TWM596355U - Optical image capturing system - Google Patents

Abstract

The invention discloses a five-piece optical lens for capturing image and a five-piece optical module for capturing image. In order from an object side to an image side, the optical lens along the optical axis comprises a first lens with refractive power; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power; a fifth lens with refractive power; and at least one of the image-side surface and object-side surface of each of the five lens elements is aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.

Description

Optical imaging system

This creation is about an optical imaging system group, and particularly about a miniaturized optical imaging system group applied to electronic products.

In recent years, with the rise of portable electronic products with photographic functions, the demand for optical systems has been increasing. The photosensitive element of the general optical system is nothing more than a photosensitive coupled device (Charge Coupled Device; CCD) or a complementary metal oxide semiconductor device (Complementary Metal-Oxide Semiconductor Sensor; CMOS Sensor), and with the advancement of semiconductor manufacturing technology, As a result, the pixel size of the photosensitive element is reduced, and the optical system is gradually developing in the field of high pixels, so the requirements for imaging quality are also increasing.

The traditional optical systems mounted on portable devices mostly use three- or four-piece lens structures. However, as portable devices continue to improve pixels and end consumers demand large apertures such as low light and night With the shooting function, the conventional optical imaging system has been unable to meet the higher-level photography requirements.

Therefore, how to effectively increase the light input of the optical imaging lens and further improve the imaging quality has become a very important issue.

The aspect of this creative embodiment is directed to an optical imaging system and optical image capturing lens, which can use the combination of the refractive power of five lenses, convex and concave surfaces (the convex or concave surface in this creation refers to the object side of each lens in principle) Or the description of the change of the geometric shape at different heights from the side of the optical axis, so as to effectively improve the light input of the optical imaging system and improve the imaging quality at the same time, so as to be applied to small electronic products.

The terms and code names of the lens parameters related to this creative example are listed in detail below as a reference for subsequent descriptions:

Lens parameters related to length or height The imaging height of the optical imaging system is expressed by HOI; the height of the optical imaging system is expressed by HOS; the distance between the object side of the first lens of the optical imaging system and the image side of the fifth lens is expressed by InTL; the fixed diaphragm of the optical imaging system (aperture) ) The distance to the infrared imaging surface is expressed in InS; the distance between the first lens and the second lens of the optical imaging system is expressed by IN12 (exemplified); the thickness of the first lens of the optical imaging system on the optical axis is expressed by TP1 (Illustration).

Lens parameters related to materials The dispersion coefficient of the first lens of the optical imaging system is represented by NA1 (exemplified); the refraction law of the first lens is represented by Nd1 (exemplified).

Lens parameters related to viewing angle The angle of view is expressed in AF; half of the angle of view is expressed in HAF; the chief ray angle is expressed in MRA.

Lens parameters related to entrance and exit pupils The diameter of the entrance pupil of the optical imaging system is expressed by HEP; the maximum effective radius of any surface of a single lens refers to the maximum angle of view of the system. The light rays passing through the edge of the entrance pupil at the intersection point of the lens surface (Effective Half Diameter; EHD), the The vertical height between the intersection point and the optical axis. For example, the maximum effective radius of the object side of the first lens is represented by EHD11, and the maximum effective radius of the image side of the first lens is represented by EHD12. The maximum effective radius of the object side of the second lens is represented by EHD21, and the maximum effective radius of the image side of the second lens is represented by EHD22. The maximum effective radius of any surface of the remaining lenses in the optical imaging system can be expressed by analogy.

Parameters related to the depth of lens profile From the intersection of the fifth lens object side on the optical axis to the end of the maximum effective radius of the fifth lens object side, the distance between the two points above the optical axis is expressed by InRS51 (maximum effective radius depth); fifth lens image side From the point of intersection on the optical axis to the end of the maximum effective radius of the image side of the fifth lens, the distance between the aforementioned two points horizontally to the optical axis is represented by InRS52 (maximum effective radius depth). The expression of the depth of the maximum effective radius (sinking amount) of the object side or image side of other lenses is the same as the above.

Parameters related to lens profile Critical point C refers to a point on a particular lens surface, except for the intersection with the optical axis, a tangent plane perpendicular to the optical axis. For example, the vertical distance between the critical point C41 on the side of the fourth lens object and the optical axis is HVT41 (exemplified), the vertical distance between the critical point C42 on the image side of the fourth lens and the optical axis is HVT42 (exemplified), and the fifth lens object The vertical distance between the critical point C51 on the side and the optical axis is HVT51 (illustrated), and the vertical distance between the critical point C52 on the image side of the fifth lens and the optical axis is HVT52 (illustrated). The expression method of the critical point on the object side or the image side of other lenses and the vertical distance from the optical axis is as described above.

The inflection point closest to the optical axis on the object side of the fifth lens is IF511, and the amount of depression at this point is SGI511 (exemplified), that is, the intersection point of the object side of the fifth lens on the optical axis to the closest optical axis of the object side of the fifth lens The horizontal displacement distance between the inflexion point and the optical axis is parallel. The vertical distance between the point and the optical axis of IF511 is HIF511 (example). The inflection point closest to the optical axis on the image side of the fifth lens is IF521, and the amount of depression at this point is SGI521 (example), that is, the intersection of the image side of the fifth lens on the optical axis and the closest optical axis of the image side of the fifth lens The horizontal displacement distance between the inflexion point and the optical axis is parallel, and the vertical distance between the point and the optical axis of IF521 is HIF521 (illustrated).

The inflection point of the second lens on the side of the fifth lens close to the optical axis is IF512, and the amount of depression at this point is SGI512 (example), that is, the intersection point of the fifth lens on the optical axis to the second closest to the fifth lens The horizontal displacement distance between the reflex point of the optical axis and the optical axis is parallel. The vertical distance between this point and the optical axis is IF512 (illustrated). The inflection point of the second lens on the image side of the fifth lens close to the optical axis is IF522, and the amount of depression at this point is SGI522 (example), that is, the intersection of the image side of the fifth lens on the optical axis and the second closest to the image side of the fifth lens The horizontal displacement distance between the reflex point of the optical axis and the optical axis is parallel, and the vertical distance between the point and the optical axis of IF522 is HIF522 (illustrated).

The inflection point of the third approaching optical axis on the object side of the fifth lens is IF513, and the amount of depression at this point is SGI513 (example), that is, the intersection of the object side of the fifth lens on the optical axis and the third approaching of the object side of the fifth lens The horizontal displacement distance between the reflex point of the optical axis and the optical axis is parallel, and the vertical distance between this point and the optical axis is HIF513 (illustrated). The inflection point of the third near optical axis on the image side of the fifth lens is IF523, and the amount of depression at this point is SGI523 (exemplified), that is, the intersection of the image side of the fifth lens on the optical axis and the third closest to the image side of the fifth lens The horizontal displacement distance between the reflex point of the optical axis and the optical axis is parallel. The vertical distance between this point and the optical axis is IF523 (illustrated).

The fourth inflection point on the object side of the fifth lens close to the optical axis is IF514, and the amount of depression at this point is SGI514 (exemplified), that is, the intersection of the object side of the fifth lens on the optical axis and the fourth closest to the object side of the fifth lens The horizontal displacement distance between the reflex point of the optical axis and the optical axis is parallel, and the vertical distance between the point and the optical axis of IF514 is HIF514 (illustrated). The fourth inflection point on the image side of the fifth lens near the optical axis is IF524, and the amount of depression at this point is SGI524 (example), which is the intersection of the image side of the fifth lens on the optical axis to the fourth closest to the image side of the fifth lens The horizontal displacement distance between the reflex point of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of IF524 is HIF524 (illustrated).

The expressions of the inflection points on the object side or image side of other lenses and their vertical distance from the optical axis or the amount of their sinking are the same as those described above.

Variables related to aberrations The optical distortion of the optical imaging system (Optical Distortion) is expressed by ODT; the TV distortion (TV Distortion) is expressed by TDT, and it can be further limited to describe the degree of aberration shift between 50% and 100% of the field of view; spherical aberration The shift is expressed in DFS; the comet aberration offset is expressed in DFC.

The modulation transfer function (MTF) of the optical imaging system is used to test and evaluate the contrast and sharpness of the imaging system. The vertical axis of the modulation transfer function characteristic diagram represents the contrast transfer rate (value from 0 to 1), and the horizontal axis represents the spatial frequency (cycles/mm; lp/mm; line pairs per mm). The perfect imaging system can theoretically present 100% line contrast of the object being photographed. However, in the actual imaging system, the value of the contrast transfer rate on the vertical axis is less than 1. In addition, generally speaking, the edge area of the image will be more difficult to obtain a fine reduction degree than the center area. Infrared light spectrum On the infrared imaging surface, the optical axis, 0.3 field of view, and 0.7 field of view are at a spatial frequency of 55 cycles/mm. The contrast transfer rate (MTF value) is expressed as MTFE0, MTFE3, and MTFE7, respectively. The optical axis, 0.3 field of view The contrast transfer rate (MTF value) of the field and 0.7 field of view 3 at a spatial frequency of 110 cycles/mm are expressed in MTFQ0, MTFQ3 and MTFQ7, respectively. The comparison of the optical axis, 0.3 field of view and 0.7 field of view 3 at a spatial frequency of 220 cycles/mm The transfer rate (MTF value) is expressed in MTFH0, MTFH3 and MTFH7, respectively. The optical axis, 0.3 field of view and 0.7 field of view are at a spatial frequency of 440 cycles/mm. The comparative transfer rate (MTF value) is expressed in MTF0, MTF3 and MTF7, respectively. The aforementioned three fields of view are representative of the center of the lens, the inner field of view, and the outer field of view, so they can be used to evaluate whether the performance of a particular optical imaging system is excellent. If the design of the optical imaging system corresponds to a pixel size (Pixel Size) containing a photosensitive element below 1.12 microns, the modulation transfer function characteristic map has a quarter spatial frequency, half spatial frequency (half frequency), and full spatial frequency ( Full frequency) at least 110 cycles/mm, 220 cycles/mm and 440 cycles/mm.

For infrared spectrum imaging, such as night vision requirements for low light sources, the working wavelength used can be 850 nm to 960 nm. Because the main function is to recognize the contours of objects formed by black and white light and dark, high resolution is not required, so only The spatial frequency of less than 110 cycles/mm needs to be selected to evaluate whether the performance of the specific optical imaging system in the infrared spectrum is excellent.

This creation provides an optical imaging system in which the fifth lens has an inflexion point on the object side or image side, which can effectively adjust the angle of incidence of each field of view on the fifth lens and correct the optical distortion and TV distortion. In addition, the surface of the fifth lens can have better optical path adjustment capability to improve imaging quality.

According to the present invention, an optical imaging system is provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and an infrared light imaging surface in order from the object side to the image side. At least one of the first lens to the fifth lens has a positive refractive power, the focal lengths of the first lens to the fifth lens are f1, f2, f3, f4, f5, and the focal length of the optical imaging system is f, The entrance pupil diameter of the optical imaging system is HEP, the first lens object side to the infrared light imaging plane has a distance HOS on the optical axis, and the first lens object side to the fifth lens image side have a distance on the optical axis At a distance of InTL, half of the maximum viewing angle of the optical imaging system is HAF, and the thicknesses of the first lens to the fifth lens at a height of 1/2 HEP and parallel to the optical axis are ETP1, ETP2, ETP3, ETP4, and ETP5, respectively The sum of the aforementioned ETP1 to ETP5 is SETP, and the thicknesses of the first lens to the fifth lens on the optical axis are TP1, TP2, TP3, TP4, and TP5, respectively. The sum of the aforementioned TP1 to TP5 is STP, which satisfies the following conditions: 0.5≦f/HEP≦1.8; 0 deg>HAF≦50 deg and 0.5≦SETP/STP>1.

According to the present invention, an optical imaging system is further provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and an infrared imaging surface in order from the object side to the image side. And at least one surface of at least one of the first lens to the fifth lens has at least one inflection point. The focal lengths of the first lens to the fifth lens are f1, f2, f3, f4, and f5, respectively. The focal length of the imaging system is f, the diameter of the entrance pupil of the optical imaging system is HEP, the distance from the object side of the first lens to the imaging surface of the infrared light is a distance HOS on the optical axis, and the object side of the first lens to the fifth transmission The mirror image side has a distance InTL on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, the coordinate point at the height of 1/2 HEP on the object side of the first lens to the infrared imaging surface is parallel to the light The horizontal distance of the axis is ETL, and the horizontal distance between the coordinate point at the height of 1/2 HEP on the object side of the first lens and the coordinate point at the height of 1/2 HEP on the image side of the fifth lens is EIN , Which satisfies the following conditions: 0.5≦f/HEP≦1.5; 0 deg>HAF≦50 deg and 0.2≦EIN/ETL> 1

According to the present invention, an optical imaging system is further provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and an infrared imaging surface in order from the object side to the image side. There are five lenses with refractive power in the optical imaging system and at least one surface of at least one lens from the first lens to the fifth lens has at least one inflection point, and the focal lengths to the fifth lens are f1 and f2, respectively , F3, f4, f5, the focal length of the optical imaging system is f, the diameter of the entrance pupil of the optical imaging system is HEP, the distance from the object side of the first lens to the infrared light imaging surface on the optical axis is HOS, the first A lens object side to the fifth lens image side has a distance InTL on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, the optical imaging system has a perpendicular to the optical axis on the infrared imaging surface The maximum imaging height HOI, the horizontal distance between the coordinate point at the height of 1/2 HEP on the object side of the first lens and the infrared light imaging plane parallel to the optical axis is ETL, and the object side at the first lens is at 1/2 HEP The horizontal distance between the coordinate point of the height and the coordinate point at the height of 1/2 HEP on the image side of the fifth lens parallel to the optical axis is EIN, which satisfies the following conditions: 0.5≦f/HEP≦1.3; 10 deg≦HAF≦ 50 deg and 0.2≦EIN/ETL> 1.

The thickness of a single lens at the height of 1/2 entrance pupil diameter (HEP), which particularly affects the correction aberration of the common field of view of each ray within the range of 1/2 entrance pupil diameter (HEP) and the optical path difference between the rays of each field The greater the thickness, the greater the ability to correct aberrations, but at the same time it will increase the difficulty of manufacturing. Therefore, it is necessary to control the thickness of a single lens at a height of 1/2 entrance pupil diameter (HEP), especially to control the lens at The ratio between the thickness (ETP) of the height of 1/2 the entrance pupil diameter (HEP) and the thickness (TP) of the lens on the optical axis to which the surface belongs (ETP/TP). For example, the thickness of the first lens at a height of 1/2 the entrance pupil diameter (HEP) is represented by ETP1. The thickness of the second lens at a height of 1/2 the entrance pupil diameter (HEP) is represented by ETP2. The thickness of the remaining lenses in the optical imaging system at a height of 1/2 the entrance pupil diameter (HEP), which is expressed in the same way. The sum of the foregoing ETP1 to ETP5 is SETP, and the embodiment of the present invention can satisfy the following formula: 0.3≦SETP/EIN>1.

In order to balance the improvement of the ability to correct aberration and the difficulty of manufacturing, it is necessary to control the thickness of the lens (ETP) at the height of 1/2 entrance pupil diameter (HEP) and the thickness of the lens on the optical axis (TP ) Between the ratio (ETP / TP). For example, the thickness of the first lens at the height of 1/2 the entrance pupil diameter (HEP) is represented by ETP1, the thickness of the first lens on the optical axis is TP1, and the ratio between the two is ETP1/TP1. The thickness of the second lens at the height of 1/2 the entrance pupil diameter (HEP) is represented by ETP2, and the thickness of the second lens on the optical axis is TP2, and the ratio between the two is ETP2/TP2. The ratio between the thickness of the remaining lens in the optical imaging system at the height of 1/2 the entrance pupil diameter (HEP) and the thickness of the lens on the optical axis (TP), and so on. The embodiment of this creation can satisfy the following formula: 0> ETP/TP≦5.

The horizontal distance between two adjacent lenses at the height of 1/2 entrance pupil diameter (HEP) is represented by ED. The aforementioned horizontal distance (ED) is parallel to the optical axis of the optical imaging system and particularly affects the 1/2 entrance pupil diameter (HEP) ) The ability to correct aberrations in the common area of each field of view and the optical path difference between each field of view. The greater the horizontal distance, the more likely the ability to correct aberrations will increase, but it will also increase manufacturing difficulties. Degree and limit the degree of "minimization" of the length of the optical imaging system, it is necessary to control the horizontal distance (ED) of the two adjacent lenses at the height of 1/2 entrance pupil diameter (HEP).

In order to balance the improvement of the ability to correct aberrations and the difficulty of reducing the length of the optical imaging system, it is necessary to control the horizontal distance (ED) of the two adjacent lenses at the height of 1/2 entrance pupil diameter (HEP) and the The proportional relationship (ED/IN) between the horizontal distance (IN) of two adjacent lenses on the optical axis. For example, the horizontal distance between the first lens and the second lens at the height of 1/2 the entrance pupil diameter (HEP) is represented by ED12, the horizontal distance between the first lens and the second lens on the optical axis is IN12, and the ratio between the two is ED12 / IN12. The horizontal distance between the second lens and the third lens at the height of 1/2 the entrance pupil diameter (HEP) is represented by ED23, the horizontal distance between the second lens and the third lens on the optical axis is IN23, and the ratio between the two is ED23 / IN23. In the optical imaging system, the ratio between the horizontal distance between the remaining two adjacent lenses at the height of 1/2 the entrance pupil diameter (HEP) and the horizontal distance between the adjacent two lenses on the optical axis is expressed in the same way.

The horizontal distance between the coordinate point at the height of 1/2 HEP on the image side of the fifth lens and the infrared light imaging plane parallel to the optical axis is EBL, and the intersection of the image side of the fifth lens with the optical axis to the infrared light imaging The horizontal distance of the plane parallel to the optical axis is BL. The embodiment of the present invention is to simultaneously balance the ability to improve aberration correction and reserve space for other optical components. The following formula can be satisfied: 0.1≦EBL/BL≦1.5.

The optical imaging system may further include a filter element located between the fifth lens and the infrared imaging surface, the coordinate point of the fifth lens image side at a height of 1/2 HEP to the filter element The distance between the parallel to the optical axis is EIR, and the distance between the intersection of the fifth lens image side and the optical axis and the filter element parallel to the optical axis is PIR. The embodiment of the present invention can satisfy the following formula: 0.1≦EIR /PIR≦1.1.

When │f1│>f5, the total height of the optical imaging system (HOS; Height of Optic System) can be shortened properly to achieve the purpose of miniaturization.

When │f2│+│f3│+│f4│ and ∣f1│+∣f5│ meet the above conditions, at least one of the second lens to the fourth lens has a weak positive refractive power or a weak negative refractive power . The so-called weak refractive power means that the absolute value of the focal length of a particular lens is greater than 10. When at least one of the second lens to the fourth lens has a weak positive refractive power, it can effectively share the positive refractive power of the first lens and avoid unnecessary aberrations from appearing prematurely; otherwise, if the second lens to the fourth lens At least one of the four lenses has a weak negative refractive power, and the aberration of the correction system can be fine-tuned.

In addition, the fifth lens may have negative refractive power, and its image side may be concave. In this way, it is beneficial to shorten the back focal length to maintain miniaturization. In addition, at least one surface of the fifth lens may have at least one inflection point, which can effectively suppress the angle of incidence of the off-axis field of view and further correct the aberration of the off-axis field of view.

An optical imaging system group includes, in order from the object side to the image side, a refractive first lens, a second lens, a third lens, a fourth lens, a fifth lens, and an infrared imaging surface. The optical imaging system may further include an image sensing element, which is disposed on the infrared imaging surface.

The optical imaging system can be designed using three infrared operating wavelengths, namely 850 nm, 940 nm, and 960 nm, of which 940 nm is the main reference wavelength and the main reference wavelength for extracting technical features.

The ratio of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power PPR, the ratio of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power NPR, all lenses with positive refractive power The sum of PPR is ΣPPR, and the sum of NPR of all lenses with negative refractive power is ΣNPR. It helps to control the total refractive power and total length of the optical imaging system when the following conditions are met: 0.5≦ΣPPR/│ΣNPR│≦3.0, preferably Ground, the following conditions can be satisfied: 1≦ΣPPR/│ΣNPR│≦2.5.

The optical imaging system may further include an image sensing element, which is disposed on the infrared imaging surface. The half of the diagonal length of the effective sensing area of the image sensing element (that is, the imaging height or maximum image height of the optical imaging system) is HOI, and the distance from the object side of the first lens to the infrared imaging surface on the optical axis is HOS , Which satisfies the following conditions: HOS/HOI≦25; and 0.5≦HOS/f≦25. Preferably, the following conditions can be satisfied: 1≦HOS/HOI≦20; and 1≦HOS/f≦20. In this way, the miniaturization of the optical imaging system can be maintained for mounting on thin and light portable electronic products.

In addition, in the optical imaging system of the present invention, at least one aperture can be set according to requirements to reduce stray light and help improve image quality.

In the optical imaging system of this creation, the aperture configuration can be a front aperture or a center aperture, where the front aperture means the aperture is set between the subject and the first lens, and the center aperture means the aperture is set between the first lens and Between infrared imaging surfaces. If the aperture is the front aperture, the exit pupil of the optical imaging system and the infrared imaging surface can form a longer distance to accommodate more optical elements, and the efficiency of the image sensing element to receive images can be increased; if it is a central aperture It is helpful to expand the angle of view of the system, so that the optical imaging system has the advantage of a wide-angle lens. The distance from the aforementioned aperture to the infrared imaging surface is InS, which satisfies the following condition: 0.2≦InS/HOS≦1.1. With this, it is possible to simultaneously maintain the miniaturization of the optical imaging system and the characteristics of having a wide angle.

In the optical imaging system of this creation, the distance between the object side of the first lens and the image side of the fifth lens is InTL, and the total thickness of all lenses with refractive power on the optical axis is ΣTP, which satisfies the following conditions: 0.1≦ΣTP/ InTL≦0.9. In this way, the contrast of system imaging and the yield of lens manufacturing can be taken into account at the same time, and an appropriate back focal length can be provided to accommodate other components.

The radius of curvature of the object side of the first lens is R1, and the radius of curvature of the image side of the first lens is R2, which satisfies the following conditions: 0.01>│R1/R2│>100. In this way, the first lens has an appropriate positive refractive power strength to prevent the spherical aberration from increasing too fast. Preferably, the following conditions can be satisfied: 0.05>│R1/R2│>80.

The radius of curvature of the object side of the fifth lens is R9, and the radius of curvature of the image side of the fifth lens is R10, which satisfies the following condition: -50>(R9-R10)/(R9+R10)>50. In this way, it is beneficial to correct the astigmatism generated by the optical imaging system.

The separation distance between the first lens and the second lens on the optical axis is IN12, which satisfies the following condition: IN12 / f ≦5.0. This helps to improve the chromatic aberration of the lens to improve its performance.

The separation distance between the fourth lens and the fifth lens on the optical axis is IN45, which satisfies the following condition: IN45 / f ≦5.0. This helps to improve the chromatic aberration of the lens to improve its performance.

The thickness of the first lens and the second lens on the optical axis are TP1 and TP2, respectively, which satisfy the following conditions: 0.1≦(TP1+IN12) / TP2≦50.0. In this way, it helps to control the sensitivity of optical imaging system manufacturing and improve its performance.

The thicknesses of the fourth lens and the fifth lens on the optical axis are TP4 and TP5, respectively. The separation distance between the two lenses on the optical axis is IN45, which satisfies the following conditions: 0.1≦(TP5+IN45) / TP4≦50.0. In this way, it helps to control the sensitivity of optical imaging system manufacturing and reduce the overall height of the system.

The thickness of the second lens, the third lens, and the fourth lens on the optical axis are TP2, TP3, and TP4, respectively. The distance between the second lens and the third lens on the optical axis is IN23, and the distance between the third lens and the fourth lens is The separation distance on the optical axis is IN34, and the distance between the object side of the first lens and the image side of the fifth lens is InTL, which satisfies the following condition: 0.1≦TP3/ (IN23+TP3+IN34)>1. In this way, it helps layer by layer to slightly correct the aberration generated by the incident light traveling process and reduce the total height of the system.

In the optical imaging system of this invention, the vertical distance between the critical point C51 of the fifth lens object side and the optical axis is HVT51, the vertical distance between the critical point C52 of the fifth lens image side and the optical axis is HVT52, and the fifth lens object side is The horizontal displacement distance from the intersection point on the optical axis to the critical point C51 at the optical axis is SGC51, and the horizontal displacement distance from the intersection point on the optical axis of the fifth lens image side to the critical point C52 at the optical axis is SGC52, which satisfies the following conditions : 0 mm≦HVT51≦3 mm; 0 mm> HVT52≦6 mm; 0≦HVT51/HVT52; 0 mm≦∣SGC51∣≦0.5 mm; 0 mm>∣SGC52∣≦2 mm; and 0 >∣SGC52∣/ (∣SGC52∣+TP5)≦0.9. With this, the aberration of the off-axis field of view can be effectively corrected.

The optical imaging system of this creation meets the following conditions: 0.2≦HVT52/ HOI≦0.9. Preferably, the following condition can be satisfied: 0.3≦HVT52/ HOI≦0.8. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

The optical imaging system of this creation meets the following conditions: 0≦HVT52/ HOS≦0.5. Preferably, the following condition can be satisfied: 0.2≦HVT52/HOS≦0.45. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

In the optical imaging system of the present invention, the horizontal displacement distance between the intersection point of the fifth lens object side on the optical axis and the inflection point of the closest optical axis of the fifth lens object side parallel to the optical axis is represented by SGI511, and the fifth lens image The horizontal displacement distance between the intersection point of the side on the optical axis and the reflex point of the closest optical axis of the fifth lens image side parallel to the optical axis is represented by SGI521, which satisfies the following conditions: 0> SGI511 /( SGI511+TP5)≦0.9 ; 0> SGI521 /( SGI521+TP5)≦0.9. Preferably, the following conditions can be satisfied: 0.1≦SGI511 /( SGI511+TP5)≦0.6; 0.1≦SGI521 /( SGI521+TP5)≦0.6.

The horizontal displacement distance between the intersection point of the fifth lens object side on the optical axis and the reflex point of the second lens object side near the optical axis parallel to the optical axis is expressed by SGI512. The image side of the fifth lens on the optical axis The horizontal displacement distance between the intersection point and the reflex point near the optical axis of the fifth lens image side parallel to the optical axis is represented by SGI522, which satisfies the following conditions: 0> SGI512/( SGI512+TP5)≦0.9; 0> SGI522 /( SGI522+TP5)≦0.9. Preferably, the following conditions can be satisfied: 0.1≦SGI512 /( SGI512+TP5)≦0.6; 0.1≦SGI522 /( SGI522+TP5)≦0.6.

The vertical distance between the reflex point of the closest optical axis of the fifth lens object side and the optical axis is represented by HIF511, the intersection point of the fifth lens image side on the optical axis to the reflex point and optical axis of the closest optical axis of the fifth lens image side The vertical distance between them is expressed by HIF521, which meets the following conditions: 0.001 mm≦│HIF511∣≦5 mm; 0.001 mm≦│HIF521∣≦5 mm. Preferably, the following conditions can be satisfied: 0.1 mm≦│HIF511∣≦3.5 mm; 1.5 mm≦│HIF521∣≦3.5 mm.

The vertical distance between the second reflex point near the optical axis of the fifth lens object side and the optical axis is expressed by HIF512, and the intersection point of the fifth lens image side on the optical axis to the second lens side reflex of the fifth lens image side The vertical distance between the point and the optical axis is expressed by HIF522, which meets the following conditions: 0.001 mm≦│HIF512∣≦5 mm; 0.001 mm≦│HIF522∣≦5 mm. Preferably, the following conditions can be satisfied: 0.1 mm≦│HIF522∣≦3.5 mm; 0.1 mm≦│HIF512∣≦3.5 mm.

The vertical distance between the third reflex point near the optical axis of the fifth lens object side and the optical axis is represented by HIF513, and the intersection point of the fifth lens image side on the optical axis to the third near optical axis recurve of the fifth lens image side The vertical distance between the point and the optical axis is expressed by HIF523, which satisfies the following conditions: 0.001 mm≦│HIF513∣≦5 mm; 0.001 mm≦│HIF523∣≦5 mm. Preferably, the following conditions can be satisfied: 0.1 mm≦│HIF523∣≦3.5 mm; 0.1 mm≦│HIF513∣≦3.5 mm.

The vertical distance between the fourth inflection point of the fifth lens object side near the optical axis and the optical axis is represented by HIF514, and the intersection of the fifth lens image side on the optical axis to the fourth lens side image inversion of the fifth lens side The vertical distance between the point and the optical axis is represented by HIF524, which meets the following conditions: 0.001 mm≦│HIF514∣≦5 mm; 0.001 mm≦│HIF524∣≦5 mm. Preferably, the following conditions can be satisfied: 0.1 mm≦│HIF524∣≦3.5 mm; 0.1 mm≦│HIF514∣≦3.5 mm.

An embodiment of the optical imaging system of the present invention can help to correct the chromatic aberration of the optical imaging system by staggering the lenses with high and low dispersion coefficients.

The above equation of aspheric surface is: z=ch ² /[1+[1-(k+1)c ² h ² ] ^0.5 ]+A4h ⁴ +A6h ⁶ +A8h ⁸ +A10h ¹⁰ +A12h ¹² +A14h ¹⁴ + A16h ¹⁶ +A18h ¹⁸ +A20h ²⁰ +… (1) where z is the position value along the optical axis at the height h with the surface vertex as a reference, k is the cone coefficient, and c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are high-order aspheric coefficients.

In the optical imaging system provided by this creation, the lens can be made of plastic or glass. When the lens material is plastic, it can effectively reduce the production cost and weight. In addition, when the material of the lens is glass, the thermal effect can be controlled and the design space for the configuration of the refractive power of the optical imaging system can be increased. In addition, the object side and the image side of the first lens to the fifth lens in the optical imaging system can be aspherical, which can obtain more control variables. In addition to reducing aberrations, compared with the use of traditional glass lenses, even The number of lenses used can be reduced, so the total height of the original optical imaging system can be effectively reduced.

Furthermore, in the optical imaging system provided by this work, if the lens surface is convex, in principle, the lens surface is convex at the low optical axis; if the lens surface is concave, in principle, the lens surface is at the low optical axis. Concave.

The optical imaging system of this creation can be applied to the mobile focusing optical system according to the visual demand, and has the characteristics of excellent aberration correction and good imaging quality, thereby expanding the application level.

The more visible requirements of the optical imaging system of the present invention include a driving module, which can be coupled with the lenses and displace the lenses. The aforementioned driving module may be a voice coil motor (VCM) for driving the lens to focus, or an optical anti-shake element (OIS) for reducing the frequency of out-of-focus caused by lens vibration during the shooting process.

The optical imaging system of the present invention can make the first lens, the second lens, the third lens, the fourth lens, and the fifth lens at least one lens a light filtering element with a wavelength less than 500 nm according to the demand, which can be determined by the specific tool The coating on at least one surface of the lens with the filtering function or the lens itself is made of a material with a filterable short wavelength.

The infrared imaging surface of the optical imaging system of this creation can be selected as a flat surface or a curved surface according to the demand. When the infrared imaging surface is a curved surface (such as a spherical surface with a radius of curvature), it helps to reduce the angle of incidence required to focus light on the infrared imaging surface, in addition to helping to achieve the length of the miniature optical imaging system (TTL) , At the same time help to increase the relative illumination.

The optical imaging system of this creation can be applied to the acquisition of stereoscopic images. By projecting light with specific characteristics onto the object, after being reflected on the surface of the object, it is received by the lens and calculated and analyzed to obtain the distance between each position of the object and the lens. Then determine the information of the stereoscopic image. Most of the projected light uses infrared rays of a specific wavelength band to reduce interference, thereby achieving more accurate measurement. The aforementioned 3D sensing method for capturing a stereoscopic image may use time-of-flight (TOF) or structured light technologies, but is not limited thereto.

According to the above-mentioned embodiments, specific examples are presented below and explained in detail in conjunction with the drawings.

First embodiment

Please refer to FIGS. 1A and 1B, in which FIG. 1A shows a schematic diagram of an optical imaging system according to the first embodiment of the present creation, and FIG. 1B is from left to right in order for the optical imaging system of the first embodiment. Graph of spherical aberration, astigmatism and optical distortion. FIG. 1C is a characteristic diagram of infrared light spectrum modulation conversion in this embodiment. As can be seen from FIG. 1A, the optical imaging system includes a first lens 110, an aperture 100, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and an infrared filter in order from the object side to the image side 170. Infrared imaging surface 180 and image sensing element 190.

The first lens 110 has negative refractive power and is made of plastic material. Its object side 112 is convex, its image side 114 is concave, and both are aspherical, and its object side 112 has an inflexion point. The thickness of the first lens on the optical axis is TP1, and the thickness of the first lens at the height of 1/2 the entrance pupil diameter (HEP) is represented by ETP1.

The horizontal displacement distance between the intersection of the first lens object side on the optical axis and the reflex point of the closest optical axis of the first lens side parallel to the optical axis is represented by SGI111, and the reflex point of the closest optical axis of the first lens image side The horizontal displacement distance parallel to the optical axis is expressed by SGI121, which satisfies the following conditions: SGI111 = 1.96546 mm; ∣SGI111∣/(∣SGI111∣+TP1) = 0.72369.

The vertical distance between the reflex point of the closest optical axis of the object side of the first lens and the optical axis is represented by HIF111, and the vertical distance between the reflex point of the closest optical axis of the image side of the first lens and the optical axis is represented by HIF121, which satisfies the following conditions : HIF111 = 3.38542 mm; HIF111/ HOI = 0.90519.

The second lens 120 has positive refractive power and is made of plastic material. Its object side 122 is convex, and its image side 124 is concave, and both are aspherical. The thickness of the second lens on the optical axis is TP2, and the thickness of the second lens at the height of 1/2 the entrance pupil diameter (HEP) is represented by ETP2.

The horizontal displacement distance between the intersection of the second lens object side on the optical axis and the reflex point of the closest optical axis of the second lens object side parallel to the optical axis is represented by SGI211, and the reflex point of the closest optical axis of the second lens image side The horizontal displacement distance between the parallel to the optical axis is represented by SGI221.

The vertical distance between the reflex point of the closest optical axis of the object side of the second lens and the optical axis is represented by HIF211, and the vertical distance between the reflex point of the closest optical axis of the image side of the second lens and the optical axis is represented by HIF221.

The third lens 130 has a positive refractive power and is made of plastic material. Its object side 132 is convex, its image side 134 is convex, and both are aspherical, and its object side 132 has an inflection point. The thickness of the third lens on the optical axis is TP3, and the thickness of the third lens at the height of 1/2 the entrance pupil diameter (HEP) is represented by ETP3.

The horizontal displacement distance between the intersection point of the third lens object side on the optical axis and the reflex point of the closest optical axis of the third lens object side parallel to the optical axis is represented by SGI311, and the intersection point of the third lens image side on the optical axis to The horizontal displacement distance between the reflex points of the closest optical axis of the third lens image side and the optical axis is expressed as SGI321, which satisfies the following conditions: SGI311= 0.00388 mm; ∣SGI311∣ /(∣SGI311∣+TP3)= 0.00414

The horizontal displacement distance between the intersection point of the third lens object side on the optical axis and the second lens object side's inflection point near the optical axis parallel to the optical axis is represented by SGI312, and the third lens image side on the optical axis The horizontal displacement distance parallel to the optical axis between the intersection point and the second lens-side reflex point near the optical axis of the third lens image is represented by SGI322.

The vertical distance between the reflex point of the closest optical axis of the third lens object side and the optical axis is represented by HIF311, and the vertical distance between the reflex point of the closest optical axis of the third lens image side and the optical axis is represented by HIF321, which satisfies the following conditions : HIF311= 0.38898 mm; HIF311/ HOI= 0.10400.

The vertical distance between the second reflex point near the optical axis of the third lens object side and the optical axis is represented by HIF412, and the vertical distance between the second reflex point near the optical axis of the fourth lens image side and the optical axis is represented by HIF422.

The fourth lens 140 has a positive refractive power and is made of plastic material. Its object side 142 is convex, its image side 144 is convex, and both are aspherical, and its object side 142 has an inflection point. The thickness of the fourth lens on the optical axis is TP4, and the thickness of the fourth lens at the height of 1/2 the entrance pupil diameter (HEP) is represented by ETP4.

The horizontal displacement distance between the intersection point of the fourth lens object side on the optical axis and the reflex point of the closest optical axis of the fourth lens object side parallel to the optical axis is represented by SGI411, and the intersection point of the fourth lens image side on the optical axis to The horizontal displacement distance between the reflex points of the closest optical axis of the fourth lens image side and the optical axis is expressed as SGI421, which satisfies the following conditions: SGI421 = 0.06508 mm; ∣SGI421∣/(∣SGI421∣+TP4) = 0.03459.

The horizontal displacement distance between the intersection point of the fourth lens object side on the optical axis and the second lens object side deflector point close to the optical axis parallel to the optical axis is represented by SGI412, and the fourth lens image side on the optical axis The horizontal displacement distance parallel to the optical axis between the intersection point and the second lens-side reflex point near the optical axis of the fourth lens is represented by SGI422.

The vertical distance between the reflex point of the closest optical axis of the fourth lens object side and the optical axis is represented by HIF411, and the vertical distance between the reflex point of the closest optical axis of the fourth lens image side and the optical axis is represented by HIF421, which satisfies the following conditions : HIF421 = 0.85606 mm; HIF421/ HOI = 0.22889.

The vertical distance between the second reflex point near the optical axis of the fourth lens object side and the optical axis is represented by HIF412, and the vertical distance between the second reflex point near the optical axis of the fourth lens image side and the optical axis is represented by HIF422.

The fifth lens 150 has negative refractive power and is made of plastic material. Its object side 152 is concave, its image side 154 is concave, and both are aspherical, and its object side 152 and image side 154 both have an inflection point. The thickness of the fifth lens on the optical axis is TP5, and the thickness of the fifth lens at the height of 1/2 the entrance pupil diameter (HEP) is represented by ETP5.

The horizontal displacement distance between the intersection of the fifth lens object side on the optical axis and the reflex point of the closest optical axis of the fifth lens object side parallel to the optical axis is represented by SGI511, and the intersection point of the fifth lens image side on the optical axis to The horizontal displacement distance between the reflex point of the closest optical axis of the fifth lens image side and the optical axis is represented by SGI521, which satisfies the following conditions: SGI511= -1.51505 mm; ∣SGI511∣/(∣SGI511∣+TP5)= 0.70144 ; SGI521 = 0.01229 mm; ∣SGI521∣/(∣SGI521∣+TP5) = 0.01870.

The horizontal displacement distance between the intersection point of the fifth lens object side on the optical axis and the reflex point of the second lens object side near the optical axis parallel to the optical axis is expressed by SGI512. The image side of the fifth lens on the optical axis The horizontal displacement distance between the intersection point and the inflection point of the fifth lens image side near the optical axis, which is parallel to the optical axis, is represented by SGI522.

The vertical distance between the reflex point of the closest optical axis of the fifth lens object side and the optical axis is represented by HIF511, and the vertical distance between the reflex point of the closest optical axis of the fifth lens image side and the optical axis is represented by HIF521, which satisfies the following conditions : HIF511= 2.25435 mm; HIF511/ HOI= 0.60277; HIF521= 0.82313 mm; HIF521/ HOI= 0.22009.

The vertical distance between the second reflex point near the optical axis of the fifth lens object side and the optical axis is represented by HIF512, and the vertical distance between the second reflex point near the optical axis of the fifth lens image side and the optical axis is represented by HIF522.

In this embodiment, the distance from the coordinate point at the height of 1/2 HEP on the side of the first lens object to the infrared light imaging plane parallel to the optical axis is ETL, and the coordinate point at the height of 1/2 HEP on the side of the first lens object is The horizontal distance between the coordinate points at the height of 1/2 HEP on the image side of the fourth lens parallel to the optical axis is EIN, which satisfies the following conditions: ETL=10.449 mm; EIN= 9.752 mm; EIN/ETL=0.933.

This embodiment satisfies the following conditions, ETP1=0.870 mm; ETP2=0.780 mm; ETP3=0.825 mm; ETP4=1.562 mm; ETP5=0.923 mm. The sum of the aforementioned ETP1 to ETP5 SETP = 4.960 mm. TP1=0.750 mm; TP2=0.895 mm; TP3=0.932 mm; TP4=1.816 mm; TP5=0.645 mm; the sum of the aforementioned TP1 to TP5 STP=5.039 mm. SETP/STP = 0.984.

This embodiment specifically controls the proportional relationship (ETP/TP) between the thickness (ETP) of each lens at 1/2 the entrance pupil diameter (HEP) height and the thickness (TP) of the lens on the optical axis to which the surface belongs In order to achieve a balance between manufacturability and ability to correct aberrations, it satisfies the following conditions, ETP1/TP1=1.160; ETP2/TP2=0.871; ETP3/TP3=0.885; ETP4/TP4=0.860; ETP5/TP5=1.431.

This embodiment is to control the horizontal distance of each adjacent two lenses at the height of 1/2 entrance pupil diameter (HEP), in order to balance the length of the optical imaging system HOS "miniature" degree, manufacturability, and the ability to correct aberrations , In particular, the ratio between the horizontal distance (ED) of the two adjacent lenses at the height of 1/2 the entrance pupil diameter (HEP) and the horizontal distance (IN) of the two adjacent lenses on the optical axis (ED/IN) ), which satisfies the following conditions, the horizontal distance between the first lens and the second lens parallel to the optical axis at the height of 1/2 the entrance pupil diameter (HEP) is ED12=3.152 mm; the distance between the second lens and the third lens is 1 The horizontal distance of /2 entrance pupil diameter (HEP) height parallel to the optical axis is ED23 = 0.478 mm; the horizontal distance between the third lens and the fourth lens at 1/2 entrance pupil diameter (HEP) height parallel to the optical axis ED34=0.843 mm; the horizontal distance between the fourth lens and the fifth lens at the height of 1/2 the entrance pupil diameter (HEP) parallel to the optical axis is ED45=0.320 mm. The sum of the aforementioned ED12 to ED45 is expressed in SED and SED=4.792 mm.

The horizontal distance between the first lens and the second lens on the optical axis is IN12=3.190 mm, ED12 / IN12=0.988. The horizontal distance between the second lens and the third lens on the optical axis is IN23=0.561 mm, ED23 / IN23=0.851. The horizontal distance between the third lens and the fourth lens on the optical axis is IN34=0.656 mm, ED34 / IN34=1.284. The horizontal distance between the fourth lens and the fifth lens on the optical axis is IN45=0.405 mm, ED45 / IN45=0.792. The sum of the aforementioned IN12 to IN45 is represented by SIN and SIN = 0.999 mm. SED/SIN=1.083.

This implementation also meets the following conditions: ED12 / ED23=6.599; ED23 / ED34=0.567; ED34 / ED45=2.630; IN12 / IN23=5.687; IN23 / IN34=0.855; IN34 / IN45=1.622.

The horizontal distance between the coordinate point at the height of 1/2 HEP on the image side of the fifth lens and the infrared light imaging plane parallel to the optical axis is EBL = 0.697 mm, and the point of intersection between the image side of the fifth lens and the optical axis to the infrared light The horizontal distance between the imaging planes parallel to the optical axis is BL = 0.71184 mm. The embodiment of the present invention can satisfy the following formula: EBL/BL=0.979152. In this embodiment, the distance from the coordinate point at the height of 1/2 HEP on the image side of the fifth lens to the infrared filter parallel to the optical axis is EIR = 0.085 mm, and the intersection between the image side of the fifth lens and the optical axis to the infrared The distance between the filters parallel to the optical axis is PIR=0.100 mm and meets the following formula: EIR/PIR= 0.847.

The infrared filter 170 is made of glass, which is disposed between the fifth lens 150 and the infrared imaging surface 180 and does not affect the focal length of the optical imaging system.

In the optical imaging system of this embodiment, the focal length of the optical imaging system is f, the diameter of the entrance pupil of the optical imaging system is HEP, and the half of the maximum angle of view in the optical imaging system is HAF. The values are as follows: f = 3.03968 mm; f/HEP =1.6; and HAF=50.001 degrees and tan(HAF)=1.1918.

In the optical imaging system of this embodiment, the focal length of the first lens 110 is f1, and the focal length of the fifth lens 150 is f5, which satisfies the following conditions: f1= -9.24529 mm; ∣f/f1│= 0.32878; f5= -2.32439 ; And │f1│>f5.

In the optical imaging system of this embodiment, the focal lengths of the second lens 120 to the fifth lens 150 are f2, f3, f4, and f5, respectively, which satisfy the following conditions: │f2│+│f3│+│f4│= 17.3009 mm; ∣f1│+∣f5│= 11.5697 mm and │f2│+│f3│+│f4│>∣f1│+∣f5│.

The ratio PPR of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power, the ratio NPR of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power, optical imaging in this embodiment In the system, the total PPR of all positive refractive power lenses is ΣPPR=f/f2+f/f3+f/f4 = 1.86768, and the total NPR of all negative refractive power lenses is ΣNPR= f/f1+f/f5=- 1.63651, ΣPPR/│ΣNPR│ = 1.14125. It also meets the following conditions: ∣f/f2│=0.47958; ∣f/f3│=0.38289; ∣f/f4│=1.00521; ∣f/f5│= 1.30773.

In the optical imaging system of this embodiment, the distance between the first lens object side 112 to the fifth lens image side 154 is InTL, the distance between the first lens object side 112 to the infrared light imaging surface 180 is HOS, and the aperture 100 to infrared The distance between the optical imaging surface 180 is InS, the half of the diagonal length of the effective sensing area of the image sensing element 190 is HOI, and the distance between the image side surface 154 of the fifth lens and the infrared imaging surface 180 is BFL, which satisfies the following conditions : InTL+BFL=HOS; HOS= 10.56320 mm; HOI= 3.7400 mm; HOS/HOI= 2.8244; HOS/f= 3.4751; InS= 6.21073 mm; and InS/HOS= 0.5880.

In the optical imaging system of this embodiment, the total thickness of all lenses with refractive power on the optical axis is ΣTP, which satisfies the following conditions: ΣTP = 5.0393 mm; InTL = 9.8514 mm and ΣTP/InTL = 0.5115. In this way, the contrast of system imaging and the yield of lens manufacturing can be taken into account at the same time, and an appropriate back focal length can be provided to accommodate other components.

In the optical imaging system of this embodiment, the radius of curvature of the object side 112 of the first lens is R1, and the radius of curvature of the image side 114 of the first lens is R2, which satisfies the following conditions: │R1/R2│= 1.9672. In this way, the first lens has an appropriate positive refractive power strength to prevent the spherical aberration from increasing too fast.

In the optical imaging system of this embodiment, the curvature radius of the fifth lens object side 152 is R9, and the curvature radius of the fifth lens image side 154 is R10, which satisfies the following conditions: (R9-R10)/(R9+R10)= -1.1505. In this way, it is beneficial to correct the astigmatism generated by the optical imaging system.

In the optical imaging system of this embodiment, the sum of focal lengths of all lenses with positive refractive power is ΣPP, which meets the following conditions: ΣPP = f2+f3+f4 = 17.30090 mm; and f2/ (f2+f3+f4) = 0.36635 . In this way, it is helpful to appropriately distribute the positive refractive power of the second lens 120 to other positive lenses, so as to suppress the generation of significant aberrations in the process of the incident light.

In the optical imaging system of this embodiment, the sum of focal lengths of all lenses with negative refractive power is ΣNP, which satisfies the following conditions: ΣNP= f1+f5= -11.56968 mm; and f5/ (f1+f5)= 0.20090. In this way, it is helpful to appropriately distribute the negative refractive power of the fifth lens to other negative lenses, so as to suppress the generation of significant aberrations in the process of the incident light.

In the optical imaging system of this embodiment, the separation distance between the first lens 110 and the second lens 120 on the optical axis is IN12, which satisfies the following conditions: IN12 = 3.19016 mm; IN12 / f = 1.04951. This helps to improve the chromatic aberration of the lens to improve its performance.

In the optical imaging system of this embodiment, the separation distance between the fourth lens 140 and the fifth lens 150 on the optical axis is IN45, which satisfies the following conditions: IN45 = 0.40470 mm; IN45 / f = 0.13314. This helps to improve the chromatic aberration of the lens to improve its performance.

In the optical imaging system of this embodiment, the thickness of the first lens 110, the second lens 120, and the third lens 130 on the optical axis are TP1, TP2, and TP3, respectively, which satisfy the following conditions: TP1 = 0.75043 mm; TP2 = 0.89543 mm; TP3 = 0.93225 mm; and (TP1+IN12) / TP2 = 4.40078. In this way, it helps to control the sensitivity of optical imaging system manufacturing and improve its performance.

In the optical imaging system of this embodiment, the thicknesses of the fourth lens 140 and the fifth lens 150 on the optical axis are TP4 and TP5, respectively. The separation distance between the two lenses on the optical axis is IN45, which satisfies the following conditions: TP4= 1.81634 mm; TP5 = 0.64488 mm; and (TP5+IN45) / TP4 = 0.57785. In this way, it helps to control the sensitivity of optical imaging system manufacturing and reduce the overall height of the system.

In the optical imaging system of this embodiment, the distance between the third lens 130 and the fourth lens 140 on the optical axis is IN34, and the distance between the first lens object side 112 and the fifth lens image side 164 is InTL, which satisfies the following Conditions: TP2/TP3 = 0.96051; TP3/TP4 = 0.51325; TP4/TP5 = 2.81657; and TP3 / (IN23+TP3+IN34) = 0.43372. This helps to slightly correct the aberrations caused by the incident light traveling and reduce the total height of the system.

In the optical imaging system of this embodiment, the horizontal displacement distance from the intersection point of the fourth lens object side 142 on the optical axis to the maximum effective radius position of the fourth lens object side 142 on the optical axis is InRS41, and the fourth lens image side 144 is The horizontal displacement distance from the intersection point on the optical axis to the maximum effective radius position of the fifth lens image side 144 on the optical axis is InRS42, and the thickness of the fourth lens 140 on the optical axis is TP4, which satisfies the following conditions: InRS41= -0.09737 mm ; InRS42 = -1.31040 mm; │InRS41∣/ TP4 = 0.05361 and │InRS42∣/ TP4 = 0.72145. In this way, it is conducive to the production and molding of the lens and effectively maintains its miniaturization.

In the optical imaging system of this embodiment, the vertical distance between the critical point of the fourth lens object side 142 and the optical axis is HVT41, and the vertical distance between the critical point of the fourth lens image side 144 and the optical axis is HVT42, which satisfies the following conditions: HVT41=1.41740 mm; HVT42=0

In the optical imaging system of this embodiment, the horizontal displacement distance from the intersection of the fifth lens object side 152 on the optical axis to the maximum effective radius position of the fifth lens object side 152 on the optical axis is InRS51, and the fifth lens image side 154 is The horizontal displacement distance from the intersection point on the optical axis to the maximum effective radius position of the fifth lens image side 154 on the optical axis is InRS52, and the thickness of the fifth lens 150 on the optical axis is TP5, which satisfies the following conditions: InRS51= -1.63543 mm ; InRS52= -0.34495 mm; │InRS51∣/ TP5 = 2.53604 and │InRS52∣/ TP5 = 0.53491. In this way, it is conducive to the production and molding of the lens and effectively maintains its miniaturization.

In the optical imaging system of this embodiment, the vertical distance between the critical point of the fifth lens object side 162 and the optical axis is HVT51, and the vertical distance between the critical point of the fifth lens image side 154 and the optical axis is HVT52, which satisfies the following conditions: HVT51 = 0; HVT52 = 1.35891 mm; and HVT51/HVT52 = 0.

In the optical imaging system of this embodiment, it satisfies the following condition: HVT52/ HOI = 0.36334. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

In the optical imaging system of this embodiment, it satisfies the following conditions: HVT52/HOS = 0.12865. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

In the optical imaging system of this embodiment, the third lens and the fifth lens have negative refractive power, the third lens has a dispersion coefficient of NA3, and the fifth lens has a dispersion coefficient of NA5, which satisfies the following condition: NA5/NA3=0.368966. This helps to correct the chromatic aberration of the optical imaging system.

In the optical imaging system of this embodiment, the TV distortion of the optical imaging system during image formation becomes TDT, and the optical distortion during image formation becomes ODT, which satisfies the following conditions: │TDT│= 0.63350 %; │ODT│= 2.06135 %.

In the optical imaging system of this embodiment, when the infrared operating wavelength of 850 nm is focused on the infrared imaging surface, the optical axis, 0.3HOI and 0.7HOI of the image on the infrared imaging surface are at the spatial frequency (55 cycles/mm) The modulation conversion contrast transfer rate (MTF value) is expressed as MTFI0, MTFI3, and MTFI7, respectively, which satisfy the following conditions: MTFI0 is about 0.05; MTFI3 is about 0.12; and MTFI7 is about 0.11.

Refer to Table 1 and Table 2 below. Table 1 lens data of the first embodiment f (focal length) = 3.03968 mm; f/HEP = 1.6; HAF (half angle of view) = 50.0010 deg surface Radius of curvature Thickness (mm) Material Refractive index Dispersion coefficient focal length 0 Subject flat Infinity 1 First lens 4.01438621 0.750 plastic 1.514 56.80 -9.24529 2 2.040696375 3.602 3 aperture flat -0.412 4 Second lens 2.45222384 0.895 plastic 1.565 58.00 6.33819 5 6.705898264 0.561 6 Third lens 16.39663088 0.932 plastic 1.565 58.00 7.93877 7 -6.073735083 0.656 8 Fourth lens 4.421363446 1.816 plastic 1.565 58.00 3.02394 9 -2.382933539 0.405 10 Fifth lens -1.646639396 0.645 plastic 1.650 21.40 -2.32439 11 23.53222697 0.100 12 Infrared filter 1E+18 0.200 BK7_SCH 1.517 64.20 13 1E+18 0.412 14 Infrared imaging surface 1E+18 Reference wavelength is 555 nm Table 2. Aspheric coefficients of the first embodiment Table 2 Aspheric coefficients surface 1 2 4 5 6 7 8 k -1.882119E-01 -1.927558E+00 -6.483417E+00 1.766123E+01 -5.000000E+01 -3.544648E+01 -3.167522E+01 A4 7.686381E-04 3.070422E-02 5.439775E-02 7.241691E-03 -2.985209E-02 -6.315366E-02 -1.903506E-03 A6 4.630306E-04 -3.565153E-03 -7.980567E-03 -8.359563E-03 -7.175713E-03 6.038040E-03 -1.806837E-03 A8 3.178966E-05 2.062259E-03 -3.537039E-04 1.303430E-02 4.284107E-03 4.674156E-03 -1.670351E-03 A10 -1.773597E-05 -1.571117E-04 2.844845E-03 -6.951350E-03 -5.492349E-03 -8.031117E-03 4.791024E-04 A12 1.620619E-06 -4.694004E-05 -1.025049E-03 1.366262E-03 1.232072E-03 3.319791E-03 -5.594125E-05 A14 -4.916041E-08 7.399980E-06 1.913679E-04 3.588298E-04 -4.107269E-04 -5.356799E-04 3.704401E-07 A16 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A18 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00 Table 2 Aspheric coefficients surface 8 9 10 k -2.470764E+00 -1.570351E+00 4.928899E+01 A4 -2.346908E-04 -4.250059E-04 -4.625703E-03 A6 2.481207E-03 -1.591781E-04 -7.108872E-04 A8 -5.862277E-04 -3.752177E-05 3.429244E-05 A10 -1.955029E-04 -9.210114E-05 2.887298E-06 A12 1.880941E-05 -1.101797E-05 3.684628E-07 A14 1.132586E-06 3.536320E-06 -4.741322E-08 A16 0.000000E+00 0.000000E+00 0.000000E+00 A18 0.000000E+00 0.000000E+00 0.000000E+00 A20 0.000000E+00 0.000000E+00 0.000000E+00

Table 1 is the detailed structural data of the first embodiment of FIG. 1, in which the units of radius of curvature, thickness, distance and focal length are mm, and surfaces 0-16 sequentially represent the surface from the object side to the image side. Table 2 is the aspherical data in the first embodiment, where k is the conical coefficient in the aspherical curve equation, and A1-A20 represents the aspherical coefficients of the 1st to 20th orders of each surface. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration curve diagrams of the embodiments. The definitions of the data in the tables are the same as the definitions of Table 1 and Table 2 of the first embodiment, and are not repeated here.

Second embodiment Please refer to FIG. 2A and FIG. 2B, wherein FIG. 2A shows a schematic diagram of an optical imaging system according to the second embodiment of the present creation, and FIG. 2B is from left to right in order for the optical imaging system of the second embodiment. Graph of spherical aberration, astigmatism and optical distortion. FIG. 2C is a characteristic diagram of infrared light spectrum modulation conversion in this embodiment. As can be seen from FIG. 2A, the optical imaging system includes an aperture 200, a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, and an infrared filter in order from the object side to the image side 270, an infrared imaging surface 280, and an image sensing element 290.

The first lens 210 has positive refractive power and is made of plastic material. Its object side 212 is convex, its image side 214 is concave, and both are aspherical, and both its object side 212 and image side 214 have an inflection point.

The second lens 220 has a positive refractive power and is made of plastic material. Its object side 222 is concave, its image side 224 is convex, and both are aspherical, and its object side 222 and image side 224 have two inflexions.

The third lens 230 has a positive refractive power and is made of plastic material. Its object side 232 is convex, its image side 234 is concave, and both are aspherical, and its object side 232 has an inflexion point and the image side 234 has two Recurve point.

The fourth lens 240 has a positive refractive power and is made of plastic material. Its object side 242 is concave, its image side 244 is convex, and both are aspherical, and its object side 242 has two inflexions and the image side 244 has three Recurve point.

The fifth lens 250 has a negative refractive power and is made of plastic. Its object side 252 is convex, its image side 254 is concave, and both are aspherical, and its object side 252 and image side 254 both have a double inflection point. In this way, it is beneficial to shorten the back focal length to maintain miniaturization. In addition, it can effectively suppress the angle of incidence of the off-axis field of view, and can further correct the aberration of the off-axis field of view.

The infrared filter 270 is made of glass, which is disposed between the fifth lens 250 and the infrared imaging surface 280 and does not affect the focal length of the optical imaging system.

Please refer to Table 3 and Table 4 below. Table 3 Lens data of the second embodiment f (focal length) = 2.9745 mm; f/HEP = 0.9; HAF (half viewing angle) = 35.0 deg surface Radius of curvature Thickness (mm) Material Refractive index Dispersion coefficient focal length 0 Subject 1E+18 1E+18 1 aperture 1E+18 0.536 2 First lens 2.783916016 0.778 plastic 1.661 20.390 5.72931 3 9.699706974 0.318 4 Second lens -2.87366872 0.574 plastic 1.661 20.390 19.7653 5 -2.535299643 0.025 6 Third lens 1.086748693 0.293 plastic 1.661 20.390 16.204 7 1.082454613 0.630 8 Fourth lens -5.067356718 0.666 plastic 1.661 20.390 2.95718 9 -1.469970162 0.177 10 Fifth lens 5.236111736 0.415 plastic 1.661 20.390 -3.31323 11 1.482316918 0.413 12 Infrared filter 1E+18 0.125 NBK7 13 1E+18 0.380 14 Infrared imaging surface 1E+18 0.000 Reference wavelength is 940 nm; light blocking position: the clear radius of the first side is 1.800 mm; the clear radius of the sixth side is 1.450 mm; the clear radius of the 11th side is 1.800 mm Table 4. Aspheric coefficients of the second embodiment Table 4 Aspheric coefficients surface 2 3 4 5 6 7 8 k 1.593690E+00 2.697454E+01 3.465905E-17 5.030659E-01 -6.417137E-01 -5.323393E-01 -9.000000E+01 A4 -3.003049E-02 -3.380210E-02 1.362964E-01 7.986673E-02 -1.061838E-01 -9.510344E-02 2.253081E-02 A6 -1.627245E-02 -2.705232E-02 -1.692707E-01 -9.326553E-02 -4.525690E-03 7.348059E-02 1.289369E-01 A8 -5.849225E-03 -3.314322E-02 9.337756E-02 9.493576E-02 -4.278588E-02 -2.741517E-01 -2.149225E-01 A10 1.064875E-02 4.662520E-02 -5.129589E-03 -4.450284E-02 1.220400E-02 2.831786E-01 2.310671E-01 A12 -1.200214E-02 -2.179400E-02 -1.193757E-02 9.832331E-03 1.071322E-02 -1.547919E-01 -1.424939E-01 A14 5.117206E-03 4.658936E-03 4.049349E-03 -9.334366E-04 -6.108465E-03 4.422648E-02 4.582858E-02 A16 -7.583331E-04 -3.949062E-04 -4.344462E-04 2.022178E-05 8.949384E-04 -5.301173E-03 -6.196864E-03 Table 4 Aspheric coefficients surface 9 10 11 k -1.679640E-01 6.926229E+00 -4.211404E-01 A4 3.479956E-01 9.958660E-02 -1.836656E-01 A6 -4.464230E-01 -3.976687E-01 1.211541E-02 A8 5.774122E-01 4.169792E-01 2.756993E-02 A10 -4.943258E-01 -2.592580E-01 -2.187309E-02 A12 2.769709E-01 9.490728E-02 7.182626E-03 A14 -8.610039E-02 -1.819251E-02 -1.119505E-03 A16 1.098568E-02 1.398015E-03 6.159703E-05

In the second embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

According to Table 3 and Table 4, the following conditional formula values can be obtained: Second embodiment (using the main reference wavelength of 940 nm) MTFE0 MTFE3 MTFE7 MTFQ0 MTFQ3 MTFQ7 0.9 0.86 0.78 0.79 0.66 0.58 ETP1 ETP2 ETP3 ETP4 ETP5 BL 0.466 0.507 0.338 0.373 0.725 0.8422 ETP1/TP1 ETP2/TP2 ETP3/TP3 ETP4/TP4 ETP5/TP5 EBL/BL 0.600 0.884 1.155 0.560 1.747 0.8122 ETL EBL EIN EIR PIR EIN/ETL 4.649 0.684 3.966 0.179 0.413 0.853 SETP/EIN EIR/PIR SETP STP SETP /STP SED /SIN 0.607 0.433 2.409 2.724 0.884 1.354 ED12 ED23 ED34 ED45 SED SIN 0.278 0.812 0.207 0.259 1.557 1.149 ED12/IN12 ED23/IN23 ED34/IN34 ED45/IN45 HVT31 HVT32 0.874 32.479 0.329 1.468 0 0 ∣f/f1│ ∣f/f2│ ∣f/f3│ ∣f/f4│ ∣f/f5│ ∣f1/f2│ 0.51918 0.15049 0.18357 1.00586 0.89777 0.28987 ΣPPR ΣNPR ΣPPR /│ΣNPR∣ IN12 / f IN45 / f ∣f2/f3│ 1.1564 1.6005 0.7225 0.1069 0.0594 1.2198 TP3 / (IN23+TP3+IN34) (TP1+IN12)/ TP2 (TP5+IN45)/ TP4 0.30882 1.90973 0.88866 HOS InTL HOS / HOI InS/ HOS ODT% TDT% 4.71594 3.87371 2.35797 1.11355 3.11877 0.530551 HVT11 HVT12 HVT21 HVT22 HVT31 HVT32 1.22939 0.689511 0 0 0 0 HVT41 HVT42 HVT51 HVT52 HVT52/ HOI HVT52/ HOS 0.69890 1.15831 0.84858 1.32378 0.42429 0.17994 TP2 / TP3 TP3 / TP4 InRS51 InRS52 │InRS51│/TP5 │InRS52│/TP5 1.96037 0.43967 -0.104915 0.154754 0.25293 0.37308

According to Table 3 and Table 4, the following values can be obtained: The second embodiment is the value related to the inflexion point (using the main reference wavelength of 940 nm) HIF111 0.8308 HIF111/HOI 0.4154 SGI111 0.1118 │SGI111∣/(│SGI111∣+TP1) 0.1257 HIF121 0.4332 HIF121/HOI 0.2166 SGI121 0.0084 ∣SGI121│/(∣SGI121│+TP1) 0.0107 HIF211 1.0186 HIF211/HOI 0.5093 SGI211 -0.1371 │SGI211∣/(│SGI211∣+TP2) 0.1929 HIF212 1.4516 HIF212/HOI 0.7258 SGI212 -0.2112 │SGI212∣/(│SGI212∣+TP2) 0.2691 HIF221 0.9848 HIF221/HOI 0.4924 SGI221 -0.1603 ∣SGI221│/(∣SGI221│+TP2) 0.2184 HIF222 1.2602 HIF222/HOI 0.6301 SGI222 -0.2324 ∣SGI222│/(∣SGI222│+TP2) 0.2883 HIF311 0.8133 HIF311/HOI 0.4066 SGI311 0.2675 │SGI311∣/(│SGI311∣+TP3) 0.4776 HIF312 1.3551 HIF312/HOI 0.6776 SGI312 0.4932 │SGI312∣/(│SGI312∣+TP3) 0.6276 HIF321 0.8535 HIF321/HOI 0.4267 SGI321 0.3054 ∣SGI321│/(∣SGI321│+TP3) 0.5107 HIF322 1.4089 HIF322/HOI 0.7044 SGI322 0.5538 ∣SGI322│/(∣SGI322│+TP3) 0.6543 HIF411 0.3969 HIF411/HOI 0.1985 SGI411 -0.0129 │SGI411∣/(│SGI411∣+TP4) 0.0190 HIF412 1.2719 HIF412/HOI 0.6360 SGI412 0.0877 │SGI412∣/(│SGI412∣+TP4) 0.1164 HIF421 0.7211 HIF421/HOI 0.3605 SGI421 -0.1273 ∣SGI421│/(∣SGI421│+TP4) 0.1606 HIF422 1.4109 HIF422/HOI 0.7055 SGI422 -0.1623 ∣SGI422│/(∣SGI422│+TP4) 0.1960 HIF423 1.4680 HIF423/HOI 0.7340 SGI423 -0.1445 ∣SGI423│/(∣SGI423│+TP4) 0.1783 HIF511 0.5322 HIF511/HOI 0.2661 SGI511 0.0288 │SGI511∣/(│SGI511∣+TP5) 0.0650 HIF512 1.3461 HIF512/HOI 0.6730 SGI512 -0.0483 │SGI512∣/(│SGI512∣+TP5) 0.1044 HIF521 0.6528 HIF521/HOI 0.3264 SGI521 0.1162 ∣SGI521│/(∣SGI521│+TP5) 0.2189 HIF522 1.7251 HIF522/HOI 0.8626 SGI522 0.1742 ∣SGI522│/(∣SGI522│+TP5) 0.2958

Third embodiment Please refer to FIG. 3A and FIG. 3B, wherein FIG. 3A shows a schematic diagram of an optical imaging system according to the third embodiment of the present creation, and FIG. 3B is from left to right in order for the optical imaging system of the third embodiment. Graph of spherical aberration, astigmatism and optical distortion. FIG. 3C is a characteristic diagram of infrared light spectrum modulation conversion in this embodiment. As can be seen from FIG. 3A, the optical imaging system includes a first lens 310, an aperture 300, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, and an infrared filter in order from the object side to the image side 370. Infrared imaging surface 380 and image sensing element 390.

The first lens 310 has a negative refractive power and is made of plastic material. Its object side 312 is convex, its image side 314 is convex, and both are aspherical, and its image side 314 has an inflection point.

The second lens 320 has a positive refractive power and is made of plastic material. Its object side 322 is convex, its image side 324 is concave, and both are aspherical, and its object side 322 has an inflection point and the image side 324 has two Recurve point.

The third lens 330 has negative refractive power and is made of plastic material. Its object side 332 is convex, its image side 334 is concave, and both are aspherical, and both its object side 332 and image side 334 have a double inflection point.

The fourth lens 340 has negative refractive power and is made of plastic material. Its object side 342 is convex, its image side 344 is convex, and both are aspherical, and its object side 342 and image side 344 both have a double inflection point.

The fifth lens 350 has positive refractive power and is made of plastic material. Its object side 352 is concave, its image side 354 is convex, and both are aspherical, and its object side 352 and image side 354 both have an inflection point. In this way, it is beneficial to shorten the back focal length to maintain miniaturization.

The infrared filter 370 is made of glass, which is disposed between the fifth lens 350 and the infrared imaging surface 380 and does not affect the focal length of the optical imaging system.

Please refer to Table 5 and Table 6 below. Table 5 Third embodiment lens data f (focal length) = 4.4855 mm; f/HEP = 0.9; HAF (half viewing angle) = 35.4165 deg surface Radius of curvature Thickness (mm) Material Refractive index Dispersion coefficient focal length 0 Subject 1E+18 1E+18 1 First lens 4.728166107 0.728 plastic 1.661 20.390 -22.513 2 3.359600032 0.672 3 aperture 1E+18 0.025 4 Second lens 3.545728266 1.582 plastic 1.661 20.390 6.20095 5 23.61125425 1.024 6 Third lens -1.939604308 0.429 plastic 1.584 29.890 -41.6516 7 -2.280488919 0.060 8 Fourth lens 7.163876962 1.594 plastic 1.661 20.390 -22.2468 9 4.37529607 0.385 10 Fifth lens 1.501472698 1.198 plastic 1.661 20.390 3.95426 11 2.459451582 0.780 12 Infrared filter 1E+18 0.215 BK_7 1.517 23.89 13 1E+18 0.749 14 Infrared imaging surface 1E+18 0.000 The reference wavelength is 940 nm; light blocking position: the first side has a clear radius of 2.600 mm; the first side has a clear radius of 2.420 mm; the seventh face has a clear radius of 2.600 mm; the eighth face has a clear radius of 2.700 mm; The 11th side has a clear radius of 3.200 mm Table 6. Aspheric coefficients of the third embodiment Table 6 Aspheric coefficients surface 1 2 4 5 6 7 8 k 8.728288E-01 6.543236E-01 9.390313E-01 8.445844E+01 -9.921677E-01 -4.031430E-01 -6.203837E+01 A4 -1.355366E-02 -4.189049E-02 -2.312252E-02 -1.553982E-02 2.099630E-02 4.573828E-02 1.558567E-02 A6 -7.364970E-04 1.039168E-02 -4.656588E-03 -6.601903E-03 -2.647195E-02 -3.428234E-02 -1.005099E-02 A8 2.438920E-03 -2.687114E-03 3.197904E-03 2.700347E-03 1.753815E-02 1.944390E-02 4.000787E-03 A10 -9.277409E-04 6.579992E-04 -1.567512E-03 -6.809685E-04 -5.309843E-03 -5.439089E-03 -1.015102E-03 A12 1.694673E-04 -1.423150E-04 4.087334E-04 1.194612E-04 8.525850E-04 8.089113E-04 1.443513E-04 A14 -1.531728E-05 1.968519E-05 -5.802422E-05 -1.259711E-05 -7.153456E-05 -6.205946E-05 -1.021286E-05 A16 5.518327E-07 -1.226595E-06 3.342162E-06 5.702277E-07 2.482085E-06 1.952253E-06 2.814575E-07 Table 6 Aspheric coefficients surface 9 10 11 k -8.999985E+01 -5.679687E+00 -6.409168E-01 A4 -4.447668E-02 4.442842E-02 1.327452E-02 A6 1.036192E-02 -2.994081E-02 -2.236679E-02 A8 -1.256354E-03 8.118871E-03 6.707407E-03 A10 6.904855E-07 -1.340317E-03 -1.155388E-03 A12 2.282086E-05 1.361315E-04 1.167457E-04 A14 -3.020187E-06 -7.734135E-06 -6.403567E-06 A16 1.553855E-07 1.871928E-07 1.468206E-07 In the third embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

According to Table 5 and Table 6, the following conditional formula values can be obtained: Third embodiment (using the main reference wavelength of 940 nm) MTFE0 MTFE3 MTFE7 MTFQ0 MTFQ3 MTFQ7 0.39 0.22 0.06 0.05 0.07 0.02 ETP1 ETP2 ETP3 ETP4 ETP5 BL 0.694 1.130 0.682 1.111 1.202 1.6419 ETP1/TP1 ETP2/TP2 ETP3/TP3 ETP4/TP4 ETP5/TP5 EBL/BL 0.955 0.714 1.588 0.697 1.003 0.6913 ETL EBL EIN EIR PIR EIN/ETL 8.935 1.135 7.800 0.170 0.780 0.873 SETP/EIN EIR/PIR SETP STP SETP /STP SED /SIN 0.618 0.218 4.820 5.531 0.871 1.376 ED12 ED23 ED34 ED45 SED SIN 0.205 0.433 1.098 1.244 2.980 2.165 ED12/IN12 ED23/IN23 ED34/IN34 ED45/IN45 HVT31 HVT32 0.294 0.423 18.316 3.232 0 0 ∣f/f1│ ∣f/f2│ ∣f/f3│ ∣f/f4│ ∣f/f5│ ∣f1/f2│ 0.19924 0.72336 0.10769 0.20162 1.13435 3.63057 ΣPPR ΣNPR ΣPPR /│ΣNPR∣ IN12 / f IN45 / f ∣f2/f3│ 2.0593 0.3069 6.7094 0.1553 0.0858 0.1489 TP3 / (IN23+TP3+IN34) (TP1+IN12)/ TP2 (TP5+IN45)/ TP4 0.10858 0.28374 0.90038 HOS InTL HOS / HOI InS/ HOS ODT% TDT% 9.33806 7.69612 2.82972 0.85016 3.45797 2.44413 HVT11 HVT12 HVT21 HVT22 HVT31 HVT32 0 0 1.71775 0.750306 0 0 HVT41 HVT42 HVT51 HVT52 HVT52/ HOI HVT52/ HOS 0 0.88550 2.18167 2.37836 0.66111 0.23363 TP2 / TP3 TP3 / TP4 InRS51 InRS52 │InRS51│/TP5 │InRS52│/TP5 3.68437 0.26933 0.470244 0.384968 0.39242 0.32126

According to Table 5 and Table 6, the following conditional formula values can be obtained: The third embodiment is the value related to the inflection point (using the main reference wavelength of 940 nm) HIF121 2.2153 HIF121/HOI 0.6713 SGI121 0.4374 ∣SGI121│/(∣SGI121│+TP1) 0.3755 HIF211 1.0490 HIF211/HOI 0.3179 SGI211 0.1309 │SGI211∣/(│SGI211∣+TP2) 0.0765 HIF221 0.4485 HIF221/HOI 0.1359 SGI221 0.0036 ∣SGI221│/(∣SGI221│+TP2) 0.0023 HIF222 2.4091 HIF222/HOI 0.7300 SGI222 -0.5444 ∣SGI222│/(∣SGI222│+TP2) 0.2561 HIF311 1.5801 HIF311/HOI 0.4788 SGI311 -0.5922 │SGI311∣/(│SGI311∣+TP3) 0.5797 HIF312 1.9528 HIF312/HOI 0.5918 SGI312 -0.8269 │SGI312∣/(│SGI312∣+TP3) 0.6582 HIF321 1.4573 HIF321/HOI 0.4416 SGI321 -0.3967 ∣SGI321│/(∣SGI321│+TP3) 0.4803 HIF322 1.8059 HIF322/HOI 0.5472 SGI322 -0.5535 ∣SGI322│/(∣SGI322│+TP3) 0.5632 HIF411 1.5084 HIF411/HOI 0.4571 SGI411 0.1332 │SGI411∣/(│SGI411∣+TP4) 0.0771 HIF412 2.1733 HIF412/HOI 0.6586 SGI412 0.2150 │SGI412∣/(│SGI412∣+TP4) 0.1188 HIF421 0.4324 HIF421/HOI 0.1310 SGI421 0.0166 ∣SGI421│/(∣SGI421│+TP4) 0.0103 HIF422 2.1929 HIF422/HOI 0.6645 SGI422 -0.2108 ∣SGI422│/(∣SGI422│+TP4) 0.1168 HIF511 1.1222 HIF511/HOI 0.3401 SGI511 0.3165 │SGI511∣/(│SGI511∣+TP5) 0.2089 HIF521 1.2763 HIF521/HOI 0.3867 SGI521 0.3141 ∣SGI521│/(∣SGI521│+TP5) 0.2077

Fourth embodiment Please refer to FIGS. 4A and 4B, in which FIG. 4A shows a schematic diagram of an optical imaging system according to the fourth embodiment of the present creation, and FIG. 4B is from left to right in order for the optical imaging system of the fourth embodiment. Graph of spherical aberration, astigmatism and optical distortion. FIG. 4C is a diagram showing the infrared spectrum modulation conversion characteristic of this embodiment. As can be seen from FIG. 4A, the optical imaging system includes a first lens 410, an aperture 400, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, and an infrared filter in order from the object side to the image side 470, infrared imaging surface 480, and image sensing element 490.

The first lens 410 has positive refractive power and is made of plastic material. Its object side 412 is convex, its image side 414 is convex, and both are aspherical, and both its object side 412 and image side 414 have an inflection point.

The second lens 420 has negative refractive power and is made of plastic material. Its object side 422 is convex, its image side 424 is concave, and both are aspherical, and its object side 422 and image side 424 both have an inflection point.

The third lens 430 has a positive refractive power and is made of plastic. Its object side 432 is convex, its image side 434 is convex, and both are aspherical, and its object side 432 has an inflection point and the image side 434 has two Recurve point.

The fourth lens 440 has a positive refractive power and is made of plastic material. Its object side 442 is concave, its image side 444 is convex, and both are aspherical, and its object side 442 has a tri-reflection point and the image side 444 has a Recurve point.

The fifth lens 450 has negative refractive power and is made of plastic material. Its object side 452 is convex, its image side 454 is concave, and both are aspherical, and its object side 452 and image side 454 both have an inflection point. In this way, it is beneficial to shorten the back focal length to maintain miniaturization.

The infrared filter 470 is made of glass, which is disposed between the fifth lens 450 and the infrared imaging surface 480 and does not affect the focal length of the optical imaging system.

Please refer to Table 7 and Table 8 below. Table 7 Lens data of the fourth embodiment f (focal length) = 3.7375 mm; f/HEP = 0.9; HAF (half viewing angle) = 40.0 deg surface Radius of curvature Thickness (mm) Material Refractive index Dispersion coefficient focal length 0 Subject 1E+18 1E+18 1 First lens 6.639990197 1.132 plastic 1.661 20.390 5.86765 2 -8.404194369 0.292 3 aperture 1E+18 0.026 4 Second lens 5.582903484 0.276 plastic 1.584 29.890 -8.29441 5 2.474329642 0.397 6 Third lens 5.630788647 0.960 plastic 1.661 20.390 6.83377 7 -19.74554188 0.226 8 Fourth lens -2.958448239 1.371 plastic 1.661 20.390 6.31234 9 -2.036680821 0.050 10 Fifth lens 2.621058282 0.900 plastic 1.661 20.390 -33.3476 11 2.022023734 0.719 12 Infrared filter 1E+18 0.215 BK_7 13 1E+18 0.750 14 Infrared imaging surface 1E+18 0.000 The reference wavelength is 940 nm; the light blocking position: the clear radius of the first face is 2.650 mm; the clear radius of the seventh face is 2.240 mm; the clear radius of the eleventh face is 3.200 mm Table 8. Aspheric coefficients of the fourth embodiment Table 8 Aspheric coefficient surface 1 2 4 5 6 7 8 k 3.860456E+00 -6.741883E+01 2.143984E+00 -2.688272E-01 -7.753847E+00 -1.574199E+01 -2.779203E+00 A4 -7.549090E-03 -8.038252E-04 -6.189103E-02 -1.035005E-01 -8.835968E-03 3.435062E-02 7.156201E-02 A6 3.907000E-03 9.724105E-04 5.407646E-02 3.691991E-02 -2.408256E-02 -9.770166E-04 -3.430538E-02 A8 -2.169167E-03 8.740952E-04 -4.810557E-02 -1.556006E-02 2.476770E-02 -1.154149E-03 2.931102E-02 A10 6.848064E-04 -6.349056E-04 3.097083E-02 3.277084E-03 -2.304949E-02 -2.854454E-03 -1.654238E-02 A12 -1.215338E-04 1.812762E-04 -1.214271E-02 -4.090561E-04 1.062859E-02 1.200497E-03 4.383475E-03 A14 1.174107E-05 -2.342057E-05 2.492343E-03 7.761500E-05 -2.245366E-03 -1.755367E-04 -5.372325E-04 A16 -4.797204E-07 1.119576E-06 -2.075099E-04 -1.206673E-05 1.760683E-04 9.053857E-06 2.502191E-05 Table 8 Aspheric coefficient surface 9 10 11 k -1.265437E+00 -2.588700E+00 -5.943835E+00 A4 3.948290E-02 -1.979829E-02 -2.376332E-03 A6 -3.057765E-02 1.606013E-02 1.307309E-02 A8 1.745063E-02 -9.004992E-03 -8.089183E-03 A10 -6.595221E-03 2.150697E-03 1.886571E-03 A12 1.508809E-03 -2.517956E-04 -2.191968E-04 A14 -1.864643E-04 1.413413E-05 1.276560E-05 A16 9.954648E-06 -2.945607E-07 -2.986422E-07

In the fourth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

According to Table 7 and Table 8, the following conditional formula values can be obtained: Fourth embodiment (using the main reference wavelength of 940 nm) MTFE0 MTFE3 MTFE7 MTFQ0 MTFQ3 MTFQ7 0.09 0.09 0.16 0.07 0.02 0.06 ETP1 ETP2 ETP3 ETP4 ETP5 BL 0.788 0.259 1.068 0.912 0.992 1.5828 ETP1/TP1 ETP2/TP2 ETP3/TP3 ETP4/TP4 ETP5/TP5 EBL/BL 0.696 0.937 1.112 0.665 1.102 0.7436 ETL EBL EIN EIR PIR EIN/ETL 7.068 1.177 5.891 0.212 0.719 0.834 SETP/EIN EIR/PIR SETP STP SETP /STP SED /SIN 0.682 0.294 4.019 4.640 0.866 1.890 ED12 ED23 ED34 ED45 SED SIN 0.412 0.211 0.093 1.156 1.872 0.991 ED12/IN12 ED23/IN23 ED34/IN34 ED45/IN45 HVT31 HVT32 1.298 0.533 0.410 22.992 1.10775 0 ∣f/f1│ ∣f/f2│ ∣f/f3│ ∣f/f4│ ∣f/f5│ ∣f1/f2│ 0.63697 0.45061 0.54692 0.59210 0.11208 0.70742 ΣPPR ΣNPR ΣPPR /│ΣNPR∣ IN12 / f IN45 / f ∣f2/f3│ 1.1548 1.1839 0.9754 0.0849 0.0135 1.2137 TP3 / (IN23+TP3+IN34) (TP1+IN12)/ TP2 (TP5+IN45)/ TP4 0.60651 5.25513 0.69343 HOS InTL HOS / HOI InS/ HOS ODT% TDT% 7.21294 5.63017 2.18574 0.80259 3.9371 2.63497 HVT11 HVT12 HVT21 HVT22 HVT31 HVT32 0 1.83879 1.49617 1.30353 1.10775 0 HVT41 HVT42 HVT51 HVT52 HVT52/ HOI HVT52/ HOS 2.14095 2.15748 2.16966 2.24000 0.65747 0.30080 TP2 / TP3 TP3 / TP4 InRS51 InRS52 │InRS51│/TP5 │InRS52│/TP5 0.28725 0.70058 0.409379 0.411832 0.45474 0.45746

According to Table 7 and Table 8, the following conditional formula values can be obtained: The fourth embodiment is the value related to the inflection point (using the main reference wavelength of 940 nm) HIF111 2.6272 HIF111/HOI 0.7961 SGI111 0.5782 │SGI111∣/(│SGI111∣+TP1) 0.3380 HIF121 1.0656 HIF121/HOI 0.3229 SGI121 -0.054446 ∣SGI121│/(∣SGI121│+TP1) 0.0459 HIF211 0.8371 HIF211/HOI 0.2537 SGI211 0.0445 │SGI211∣/(│SGI211∣+TP2) 0.1390 HIF221 0.7159 HIF221/HOI 0.2169 SGI221 0.0820262 ∣SGI221│/(∣SGI221│+TP2) 0.2292 HIF311 0.7078 HIF311/HOI 0.2145 SGI311 0.0390949 │SGI311∣/(│SGI311∣+TP3) 0.0391 HIF321 0.3514 HIF321/HOI 0.1065 SGI321 -0.0026 ∣SGI321│/(∣SGI321│+TP3) 0.0027 HIF322 1.1479 HIF322/HOI 0.3479 SGI322 0.0148 ∣SGI322│/(∣SGI322│+TP3) 0.0152 HIF411 0.6964 HIF411/HOI 0.2110 SGI411 -0.065894 │SGI411∣/(│SGI411∣+TP4) 0.0459 HIF412 1.3042 HIF412/HOI 0.3952 SGI412 -0.1323 │SGI412∣/(│SGI412∣+TP4) 0.0880 HIF413 1.8697 HIF413/HOI 0.5666 SGI413 -0.2313 │SGI413∣/(│SGI413∣+TP4) 0.1444 HIF421 1.7423 HIF421/HOI 0.5280 SGI421 -0.6124 ∣SGI421│/(∣SGI421│+TP4) 0.3088 HIF511 1.2516 HIF511/HOI 0.3793 SGI511 0.251587 │SGI511∣/(│SGI511∣+TP5) 0.2184 HIF521 1.3168 HIF521/HOI 0.3990 SGI521 0.322797 ∣SGI521│/(∣SGI521│+TP5) 0.2639

Fifth embodiment Please refer to FIGS. 5A and 5B, wherein FIG. 5A shows a schematic diagram of an optical imaging system according to the fifth embodiment of the present invention, and FIG. 5B is the optical imaging system of the fifth embodiment in order from left to right. Graph of spherical aberration, astigmatism and optical distortion. FIG. 5C is a characteristic diagram of infrared spectrum modulation conversion in this embodiment. As can be seen from FIG. 5A, the optical imaging system includes, from the object side to the image side, a first lens 510, an aperture 500, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, and an infrared filter 570, an infrared imaging surface 580, and an image sensing element 590.

The first lens 510 has positive refractive power and is made of plastic material. Its object side 512 is convex, and its image side 514 is convex, and both are aspherical.

The second lens 520 has a negative refractive power and is made of plastic. Its object side 522 is convex, its image side 524 is concave, and both are aspherical, and its object side 522 and image side 524 both have an inflection point.

The third lens 530 has a positive refractive power and is made of plastic material. Its object side 532 is convex, its image side 534 is convex, and both are aspherical, and its object side 532 has an inflexion point.

The fourth lens 540 has positive refractive power and is made of plastic material. Its object side 542 is concave, its image side 544 is convex, and both are aspherical, and both its image side 544 and image side 544 have an inflection point.

The fifth lens 550 has a positive refractive power and is made of plastic material. Its object side 552 is convex, its image side 554 is concave, and both are aspherical, and both its image side 554 and image side 554 have an inflection point. In this way, it is beneficial to shorten the back focal length to maintain miniaturization.

The infrared filter 570 is made of glass, which is disposed between the fifth lens 550 and the infrared imaging surface 580 and does not affect the focal length of the optical imaging system.

Please refer to Table 9 and Table 10 below. Table 9 Lens data of the fifth embodiment f (focal length) = 3.7323 mm; f/HEP = 1.3; HAF (half angle of view) = 40.0 deg surface Radius of curvature Thickness (mm) Material Refractive index Dispersion coefficient focal length 0 Subject 1E+18 1E+18 1 First lens 13.69792597 0.502 plastic 1.661 20.390 9.76332 2 -11.73817016 0.025 3 aperture 1E+18 0.025 4 Second lens 2.90908358 0.416 plastic 1.661 20.390 -67.1252 5 2.573850988 0.582 6 Third lens 11.78078656 1.160 plastic 1.661 20.390 9.38263 7 -12.2516735 0.511 8 Fourth lens -1.701375863 0.824 plastic 1.661 20.390 12.2112 9 -1.669988314 0.050 10 Fifth lens 1.711982254 0.866 plastic 1.661 20.390 28.5378 11 1.508741986 0.839 12 Infrared filter 1E+18 0.215 1.517 64.13 13 1E+18 0.750 14 Infrared imaging surface 1E+18 0.000 The reference wavelength is 940 nm; light blocking position: the clear radius of the face 7 is 2.240 mm; the clear radius of the face 11 is 3.200 mm Table 10. Aspheric coefficients of the fifth embodiment Table 10 Aspheric coefficients surface 1 2 4 5 6 7 8 k -9.000000E+01 -8.999353E+01 -1.834303E-01 -1.281539E-01 -1.829434E+01 2.766666E+01 -6.228892E+00 A4 1.668066E-02 0.000000E+00 -6.635996E-02 -8.777918E-02 -1.651917E-02 1.506490E-02 -2.304016E-04 A6 -4.575165E-03 0.000000E+00 9.908556E-03 1.408125E-04 -2.424212E-02 -1.750159E-02 -2.354460E-02 A8 -4.244476E-03 0.000000E+00 6.213225E-03 1.172314E-02 2.374257E-02 1.578092E-02 3.277495E-02 A10 5.251807E-03 0.000000E+00 -1.489843E-02 -1.709067E-02 -2.463636E-02 -9.784463E-03 -1.709753E-02 A12 -2.429540E-03 0.000000E+00 1.106141E-02 1.033375E-02 1.131118E-02 2.750614E-03 4.321690E-03 A14 5.337470E-04 0.000000E+00 -4.015732E-03 -3.034933E-03 -2.229627E-03 -3.542046E-04 -5.284499E-04 A16 -4.607969E-05 0.000000E+00 5.675739E-04 3.592691E-04 1.523757E-04 1.701515E-05 2.527004E-05 Table 10 Aspheric coefficients surface 9 10 11 k -3.260151E+00 -1.854287E+00 -7.848022E-01 A4 -5.474072E-02 -6.500228E-02 -1.082420E-01 A6 2.050674E-02 2.721995E-02 3.551303E-02 A8 -1.288539E-03 -8.524146E-03 -1.060399E-02 A10 -2.633605E-03 1.558680E-03 2.015819E-03 A12 1.436740E-03 -1.616950E-04 -2.366056E-04 A14 -2.926964E-04 8.031032E-06 1.536828E-05 A16 2.182593E-05 -1.050004E-07 -4.249358E-07

In the fifth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

According to Table 9 and Table 10, the following conditional formula values can be obtained: Fifth embodiment (using the main reference wavelength of 940 nm) MTFE0 MTFE3 MTFE7 MTFQ0 MTFQ3 MTFQ7 0.86 0.73 0.7 0.67 0.34 0.47 ETP1 ETP2 ETP3 ETP4 ETP5 BL 0.334 0.343 1.186 0.624 0.919 1.7074 ETP1/TP1 ETP2/TP2 ETP3/TP3 ETP4/TP4 ETP5/TP5 EBL/BL 0.665 0.825 1.022 0.757 1.061 0.7959 ETL EBL EIN EIR PIR EIN/ETL 6.668 1.359 5.309 0.394 0.839 0.796 SETP/EIN EIR/PIR SETP STP SETP /STP SED /SIN 0.642 0.470 3.406 3.767 0.904 1.595 ED12 ED23 ED34 ED45 SED SIN 0.253 0.390 0.235 1.025 1.903 1.193 ED12/IN12 ED23/IN23 ED34/IN34 ED45/IN45 HVT31 HVT32 5.066 0.669 0.461 20.492 0.802735 0 ∣f/f1│ ∣f/f2│ ∣f/f3│ ∣f/f4│ ∣f/f5│ ∣f1/f2│ 0.38228 0.05560 0.39779 0.30565 0.13079 0.14545 ΣPPR ΣNPR ΣPPR /│ΣNPR∣ IN12 / f IN45 / f ∣f2/f3│ 0.4920 0.7801 0.6308 0.0134 0.0134 7.1542 TP3 / (IN23+TP3+IN34) (TP1+IN12)/ TP2 (TP5+IN45)/ TP4 0.51473 1.32626 1.11225 HOS InTL HOS / HOI InS/ HOS ODT% TDT% 6.66816 4.96072 2.02065 0.92100 3.35224 1.21318 HVT11 HVT12 HVT21 HVT22 HVT31 HVT32 0 0 1.29877 1.1141 0.802735 0 HVT41 HVT42 HVT51 HVT52 HVT52/ HOI HVT52/ HOS 2.03371 2.00425 2.09732 2.30622 0.63555 0.31453 TP2 / TP3 TP3 / TP4 InRS51 InRS52 │InRS51│/TP5 │InRS52│/TP5 0.35871 1.40841 0.40586 0.424344 0.46868 0.49002

According to Table 9 and Table 10, the following conditional formula values can be obtained: Fifth embodiment inverse curve related value (using the main reference wavelength of 940 nm) HIF211 0.7617 HIF211/HOI 0.2308 SGI211 0.0808161 │SGI211∣/(│SGI211∣+TP2) 0.1626 HIF221 0.6457 HIF221/HOI 0.1957 SGI221 0.0671 ∣SGI221│/(∣SGI221│+TP2) 0.1388 HIF311 0.4989 HIF311/HOI 0.1512 SGI311 0.0091551 │SGI311∣/(│SGI311∣+TP3) 0.0078 HIF411 1.0798 HIF411/HOI 0.3272 SGI411 -0.2526 │SGI411∣/(│SGI411∣+TP4) 0.2347 HIF421 1.4306 HIF421/HOI 0.4335 SGI421 -0.568273 ∣SGI421│/(∣SGI421│+TP4) 0.4083 HIF511 1.1520 HIF511/HOI 0.3491 SGI511 0.2843 │SGI511∣/(│SGI511∣+TP5) 0.2471 HIF521 1.2031 HIF521/HOI 0.3646 SGI521 0.3425 ∣SGI521│/(∣SGI521│+TP5) 0.2834

Sixth embodiment Please refer to FIGS. 6A and 6B, in which FIG. 6A shows a schematic diagram of an optical imaging system according to the sixth embodiment of the present creation, and FIG. 6B is from left to right in order for the optical imaging system of the sixth embodiment. Graph of spherical aberration, astigmatism and optical distortion. FIG. 6C is a characteristic diagram of infrared light spectrum modulation conversion in this embodiment. As can be seen from FIG. 6A, the optical imaging system includes a first lens 610, a second lens 620, an aperture 600, a third lens 630, a fourth lens 640, a fifth lens 650, and an infrared filter in order from the object side to the image side 670. Infrared imaging surface 680 and image sensing element 690.

The first lens 610 has a negative refractive power and is made of plastic. Its object side 612 is concave, its image side 614 is concave, and both are aspherical, and its object side 612 has an inflexion point.

The second lens 620 has a positive refractive power and is made of plastic material. Its object side 622 is convex, and its image side 624 is concave, and both are aspherical.

The third lens 630 has positive refractive power and is made of plastic material. Its object side 632 is convex, its image side 634 is convex, and both are aspherical, and its object side 632 has an inflexion point.

The fourth lens 640 has a positive refractive power and is made of plastic material. Its object side 642 is concave, its image side 644 is convex, and both are aspherical, and its object side 632 and image side 644 both have an inflection point.

The fifth lens 650 has negative refractive power and is made of plastic material. Its object side 652 is convex, its image side 654 is concave, and both are aspherical, and both its object side 652 and image side 644 have an inflection point. In this way, it is beneficial to shorten the back focal length to maintain miniaturization. In addition, it can also effectively suppress the angle of incidence of the off-axis field of view, and can further correct the aberration of the off-axis field of view.

The infrared filter 670 is made of glass, which is disposed between the fifth lens 650 and the infrared imaging surface 680 and does not affect the focal length of the optical imaging system.

Please refer to Table 11 and Table 12 below. Table 11: Lens data of the sixth embodiment f (focal length) = 3.1259 mm; f/HEP = 1.3; HAF (half angle of view) = 45.8012 deg surface Radius of curvature Thickness (mm) Material Refractive index Dispersion coefficient focal length 0 Subject 1E+18 1E+18 1 First lens -10.05209031 0.300 plastic 1.661 20.390 -3.74176 2 3.262965631 0.371 3 Second lens 2.164609314 0.603 plastic 1.661 20.390 4.27224 4 8.618919172 1.058 5 aperture 1E+18 0.438 6 Third lens 15.98454745 1.382 plastic 1.661 20.390 4.74317 7 -3.707216122 1.442 8 Fourth lens -2.65419837 0.592 plastic 1.661 20.390 9.77548 9 -2.039356685 0.025 10 Fifth lens 2.116197716 0.872 plastic 1.661 20.390 -79.5084 11 1.702583506 0.703 12 Infrared filter 1E+18 0.215 BK_7 1.517 64.13 13 1E+18 0.750 14 Infrared imaging surface 1E+18 0.000 The reference wavelength is 940 nm; the light blocking position: the clear radius of the first face is 3.750 mm; the clear radius of the eighth face is 2.200 mm; the clear radius of the eleventh face is 3.150 mm Table 12. Aspheric coefficients of the sixth embodiment Table 12 Aspheric coefficients surface 1 2 3 4 6 7 8 k -4.388763E+00 -9.861234E-02 -5.303288E-01 2.082031E+01 -2.800078E+01 -2.026502E+00 -1.937394E+00 A4 1.583807E-02 -4.046074E-02 -2.263208E-02 4.549734E-02 -3.285306E-03 -8.490334E-03 6.879109E-02 A6 7.635954E-04 2.970980E-02 7.949813E-03 -4.719477E-02 2.402142E-03 -4.610214E-05 -5.679364E-02 A8 -1.081049E-03 -1.488603E-02 4.639826E-03 6.721614E-02 -3.000109E-03 -4.145148E-04 3.015703E-02 A10 2.557801E-04 4.016857E-03 -4.419942E-03 -4.762429E-02 1.566111E-03 5.765182E-05 -9.733632E-03 A12 -2.889000E-05 -6.033827E-04 1.241969E-03 1.856408E-02 -4.572590E-04 1.009566E-05 1.930755E-03 A14 1.635983E-06 4.806011E-05 -1.349240E-04 -3.791093E-03 6.585500E-05 -5.089814E-06 -2.096630E-04 A16 -3.641999E-08 -1.575257E-06 3.759921E-06 3.269176E-04 -3.598493E-06 4.189958E-07 9.442000E-06 Table 12 Aspheric coefficients surface 9 10 11 k -1.073361E+00 -4.782827E-01 -1.317170E+00 A4 2.125608E-02 -8.490463E-02 -8.665980E-02 A6 -6.895599E-03 2.402824E-02 3.239299E-02 A8 3.243184E-03 -6.669311E-03 -9.496669E-03 A10 -8.400800E-04 1.091283E-03 1.806951E-03 A12 1.705811E-04 -9.896273E-05 -2.093190E-04 A14 -1.626733E-05 4.007586E-06 1.327478E-05 A16 5.190320E-07 -6.523434E-08 -3.545020E-07

In the sixth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.

According to Table 11 and Table 12, the following conditional formula values can be obtained: Sixth embodiment (using the main reference wavelength of 940 nm) MTFE0 MTFE3 MTFE7 MTFQ0 MTFQ3 MTFQ7 0.67 0.17 0.57 0.25 0.05 0.28 ETP1 ETP2 ETP3 ETP4 ETP5 BL 0.541 0.438 1.118 0.468 0.940 1.5707 ETP1/TP1 ETP2/TP2 ETP3/TP3 ETP4/TP4 ETP5/TP5 EBL/BL 1.804 0.727 0.808 0.791 1.079 0.8659 ETL EBL EIN EIR PIR EIN/ETL 8.790 1.360 7.430 0.394 0.703 0.845 SETP/EIN EIR/PIR SETP STP SETP /STP SED /SIN 0.472 0.561 3.506 3.749 0.935 1.177 ED12 ED23 ED34 ED45 SED SIN 0.519 1.350 1.453 0.603 3.924 3.334 ED12/IN12 ED23/IN23 ED34/IN34 ED45/IN45 HVT31 HVT32 1.399 0.902 1.007 24.132 0 0 ∣f/f1│ ∣f/f2│ ∣f/f3│ ∣f/f4│ ∣f/f5│ ∣f1/f2│ 0.83542 0.73169 0.65904 0.31977 0.03932 0.87583 ΣPPR ΣNPR ΣPPR /│ΣNPR∣ IN12 / f IN45 / f ∣f2/f3│ 1.4300 1.1552 1.2379 0.1186 0.0080 0.9007 TP3 / (IN23+TP3+IN34) (TP1+IN12)/ TP2 (TP5+IN45)/ TP4 0.31997 1.11291 1.51478 HOS InTL HOS / HOI InS/ HOS ODT% TDT% 8.65290 7.08216 2.62209 0.73063 2.65618 2.2625 HVT11 HVT12 HVT21 HVT22 HVT31 HVT32 1.31587 0 0 0 0 0 HVT41 HVT42 HVT51 HVT52 HVT52/ HOI HVT52/ HOS 1.93589 1.98905 1.91389 2.25556 0.57997 0.22118 TP2 / TP3 TP3 / TP4 InRS51 InRS52 │InRS51│/TP5 │InRS52│/TP5 0.43593 2.33550 0.170615 0.197312 0.19575 0.22638

According to Table 11 and Table 12, the following conditional formula values can be obtained: Sixth embodiment inverse curve related value (main reference wavelength 940 nm is used) HIF111 0.7168 HIF111/HOI 0.2172 SGI111 -0.0212 │SGI111∣/(│SGI111∣+TP1) 0.0661 HIF311 1.0598 HIF311/HOI 0.3212 SGI311 0.0307 │SGI311∣/(│SGI311∣+TP3) 0.0217 HIF411 1.3392 HIF411/HOI 0.4058 SGI411 -0.2420 │SGI411∣/(│SGI411∣+TP4) 0.2902 HIF421 1.4089 HIF421/HOI 0.4269 SGI421 -0.4196 ∣SGI421│/(∣SGI421│+TP4) 0.4148 HIF511 0.9674 HIF511/HOI 0.2931 SGI511 0.1684 │SGI511∣/(│SGI511∣+TP5) 0.1619 HIF521 1.0864 HIF521/HOI 0.3292 SGI521 0.2538 ∣SGI521│/(∣SGI521│+TP5) 0.2255

Although this creation has been disclosed as above by way of implementation, it is not intended to limit this creation. Anyone who is familiar with this skill can make various changes and modifications within the spirit and scope of this creation, so the protection of this creation is protected The scope shall be determined by the scope of the attached patent application.

Although this creation has been specifically shown and described with reference to its exemplary embodiments, it will be understood by those of ordinary skill in the art that it does not deviate from the spirit of this creation as defined by the following patent applications and their equivalents Various changes in form and detail can be made under the category.

10,20,30,40,50,60: optical imaging system 100,200,300,400,500,600: aperture 110,210,310,410,510,610: the first lens 112,212,312,412,512,612: Object side 114,214,314,414,514,614: like profile 120,220,320,420,520,620: second lens 122,222,322,422,522,622: Object side 124,224,324,424,524,624: like side 130,230,330,430,530,630: third lens 132,232,332,432,532,632: object side 134,234,334,434,534,634: like profile 140,240,340,440,540,640: fourth lens 142,242,342,442,542,642: Object side 144,244,344,444,544,644: like side 150,250,350,450,550,650: fifth lens 152,252,352,452,552,652: Object side 154,254,354,454,554,654: like profile 170,270,370,470,570,670: Infrared filter 180,280,380,480,580,680: infrared imaging surface 190,290,390,490,590,690: image sensing element f: focal length of optical imaging system f1: focal length of the first lens f2: focal length of the second lens f3: focal length of the third lens f4: focal length of the fourth lens f5: focal length of the fifth lens f/HEP: Aperture value of optical imaging system HAF: half of the maximum angle of view of the optical imaging system NA1: dispersion coefficient of the first lens NA2, NA3, NA4, NA5: the dispersion coefficient of the second lens to the fifth lens R1, R2: radius of curvature of the object side and image side of the first lens R3, R4: radius of curvature of the object side and image side of the second lens R5, R6: radius of curvature of the object side and image side of the third lens R7, R8: radius of curvature of the object side and image side of the fourth lens R9, R10: radius of curvature of the object side and image side of the fifth lens TP1: the thickness of the first lens on the optical axis TP2, TP3, TP4, TP5: the thickness of the second to fifth lenses on the optical axis ΣTP: the sum of the thickness of all lenses with refractive power IN12: the distance between the first lens and the second lens on the optical axis IN23: the distance between the second lens and the third lens on the optical axis IN34: the distance between the third lens and the fourth lens on the optical axis IN45: the distance between the fourth lens and the fifth lens on the optical axis InRS51: the horizontal displacement distance from the intersection point of the fifth lens object side on the optical axis to the maximum effective radius position of the fifth lens object side on the optical axis IF511: the inflection point closest to the optical axis on the side of the fifth lens object SGI511: IF511 subsidence HIF511: the vertical distance between the reflex point closest to the optical axis and the optical axis on the side of the fifth lens object IF521: the inflection point closest to the optical axis on the image side of the fifth lens SGI521: IF521 subsidence HIF521: the vertical distance between the reflex point closest to the optical axis on the image side of the fifth lens and the optical axis IF512: the second reflex point close to the optical axis on the object side of the fifth lens SGI512: IF512 subsidence HIF512: The vertical distance between the inflection point of the second lens object side near the optical axis and the optical axis IF522: the second reflex point close to the optical axis on the image side of the fifth lens SGI522: IF522 sinking amount HIF522: the vertical distance between the reflex point of the fifth lens image side near the optical axis and the optical axis C51: Critical point on the side of the fifth lens object C52: Critical point on the side of the fifth lens image SGC51: The horizontal displacement distance between the critical point on the side of the fifth lens object and the optical axis SGC52: The horizontal displacement distance between the critical point on the image side of the fifth lens and the optical axis HVT51: The vertical distance between the critical point on the side of the fifth lens object and the optical axis HVT52: The vertical distance between the critical point on the image side of the fifth lens and the optical axis HOS: total height of the system (distance from the side of the first lens object to the infrared imaging surface on the optical axis) InS: distance from aperture to infrared imaging surface InTL: distance from the object side of the first lens to the image side of the fifth lens InB: the distance from the side of the fifth lens image to the infrared imaging surface HOI: The image sensor effectively senses half the diagonal length of the area (maximum image height) TDT: TV Distortion of Optical Imaging System at the Formation of Image (TV Distortion) ODT: Optical Distortion of Optical Imaging System at the End of Image Formation (Optical Distortion)

The above and other features of this creation will be explained in detail by referring to the drawings. FIG. 1A is a schematic diagram showing the optical imaging system of the first embodiment of the present creation; FIG. 1B is a graph showing the spherical aberration, astigmatism, and optical distortion of the optical imaging system of the first embodiment of the present invention in order from left to right; FIG. 1C is a diagram showing the infrared spectrum modulation conversion characteristics of the optical imaging system of the first embodiment of the present invention; FIG. 2A is a schematic diagram showing the optical imaging system of the second embodiment of the present invention; Figure 2B is a graph showing the spherical aberration, astigmatism, and optical distortion of the optical imaging system of the second embodiment of the present invention in order from left to right; FIG. 2C is a diagram showing the infrared spectrum modulation conversion characteristics of the optical imaging system of the second embodiment of the present invention; FIG. 3A is a schematic diagram showing the optical imaging system of the third embodiment of the present invention; FIG. 3B shows the graphs of spherical aberration, astigmatism, and optical distortion of the optical imaging system of the third embodiment in this order from left to right; FIG. 3C is a diagram showing infrared spectrum modulation conversion characteristics of the optical imaging system of the third embodiment of the present invention; FIG. 4A is a schematic diagram showing the optical imaging system of the fourth embodiment of the present invention; FIG. 4B shows the graphs of spherical aberration, astigmatism, and optical distortion of the optical imaging system of the fourth embodiment in this order from left to right; FIG. 4C is a diagram showing the infrared spectrum modulation conversion characteristics of the optical imaging system of the fourth embodiment of the present invention; FIG. 5A is a schematic diagram showing the optical imaging system of the fifth embodiment of the present invention; FIG. 5B shows the graphs of spherical aberration, astigmatism, and optical distortion of the optical imaging system of the fifth embodiment in this order from left to right; FIG. 5C is a diagram showing the infrared spectrum modulation conversion characteristics of the optical imaging system of the fifth embodiment of the present invention; FIG. 6A is a schematic diagram showing the optical imaging system of the sixth embodiment of the present invention; FIG. 6B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the sixth embodiment of the present invention in order from left to right; FIG. 6C is a diagram showing the infrared spectrum modulation conversion characteristics of the optical imaging system of the sixth embodiment of the present invention.

30: Optical imaging system

300: aperture

310: the first lens

312: Object side

314: like side

320: second lens

322: Object side

324: like side

330: third lens

332: Object side

334: like side

340: fourth lens

342: Object side

344: like side

350: fifth lens

352: Object side

354: like side

370: Infrared filter

380: Infrared imaging surface

390: Image sensor

Claims (25)

An optical imaging system, in order from the object side to the image side, includes: A first lens with refractive power; A second lens with refractive power; A third lens with refractive power; A fourth lens with refractive power; A fifth lens with refractive power; and An infrared imaging surface, wherein the optical imaging system has five lenses with refractive power, and at least one of the first lens to the fifth lens has positive refractive power, and the focal length of the optical imaging system is f, the The diameter of the entrance pupil of the optical imaging system is HEP, the distance from the object side of the first lens to the imaging surface of the infrared light is a distance HOS on the optical axis, and half of the maximum viewing angle of the optical imaging system is HAF. The thickness of the fifth lens at the height of 1/2 HEP and parallel to the optical axis is ETP1, ETP2, ETP3, ETP4, and ETP5, respectively. The sum of the foregoing ETP1 to ETP5 is SETP. Thicknesses are TP1, TP2, TP3, TP4 and TP5, respectively. The sum of TP1 to TP5 is STP, which meets the following conditions: 0.5≦f/HEP≦1.8; 0 deg>HAF≦50 deg and 0.5≦SETP/STP >1 . The optical imaging system according to claim 1, wherein the wavelength of the infrared light is between 850 nm and 960 nm and the first spatial frequency is represented by SP1, which satisfies the following condition: SP1≦220 cycles/mm. The optical imaging system according to claim 1, wherein the horizontal distance between the coordinate point at the height of 1/2 HEP on the side of the first lens object and the infrared light imaging plane parallel to the optical axis is ETL, and the first lens object The horizontal distance between the coordinate point at the height of 1/2 HEP on the side and the coordinate point at the height of 1/2 HEP on the side of the fifth lens image parallel to the optical axis is EIN, which satisfies the following conditions: 0.2≦EIN/ETL> 1. The optical imaging system according to claim 1, wherein the following formula is satisfied: 0.3≦SETP/EIN>1. The optical imaging system according to claim 1, wherein the optical axis of the infrared light on the imaging surface of the infrared light, 0.3HOI and 0.7HOI are at a spatial frequency of 55 cycles/mm modulation conversion contrast transfer rate (MTF value) respectively MTFE0, MTFE3 and MTFE7 indicate that they meet the following conditions: MTFE0≧0.01; MTFE3≧0.01; and MTFE7≧0.01. The optical imaging system according to claim 1, wherein the distance between the first lens and the second lens on the optical axis is IN12, and the distance between the fourth lens and the fifth lens on the optical axis is IN45, which meets the following conditions: IN12> IN45. The optical imaging system according to claim 1, wherein the distance between the second lens and the third lens on the optical axis is IN23, and the distance between the fourth lens and the fifth lens on the optical axis is IN45, which meets the following conditions: IN23> IN45. The optical imaging system according to claim 1, wherein the distance between the third lens and the fourth lens on the optical axis is IN34, and the distance between the fourth lens and the fifth lens on the optical axis is IN45, which meets the following conditions: IN34> IN45. The optical imaging system according to claim 1, further comprising an aperture, and a distance InS on the optical axis from the aperture to the infrared imaging surface, which satisfies the following formula: 0.2≦InS/HOS≦1.1. An optical imaging system, in order from the object side to the image side, includes: A first lens with refractive power; A second lens with refractive power; A third lens with refractive power; A fourth lens with refractive power; A fifth lens with refractive power; and An infrared imaging surface, wherein the optical imaging system has five lenses with refractive power, and at least one surface of at least one lens from the first lens to the fifth lens has at least one inflection point. The focal length is f, the entrance pupil diameter of the optical imaging system is HEP, the first lens object side surface and the infrared light imaging surface have a distance HOS on the optical axis, and half of the maximum viewing angle of the optical imaging system is HAF. The horizontal distance between the coordinate point at the height of 1/2 HEP on the object side of the first lens and the infrared light imaging plane parallel to the optical axis is ETL, and the coordinate point at the height of 1/2 HEP on the object side of the first lens is to the The horizontal distance between the coordinate points at the height of 1/2 HEP on the image side of the fifth lens parallel to the optical axis is EIN, which satisfies the following conditions: 0.5≦f/HEP≦1.5; 0 deg>HAF≦50 deg and 0.2≦EIN /ETL> 1. The optical imaging system according to claim 10, wherein the optical axis of infrared light on the imaging surface of the infrared light, 0.3 HOI and 0.7 HOI are at a spatial frequency of 110 cycles/mm modulation conversion contrast transfer rate (MTF value) respectively MTFQ0, MTFQ3 and MTFQ7 indicate that they meet the following conditions: MTFQ0≧0.01; MTFQ3≧0.01; and MTFQ7≧0.01. The optical imaging system according to claim 10, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the infrared imaging surface, which satisfies the following conditions: 0.5≦HOS/HOI≦3. The optical imaging system according to claim 10, further comprising an aperture, the aperture is located behind the image side of the first lens. The optical imaging system according to claim 10, wherein the image side of the fourth lens is convex on the optical axis. The optical imaging system according to claim 10, wherein the object side of the fifth lens is concave on the optical axis and the image side is convex on the optical axis. The optical imaging system according to claim 10, wherein the object side of the second lens is convex on the optical axis. The optical imaging system according to claim 10, wherein the coordinate point at the height of 1/2 HEP on the image side of the fourth lens to the coordinate point at the height of 1/2 HEP on the object side of the fifth lens is parallel to the optical axis The horizontal distance is ED45, and the distance between the fourth lens and the fifth lens on the optical axis is IN45, which satisfies the following conditions: 0>ED45/IN45≦50. The optical imaging system according to claim 10, wherein the coordinate point at the height of 1/2 HEP on the image side of the first lens to the coordinate point at the height of 1/2 HEP on the object side of the second lens is parallel to the optical axis The horizontal distance is ED12, and the distance between the first lens and the second lens on the optical axis is IN12, which satisfies the following conditions: 0>ED12/IN12≦10. The optical imaging system according to claim 10, wherein the thickness of the fifth lens at a height of 1/2 HEP and parallel to the optical axis is ETP5, and the thickness of the fifth lens on the optical axis is TP5, which satisfies the following conditions: 0> ETP5/ TP5≦5. An optical imaging system, in order from the object side to the image side, includes: A first lens with refractive power; A second lens with refractive power; A third lens with refractive power; A fourth lens with refractive power; A fifth lens with refractive power; and An infrared imaging surface, wherein the optical imaging system has five lenses with refractive power, and at least two surfaces of at least two of the first lens to the fifth lens have at least one inflection point, the optical imaging The focal length of the system is f, the diameter of the entrance pupil of the optical imaging system is HEP, the distance from the object side of the first lens to the imaging surface of the infrared light is a distance HOS on the optical axis, and half of the maximum viewing angle of the optical imaging system is HAF , The optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the infrared imaging surface, the coordinate point at the height of 1/2 HEP on the object side of the first lens to the infrared imaging surface is parallel to the optical axis The horizontal distance is ETL, and the horizontal distance between the coordinate point at the height of 1/2 HEP on the object side of the first lens and the coordinate point at the height of 1/2 HEP on the image side of the fifth lens is EIN, It satisfies the following conditions: 0.5≦f/HEP≦1.3; 10 deg≦HAF≦50 deg; and 0.2≦EIN/ETL> 1. The optical imaging system according to claim 20, wherein the optical imaging system satisfies the following formula: 0 mm>HOS≦10 mm. The optical imaging system according to claim 20, wherein the wavelength of the infrared light is between 850 nm and 960 nm and the first spatial frequency is represented by SP1, which satisfies the following condition: SP1≦220 cycles/mm. The optical imaging system according to claim 20, wherein the materials of the first lens to the fifth lens are plastic. The optical imaging system according to claim 20, wherein the distance between the first lens and the second lens on the optical axis is IN12, and the distance between the second lens and the third lens on the optical axis is IN23, the distance between the third lens and the fourth lens on the optical axis is IN34, and the distance between the fourth lens and the fifth lens on the optical axis is IN45, which satisfies the following conditions: IN12> IN45 ; IN34> IN45; and IN23> IN45. The optical imaging system according to claim 20, wherein the optical imaging system further includes an aperture, an image sensing element, and a driving module, the image sensing element is disposed on the infrared imaging surface, and extends from the aperture to The infrared imaging surface has a distance InS on the optical axis. The driving module can couple with the lenses and cause the lenses to shift, which satisfies the following formula: 0.2≦InS/HOS≦1.1.

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