CN211454080U - Optical imaging system - Google Patents
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- CN211454080U CN211454080U CN202020387456.9U CN202020387456U CN211454080U CN 211454080 U CN211454080 U CN 211454080U CN 202020387456 U CN202020387456 U CN 202020387456U CN 211454080 U CN211454080 U CN 211454080U
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Abstract
The utility model provides an optical imaging system contains first lens, second lens, third lens, fourth lens, fifth lens and sixth lens by thing side to picture side in proper order. At least one of the first lens element to the fifth lens element has positive refractive power. The sixth lens element with negative refractive power has two aspheric surfaces, and at least one of the surfaces of the sixth lens element has an inflection point. The lenses with refractive power in the optical imaging system are the first lens to the sixth lens. When the specific conditions are met, the optical imaging device can have larger light receiving capacity and better optical path adjusting capacity so as to improve the imaging quality.
Description
Technical Field
The utility model relates to an optical imaging system, concretely relates to be applied to miniaturized optical imaging system on electronic product.
Background
In recent years, with the rise of portable electronic products having a photographing function, the demand for optical systems has been increasing. The photosensitive elements of a general optical system are not limited to a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Sensor, and with the refinement of Semiconductor process technology, the pixel size of the photosensitive elements is reduced, and the optical system is gradually developed in the field of high pixels, so that the requirements for imaging quality are increased.
The conventional optical system mounted on the portable device mainly adopts a four-piece or five-piece lens structure, however, the known optical imaging system cannot meet the higher-order photographic requirements due to the continuous trend of the portable device to raise pixels and the requirements of the end consumer for large apertures, such as low-light and night-shooting functions.
Therefore, how to effectively increase the light-entering amount of the optical imaging system and further improve the imaging quality becomes a very important issue.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optical imaging system can utilize the combination of the refractive power of six lenses, convex surface and concave surface (convex surface or concave surface mean the object side face of each lens in principle or the description that the image side face changes apart from the geometric shape of optical axis co-altitude not), and then effectively improve optical imaging system's the light inlet, improve the image quality simultaneously to be applied to on miniature electronic product.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
an optical imaging system, comprising, in order from an object side to an image side:
a first lens element with refractive power; a second lens element with refractive power;
a third lens element with refractive power; a fourth lens element with refractive power;
a fifth lens element with refractive power; a sixth lens element with refractive power; and an infrared light imaging plane;
wherein the optical imaging system has six lenses with refractive power, at least one of the first lens element to the sixth lens element has positive refractive power, the focal length of the optical imaging system is f, the diameter of the entrance pupil of the optical imaging system is HEP, the diameter of the exit pupil of the image-side surface of the sixth lens element is HXP, half of the maximum viewing angle of the optical imaging system is HAF, the intersection point of any surface of any one of the lens elements and the optical axis is the starting point, the contour curve length between the two points is ARE AREs along the contour of the surface until the coordinate point on the surface at the vertical height from the optical axis 1/2HXP, and the following conditions ARE satisfied: f/HEP is more than or equal to 0.5 and less than or equal to 1.8; 0deg < HAF <50 deg and 0.9 < 2(ARE/HEP) < 2.0.
Preferably, wherein the wavelength of the infrared light is between 700nm and 1300nm and the first spatial frequency is represented by SP1, the following conditions are satisfied: SP1 is less than or equal to 440 cycles/mm.
Preferably, wherein the wavelength of the infrared light is between 850nm and 960nm and the first spatial frequency is denoted by SP1, the following condition is satisfied: SP1 is less than or equal to 220 cycles/mm.
Preferably, the TV distortion of the optical imaging system during imaging is TDT, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the infrared light imaging plane, the lateral aberration of the optical imaging system at 0.7HOI passing through the entrance pupil edge and incident on the infrared light imaging plane is represented by PLTA, the lateral aberration of the optical imaging system at 0.7HOI passing through the entrance pupil edge and incident on the infrared light imaging plane is represented by PSTA, the longest operating wavelength of the optical imaging system at negative meridian is represented by NLTA, the shortest operating wavelength of the optical imaging system at 0.7HOI passing through the entrance pupil edge and incident on the infrared light imaging plane is represented by NSTA, the lateral aberration of the optical imaging system at 0.7HOI passing through the entrance pupil edge and incident on the infrared light imaging plane is represented by NSTA, the lateral aberration of the sagittal plane light fan, which has the longest operating wavelength passing through the entrance pupil edge and is incident at 0.7HOI on the infrared light imaging plane, is denoted by SLTA, and the lateral aberration of the sagittal plane light fan, which has the shortest operating wavelength passing through the entrance pupil edge and is incident at 0.7HOI on the infrared light imaging plane, is denoted by SSTA, which satisfies the following conditions: the longest working wavelength is 960 nm; the shortest working wavelength is 850 nm; PLTA is less than or equal to 100 microns; PSTA not more than 100 microns; NLTA is less than or equal to 100 micrometers; NSTA is less than or equal to 100 microns; SLTA is less than or equal to 100 microns; and SSTA of less than or equal to 100 microns; TDT | is < 100%.
Preferably, wherein the maximum effective radius of any surface of any one of the lenses is expressed as EHD, the intersection point of any surface of any one of the lenses with the optical axis is a starting point, the end point is along the contour of the surface up to the maximum effective radius of the surface, and the length of the contour curve between the two aforementioned points is ARS, which satisfies the following formula: 0.9-2.0 of ARS/EHD.
Preferably, wherein a distance between the first lens and the second lens on the optical axis is IN12, and a distance between the third lens and the fourth lens on the optical axis is IN34, satisfies the following conditions: IN12> IN 34.
Preferably, wherein a distance between the fourth lens and the fifth lens on the optical axis is IN45, and a distance between the fifth lens and the sixth lens on the optical axis is IN56, which satisfy the following conditions: IN56> IN 45.
Preferably, wherein a distance between the third lens and the fourth lens on the optical axis is IN34, and a distance between the fourth lens and the fifth lens on the optical axis is IN45, which satisfy the following conditions: IN45> IN 34.
Preferably, an aperture stop is further included, and a distance InS on an optical axis is provided between the aperture stop and the infrared light imaging plane, and a distance HOS on the optical axis is provided between the first lens object-side surface and the infrared light imaging plane, which satisfies the following formula: 0.2-1.1 of InS/HOS.
The utility model provides an optical imaging system, an optical imaging system who provides in addition contains by thing side to picture side in proper order:
a first lens element with refractive power; a second lens element with refractive power;
a third lens element with refractive power; a fourth lens element with refractive power;
a fifth lens element with refractive power; a sixth lens element with refractive power; and an infrared light imaging plane;
wherein the optical imaging system has six lenses with refractive power, at least one surface of at least one of the first lens element to the sixth lens element has at least one inflection point, at least one of the first lens element to the sixth lens element has positive refractive power, the focal length of the optical imaging system is f, the diameter of the entrance pupil of the optical imaging system is HEP, the diameter of the exit pupil of the image side of the sixth lens element is HXP, half of the maximum viewing angle of the optical imaging system is HAF, the intersection point of any one surface of any one of the lenses and the optical axis is the starting point, the contour of the surface is followed until the point on the surface at the vertical height from the optical axis HXP 1/2 p, the length of the contour curve between the two points is ARE AREs, and the following conditions ARE satisfied: f/HEP is more than or equal to 0.5 and less than or equal to 1.5; 0deg < HAF ≤ 50 deg; and 0.9 is less than or equal to 2(ARE/HEP) is less than or equal to 2.0.
Preferably, wherein the maximum effective radius of any surface of any one of the lenses is expressed as EHD, the intersection point of any surface of any one of the lenses with the optical axis is a starting point, the end point is along the contour of the surface up to the maximum effective radius of the surface, and the length of the contour curve between the two aforementioned points is ARS, which satisfies the following formula: 0.9-2.0 of ARS/EHD.
Preferably, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the infrared light imaging plane, the first lens object-side surface has a distance HOS from the infrared light imaging plane on the optical axis, which satisfies the following condition: HOS/HOI is more than or equal to 0.5 and less than or equal to 6.
Preferably, the lens further comprises an aperture, and the aperture is located in front of the image side surface of the third lens.
Preferably, the image side surface of the second lens is convex on the optical axis.
Preferably, wherein the object side surface of the fifth lens is convex on the optical axis.
Preferably, the object side surface of the fourth lens is convex on the optical axis and the image side surface is convex on the optical axis.
Preferably, the image side surface of the fourth lens is convex on the optical axis.
Preferably, it satisfies the following conditions: f/HEP is more than or equal to 0.5 and less than or equal to 1.4.
Preferably, all of the first lens element to the sixth lens element are made of plastic material.
The utility model provides an optical imaging system, an optical imaging system who provides in addition contains by thing side to picture side in proper order:
a first lens element with refractive power; a second lens element with refractive power;
a third lens element with refractive power; a fourth lens element with refractive power;
a fifth lens element with refractive power; a sixth lens element with refractive power; and an infrared light imaging plane;
wherein the optical imaging system comprises six lenses with refractive power, at least one surface of each of at least two lenses 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 image-side surface of the sixth lens is HXP, half of the maximum viewing angle of the optical imaging system is HAF, the intersection point of any surface of any lens of the lenses and the optical axis is the starting point, the contour curve length between the two points is ARE along the contour of the surface until the coordinate point on the surface at the vertical height from the optical axis 1/2HXP, and the following conditions ARE satisfied: f/HEP is more than or equal to 0.5 and less than or equal to 1.3; 0deg < HAF ≤ 45 deg; and 0.9 is less than or equal to 2(ARE/HEP) is less than or equal to 2.0.
Preferably, wherein the first lens object-side surface has a distance HOS on the optical axis to the infrared light imaging surface, the optical imaging system satisfies the following formula: HOS is more than 0mm and less than or equal to 20 mm.
Preferably, wherein the wavelength of the infrared light is between 850nm and 960nm and the first spatial frequency is denoted by SP1, the following condition is satisfied: SP1 is less than or equal to 220 cycles/mm.
Preferably, the first lens element to the sixth lens element are all made of plastic material.
Preferably, wherein a distance between the first lens and the second lens on the optical axis is IN12, a distance between the second lens and the third lens on the optical axis is IN23, a distance between the third lens and the fourth lens on the optical axis is IN34, a distance between the fourth lens and the fifth lens on the optical axis is IN45, and a distance between the fifth lens and the sixth lens on the optical axis is IN56, satisfies the following conditions: IN12> IN 34; IN45> IN 34; and IN56> IN 45.
Preferably, the optical imaging system further includes an aperture stop, an image sensor disposed behind the infrared imaging plane and having at least 10 ten thousand pixels, and a distance InS on an optical axis from the aperture stop to the infrared imaging plane, and a distance HOS on the optical axis from the object-side surface of the first lens to the infrared imaging plane, which satisfy the following formula: 0.2-1.1 of InS/HOS.
Compared with the prior art, the utility model has the following advantage:
the utility model provides a pair of optical imaging system, the object side or the image side of its sixth lens can be provided with anti-curved point, can effectively adjust each visual field and incide in the angle of sixth lens to revise to optical distortion and TV distortion. In addition, the surface of the sixth lens can have better optical path adjusting capability so as to improve the imaging quality.
The profile curve length of any surface of a single lens in the maximum effective radius range affects the ability of the surface to correct aberrations and optical path differences between the light beams of each field, and the longer the profile curve length, the higher the aberration correction ability, but at the same time, the difficulty in manufacturing is increased, so that the profile curve length of any surface of a single lens in the maximum effective radius range must be controlled, and particularly, the proportional relationship (ARS/TP) between the profile curve length (ARS) of the surface in the maximum effective radius range and the Thickness (TP) of the lens on the optical axis to which the surface belongs must be controlled. For example, the length of the profile curve of the maximum effective radius of the object-side surface of the first lens is represented by ARS11, the thickness of the first lens on the optical axis is TP1, the ratio of the two is ARS11/TP1, the length of the profile curve of the maximum effective radius of the image-side surface of the first lens is represented by ARS12, and the ratio of the length of the profile curve of the maximum effective radius of the image-side surface of the first lens to TP1 is ARS12/TP 1. The length of the profile curve of the maximum effective radius of the object-side surface of the second lens is shown as ARS21, the thickness of the second lens on the optical axis is TP2, the ratio of the two is ARS21/TP2, the length of the profile curve of the maximum effective radius of the image-side surface of the second lens is shown as ARS22, and the ratio of the length of the profile curve of the maximum effective radius of the image-side surface of the second lens to TP2 is ARS22/TP 2. The proportion of the length of the profile curve of the maximum effective radius of any surface of the rest of the lenses in the optical imaging system to the Thickness (TP) of the lens to which the surface belongs on the optical axis is expressed in the same way.
The profile length of any surface of the single lens in the height range of 1/2 entrance pupil diameter (HEP) particularly affects the ability of the surface to correct aberrations in the shared area of each field of view and the optical path difference between the light beams of each field of view, and the longer the profile length, the higher the ability to correct aberrations, but also increases the difficulty of manufacturing, so the ratio (ARE/TP) between the profile length of any surface of the single lens in the height range of 1/2 entrance pupil diameter (HEP), particularly between the profile length (ARE) in the height range of 1/2 entrance pupil diameter (HEP) of the surface and the Thickness (TP) of the lens on the optical axis to which the surface belongs must be controlled. For example, the length of the profile curve of the 1/2 entrance pupil diameter (HEP) height of the object-side surface of the first lens is ARE11, the thickness of the first lens on the optical axis is TP1, the ratio of the two is ARE11/TP1, the length of the profile curve of the 1/2 entrance pupil diameter (HEP) height of the image-side surface of the first lens is ARE12, and the ratio of the length of the profile curve to the TP1 is ARE12/TP 1. The length of the profile curve of the 1/2 entrance pupil diameter (HEP) height of the object-side surface of the second lens is represented by ARE21, the thickness of the second lens on the optical axis is TP2, the ratio of the two is ARE21/TP2, the length of the profile curve of the 1/2 entrance pupil diameter (HEP) height of the image-side surface of the second lens is represented by ARE22, and the ratio of the length of the profile curve to TP2 is ARE22/TP 2. The relationship between the length of the profile curve of 1/2 entrance pupil diameter (HEP) height of any surface of the remaining lenses in the optical imaging system and the Thickness (TP) of the lens on the optical axis to which that surface belongs is expressed by analogy.
When f 1-f 6-is used, the total Height (HOS) of the optical imaging System can be reduced to achieve miniaturization.
When f2 | + -f 3 | + -f 4 | + -f 5 | -f 1 | + -f 6 |, the lens elements have weak positive refractive power or weak negative refractive power. The term "weak refractive power" refers to the absolute value of the focal length of a particular lens element greater than 10 mm. When the present invention is applied to at least one of the second lens element and the fifth lens element, the at least one of the second lens element and the fifth lens element has weak positive refractive power, so that the positive refractive power of the first lens element can be effectively shared to prevent the unwanted aberration from occurring too early, and otherwise, the aberration of the compensating system can be finely adjusted if the at least one of the second lens element and the fifth lens element has weak negative refractive power.
In addition, the sixth lens element with negative refractive power may have a concave image-side surface. Thereby, the back focal length is advantageously shortened to maintain miniaturization. In addition, at least one surface of the sixth lens element can have at least one point of inflection, which can effectively suppress the incident angle of the light in the off-axis field of view, and further correct the aberration in the off-axis field of view.
Drawings
The above and other features of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic view of an optical imaging system according to a first embodiment of the present invention;
fig. 2 is a graph showing spherical aberration, astigmatism and optical distortion of the optical imaging system according to the first embodiment of the present invention;
fig. 3 is a lateral aberration diagram of the meridional fan and sagittal 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 aperture edge at 0.7 field of view;
fig. 4 is a schematic diagram of an optical imaging system according to a second embodiment of the present invention;
fig. 5 is a graph showing a spherical aberration, astigmatism and optical distortion of the optical imaging system according to the second embodiment of the present invention from left to right;
fig. 6 is a lateral aberration diagram of the meridional and sagittal fans of the optical imaging system of the second embodiment of the present invention, the longest operating wavelength and the shortest operating wavelength passing through the aperture edge at 0.7 field of view;
fig. 7 is a schematic diagram of an optical imaging system according to a third embodiment of the present invention;
fig. 8 is a graph showing a spherical aberration, astigmatism and optical distortion of the optical imaging system according to the third embodiment of the present invention from left to right;
fig. 9 is a lateral aberration diagram of the meridional and sagittal fans of the optical imaging system of the third embodiment of the present invention, with the longest and shortest operating wavelengths passing through the aperture edge at 0.7 field of view;
fig. 10 is a schematic view of an optical imaging system according to a fourth embodiment of the present invention;
fig. 11 is a graph showing spherical aberration, astigmatism and optical distortion of the optical imaging system according to the fourth embodiment of the present invention from left to right;
fig. 12 is a lateral aberration diagram of the meridional and sagittal fans of the optical imaging system of the fourth embodiment of the invention, with the longest and shortest operating wavelengths passing through the aperture edge at 0.7 field of view;
fig. 13 is a schematic view of an optical imaging system according to a fifth embodiment of the present invention;
fig. 14 is a graph showing a spherical aberration, astigmatism and optical distortion of the optical imaging system according to the fifth embodiment of the present invention from left to right;
fig. 15 is a lateral aberration diagram of the meridional fan and sagittal fan of the optical imaging system of the fifth embodiment of the invention, the longest operating wavelength and the shortest operating wavelength passing through the aperture edge at 0.7 field of view;
fig. 16 is a schematic view of an optical imaging system according to a sixth embodiment of the present invention;
fig. 17 is a graph showing a spherical aberration, astigmatism and optical distortion of the optical imaging system according to the sixth embodiment of the present invention from left to right in sequence;
fig. 18 is a lateral aberration diagram of the meridional fan and sagittal fan of the optical imaging system according to the sixth embodiment of the present invention, with the longest operating wavelength and the shortest operating wavelength passing through the aperture edge at the 0.7 field of view.
Description of the symbols
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 object side
114,214,314,414,514,614 image side
120,220,320,420,520,620 second lens
122,222,322,422,522,622 object side
124,224,324,424,524,624 image side
130,230,330,430,530,630 third lens
132,232,332,432,532,632 object side
134,234,334,434,534,634 image side
140,240,340,440,540,640 fourth lens
142,242,342,442,542,642 object side
Image side 144,244,344,444,544,644
150,250,350,450,550,650 fifth lens
152,252,352,452,552,652 object side
154,254,354,454,554,654 image side
160,260,360,460,560,660 sixth lens
162,262,362,462,562,662 object side
164,264,364,464,564,664 image side
180,280,380,480,580,680 infrared filter
190,290,390,490,590,690 infrared light imaging plane
192,292,392,492,592,692 image sensor
f focal length of optical imaging system
f1, f2, f3, f4, f5 and f6 focal lengths of the first lens to the sixth mirror
Aperture value of F/HEP, Fno, F # -optical imaging system
HAF half of maximum viewing angle of optical imaging system
NA1, NA2, NA3, NA4, NA5, NA6 Abbe's number
R1, R2 radius of curvature of object-side and image-side surfaces of first lens
R3, R4 radius of curvature of object-side and image-side surfaces of second lens
R5, R6 radius of curvature of object-side and image-side surfaces of third lens
R7, R8 radius of curvature of object-side and image-side surfaces of fourth lens
R9, R10 radius of curvature of object-side and image-side surfaces of fifth lens
R11, R12 radius of curvature of object-side and image-side surfaces of sixth lens
TP1, TP2, TP3, TP4, TP5 and TP6, the thicknesses of the first lens to the sixth lens on the optical axis
Sigma TP, sum of thicknesses of all lenses with refractive power
IN12 optical axis distance between the first and second lenses
IN23 distance between the second lens and the third lens on optical axis
IN34 distance between the third lens and the fourth lens on optical axis
IN45 optical axis distance between the fourth lens and the fifth lens
IN56 distance between fifth lens and sixth lens on optical axis
InRS61 horizontal displacement distance from the intersection point of the object side surface of the sixth lens on the optical axis to the position of the maximum effective radius of the object side surface of the sixth lens on the optical axis
IF611, the inflection point on the object-side surface of the sixth lens closest to the optical axis; SGI611 amount of subsidence at this point
HIF611 vertical distance between inflection point closest to optical axis on object-side surface of sixth lens and optical axis
IF621, an inflection point on the image-side surface of the sixth lens closest to the optical axis; SGI621 amount of subsidence at this point
HIF621 vertical distance between inflection point closest to optical axis on image side of sixth lens and optical axis
IF612, a second inflection point on the object-side surface of the sixth lens, near the optical axis; SGI612 amount of subsidence at this point
HIF612 vertical distance between inflection point of second approximate optical axis on object-side surface of sixth lens and optical axis
IF622, a second inflection point near the optical axis on the image-side surface of the sixth lens; SGI622 amount of subsidence at this point
HIF622, vertical distance between second inflection point near optical axis on image side of sixth lens and optical axis
C61 critical point of object side of sixth lens
C62 critical point of image side surface of sixth lens
SGC61 horizontal displacement distance of critical point of object side surface of sixth lens and optical axis
SGC62 horizontal displacement distance between critical point of image side surface of sixth lens and optical axis
HVT61 perpendicular distance between critical point of object-side surface of sixth lens and optical axis
HVT62 vertical distance between critical point of image side surface of sixth lens and optical axis
HOS total height (distance on optical axis from object side of first lens to infrared imaging plane)
Dg is the diagonal length of the image sensing device
InS is the distance from the aperture to the infrared imaging surface
InTL is the distance from the object side surface of the first lens to the image side surface of the sixth lens
InB is the distance from the image side surface of the sixth lens to the infrared light imaging surface
HOI half of diagonal length of effective sensing area of image sensing element (maximum image height)
TDT TV Distortion of optical imaging system during imaging
ODT is the Optical Distortion (Optical Distortion) of an Optical imaging system during imaging.
The embodiment of the present invention relates to the following terms and their code numbers of the lens parameters, which are used as the reference for the following description:
lens parameters related to length or height:
the utility model discloses can select at visible light spectrum 555nm as main reference wavelength and measure the basis that the focus squinted, can select at infrared spectrum (700nm to 1300nm) wavelength 940nm as main reference wavelength and measure the basis that the focus squinted.
The optical imaging system has an infrared imaging plane which is an infrared imaging plane specific to a direction perpendicular to the optical axis and whose central field of view has a maximum value of out-of-focus modulation transfer contrast ratio (MTF) at a first spatial frequency.
The maximum imaging height of the optical imaging system is represented by HOI; the height of the optical imaging system is denoted by HOS; the distance between the object side surface of the first lens and the image side surface of the sixth lens of the optical imaging system is represented by InTL; the distance between a fixed diaphragm (aperture) of the optical imaging system and an infrared light imaging surface is expressed by InS; the distance between the first lens and the second lens of the optical imaging system is denoted (example) by IN 12; the thickness of the first lens of the optical imaging system on the optical axis is denoted by TP1 (example).
Material dependent lens parameters:
the abbe number of the first lens of the optical imaging system is denoted (example) by NA 1; the refractive index of the first lens is denoted by Nd1 (example).
Viewing angle-dependent lens parameters:
the viewing angle is denoted AF; half of the viewing angle is denoted by HAF; the chief ray angle is denoted MRA.
Lens parameters related to entrance and exit pupils:
the entrance pupil diameter of the optical imaging system is denoted by HEP; the diameter of an exit pupil of the image side of the sixth lens is HXP; the maximum Effective radius of any surface of a single lens refers to the vertical height between the intersection point (Effective halo Diameter; EHD) of the light rays of the incident light passing through the extreme edge of the entrance pupil at the maximum viewing angle of the system and the optical axis. For example, the maximum effective radius of the object-side surface of the first lens is indicated by EHD11 and the maximum effective radius of the image-side surface of the first lens is indicated by EHD 12. The maximum effective radius of the object-side surface of the second lens is indicated by EHD21 and the maximum effective radius of the image-side surface of the second lens is indicated by EHD 22. The maximum effective radius of any surface of the remaining lenses in the optical imaging system is expressed and so on.
Parameters related to the lens surface profile arc length and surface profile:
the maximum effective radius profile curve length of any surface of a single lens refers to the maximum effective radius profile curve length represented by ARS, wherein the curve arc length between the two points is the starting point of the intersection point of the surface of the lens and the optical axis of the optical imaging system, and the curve arc length between the starting point and the surface of the lens is from the starting point to the end point of the maximum effective radius. For example, the profile curve length for the maximum effective radius of the object-side surface of the first lens is shown as ARS11 and the profile curve length for the maximum effective radius of the image-side surface of the first lens is shown as ARS 12. The profile curve length for the maximum effective radius of the object-side surface of the second lens is denoted as ARS21 and the profile curve length for the maximum effective radius of the image-side surface of the second lens is denoted as ARS 22. The length of the profile curve of the maximum effective radius of any surface of the remaining lenses in the optical imaging system is expressed in analogy.
The 1/2 contour curve length of the entrance pupil diameter (HEP) of any surface of a single lens means that the intersection point of the surface of the lens and the optical axis of the optical imaging system is taken as a starting point, the curve arc length between the two points is the contour curve length of 1/2 entrance pupil diameter (HEP) from the starting point along the surface contour of the lens to the coordinate point of the vertical height of the surface from the optical axis 1/2 entrance pupil diameter, and is expressed by ARE. For example, the contour curve length for the 1/2 entrance pupil diameter (HEP) of the object-side surface of the first lens is denoted as ARE11, and the contour curve length for the 1/2 entrance pupil diameter (HEP) of the image-side surface of the first lens is denoted as ARE 12. The contour curve length for the 1/2 entrance pupil diameter (HEP) of the object-side surface of the second lens is denoted as ARE21, and the contour curve length for the 1/2 entrance pupil diameter (HEP) of the image-side surface of the second lens is denoted as ARE 22. The profile curve length representation of 1/2 entrance pupil diameter (HEP) for either surface of the remaining lenses in the optical imaging system, and so on.
Parameters related to lens profile depth:
the distance between the intersection point of the object-side surface of the sixth lens on the optical axis and the end point of the maximum effective radius of the object-side surface of the sixth lens, which is horizontal to the optical axis, is represented by InRS61 (depth of maximum effective radius); the distance between the intersection point of the image-side surface of the sixth lens element on the optical axis and the end point of the maximum effective radius of the image-side surface of the sixth lens element, which is horizontal to the optical axis, is represented by InRS62 (depth of maximum effective radius). The depth (amount of depression) of the maximum effective radius of the object-side or image-side surface of the other lens is expressed in a manner comparable to that described above.
Parameters related to lens surface shape:
the critical point C is a point on the surface of the particular lens that is tangent to a tangent plane perpendicular to the optical axis, except for the intersection with the optical axis. In summary, for example, the perpendicular distance between the critical point C51 of the object-side surface of the fifth lens element and the optical axis is HVT51 (example), the perpendicular distance between the critical point C52 of the image-side surface of the fifth lens element and the optical axis is HVT52 (example), the perpendicular distance between the critical point C61 of the object-side surface of the sixth lens element and the optical axis is HVT61 (example), and the perpendicular distance between the critical point C62 of the image-side surface of the sixth lens element and the optical axis is HVT62 (example). The representation of the critical point on the object-side or image-side surface of the other lens and its perpendicular distance from the optical axis is comparable to the above.
The inflection point on the object-side surface of the sixth lens closest to the optical axis is IF611, the amount of depression SGI611 (for example) of this point, SGI611 is also the horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the sixth lens on the optical axis and the inflection point on the object-side surface of the sixth lens closest to the optical axis, and the vertical distance between this point of IF611 and the optical axis is HIF611 (for example). An inflection point on the image-side surface of the sixth lens closest to the optical axis is IF621, the depression amount SGI621 (for example), SGI611 is also a horizontal displacement distance parallel to the optical axis from the intersection point of the image-side surface of the sixth lens on the optical axis to the inflection point on the image-side surface of the sixth lens closest to the optical axis, and a vertical distance between the point of the IF621 and the optical axis is HIF621 (for example).
The second inflection point on the object-side surface of the sixth lens closer to the optical axis is IF612, the depression amount SGI612 (for example), SGI612 is also the horizontal displacement distance parallel to the optical axis from the intersection point of the object-side surface of the sixth lens on the optical axis to the second inflection point on the object-side surface of the sixth lens closer to the optical axis, and the vertical distance between the point of the IF612 and the optical axis is HIF612 (for example). An inflection point on the image-side surface of the sixth lens, which is second near the optical axis, is IF622, the depression amount SGI622 (for example) of the point, SGI622 is also a horizontal displacement distance parallel to the optical axis from the intersection point of the image-side surface of the sixth lens on the optical axis to the inflection point on the image-side surface of the sixth lens, which is second near the optical axis, and a vertical distance between the point of the IF622 and the optical axis is HIF622 (for example).
The third inflection point on the object-side surface of the sixth lens near the optical axis is IF613, the amount of depression SGI613 (for example), SGI613 is also the horizontal displacement distance parallel to the optical axis from the intersection point of the object-side surface of the sixth lens on the optical axis to the third inflection point on the object-side surface of the sixth lens near the optical axis, and the vertical distance between the point of IF613 and the optical axis is HIF613 (for example). The third inflection point on the image-side surface of the sixth lens close to the optical axis is IF623, the depression amount SGI623 (example), SGI623 is also the horizontal displacement distance parallel to the optical axis from the intersection point of the image-side surface of the sixth lens on the optical axis to the third inflection point on the image-side surface of the sixth lens close to the optical axis, and the vertical distance between the point of the IF623 and the optical axis is HIF623 (example).
The fourth inflection point on the object-side surface of the sixth lens near the optical axis is IF614, the depression amount SGI614 (for example), SGI614 is also the horizontal displacement distance parallel to the optical axis from the intersection point of the object-side surface of the sixth lens on the optical axis to the fourth inflection point on the object-side surface of the sixth lens near the optical axis, and the vertical distance between the point of the IF614 and the optical axis is HIF614 (for example). The fourth inflection point on the image-side surface of the sixth lens near the optical axis is IF624, the depression amount SGI624 (for example), SGI624 is also the horizontal displacement distance parallel to the optical axis from the intersection point of the image-side surface of the sixth lens on the optical axis to the fourth inflection point on the image-side surface of the sixth lens near the optical axis, and the vertical distance between the point of the IF624 and the optical axis is HIF624 (for example).
The representation of the inflection points on the object-side surface or the image-side surface of the other lens and the vertical distance between the inflection points and the optical axis or the amount of the depression of the inflection points is compared with the representation in the foregoing.
Aberration-related variables:
optical Distortion (Optical Distortion) of an Optical imaging system is expressed in ODT; its TV distortion (TVDistortion) is expressed in TDT and can further define the degree of aberration shift described between 50% and 100% imaging field of view; the spherical aberration offset is expressed as DFS; the coma aberration offset is denoted by DFC.
The lateral aberration at the aperture edge is expressed by sta (stop Transverse aberration), and the performance of a specific optical imaging system can be evaluated by calculating the lateral aberration of light in any field of view on a meridian fan (tangential fan) or a sagittal fan (sagittal fan), and particularly calculating the lateral aberration magnitude of the longest working wavelength (e.g. 940NM or 960NM wavelength) and the shortest working wavelength (e.g. 840NM or 850NM wavelength) passing through the aperture edge as the criterion of excellent performance. The coordinate directions of the meridian plane sectors can be further divided into positive (upward rays) and negative (downward rays). A lateral aberration in which the longest operating wavelength passes through the aperture edge, which is defined as a difference in distance between the imaging position of the longest operating wavelength incident on a specific field of view on the infrared light imaging plane through the aperture edge and the imaging position of the reference wavelength principal ray (e.g., wavelength of 940NM) on the infrared light imaging plane of the field of view, a lateral aberration in which the shortest operating wavelength passes through the aperture edge, which is defined as an imaging position of the shortest operating wavelength incident on a specific field of view on the infrared light imaging plane through the aperture edge and a difference in distance between the imaging position of the reference wavelength principal ray on the infrared light imaging plane of the field of view, the performance of the specific optical imaging system is evaluated to be excellent, and it is possible to use as an audit mode that lateral aberrations of the shortest and longest operating wavelengths incident on 0.7 field of view (i.e., 0.7 imaging height HOI) on the infrared light imaging plane through the aperture edge are each less than, even further, the transverse aberrations of 0.7 field of view incident on the infrared light imaging plane through the aperture edge at the shortest and longest operating wavelengths can be less than 80 micrometers (mum) as a verification means.
The optical imaging system has a maximum imaging height HOI on an infrared light imaging plane perpendicular to an optical axis, the transverse aberration at 0.7HOI on the infrared light imaging plane and passing through the edge of the entrance pupil is denoted by PLTA, the transverse aberration at 0.7HOI on the infrared light imaging plane and passing through the edge of the entrance pupil is denoted by PSTA, the transverse aberration at 0.7HOI on the infrared light imaging plane and passing through the edge of the entrance pupil is denoted by NLTA, the transverse aberration at 0.7HOI on the infrared light imaging plane and passing through the edge of the entrance pupil is denoted by NSTA, the transverse aberration at 0.7HOI on the infrared light imaging plane and passing through the edge of the entrance pupil is denoted by SLTA, and the transverse aberration at 0.7HOI on the infrared light imaging plane and passing through the edge of the entrance pupil is denoted by SLTA, the lateral aberration of the shortest operating wavelength of infrared light of the sagittal plane light fan passing through the entrance pupil edge and incident at 0.7HOI on the infrared light imaging plane is denoted SSTA.
Detailed Description
The invention will be further elucidated by a detailed description of a preferred embodiment in conjunction with the drawing.
An optical imaging system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and an infrared imaging surface. The optical imaging system further comprises an image sensing element arranged on the infrared light imaging surface.
The optical imaging system can be designed using three infrared operating wavelengths, 850nm, 940nm, 960nm, respectively, where 960nm is the reference wavelength where the dominant reference wavelength is the extraction technical feature.
The optical imaging system can be designed by using three visible light working wavelengths, namely 486.1nm, 587.5nm and 656.2nm, wherein 587.5nm is the reference wavelength with the main extraction technical characteristic as the main reference wavelength. The optical imaging system can also be designed using five operating wavelengths, 470nm, 510nm, 555nm, 610nm, 650nm, respectively, wherein 555nm is the reference wavelength for which the main visible light extraction technology is mainly performed.
The ratio of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power is 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 is NPR, the sum of the PPR of all the lenses with positive refractive power is Σ PPR, and the sum of the NPR of all the lenses with negative refractive power is Σ NPR, which helps to control the total refractive power and the total length of the optical imaging system when the following conditions are satisfied: 0.5 ≦ Σ PPR/| Σ NPR ≦ 15, preferably, the following condition may be satisfied: 1 ≦ Σ PPR/| Σ NPR | < 3.0.
The optical imaging system may further include an image sensor disposed on the infrared imaging surface. Half of the diagonal length of the effective sensing area of the image sensing device (i.e. the imaging height of the optical imaging system or the maximum image height) is HOI, and the distance from the object-side surface of the first lens to the infrared imaging surface on the optical axis is HOS, which satisfies the following conditions: HOS/HOI is less than or equal to 50; and HOS/f is more than or equal to 0.5 and less than or equal to 150. Preferably, the following conditions may be satisfied: HOS/HOI is more than or equal to 0.5 and less than or equal to 6; and HOS/f is more than or equal to 1 and less than or equal to 140. Therefore, the optical imaging system can be kept miniaturized and can be carried on light, thin and portable electronic products.
Additionally, the utility model discloses an among the optical imaging system, can set up an at least light ring according to the demand to reduce stray light, help promoting image quality.
The utility model discloses an among the optical imaging system, the diaphragm configuration can be leading light ring or put the light ring, and wherein leading light ring meaning light ring sets up between shot object and first lens promptly, and the middle light ring then shows that the light ring sets up between first lens and infrared light imaging surface. If the diaphragm is a front diaphragm, the exit pupil of the optical imaging system and the infrared imaging surface can generate longer distance to accommodate more optical elements, and the image receiving efficiency of the image sensing element can be increased; if the diaphragm is arranged in the middle, the wide-angle lens is beneficial to expanding the field angle of the system, so that the optical imaging system has the advantage of a wide-angle lens. The distance between the diaphragm and the infrared imaging surface is InS, which satisfies the following conditions: 0.2-1.1 of InS/HOS. This makes it possible to maintain both the miniaturization of the optical imaging system and the wide-angle characteristic.
The utility model discloses an among the optical imaging system, the distance between first lens element object side to sixth lens element image side is the InTL, and the thickness sum of all lens that have refractive power on the optical axis is sigma TP, and it satisfies the following condition: 0.1-0.9 of sigma TP/InTL. Therefore, the contrast of system imaging and the yield of lens manufacturing can be considered simultaneously, and a proper back focus is provided for accommodating other elements.
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 conditions: the | R1/R2 | is not less than 0.001 and not more than 25. Therefore, the first lens element has proper positive refractive power strength, and the spherical aberration is prevented from increasing and speeding up. Preferably, the following conditions may be satisfied: 0.01 ≦ R1/R2 ≦ 12.
The radius of curvature of the object-side surface of the sixth lens is R11, and the radius of curvature of the image-side surface of the sixth lens is R12, which satisfy the following conditions: -7< (R11-R12)/(R11+ R12) < 50. Therefore, astigmatism generated by the optical imaging system is favorably corrected.
The first lens and the second lens are separated by a distance IN12 on the optical axis, which satisfies the following condition: IN12/f is less than or equal to 60. Therefore, the chromatic aberration of the lens is improved to improve the performance of the lens.
The fifth lens and the sixth lens are spaced apart by a distance IN56 on the optical axis, which satisfies the following condition: IN56/f is less than or equal to 3.0, which is helpful to improve the chromatic aberration of the lens to improve the performance of the lens.
The thicknesses of the first lens and the second lens on the optical axis are TP1 and TP2 respectively, which satisfy the following conditions: (TP1+ IN12)/TP2 is more than or equal to 0.1 and less than or equal to 10. Therefore, the method helps to control the manufacturing sensitivity of the optical imaging system and improve the performance of the optical imaging system.
The thicknesses of the fifth lens and the sixth lens on the optical axis are TP5 and TP6, respectively, and the distance between the two lenses on the optical axis is IN56, which satisfies the following conditions: (TP6+ IN56)/TP5 is more than or equal to 0.1 and less than or equal to 15. Thereby, it is helpful to control the sensitivity of the optical imaging system and reduce the total 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 is not less than TP4/(IN34+ TP4+ IN45) < 1. Therefore, the optical fiber is beneficial to slightly correcting aberration generated in the process of incident light advancing layer by layer and reducing the total height of the system.
The utility model discloses an among the optical imaging system, the critical point C61 of sixth lens object side is HVT61 with the vertical distance of optical axis, the critical point C62 of sixth lens image side is HVT62 with the vertical distance of optical axis, the crossing to the critical point C61 position of sixth lens object side on the optical axis is SGC61 in the horizontal displacement distance of optical axis, the crossing to the critical point C62 position of sixth lens image side on the optical axis is SGC62 in the horizontal displacement distance of optical axis, can satisfy following condition: HVT61 is more than or equal to 0mm and less than or equal to 3 mm; 0mm < HVT62 is less than or equal to 6 mm; 0 is less than or equal to HVT61/HVT 62; 0mm | -SGC 61 | -is not less than 0.5 mm; 0mm < | SGC62 | is less than or equal to 2 mm; and 0 | SGC62 | l/(| SGC62 | TP6) is less than or equal to 0.9. Therefore, the aberration of the off-axis field can be effectively corrected.
The utility model discloses an optical imaging system its satisfies following condition: HVT62/HOI is more than or equal to 0.2 and less than or equal to 0.9. Preferably, the following conditions may be satisfied: HVT62/HOI is more than or equal to 0.3 and less than or equal to 0.8. Thereby, aberration correction of the peripheral field of view of the optical imaging system is facilitated.
The utility model discloses an optical imaging system its satisfies following condition: HVT62/HOS is more than or equal to 0 and less than or equal to 0.5. Preferably, the following conditions may be satisfied: HVT62/HOS is more than or equal to 0.2 and less than or equal to 0.45. Thereby, aberration correction of the peripheral field of view of the optical imaging system is facilitated.
The utility model discloses an among the optical imaging system, sixth lens object side is in the optical axis intersect to the sixth lens object side between the most recent optical axis of the point of inflection with the parallel horizontal displacement distance of optical axis with SGI611 representation, sixth lens image side is in the optical axis intersect to the sixth lens image side between the most recent optical axis of the point of inflection with the parallel horizontal displacement distance of optical axis with SGI621 representation, it satisfies the following condition: 0< SGI611/(SGI611+ TP6) ≦ 0.9; 0< SGI621/(SGI621+ TP6) ≦ 0.9. Preferably, the following conditions may be satisfied: SGI611/(SGI611+ TP6) is more than or equal to 0.1 and less than or equal to 0.6; SGI621/(SGI621+ TP6) is more than or equal to 0.1 and less than or equal to 0.6.
A horizontal displacement distance parallel to the optical axis between an intersection point of the object-side surface of the sixth lens on the optical axis and an inflection point of the object-side surface of the sixth lens second near the optical axis is represented by SGI612, and a horizontal displacement distance parallel to the optical axis between an intersection point of the image-side surface of the sixth lens on the optical axis and an inflection point of the image-side surface of the sixth lens second near the optical axis is represented by SGI622, which satisfies the following conditions: 0< SGI612/(SGI612+ TP6) ≦ 0.9; 0< SGI622/(SGI622+ TP6) ≦ 0.9. Preferably, the following conditions may be satisfied: SGI612/(SGI612+ TP6) is more than or equal to 0.1 and less than or equal to 0.6; SGI622/(SGI622+ TP6) is more than or equal to 0.1 and less than or equal to 0.6.
The vertical distance between the inflection point of the nearest optical axis of the object-side surface of the sixth lens and the optical axis is represented by HIF611, the vertical distance between the inflection point of the nearest optical axis of the image-side surface of the sixth lens and the optical axis is represented by HIF621, and the following conditions are satisfied: HIF611 | of 0.001mm ≦ 5 mm; HIF621 | ≦ HIF 0.001mm ≦ 5 mm. Preferably, the following conditions may be satisfied: HIF611 | of 0.1 mm. ltoreq.3.5 mm; 1.5mm ≦ HIF621 ≦ 3.5 mm.
The vertical distance between the second inflection point near the optical axis of the object-side surface of the sixth lens and the optical axis is represented by HIF612, and the vertical distance between the intersection point on the optical axis of the image-side surface of the sixth lens and the second inflection point near the optical axis and the optical axis is represented by HIF622, which satisfies the following conditions: 0.001mm < l > HIF612 l < l > 5 mm; 0.001mm ≦ HIF622 ≦ 5 mm. Preferably, the following conditions may be satisfied: 0.1mm < l HIF622 | < 3.5 mm; 0.1mm ≦ HIF612 | 3.5 mm.
The vertical distance between the third near-optical-axis inflection point of the object-side surface of the sixth lens and the optical axis is represented by HIF613, and the vertical distance between the optical axis and the third near-optical-axis inflection point of the image-side surface of the sixth lens on the optical axis is represented by HIF623, which satisfies the following conditions: 0.001mm < l-HIF 613 < l > 5 mm; 0.001 mm-623 mm less than or equal to 5 mm. Preferably, the following conditions may be satisfied: 0.1mm < cord HIF623 | < cord > 3.5 mm; 0.1 mm. ltoreq. HIF613 | of 3.5 mm.
The vertical distance between the fourth inflection point near the optical axis of the object-side surface of the sixth lens and the optical axis is represented by HIF614, and the vertical distance between the fourth inflection point near the optical axis and the optical axis from the intersection point on the optical axis of the image-side surface of the sixth lens to the image-side surface of the sixth lens is represented by HIF624, wherein the following conditions are satisfied: 0.001mm < l > HIF614 | < l > 5 mm; 0.001mm ≦ HIF624 ≦ 5 mm. Preferably, the following conditions may be satisfied: 0.1mm < l HIF624 l < 3.5 mm; 0.1mm ≦ HIF614 ≦ 3.5 mm.
The present invention provides an optical imaging system, which can be used to correct chromatic aberration of the optical imaging system by staggering the lenses with high and low dispersion coefficients.
The equation for the aspheric surface is:
z＝ch2/[1+[1-(k+1)c2h2]0.5]+A4h4+A6h6+A8h8+A10h10+A12h12+A14h14+A16h16+A18h18+A20h20+…(1)
where z is a position value referenced to a surface vertex at a position of height h in the optical axis direction, k is a cone coefficient, c is an inverse of a curvature radius, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 are high-order aspheric coefficients.
The utility model provides an among the optical imaging system, the material of lens can be plastic or glass. When the lens is made of plastic, the production cost and the weight can be effectively reduced. In addition, when the lens is made of glass, the thermal effect can be controlled and the design space for the refractive power configuration of the optical imaging system can be increased. In addition, the object side and the image side of first lens to sixth lens among the optical imaging system can be the aspheric surface, and it can obtain more control variable, except that being used for subducing the aberration, compare in the use of traditional glass lens and can reduce the number that the lens used even, consequently can effectively reduce the utility model discloses optical imaging system's overall height.
In addition, in the optical imaging system provided by the present invention, if the lens surface is a convex surface, the lens surface is a convex surface at the paraxial region in principle; if the lens surface is concave, it means in principle that the lens surface is concave at the paraxial region.
The utility model discloses an optical imaging system more visual demand is applied to in the optical system that removes and focus to have good aberration concurrently and revise and good imaging quality's characteristic, thereby enlarge the application aspect.
The utility model discloses a more visual demand of optical imaging system includes a drive module, and this drive module can be coupled with these some lenses and make these some lenses produce the displacement. The 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 further meet the demand that at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is a light filtering element with a wavelength less than 500nm, and can be manufactured by a material with a filtering short wavelength for at least one of the surface coating of the lens with the filtering function and the lens itself.
The utility model discloses an optical imaging system's infrared light imaging surface more visible demand selects to a plane or a curved surface. When the infrared imaging surface is a curved surface (e.g., a spherical surface with a radius of curvature), it is helpful to reduce the incident angle of the focused light on the infrared imaging surface, and besides, it is helpful to achieve the length (TTL) of the miniature optical imaging system, it is also helpful to improve the relative illumination.
The utility model discloses an optical imaging system can be applied to the acquisition of stereoscopic image, and the light that borrows by utensil specific characteristics throws to the object, receives and the operation analysis by the camera lens again after the object surface reflection to obtain the distance between each position of object and the camera lens, and then judge stereoscopic image's information. The projection light is mostly infrared rays of a specific wave band to reduce interference, and further more accurate measurement is achieved. The aforementioned 3D sensing method for capturing stereoscopic images can adopt time-of-flight (TOF) or structured light (structured light) technologies, but is not limited thereto.
The following provides a detailed description of the embodiments with reference to the accompanying drawings.
First embodiment
Referring to fig. 1, fig. 2 and fig. 3, wherein fig. 1 is a schematic diagram of an optical imaging system according to a first embodiment of the present invention, and fig. 2 is a graph sequentially showing a spherical aberration, an astigmatism and an optical distortion of the optical imaging system of the first embodiment from left to right. Fig. 3 is a lateral aberration diagram of the meridional plane fan and sagittal plane fan, the longest operating wavelength and the shortest operating wavelength of the optical imaging system of the first embodiment passing through the aperture edge at the 0.7 field. In fig. 1, the optical imaging system 10 includes, in order from an object side to an image side, a first lens element 110, an aperture stop 100, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, an ir-pass filter 180, an ir-image plane 190 and an image sensor 192.
The first lens element 110 with negative refractive power has a concave object-side surface 112 and a concave image-side surface 114, and is aspheric, and the object-side surface 112 has two inflection points. The profile curve length for the maximum effective radius of the object-side surface of the first lens is denoted as ARS11 and the profile curve length for the maximum effective radius of the image-side surface of the first lens is denoted as ARS 12. The contour curve length for the 1/2 entrance pupil diameter (HEP) of the object-side surface of the first lens is denoted as ARE11, and the contour curve length for the 1/2 entrance pupil diameter (HEP) of the image-side surface of the first lens is denoted as ARE 12. The first lens has a thickness TP1 on the optical axis.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the first lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the first lens is represented by SGI111, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the first lens on the optical axis and the inflection point of the nearest optical axis of the image-side surface of the first lens is represented by SGI121, which satisfies the following conditions: SGI111 ═ 0.0031 mm; | SGI111 |/(| SGI111 | + TP1) | 0.0016.
A horizontal displacement distance parallel to the optical axis between an intersection point of the object-side surface of the first lens on the optical axis and an inflection point of the object-side surface of the first lens second near the optical axis is represented by SGI112, and a horizontal displacement distance parallel to the optical axis between an intersection point of the image-side surface of the first lens on the optical axis and an inflection point of the image-side surface of the first lens second near the optical axis is represented by SGI122, which satisfies the following conditions: SGI 112-1.3178 mm; | SGI112 |/(| SGI112 | + TP1) | -0.4052.
The vertical distance between the inflection point of the nearest optical axis of the object-side surface of the first lens and the optical axis is represented by HIF111, and the vertical distance between the inflection point of the nearest optical axis of the image-side surface of the first lens and the optical axis is represented by HIF121, which satisfies the following conditions: HIF 111-0.5557 mm; HIF111/HOI is 0.1111.
The vertical distance between the second near-optic axis inflection point of the object-side surface of the first lens and the optical axis is denoted by HIF112, and the vertical distance between the second near-optic axis inflection point of the image-side surface of the first lens on the optical axis and the optical axis is denoted by HIF122, which satisfies the following conditions: HIF 112-5.3732 mm; HIF112/HOI 1.0746.
The second lens element 120 with positive refractive power has a convex object-side surface 122 and a convex image-side surface 124, and is aspheric, and the object-side surface 122 has a inflection point. The profile curve length for the maximum effective radius of the object-side surface of the second lens is denoted as ARS21 and the profile curve length for the maximum effective radius of the image-side surface of the second lens is denoted as ARS 22. The contour curve length for the 1/2 entrance pupil diameter (HEP) of the object-side surface of the second lens is denoted as ARE21, and the contour curve length for the 1/2 entrance pupil diameter (HEP) of the image-side surface of the second lens is denoted as ARE 22. The second lens has a thickness TP2 on the optical axis.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the second lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the second lens is represented by SGI211, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the second lens on the optical axis and the inflection point of the nearest optical axis of the image-side surface of the second lens is represented by SGI221, which satisfies the following conditions: SGI 211-0.1069 mm; | SGI211 |/(| SGI211 | + TP2) | -0.0412; SGI221 ═ 0 mm; | SGI221 |/(| SGI221 | + TP2) | 0.
The vertical distance between the inflection point of the nearest optical axis of the object-side surface of the second lens and the optical axis is represented by HIF211, the vertical distance between the inflection point of the nearest optical axis of the image-side surface of the second lens and the optical axis is represented by HIF221, and the following conditions are satisfied: HIF 211-1.1264 mm; HIF211/HOI 0.2253; HIF221 ═ 0 mm; HIF221/HOI is 0.
The third lens element 130 with negative refractive power has a concave object-side surface 132 and a convex image-side surface 134, and is aspheric, and the object-side surface 132 and the image-side surface 134 have inflection points. The maximum effective radius of the object-side surface of the third lens has a profile curve length represented by ARS31 and the maximum effective radius of the image-side surface of the third lens has a profile curve length represented by ARS 32. The contour curve length for the 1/2 entrance pupil diameter (HEP) of the object-side surface of the third lens is denoted as ARE31, and the contour curve length for the 1/2 entrance pupil diameter (HEP) of the image-side surface of the third lens is denoted as ARE 32. The third lens has a thickness TP3 on the optical axis.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the third lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the third lens is represented by SGI311, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the third lens on the optical axis and the inflection point of the nearest optical axis of the image-side surface of the third lens is represented by SGI321, which satisfies the following conditions: SGI 311-0.3041 mm; | SGI311 |/(| SGI311 | + TP3) | -0.4445; SGI 321-0.1172 mm; | SGI321 |/(| SGI321 | + TP3) | -0.2357.
The vertical distance between the inflection point of the nearest optical axis of the object-side surface of the third lens and the optical axis is represented by HIF311, the vertical distance between the inflection point of the nearest optical axis of the image-side surface of the third lens and the optical axis is represented by HIF321, and the following conditions are satisfied: HIF311 1.5907 mm; HIF311/HOI 0.3181; HIF 321-1.3380 mm; HIF321/HOI 0.2676.
The fourth lens element 140 with positive refractive power has a convex object-side surface 142 and a concave image-side surface 144, and is aspheric, wherein the object-side surface 142 has two inflection points and the image-side surface 144 has one inflection point. The profile curve length for the maximum effective radius of the object-side surface of the fourth lens is denoted as ARS41 and the profile curve length for the maximum effective radius of the image-side surface of the fourth lens is denoted as ARS 42. The contour curve length of the 1/2 entrance pupil diameter (HEP) of the object-side surface of the fourth lens is denoted as ARE41, and the contour curve length of the 1/2 entrance pupil diameter (HEP) of the image-side surface of the fourth lens is denoted as ARE 42. The thickness of the fourth lens on the optical axis is TP 4.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the fourth lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the fourth lens is represented by SGI411, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the fourth lens on the optical axis and the inflection point of the nearest optical axis of the image-side surface of the fourth lens is represented by SGI421, which satisfies the following conditions: SGI411 ═ 0.0070 mm; | SGI411 |/(| SGI411 | + TP4) | 0.0056; SGI421 ═ 0.0006 mm; | SGI421 |/(| SGI421 | + TP4) | 0.0005.
A horizontal displacement distance parallel to the optical axis between an intersection point of the object-side surface of the fourth lens on the optical axis and an inflection point of the object-side surface of the fourth lens second near the optical axis is represented by SGI412, and a horizontal displacement distance parallel to the optical axis between an intersection point of the image-side surface of the fourth lens on the optical axis and an inflection point of the image-side surface of the fourth lens second near the optical axis is represented by SGI422, which satisfies the following conditions: SGI412 ═ -0.2078 mm; | SGI412 |/(| SGI412 | + TP4) | -0.1439.
The vertical distance between the inflection point of the nearest optical axis of the object side surface of the fourth lens and the optical axis is represented by HIF411, the vertical distance between the inflection point of the nearest optical axis of the image side surface of the fourth lens and the optical axis from the intersection point of the image side surface of the fourth lens on the optical axis to the image side surface of the fourth lens is represented by HIF421, and the following conditions are satisfied: HIF411 mm 0.4706 mm; HIF411/HOI 0.0941; HIF421 of 0.1721 mm; HIF421/HOI ═ 0.0344.
The vertical distance between the second near-optical-axis inflection point of the object-side surface of the fourth lens and the optical axis is denoted by HIF412, and the vertical distance between the second near-optical-axis inflection point of the image-side surface of the fourth lens on the optical axis and the optical axis from the intersection point of the image-side surface of the fourth lens to the image-side surface of the fourth lens is denoted by HIF422, which satisfies the following conditions: HIF412 ═ 2.0421 mm; HIF412/HOI 0.4084.
The fifth lens element 150 with positive refractive power has a convex object-side surface 152 and a convex image-side surface 154, and is aspheric, wherein the object-side surface 152 has two inflection points and the image-side surface 154 has one inflection point. The maximum effective radius of the object-side surface of the fifth lens has a contour curve length represented by ARS51 and the maximum effective radius of the image-side surface of the fifth lens has a contour curve length represented by ARS 52. The contour curve length of the 1/2 entrance pupil diameter (HEP) of the object-side surface of the fifth lens is denoted as ARE51, and the contour curve length of the 1/2 entrance pupil diameter (HEP) of the image-side surface of the fifth lens is denoted as ARE 52. The thickness of the fifth lens on the optical axis is TP 5.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the fifth lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the fifth lens is represented by SGI511, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the fifth lens on the optical axis and the inflection point of the nearest optical axis of the image-side surface of the fifth lens is represented by SGI521, which satisfies the following conditions: SGI 511-0.00364 mm; | SGI511 |/(| SGI511 | + TP5) | 0.00338; SGI521 ═ 0.63365 mm; | SGI521 |/(| SGI521 | + TP5) | -0.37154.
A horizontal displacement distance parallel to the optical axis between an intersection point of the object-side surface of the fifth lens on the optical axis and an inflection point of the object-side surface of the fifth lens second near the optical axis is represented by SGI512, and a horizontal displacement distance parallel to the optical axis between an intersection point of the image-side surface of the fifth lens on the optical axis and an inflection point of the image-side surface of the fifth lens second near the optical axis is represented by SGI522, which satisfies the following conditions: SGI512 ═ 0.32032 mm; | SGI512 |/(| SGI512 | + TP5) | -0.23009.
A horizontal displacement distance parallel to the optical axis between an intersection point of the object-side surface of the fifth lens on the optical axis and an inflection point of the object-side surface of the fifth lens, which is third near the optical axis, is represented by SGI513, and a horizontal displacement distance parallel to the optical axis between an intersection point of the image-side surface of the fifth lens on the optical axis and an inflection point of the image-side surface of the fifth lens, which is third near the optical axis, is represented by SGI523, and satisfies the following conditions: SGI513 ═ 0 mm; | SGI513 |/(| SGI513 | + TP5) | 0; SGI523 ═ 0 mm; | SGI523 |/(| SGI523 | + TP5) | 0.
A horizontal displacement distance parallel to the optical axis between an intersection point of the object-side surface of the fifth lens on the optical axis and a fourth inflection point near the optical axis of the object-side surface of the fifth lens is represented by SGI514, and a horizontal displacement distance parallel to the optical axis between an intersection point of the image-side surface of the fifth lens on the optical axis and a fourth inflection point near the optical axis of the image-side surface of the fifth lens is represented by SGI524, which satisfies the following conditions: SGI514 ═ 0 mm; | SGI514 |/(| SGI514 | + TP5) | 0; SGI524 ═ 0 mm; | SGI524 |/(| SGI524 | + TP5) | 0.
The vertical distance between the inflection point of the nearest optical axis of the object side surface of the fifth lens and the optical axis is represented by HIF511, and the vertical distance between the inflection point of the nearest optical axis of the image side surface of the fifth lens and the optical axis is represented by HIF521, which satisfies the following conditions: HIF 511-0.28212 mm; HIF511/HOI 0.05642; HIF521 ═ 2.13850 mm; HIF521/HOI 0.42770.
The vertical distance between the second near-optic axis inflection point of the object-side surface of the fifth lens and the optical axis is HIF512, and the vertical distance between the second near-optic axis inflection point of the image-side surface of the fifth lens and the optical axis is HIF522, which satisfies the following conditions: HIF 512-2.51384 mm; HIF512/HOI 0.50277.
The vertical distance between the third near optical axis inflection point of the object side surface of the fifth lens and the optical axis is represented by HIF513, and the vertical distance between the third near optical axis inflection point of the image side surface of the fifth lens and the optical axis is represented by HIF523, which satisfies the following conditions: HIF513 ═ 0 mm; HIF513/HOI ═ 0; HIF523 ═ 0 mm; HIF523/HOI ═ 0.
The vertical distance between the fourth inflection point near the optical axis of the object-side surface of the fifth lens and the optical axis is denoted by HIF514, and the vertical distance between the fourth inflection point near the optical axis and the optical axis of the image-side surface of the fifth lens is denoted by HIF524, under the following conditions: HIF514 ═ 0 mm; HIF514/HOI ═ 0; HIF524 ═ 0 mm; HIF524/HOI ═ 0.
The sixth lens element 160 with negative refractive power has a concave object-side surface 162 and a concave image-side surface 164, wherein the object-side surface 162 has two inflection points and the image-side surface 164 has one inflection point. Therefore, the angle of each field of view incident on the sixth lens can be effectively adjusted to improve aberration. The maximum effective radius of the sixth lens object-side surface has a contour curve length represented by ARS61 and the maximum effective radius of the sixth lens image-side surface has a contour curve length represented by ARS 62. The contour curve length of the 1/2 entrance pupil diameter (HEP) of the object-side surface of the sixth lens is denoted as ARE61, and the contour curve length of the 1/2 entrance pupil diameter (HEP) of the image-side surface of the sixth lens is denoted as ARE 62. The thickness of the sixth lens on the optical axis is TP 6.
The horizontal displacement distance parallel to the optical axis between the intersection point of the object-side surface of the sixth lens on the optical axis and the inflection point of the nearest optical axis of the object-side surface of the sixth lens is represented by SGI611, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image-side surface of the sixth lens on the optical axis and the inflection point of the nearest optical axis of the image-side surface of the sixth lens is represented by SGI621, which satisfies the following conditions: SGI611 ═ 0.38558 mm; | SGI611 |/(| SGI611 | + TP6) | -0.27212; SGI 621-0.12386 mm; | SGI621 |/(| SGI621 | + TP6) | -0.10722.
A horizontal displacement distance parallel to the optical axis between an intersection point of the object-side surface of the sixth lens on the optical axis and an inflection point of the object-side surface of the sixth lens second near the optical axis is represented by SGI612, and a horizontal displacement distance parallel to the optical axis between an intersection point of the image-side surface of the sixth lens on the optical axis and an inflection point of the image-side surface of the sixth lens second near the optical axis is represented by SGI621, which satisfies the following conditions: SGI612 ═ -0.47400 mm; | SGI612 |/(| SGI612 | + TP6) | -0.31488; SGI622 ═ 0 mm; | SGI622 |/(| SGI622 | + TP6) | 0.
The vertical distance between the inflection point of the nearest optical axis of the object-side surface of the sixth lens and the optical axis is represented by HIF611, the vertical distance between the inflection point of the nearest optical axis of the image-side surface of the sixth lens and the optical axis is represented by HIF621, and the following conditions are satisfied: HIF611 ═ 2.24283 mm; HIF611/HOI 0.44857; HIF 621-1.07376 mm; HIF621/HOI 0.21475.
The vertical distance between the second near-optic axis inflection point of the object-side surface of the sixth lens and the optical axis is denoted by HIF612, and the vertical distance between the second near-optic axis inflection point of the image-side surface of the sixth lens and the optical axis is denoted by HIF622, which satisfy the following conditions: HIF612 ═ 2.48895 mm; HIF612/HOI 0.49779.
The vertical distance between the third near-optic axis inflection point of the object-side surface of the sixth lens and the optic axis is denoted by HIF613, and the vertical distance between the third near-optic axis inflection point of the image-side surface of the sixth lens and the optic axis is denoted by HIF623, which satisfy the following conditions: HIF613 ═ 0 mm; HIF613/HOI ═ 0; HIF623 ═ 0 mm; HIF623/HOI is 0.
The vertical distance between the fourth inflection point near the optical axis of the object-side surface of the sixth lens and the optical axis is HIF614, and the vertical distance between the fourth inflection point near the optical axis and the optical axis of the image-side surface of the sixth lens is HIF624, which satisfies the following conditions: HIF614 ═ 0 mm; HIF614/HOI ═ 0; HIF624 ═ 0 mm; HIF624/HOI ═ 0.
The infrared filter 180 is made of glass, and is disposed between the sixth lens element 160 and the infrared imaging plane 190 without affecting 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 half of the maximum viewing angle in the optical imaging system is HAF, and the numerical values thereof are as follows: f is 4.075 mm; f/HEP is 1.4; and HAF 50.000 degrees with tan (HAF) 1.1918.
In the optical imaging system of the present 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: f 1-7.828 mm; | f/f1 | -0.52060; f6 ═ 4.886; and | f1 | -f 6 |.
In the optical imaging system of the present 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 | + -f 3 | + f4 | + f5 | -95.50815 mm; | f1 | + -f 6 | -12.71352 mm and | -f 2 | + f3 | -f 4 | + | f5 | -f 1 | -f 6 |.
The ratio of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power is 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 is NPR, in the optical imaging system of this embodiment, the sum of the PPR of all the lenses with positive refractive power is Σ PPR ═ f/2 + f/f4+ f/f5 ═ 1.63290, the sum of the NPR of all the lenses with negative refractive power is Σ NPR ═ f/f1 +/f 3 ± + |/f/6 |, + |, 1.51305, and Σ PPR/| NPR | (1.07921). 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 the present embodiment, a distance between the object-side surface 112 of the first lens element and the image-side surface 164 of the sixth lens element is InTL, a distance between the object-side surface 112 of the first lens element and the infrared imaging surface 190 is HOS, a distance between the aperture stop 100 and the infrared imaging surface 190 is InS, a half of a diagonal length of an effective sensing area of the image sensor 192 is HOI, and a distance between the image-side surface 164 of the sixth lens element and the infrared imaging surface 190 is BFL, which satisfies the following conditions: instl + BFL ═ HOS; HOS 19.54120 mm; HOI 5.0 mm; HOS/HOI 3.90824; HOS/f 4.7952; 11.685mm for InS; and InS/HOS 0.59794.
In the optical imaging system of this embodiment, the sum of the thicknesses of all the lenses with refractive power on the optical axis is Σ TP, which satisfies the following condition: Σ TP is 8.13899 mm; and Σ TP/intil 0.52477. Therefore, the contrast of system imaging and the yield of lens manufacturing can be considered simultaneously, and a proper back focus is provided for accommodating other elements.
In the optical imaging system of the present embodiment, the radius of curvature of the object-side surface 112 of the first lens is R1, and the radius of curvature of the image-side surface 114 of the first lens is R2, which satisfy the following conditions: R1/R2 | -8.99987. Therefore, the first lens element has proper positive refractive power strength, and the spherical aberration is prevented from increasing and speeding up.
In the optical imaging system of the present embodiment, the curvature radius of the object-side surface 162 of the sixth lens is R11, and the curvature radius of the image-side surface 164 of the sixth lens is R12, which satisfies the following conditions: (R11-R12)/(R11+ R12) ═ 1.27780. Therefore, astigmatism generated by the optical imaging system is favorably corrected.
In the optical imaging system of this embodiment, the sum of the focal lengths of all the lenses with positive refractive power is Σ PP, which satisfies the following condition: f2+ f4+ f5 is 69.770 mm; and f5/(f2+ f4+ f5) ═ 0.067. Therefore, the positive refractive power of the single lens can be properly distributed to other positive lenses, so that the generation of remarkable aberration in the process of the incident light ray is inhibited.
In the optical imaging system of this embodiment, the sum of the focal lengths of all the lenses with negative refractive power is Σ NP, which satisfies the following condition: Σ NP ═ f1+ f3+ f6 ═ 38.451 mm; and f6/(f1+ f3+ f6) ═ 0.127. Therefore, the negative refractive power of the sixth lens element can be properly distributed to the other negative lens elements, so as to suppress the occurrence of significant aberration during the incident light beam traveling process.
IN the optical imaging system of the present embodiment, the distance between the first lens 110 and the second lens 120 on the optical axis is IN12, which satisfies the following condition: IN 12-6.418 mm; IN12/f 1.57491. Therefore, the chromatic aberration of the lens is improved to improve the performance of the lens.
IN the optical imaging system of the present embodiment, the distance between the fifth lens 150 and the sixth lens 160 on the optical axis is IN56, which satisfies the following condition: IN56 is 0.025 mm; IN56/f 0.00613. Therefore, the chromatic aberration of the lens is improved to improve the performance of the lens.
In the optical imaging system of the present 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: TP 1-1.934 mm; TP 2-2.486 mm; and (TP1+ IN12)/TP2 ═ 3.36005. Therefore, the method helps to control the manufacturing sensitivity of the optical imaging system and improve the performance of the optical imaging system.
IN the optical imaging system of the present embodiment, the thicknesses of the fifth lens 150 and the sixth lens 160 on the optical axis are TP5 and TP6, respectively, and the distance between the two lenses on the optical axis is IN56, which satisfies the following conditions: TP5 ═ 1.072 mm; TP6 ═ 1.031 mm; and (TP6+ IN56)/TP5 ═ 0.98555. Thereby, it is helpful to control the sensitivity of the optical imaging system and reduce the total height of the system.
IN the optical imaging system of the present embodiment, the distance between the third lens 130 and the fourth lens 140 on the optical axis is IN34, and the distance between the fourth lens 140 and the fifth lens 150 on the optical axis is IN45, which satisfies the following conditions: IN34 is 0.401 mm; IN45 is 0.025 mm; and TP4/(IN34+ TP4+ IN45) ═ 0.74376. Therefore, the aberration generated in the process of the incident light traveling is corrected in a layer-by-layer micro-amplitude mode, and the total height of the system is reduced.
In the optical imaging system of the present embodiment, a horizontal displacement distance between an intersection point of the fifth lens object-side surface 152 on the optical axis and a maximum effective radius position of the fifth lens object-side surface 152 on the optical axis is InRS51, a horizontal displacement distance between an intersection point of the fifth lens image-side surface 154 on the optical axis and a maximum effective radius position of the fifth lens image-side surface 154 on the optical axis is InRS52, and a thickness of the fifth lens 150 on the optical axis is TP5, which satisfies the following conditions: InRS 51-0.34789 mm; InRS 52-0.88185 mm; | InRS51 |/TP 5 ═ 0.32458 and | InRS52 |/TP 5 ═ 0.82276. Therefore, the manufacturing and molding of the lens are facilitated, and the miniaturization of the lens is effectively maintained.
In the optical imaging system of the present embodiment, a vertical distance between a critical point of the object-side surface 152 of the fifth lens element and the optical axis is HVT51, and a vertical distance between a critical point of the image-side surface 154 of the fifth lens element and the optical axis is HVT52, which satisfies the following conditions: HVT51 ═ 0.515349 mm; HVT 52-0 mm.
In the optical imaging system of the present embodiment, a horizontal displacement distance between an intersection point of the sixth lens object-side surface 162 on the optical axis and a maximum effective radius position of the sixth lens object-side surface 162 on the optical axis is InRS61, a horizontal displacement distance between an intersection point of the sixth lens image-side surface 164 on the optical axis and a maximum effective radius position of the sixth lens image-side surface 164 on the optical axis is InRS62, and a thickness of the sixth lens 160 on the optical axis is TP6, which satisfies the following conditions: InRS 61-0.58390 mm; InRS62 ═ 0.41976 mm; | InRS61 |/TP 6 ═ 0.56616 and | InRS62 |/TP 6 ═ 0.40700. Therefore, the manufacturing and molding of the lens are facilitated, and the miniaturization of the lens is effectively maintained.
In the optical imaging system of the present embodiment, a vertical distance between a critical point of the object-side surface 162 of the sixth lens element and the optical axis is HVT61, and a vertical distance between a critical point of the image-side surface 164 of the sixth lens element and the optical axis is HVT62, which satisfies the following conditions: HVT61 ═ 0 mm; HVT 62-0 mm.
In the optical imaging system of the present embodiment, it satisfies the following conditions: HVT51/HOI 0.1031. Thereby, aberration correction of the peripheral field of view of the optical imaging system is facilitated.
In the optical imaging system of the present embodiment, it satisfies the following conditions: HVT51/HOS 0.02634. Thereby, aberration correction of the peripheral field of view of the optical imaging system is facilitated.
In the optical imaging system of this embodiment, the third lens element and the sixth lens element have negative refractive power, the abbe number of the third lens element is NA3, and the abbe number of the sixth lens element is NA6, which satisfy the following conditions: NA6/NA3 is less than or equal to 1. Therefore, the correction of the chromatic aberration of the optical imaging system is facilitated.
In the optical imaging system of the present embodiment, the TV distortion of the optical imaging system during imaging is TDT, and the optical distortion during imaging is ODT, which satisfies the following conditions: TDT 2.124%; and the ODT is 5.076 percent.
In the optical imaging system of this embodiment, the lateral aberration of 0.7 field of view, which is incident on the infrared light imaging plane through the aperture edge, of the longest operating wavelength of visible light of the positive meridional fan diagram is represented by PLTA, which is 0.006mm, the lateral aberration of 0.7 field of view, which is incident on the infrared light imaging plane through the aperture edge, of the shortest operating wavelength of visible light of the positive meridional fan diagram is represented by PSTA, which is 0.005mm, the lateral aberration of 0.7 field of view, which is incident on the infrared light imaging plane through the aperture edge, of the shortest operating wavelength of visible light of the negative meridional fan diagram is represented by NLTA, which is 0.004mm, and the lateral aberration of 0.7 field of view, which is incident on the infrared light imaging plane through the aperture edge, of the shortest operating wavelength of visible light of the negative meridional fan diagram is represented by NSTA, which is. The lateral aberration of the longest visible operating wavelength of the sagittal plane fan diagram, which is incident on the infrared light imaging plane through the aperture edge, of 0.7 field of view is represented by SLTA, which is-0.003 mm, and the lateral aberration of the shortest visible operating wavelength of the sagittal plane fan diagram, which is incident on the infrared light imaging plane through the aperture edge, of 0.7 field of view is represented by SSTA, which is 0.008 mm.
The following list I and list II are referred to cooperatively.
TABLE II aspherical coefficients of the first example
According to the first and second tables, the following values related to the length of the profile curve can be obtained:
the first embodiment is a detailed structural data of the first embodiment, wherein the units of the radius of curvature, the thickness, the distance, and the focal length are mm, and the surfaces 0-16 sequentially represent the surfaces from the object side to the image side. Table II shows aspheric data of the first embodiment, where k represents the cone coefficients in the aspheric curve equation, and A1-A20 represents the aspheric coefficients of order 1-20 of each surface. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration graphs of the embodiments, and the definitions of the data in the tables are the same as those of the first and second tables of the first embodiment, which is not repeated herein.
Second embodiment
Referring to fig. 4, fig. 5 and fig. 6, wherein fig. 4 is a schematic view of an optical imaging system according to a second embodiment of the present invention, and fig. 5 is a graph sequentially showing a spherical aberration, an astigmatism and an optical distortion of the optical imaging system of the second embodiment from left to right. FIG. 6 is a lateral aberration diagram of the optical imaging system of the second embodiment at a 0.7 field of view. In fig. 4, the optical imaging system 20 includes, in order from an object side to an image side, an aperture stop 200, a first lens element 210, a second lens element 220, a third lens element 230, a fourth lens element 240, a fifth lens element 250, a sixth lens element 260, an ir-pass filter 280, an ir-imaging plane 290 and an image sensor 292.
The first lens element 210 with positive refractive power has a convex object-side surface 212 and a concave image-side surface 214, and is aspheric, wherein the object-side surface 212 has a inflection point and the image-side surface 214 has two inflection points.
The second lens element 220 with negative refractive power has a concave object-side surface 222 and a convex image-side surface 224, and is aspheric, and has an inflection point on an object-side surface 232 and two inflection points on an image-side surface 224.
The third lens element 230 with positive refractive power has a concave object-side surface 232 and a convex image-side surface 234, and is aspheric, and the object-side surface 232 and the image-side surface 234 have two inflection points.
The fourth lens element 240 with negative refractive power has a convex object-side surface 242 and a concave image-side surface 244, and is aspheric, and the object-side surface 242 and the image-side surface 244 both have inflection points.
The fifth lens element 250 with positive refractive power has a convex object-side surface 252 and a concave image-side surface 254, and is aspheric, wherein the object-side surface 252 has an inflection point and the image-side surface 254 has three inflection points.
The sixth lens element 260 with negative refractive power has a convex object-side surface 262 and a concave image-side surface 264, and is aspheric, wherein the object-side surface 262 has two inflection points and the image-side surface 264 has one inflection point. Thereby, the back focal length is advantageously shortened to maintain miniaturization. In addition, the angle of incidence of the light rays in the off-axis field can be effectively suppressed, and the aberration of the off-axis field can be further corrected.
The infrared filter 280 is made of glass, and is disposed between the sixth lens element 260 and the infrared imaging surface 290 without affecting the focal length of the optical imaging system.
Please refer to the following table three and table four.
TABLE IV aspheric coefficients of the second embodiment
In the second embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
According to the third table and the fourth table, the following conditional expressions can be obtained:
the values associated with the profile curve length can be obtained according to table three and table four:
the following values can be obtained according to table three and table four:
third embodiment
Referring to fig. 7, fig. 8 and fig. 9, wherein fig. 7 is a schematic view of an optical imaging system according to a third embodiment of the present invention, and fig. 8 is a graph sequentially showing a spherical aberration, an astigmatism and an optical distortion of the optical imaging system of the third embodiment from left to right. FIG. 9 is a lateral aberration diagram of the optical imaging system of the third embodiment at a 0.7 field of view. In fig. 7, the optical imaging system 30 includes, in order from an object side to an image side, a first lens element 310, a second lens element 320, an aperture stop 300, a third lens element 330, a fourth lens element 340, a fifth lens element 350, a sixth lens element 360, an ir-pass filter 380, an ir-imaging surface 390 and an image sensor 392.
The first lens element 310 with positive refractive power has a concave object-side surface 312 and a convex image-side surface 314, and is aspheric, and the object-side surface 312 and the image-side surface 314 have inflection points.
The second lens element 320 with negative refractive power has a concave object-side surface 322 and a convex image-side surface 324, and is aspheric, and the object-side surface 322 and the image-side surface 324 have inflection points.
The third lens element 330 with negative refractive power has a concave object-side surface 332 and a concave image-side surface 334, which are both aspheric, and has an inflection point on the object-side surface 332 and three inflection points on the image-side surface 334.
The fourth lens element 340 with positive refractive power has a convex object-side surface 342 and a concave image-side surface 344, and is aspheric, and the object-side surface 342 and the image-side surface 344 both have inflection points.
The fifth lens element 350 with positive refractive power has a convex object-side surface 352 and a convex image-side surface 354, and is aspheric, and the object-side surface 352 and the image-side surface 354 have two inflection points.
The sixth lens element 360 with negative refractive power has a concave object-side surface 362 and a concave image-side surface 364, and is aspheric, wherein the object-side surface 362 has two inflection points and the image-side surface 364 has one inflection point. Thereby, the back focal length is advantageously shortened to maintain miniaturization. In addition, the angle of incidence of the light rays in the off-axis field can be effectively suppressed, and the aberration of the off-axis field can be further corrected.
The infrared filter 380 is made of glass, and is disposed between the sixth lens element 360 and the infrared imaging surface 390 without affecting the focal length of the optical imaging system.
Please refer to table five and table six below.
TABLE sixth, aspherical coefficients of the third example
In the third embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
According to table five and table six, the following conditional values can be obtained:
according to table five and table six, the following values related to the profile curve length can be obtained:
according to table five and table six, the following conditional values can be obtained:
fourth embodiment
Referring to fig. 10, fig. 11 and fig. 12, wherein fig. 10 is a schematic view of an optical imaging system according to a fourth embodiment of the present invention, and fig. 11 is a graph sequentially showing a spherical aberration, an astigmatism and an optical distortion of the optical imaging system of the fourth embodiment from left to right. FIG. 12 is a lateral aberration diagram of the optical imaging system of the fourth embodiment at a 0.7 field of view. In fig. 10, the optical imaging system 40 includes, in order from an object side to an image side, a first lens element 410, an aperture stop 400, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450, a sixth lens element 460, an ir-pass filter 480, an ir-image plane 490, and an image sensor 492.
The first lens element 410 with negative refractive power has a concave object-side surface 412 and a convex image-side surface 414, and is aspheric, and the object-side surface 412 and the image-side surface 414 have an inflection point.
The second lens element 420 with positive refractive power has a convex object-side surface 422 and a convex image-side surface 424, and is aspheric, and the object-side surface 422 has a inflection point.
The third lens element 430 with negative refractive power has a concave object-side surface 432 and a convex image-side surface 434, and is aspheric, and the object-side surface 432 has two inflection points.
The fourth lens element 440 with positive refractive power has a convex object-side surface 442 and a concave image-side surface 444, and both the object-side surface 442 and the image-side surface 444 have inflection points.
The fifth lens element 450 with positive refractive power has a convex object-side surface 452 and a convex image-side surface 454, which are both aspheric, and the object-side surface 452 and the image-side surface 454 both have an inflection point.
The sixth lens element 460 with negative refractive power has a convex object-side surface 462 and a concave image-side surface 464, and is aspheric, wherein the object-side surface 462 has an inflection point and the image-side surface 464 has two inflection points. Thereby, the back focal length is advantageously shortened to maintain miniaturization. In addition, the angle of incidence of the light rays in the off-axis field can be effectively suppressed, and the aberration of the off-axis field can be further corrected.
The infrared filter 480 is made of glass, and is disposed between the sixth lens element 460 and the infrared imaging surface 490 without affecting the focal length of the optical imaging system.
Please refer to table seven and table eight below.
TABLE eighth, fourth example aspherical surface coefficients
In the fourth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
According to the seventh and eighth tables, the following conditional values can be obtained:
according to table seven and table eight, the following values related to the profile curve length can be obtained:
according to the seventh and eighth tables, the following conditional values can be obtained:
fifth embodiment
Referring to fig. 13, 14 and 15, fig. 13 is a schematic view of an optical imaging system according to a fifth embodiment of the present invention, and fig. 14 is a graph sequentially showing a spherical aberration, an astigmatism and an optical distortion of the optical imaging system of the fifth embodiment from left to right. Fig. 15 is a lateral aberration diagram of the optical imaging system of the fifth embodiment at a 0.7 field of view. In fig. 13, the optical imaging system 50 includes, in order from an object side to an image side, a first lens element 510, an aperture stop 500, a second lens element 520, a third lens element 530, a fourth lens element 540, a fifth lens element 550, a sixth lens element 560, an ir-pass filter 580, an ir-pass imaging surface 590, and an image sensor 592.
The first lens element 510 with negative refractive power has a convex object-side surface 512 and a concave image-side surface 514, and is aspheric, and the object-side surface 512 and the image-side surface 514 have an inflection point.
The second lens element 520 with negative refractive power has a concave object-side surface 522 and a convex image-side surface 524, and is aspheric, and the object-side surface 522 has an inflection point.
The third lens element 530 with positive refractive power has a convex object-side surface 532 and a concave image-side surface 534, and is aspheric, and the object-side surface 522 has two inflection points.
The fourth lens element 540 with negative refractive power has a convex object-side surface 542 and a concave image-side surface 544, and is aspheric, and the object-side surface 542 has two inflection points.
The fifth lens element 550 with positive refractive power has a convex object-side surface 552 and a convex image-side surface 554, and is aspheric, and the object-side surface 552 and the image-side surface 554 have a inflection point.
The sixth lens element 560 with negative refractive power has a concave object-side surface 562 and a convex image-side surface 564, and the object-side surface 562 has an inflection point and the image-side surface 564 has two inflection points. Thereby, the back focal length is advantageously shortened to maintain miniaturization. In addition, the angle of incidence of the light rays in the off-axis field can be effectively suppressed, and the aberration of the off-axis field can be corrected.
The infrared filter 580 is made of glass, and is disposed between the sixth lens element 560 and the infrared imaging plane 590 without affecting the focal length of the optical imaging system.
Please refer to table nine and table ten below.
Aspherical surface coefficients of Table ten and fifth example
In the fifth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
The following conditional values are obtained according to table nine and table ten:
from tables nine and ten, the following values associated with the profile curve length can be obtained:
the following conditional values are obtained according to table nine and table ten:
sixth embodiment
Referring to fig. 16 to 18, wherein fig. 16 is a schematic view of an optical imaging system according to a sixth embodiment of the present invention, and fig. 17 is a graph sequentially showing a spherical aberration, an astigmatism and an optical distortion of the optical imaging system of the sixth embodiment from left to right. Fig. 18 is a lateral aberration diagram of the optical imaging system of the sixth embodiment at a field of view of 0.7. In fig. 16, the optical imaging system 60 includes, in order from an object side to an image side, a first lens element 610, a second lens element 620, an aperture stop 600, a third lens element 630, a fourth lens element 640, a fifth lens element 650, a sixth lens element 660, an ir filter 680, an ir imaging surface 690, and an image sensor 692.
The first lens element 610 with negative refractive power has a concave object-side surface 612 and a convex image-side surface 614, and is aspheric, and both the object-side surface 612 and the image-side surface 614 have an inflection point.
The second lens element 620 with positive refractive power has a convex object-side surface 622 and a convex image-side surface 624, and is aspheric, wherein the object-side surface 622 has two inflection points and the image-side surface 624 has one inflection point.
The third lens element 630 with negative refractive power has a concave object-side surface 632, a convex image-side surface 634, and an aspheric surface, and the object-side surface 632 has an inflection point.
The fourth lens element 640 with positive refractive power has a convex object-side surface 642 and a concave image-side surface 644, which are both aspheric, and both the object-side surface 642 and the image-side surface 644 have inflection points.
The fifth lens element 650 with positive refractive power has a convex object-side surface 652 and a convex image-side surface 654, and is aspheric, wherein the object-side surface 652 has three inflection points and the image-side surface 654 has one inflection point.
The sixth lens element 660 with negative refractive power has a convex object-side surface 662 and a concave image-side surface 664, which are both aspheric, and has two inflection points on the object-side surface 662 and one inflection point on the image-side surface 664. Therefore, the back focal length of the lens is shortened to maintain miniaturization, the incident angle of the light of the off-axis field can be effectively suppressed, and the aberration of the off-axis field can be further corrected.
The infrared filter 680 is made of glass, and is disposed between the sixth lens element 660 and the infrared imaging plane 690 without affecting the focal length of the optical imaging system.
Please refer to the following table eleven and table twelve.
TABLE twelfth and sixth examples of aspherical surface coefficients
In the sixth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
The following conditional values were obtained according to table eleven and table twelve:
values associated with the profile curve length are obtained according to table eleven and table twelve:
the following conditional values were obtained according to table eleven and table twelve:
although the present invention has been described with reference to the above embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (25)
1. An optical imaging system, comprising, in order from an object side to an image side:
a first lens element with refractive power;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power;
a fifth lens element with refractive power;
a sixth lens element with refractive power; and
an infrared light imaging plane;
wherein the optical imaging system has six lenses with refractive power, at least one of the first lens element to the sixth lens element has positive refractive power, the focal length of the optical imaging system is f, the diameter of the entrance pupil of the optical imaging system is HEP, the diameter of the exit pupil of the image-side surface of the sixth lens element is HXP, half of the maximum viewing angle of the optical imaging system is HAF, the intersection point of any one surface of any one of the first lens element to the sixth lens element and the optical axis is the starting point, the end point is the contour curve length between the two points along the contour of the surface until the coordinate point on the surface at the vertical height from the optical axis 1/2HXP, and the following conditions ARE satisfied: f/HEP is more than or equal to 0.5 and less than or equal to 1.8; 0deg < HAF <50 deg and 0.9 < 2(ARE/HEP) < 2.0.
2. The optical imaging system of claim 1, wherein the infrared light has a wavelength between 700nm and 1300nm and the first spatial frequency is represented by SP1, satisfying the following condition: SP1 is less than or equal to 440 cycles/mm.
3. The optical imaging system of claim 1, wherein the infrared light has a wavelength between 850nm and 960nm and the first spatial frequency is represented by SP1, satisfying the following condition: SP1 is less than or equal to 220 cycles/mm.
4. The optical imaging system of claim 3 wherein the optical imaging system has a TV distortion at the time of imaging of TDT, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the infrared light imaging plane, the lateral aberration at 0.7HOI on the infrared light imaging plane passing through the entrance pupil edge and being incident on the infrared light imaging plane is represented by PLTA, the lateral aberration at 0.7HOI on the infrared light imaging plane passing through the shortest operating wavelength of the positive meridional light fan and being incident on the infrared light imaging plane is represented by PSTA, the lateral aberration at 0.7HOI on the infrared light imaging plane passing through the entrance pupil edge and being incident on the infrared light imaging plane is represented by NLTA, the lateral aberration at 0.7HOI on the infrared light imaging plane passing through the shortest operating wavelength of the negative meridional light fan is represented by NSTA, the lateral aberration of the sagittal plane light fan, which has the longest operating wavelength passing through the entrance pupil edge and is incident at 0.7HOI on the infrared light imaging plane, is denoted by SLTA, and the lateral aberration of the sagittal plane light fan, which has the shortest operating wavelength passing through the entrance pupil edge and is incident at 0.7HOI on the infrared light imaging plane, is denoted by SSTA, which satisfies the following conditions: the longest working wavelength is 960 nm; the shortest working wavelength is 850 nm; PLTA is less than or equal to 100 microns; PSTA not more than 100 microns; NLTA is less than or equal to 100 micrometers; NSTA is less than or equal to 100 microns; SLTA is less than or equal to 100 microns; and SSTA of less than or equal to 100 microns; TDT | is < 100%.
5. The optical imaging system according to claim 1, wherein a maximum effective radius of any one surface of any one of the first to sixth lenses is expressed by EHD, an intersection point of any one surface of any one of the first to sixth lenses with an optical axis is a starting point, a contour curve length between the two points is ARS, and the following formula is satisfied, along a contour of the surface up to a point of the maximum effective radius of the surface is an end point: 0.9-2.0 of ARS/EHD.
6. The optical imaging system according to claim 1, wherein a distance on an optical axis between the first lens and the second lens is IN12, and a distance on an optical axis between the third lens and the fourth lens is IN34, which satisfy the following conditions: IN12> IN 34.
7. The optical imaging system according to claim 1, wherein a distance on an optical axis between the fourth lens and the fifth lens is IN45, and a distance on an optical axis between the fifth lens and the sixth lens is IN56, which satisfy the following conditions: IN56> IN 45.
8. The optical imaging system according to claim 1, wherein a distance on an optical axis between the third lens and the fourth lens is IN34, and a distance on an optical axis between the fourth lens and the fifth lens is IN45, which satisfy the following conditions: IN45> IN 34.
9. The optical imaging system of claim 1, further comprising an aperture stop having a distance InS on an optical axis from the aperture stop to the infrared light imaging plane, the first lens object side having a distance HOS on the optical axis from the infrared light imaging plane, wherein the following formula is satisfied: 0.2-1.1 of InS/HOS.
10. An optical imaging system, comprising, in order from an object side to an image side:
a first lens element with refractive power;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power;
a fifth lens element with refractive power;
a sixth lens element with refractive power; and
an infrared light imaging plane;
wherein the optical imaging system has six lenses with refractive power, at least one surface of at least one of the first lens element to the sixth lens element has at least one inflection point, at least one of the first lens element to the sixth lens element has positive refractive power, the focal length of the optical imaging system is f, the diameter of the entrance pupil of the optical imaging system is HEP, the diameter of the exit pupil of the image side of the sixth lens element is HXP, half of the maximum viewing angle of the optical imaging system is HAF, the intersection point of any one of the first lens element to the sixth lens element and the optical axis is a starting point, the end point is a point along the contour of the surface up to a coordinate point on the surface at a vertical height from the optical axis 1/2HXP, the length of the contour curve between the two points is ARE, and the following conditions ARE satisfied: f/HEP is more than or equal to 0.5 and less than or equal to 1.5; 0deg < HAF ≤ 50 deg; and 0.9 is less than or equal to 2(ARE/HEP) is less than or equal to 2.0.
11. The optical imaging system according to claim 10, wherein a maximum effective radius of any one surface of any one of the first to sixth lenses is expressed by EHD, an intersection point of any one surface of any one of the first to sixth lenses with an optical axis is a starting point, a contour curve length between the two points is ARS, and the following formula is satisfied, along a contour of the surface up to a point of the maximum effective radius of the surface: 0.9-2.0 of ARS/EHD.
12. The optical imaging system of claim 10, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the infrared light imaging plane, and the first lens object side surface has a distance HOS on the optical axis to the infrared light imaging plane, which satisfies the following condition: HOS/HOI is more than or equal to 0.5 and less than or equal to 6.
13. The optical imaging system of claim 10, further comprising an aperture, the aperture being located before the image side surface of the third lens element.
14. The optical imaging system of claim 10, wherein the image-side surface of the second lens is convex on the optical axis.
15. The optical imaging system of claim 10, wherein the object side surface of the fifth lens is convex on the optical axis.
16. The optical imaging system of claim 10, wherein the object side surface of the fourth lens is convex on the optical axis and the image side surface is convex on the optical axis.
17. The optical imaging system of claim 10, wherein the image-side surface of the fourth lens is convex on the optical axis.
18. The optical imaging system of claim 10, characterized in that it satisfies the following condition: f/HEP is more than or equal to 0.5 and less than or equal to 1.4.
19. The optical imaging system of claim 10, wherein all of the first through sixth lenses are plastic.
20. An optical imaging system, comprising, in order from an object side to an image side:
a first lens element with refractive power;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power;
a fifth lens element with refractive power;
a sixth lens element with refractive power; and
an infrared light imaging plane;
wherein the optical imaging system has six lenses with refractive power, at least one surface of each of at least two lenses 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 image-side surface of the sixth lens is HXP, half of the maximum viewing angle of the optical imaging system is HAF, the intersection point of any surface of any lens of the first lens to the sixth lens and the optical axis is a starting point, the contour of the surface is an end point until a coordinate point on the surface at a vertical height from the optical axis 1/2HXP, the contour curve length between the two points is ARE AREs, and the following conditions ARE satisfied: f/HEP is more than or equal to 0.5 and less than or equal to 1.3; 0deg < HAF ≤ 45 deg; and 0.9 is less than or equal to 2(ARE/HEP) is less than or equal to 2.0.
21. The optical imaging system of claim 20, wherein the first lens object side surface has a distance HOS on the optical axis to the infrared light imaging surface, the optical imaging system satisfying the following equation: HOS is more than 0mm and less than or equal to 20 mm.
22. The optical imaging system of claim 20, wherein the infrared light has a wavelength between 850nm and 960nm and the first spatial frequency is represented by SP1, satisfying the following condition: SP1 is less than or equal to 220 cycles/mm.
23. The optical imaging system of claim 20, wherein the first lens element to the sixth lens element are made of plastic material.
24. The optical imaging system according to claim 20, wherein an optical-axis distance between the first lens and the second lens is IN12, an optical-axis distance between the second lens and the third lens is IN23, an optical-axis distance between the third lens and the fourth lens is IN34, an optical-axis distance between the fourth lens and the fifth lens is IN45, and an optical-axis distance between the fifth lens and the sixth lens is IN56, which satisfy the following conditions: IN12> IN 34; IN45> IN 34; and IN56> IN 45.
25. The optical imaging system of claim 20, further comprising an aperture stop, an image sensor disposed behind the infrared imaging plane and having at least 10 ten thousand pixels, and having a distance InS on an optical axis from the aperture stop to the infrared imaging plane, and a distance HOS on the optical axis from the object-side surface of the first lens element to the infrared imaging plane, satisfying the following formula: 0.2-1.1 of InS/HOS.
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| TW109200736U TWM593560U (en) | 2020-01-17 | 2020-01-17 | Optical image capturing system |
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| DE102020115494B3 (en) * | 2020-05-19 | 2021-04-22 | Jenoptik Optical Systems Gmbh | Lens, use of a lens, measuring system with a lens and use of a biaspheric plastic lens in a lens |
| TWI721888B (en) | 2020-05-20 | 2021-03-11 | 大立光電股份有限公司 | Imaging optical lens assembly, image capturing unit and electronic device |
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