in FIG. 7 , the present invention further provides an imaging device 200 including the optical imaging system 100 and the photosensitive element 210 of the present invention. The photosensitive element 210 is located on the image side of the optical imaging system 100 .

The photosensitive element 210 of the present invention may be a charge coupled device (CCD) or a complementary metal-oxide semiconductor (Complementary Metal-Oxide Semiconductor Sensor, CMOS sensor).

For the description of other features of the image capturing device 200, please refer to the above description, which will not be repeated here.

As shown in FIG. 8 , the present invention further provides an electronic device 300 , which includes a device main body 310 and the imaging device 200 of the present invention. The orientation device 200 is installed on the apparatus main body 310 .

The electronic device 300 of the present invention includes, but is not limited to, computers, notebook computers, tablet computers, mobile phones, cameras, smart bracelets, smart watches, smart glasses, vehicle camera products, and the like.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any equivalent modifications or replacements should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (20)

1. An optical imaging system, characterized in that, from the object side to the image side, including: a first lens having optical power; a second lens having positive optical power; a third lens having positive optical power; a fourth lens having optical power; a fifth lens having optical power; a sixth lens having positive power; and a seventh lens with negative refractive power; Wherein, the optical imaging system satisfies the following relationship: 1<SD12/SD21<1.4; Wherein, SD12 is the effective semi-aperture of the image side of the first lens; SD21 is the effective semi-aperture of the object side of the second lens. 2 . The optical imaging system according to claim 1 , wherein the object sides of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens and the The sides of the image are aspherical. 3 . The optical imaging system according to claim 1 , wherein the object side of the first lens is concave at the near optical axis, and the image side near the optical axis is convex. 4 . 4 . The optical imaging system according to claim 1 , wherein the object side of the second lens is convex at the near optical axis, and the image side near the optical axis is concave. 5 . 5 . The optical imaging system according to claim 1 , wherein the circumference of the object side surface of the third lens is a convex surface; the near optical axis and the circumference of the image side surface are convex surfaces. 6 . 6. The optical imaging system according to claim 1, wherein the object side near optical axis of the fourth lens is concave, and the circumference is convex; the near optical axis on the image side is convex, and the circumference is concave . 7 . The optical imaging system according to claim 1 , wherein the near optical axis and the circumference of the object side of the fifth lens are concave; the circumference of the image side is convex. 8 . 8 . The optical imaging system according to claim 1 , wherein the object side near optical axis and the circumference of the sixth lens are convex surfaces; the image side circumference is concave. 9 . 9. The optical imaging system according to claim 1, wherein the object side near optical axis of the seventh lens is convex, and the circumference is concave; the image side near optical axis is concave, and the circumference is convex . 10 . The optical imaging system according to claim 1 , wherein the optical imaging system further comprises an infrared filter, and the infrared filter is located between the seventh lens and the imaging surface. 11 . 11 . The optical imaging system according to claim 1 , wherein the optical imaging system further comprises a diaphragm, and the diaphragm is located between the second lens and the third lens. 12 . . 12. The optical imaging system according to claim 11, wherein the optical imaging system satisfies the following conditional formula: TTL/Imgh<1.3; 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 on the imaging surface. 13. The optical imaging system according to claim 11, wherein the optical imaging system satisfies the following conditional formula: 2<f/R14<4; Wherein, f is the effective focal length of the optical imaging system, and R14 is the curvature radius of the image side surface of the seventh lens. 14. The optical imaging system according to claim 11, wherein the optical imaging system satisfies the following conditional formula: Fno<2; Wherein, Fno is the aperture number of the optical imaging system. 15. The optical imaging system according to claim 11, wherein the optical imaging system satisfies the following conditional formula: TTL/f<1.6; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis; f is the effective focal length of the optical system. 16. The optical imaging system according to claim 11, wherein the optical imaging system satisfies the following conditional formula: 1<(R13+R14)/(R13－R14)<4; Wherein, R13 is the radius of curvature of the object side of the seventh lens, and R14 is the radius of curvature of the image side of the seventh lens. 17. The optical imaging system according to claim 11, wherein the optical imaging system satisfies the following conditional formula: 0.1＜T45/CT5＜1; Wherein, T45 is the distance between the fourth lens and the fifth lens on the optical axis, and CT5 is the central thickness of the fifth lens. 18. The optical imaging system according to claim 11, wherein the optical imaging system satisfies the following conditional formula: 0＜T34/CT4＜0.82; Wherein, T34 is the distance between the third lens and the fourth lens on the optical axis, and CT4 is the central thickness of the fourth lens. 19. An imaging device, comprising: The optical imaging system of any one of claims 1-18; and A photosensitive element, which is located on the image side of the optical imaging system. 20. An electronic device, characterized in that, comprising: the main body of the equipment and; The imaging device according to claim 19, wherein the imaging device is mounted on the main body of the apparatus.

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