TWM598418U - 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 about an optical imaging system group, and in particular is about 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 photosensitive coupled devices (Charge Coupled Device; CCD) or Complementary Metal-Oxide Semiconductor Sensors (CMOS Sensor). With the improvement 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 like the description of the geometric shape changes at different heights from the side to the optical axis), thereby effectively increasing the amount of light entering the optical imaging system, and at the same time improving the imaging quality, so that it can be applied to small electronic products.

The terms and codes of 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 the 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 the 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 depth of the lens surface

The intersection of the object side surface of the seventh lens on the optical axis to the end point of the maximum effective radius of the object side surface of the seventh lens, the distance between the two points horizontal to the optical axis is expressed by InRS71 (the maximum effective radius is deep Degrees); the intersection of the image side surface of the seventh lens on the optical axis to the end of the maximum effective radius of the image side surface of the seventh lens, the distance between the 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 of the fifth lens object side 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), and the sixth lens object The vertical distance between the critical point C61 on the side surface and the optical axis is HVT61 (illustrated), and the vertical distance between the critical point C62 on the side surface of the sixth lens and the optical axis is HVT62 (illustrated). 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, and 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 point 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 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 parallel to the optical axis, and the vertical distance between this point of IF723 and the optical axis 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 point 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 Modulation Transfer Function (MTF) of the optical imaging system is used to test and evaluate the contrast and sharpness of the imaging system. The vertical axis of the modulation transfer function characteristic graph represents the contrast transfer rate (value from 0 to 1), and the horizontal axis represents the spatial frequency (cycles/mm; lp/mm; line pairs per mm). The perfect imaging system can theoretically show 100% The line contrast of the subject, but the actual imaging system, the contrast transfer rate value of the vertical axis is less than 1. In addition, generally speaking, the edge area of the image is more difficult to obtain fine reduction than the center area. The visible light spectrum is on the imaging surface. The contrast transfer rate (MTF value) of the optical axis, 0.3 field of view, and 0.7 field of view at a spatial frequency of 55 cycles/mm is represented by MTFE0, MTFE3, and MTFE7, respectively. Optical axis, 0.3 field of view, and 0.7 field of view The contrast transfer rate (MTF value) of field 3 at the spatial frequency of 110 cycles/mm is represented by MTFQ0, MTFQ3, and MTFQ7, respectively, and the optical axis, 0.3 field of view and 0.7 field of view are used for the contrast transfer rate (MTF value) of the spatial frequency of 220 cycles/mm. Denoted by MTFH0, MTFH3, and MTFH7, the contrast transfer rate (MTF value) of the optical axis, 0.3 field of view, and 0.7 field of view at a spatial frequency of 440 cycles/mm are expressed as MTF0, MTF3, and MTF7, respectively. The center, inner field of view, and outer field of view of the lens are representative, so it can be used to evaluate the performance of a particular optical imaging system. If the design of the optical imaging system corresponds to the pixel size (Pixel Size) containing the photosensitive element below 1.12 microns, so the modulation transfer function characteristic diagram of the quarter spatial frequency, half the spatial frequency (half frequency) and the full spatial frequency ( Full frequency) are at least 110cycles/mm, 220cycles/mm and 440cycles/mm respectively.

If the optical imaging system must also meet the imaging requirements of the infrared spectrum, such as night vision requirements for low light sources, the working wavelength used can be 850nm or 800nm. Since the main function is to identify the contours of objects formed by black and white light and dark, high resolution is not required Therefore, it is only necessary to select a spatial frequency less than 110 cycles/mm to evaluate the performance of a specific optical imaging system in the infrared spectrum. When the aforementioned working wavelength of 850nm is focused on the imaging surface, the contrast transfer rate (MTF value) of the image at the optical axis, 0.3 field of view, and 0.7 field of view at a spatial frequency of 55 cycles/mm is represented by MTFI0, MTFI3, and MTFI7, respectively. However, because the infrared operating wavelength of 850nm or 800nm is far from the general visible light wavelength, if the optical imaging system needs to be able to focus on visible light and infrared (dual mode) at the same time and achieve certain performance, it is quite difficult to design.

This creation provides an optical imaging system that can simultaneously focus on visible light and infrared (dual mode) And achieve a certain performance respectively, and the seventh lens is provided with a reflex point on the object side or image side, which can effectively adjust the angle of each field of view incident on the seventh lens, and correct 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 first There is a distance HOS from the object side of a lens to the imaging mask, and there is 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 imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, and the thicknesses of the first lens to the seventh lens at 1/2 HEP height and parallel to the optical axis are ETP1, ETP2, ETP3, ETP4, ETP5, ETP6 and ETP7, the sum of the aforementioned ETP1 to ETP7 is SETP, the thickness of the first lens to the seventh lens on the optical axis are TP1, TP2, TP3, TP4, TP5, TP6, and TP7, respectively. The sum is STP, which meets the following conditions: 1≦f/HEP≦10; and 0.5≦SETP/STP<1.

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 two 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 of InTL on the optical axis, the optical imaging Half of the maximum viewing angle of the system is HAF, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, and the coordinate point of 1/2 HEP height on the object side of the first lens to the imaging surface The horizontal distance parallel to the optical axis is ETL, and the distance between the coordinate point on the object side of the first lens at 1/2 HEP height and the coordinate point on the image side of the seventh lens at 1/2 HEP height is parallel to the optical axis The horizontal distance is EIN, which meets the following conditions: 1≦f/HEP≦10; 0.5≦HOS/HOI≦1.8 and 0.2≦EIN/ETL<1.

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 . The optical imaging system has seven lenses with 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 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. 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 first There is a distance HOS from the object side of a lens to the imaging mask, and there is 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 imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, and the horizontal distance between the coordinate point on the object side of the first lens at 1/2 HEP height and the imaging plane parallel to the optical axis is ETL. The horizontal distance between the coordinate point on the object side of the first lens at 1/2 HEP height and the coordinate point on the image side of the seventh lens at 1/2 HEP height parallel to the optical axis is EIN, which satisfies the following conditions: 1≦ f/HEP≦10; 0.5≦HOS/HOI≦1.6; and 0.2≦EIN/ETL<1.

The thickness of a single lens at the height of 1/2 entrance pupil diameter (HEP), especially affects the correction aberrations of the common area of the field of view of each light within the range of 1/2 entrance pupil diameter (HEP) and the optical path difference between the rays of each field of view Ability, the greater the thickness, the better the ability to correct aberrations, but at the same time it will also increase manufacturing difficulties Therefore, it is necessary to control the thickness of a single lens at 1/2 entrance pupil diameter (HEP) height, especially control the thickness (ETP) of the lens at 1/2 entrance pupil diameter (HEP) height and the lens to which the surface belongs. The proportional relationship (ETP/TP) between the thickness (TP) on the optical axis. For example, the thickness of the first lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP1. The thickness of the second lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP2. The thickness of the remaining lenses in the optical imaging system at the height of 1/2 the entrance pupil diameter (HEP) can be expressed in the same way. The sum of the aforementioned ETP1 to ETP7 is SETP, and the embodiment of this creation can satisfy the following formula: 0.3≦SETP/EIN<1.

In order to balance the ability to correct aberrations and reduce the difficulty of manufacturing, it is particularly necessary to control the thickness (ETP) of the lens at 1/2 entrance pupil diameter (HEP) height and the thickness of the lens on the optical axis (TP). ) The proportional relationship between (ETP/TP). For example, the thickness of the first lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP1, the thickness of the first lens on the optical axis is TP1, and the ratio between the two is ETP1/TP1. The thickness of the second lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP2, the thickness of the second lens on the optical axis is TP2, and the ratio between the two is ETP2/TP2. The proportional relationship between the thickness of the remaining lenses in the optical imaging system at 1/2 entrance pupil diameter (HEP) height and the thickness (TP) of the lens on the optical axis, and the expression is analogous. The embodiment of this creation can satisfy the following formula: 0.2≦ETP/TP≦3.

The horizontal distance between two adjacent lenses at 1/2 entrance pupil diameter (HEP) height is represented by ED. The aforementioned horizontal distance (ED) is parallel to the optical axis of the optical imaging system, and particularly affects the 1/2 entrance pupil diameter (HEP). ) The ability to correct aberrations in the common area of the field of view of each light and the optical path difference between each field of view. The greater the horizontal distance, the possibility of correcting aberrations will increase, but it will also increase the difficulty of manufacturing Therefore, it is necessary to control the horizontal distance (ED) between specific adjacent two lenses at 1/2 entrance pupil diameter (HEP) height.

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

The horizontal distance between the coordinate point on the image side surface of the seventh lens at 1/2 HEP height and the imaging surface parallel to the optical axis is EBL, and the intersection point on the image side surface of the seventh lens with the optical axis to the imaging surface parallel to the light The horizontal distance of the axis is BL. The embodiment of the present invention balances the ability to correct aberrations and reserves the accommodation space for other optical elements at the same time, and the following formula can be satisfied: 0.2≦EBL/BL<1.5. The optical imaging system may further include a filter element, the filter element is located between the seventh lens and the imaging surface, and the sixth lens is parallel between the coordinate point of 1/2 HEP height on the image side and the filter element The distance from the optical axis is EIR, and the distance between the intersection of the seventh lens image side and the optical axis and the filter element parallel to the optical axis is PIR. The embodiment of this creation can satisfy the following formula: 0.1≦EIR/PIR ≦1.1.

When |f1|>|f7|, the total system height (HOS; Height of Optic System) of the optical imaging 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 reverse 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 radius of curvature 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

ΣTP: 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 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 close 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 element (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 at the time of image formation (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 Graph; Figure 1C is a diagram showing the visible light spectrum modulation conversion characteristic diagram of the optical imaging system of the optical imaging system of the first embodiment of the creation; Figure 2A is a schematic diagram of the optical imaging system of the second embodiment of the creation; Figure 2B shows the curves of spherical aberration, astigmatism and optical distortion of the optical imaging system of the second embodiment of this creation in order from left to right; Figure 2C shows the visible light of the optical imaging system of the second embodiment of this creation Spectrum modulation conversion characteristic diagram; Figure 3A shows a schematic diagram of the optical imaging system of the third embodiment of this creation; Figure 3B shows the spherical aberration of the optical imaging system of the third embodiment of this creation in order from left to right, Curves of astigmatism and optical distortion; Figure 3C is a diagram showing the visible light spectrum modulation conversion characteristic diagram of the optical imaging system of the third embodiment of the invention; Figure 4A is a schematic diagram of the optical imaging system of the fourth embodiment of the invention Figure 4B shows the spherical aberration, astigmatism, and optical distortion of the optical imaging system of the fourth embodiment of the creation in order from left to right; Figure 4C shows the fourth embodiment of the creation of the optical imaging system The visible light spectrum modulation conversion characteristic diagram; 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 Graph; Fig. 5C is a diagram showing the visible light spectrum modulation conversion characteristic diagram of the optical imaging system of the fifth embodiment of the invention; Fig. 6A is a schematic diagram of the optical imaging system of the sixth embodiment of the invention; Fig. 6B is from the left To the right, the graphs of spherical aberration, astigmatism, and optical distortion of the optical imaging system of the sixth embodiment of this creation are drawn in sequence; Figure 6C shows the visible light spectrum modulation conversion characteristics of the optical imaging system of the sixth embodiment of this creation Figure.

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, namely 486.1nm, 587.5nm, and 656.2nm, of which 587.5nm is the main reference wavelength and the reference wavelength for the main extraction technical features. The optical imaging system can also be designed with five working wavelengths, namely 470nm, 510nm, 555nm, 610nm, 650nm, of which 555nm is the main reference wavelength and is the 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 Σ PPR, and the sum of NPR of all negative refractive power lenses is Σ NPR. When the following conditions are met, it helps to control the total refractive power and total length of the optical imaging system: 0.5≦Σ PPR/|Σ NPR|≦15, preferably, the following conditions can be satisfied: 1≦Σ PPR/|Σ NPR|≦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 sensing element (that is, the imaging height or maximum image height of the optical imaging system) is HOI, and the distance from the object side of the first lens to the 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 invention, 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 either a front aperture or a center 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 the efficiency of image sensing elements for receiving images can be increased; 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, the miniaturization of the optical imaging system and the wide-angle characteristics can be maintained at the same time.

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 Σ TP, which satisfies the following conditions: 0.1≦Σ TP/InTL≦0.9. In this way, the contrast of the system imaging and the yield rate of lens manufacturing can be taken into consideration 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 Refraction strength, to avoid the increase of overspeed. 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 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. In this way, it is helpful to control the manufacturing sensitivity of the optical imaging system 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 meets the following conditions: 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 between the object side of the first lens and the image side of the seventh lens is InTL, which 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 on the optical axis of the seventh lens image side to the critical point C72 on the optical axis The distance 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 conditions 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 closest 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. 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 seventh lens, which is parallel to the optical axis, 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|≦5 mm; 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 reflex of the seventh lens image side close to the optical axis 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 reflex point of the seventh lens object side near the optical axis and the optical axis is represented by HIF713. The intersection point of the seventh lens image side on the optical axis to the third reflex near the optical axis of the seventh lens image side 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 the present invention can be used to correct the chromatic aberration of the optical imaging system by staggering lenses with high and low dispersion coefficients.

The equation 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 and image sides 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 creative optical imaging system 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 the optical system of mobile focusing according to the needs, 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 as a light filtering element with a wavelength less than 500nm depending on the needs. This 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 improves the relative The illuminance also helps.

According to the above-mentioned embodiments, specific examples are presented below and described in detail 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 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. Figure 1C is a diagram showing the visible light spectrum modulation conversion characteristic diagram of this embodiment. 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 thickness of the first lens on the optical axis is TP1, and the thickness of the first lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP1.

The horizontal displacement distance parallel to the optical axis from the intersection point of the object side surface of the first lens on the optical axis to the inflection point of the closest optical axis of the object side surface of the first lens is represented by SGI111, and the intersection point of the image side surface of the first lens on the optical axis to The horizontal displacement distance parallel to the optical axis between the closest inflection point of the optical axis of the first lens image side is represented by SGI121, which 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 of the first lens image, which is parallel to the optical axis, is represented by SGI122, which meets 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 of the first lens object side 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. The object side 122 is a convex surface, and the image side 124 is a concave surface, and both are aspherical. The thickness of the second lens on the optical axis is TP2, and the thickness of the second lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP2.

The horizontal displacement distance parallel to the optical axis from the intersection point of the second lens object side surface on the optical axis to the inflection point of the closest optical axis of the second lens object side surface is represented by SGI211, and the second 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 second lens on the image side and 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 thickness of the third lens on the optical axis is TP3, and the thickness of the third lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP3.

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 inflection point of the closest optical axis on the image side of the third lens parallel to the optical axis is less than SGI321 said.

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 image side of the third lens is on the optical axis. 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 reflex point of the closest optical axis on the object side of the third lens and the optical axis is represented by HIF311. The intersection of the image side of the third lens on the optical axis to the reflex 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 reflex point of the third lens on the object side of the third lens near the optical axis and the optical axis is represented by HIF312. The intersection of the image side of the third lens on the optical axis to the reflex of the second near the optical axis 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 a convex surface, its image side surface 144 is a convex surface, and both are aspherical, and its object side surface 142 has an inflection point. The thickness of the fourth lens on the optical axis is TP4, and the thickness of the fourth lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP4.

The horizontal displacement distance parallel to the optical axis from the intersection point of the object side surface of the fourth lens on the optical axis to the inflection point of the closest optical axis of the object side surface of the fourth lens is represented by SGI411, and the intersection point of the image side surface of the fourth lens on the optical axis to The horizontal displacement distance between the inflection point of the closest optical axis of the fourth lens image side and parallel to the optical axis is represented by SGI421, which satisfies 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 of 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 reflex 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 reflex of the second near the optical axis of the fourth lens image side The vertical distance between the point and the optical axis is represented by HIF422.

The fifth lens 150 has a positive refractive power and is made of plastic material. 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 thickness of the fifth lens on the optical axis is TP5, and the thickness of the fifth lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP5.

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 of the object side of the fifth lens on the optical axis to the second inflection point of the object side of the fifth lens that is close 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. The object side surface 162 is a convex surface, the image side surface 164 is a concave surface, and the object side surface 162 and the image side surface 164 both 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 thickness of the sixth lens on the optical axis is TP6, and the thickness of the sixth lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP6.

The horizontal displacement distance parallel to the optical axis from the intersection point of the sixth lens object side surface on the optical axis to the inflection point of the closest optical axis of the sixth lens object side surface is represented by SGI611, and the intersection point of the sixth lens image side surface 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. 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 thickness of the seventh lens on the optical axis is TP7, and the thickness of the seventh lens at 1/2 entrance pupil diameter (HEP) height is represented by ETP7.

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 intersection of the image side of the seventh lens on the optical axis to The horizontal displacement distance parallel to the optical axis between the closest inflection point of the optical axis on the image side of the seventh lens is represented by SGI721, which meets 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.

In this embodiment, the distance from the coordinate point at 1/2 HEP height on the object side of the first lens to the imaging plane parallel to the optical axis is ETL, and the distance from the coordinate point at 1/2 HEP height on the object side of the first lens to the first lens The horizontal distance between the coordinate points on the side of the seven-lens image at 1/2 HEP height parallel to the optical axis is EIN, which meets the following conditions: ETL=26.980mm; EIN=24.999mm; EIN/ETL=0.927.

This embodiment meets the following conditions: ETP1=2.470mm; ETP2=5.144mm; ETP3=0.898mm; ETP4=1.706mm; ETP5=3.901mm; ETP6=0.528mm; ETP7=1.077mm. The sum of the aforementioned ETP1 to ETP7 SETP=15.723 mm. TP1=2.276mm; TP2=5.240mm; TP3=0.837mm; TP4=2.002mm; TP5=4.271mm; TP6=0.300mm; TP7=1.118mm; the sum of the aforementioned TP1 to TP7, STP=16.044mm. SETP/STP=0.980. SETP/EIN=0.629.

This embodiment specifically controls the proportional relationship (ETP/TP) between the thickness (ETP) of each lens at 1/2 entrance pupil diameter (HEP) height and the thickness (TP) of the lens on the optical axis to which the surface belongs. , In order to strike a balance between manufacturability and the ability to correct aberrations, it satisfies the following conditions, ETP1/TP1=1.085; ETP2/TP2=0.982; ETP3/TP3=1.073; ETP4/TP4=0.852; ETP5/TP5=0.914; ETP6 /TP6=1.759; ETP7/TP7=0.963.

This embodiment is to control the horizontal distance of each adjacent two lenses at 1/2 entrance pupil diameter (HEP) height, in order to balance the length of the optical imaging system, the degree of "shrinkage", the manufacturability and the ability to correct aberrations. , Especially to control the proportional relationship between the horizontal distance (ED) of the two adjacent lenses at 1/2 entrance pupil diameter (HEP) height and the horizontal distance (IN) of the two adjacent lenses on the optical axis (ED/IN) ), which meets the following Column conditions, the horizontal distance between the first lens and the second lens at 1/2 entrance pupil diameter (HEP) height parallel to the optical axis is ED12=4.474mm; the second lens and the third lens are at 1/2 entrance pupil The horizontal distance between the diameter (HEP) and the height parallel to the optical axis is ED23=0.349mm; the horizontal distance between the third lens and the fourth lens at 1/2 entrance pupil diameter (HEP) height is ED34=1.660 mm; the horizontal distance between the fourth lens and the fifth lens at 1/2 entrance pupil diameter (HEP) height parallel to the optical axis is ED45=1.794mm; the fifth lens and the sixth lens are at 1/2 entrance pupil diameter (HEP) The horizontal distance of the height parallel to the optical axis is ED56=0.714mm. The horizontal distance between the sixth lens and the seventh lens parallel to the optical axis at 1/2 entrance pupil diameter (HEP) height is ED67=0.284mm. The aforementioned sum of ED12 to ED67 is expressed in SED and SED=9.276 mm.

The horizontal distance between the first lens and the second lens on the optical axis is IN12=4.552mm, ED12/IN12=0.983. The horizontal distance between the second lens and the third lens on the optical axis is IN23=0.162mm, ED23/IN23=2.153. The horizontal distance between the third lens and the fourth lens on the optical axis is IN34=1.927mm, ED34/IN34=0.862. The horizontal distance between the fourth lens and the fifth lens on the optical axis is IN45=1.515mm, ED45/IN45=1.184. The horizontal distance between the fifth lens and the sixth lens on the optical axis is IN56=0.050mm, ED56/IN56=14.285. The horizontal distance between the sixth lens and the seventh lens on the optical axis is IN67=0.211mm, ED67/IN67=1.345. The sum of the aforementioned IN12 to IN67 is represented by SIN and SIN=8.418 mm. SED/SIN=1.102.

This implementation also meets the following conditions: ED12/ED23=12.816; ED23/ED34=0.210; ED34/ED45=0.925; ED45/ED56=2.512; ED56/ED67=2.512; IN12/IN23=28.080; IN23/IN34=0.084; IN34 /IN45=1.272; IN45/IN56=30.305; IN56/IN67=0.236.

The horizontal distance between the coordinate point on the image side surface of the seventh lens at 1/2 HEP height and the imaging surface parallel to the optical axis is EBL=1.982mm, and the intersection point on the image side surface of the seventh lens with the optical axis to the imaging surface The horizontal distance parallel to the optical axis is BL=2.517mm, and the embodiment of this creation can satisfy the following formula: EBL/BL=0.7874. In this embodiment, the distance between the coordinate point at 1/2 HEP height on the side surface of the seventh lens image and the infrared filter parallel to the optical axis is EIR=0.865mm, and the intersection point on the side surface of the seventh lens image with the optical axis to the infrared The distance between the filters parallel to the optical axis is PIR=1.400mm, and satisfies the following formula: EIR/PIR=0.618.

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, and half of the maximum angle of view in the optical imaging system is HAF. 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 respectively f2, f3, f4, f5, f6, 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 total PPR of all lenses with positive refractive power is ΣPPR=f/f2+f/f4+f/f5+f/f7=1.7384, and the total NPR of all lenses with negative refractive power is ΣNPR=f/f1+f /f3+f/f6=-0.9999, Σ PPR/|Σ NPR|=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 meets 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 lenses with refractive power on the optical axis is Σ TP, which meets the following conditions: Σ TP=16.0446 mm; and Σ TP/InTL=0.6559. In this way, the contrast of the system imaging and the yield rate of lens manufacturing can be taken into consideration 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 meets 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 astigmatism generated by the optical imaging system.

In the optical imaging system of this embodiment, the sum of the focal lengths of all lenses with positive refractive power is Σ PP, which satisfies the following conditions: Σ PP=f2+f4+f5+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 Σ NP, which meets the following conditions: Σ NP=f1+f3+f6=-118.1178mm; and f1/(f1+f3+f6 )=0.1677. This helps to properly distribute the negative refractive power of the first lens to other negative lenses to suppress the incidence Significant aberrations occur in the process of light travel.

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=2.2761

mm; TP2=0.2398mm; and (TP1+IN12)/TP2=1.3032. In this way, it is helpful to control the manufacturing sensitivity of the optical imaging system and improve its performance.

In the optical imaging system of this embodiment, the thicknesses 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 of 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 is helpful 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 to the optical axis is InRS61, and the sixth lens image side surface 164 is at The horizontal displacement distance from the intersection on the optical axis to the maximum effective radius position of the image side surface 164 of the sixth lens on the optical axis is InRS62, and the thickness of the sixth lens 160 on the optical axis is TP6, which satisfies the following conditions: InRS61=-0.7823mm ; 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, and 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 dispersion coefficient of the seventh lens is NA7, which meets 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 during image formation is TDT, the optical distortion at the time of image formation becomes ODT, which meets the following conditions: |TDT|=2.5678%; |ODT|=2.1302%.

In the optical imaging system of this embodiment, the optical axis, 0.3HOI, and 0.7HOI of the visible light on the imaging plane, the modulation conversion contrast transfer rate (MTF value) at a spatial frequency of 55 cycles/mm are represented by MTFE0, MTFE3, and MTFE7, respectively. It satisfies the following conditions: MTFE0 is approximately 0.35; MTFE3 is approximately 0.14; and MTFE7 is approximately 0.28. The optical axis, 0.3HOI and 0.7HOI of the visible light on the imaging plane are three modulation conversion contrast transfer ratios (MTF values) at a spatial frequency of 110 cycles/mm expressed as MTFQ0, MTFQ3 and MTFQ7 respectively, which meet the following conditions: MTFQ0 is about 0.126 ; MTFQ3 is approximately 0.075; and MTFQ7 is approximately 0.177. The optical axis, 0.3HOI, and 0.7HOI on the imaging surface are three modulation conversion contrast transfer rates (MTF values) at a spatial frequency of 220 cycles/mm expressed as MTFH0, MTFH3, and MTFH7, respectively, which meet the following conditions: MTFH0 is about 0.01; MTFH3 is about 0.01; and MTFH7 is about 0.01.

In the optical imaging system of this embodiment, the infrared working wavelength is 850nm when focused on the imaging plane, the optical axis of the image on the imaging plane, 0.3HOI and 0.7HOI are three modulation conversion contrast transfer rates at the spatial frequency (55 cycles/mm) (MTF value) are represented by MTFI0, MTFI3, and MTFI7, respectively, which meet the following conditions: MTFI0 is about 0.01; MTFI3 is about 0.01; and MTFI7 is about 0.01.

Refer to Table 1 and Table 2 below for cooperation.

Table 1 shows the detailed structure 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 diagram showing the visible light spectrum modulation conversion characteristic diagram of this embodiment. It can be seen from Figure 2A that the optical imaging system 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 in sequence from the object side to the image side. 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. Its object side surface 212 is convex, and its image side surface 214 is concave, and both are aspherical. Both the object side surface 212 and the image side surface 214 have an inflection point.

The second lens 220 has a negative refractive power and is made of plastic material. Its object side surface 222 is convex, and its 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 positive refractive power and is made of plastic material. Its object side surface 232 is convex, and its image side surface 234 is concave, both of which are aspherical. The object side surface 232 has a point of inflection.

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 260 has a positive refractive power and is made of plastic material. 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 negative refractive power and is made of plastic material, and its object side surface 272 is convex. The image side surface 274 is concave. 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 can 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.

Table 4. Aspheric coefficients of the second embodiment

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:

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. Fig. 3C is a diagram showing the visible light spectrum modulation conversion characteristic diagram of this embodiment. It can be seen from Figure 3A that the optical imaging system includes the aperture 300, the first lens 310, the second lens 320, the third lens 330, the fourth lens 340, the fifth lens 350, and the sixth lens 360 in sequence from the object side to the image side. 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, both of which are aspherical. 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 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 inflections. point.

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 surfaces, and its image side surface 364 has two inflection points. In this way, 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. 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 conditional values can be obtained:

Fourth embodiment

Please refer to FIGS. 4A and 4B. FIG. 4A shows a schematic diagram of an optical imaging system according to the fourth embodiment of the present invention, and FIG. 4B shows the optical imaging system of the fourth embodiment in order from left to right. Graphs of spherical aberration, astigmatism and optical distortion. Fig. 4C is a diagram showing the visible light spectrum modulation conversion characteristic diagram of this embodiment. It can be seen from Figure 4A that the optical imaging system includes the aperture 400, the first lens 410, the second lens 420, the third lens 430, the fourth lens 440, the fifth lens 450, and the 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 aspherical. Both the object side surface 422 and the image side surface 424 have a point of inflection.

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

The fourth lens 440 has a 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, 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 element 460 has a positive refractive power and is made of plastic material. Its object side surface 462 is convex, its image side surface 464 is convex, and both are aspherical. Its object side surface 462 has an inflection point and the image side surface 464 has two reverses. Curve point. In this way, the angle of each field of view incident on the sixth lens 460 can be effectively adjusted to improve aberrations.

The seventh lens 470 has a 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 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 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 conditional values can be obtained:

Fifth embodiment

Please refer to Figures 5A and 5B. Figure 5A shows a schematic diagram of an optical imaging system according to the fifth embodiment of the present invention. 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. Fig. 5C is a diagram showing the characteristics of the visible light spectrum modulation conversion of this embodiment. It can be seen from FIG. 5A that the optical imaging system includes an aperture 500, a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, and a sixth lens 560 in sequence from the object side to the image side. And a seventh lens 570, an infrared filter 580, an imaging surface 590, and an image sensor 592.

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

The second lens 520 has a 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. 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 a point of inflection.

The fifth lens 550 has a positive refractive power and is made of plastic material. 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 a point of inflection.

The sixth lens 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 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 the 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. 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 conditional values can be obtained:

Sixth embodiment

Please refer to FIGS. 6A and 6B. FIG. 6A shows a schematic diagram of an optical imaging system according to the sixth embodiment of the present invention, and FIG. 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 diagram showing the visible light spectrum modulation conversion characteristic diagram of this embodiment. 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 a 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, and both 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 material, and its object side surface 652 is convex. The image side surface 654 is concave and both 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 aberration.

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 aspherical curve equation 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 conditional values can be obtained:

Although this creation has been disclosed in the implementation manner as above, it is not intended 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, this creation is protected The scope shall be subject to the scope of the attached patent application.

Although this creation has been specifically shown and described with reference to its exemplary embodiments, it will be understood by those with ordinary knowledge in the technical field that it does not deviate from the spirit of this creation defined by the scope of the following patents and its equivalents Various changes in form and details can be made under the category and category.

30: Optical imaging system

300: aperture

310: The first lens

312: thing side

314: like side

320: second lens

322: Object Side

324: like side

330: third lens

332: thing side

334: like side

340: fourth lens

342: Object Side

344: like side

350: fifth lens

352: thing side

354: like side

360: sixth lens

362: Object Side

364: Like Side

370: seventh lens

372: Object Side

374: like side

380: imaging surface

390: infrared filter

392: image sensor

Claims (25)

An optical imaging system includes in order from the object side to the image side: 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 image side of the seventh lens has a distance of InTL on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, and the first lens to The thickness of the seventh lens at 1/2 HEP height and parallel to the optical axis are ETP1, ETP2, ETP3, ETP4, ETP5, ETP6, and ETP7 respectively. The sum of the foregoing ETP1 to ETP7 is SETP, and the first lens to the seventh lens The thickness of the lens on the optical axis is TP1, TP2, TP3, TP4, TP5, TP6, and TP7. The sum of the aforementioned TP1 to TP7 is STP, which meets the following conditions: 1≦f/HEP≦10; 0deg<HAF≦100deg; And 0.5 ≦SETP/STP<1. 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 of claim 1, which further includes an aperture, and there is a distance InS from the aperture to the imaging surface on the optical axis, which satisfies the following formula: 0.2≦InS/HOS≦1.1. 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 according to claim 1, wherein the horizontal distance between the coordinate point at 1/2 HEP height on the object side of the first lens and the imaging surface parallel to the optical axis is ETL, and the horizontal distance on the object side of the first lens The horizontal distance parallel to the optical axis between the coordinate point at 1/2 HEP height and the coordinate point at 1/2 HEP height on the image side of the seventh lens is EIN, which satisfies the following condition: 0.2≦EIN/ETL<1. The optical imaging system according to claim 1, wherein the thicknesses of the first lens to the seventh lens at a height of 1/2 HEP and parallel to the optical axis are ETP1, ETP2, ETP3, ETP4, ETP5, ETP6 and ETP7, The sum of the aforementioned ETP1 to ETP6 is SETP, which satisfies the following formula: 0.2≦SETP/EIN<1. The optical imaging system according to claim 1, wherein the optical imaging system includes a filter element located between the seventh lens and the imaging surface, and the seventh lens is on the 1/2 HEP image side The distance from the height coordinate point to the filter element parallel to the optical axis is EIR, and the distance from the intersection of the seventh lens image side with the optical axis to the filter element parallel to the optical axis is PIR, which is full The following formula is sufficient: 0.1≦EIR/PIR≦1.1. The optical imaging system according to claim 1, wherein the optical axis, 0.3HOI, and 0.7HOI on the imaging surface are three modulation conversion contrast transfer rates (MTF values) at a spatial frequency of 55 cycles/mm in terms of MTFE0, MTFE3, and MTFE7, respectively Indicates that it meets the following conditions: MTFE0≧0.2; MTFE3≧0.01; and MTFE7≧0.01. The optical imaging system according to claim 1, wherein the horizontal distance between the coordinate point at 1/2 HEP height on the image side surface of the seventh lens and the imaging surface parallel to the optical axis is EBL, and the horizontal distance from the image side surface of the seventh lens The horizontal distance from the intersection with the optical axis to the imaging surface parallel to the optical axis is BL, which satisfies the following formula: 0.1≦EBL/BL≦1.5. An optical imaging system, from the object side to the image side, includes: 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 a refractive power of seven lenses and at least one The lens material is 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 a positive refractive index At least one of the fourth lens to the seventh lens has a positive refractive power, the focal lengths of the first lens to the seventh lens are f1, f2, f3, f4, f5, f6, f7, and the optical imaging The focal length of the system is f, the entrance pupil diameter of the optical imaging lens system is HEP, the object side of the first lens to the imaging surface has a distance HOS on the optical axis, the object side of the first lens to the image side of the seventh lens There is a distance InTL on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, and the horizontal distance between the coordinate point on the object side of the first lens at 1/2 HEP height and the imaging plane parallel to the optical axis For ETL, the horizontal distance between the coordinate point on the object side of the first lens at 1/2 HEP height and the coordinate point on the image side of the seventh lens at 1/2 HEP height parallel to the optical axis is EIN, which satisfies the following Conditions: 1≦f/HEP≦10; 0deg<HAF≦60deg; 0.5≦HOS/HOI≦1.8 and 0.2≦EIN/ETL<1. 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 object side surface of the second lens is convex on the optical axis. The optical imaging system according to claim 10, wherein the coordinate point on the image side surface of the sixth lens at 1/2 HEP height to the coordinate point on the object side surface of the seventh lens at 1/2 HEP height is parallel to the optical axis The horizontal distance is ED67, and the distance between the sixth lens and the seventh lens on the optical axis is IN67, which satisfies the following conditions: 0<ED67/IN67≦50. The optical imaging system according to claim 10, wherein the coordinate point on the side surface of the first lens at 1/2 HEP height to the coordinate point on the object side surface of the second lens at 1/2 HEP height is parallel to the optical axis The horizontal distance is ED12, and the distance on the optical axis between the first lens and the second lens is IN12, which satisfies the following conditions: 0<ED12/IN12≦10. The optical imaging system according to claim 10, wherein the thickness of the second lens at a height of 1/2 HEP and parallel to the optical axis is ETP2, and the thickness of the second lens on the optical axis is TP2, which meets the following conditions: 0<ETP2/TP2≦3. The optical imaging system of claim 10, wherein the thickness of the sixth lens at a height of 1/2 HEP and parallel to the optical axis is ETP6, and the thickness of the sixth lens on the optical axis is TP6, which meets the following conditions: 0<ETP6/TP6≦5. The optical imaging system according to claim 10, wherein the thickness of the seventh lens at 1/2 HEP height and parallel to the optical axis is ETP7, and the thickness of the seventh lens on the optical axis is TP7, which meets the following conditions: 0<ETP7/TP7≦5. 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 optical axis, 0.3HOI and 0.7HOI on the imaging surface are at spatial frequencies The modulation conversion contrast transfer rate (MTF value) of 110 cycles/mm is represented by MTFQ0, MTFQ3, and MTFQ7 respectively, which meets the following conditions: MTFQ0≧0.2; MTFQ3≧0.01; and MTFQ7≧0.01. 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 is Light filtering element with wavelength less than 500nm. An optical imaging system, from the object side to the image side, includes: an aperture; a first lens with positive refractive power and glass material; 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; 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 lenses, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, 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 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, and the first lens object side to the sixth lens image side has a distance of InTL on the optical axis. The optical imaging system has a maximum viewability Half of the angle is HAF, the horizontal distance between the coordinate point on the object side of the first lens at 1/2 HEP height and the imaging plane parallel to the optical axis is ETL, and the horizontal distance on the object side of the first lens at 1/2 HEP height To the coordinate point at 1/2 HEP height on the image side of the seventh lens The horizontal distance parallel to the optical axis is EIN, which meets the following conditions: 1≦f/HEP≦10; 0deg<HAF≦100deg; 0.5≦HOS/HOI≦1.6; 0.9≦InS/HOS≦1.1; and 0.2≦EIN /ETL<1. 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 object 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 horizontal distance between the coordinate point on the image side surface of the seventh lens at 1/2 HEP height and the imaging surface parallel to the optical axis is EBL, and the horizontal distance from the image side surface of the seventh lens The horizontal distance from the intersection with the optical axis to the imaging plane parallel to the optical axis is BL, which satisfies: 0.1≦EBL/BL<1.5. The optical imaging system according to claim 20, wherein the coordinate point on the image side surface of the sixth lens at 1/2 HEP height to the coordinate point on the object side surface of the seventh lens at 1/2 HEP height is parallel to the optical axis The horizontal distance is ED67, and the distance between the sixth lens and the seventh lens on the optical axis is IN67, which satisfies the following conditions: 0<ED67/IN67≦50. 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 is compatible with the lenses Coupling and displacement of these lenses.

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