CN115453711A - Optical imaging system, image capturing module and electronic device - Google Patents

Abstract

The application discloses optical imaging system, get for instance module and electron device. The optical imaging system sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side, and the optical imaging system meets the following conditional expression: SD11<0.67mm，85°<FOV<95°；2.6<TL1/EPD<2.85；18mm ^‑1 <V1/Imgh<19.5mm ^‑1 ；TTL<4mm; SD11 is the effective half diameter of the object side surface of the first lens, FOV is the maximum field angle of the optical imaging system, TL1 is the distance between the object side surface of the first lens and the imaging surface of the optical imaging system on the optical axis, the diameter of the entrance pupil of the EPD optical imaging system, V1 is the dispersion coefficient of the first lens, imgh is half of the image height corresponding to the maximum field angle of the optical imaging system, and TTL is the total length of the optical imaging system. The above opticsThe imaging system has a telescopic characteristic, has a small total length in a field angle range in a conditional expression, is beneficial to realizing miniaturization, and can be applied to a high-quality miniaturized lens, and the imaging height is at least 2.9mm.

Description

Optical imaging system, image capturing module and electronic device

Technical Field

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

Background

In recent years, with the rapid development of miniaturized camera lenses, the demand of a micro image capturing module is increasing, and the photosensitive elements of a common camera lens are usually two types of photosensitive coupling elements (CCD) or Complementary Metal-Oxide Semiconductor (CMOS) elements, and with the refinement of the Semiconductor manufacturing technology, the pixel size of the photosensitive elements is reduced, and in addition, the current electronic products are developed with a good function and a light, thin, short and small shape, so that the miniaturized camera lens with good imaging quality is a mainstream in the current market.

For an optical system composed of five-piece lenses in the prior art, the refractive power configuration closest to the object side end and the image side end cannot effectively exert the telescopic characteristic of the optical imaging system, so that the effect of shortening the back focal length of the optical imaging system is limited, the total length is larger, and the off-axis aberration of the optical imaging system is not corrected well, so that the optical imaging system is not easy to be applied to high-quality miniaturized lenses.

Disclosure of Invention

In view of the above, it is desirable to provide an optical imaging system, an image capturing module and an electronic device to solve the above problems.

Embodiments of the present application provide an optical imaging system, in order from an object side to an image side:

a first lens element having a convex object-side surface and a convex image-side surface at a paraxial region;

a second lens element having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a third lens element having a concave image-side surface at a paraxial region;

a fourth lens element having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; and

a fifth lens element having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the optical imaging system satisfies the following conditional expression:

SD11<0.67mm，85°<FOV<95°；2.6<TL1/EPD<2.85；18mm ^-1 <V1/Imgh<19.5mm ^-1 ；TTL<4mm; the optical imaging system comprises a first lens, a second lens, an optical imaging system, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an effective half diameter of the object side surface of the first lens, an effective field of view (FOV) of the optical imaging system, a distance between the object side surface of the first lens and an imaging surface of the optical imaging system on an optical axis, an entrance pupil diameter of the optical imaging system, a chromatic dispersion coefficient of the first lens, imgh is half of an image height corresponding to the maximum field of view of the optical imaging system, and TTL is a total length of the optical imaging system.

The optical imaging system has the telescopic characteristic, has smaller total length in the field angle range in the conditional expression, is beneficial to realizing miniaturization, and off-axis aberration can be corrected better, so that the optical imaging system can be applied to high-quality miniaturized lenses, and the imaging height is at least 2.9mm.

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

0.9<|RS7+RS8|/|RS7-RS8|<1.3；

wherein RS7 is a curvature radius of an object-side surface of the fourth lens element at a paraxial region, and RS8 is a curvature radius of an image-side surface of the fourth lens element at a paraxial region.

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

1.17<(V2+V3+V5)/(V1+V4)<1.85；

wherein V2 is an abbe number of the second lens, V3 is an abbe number of the third lens, and V4 is an abbe number of the fourth lens.

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

39.9°/mm<FOV/f<40.3°/mm；

wherein f is the effective focal length of the optical imaging system.

In some embodiments, the optical imaging system satisfies the following relationship:

36.2≤vd1-vd2≤36.8；

wherein vd1 is the abbe number of the first lens, and vd2 is the abbe number of the second lens.

In some embodiments, the optical imaging system satisfies the following relationship:

1.05<SD22/SD12<1.3；

wherein SD22 is an effective half diameter of the image-side surface of the second lens, and SD12 is an effective half diameter of the image-side surface of the first lens.

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

0.17<R5/CT3<0.92；

wherein R5 is a curvature radius of the object-side surface of the third lens element at a paraxial region, and CT3 is a distance on the optical axis from the object-side surface of the third lens element to the image-side surface of the third lens element.

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

21.5mm ^-1 ≤MVd/f≤22.1mm ^-1 ；

wherein MVd is the average value of Abbe numbers of the five lenses, and f is the effective focal length of the optical imaging system.

The embodiment of the application has still provided a get for instance module, includes:

the optical imaging system described above; and

a photosensitive element disposed on an image side of the optical imaging system.

The image capturing module comprises the optical imaging system, has a telescopic characteristic, has smaller total length in a field angle range in a conditional expression, is beneficial to realizing miniaturization, can better correct off-axis aberration thereof, and can be applied to high-quality miniaturized lenses, and the imaging height is at least 2.9mm.

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

a housing; and

like above-mentioned get for instance the module, get for instance the module and install on the casing.

The electronic device comprises an image capturing module, wherein an optical imaging system in the image capturing module has a telescopic characteristic, has a smaller total length in a field angle range in a conditional expression, is beneficial to realizing miniaturization, and off-axis aberration of the optical imaging system can be corrected better, so that the optical imaging system can be applied to a high-quality miniaturized lens, and the imaging height is at least 2.9mm.

Drawings

Fig. 1 is a structural diagram of an optical imaging system of a first embodiment of the present application.

Fig. 2 is a graph of simulated MTF versus field angle performance data for an optical imaging system of a first embodiment of the present application.

Fig. 3 is a field curvature graph of the optical imaging system of the first embodiment of the present application.

Fig. 4 is a distortion graph of the optical imaging system of the first embodiment of the present application.

Fig. 5 is a structural diagram of an optical imaging system of a second embodiment of the present application.

Fig. 6 is a graph of simulated MTF versus field angle performance data for an optical imaging system of a second embodiment of the present application.

Fig. 7 is a field curvature graph of an optical imaging system of a second embodiment of the present application.

Fig. 8 is a distortion plot of an optical imaging system of a second embodiment of the present application.

Fig. 9 is a structural view of an optical imaging system of a third embodiment of the present application.

Fig. 10 is a graph of simulated MTF viewing angle performance data for an optical imaging system according to a third embodiment of the present application.

Fig. 11 is a field curvature graph of an optical imaging system of a third embodiment of the present application.

Fig. 12 is a distortion graph of an optical imaging system of the third embodiment of the present application.

Fig. 13 is a schematic structural diagram of an image capturing module according to an embodiment of the present application.

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

Description of the main elements

Image capturing module 100

Optical imaging system 10

First lens L1

Second lens L2

Third lens L3

Fourth lens L4

Fifth lens L5

Optical filter L6

Imaging plane IMA

Photosensitive element 20

Electronic device 200

Case 210

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

Referring to fig. 1, an optical imaging system 10 includes, in order from an object side to an image side, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4 and a fifth lens element L5. It is understood that each lens may be made of plastic, glass, or at least one lens may be made of plastic and at least one lens may be made of glass.

The first lens L1 has an object-side surface S1 and an image-side surface S2, the second lens L2 has an object-side surface S3 and an image-side surface S4, the third lens L3 has an object-side surface S5 and an image-side surface S6, the fourth lens L4 has an object-side surface S7 and an image-side surface S8, and the fifth lens L5 has an object-side surface S9 and an image-side surface S10.

The object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex at the paraxial region. The object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 of the second lens element L2 is concave at the paraxial region. The object-side surface S5 of the third lens L3 is concave at the paraxial region. The object-side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is convex at the paraxial region. The object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is concave at the paraxial region.

The optical imaging system satisfies the following conditional expression:

SD11<0.67mm，85°<FOV<95°；2.6<TL1/EPD<2.85；18mm ^-1 <V1/Imgh<19.5mm ^-1 ；TTL<4mm; wherein SD11 is an effective half diameter of the object-side surface S1 of the first lens L1, FOV is a maximum field angle of the optical imaging system 10, TL1 is a distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface IMA of the optical imaging system 10, EPD is an entrance pupil diameter of the optical imaging system 10, V1 is an abbe number of the first lens L1, imgh is a half of an image height corresponding to the maximum field angle of the optical imaging system 10, and TTL is a total length of the optical imaging system 10.

The optical imaging system 10 of the present application has a telescopic characteristic, has a small total length in a field angle range in a conditional expression, is beneficial to realizing miniaturization, and can realize better correction of off-axis aberration thereof, so that the optical imaging system can be applied to high-quality miniaturized lenses, and the imaging height is at least 2.9mm.

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

0.9<|RS7+RS8|/|RS7-RS8|<1.3；

wherein RS7 is a curvature radius of the object-side surface S7 of the fourth lens element L4 at a paraxial region, and RS8 is a curvature radius of the image-side surface S8 of the fourth lens element L4 at a paraxial region.

As such, the radius of curvature of the fourth lens L4 may affect the degree of curvature of the fourth lens L4; when the above conditional expressions are satisfied, the edge aberration of the optical imaging system 10 can be effectively corrected, the occurrence of astigmatism is suppressed, and the angle at which the principal rays of the peripheral angle of view enter the imaging plane IMA is reduced.

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

1.17<(V2+V3+V5)/(V1+V4)<1.85；

wherein V2 is an abbe number of the second lens L2, V3 is an abbe number of the third lens L3, and V4 is an abbe number of the fourth lens L4.

Thus, a good balance can be obtained between the chromatic aberration correction and the astigmatism correction.

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

39.9°/mm<FOV/f<40.3°/mm；

where f is the effective focal length of the optical imaging system 10.

Therefore, the optical imaging system 10 can be effectively controlled to achieve the purpose of short overall length under the condition of meeting the appropriate effective focal length, and the requirement of thinning the optical imaging system 10 is met.

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

36.2≤vd1-vd2≤36.8；

wherein vd1 is the abbe number of the first lens L1, and vd2 is the abbe number of the second lens L2.

Therefore, the lens material is reasonably selected, the chromatic aberration of the optical imaging system 10 can be effectively corrected, the imaging definition of the optical imaging system 10 is improved, and the imaging quality of the optical imaging system 10 is improved.

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

1.05<SD22/SD12<1.3；

wherein SD22 is an effective half diameter of the image-side surface S4 of the second lens L2, and SD12 is an effective half diameter of the image-side surface S2 of the first lens L1.

When the above relation is satisfied, the front end aperture size of the optical imaging system 10 is reduced, and miniaturization is achieved.

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

0.17<R5/CT3<0.92；

where R5 is a curvature radius of the object-side surface S5 of the third lens element L3 at a paraxial region, and CT3 is a distance from the object-side surface S5 of the third lens element L3 to the image-side surface S6 of the third lens element L3 on the optical axis.

By satisfying the limitation of the conditional expression, the light can be converged further, the L3 surface of the third lens is smooth, and the deviation of the incident angle and the emergent angle of the light with different fields can be reduced, so that the sensitivity is reduced; and the thicker third lens L3 can reduce the processing difficulty, reduce the sensitivity of thickness tolerance and improve the yield.

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

21.5mm ^-1 ≤MVd/f≤22.1mm ^-1 ；

wherein MVd is an average value of abbe numbers of the five lenses L5, and f is an effective focal length of the optical imaging system 10.

Therefore, chromatic aberration can be balanced, the high Abbe number and the low Abbe number correspond to different refractive indexes, the long-focus function can be realized through combination of different materials, and the optical imaging performance is improved.

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

15°/mm<FOV/TTL<28.5°/mm；

wherein, TTL is a distance between the object side surface S1 of the first lens element L1 and the imaging surface IMA of the optical imaging system 10 on the optical axis.

In this manner, the optical imaging system 10 can be made to have a smaller overall length while having a larger field angle.

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

1.3<TTL/Imgh<2.7；

wherein, TTL is a distance between the object side surface S1 of the first lens element L1 and the imaging surface IMA of the optical imaging system 10 on the optical axis.

Satisfying the above relation, the optical imaging system 10 can be made to have an ultra-thin characteristic, and a demand for miniaturization can be achieved. However, if TTL/Imgh does not satisfy the above relational expression, the total length of the optical imaging system 10 is large, which is disadvantageous for the demand for miniaturization.

In some embodiments, the optical imaging system 10 further includes a filter L6, the filter L6 has an object side surface S11 and an image side surface S12, the filter L6 is disposed between the image side surface S10 of the fifth lens L5 and the imaging surface IMA, and the filter L6 may be an infrared filter to filter out light in other bands, such as visible light, and only let infrared light pass through, so that the optical imaging system 10 can also image in a dark environment and other special application scenes. It is understood that the material of the filter L6 may be plastic or glass.

First embodiment

Referring to fig. 1, the optical imaging system 10 in the embodiment includes, from an object side to an image side, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a filter L6.

The object-side surface S1 and the image-side surface S2 of the first lens L1 are both convex at the paraxial region. The object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 of the second lens element L2 is concave at the paraxial region. The object-side surface S5 of the third lens element L3 is concave at the paraxial region, and the image-side surface S6 of the third lens element L4 is concave at the paraxial region. The object-side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is convex at the paraxial region. The object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is concave at the paraxial region.

When the optical imaging system 10 is used for imaging, light emitted or reflected by a subject enters the optical imaging system 10 from the object side direction, sequentially passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the optical filter L6, and finally converges on the imaging plane IMA.

Table 1 shows characteristics of the optical imaging system 10 of the present embodiment, where f is an effective focal length of the optical imaging system 10, FOV is a maximum angle of view of the optical imaging system 10, reference wavelengths of the effective focal length, refractive index, and abbe number are 550nm, and units of the radius of curvature, thickness, and half diameter are millimeters (mm).

TABLE 1

TABLE 2

It should be noted that, the object-side surface and the image-side surface of the first lens L1 to the second lens L5 of the optical imaging system 10 are aspheric surfaces, and the conic constant k and the aspheric coefficient corresponding to each aspheric surface are shown in table 2, and for these aspheric surfaces, the aspheric equation of the aspheric surface is:

wherein Z represents a height in parallel with a Z axis in the lens surface, r represents a radial distance from a vertex, c represents a curvature of a surface at the vertex, K represents a conic constant, and K2, K4, K6, K8, K10, K12, K14, and K16 represent aspheric coefficients of orders corresponding to orders of 2, 4, 6, 8, 10, 12, 14, and 16, respectively.

Fig. 2 is a graph of simulated MTF viewing angle performance data for the optical imaging system 10 in this embodiment. Wherein the abscissa represents the Y-field offset angle, i.e., the angle that the field of view of the optical system 100 makes with respect to the optical axis, in degrees; the ordinate represents the OTF coefficient; s1 and T1 represent curves with a spatial frequency of 110cyc/mm, S2 and T2 represent curves with a spatial frequency of 220cyc/mm, and S3 and T3 represent curves with a spatial frequency of 440yc/mm; where curves S1 and T1 are curves at lower frequencies that reflect the contrast characteristics of the optical system 100, and curves S3 and T3 are curves at higher frequencies that reflect the resolution characteristics of the optical system 100.

Fig. 3 is a field curvature curve graph of the optical imaging system 10 in this embodiment, in which the wavelengths from left to right are 650nm, 610nm, 550nm, 510nm, and 470nm in sequence, and the reference wavelength is 550nm, and it can be known from the curve in fig. 3 that the sagittal field curvature value and the meridional field curvature value of the optical imaging system 10 are controlled to be between-0.1 mm and 0.1mm, so that the lens is easier to manufacture, and the manufacturing cost is reduced;

fig. 4 is a distortion curve diagram of the optical imaging system 10 in the present embodiment, and it can be known from the curve of fig. 4 that the distortion of the optical imaging system 10 is controlled within 0-2%, that is, the distortion of the image formed by the optical imaging system 10 is small.

Therefore, the optical imaging system 100 reflects a good value on the analog MTF, and the optical imaging system 10 has good imaging performance.

Second embodiment

Referring to fig. 5, the optical imaging system 10 in the embodiment includes, from an object side to an image side, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a filter L6.

The object-side surface S1 and the image-side surface S2 of the first lens L1 are both convex at the paraxial region. The object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 of the second lens element L2 is concave at the paraxial region. The object-side surface S5 of the third lens element L3 is concave at the paraxial region, and the image-side surface S6 of the third lens element L4 is concave at the paraxial region. The object-side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is convex at the paraxial region. The object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is concave at the paraxial region.

When the optical imaging system 10 is used for imaging, light emitted or reflected by a subject enters the optical imaging system 10 from the object side direction, sequentially passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the optical filter L6, and finally converges on the imaging plane IMA.

Table 3 shows the characteristics of the optical imaging system 10 of the present embodiment, where f is the effective focal length of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, the reference wavelength of the effective focal length, refractive index and abbe number is 550nm, and the units of the radius of curvature, thickness and half diameter are all millimeters (mm).

TABLE 3

TABLE 4

Fig. 6 is a graph of simulated MTF viewing angle performance data for the optical imaging system 10 in this embodiment. Wherein the abscissa represents the Y-field offset angle, i.e., the angle that the field of view of the optical system 100 makes with respect to the optical axis, in degrees; the ordinate represents the OTF coefficient; s1 and T1 represent curves with a spatial frequency of 110cyc/mm, S2 and T2 represent curves with a spatial frequency of 220cyc/mm, and S3 and T3 represent curves with a spatial frequency of 440yc/mm; where curves S1 and T1 are curves at lower frequencies that reflect the contrast characteristics of the optical system 100, and curves S3 and T3 are curves at higher frequencies that reflect the resolution characteristics of the optical system 100.

Fig. 7 is a field curvature curve graph of the optical imaging system 10 in this embodiment, in which the wavelengths from left to right are 650nm, 610nm, 550nm, 510nm, and 470nm in sequence, and the reference wavelength is 550nm, and it can be known from the curve of fig. 7 that the sagittal field curvature value and the meridional field curvature value of the optical imaging system 10 are controlled to be between-0.1 mm and 0.1mm, so that the lens is easier to manufacture, and the manufacturing cost is reduced;

fig. 8 is a distortion curve diagram of the optical imaging system 10 in the present embodiment, and it can be known from the curve of fig. 8 that the distortion of the optical imaging system 10 is controlled within 0-2%, that is, the distortion of the image formed by the optical imaging system 10 is small.

Therefore, the optical imaging system 100 has a good value in reflecting the analog MTF, and the optical imaging system 10 has good imaging performance.

Third embodiment

Referring to fig. 9, the optical imaging system 10 of the present embodiment includes, from an object side to an image side, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5 and a filter L6.

The object-side surface S1 and the image-side surface S2 of the first lens L1 are both convex at the paraxial region. The object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 of the second lens element L2 is concave at the paraxial region. The object-side surface S5 of the third lens element L3 is concave at the paraxial region, and the image-side surface S6 of the third lens element L4 is concave at the paraxial region. The object-side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is convex at the paraxial region. The object-side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is concave at the paraxial region.

When the optical imaging system 10 is used for imaging, light emitted or reflected by a subject enters the optical imaging system 10 from the object side direction, sequentially passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the optical filter L6, and finally converges on the imaging plane IMA.

Table 5 shows the characteristics of the optical imaging system 10 of the present embodiment, where f is the effective focal length of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, the reference wavelength of the effective focal length, refractive index, and abbe number is 550nm, and the units of the radius of curvature, thickness, and half diameter are millimeters (mm).

TABLE 5

TABLE 6

Fig. 10 is a graph of simulated MTF viewing angle performance data for the optical imaging system 10 in this embodiment. Wherein the abscissa represents the Y-field offset angle, i.e., the angle that the field of view of the optical system 100 makes with respect to the optical axis, in degrees; the ordinate represents the OTF coefficient; s1 and T1 represent curves with a spatial frequency of 110cyc/mm, S2 and T2 represent curves with a spatial frequency of 220cyc/mm, and S3 and T3 represent curves with a spatial frequency of 440yc/mm; where curves S1 and T1 are curves at lower frequencies that reflect the contrast characteristics of the optical system 100, and curves S3 and T3 are curves at higher frequencies that reflect the resolution characteristics of the optical system 100.

Fig. 11 is a field curvature curve graph of the optical imaging system 10 in this embodiment, in which the wavelengths from left to right are 650nm, 610nm, 550nm, 510nm, and 470nm, and the reference wavelength is 550nm, and it can be known from the curve in fig. 11 that the sagittal field curvature value and the meridional field curvature value of the optical imaging system 10 are controlled to be between-0.1 mm and 0.1mm, the lens is easier to manufacture, and the manufacturing cost is reduced;

fig. 12 is a distortion curve diagram of the optical imaging system 10 in the present embodiment, and it can be known from the curve of fig. 12 that the distortion of the optical imaging system 10 is controlled within 0-2%, that is, the distortion of the image formed by the optical imaging system 10 is small.

Therefore, the optical imaging system 100 reflects a good value on the analog MTF, and the optical imaging system 10 has good imaging performance.

Table 7 shows values of SD11, FOV, TL1/EPD, V1/Imgh, TTL, | RS7+ RS8|/| RS7-RS8|, (V2 + V3+ V5)/(V1 + V4), FOV/f, vd1-vd2, SD22/SD12, R5/CT3, MVd/f in the optical imaging systems of the first to third embodiments.

TABLE 7

Referring to fig. 13, the optical imaging system 10 of the present embodiment can be applied to the image capturing module 100 of the present embodiment. The image capturing module 100 includes a photosensitive element 20 and the optical imaging system 10 of any of the above embodiments. The photosensitive element 20 is disposed on the image side of the optical imaging system 10.

The photosensitive element 20 may be a Complementary Metal Oxide Semiconductor (MMOS) image sensor or a Charge-coupled Device (CCD).

The optical imaging system 10 in the image capturing module 100 has a telescopic characteristic, has a smaller total length in a field angle range in a conditional expression, is beneficial to realizing miniaturization, and off-axis aberration thereof can be corrected better, so that the optical imaging system can be applied to a high-quality miniaturized lens, and the imaging height is at least 2.9mm.

Referring to fig. 14, the image capturing module 100 of the present embodiment can be applied to the electronic device 200 of the present embodiment. The electronic device 200 includes a housing 210 and the image capturing module 100, wherein the image capturing module 100 is mounted on the housing 210.

The electronic device 200 of the embodiment of the present application includes, but is not limited to, an imaging-enabled electronic device such as a car recorder, a smart phone, a tablet computer, a notebook computer, an electronic book reader, a Portable Multimedia Player (PMP), a portable phone, a video phone, a digital still camera, a mobile medical device, a wearable device, an intelligent doorbell detection device, and an intelligent household appliance detection device.

The optical imaging system 10 in the electronic device 200 is a five-lens set, has a telescopic characteristic, has a smaller total length in a field angle range in a conditional expression, is beneficial to realizing miniaturization, and has better correction of off-axis aberration, so that the optical imaging system can be applied to a high-quality miniaturized lens, and the imaging height is at least 2.9mm.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (10)

1. An optical imaging system, comprising, in order from an object side to an image side:

a first lens element having a convex object-side surface and a convex image-side surface at a paraxial region;

a second lens element having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a third lens element having a concave image-side surface at a paraxial region;

a fourth lens element having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; and

a fifth lens element having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the optical imaging system satisfies the following conditional expression:

SD11<0.67mm，85°<FOV<95°；2.6<TL1/EPD<2.85；18mm ^-1 <V1/Imgh<19.5mm ^-1 ；TTL<4mm; the optical imaging system comprises a first lens, a second lens, an optical imaging system, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an effective half diameter of the object side surface of the first lens, an effective field of view (FOV) of the optical imaging system, a distance between the object side surface of the first lens and an imaging surface of the optical imaging system on an optical axis, an entrance pupil diameter of the optical imaging system, a chromatic dispersion coefficient of the first lens, imgh is half of an image height corresponding to the maximum field of view of the optical imaging system, and TTL is a total length of the optical imaging system.

2. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

0.9<|RS7+RS8|/|RS7-RS8|<1.3；

wherein RS7 is a radius of curvature of an object-side surface of the fourth lens element at a paraxial region thereof, and RS8 is a radius of curvature of an image-side surface of the fourth lens element at a paraxial region thereof.

3. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

1.17<(V2+V3+V5)/(V1+V4)<1.85；

wherein V2 is an abbe number of the second lens, V3 is an abbe number of the third lens, V4 is an abbe number of the fourth lens, and V5 is an abbe number of the fifth lens.

4. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

39.9°/mm<FOV/f<40.3°/mm；

wherein f is the effective focal length of the optical imaging system.

5. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

36.2≤vd1-vd2≤36.8；

wherein vd1 is the abbe number of the first lens, and vd2 is the abbe number of the second lens.

6. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following relationship:

1.05<SD22/SD12<1.3；

wherein SD22 is an effective half diameter of the image-side surface of the second lens, and SD12 is an effective half diameter of the image-side surface of the first lens.

7. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

0.17<R5/CT3<0.92；

wherein R5 is a curvature radius of the object-side surface of the third lens element at a paraxial region, and CT3 is a distance on the optical axis from the object-side surface of the third lens element to the image-side surface of the third lens element.

8. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:

21.5mm ^-1 ≤MVd/f≤22.1mm ^-1 ；

wherein, MVd is the average value of Abbe numbers of the five lenses, and f is the effective focal length of the optical imaging system.

9. An image capturing module, comprising:

the optical imaging system of any one of claims 1 to 8; and

a photosensitive element disposed on an image side of the optical imaging system.

10. An electronic device, comprising:

a housing; and

the image capturing module of claim 9, wherein the image capturing module is mounted on the housing.

Images