WO2022056934A1 - Optical imaging system, image capturing module, and electronic device - Google Patents

Abstract

An optical imaging system (10), an image capturing module, and an electronic device. The optical imaging system (10) sequentially comprises, from an object side to an image side: a first lens (L1) having positive refractive power, an object-side surface (S1) of the first lens (L1) being convex in a paraxial region and an image-side surface (S2) being concave in the paraxial region; a second lens (L2) having positive refractive power, an object-side surface (S3) of the second lens (L2) being convex in a paraxial region; a third lens (L3) having negative refractive power, an image-side surface (S6) of the third lens (L3) being concave in the paraxial region; a fourth lens (L4) having refractive power; a fifth lens (L5) having refractive power; a sixth lens (L6) having refractive power; and a seventh lens (L7) having negative refractive power. The optical imaging system (10) satisfies the following condition: 0.5<(L72p1‑L72p2)/L72c. The optical imaging system (10) increases a focal length and improves relative brightness while implementing miniature design, can still achieve a clear imaging effect when photographing in a dark environment, can be used for distant-view photographing, improves magnification power, and has functions of blurring background and highlighting objects to be photographed.

Description

Optical imaging system, imaging module and electronic device technical field

The invention relates to the technical field of optical imaging, in particular to an optical imaging system, an imaging module and an electronic device.

Background technique

With the wide application of electronic products such as mobile phones, tablet computers, drones, computers and other electronic products in daily life, various technological products have been gradually improved and brought forth new ones. Among them, the improvement and innovation of the shooting effect of imaging modules in electronic products has become the focus of attention. One of them has also become an important part of technological improvement.

In the process of realizing this application, the inventor found that there are at least the following problems in the prior art: along with photocouplers (CCD, Charge-coupled Device) and complementary metal oxide semiconductor (CMOS, Complementary Metal Oxide Semiconductor) image sensors The improvement in the performance of photosensitive elements such as these has put forward higher requirements for the optical imaging system. Whether the optical imaging system can be used to take high-quality, high-resolution, high-definition pictures, even in low light conditions Taking pictures with clear picture quality has become a key factor for modern people to choose electronic products.

SUMMARY OF THE INVENTION

In view of the above content, it is necessary to propose an optical imaging system, an imaging module and an electronic device to solve the above problems.

An embodiment of the present application provides an optical imaging system, which includes sequentially from the object side to the image side:

The first lens with positive bending power, the object side of the first lens is convex at the near-optical axis, and the image side is concave at the near-optical axis;

a second lens with positive bending power, the object side of the second lens is convex at the near optical axis;

a third lens with negative bending power, the image side surface of the third lens is concave at the near optical axis;

a fourth lens having a bending force;

a fifth lens with a bending force;

a sixth lens having a bending power; and

a seventh lens with negative tortuosity;

The optical imaging system satisfies the following conditional formula:

0.5<(L72p1-L72p2)/L72c;

Wherein, L72c represents the maximum effective aperture in the direction perpendicular to the optical axis when the central beam passes through the image side surface of the seventh lens, and the central beam is the beam incident on the center of the imaging plane of the optical imaging system;

L72p1 represents the maximum vertical distance from the intersection of the edge beam and the image side of the seventh lens to the optical axis, L72p2 represents the minimum vertical distance from the intersection of the edge beam and the image side of the seventh lens to the optical axis, and the edge beam is The light beam that is incident on the imaging plane of the optical imaging system at the point farthest from the optical axis.

The above-mentioned optical imaging system, while satisfying the miniature design, increases the focal length, the field of view angle is smaller than that of the conventional optical imaging system, and the relative brightness is improved. Enhanced magnification, and has functions such as blurring the background and highlighting the subject.

In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all non- spherical.

In this way, by adjusting the curvature radius and aspheric coefficient of each lens surface, the total length of the optical imaging system can be effectively reduced, the aberration of the optical imaging system can be effectively corrected, and the imaging quality can be improved.

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

TTL/Imgh<2.7;

Wherein, TTL is the distance from the object side of the first lens to the image plane of the optical imaging system on the optical axis, and Imgh is the image height corresponding to half of the maximum angle of view of the optical imaging system.

In this way, when the image plane is fixed, the overall length of the optical imaging system can be ensured to be small, and the miniaturization of the optical imaging system can be realized.

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

TTL/f<1.2;

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

In this way, when the TTL is fixed and the miniaturization is satisfied, the effective focal length will have a lower limit value, which can ensure the long focal length characteristics of the optical imaging system, and realize functions such as large magnification and depth of field blurring.

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

-1.7<f1_2/f3_7<-0.5;

Wherein, f1_2 is the combined focal length of the first lens to the second lens; f3_7 is the combined focal length of the third lens to the seventh lens.

In this way, it is helpful to reasonably distribute the bending force of the two parts of the optical imaging system, which can better correct the chromatic aberration of the optical imaging system and improve the performance of the optical imaging system.

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

FNO<1.9;

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

In this way, on the premise of maintaining the long focus of the optical imaging system, a large amount of light through the optical imaging system can be achieved. When the optical imaging system has a large luminous flux per unit time, even when shooting in a dark environment, a clear imaging effect can be achieved.

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

Imgh/tan(HFOV)>6mm;

Wherein, Imgh is the image height corresponding to half of the maximum angle of view of the optical imaging system, and HFOV is half of the maximum angle of view of the optical imaging system.

In this way, the telephoto characteristic of the optical imaging system can be maintained, and the magnification of imaging can be increased.

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

ct1/et1<3.5;

Wherein, ct1 is the thickness of the first lens along the optical axis, and et1 is the edge thickness of the first lens along the optical axis.

In this way, from the viewpoint of the manufacturability of the lens, it is easy to form and the cost is low.

An embodiment of the present application provides an imaging module, including:

the above-mentioned optical imaging system; and

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

The optical imaging system in the above-mentioned imaging module not only meets the miniature design, but also increases the focal length, the field of view angle is smaller than that of the conventional optical imaging system, the relative brightness is improved, and the shooting in a dark environment can also achieve clear imaging effects. It can also be used to shoot distant scenes, with increased magnification, and has functions such as blurring the background and highlighting the subject.

An embodiment of the present application provides an electronic device, including:

the shell; and

In the above-mentioned image capturing module, the image capturing module is installed on the casing.

The optical imaging system in the above-mentioned electronic device not only meets the miniature design, but also increases the focal length, the field of view angle is smaller than that of the conventional optical imaging system, and the relative brightness is improved. For shooting distant scenes, the magnification has been increased, and it has functions such as blurring the background and highlighting the subject.

Additional aspects and advantages of embodiments of the present invention will be set forth, in part, from the following description, and in part will become apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention may be apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of an optical path of an optical imaging system according to one embodiment of the present invention.

FIG. 2 is a schematic structural diagram of an optical imaging system according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram of spherical aberration, astigmatism and distortion according to the first embodiment of the present invention.

FIG. 4 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram of spherical aberration, astigmatism and distortion according to the second embodiment of the present invention.

FIG. 6 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present invention.

FIG. 7 is a schematic diagram of spherical aberration, astigmatism and distortion according to the third embodiment of the present invention.

FIG. 8 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention.

FIG. 9 is a schematic diagram of spherical aberration, astigmatism and distortion according to the fourth embodiment of the present invention.

FIG. 10 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.

FIG. 11 is a schematic diagram of spherical aberration, astigmatism and distortion according to the fifth embodiment of the present invention.

FIG. 12 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention.

FIG. 13 is a schematic diagram of spherical aberration, astigmatism and distortion according to the sixth embodiment of the present invention.

FIG. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Description of main component symbols

Electronic device 1000

Image acquisition module 100

Optical imaging system 10

The first lens L1

Second lens L2

The third lens L3

Fourth lens L4

Fifth lens L5

The sixth lens L6

The seventh lens L7

IR cut filter L8

Aperture STO

Object side S1, S3, S5, S7, S9, S11, S13, S15

Like the side S2, S4, S6, S8, S10, S12, S14, S16

Like face S17

Photosensitive element 20

Shell 200

detailed description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

Referring to FIG. 1 , the following are descriptions of terms involved in the embodiments of the present application:

Field of view (FOV): In an optical instrument, the angle formed by the lens of the optical instrument as the vertex and the angle formed by the two edges of the maximum range of the object image that can pass through the lens is called the field of view. The size of the field of view determines the field of view of the optical instrument. The larger the field of view, the larger the field of view. That is, objects within the field of view can be photographed through the lens, and objects outside the field of view cannot be seen. The entire visible range corresponds to the imaging surface of the optical instrument one-to-one. The imaging surface is evenly distributed into N parts from the optical axis outwards. The light of the central field of view (central beam) converges at the optical axis and is marked as 0 view. The light from the edge field of view (edge beam) converges at the farthest point off the axis and is recorded as 1.0 field of view, 0 to 0.5 is the inner field of view, and 0.6 to 1.0 is the outer field of view.

Referring to FIG. 2, an embodiment of the present invention provides an optical imaging system 10, which includes a first lens L1 with a positive inflection force, a second lens L2 with a positive inflection force, and a negative inflection force in sequence from the object side to the image side A powerful third lens L3, a fourth lens L4 having a bending power, a fifth lens L5 having a bending power, a sixth lens L6 having a bending power, and a seventh lens L7 having a negative bending power.

The first lens L1 has an object side S1 and an image side S2, the object side S1 of the first lens L1 is convex at the near optical axis, and the image side S2 is concave at the near optical axis; the second lens L2 has an object side S3 and an image. Side S4, the object side S3 of the second lens L2 is a convex surface at the near optical axis; the third lens L3 has an object side S5 and an image side S6, and the image side S6 of the third lens L3 is a concave surface at the near optical axis; the fourth The lens L4 has an object side S7 and an image side S8; the fifth lens L5 has an object side S9 and an image side S10; the sixth lens L6 has an object side S11 and an image side S12; the seventh lens L7 has an object side S13 and an image side S14.

The optical imaging system 10 satisfies the following conditional formula:

0.5<(L72p1-L72p2)/L72c;

Wherein, as shown in FIG. 1 , L72c represents the maximum effective aperture in the direction perpendicular to the optical axis when the central beam passes through the image side surface S14 of the seventh lens L7 , and the central beam is incident on the optical imaging system 10 . the beam at the center of the imaging plane;

L72p1 represents the maximum vertical distance from the intersection of the edge beam and the image side S14 of the seventh lens L7 to the optical axis, L72p2 represents the minimum vertical distance from the intersection of the edge beam and the image side S14 of the seventh lens L7 to the optical axis, so The edge light beam is the light beam incident on the imaging plane of the optical imaging system 10 at the farthest point from the optical axis.

The above-mentioned optical imaging system 10, while satisfying the miniature design, increases the focal length, the angle of view is smaller than that of the conventional optical imaging system, improves the relative brightness, can achieve a clear imaging effect even when shooting in a dark environment, and can be used for long-range shooting , enhances the magnification, and has functions such as blurring the background and highlighting the subject. However, when (L72p1-L72p2)/L72c does not satisfy the above conditional expression, the edge brightness of the optical imaging system 10 is insufficient, and vignetting is likely to occur.

In some embodiments, the optical imaging system 10 further includes a stop STO. The stop STO can be arranged on the surface of any one lens, or arranged before the first lens L1, or arranged between any two lenses, or arranged on the image side S14 of the seventh lens L7. For example, in FIG. 2, the stop STO is provided on the object side surface S1 of the first lens L1.

In some embodiments, the optical imaging system 10 further includes an infrared cut filter L8, and the infrared cut filter L8 has an object side S15 and an image side S16. The infrared cut filter L8 is arranged on the image side of the seventh lens L7 to filter out light in other wavelength bands such as visible light, and only let the infrared light pass through, so that the optical imaging system 10 can be used in dark environments and other special applications The scene can also be imaged.

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 aspherical surfaces.

In this way, by adjusting the curvature radius and aspheric coefficient of each lens surface, the total length of the optical imaging system 10 can be effectively reduced, the aberration of the optical imaging system 10 can be effectively corrected, and the imaging quality can be improved.

In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

TTL/Imgh<2.7;

Wherein, TTL is the distance on the optical axis from the object side S1 of the first lens L1 to the image plane S17 of the optical imaging system 10 , and Imgh is the image height corresponding to half of the maximum angle of view of the optical imaging system 10 .

In this way, when the image plane S17 is fixed, the overall length of the optical imaging system 10 can be kept small, thereby realizing the miniaturization of the optical imaging system 10 .

In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

TTL/f<1.2;

Wherein, TTL is the distance on the optical axis from the object side S1 of the first lens L1 to the image plane S17 of the optical imaging system 10 , and f is the effective focal length of the optical imaging system 10 .

In this way, when the TTL is fixed and miniaturization is satisfied, the effective focal length has a lower limit value, which can ensure the long focal length characteristics of the optical imaging system 10, and realize functions such as large magnification and depth of field blurring. However, when the TTL/f does not satisfy the above-mentioned conditional expression, the telephoto characteristic of the optical imaging system 10 cannot be satisfied.

In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

-1.7<f1_2/f3_7<-0.5;

Wherein, f1_2 is the combined focal length of the first lens L1 to the second lens L2; f3_7 is the combined focal length of the third lens L3 to the seventh lens L7.

In this way, it is helpful for the reasonable distribution of the bending force of the two parts of the optical imaging system 10, which can better correct the chromatic aberration of the optical imaging system 10 and improve the performance of the optical imaging system 10, wherein the first part includes the first lens L1 to the second lens L2. , and the second part includes the third lens L3 to the seventh lens L7. However, when f1_2/f3_7 does not satisfy the above conditional expression, the tortuous force of the two parts cannot be reasonably matched, resulting in an increase in the MTF (modulation transfer function) sensitivity of one side, which is not conducive to actual production and processing.

In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

FNO<1.9;

Wherein, FNO is the aperture number of the optical imaging system 10 .

In this way, on the premise of maintaining the telephoto property of the optical imaging system 10, a large amount of light through the optical imaging system 10 can be achieved. When the optical imaging system 10 has a large amount of light per unit time, even in a dark environment, a clear image can be achieved. Imaging effect. However, when the FNO does not satisfy the above conditional expression, the shooting effect is not good in a dark environment.

In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

Imgh/tan(HFOV)>6mm;

Wherein, Imgh is the image height corresponding to half of the maximum angle of view of the optical imaging system 10 , and HFOV is the half of the maximum angle of view of the optical imaging system 10 .

In this way, the telephoto characteristic of the optical imaging system 10 can be maintained, and the magnification of imaging can be increased. However, when Imgh/tan(HFOV) does not satisfy the above conditional expression, the telephoto characteristic of the optical imaging system 10 cannot be guaranteed.

In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

ct1/et1<3.5;

Wherein, ct1 is the thickness of the first lens L1 along the optical axis, and et1 is the edge thickness of the first lens L1 along the optical axis.

In this way, from the viewpoint of the manufacturability of the lens, it is easy to form and the cost is low. However, when ct1/et1 does not satisfy the above conditional expression, the lens will be difficult to form in actual production, and it is not easy to process and mass-produce.

first embodiment

Referring to FIG. 2 and FIG. 3 , the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with positive inflection power, a second lens L2 with positive inflection power, The third lens L3 with negative inflection power, the fourth lens L4 with negative inflection power, the fifth lens L5 with positive inflection power, the sixth lens L6 with positive inflection power, the seventh lens L7 with negative inflection power, and the IR cut filter L8.

The object side S1 of the first lens L1 is convex at the near optical axis, the image side S2 of the first lens L1 is concave at the near optical axis, the object side S3 of the second lens L2 is convex at the near optical axis, and the second lens L2 is convex at the near optical axis. The image side S4 of the lens L2 is concave at the near optical axis, the object side S5 of the third lens L3 is convex at the near optical axis, the image side S6 of the third lens L3 is concave at the near optical axis, and the fourth lens L4 The object side S7 is convex at the near optical axis, the image side S8 of the fourth lens L4 is concave at the near optical axis, the object side S9 of the fifth lens L5 is convex at the near optical axis, and the image of the fifth lens L5 is convex at the near optical axis. The side S10 is concave at the near optical axis, the object side S11 of the sixth lens L6 is convex at the near optical axis, the image side S12 of the sixth lens L6 is concave at the near optical axis, and the object side S13 of the seventh lens L7 The image side surface S14 of the seventh lens L7 is concave at the near optical axis.

The object side S1 of the first lens L1 is concave at the near circumference, the image side S2 of the first lens L1 is convex at the near circumference, the object side S3 of the second lens L2 is concave at the near circumference, and the second lens L2 is concave at the near circumference. The image side S4 is convex near the circumference, the object side S5 of the third lens L3 is convex near the circumference, the image side S6 of the third lens L3 is convex near the circumference, and the object side S7 of the fourth lens L4 is near the circumference. The circumference is concave, the image side S8 of the fourth lens L4 is convex at the near circumference, the object side S9 of the fifth lens L5 is concave at the near circumference, and the image side S10 of the fifth lens L5 is convex at the near circumference, The object side S11 of the sixth lens L6 is concave at the near circumference, the image side S12 of the sixth lens L6 is concave at the near circumference, the object side S13 of the seventh lens L7 is convex at the near circumference, and the seventh lens L7 has a convex surface. The image side S14 is concave near the circumference.

When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut filter L8, and finally converge on the image plane S17

Table 1 shows a table of characteristics of the optical imaging system of this embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and Abbe number are all 587.56 nm, and the units of Y radius, thickness and focal length are all 587.56 nm. millimeters (mm).

Table 1

Among them, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side S1 of the first lens L1 to the optical imaging system 10. The distance of the image plane S17 on the optical axis.

In this embodiment, 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 aspherical surfaces, and the surface of each spherical lens is Type Z can be defined using, but not limited to, the following aspheric formula.

where Z is the longitudinal distance between any point on the aspheric surface and the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the conic constant, and Ai is the i-th aspheric surface The correction coefficients of the order, Table 2 shows the coefficients K, A4, A6, A8, A10, .

Form 2

face number K A4 A6 A8 A10 S1 -0.7247 0.0018 0.0000 0.0000 0.0000 S2 -5.3477 -0.0058 0.0032 -0.0013 0.0004 S3 0.5223 -0.0099 0.0041 -0.0020 0.0009 S4 -30.5665 -0.0504 0.0509 -0.0328 0.0143 S5 20.2224 -0.0462 0.0456 -0.0316 0.0149 S6 1.0602 -0.0003 0.0040 -0.0077 0.0073 S7 -34.4512 -0.0026 -0.0063 0.0020 -0.0036 S8 0.0000 -0.0153 0.0004 -0.0057 0.0032 S9 -27.3859 -0.0051 -0.0023 -0.0030 0.0013 S10 -9.9644 -0.0208 0.0055 -0.0050 0.0023 S11 16.6179 -0.0245 0.0030 -0.0043 0.0032 S12 -18.0000 -0.0181 0.0017 -0.0014 0.0007

S13 2.9070 -0.0587 0.0157 -0.0054 0.0024 S14 -17.5480 -0.0266 0.0025 0.0007 -0.0004 face number A12 A14 A16 A18 A20 S1 0.0000 0.0000 0.0000 0.0000 0.0000 S2 -0.0001 0.0000 0.0000 0.0000 0.0000 S3 -0.0003 0.0001 0.0000 0.0000 0.0000 S4 -0.0042 0.0008 -0.0001 0.0000 0.0000 S5 -0.0047 0.0010 -0.0001 0.0000 0.0000 S6 -0.0046 0.0020 -0.0006 0.0001 0.0000 S7 0.0037 -0.0019 0.0006 -0.0001 0.0000 S8 -0.0005 -0.0001 0.0001 0.0000 0.0000 S9 -0.0004 0.0001 0.0000 0.0000 0.0000 S10 -0.0011 0.0004 -0.0001 0.0000 0.0000 S11 -0.0017 0.0005 -0.0001 0.0000 0.0000 S12 -0.0003 0.0001 0.0000 0.0000 0.0000 S13 -0.0009 0.0002 0.0000 0.0000 0.0000 S14 0.0001 0.0000 0.0000 0.0000 0.0000

Table 2 shows the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical imaging system 10 of the first embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional curvature of the image plane and the sagittal image plane curvature; the distortion curve represents the distortion magnitude corresponding to different field angles. According to Table 2, the optical imaging system 10 provided in the first embodiment can achieve good imaging quality.

Second Embodiment

Referring to FIG. 4 and FIG. 5 , the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with positive inflection power, a second lens L2 with positive inflection power, The third lens L3 with negative inflection power, the fourth lens L4 with positive inflection power, the fifth lens L5 with positive inflection power, the sixth lens L6 with positive inflection power, the seventh lens L7 with negative inflection power, and the IR cut filter L8.

The object side S1 of the first lens L1 is convex at the near optical axis, the image side S2 of the first lens L1 is concave at the near optical axis, the object side S3 of the second lens L2 is convex at the near optical axis, and the second lens L2 is convex at the near optical axis. The image side S4 of the lens L2 is convex at the near optical axis, the object side S5 of the third lens L3 is convex at the near optical axis, the image side S6 of the third lens L3 is concave at the near optical axis, and the fourth lens L4 The object side S7 is concave at the near optical axis, the image side S8 of the fourth lens L4 is convex at the near optical axis, the object side S9 of the fifth lens L5 is convex at the near optical axis, and the image of the fifth lens L5 is convex at the near optical axis. The side S10 is concave at the near optical axis, the object side S11 of the sixth lens L6 is convex at the near optical axis, the image side S12 of the sixth lens L6 is concave at the near optical axis, and the object side S13 of the seventh lens L7 The image side surface S14 of the seventh lens L7 is concave at the near optical axis, and the image side surface S14 of the seventh lens L7 is concave at the near optical axis.

The object side S1 of the first lens L1 is concave at the near circumference, the image side S2 of the first lens L1 is convex at the near circumference, the object side S3 of the second lens L2 is concave at the near circumference, and the second lens L2 is concave at the near circumference. The image side S4 is convex near the circumference, the object side S5 of the third lens L3 is convex near the circumference, the image side S6 of the third lens L3 is concave near the circumference, and the object side S7 of the fourth lens L4 is near the circumference. The circumference is concave, the image side S8 of the fourth lens L4 is concave at the near circumference, the object side S9 of the fifth lens L5 is concave at the near circumference, and the image side S10 of the fifth lens L5 is convex at the near circumference, The object side S11 of the sixth lens L6 is concave at the near circumference, the image side S12 of the sixth lens L6 is concave at the near circumference, the object side S13 of the seventh lens L7 is convex at the near circumference, and the seventh lens L7 has a convex surface. The image side S14 is concave near the circumference.

When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut filter L8, and finally converge on the image plane S17.

Table 3 shows a table of characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and Abbe number are all 587.56 nm, and the units of Y radius, thickness and focal length are all 587.56 nm. in millimeters (mm).

Form 3

Among them, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side S1 of the first lens L1 to the optical imaging system 10. The distance of the image plane S17 on the optical axis.

In this embodiment, 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 aspherical surfaces, and the surface of each spherical lens is Type Z can be defined using, but not limited to, the following aspheric formula.

where Z is the longitudinal distance between any point on the aspheric surface and the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the conic constant, and Ai is the i-th aspheric surface The correction coefficients of the order, Table 4 gives the coefficients K, A4, A6, A8, A10 .

Form 4

face number K A4 A6 A8 A10 S1 -0.7694 0.0014 0.0000 0.0001 0.0000 S2 -4.9351 -0.0096 0.0044 -0.0002 -0.0007 S3 0.4786 -0.0132 0.0053 -0.0008 -0.0002 S4 -38.0000 -0.0307 0.0286 -0.0168 0.0064 S5 29.7782 -0.0379 0.0292 -0.0161 0.0063 S6 0.1593 -0.0120 0.0044 0.0004 -0.0019 S7 -18.0000 -0.0051 -0.0059 0.0022 -0.0029 S8 0.0000 -0.0138 -0.0006 0.0007 -0.0031 S9 -38.0000 -0.0107 -0.0011 0.0004 -0.0011 S10 -14.7382 -0.0218 0.0026 -0.0010 -0.0002 S11 16.6161 -0.0153 -0.0051 0.0007 0.0002 S12 -18.0000 -0.0032 -0.0053 -0.0009 0.0017 S13 -17.0930 -0.0389 0.0067 -0.0042 0.0027 S14 -17.5480 -0.0260 0.0024 0.0000 -0.0001 face number A12 A14 A16 A18 A20 S1 0.0000 0.0000 0.0000 0.0000 0.0000 S2 0.0003 -0.0001 0.0000 0.0000 0.0000 S3 0.0001 0.0000 0.0000 0.0000 0.0000 S4 -0.0016 0.0002 0.0000 0.0000 0.0000 S5 -0.0015 0.0002 0.0000 0.0000 0.0000 S6 0.0018 -0.0009 0.0002 0.0000 0.0000

S7 0.0027 -0.0014 0.0004 -0.0001 0.0000 S8 0.0032 -0.0016 0.0004 -0.0001 0.0000 S9 0.0005 -0.0001 0.0000 0.0000 0.0000 S10 0.0001 0.0000 0.0000 0.0000 0.0000 S11 -0.0002 0.0001 0.0000 0.0000 0.0000 S12 -0.0009 0.0002 0.0000 0.0000 0.0000 S13 -0.0012 0.0003 -0.0001 0.0000 0.0000 S14 0.0000 0.0000 0.0000 0.0000 0.0000

Table 4 shows the longitudinal spherical aberration curve, the astigmatism curve and the distortion curve of the optical imaging system 10 of the second embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional curvature of the image plane and the sagittal image plane curvature; the distortion curve represents the distortion magnitude corresponding to different field angles. It can be seen from Table 4 that the optical imaging system 10 given in the second embodiment can achieve good imaging quality.

Third Embodiment

Referring to FIGS. 6 and 7 , the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with a positive refractive power, a second lens L2 with a positive refractive power, The third lens L3 with negative inflection power, the fourth lens L4 with negative inflection power, the fifth lens L5 with positive inflection power, the sixth lens L6 with negative inflection power, the seventh lens L7 with negative inflection power, and the IR cut filter L8.

The object side S1 of the first lens L1 is convex at the near optical axis, the image side S2 of the first lens L1 is concave at the near optical axis, the object side S3 of the second lens L2 is convex at the near optical axis, and the second lens L2 is convex at the near optical axis. The image side S4 of the lens L2 is concave at the near optical axis, the object side S5 of the third lens L3 is convex at the near optical axis, the image side S6 of the third lens L3 is concave at the near optical axis, and the fourth lens L4 The object side S7 is convex at the near optical axis, the image side S8 of the fourth lens L4 is concave at the near optical axis, the object side S9 of the fifth lens L5 is convex at the near optical axis, and the image of the fifth lens L5 is convex at the near optical axis. The side S10 is convex at the near optical axis, the object side S11 of the sixth lens L6 is concave at the near optical axis, the image side S12 of the sixth lens L6 is convex at the near optical axis, and the object side S13 of the seventh lens L7 The image side surface S14 of the seventh lens L7 is concave at the near optical axis.

The object side S1 of the first lens L1 is concave near the circumference, the image side S2 of the first lens L1 is convex near the circumference, the object side S3 of the second lens L2 is convex near the circumference, and the second lens L2 has a convex surface. The image side S4 is concave near the circumference, the object side S5 of the third lens L3 is convex near the circumference, the image side S6 of the third lens L3 is concave near the circumference, and the object side S7 of the fourth lens L4 is near the circumference. The circumference is concave, the image side S8 of the fourth lens L4 is convex at the near circumference, the object side S9 of the fifth lens L5 is concave at the near circumference, and the image side S10 of the fifth lens L5 is convex at the near circumference, The object side S11 of the sixth lens L6 is concave at the near circumference, the image side S12 of the sixth lens L6 is concave at the near circumference, the object side S13 of the seventh lens L7 is convex at the near circumference, and the seventh lens L7 has a convex surface. The image side S14 is concave near the circumference.

When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut filter L8, and finally converge on the image plane S17.

Table 5 is a table showing the characteristics of the optical imaging system 10 of the present embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and Abbe number are all 587.56 nm, and the units of Y radius, thickness and focal length are all 587.56 nm. in millimeters (mm).

Form 5

Among them, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side S1 of the first lens L1 to the optical imaging system 10. The distance of the image plane S17 on the optical axis.

In this embodiment, 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 aspherical surfaces, and the surface of each spherical lens is Type Z can be defined using, but not limited to, the following aspheric formula.

where Z is the longitudinal distance between any point on the aspheric surface and the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the reciprocal of the radius of curvature), k is the conic constant, and Ai is the i-th aspheric surface For the correction coefficients of the order, Table 6 shows the coefficients K, A4, A6, A8, A10, . .

Form 6

face number K A4 A6 A8 A10 S1 -0.7263 0.0016 0.0000 0.0001 -0.0001 S2 -5.0303 -0.0170 0.0172 -0.0105 0.0043 S3 0.5112 -0.0213 0.0179 -0.0106 0.0041 S4 -18.0000 -0.0448 0.0458 -0.0323 0.0165 S5 19.4127 -0.0449 0.0443 -0.0339 0.0193 S6 0.9450 -0.0050 0.0072 -0.0094 0.0080 S7 -38.0000 -0.0108 -0.0017 -0.0013 0.0010 S8 0.0000 -0.0223 -0.0001 0.0018 -0.0045 S9 -38.0000 -0.0115 -0.0036 0.0030 -0.0046 S10 -3.4610 -0.0159 0.0002 -0.0003 -0.0003 S11 1.0730 -0.0126 -0.0029 -0.0022 0.0028 S12 -38.0000 -0.0014 -0.0023 -0.0027 0.0025 S13 1.2080 -0.0558 0.0243 -0.0139 0.0063 S14 -17.5480 -0.0129 -0.0032 0.0021 -0.0006 face number A12 A14 A16 A18 A20 S1 0.0000 0.0000 0.0000 0.0000 0.0000 S2 -0.0012 0.0002 0.0000 0.0000 0.0000 S3 -0.0010 0.0002 0.0000 0.0000 0.0000 S4 -0.0060 0.0015 -0.0002 0.0000 0.0000 S5 -0.0078 0.0021 -0.0004 0.0000 0.0000 S6 -0.0044 0.0017 -0.0004 0.0001 0.0000 S7 -0.0005 0.0002 -0.0001 0.0000 0.0000 S8 0.0043 -0.0022 0.0007 -0.0001 0.0000 S9 0.0033 -0.0016 0.0005 -0.0001 0.0000 S10 0.0001 -0.0001 0.0000 0.0000 0.0000 S11 -0.0015 0.0004 -0.0001 0.0000 0.0000 S12 -0.0010 0.0003 0.0000 0.0000 0.0000 S13 -0.0020 0.0004 -0.0001 0.0000 0.0000 S14 0.0001 0.0000 0.0000 0.0000 0.0000

Table 6 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the third embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional curvature of the image plane and the sagittal image plane curvature; the distortion curve represents the distortion magnitude corresponding to different field angles. It can be seen from Table 6 that the optical imaging system 10 given in the third embodiment can achieve good imaging quality.

Fourth Embodiment

Referring to FIGS. 8 and 9 , the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with positive inflection power, a second lens L2 with positive inflection power, The third lens L3 with negative inflection power, the fourth lens L4 with positive inflection power, the fifth lens L5 with negative inflection power, the sixth lens L6 with positive inflection power, the seventh lens L7 with negative inflection power, and the IR cut filter L8.

The object side S1 of the first lens L1 is convex at the near optical axis, the image side S2 of the first lens L1 is concave at the near optical axis, the object side S3 of the second lens L2 is convex at the near optical axis, and the second lens L2 is convex at the near optical axis. The image side S4 of the lens L2 is convex at the near optical axis, the object side S5 of the third lens L3 is concave at the near optical axis, the image side S6 of the third lens L3 is concave at the near optical axis, and the fourth lens L4 is concave. The object side S7 is convex at the near optical axis, the image side S8 of the fourth lens L4 is concave at the near optical axis, the object side S9 of the fifth lens L5 is concave at the near optical axis, and the image of the fifth lens L5 is concave at the near optical axis. The side S10 is convex at the near optical axis, the object side S11 of the sixth lens L6 is convex at the near optical axis, the image side S12 of the sixth lens L6 is concave at the near optical axis, and the object side S13 of the seventh lens L7 It is concave at the near optical axis, and the image side S14 of the seventh lens L7 is convex at the near optical axis.

The object side S1 of the first lens L1 is convex near the circumference, the image side S2 of the first lens L1 is convex near the circumference, the object side S3 of the second lens L2 is convex near the circumference, and the object side S3 of the second lens L2 is convex near the circumference. The image side S4 is concave at the near circumference, the object side S5 of the third lens L3 is concave at the near circumference, the image side S6 of the third lens L3 is concave at the near circumference, and the object side S7 of the fourth lens L4 is near the circumference. The circumference is concave, the image side S8 of the fourth lens L4 is convex at the near circumference, the object side S9 of the fifth lens L5 is concave at the near circumference, and the image side S10 of the fifth lens L5 is convex at the near circumference, The object side S11 of the sixth lens L6 is concave at the near circumference, the image side S12 of the sixth lens L6 is concave at the near circumference, the object side S13 of the seventh lens L7 is convex at the near circumference, and the seventh lens L7 has a convex surface. The image side S14 is convex near the circumference.

When the optical imaging system 10 is used for imaging, the light emitted or reflected by the object enters the optical imaging system 10 from the object side direction, and passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 in sequence , the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut filter L8, and finally converge on the image plane S17.

Table 7 shows a table of characteristics of the optical imaging system 10 of the present embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and Abbe number are all 587.56 nm, and the units of Y radius, thickness and focal length are all 587.56 nm. in millimeters (mm).

Form 7

Among them, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side S1 of the first lens L1 to the optical imaging system 10. The distance of the image plane S17 on the optical axis.

In this embodiment, 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 aspherical surfaces, and the surface of each spherical lens is Type Z can be defined using, but not limited to, the following aspheric formula.

where Z is the longitudinal distance between any point on the aspheric surface and the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the reciprocal of the radius of curvature), k is the conic constant, and Ai is the i-th aspheric surface For the correction coefficients of the order, Table 8 shows the coefficients K, A4, A6, A8, A10, .

Form 8

face number K A4 A6 A8 A10 S1 -0.7265 0.0014 -0.0002 0.0003 -0.0002 S2 -5.2256 -0.0059 0.0011 -0.0004 0.0003 S3 0.4891 -0.0102 0.0007 0.0000 0.0001 S4 -38.0000 -0.0233 0.0196 -0.0106 0.0035 S5 10.0000 -0.0358 0.0340 -0.0177 0.0039 S6 0.5963 -0.0211 0.0191 -0.0103 0.0041

S7 -38.0000 -0.0148 -0.0060 -0.0007 0.0065 S8 0.0000 -0.0088 -0.0110 0.0084 -0.0071 S9 -37.4368 -0.0108 -0.0068 0.0126 -0.0147 S10 -3.4610 -0.0362 0.0027 0.0061 -0.0059 S11 7.7620 -0.0353 -0.0087 0.0068 -0.0032 S12 -38.0000 0.0045 -0.0158 0.0067 -0.0020 S13 -8.3306 -0.0186 -0.0014 0.0002 0.0005 S14 -17.5480 -0.0102 -0.0024 0.0013 -0.0003 face number A12 A14 A16 A18 A20 S1 0.0001 0.0000 0.0000 0.0000 0.0000 S2 -0.0001 0.0000 0.0000 0.0000 0.0000 S3 0.0000 0.0000 0.0000 0.0000 0.0000 S4 -0.0007 0.0001 0.0000 0.0000 0.0000 S5 0.0007 -0.0007 0.0002 0.0000 0.0000 S6 -0.0022 0.0016 -0.0008 0.0002 0.0000 S7 -0.0078 0.0051 -0.0018 0.0004 0.0000 S8 0.0048 -0.0022 0.0007 -0.0001 0.0000 S9 0.0101 -0.0046 0.0013 -0.0002 0.0000 S10 0.0030 -0.0010 0.0002 0.0000 0.0000 S11 0.0012 -0.0003 0.0001 0.0000 0.0000 S12 0.0005 -0.0001 0.0000 0.0000 0.0000 S13 -0.0004 0.0001 0.0000 0.0000 0.0000 S14 0.0001 0.0000 0.0000 0.0000 0.0000

Table 8 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the fourth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional curvature of the image plane and the sagittal image plane curvature; the distortion curve represents the distortion magnitude corresponding to different field angles. It can be seen from Table 8 that the optical imaging system 10 given in the fourth embodiment can achieve good imaging quality.

Fifth Embodiment

Referring to FIGS. 10 and 11 , the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with a positive refractive power, a second lens L2 with a positive refractive power, The third lens L3 with negative inflection power, the fourth lens L4 with negative inflection power, the fifth lens L5 with positive inflection power, the sixth lens L6 with positive inflection power, the seventh lens L7 with negative inflection power, and the IR cut filter L8.

The object side S1 of the first lens L1 is convex at the near optical axis, the image side S2 of the first lens L1 is concave at the near optical axis, the object side S3 of the second lens L2 is convex at the near optical axis, and the second lens L2 is convex at the near optical axis. The image side S4 of the lens L2 is convex at the near optical axis, the object side S5 of the third lens L3 is convex at the near optical axis, the image side S6 of the third lens L3 is concave at the near optical axis, and the fourth lens L4 The object side S7 is concave at the near optical axis, the image side S8 of the fourth lens L4 is convex at the near optical axis, the object side S9 of the fifth lens L5 is convex at the near optical axis, and the image of the fifth lens L5 is convex at the near optical axis. The side S10 is convex at the near optical axis, the object side S11 of the sixth lens L6 is convex at the near optical axis, the image side S12 of the sixth lens L6 is concave at the near optical axis, and the object side S13 of the seventh lens L7 The image side surface S14 of the seventh lens L7 is concave at the near optical axis.

The object side S1 of the first lens L1 is convex near the circumference, the image side S2 of the first lens L1 is convex near the circumference, the object side S3 of the second lens L2 is convex near the circumference, and the object side S3 of the second lens L2 is convex near the circumference. The image side S4 is concave at the near circumference, the object side S5 of the third lens L3 is concave at the near circumference, the image side S6 of the third lens L3 is concave at the near circumference, and the object side S7 of the fourth lens L4 is near the circumference. The circumference is concave, the image side S8 of the fourth lens L4 is convex at the near circumference, the object side S9 of the fifth lens L5 is concave at the near circumference, and the image side S10 of the fifth lens L5 is convex at the near circumference, The object side S11 of the sixth lens L6 is concave at the near circumference, the image side S12 of the sixth lens L6 is concave at the near circumference, the object side S13 of the seventh lens L7 is convex at the near circumference, and the seventh lens L7 has a convex surface. The image side S14 is convex near the circumference.

When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut filter L8, and finally converge on the image plane S17.

Table 9 is a table showing the characteristics of the optical imaging system 10 of the present embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and Abbe number are all 587.56 nm, and the units of Y radius, thickness and focal length are all 587.56 nm. in millimeters (mm).

Form 9

Among them, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side S1 of the first lens L1 to the optical imaging system 10. The distance of the image plane S17 on the optical axis.

In this embodiment, 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 aspherical surfaces, and the surface of each spherical lens is Type Z can be defined using, but not limited to, the following aspheric formula.

where Z is the longitudinal distance between any point on the aspheric surface and the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the conic constant, and Ai is the i-th aspheric surface Correction coefficients of orders, Table 10 shows the coefficients K, A4, A6, A8, A10 .

Form 10

face number K A4 A6 A8 A10 S1 -0.7137 0.0017 0.0000 0.0001 -0.0001 S2 -4.7807 -0.0208 0.0188 -0.0130 0.0071 S3 0.4907 -0.0248 0.0192 -0.0135 0.0076 S4 -36.8699 -0.0117 -0.0001 0.0087 -0.0083 S5 14.4041 -0.0238 0.0001 0.0170 -0.0175 S6 0.6964 -0.0122 -0.0009 0.0088 -0.0071 S7 -18.0808 -0.0084 -0.0167 0.0148 -0.0135 S8 0.0000 -0.0094 -0.0148 0.0120 -0.0094 S9 -34.8114 -0.0102 -0.0068 0.0056 -0.0038 S10 -18.8606 -0.0180 -0.0046 0.0060 -0.0041 S11 11.5335 -0.0207 -0.0081 0.0026 -0.0006 S12 -37.9804 -0.0144 0.0033 -0.0068 0.0043 S13 2.2128 -0.0963 0.0523 -0.0247 0.0089 S14 -18.0418 -0.0468 0.0191 -0.0067 0.0018 face number A12 A14 A16 A18 A20

S1 0.0000 0.0000 0.0000 0.0000 0.0000 S2 -0.0027 0.0007 -0.0001 0.0000 0.0000 S3 -0.0030 0.0008 -0.0001 0.0000 0.0000 S4 0.0041 -0.0012 0.0002 0.0000 0.0000 S5 0.0095 -0.0030 0.0006 -0.0001 0.0000 S6 0.0022 0.0004 -0.0005 0.0001 0.0000 S7 0.0097 -0.0047 0.0016 -0.0003 0.0000 S8 0.0063 -0.0030 0.0010 -0.0002 0.0000 S9 0.0015 -0.0003 0.0000 0.0000 0.0000 S10 0.0018 -0.0005 0.0001 0.0000 0.0000 S11 0.0003 -0.0001 0.0000 0.0000 0.0000 S12 -0.0015 0.0003 0.0000 0.0000 0.0000 S13 -0.0023 0.0004 -0.0001 0.0000 0.0000 S14 -0.0004 0.0001 0.0000 0.0000 0.0000

Table 10 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the fifth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional curvature of the image plane and the sagittal image plane curvature; the distortion curve represents the distortion magnitude corresponding to different field angles. According to Table 10, it can be seen that the optical imaging system 10 provided in the fifth embodiment can achieve good imaging quality.

Sixth Embodiment

Referring to FIGS. 12 and 13 , the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with positive inflection power, a second lens L2 with positive inflection power, The third lens L3 with negative inflection power, the fourth lens L4 with negative inflection power, the fifth lens L5 with positive inflection power, the sixth lens L6 with positive inflection power, the seventh lens L7 with negative inflection power, and the IR cut filter L8.

The object side S1 of the first lens L1 is convex at the near optical axis, the image side S2 of the first lens L1 is concave at the near optical axis, the object side S3 of the second lens L2 is convex at the near optical axis, and the second lens L2 is convex at the near optical axis. The image side S4 of the lens L2 is concave at the near optical axis, the object side S5 of the third lens L3 is convex at the near optical axis, the image side S6 of the third lens L3 is concave at the near optical axis, and the fourth lens L4 The object side S7 is concave at the near optical axis, the image side S8 of the fourth lens L4 is concave at the near optical axis, the object side S9 of the fifth lens L5 is convex at the near optical axis, and the image of the fifth lens L5 is concave at the near optical axis. The side S10 is concave at the near optical axis, the object side S11 of the sixth lens L6 is convex at the near optical axis, the image side S12 of the sixth lens L6 is concave at the near optical axis, and the object side S13 of the seventh lens L7 The image side surface S14 of the seventh lens L7 is concave at the near optical axis.

The object side S1 of the first lens L1 is concave at the near circumference, the image side S2 of the first lens L1 is convex at the near circumference, the object side S3 of the second lens L2 is concave at the near circumference, and the second lens L2 is concave at the near circumference. The image side S4 is convex near the circumference, the object side S5 of the third lens L3 is convex near the circumference, the image side S6 of the third lens L3 is concave near the circumference, and the object side S7 of the fourth lens L4 is near the circumference. The circumference is concave, the image side S8 of the fourth lens L4 is convex at the near circumference, the object side S9 of the fifth lens L5 is concave at the near circumference, and the image side S10 of the fifth lens L5 is convex at the near circumference, The object side S11 of the sixth lens L6 is concave at the near circumference, the image side S12 of the sixth lens L6 is concave at the near circumference, the object side S13 of the seventh lens L7 is convex at the near circumference, and the seventh lens L7 has a convex surface. The image side S14 is concave near the circumference.

When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut filter L8, and finally converge on the image plane S17.

Table 11 is a table showing the characteristics of the optical imaging system 10 of the present embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and Abbe number are all 587.56 nm, and the units of Y radius, thickness and focal length are all 587.56 nm. in millimeters (mm).

Form 11

Among them, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side S1 of the first lens L1 to the optical imaging system 10. The distance of the image plane S17 on the optical axis.

In this embodiment, 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 aspherical surfaces, and the surface of each spherical lens is Type Z is available but not limited to the following aspherical male

where Z is the longitudinal distance between any point on the aspheric surface and the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the conic constant, and Ai is the i-th aspheric surface For the correction coefficients of the order, Table 12 shows the coefficients K, A4, A6, A8, A10, .

Form 12

face number K A4 A6 A8 A10 S1 -0.7178 0.0016 0.0000 0.0000 0.0000 S2 -4.7588 -0.0148 0.0124 -0.0070 0.0027 S3 0.5147 -0.0183 0.0130 -0.0078 0.0035 S4 -18.0000 -0.0246 0.0078 0.0073 -0.0102 S5 17.8823 -0.0306 0.0063 0.0129 -0.0151 S6 0.8223 -0.0067 -0.0023 0.0099 -0.0101 S7 -18.0000 -0.0110 -0.0075 0.0020 0.0009 S8 0.0000 -0.0157 -0.0069 0.0053 -0.0056 S9 -38.0000 -0.0134 -0.0006 -0.0002 -0.0004 S10 -23.4610 -0.0231 0.0027 -0.0004 -0.0006 S11 11.7062 -0.0286 0.0009 -0.0029 0.0017 S12 -37.9613 -0.0198 0.0089 -0.0086 0.0044 S13 -4.1357 -0.0888 0.0480 -0.0232 0.0086 S14 -17.5480 -0.0406 0.0160 -0.0060 0.0017 face number A12 A14 A16 A18 A20 S1 0.0000 0.0000 0.0000 0.0000 0.0000 S2 -0.0007 0.0001 0.0000 0.0000 0.0000 S3 -0.0011 0.0002 0.0000 0.0000 0.0000 S4 0.0062 -0.0022 0.0005 -0.0001 0.0000 S5 0.0088 -0.0032 0.0007 -0.0001 0.0000 S6 0.0064 -0.0027 0.0007 -0.0001 0.0000 S7 -0.0017 0.0013 -0.0005 0.0001 0.0000 S8 0.0046 -0.0024 0.0008 -0.0001 0.0000 S9 0.0001 0.0000 0.0000 0.0000 0.0000 S10 0.0005 -0.0002 0.0001 0.0000 0.0000 S11 -0.0005 0.0000 0.0000 0.0000 0.0000

S12 -0.0013 0.0003 0.0000 0.0000 0.0000 S13 -0.0023 0.0004 -0.0001 0.0000 0.0000 S14 -0.0003 0.0001 0.0000 0.0000 0.0000

Table 12 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the sixth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical imaging system 10 ; The astigmatism curve represents the meridional curvature of the image plane and the sagittal image plane curvature; the distortion curve represents the distortion magnitude corresponding to different field angles. According to Table 12, it can be seen that the optical imaging system 10 provided in the sixth embodiment can achieve good imaging quality.

Table 13 shows TTL/Imgh, f12/f, TTL/f, f1_2/f3_7, FNO, (L72p1-L72p2)/L72c, Imgh/tan (HFOV) in the optical imaging systems of the first to sixth embodiments ) and the value of ct1/et1.

Form 13

  TTL/Imgh TTL/f f1_2/f3_7 FNO first embodiment 2.51 1.12 -1.05 1.36 Second Embodiment 2.51 1.13 -1.12 1.42 Third Embodiment 2.51 1.13 -1.09 1.52 Fourth Embodiment 2.51 1.13 -1.22 1.62 Fifth Embodiment 2.47 1.11 -1.20 1.72 Sixth Embodiment 2.48 1.12 -1.15 1.55   (L72p1-L72p2)/L72c Imgh/tan(HFOV)(mm) ct1/et1   first embodiment 0.71 8.11 2.98   Second Embodiment 1.81 8.01 2.32   Third Embodiment 0.65 8.03 2.09   Fourth Embodiment 0.86 8.03 1.83   Fifth Embodiment 0.61 8.03 1.71   Sixth Embodiment 0.65 8.02 2.01  

Referring to FIG. 14 , the optical imaging system 10 of the embodiment of the present invention can be applied to the imaging module 100 of the embodiment of the present invention. The imaging module 100 includes the photosensitive element 20 and the optical imaging system 10 of any of the above embodiments. The photosensitive element 20 is provided on the image side of the optical imaging system 10 .

The photosensitive element 20 can be a complementary metal oxide semiconductor (CMOS, Complementary Metal Oxide Semiconductor) image sensor or a charge-coupled device (CCD, Charge-coupled Device).

The optical imaging system 10 in the above-mentioned imaging module 100, while satisfying the miniature design, increases the focal length, the field of view angle is smaller than that of the conventional optical imaging system, improves the relative brightness, and can achieve clear imaging even when shooting in a dark environment It can also be used to shoot distant scenes, enhance the magnification, and has functions such as blurring the background and highlighting the subject.

Please continue to refer to FIG. 14 , the image capturing module 100 of the embodiment of the present invention can be applied to the electronic device 1000 of the embodiment of the present invention. The electronic device 1000 includes a casing 200 and an imaging module 100 , and the imaging module 100 is installed on the casing 200 .

The electronic device 1000 of the embodiment of the present invention can be applied to vehicle-mounted, automatic driving and monitoring devices, wherein the electronic device 1000 includes but is not limited to a driving recorder, a smart phone, a tablet computer, a notebook computer, an electronic book reader, and a portable multimedia player (PMP), portable phones, video phones, digital still cameras, mobile medical devices, wearable devices and other electronic devices that support imaging.

The optical imaging system 10 in the above-mentioned electronic device 1000, while satisfying the miniature design, increases the focal length, the field of view angle is smaller than that of the conventional optical imaging system, the relative brightness is improved, and a clear imaging effect can be achieved even when shooting in a dark environment. It can also be used to shoot distant scenes, with increased magnification, and has functions such as blurring the background and highlighting the subject.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the appended claims. All changes within the meaning and range of the equivalents of , are included in the present invention.

Claims (10)

An optical imaging system, characterized in that, from the object side to the image side, it comprises: The first lens with positive bending power, the object side of the first lens is convex at the near-optical axis, and the image side is concave at the near-optical axis; a second lens with positive bending power, the object side of the second lens is convex at the near optical axis; a third lens with negative bending power, the image side surface of the third lens is concave at the near optical axis; a fourth lens having a bending force; a fifth lens with a bending force; a sixth lens having a bending power; and a seventh lens with negative tortuosity; The optical imaging system satisfies the following conditional formula: 0.5<(L72p1-L72p2)/L72c; Wherein, L72c represents the maximum effective aperture in the direction perpendicular to the optical axis when the central beam passes through the image side surface of the seventh lens, and the central beam is the beam incident on the center of the imaging plane of the optical imaging system; L72p1 represents the maximum vertical distance from the intersection of the edge beam and the image side of the seventh lens to the optical axis, L72p2 represents the minimum vertical distance from the intersection of the edge beam and the image side of the seventh lens to the optical axis, and the edge beam is The light beam that is incident on the imaging plane of the optical imaging system at the point farthest from the optical axis. The optical imaging system of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens and the seventh lens is aspherical. The optical imaging system according to claim 1, wherein the optical imaging system satisfies the following conditional formula: TTL/Imgh<2.7; Wherein, TTL is the distance from the object side of the first lens to the image plane of the optical imaging system on the optical axis, and Imgh is the image height corresponding to half of the maximum angle of view of the optical imaging system. The optical imaging system according to claim 1, wherein the optical imaging system satisfies the following conditional formula: TTL/f<1.2; Wherein, TTL is the distance from the object side of the first lens to the image plane of the optical imaging system on the optical axis, and f is the effective focal length of the optical imaging system. The optical imaging system according to claim 1, wherein the optical imaging system satisfies the following conditional formula: -1.7<f1_2/f3_7<-0.5; Wherein, f1_2 is the combined focal length of the first lens to the second lens; f3_7 is the combined focal length of the third lens to the seventh lens. The optical imaging system according to claim 1, wherein the optical imaging system satisfies the following conditional formula: FNO<1.9; Wherein, FNO is the aperture number of the optical imaging system. The optical imaging system according to claim 1, wherein the optical imaging system satisfies the following conditional formula: Imgh/tan(HFOV)>6mm; Wherein, Imgh is the image height corresponding to half of the maximum angle of view of the optical imaging system, and HFOV is half of the maximum angle of view of the optical imaging system. The optical imaging system according to claim 1, wherein the optical imaging system satisfies the following conditional formula: ct1/et1<3.5; Wherein, ct1 is the thickness of the first lens along the optical axis, and et1 is the edge thickness of the first lens along the optical axis. An imaging module, comprising: The optical imaging system of any one of claims 1 to 8; and A photosensitive element, the photosensitive element is arranged on the image side of the optical imaging system. An electronic device, comprising: the shell; and The imaging module according to claim 9, wherein the imaging module is mounted on the casing.

Images