TWM599917U - Optical image capturing system - Google Patents

Abstract

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

Description

Optical imaging system

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

In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has increased day by day. The photosensitive elements of general optical systems are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS Sensor). With the advancement of semiconductor process technology, The pixel size of the photosensitive element has been reduced, and the optical system has gradually developed into the field of high pixels, so the requirements for image quality are also increasing.

Traditional optical systems mounted on portable devices mostly use five or six-element lens structures. However, as portable devices continue to improve their pixels and end consumers’ demands for large apertures such as low light and night Shooting function, the conventional optical imaging system can no longer meet the higher-level photography requirements.

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

The aspect of this creative embodiment is aimed at an optical imaging system and an optical image capture lens that can utilize the refractive power of seven lenses, the combination of convex and concave surfaces (the convex or concave surface in this creation refers in principle to the object side of each lens Or the description of the geometric shape changes at different heights from the side to the optical axis), which can effectively increase the amount of light entering the optical imaging system and at the same time improve the imaging quality, so that it can be applied to small electronic products.

The terms and codes of the lens parameters related to this creative embodiment are listed below for reference in the subsequent description: lens parameters related to length or height

The maximum imaging height of the optical imaging system is represented by HOI; the height of the optical imaging system is represented by HOS; the distance between the object side of the first lens and the image side of the seventh lens of the optical imaging system is represented by InTL; the fixed aperture of the optical imaging system ( The distance between the aperture) and the imaging surface is represented by InS; the distance between the first lens and the second lens of the optical imaging system is represented by IN12 (example); the thickness of the first lens of the optical imaging system on the optical axis is represented by TP1 ( Exemplified).

Lens parameters related to material

The chromatic dispersion coefficient of the first lens of the optical imaging system is represented by NA1 (example); the refractive law of the first lens is represented by Nd1 (example).

Lens parameters related to viewing angle

The viewing angle is expressed in AF; half of the viewing angle is expressed in HAF; the chief ray angle is expressed in MRA.

Lens parameters related to the entrance and exit pupil

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

Parameters related to the arc length and surface profile of the lens

The length of the contour curve of the maximum effective radius of any surface of a single lens refers to the point of intersection of the surface of the lens and the optical axis of the optical imaging system as the starting point, from which the starting point is along the line of the lens The surface profile reaches the end of its maximum effective radius. The arc length of the curve between the aforementioned two points is the length of the contour curve of the maximum effective radius, and is expressed in ARS. For example, the length of the contour curve of the maximum effective radius of the object side of the first lens is represented by ARS11, and the length of the contour curve of the maximum effective radius of the image side of the first lens is represented by ARS12. The length of the contour curve of the maximum effective radius of the object side of the second lens is represented by ARS21, and the length of the contour curve of the maximum effective radius of the image side of the second lens is represented by ARS22. The length of the contour curve of the maximum effective radius of any surface of the remaining lenses in the optical imaging system can be deduced by analogy.

The length of the profile curve of 1/2 entrance pupil diameter (HEP) of any surface of a single lens means that the intersection of the surface of the lens and the optical axis of the optical imaging system is the starting point, and the starting point is along the The surface contour of the lens reaches the coordinate point of the vertical height from the optical axis 1/2 the diameter of the entrance pupil on the surface. The arc length of the curve between the aforementioned two points is the length of the contour curve of 1/2 entrance pupil diameter (HEP), and ARE said. For example, the length of the contour curve of 1/2 entrance pupil diameter (HEP) on the object side of the first lens is represented by ARE11, and the length of the contour curve of 1/2 entrance pupil diameter (HEP) on the image side of the first lens is represented by ARE12. The length of the contour curve of 1/2 entrance pupil diameter (HEP) on the object side of the second lens is represented by ARE21, and the length of the contour curve of 1/2 entrance pupil diameter (HEP) on the image side of the second lens is represented by ARE22. The length of the contour curve of 1/2 entrance pupil diameter (HEP) of any surface of the remaining lenses in the optical imaging system can be deduced by analogy.

Parameters related to the depth of the lens surface

The intersection of the object side surface of the seventh lens on the optical axis to the end of the maximum effective radius of the object side surface of the seventh lens, the distance between the aforementioned two points horizontal to the optical axis is represented by InRS71 (the maximum effective radius depth); the image side of the seventh lens From the point of intersection on the optical axis to the end of the maximum effective radius of the image side of the seventh lens, the distance between the aforementioned two points horizontal to the optical axis is represented by InRS72 (the maximum effective radius depth). The depth (sinkage) of the maximum effective radius of the object side or image side of other lenses is expressed in the same way as above.

Parameters related to lens surface

Critical point C refers to a point on the surface of a specific lens that is tangent to a tangent plane perpendicular to the optical axis, except for the point of intersection with the optical axis. Continuing, for example, the vertical distance between the critical point C51 on the object side of the fifth lens and the optical axis is HVT51 (example), the vertical distance between the critical point C52 of the fifth lens image side and the optical axis is HVT52 (example), the vertical distance between the critical point C61 of the sixth lens object side and the optical axis is HVT61 (example), and the sixth lens The vertical distance between the critical point C62 on the side of the mirror image and the optical axis is HVT62 (exemplified). For other lenses, such as the seventh lens, the critical point on the object side or the image side and the vertical distance from the optical axis are expressed in the same way as described above.

The inflection point closest to the optical axis on the object side of the seventh lens is IF711. The sinking amount of this point is SGI711 (example). SGI711 is the intersection point of the object side of the seventh lens on the optical axis to the nearest optical axis of the object side of the seventh lens. The horizontal displacement distance between the inflection points parallel to the optical axis, and the vertical distance between this point and the optical axis of IF711 is HIF711 (example). The inflection point closest to the optical axis on the image side of the seventh lens is IF721. The sinking amount of this point is SGI721 (example). SGI711 is the intersection of the image side of the seventh lens on the optical axis to the closest optical axis of the image side of the seventh lens. The horizontal displacement distance between the inflection points parallel to the optical axis, the vertical distance between this point and the optical axis of IF721 is HIF721 (example).

The second inflection point on the object side of the seventh lens that is close to the optical axis is IF712. The sinking amount of this point is SGI712 (example). SGI712 is the intersection of the object side of the seventh lens on the optical axis and the second closest to the object side of the seventh lens. The horizontal displacement distance between the inflection points of the optical axis parallel to the optical axis, and the vertical distance between this point of IF712 and the optical axis is HIF712 (example). The second inflection point on the image side of the seventh lens that is closest to the optical axis is IF722. The sinking amount of this point is SGI722 (example). SGI722 is the intersection of the image side of the seventh lens on the optical axis and the second closest to the image side of the seventh lens. The horizontal displacement distance between the inflection points of the optical axis parallel to the optical axis, and the vertical distance between this point of IF722 and the optical axis is HIF722 (example).

The third inflection point on the object side of the seventh lens that is close to the optical axis is IF713. The sinking amount of this point is SGI713 (example). SGI713 is the intersection point of the object side of the seventh lens on the optical axis to the third closest to the object side of the seventh lens. The horizontal displacement distance between the inflection point of the optical axis parallel to the optical axis, and the vertical distance between this point of IF713 and the optical axis is HIF713 (example). The third inflection point on the image side of the seventh lens that is close to the optical axis is IF723. The sinking amount of this point is SGI723 (example). SGI723 is the intersection point of the image side of the seventh lens on the optical axis and the third closest to the image side of the seventh lens. The horizontal displacement distance between the inflection points of the optical axis and the optical axis parallel to the optical axis. The vertical distance between the shafts is HIF723 (example).

The fourth inflection point on the object side of the seventh lens that is close to the optical axis is IF714. The sinking amount of this point is SGI714 (example). SGI714 is the intersection point of the object side of the seventh lens on the optical axis to the fourth closest to the object side of the seventh lens. The horizontal displacement distance between the inflection points of the optical axis parallel to the optical axis, and the vertical distance between this point of IF714 and the optical axis is HIF714 (example). The fourth inflection point on the image side of the seventh lens that is close to the optical axis is IF724. The sinking amount of this point is SGI724 (example). SGI724 is the intersection of the image side of the seventh lens on the optical axis to the fourth closest to the image side of the seventh lens. The horizontal displacement distance between the inflection points of the optical axis parallel to the optical axis, and the vertical distance between this point of IF724 and the optical axis is HIF724 (example).

The expression of the inflection point on the object side or the image side of the other lens and the vertical distance from the optical axis or the sinking amount of the lens is similar to the foregoing.

Variables related to aberrations

Optical distortion (Optical Distortion) of the optical imaging system is expressed in ODT; its TV distortion (TV Distortion) is expressed in TDT, and it can be further defined to describe the degree of aberration shift between 50% and 100% of the imaging field; spherical aberration shift The shift is expressed in DFS; the coma aberration shift is expressed in DFC.

The lateral aberration at the edge of the aperture is expressed as STA (STOP Transverse Aberration). To evaluate the performance of a specific optical imaging system, you can use the tangential fan or the sagittal fan to calculate the light transverse direction of any field of view. The aberrations, especially the lateral aberrations of the longest working wavelength (for example, the wavelength of 650 NM) and the shortest working wavelength (for example, the wavelength of 470 NM) passing through the edge of the aperture, are calculated separately as a criterion for excellent performance. The coordinate direction of the aforementioned meridian surface light fan can be further divided into a positive direction (upward ray) and a negative direction (downward ray). The lateral aberration of the longest working wavelength passing through the edge of the aperture is defined as the imaging position of the longest working wavelength incident on the imaging surface through the edge of the aperture on the specific field of view on the imaging surface, and the reference wavelength chief ray (for example, the wavelength is 555NM) on the imaging surface. The difference in the distance between the two positions of the imaging position of the field, the lateral aberration of the shortest working wavelength passing through the edge of the aperture, which is defined as the imaging position of the shortest working wavelength incident on the imaging surface through the edge of the aperture, and the chief ray of the reference wavelength Of the field of view on the imaging surface The distance difference between the two positions of the imaging position is excellent in evaluating the performance of the specific optical imaging system. The shortest and longest working wavelength can be used to incident on the imaging surface through the edge of the aperture. The lateral aberration of 0.7 field of view (ie 0.7 imaging height HOI) is less than 100 micrometers (μm) can be used as the verification method, and the shortest and longest working wavelengths can even be further used as the verification method when the shortest and longest operating wavelengths are incident on the imaging surface through the edge of the aperture. The lateral aberrations of the 0.7 field of view are all less than 80 micrometers (μm).

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

This creation provides an optical imaging system that can simultaneously focus on visible light and infrared (dual mode) and achieve a certain performance separately, and the seventh lens is provided with a reflex point on the object side or image side, which can effectively adjust the incidence of each field of view The angle of the seventh lens is corrected for optical distortion and TV distortion. In addition, the surface of the seventh lens can have better light path adjustment capabilities to improve imaging quality.

According to the present creation, an optical imaging system is provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an imaging surface in sequence from the object side to the image side. The first lens has refractive power. The focal lengths of the first lens to the seventh lens are f1, f2, f3, f4, f5, f6, f7, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging lens system is HEP, and the There is a distance HOS from the object side of a lens to the imaging mask, and the object side of the first lens The seventh lens image side has a distance InTL on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, and the optical imaging system has a maximum imaging height HOI on the imaging plane perpendicular to the optical axis. The intersection of any surface of any lens in these lenses with the optical axis is the starting point, and the contour of the surface is extended to the coordinate point on the surface at the vertical height of 1/2 the diameter of the entrance pupil from the optical axis. The length of the contour curve is ARE, which meets the following conditions: 1≦f/HEP≦10; and 0.9≦2(ARE/HEP)≦2.0.

According to this creation, another optical imaging system is provided, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an imaging surface from the object side to the image side. . The first lens has refractive power. The second lens has refractive power. The third lens has refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth lens has refractive power. The seventh lens has refractive power, and both the object side and the image side are aspherical. At least one surface of at least one of the first lens to the seventh lens has at least one inflection point, and the focal lengths of the first lens to the seventh lens are f1, f2, f3, f4, f5, f6, respectively , F7, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging lens system is HEP, there is a distance HOS from the object side of the first lens to the imaging mask, and the object side of the first lens to the seventh lens The mirror image side has a distance InTL on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, and the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface. Any of the lenses The intersection point between any surface of the lens and the optical axis is the starting point, and follow the contour of the surface to the coordinate point on the surface at the vertical height of 1/2 the diameter of the entrance pupil from the optical axis. The length of the contour curve between the aforementioned two points is ARE, which satisfies the following conditions: 1≦f/HEP≦10; 0.5≦HOS/HOI≦1.8 and 0.9≦2(ARE/HEP)≦2.0.

According to this creation, an optical imaging system is provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an imaging surface in sequence from the object side to the image side . There are seven lenses of the optical imaging system having refractive power, and at least one surface of at least two of the first lens to the seventh lens has at least one inflection point. The first lens has flexion Fold force. The second lens has refractive power. The third lens has refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth lens has refractive power. The seventh lens has refractive power. The focal lengths of the first lens to the seventh lens are f1, f2, f3, f4, f5, f6, f7, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging lens system is HEP, and the There is a distance HOS from the object side of a lens to the imaging mask, a distance InTL from the object side of the first lens to the image side of the seventh lens on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, the The intersection point of any surface of any lens in the lens with the optical axis is the starting point, and the contour of the surface is extended to the coordinate point on the surface at the vertical height of 1/2 the diameter of the entrance pupil from the optical axis. The length of the profile curve is ARE, which meets the following conditions: 1≦f/HEP≦10; 0.5≦HOS/HOI≦1.8 and 0.9≦2(ARE/HEP)≦2.0.

The length of the contour curve of any surface of a single lens within the maximum effective radius affects the surface's ability to correct aberrations and the optical path difference between rays of each field of view. The longer the contour curve length, the higher the ability to correct aberrations, but it also It will increase the difficulty of manufacturing, so it is necessary to control the contour curve length of any surface of a single lens within the maximum effective radius, especially the contour curve length (ARS) and the surface within the maximum effective radius of the surface The proportional relationship (ARS/TP) between the thickness (TP) of the lens on the optical axis. For example, the length of the contour curve of the maximum effective radius of the object side of the first lens is represented by ARS11, the thickness of the first lens on the optical axis is TP1, the ratio between the two is ARS11/TP1, and the maximum effective radius of the image side of the first lens is The length of the profile curve is represented by ARS12, and the ratio between it and TP1 is ARS12/TP1. The contour curve length of the maximum effective radius of the second lens object side is represented by ARS21, the thickness of the second lens on the optical axis is TP2, the ratio between the two is ARS21/TP2, the contour of the maximum effective radius of the second lens image side The curve length is represented by ARS22, and the ratio between it and TP2 is ARS22/TP2. The proportional relationship between the length of the contour curve of the maximum effective radius of any surface of the remaining lens in the optical imaging system and the thickness (TP) of the lens on the optical axis to which the surface belongs, and the expression method can be deduced by analogy.

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

When |f1|>|f7|, the total system height of the optical imaging system (HOS; Height of Optic System) can be appropriately shortened to achieve the purpose of miniaturization.

When |f2|+|f3|+|f4|+|f5|+|f6| and |f1|+|f7| meet the above conditions, at least one of the second to sixth lenses has a weak positive Refraction or weak negative reflex. The so-called weak refractive power means that the absolute value of the focal length of a particular lens is greater than 10. When at least one of the second lens to the sixth lens of the present invention has a weak positive refractive power, it can effectively share the positive refractive power of the first lens and avoid unnecessary aberrations from appearing prematurely. On the contrary, if the second lens to the first lens At least one of the six lenses has a weak negative refractive power, and the aberration of the correction system can be fine-tuned.

In addition, the seventh lens may have negative refractive power, and its image side surface may be concave. This helps to shorten the back focal length to maintain miniaturization. In addition, at least one surface of the seventh lens may have at least one reflection The inflection point can effectively suppress the incident angle of the off-axis field of view, and further correct the aberration of the off-axis field of view.

10, 20, 30, 40, 50, 60, 70, 80: optical imaging system

100, 200, 300, 400, 500, 600, 700, 800: aperture

110, 210, 310, 410, 510, 610, 710, 810: first lens

112, 212, 312, 412, 512, 612, 712, 812: Object side

114, 214, 314, 414, 514, 614, 714, 814: like side

120, 220, 320, 420, 520, 620, 720, 820: second lens

122, 222, 322, 422, 522, 622, 722, 822: Object side

124, 224, 324, 424, 524, 624, 724, 824: like side

130, 230, 330, 430, 530, 630, 730, 830: third lens

132, 232, 332, 432, 532, 632, 732, 832: Object side

134, 234, 334, 434, 534, 634, 734, 834: like side

140, 240, 340, 440, 540, 640, 740, 840: fourth lens

142, 242, 342, 442, 542, 642, 742, 842: Object side

144, 244, 344, 444, 544, 644, 744, 844: like side

150, 250, 350, 450, 550, 650, 750, 850: fifth lens

152, 252, 352, 452, 552, 652, 752, 852: Object side

154, 254, 354, 454, 554, 654, 754, 854: like side

160, 260, 360, 460, 560, 660, 760, 860: sixth lens

162, 262, 362, 462, 562, 662, 762, 862: Object side

164, 264, 364, 464, 564, 664, 764, 864: like side

170, 270, 370, 470, 570, 670, 770, 870: seventh lens

172, 272, 372, 472, 572, 672, 772, 872: Object side

174, 274, 374, 474, 574, 674, 774, 874: like side

180, 280, 380, 480, 580, 680, 780, 880: infrared filter

190, 290, 390, 490, 590, 690, 790, 890: imaging surface

192, 292, 392, 492, 592, 692, 792, 892: image sensor

f: focal length of optical imaging system

f1: focal length of the first lens

f2: the focal length of the second lens

f3: focal length of the third lens

f4: focal length of the fourth lens

f5: focal length of the fifth lens

f6: focal length of the sixth lens

f7: focal length of the seventh lens

f/HEP; Fno; F#: the aperture value of the optical imaging system

HAF: Half of the maximum viewing angle of the optical imaging system

NA1: Dispersion coefficient of the first lens

NA2, NA3, NA4, NA5, NA6, NA7: the dispersion coefficient of the second lens to the seventh lens

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

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

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

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

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

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

R13, R14: The curvature radius of the seventh lens on the object side and the image side

TP1: The thickness of the first lens on the optical axis

TP2, TP3, TP4, TP5, TP6, TP7: the thickness of the second to seventh lenses on the optical axis

Σ TP: The sum of the thickness of all refractive lenses

IN12: The distance between the first lens and the second lens on the optical axis

IN23: The separation distance between the second lens and the third lens on the optical axis

IN34: The distance between the third lens and the fourth lens on the optical axis

IN45: The separation distance between the fourth lens and the fifth lens on the optical axis

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

IN67: The distance between the sixth lens and the seventh lens on the optical axis

InRS71: The horizontal displacement distance from the intersection of the seventh lens object side on the optical axis to the maximum effective radius position of the seventh lens object side on the optical axis

IF711: The inflection point closest to the optical axis on the object side of the seventh lens

SGI711: The amount of subsidence at this point

HIF711: The vertical distance between the inflection point closest to the optical axis on the object side of the seventh lens and the optical axis

IF721: The inflection point closest to the optical axis on the image side of the seventh lens

SGI721: The amount of subsidence at this point

HIF721: The vertical distance between the inflection point closest to the optical axis on the image side of the seventh lens and the optical axis

IF712: The second inflection point close to the optical axis on the object side of the seventh lens

SGI712: The amount of subsidence at this point

HIF712: The vertical distance between the second inflection point on the object side of the seventh lens near the optical axis and the optical axis

IF722: The second inflection point closest to the optical axis on the image side of the seventh lens

SGI722: The amount of subsidence at this point

HIF722: The vertical distance between the second inflection point on the image side of the seventh lens and the optical axis

C71: The critical point of the seventh lens object side

C72: The critical point of the seventh lens image side

SGC71: The horizontal displacement distance between the critical point of the seventh lens object side and the optical axis

SGC72: The horizontal displacement distance between the critical point of the seventh lens image side and the optical axis

HVT71: The vertical distance between the critical point of the seventh lens and the optical axis

HVT72: The vertical distance between the critical point of the seventh lens image side and the optical axis

HOS: Total height of the system (the distance from the object side of the first lens to the imaging surface on the optical axis)

Dg: The diagonal length of the image sensor

InS: distance from aperture to imaging surface

InTL: the distance from the object side of the first lens to the image side of the seventh lens

InB: The distance from the seventh lens image side to the imaging surface

HOI: Half of the diagonal length of the effective sensing area of the image sensor (maximum image height)

TDT: TV distortion of the optical imaging system at the time of image formation (TV Distortion)

ODT: Optical Distortion of the Optical Imaging System during Image Setting (Optical Distortion)

The above and other features of this creation will be described in detail with reference to the accompanying drawings.

Figure 1A is a schematic diagram of the optical imaging system of the first embodiment of this creation; Figure 1B shows the spherical aberration, astigmatism, and optical distortion of the optical imaging system of the first embodiment of this creation in order from left to right Curve diagram; Figure 1C shows the meridian and sagittal surface fans of the optical imaging system of the optical imaging system of the first embodiment of the creation. The longest working wavelength and the shortest working wavelength pass through the edge of the aperture at the 0.7 field of view. Aberration diagram; Figure 2A is a schematic diagram showing the optical imaging system of the second embodiment of this creation; Figure 2B shows the spherical aberration and astigmatism of the optical imaging system of the second embodiment of this creation in order from left to right And the curve diagram of optical distortion; Figure 2C shows the meridian and sagittal surface fans of the optical imaging system of the second embodiment of the creation. The longest working wavelength and shortest working wavelength pass through the edge of the aperture in the horizontal direction of the 0.7 field of view. Aberration diagram; Figure 3A is a schematic diagram showing the optical imaging system of the third embodiment of this creation; Figure 3B shows the spherical aberration and astigmatism of the optical imaging system of the third embodiment of this creation in order from left to right And the curve diagram of optical distortion; Figure 3C shows the meridian and sagittal surface fans of the optical imaging system of the third embodiment of the creation. The longest working wavelength and shortest working wavelength pass through the edge of the aperture at the 0.7 field of view. Aberration diagram; Figure 4A is a schematic diagram showing the optical imaging system of the fourth embodiment of this creation; Figure 4B shows the spherical aberration, astigmatism, and optical distortion of the optical imaging system of the fourth embodiment of this creation in order from left to right; Figure 4C shows the optical imaging system of the fourth embodiment of this creation The transverse aberration diagram of the meridian surface fan and the sagittal surface fan, the longest operating wavelength and the shortest operating wavelength pass through the edge of the aperture at a field of view of 0.7; Figure 5A is a schematic diagram of the optical imaging system of the fifth embodiment of this creation; Figure 5B shows the spherical aberration, astigmatism and optical distortion of the optical imaging system of the fifth embodiment of this creation in order from left to right; Figure 5C shows the optical imaging system of the fifth embodiment of this creation The transverse aberration diagrams of the meridian surface fan and the sagittal surface fan, the longest operating wavelength and the shortest operating wavelength pass through the edge of the aperture at a field of view of 0.7; Figure 6A is a schematic diagram of the optical imaging system of the sixth embodiment of this creation; Figure 6B shows the spherical aberration, astigmatism, and optical distortion of the optical imaging system of the sixth embodiment of this creation in order from left to right; Figure 6C shows the optical imaging system of the sixth embodiment of this creation The transverse aberration diagram of the meridian surface fan and the sagittal surface fan, the longest working wavelength and the shortest working wavelength pass through the edge of the aperture at the 0.7 field of view.

An optical imaging system group comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an imaging surface with refractive power in sequence from the object side to the image side . The optical imaging system may further include an image sensing element, which is disposed on the imaging surface, and the imaging height approaches 3.91 mm in the following embodiments.

The optical imaging system can be designed with three working wavelengths, 486.1nm and 587.5 respectively nm, 656.2nm, of which 587.5nm is the main reference wavelength, which is the main reference wavelength for extracting technical features. The optical imaging system can also be designed with five working wavelengths, which are 470nm, 510nm, 555nm, 610nm, 650nm, of which 555nm is the main reference wavelength for the main extraction technical features.

The ratio of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power PPR, the ratio of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power NPR, all lenses with positive refractive power The sum of PPR is ΣPPR, and the sum of NPR of all negative refractive power lenses is ΣNPR. When the following conditions are met, it helps to control the total refractive power and total length of the optical imaging system: 0.5≦ΣPPR/｜ΣNPR｜≦15, better It can meet the following conditions: 1≦ΣPPR/|ΣNPR|≦3.0.

The optical imaging system may further include an image sensing element disposed on the imaging surface. The half of the diagonal length of the effective sensing area of the image sensor element (that is, the imaging height or maximum image height of the optical imaging system) is HOI, and the distance from the object side of the first lens to the imaging surface on the optical axis is HOS, which Meet the following conditions: HOS/HOI≦10; and 0.5≦HOS/f≦10. Preferably, the following conditions can be satisfied: 1≦HOS/HOI≦5; and 1≦HOS/f≦7. In this way, the miniaturization of the optical imaging system can be maintained to be mounted on thin and portable electronic products.

In addition, in the optical imaging system of this creation, at least one aperture can be set as required to reduce stray light and help improve image quality.

In the optical imaging system of this creation, the aperture configuration can be a front aperture or a middle aperture. The front aperture means that the aperture is set between the subject and the first lens, and the middle aperture means that the aperture is set between the first lens and the first lens. Between imaging surfaces. If the aperture is a front aperture, the exit pupil of the optical imaging system and the imaging surface can produce a longer distance to accommodate more optical elements, and can increase the efficiency of image sensing elements to receive images; if it is a central aperture, the system It helps to expand the field of view of the system, so that the optical imaging system has the advantage of a wide-angle lens. The distance from the aforementioned aperture to the image side surface of the sixth lens is InS, which satisfies the following condition: 0.2≦InS/HOS≦1.1. In this way, it is possible to maintain the miniaturization of the optical imaging system and the characteristics of a wide angle at the same time. Sex.

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

The radius of curvature of the object side of the first lens is R1, and the radius of curvature of the image side of the first lens is R2, which satisfies the following conditions: 0.001≦|R1/R2|≦20. In this way, the first lens has a proper positive refractive power strength to avoid excessive increase in spherical aberration. Preferably, the following conditions can be satisfied: 0.01≦|R1/R2|<10.

The radius of curvature of the object side of the seventh lens is R13, and the radius of curvature of the image side of the seventh lens is R14, which meets the following conditions: -7<(R11-R12)/(R11+R12)<50. This is beneficial to correct the astigmatism generated by the optical imaging system.

The distance between the first lens and the second lens on the optical axis is IN12, which satisfies the following condition: IN12/f≦3.0. This helps to improve the chromatic aberration of the lens to enhance its performance.

The distance between the sixth lens and the seventh lens on the optical axis is IN67, which satisfies the following condition: IN67/f≦0.8. This helps to improve the chromatic aberration of the lens to enhance its performance.

The thicknesses of the first lens and the second lens on the optical axis are respectively TP1 and TP2, which satisfy the following conditions: 0.1≦(TP1+IN12)/TP2≦10. This helps to control the sensitivity of the optical imaging system manufacturing and improve its performance.

The thickness of the sixth lens and the seventh lens on the optical axis are TP6 and TP7, respectively. The separation distance between the two lenses on the optical axis is IN67, which satisfies the following condition: 0.1≦(TP7+IN67)/TP6≦10. This helps to control the sensitivity of the optical imaging system manufacturing and reduce the overall height of the system.

The thickness of the third lens, the fourth lens, and the fifth lens on the optical axis are TP3, TP4, and TP5, respectively. The distance between the third lens and the fourth lens on the optical axis is IN34, and the fourth lens and the fifth lens are at The separation distance on the optical axis is IN45, and the distance from the object side of the first lens to the image side of the seventh lens is InTL, it meets the following conditions: 0.1≦TP4/(IN34+TP4+IN45)<1. In this way, it helps to slightly correct the aberrations caused by the incident light traveling process and reduce the overall height of the system.

In the optical imaging system of this creation, the vertical distance between the critical point C71 on the object side of the seventh lens and the optical axis is HVT71; the vertical distance between the critical point C72 on the image side of the seventh lens and the optical axis is HVT72; The horizontal displacement distance from the intersection on the optical axis to the critical point C71 on the optical axis is SGC71, and the horizontal displacement from the intersection of the seventh lens image side on the optical axis to the critical point C72 on the optical axis is SGC72, which can meet the following conditions ：0mm≦HVT71≦3mm; 0mm<HVT72≦6mm; 0≦HVT71/HVT72; 0mm≦｜SGC71｜≦0.5mm; 0mm<｜SGC72｜≦2mm; and 0<｜SGC72｜/(｜SGC72｜+TP7) ≦0.9. In this way, the aberration of the off-axis field of view can be effectively corrected.

The optical imaging system of this creation satisfies the following conditions: 0.2≦HVT72/HOI≦0.9. Preferably, the following conditions can be satisfied: 0.3≦HVT72/HOI≦0.8. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

The optical imaging system of this creation meets the following conditions: 0≦HVT72/HOS≦0.5. Preferably, the following condition can be satisfied: 0.2≦HVT72/HOS≦0.45. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

In the optical imaging system of this creation, the horizontal displacement distance parallel to the optical axis between the intersection of the object side of the seventh lens on the optical axis and the inflection point of the closest optical axis of the object side of the seventh lens is represented by SGI711, and the seventh lens image The horizontal displacement distance parallel to the optical axis from the intersection point of the side surface on the optical axis to the inflection point of the nearest optical axis of the seventh lens image side is expressed as SGI721, which satisfies the following conditions: 0<SGI711/(SGI711+TP7)≦0.9 ; 0<SGI721/(SGI721+TP7)≦0.9. Preferably, the following conditions can be satisfied: 0.1≦SGI711/(SGI711+TP7)≦0.6; 0.1≦SGI721/(SGI721+TP7)≦0.6.

The horizontal displacement distance parallel to the optical axis from the intersection of the object side of the seventh lens on the optical axis to the second inflection point on the object side of the seventh lens, which is close to the optical axis, is represented by SGI712. The image side of the seventh lens is on the optical axis. Horizontal displacement parallel to the optical axis from the intersection point to the second inflection point on the image side of the seventh lens, which is close to the optical axis The distance is represented by SGI722, which meets the following conditions: 0<SGI712/(SGI712+TP7)≦0.9; 0<SGI722/(SGI722+TP7)≦0.9. Preferably, the following conditions can be satisfied: 0.1≦SGI712/(SGI712+TP7)≦0.6; 0.1≦SGI722/(SGI722+TP7)≦0.6.

The vertical distance between the inflection point of the closest optical axis on the object side of the seventh lens and the optical axis is represented by HIF711. The intersection of the image side of the seventh lens on the optical axis to the inflection point of the closest optical axis on the image side of the seventh lens and the optical axis The vertical distance between the two is represented by HIF721, which meets the following conditions: 0.001mm≦｜HIF711｜≦5mm; 0.001mm≦｜HIF721｜≦5mm. Preferably, the following conditions can be satisfied: 0.1mm≦|HIF711|≦3.5mm; 1.5mm≦|HIF721|≦3.5mm.

The vertical distance between the reflex point of the seventh lens object side second close to the optical axis and the optical axis is represented by HIF712. The intersection of the image side of the seventh lens on the optical axis to the second recurve near the optical axis of the seventh lens image side The vertical distance between the point and the optical axis is represented by HIF722, which meets the following conditions: 0.001mm≦｜HIF712｜≦5mm; 0.001mm≦｜HIF722｜≦5mm. Preferably, the following conditions can be satisfied: 0.1mm≦|HIF722|≦3.5mm; 0.1mm≦|HIF712|≦3.5mm.

The vertical distance between the third point of inflection on the object side of the seventh lens near the optical axis and the optical axis is represented by HIF713. The intersection of the image side of the seventh lens on the optical axis to the third near the optical axis of the seventh lens. The vertical distance between the point and the optical axis is represented by HIF723, which meets the following conditions: 0.001mm≦｜HIF713｜≦5mm; 0.001mm≦｜HIF723｜≦5mm. Preferably, the following conditions can be satisfied: 0.1mm≦|HIF723|≦3.5mm; 0.1mm≦|HIF713|≦3.5mm.

The vertical distance between the inflection point of the fourth near the optical axis of the seventh lens on the object side and the optical axis is represented by HIF714. The intersection of the image side of the seventh lens on the optical axis to the fourth near the optical axis of the seventh lens. The vertical distance between the point and the optical axis is represented by HIF724, which meets the following conditions: 0.001mm≦｜HIF714｜≦5mm; 0.001mm≦｜HIF724｜≦5mm. Preferably, the following conditions can be satisfied: 0.1mm≦|HIF724|≦3.5mm; 0.1mm≦|HIF714|≦3.5mm.

An implementation of the optical imaging system of this creation can be achieved by having high dispersion coefficient and The lenses with low dispersion coefficient are arranged staggered to help correct the chromatic aberration of the optical imaging system.

The equation system of the above aspheric surface is: z=ch2/[1+[1(k+1)c2h2]0.5]+A4h4+A6h6+A8h8+A10h10+A12h12+A14h14+A16h16+A18h18+A20h20+... (1)

Among them, z is the position value referenced by the surface vertex at the height of h along the optical axis, k is the conical coefficient, c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16 , A18 and A20 are high-order aspheric coefficients.

In the optical imaging system provided by this creation, the material of the lens can be plastic or glass. When the lens material is plastic, the production cost and weight can be effectively reduced. In addition, when the lens material is 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 image side of the first lens to the seventh lens in the optical imaging system can be aspherical, which can obtain more control variables. In addition to reducing aberrations, compared to the use of traditional glass lenses, The number of lenses used can be reduced, so the total height of the optical imaging system of the creative can be effectively reduced.

Furthermore, in the optical imaging system provided by this creation, if the lens surface is convex, in principle it means that the lens surface is convex at the near optical axis; if the lens surface is concave, it means that the lens surface is in principle at the near optical axis. Concave.

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

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

The optical imaging system of this creation can also make at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens have a wavelength less than 500nm depending on the needs. The light filtering element can be achieved by coating at least one surface of the specific lens with filtering function or the lens itself is made of a material capable of filtering short wavelengths.

The imaging surface of the optical imaging system of this creation can be selected as a flat surface or a curved surface according to requirements. When the imaging surface is a curved surface (for example, a spherical surface with a radius of curvature), it helps to reduce the incident angle required to focus the light on the imaging surface. In addition to helping to achieve the length of the miniature optical imaging system (TTL), it also helps to improve the relative The illuminance also helps.

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

First embodiment

Please refer to Figures 1A and 1B. Figure 1A shows a schematic diagram of an optical imaging system according to the first embodiment of the present invention. Figure 1B shows the optical imaging system of the first embodiment in order from left to right. Graphs of spherical aberration, astigmatism and optical distortion. Fig. 1C is the transverse aberration diagram of the meridian surface fan and the sagittal surface fan of the optical imaging system of the first embodiment, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at the 0.7 field of view. It can be seen from Figure 1A that the optical imaging system includes a first lens 110, an aperture 100, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160 in sequence from the object side to the image side. And the seventh lens 170, the infrared filter 180, the imaging surface 190, and the image sensor 192.

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

The intersection of the object side of the first lens on the optical axis to the reflex of the closest optical axis of the object side of the first lens The horizontal displacement distance between the points parallel to the optical axis is represented by SGI111. The horizontal displacement distance between the intersection of the image side surface of the first lens on the optical axis and the inflection point of the closest optical axis of the image side surface of the first lens is parallel to the optical axis. SGI121 indicates that it meets the following conditions: SGI111=-0.1110mm; SGI121=2.7120mm; TP1=2.2761mm; |SGI111|/(|SGI111|+TP1)=0.0465;|SGI121|/(|SGI121|+TP1)= 0.5437.

The horizontal displacement distance parallel to the optical axis from the intersection of the object side of the first lens on the optical axis to the second inflection point close to the optical axis of the object side of the first lens is represented by SGI112. The horizontal displacement distance parallel to the optical axis from the intersection point to the second inflection point on the image side surface of the first lens that is parallel to the optical axis is represented by SGI122, which satisfies the following conditions: SGI112=0mm; SGI122=4.2315mm; |SGI112|/(| SGI112|+TP1)=0; |SGI122|/(|SGI122|+TP1)=0.6502.

The vertical distance between the reflex point of the closest optical axis on the object side of the first lens and the optical axis is represented by HIF111. The intersection of the image side of the first lens on the optical axis to the reflex point of the closest optical axis on the image side of the first lens and the optical axis The vertical distance between the two is represented by HIF121, which meets the following conditions: HIF111=12.8432mm; HIF111/HOI=1.7127; HIF121=7.1744mm; HIF121/HOI=0.9567.

The vertical distance between the inflection point of the second near the optical axis on the object side of the first lens and the optical axis is represented by HIF112. The intersection of the image side of the first lens on the optical axis to the second closest to the optical axis of the image side of the first lens The vertical distance between the curved point and the optical axis is represented by HIF122, which meets the following conditions: HIF112=0mm; HIF112/HOI=0; HIF122=9.8592mm; HIF122/HOI=1.3147.

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

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

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

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

The horizontal displacement distance parallel to the optical axis between the intersection of the object side of the third lens on the optical axis and the inflection point of the closest optical axis of the object side of the third lens is represented by SGI311, and the intersection of the image side of the third lens on the optical axis to The horizontal displacement distance between the closest inflection point of the optical axis of the third lens image side and the optical axis parallel to the optical axis is represented by SGI321.

The horizontal displacement distance parallel to the optical axis from the intersection of the object side of the third lens on the optical axis to the second inflection point on the object side of the third lens that is close to the optical axis is represented by SGI312. The horizontal displacement distance parallel to the optical axis from the intersection point to the second inflection point on the image side surface of the third lens that is parallel to the optical axis is represented by SGI322.

The vertical distance between the inflection point of the closest optical axis on the object side of the third lens and the optical axis is represented by HIF311. The intersection point of the image side of the third lens on the optical axis to the inflection point of the closest optical axis on the image side of the third lens and the optical axis The vertical distance between the two is represented by HIF321.

The vertical distance between the second near-to-optical axis reflex point of the third lens on the object side and the optical axis is represented by HIF312. The intersection of the third lens’s image side on the optical axis to the second near-to the third reflex on the image side of the third lens The vertical distance between the point and the optical axis is represented by HIF322.

The fourth lens 140 has a positive refractive power and is made of plastic material. Its object side surface 142 is convex, its image side surface 144 is convex, and both are aspherical, and its object side surface 142 has an inflection point. The contour curve length of the maximum effective radius of the object side surface of the fourth lens is represented by ARS41, and the contour curve length of the maximum effective radius of the image side surface of the fourth lens is represented by ARS42. The length of the contour curve of 1/2 entrance pupil diameter (HEP) on the object side of the fourth lens is represented by ARE41, and the length of the contour curve of 1/2 entrance pupil diameter (HEP) on the image side of the fourth lens is represented by ARE42. The thickness of the fourth lens on the optical axis is TP4.

The horizontal displacement distance parallel to the optical axis from the intersection of the object side of the fourth lens on the optical axis to the inflection point of the closest optical axis of the object side of the fourth lens is represented by SGI411, and the intersection of the image side of the fourth lens on the optical axis to The horizontal displacement distance parallel to the optical axis between the closest inflection point of the fourth lens image side surface and the optical axis is represented by SGI421, which meets the following conditions: SGI411=0.0018mm; |SGI411|/(|SGI411|+TP4)=0.0009.

The horizontal displacement distance parallel to the optical axis from the intersection of the object side of the fourth lens on the optical axis to the second inflection point on the object side of the fourth lens that is close to the optical axis is represented by SGI412. The image side of the fourth lens is on the optical axis. The horizontal displacement distance from the intersection point to the second inflection point on the image side surface of the fourth lens that is parallel to the optical axis and the optical axis is represented by SGI422.

The vertical distance between the inflection point of the closest optical axis of the fourth lens on the object side and the optical axis is represented by HIF411. The intersection of the image side of the fourth lens on the optical axis to the inflection point of the closest optical axis on the image side of the fourth lens and the optical axis The vertical distance between the two is represented by HIF421, which meets the following conditions: HIF411=0.7191mm; HIF411/HOI=0.0959.

The vertical distance between the inflection point of the second near the optical axis of the fourth lens on the object side and the optical axis is represented by HIF412. The intersection of the image side of the fourth lens on the optical axis to the second near the optical axis of the fourth lens The vertical distance between the inflection point and the optical axis is represented by HIF422.

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

The horizontal displacement distance parallel to the optical axis between the intersection of the object side surface of the fifth lens on the optical axis and the inflection point of the closest optical axis of the object side of the fifth lens is represented by SGI511, and the intersection point of the image side surface of the fifth lens on the optical axis to The horizontal displacement distance between the inflection point of the closest optical axis of the fifth lens image side and parallel to the optical axis is represented by SGI521, which meets the following conditions: SGI511=-0.1246mm; SGI521=-2.1477mm; |SGI511|/(|SGI511 |+TP5)=0.0284; |SGI521|/(|SGI521|+TP5)=0.3346.

The horizontal displacement distance parallel to the optical axis from the intersection point of the object side surface of the fifth lens on the optical axis to the second inflection point of the object side surface of the fifth lens that is parallel to the optical axis is represented by SGI512. The horizontal displacement distance parallel to the optical axis from the intersection point to the second inflection point on the image side surface of the fifth lens, which is parallel to the optical axis, is represented by SGI522.

The vertical distance between the reflex point of the closest optical axis on the object side of the fifth lens and the optical axis is represented by HIF511, and the vertical distance between the reflex point of the closest optical axis on the image side of the fifth lens and the optical axis is represented by HIF521, which meets the following conditions : HIF511=3.8179mm; HIF521=4.5480mm; HIF511/HOI=0.5091; HIF521/HOI=0.6065.

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

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

The horizontal displacement distance parallel to the optical axis between the intersection point of the sixth lens object side surface on the optical axis and the closest optical axis inflection point of the sixth lens object side surface is represented by SGI611, and the sixth lens image side surface intersection point on the optical axis to The horizontal displacement distance between the inflection point of the closest optical axis of the sixth lens image side and the optical axis parallel to the optical axis is represented by SGI621, which meets the following conditions: SGI611=0.3208mm; SGI621=0.5937mm; |SGI611|/(|SGI611|+ TP6)=0.5167; |SGI621|/(|SGI621|+TP6)=0.6643.

The vertical distance between the reflex point of the closest optical axis of the sixth lens on the object side and the optical axis is represented by HIF611, and the vertical distance between the reflex point of the closest optical axis on the image side of the sixth lens and the optical axis is represented by HIF621, which meets the following conditions : HIF611=1.9655mm; HIF621=2.0041mm; HIF611/HOI=0.2621; HIF621/HOI=0.2672.

The seventh lens 170 has a positive refractive power and is made of plastic material. Its object side surface 172 is a convex surface, and its image side surface 174 is a concave surface. This helps to shorten the back focal length to maintain miniaturization. In addition, both the object side surface 172 and the image side surface 174 have an inflection point. The length of the contour curve of the maximum effective radius on the object side of the seventh lens is represented by ARS71, and the length of the contour curve of the maximum effective radius on the image side of the seventh lens is represented by ARS72. The length of the contour curve of 1/2 entrance pupil diameter (HEP) on the object side of the seventh lens is represented by ARE71, and the length of the contour curve of 1/2 entrance pupil diameter (HEP) on the image side of the seventh lens is represented by ARE72. The thickness of the seventh lens on the optical axis is TP7.

The horizontal displacement distance parallel to the optical axis from the intersection of the object side of the seventh lens on the optical axis to the inflection point of the closest optical axis of the object side of the seventh lens is represented by SGI711, and the image side of the seventh lens is on the optical axis. The horizontal displacement distance parallel to the optical axis from the point of intersection to the inflection point of the closest optical axis on the image side of the seventh lens is represented by SGI721, which satisfies the following conditions: SGI711=0.5212mm; SGI721=0.5668mm; |SGI711|/(|SGI711 |+TP7)=0.3179; |SGI721|/(|SGI721|+TP7)=0.3364.

The vertical distance between the reflex point of the closest optical axis on the object side of the seventh lens and the optical axis is represented by HIF711, and the vertical distance between the reflex point of the closest optical axis on the image side of the seventh lens and the optical axis is represented by HIF721, which meets the following conditions : HIF711=1.6707mm; HIF721=1.8616mm; HIF711/HOI=0.2228; HIF721/HOI=0.2482.

The following description and related features of the inflection point in this embodiment are obtained based on the main reference wavelength of 555 nm.

The infrared filter 180 is made of glass, which is disposed between the seventh lens 170 and the imaging surface 190 and does not affect the focal length of the optical imaging system.

In the optical imaging system of this embodiment, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, half of the maximum viewing angle in the optical imaging system is HAF, and the value is as follows: f=4.3019mm; f/HEP =1.2; and HAF=59.9968 degrees and tan(HAF)=1.7318.

In the optical imaging system of this embodiment, the focal length of the first lens 110 is f1, and the focal length of the seventh lens 170 is f7, which meets the following conditions: f1=-14.5286mm; |f/f1|=0.2961; f7=8.2933; |f1|>f7; and |f1/f7|=1.7519.

In the optical imaging system of this embodiment, the focal lengths of the second lens 120 to the sixth lens 160 are f2, f3, f4, f5, f6, respectively, which satisfy the following conditions: |f2|+|f3|+|f4|+| f5｜+｜f6｜=144.7494; |f1｜+｜f7｜=22.8219 and |f2｜+｜f3｜+｜f4｜+｜f5｜+｜f6｜>｜f1｜+｜f7｜.

The ratio of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power PPR, the ratio of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power NPR, the optical imaging of this embodiment In the system, the sum of PPR of all lenses with positive refractive power is ΣPPR=f/f2+f/f4+f/f5+f/f7=1.7384, the sum of NPR of all lenses with negative refractive power is ΣNPR=f/f1+f/f3+f/f6=-0.9999, ΣPPR/｜ ΣNPR|=1.7386. At the same time, the following conditions are also met: |f/f2｜=0.1774; |f/f3｜=0.0443; |f/f4｜=0.4411; |f/f5｜=0.6012; |f/f6｜=0.6595;|f/f7 ｜=0.5187.

In the optical imaging system of this embodiment, the distance between the object side surface 112 of the first lens and the image side surface 174 of the seventh lens is InTL, the distance between the object side surface 112 of the first lens and the imaging surface 190 is HOS, and the aperture is 100 to the imaging surface 180. The distance between them is InS, the half of the diagonal length of the effective sensing area of the image sensor 192 is HOI, and the distance between the image side surface 174 of the seventh lens and the imaging surface 190 is BFL, which satisfies the following conditions: InTL+BFL=HOS ; HOS=26.9789mm; HOI=7.5mm; HOS/HOI=3.5977; HOS/f=6.2715; InS=12.4615mm; and InS/HOS=0.4619.

In the optical imaging system of this embodiment, the total thickness of all refractive lenses on the optical axis is ΣTP, which meets the following conditions: ΣTP=16.0446 mm; and ΣTP/InTL=0.6559. In this way, the contrast of the system imaging and the yield rate of lens manufacturing can be taken into account at the same time, and an appropriate back focus can be provided to accommodate other components.

In the optical imaging system of this embodiment, the curvature radius of the first lens object side 112 is R1, and the curvature radius of the first lens image side 114 is R2, which satisfies the following conditions: |R1/R2|=129.9952. In this way, the first lens has a proper positive refractive power strength to avoid excessive increase in spherical aberration.

In the optical imaging system of this embodiment, the curvature radius of the seventh lens object side surface 172 is R13, and the curvature radius of the seventh lens image side surface 174 is R14, which meets the following conditions: (R13-R14)/(R13+R14)= -0.0806. This is beneficial to correct the astigmatism generated by the optical imaging system.

In the optical imaging system of this embodiment, the total focal length of all lenses with positive refractive power is ΣPP, which satisfies the following conditions: ΣPP=f2+f4+f5+f7=49.4535mm; and f4/(f2+f4+f5+ f7)=0.1972. Thereby, it is helpful to appropriately distribute the positive refractive power of the fourth lens 140 to other positive lenses, so as to suppress the generation of significant aberrations in the progress of the incident light.

In the optical imaging system of this embodiment, the sum of the focal lengths of all lenses with negative refractive power is ΣNP, which meets the following conditions: ΣNP=f1+f3+f6=-118.1178mm; and f1/(f1+f3+f6)= 0.1677. This helps to appropriately distribute the negative refractive power of the first lens to other negative lenses, so as to suppress the generation of significant aberrations in the process of the incident light rays.

In the optical imaging system of this embodiment, the separation distance between the first lens 110 and the second lens 120 on the optical axis is IN12, which meets the following conditions: IN12=4.5524mm; IN12/f=1.0582. This helps to improve the chromatic aberration of the lens to enhance its performance.

In the optical imaging system of this embodiment, the thicknesses of the first lens 110 and the second lens 120 on the optical axis are respectively TP1 and TP2, which satisfy the following conditions: TP1=2.2761mm; TP2=0.2398mm; and (TP1+IN12 )/TP2=1.3032. This helps to control the sensitivity of the optical imaging system manufacturing and improve its performance.

In the optical imaging system of this embodiment, the thickness of the sixth lens 160 and the seventh lens 170 on the optical axis are TP6 and TP7, respectively, and the separation distance between the two lenses on the optical axis is IN67, which meets the following conditions: TP6= 0.3000mm; TP7=1.1182mm; and (TP7+IN67)/TP6=4.4322. This helps to control the sensitivity of the optical imaging system manufacturing and reduce the overall height of the system.

In the optical imaging system of this embodiment, the thicknesses of the third lens 130, the fourth lens 140, and the fifth lens 150 on the optical axis are TP3, TP4, and TP5, respectively, and the third lens 130 and the fourth lens 140 are on the optical axis. The separation distance between the fourth lens 140 and the fifth lens 150 on the optical axis is IN45, the distance between the object side 112 of the first lens and the image side 174 of the seventh lens is InTL, which meets the following conditions: TP3 =0.8369mm; TP4=2.0022mm; TP5=4.2706mm; IN34=1.9268mm; IN45=1.5153mm; and TP4/(IN34+TP4+IN45)=0.3678. In this way, it helps to slightly correct the aberrations caused by the incident light traveling process and reduce the overall height of the system.

In the optical imaging system of this embodiment, the horizontal displacement distance from the intersection of the sixth lens object side surface 162 on the optical axis to the maximum effective radius position of the sixth lens object side surface 162 on the optical axis is InRS61, The horizontal displacement distance from the intersection of the lens image side surface 164 on the optical axis to the maximum effective radius position of the sixth lens image side surface 164 on the optical axis is InRS62, and the thickness of the sixth lens 160 on the optical axis is TP6, which meets the following conditions: InRS61=-0.7823mm; InRS62=-0.2166mm; and |InRS62|/TP6=0.722. This facilitates the manufacture and molding of the lens, and effectively maintains its miniaturization.

In the optical imaging system of this embodiment, the vertical distance between the critical point of the sixth lens object side surface 162 and the optical axis is HVT61, and the vertical distance between the critical point of the sixth lens image side surface 164 and the optical axis is HVT62, which meets the following conditions: HVT61=3.3498mm; HVT62=3.9860mm; and HVT61/HVT62=0.8404.

In the optical imaging system of this embodiment, the horizontal displacement distance from the intersection of the seventh lens object side surface 172 on the optical axis to the maximum effective radius position of the seventh lens object side surface 172 to the optical axis is InRS71, and the seventh lens image side surface 174 is at The horizontal displacement distance from the intersection on the optical axis to the maximum effective radius position of the image side surface 174 of the seventh lens on the optical axis is InRS72. The thickness of the seventh lens 170 on the optical axis is TP7, which meets the following conditions: InRS71=-0.2756mm ; InRS72=-0.0938mm; and |InRS72|/TP7=0.0839. This facilitates the manufacture and molding of the lens, and effectively maintains its miniaturization.

In the optical imaging system of this embodiment, the vertical distance between the critical point of the seventh lens object side surface 172 and the optical axis is HVT71, and the vertical distance between the critical point of the seventh lens image side surface 174 and the optical axis is HVT72, which meets the following conditions: HVT71=3.6822mm; HVT72=4.0606mm; and HVT71/HVT72=0.9068. In this way, the aberration of the off-axis field of view can be effectively corrected.

In the optical imaging system of this embodiment, it satisfies the following condition: HVT72/HOI=0.5414. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

In the optical imaging system of this embodiment, it satisfies the following condition: HVT72/HOS=0.1505. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

In the optical imaging system of this embodiment, the second lens, the third lens, and the seventh lens have negative refractive power, the dispersion coefficient of the second lens is NA2, the dispersion coefficient of the third lens is NA3, and the seventh lens has negative refractive power. The dispersion coefficient of the mirror is NA7, which satisfies the following conditions: 1≦NA7/NA2. This helps correct the chromatic aberration of the optical imaging system.

In the optical imaging system of this embodiment, the TV distortion of the optical imaging system is TDT when the image is set, and the optical distortion when the image is set is ODT, which meets the following conditions: |TDT|=2.5678%; |ODT|=2.1302%.

In the optical imaging system of this embodiment, the shortest working wavelength of visible light of the forward meridian light fan image is incident on the imaging surface through the edge of the aperture. The lateral aberration of 0.7 field of view is expressed in PSTA, which is 0.00040mm, and the forward meridian light The longest working wavelength of visible light in the fan image is incident on the imaging surface through the edge of the aperture. The lateral aberration of 0.7 field of view is expressed in PLTA, which is -0.009mm. The shortest working wavelength of visible light in the negative meridian fan image is incident on the image through the edge of the aperture. The lateral aberration of the 0.7 field of view on the surface is expressed in NSTA, which is -0.002mm. The longest working wavelength of visible light in the negative meridian fan image is incident on the imaging surface through the edge of the aperture. The lateral aberration of the 0.7 field of view is expressed in NLTA. It is -0.016mm. The shortest working wavelength of visible light in the sagittal plane fan diagram is incident on the imaging surface through the edge of the aperture. The lateral aberration of 0.7 field of view is expressed in SSTA, which is 0.018mm. The longest working wavelength of visible light in the sagittal plane fan diagram is incident on the imaging surface through the edge of the aperture. The lateral aberration of 0.7 field of view on the surface is represented by SLTA, which is 0.016 mm.

Refer to Table 1 and Table 2 below for cooperation.

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

Table 1 is the detailed structural data of the first embodiment in Figure 1, where the unit of curvature radius, thickness, distance and focal length is mm, and surface 0-16 indicates the surface from the object side to the image side in sequence. Table 2 is the aspheric surface data in the first embodiment, where k represents the conical surface coefficient in the aspheric curve equation, and A1-A20 represent the 1-20th order aspheric surface coefficients of each surface. In addition, the following embodiment tables correspond to the schematic diagrams and aberration curve diagrams of the respective embodiments, and the definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment, and will not be repeated here.

Second embodiment

Please refer to Figures 2A and 2B. Figure 2A shows a schematic diagram of an optical imaging system according to the second embodiment of the present invention. Figure 2B shows the optical imaging system of the second embodiment in order from left to right. Graphs of spherical aberration, astigmatism and optical distortion. Figure 2C is a lateral aberration diagram of the optical imaging system of the second embodiment at a field of view of 0.7. It can be seen from Figure 2A that the optical imaging system from the object side to the image side sequentially includes the aperture 200, the first lens 210, the second lens 220, the third lens 230, the fourth lens 240, the fifth lens 250, and the sixth lens 260. And the seventh lens 270, the infrared filter 280, the imaging surface 290, and the image sensor 292.

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

The second lens 220 has a negative refractive power and is made of plastic material. The object side surface 222 is convex, the image side surface 224 is concave, and both are aspherical. Both the object side surface 222 and the image side surface 224 have an inflection point.

The third lens 230 has a positive refractive power and is made of plastic material, and its object side surface 232 is a convex surface. The image side surface 234 is concave and all aspherical, and the object side surface 232 has an inflection point.

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

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

The sixth lens element 260 has a positive refractive power and is made of plastic. Its object side surface 262 is concave, its image side surface 264 is convex, and both are aspherical, and its object side surface 262 and image side surface 264 both have two inflection points. In this way, the angle of each field of view incident on the sixth lens 260 can be effectively adjusted to improve aberrations.

The seventh lens 270 has a negative refractive power and is made of plastic. Its object side surface 272 is a convex surface, and its image side surface 274 is a concave surface. This helps to shorten the back focal length to maintain miniaturization. In addition, both the object side surface 272 and the image side surface 274 of the seventh lens have an inflection point, which can effectively suppress the incident angle of the off-axis view field, and further correct the aberration of the off-axis view field.

The infrared filter 280 is made of glass, which is disposed between the seventh lens 270 and the imaging surface 290 and does not affect the focal length of the optical imaging system.

Please refer to Table 3 and Table 4 below for cooperation.

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

According to Table 3 and Table 4, the following conditional values can be obtained:

According to Table 3 and Table 4, the following conditional values can be obtained: According to Table 1 and Table 2, the following values related to the length of the contour curve can be obtained:

According to Table 3 and Table 4, the following conditional values can be obtained:

The third embodiment

Please refer to Figures 3A and 3B. Figure 3A shows a schematic diagram of an optical imaging system according to the third embodiment of the present invention. Figure 3B shows the optical imaging system of the third embodiment in order from left to right. Graphs of spherical aberration, astigmatism and optical distortion. Figure 3C is a lateral aberration diagram of the optical imaging system of the third embodiment at a field of view of 0.7. It can be seen from Fig. 3A that the optical imaging system includes an aperture 300, a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, and a fifth lens 350 in sequence from the object side to the image side. The sixth lens 360 and the seventh lens 370, the infrared filter 380, the imaging surface 390 and the image sensor 392.

The first lens 310 has a positive refractive power and is made of glass. Its object side surface 312 is a convex surface, and its image side surface 314 is a concave surface, and both are aspherical.

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

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

The fourth lens 340 has a negative refractive power and is made of plastic. Its object side surface 342 is convex, and its image side surface 344 is concave, and both are aspherical. Both the object side surface 342 and the image side surface 344 have two inflection points.

The fifth lens 350 has a positive refractive power and is made of plastic. Its object side surface 352 is concave, its image side surface 354 is convex, and both are aspherical, and its object side surface 352 has an inflection point.

The sixth lens 360 has a positive refractive power and is made of plastic material. Its object side surface 362 is a concave surface, its image side surface 364 is a convex surface, and both are aspherical, and its image side surface 364 has two inflection points. Thereby, the angle at which each field of view is incident on the sixth lens 360 can be effectively adjusted to improve aberrations.

The seventh lens 370 has a negative refractive power and is made of plastic. Its object side 372 is convex, and its image side 374 is concave, and both are aspherical. This helps to shorten the back focal length to maintain miniaturization.

In addition, both the object side surface 372 and the image side surface 374 have an inflection point, which can effectively suppress the incident angle of the off-axis view field, and further correct the aberration of the off-axis view field.

The infrared filter 380 is made of glass, which is disposed between the seventh lens 370 and the imaging surface 390 and does not affect the focal length of the optical imaging system.

Please refer to Table 5 and Table 6 below for cooperation.

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

According to Table 5 and Table 6, the following conditional values can be obtained:

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

According to Table 5 and Table 6, the following conditional values can be obtained:

Fourth embodiment

Please refer to Figures 4A and 4B. Figure 4A shows a schematic diagram of an optical imaging system according to the fourth embodiment of the present invention. Figure 4B shows the optical imaging system of the fourth embodiment in order from left to right. Graphs of spherical aberration, astigmatism and optical distortion. Figure 4C is a lateral aberration diagram of the optical imaging system of the fourth embodiment at a field of view of 0.7. It can be seen from FIG. 4A that the optical imaging system includes an aperture 400, a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, and a sixth lens 460 in order from the object side to the image side. And the seventh lens 470, the infrared filter 480, the imaging surface 490 and the image sensor 492.

The first lens 410 has a positive refractive power and is made of glass. Its object side surface 412 is convex, its image side surface 414 is convex, and both are aspherical. Its object side surface 412 has an inflection point and the image side surface 414 has two reverses. Curve point.

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

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

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

The fifth lens 450 has a negative refractive power and is made of plastic material. Its object side surface 452 is concave, and its image side surface 454 is convex, and both are aspherical. Both the object side surface 452 and the image side surface 4524 have an inflection point.

The sixth lens 460 has a positive refractive power and is made of plastic. Its object side surface 462 is convex, its image side surface 464 is convex, and both are aspherical. Its object side surface 462 has a point of inflection and the image side surface 464 has two reverses. Curve point. Thereby, the angle at which each field of view is incident on the sixth lens 460 can be effectively adjusted to improve aberrations.

The seventh lens 470 has negative refractive power and is made of plastic material. Its object side surface 472 is convex, and its image side surface 474 is concave, and both are aspherical. Both the object side surface 472 and the image side surface 474 have a point of inflection. This helps to shorten the back focal length to maintain miniaturization. In addition, it can effectively suppress the incident angle of the off-axis field of view, and further correct the aberration of the off-axis field of view.

The infrared filter 480 is made of glass, which is disposed between the seventh lens 470 and the imaging surface 490 and does not affect the focal length of the optical imaging system.

Please refer to Table 7 and Table 8 below for cooperation.

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

According to Table 7 and Table 8, the following conditional values can be obtained:

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

According to Table 7 and Table 8, the following conditional values can be obtained:

Fifth embodiment

Please refer to Figures 5A and 5B, where Figure 5A shows a schematic diagram of an optical imaging system according to the fifth embodiment of the present invention, and Figure 5B shows the optical imaging system of the fifth embodiment in order from left to right. Graphs of spherical aberration, astigmatism and optical distortion. Figure 5C is a lateral aberration diagram of the optical imaging system of the fifth embodiment at a field of view of 0.7. It can be seen from Figure 5A that the optical imaging system from the object side to the image side sequentially includes the aperture 500, the first lens 510, the second lens 520, the third lens 530, the fourth lens 540, the fifth lens 550, and the sixth lens 560. And the seventh lens 570, the infrared filter 580, the imaging surface 590, and the image sensor 592.

The first lens 510 has positive refractive power and is made of glass, and its object side surface 512 is a convex surface. The image side surface 514 is concave and all aspherical.

The second lens 520 has negative refractive power and is made of plastic. Its object side surface 522 is concave, its image side surface 524 is concave, and both are aspherical. Its object side surface 522 has two inflection points and the image side surface 524 has a reverse Curve point.

The third lens 530 has a negative refractive power and is made of plastic. Its object side surface 532 is convex, and its image side surface 534 is concave, and both are aspherical. Both the object side surface 532 and the image side surface 534 have an inflection point.

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

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

The sixth lens element 560 may have a negative refractive power and be made of plastic material. Its object side surface 562 is a concave surface, and its image side surface 564 is a convex surface, both of which are aspherical. In this way, the angle of each field of view incident on the sixth lens 560 can be effectively adjusted to improve aberrations.

The seventh lens 570 has a negative refractive power and is made of plastic material. Its object side surface 572 is a convex surface, its image side surface 574 is a concave surface, and its object side surface 572 and image side surface 574 both have an inflection point. This helps to shorten the back focal length to maintain miniaturization. In addition, it can effectively suppress the incident angle of the off-axis field of view and correct the aberration of the off-axis field of view.

The infrared filter 580 is made of glass, which is disposed between the seventh lens 570 and the imaging surface 590 and does not affect the focal length of the optical imaging system.

Please refer to Table 9 and Table 10 below for cooperation.

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

According to Table 9 and Table 10, the following conditional values can be obtained:

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

According to Table 9 and Table 10, the following conditional values can be obtained:

Sixth embodiment

Please refer to Figures 6A and 6B, where Figure 6A shows a schematic diagram of an optical imaging system according to the sixth embodiment of the present creation, and Figure 6B shows the optical imaging system of the sixth embodiment in order from left to right Graphs of spherical aberration, astigmatism and optical distortion. Figure 6C is a lateral aberration diagram of the optical imaging system of the sixth embodiment at a field of view of 0.7. It can be seen from Fig. 6A that the optical imaging system includes an aperture 600, a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, and a sixth lens 660 in sequence from the object side to the image side. , A seventh lens 670, an infrared filter 680, an imaging surface 690, and an image sensor 692.

The first lens 610 has a positive refractive power and is made of glass. Its object side surface 612 is a convex surface, and its image side surface 614 is a concave surface, and both are aspherical.

The second lens 620 has positive refractive power and is made of plastic material. Its object side surface 622 is convex, and its image side surface 624 is convex, both of which are aspherical. The object side surface 622 has an inflection point.

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

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

The fifth lens 650 has positive refractive power and is made of plastic, and its object side surface 652 is convex. The image side surface 654 is concave and both are aspherical. Both the object side surface 652 and the image side surface 654 have an inflection point.

The sixth lens 660 has positive refractive power and is made of plastic material. Its object side surface 662 is concave, its image side surface 664 is convex, and its image side surface 664 has two inflection points. In this way, the angle of each field of view incident on the sixth lens 660 can be effectively adjusted to improve aberrations.

The seventh lens 670 has a negative refractive power and is made of plastic material. Its object side surface 672 is a convex surface, its image side surface 674 is a concave surface, and both its object side surface 672 and the image side surface 674 have an inflection point. This helps to shorten the back focal length to maintain miniaturization. In addition, it can also effectively suppress the incident angle of the off-axis field of view, and further correct the aberration of the off-axis field of view.

The infrared filter 680 is made of glass, which is disposed between the seventh lens 670 and the imaging surface 690 and does not affect the focal length of the optical imaging system.

Please refer to Table 11 and Table 12 below for cooperation.

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

According to Table 11 and Table 12, the following conditional values can be obtained:

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

According to Table 11 and Table 12, the following conditional values can be obtained:

Although this creation has been disclosed in the implementation manner as above, it is not used to limit this creation. Anyone who is familiar with this art can make various changes and modifications without departing from the spirit and scope of this creation. Therefore, the scope of protection of this creation shall be subject to the scope of the attached patent application.

Although this creation has been specifically shown and described with reference to its illustrative embodiments, it will belong to Those with ordinary knowledge in the technical field understand that various changes in form and details can be made without departing from the spirit and scope of the creation defined by the scope of the following patent application and its equivalents.

20: Optical imaging system

200: aperture

210: first lens

212: Object side

214: like side

220: second lens

222: Object side

224: like side

230: third lens

232: Object side

234: like side

240: fourth lens

242: Object Side

244: like side

250: fifth lens

252: thing side

254: like side

260: sixth lens

262: thing side

264: like side

270: seventh lens

272: Object Side

274: Like Side

280: imaging surface

290: infrared filter

292: Image sensor

Claims (25)

An optical imaging system, from the object side to the image side, includes: a first lens with refractive power; a second lens with refractive power; a third lens with refractive power; and a fourth lens with refractive power A fifth lens with refractive power; a sixth lens with refractive power; a seventh lens with refractive power; and an imaging surface, wherein the optical imaging system has seven lenses with refractive power and at least one lens The material is glass, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, at least one of the first lens to the seventh lens has positive refractive power, and the first lens to the second lens The focal lengths of the seven lenses are f1, f2, f3, f4, f5, f6, f7, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging lens system is HEP, and the object side of the first lens is to the imaging The surface has a distance HOS on the optical axis, the object side of the first lens to the seventh lens image side has a distance of InTL on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, and the optical imaging system is in The imaging surface has a maximum imaging height HOI perpendicular to the optical axis. The intersection of any surface of any lens of the lenses with the optical axis is the starting point, and the contour of the surface is followed until the distance from the optical axis on the surface is 1/2 Up to the coordinate point at the vertical height of the entrance pupil diameter, the length of the contour curve between the aforementioned two points is ARE, which satisfies the following conditions: 1≦f/HEP≦10; 0deg<HAF≦100deg; and 0.9≦2(ARE/HEP )≦2.0. The optical imaging system according to claim 1, wherein the optical imaging system satisfies the following relationship: 0.5≦HOS/HOI≦1.9. The optical imaging system according to claim 1, wherein at least one surface of at least two of the first lens to the seventh lens has at least one inflection point. The optical imaging system of claim 1, which further includes an aperture, and a distance InS from the aperture to the imaging surface on the optical axis satisfies the following formula: 0.2≦InS/HOS≦1.1. The optical imaging system of claim 1, wherein the TV distortion of the optical imaging system at the time of image formation becomes TDT, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, and the optical imaging system The longest working wavelength of the forward meridian fan passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7HOI. The lateral aberration is expressed in PLTA, and the shortest working wavelength of the forward meridian fan passes through the edge of the entrance pupil. And the lateral aberration incident on the imaging plane at 0.7HOI is represented by PSTA, and the longest working wavelength of the negative meridian fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7HOI. The lateral aberration is represented by NLTA , The shortest working wavelength of the negative meridian fan passes through the edge of the entrance pupil and is incident on the imaging plane. The lateral aberration at 0.7HOI is expressed as NSTA, and the longest working wavelength of the sagittal fan passes through the edge of the entrance pupil and is incident on the The lateral aberration at 0.7HOI on the imaging plane is expressed as SLTA, and the shortest working wavelength of the sagittal plane fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7HOI. The lateral aberration is expressed as SSTA, which satisfies the following conditions ：PLTA≦100μm; PSTA≦100μm; NLTA≦100μm; NSTA≦100μm; SITA≦100μm; and SSTA≦100 Micron; |TDT|<100%. The optical imaging system according to claim 1, wherein the maximum effective radius of any surface of any of the lenses is expressed in EHD, and the intersection of any surface of any of the lenses with the optical axis is the starting point, Along the contour of the surface until the maximum effective radius of the surface is the end point, the length of the contour curve between the aforementioned two points is ARS, which satisfies the following formula: 0.9≦ARS/EHD≦2.0. The optical imaging system according to claim 1, wherein the intersection of the object side surface of the seventh lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is perpendicular to the diameter of the entrance pupil from the optical axis 1/2 Up to the coordinate point at the height, the length of the contour curve between the aforementioned two points is ARE71. The intersection of the image side surface of the seventh lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is 1/ 2 Up to the coordinate point at the vertical height of the entrance pupil diameter, the length of the contour curve between the aforementioned two points is ARE72, and the thickness of the seventh lens on the optical axis is TP7, which meets the following conditions: 0.05≦ARE71/TP7≦35; and 0.05≦ARE72/TP7≦35. The optical imaging system according to claim 1, wherein the point of intersection of the object side surface of the sixth lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is perpendicular to 1/2 the diameter of the entrance pupil from the optical axis Up to the coordinate point at the height, the length of the contour curve between the aforementioned two points is ARE61. The intersection of the image side surface of the sixth lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is 1/ 2 Up to the coordinate point at the vertical height of the entrance pupil diameter, the length of the contour curve between the aforementioned two points is ARE62, and the thickness of the sixth lens on the optical axis is TP6, which meets the following conditions: 0.05≦ARE61/TP6≦35; and 0.05≦ARE62/TP6≦35. The optical imaging system according to claim 1, and the optical imaging system according to claim 1, wherein the imaging surface can be selected as a plane or a curve surface. An optical imaging system comprising in order from the object side to the image side: a first lens with positive refractive power; a second lens with refractive power; a third lens with refractive power; and a fourth lens with refractive power Power; a fifth lens with refractive power; a sixth lens with refractive power; a seventh lens with refractive power; and an imaging surface, wherein the optical imaging system has seven refractive power lenses and at least one The lens is made of glass, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, and at least one surface of at least two of the first lens to the seventh lens has at least one inflection point , At least one of the first lens to the third lens has positive refractive power, at least one of the fourth lens to the seventh lens has positive refractive power, and the focal lengths of the first lens to the seventh lens are respectively f1, f2, f3, f4, f5, f6, f7, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging lens system is HEP, and the object side of the first lens to the imaging surface has an optical axis A distance HOS, a distance InTL from the object side of the first lens to the image side of the seventh lens on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, and the optical imaging system is perpendicular to the imaging plane The optical axis has a maximum imaging height HOI. The intersection of any surface of any lens of these lenses and the optical axis is the starting point, and the contour of the surface is extended to the vertical height of 1/2 entrance pupil diameter from the optical axis on the surface At Up to the coordinate point, the length of the contour curve between the aforementioned two points is ARE, which meets the following conditions: 1≦f/HEP≦10; 0deg<HAF≦60deg; 0.5≦HOS/HOI≦1.8 and 0.9≦2 (ARE/HEP) ≦2.0. The optical imaging system according to claim 10, wherein at least one surface of at least one of the first lens to the third lens has at least one critical point. The optical imaging system according to claim 10, wherein the object side surface of the first lens is convex on the optical axis and the image side surface of the second lens is convex on the optical axis. The optical imaging system according to claim 10, wherein the maximum effective radius of any surface of any of the lenses is expressed in EHD, and the intersection of any surface of any of the lenses with the optical axis is the starting point, Along the contour of the surface until the maximum effective radius of the surface is the end point, the length of the contour curve between the aforementioned two points is ARS, which satisfies the following formula: 0.9≦ARS/EHD≦2.0. The optical imaging system according to claim 10, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, and the longest operating wavelength of the forward meridian fan of the optical imaging system passes through the incident The lateral aberration at the edge of the pupil and incident on the imaging plane at 0.7 HOI is expressed in PLTA. The shortest working wavelength of the forward meridian fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7 HOI. Expressed in PSTA, the longest working wavelength of the negative meridian fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7HOI. The lateral aberration is expressed in NLTA, and the shortest working wavelength of the negative meridian fan passes through the incident The lateral aberration at the edge of the pupil and incident on the imaging plane at 0.7 HOI is expressed in NSTA, and the sagittal plane fan is the largest The lateral aberration of the long working wavelength passing through the edge of the entrance pupil and incident on the imaging plane at 0.7 HOI is represented by SLTA. The shortest working wavelength of the sagittal plane fan passes through the edge of the entrance pupil and incident on the imaging plane at 0.7 HOI. The lateral aberration is expressed as SSTA, which meets the following conditions: PLTA≦100 μm; PSTA≦100 μm; NLTA≦100 μm; NSTA≦100 μm; SLTA≦100 μm; and SSTA≦100 μm. The optical imaging system according to claim 10, wherein the distance between the first lens and the second lens on the optical axis is IN12, and satisfies the following formula: 0<IN12/f≦60. The optical imaging system according to claim 10, wherein the distance between the sixth lens and the seventh lens on the optical axis is IN67, and satisfies the following formula: 0<IN67/f≦5. The optical imaging system according to claim 10, wherein the distance between the sixth lens and the seventh lens on the optical axis is IN67, and the thickness of the sixth lens and the seventh lens on the optical axis are TP6 and respectively TP7, which meets the following conditions: 0.1≦(TP7+IN67)/TP6≦50. The optical imaging system according to claim 10, wherein the distance between the first lens and the second lens on the optical axis is IN12, and the thickness of the first lens and the second lens on the optical axis are TP1 and respectively TP2, which meets the following conditions: 0.1≦(TP1+IN12)/TP2≦50. The optical imaging system according to claim 10, wherein at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens has a wavelength Light filtering element smaller than 500nm. An optical imaging system, from the object side to the image side, sequentially includes: an aperture; a first lens with positive refractive power and made of glass; a second lens with refractive power; and a third lens with refractive power ; A fourth lens with refractive power; a fifth lens with refractive power; a sixth lens with refractive power; a seventh lens with refractive power; and an imaging surface, wherein the aperture to the imaging surface There is a distance InS on the optical axis, the optical imaging system has seven refractive power lenses, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, and the first lens to the third lens At least one of the lenses has a positive refractive power, at least one of the fourth lens to the seventh lens has a positive refractive power, and at least two of the first lens to the seventh lens have at least one surface of at least one The point of inflection, the focal lengths of the first lens to the seventh lens are f1, f2, f3, f4, f5, f6, f7, the focal length of the optical imaging system is f, and the entrance pupil diameter of the optical imaging lens system is HEP, the first lens object side to the imaging surface has a distance HOS on the optical axis, the first lens object side to the sixth lens image side has a distance of InTL on the optical axis, and the optical imaging system has a maximum visibility Half of the angle is HAF, and the intersection of any surface of any lens in these lenses with the optical axis is the starting point, and follow the contour of the surface to the coordinate at the vertical height of 1/2 the diameter of the entrance pupil from the optical axis Point, the length of the contour curve between the aforementioned two points is ARE, which is full The following conditions are met: 1≦f/HEP≦10; 0deg<HAF≦100deg; 0.5≦HOS/HOI≦1.6; 0.9≦InS/HOS≦1.1 and 0.9≦2(ARE/HEP)≦2.0. The optical imaging system according to claim 20, wherein at least one surface of at least one of the first lens to the third lens has at least one critical point, the object side surface of the first lens is convex on the optical axis, and the first lens The image side of the two lenses is convex on the optical axis. The optical imaging system according to claim 20, wherein the optical imaging lens system satisfies the following formula: HOI≧5mm. The optical imaging system according to claim 20, wherein the intersection of the object side surface of the seventh lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is perpendicular to the diameter of the entrance pupil from the optical axis 1/2 Up to the coordinate point at the height, the length of the contour curve between the aforementioned two points is ARE71. The intersection of the image side surface of the seventh lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is 1/ 2 Up to the coordinate point at the vertical height of the entrance pupil diameter, the length of the contour curve between the aforementioned two points is ARE72, and the thickness of the seventh lens on the optical axis is TP7, which meets the following conditions: 0.05≦ARE71/TP7≦35; and 0.05≦ARE72/TP7≦35. The optical imaging system according to claim 20, wherein the point of intersection of the object side surface of the sixth lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is perpendicular to 1/2 the diameter of the entrance pupil from the optical axis Up to the coordinate point at the height, the length of the contour curve between the aforementioned two points is ARE61. The intersection of the image side surface of the sixth lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is 1/ 2 The length of the contour curve between the aforementioned two points is ARE62, the thickness of the sixth lens on the optical axis is TP6, which meets the following conditions: 0.05≦ ARE61/TP6≦35; and 0.05≦ARE62/TP6≦35. The optical imaging system according to claim 20, wherein the optical imaging system further includes an image sensing element and a driving module, the image sensing element is disposed on the imaging surface, and the driving module can be in phase with the lenses Coupling and displacing these lenses.

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