TWM593560U - Optical image capturing system - Google Patents

Abstract

The invention discloses a six-piece optical lens for capturing image and a six-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; a sixth lens with refractive power; and at least one of the image-side surface and object-side surface of each of the six 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 especially about a miniaturized optical imaging system 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 process 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 four-piece or five-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 system and further improve the quality of imaging has become a very important issue.

The aspect of this creative embodiment is directed to an optical imaging system, which can utilize the combination of the refractive power of six lenses, convex and concave surfaces (the convex or concave surface in this creation refers in principle to the The description of the geometrical changes of the height of the object side or image side of the lens from the optical axis at different heights), which can 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

In this creation, the visible light spectrum can use the wavelength 555nm as the main reference wavelength and the benchmark for measuring the focus shift, and the infrared light spectrum (700nm to 1300nm) can use the wavelength 940nm as the main reference wavelength and the benchmark for measuring the focus shift.

The optical imaging system has an infrared imaging surface. The infrared imaging surface is a specific infrared light imaging plane perpendicular to the optical axis and its central field of view has the maximum defocus modulation conversion contrast transfer rate (MTF) at the first spatial frequency. value.

The maximum 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 sixth lens is expressed by InTL; the fixed aperture of the optical imaging system ( Aperture) The distance between the infrared imaging surface is represented by InS; the distance between the first lens and the second lens of the optical imaging system is represented by IN12 (exemplified); the thickness of the first lens of the optical imaging system on the optical axis is represented by TP1 Show (exemplify).

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

The lens angle related to 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 the entrance and exit pupils The diameter of the entrance pupil of the optical imaging system is represented by HEP; the exit pupil diameter of the sixth lens image side is HXP; the maximum effective radius of any surface of a single lens refers to the maximum angle of view of the system. The light rays at the edge are at the intersection point (Effective Half Diameter; EHD) of the lens surface, and 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 arc length of the lens surface and the surface profile The length of the profile curve of the maximum effective radius of any surface of a single lens refers to the intersection point of the surface of the lens and the optical axis of the associated optical imaging system as the starting point. The starting point follows the surface profile of the lens until the end of its maximum effective radius. The curve arc length between the aforementioned two points is the length of the maximum effective radius profile curve, and is represented by ARS. For example, the length of the contour curve of the maximum effective radius of the object side of the first lens is represented by ARS11, and the length of the contour curve of the maximum effective radius of the image side of the first lens is represented by ARS12. The profile curve length of the maximum effective radius of the object side of the second lens is represented by ARS21, and the profile curve length of the maximum effective radius of the image side of the second lens is represented by ARS22. The length of the contour curve of the maximum effective radius of any surface of the remaining lenses in the optical imaging system can be expressed by analogy.

The length of the contour curve of the 1/2 entrance pupil diameter (HEP) of any surface of a single lens refers to the intersection of the surface of the lens and the optical axis of the associated optical imaging system as the starting point, and the starting point The surface profile of the lens up to 1/2 the diameter of the entrance pupil on the surface from the optical axis Up to the coordinate point of the vertical height, the arc length between the aforementioned two points is 1/2 the length of the contour curve of the entrance pupil diameter (HEP), and is expressed as ARE. For example, the profile curve length of 1/2 entrance pupil diameter (HEP) on the object side of the first lens is represented by ARE11, and the profile curve length of 1/2 entrance pupil diameter (HEP) on the image side of the first lens is represented by ARE12. The profile curve length of the 1/2 entrance pupil diameter (HEP) on the object side of the second lens is represented by ARE21, and the profile curve length of the 1/2 entrance pupil diameter (HEP) on the image side of the second lens is represented by ARE22. The length of the profile curve of 1/2 entrance pupil diameter (HEP) of any surface of the remaining lens in the optical imaging system is expressed by the same way.

Parameters related to the depth of the lens surface. The intersection of the sixth lens object side on the optical axis and the end of the maximum effective radius of the sixth lens object side. The distance between the two points above the horizontal axis is expressed by InRS61 (maximum effective radius Depth); the intersection of the image side of the sixth lens on the optical axis and the end of the maximum effective radius of the image side of the sixth lens, the distance between the two points above the optical axis is expressed by InRS62 (the maximum effective radius depth). The expression of the depth of the maximum effective radius (subsidence amount) of the object side or image side of other lenses is the same as the above.

The critical point C of the parameter related to the lens profile refers to a point on the surface of a particular lens that is tangent to a tangent plane perpendicular to the optical axis except for the intersection with the optical axis. For example, the vertical distance between the critical point C51 on the side of the fifth lens object and the optical axis is HVT51 (exemplified), the vertical distance between the critical point C52 on the image side of the fifth lens and the optical axis is HVT52 (exemplified), and the sixth lens object The vertical distance between the critical point C61 on the side and the optical axis is HVT61 (illustrated), and the vertical distance between the critical point C62 on the image side of the sixth lens and the optical axis is HVT62 (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 sixth lens is IF611, and the amount of depression at this point is SGI611 (example), that is, the intersection of the object side of the sixth lens on the optical axis and the closest optical axis of the object side of the sixth 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 IF611 is HIF611 (example). The reflex point closest to the optical axis on the image side of the sixth lens is IF621, and the amount of depression at this point is SGI621 (example), that is, the intersection of the image side of the sixth lens on the optical axis and the closest optical axis of the image side of the sixth lens The horizontal displacement distance between the inflexion point and the optical axis is parallel. The vertical distance between this point and the optical axis is IF621 (example).

The inflection point of the second lens object side near the optical axis on the sixth lens side is IF612, and the amount of depression at this point is SGI612 (example), which is the intersection point of the sixth lens object side on the optical axis to the second closest to the sixth lens object side 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 of IF612 is HIF612 (illustrated). The inflection point of the second lens on the image side of the sixth lens close to the optical axis is IF622, and the amount of depression at this point is SGI622 (example), that is, the intersection of the image side of the sixth lens on the optical axis and the second closest to the image side of the sixth 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 IF622 is HIF622 (example).

The third inflection point on the object side of the sixth lens close to the optical axis is IF613, and the amount of depression at this point is SGI613 (exemplified), that is, the intersection of the object side of the sixth lens on the optical axis and the third closest to the object side of the sixth 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 IF613 (illustrated). The inflection point of the third approaching optical axis on the image side of the sixth lens is IF623, and the amount of depression at this point is SGI623 (exemplified), that is, the intersection of the image side of the sixth lens on the optical axis and the third approaching of the image side of the sixth lens Reflex point of optical axis The horizontal displacement distance between the parallel to the optical axis, the vertical distance between the point of IF623 and the optical axis is HIF623 (example).

The fourth inflection point on the object side of the sixth lens close to the optical axis is IF614, and the amount of depression at this point is SGI614 (exemplified), that is, the intersection of the object side of the sixth lens on the optical axis and the fourth closest to the object side of the sixth 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 IF614 (illustrated). The fourth inflection point on the image side of the sixth lens close to the optical axis is IF624, and the amount of depression at this point is SGI624 (example), that is, the intersection of the image side of the sixth lens on the optical axis and the fourth closest to the image side of the sixth 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 HIF624 (example).

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.

The optical distortion (Optical Distortion) of a variable optical imaging system related to aberration is expressed by ODT; the TV distortion (TV Distortion) is expressed by TDT, and can further limit the description of the aberration shift between 50% and 100% of the field of view Degree; spherical aberration offset is expressed in DFS; comet aberration offset is expressed in DFC.

The lateral aberration of the aperture edge is expressed as STA (STOP Transverse Aberration). To evaluate the performance of a specific optical imaging system, the tangential fan or sagittal fan can be used to calculate the lateral light of any field of view Aberration, especially the calculation of the longest operating wavelength (eg wavelength 940NM or 960NM) and the shortest operating wavelength (eg wavelength 840NM or 850NM) through the aperture edge of the lateral aberration size as excellent performance Standard. The coordinate direction of the aforementioned meridian plane light fan can be further divided into a positive direction (upper light) and a negative direction (lower light). The longest operating wavelength passes through the lateral aberration of the aperture edge, which is defined as the imaging position of the longest operating wavelength incident on the infrared light imaging surface at a specific field of view through the aperture edge, which is imaged in infrared light with the reference wavelength chief ray (for example, wavelength 940NM) The difference in the distance between the imaging positions of the field of view on the plane, the shortest operating wavelength passes through the lateral aberration of the aperture edge, which is defined as the imaging position of the shortest operating wavelength incident on the infrared imaging surface through the aperture edge in a specific field of view, which The distance between the imaging position of the field of view in the infrared imaging surface of the reference wavelength chief ray on the infrared imaging surface, and the performance of the specific optical imaging system is evaluated as excellent. The shortest and longest operating wavelength can be used to enter the infrared imaging surface through the aperture edge The lateral aberration of the upper 0.7 field of view (that is, 0.7 imaging height HOI) is less than 100 micrometers (μm) as a verification method, and it can even be incident on the infrared imaging surface with the shortest and longest operating wavelength through the aperture edge. The lateral aberrations are all less than 80 microns (μm) as the inspection method.

The optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the infrared imaging surface, and the longest operating wavelength of infrared light of the positive meridian light fan of the optical imaging system passes through the edge of the entrance pupil and is incident on the infrared imaging surface The lateral aberration at 0.7HOI is expressed by PLTA, and the shortest working wavelength of the infrared light of its positive meridian surface fan passes through the edge of the entrance pupil and is incident on the infrared imaging surface. The lateral aberration at 0.7HOI is expressed by PSTA, negative The longest operating wavelength of the infrared light of the meridian plane fan passes through the edge of the entrance pupil and is incident on the infrared light imaging surface. The lateral aberration at 0.7 HOI is expressed by NLTA. The shortest operating wavelength of the infrared light of the negative meridian plane fan passes through the The lateral aberration of the entrance pupil edge and incident on the infrared light imaging surface at 0.7 HOI is represented by NSTA, and the longest operating wavelength of the infrared light of the sagittal fan passes through the entrance pupil edge and is incident on the infrared light imaging surface at 0.7 HOI The lateral aberration is expressed as SLTA, and the sagittal fan The shortest operating wavelength of infrared light passes through the edge of the entrance pupil and is incident on the infrared light imaging surface at 0.7HOI at the lateral aberration expressed by SSTA.

The present invention provides an optical imaging system. The object side or image side of the sixth lens can be provided with a reflex point, which can effectively adjust the angle of each field of view incident on the sixth lens, and correct the optical distortion and TV distortion. In addition, the surface of the sixth 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, a sixth lens, and an infrared light imaging surface in order from the object side to the image side. Each of the first lens to the sixth lens has a refractive power. The focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, the exit pupil diameter of the sixth lens image side is HXP, and the first lens object side to the infrared light imaging surface has a Distance HOS, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the infrared imaging surface, half of the maximum viewing angle of the optical imaging system is HAF, any surface of any of the lenses The intersection point of the optical axis is the starting point, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2HXP from the optical axis, the length of the contour curve between the two points is ARE, which satisfies the following conditions: 0.5≦ f/HEP≦1.8; 0deg<HAF≦50deg and 0.9≦2(ARE/HEP)≦2.0.

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, a sixth 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 lens from the first lens to the sixth lens has at least one inflection point. The focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, the exit pupil diameter of the image side of the sixth lens is HXP, and the first lens There is a distance HOS from the side of the object to the infrared imaging surface on the optical axis. Half of the maximum viewing angle of the optical imaging system is HAF. The intersection of any surface of any of these lenses with the optical axis is the starting point, along The contour of the surface is up to the coordinate point on the surface at a vertical height of 1/2HXP from the optical axis. The length of the contour curve between the two points is ARE, which meets the following conditions: 0.5≦f/HEP≦1.5; 0deg< HAF≦50deg and 0.9≦2(ARE/HEP)≦2.0.

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, a sixth lens, and an infrared imaging surface in order from the object side to the image side. There are six lenses with refractive power in the optical imaging system, and at least one surface of at least one lens of at least two lenses from the first lens to the sixth lens has at least one inflection point. The optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the infrared imaging surface. Half of the maximum viewing angle of the optical imaging system is HAF, the exit pupil diameter of the image side of the sixth lens is HXP, and the intersection of any surface of any of these lenses with the optical axis is the starting point, along the contour of the surface Until the coordinate point on the surface at a vertical height of 1/2HXP from the optical axis, the length of the contour curve between the two points is ARE, which meets the following conditions: 0.5≦f/HEP≦1.3; 10deg≦HAF≦50deg; 0.9 ≦2(ARE/HEP)≦2.0.

The length of the contour curve of any surface of a single lens within the maximum effective radius affects the ability of the surface to correct aberrations and optical path differences between light rays of various fields. The longer the length of the contour curve, the better the ability to correct aberrations, but at the same time It will increase the difficulty of manufacturing, so it is necessary to control the length of the contour curve of any surface of a single lens within the maximum effective radius, especially the length of the contour curve (ARS) and the surface within the maximum effective radius of the surface The ratio between the thickness (TP) of the lens on the optical axis (ARS/TP). For example The length of the profile curve of the maximum effective radius of the side of a lens is represented by ARS11, the thickness of the first lens on the optical axis is TP1, the ratio between the two is ARS11/TP1, the profile curve of the maximum effective radius of the image side of the first lens The length is expressed in ARS12, and the ratio between it and TP1 is ARS12/TP1. The length of the profile curve of the maximum effective radius of the object side of the second lens is represented by ARS21, the thickness of the second lens on the optical axis is TP2, the ratio between the two is ARS21/TP2, and the profile of the maximum effective radius of the image side of the second lens The length of the curve is represented by ARS22, and the ratio between it and TP2 is ARS22/TP2. The proportional relationship between the length of the contour curve of the maximum effective radius of any surface of the remaining lenses in the optical imaging system and the thickness of the lens on the optical axis (TP) to which the surface belongs, and its representation is the same.

The length of the contour curve of any surface of a single lens in the height range of 1/2 entrance pupil diameter (HEP) particularly affects the ability of the surface to correct the aberration in the common area of the light field and the optical path difference between the light rays of each field The longer the contour curve length is, the better the ability to correct aberrations, but at the same time it will increase the difficulty of manufacturing. Therefore, it is necessary to control the contour of any surface of a single lens within the height of 1/2 entrance pupil diameter (HEP) Curve length, especially the proportional relationship between the length of the profile curve (ARE) in the height range of 1/2 the entrance pupil diameter (HEP) of the surface and the thickness (TP) of the lens on the optical axis to which the surface belongs (ARE) /TP). For example, the length of the profile curve of the 1/2 entrance pupil diameter (HEP) height of the object side of the first lens is represented by ARE11, the thickness of the first lens on the optical axis is TP1, the ratio between the two is ARE11/TP1, the first transparent The length of the profile curve of the height of 1/2 entrance pupil diameter (HEP) on the side of the mirror image is represented by ARE12, and the ratio between it and TP1 is ARE12/TP1. The length of the profile curve of the 1/2 entrance pupil diameter (HEP) height of the object side of the second lens is represented by ARE21, the thickness of the second lens on the optical axis is TP2, and the ratio between the two is ARE21/TP2. 1/2 entrance pupil diameter on the side (HEP) The length of the height profile curve is expressed as ARE22, and the ratio between it and TP2 is ARE22/TP2. The ratio between the length of the contour curve of the height of 1/2 the entrance pupil diameter (HEP) of any surface of the other lenses in the optical imaging system and the thickness (TP) of the lens on the optical axis to which the surface belongs. And so on.

When |f1|>|f6|, the total height of the optical imaging system (HOS; Height of Optic System) can be shortened appropriately to achieve the purpose of miniaturization.

When |f2|+|f3|+|f4|+|f5|>|f1|+|f6| meets the above conditions, at least one of the second lens to the fifth lens has a weak positive refractive power or weak Negative refractive power. The so-called weak refractive power refers to the absolute value of the focal length of a particular lens is greater than 10mm. When at least one of the second lens to the fifth lens has a weak positive refractive power, it can effectively share the positive refractive power of the first lens and prevent unnecessary aberration from appearing prematurely, otherwise, if the second lens to the fifth lens At least one of the five lenses has a weak negative refractive power, and the aberration of the correction system can be fine-tuned.

In addition, the sixth 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 sixth 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.

10, 20, 30, 40, 50, 60 ‧‧‧ optical imaging system

100, 200, 300, 400, 500, 600 ‧ ‧ aperture

110,210,310,410,510,610‧‧‧first lens

112,212,312,412,512,612

114,214,314,414,514,614

120,220,320,420,520,620‧‧‧second lens

122,222,322,422,522,622

124,224,324,424,524,624

130,230,330,430,530,630‧‧‧third lens

132,232,332,432,532,632

134,234,334,434,534,634

140, 240, 340, 440, 540, 640‧‧‧ fourth lens

142,242,342,442,542,642

144,244,344,444,544,644

150,250,350,450,550,650 ‧‧‧ fifth lens

152,252,352,452,552,652

154,254,354,454,554,654

160,260,360,460,560,660 ‧‧‧ sixth lens

162,262,362,462,562,662

164,264,364,464,564,664

180,280,380,480,580,680 ‧‧‧ infrared filter

190,290,390,490,590,690 ‧‧‧ infrared imaging surface

192,292,392,492,592,692‧‧‧‧sensor

f‧‧‧ Focal length of optical imaging system

f1, f2, f3, f4, f5, f6 ‧‧‧ focal length from the first lens to the sixth lens

f/HEP,Fno,F#‧‧‧Aperture value of optical imaging system

HAF‧‧‧Half the maximum angle of view of the optical imaging system

NA1, NA2, NA3, NA4, NA5, NA6 The dispersion coefficients of the first lens to the sixth lens

R1, R2‧‧‧The curvature radius of the object side and image side of the first lens

R3, R4‧‧‧The curvature radius of the object side and image side of the second lens

R5, R6‧‧‧The curvature radius of the third lens object side and image side

R7, R8‧‧‧The curvature radius of the fourth lens object side and image side

R9, R10‧‧‧The curvature radius of the fifth lens object side and image side

R11, R12‧‧‧ The curvature radius of the sixth lens object side and image side

TP1, TP2, TP3, TP4, TP5, TP6 The thickness of the first lens to the sixth lens on the optical axis

ΣTP‧‧‧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

IN56‧‧‧The distance between the fifth lens and the sixth lens on the optical axis

InRS61‧‧‧The horizontal displacement distance between the intersection point of the sixth lens object side on the optical axis and the maximum effective radius position of the sixth lens object side on the optical axis

IF611 The inflexion point closest to the optical axis on the side of the sixth lens object

SGI611‧‧‧Subsidence

HIF611 The vertical distance between the reflex point closest to the optical axis and the optical axis on the side of the sixth lens object

IF621 The inflexion point closest to the optical axis on the image side of the sixth lens

SGI621‧‧‧Subsidence

HIF621 The vertical distance between the reflex point closest to the optical axis on the image side of the sixth lens and the optical axis

IF612‧‧‧The second lens reflex point close to the optical axis on the side of the sixth lens

SGI612‧‧‧Subsidence

HIF612‧‧‧The vertical distance between the second reflex point close to the optical axis and the optical axis

IF622 The second lens on the side of the sixth lens image side, which is the closest to the optical axis

SGI622‧‧‧Subsidence

HIF622 The vertical distance between the reflex point of the sixth lens image side near the optical axis and the optical axis

C61 The critical point on the side of the sixth lens object

C62 The critical point on the side of the sixth lens image

The horizontal displacement distance between the critical point on the side of the sixth lens object and the optical axis

SGC62 The horizontal displacement distance between the critical point of the sixth lens image side and the optical axis

The vertical distance between the critical point of the side surface of the sixth lens object and the optical axis

HVT62 The vertical distance between the critical point of the sixth lens image side 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)

Dg‧‧‧Diagonal length of image sensing element

InS‧‧‧ distance from aperture to infrared imaging surface

InTL‧‧‧ distance from the object side of the first lens to the image side of the sixth lens

InB‧‧‧The distance from the side of the sixth lens image to the infrared imaging surface

HOI‧‧‧The image sensing element effectively senses half the diagonal length of the area (maximum image height)

TV Distortion of TDT‧‧‧ Optical imaging system

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;

Figure 1C is a lateral aberration diagram of the meridional plane fan and sagittal plane fan of the optical imaging system according to the first embodiment of the present invention, the longest operating wavelength and the shortest operating wavelength passing through the edge of the aperture at 0.7 field of view;

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;

Figure 2C is a lateral aberration diagram of the meridional plane fan and sagittal plane fan of the optical imaging system according to the second embodiment of the present invention, the longest operating wavelength and the shortest operating wavelength passing through the edge of the aperture at the 0.7 field of view;

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;

Figure 3C is a lateral aberration diagram of the meridional plane fan and sagittal plane fan of the optical imaging system according to the third embodiment of the present invention, the longest operating wavelength and the shortest operating wavelength passing through the edge of the aperture at the 0.7 field of view;

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 lateral aberration diagram of the meridional plane fan and sagittal plane fan of the optical imaging system according to the fourth embodiment of the present invention, the longest operating wavelength and the shortest operating wavelength passing through the edge of the aperture at 0.7 field of view;

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 lateral aberration diagram of the meridional plane fan and sagittal plane fan of the optical imaging system according to the fifth embodiment of the present invention, the longest operating wavelength and the shortest operating wavelength passing through the edge of the aperture at 0.7 field of view;

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 lateral aberration diagram of the meridional plane fan and the sagittal plane fan of the optical imaging system according to the sixth embodiment of the present invention. The longest operating wavelength and the shortest operating wavelength pass through the edge of the aperture at 0.7 field of view.

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and an infrared light imaging surface in order from the object side to the image side. 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 850nm, 940nm, and 960nm, of which 960nm is the main reference wavelength and the main reference wavelength for extracting technical features.

The optical imaging system can be designed using three visible light working wavelengths, namely 486.1nm, 587.5nm, and 656.2nm, of which 587.5nm is the main reference wavelength and the main reference wavelength for extracting technical features. The optical imaging system can also be set using five operating wavelengths They are respectively 470nm, 510nm, 555nm, 610nm, and 650nm, of which 555nm is the main reference wavelength and is the reference wavelength that mainly extracts the technical characteristics of visible light.

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≦Σ PPR/｜Σ NPR｜≦15, Preferably, the following condition can be satisfied: 1≦Σ PPR/|Σ NPR|≦3.0.

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≦50; and 0.5≦HOS/f≦150. Preferably, the following conditions can be satisfied: 0.5≦HOS/HOI≦6; and 1≦HOS/f≦140. 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 helps Expanding the angle of view of the system, so that the optical imaging system has the advantages 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 sixth 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≦Σ TP /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 surface of the first lens is R1, and the radius of curvature of the image side surface of the first lens is R2, which satisfies the following condition: 0.001≦|R1/R2|≦25. 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 condition can be satisfied: 0.01≦|R1/R2|<12.

The radius of curvature of the object side of the sixth lens is R11, and the radius of curvature of the image side of the sixth lens is R12, which satisfies the following conditions: -7<(R11-R12)/(R11+R12)<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≦60. This helps to improve the chromatic aberration of the lens to improve its performance.

The separation distance between the fifth lens and the sixth lens on the optical axis is IN56, which satisfies the following condition: IN56/f≦3.0, which 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≦10. In this way, it helps to control the sensitivity of optical imaging system manufacturing and improve its performance.

The thicknesses of the fifth lens and the sixth lens on the optical axis are TP5 and TP6, respectively. The separation distance between the two lenses on the optical axis is IN56, which satisfies the following conditions: 0.1≦(TP6+IN56)/TP5≦15. 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 fourth lens on the optical axis is TP4, 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 : 0.1≦TP4/(IN34+TP4+IN45)<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 C61 on the side of the sixth lens object and the optical axis is HVT61, and the vertical distance between the critical point C62 on the image side of the sixth lens and the optical axis is HVT62, The horizontal displacement distance from the intersection point on the optical axis to the critical point C61 at the optical axis is SGC61, and the horizontal displacement distance from the intersection point on the optical axis of the sixth lens image side to the critical point C62 at the optical axis is SGC62, which can satisfy the following conditions : 0mm≦HVT61≦3mm; 0mm<HVT62≦6mm; 0≦HVT61/HVT62; 0mm≦|SGC61|≦0.5mm; 0mm<|SGC62|≦2mm; and 0<|SGC62|/(|SGC62｜+TP6) ≦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≦HVT62/HOI≦0.9. Preferably, the following condition can be satisfied: 0.3≦HVT62/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≦HVT62/HOS≦0.5. Preferably, the following condition can be satisfied: 0.2≦HVT62/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 sixth lens object side on the optical axis and the inflection point of the closest optical axis of the sixth lens object side parallel to the optical axis is represented by SGI611, and the sixth lens image The horizontal displacement distance between the intersection of the side on the optical axis and the reflex point of the closest optical axis of the sixth lens image side parallel to the optical axis is represented by SGI621, which satisfies the following conditions: 0<SGI611/(SGI611+TP6)≦0.9 ; 0<SGI621/(SGI621+TP6)≦0.9. Preferably, the following conditions can be satisfied: 0.1≦SGI611/(SGI611+TP6)≦0.6; 0.1≦SGI621/(SGI621+TP6)≦0.6.

The horizontal displacement distance between the intersection point of the sixth lens object side on the optical axis and the second lens object side reflexion point close to the optical axis parallel to the optical axis is represented by SGI612, and the sixth lens image side on the optical axis The horizontal displacement distance between the intersection point and the reflex point near the optical axis of the sixth lens image side parallel to the optical axis is expressed by SGI622, which satisfies the following conditions: 0<SGI612/(SGI612+TP6)≦0.9; 0<SGI622 /(SGI622+TP6)≦0.9. Preferably, the following conditions can be satisfied: 0.1≦SGI612/(SGI612+TP6)≦0.6; 0.1≦SGI622/(SGI622+TP6)≦0.6.

The vertical distance between the reflex point of the closest optical axis of the sixth lens object side and the optical axis is represented by HIF611, the intersection point of the sixth lens image side on the optical axis to the reflex point and optical axis of the closest optical axis of the sixth lens image side The vertical distance between them is expressed by HIF621, which satisfies the following conditions: 0.001mm≦|HIF611|≦5mm; 0.001mm≦|HIF621|≦5mm. Preferably, the following conditions can be satisfied: 0.1mm≦|HIF611|≦3.5mm; 1.5mm≦|HIF621|≦3.5mm.

The vertical distance between the second reflex point near the optical axis of the sixth lens object side and the optical axis is represented by HIF612. The intersection point of the sixth lens image side on the optical axis to the sixth lens image side The vertical distance between the reflex point near the optical axis and the optical axis is represented by HIF622, which satisfies the following conditions: 0.001mm≦|HIF612|≦5mm; 0.001mm≦|HIF622|≦5mm. Preferably, the following conditions can be satisfied: 0.1mm≦|HIF622|≦3.5mm; 0.1mm≦|HIF612|≦3.5mm.

The vertical distance between the third reflex point near the optical axis of the sixth lens object side and the optical axis is expressed by HIF613, and the intersection point of the sixth lens image side on the optical axis to the third lens side recurve of the sixth lens image side The vertical distance between the point and the optical axis is expressed by HIF623, which satisfies the following conditions: 0.001mm≦|HIF613|≦5mm; 0.001mm≦|HIF623|≦5mm. Preferably, the following conditions can be satisfied: 0.1mm≦|HIF623|≦3.5mm; 0.1mm≦|HIF613|≦3.5mm.

The vertical distance between the fourth reflex point near the optical axis of the sixth lens object side and the optical axis is expressed by HIF614, and the intersection point of the sixth lens image side on the optical axis to the fourth lens side image side recurve The vertical distance between the point and the optical axis is represented by HIF624, which satisfies the following conditions: 0.001mm≦|HIF614|≦5mm; 0.001mm≦|HIF624|≦5mm. Preferably, the following conditions can be satisfied: 0.1mm≦|HIF624|≦3.5mm; 0.1mm≦|HIF614|≦3.5mm.

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 sixth 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, the fifth lens, and the sixth lens at least one lens with a wavelength less than that according to the demand. The 500 nm light filtering element can be achieved by coating at least one surface of the specific lens with a filtering function or the lens itself is made of a material with a short wavelength that can be filtered.

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 stereoscopic images 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 FIG. 1A, FIG. 1B and FIG. 1C, wherein FIG. 1A shows a schematic diagram of an optical imaging system according to the first embodiment of the present invention, and FIG. 1B is from left to right in order for the first embodiment. Graph of spherical aberration, astigmatism and optical distortion of optical imaging system. FIG. 1C is a lateral aberration diagram of the meridional plane fan and the sagittal plane fan of the optical imaging system of the first embodiment, with the longest operating wavelength and the shortest operating wavelength passing through the aperture edge at the 0.7 field of view. As can be seen from FIG. 1A, the optical imaging system 10 includes a first lens 110, an aperture 100, and an The second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, the infrared filter 180, the infrared imaging surface 190, and the image sensing element 192.

The first lens 110 has a negative refractive power and is made of plastic material. Its object side 112 is concave, and its image side 114 is concave, all of which are aspherical, and its object side 112 has two inflexions. The profile curve length of the maximum effective radius of the object side of the first lens is represented by ARS11, and the profile curve length of the maximum effective radius of the image side of the first lens is represented by ARS12. The profile curve length of the 1/2 entrance pupil diameter (HEP) on the object side of the first lens is represented by ARE11, and the profile curve length of the 1/2 entrance pupil diameter (HEP) on the image side of the first lens is represented by ARE12. The thickness of the first lens on the optical axis is TP1.

The horizontal displacement distance between the intersection point of the first lens object side on the optical axis and the reflex point of the closest optical axis of the first lens object side parallel to the optical axis is represented by SGI111, and the intersection point of the first lens image side on the optical axis to The horizontal displacement 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 SGI121, which satisfies the following conditions: SGI111=-0.0031mm; |SGI111|/(|SGI111|+TP1)=0.0016 .

The horizontal displacement distance between the intersection point of the first 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 SGI112. The image side of the first lens on the optical axis The horizontal displacement distance between the intersection point and the reflex point near the optical axis of the first lens image side parallel to the optical axis is represented by SGI122, which satisfies the following conditions: SGI112=1.3178mm; |SGI112|/(|SGI112｜+TP1 )=0.4052.

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 intersection point of the image side of the first lens on the optical axis to the closest light of the image side of the first lens The vertical distance between the reflex point of the axis and the optical axis is represented by HIF121, which satisfies the following conditions: HIF111=0.5557mm; HIF111/HOI=0.1111.

The vertical distance between the second reflex point near the optical axis of the object side of the first lens and the optical axis is represented by HIF112, and the intersection point of the image side of the first lens on the optical axis to the second recurve near the optical axis of the image side of the first lens The vertical distance between the point and the optical axis is represented by HIF122, which satisfies the following conditions: HIF112=5.3732mm; HIF112/HOI=1.0746.

The second lens 120 has positive refractive power and is made of plastic material. Its object side 122 is convex, its image side 124 is convex, and both are aspherical, and its object side 122 has an inflexion point. The profile curve length of the maximum effective radius of the object side of the second lens is represented by ARS21, and the profile curve length of the maximum effective radius of the image side of the second lens is represented by ARS22. The profile curve length of the 1/2 entrance pupil diameter (HEP) on the object side of the second lens is represented by ARE21, and the profile curve length of the 1/2 entrance pupil diameter (HEP) on the image side of the second lens is represented by ARE22. The thickness of the second lens on the optical axis is TP2.

The horizontal displacement distance between the intersection point 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 intersection point of the second lens image side on the optical axis to The horizontal displacement distance between the inflection point of the closest optical axis of the second lens image side and the optical axis is expressed by SGI221, which satisfies the following conditions: SGI211=0.1069mm; |SGI211|/(|SGI211|+TP2)=0.0412; SGI221=0mm; |SGI221|/(|SGI221|+TP2)=0.

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, the intersection point of the image side of the second lens on the optical axis to the reflex point and optical axis of the closest optical axis of the image side of the second lens The vertical distance between them is expressed by HIF221, which meets the following conditions: HIF211=1.1264mm; HIF211/HOI=0.2253; HIF221=0mm; HIF221/HOI=0.

The third lens 130 has negative refractive power and is made of plastic material. Its object side 132 is concave, its image side 134 is convex, and both are aspherical, and its object side 132 and image side 134 both have an inflection point. The profile curve length of the maximum effective radius of the third lens object side is represented by ARS31, and the profile curve length of the maximum effective radius of the third lens image side is represented by ARS32. The profile curve length of the 1/2 entrance pupil diameter (HEP) on the object side of the third lens is represented by ARE31, and the profile curve length of the 1/2 entrance pupil diameter (HEP) on the image side of the third lens is represented by ARE32. The thickness of the third lens on the optical axis is TP3.

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 point of the closest optical axis of the third lens image side and the optical axis is expressed by SGI321, which satisfies the following conditions: SGI311=-0.3041mm; |SGI311|/(|SGI311|+TP3)=0.4445 ; SGI321=-0.1172mm; |SGI321|/(|SGI321|+TP3)=0.2357.

The vertical distance between the reflex point of the closest optical axis of the object side of the third lens and the optical axis is represented by HIF311, and the intersection point of the image side of the third lens on the optical axis to the reflex point and optical axis of the closest optical axis of the third lens image side The vertical distance between them is expressed by HIF321, which meets the following conditions: HIF311=1.5907mm; HIF311/HOI=0.3181; HIF321=1.3380mm; HIF321/HOI=0.2676.

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 concave, and both are aspherical, and its object side 142 has a double reflection The curve point and the image side 144 have an inverse curve point. The length of the contour curve of the maximum effective radius of the fourth lens object side is represented by ARS41, and the length of the contour curve of the maximum effective radius of the fourth lens image side is represented by ARS42. The profile curve length of the 1/2 entrance pupil diameter (HEP) on the object side of the fourth lens is represented by ARE41, and the profile curve length of the 1/2 entrance pupil diameter (HEP) on the image side of the fourth lens is represented by ARE42. The thickness of the fourth lens on the optical axis is TP4.

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 represented by SGI421, which satisfies the following conditions: SGI411=0.0070mm; |SGI411|/(|SGI411|+TP4)=0.0056; SGI421=0.0006mm; |SGI421|/(|SGI421|+TP4)=0.0005.

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 between the intersection point and the second lens-side reflex point near the optical axis of the fourth lens parallel to the optical axis is represented by SGI422, which satisfies the following conditions: SGI412=-0.2078mm; |SGI412|/(|SGI412|+ TP4)=0.1439.

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, the intersection point of the fourth lens image side on the optical axis to the reflex point and optical axis of the closest optical axis of the fourth lens image side The vertical distance between them is represented by HIF421, which meets the following conditions: HIF411=0.4706mm; HIF411/HOI=0.0941; HIF421=0.1721mm; HIF421/HOI=0.0344.

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 intersection point of the fourth lens image side on the optical axis to the second lens side reflex of the fourth lens image side The vertical distance between the point and the optical axis is represented by HIF422, which satisfies the following conditions: HIF412=2.0421mm; HIF412/HOI=0.4084.

The fifth lens 150 has a positive refractive power and is made of plastic material. Its object side 152 is convex, its image side 154 is convex, and both are aspherical, and its object side 152 has two inflexions and the image side 154 has a Recurve point. The profile curve length of the maximum effective radius of the fifth lens object side is represented by ARS51, and the profile curve length of the maximum effective radius of the fifth lens image side is represented by ARS52. The profile curve length of the 1/2 entrance pupil diameter (HEP) on the object side of the fifth lens is represented by ARE51, and the profile curve length of the 1/2 entrance pupil diameter (HEP) on the image side of the fifth lens is represented by ARE52. The thickness of the fifth lens on the optical axis is TP5.

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 points 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=0.00364mm; |SGI511|/(|SGI511|+TP5)=0.00338; SGI521=-0.63365mm; |SGI521|/(|SGI521|+TP5)=0.37154.

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: SGI512=-0.32032mm; |SGI512|/(|SGI512|+ TP5)=0.23009.

The horizontal displacement distance between the intersection point of the fifth lens object side on the optical axis and the third lens object side's inflection point close to the optical axis is parallel to the optical axis, and is represented by SGI513. The fifth lens image side on the optical axis The horizontal displacement distance parallel to the optical axis from the intersection point to the third lens-side reflex point near the optical axis of the fifth lens is expressed as SGI523, which satisfies the following conditions: SGI513=0mm; |SGI513|/(|SGI513|+TP5) =0; SGI523=0 mm; |SGI523|/(|SGI523|+TP5)=0.

The horizontal displacement distance between the intersection of the fifth lens object side on the optical axis and the fourth inflection point close to the optical axis of the fifth lens object side parallel to the optical axis is represented by SGI514. The image side of the fifth lens on the optical axis The horizontal displacement distance from the intersection point to the fourth reflex point near the optical axis of the fifth lens image side parallel to the optical axis is represented by SGI524, which satisfies the following conditions: SGI514=0mm; |SGI514|/(|SGI514｜+TP5) =0; SGI524=0 mm; |SGI524|/(|SGI524|+TP5)=0.

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=0.28212mm; HIF511/HOI=0.05642; HIF521=2.13850mm; HIF521/HOI=0.42770.

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, It meets the following conditions: HIF512=2.51384mm; HIF512/HOI=0.50277.

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 vertical reflex point between the third near optical axis of the fifth lens side and the optical axis The straight distance is represented by HIF523, which satisfies the following conditions: HIF513=0mm; HIF513/HOI=0; HIF523=0mm; HIF523/HOI=0.

The vertical distance between the fourth reflex point near the optical axis of the fifth lens side and the optical axis is represented by HIF514, and the vertical distance between the fourth reflex point near the optical axis of the fifth lens side and the optical axis is represented by HIF524, It meets the following conditions: HIF514=0mm; HIF514/HOI=0; HIF524=0mm; HIF524/HOI=0.

The sixth lens 160 has negative refractive power and is made of plastic material. Its object side 162 is concave, its image side 164 is concave, and its object side 162 has two inflexions and the image side 164 has an inversion. In this way, the angle at which each field of view is incident on the sixth lens can be effectively adjusted to improve aberrations. The profile curve length of the maximum effective radius of the sixth lens object side is represented by ARS61, and the profile curve length of the maximum effective radius of the sixth lens image side is represented by ARS62. The profile curve length of the 1/2 entrance pupil diameter (HEP) on the object side of the sixth lens is represented by ARE61, and the profile curve length of the 1/2 entrance pupil diameter (HEP) on the image side of the sixth lens is represented by ARE62. The thickness of the sixth lens on the optical axis is TP6.

The horizontal displacement distance between the intersection point of the sixth lens object side on the optical axis and the reflex point of the closest optical axis of the sixth lens object side parallel to the optical axis is represented by SGI611, and the intersection point of the sixth lens image side on the optical axis to The horizontal displacement distance between the reflex point of the closest optical axis of the sixth lens image side and the optical axis is represented by SGI621, which satisfies the following conditions: SGI611=-0.38558mm; |SGI611|/(|SGI611|+TP6)=0.27212 ; SGI621=0.12386mm; |SGI621|/(|SGI621|+TP6)=0.10722.

The horizontal displacement distance between the intersection point of the sixth lens object side on the optical axis and the second lens object side surface near the optical axis, which is parallel to the optical axis, is represented by SGI612. The horizontal displacement distance between the intersection point of the mirror image side on the optical axis and the reflex point near the optical axis of the sixth lens image side parallel to the optical axis is expressed as SGI621, which satisfies the following conditions: SGI612=-0.47400mm; | SGI612 |/(|SGI612|+TP6)=0.31488; SGI622=0mm;|SGI622|/(|SGI622|+TP6)=0.

The vertical distance between the reflex point of the closest optical axis of the sixth lens object side and the optical axis is represented by HIF611, and the vertical distance between the reflex point of the closest optical axis of the sixth lens image side and the optical axis is represented by HIF621, which satisfies the following conditions : HIF611=2.24283mm; HIF611/HOI=0.44857; HIF621=1.07376mm; HIF621/HOI=0.21475.

The vertical distance between the second reflex point near the optical axis of the sixth lens object side and the optical axis is represented by HIF612, and the vertical distance between the second reflex point near the optical axis of the sixth lens image side and the optical axis is represented by HIF622, It meets the following conditions: HIF612=2.48895mm; HIF612/HOI=0.49779.

The vertical distance between the third reflex point near the optical axis of the sixth lens object side and the optical axis is represented by HIF613, and the vertical distance between the third reflex point near the optical axis of the sixth lens image side and the optical axis is represented by HIF623, It meets the following conditions: HIF613=0mm; HIF613/HOI=0; HIF623=0mm; HIF623/HOI=0.

The vertical distance between the fourth reflex point near the optical axis of the sixth lens side and the optical axis is represented by HIF614, and the vertical distance between the fourth reflex point near the optical axis of the sixth lens side and the optical axis is represented by HIF624, It meets the following conditions: HIF614=0mm; HIF614/HOI=0; HIF624=0mm; HIF624/HOI=0.

The infrared filter 180 is made of glass, which is disposed between the sixth lens 160 and the infrared imaging surface 190 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 viewing angle in the optical imaging system is HAF. The values are as follows: f=4.075mm; f/HEP =1.4; and HAF=50.000 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 sixth lens 160 is f6, which satisfies the following conditions: f1=-7.828mm; |f/f1|=0.52060; f6=-4.886 ; And |f1|>|f6|.

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|+|f5| =95.50815mm; |f1|+|f6|=12.71352mm and |f2|+|f3|+|f4|+|f5|>|f1|+|f6|.

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 lenses with positive refractive power is ΣPPR=f/f2+f/f4+f/f5=1.63290, and the total NPR of all lenses with negative refractive power is ΣNPR=｜f/f1｜+｜f/ f3|+|f/f6|=1.51305, Σ PPR/|Σ NPR|=1.07921. At the same time, the following conditions are also satisfied: |f/f2|=0.69101;|f/f3|=0.15834;|f/f4|=0.06883;|f/f5|=0.87305;|f/f6|=0.83412.

In the optical imaging system of this embodiment, the distance between the first lens object side 112 to the sixth lens image side 164 is InTL, the distance between the first lens object side 112 to the infrared light imaging surface 190 is HOS, and the aperture 100 to infrared The distance between the optical imaging planes 190 is InS, the half of the diagonal length of the effective sensing area of the image sensing element 192 is HOI, and the image side of the sixth lens 164 to red The distance between the external light imaging surfaces 190 is BFL, which satisfies the following conditions: InTL+BFL=HOS; HOS=19.54120mm; HOI=5.0mm; HOS/HOI=3.90824; HOS/f=4.7952; InS=11.685mm; and InS/HOS=0.59794.

In the optical imaging system of this embodiment, the total thickness of all lenses with refractive power on the optical axis is Σ TP, which satisfies the following conditions: Σ TP=8.13899 mm; and Σ TP/InTL=0.52477. 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|=8.99987. 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 radius of curvature of the sixth lens object side 162 is R11, and the radius of curvature of the sixth lens image side 164 is R12, which satisfies the following conditions: (R11-R12)/(R11+R12)= 1.27780. 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 the focal lengths of all lenses with positive refractive power is Σ PP, which satisfies the following conditions: Σ PP=f2+f4+f5=69.770mm; and f5/(f2+f4+f5) =0.067. In this way, it helps to properly distribute the positive refractive power of a single lens to other positive lenses, so as to suppress the generation of significant aberrations in the process of incident light.

In the optical imaging system of this embodiment, the sum of focal lengths of all lenses with negative refractive power is Σ NP, which satisfies the following conditions: Σ NP=f1+f3+f6=-38.451mm; and f6/(f1+f3+f6)=0.127. In this way, it is helpful to appropriately distribute the negative refractive power of the sixth lens to other negative lenses, so as to suppress the generation of significant aberrations in the course 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=6.418mm; IN12/f=1.57491. 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 fifth lens 150 and the sixth lens 160 on the optical axis is IN56, which satisfies the following conditions: IN56=0.025mm; IN56/f=0.00613. This helps to improve the chromatic aberration of the lens to improve its performance.

In the optical imaging system of this embodiment, the thicknesses of the first lens 110 and the second lens 120 on the optical axis are TP1 and TP2, respectively, which satisfy the following conditions: TP1=1.934mm; TP2=2.486mm; and (TP1+IN12 )/TP2=3.36005. 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 fifth lens 150 and the sixth lens 160 on the optical axis are TP5 and TP6, respectively, and the separation distance between the two lenses on the optical axis is IN56, which satisfies the following conditions: TP5= 1.072mm; TP6=1.031mm; and (TP6+IN56)/TP5=0.98555. 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 separation distance between the third lens 130 and the fourth lens 140 on the optical axis is IN34, and the separation distance between the fourth lens 140 and the fifth lens 150 on the optical axis is IN45, which satisfies the following Conditions: IN34=0.401mm; IN45=0.025mm; and TP4/(IN34+TP4+IN45)=0.74376. In this way, it helps to slightly correct the aberrations generated 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 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=-0.34789mm ; InRS52=-0.88185mm; | InRS51|/TP5=0.32458 and |InRS52|/TP5=0.82276. 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 152 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=0.515349mm; HVT52=0mm.

In the optical imaging system of this embodiment, the horizontal displacement distance from the intersection of the sixth lens object side 162 on the optical axis to the maximum effective radius position of the sixth lens object side 162 on the optical axis is InRS61, and the sixth lens image side 164 is The horizontal displacement distance from the intersection point on the optical axis to the maximum effective radius of the image side 164 of the sixth lens on the optical axis is InRS62, and the thickness of the sixth lens 160 on the optical axis is TP6, which satisfies the following conditions: InRS61=-0.58390mm ; InRS62=0.41976mm; | InRS61|/TP6=0.56616 and |InRS62|/TP6=0.40700. 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 sixth lens object side 162 and the optical axis is HVT61, and the vertical distance between the critical point of the sixth lens image side 164 and the optical axis is HVT62, which satisfies the following conditions: HVT61=0mm; HVT62=0mm.

In the optical imaging system of this embodiment, it satisfies the following condition: HVT51/HOI=0.1031. 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 condition: HVT51/HOS=0.02634. 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 second lens, the third lens, and the sixth lens have negative refractive power, the second lens has a dispersion coefficient of NA2, the third lens has a dispersion coefficient of NA3, and the sixth lens has a dispersion coefficient of NA6, which satisfies the following conditions: NA6/NA2≦1. 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=2.124%; ODT=5.076%.

In the optical imaging system of this embodiment, the longest visible wavelength of the visible meridian plane fan pattern is incident on the infrared imaging plane through the aperture edge. The lateral aberration of the 0.7 field of view is represented by PLTA, which is 0.006mm, positive meridian The shortest working wavelength of the visible light of the surface fan diagram is incident on the infrared imaging surface through the aperture edge. The lateral aberration of 0.7 field of view is represented by PSTA, which is 0.005mm. The longest working wavelength of the visible light of the negative meridian surface fan diagram passes through the edge of the aperture The lateral aberration of the 0.7 field of view incident on the infrared imaging surface is expressed in NLTA, which is 0.004mm, and the shortest working wavelength of the visible meridional light fan pattern is the horizontal wavelength of 0.7 field of view incident on the infrared imaging surface through the aperture edge The aberration is expressed in NSTA, which is -0.007mm. The longest working wavelength of visible light of the sagittal plane fan pattern is incident on the infrared imaging surface through the edge of the aperture in the horizontal direction of 0.7 field of view The aberration is expressed by SLTA, which is -0.003mm, and the shortest operating wavelength of the visible light of the sagittal fan pattern is incident on the infrared imaging surface through the aperture edge. The lateral aberration of 0.7 field of view is expressed by SSTA, which is 0.008mm.

Refer to Table 1 and Table 2 below.

Table 2. Aspheric coefficients of the first embodiment

According to Table 1 and Table 2, the following values related to the length of the profile curve can be obtained:

Table 1 is the detailed structural data of the first embodiment, 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 FIGS. 2A, 2B, and 2C, where 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 second embodiment. Graph of spherical aberration, astigmatism and optical distortion of optical imaging system. FIG. 2C is a lateral aberration diagram of the optical imaging system of the second embodiment at a field of view of 0.7. As can be seen from FIG. 2A, the optical imaging system 20 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 a sixth lens in order from the object side to the image side 260, an infrared filter 280, an infrared imaging surface 290, and an image sensing element 292.

The first lens 210 has a 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 its object side 212 has an inflexion point and the image side 214 has two Recurve point.

The second lens 220 has negative 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 232 has an inflexion point and the image side 224 has two Recurve point.

The third lens 230 has positive refractive power and is made of plastic material. Its object side 232 is concave, its image side 234 is convex, and both are aspherical, and its object side 232 and image side 234 both have a double inflection point.

The fourth lens 240 has negative refractive power and is made of plastic material. Its object side 242 is convex, its image side 244 is concave, and both are aspherical, and both its object side 242 and image side 244 have an inflection point.

The fifth lens 250 has positive refractive power and is made of plastic material. Its object side 252 is convex, its image side 254 is concave, and both are aspherical, and its object side 252 has an inflection point and the image side 254 has three Recurve point.

The sixth lens 260 has a negative refractive power and is made of plastic material. Its object side 262 is convex, its image side 264 is concave, and both are aspherical, and its object side 262 has two inflexions and the image side 264 has a Recurve 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 280 is made of glass, which is disposed between the sixth lens 260 and the infrared imaging surface 290 and does not affect the focal length of the optical imaging system.

Please refer to Table 3 and Table 4 below.

Table 4. Aspheric coefficients of the second embodiment

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.

The following conditional values can be obtained according to Table 3 and Table 4:

According to Table 3 and Table 4, the values related to the length of the profile curve can be obtained:

The following values can be obtained according to Table 3 and Table 4:

Third embodiment

Please refer to FIG. 3A, FIG. 3B and FIG. 3C, where 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 third embodiment. Graph of spherical aberration, astigmatism and optical distortion of optical imaging system. FIG. 3C is a lateral aberration diagram of the optical imaging system of the third embodiment at a field of view of 0.7. As can be seen from FIG. 3A, the optical imaging system 30 includes a first lens 310, a second lens 320, an aperture 300, a third lens 330, a fourth lens 340, a fifth lens 350, and a sixth lens in order from the object side to the image side 360, an infrared filter 380, an infrared imaging surface 390, and an image sensing element 392.

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

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

The third lens 330 has negative refractive power and is made of plastic material. Its object side 332 is concave, its image side 334 is concave, and both are aspherical, and its object side 332 has an inflection point and the image side 334 has three Recurve point.

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

The fifth lens 350 has a positive refractive power and is made of plastic material. Its object side 352 is convex, its image side 354 is convex, and both are aspherical, and its object side 352 and image side 354 have two inflexions.

The sixth lens 360 has a negative refractive power and is made of plastic material. Its object side 362 is concave, its image side 364 is concave, and both are aspherical, and its object side 362 has two inverse curvature points and the image side 364 has a Recurve 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 380 is made of glass, which is disposed between the sixth lens 360 and the infrared imaging surface 390 and does not affect the focal length of the optical imaging system.

Please refer to Table 5 and Table 6 below.

Table 6. Aspheric coefficients of the third embodiment

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.

The following conditional values can be obtained according to Table 5 and Table 6:

According to Table 5 and Table 6, the following values related to the length of the profile curve can be obtained:

The following conditional values can be obtained according to Table 5 and Table 6:

Fourth embodiment

Please refer to FIGS. 4A, 4B, and 4C, where 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 fourth embodiment. Graph of spherical aberration, astigmatism and optical distortion of optical imaging system. FIG. 4C is a lateral aberration diagram of the optical imaging system of the fourth embodiment at a field of view of 0.7. As can be seen from FIG. 4A, the optical imaging system 40 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 a sixth lens in order from the object side to the image side 460, an infrared filter 480, an infrared imaging surface 490, and an image sensing element 492.

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

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

The third lens 430 has a negative refractive power and is made of plastic material. Its object side 432 is concave, its image side 434 is convex, and both are aspherical, and its object side 432 has a double inflection point.

The fourth lens 440 has a positive refractive power and is made of plastic material. Its object side 442 is convex, its image side 444 is concave, and both are aspherical, and its object side 442 and image side 444 both have an inflection point.

The fifth lens 450 has positive refractive power and is made of plastic material. Its object side 452 is convex, its image side 454 is convex, and both are aspherical, and its object side 452 and image side 454 both have an inflection point.

The sixth lens 460 has a negative refractive power and is made of plastic. Its object side 462 is convex, its image side 464 is concave, and both are aspherical, and its object side 462 has an inflexion point and the image side 464 has two Recurve 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 480 is made of glass, which is disposed between the sixth lens 460 and the infrared imaging surface 490 and does not affect the focal length of the optical imaging system.

Please refer to Table 7 and Table 8 below.

Table 8. Aspheric coefficients of the fourth embodiment

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.

The following conditional values can be obtained according to Table 7 and Table 8:

According to Table 7 and Table 8, the following values related to the length of the profile curve can be obtained:

The following conditional values can be obtained according to Table 7 and Table 8:

Fifth embodiment

Please refer to FIG. 5A, FIG. 5B and FIG. 5C, wherein FIG. 5A shows a schematic diagram of an optical imaging system according to the fifth embodiment of the present creation, and FIG. 5B is from left to right in order for the fifth embodiment. Graph of spherical aberration, astigmatism and optical distortion of optical imaging system. FIG. 5C is a lateral aberration diagram of the optical imaging system of the fifth embodiment at a field of view of 0.7. As can be seen from FIG. 5A, the optical imaging system 50 includes a first lens 510, an aperture 500, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, and a sixth lens in order from the object side to the image side 560, an infrared filter 580, an infrared imaging surface 590, and an image sensing element 592.

The first lens 510 has a negative refractive power and is made of plastic. Its object side 512 is convex, its image side 514 is concave, and both are aspherical, and both its object side 512 and image side 514 have an inflection point.

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

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

The fifth lens 550 has positive refractive power and is made of plastic material. Its object side 552 is convex, its image side 554 is convex, and both are aspherical, and its object side 552 and image side 554 both have an inflection point.

The sixth lens 560 has a negative refractive power and is made of plastic material. Its object side 562 is concave, its image side 564 is convex, and both are aspherical, and its object side 562 has an inflection point and the image side 564 has two Recurve 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 correct the aberration of the off-axis field of view.

The infrared filter 580 is made of glass, which is disposed between the sixth lens 560 and the infrared imaging surface 590 and does not affect the focal length of the optical imaging system.

Please refer to Table 9 and Table 10 below.

Table 10. Aspheric coefficients of the fifth embodiment

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.

The following conditional values can be obtained according to Table 9 and Table 10:

According to Table 9 and Table 10, the following values related to the length of the profile curve can be obtained:

The following conditional values can be obtained according to Table 9 and Table 10:

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 lateral aberration diagram of the optical imaging system of the sixth embodiment at a field of view of 0.7. 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 a sixth lens 660 in order from the object side to the image side , Infrared filter 680, infrared imaging surface 690, and image sensing element 692.

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

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

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

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

The fifth lens 650 has a positive refractive power and is made of plastic material. Its object side 652 is convex, its image side 654 is convex, and both are aspherical, and its object side 652 has a tri-reflection point and the image side 654 has a Recurve point.

The sixth lens 660 has a negative refractive power and is made of plastic material. Its object side 662 is convex, its image side 664 is concave, and both are aspherical, and its object side 662 has two reflex points and the image side 664 has a Recurve point. In this way, it is helpful to shorten the back focal length to maintain miniaturization, and it can also 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.

The infrared filter 680 is made of glass, which is disposed between the sixth lens 660 and the infrared imaging surface 690 and does not affect the focal length of the optical imaging system.

Please refer to Table 11 and Table 12 below.

Table 12. Aspheric coefficients of the sixth embodiment

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.

The following conditional values can be obtained according to Table 11 and Table 12:

According to Table 11 and Table 12, the values related to the length of the contour curve can be obtained:

The following conditional values can be obtained according to Table 11 and Table 12:

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.

200‧‧‧ Aperture

210‧‧‧First lens

212‧‧‧Side

214‧‧‧Like the side

220‧‧‧Second lens

222‧‧‧Side

224‧‧‧Like the side

230‧‧‧third lens

232

234‧‧‧Like the side

240‧‧‧ fourth lens

242‧‧‧Side

244‧‧‧Like the side

250‧‧‧ fifth lens

252‧‧‧Side

254‧‧‧Like the side

260‧‧‧Sixth lens

262‧‧‧Side

264‧‧‧Like the side

280‧‧‧Infrared filter

290‧‧‧Infrared filter infrared imaging surface

292‧‧‧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; A sixth lens with refractive power; and An infrared imaging surface; Wherein the optical imaging system has six lenses with refractive power, at least one of the first lens to the sixth lens has positive refractive power, the focal length of the optical imaging system is f, and the diameter of the entrance pupil of the optical imaging system is HEP, the pupil diameter of the sixth lens image side is HXP, half of the maximum viewing angle of the optical imaging system is HAF, the intersection of any surface of any of these lenses and the optical axis is the starting point, along the surface Until the coordinate point on the surface at a vertical height of 1/2HXP from the optical axis, the length of the contour curve between the two points is ARE, which meets the following conditions: 0.5≦f/HEP≦1.8; 0deg<HAF≦50deg And 0.9≦2(ARE/HEP)≦2.0. The optical imaging system according to claim 1, wherein the wavelength of the infrared light is between 700 nm and 1300 nm and the first spatial frequency is represented by SP1, which satisfies the following condition: SP1≦440cycles/mm. 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≦220cycles/mm. The optical imaging system according to claim 3, wherein the TV distortion of the optical imaging system at the time of imaging is TDT, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the infrared imaging surface, the optical The longest working wavelength of the positive meridian plane fan of the imaging system passes the edge of the entrance pupil and is incident on the infrared light imaging plane. The lateral aberration at 0.7 HOI is expressed by PLTA, and the shortest working wavelength of its positive meridian plane fan passes The lateral aberration of the entrance pupil edge and incident on the infrared light imaging plane at 0.7 HOI is represented by PSTA, and the longest operating wavelength of the negative meridian plane fan passes through the entrance pupil edge and is incident on the infrared light imaging plane at 0.7 HOI The lateral aberration at the location is expressed in NLTA, the shortest operating wavelength of the negative meridian plane fan passes through the edge of the entrance pupil and is incident on the infrared light imaging surface. The lateral aberration at 0.7HOI is expressed in NSTA, the longest sagittal plane fan The lateral aberration of the operating wavelength passing through the edge of the entrance pupil and incident on the infrared light imaging surface at 0.7 HOI is represented by SLTA, and the shortest operating wavelength of the sagittal plane fan passes through the entrance pupil edge and is incident on the infrared light imaging surface. The lateral aberration at the HOI is expressed by SSTA, which satisfies the following conditions: the longest operating wavelength is 960 nm; the shortest operating wavelength is 850 nm; PLTA≦100 μm; PSTA≦100 μm; NLTA≦100 μm; NSTA≦100 μm; SLTA ≦100 microns; and SSTA≦100 microns; |TDT|<100%. The optical imaging system according to claim 1, wherein the maximum effective radius of any surface of any one of the lenses is represented by EHD, and the intersection point of any surface of any of the lenses and the optical axis is the starting point, Along the contour of the surface until the maximum effective radius of the surface is the end point, the length of the contour curve between the aforementioned two points is ARS, which satisfies the following formula: 0.9≦ARS/EHD≦2.0. 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 third lens and the fourth lens on the optical axis is IN34, which meets the following conditions: IN12>IN34. The optical imaging system according to claim 1, wherein the distance between the fourth lens and the fifth lens on the optical axis is IN45, and the distance between the fifth lens and the sixth lens on the optical axis is IN56, which meets the following conditions: IN56>IN34. 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: IN45>IN34. 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, and from the object side of the first lens to the infrared imaging surface There is a distance HOS on the shaft, 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; A sixth lens with refractive power; and An infrared imaging surface; There are six 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 sixth lens has at least one inflection point, and at least one of the first lens to the sixth lens A lens has a positive refractive power, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, the exit pupil diameter of the sixth lens image side is HXP, and half of the maximum viewing angle of the optical imaging system is HAF, the intersection of any surface of any of these lenses with the optical axis is the starting point, along the contour of the surface straight Up to the coordinate point on the surface at a vertical height of 1/2HXP from the optical axis, the length of the contour curve between the two points is ARE, which satisfies the following conditions: 0.5≦f/HEP≦1.5; 0deg<HAF≦50deg; and 0.9≦2(ARE/HEP)≦2.0. The optical imaging system according to claim 10, wherein the maximum effective radius of any surface of any one of the lenses is represented by EHD, and the intersection point of any surface of any of the lenses and the optical axis is the starting point, Along the contour of the surface until the maximum effective radius of the surface is the end point, the length of the contour curve between the aforementioned two points is ARS, which satisfies the following formula: 0.9≦ARS/EHD≦2.0. 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, and the object side of the first lens to the infrared imaging surface is on the optical axis With a distance HOS, it satisfies the following conditions: 0.5≦HOS/HOI≦6. The optical imaging system according to claim 10, further comprising an aperture, the aperture being located in front of the image side of the third lens. The optical imaging system according to claim 10, wherein the image side of the second lens is convex on the optical axis. The optical imaging system according to claim 10, wherein the object side of the fifth lens is convex on the optical axis. The optical imaging system according to claim 10, wherein the object side of the fourth lens is convex on the optical axis and the image side is convex on the optical axis. 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, which satisfies the following conditions: 0.5≦f/HEP≦1.4. The optical imaging system according to claim 10, wherein all of the first lens to the sixth lens are made of plastic. 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; A sixth lens with refractive power; and An infrared imaging surface; There are six lenses with refractive power in the optical imaging system, and at least one surface of at least two of the first lens to the sixth lens has at least one inflection point. The focal length of the optical imaging system is f, The entrance pupil diameter of the optical imaging system is HEP, the exit pupil diameter of the sixth lens image side is HXP, half of the maximum angle of view of the optical imaging system is HAF, and any surface of any of the lenses and the optical axis The intersection point is the starting point, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2HXP from the optical axis. The length of the contour curve between the two points is ARE, which meets the following conditions: 0.5≦f/HEP ≦1.3; 0deg<HAF≦45deg; and 0.9≦2(ARE/HEP)≦2.0. The optical imaging system according to claim 20, wherein the object side of the first lens to the infrared imaging surface has a distance HOS on the optical axis, and the optical imaging system satisfies the following formula: 0mm<HOS≦20mm. 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≦220cycles/mm. The optical imaging system according to claim 20, wherein the materials of the first lens to the sixth lens are all plastic materials. 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, the distance between the fourth lens and the fifth lens on the optical axis is IN45, the fifth lens and the sixth lens The distance between the lenses on the optical axis is IN56, which satisfies the following conditions: IN12>IN34; IN45>IN34; and IN56>IN34. The optical imaging system according to claim 20, wherein the optical imaging system further includes an aperture and an image sensing element, the image sensing element is disposed behind the infrared imaging surface and at least 100,000 pixels are disposed, and The aperture to the infrared imaging surface has a distance InS on the optical axis, and the first lens object side to the infrared imaging surface has a distance HOS on the optical axis, which satisfies the following formula: 0.2≦InS/HOS≦1.1 .

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